1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/ext4/super.c 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/fs/minix/inode.c 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 * 16 * Big-endian to little-endian byte-swapping/bitmaps by 17 * David S. Miller (davem@caip.rutgers.edu), 1995 18 */ 19 20 #include <linux/module.h> 21 #include <linux/string.h> 22 #include <linux/fs.h> 23 #include <linux/time.h> 24 #include <linux/vmalloc.h> 25 #include <linux/slab.h> 26 #include <linux/init.h> 27 #include <linux/blkdev.h> 28 #include <linux/backing-dev.h> 29 #include <linux/parser.h> 30 #include <linux/buffer_head.h> 31 #include <linux/exportfs.h> 32 #include <linux/vfs.h> 33 #include <linux/random.h> 34 #include <linux/mount.h> 35 #include <linux/namei.h> 36 #include <linux/quotaops.h> 37 #include <linux/seq_file.h> 38 #include <linux/ctype.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 #include <linux/dax.h> 42 #include <linux/uaccess.h> 43 #include <linux/iversion.h> 44 #include <linux/unicode.h> 45 #include <linux/part_stat.h> 46 #include <linux/kthread.h> 47 #include <linux/freezer.h> 48 #include <linux/fsnotify.h> 49 #include <linux/fs_context.h> 50 #include <linux/fs_parser.h> 51 #include <linux/fserror.h> 52 53 #include "ext4.h" 54 #include "ext4_extents.h" /* Needed for trace points definition */ 55 #include "ext4_jbd2.h" 56 #include "xattr.h" 57 #include "acl.h" 58 #include "mballoc.h" 59 #include "fsmap.h" 60 61 #define CREATE_TRACE_POINTS 62 #include <trace/events/ext4.h> 63 64 static struct ext4_lazy_init *ext4_li_info; 65 static DEFINE_MUTEX(ext4_li_mtx); 66 static struct ratelimit_state ext4_mount_msg_ratelimit; 67 68 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 69 unsigned long journal_devnum); 70 static int ext4_show_options(struct seq_file *seq, struct dentry *root); 71 static void ext4_update_super(struct super_block *sb); 72 static int ext4_commit_super(struct super_block *sb); 73 static int ext4_mark_recovery_complete(struct super_block *sb, 74 struct ext4_super_block *es); 75 static int ext4_clear_journal_err(struct super_block *sb, 76 struct ext4_super_block *es); 77 static int ext4_sync_fs(struct super_block *sb, int wait); 78 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 79 static int ext4_unfreeze(struct super_block *sb); 80 static int ext4_freeze(struct super_block *sb); 81 static inline int ext2_feature_set_ok(struct super_block *sb); 82 static inline int ext3_feature_set_ok(struct super_block *sb); 83 static void ext4_unregister_li_request(struct super_block *sb); 84 static void ext4_clear_request_list(void); 85 static struct inode *ext4_get_journal_inode(struct super_block *sb, 86 unsigned int journal_inum); 87 static int ext4_validate_options(struct fs_context *fc); 88 static int ext4_check_opt_consistency(struct fs_context *fc, 89 struct super_block *sb); 90 static void ext4_apply_options(struct fs_context *fc, struct super_block *sb); 91 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param); 92 static int ext4_get_tree(struct fs_context *fc); 93 static int ext4_reconfigure(struct fs_context *fc); 94 static void ext4_fc_free(struct fs_context *fc); 95 static int ext4_init_fs_context(struct fs_context *fc); 96 static void ext4_kill_sb(struct super_block *sb); 97 static const struct fs_parameter_spec ext4_param_specs[]; 98 99 /* 100 * Lock ordering 101 * 102 * page fault path: 103 * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start 104 * -> page lock -> i_data_sem (rw) 105 * 106 * buffered write path: 107 * sb_start_write -> i_mutex -> mmap_lock 108 * sb_start_write -> i_mutex -> transaction start -> page lock -> 109 * i_data_sem (rw) 110 * 111 * truncate: 112 * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) -> 113 * page lock 114 * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start -> 115 * i_data_sem (rw) 116 * 117 * direct IO: 118 * sb_start_write -> i_mutex -> mmap_lock 119 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw) 120 * 121 * writepages: 122 * transaction start -> page lock(s) -> i_data_sem (rw) 123 */ 124 125 static const struct fs_context_operations ext4_context_ops = { 126 .parse_param = ext4_parse_param, 127 .get_tree = ext4_get_tree, 128 .reconfigure = ext4_reconfigure, 129 .free = ext4_fc_free, 130 }; 131 132 133 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 134 static struct file_system_type ext2_fs_type = { 135 .owner = THIS_MODULE, 136 .name = "ext2", 137 .init_fs_context = ext4_init_fs_context, 138 .parameters = ext4_param_specs, 139 .kill_sb = ext4_kill_sb, 140 .fs_flags = FS_REQUIRES_DEV, 141 }; 142 MODULE_ALIAS_FS("ext2"); 143 MODULE_ALIAS("ext2"); 144 #define IS_EXT2_SB(sb) ((sb)->s_type == &ext2_fs_type) 145 #else 146 #define IS_EXT2_SB(sb) (0) 147 #endif 148 149 150 static struct file_system_type ext3_fs_type = { 151 .owner = THIS_MODULE, 152 .name = "ext3", 153 .init_fs_context = ext4_init_fs_context, 154 .parameters = ext4_param_specs, 155 .kill_sb = ext4_kill_sb, 156 .fs_flags = FS_REQUIRES_DEV, 157 }; 158 MODULE_ALIAS_FS("ext3"); 159 MODULE_ALIAS("ext3"); 160 #define IS_EXT3_SB(sb) ((sb)->s_type == &ext3_fs_type) 161 162 163 static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 164 bio_end_io_t end_io, bool simu_fail) 165 { 166 if (simu_fail) { 167 clear_buffer_uptodate(bh); 168 unlock_buffer(bh); 169 return; 170 } 171 172 /* 173 * buffer's verified bit is no longer valid after reading from 174 * disk again due to write out error, clear it to make sure we 175 * recheck the buffer contents. 176 */ 177 clear_buffer_verified(bh); 178 179 if (!end_io) 180 end_io = bh_end_read; 181 bh_submit(bh, REQ_OP_READ | op_flags, end_io); 182 } 183 184 void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 185 bio_end_io_t end_io, bool simu_fail) 186 { 187 BUG_ON(!buffer_locked(bh)); 188 189 if (ext4_buffer_uptodate(bh)) { 190 unlock_buffer(bh); 191 return; 192 } 193 __ext4_read_bh(bh, op_flags, end_io, simu_fail); 194 } 195 196 int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 197 bio_end_io_t end_io, bool simu_fail) 198 { 199 BUG_ON(!buffer_locked(bh)); 200 201 if (ext4_buffer_uptodate(bh)) { 202 unlock_buffer(bh); 203 return 0; 204 } 205 206 __ext4_read_bh(bh, op_flags, end_io, simu_fail); 207 208 wait_on_buffer(bh); 209 if (buffer_uptodate(bh)) 210 return 0; 211 return -EIO; 212 } 213 214 int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait) 215 { 216 lock_buffer(bh); 217 if (!wait) { 218 ext4_read_bh_nowait(bh, op_flags, NULL, false); 219 return 0; 220 } 221 return ext4_read_bh(bh, op_flags, NULL, false); 222 } 223 224 /* 225 * This works like __bread_gfp() except it uses ERR_PTR for error 226 * returns. Currently with sb_bread it's impossible to distinguish 227 * between ENOMEM and EIO situations (since both result in a NULL 228 * return. 229 */ 230 static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb, 231 sector_t block, 232 blk_opf_t op_flags, gfp_t gfp) 233 { 234 struct buffer_head *bh; 235 int ret; 236 237 bh = sb_getblk_gfp(sb, block, gfp); 238 if (bh == NULL) 239 return ERR_PTR(-ENOMEM); 240 if (ext4_buffer_uptodate(bh)) 241 return bh; 242 243 ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true); 244 if (ret) { 245 put_bh(bh); 246 return ERR_PTR(ret); 247 } 248 return bh; 249 } 250 251 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block, 252 blk_opf_t op_flags) 253 { 254 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping, 255 ~__GFP_FS) | __GFP_MOVABLE; 256 257 return __ext4_sb_bread_gfp(sb, block, op_flags, gfp); 258 } 259 260 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 261 sector_t block) 262 { 263 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping, 264 ~__GFP_FS); 265 266 return __ext4_sb_bread_gfp(sb, block, 0, gfp); 267 } 268 269 struct buffer_head *ext4_sb_bread_nofail(struct super_block *sb, 270 sector_t block) 271 { 272 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping, 273 ~__GFP_FS) | __GFP_MOVABLE | __GFP_NOFAIL; 274 275 return __ext4_sb_bread_gfp(sb, block, 0, gfp); 276 } 277 278 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block) 279 { 280 struct buffer_head *bh = bdev_getblk(sb->s_bdev, block, 281 sb->s_blocksize, GFP_NOWAIT); 282 283 if (likely(bh)) { 284 if (trylock_buffer(bh)) 285 ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL, false); 286 brelse(bh); 287 } 288 } 289 290 static int ext4_verify_csum_type(struct super_block *sb, 291 struct ext4_super_block *es) 292 { 293 if (!ext4_has_feature_metadata_csum(sb)) 294 return 1; 295 296 return es->s_checksum_type == EXT4_CRC32C_CHKSUM; 297 } 298 299 __le32 ext4_superblock_csum(struct ext4_super_block *es) 300 { 301 int offset = offsetof(struct ext4_super_block, s_checksum); 302 __u32 csum; 303 304 csum = ext4_chksum(~0, (char *)es, offset); 305 306 return cpu_to_le32(csum); 307 } 308 309 static int ext4_superblock_csum_verify(struct super_block *sb, 310 struct ext4_super_block *es) 311 { 312 if (!ext4_has_feature_metadata_csum(sb)) 313 return 1; 314 315 return es->s_checksum == ext4_superblock_csum(es); 316 } 317 318 void ext4_superblock_csum_set(struct super_block *sb) 319 { 320 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 321 322 if (!ext4_has_feature_metadata_csum(sb)) 323 return; 324 325 es->s_checksum = ext4_superblock_csum(es); 326 } 327 328 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 329 struct ext4_group_desc *bg) 330 { 331 return le32_to_cpu(bg->bg_block_bitmap_lo) | 332 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 333 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 334 } 335 336 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 337 struct ext4_group_desc *bg) 338 { 339 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 340 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 341 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 342 } 343 344 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 345 struct ext4_group_desc *bg) 346 { 347 return le32_to_cpu(bg->bg_inode_table_lo) | 348 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 349 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 350 } 351 352 __u32 ext4_free_group_clusters(struct super_block *sb, 353 struct ext4_group_desc *bg) 354 { 355 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 356 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 357 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 358 } 359 360 __u32 ext4_free_inodes_count(struct super_block *sb, 361 struct ext4_group_desc *bg) 362 { 363 return le16_to_cpu(READ_ONCE(bg->bg_free_inodes_count_lo)) | 364 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 365 (__u32)le16_to_cpu(READ_ONCE(bg->bg_free_inodes_count_hi)) << 16 : 0); 366 } 367 368 __u32 ext4_used_dirs_count(struct super_block *sb, 369 struct ext4_group_desc *bg) 370 { 371 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 372 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 373 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 374 } 375 376 __u32 ext4_itable_unused_count(struct super_block *sb, 377 struct ext4_group_desc *bg) 378 { 379 return le16_to_cpu(bg->bg_itable_unused_lo) | 380 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 381 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 382 } 383 384 void ext4_block_bitmap_set(struct super_block *sb, 385 struct ext4_group_desc *bg, ext4_fsblk_t blk) 386 { 387 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 388 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 389 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 390 } 391 392 void ext4_inode_bitmap_set(struct super_block *sb, 393 struct ext4_group_desc *bg, ext4_fsblk_t blk) 394 { 395 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 396 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 397 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 398 } 399 400 void ext4_inode_table_set(struct super_block *sb, 401 struct ext4_group_desc *bg, ext4_fsblk_t blk) 402 { 403 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 404 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 405 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 406 } 407 408 void ext4_free_group_clusters_set(struct super_block *sb, 409 struct ext4_group_desc *bg, __u32 count) 410 { 411 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 412 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 413 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 414 } 415 416 void ext4_free_inodes_set(struct super_block *sb, 417 struct ext4_group_desc *bg, __u32 count) 418 { 419 WRITE_ONCE(bg->bg_free_inodes_count_lo, cpu_to_le16((__u16)count)); 420 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 421 WRITE_ONCE(bg->bg_free_inodes_count_hi, cpu_to_le16(count >> 16)); 422 } 423 424 void ext4_used_dirs_set(struct super_block *sb, 425 struct ext4_group_desc *bg, __u32 count) 426 { 427 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 428 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 429 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 430 } 431 432 void ext4_itable_unused_set(struct super_block *sb, 433 struct ext4_group_desc *bg, __u32 count) 434 { 435 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 436 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 437 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 438 } 439 440 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now) 441 { 442 now = clamp_val(now, 0, (1ull << 40) - 1); 443 444 *lo = cpu_to_le32(lower_32_bits(now)); 445 *hi = upper_32_bits(now); 446 } 447 448 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi) 449 { 450 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo); 451 } 452 #define ext4_update_tstamp(es, tstamp) \ 453 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \ 454 ktime_get_real_seconds()) 455 #define ext4_get_tstamp(es, tstamp) \ 456 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi) 457 458 /* 459 * The ext4_maybe_update_superblock() function checks and updates the 460 * superblock if needed. 461 * 462 * This function is designed to update the on-disk superblock only under 463 * certain conditions to prevent excessive disk writes and unnecessary 464 * waking of the disk from sleep. The superblock will be updated if: 465 * 1. More than sbi->s_sb_update_sec (def: 1 hour) has passed since the last 466 * superblock update 467 * 2. More than sbi->s_sb_update_kb (def: 16MB) kbs have been written since the 468 * last superblock update. 469 * 470 * @sb: The superblock 471 */ 472 static void ext4_maybe_update_superblock(struct super_block *sb) 473 { 474 struct ext4_sb_info *sbi = EXT4_SB(sb); 475 struct ext4_super_block *es = sbi->s_es; 476 journal_t *journal = sbi->s_journal; 477 time64_t now; 478 __u64 last_update; 479 __u64 lifetime_write_kbytes; 480 __u64 diff_size; 481 482 if (ext4_emergency_state(sb) || sb_rdonly(sb) || 483 !(sb->s_flags & SB_ACTIVE) || !journal || 484 journal->j_flags & JBD2_UNMOUNT) 485 return; 486 487 now = ktime_get_real_seconds(); 488 last_update = ext4_get_tstamp(es, s_wtime); 489 490 if (likely(now - last_update < sbi->s_sb_update_sec)) 491 return; 492 493 lifetime_write_kbytes = sbi->s_kbytes_written + 494 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 495 sbi->s_sectors_written_start) >> 1); 496 497 /* Get the number of kilobytes not written to disk to account 498 * for statistics and compare with a multiple of 16 MB. This 499 * is used to determine when the next superblock commit should 500 * occur (i.e. not more often than once per 16MB if there was 501 * less written in an hour). 502 */ 503 diff_size = lifetime_write_kbytes - le64_to_cpu(es->s_kbytes_written); 504 505 if (diff_size > sbi->s_sb_update_kb) 506 schedule_work(&EXT4_SB(sb)->s_sb_upd_work); 507 } 508 509 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 510 { 511 struct super_block *sb = journal->j_private; 512 513 BUG_ON(txn->t_state == T_FINISHED); 514 515 ext4_process_freed_data(sb, txn->t_tid); 516 ext4_maybe_update_superblock(sb); 517 } 518 519 static bool ext4_journalled_writepage_needs_redirty(struct jbd2_inode *jinode, 520 struct folio *folio) 521 { 522 struct buffer_head *bh, *head; 523 struct journal_head *jh; 524 transaction_t *trans = READ_ONCE(jinode->i_transaction); 525 526 bh = head = folio_buffers(folio); 527 do { 528 /* 529 * We have to redirty a page in these cases: 530 * 1) If buffer is dirty, it means the page was dirty because it 531 * contains a buffer that needs checkpointing. So the dirty bit 532 * needs to be preserved so that checkpointing writes the buffer 533 * properly. 534 * 2) If buffer is not part of the committing transaction 535 * (we may have just accidentally come across this buffer because 536 * inode range tracking is not exact) or if the currently running 537 * transaction already contains this buffer as well, dirty bit 538 * needs to be preserved so that the buffer gets writeprotected 539 * properly on running transaction's commit. 540 */ 541 jh = bh2jh(bh); 542 if (buffer_dirty(bh) || 543 (jh && (jh->b_transaction != trans || 544 jh->b_next_transaction))) 545 return true; 546 } while ((bh = bh->b_this_page) != head); 547 548 return false; 549 } 550 551 static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode) 552 { 553 struct address_space *mapping = jinode->i_vfs_inode->i_mapping; 554 loff_t range_start, range_end; 555 struct writeback_control wbc = { 556 .sync_mode = WB_SYNC_ALL, 557 .nr_to_write = LONG_MAX, 558 }; 559 struct folio *folio = NULL; 560 int error; 561 562 if (!jbd2_jinode_get_dirty_range(jinode, &range_start, &range_end)) 563 return 0; 564 565 wbc.range_start = range_start; 566 wbc.range_end = range_end; 567 568 /* 569 * writeback_iter() already checks for dirty pages and calls 570 * folio_clear_dirty_for_io(), which we want to write protect the 571 * folios. 572 * 573 * However, we may have to redirty a folio sometimes. 574 */ 575 while ((folio = writeback_iter(mapping, &wbc, folio, &error))) { 576 if (ext4_journalled_writepage_needs_redirty(jinode, folio)) 577 folio_redirty_for_writepage(&wbc, folio); 578 folio_unlock(folio); 579 } 580 581 return error; 582 } 583 584 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode) 585 { 586 int ret; 587 588 if (ext4_should_journal_data(jinode->i_vfs_inode)) 589 ret = ext4_journalled_submit_inode_data_buffers(jinode); 590 else 591 ret = ext4_normal_submit_inode_data_buffers(jinode); 592 return ret; 593 } 594 595 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode) 596 { 597 int ret = 0; 598 599 if (!ext4_should_journal_data(jinode->i_vfs_inode)) 600 ret = jbd2_journal_finish_inode_data_buffers(jinode); 601 602 return ret; 603 } 604 605 static bool system_going_down(void) 606 { 607 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF 608 || system_state == SYSTEM_RESTART; 609 } 610 611 struct ext4_err_translation { 612 int code; 613 int errno; 614 }; 615 616 #define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err } 617 618 static struct ext4_err_translation err_translation[] = { 619 EXT4_ERR_TRANSLATE(EIO), 620 EXT4_ERR_TRANSLATE(ENOMEM), 621 EXT4_ERR_TRANSLATE(EFSBADCRC), 622 EXT4_ERR_TRANSLATE(EFSCORRUPTED), 623 EXT4_ERR_TRANSLATE(ENOSPC), 624 EXT4_ERR_TRANSLATE(ENOKEY), 625 EXT4_ERR_TRANSLATE(EROFS), 626 EXT4_ERR_TRANSLATE(EFBIG), 627 EXT4_ERR_TRANSLATE(EEXIST), 628 EXT4_ERR_TRANSLATE(ERANGE), 629 EXT4_ERR_TRANSLATE(EOVERFLOW), 630 EXT4_ERR_TRANSLATE(EBUSY), 631 EXT4_ERR_TRANSLATE(ENOTDIR), 632 EXT4_ERR_TRANSLATE(ENOTEMPTY), 633 EXT4_ERR_TRANSLATE(ESHUTDOWN), 634 EXT4_ERR_TRANSLATE(EFAULT), 635 }; 636 637 static int ext4_errno_to_code(int errno) 638 { 639 int i; 640 641 for (i = 0; i < ARRAY_SIZE(err_translation); i++) 642 if (err_translation[i].errno == errno) 643 return err_translation[i].code; 644 return EXT4_ERR_UNKNOWN; 645 } 646 647 static void save_error_info(struct super_block *sb, int error, 648 __u32 ino, __u64 block, 649 const char *func, unsigned int line) 650 { 651 struct ext4_sb_info *sbi = EXT4_SB(sb); 652 653 /* We default to EFSCORRUPTED error... */ 654 if (error == 0) 655 error = EFSCORRUPTED; 656 657 spin_lock(&sbi->s_error_lock); 658 sbi->s_add_error_count++; 659 sbi->s_last_error_code = error; 660 sbi->s_last_error_line = line; 661 sbi->s_last_error_ino = ino; 662 sbi->s_last_error_block = block; 663 sbi->s_last_error_func = func; 664 sbi->s_last_error_time = ktime_get_real_seconds(); 665 if (!sbi->s_first_error_time) { 666 sbi->s_first_error_code = error; 667 sbi->s_first_error_line = line; 668 sbi->s_first_error_ino = ino; 669 sbi->s_first_error_block = block; 670 sbi->s_first_error_func = func; 671 sbi->s_first_error_time = sbi->s_last_error_time; 672 } 673 spin_unlock(&sbi->s_error_lock); 674 } 675 676 /* Deal with the reporting of failure conditions on a filesystem such as 677 * inconsistencies detected or read IO failures. 678 * 679 * On ext2, we can store the error state of the filesystem in the 680 * superblock. That is not possible on ext4, because we may have other 681 * write ordering constraints on the superblock which prevent us from 682 * writing it out straight away; and given that the journal is about to 683 * be aborted, we can't rely on the current, or future, transactions to 684 * write out the superblock safely. 685 * 686 * We'll just use the jbd2_journal_abort() error code to record an error in 687 * the journal instead. On recovery, the journal will complain about 688 * that error until we've noted it down and cleared it. 689 * 690 * If force_ro is set, we unconditionally force the filesystem into an 691 * ABORT|READONLY state, unless the error response on the fs has been set to 692 * panic in which case we take the easy way out and panic immediately. This is 693 * used to deal with unrecoverable failures such as journal IO errors or ENOMEM 694 * at a critical moment in log management. 695 */ 696 static void ext4_handle_error(struct super_block *sb, bool force_ro, int error, 697 __u32 ino, __u64 block, 698 const char *func, unsigned int line) 699 { 700 journal_t *journal = EXT4_SB(sb)->s_journal; 701 bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT); 702 703 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 704 if (test_opt(sb, WARN_ON_ERROR)) 705 WARN_ON_ONCE(1); 706 707 if (!continue_fs && !ext4_emergency_ro(sb) && journal) 708 jbd2_journal_abort(journal, -error); 709 710 if (!bdev_read_only(sb->s_bdev)) { 711 save_error_info(sb, error, ino, block, func, line); 712 /* 713 * In case the fs should keep running, we need to writeout 714 * superblock through the journal. Due to lock ordering 715 * constraints, it may not be safe to do it right here so we 716 * defer superblock flushing to a workqueue. We just need to be 717 * careful when the journal is already shutting down. If we get 718 * here in that case, just update the sb directly as the last 719 * transaction won't commit anyway. 720 */ 721 if (continue_fs && journal && 722 !ext4_test_mount_flag(sb, EXT4_MF_JOURNAL_DESTROY)) 723 schedule_work(&EXT4_SB(sb)->s_sb_upd_work); 724 else 725 ext4_commit_super(sb); 726 } 727 728 /* 729 * We force ERRORS_RO behavior when system is rebooting. Otherwise we 730 * could panic during 'reboot -f' as the underlying device got already 731 * disabled. 732 */ 733 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) { 734 panic("EXT4-fs (device %s): panic forced after error\n", 735 sb->s_id); 736 } 737 738 if (ext4_emergency_ro(sb) || continue_fs) 739 return; 740 741 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 742 /* 743 * We don't set SB_RDONLY because that requires sb->s_umount 744 * semaphore and setting it without proper remount procedure is 745 * confusing code such as freeze_super() leading to deadlocks 746 * and other problems. 747 */ 748 set_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags); 749 } 750 751 static void update_super_work(struct work_struct *work) 752 { 753 struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info, 754 s_sb_upd_work); 755 journal_t *journal = sbi->s_journal; 756 handle_t *handle; 757 758 /* 759 * If the journal is still running, we have to write out superblock 760 * through the journal to avoid collisions of other journalled sb 761 * updates. 762 * 763 * We use directly jbd2 functions here to avoid recursing back into 764 * ext4 error handling code during handling of previous errors. 765 */ 766 if (!ext4_emergency_state(sbi->s_sb) && 767 !sb_rdonly(sbi->s_sb) && journal) { 768 struct buffer_head *sbh = sbi->s_sbh; 769 bool call_notify_err = false; 770 771 handle = jbd2_journal_start(journal, 1); 772 if (IS_ERR(handle)) 773 goto write_directly; 774 if (jbd2_journal_get_write_access(handle, sbh)) { 775 jbd2_journal_stop(handle); 776 goto write_directly; 777 } 778 779 if (sbi->s_add_error_count > 0) 780 call_notify_err = true; 781 782 ext4_update_super(sbi->s_sb); 783 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) { 784 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to " 785 "superblock detected"); 786 clear_buffer_write_io_error(sbh); 787 set_buffer_uptodate(sbh); 788 } 789 790 if (jbd2_journal_dirty_metadata(handle, sbh)) { 791 jbd2_journal_stop(handle); 792 goto write_directly; 793 } 794 jbd2_journal_stop(handle); 795 796 if (call_notify_err) 797 ext4_notify_error_sysfs(sbi); 798 799 return; 800 } 801 write_directly: 802 /* 803 * Write through journal failed. Write sb directly to get error info 804 * out and hope for the best. 805 */ 806 ext4_commit_super(sbi->s_sb); 807 ext4_notify_error_sysfs(sbi); 808 } 809 810 #define ext4_error_ratelimit(sb) \ 811 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ 812 "EXT4-fs error") 813 814 void __ext4_error(struct super_block *sb, const char *function, 815 unsigned int line, bool force_ro, int error, __u64 block, 816 const char *fmt, ...) 817 { 818 struct va_format vaf; 819 va_list args; 820 821 if (unlikely(ext4_emergency_state(sb))) 822 return; 823 824 trace_ext4_error(sb, function, line); 825 if (ext4_error_ratelimit(sb)) { 826 va_start(args, fmt); 827 vaf.fmt = fmt; 828 vaf.va = &args; 829 printk(KERN_CRIT 830 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 831 sb->s_id, function, line, current->comm, &vaf); 832 va_end(args); 833 } 834 fserror_report_metadata(sb, error ? -abs(error) : -EFSCORRUPTED, 835 GFP_ATOMIC); 836 837 ext4_handle_error(sb, force_ro, error, 0, block, function, line); 838 } 839 840 void __ext4_error_inode(struct inode *inode, const char *function, 841 unsigned int line, ext4_fsblk_t block, int error, 842 const char *fmt, ...) 843 { 844 va_list args; 845 struct va_format vaf; 846 847 if (unlikely(ext4_emergency_state(inode->i_sb))) 848 return; 849 850 trace_ext4_error(inode->i_sb, function, line); 851 if (ext4_error_ratelimit(inode->i_sb)) { 852 va_start(args, fmt); 853 vaf.fmt = fmt; 854 vaf.va = &args; 855 if (block) 856 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 857 "inode #%llu: block %llu: comm %s: %pV\n", 858 inode->i_sb->s_id, function, line, inode->i_ino, 859 block, current->comm, &vaf); 860 else 861 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 862 "inode #%llu: comm %s: %pV\n", 863 inode->i_sb->s_id, function, line, inode->i_ino, 864 current->comm, &vaf); 865 va_end(args); 866 } 867 fserror_report_file_metadata(inode, 868 error ? -abs(error) : -EFSCORRUPTED, 869 GFP_ATOMIC); 870 871 ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block, 872 function, line); 873 } 874 875 void __ext4_error_file(struct file *file, const char *function, 876 unsigned int line, ext4_fsblk_t block, 877 const char *fmt, ...) 878 { 879 va_list args; 880 struct va_format vaf; 881 struct inode *inode = file_inode(file); 882 char pathname[80], *path; 883 884 if (unlikely(ext4_emergency_state(inode->i_sb))) 885 return; 886 887 trace_ext4_error(inode->i_sb, function, line); 888 if (ext4_error_ratelimit(inode->i_sb)) { 889 path = file_path(file, pathname, sizeof(pathname)); 890 if (IS_ERR(path)) 891 path = "(unknown)"; 892 va_start(args, fmt); 893 vaf.fmt = fmt; 894 vaf.va = &args; 895 if (block) 896 printk(KERN_CRIT 897 "EXT4-fs error (device %s): %s:%d: inode #%llu: " 898 "block %llu: comm %s: path %s: %pV\n", 899 inode->i_sb->s_id, function, line, inode->i_ino, 900 block, current->comm, path, &vaf); 901 else 902 printk(KERN_CRIT 903 "EXT4-fs error (device %s): %s:%d: inode #%llu: " 904 "comm %s: path %s: %pV\n", 905 inode->i_sb->s_id, function, line, inode->i_ino, 906 current->comm, path, &vaf); 907 va_end(args); 908 } 909 fserror_report_file_metadata(inode, -EFSCORRUPTED, GFP_ATOMIC); 910 911 ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block, 912 function, line); 913 } 914 915 const char *ext4_decode_error(struct super_block *sb, int errno, 916 char nbuf[16]) 917 { 918 char *errstr = NULL; 919 920 switch (errno) { 921 case -EFSCORRUPTED: 922 errstr = "Corrupt filesystem"; 923 break; 924 case -EFSBADCRC: 925 errstr = "Filesystem failed CRC"; 926 break; 927 case -EIO: 928 errstr = "IO failure"; 929 break; 930 case -ENOMEM: 931 errstr = "Out of memory"; 932 break; 933 case -EROFS: 934 if (!sb || (EXT4_SB(sb)->s_journal && 935 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 936 errstr = "Journal has aborted"; 937 else 938 errstr = "Readonly filesystem"; 939 break; 940 default: 941 /* If the caller passed in an extra buffer for unknown 942 * errors, textualise them now. Else we just return 943 * NULL. */ 944 if (nbuf) { 945 /* Check for truncated error codes... */ 946 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 947 errstr = nbuf; 948 } 949 break; 950 } 951 952 return errstr; 953 } 954 955 /* __ext4_std_error decodes expected errors from journaling functions 956 * automatically and invokes the appropriate error response. */ 957 958 void __ext4_std_error(struct super_block *sb, const char *function, 959 unsigned int line, int errno) 960 { 961 char nbuf[16]; 962 const char *errstr; 963 964 if (unlikely(ext4_emergency_state(sb))) 965 return; 966 967 /* Special case: if the error is EROFS, and we're not already 968 * inside a transaction, then there's really no point in logging 969 * an error. */ 970 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb)) 971 return; 972 973 if (ext4_error_ratelimit(sb)) { 974 errstr = ext4_decode_error(sb, errno, nbuf); 975 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 976 sb->s_id, function, line, errstr); 977 } 978 fserror_report_metadata(sb, errno ? -abs(errno) : -EFSCORRUPTED, 979 GFP_ATOMIC); 980 981 ext4_handle_error(sb, false, -errno, 0, 0, function, line); 982 } 983 984 void __ext4_msg(struct super_block *sb, 985 const char *prefix, const char *fmt, ...) 986 { 987 struct va_format vaf; 988 va_list args; 989 990 if (sb) { 991 atomic_inc(&EXT4_SB(sb)->s_msg_count); 992 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), 993 "EXT4-fs")) 994 return; 995 } 996 997 va_start(args, fmt); 998 vaf.fmt = fmt; 999 vaf.va = &args; 1000 if (sb) 1001 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 1002 else 1003 printk("%sEXT4-fs: %pV\n", prefix, &vaf); 1004 va_end(args); 1005 } 1006 1007 static int ext4_warning_ratelimit(struct super_block *sb) 1008 { 1009 atomic_inc(&EXT4_SB(sb)->s_warning_count); 1010 return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), 1011 "EXT4-fs warning"); 1012 } 1013 1014 void __ext4_warning(struct super_block *sb, const char *function, 1015 unsigned int line, const char *fmt, ...) 1016 { 1017 struct va_format vaf; 1018 va_list args; 1019 1020 if (!ext4_warning_ratelimit(sb)) 1021 return; 1022 1023 va_start(args, fmt); 1024 vaf.fmt = fmt; 1025 vaf.va = &args; 1026 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 1027 sb->s_id, function, line, &vaf); 1028 va_end(args); 1029 } 1030 1031 void __ext4_warning_inode(const struct inode *inode, const char *function, 1032 unsigned int line, const char *fmt, ...) 1033 { 1034 struct va_format vaf; 1035 va_list args; 1036 1037 if (!ext4_warning_ratelimit(inode->i_sb)) 1038 return; 1039 1040 va_start(args, fmt); 1041 vaf.fmt = fmt; 1042 vaf.va = &args; 1043 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " 1044 "inode #%llu: comm %s: %pV\n", inode->i_sb->s_id, 1045 function, line, inode->i_ino, current->comm, &vaf); 1046 va_end(args); 1047 } 1048 1049 void __ext4_grp_locked_error(const char *function, unsigned int line, 1050 struct super_block *sb, ext4_group_t grp, 1051 u64 ino, ext4_fsblk_t block, 1052 const char *fmt, ...) 1053 __releases(bitlock) 1054 __acquires(bitlock) 1055 { 1056 struct va_format vaf; 1057 va_list args; 1058 1059 if (unlikely(ext4_emergency_state(sb))) 1060 return; 1061 1062 trace_ext4_error(sb, function, line); 1063 if (ext4_error_ratelimit(sb)) { 1064 va_start(args, fmt); 1065 vaf.fmt = fmt; 1066 vaf.va = &args; 1067 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 1068 sb->s_id, function, line, grp); 1069 if (ino) 1070 printk(KERN_CONT "inode %llu: ", ino); 1071 if (block) 1072 printk(KERN_CONT "block %llu:", 1073 (unsigned long long) block); 1074 printk(KERN_CONT "%pV\n", &vaf); 1075 va_end(args); 1076 } 1077 1078 if (test_opt(sb, ERRORS_CONT)) { 1079 if (test_opt(sb, WARN_ON_ERROR)) 1080 WARN_ON_ONCE(1); 1081 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 1082 if (!bdev_read_only(sb->s_bdev)) { 1083 save_error_info(sb, EFSCORRUPTED, ino, block, function, 1084 line); 1085 schedule_work(&EXT4_SB(sb)->s_sb_upd_work); 1086 } 1087 return; 1088 } 1089 ext4_unlock_group(sb, grp); 1090 ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line); 1091 /* 1092 * We only get here in the ERRORS_RO case; relocking the group 1093 * may be dangerous, but nothing bad will happen since the 1094 * filesystem will have already been marked read/only and the 1095 * journal has been aborted. We return 1 as a hint to callers 1096 * who might what to use the return value from 1097 * ext4_grp_locked_error() to distinguish between the 1098 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 1099 * aggressively from the ext4 function in question, with a 1100 * more appropriate error code. 1101 */ 1102 ext4_lock_group(sb, grp); 1103 return; 1104 } 1105 1106 void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 1107 ext4_group_t group, 1108 unsigned int flags) 1109 { 1110 struct ext4_sb_info *sbi = EXT4_SB(sb); 1111 struct ext4_group_info *grp = ext4_get_group_info(sb, group); 1112 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL); 1113 int ret; 1114 1115 if (!grp || !gdp) 1116 return; 1117 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) { 1118 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, 1119 &grp->bb_state); 1120 if (!ret) 1121 percpu_counter_sub(&sbi->s_freeclusters_counter, 1122 grp->bb_free); 1123 } 1124 1125 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) { 1126 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, 1127 &grp->bb_state); 1128 if (!ret && gdp) { 1129 int count; 1130 1131 count = ext4_free_inodes_count(sb, gdp); 1132 percpu_counter_sub(&sbi->s_freeinodes_counter, 1133 count); 1134 } 1135 } 1136 } 1137 1138 void ext4_update_dynamic_rev(struct super_block *sb) 1139 { 1140 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 1141 1142 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 1143 return; 1144 1145 ext4_warning(sb, 1146 "updating to rev %d because of new feature flag, " 1147 "running e2fsck is recommended", 1148 EXT4_DYNAMIC_REV); 1149 1150 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 1151 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 1152 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 1153 /* leave es->s_feature_*compat flags alone */ 1154 /* es->s_uuid will be set by e2fsck if empty */ 1155 1156 /* 1157 * The rest of the superblock fields should be zero, and if not it 1158 * means they are likely already in use, so leave them alone. We 1159 * can leave it up to e2fsck to clean up any inconsistencies there. 1160 */ 1161 } 1162 1163 static inline struct inode *orphan_list_entry(struct list_head *l) 1164 { 1165 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 1166 } 1167 1168 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 1169 { 1170 struct list_head *l; 1171 1172 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 1173 le32_to_cpu(sbi->s_es->s_last_orphan)); 1174 1175 printk(KERN_ERR "sb_info orphan list:\n"); 1176 list_for_each(l, &sbi->s_orphan) { 1177 struct inode *inode = orphan_list_entry(l); 1178 printk(KERN_ERR " " 1179 "inode %s:%llu at %p: mode %o, nlink %d, next %d\n", 1180 inode->i_sb->s_id, inode->i_ino, inode, 1181 inode->i_mode, inode->i_nlink, 1182 NEXT_ORPHAN(inode)); 1183 } 1184 } 1185 1186 #ifdef CONFIG_QUOTA 1187 static int ext4_quota_off(struct super_block *sb, int type); 1188 1189 static inline void ext4_quotas_off(struct super_block *sb, int type) 1190 { 1191 BUG_ON(type > EXT4_MAXQUOTAS); 1192 1193 /* Use our quota_off function to clear inode flags etc. */ 1194 for (type--; type >= 0; type--) 1195 ext4_quota_off(sb, type); 1196 } 1197 1198 /* 1199 * This is a helper function which is used in the mount/remount 1200 * codepaths (which holds s_umount) to fetch the quota file name. 1201 */ 1202 static inline char *get_qf_name(struct super_block *sb, 1203 struct ext4_sb_info *sbi, 1204 int type) 1205 { 1206 return rcu_dereference_protected(sbi->s_qf_names[type], 1207 lockdep_is_held(&sb->s_umount)); 1208 } 1209 #else 1210 static inline void ext4_quotas_off(struct super_block *sb, int type) 1211 { 1212 } 1213 #endif 1214 1215 static int ext4_percpu_param_init(struct ext4_sb_info *sbi) 1216 { 1217 ext4_fsblk_t block; 1218 int err; 1219 1220 block = ext4_count_free_clusters(sbi->s_sb); 1221 ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block)); 1222 err = percpu_counter_init(&sbi->s_freeclusters_counter, block, 1223 GFP_KERNEL); 1224 if (!err) { 1225 unsigned long freei = ext4_count_free_inodes(sbi->s_sb); 1226 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); 1227 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, 1228 GFP_KERNEL); 1229 } 1230 if (!err) 1231 err = percpu_counter_init(&sbi->s_dirs_counter, 1232 ext4_count_dirs(sbi->s_sb), GFP_KERNEL); 1233 if (!err) 1234 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, 1235 GFP_KERNEL); 1236 if (!err) 1237 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0, 1238 GFP_KERNEL); 1239 if (!err) 1240 err = percpu_init_rwsem(&sbi->s_writepages_rwsem); 1241 1242 if (err) 1243 ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory"); 1244 1245 return err; 1246 } 1247 1248 static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi) 1249 { 1250 percpu_counter_destroy(&sbi->s_freeclusters_counter); 1251 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1252 percpu_counter_destroy(&sbi->s_dirs_counter); 1253 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 1254 percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit); 1255 percpu_free_rwsem(&sbi->s_writepages_rwsem); 1256 } 1257 1258 static void ext4_group_desc_free(struct ext4_sb_info *sbi) 1259 { 1260 struct buffer_head **group_desc; 1261 int i; 1262 1263 group_desc = rcu_access_pointer(sbi->s_group_desc); 1264 for (i = 0; i < sbi->s_gdb_count; i++) 1265 brelse(group_desc[i]); 1266 kvfree(group_desc); 1267 } 1268 1269 static void ext4_flex_groups_free(struct ext4_sb_info *sbi) 1270 { 1271 struct flex_groups **flex_groups; 1272 int i; 1273 1274 flex_groups = rcu_access_pointer(sbi->s_flex_groups); 1275 if (flex_groups) { 1276 for (i = 0; i < sbi->s_flex_groups_allocated; i++) 1277 kvfree(flex_groups[i]); 1278 kvfree(flex_groups); 1279 } 1280 } 1281 1282 static void ext4_put_sbi_rcu(struct rcu_head *head) 1283 { 1284 struct ext4_sb_info *sbi = container_of(head, struct ext4_sb_info, s_rcu); 1285 1286 ext4_es_destroy_stats(sbi); 1287 kfree(sbi); 1288 } 1289 1290 static void ext4_put_super(struct super_block *sb) 1291 { 1292 struct ext4_sb_info *sbi = EXT4_SB(sb); 1293 struct ext4_super_block *es = sbi->s_es; 1294 int aborted = 0; 1295 int err; 1296 1297 /* 1298 * Unregister sysfs before destroying jbd2 journal. 1299 * Since we could still access attr_journal_task attribute via sysfs 1300 * path which could have sbi->s_journal->j_task as NULL 1301 * Unregister sysfs before flush sbi->s_sb_upd_work. 1302 * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If 1303 * read metadata verify failed then will queue error work. 1304 * update_super_work will call start_this_handle may trigger 1305 * BUG_ON. 1306 */ 1307 ext4_unregister_sysfs(sb); 1308 1309 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount")) 1310 ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.", 1311 &sb->s_uuid); 1312 1313 ext4_unregister_li_request(sb); 1314 /* Drain deferred EA inode iputs while quota is still active. */ 1315 flush_delayed_work(&sbi->s_ea_inode_work); 1316 ext4_quotas_off(sb, EXT4_MAXQUOTAS); 1317 1318 destroy_workqueue(sbi->rsv_conversion_wq); 1319 ext4_release_orphan_info(sb); 1320 1321 if (sbi->s_journal) { 1322 aborted = is_journal_aborted(sbi->s_journal); 1323 err = ext4_journal_destroy(sbi, sbi->s_journal); 1324 if ((err < 0) && !aborted) { 1325 ext4_abort(sb, -err, "Couldn't clean up the journal"); 1326 } 1327 } else 1328 flush_work(&sbi->s_sb_upd_work); 1329 1330 ext4_es_unregister_shrinker(sbi); 1331 timer_shutdown_sync(&sbi->s_err_report); 1332 ext4_release_system_zone(sb); 1333 ext4_mb_release(sb); 1334 ext4_ext_release(sb); 1335 1336 if (!ext4_emergency_state(sb) && !sb_rdonly(sb)) { 1337 if (!aborted) { 1338 ext4_clear_feature_journal_needs_recovery(sb); 1339 ext4_clear_feature_orphan_present(sb); 1340 es->s_state = cpu_to_le16(sbi->s_mount_state); 1341 } 1342 ext4_commit_super(sb); 1343 } 1344 1345 ext4_group_desc_free(sbi); 1346 ext4_flex_groups_free(sbi); 1347 1348 WARN_ON_ONCE(!(sbi->s_mount_state & EXT4_ERROR_FS) && 1349 percpu_counter_sum(&sbi->s_dirtyclusters_counter)); 1350 ext4_percpu_param_destroy(sbi); 1351 #ifdef CONFIG_QUOTA 1352 for (int i = 0; i < EXT4_MAXQUOTAS; i++) 1353 kfree(get_qf_name(sb, sbi, i)); 1354 #endif 1355 1356 /* Debugging code just in case the in-memory inode orphan list 1357 * isn't empty. The on-disk one can be non-empty if we've 1358 * detected an error and taken the fs readonly, but the 1359 * in-memory list had better be clean by this point. */ 1360 if (!list_empty(&sbi->s_orphan)) 1361 dump_orphan_list(sb, sbi); 1362 ASSERT(list_empty(&sbi->s_orphan)); 1363 1364 sync_blockdev(sb->s_bdev); 1365 invalidate_bdev(sb->s_bdev); 1366 if (sbi->s_journal_bdev_file) { 1367 /* 1368 * Invalidate the journal device's buffers. We don't want them 1369 * floating about in memory - the physical journal device may 1370 * hotswapped, and it breaks the `ro-after' testing code. 1371 */ 1372 sync_blockdev(file_bdev(sbi->s_journal_bdev_file)); 1373 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file)); 1374 } 1375 1376 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); 1377 sbi->s_ea_inode_cache = NULL; 1378 1379 ext4_xattr_destroy_cache(sbi->s_ea_block_cache); 1380 sbi->s_ea_block_cache = NULL; 1381 1382 ext4_stop_mmpd(sbi); 1383 1384 brelse(sbi->s_sbh); 1385 /* 1386 * Now that we are completely done shutting down the 1387 * superblock, we need to actually destroy the kobject. 1388 */ 1389 kobject_put(&sbi->s_kobj); 1390 wait_for_completion(&sbi->s_kobj_unregister); 1391 kfree(sbi->s_blockgroup_lock); 1392 fs_put_dax(sbi->s_daxdev, NULL); 1393 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy); 1394 #if IS_ENABLED(CONFIG_UNICODE) 1395 utf8_unload(sb->s_encoding); 1396 #endif 1397 /* ext4_get_link() reads the sbi and the counters in rcu pathwalk */ 1398 call_rcu(&sbi->s_rcu, ext4_put_sbi_rcu); 1399 } 1400 1401 static struct kmem_cache *ext4_inode_cachep; 1402 1403 /* 1404 * Called inside transaction, so use GFP_NOFS 1405 */ 1406 static struct inode *ext4_alloc_inode(struct super_block *sb) 1407 { 1408 struct ext4_inode_info *ei; 1409 1410 ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS); 1411 if (!ei) 1412 return NULL; 1413 1414 inode_set_iversion(&ei->vfs_inode, 1); 1415 ei->i_flags = 0; 1416 ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ 1417 spin_lock_init(&ei->i_raw_lock); 1418 ei->i_prealloc_node = RB_ROOT; 1419 atomic_set(&ei->i_prealloc_active, 0); 1420 rwlock_init(&ei->i_prealloc_lock); 1421 ext4_es_init_tree(&ei->i_es_tree); 1422 rwlock_init(&ei->i_es_lock); 1423 INIT_LIST_HEAD(&ei->i_es_list); 1424 ei->i_es_all_nr = 0; 1425 ei->i_es_shk_nr = 0; 1426 ei->i_es_shrink_lblk = 0; 1427 ei->i_es_seq = 0; 1428 ei->i_reserved_data_blocks = 0; 1429 spin_lock_init(&(ei->i_block_reservation_lock)); 1430 ext4_init_pending_tree(&ei->i_pending_tree); 1431 #ifdef CONFIG_QUOTA 1432 ei->i_reserved_quota = 0; 1433 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 1434 #endif 1435 ei->jinode = NULL; 1436 /* 1437 * Reinitialize xattr_sem every allocation because EA inodes 1438 * share this space with i_ea_iput_node (via union) which may 1439 * have overwritten the semaphore when the slab object was 1440 * previously used as an EA inode. 1441 */ 1442 init_rwsem(&ei->xattr_sem); 1443 INIT_LIST_HEAD(&ei->i_rsv_conversion_list); 1444 spin_lock_init(&ei->i_completed_io_lock); 1445 ei->i_sync_tid = 0; 1446 ei->i_datasync_tid = 0; 1447 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); 1448 ext4_fc_init_inode(&ei->vfs_inode); 1449 spin_lock_init(&ei->i_fc_lock); 1450 ei->i_metadata_bhs = NULL; 1451 #ifdef CONFIG_LOCKDEP 1452 lockdep_set_subclass(&ei->i_data_sem, I_DATA_SEM_NORMAL); 1453 #endif 1454 return &ei->vfs_inode; 1455 } 1456 1457 static int ext4_drop_inode(struct inode *inode) 1458 { 1459 int drop = inode_generic_drop(inode); 1460 1461 if (!drop) 1462 drop = fscrypt_drop_inode(inode); 1463 1464 trace_ext4_drop_inode(inode, drop); 1465 return drop; 1466 } 1467 1468 static void ext4_free_in_core_inode(struct inode *inode) 1469 { 1470 fscrypt_free_inode(inode); 1471 kfree(ext4_i_metadata_bhs(inode)); 1472 if (!list_empty(&(EXT4_I(inode)->i_fc_list))) { 1473 pr_warn("%s: inode %llu still in fc list", 1474 __func__, inode->i_ino); 1475 } 1476 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 1477 } 1478 1479 static void ext4_destroy_inode(struct inode *inode) 1480 { 1481 if (ext4_inode_orphan_tracked(inode)) { 1482 ext4_msg(inode->i_sb, KERN_ERR, 1483 "Inode %llu (%p): inode tracked as orphan!", 1484 inode->i_ino, EXT4_I(inode)); 1485 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 1486 EXT4_I(inode), sizeof(struct ext4_inode_info), 1487 true); 1488 dump_stack(); 1489 } 1490 1491 if (!(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ERROR_FS) && 1492 WARN_ON_ONCE(EXT4_I(inode)->i_reserved_data_blocks)) 1493 ext4_msg(inode->i_sb, KERN_ERR, 1494 "Inode %llu (%p): i_reserved_data_blocks (%u) not cleared!", 1495 inode->i_ino, EXT4_I(inode), 1496 EXT4_I(inode)->i_reserved_data_blocks); 1497 } 1498 1499 static void ext4_shutdown(struct super_block *sb) 1500 { 1501 ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH); 1502 } 1503 1504 static void init_once(void *foo) 1505 { 1506 struct ext4_inode_info *ei = foo; 1507 1508 INIT_LIST_HEAD(&ei->i_orphan); 1509 init_rwsem(&ei->i_data_sem); 1510 inode_init_once(&ei->vfs_inode); 1511 ext4_fc_init_inode(&ei->vfs_inode); 1512 #ifdef CONFIG_FS_ENCRYPTION 1513 ei->i_crypt_info = NULL; 1514 #endif 1515 } 1516 1517 static int __init init_inodecache(void) 1518 { 1519 struct kmem_cache_args args = { 1520 .useroffset = offsetof(struct ext4_inode_info, i_data), 1521 .usersize = sizeof_field(struct ext4_inode_info, i_data), 1522 .use_freeptr_offset = true, 1523 .freeptr_offset = offsetof(struct ext4_inode_info, i_flags), 1524 .ctor = init_once, 1525 }; 1526 1527 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 1528 sizeof(struct ext4_inode_info), 1529 &args, 1530 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT); 1531 1532 if (ext4_inode_cachep == NULL) 1533 return -ENOMEM; 1534 return 0; 1535 } 1536 1537 static void destroy_inodecache(void) 1538 { 1539 /* 1540 * Make sure all delayed rcu free inodes are flushed before we 1541 * destroy cache. 1542 */ 1543 rcu_barrier(); 1544 kmem_cache_destroy(ext4_inode_cachep); 1545 } 1546 1547 void ext4_clear_inode(struct inode *inode) 1548 { 1549 struct mapping_metadata_bhs *mmb = ext4_i_metadata_bhs(inode); 1550 1551 ext4_fc_del(inode); 1552 if (mmb) 1553 mmb_invalidate(mmb); 1554 clear_inode(inode); 1555 ext4_discard_preallocations(inode); 1556 /* 1557 * We must remove the inode from the hash before ext4_free_inode() 1558 * clears the bit in inode bitmap as otherwise another process reusing 1559 * the inode will block in insert_inode_hash() waiting for inode 1560 * eviction to complete while holding transaction handle open, but 1561 * ext4_evict_inode() still running for that inode could block waiting 1562 * for transaction commit if the inode is marked as IS_SYNC => deadlock. 1563 * 1564 * Removing the inode from the hash here is safe. There are two cases 1565 * to consider: 1566 * 1) The inode still has references to it (i_nlink > 0). In that case 1567 * we are keeping the inode and once we remove the inode from the hash, 1568 * iget() can create the new inode structure for the same inode number 1569 * and we are fine with that as all IO on behalf of the inode is 1570 * finished. 1571 * 2) We are deleting the inode (i_nlink == 0). In that case inode 1572 * number cannot be reused until ext4_free_inode() clears the bit in 1573 * the inode bitmap, at which point all IO is done and reuse is fine 1574 * again. 1575 */ 1576 remove_inode_hash(inode); 1577 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); 1578 dquot_drop(inode); 1579 if (EXT4_I(inode)->jinode) { 1580 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 1581 EXT4_I(inode)->jinode); 1582 jbd2_free_inode(EXT4_I(inode)->jinode); 1583 EXT4_I(inode)->jinode = NULL; 1584 } 1585 fscrypt_put_encryption_info(inode); 1586 } 1587 1588 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1589 u64 ino, u32 generation) 1590 { 1591 struct inode *inode; 1592 1593 /* 1594 * Currently we don't know the generation for parent directory, so 1595 * a generation of 0 means "accept any" 1596 */ 1597 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE); 1598 if (IS_ERR(inode)) 1599 return ERR_CAST(inode); 1600 if (generation && inode->i_generation != generation) { 1601 iput(inode); 1602 return ERR_PTR(-ESTALE); 1603 } 1604 1605 return inode; 1606 } 1607 1608 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1609 int fh_len, int fh_type) 1610 { 1611 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1612 ext4_nfs_get_inode); 1613 } 1614 1615 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1616 int fh_len, int fh_type) 1617 { 1618 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1619 ext4_nfs_get_inode); 1620 } 1621 1622 static int ext4_nfs_commit_metadata(struct inode *inode) 1623 { 1624 struct writeback_control wbc = { 1625 .sync_mode = WB_SYNC_ALL 1626 }; 1627 int ret; 1628 1629 trace_ext4_nfs_commit_metadata(inode); 1630 ret = ext4_write_inode(inode, &wbc); 1631 if (!ret && inode_state_read_once(inode) & I_METADATA_WRITEBACK) 1632 ret = ext4_sync_inode_metadata(inode, &wbc); 1633 return ret; 1634 } 1635 1636 #ifdef CONFIG_QUOTA 1637 static const char * const quotatypes[] = INITQFNAMES; 1638 #define QTYPE2NAME(t) (quotatypes[t]) 1639 1640 static int ext4_write_dquot(struct dquot *dquot); 1641 static int ext4_acquire_dquot(struct dquot *dquot); 1642 static int ext4_release_dquot(struct dquot *dquot); 1643 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1644 static int ext4_write_info(struct super_block *sb, int type); 1645 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1646 const struct path *path); 1647 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1648 size_t len, loff_t off); 1649 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1650 const char *data, size_t len, loff_t off); 1651 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 1652 unsigned int flags); 1653 1654 static struct dquot __rcu **ext4_get_dquots(struct inode *inode) 1655 { 1656 return EXT4_I(inode)->i_dquot; 1657 } 1658 1659 static const struct dquot_operations ext4_quota_operations = { 1660 .get_reserved_space = ext4_get_reserved_space, 1661 .write_dquot = ext4_write_dquot, 1662 .acquire_dquot = ext4_acquire_dquot, 1663 .release_dquot = ext4_release_dquot, 1664 .mark_dirty = ext4_mark_dquot_dirty, 1665 .write_info = ext4_write_info, 1666 .alloc_dquot = dquot_alloc, 1667 .destroy_dquot = dquot_destroy, 1668 .get_projid = ext4_get_projid, 1669 .get_inode_usage = ext4_get_inode_usage, 1670 .get_next_id = dquot_get_next_id, 1671 }; 1672 1673 static const struct quotactl_ops ext4_qctl_operations = { 1674 .quota_on = ext4_quota_on, 1675 .quota_off = ext4_quota_off, 1676 .quota_sync = dquot_quota_sync, 1677 .get_state = dquot_get_state, 1678 .set_info = dquot_set_dqinfo, 1679 .get_dqblk = dquot_get_dqblk, 1680 .set_dqblk = dquot_set_dqblk, 1681 .get_nextdqblk = dquot_get_next_dqblk, 1682 }; 1683 #endif 1684 1685 static const struct super_operations ext4_sops = { 1686 .alloc_inode = ext4_alloc_inode, 1687 .free_inode = ext4_free_in_core_inode, 1688 .destroy_inode = ext4_destroy_inode, 1689 .write_inode = ext4_write_inode, 1690 .sync_inode_metadata = ext4_sync_inode_metadata, 1691 .dirty_inode = ext4_dirty_inode, 1692 .drop_inode = ext4_drop_inode, 1693 .evict_inode = ext4_evict_inode, 1694 .put_super = ext4_put_super, 1695 .sync_fs = ext4_sync_fs, 1696 .freeze_fs = ext4_freeze, 1697 .unfreeze_fs = ext4_unfreeze, 1698 .statfs = ext4_statfs, 1699 .show_options = ext4_show_options, 1700 .shutdown = ext4_shutdown, 1701 #ifdef CONFIG_QUOTA 1702 .quota_read = ext4_quota_read, 1703 .quota_write = ext4_quota_write, 1704 .get_dquots = ext4_get_dquots, 1705 #endif 1706 }; 1707 1708 static const struct export_operations ext4_export_ops = { 1709 .encode_fh = generic_encode_ino32_fh, 1710 .fh_to_dentry = ext4_fh_to_dentry, 1711 .fh_to_parent = ext4_fh_to_parent, 1712 .get_parent = ext4_get_parent, 1713 .commit_metadata = ext4_nfs_commit_metadata, 1714 }; 1715 1716 enum { 1717 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1718 Opt_resgid, Opt_resuid, Opt_sb, 1719 Opt_nouid32, Opt_debug, Opt_removed, 1720 Opt_user_xattr, Opt_acl, 1721 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 1722 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, 1723 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, 1724 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1725 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, 1726 Opt_inlinecrypt, 1727 Opt_usrjquota, Opt_grpjquota, Opt_quota, 1728 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1729 Opt_usrquota, Opt_grpquota, Opt_prjquota, 1730 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never, 1731 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error, 1732 Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize, 1733 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1734 Opt_inode_readahead_blks, Opt_journal_ioprio, 1735 Opt_dioread_nolock, Opt_dioread_lock, 1736 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1737 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache, 1738 Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan, 1739 Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type, 1740 #ifdef CONFIG_EXT4_DEBUG 1741 Opt_fc_debug_max_replay, Opt_fc_debug_force 1742 #endif 1743 }; 1744 1745 static const struct constant_table ext4_param_errors[] = { 1746 {"continue", EXT4_MOUNT_ERRORS_CONT}, 1747 {"panic", EXT4_MOUNT_ERRORS_PANIC}, 1748 {"remount-ro", EXT4_MOUNT_ERRORS_RO}, 1749 {} 1750 }; 1751 1752 static const struct constant_table ext4_param_data[] = { 1753 {"journal", EXT4_MOUNT_JOURNAL_DATA}, 1754 {"ordered", EXT4_MOUNT_ORDERED_DATA}, 1755 {"writeback", EXT4_MOUNT_WRITEBACK_DATA}, 1756 {} 1757 }; 1758 1759 static const struct constant_table ext4_param_data_err[] = { 1760 {"abort", Opt_data_err_abort}, 1761 {"ignore", Opt_data_err_ignore}, 1762 {} 1763 }; 1764 1765 static const struct constant_table ext4_param_jqfmt[] = { 1766 {"vfsold", QFMT_VFS_OLD}, 1767 {"vfsv0", QFMT_VFS_V0}, 1768 {"vfsv1", QFMT_VFS_V1}, 1769 {} 1770 }; 1771 1772 static const struct constant_table ext4_param_dax[] = { 1773 {"always", Opt_dax_always}, 1774 {"inode", Opt_dax_inode}, 1775 {"never", Opt_dax_never}, 1776 {} 1777 }; 1778 1779 /* 1780 * Mount option specification 1781 * We don't use fsparam_flag_no because of the way we set the 1782 * options and the way we show them in _ext4_show_options(). To 1783 * keep the changes to a minimum, let's keep the negative options 1784 * separate for now. 1785 */ 1786 static const struct fs_parameter_spec ext4_param_specs[] = { 1787 fsparam_flag ("bsddf", Opt_bsd_df), 1788 fsparam_flag ("minixdf", Opt_minix_df), 1789 fsparam_flag ("grpid", Opt_grpid), 1790 fsparam_flag ("bsdgroups", Opt_grpid), 1791 fsparam_flag ("nogrpid", Opt_nogrpid), 1792 fsparam_flag ("sysvgroups", Opt_nogrpid), 1793 fsparam_gid ("resgid", Opt_resgid), 1794 fsparam_uid ("resuid", Opt_resuid), 1795 fsparam_u32 ("sb", Opt_sb), 1796 fsparam_enum ("errors", Opt_errors, ext4_param_errors), 1797 fsparam_flag ("nouid32", Opt_nouid32), 1798 fsparam_flag ("debug", Opt_debug), 1799 fsparam_flag ("oldalloc", Opt_removed), 1800 fsparam_flag ("orlov", Opt_removed), 1801 fsparam_flag ("user_xattr", Opt_user_xattr), 1802 fsparam_flag ("acl", Opt_acl), 1803 fsparam_flag ("norecovery", Opt_noload), 1804 fsparam_flag ("noload", Opt_noload), 1805 fsparam_flag ("bh", Opt_removed), 1806 fsparam_flag ("nobh", Opt_removed), 1807 fsparam_u32 ("commit", Opt_commit), 1808 fsparam_u32 ("min_batch_time", Opt_min_batch_time), 1809 fsparam_u32 ("max_batch_time", Opt_max_batch_time), 1810 fsparam_u32 ("journal_dev", Opt_journal_dev), 1811 fsparam_bdev ("journal_path", Opt_journal_path), 1812 fsparam_flag ("journal_checksum", Opt_journal_checksum), 1813 fsparam_flag ("nojournal_checksum", Opt_nojournal_checksum), 1814 fsparam_flag ("journal_async_commit",Opt_journal_async_commit), 1815 fsparam_flag ("abort", Opt_abort), 1816 fsparam_enum ("data", Opt_data, ext4_param_data), 1817 fsparam_enum ("data_err", Opt_data_err, 1818 ext4_param_data_err), 1819 fsparam_string_empty 1820 ("usrjquota", Opt_usrjquota), 1821 fsparam_string_empty 1822 ("grpjquota", Opt_grpjquota), 1823 fsparam_enum ("jqfmt", Opt_jqfmt, ext4_param_jqfmt), 1824 fsparam_flag ("grpquota", Opt_grpquota), 1825 fsparam_flag ("quota", Opt_quota), 1826 fsparam_flag ("noquota", Opt_noquota), 1827 fsparam_flag ("usrquota", Opt_usrquota), 1828 fsparam_flag ("prjquota", Opt_prjquota), 1829 fsparam_flag ("barrier", Opt_barrier), 1830 fsparam_u32 ("barrier", Opt_barrier), 1831 fsparam_flag ("nobarrier", Opt_nobarrier), 1832 fsparam_flag ("i_version", Opt_removed), 1833 fsparam_flag ("dax", Opt_dax), 1834 fsparam_enum ("dax", Opt_dax_type, ext4_param_dax), 1835 fsparam_u32 ("stripe", Opt_stripe), 1836 fsparam_flag ("delalloc", Opt_delalloc), 1837 fsparam_flag ("nodelalloc", Opt_nodelalloc), 1838 fsparam_flag ("warn_on_error", Opt_warn_on_error), 1839 fsparam_flag ("nowarn_on_error", Opt_nowarn_on_error), 1840 fsparam_u32 ("debug_want_extra_isize", 1841 Opt_debug_want_extra_isize), 1842 fsparam_flag ("mblk_io_submit", Opt_removed), 1843 fsparam_flag ("nomblk_io_submit", Opt_removed), 1844 fsparam_flag ("block_validity", Opt_block_validity), 1845 fsparam_flag ("noblock_validity", Opt_noblock_validity), 1846 fsparam_u32 ("inode_readahead_blks", 1847 Opt_inode_readahead_blks), 1848 fsparam_u32 ("journal_ioprio", Opt_journal_ioprio), 1849 fsparam_u32 ("auto_da_alloc", Opt_auto_da_alloc), 1850 fsparam_flag ("auto_da_alloc", Opt_auto_da_alloc), 1851 fsparam_flag ("noauto_da_alloc", Opt_noauto_da_alloc), 1852 fsparam_flag ("dioread_nolock", Opt_dioread_nolock), 1853 fsparam_flag ("nodioread_nolock", Opt_dioread_lock), 1854 fsparam_flag ("dioread_lock", Opt_dioread_lock), 1855 fsparam_flag ("discard", Opt_discard), 1856 fsparam_flag ("nodiscard", Opt_nodiscard), 1857 fsparam_u32 ("init_itable", Opt_init_itable), 1858 fsparam_flag ("init_itable", Opt_init_itable), 1859 fsparam_flag ("noinit_itable", Opt_noinit_itable), 1860 #ifdef CONFIG_EXT4_DEBUG 1861 fsparam_flag ("fc_debug_force", Opt_fc_debug_force), 1862 fsparam_u32 ("fc_debug_max_replay", Opt_fc_debug_max_replay), 1863 #endif 1864 fsparam_u32 ("max_dir_size_kb", Opt_max_dir_size_kb), 1865 fsparam_flag ("test_dummy_encryption", 1866 Opt_test_dummy_encryption), 1867 fsparam_string ("test_dummy_encryption", 1868 Opt_test_dummy_encryption), 1869 fsparam_flag ("inlinecrypt", Opt_inlinecrypt), 1870 fsparam_flag ("nombcache", Opt_nombcache), 1871 fsparam_flag ("no_mbcache", Opt_nombcache), /* for backward compatibility */ 1872 fsparam_flag ("prefetch_block_bitmaps", 1873 Opt_removed), 1874 fsparam_flag ("no_prefetch_block_bitmaps", 1875 Opt_no_prefetch_block_bitmaps), 1876 fsparam_s32 ("mb_optimize_scan", Opt_mb_optimize_scan), 1877 fsparam_string ("check", Opt_removed), /* mount option from ext2/3 */ 1878 fsparam_flag ("nocheck", Opt_removed), /* mount option from ext2/3 */ 1879 fsparam_flag ("reservation", Opt_removed), /* mount option from ext2/3 */ 1880 fsparam_flag ("noreservation", Opt_removed), /* mount option from ext2/3 */ 1881 fsparam_u32 ("journal", Opt_removed), /* mount option from ext2/3 */ 1882 {} 1883 }; 1884 1885 1886 #define MOPT_SET 0x0001 1887 #define MOPT_CLEAR 0x0002 1888 #define MOPT_NOSUPPORT 0x0004 1889 #define MOPT_EXPLICIT 0x0008 1890 #ifdef CONFIG_QUOTA 1891 #define MOPT_Q 0 1892 #define MOPT_QFMT 0x0010 1893 #else 1894 #define MOPT_Q MOPT_NOSUPPORT 1895 #define MOPT_QFMT MOPT_NOSUPPORT 1896 #endif 1897 #define MOPT_NO_EXT2 0x0020 1898 #define MOPT_NO_EXT3 0x0040 1899 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) 1900 #define MOPT_SKIP 0x0080 1901 #define MOPT_2 0x0100 1902 1903 static const struct mount_opts { 1904 int token; 1905 int mount_opt; 1906 int flags; 1907 } ext4_mount_opts[] = { 1908 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, 1909 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, 1910 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, 1911 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, 1912 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, 1913 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, 1914 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, 1915 MOPT_EXT4_ONLY | MOPT_SET}, 1916 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, 1917 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1918 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, 1919 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, 1920 {Opt_delalloc, EXT4_MOUNT_DELALLOC, 1921 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1922 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, 1923 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1924 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET}, 1925 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR}, 1926 {Opt_commit, 0, MOPT_NO_EXT2}, 1927 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1928 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1929 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1930 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1931 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | 1932 EXT4_MOUNT_JOURNAL_CHECKSUM), 1933 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1934 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, 1935 {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2}, 1936 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, 1937 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, 1938 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, 1939 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, 1940 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, 1941 {Opt_dax_type, 0, MOPT_EXT4_ONLY}, 1942 {Opt_journal_dev, 0, MOPT_NO_EXT2}, 1943 {Opt_journal_path, 0, MOPT_NO_EXT2}, 1944 {Opt_journal_ioprio, 0, MOPT_NO_EXT2}, 1945 {Opt_data, 0, MOPT_NO_EXT2}, 1946 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, 1947 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1948 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, 1949 #else 1950 {Opt_acl, 0, MOPT_NOSUPPORT}, 1951 #endif 1952 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, 1953 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, 1954 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, 1955 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, 1956 MOPT_SET | MOPT_Q}, 1957 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, 1958 MOPT_SET | MOPT_Q}, 1959 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA, 1960 MOPT_SET | MOPT_Q}, 1961 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 1962 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA), 1963 MOPT_CLEAR | MOPT_Q}, 1964 {Opt_usrjquota, 0, MOPT_Q}, 1965 {Opt_grpjquota, 0, MOPT_Q}, 1966 {Opt_jqfmt, 0, MOPT_QFMT}, 1967 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET}, 1968 {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS, 1969 MOPT_SET}, 1970 #ifdef CONFIG_EXT4_DEBUG 1971 {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT, 1972 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY}, 1973 #endif 1974 {Opt_abort, EXT4_MOUNT2_ABORT, MOPT_SET | MOPT_2}, 1975 {Opt_err, 0, 0} 1976 }; 1977 1978 #if IS_ENABLED(CONFIG_UNICODE) 1979 static const struct ext4_sb_encodings { 1980 __u16 magic; 1981 char *name; 1982 unsigned int version; 1983 } ext4_sb_encoding_map[] = { 1984 {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)}, 1985 }; 1986 1987 static const struct ext4_sb_encodings * 1988 ext4_sb_read_encoding(const struct ext4_super_block *es) 1989 { 1990 __u16 magic = le16_to_cpu(es->s_encoding); 1991 int i; 1992 1993 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++) 1994 if (magic == ext4_sb_encoding_map[i].magic) 1995 return &ext4_sb_encoding_map[i]; 1996 1997 return NULL; 1998 } 1999 #endif 2000 2001 #define EXT4_SPEC_JQUOTA (1 << 0) 2002 #define EXT4_SPEC_JQFMT (1 << 1) 2003 #define EXT4_SPEC_DATAJ (1 << 2) 2004 #define EXT4_SPEC_SB_BLOCK (1 << 3) 2005 #define EXT4_SPEC_JOURNAL_DEV (1 << 4) 2006 #define EXT4_SPEC_JOURNAL_IOPRIO (1 << 5) 2007 #define EXT4_SPEC_s_want_extra_isize (1 << 7) 2008 #define EXT4_SPEC_s_max_batch_time (1 << 8) 2009 #define EXT4_SPEC_s_min_batch_time (1 << 9) 2010 #define EXT4_SPEC_s_inode_readahead_blks (1 << 10) 2011 #define EXT4_SPEC_s_li_wait_mult (1 << 11) 2012 #define EXT4_SPEC_s_max_dir_size_kb (1 << 12) 2013 #define EXT4_SPEC_s_stripe (1 << 13) 2014 #define EXT4_SPEC_s_resuid (1 << 14) 2015 #define EXT4_SPEC_s_resgid (1 << 15) 2016 #define EXT4_SPEC_s_commit_interval (1 << 16) 2017 #define EXT4_SPEC_s_fc_debug_max_replay (1 << 17) 2018 #define EXT4_SPEC_s_sb_block (1 << 18) 2019 #define EXT4_SPEC_mb_optimize_scan (1 << 19) 2020 2021 struct ext4_fs_context { 2022 char *s_qf_names[EXT4_MAXQUOTAS]; 2023 struct fscrypt_dummy_policy dummy_enc_policy; 2024 int s_jquota_fmt; /* Format of quota to use */ 2025 #ifdef CONFIG_EXT4_DEBUG 2026 int s_fc_debug_max_replay; 2027 #endif 2028 unsigned short qname_spec; 2029 unsigned long vals_s_flags; /* Bits to set in s_flags */ 2030 unsigned long mask_s_flags; /* Bits changed in s_flags */ 2031 unsigned long journal_devnum; 2032 unsigned long s_commit_interval; 2033 unsigned long s_stripe; 2034 unsigned int s_inode_readahead_blks; 2035 unsigned int s_want_extra_isize; 2036 unsigned int s_li_wait_mult; 2037 unsigned int s_max_dir_size_kb; 2038 unsigned int journal_ioprio; 2039 unsigned int vals_s_mount_opt; 2040 unsigned int mask_s_mount_opt; 2041 unsigned int vals_s_mount_opt2; 2042 unsigned int mask_s_mount_opt2; 2043 unsigned int opt_flags; /* MOPT flags */ 2044 unsigned int spec; 2045 u32 s_max_batch_time; 2046 u32 s_min_batch_time; 2047 kuid_t s_resuid; 2048 kgid_t s_resgid; 2049 ext4_fsblk_t s_sb_block; 2050 }; 2051 2052 static void ext4_fc_free(struct fs_context *fc) 2053 { 2054 struct ext4_fs_context *ctx = fc->fs_private; 2055 int i; 2056 2057 if (!ctx) 2058 return; 2059 2060 for (i = 0; i < EXT4_MAXQUOTAS; i++) 2061 kfree(ctx->s_qf_names[i]); 2062 2063 fscrypt_free_dummy_policy(&ctx->dummy_enc_policy); 2064 kfree(ctx); 2065 } 2066 2067 int ext4_init_fs_context(struct fs_context *fc) 2068 { 2069 struct ext4_fs_context *ctx; 2070 2071 ctx = kzalloc_obj(struct ext4_fs_context); 2072 if (!ctx) 2073 return -ENOMEM; 2074 2075 fc->fs_private = ctx; 2076 fc->ops = &ext4_context_ops; 2077 2078 /* i_version is always enabled now */ 2079 fc->sb_flags |= SB_I_VERSION; 2080 2081 return 0; 2082 } 2083 2084 #ifdef CONFIG_QUOTA 2085 /* 2086 * Note the name of the specified quota file. 2087 */ 2088 static int note_qf_name(struct fs_context *fc, int qtype, 2089 struct fs_parameter *param) 2090 { 2091 struct ext4_fs_context *ctx = fc->fs_private; 2092 char *qname; 2093 2094 if (param->size < 1) { 2095 ext4_msg(NULL, KERN_ERR, "Missing quota name"); 2096 return -EINVAL; 2097 } 2098 if (strchr(param->string, '/')) { 2099 ext4_msg(NULL, KERN_ERR, 2100 "quotafile must be on filesystem root"); 2101 return -EINVAL; 2102 } 2103 if (ctx->s_qf_names[qtype]) { 2104 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) { 2105 ext4_msg(NULL, KERN_ERR, 2106 "%s quota file already specified", 2107 QTYPE2NAME(qtype)); 2108 return -EINVAL; 2109 } 2110 return 0; 2111 } 2112 2113 qname = kmemdup_nul(param->string, param->size, GFP_KERNEL); 2114 if (!qname) { 2115 ext4_msg(NULL, KERN_ERR, 2116 "Not enough memory for storing quotafile name"); 2117 return -ENOMEM; 2118 } 2119 ctx->s_qf_names[qtype] = qname; 2120 ctx->qname_spec |= 1 << qtype; 2121 ctx->spec |= EXT4_SPEC_JQUOTA; 2122 return 0; 2123 } 2124 2125 /* 2126 * Clear the name of the specified quota file. 2127 */ 2128 static int unnote_qf_name(struct fs_context *fc, int qtype) 2129 { 2130 struct ext4_fs_context *ctx = fc->fs_private; 2131 2132 kfree(ctx->s_qf_names[qtype]); 2133 2134 ctx->s_qf_names[qtype] = NULL; 2135 ctx->qname_spec |= 1 << qtype; 2136 ctx->spec |= EXT4_SPEC_JQUOTA; 2137 return 0; 2138 } 2139 #endif 2140 2141 static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param, 2142 struct ext4_fs_context *ctx) 2143 { 2144 int err; 2145 2146 if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) { 2147 ext4_msg(NULL, KERN_WARNING, 2148 "test_dummy_encryption option not supported"); 2149 return -EINVAL; 2150 } 2151 err = fscrypt_parse_test_dummy_encryption(param, 2152 &ctx->dummy_enc_policy); 2153 if (err == -EINVAL) { 2154 ext4_msg(NULL, KERN_WARNING, 2155 "Value of option \"%s\" is unrecognized", param->key); 2156 } else if (err == -EEXIST) { 2157 ext4_msg(NULL, KERN_WARNING, 2158 "Conflicting test_dummy_encryption options"); 2159 return -EINVAL; 2160 } 2161 return err; 2162 } 2163 2164 #define EXT4_SET_CTX(name) \ 2165 static inline __maybe_unused \ 2166 void ctx_set_##name(struct ext4_fs_context *ctx, unsigned long flag) \ 2167 { \ 2168 ctx->mask_s_##name |= flag; \ 2169 ctx->vals_s_##name |= flag; \ 2170 } 2171 2172 #define EXT4_CLEAR_CTX(name) \ 2173 static inline __maybe_unused \ 2174 void ctx_clear_##name(struct ext4_fs_context *ctx, unsigned long flag) \ 2175 { \ 2176 ctx->mask_s_##name |= flag; \ 2177 ctx->vals_s_##name &= ~flag; \ 2178 } 2179 2180 #define EXT4_TEST_CTX(name) \ 2181 static inline unsigned long \ 2182 ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \ 2183 { \ 2184 return (ctx->vals_s_##name & flag); \ 2185 } 2186 2187 EXT4_SET_CTX(flags); /* set only */ 2188 EXT4_SET_CTX(mount_opt); 2189 EXT4_CLEAR_CTX(mount_opt); 2190 EXT4_TEST_CTX(mount_opt); 2191 EXT4_SET_CTX(mount_opt2); 2192 EXT4_CLEAR_CTX(mount_opt2); 2193 EXT4_TEST_CTX(mount_opt2); 2194 2195 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param) 2196 { 2197 struct ext4_fs_context *ctx = fc->fs_private; 2198 struct fs_parse_result result; 2199 const struct mount_opts *m; 2200 int is_remount; 2201 int token; 2202 2203 token = fs_parse(fc, ext4_param_specs, param, &result); 2204 if (token < 0) 2205 return token; 2206 is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE; 2207 2208 for (m = ext4_mount_opts; m->token != Opt_err; m++) 2209 if (token == m->token) 2210 break; 2211 2212 ctx->opt_flags |= m->flags; 2213 2214 if (m->flags & MOPT_EXPLICIT) { 2215 if (m->mount_opt & EXT4_MOUNT_DELALLOC) { 2216 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC); 2217 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { 2218 ctx_set_mount_opt2(ctx, 2219 EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM); 2220 } else 2221 return -EINVAL; 2222 } 2223 2224 if (m->flags & MOPT_NOSUPPORT) { 2225 ext4_msg(NULL, KERN_ERR, "%s option not supported", 2226 param->key); 2227 return 0; 2228 } 2229 2230 switch (token) { 2231 #ifdef CONFIG_QUOTA 2232 case Opt_usrjquota: 2233 if (!*param->string) 2234 return unnote_qf_name(fc, USRQUOTA); 2235 else 2236 return note_qf_name(fc, USRQUOTA, param); 2237 case Opt_grpjquota: 2238 if (!*param->string) 2239 return unnote_qf_name(fc, GRPQUOTA); 2240 else 2241 return note_qf_name(fc, GRPQUOTA, param); 2242 #endif 2243 case Opt_sb: 2244 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 2245 ext4_msg(NULL, KERN_WARNING, 2246 "Ignoring %s option on remount", param->key); 2247 } else { 2248 ctx->s_sb_block = result.uint_32; 2249 ctx->spec |= EXT4_SPEC_s_sb_block; 2250 } 2251 return 0; 2252 case Opt_removed: 2253 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option", 2254 param->key); 2255 return 0; 2256 case Opt_inlinecrypt: 2257 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT 2258 ctx_set_flags(ctx, SB_INLINECRYPT); 2259 #else 2260 ext4_msg(NULL, KERN_ERR, "inline encryption not supported"); 2261 #endif 2262 return 0; 2263 case Opt_errors: 2264 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK); 2265 ctx_set_mount_opt(ctx, result.uint_32); 2266 return 0; 2267 #ifdef CONFIG_QUOTA 2268 case Opt_jqfmt: 2269 ctx->s_jquota_fmt = result.uint_32; 2270 ctx->spec |= EXT4_SPEC_JQFMT; 2271 return 0; 2272 #endif 2273 case Opt_data: 2274 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS); 2275 ctx_set_mount_opt(ctx, result.uint_32); 2276 ctx->spec |= EXT4_SPEC_DATAJ; 2277 return 0; 2278 case Opt_commit: 2279 if (result.uint_32 == 0) 2280 result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE; 2281 else if (result.uint_32 > INT_MAX / HZ) { 2282 ext4_msg(NULL, KERN_ERR, 2283 "Invalid commit interval %d, " 2284 "must be smaller than %d", 2285 result.uint_32, INT_MAX / HZ); 2286 return -EINVAL; 2287 } 2288 ctx->s_commit_interval = HZ * result.uint_32; 2289 ctx->spec |= EXT4_SPEC_s_commit_interval; 2290 return 0; 2291 case Opt_debug_want_extra_isize: 2292 if ((result.uint_32 & 1) || (result.uint_32 < 4)) { 2293 ext4_msg(NULL, KERN_ERR, 2294 "Invalid want_extra_isize %d", result.uint_32); 2295 return -EINVAL; 2296 } 2297 ctx->s_want_extra_isize = result.uint_32; 2298 ctx->spec |= EXT4_SPEC_s_want_extra_isize; 2299 return 0; 2300 case Opt_max_batch_time: 2301 ctx->s_max_batch_time = result.uint_32; 2302 ctx->spec |= EXT4_SPEC_s_max_batch_time; 2303 return 0; 2304 case Opt_min_batch_time: 2305 ctx->s_min_batch_time = result.uint_32; 2306 ctx->spec |= EXT4_SPEC_s_min_batch_time; 2307 return 0; 2308 case Opt_inode_readahead_blks: 2309 if (result.uint_32 && 2310 (result.uint_32 > (1 << 30) || 2311 !is_power_of_2(result.uint_32))) { 2312 ext4_msg(NULL, KERN_ERR, 2313 "EXT4-fs: inode_readahead_blks must be " 2314 "0 or a power of 2 smaller than 2^31"); 2315 return -EINVAL; 2316 } 2317 ctx->s_inode_readahead_blks = result.uint_32; 2318 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks; 2319 return 0; 2320 case Opt_init_itable: 2321 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE); 2322 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 2323 if (param->type == fs_value_is_string) 2324 ctx->s_li_wait_mult = result.uint_32; 2325 ctx->spec |= EXT4_SPEC_s_li_wait_mult; 2326 return 0; 2327 case Opt_max_dir_size_kb: 2328 ctx->s_max_dir_size_kb = result.uint_32; 2329 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb; 2330 return 0; 2331 #ifdef CONFIG_EXT4_DEBUG 2332 case Opt_fc_debug_max_replay: 2333 ctx->s_fc_debug_max_replay = result.uint_32; 2334 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay; 2335 return 0; 2336 #endif 2337 case Opt_stripe: 2338 ctx->s_stripe = result.uint_32; 2339 ctx->spec |= EXT4_SPEC_s_stripe; 2340 return 0; 2341 case Opt_resuid: 2342 ctx->s_resuid = result.uid; 2343 ctx->spec |= EXT4_SPEC_s_resuid; 2344 return 0; 2345 case Opt_resgid: 2346 ctx->s_resgid = result.gid; 2347 ctx->spec |= EXT4_SPEC_s_resgid; 2348 return 0; 2349 case Opt_journal_dev: 2350 if (is_remount) { 2351 ext4_msg(NULL, KERN_ERR, 2352 "Cannot specify journal on remount"); 2353 return -EINVAL; 2354 } 2355 ctx->journal_devnum = result.uint_32; 2356 ctx->spec |= EXT4_SPEC_JOURNAL_DEV; 2357 return 0; 2358 case Opt_journal_path: 2359 { 2360 struct inode *journal_inode; 2361 struct path path; 2362 int error; 2363 2364 if (is_remount) { 2365 ext4_msg(NULL, KERN_ERR, 2366 "Cannot specify journal on remount"); 2367 return -EINVAL; 2368 } 2369 2370 error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path); 2371 if (error) { 2372 ext4_msg(NULL, KERN_ERR, "error: could not find " 2373 "journal device path"); 2374 return -EINVAL; 2375 } 2376 2377 journal_inode = d_inode(path.dentry); 2378 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev); 2379 ctx->spec |= EXT4_SPEC_JOURNAL_DEV; 2380 path_put(&path); 2381 return 0; 2382 } 2383 case Opt_journal_ioprio: 2384 if (result.uint_32 > 7) { 2385 ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority" 2386 " (must be 0-7)"); 2387 return -EINVAL; 2388 } 2389 ctx->journal_ioprio = 2390 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32); 2391 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO; 2392 return 0; 2393 case Opt_test_dummy_encryption: 2394 return ext4_parse_test_dummy_encryption(param, ctx); 2395 case Opt_dax: 2396 case Opt_dax_type: 2397 #ifdef CONFIG_FS_DAX 2398 { 2399 int type = (token == Opt_dax) ? 2400 Opt_dax : result.uint_32; 2401 2402 switch (type) { 2403 case Opt_dax: 2404 case Opt_dax_always: 2405 ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS); 2406 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER); 2407 break; 2408 case Opt_dax_never: 2409 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER); 2410 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS); 2411 break; 2412 case Opt_dax_inode: 2413 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS); 2414 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER); 2415 /* Strictly for printing options */ 2416 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE); 2417 break; 2418 } 2419 return 0; 2420 } 2421 #else 2422 ext4_msg(NULL, KERN_INFO, "dax option not supported"); 2423 return -EINVAL; 2424 #endif 2425 case Opt_data_err: 2426 if (result.uint_32 == Opt_data_err_abort) 2427 ctx_set_mount_opt(ctx, m->mount_opt); 2428 else if (result.uint_32 == Opt_data_err_ignore) 2429 ctx_clear_mount_opt(ctx, m->mount_opt); 2430 return 0; 2431 case Opt_mb_optimize_scan: 2432 if (result.int_32 == 1) { 2433 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN); 2434 ctx->spec |= EXT4_SPEC_mb_optimize_scan; 2435 } else if (result.int_32 == 0) { 2436 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN); 2437 ctx->spec |= EXT4_SPEC_mb_optimize_scan; 2438 } else { 2439 ext4_msg(NULL, KERN_WARNING, 2440 "mb_optimize_scan should be set to 0 or 1."); 2441 return -EINVAL; 2442 } 2443 return 0; 2444 } 2445 2446 /* 2447 * At this point we should only be getting options requiring MOPT_SET, 2448 * or MOPT_CLEAR. Anything else is a bug 2449 */ 2450 if (m->token == Opt_err) { 2451 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s", 2452 param->key); 2453 WARN_ON(1); 2454 return -EINVAL; 2455 } 2456 2457 else { 2458 unsigned int set = 0; 2459 2460 if ((param->type == fs_value_is_flag) || 2461 result.uint_32 > 0) 2462 set = 1; 2463 2464 if (m->flags & MOPT_CLEAR) 2465 set = !set; 2466 else if (unlikely(!(m->flags & MOPT_SET))) { 2467 ext4_msg(NULL, KERN_WARNING, 2468 "buggy handling of option %s", 2469 param->key); 2470 WARN_ON(1); 2471 return -EINVAL; 2472 } 2473 if (m->flags & MOPT_2) { 2474 if (set != 0) 2475 ctx_set_mount_opt2(ctx, m->mount_opt); 2476 else 2477 ctx_clear_mount_opt2(ctx, m->mount_opt); 2478 } else { 2479 if (set != 0) 2480 ctx_set_mount_opt(ctx, m->mount_opt); 2481 else 2482 ctx_clear_mount_opt(ctx, m->mount_opt); 2483 } 2484 } 2485 2486 return 0; 2487 } 2488 2489 static int parse_options(struct fs_context *fc, char *options) 2490 { 2491 struct fs_parameter param; 2492 int ret; 2493 char *key; 2494 2495 if (!options) 2496 return 0; 2497 2498 while ((key = strsep(&options, ",")) != NULL) { 2499 if (*key) { 2500 size_t v_len = 0; 2501 char *value = strchr(key, '='); 2502 2503 param.type = fs_value_is_flag; 2504 param.string = NULL; 2505 2506 if (value) { 2507 if (value == key) 2508 continue; 2509 2510 *value++ = 0; 2511 v_len = strlen(value); 2512 param.string = kmemdup_nul(value, v_len, 2513 GFP_KERNEL); 2514 if (!param.string) 2515 return -ENOMEM; 2516 param.type = fs_value_is_string; 2517 } 2518 2519 param.key = key; 2520 param.size = v_len; 2521 2522 ret = ext4_parse_param(fc, ¶m); 2523 kfree(param.string); 2524 if (ret < 0) 2525 return ret; 2526 } 2527 } 2528 2529 ret = ext4_validate_options(fc); 2530 if (ret < 0) 2531 return ret; 2532 2533 return 0; 2534 } 2535 2536 static int parse_apply_sb_mount_options(struct super_block *sb, 2537 struct ext4_fs_context *m_ctx) 2538 { 2539 struct ext4_sb_info *sbi = EXT4_SB(sb); 2540 char s_mount_opts[64]; 2541 struct ext4_fs_context *s_ctx = NULL; 2542 struct fs_context *fc = NULL; 2543 int ret = -ENOMEM; 2544 2545 if (!sbi->s_es->s_mount_opts[0]) 2546 return 0; 2547 2548 if (strscpy_pad(s_mount_opts, sbi->s_es->s_mount_opts) < 0) 2549 return -E2BIG; 2550 2551 fc = kzalloc_obj(struct fs_context); 2552 if (!fc) 2553 return -ENOMEM; 2554 2555 s_ctx = kzalloc_obj(struct ext4_fs_context); 2556 if (!s_ctx) 2557 goto out_free; 2558 2559 fc->fs_private = s_ctx; 2560 fc->s_fs_info = sbi; 2561 2562 ret = parse_options(fc, s_mount_opts); 2563 if (ret < 0) 2564 goto parse_failed; 2565 2566 ret = ext4_check_opt_consistency(fc, sb); 2567 if (ret < 0) { 2568 parse_failed: 2569 ext4_msg(sb, KERN_WARNING, 2570 "failed to parse options in superblock: %s", 2571 s_mount_opts); 2572 ret = 0; 2573 goto out_free; 2574 } 2575 2576 if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV) 2577 m_ctx->journal_devnum = s_ctx->journal_devnum; 2578 if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO) 2579 m_ctx->journal_ioprio = s_ctx->journal_ioprio; 2580 2581 ext4_apply_options(fc, sb); 2582 ret = 0; 2583 2584 out_free: 2585 ext4_fc_free(fc); 2586 kfree(fc); 2587 return ret; 2588 } 2589 2590 static void ext4_apply_quota_options(struct fs_context *fc, 2591 struct super_block *sb) 2592 { 2593 #ifdef CONFIG_QUOTA 2594 bool quota_feature = ext4_has_feature_quota(sb); 2595 struct ext4_fs_context *ctx = fc->fs_private; 2596 struct ext4_sb_info *sbi = EXT4_SB(sb); 2597 char *qname; 2598 int i; 2599 2600 if (quota_feature) 2601 return; 2602 2603 if (ctx->spec & EXT4_SPEC_JQUOTA) { 2604 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2605 if (!(ctx->qname_spec & (1 << i))) 2606 continue; 2607 2608 qname = ctx->s_qf_names[i]; /* May be NULL */ 2609 if (qname) 2610 set_opt(sb, QUOTA); 2611 ctx->s_qf_names[i] = NULL; 2612 qname = rcu_replace_pointer(sbi->s_qf_names[i], qname, 2613 lockdep_is_held(&sb->s_umount)); 2614 if (qname) 2615 kfree_rcu_mightsleep(qname); 2616 } 2617 } 2618 2619 if (ctx->spec & EXT4_SPEC_JQFMT) 2620 sbi->s_jquota_fmt = ctx->s_jquota_fmt; 2621 #endif 2622 } 2623 2624 /* 2625 * Check quota settings consistency. 2626 */ 2627 static int ext4_check_quota_consistency(struct fs_context *fc, 2628 struct super_block *sb) 2629 { 2630 #ifdef CONFIG_QUOTA 2631 struct ext4_fs_context *ctx = fc->fs_private; 2632 struct ext4_sb_info *sbi = EXT4_SB(sb); 2633 bool quota_feature = ext4_has_feature_quota(sb); 2634 bool quota_loaded = sb_any_quota_loaded(sb); 2635 bool usr_qf_name, grp_qf_name, usrquota, grpquota; 2636 int quota_flags, i; 2637 2638 /* 2639 * We do the test below only for project quotas. 'usrquota' and 2640 * 'grpquota' mount options are allowed even without quota feature 2641 * to support legacy quotas in quota files. 2642 */ 2643 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) && 2644 !ext4_has_feature_project(sb)) { 2645 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. " 2646 "Cannot enable project quota enforcement."); 2647 return -EINVAL; 2648 } 2649 2650 quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 2651 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA; 2652 if (quota_loaded && 2653 ctx->mask_s_mount_opt & quota_flags && 2654 !ctx_test_mount_opt(ctx, quota_flags)) 2655 goto err_quota_change; 2656 2657 if (ctx->spec & EXT4_SPEC_JQUOTA) { 2658 2659 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2660 if (!(ctx->qname_spec & (1 << i))) 2661 continue; 2662 2663 if (quota_loaded && 2664 !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i]) 2665 goto err_jquota_change; 2666 2667 if (sbi->s_qf_names[i] && ctx->s_qf_names[i] && 2668 strcmp(get_qf_name(sb, sbi, i), 2669 ctx->s_qf_names[i]) != 0) 2670 goto err_jquota_specified; 2671 } 2672 2673 if (quota_feature) { 2674 ext4_msg(NULL, KERN_INFO, 2675 "Journaled quota options ignored when " 2676 "QUOTA feature is enabled"); 2677 return 0; 2678 } 2679 } 2680 2681 if (ctx->spec & EXT4_SPEC_JQFMT) { 2682 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded) 2683 goto err_jquota_change; 2684 if (quota_feature) { 2685 ext4_msg(NULL, KERN_INFO, "Quota format mount options " 2686 "ignored when QUOTA feature is enabled"); 2687 return 0; 2688 } 2689 } 2690 2691 /* Make sure we don't mix old and new quota format */ 2692 usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) || 2693 ctx->s_qf_names[USRQUOTA]); 2694 grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) || 2695 ctx->s_qf_names[GRPQUOTA]); 2696 2697 usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) || 2698 test_opt(sb, USRQUOTA)); 2699 2700 grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) || 2701 test_opt(sb, GRPQUOTA)); 2702 2703 if (usr_qf_name) { 2704 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA); 2705 usrquota = false; 2706 } 2707 if (grp_qf_name) { 2708 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA); 2709 grpquota = false; 2710 } 2711 2712 if (usr_qf_name || grp_qf_name) { 2713 if (usrquota || grpquota) { 2714 ext4_msg(NULL, KERN_ERR, "old and new quota " 2715 "format mixing"); 2716 return -EINVAL; 2717 } 2718 2719 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) { 2720 ext4_msg(NULL, KERN_ERR, "journaled quota format " 2721 "not specified"); 2722 return -EINVAL; 2723 } 2724 } 2725 2726 return 0; 2727 2728 err_quota_change: 2729 ext4_msg(NULL, KERN_ERR, 2730 "Cannot change quota options when quota turned on"); 2731 return -EINVAL; 2732 err_jquota_change: 2733 ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota " 2734 "options when quota turned on"); 2735 return -EINVAL; 2736 err_jquota_specified: 2737 ext4_msg(NULL, KERN_ERR, "%s quota file already specified", 2738 QTYPE2NAME(i)); 2739 return -EINVAL; 2740 #else 2741 return 0; 2742 #endif 2743 } 2744 2745 static int ext4_check_test_dummy_encryption(const struct fs_context *fc, 2746 struct super_block *sb) 2747 { 2748 const struct ext4_fs_context *ctx = fc->fs_private; 2749 const struct ext4_sb_info *sbi = EXT4_SB(sb); 2750 2751 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy)) 2752 return 0; 2753 2754 if (!ext4_has_feature_encrypt(sb)) { 2755 ext4_msg(NULL, KERN_WARNING, 2756 "test_dummy_encryption requires encrypt feature"); 2757 return -EINVAL; 2758 } 2759 /* 2760 * This mount option is just for testing, and it's not worthwhile to 2761 * implement the extra complexity (e.g. RCU protection) that would be 2762 * needed to allow it to be set or changed during remount. We do allow 2763 * it to be specified during remount, but only if there is no change. 2764 */ 2765 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 2766 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy, 2767 &ctx->dummy_enc_policy)) 2768 return 0; 2769 ext4_msg(NULL, KERN_WARNING, 2770 "Can't set or change test_dummy_encryption on remount"); 2771 return -EINVAL; 2772 } 2773 /* Also make sure s_mount_opts didn't contain a conflicting value. */ 2774 if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) { 2775 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy, 2776 &ctx->dummy_enc_policy)) 2777 return 0; 2778 ext4_msg(NULL, KERN_WARNING, 2779 "Conflicting test_dummy_encryption options"); 2780 return -EINVAL; 2781 } 2782 return 0; 2783 } 2784 2785 static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx, 2786 struct super_block *sb) 2787 { 2788 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) || 2789 /* if already set, it was already verified to be the same */ 2790 fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy)) 2791 return; 2792 EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy; 2793 memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy)); 2794 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled"); 2795 } 2796 2797 static int ext4_check_opt_consistency(struct fs_context *fc, 2798 struct super_block *sb) 2799 { 2800 struct ext4_fs_context *ctx = fc->fs_private; 2801 struct ext4_sb_info *sbi = fc->s_fs_info; 2802 int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE; 2803 int err; 2804 2805 if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { 2806 ext4_msg(NULL, KERN_ERR, 2807 "Mount option(s) incompatible with ext2"); 2808 return -EINVAL; 2809 } 2810 if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { 2811 ext4_msg(NULL, KERN_ERR, 2812 "Mount option(s) incompatible with ext3"); 2813 return -EINVAL; 2814 } 2815 2816 if (ctx->s_want_extra_isize > 2817 (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) { 2818 ext4_msg(NULL, KERN_ERR, 2819 "Invalid want_extra_isize %d", 2820 ctx->s_want_extra_isize); 2821 return -EINVAL; 2822 } 2823 2824 err = ext4_check_test_dummy_encryption(fc, sb); 2825 if (err) 2826 return err; 2827 2828 if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) { 2829 if (!sbi->s_journal) { 2830 ext4_msg(NULL, KERN_WARNING, 2831 "Remounting file system with no journal " 2832 "so ignoring journalled data option"); 2833 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS); 2834 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) != 2835 test_opt(sb, DATA_FLAGS)) { 2836 ext4_msg(NULL, KERN_ERR, "Cannot change data mode " 2837 "on remount"); 2838 return -EINVAL; 2839 } 2840 } 2841 2842 if (is_remount) { 2843 if (!sbi->s_journal && 2844 ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_ERR_ABORT)) { 2845 ext4_msg(NULL, KERN_WARNING, 2846 "Remounting fs w/o journal so ignoring data_err option"); 2847 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_ERR_ABORT); 2848 } 2849 2850 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) && 2851 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) { 2852 ext4_msg(NULL, KERN_ERR, "can't mount with " 2853 "both data=journal and dax"); 2854 return -EINVAL; 2855 } 2856 2857 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) && 2858 (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) || 2859 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) { 2860 fail_dax_change_remount: 2861 ext4_msg(NULL, KERN_ERR, "can't change " 2862 "dax mount option while remounting"); 2863 return -EINVAL; 2864 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) && 2865 (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) || 2866 (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) { 2867 goto fail_dax_change_remount; 2868 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) && 2869 ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) || 2870 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) || 2871 !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) { 2872 goto fail_dax_change_remount; 2873 } 2874 } 2875 2876 return ext4_check_quota_consistency(fc, sb); 2877 } 2878 2879 static void ext4_apply_options(struct fs_context *fc, struct super_block *sb) 2880 { 2881 struct ext4_fs_context *ctx = fc->fs_private; 2882 struct ext4_sb_info *sbi = fc->s_fs_info; 2883 2884 sbi->s_mount_opt &= ~ctx->mask_s_mount_opt; 2885 sbi->s_mount_opt |= ctx->vals_s_mount_opt; 2886 sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2; 2887 sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2; 2888 sb->s_flags &= ~ctx->mask_s_flags; 2889 sb->s_flags |= ctx->vals_s_flags; 2890 2891 #define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; }) 2892 APPLY(s_commit_interval); 2893 APPLY(s_stripe); 2894 APPLY(s_max_batch_time); 2895 APPLY(s_min_batch_time); 2896 APPLY(s_want_extra_isize); 2897 APPLY(s_inode_readahead_blks); 2898 APPLY(s_max_dir_size_kb); 2899 APPLY(s_li_wait_mult); 2900 APPLY(s_resgid); 2901 APPLY(s_resuid); 2902 2903 #ifdef CONFIG_EXT4_DEBUG 2904 APPLY(s_fc_debug_max_replay); 2905 #endif 2906 2907 ext4_apply_quota_options(fc, sb); 2908 ext4_apply_test_dummy_encryption(ctx, sb); 2909 } 2910 2911 2912 static int ext4_validate_options(struct fs_context *fc) 2913 { 2914 #ifdef CONFIG_QUOTA 2915 struct ext4_fs_context *ctx = fc->fs_private; 2916 char *usr_qf_name, *grp_qf_name; 2917 2918 usr_qf_name = ctx->s_qf_names[USRQUOTA]; 2919 grp_qf_name = ctx->s_qf_names[GRPQUOTA]; 2920 2921 if (usr_qf_name || grp_qf_name) { 2922 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name) 2923 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA); 2924 2925 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name) 2926 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA); 2927 2928 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) || 2929 ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) { 2930 ext4_msg(NULL, KERN_ERR, "old and new quota " 2931 "format mixing"); 2932 return -EINVAL; 2933 } 2934 } 2935 #endif 2936 return 1; 2937 } 2938 2939 static inline void ext4_show_quota_options(struct seq_file *seq, 2940 struct super_block *sb) 2941 { 2942 #if defined(CONFIG_QUOTA) 2943 struct ext4_sb_info *sbi = EXT4_SB(sb); 2944 char *usr_qf_name, *grp_qf_name; 2945 2946 if (sbi->s_jquota_fmt) { 2947 char *fmtname = ""; 2948 2949 switch (sbi->s_jquota_fmt) { 2950 case QFMT_VFS_OLD: 2951 fmtname = "vfsold"; 2952 break; 2953 case QFMT_VFS_V0: 2954 fmtname = "vfsv0"; 2955 break; 2956 case QFMT_VFS_V1: 2957 fmtname = "vfsv1"; 2958 break; 2959 } 2960 seq_printf(seq, ",jqfmt=%s", fmtname); 2961 } 2962 2963 rcu_read_lock(); 2964 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]); 2965 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]); 2966 if (usr_qf_name) 2967 seq_show_option(seq, "usrjquota", usr_qf_name); 2968 if (grp_qf_name) 2969 seq_show_option(seq, "grpjquota", grp_qf_name); 2970 rcu_read_unlock(); 2971 #endif 2972 } 2973 2974 static const char *token2str(int token) 2975 { 2976 const struct fs_parameter_spec *spec; 2977 2978 for (spec = ext4_param_specs; spec->name != NULL; spec++) 2979 if (spec->opt == token && !spec->type) 2980 break; 2981 return spec->name; 2982 } 2983 2984 /* 2985 * Show an option if 2986 * - it's set to a non-default value OR 2987 * - if the per-sb default is different from the global default 2988 */ 2989 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, 2990 int nodefs) 2991 { 2992 struct ext4_sb_info *sbi = EXT4_SB(sb); 2993 struct ext4_super_block *es = sbi->s_es; 2994 int def_errors; 2995 const struct mount_opts *m; 2996 char sep = nodefs ? '\n' : ','; 2997 2998 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) 2999 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) 3000 3001 if (sbi->s_sb_block != 1) 3002 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); 3003 3004 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 3005 int want_set = m->flags & MOPT_SET; 3006 int opt_2 = m->flags & MOPT_2; 3007 unsigned int mount_opt, def_mount_opt; 3008 3009 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || 3010 m->flags & MOPT_SKIP) 3011 continue; 3012 3013 if (opt_2) { 3014 mount_opt = sbi->s_mount_opt2; 3015 def_mount_opt = sbi->s_def_mount_opt2; 3016 } else { 3017 mount_opt = sbi->s_mount_opt; 3018 def_mount_opt = sbi->s_def_mount_opt; 3019 } 3020 /* skip if same as the default */ 3021 if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt))) 3022 continue; 3023 /* select Opt_noFoo vs Opt_Foo */ 3024 if ((want_set && 3025 (mount_opt & m->mount_opt) != m->mount_opt) || 3026 (!want_set && (mount_opt & m->mount_opt))) 3027 continue; 3028 SEQ_OPTS_PRINT("%s", token2str(m->token)); 3029 } 3030 3031 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || 3032 ext4_get_resuid(es) != EXT4_DEF_RESUID) 3033 SEQ_OPTS_PRINT("resuid=%u", 3034 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 3035 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || 3036 ext4_get_resgid(es) != EXT4_DEF_RESGID) 3037 SEQ_OPTS_PRINT("resgid=%u", 3038 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 3039 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); 3040 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) 3041 SEQ_OPTS_PUTS("errors=remount-ro"); 3042 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 3043 SEQ_OPTS_PUTS("errors=continue"); 3044 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 3045 SEQ_OPTS_PUTS("errors=panic"); 3046 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 3047 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); 3048 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) 3049 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); 3050 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) 3051 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); 3052 if (nodefs && sb->s_flags & SB_I_VERSION) 3053 SEQ_OPTS_PUTS("i_version"); 3054 if (nodefs || sbi->s_stripe) 3055 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); 3056 if (nodefs || EXT4_MOUNT_DATA_FLAGS & 3057 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { 3058 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3059 SEQ_OPTS_PUTS("data=journal"); 3060 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3061 SEQ_OPTS_PUTS("data=ordered"); 3062 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 3063 SEQ_OPTS_PUTS("data=writeback"); 3064 } 3065 if (nodefs || 3066 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 3067 SEQ_OPTS_PRINT("inode_readahead_blks=%u", 3068 sbi->s_inode_readahead_blks); 3069 3070 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs || 3071 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) 3072 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); 3073 if (nodefs || sbi->s_max_dir_size_kb) 3074 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); 3075 if (test_opt(sb, DATA_ERR_ABORT)) 3076 SEQ_OPTS_PUTS("data_err=abort"); 3077 3078 fscrypt_show_test_dummy_encryption(seq, sep, sb); 3079 3080 if (sb->s_flags & SB_INLINECRYPT) 3081 SEQ_OPTS_PUTS("inlinecrypt"); 3082 3083 if (test_opt(sb, DAX_ALWAYS)) { 3084 if (IS_EXT2_SB(sb)) 3085 SEQ_OPTS_PUTS("dax"); 3086 else 3087 SEQ_OPTS_PUTS("dax=always"); 3088 } else if (test_opt2(sb, DAX_NEVER)) { 3089 SEQ_OPTS_PUTS("dax=never"); 3090 } else if (test_opt2(sb, DAX_INODE)) { 3091 SEQ_OPTS_PUTS("dax=inode"); 3092 } 3093 3094 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD && 3095 !test_opt2(sb, MB_OPTIMIZE_SCAN)) { 3096 SEQ_OPTS_PUTS("mb_optimize_scan=0"); 3097 } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD && 3098 test_opt2(sb, MB_OPTIMIZE_SCAN)) { 3099 SEQ_OPTS_PUTS("mb_optimize_scan=1"); 3100 } 3101 3102 if (nodefs && !test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) 3103 SEQ_OPTS_PUTS("prefetch_block_bitmaps"); 3104 3105 if (ext4_emergency_ro(sb)) 3106 SEQ_OPTS_PUTS("emergency_ro"); 3107 3108 if (ext4_forced_shutdown(sb)) 3109 SEQ_OPTS_PUTS("shutdown"); 3110 3111 ext4_show_quota_options(seq, sb); 3112 return 0; 3113 } 3114 3115 static int ext4_show_options(struct seq_file *seq, struct dentry *root) 3116 { 3117 return _ext4_show_options(seq, root->d_sb, 0); 3118 } 3119 3120 int ext4_seq_options_show(struct seq_file *seq, void *offset) 3121 { 3122 struct super_block *sb = seq->private; 3123 int rc; 3124 3125 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw"); 3126 rc = _ext4_show_options(seq, sb, 1); 3127 seq_putc(seq, '\n'); 3128 return rc; 3129 } 3130 3131 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 3132 int read_only) 3133 { 3134 struct ext4_sb_info *sbi = EXT4_SB(sb); 3135 int err = 0; 3136 3137 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 3138 ext4_msg(sb, KERN_ERR, "revision level too high, " 3139 "forcing read-only mode"); 3140 err = -EROFS; 3141 goto done; 3142 } 3143 if (read_only) 3144 goto done; 3145 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 3146 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 3147 "running e2fsck is recommended"); 3148 else if (sbi->s_mount_state & EXT4_ERROR_FS) 3149 ext4_msg(sb, KERN_WARNING, 3150 "warning: mounting fs with errors, " 3151 "running e2fsck is recommended"); 3152 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 3153 le16_to_cpu(es->s_mnt_count) >= 3154 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 3155 ext4_msg(sb, KERN_WARNING, 3156 "warning: maximal mount count reached, " 3157 "running e2fsck is recommended"); 3158 else if (le32_to_cpu(es->s_checkinterval) && 3159 (ext4_get_tstamp(es, s_lastcheck) + 3160 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds())) 3161 ext4_msg(sb, KERN_WARNING, 3162 "warning: checktime reached, " 3163 "running e2fsck is recommended"); 3164 if (!sbi->s_journal) 3165 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 3166 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 3167 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 3168 le16_add_cpu(&es->s_mnt_count, 1); 3169 ext4_update_tstamp(es, s_mtime); 3170 if (sbi->s_journal) { 3171 ext4_set_feature_journal_needs_recovery(sb); 3172 if (ext4_has_feature_orphan_file(sb)) 3173 ext4_set_feature_orphan_present(sb); 3174 } 3175 3176 err = ext4_commit_super(sb); 3177 done: 3178 if (test_opt(sb, DEBUG)) 3179 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 3180 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 3181 sb->s_blocksize, 3182 sbi->s_groups_count, 3183 EXT4_BLOCKS_PER_GROUP(sb), 3184 EXT4_INODES_PER_GROUP(sb), 3185 sbi->s_mount_opt, sbi->s_mount_opt2); 3186 return err; 3187 } 3188 3189 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) 3190 { 3191 struct ext4_sb_info *sbi = EXT4_SB(sb); 3192 struct flex_groups **old_groups, **new_groups; 3193 int size, i, j; 3194 3195 if (!sbi->s_log_groups_per_flex) 3196 return 0; 3197 3198 size = ext4_flex_group(sbi, ngroup - 1) + 1; 3199 if (size <= sbi->s_flex_groups_allocated) 3200 return 0; 3201 3202 new_groups = kvzalloc(roundup_pow_of_two(size * 3203 sizeof(*sbi->s_flex_groups)), GFP_KERNEL); 3204 if (!new_groups) { 3205 ext4_msg(sb, KERN_ERR, 3206 "not enough memory for %d flex group pointers", size); 3207 return -ENOMEM; 3208 } 3209 for (i = sbi->s_flex_groups_allocated; i < size; i++) { 3210 new_groups[i] = kvzalloc(roundup_pow_of_two( 3211 sizeof(struct flex_groups)), 3212 GFP_KERNEL); 3213 if (!new_groups[i]) { 3214 for (j = sbi->s_flex_groups_allocated; j < i; j++) 3215 kvfree(new_groups[j]); 3216 kvfree(new_groups); 3217 ext4_msg(sb, KERN_ERR, 3218 "not enough memory for %d flex groups", size); 3219 return -ENOMEM; 3220 } 3221 } 3222 rcu_read_lock(); 3223 old_groups = rcu_dereference(sbi->s_flex_groups); 3224 if (old_groups) 3225 memcpy(new_groups, old_groups, 3226 (sbi->s_flex_groups_allocated * 3227 sizeof(struct flex_groups *))); 3228 rcu_read_unlock(); 3229 rcu_assign_pointer(sbi->s_flex_groups, new_groups); 3230 sbi->s_flex_groups_allocated = size; 3231 if (old_groups) 3232 ext4_kvfree_array_rcu(old_groups); 3233 return 0; 3234 } 3235 3236 static int ext4_fill_flex_info(struct super_block *sb) 3237 { 3238 struct ext4_sb_info *sbi = EXT4_SB(sb); 3239 struct ext4_group_desc *gdp = NULL; 3240 struct flex_groups *fg; 3241 ext4_group_t flex_group; 3242 int i, err; 3243 3244 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 3245 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 3246 sbi->s_log_groups_per_flex = 0; 3247 return 1; 3248 } 3249 3250 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); 3251 if (err) 3252 goto failed; 3253 3254 for (i = 0; i < sbi->s_groups_count; i++) { 3255 gdp = ext4_get_group_desc(sb, i, NULL); 3256 3257 flex_group = ext4_flex_group(sbi, i); 3258 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); 3259 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes); 3260 atomic64_add(ext4_free_group_clusters(sb, gdp), 3261 &fg->free_clusters); 3262 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs); 3263 } 3264 3265 return 1; 3266 failed: 3267 return 0; 3268 } 3269 3270 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, 3271 struct ext4_group_desc *gdp) 3272 { 3273 int offset = offsetof(struct ext4_group_desc, bg_checksum); 3274 __u16 crc = 0; 3275 __le32 le_group = cpu_to_le32(block_group); 3276 struct ext4_sb_info *sbi = EXT4_SB(sb); 3277 3278 if (ext4_has_feature_metadata_csum(sbi->s_sb)) { 3279 /* Use new metadata_csum algorithm */ 3280 __u32 csum32; 3281 __u16 dummy_csum = 0; 3282 3283 csum32 = ext4_chksum(sbi->s_csum_seed, (__u8 *)&le_group, 3284 sizeof(le_group)); 3285 csum32 = ext4_chksum(csum32, (__u8 *)gdp, offset); 3286 csum32 = ext4_chksum(csum32, (__u8 *)&dummy_csum, 3287 sizeof(dummy_csum)); 3288 offset += sizeof(dummy_csum); 3289 if (offset < sbi->s_desc_size) 3290 csum32 = ext4_chksum(csum32, (__u8 *)gdp + offset, 3291 sbi->s_desc_size - offset); 3292 3293 crc = csum32 & 0xFFFF; 3294 goto out; 3295 } 3296 3297 /* old crc16 code */ 3298 if (!ext4_has_feature_gdt_csum(sb)) 3299 return 0; 3300 3301 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 3302 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 3303 crc = crc16(crc, (__u8 *)gdp, offset); 3304 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 3305 /* for checksum of struct ext4_group_desc do the rest...*/ 3306 if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size) 3307 crc = crc16(crc, (__u8 *)gdp + offset, 3308 sbi->s_desc_size - offset); 3309 3310 out: 3311 return cpu_to_le16(crc); 3312 } 3313 3314 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, 3315 struct ext4_group_desc *gdp) 3316 { 3317 if (ext4_has_group_desc_csum(sb) && 3318 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) 3319 return 0; 3320 3321 return 1; 3322 } 3323 3324 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, 3325 struct ext4_group_desc *gdp) 3326 { 3327 if (!ext4_has_group_desc_csum(sb)) 3328 return; 3329 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); 3330 } 3331 3332 /* Called at mount-time, super-block is locked */ 3333 static int ext4_check_descriptors(struct super_block *sb, 3334 ext4_fsblk_t sb_block, 3335 ext4_group_t *first_not_zeroed) 3336 { 3337 struct ext4_sb_info *sbi = EXT4_SB(sb); 3338 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 3339 ext4_fsblk_t last_block; 3340 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0); 3341 ext4_fsblk_t block_bitmap; 3342 ext4_fsblk_t inode_bitmap; 3343 ext4_fsblk_t inode_table; 3344 int flexbg_flag = 0; 3345 ext4_group_t i, grp = sbi->s_groups_count; 3346 3347 if (ext4_has_feature_flex_bg(sb)) 3348 flexbg_flag = 1; 3349 3350 ext4_debug("Checking group descriptors"); 3351 3352 for (i = 0; i < sbi->s_groups_count; i++) { 3353 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 3354 3355 if (i == sbi->s_groups_count - 1 || flexbg_flag) 3356 last_block = ext4_blocks_count(sbi->s_es) - 1; 3357 else 3358 last_block = first_block + 3359 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 3360 3361 if ((grp == sbi->s_groups_count) && 3362 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 3363 grp = i; 3364 3365 block_bitmap = ext4_block_bitmap(sb, gdp); 3366 if (block_bitmap == sb_block) { 3367 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3368 "Block bitmap for group %u overlaps " 3369 "superblock", i); 3370 if (!sb_rdonly(sb)) 3371 return 0; 3372 } 3373 if (block_bitmap >= sb_block + 1 && 3374 block_bitmap <= last_bg_block) { 3375 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3376 "Block bitmap for group %u overlaps " 3377 "block group descriptors", i); 3378 if (!sb_rdonly(sb)) 3379 return 0; 3380 } 3381 if (block_bitmap < first_block || block_bitmap > last_block) { 3382 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3383 "Block bitmap for group %u not in group " 3384 "(block %llu)!", i, block_bitmap); 3385 return 0; 3386 } 3387 inode_bitmap = ext4_inode_bitmap(sb, gdp); 3388 if (inode_bitmap == sb_block) { 3389 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3390 "Inode bitmap for group %u overlaps " 3391 "superblock", i); 3392 if (!sb_rdonly(sb)) 3393 return 0; 3394 } 3395 if (inode_bitmap >= sb_block + 1 && 3396 inode_bitmap <= last_bg_block) { 3397 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3398 "Inode bitmap for group %u overlaps " 3399 "block group descriptors", i); 3400 if (!sb_rdonly(sb)) 3401 return 0; 3402 } 3403 if (inode_bitmap < first_block || inode_bitmap > last_block) { 3404 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3405 "Inode bitmap for group %u not in group " 3406 "(block %llu)!", i, inode_bitmap); 3407 return 0; 3408 } 3409 inode_table = ext4_inode_table(sb, gdp); 3410 if (inode_table == sb_block) { 3411 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3412 "Inode table for group %u overlaps " 3413 "superblock", i); 3414 if (!sb_rdonly(sb)) 3415 return 0; 3416 } 3417 if (inode_table >= sb_block + 1 && 3418 inode_table <= last_bg_block) { 3419 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3420 "Inode table for group %u overlaps " 3421 "block group descriptors", i); 3422 if (!sb_rdonly(sb)) 3423 return 0; 3424 } 3425 if (inode_table < first_block || 3426 inode_table + sbi->s_itb_per_group - 1 > last_block) { 3427 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3428 "Inode table for group %u not in group " 3429 "(block %llu)!", i, inode_table); 3430 return 0; 3431 } 3432 ext4_lock_group(sb, i); 3433 if (!ext4_group_desc_csum_verify(sb, i, gdp)) { 3434 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 3435 "Checksum for group %u failed (%u!=%u)", 3436 i, le16_to_cpu(ext4_group_desc_csum(sb, i, 3437 gdp)), le16_to_cpu(gdp->bg_checksum)); 3438 if (!sb_rdonly(sb)) { 3439 ext4_unlock_group(sb, i); 3440 return 0; 3441 } 3442 } 3443 ext4_unlock_group(sb, i); 3444 if (!flexbg_flag) 3445 first_block += EXT4_BLOCKS_PER_GROUP(sb); 3446 } 3447 if (NULL != first_not_zeroed) 3448 *first_not_zeroed = grp; 3449 return 1; 3450 } 3451 3452 /* 3453 * Maximal extent format file size. 3454 * Resulting logical blkno at s_maxbytes must fit in our on-disk 3455 * extent format containers, within a sector_t, and within i_blocks 3456 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 3457 * so that won't be a limiting factor. 3458 * 3459 * However there is other limiting factor. We do store extents in the form 3460 * of starting block and length, hence the resulting length of the extent 3461 * covering maximum file size must fit into on-disk format containers as 3462 * well. Given that length is always by 1 unit bigger than max unit (because 3463 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 3464 * 3465 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 3466 */ 3467 static loff_t ext4_max_size(int blkbits, int has_huge_files) 3468 { 3469 loff_t res; 3470 loff_t upper_limit = MAX_LFS_FILESIZE; 3471 3472 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64)); 3473 3474 if (!has_huge_files) { 3475 upper_limit = (1LL << 32) - 1; 3476 3477 /* total blocks in file system block size */ 3478 upper_limit >>= (blkbits - 9); 3479 upper_limit <<= blkbits; 3480 } 3481 3482 /* 3483 * 32-bit extent-start container, ee_block. We lower the maxbytes 3484 * by one fs block, so ee_len can cover the extent of maximum file 3485 * size 3486 */ 3487 res = (1LL << 32) - 1; 3488 res <<= blkbits; 3489 3490 /* Sanity check against vm- & vfs- imposed limits */ 3491 if (res > upper_limit) 3492 res = upper_limit; 3493 3494 return res; 3495 } 3496 3497 /* 3498 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 3499 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 3500 * We need to be 1 filesystem block less than the 2^48 sector limit. 3501 */ 3502 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 3503 { 3504 loff_t upper_limit, res = EXT4_NDIR_BLOCKS; 3505 int meta_blocks; 3506 unsigned int ppb = 1 << (bits - 2); 3507 3508 /* 3509 * This is calculated to be the largest file size for a dense, block 3510 * mapped file such that the file's total number of 512-byte sectors, 3511 * including data and all indirect blocks, does not exceed (2^48 - 1). 3512 * 3513 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 3514 * number of 512-byte sectors of the file. 3515 */ 3516 if (!has_huge_files) { 3517 /* 3518 * !has_huge_files or implies that the inode i_block field 3519 * represents total file blocks in 2^32 512-byte sectors == 3520 * size of vfs inode i_blocks * 8 3521 */ 3522 upper_limit = (1LL << 32) - 1; 3523 3524 /* total blocks in file system block size */ 3525 upper_limit >>= (bits - 9); 3526 3527 } else { 3528 /* 3529 * We use 48 bit ext4_inode i_blocks 3530 * With EXT4_HUGE_FILE_FL set the i_blocks 3531 * represent total number of blocks in 3532 * file system block size 3533 */ 3534 upper_limit = (1LL << 48) - 1; 3535 3536 } 3537 3538 /* Compute how many blocks we can address by block tree */ 3539 res += ppb; 3540 res += ppb * ppb; 3541 res += ((loff_t)ppb) * ppb * ppb; 3542 /* Compute how many metadata blocks are needed */ 3543 meta_blocks = 1; 3544 meta_blocks += 1 + ppb; 3545 meta_blocks += 1 + ppb + ppb * ppb; 3546 /* Does block tree limit file size? */ 3547 if (res + meta_blocks <= upper_limit) 3548 goto check_lfs; 3549 3550 res = upper_limit; 3551 /* How many metadata blocks are needed for addressing upper_limit? */ 3552 upper_limit -= EXT4_NDIR_BLOCKS; 3553 /* indirect blocks */ 3554 meta_blocks = 1; 3555 upper_limit -= ppb; 3556 /* double indirect blocks */ 3557 if (upper_limit < ppb * ppb) { 3558 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb); 3559 res -= meta_blocks; 3560 goto check_lfs; 3561 } 3562 meta_blocks += 1 + ppb; 3563 upper_limit -= ppb * ppb; 3564 /* tripple indirect blocks for the rest */ 3565 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) + 3566 DIV_ROUND_UP_ULL(upper_limit, ppb*ppb); 3567 res -= meta_blocks; 3568 check_lfs: 3569 res <<= bits; 3570 if (res > MAX_LFS_FILESIZE) 3571 res = MAX_LFS_FILESIZE; 3572 3573 return res; 3574 } 3575 3576 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 3577 ext4_fsblk_t logical_sb_block, int nr) 3578 { 3579 struct ext4_sb_info *sbi = EXT4_SB(sb); 3580 ext4_group_t bg, first_meta_bg; 3581 int has_super = 0; 3582 3583 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 3584 3585 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg) 3586 return logical_sb_block + nr + 1; 3587 bg = sbi->s_desc_per_block * nr; 3588 if (ext4_bg_has_super(sb, bg)) 3589 has_super = 1; 3590 3591 /* 3592 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at 3593 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled 3594 * on modern mke2fs or blksize > 1k on older mke2fs) then we must 3595 * compensate. 3596 */ 3597 if (sb->s_blocksize == 1024 && nr == 0 && 3598 le32_to_cpu(sbi->s_es->s_first_data_block) == 0) 3599 has_super++; 3600 3601 return (has_super + ext4_group_first_block_no(sb, bg)); 3602 } 3603 3604 /** 3605 * ext4_get_stripe_size: Get the stripe size. 3606 * @sbi: In memory super block info 3607 * 3608 * If we have specified it via mount option, then 3609 * use the mount option value. If the value specified at mount time is 3610 * greater than the blocks per group use the super block value. 3611 * If the super block value is greater than blocks per group return 0. 3612 * Allocator needs it be less than blocks per group. 3613 * 3614 */ 3615 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 3616 { 3617 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 3618 unsigned long stripe_width = 3619 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 3620 int ret; 3621 3622 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 3623 ret = sbi->s_stripe; 3624 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group) 3625 ret = stripe_width; 3626 else if (stride && stride <= sbi->s_blocks_per_group) 3627 ret = stride; 3628 else 3629 ret = 0; 3630 3631 /* 3632 * If the stripe width is 1, this makes no sense and 3633 * we set it to 0 to turn off stripe handling code. 3634 */ 3635 if (ret <= 1) 3636 ret = 0; 3637 3638 return ret; 3639 } 3640 3641 /* 3642 * Check whether this filesystem can be mounted based on 3643 * the features present and the RDONLY/RDWR mount requested. 3644 * Returns 1 if this filesystem can be mounted as requested, 3645 * 0 if it cannot be. 3646 */ 3647 int ext4_feature_set_ok(struct super_block *sb, int readonly) 3648 { 3649 if (ext4_has_unknown_ext4_incompat_features(sb)) { 3650 ext4_msg(sb, KERN_ERR, 3651 "Couldn't mount because of " 3652 "unsupported optional features (%x)", 3653 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 3654 ~EXT4_FEATURE_INCOMPAT_SUPP)); 3655 return 0; 3656 } 3657 3658 if (!IS_ENABLED(CONFIG_UNICODE) && ext4_has_feature_casefold(sb)) { 3659 ext4_msg(sb, KERN_ERR, 3660 "Filesystem with casefold feature cannot be " 3661 "mounted without CONFIG_UNICODE"); 3662 return 0; 3663 } 3664 3665 if (readonly) 3666 return 1; 3667 3668 if (ext4_has_feature_readonly(sb)) { 3669 ext4_msg(sb, KERN_INFO, "filesystem is read-only"); 3670 sb->s_flags |= SB_RDONLY; 3671 return 1; 3672 } 3673 3674 /* Check that feature set is OK for a read-write mount */ 3675 if (ext4_has_unknown_ext4_ro_compat_features(sb)) { 3676 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 3677 "unsupported optional features (%x)", 3678 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 3679 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 3680 return 0; 3681 } 3682 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) { 3683 ext4_msg(sb, KERN_ERR, 3684 "Can't support bigalloc feature without " 3685 "extents feature\n"); 3686 return 0; 3687 } 3688 if (ext4_has_feature_bigalloc(sb) && 3689 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { 3690 ext4_msg(sb, KERN_WARNING, 3691 "bad geometry: bigalloc file system with non-zero " 3692 "first_data_block\n"); 3693 return 0; 3694 } 3695 3696 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2) 3697 if (!readonly && (ext4_has_feature_quota(sb) || 3698 ext4_has_feature_project(sb))) { 3699 ext4_msg(sb, KERN_ERR, 3700 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2"); 3701 return 0; 3702 } 3703 #endif /* CONFIG_QUOTA */ 3704 return 1; 3705 } 3706 3707 /* 3708 * This function is called once a day by default if we have errors logged 3709 * on the file system. 3710 * Use the err_report_sec sysfs attribute to disable or adjust its call 3711 * freequency. 3712 */ 3713 void print_daily_error_info(struct timer_list *t) 3714 { 3715 struct ext4_sb_info *sbi = timer_container_of(sbi, t, s_err_report); 3716 struct super_block *sb = sbi->s_sb; 3717 struct ext4_super_block *es = sbi->s_es; 3718 3719 if (es->s_error_count) 3720 /* fsck newer than v1.41.13 is needed to clean this condition. */ 3721 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", 3722 le32_to_cpu(es->s_error_count)); 3723 if (es->s_first_error_time) { 3724 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d", 3725 sb->s_id, 3726 ext4_get_tstamp(es, s_first_error_time), 3727 (int) sizeof(es->s_first_error_func), 3728 es->s_first_error_func, 3729 le32_to_cpu(es->s_first_error_line)); 3730 if (es->s_first_error_ino) 3731 printk(KERN_CONT ": inode %u", 3732 le32_to_cpu(es->s_first_error_ino)); 3733 if (es->s_first_error_block) 3734 printk(KERN_CONT ": block %llu", (unsigned long long) 3735 le64_to_cpu(es->s_first_error_block)); 3736 printk(KERN_CONT "\n"); 3737 } 3738 if (es->s_last_error_time) { 3739 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d", 3740 sb->s_id, 3741 ext4_get_tstamp(es, s_last_error_time), 3742 (int) sizeof(es->s_last_error_func), 3743 es->s_last_error_func, 3744 le32_to_cpu(es->s_last_error_line)); 3745 if (es->s_last_error_ino) 3746 printk(KERN_CONT ": inode %u", 3747 le32_to_cpu(es->s_last_error_ino)); 3748 if (es->s_last_error_block) 3749 printk(KERN_CONT ": block %llu", (unsigned long long) 3750 le64_to_cpu(es->s_last_error_block)); 3751 printk(KERN_CONT "\n"); 3752 } 3753 3754 if (sbi->s_err_report_sec) 3755 mod_timer(&sbi->s_err_report, jiffies + secs_to_jiffies(sbi->s_err_report_sec)); 3756 } 3757 3758 /* Find next suitable group and run ext4_init_inode_table */ 3759 static int ext4_run_li_request(struct ext4_li_request *elr) 3760 { 3761 struct ext4_group_desc *gdp = NULL; 3762 struct super_block *sb = elr->lr_super; 3763 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3764 ext4_group_t group = elr->lr_next_group; 3765 unsigned int prefetch_ios = 0; 3766 int ret = 0; 3767 int nr = EXT4_SB(sb)->s_mb_prefetch; 3768 u64 start_time; 3769 3770 if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) { 3771 elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios); 3772 ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr); 3773 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr); 3774 if (group >= elr->lr_next_group) { 3775 ret = 1; 3776 if (elr->lr_first_not_zeroed != ngroups && 3777 !ext4_emergency_state(sb) && !sb_rdonly(sb) && 3778 test_opt(sb, INIT_INODE_TABLE)) { 3779 elr->lr_next_group = elr->lr_first_not_zeroed; 3780 elr->lr_mode = EXT4_LI_MODE_ITABLE; 3781 ret = 0; 3782 } 3783 } 3784 return ret; 3785 } 3786 3787 for (; group < ngroups; group++) { 3788 gdp = ext4_get_group_desc(sb, group, NULL); 3789 if (!gdp) { 3790 ret = 1; 3791 break; 3792 } 3793 3794 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 3795 break; 3796 } 3797 3798 if (group >= ngroups) 3799 ret = 1; 3800 3801 if (!ret) { 3802 start_time = ktime_get_ns(); 3803 ret = ext4_init_inode_table(sb, group, 3804 elr->lr_timeout ? 0 : 1); 3805 trace_ext4_lazy_itable_init(sb, group); 3806 if (elr->lr_timeout == 0) { 3807 elr->lr_timeout = nsecs_to_jiffies((ktime_get_ns() - start_time) * 3808 EXT4_SB(elr->lr_super)->s_li_wait_mult); 3809 } 3810 elr->lr_next_sched = jiffies + elr->lr_timeout; 3811 elr->lr_next_group = group + 1; 3812 } 3813 return ret; 3814 } 3815 3816 /* 3817 * Remove lr_request from the list_request and free the 3818 * request structure. Should be called with li_list_mtx held 3819 */ 3820 static void ext4_remove_li_request(struct ext4_li_request *elr) 3821 { 3822 if (!elr) 3823 return; 3824 3825 list_del(&elr->lr_request); 3826 EXT4_SB(elr->lr_super)->s_li_request = NULL; 3827 kfree(elr); 3828 } 3829 3830 static void ext4_unregister_li_request(struct super_block *sb) 3831 { 3832 mutex_lock(&ext4_li_mtx); 3833 if (!ext4_li_info) { 3834 mutex_unlock(&ext4_li_mtx); 3835 return; 3836 } 3837 3838 mutex_lock(&ext4_li_info->li_list_mtx); 3839 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 3840 mutex_unlock(&ext4_li_info->li_list_mtx); 3841 mutex_unlock(&ext4_li_mtx); 3842 } 3843 3844 static struct task_struct *ext4_lazyinit_task; 3845 3846 /* 3847 * This is the function where ext4lazyinit thread lives. It walks 3848 * through the request list searching for next scheduled filesystem. 3849 * When such a fs is found, run the lazy initialization request 3850 * (ext4_rn_li_request) and keep track of the time spend in this 3851 * function. Based on that time we compute next schedule time of 3852 * the request. When walking through the list is complete, compute 3853 * next waking time and put itself into sleep. 3854 */ 3855 static int ext4_lazyinit_thread(void *arg) 3856 { 3857 struct ext4_lazy_init *eli = arg; 3858 struct list_head *pos, *n; 3859 struct ext4_li_request *elr; 3860 unsigned long next_wakeup, cur; 3861 3862 BUG_ON(NULL == eli); 3863 set_freezable(); 3864 3865 cont_thread: 3866 while (true) { 3867 bool next_wakeup_initialized = false; 3868 3869 next_wakeup = 0; 3870 mutex_lock(&eli->li_list_mtx); 3871 if (list_empty(&eli->li_request_list)) { 3872 mutex_unlock(&eli->li_list_mtx); 3873 goto exit_thread; 3874 } 3875 list_for_each_safe(pos, n, &eli->li_request_list) { 3876 int err = 0; 3877 int progress = 0; 3878 elr = list_entry(pos, struct ext4_li_request, 3879 lr_request); 3880 3881 if (time_before(jiffies, elr->lr_next_sched)) { 3882 if (!next_wakeup_initialized || 3883 time_before(elr->lr_next_sched, next_wakeup)) { 3884 next_wakeup = elr->lr_next_sched; 3885 next_wakeup_initialized = true; 3886 } 3887 continue; 3888 } 3889 if (down_read_trylock(&elr->lr_super->s_umount)) { 3890 if (sb_start_write_trylock(elr->lr_super)) { 3891 progress = 1; 3892 /* 3893 * We hold sb->s_umount, sb can not 3894 * be removed from the list, it is 3895 * now safe to drop li_list_mtx 3896 */ 3897 mutex_unlock(&eli->li_list_mtx); 3898 err = ext4_run_li_request(elr); 3899 sb_end_write(elr->lr_super); 3900 mutex_lock(&eli->li_list_mtx); 3901 n = pos->next; 3902 } 3903 up_read((&elr->lr_super->s_umount)); 3904 } 3905 /* error, remove the lazy_init job */ 3906 if (err) { 3907 ext4_remove_li_request(elr); 3908 continue; 3909 } 3910 if (!progress) { 3911 elr->lr_next_sched = jiffies + 3912 get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ); 3913 } 3914 if (!next_wakeup_initialized || 3915 time_before(elr->lr_next_sched, next_wakeup)) { 3916 next_wakeup = elr->lr_next_sched; 3917 next_wakeup_initialized = true; 3918 } 3919 } 3920 mutex_unlock(&eli->li_list_mtx); 3921 3922 try_to_freeze(); 3923 3924 cur = jiffies; 3925 if (!next_wakeup_initialized || time_after_eq(cur, next_wakeup)) { 3926 cond_resched(); 3927 continue; 3928 } 3929 3930 schedule_timeout_interruptible(next_wakeup - cur); 3931 3932 if (kthread_should_stop()) { 3933 ext4_clear_request_list(); 3934 goto exit_thread; 3935 } 3936 } 3937 3938 exit_thread: 3939 /* 3940 * It looks like the request list is empty, but we need 3941 * to check it under the li_list_mtx lock, to prevent any 3942 * additions into it, and of course we should lock ext4_li_mtx 3943 * to atomically free the list and ext4_li_info, because at 3944 * this point another ext4 filesystem could be registering 3945 * new one. 3946 */ 3947 mutex_lock(&ext4_li_mtx); 3948 mutex_lock(&eli->li_list_mtx); 3949 if (!list_empty(&eli->li_request_list)) { 3950 mutex_unlock(&eli->li_list_mtx); 3951 mutex_unlock(&ext4_li_mtx); 3952 goto cont_thread; 3953 } 3954 mutex_unlock(&eli->li_list_mtx); 3955 kfree(ext4_li_info); 3956 ext4_li_info = NULL; 3957 mutex_unlock(&ext4_li_mtx); 3958 3959 return 0; 3960 } 3961 3962 static void ext4_clear_request_list(void) 3963 { 3964 struct list_head *pos, *n; 3965 struct ext4_li_request *elr; 3966 3967 mutex_lock(&ext4_li_info->li_list_mtx); 3968 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 3969 elr = list_entry(pos, struct ext4_li_request, 3970 lr_request); 3971 ext4_remove_li_request(elr); 3972 } 3973 mutex_unlock(&ext4_li_info->li_list_mtx); 3974 } 3975 3976 static int ext4_run_lazyinit_thread(void) 3977 { 3978 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 3979 ext4_li_info, "ext4lazyinit"); 3980 if (IS_ERR(ext4_lazyinit_task)) { 3981 int err = PTR_ERR(ext4_lazyinit_task); 3982 ext4_clear_request_list(); 3983 kfree(ext4_li_info); 3984 ext4_li_info = NULL; 3985 printk(KERN_CRIT "EXT4-fs: error %d creating inode table " 3986 "initialization thread\n", 3987 err); 3988 return err; 3989 } 3990 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 3991 return 0; 3992 } 3993 3994 /* 3995 * Check whether it make sense to run itable init. thread or not. 3996 * If there is at least one uninitialized inode table, return 3997 * corresponding group number, else the loop goes through all 3998 * groups and return total number of groups. 3999 */ 4000 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 4001 { 4002 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 4003 struct ext4_group_desc *gdp = NULL; 4004 4005 if (!ext4_has_group_desc_csum(sb)) 4006 return ngroups; 4007 4008 for (group = 0; group < ngroups; group++) { 4009 gdp = ext4_get_group_desc(sb, group, NULL); 4010 if (!gdp) 4011 continue; 4012 4013 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 4014 break; 4015 } 4016 4017 return group; 4018 } 4019 4020 static int ext4_li_info_new(void) 4021 { 4022 struct ext4_lazy_init *eli = NULL; 4023 4024 eli = kzalloc_obj(*eli); 4025 if (!eli) 4026 return -ENOMEM; 4027 4028 INIT_LIST_HEAD(&eli->li_request_list); 4029 mutex_init(&eli->li_list_mtx); 4030 4031 eli->li_state |= EXT4_LAZYINIT_QUIT; 4032 4033 ext4_li_info = eli; 4034 4035 return 0; 4036 } 4037 4038 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 4039 ext4_group_t start) 4040 { 4041 struct ext4_li_request *elr; 4042 4043 elr = kzalloc_obj(*elr); 4044 if (!elr) 4045 return NULL; 4046 4047 elr->lr_super = sb; 4048 elr->lr_first_not_zeroed = start; 4049 if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) { 4050 elr->lr_mode = EXT4_LI_MODE_ITABLE; 4051 elr->lr_next_group = start; 4052 } else { 4053 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP; 4054 } 4055 4056 /* 4057 * Randomize first schedule time of the request to 4058 * spread the inode table initialization requests 4059 * better. 4060 */ 4061 elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ); 4062 return elr; 4063 } 4064 4065 int ext4_register_li_request(struct super_block *sb, 4066 ext4_group_t first_not_zeroed) 4067 { 4068 struct ext4_sb_info *sbi = EXT4_SB(sb); 4069 struct ext4_li_request *elr = NULL; 4070 ext4_group_t ngroups = sbi->s_groups_count; 4071 int ret = 0; 4072 4073 mutex_lock(&ext4_li_mtx); 4074 if (sbi->s_li_request != NULL) { 4075 /* 4076 * Reset timeout so it can be computed again, because 4077 * s_li_wait_mult might have changed. 4078 */ 4079 sbi->s_li_request->lr_timeout = 0; 4080 goto out; 4081 } 4082 4083 if (ext4_emergency_state(sb) || sb_rdonly(sb) || 4084 (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) && 4085 (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE)))) 4086 goto out; 4087 4088 elr = ext4_li_request_new(sb, first_not_zeroed); 4089 if (!elr) { 4090 ret = -ENOMEM; 4091 goto out; 4092 } 4093 4094 if (NULL == ext4_li_info) { 4095 ret = ext4_li_info_new(); 4096 if (ret) 4097 goto out; 4098 } 4099 4100 mutex_lock(&ext4_li_info->li_list_mtx); 4101 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 4102 mutex_unlock(&ext4_li_info->li_list_mtx); 4103 4104 sbi->s_li_request = elr; 4105 /* 4106 * set elr to NULL here since it has been inserted to 4107 * the request_list and the removal and free of it is 4108 * handled by ext4_clear_request_list from now on. 4109 */ 4110 elr = NULL; 4111 4112 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 4113 ret = ext4_run_lazyinit_thread(); 4114 if (ret) 4115 goto out; 4116 } 4117 out: 4118 mutex_unlock(&ext4_li_mtx); 4119 if (ret) 4120 kfree(elr); 4121 return ret; 4122 } 4123 4124 /* 4125 * We do not need to lock anything since this is called on 4126 * module unload. 4127 */ 4128 static void ext4_destroy_lazyinit_thread(void) 4129 { 4130 /* 4131 * If thread exited earlier 4132 * there's nothing to be done. 4133 */ 4134 if (!ext4_li_info || !ext4_lazyinit_task) 4135 return; 4136 4137 kthread_stop(ext4_lazyinit_task); 4138 } 4139 4140 static int set_journal_csum_feature_set(struct super_block *sb) 4141 { 4142 int ret = 1; 4143 int compat, incompat; 4144 struct ext4_sb_info *sbi = EXT4_SB(sb); 4145 4146 if (ext4_has_feature_metadata_csum(sb)) { 4147 /* journal checksum v3 */ 4148 compat = 0; 4149 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; 4150 } else { 4151 /* journal checksum v1 */ 4152 compat = JBD2_FEATURE_COMPAT_CHECKSUM; 4153 incompat = 0; 4154 } 4155 4156 jbd2_journal_clear_features(sbi->s_journal, 4157 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 4158 JBD2_FEATURE_INCOMPAT_CSUM_V3 | 4159 JBD2_FEATURE_INCOMPAT_CSUM_V2); 4160 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 4161 ret = jbd2_journal_set_features(sbi->s_journal, 4162 compat, 0, 4163 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 4164 incompat); 4165 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 4166 ret = jbd2_journal_set_features(sbi->s_journal, 4167 compat, 0, 4168 incompat); 4169 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 4170 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 4171 } else { 4172 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 4173 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 4174 } 4175 4176 return ret; 4177 } 4178 4179 /* 4180 * Note: calculating the overhead so we can be compatible with 4181 * historical BSD practice is quite difficult in the face of 4182 * clusters/bigalloc. This is because multiple metadata blocks from 4183 * different block group can end up in the same allocation cluster. 4184 * Calculating the exact overhead in the face of clustered allocation 4185 * requires either O(all block bitmaps) in memory or O(number of block 4186 * groups**2) in time. We will still calculate the superblock for 4187 * older file systems --- and if we come across with a bigalloc file 4188 * system with zero in s_overhead_clusters the estimate will be close to 4189 * correct especially for very large cluster sizes --- but for newer 4190 * file systems, it's better to calculate this figure once at mkfs 4191 * time, and store it in the superblock. If the superblock value is 4192 * present (even for non-bigalloc file systems), we will use it. 4193 */ 4194 static int count_overhead(struct super_block *sb, ext4_group_t grp, 4195 char *buf) 4196 { 4197 struct ext4_sb_info *sbi = EXT4_SB(sb); 4198 struct ext4_group_desc *gdp; 4199 ext4_fsblk_t first_block, last_block, b; 4200 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 4201 int s, j, count = 0; 4202 int has_super = ext4_bg_has_super(sb, grp); 4203 4204 if (!ext4_has_feature_bigalloc(sb)) 4205 return (has_super + ext4_bg_num_gdb(sb, grp) + 4206 (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) + 4207 sbi->s_itb_per_group + 2); 4208 4209 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + 4210 (grp * EXT4_BLOCKS_PER_GROUP(sb)); 4211 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; 4212 for (i = 0; i < ngroups; i++) { 4213 gdp = ext4_get_group_desc(sb, i, NULL); 4214 b = ext4_block_bitmap(sb, gdp); 4215 if (b >= first_block && b <= last_block) { 4216 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 4217 count++; 4218 } 4219 b = ext4_inode_bitmap(sb, gdp); 4220 if (b >= first_block && b <= last_block) { 4221 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 4222 count++; 4223 } 4224 b = ext4_inode_table(sb, gdp); 4225 if (b >= first_block && b + sbi->s_itb_per_group <= last_block) 4226 for (j = 0; j < sbi->s_itb_per_group; j++, b++) { 4227 int c = EXT4_B2C(sbi, b - first_block); 4228 ext4_set_bit(c, buf); 4229 count++; 4230 } 4231 if (i != grp) 4232 continue; 4233 s = 0; 4234 if (ext4_bg_has_super(sb, grp)) { 4235 ext4_set_bit(s++, buf); 4236 count++; 4237 } 4238 j = ext4_bg_num_gdb(sb, grp); 4239 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) { 4240 ext4_error(sb, "Invalid number of block group " 4241 "descriptor blocks: %d", j); 4242 j = EXT4_BLOCKS_PER_GROUP(sb) - s; 4243 } 4244 count += j; 4245 for (; j > 0; j--) 4246 ext4_set_bit(EXT4_B2C(sbi, s++), buf); 4247 } 4248 if (!count) 4249 return 0; 4250 return EXT4_CLUSTERS_PER_GROUP(sb) - 4251 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); 4252 } 4253 4254 /* 4255 * Compute the overhead and stash it in sbi->s_overhead 4256 */ 4257 int ext4_calculate_overhead(struct super_block *sb) 4258 { 4259 struct ext4_sb_info *sbi = EXT4_SB(sb); 4260 struct ext4_super_block *es = sbi->s_es; 4261 struct inode *j_inode; 4262 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum); 4263 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 4264 ext4_fsblk_t overhead = 0; 4265 char *buf = kvmalloc(sb->s_blocksize, GFP_NOFS | __GFP_ZERO); 4266 4267 if (!buf) 4268 return -ENOMEM; 4269 4270 /* 4271 * Compute the overhead (FS structures). This is constant 4272 * for a given filesystem unless the number of block groups 4273 * changes so we cache the previous value until it does. 4274 */ 4275 4276 /* 4277 * All of the blocks before first_data_block are overhead 4278 */ 4279 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 4280 4281 /* 4282 * Add the overhead found in each block group 4283 */ 4284 for (i = 0; i < ngroups; i++) { 4285 int blks; 4286 4287 blks = count_overhead(sb, i, buf); 4288 overhead += blks; 4289 if (blks) 4290 memset(buf, 0, sb->s_blocksize); 4291 cond_resched(); 4292 } 4293 4294 /* 4295 * Add the internal journal blocks whether the journal has been 4296 * loaded or not 4297 */ 4298 if (sbi->s_journal && !sbi->s_journal_bdev_file) 4299 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len); 4300 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) { 4301 /* j_inum for internal journal is non-zero */ 4302 j_inode = ext4_get_journal_inode(sb, j_inum); 4303 if (!IS_ERR(j_inode)) { 4304 j_blocks = j_inode->i_size >> sb->s_blocksize_bits; 4305 overhead += EXT4_NUM_B2C(sbi, j_blocks); 4306 iput(j_inode); 4307 } else { 4308 ext4_msg(sb, KERN_ERR, "can't get journal size"); 4309 } 4310 } 4311 sbi->s_overhead = overhead; 4312 smp_wmb(); 4313 kvfree(buf); 4314 return 0; 4315 } 4316 4317 static void ext4_set_resv_clusters(struct super_block *sb) 4318 { 4319 ext4_fsblk_t resv_clusters; 4320 struct ext4_sb_info *sbi = EXT4_SB(sb); 4321 4322 /* 4323 * There's no need to reserve anything when we aren't using extents. 4324 * The space estimates are exact, there are no unwritten extents, 4325 * hole punching doesn't need new metadata... This is needed especially 4326 * to keep ext2/3 backward compatibility. 4327 */ 4328 if (!ext4_has_feature_extents(sb)) 4329 return; 4330 /* 4331 * By default we reserve 2% or 4096 clusters, whichever is smaller. 4332 * This should cover the situations where we can not afford to run 4333 * out of space like for example punch hole, or converting 4334 * unwritten extents in delalloc path. In most cases such 4335 * allocation would require 1, or 2 blocks, higher numbers are 4336 * very rare. 4337 */ 4338 resv_clusters = (ext4_blocks_count(sbi->s_es) >> 4339 sbi->s_cluster_bits); 4340 4341 do_div(resv_clusters, 50); 4342 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); 4343 4344 atomic64_set(&sbi->s_resv_clusters, resv_clusters); 4345 } 4346 4347 static const char *ext4_quota_mode(struct super_block *sb) 4348 { 4349 #ifdef CONFIG_QUOTA 4350 if (!ext4_quota_capable(sb)) 4351 return "none"; 4352 4353 if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb)) 4354 return "journalled"; 4355 else 4356 return "writeback"; 4357 #else 4358 return "disabled"; 4359 #endif 4360 } 4361 4362 static void ext4_setup_csum_trigger(struct super_block *sb, 4363 enum ext4_journal_trigger_type type, 4364 void (*trigger)( 4365 struct jbd2_buffer_trigger_type *type, 4366 struct buffer_head *bh, 4367 void *mapped_data, 4368 size_t size)) 4369 { 4370 struct ext4_sb_info *sbi = EXT4_SB(sb); 4371 4372 sbi->s_journal_triggers[type].sb = sb; 4373 sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger; 4374 } 4375 4376 static void ext4_free_sbi(struct ext4_sb_info *sbi) 4377 { 4378 if (!sbi) 4379 return; 4380 4381 kfree(sbi->s_blockgroup_lock); 4382 fs_put_dax(sbi->s_daxdev, NULL); 4383 kfree(sbi); 4384 } 4385 4386 static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb) 4387 { 4388 struct ext4_sb_info *sbi; 4389 4390 sbi = kzalloc_obj(*sbi); 4391 if (!sbi) 4392 return NULL; 4393 4394 sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off, 4395 NULL, NULL); 4396 4397 sbi->s_blockgroup_lock = 4398 kzalloc_obj(struct blockgroup_lock); 4399 4400 if (!sbi->s_blockgroup_lock) 4401 goto err_out; 4402 4403 sb->s_fs_info = sbi; 4404 sbi->s_sb = sb; 4405 return sbi; 4406 err_out: 4407 fs_put_dax(sbi->s_daxdev, NULL); 4408 kfree(sbi); 4409 return NULL; 4410 } 4411 4412 static void ext4_set_def_opts(struct super_block *sb, 4413 struct ext4_super_block *es) 4414 { 4415 unsigned long def_mount_opts; 4416 4417 /* Set defaults before we parse the mount options */ 4418 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 4419 set_opt(sb, INIT_INODE_TABLE); 4420 if (def_mount_opts & EXT4_DEFM_DEBUG) 4421 set_opt(sb, DEBUG); 4422 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 4423 set_opt(sb, GRPID); 4424 if (def_mount_opts & EXT4_DEFM_UID16) 4425 set_opt(sb, NO_UID32); 4426 /* xattr user namespace & acls are now defaulted on */ 4427 set_opt(sb, XATTR_USER); 4428 #ifdef CONFIG_EXT4_FS_POSIX_ACL 4429 set_opt(sb, POSIX_ACL); 4430 #endif 4431 if (ext4_has_feature_fast_commit(sb)) 4432 set_opt2(sb, JOURNAL_FAST_COMMIT); 4433 /* don't forget to enable journal_csum when metadata_csum is enabled. */ 4434 if (ext4_has_feature_metadata_csum(sb)) 4435 set_opt(sb, JOURNAL_CHECKSUM); 4436 4437 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 4438 set_opt(sb, JOURNAL_DATA); 4439 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 4440 set_opt(sb, ORDERED_DATA); 4441 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 4442 set_opt(sb, WRITEBACK_DATA); 4443 4444 if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC) 4445 set_opt(sb, ERRORS_PANIC); 4446 else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE) 4447 set_opt(sb, ERRORS_CONT); 4448 else 4449 set_opt(sb, ERRORS_RO); 4450 /* block_validity enabled by default; disable with noblock_validity */ 4451 set_opt(sb, BLOCK_VALIDITY); 4452 if (def_mount_opts & EXT4_DEFM_DISCARD) 4453 set_opt(sb, DISCARD); 4454 4455 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 4456 set_opt(sb, BARRIER); 4457 4458 /* 4459 * enable delayed allocation by default 4460 * Use -o nodelalloc to turn it off 4461 */ 4462 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && 4463 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 4464 set_opt(sb, DELALLOC); 4465 4466 set_opt(sb, DIOREAD_NOLOCK); 4467 } 4468 4469 static int ext4_handle_clustersize(struct super_block *sb) 4470 { 4471 struct ext4_sb_info *sbi = EXT4_SB(sb); 4472 struct ext4_super_block *es = sbi->s_es; 4473 int clustersize; 4474 4475 /* Handle clustersize */ 4476 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 4477 if (ext4_has_feature_bigalloc(sb)) { 4478 if (clustersize < sb->s_blocksize) { 4479 ext4_msg(sb, KERN_ERR, 4480 "cluster size (%d) smaller than " 4481 "block size (%lu)", clustersize, sb->s_blocksize); 4482 return -EINVAL; 4483 } 4484 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 4485 le32_to_cpu(es->s_log_block_size); 4486 } else { 4487 if (clustersize != sb->s_blocksize) { 4488 ext4_msg(sb, KERN_ERR, 4489 "fragment/cluster size (%d) != " 4490 "block size (%lu)", clustersize, sb->s_blocksize); 4491 return -EINVAL; 4492 } 4493 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 4494 ext4_msg(sb, KERN_ERR, 4495 "#blocks per group too big: %lu", 4496 sbi->s_blocks_per_group); 4497 return -EINVAL; 4498 } 4499 sbi->s_cluster_bits = 0; 4500 } 4501 sbi->s_clusters_per_group = le32_to_cpu(es->s_clusters_per_group); 4502 if (sbi->s_clusters_per_group > sb->s_blocksize * 8 || 4503 sbi->s_clusters_per_group & 7) { 4504 ext4_msg(sb, KERN_ERR, "invalid #clusters per group: %lu", 4505 sbi->s_clusters_per_group); 4506 return -EINVAL; 4507 } 4508 if (sbi->s_blocks_per_group != 4509 (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) { 4510 ext4_msg(sb, KERN_ERR, 4511 "blocks per group (%lu) and clusters per group (%lu) inconsistent", 4512 sbi->s_blocks_per_group, sbi->s_clusters_per_group); 4513 return -EINVAL; 4514 } 4515 sbi->s_cluster_ratio = clustersize / sb->s_blocksize; 4516 4517 /* Do we have standard group size of clustersize * 8 blocks ? */ 4518 if (sbi->s_blocks_per_group == clustersize << 3) 4519 set_opt2(sb, STD_GROUP_SIZE); 4520 4521 return 0; 4522 } 4523 4524 /* 4525 * ext4_atomic_write_init: Initializes filesystem min & max atomic write units. 4526 * With non-bigalloc filesystem awu will be based upon filesystem blocksize 4527 * & bdev awu units. 4528 * With bigalloc it will be based upon bigalloc cluster size & bdev awu units. 4529 * @sb: super block 4530 */ 4531 static void ext4_atomic_write_init(struct super_block *sb) 4532 { 4533 struct ext4_sb_info *sbi = EXT4_SB(sb); 4534 struct block_device *bdev = sb->s_bdev; 4535 unsigned int clustersize = EXT4_CLUSTER_SIZE(sb); 4536 4537 if (!bdev_can_atomic_write(bdev)) 4538 return; 4539 4540 if (!ext4_has_feature_extents(sb)) 4541 return; 4542 4543 sbi->s_awu_min = max(sb->s_blocksize, 4544 bdev_atomic_write_unit_min_bytes(bdev)); 4545 sbi->s_awu_max = min(clustersize, 4546 bdev_atomic_write_unit_max_bytes(bdev)); 4547 if (sbi->s_awu_min && sbi->s_awu_max && 4548 sbi->s_awu_min <= sbi->s_awu_max) { 4549 ext4_msg(sb, KERN_NOTICE, "Supports (experimental) DIO atomic writes awu_min: %u, awu_max: %u", 4550 sbi->s_awu_min, sbi->s_awu_max); 4551 } else { 4552 sbi->s_awu_min = 0; 4553 sbi->s_awu_max = 0; 4554 } 4555 } 4556 4557 static void ext4_fast_commit_init(struct super_block *sb) 4558 { 4559 struct ext4_sb_info *sbi = EXT4_SB(sb); 4560 4561 /* Initialize fast commit stuff */ 4562 atomic_set(&sbi->s_fc_subtid, 0); 4563 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]); 4564 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]); 4565 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]); 4566 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]); 4567 sbi->s_fc_bytes = 0; 4568 ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE); 4569 sbi->s_fc_ineligible_tid = 0; 4570 mutex_init(&sbi->s_fc_lock); 4571 memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats)); 4572 memset(&sbi->s_fc_snap_stats, 0, sizeof(sbi->s_fc_snap_stats)); 4573 sbi->s_fc_replay_state.fc_regions = NULL; 4574 sbi->s_fc_replay_state.fc_regions_size = 0; 4575 sbi->s_fc_replay_state.fc_regions_used = 0; 4576 sbi->s_fc_replay_state.fc_regions_valid = 0; 4577 sbi->s_fc_replay_state.fc_modified_inodes = NULL; 4578 sbi->s_fc_replay_state.fc_modified_inodes_size = 0; 4579 sbi->s_fc_replay_state.fc_modified_inodes_used = 0; 4580 } 4581 4582 static int ext4_inode_info_init(struct super_block *sb, 4583 struct ext4_super_block *es) 4584 { 4585 struct ext4_sb_info *sbi = EXT4_SB(sb); 4586 4587 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 4588 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 4589 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 4590 } else { 4591 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 4592 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 4593 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) { 4594 ext4_msg(sb, KERN_ERR, "invalid first ino: %u", 4595 sbi->s_first_ino); 4596 return -EINVAL; 4597 } 4598 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 4599 (!is_power_of_2(sbi->s_inode_size)) || 4600 (sbi->s_inode_size > sb->s_blocksize)) { 4601 ext4_msg(sb, KERN_ERR, 4602 "unsupported inode size: %d", 4603 sbi->s_inode_size); 4604 ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize); 4605 return -EINVAL; 4606 } 4607 /* 4608 * i_atime_extra is the last extra field available for 4609 * [acm]times in struct ext4_inode. Checking for that 4610 * field should suffice to ensure we have extra space 4611 * for all three. 4612 */ 4613 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) + 4614 sizeof(((struct ext4_inode *)0)->i_atime_extra)) { 4615 sb->s_time_gran = 1; 4616 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX; 4617 } else { 4618 sb->s_time_gran = NSEC_PER_SEC; 4619 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX; 4620 } 4621 sb->s_time_min = EXT4_TIMESTAMP_MIN; 4622 } 4623 4624 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 4625 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 4626 EXT4_GOOD_OLD_INODE_SIZE; 4627 if (ext4_has_feature_extra_isize(sb)) { 4628 unsigned v, max = (sbi->s_inode_size - 4629 EXT4_GOOD_OLD_INODE_SIZE); 4630 4631 v = le16_to_cpu(es->s_want_extra_isize); 4632 if (v > max) { 4633 ext4_msg(sb, KERN_ERR, 4634 "bad s_want_extra_isize: %d", v); 4635 return -EINVAL; 4636 } 4637 if (sbi->s_want_extra_isize < v) 4638 sbi->s_want_extra_isize = v; 4639 4640 v = le16_to_cpu(es->s_min_extra_isize); 4641 if (v > max) { 4642 ext4_msg(sb, KERN_ERR, 4643 "bad s_min_extra_isize: %d", v); 4644 return -EINVAL; 4645 } 4646 if (sbi->s_want_extra_isize < v) 4647 sbi->s_want_extra_isize = v; 4648 } 4649 } 4650 4651 return 0; 4652 } 4653 4654 #if IS_ENABLED(CONFIG_UNICODE) 4655 static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es) 4656 { 4657 const struct ext4_sb_encodings *encoding_info; 4658 struct unicode_map *encoding; 4659 __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags); 4660 4661 if (!ext4_has_feature_casefold(sb) || sb->s_encoding) 4662 return 0; 4663 4664 encoding_info = ext4_sb_read_encoding(es); 4665 if (!encoding_info) { 4666 ext4_msg(sb, KERN_ERR, 4667 "Encoding requested by superblock is unknown"); 4668 return -EINVAL; 4669 } 4670 4671 encoding = utf8_load(encoding_info->version); 4672 if (IS_ERR(encoding)) { 4673 ext4_msg(sb, KERN_ERR, 4674 "can't mount with superblock charset: %s-%u.%u.%u " 4675 "not supported by the kernel. flags: 0x%x.", 4676 encoding_info->name, 4677 unicode_major(encoding_info->version), 4678 unicode_minor(encoding_info->version), 4679 unicode_rev(encoding_info->version), 4680 encoding_flags); 4681 return -EINVAL; 4682 } 4683 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: " 4684 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name, 4685 unicode_major(encoding_info->version), 4686 unicode_minor(encoding_info->version), 4687 unicode_rev(encoding_info->version), 4688 encoding_flags); 4689 4690 sb->s_encoding = encoding; 4691 sb->s_encoding_flags = encoding_flags; 4692 4693 return 0; 4694 } 4695 #else 4696 static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es) 4697 { 4698 return 0; 4699 } 4700 #endif 4701 4702 static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es) 4703 { 4704 struct ext4_sb_info *sbi = EXT4_SB(sb); 4705 4706 /* Warn if metadata_csum and gdt_csum are both set. */ 4707 if (ext4_has_feature_metadata_csum(sb) && 4708 ext4_has_feature_gdt_csum(sb)) 4709 ext4_warning(sb, "metadata_csum and uninit_bg are " 4710 "redundant flags; please run fsck."); 4711 4712 /* Check for a known checksum algorithm */ 4713 if (!ext4_verify_csum_type(sb, es)) { 4714 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 4715 "unknown checksum algorithm."); 4716 return -EINVAL; 4717 } 4718 ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE, 4719 ext4_orphan_file_block_trigger); 4720 4721 /* Check superblock checksum */ 4722 if (!ext4_superblock_csum_verify(sb, es)) { 4723 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 4724 "invalid superblock checksum. Run e2fsck?"); 4725 return -EFSBADCRC; 4726 } 4727 4728 /* Precompute checksum seed for all metadata */ 4729 if (ext4_has_feature_csum_seed(sb)) 4730 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed); 4731 else if (ext4_has_feature_metadata_csum(sb) || 4732 ext4_has_feature_ea_inode(sb)) 4733 sbi->s_csum_seed = ext4_chksum(~0, es->s_uuid, 4734 sizeof(es->s_uuid)); 4735 return 0; 4736 } 4737 4738 static int ext4_check_feature_compatibility(struct super_block *sb, 4739 struct ext4_super_block *es, 4740 int silent) 4741 { 4742 struct ext4_sb_info *sbi = EXT4_SB(sb); 4743 4744 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 4745 (ext4_has_compat_features(sb) || 4746 ext4_has_ro_compat_features(sb) || 4747 ext4_has_incompat_features(sb))) 4748 ext4_msg(sb, KERN_WARNING, 4749 "feature flags set on rev 0 fs, " 4750 "running e2fsck is recommended"); 4751 4752 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { 4753 set_opt2(sb, HURD_COMPAT); 4754 if (ext4_has_feature_64bit(sb)) { 4755 ext4_msg(sb, KERN_ERR, 4756 "The Hurd can't support 64-bit file systems"); 4757 return -EINVAL; 4758 } 4759 4760 /* 4761 * ea_inode feature uses l_i_version field which is not 4762 * available in HURD_COMPAT mode. 4763 */ 4764 if (ext4_has_feature_ea_inode(sb)) { 4765 ext4_msg(sb, KERN_ERR, 4766 "ea_inode feature is not supported for Hurd"); 4767 return -EINVAL; 4768 } 4769 } 4770 4771 if (IS_EXT2_SB(sb)) { 4772 if (ext2_feature_set_ok(sb)) 4773 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 4774 "using the ext4 subsystem"); 4775 else { 4776 /* 4777 * If we're probing be silent, if this looks like 4778 * it's actually an ext[34] filesystem. 4779 */ 4780 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb))) 4781 return -EINVAL; 4782 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 4783 "to feature incompatibilities"); 4784 return -EINVAL; 4785 } 4786 } 4787 4788 if (IS_EXT3_SB(sb)) { 4789 if (ext3_feature_set_ok(sb)) 4790 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 4791 "using the ext4 subsystem"); 4792 else { 4793 /* 4794 * If we're probing be silent, if this looks like 4795 * it's actually an ext4 filesystem. 4796 */ 4797 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb))) 4798 return -EINVAL; 4799 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 4800 "to feature incompatibilities"); 4801 return -EINVAL; 4802 } 4803 } 4804 4805 /* 4806 * Check feature flags regardless of the revision level, since we 4807 * previously didn't change the revision level when setting the flags, 4808 * so there is a chance incompat flags are set on a rev 0 filesystem. 4809 */ 4810 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb)))) 4811 return -EINVAL; 4812 4813 if (sbi->s_daxdev) { 4814 if (sb->s_blocksize == PAGE_SIZE) 4815 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags); 4816 else 4817 ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n"); 4818 } 4819 4820 if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) { 4821 if (ext4_has_feature_inline_data(sb)) { 4822 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem" 4823 " that may contain inline data"); 4824 return -EINVAL; 4825 } 4826 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) { 4827 ext4_msg(sb, KERN_ERR, 4828 "DAX unsupported by block device."); 4829 return -EINVAL; 4830 } 4831 } 4832 4833 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { 4834 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", 4835 es->s_encryption_level); 4836 return -EINVAL; 4837 } 4838 4839 return 0; 4840 } 4841 4842 static int ext4_check_geometry(struct super_block *sb, 4843 struct ext4_super_block *es) 4844 { 4845 struct ext4_sb_info *sbi = EXT4_SB(sb); 4846 __u64 blocks_count; 4847 int err; 4848 4849 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) { 4850 ext4_msg(sb, KERN_ERR, 4851 "Number of reserved GDT blocks insanely large: %d", 4852 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks)); 4853 return -EINVAL; 4854 } 4855 /* 4856 * Test whether we have more sectors than will fit in sector_t, 4857 * and whether the max offset is addressable by the page cache. 4858 */ 4859 err = generic_check_addressable(sb->s_blocksize_bits, 4860 ext4_blocks_count(es)); 4861 if (err) { 4862 ext4_msg(sb, KERN_ERR, "filesystem" 4863 " too large to mount safely on this system"); 4864 return err; 4865 } 4866 4867 /* check blocks count against device size */ 4868 blocks_count = sb_bdev_nr_blocks(sb); 4869 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 4870 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 4871 "exceeds size of device (%llu blocks)", 4872 ext4_blocks_count(es), blocks_count); 4873 return -EINVAL; 4874 } 4875 4876 /* 4877 * It makes no sense for the first data block to be beyond the end 4878 * of the filesystem. 4879 */ 4880 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 4881 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 4882 "block %u is beyond end of filesystem (%llu)", 4883 le32_to_cpu(es->s_first_data_block), 4884 ext4_blocks_count(es)); 4885 return -EINVAL; 4886 } 4887 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) && 4888 (sbi->s_cluster_ratio == 1)) { 4889 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 4890 "block is 0 with a 1k block and cluster size"); 4891 return -EINVAL; 4892 } 4893 4894 blocks_count = (ext4_blocks_count(es) - 4895 le32_to_cpu(es->s_first_data_block) + 4896 EXT4_BLOCKS_PER_GROUP(sb) - 1); 4897 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 4898 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 4899 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu " 4900 "(block count %llu, first data block %u, " 4901 "blocks per group %lu)", blocks_count, 4902 ext4_blocks_count(es), 4903 le32_to_cpu(es->s_first_data_block), 4904 EXT4_BLOCKS_PER_GROUP(sb)); 4905 return -EINVAL; 4906 } 4907 sbi->s_groups_count = blocks_count; 4908 sbi->s_blockfile_groups = min(sbi->s_groups_count, 4909 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 4910 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) != 4911 le32_to_cpu(es->s_inodes_count)) { 4912 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu", 4913 le32_to_cpu(es->s_inodes_count), 4914 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group)); 4915 return -EINVAL; 4916 } 4917 4918 return 0; 4919 } 4920 4921 static int ext4_group_desc_init(struct super_block *sb, 4922 struct ext4_super_block *es, 4923 ext4_fsblk_t logical_sb_block, 4924 ext4_group_t *first_not_zeroed) 4925 { 4926 struct ext4_sb_info *sbi = EXT4_SB(sb); 4927 unsigned int db_count; 4928 ext4_fsblk_t block; 4929 int i; 4930 4931 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 4932 EXT4_DESC_PER_BLOCK(sb); 4933 if (ext4_has_feature_meta_bg(sb)) { 4934 if (le32_to_cpu(es->s_first_meta_bg) > db_count) { 4935 ext4_msg(sb, KERN_WARNING, 4936 "first meta block group too large: %u " 4937 "(group descriptor block count %u)", 4938 le32_to_cpu(es->s_first_meta_bg), db_count); 4939 return -EINVAL; 4940 } 4941 } 4942 rcu_assign_pointer(sbi->s_group_desc, 4943 kvmalloc_objs(struct buffer_head *, db_count)); 4944 if (sbi->s_group_desc == NULL) { 4945 ext4_msg(sb, KERN_ERR, "not enough memory"); 4946 return -ENOMEM; 4947 } 4948 4949 bgl_lock_init(sbi->s_blockgroup_lock); 4950 4951 /* Pre-read the descriptors into the buffer cache */ 4952 for (i = 0; i < db_count; i++) { 4953 block = descriptor_loc(sb, logical_sb_block, i); 4954 ext4_sb_breadahead_unmovable(sb, block); 4955 } 4956 4957 for (i = 0; i < db_count; i++) { 4958 struct buffer_head *bh; 4959 4960 block = descriptor_loc(sb, logical_sb_block, i); 4961 bh = ext4_sb_bread_unmovable(sb, block); 4962 if (IS_ERR(bh)) { 4963 ext4_msg(sb, KERN_ERR, 4964 "can't read group descriptor %d", i); 4965 sbi->s_gdb_count = i; 4966 return PTR_ERR(bh); 4967 } 4968 rcu_read_lock(); 4969 rcu_dereference(sbi->s_group_desc)[i] = bh; 4970 rcu_read_unlock(); 4971 } 4972 sbi->s_gdb_count = db_count; 4973 if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) { 4974 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 4975 return -EFSCORRUPTED; 4976 } 4977 4978 return 0; 4979 } 4980 4981 static int ext4_load_and_init_journal(struct super_block *sb, 4982 struct ext4_super_block *es, 4983 struct ext4_fs_context *ctx) 4984 { 4985 struct ext4_sb_info *sbi = EXT4_SB(sb); 4986 int err; 4987 4988 err = ext4_load_journal(sb, es, ctx->journal_devnum); 4989 if (err) 4990 return err; 4991 4992 if (ext4_has_feature_64bit(sb) && 4993 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 4994 JBD2_FEATURE_INCOMPAT_64BIT)) { 4995 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 4996 goto out; 4997 } 4998 4999 if (!set_journal_csum_feature_set(sb)) { 5000 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " 5001 "feature set"); 5002 goto out; 5003 } 5004 5005 if (test_opt2(sb, JOURNAL_FAST_COMMIT) && 5006 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 5007 JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) { 5008 ext4_msg(sb, KERN_ERR, 5009 "Failed to set fast commit journal feature"); 5010 goto out; 5011 } 5012 5013 /* We have now updated the journal if required, so we can 5014 * validate the data journaling mode. */ 5015 switch (test_opt(sb, DATA_FLAGS)) { 5016 case 0: 5017 /* No mode set, assume a default based on the journal 5018 * capabilities: ORDERED_DATA if the journal can 5019 * cope, else JOURNAL_DATA 5020 */ 5021 if (jbd2_journal_check_available_features 5022 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 5023 set_opt(sb, ORDERED_DATA); 5024 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 5025 } else { 5026 set_opt(sb, JOURNAL_DATA); 5027 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 5028 } 5029 break; 5030 5031 case EXT4_MOUNT_ORDERED_DATA: 5032 case EXT4_MOUNT_WRITEBACK_DATA: 5033 if (!jbd2_journal_check_available_features 5034 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 5035 ext4_msg(sb, KERN_ERR, "Journal does not support " 5036 "requested data journaling mode"); 5037 goto out; 5038 } 5039 break; 5040 default: 5041 break; 5042 } 5043 5044 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && 5045 test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 5046 ext4_msg(sb, KERN_ERR, "can't mount with " 5047 "journal_async_commit in data=ordered mode"); 5048 goto out; 5049 } 5050 5051 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio); 5052 5053 sbi->s_journal->j_submit_inode_data_buffers = 5054 ext4_journal_submit_inode_data_buffers; 5055 sbi->s_journal->j_finish_inode_data_buffers = 5056 ext4_journal_finish_inode_data_buffers; 5057 5058 return 0; 5059 5060 out: 5061 ext4_journal_destroy(sbi, sbi->s_journal); 5062 return -EINVAL; 5063 } 5064 5065 static int ext4_check_journal_data_mode(struct super_block *sb) 5066 { 5067 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 5068 printk(KERN_WARNING "EXT4-fs: The data=journal mount option is deprecated and support will be removed in January 2028\n"); 5069 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with " 5070 "data=journal disables delayed allocation, " 5071 "dioread_nolock, O_DIRECT and fast_commit support!\n"); 5072 /* can't mount with both data=journal and dioread_nolock. */ 5073 clear_opt(sb, DIOREAD_NOLOCK); 5074 clear_opt2(sb, JOURNAL_FAST_COMMIT); 5075 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 5076 ext4_msg(sb, KERN_ERR, "can't mount with " 5077 "both data=journal and delalloc"); 5078 return -EINVAL; 5079 } 5080 if (test_opt(sb, DAX_ALWAYS)) { 5081 ext4_msg(sb, KERN_ERR, "can't mount with " 5082 "both data=journal and dax"); 5083 return -EINVAL; 5084 } 5085 if (ext4_has_feature_encrypt(sb)) { 5086 ext4_msg(sb, KERN_WARNING, 5087 "encrypted files will use data=ordered " 5088 "instead of data journaling mode"); 5089 } 5090 if (test_opt(sb, DELALLOC)) 5091 clear_opt(sb, DELALLOC); 5092 } else { 5093 sb->s_iflags |= SB_I_CGROUPWB; 5094 } 5095 5096 return 0; 5097 } 5098 5099 static const char *ext4_has_journal_option(struct super_block *sb) 5100 { 5101 struct ext4_sb_info *sbi = EXT4_SB(sb); 5102 5103 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 5104 return "journal_async_commit"; 5105 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) 5106 return "journal_checksum"; 5107 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 5108 return "commit="; 5109 if (EXT4_MOUNT_DATA_FLAGS & 5110 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) 5111 return "data="; 5112 if (test_opt(sb, DATA_ERR_ABORT)) 5113 return "data_err=abort"; 5114 return NULL; 5115 } 5116 5117 /* 5118 * Limit the maximum folio order to 2048 blocks to prevent overestimation 5119 * of reserve handle credits during the folio writeback in environments 5120 * where the PAGE_SIZE exceeds 4KB. 5121 */ 5122 #define EXT4_MAX_PAGECACHE_ORDER(sb) \ 5123 umin(MAX_PAGECACHE_ORDER, (11 + (sb)->s_blocksize_bits - PAGE_SHIFT)) 5124 static void ext4_set_max_mapping_order(struct super_block *sb) 5125 { 5126 struct ext4_sb_info *sbi = EXT4_SB(sb); 5127 5128 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 5129 sbi->s_max_folio_order = sbi->s_min_folio_order; 5130 else 5131 sbi->s_max_folio_order = EXT4_MAX_PAGECACHE_ORDER(sb); 5132 } 5133 5134 static int ext4_check_large_folio(struct super_block *sb) 5135 { 5136 const char *err_str = NULL; 5137 5138 if (ext4_has_feature_encrypt(sb)) 5139 err_str = "encrypt"; 5140 5141 if (!err_str) { 5142 ext4_set_max_mapping_order(sb); 5143 } else if (sb->s_blocksize > PAGE_SIZE) { 5144 ext4_msg(sb, KERN_ERR, "bs(%lu) > ps(%lu) unsupported for %s", 5145 sb->s_blocksize, PAGE_SIZE, err_str); 5146 return -EINVAL; 5147 } 5148 5149 return 0; 5150 } 5151 5152 static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb, 5153 int silent) 5154 { 5155 struct ext4_sb_info *sbi = EXT4_SB(sb); 5156 struct ext4_super_block *es; 5157 ext4_fsblk_t logical_sb_block; 5158 unsigned long offset = 0; 5159 struct buffer_head *bh; 5160 int ret = -EINVAL; 5161 int blocksize; 5162 5163 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 5164 if (!blocksize) { 5165 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 5166 return -EINVAL; 5167 } 5168 5169 /* 5170 * The ext4 superblock will not be buffer aligned for other than 1kB 5171 * block sizes. We need to calculate the offset from buffer start. 5172 */ 5173 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 5174 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE; 5175 offset = do_div(logical_sb_block, blocksize); 5176 } else { 5177 logical_sb_block = sbi->s_sb_block; 5178 } 5179 5180 bh = ext4_sb_bread_unmovable(sb, logical_sb_block); 5181 if (IS_ERR(bh)) { 5182 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 5183 return PTR_ERR(bh); 5184 } 5185 /* 5186 * Note: s_es must be initialized as soon as possible because 5187 * some ext4 macro-instructions depend on its value 5188 */ 5189 es = (struct ext4_super_block *) (bh->b_data + offset); 5190 sbi->s_es = es; 5191 sb->s_magic = le16_to_cpu(es->s_magic); 5192 if (sb->s_magic != EXT4_SUPER_MAGIC) { 5193 if (!silent) 5194 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 5195 goto out; 5196 } 5197 5198 if (le32_to_cpu(es->s_log_block_size) > 5199 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { 5200 ext4_msg(sb, KERN_ERR, 5201 "Invalid log block size: %u", 5202 le32_to_cpu(es->s_log_block_size)); 5203 goto out; 5204 } 5205 if (le32_to_cpu(es->s_log_cluster_size) > 5206 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { 5207 ext4_msg(sb, KERN_ERR, 5208 "Invalid log cluster size: %u", 5209 le32_to_cpu(es->s_log_cluster_size)); 5210 goto out; 5211 } 5212 5213 blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 5214 5215 /* 5216 * If the default block size is not the same as the real block size, 5217 * we need to reload it. 5218 */ 5219 if (sb->s_blocksize == blocksize) 5220 goto success; 5221 5222 /* 5223 * bh must be released before kill_bdev(), otherwise 5224 * it won't be freed and its page also. kill_bdev() 5225 * is called by sb_set_blocksize(). 5226 */ 5227 brelse(bh); 5228 /* Validate the filesystem blocksize */ 5229 if (!sb_set_blocksize(sb, blocksize)) { 5230 ext4_msg(sb, KERN_ERR, "bad block size %d", 5231 blocksize); 5232 bh = NULL; 5233 goto out; 5234 } 5235 5236 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE; 5237 offset = do_div(logical_sb_block, blocksize); 5238 bh = ext4_sb_bread_unmovable(sb, logical_sb_block); 5239 if (IS_ERR(bh)) { 5240 ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try"); 5241 ret = PTR_ERR(bh); 5242 bh = NULL; 5243 goto out; 5244 } 5245 es = (struct ext4_super_block *)(bh->b_data + offset); 5246 sbi->s_es = es; 5247 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 5248 ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!"); 5249 goto out; 5250 } 5251 5252 success: 5253 sbi->s_min_folio_order = get_order(blocksize); 5254 *lsb = logical_sb_block; 5255 sbi->s_sbh = bh; 5256 return 0; 5257 out: 5258 brelse(bh); 5259 return ret; 5260 } 5261 5262 static int ext4_hash_info_init(struct super_block *sb) 5263 { 5264 struct ext4_sb_info *sbi = EXT4_SB(sb); 5265 struct ext4_super_block *es = sbi->s_es; 5266 unsigned int i; 5267 5268 sbi->s_def_hash_version = es->s_def_hash_version; 5269 5270 if (sbi->s_def_hash_version > DX_HASH_LAST) { 5271 ext4_msg(sb, KERN_ERR, 5272 "Invalid default hash set in the superblock"); 5273 return -EINVAL; 5274 } else if (sbi->s_def_hash_version == DX_HASH_SIPHASH) { 5275 ext4_msg(sb, KERN_ERR, 5276 "SIPHASH is not a valid default hash value"); 5277 return -EINVAL; 5278 } 5279 5280 for (i = 0; i < 4; i++) 5281 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 5282 5283 if (ext4_has_feature_dir_index(sb)) { 5284 i = le32_to_cpu(es->s_flags); 5285 if (i & EXT2_FLAGS_UNSIGNED_HASH) 5286 sbi->s_hash_unsigned = 3; 5287 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 5288 #ifdef __CHAR_UNSIGNED__ 5289 if (!sb_rdonly(sb)) 5290 es->s_flags |= 5291 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 5292 sbi->s_hash_unsigned = 3; 5293 #else 5294 if (!sb_rdonly(sb)) 5295 es->s_flags |= 5296 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 5297 #endif 5298 } 5299 } 5300 return 0; 5301 } 5302 5303 static int ext4_block_group_meta_init(struct super_block *sb, int silent) 5304 { 5305 struct ext4_sb_info *sbi = EXT4_SB(sb); 5306 struct ext4_super_block *es = sbi->s_es; 5307 int has_huge_files; 5308 5309 has_huge_files = ext4_has_feature_huge_file(sb); 5310 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 5311 has_huge_files); 5312 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 5313 5314 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 5315 if (ext4_has_feature_64bit(sb)) { 5316 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 5317 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 5318 !is_power_of_2(sbi->s_desc_size)) { 5319 ext4_msg(sb, KERN_ERR, 5320 "unsupported descriptor size %lu", 5321 sbi->s_desc_size); 5322 return -EINVAL; 5323 } 5324 } else 5325 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 5326 5327 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 5328 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 5329 5330 sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb); 5331 if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) { 5332 if (!silent) 5333 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 5334 return -EINVAL; 5335 } 5336 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || 5337 sbi->s_inodes_per_group > sb->s_blocksize * 8 || 5338 sbi->s_inodes_per_group & 7 || 5339 sbi->s_inodes_per_group % sbi->s_inodes_per_block) { 5340 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu", 5341 sbi->s_inodes_per_group); 5342 return -EINVAL; 5343 } 5344 sbi->s_itb_per_group = sbi->s_inodes_per_group / 5345 sbi->s_inodes_per_block; 5346 sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb); 5347 sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY; 5348 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 5349 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 5350 5351 return 0; 5352 } 5353 5354 /* 5355 * It's hard to get stripe aligned blocks if stripe is not aligned with 5356 * cluster, just disable stripe and alert user to simplify code and avoid 5357 * stripe aligned allocation which will rarely succeed. 5358 */ 5359 static bool ext4_is_stripe_incompatible(struct super_block *sb, unsigned long stripe) 5360 { 5361 struct ext4_sb_info *sbi = EXT4_SB(sb); 5362 return (stripe > 0 && sbi->s_cluster_ratio > 1 && 5363 stripe % sbi->s_cluster_ratio != 0); 5364 } 5365 5366 static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb) 5367 { 5368 struct ext4_super_block *es = NULL; 5369 struct ext4_sb_info *sbi = EXT4_SB(sb); 5370 ext4_fsblk_t logical_sb_block; 5371 struct inode *root; 5372 int needs_recovery; 5373 int err; 5374 ext4_group_t first_not_zeroed; 5375 struct ext4_fs_context *ctx = fc->fs_private; 5376 int silent = fc->sb_flags & SB_SILENT; 5377 5378 /* Set defaults for the variables that will be set during parsing */ 5379 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) 5380 ctx->journal_ioprio = EXT4_DEF_JOURNAL_IOPRIO; 5381 5382 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 5383 sbi->s_sectors_written_start = 5384 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]); 5385 5386 err = ext4_load_super(sb, &logical_sb_block, silent); 5387 if (err) 5388 goto out_fail; 5389 5390 es = sbi->s_es; 5391 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 5392 5393 err = ext4_init_metadata_csum(sb, es); 5394 if (err) 5395 goto failed_mount; 5396 5397 ext4_set_def_opts(sb, es); 5398 5399 sbi->s_resuid = make_kuid(&init_user_ns, ext4_get_resuid(es)); 5400 sbi->s_resgid = make_kgid(&init_user_ns, ext4_get_resgid(es)); 5401 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 5402 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 5403 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 5404 sbi->s_sb_update_kb = EXT4_DEF_SB_UPDATE_INTERVAL_KB; 5405 sbi->s_sb_update_sec = EXT4_DEF_SB_UPDATE_INTERVAL_SEC; 5406 5407 /* 5408 * set default s_li_wait_mult for lazyinit, for the case there is 5409 * no mount option specified. 5410 */ 5411 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 5412 5413 err = ext4_inode_info_init(sb, es); 5414 if (err) 5415 goto failed_mount; 5416 5417 err = parse_apply_sb_mount_options(sb, ctx); 5418 if (err < 0) 5419 goto failed_mount; 5420 5421 sbi->s_def_mount_opt = sbi->s_mount_opt; 5422 sbi->s_def_mount_opt2 = sbi->s_mount_opt2; 5423 5424 err = ext4_check_opt_consistency(fc, sb); 5425 if (err < 0) 5426 goto failed_mount; 5427 5428 ext4_apply_options(fc, sb); 5429 5430 err = ext4_check_large_folio(sb); 5431 if (err < 0) 5432 goto failed_mount; 5433 5434 err = ext4_encoding_init(sb, es); 5435 if (err) 5436 goto failed_mount; 5437 5438 err = ext4_check_journal_data_mode(sb); 5439 if (err) 5440 goto failed_mount; 5441 5442 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 5443 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 5444 5445 /* HSM events are allowed by default. */ 5446 sb->s_iflags |= SB_I_ALLOW_HSM; 5447 5448 err = ext4_check_feature_compatibility(sb, es, silent); 5449 if (err) 5450 goto failed_mount; 5451 5452 err = ext4_block_group_meta_init(sb, silent); 5453 if (err) 5454 goto failed_mount; 5455 5456 err = ext4_hash_info_init(sb); 5457 if (err) 5458 goto failed_mount; 5459 5460 err = ext4_handle_clustersize(sb); 5461 if (err) 5462 goto failed_mount; 5463 5464 err = ext4_check_geometry(sb, es); 5465 if (err) 5466 goto failed_mount; 5467 5468 timer_setup(&sbi->s_err_report, print_daily_error_info, 0); 5469 spin_lock_init(&sbi->s_error_lock); 5470 mutex_init(&sbi->s_error_notify_mutex); 5471 INIT_WORK(&sbi->s_sb_upd_work, update_super_work); 5472 5473 err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed); 5474 if (err) 5475 goto failed_mount3; 5476 5477 err = ext4_es_register_shrinker(sbi); 5478 if (err) 5479 goto failed_mount3; 5480 5481 sbi->s_stripe = ext4_get_stripe_size(sbi); 5482 if (ext4_is_stripe_incompatible(sb, sbi->s_stripe)) { 5483 ext4_msg(sb, KERN_WARNING, 5484 "stripe (%lu) is not aligned with cluster size (%u), " 5485 "stripe is disabled", 5486 sbi->s_stripe, sbi->s_cluster_ratio); 5487 sbi->s_stripe = 0; 5488 } 5489 sbi->s_extent_max_zeroout_kb = 32; 5490 5491 /* 5492 * set up enough so that it can read an inode 5493 */ 5494 sb->s_op = &ext4_sops; 5495 sb->s_export_op = &ext4_export_ops; 5496 sb->s_xattr = ext4_xattr_handlers; 5497 #ifdef CONFIG_FS_ENCRYPTION 5498 sb->s_cop = &ext4_cryptops; 5499 #endif 5500 #ifdef CONFIG_FS_VERITY 5501 sb->s_vop = &ext4_verityops; 5502 #endif 5503 #ifdef CONFIG_QUOTA 5504 sb->dq_op = &ext4_quota_operations; 5505 if (ext4_has_feature_quota(sb)) 5506 sb->s_qcop = &dquot_quotactl_sysfile_ops; 5507 else 5508 sb->s_qcop = &ext4_qctl_operations; 5509 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; 5510 #endif 5511 super_set_uuid(sb, es->s_uuid, sizeof(es->s_uuid)); 5512 super_set_sysfs_name_bdev(sb); 5513 5514 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 5515 mutex_init(&sbi->s_orphan_lock); 5516 5517 spin_lock_init(&sbi->s_bdev_wb_lock); 5518 5519 ext4_atomic_write_init(sb); 5520 ext4_fast_commit_init(sb); 5521 5522 sb->s_root = NULL; 5523 5524 needs_recovery = (es->s_last_orphan != 0 || 5525 ext4_has_feature_orphan_present(sb) || 5526 ext4_has_feature_journal_needs_recovery(sb)); 5527 5528 ext4_init_ea_inode_work(sbi); 5529 5530 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) { 5531 err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)); 5532 if (err) 5533 goto failed_mount3a; 5534 } 5535 5536 err = -EINVAL; 5537 /* 5538 * The first inode we look at is the journal inode. Don't try 5539 * root first: it may be modified in the journal! 5540 */ 5541 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { 5542 err = ext4_load_and_init_journal(sb, es, ctx); 5543 if (err) 5544 goto failed_mount3a; 5545 if (bdev_read_only(sb->s_bdev)) 5546 needs_recovery = 0; 5547 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) && 5548 ext4_has_feature_journal_needs_recovery(sb)) { 5549 ext4_msg(sb, KERN_ERR, "required journal recovery " 5550 "suppressed and not mounted read-only"); 5551 goto failed_mount3a; 5552 } else { 5553 const char *journal_option; 5554 5555 /* Nojournal mode, all journal mount options are illegal */ 5556 journal_option = ext4_has_journal_option(sb); 5557 if (journal_option != NULL) { 5558 ext4_msg(sb, KERN_ERR, 5559 "can't mount with %s, fs mounted w/o journal", 5560 journal_option); 5561 goto failed_mount3a; 5562 } 5563 5564 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM; 5565 clear_opt(sb, JOURNAL_CHECKSUM); 5566 clear_opt(sb, DATA_FLAGS); 5567 clear_opt2(sb, JOURNAL_FAST_COMMIT); 5568 sbi->s_journal = NULL; 5569 needs_recovery = 0; 5570 } 5571 5572 if (!test_opt(sb, NO_MBCACHE)) { 5573 sbi->s_ea_block_cache = ext4_xattr_create_cache(); 5574 if (!sbi->s_ea_block_cache) { 5575 ext4_msg(sb, KERN_ERR, 5576 "Failed to create ea_block_cache"); 5577 err = -EINVAL; 5578 goto failed_mount_wq; 5579 } 5580 5581 if (ext4_has_feature_ea_inode(sb)) { 5582 sbi->s_ea_inode_cache = ext4_xattr_create_cache(); 5583 if (!sbi->s_ea_inode_cache) { 5584 ext4_msg(sb, KERN_ERR, 5585 "Failed to create ea_inode_cache"); 5586 err = -EINVAL; 5587 goto failed_mount_wq; 5588 } 5589 } 5590 } 5591 5592 /* 5593 * Get the # of file system overhead blocks from the 5594 * superblock if present. 5595 */ 5596 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); 5597 /* ignore the precalculated value if it is ridiculous */ 5598 if (sbi->s_overhead > ext4_blocks_count(es)) 5599 sbi->s_overhead = 0; 5600 /* 5601 * If the bigalloc feature is not enabled recalculating the 5602 * overhead doesn't take long, so we might as well just redo 5603 * it to make sure we are using the correct value. 5604 */ 5605 if (!ext4_has_feature_bigalloc(sb)) 5606 sbi->s_overhead = 0; 5607 if (sbi->s_overhead == 0) { 5608 err = ext4_calculate_overhead(sb); 5609 if (err) 5610 goto failed_mount_wq; 5611 } 5612 5613 /* 5614 * The maximum number of concurrent works can be high and 5615 * concurrency isn't really necessary. Limit it to 1. 5616 */ 5617 EXT4_SB(sb)->rsv_conversion_wq = 5618 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 5619 if (!EXT4_SB(sb)->rsv_conversion_wq) { 5620 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); 5621 err = -ENOMEM; 5622 goto failed_mount4; 5623 } 5624 5625 /* 5626 * The jbd2_journal_load will have done any necessary log recovery, 5627 * so we can safely mount the rest of the filesystem now. 5628 */ 5629 5630 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL); 5631 if (IS_ERR(root)) { 5632 ext4_msg(sb, KERN_ERR, "get root inode failed"); 5633 err = PTR_ERR(root); 5634 root = NULL; 5635 goto failed_mount4; 5636 } 5637 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 5638 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 5639 iput(root); 5640 err = -EFSCORRUPTED; 5641 goto failed_mount4; 5642 } 5643 5644 generic_set_sb_d_ops(sb); 5645 sb->s_root = d_make_root(root); 5646 if (!sb->s_root) { 5647 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 5648 err = -ENOMEM; 5649 goto failed_mount4; 5650 } 5651 5652 err = ext4_setup_super(sb, es, sb_rdonly(sb)); 5653 if (err == -EROFS) { 5654 sb->s_flags |= SB_RDONLY; 5655 } else if (err) 5656 goto failed_mount4a; 5657 5658 ext4_set_resv_clusters(sb); 5659 5660 if (test_opt(sb, BLOCK_VALIDITY)) { 5661 err = ext4_setup_system_zone(sb); 5662 if (err) { 5663 ext4_msg(sb, KERN_ERR, "failed to initialize system " 5664 "zone (%d)", err); 5665 goto failed_mount4a; 5666 } 5667 } 5668 ext4_fc_replay_cleanup(sb); 5669 5670 ext4_ext_init(sb); 5671 5672 /* 5673 * Enable optimize_scan if number of groups is > threshold. This can be 5674 * turned off by passing "mb_optimize_scan=0". This can also be 5675 * turned on forcefully by passing "mb_optimize_scan=1". 5676 */ 5677 if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) { 5678 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD) 5679 set_opt2(sb, MB_OPTIMIZE_SCAN); 5680 else 5681 clear_opt2(sb, MB_OPTIMIZE_SCAN); 5682 } 5683 5684 err = ext4_percpu_param_init(sbi); 5685 if (err) 5686 goto failed_mount5; 5687 5688 err = ext4_mb_init(sb); 5689 if (err) { 5690 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 5691 err); 5692 goto failed_mount5; 5693 } 5694 5695 /* 5696 * We can only set up the journal commit callback once 5697 * mballoc is initialized 5698 */ 5699 if (sbi->s_journal) 5700 sbi->s_journal->j_commit_callback = 5701 ext4_journal_commit_callback; 5702 5703 if (ext4_has_feature_flex_bg(sb)) 5704 if (!ext4_fill_flex_info(sb)) { 5705 ext4_msg(sb, KERN_ERR, 5706 "unable to initialize " 5707 "flex_bg meta info!"); 5708 err = -ENOMEM; 5709 goto failed_mount6; 5710 } 5711 5712 err = ext4_register_li_request(sb, first_not_zeroed); 5713 if (err) 5714 goto failed_mount6; 5715 5716 err = ext4_init_orphan_info(sb); 5717 if (err) 5718 goto failed_mount7; 5719 #ifdef CONFIG_QUOTA 5720 /* Enable quota usage during mount. */ 5721 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) { 5722 err = ext4_enable_quotas(sb); 5723 if (err) 5724 goto failed_mount8; 5725 } 5726 #endif /* CONFIG_QUOTA */ 5727 5728 /* 5729 * Save the original bdev mapping's wb_err value which could be 5730 * used to detect the metadata async write error. 5731 */ 5732 errseq_check_and_advance(&sb->s_bdev->bd_mapping->wb_err, 5733 &sbi->s_bdev_wb_err); 5734 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 5735 ext4_orphan_cleanup(sb, es); 5736 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 5737 /* 5738 * Update the checksum after updating free space/inode counters and 5739 * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect 5740 * checksum in the buffer cache until it is written out and 5741 * e2fsprogs programs trying to open a file system immediately 5742 * after it is mounted can fail. 5743 */ 5744 ext4_superblock_csum_set(sb); 5745 if (needs_recovery) { 5746 ext4_msg(sb, KERN_INFO, "recovery complete"); 5747 err = ext4_mark_recovery_complete(sb, es); 5748 if (err) 5749 goto failed_mount9; 5750 } 5751 5752 if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev)) { 5753 ext4_msg(sb, KERN_WARNING, 5754 "mounting with \"discard\" option, but the device does not support discard"); 5755 clear_opt(sb, DISCARD); 5756 } 5757 5758 if (es->s_error_count) { 5759 sbi->s_err_report_sec = 5*60; /* first time 5 minutes */ 5760 mod_timer(&sbi->s_err_report, 5761 jiffies + secs_to_jiffies(sbi->s_err_report_sec)); 5762 } 5763 sbi->s_err_report_sec = 24*60*60; /* Once a day */ 5764 5765 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ 5766 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); 5767 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); 5768 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); 5769 atomic_set(&sbi->s_warning_count, 0); 5770 atomic_set(&sbi->s_msg_count, 0); 5771 5772 /* Register sysfs after all initializations are complete. */ 5773 err = ext4_register_sysfs(sb); 5774 if (err) 5775 goto failed_mount9; 5776 5777 return 0; 5778 5779 failed_mount9: 5780 /* Drain deferred EA inode iputs before quota shutdown */ 5781 flush_delayed_work(&sbi->s_ea_inode_work); 5782 ext4_quotas_off(sb, EXT4_MAXQUOTAS); 5783 failed_mount8: __maybe_unused 5784 ext4_release_orphan_info(sb); 5785 failed_mount7: 5786 ext4_unregister_li_request(sb); 5787 failed_mount6: 5788 ext4_mb_release(sb); 5789 ext4_flex_groups_free(sbi); 5790 failed_mount5: 5791 ext4_percpu_param_destroy(sbi); 5792 ext4_ext_release(sb); 5793 ext4_release_system_zone(sb); 5794 failed_mount4a: 5795 dput(sb->s_root); 5796 sb->s_root = NULL; 5797 failed_mount4: 5798 ext4_msg(sb, KERN_ERR, "mount failed"); 5799 if (EXT4_SB(sb)->rsv_conversion_wq) 5800 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); 5801 failed_mount_wq: 5802 /* Drain deferred EA inode iputs before freeing structures */ 5803 flush_delayed_work(&sbi->s_ea_inode_work); 5804 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); 5805 sbi->s_ea_inode_cache = NULL; 5806 5807 ext4_xattr_destroy_cache(sbi->s_ea_block_cache); 5808 sbi->s_ea_block_cache = NULL; 5809 5810 if (sbi->s_journal) { 5811 ext4_journal_destroy(sbi, sbi->s_journal); 5812 } 5813 failed_mount3a: 5814 /* Drain deferred EA inode iputs from journal replay */ 5815 flush_delayed_work(&sbi->s_ea_inode_work); 5816 ext4_es_unregister_shrinker(sbi); 5817 ext4_es_destroy_stats(sbi); 5818 failed_mount3: 5819 /* flush s_sb_upd_work before sbi destroy */ 5820 flush_work(&sbi->s_sb_upd_work); 5821 ext4_stop_mmpd(sbi); 5822 timer_delete_sync(&sbi->s_err_report); 5823 ext4_group_desc_free(sbi); 5824 failed_mount: 5825 #if IS_ENABLED(CONFIG_UNICODE) 5826 utf8_unload(sb->s_encoding); 5827 #endif 5828 5829 #ifdef CONFIG_QUOTA 5830 for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++) 5831 kfree(get_qf_name(sb, sbi, i)); 5832 #endif 5833 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy); 5834 brelse(sbi->s_sbh); 5835 if (sbi->s_journal_bdev_file) { 5836 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file)); 5837 fs_bdev_file_release(sbi->s_journal_bdev_file, sb); 5838 } 5839 out_fail: 5840 invalidate_bdev(sb->s_bdev); 5841 sb->s_fs_info = NULL; 5842 return err; 5843 } 5844 5845 static int ext4_fill_super(struct super_block *sb, struct fs_context *fc) 5846 { 5847 struct ext4_fs_context *ctx = fc->fs_private; 5848 struct ext4_sb_info *sbi; 5849 const char *descr; 5850 int ret; 5851 5852 sbi = ext4_alloc_sbi(sb); 5853 if (!sbi) 5854 return -ENOMEM; 5855 5856 fc->s_fs_info = sbi; 5857 5858 /* Cleanup superblock name */ 5859 strreplace(sb->s_id, '/', '!'); 5860 5861 sbi->s_sb_block = 1; /* Default super block location */ 5862 if (ctx->spec & EXT4_SPEC_s_sb_block) 5863 sbi->s_sb_block = ctx->s_sb_block; 5864 5865 ret = __ext4_fill_super(fc, sb); 5866 if (ret < 0) 5867 goto free_sbi; 5868 5869 if (sbi->s_journal) { 5870 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 5871 descr = " journalled data mode"; 5872 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 5873 descr = " ordered data mode"; 5874 else 5875 descr = " writeback data mode"; 5876 } else 5877 descr = "out journal"; 5878 5879 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount")) 5880 ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. " 5881 "Quota mode: %s.", &sb->s_uuid, 5882 sb_rdonly(sb) ? "ro" : "r/w", descr, 5883 ext4_quota_mode(sb)); 5884 5885 /* Update the s_overhead_clusters if necessary */ 5886 ext4_update_overhead(sb, false); 5887 return 0; 5888 5889 free_sbi: 5890 ext4_free_sbi(sbi); 5891 fc->s_fs_info = NULL; 5892 return ret; 5893 } 5894 5895 static int ext4_get_tree(struct fs_context *fc) 5896 { 5897 return get_tree_bdev(fc, ext4_fill_super); 5898 } 5899 5900 /* 5901 * Setup any per-fs journal parameters now. We'll do this both on 5902 * initial mount, once the journal has been initialised but before we've 5903 * done any recovery; and again on any subsequent remount. 5904 */ 5905 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 5906 { 5907 struct ext4_sb_info *sbi = EXT4_SB(sb); 5908 5909 journal->j_commit_interval = sbi->s_commit_interval; 5910 journal->j_min_batch_time = sbi->s_min_batch_time; 5911 journal->j_max_batch_time = sbi->s_max_batch_time; 5912 ext4_fc_init(sb, journal); 5913 5914 write_lock(&journal->j_state_lock); 5915 if (test_opt(sb, BARRIER)) 5916 journal->j_flags |= JBD2_BARRIER; 5917 else 5918 journal->j_flags &= ~JBD2_BARRIER; 5919 /* 5920 * Always enable journal cycle record option, letting the journal 5921 * records log transactions continuously between each mount. 5922 */ 5923 journal->j_flags |= JBD2_CYCLE_RECORD; 5924 write_unlock(&journal->j_state_lock); 5925 } 5926 5927 static struct inode *ext4_get_journal_inode(struct super_block *sb, 5928 unsigned int journal_inum) 5929 { 5930 struct inode *journal_inode; 5931 5932 /* 5933 * Test for the existence of a valid inode on disk. Bad things 5934 * happen if we iget() an unused inode, as the subsequent iput() 5935 * will try to delete it. 5936 */ 5937 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL); 5938 if (IS_ERR(journal_inode)) { 5939 ext4_msg(sb, KERN_ERR, "no journal found"); 5940 return ERR_CAST(journal_inode); 5941 } 5942 if (!journal_inode->i_nlink) { 5943 make_bad_inode(journal_inode); 5944 iput(journal_inode); 5945 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 5946 return ERR_PTR(-EFSCORRUPTED); 5947 } 5948 if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) { 5949 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 5950 iput(journal_inode); 5951 return ERR_PTR(-EFSCORRUPTED); 5952 } 5953 5954 #ifdef CONFIG_LOCKDEP 5955 lockdep_set_subclass(&EXT4_I(journal_inode)->i_data_sem, 5956 I_DATA_SEM_JOURNAL); 5957 #endif 5958 5959 ext4_debug("Journal inode found at %p: %lld bytes\n", 5960 journal_inode, journal_inode->i_size); 5961 return journal_inode; 5962 } 5963 5964 static int ext4_journal_bmap(journal_t *journal, sector_t *block) 5965 { 5966 struct ext4_map_blocks map; 5967 int ret; 5968 5969 if (journal->j_inode == NULL) 5970 return 0; 5971 5972 map.m_lblk = *block; 5973 map.m_len = 1; 5974 ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0); 5975 if (ret <= 0) { 5976 ext4_msg(journal->j_inode->i_sb, KERN_CRIT, 5977 "journal bmap failed: block %llu ret %d\n", 5978 *block, ret); 5979 jbd2_journal_abort(journal, ret ? ret : -EFSCORRUPTED); 5980 return ret; 5981 } 5982 *block = map.m_pblk; 5983 return 0; 5984 } 5985 5986 static journal_t *ext4_open_inode_journal(struct super_block *sb, 5987 unsigned int journal_inum) 5988 { 5989 struct inode *journal_inode; 5990 journal_t *journal; 5991 5992 journal_inode = ext4_get_journal_inode(sb, journal_inum); 5993 if (IS_ERR(journal_inode)) 5994 return ERR_CAST(journal_inode); 5995 5996 journal = jbd2_journal_init_inode(journal_inode); 5997 if (IS_ERR(journal)) { 5998 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 5999 iput(journal_inode); 6000 return ERR_CAST(journal); 6001 } 6002 journal->j_private = sb; 6003 journal->j_bmap = ext4_journal_bmap; 6004 ext4_init_journal_params(sb, journal); 6005 return journal; 6006 } 6007 6008 static struct file *ext4_get_journal_blkdev(struct super_block *sb, 6009 dev_t j_dev, ext4_fsblk_t *j_start, 6010 ext4_fsblk_t *j_len) 6011 { 6012 struct buffer_head *bh; 6013 struct block_device *bdev; 6014 struct file *bdev_file; 6015 int hblock, blocksize; 6016 ext4_fsblk_t sb_block; 6017 unsigned long offset; 6018 struct ext4_super_block *es; 6019 int errno; 6020 6021 bdev_file = fs_bdev_file_open_by_dev(j_dev, 6022 BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES, 6023 sb, sb); 6024 if (IS_ERR(bdev_file)) { 6025 ext4_msg(sb, KERN_ERR, 6026 "failed to open journal device unknown-block(%u,%u) %pe", 6027 MAJOR(j_dev), MINOR(j_dev), bdev_file); 6028 return bdev_file; 6029 } 6030 6031 bdev = file_bdev(bdev_file); 6032 blocksize = sb->s_blocksize; 6033 hblock = bdev_logical_block_size(bdev); 6034 if (blocksize < hblock) { 6035 ext4_msg(sb, KERN_ERR, 6036 "blocksize too small for journal device"); 6037 errno = -EINVAL; 6038 goto out_bdev; 6039 } 6040 6041 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 6042 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 6043 set_blocksize(bdev_file, blocksize); 6044 bh = __bread(bdev, sb_block, blocksize); 6045 if (!bh) { 6046 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 6047 "external journal"); 6048 errno = -EINVAL; 6049 goto out_bdev; 6050 } 6051 6052 es = (struct ext4_super_block *) (bh->b_data + offset); 6053 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 6054 !(le32_to_cpu(es->s_feature_incompat) & 6055 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 6056 ext4_msg(sb, KERN_ERR, "external journal has bad superblock"); 6057 errno = -EFSCORRUPTED; 6058 goto out_bh; 6059 } 6060 6061 if ((le32_to_cpu(es->s_feature_ro_compat) & 6062 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 6063 es->s_checksum != ext4_superblock_csum(es)) { 6064 ext4_msg(sb, KERN_ERR, "external journal has corrupt superblock"); 6065 errno = -EFSCORRUPTED; 6066 goto out_bh; 6067 } 6068 6069 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 6070 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 6071 errno = -EFSCORRUPTED; 6072 goto out_bh; 6073 } 6074 6075 *j_start = sb_block + 1; 6076 *j_len = ext4_blocks_count(es); 6077 brelse(bh); 6078 return bdev_file; 6079 6080 out_bh: 6081 brelse(bh); 6082 out_bdev: 6083 fs_bdev_file_release(bdev_file, sb); 6084 return ERR_PTR(errno); 6085 } 6086 6087 static journal_t *ext4_open_dev_journal(struct super_block *sb, 6088 dev_t j_dev) 6089 { 6090 journal_t *journal; 6091 ext4_fsblk_t j_start; 6092 ext4_fsblk_t j_len; 6093 struct file *bdev_file; 6094 int errno = 0; 6095 6096 bdev_file = ext4_get_journal_blkdev(sb, j_dev, &j_start, &j_len); 6097 if (IS_ERR(bdev_file)) 6098 return ERR_CAST(bdev_file); 6099 6100 journal = jbd2_journal_init_dev(file_bdev(bdev_file), sb->s_bdev, j_start, 6101 j_len, sb->s_blocksize); 6102 if (IS_ERR(journal)) { 6103 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 6104 errno = PTR_ERR(journal); 6105 goto out_bdev; 6106 } 6107 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 6108 ext4_msg(sb, KERN_ERR, "External journal has more than one " 6109 "user (unsupported) - %d", 6110 be32_to_cpu(journal->j_superblock->s_nr_users)); 6111 errno = -EINVAL; 6112 goto out_journal; 6113 } 6114 journal->j_private = sb; 6115 EXT4_SB(sb)->s_journal_bdev_file = bdev_file; 6116 ext4_init_journal_params(sb, journal); 6117 return journal; 6118 6119 out_journal: 6120 ext4_journal_destroy(EXT4_SB(sb), journal); 6121 out_bdev: 6122 fs_bdev_file_release(bdev_file, sb); 6123 return ERR_PTR(errno); 6124 } 6125 6126 static int ext4_load_journal(struct super_block *sb, 6127 struct ext4_super_block *es, 6128 unsigned long journal_devnum) 6129 { 6130 journal_t *journal; 6131 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 6132 dev_t journal_dev; 6133 int err = 0; 6134 int really_read_only; 6135 int journal_dev_ro; 6136 6137 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb))) 6138 return -EFSCORRUPTED; 6139 6140 if (journal_devnum && 6141 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 6142 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 6143 "numbers have changed"); 6144 journal_dev = new_decode_dev(journal_devnum); 6145 } else 6146 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 6147 6148 if (journal_inum && journal_dev) { 6149 ext4_msg(sb, KERN_ERR, 6150 "filesystem has both journal inode and journal device!"); 6151 return -EINVAL; 6152 } 6153 6154 if (journal_inum) { 6155 journal = ext4_open_inode_journal(sb, journal_inum); 6156 if (IS_ERR(journal)) 6157 return PTR_ERR(journal); 6158 } else { 6159 journal = ext4_open_dev_journal(sb, journal_dev); 6160 if (IS_ERR(journal)) 6161 return PTR_ERR(journal); 6162 } 6163 6164 journal_dev_ro = bdev_read_only(journal->j_dev); 6165 really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro; 6166 6167 if (journal_dev_ro && !sb_rdonly(sb)) { 6168 ext4_msg(sb, KERN_ERR, 6169 "journal device read-only, try mounting with '-o ro'"); 6170 err = -EROFS; 6171 goto err_out; 6172 } 6173 6174 /* 6175 * Are we loading a blank journal or performing recovery after a 6176 * crash? For recovery, we need to check in advance whether we 6177 * can get read-write access to the device. 6178 */ 6179 if (ext4_has_feature_journal_needs_recovery(sb)) { 6180 if (sb_rdonly(sb)) { 6181 ext4_msg(sb, KERN_INFO, "INFO: recovery " 6182 "required on readonly filesystem"); 6183 if (really_read_only) { 6184 ext4_msg(sb, KERN_ERR, "write access " 6185 "unavailable, cannot proceed " 6186 "(try mounting with noload)"); 6187 err = -EROFS; 6188 goto err_out; 6189 } 6190 ext4_msg(sb, KERN_INFO, "write access will " 6191 "be enabled during recovery"); 6192 } 6193 } 6194 6195 if (!(journal->j_flags & JBD2_BARRIER)) 6196 ext4_msg(sb, KERN_INFO, "barriers disabled"); 6197 6198 if (!ext4_has_feature_journal_needs_recovery(sb)) 6199 err = jbd2_journal_wipe(journal, !really_read_only); 6200 if (!err) { 6201 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 6202 __le16 orig_state; 6203 bool changed = false; 6204 6205 if (save) 6206 memcpy(save, ((char *) es) + 6207 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 6208 err = jbd2_journal_load(journal); 6209 if (save && memcmp(((char *) es) + EXT4_S_ERR_START, 6210 save, EXT4_S_ERR_LEN)) { 6211 memcpy(((char *) es) + EXT4_S_ERR_START, 6212 save, EXT4_S_ERR_LEN); 6213 changed = true; 6214 } 6215 kfree(save); 6216 orig_state = es->s_state; 6217 es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state & 6218 EXT4_ERROR_FS); 6219 if (orig_state != es->s_state) 6220 changed = true; 6221 /* Write out restored error information to the superblock */ 6222 if (changed && !really_read_only) { 6223 int err2; 6224 err2 = ext4_commit_super(sb); 6225 err = err ? : err2; 6226 } 6227 } 6228 6229 if (err) { 6230 ext4_msg(sb, KERN_ERR, "error loading journal"); 6231 goto err_out; 6232 } 6233 6234 EXT4_SB(sb)->s_journal = journal; 6235 err = ext4_clear_journal_err(sb, es); 6236 if (err) { 6237 ext4_journal_destroy(EXT4_SB(sb), journal); 6238 return err; 6239 } 6240 6241 if (!really_read_only && journal_devnum && 6242 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 6243 es->s_journal_dev = cpu_to_le32(journal_devnum); 6244 ext4_commit_super(sb); 6245 } 6246 if (!really_read_only && journal_inum && 6247 journal_inum != le32_to_cpu(es->s_journal_inum)) { 6248 es->s_journal_inum = cpu_to_le32(journal_inum); 6249 ext4_commit_super(sb); 6250 } 6251 6252 return 0; 6253 6254 err_out: 6255 ext4_journal_destroy(EXT4_SB(sb), journal); 6256 return err; 6257 } 6258 6259 /* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */ 6260 static void ext4_update_super(struct super_block *sb) 6261 { 6262 struct ext4_sb_info *sbi = EXT4_SB(sb); 6263 struct ext4_super_block *es = sbi->s_es; 6264 struct buffer_head *sbh = sbi->s_sbh; 6265 6266 lock_buffer(sbh); 6267 /* 6268 * If the file system is mounted read-only, don't update the 6269 * superblock write time. This avoids updating the superblock 6270 * write time when we are mounting the root file system 6271 * read/only but we need to replay the journal; at that point, 6272 * for people who are east of GMT and who make their clock 6273 * tick in localtime for Windows bug-for-bug compatibility, 6274 * the clock is set in the future, and this will cause e2fsck 6275 * to complain and force a full file system check. 6276 */ 6277 if (!sb_rdonly(sb)) 6278 ext4_update_tstamp(es, s_wtime); 6279 es->s_kbytes_written = 6280 cpu_to_le64(sbi->s_kbytes_written + 6281 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 6282 sbi->s_sectors_written_start) >> 1)); 6283 if (percpu_counter_initialized(&sbi->s_freeclusters_counter)) 6284 ext4_free_blocks_count_set(es, 6285 EXT4_C2B(sbi, percpu_counter_sum_positive( 6286 &sbi->s_freeclusters_counter))); 6287 if (percpu_counter_initialized(&sbi->s_freeinodes_counter)) 6288 es->s_free_inodes_count = 6289 cpu_to_le32(percpu_counter_sum_positive( 6290 &sbi->s_freeinodes_counter)); 6291 /* Copy error information to the on-disk superblock */ 6292 spin_lock(&sbi->s_error_lock); 6293 if (sbi->s_add_error_count > 0) { 6294 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 6295 if (!es->s_first_error_time && !es->s_first_error_time_hi) { 6296 __ext4_update_tstamp(&es->s_first_error_time, 6297 &es->s_first_error_time_hi, 6298 sbi->s_first_error_time); 6299 strtomem_pad(es->s_first_error_func, 6300 sbi->s_first_error_func, 0); 6301 es->s_first_error_line = 6302 cpu_to_le32(sbi->s_first_error_line); 6303 es->s_first_error_ino = 6304 cpu_to_le32(sbi->s_first_error_ino); 6305 es->s_first_error_block = 6306 cpu_to_le64(sbi->s_first_error_block); 6307 es->s_first_error_errcode = 6308 ext4_errno_to_code(sbi->s_first_error_code); 6309 } 6310 __ext4_update_tstamp(&es->s_last_error_time, 6311 &es->s_last_error_time_hi, 6312 sbi->s_last_error_time); 6313 strtomem_pad(es->s_last_error_func, sbi->s_last_error_func, 0); 6314 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line); 6315 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino); 6316 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block); 6317 es->s_last_error_errcode = 6318 ext4_errno_to_code(sbi->s_last_error_code); 6319 /* 6320 * Start the daily error reporting function if it hasn't been 6321 * started already and sbi->s_err_report_sec is not zero 6322 */ 6323 if (!es->s_error_count && !sbi->s_err_report_sec) 6324 mod_timer(&sbi->s_err_report, 6325 jiffies + secs_to_jiffies(sbi->s_err_report_sec)); 6326 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count); 6327 sbi->s_add_error_count = 0; 6328 } 6329 spin_unlock(&sbi->s_error_lock); 6330 6331 ext4_superblock_csum_set(sb); 6332 unlock_buffer(sbh); 6333 } 6334 6335 static int ext4_commit_super(struct super_block *sb) 6336 { 6337 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 6338 6339 if (!sbh) 6340 return -EINVAL; 6341 6342 ext4_update_super(sb); 6343 6344 lock_buffer(sbh); 6345 /* Buffer got discarded which means block device got invalidated */ 6346 if (!buffer_mapped(sbh)) { 6347 unlock_buffer(sbh); 6348 return -EIO; 6349 } 6350 6351 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) { 6352 /* 6353 * Oh, dear. A previous attempt to write the 6354 * superblock failed. This could happen because the 6355 * USB device was yanked out. Or it could happen to 6356 * be a transient write error and maybe the block will 6357 * be remapped. Nothing we can do but to retry the 6358 * write and hope for the best. 6359 */ 6360 ext4_msg(sb, KERN_ERR, "previous I/O error to " 6361 "superblock detected"); 6362 clear_buffer_write_io_error(sbh); 6363 set_buffer_uptodate(sbh); 6364 } 6365 /* Clear potential dirty bit if it was journalled update */ 6366 clear_buffer_dirty(sbh); 6367 bh_submit(sbh, REQ_OP_WRITE | REQ_SYNC | 6368 (test_opt(sb, BARRIER) ? REQ_FUA : 0), bh_end_write); 6369 wait_on_buffer(sbh); 6370 if (buffer_write_io_error(sbh)) { 6371 ext4_msg(sb, KERN_ERR, "I/O error while writing " 6372 "superblock"); 6373 clear_buffer_write_io_error(sbh); 6374 set_buffer_uptodate(sbh); 6375 return -EIO; 6376 } 6377 return 0; 6378 } 6379 6380 /* 6381 * Have we just finished recovery? If so, and if we are mounting (or 6382 * remounting) the filesystem readonly, then we will end up with a 6383 * consistent fs on disk. Record that fact. 6384 */ 6385 static int ext4_mark_recovery_complete(struct super_block *sb, 6386 struct ext4_super_block *es) 6387 { 6388 int err; 6389 journal_t *journal = EXT4_SB(sb)->s_journal; 6390 6391 if (!ext4_has_feature_journal(sb)) { 6392 if (journal != NULL) { 6393 ext4_error(sb, "Journal got removed while the fs was " 6394 "mounted!"); 6395 return -EFSCORRUPTED; 6396 } 6397 return 0; 6398 } 6399 jbd2_journal_lock_updates(journal); 6400 err = jbd2_journal_flush(journal, 0); 6401 if (err < 0) 6402 goto out; 6403 6404 if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) || 6405 ext4_has_feature_orphan_present(sb))) { 6406 if (!ext4_orphan_file_empty(sb)) { 6407 ext4_error(sb, "Orphan file not empty on read-only fs."); 6408 err = -EFSCORRUPTED; 6409 goto out; 6410 } 6411 ext4_clear_feature_journal_needs_recovery(sb); 6412 ext4_clear_feature_orphan_present(sb); 6413 ext4_commit_super(sb); 6414 } 6415 out: 6416 jbd2_journal_unlock_updates(journal); 6417 return err; 6418 } 6419 6420 /* 6421 * If we are mounting (or read-write remounting) a filesystem whose journal 6422 * has recorded an error from a previous lifetime, move that error to the 6423 * main filesystem now. 6424 */ 6425 static int ext4_clear_journal_err(struct super_block *sb, 6426 struct ext4_super_block *es) 6427 { 6428 journal_t *journal; 6429 int j_errno; 6430 const char *errstr; 6431 6432 if (!ext4_has_feature_journal(sb)) { 6433 ext4_error(sb, "Journal got removed while the fs was mounted!"); 6434 return -EFSCORRUPTED; 6435 } 6436 6437 journal = EXT4_SB(sb)->s_journal; 6438 6439 /* 6440 * Now check for any error status which may have been recorded in the 6441 * journal by a prior ext4_error() or ext4_abort() 6442 */ 6443 6444 j_errno = jbd2_journal_errno(journal); 6445 if (j_errno) { 6446 char nbuf[16]; 6447 6448 errstr = ext4_decode_error(sb, j_errno, nbuf); 6449 ext4_warning(sb, "Filesystem error recorded " 6450 "from previous mount: %s", errstr); 6451 6452 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 6453 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 6454 j_errno = ext4_commit_super(sb); 6455 if (j_errno) 6456 return j_errno; 6457 ext4_warning(sb, "Marked fs in need of filesystem check."); 6458 6459 jbd2_journal_clear_err(journal); 6460 jbd2_journal_update_sb_errno(journal); 6461 } 6462 return 0; 6463 } 6464 6465 /* 6466 * Force the running and committing transactions to commit, 6467 * and wait on the commit. 6468 */ 6469 int ext4_force_commit(struct super_block *sb) 6470 { 6471 return ext4_journal_force_commit(EXT4_SB(sb)->s_journal); 6472 } 6473 6474 static int ext4_sync_fs(struct super_block *sb, int wait) 6475 { 6476 int ret = 0; 6477 tid_t target; 6478 bool needs_barrier = false; 6479 struct ext4_sb_info *sbi = EXT4_SB(sb); 6480 6481 ret = ext4_emergency_state(sb); 6482 if (unlikely(ret)) 6483 return ret; 6484 6485 trace_ext4_sync_fs(sb, wait); 6486 flush_workqueue(sbi->rsv_conversion_wq); 6487 flush_delayed_work(&sbi->s_ea_inode_work); 6488 /* 6489 * Writeback quota in non-journalled quota case - journalled quota has 6490 * no dirty dquots 6491 */ 6492 dquot_writeback_dquots(sb, -1); 6493 /* 6494 * Data writeback is possible w/o journal transaction, so barrier must 6495 * being sent at the end of the function. But we can skip it if 6496 * transaction_commit will do it for us. 6497 */ 6498 if (sbi->s_journal) { 6499 target = jbd2_get_latest_transaction(sbi->s_journal); 6500 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && 6501 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) 6502 needs_barrier = true; 6503 6504 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 6505 if (wait) 6506 ret = jbd2_log_wait_commit(sbi->s_journal, 6507 target); 6508 } 6509 } else if (wait && test_opt(sb, BARRIER)) 6510 needs_barrier = true; 6511 if (needs_barrier) { 6512 int err; 6513 err = blkdev_issue_flush(sb->s_bdev); 6514 if (!ret) 6515 ret = err; 6516 } 6517 6518 return ret; 6519 } 6520 6521 /* 6522 * LVM calls this function before a (read-only) snapshot is created. This 6523 * gives us a chance to flush the journal completely and mark the fs clean. 6524 * 6525 * Note that only this function cannot bring a filesystem to be in a clean 6526 * state independently. It relies on upper layer to stop all data & metadata 6527 * modifications. 6528 */ 6529 static int ext4_freeze(struct super_block *sb) 6530 { 6531 int error = 0; 6532 journal_t *journal = EXT4_SB(sb)->s_journal; 6533 6534 if (journal) { 6535 /* Now we set up the journal barrier. */ 6536 jbd2_journal_lock_updates(journal); 6537 6538 /* 6539 * Don't clear the needs_recovery flag if we failed to 6540 * flush the journal. 6541 */ 6542 error = jbd2_journal_flush(journal, 0); 6543 if (error < 0) 6544 goto out; 6545 6546 /* Journal blocked and flushed, clear needs_recovery flag. */ 6547 ext4_clear_feature_journal_needs_recovery(sb); 6548 if (ext4_orphan_file_empty(sb)) 6549 ext4_clear_feature_orphan_present(sb); 6550 } 6551 6552 error = ext4_commit_super(sb); 6553 out: 6554 if (journal) 6555 /* we rely on upper layer to stop further updates */ 6556 jbd2_journal_unlock_updates(journal); 6557 return error; 6558 } 6559 6560 /* 6561 * Called by LVM after the snapshot is done. We need to reset the RECOVER 6562 * flag here, even though the filesystem is not technically dirty yet. 6563 */ 6564 static int ext4_unfreeze(struct super_block *sb) 6565 { 6566 if (ext4_emergency_state(sb)) 6567 return 0; 6568 6569 if (EXT4_SB(sb)->s_journal) { 6570 /* Reset the needs_recovery flag before the fs is unlocked. */ 6571 ext4_set_feature_journal_needs_recovery(sb); 6572 if (ext4_has_feature_orphan_file(sb)) 6573 ext4_set_feature_orphan_present(sb); 6574 } 6575 6576 ext4_commit_super(sb); 6577 return 0; 6578 } 6579 6580 /* 6581 * Structure to save mount options for ext4_remount's benefit 6582 */ 6583 struct ext4_mount_options { 6584 unsigned long s_mount_opt; 6585 unsigned long s_mount_opt2; 6586 kuid_t s_resuid; 6587 kgid_t s_resgid; 6588 unsigned long s_commit_interval; 6589 u32 s_min_batch_time, s_max_batch_time; 6590 #ifdef CONFIG_QUOTA 6591 int s_jquota_fmt; 6592 char *s_qf_names[EXT4_MAXQUOTAS]; 6593 #endif 6594 }; 6595 6596 static int __ext4_remount(struct fs_context *fc, struct super_block *sb) 6597 { 6598 struct ext4_fs_context *ctx = fc->fs_private; 6599 struct ext4_super_block *es; 6600 struct ext4_sb_info *sbi = EXT4_SB(sb); 6601 unsigned long old_sb_flags; 6602 struct ext4_mount_options old_opts; 6603 ext4_group_t g; 6604 int err = 0; 6605 int alloc_ctx; 6606 #ifdef CONFIG_QUOTA 6607 int enable_quota = 0; 6608 int i, j; 6609 char *to_free[EXT4_MAXQUOTAS]; 6610 #endif 6611 6612 6613 /* Store the original options */ 6614 old_sb_flags = sb->s_flags; 6615 old_opts.s_mount_opt = sbi->s_mount_opt; 6616 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 6617 old_opts.s_resuid = sbi->s_resuid; 6618 old_opts.s_resgid = sbi->s_resgid; 6619 old_opts.s_commit_interval = sbi->s_commit_interval; 6620 old_opts.s_min_batch_time = sbi->s_min_batch_time; 6621 old_opts.s_max_batch_time = sbi->s_max_batch_time; 6622 #ifdef CONFIG_QUOTA 6623 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 6624 for (i = 0; i < EXT4_MAXQUOTAS; i++) 6625 if (sbi->s_qf_names[i]) { 6626 char *qf_name = get_qf_name(sb, sbi, i); 6627 6628 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL); 6629 if (!old_opts.s_qf_names[i]) { 6630 for (j = 0; j < i; j++) 6631 kfree(old_opts.s_qf_names[j]); 6632 return -ENOMEM; 6633 } 6634 } else 6635 old_opts.s_qf_names[i] = NULL; 6636 #endif 6637 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) { 6638 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 6639 ctx->journal_ioprio = 6640 sbi->s_journal->j_task->io_context->ioprio; 6641 else 6642 ctx->journal_ioprio = EXT4_DEF_JOURNAL_IOPRIO; 6643 6644 } 6645 6646 if ((ctx->spec & EXT4_SPEC_s_stripe) && 6647 ext4_is_stripe_incompatible(sb, ctx->s_stripe)) { 6648 ext4_msg(sb, KERN_WARNING, 6649 "stripe (%lu) is not aligned with cluster size (%u), " 6650 "stripe is disabled", 6651 ctx->s_stripe, sbi->s_cluster_ratio); 6652 ctx->s_stripe = 0; 6653 } 6654 6655 /* 6656 * Changing the DIOREAD_NOLOCK or DELALLOC mount options may cause 6657 * two calls to ext4_should_dioread_nolock() to return inconsistent 6658 * values, triggering WARN_ON in ext4_add_complete_io(). we grab 6659 * here s_writepages_rwsem to avoid race between writepages ops and 6660 * remount. 6661 */ 6662 alloc_ctx = ext4_writepages_down_write(sb); 6663 ext4_apply_options(fc, sb); 6664 ext4_writepages_up_write(sb, alloc_ctx); 6665 6666 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ 6667 test_opt(sb, JOURNAL_CHECKSUM)) { 6668 ext4_msg(sb, KERN_ERR, "changing journal_checksum " 6669 "during remount not supported; ignoring"); 6670 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; 6671 } 6672 6673 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 6674 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 6675 ext4_msg(sb, KERN_ERR, "can't mount with " 6676 "both data=journal and delalloc"); 6677 err = -EINVAL; 6678 goto restore_opts; 6679 } 6680 if (test_opt(sb, DIOREAD_NOLOCK)) { 6681 ext4_msg(sb, KERN_ERR, "can't mount with " 6682 "both data=journal and dioread_nolock"); 6683 err = -EINVAL; 6684 goto restore_opts; 6685 } 6686 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) { 6687 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 6688 ext4_msg(sb, KERN_ERR, "can't mount with " 6689 "journal_async_commit in data=ordered mode"); 6690 err = -EINVAL; 6691 goto restore_opts; 6692 } 6693 } 6694 6695 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) { 6696 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount"); 6697 err = -EINVAL; 6698 goto restore_opts; 6699 } 6700 6701 if ((old_opts.s_mount_opt & EXT4_MOUNT_DELALLOC) && 6702 !test_opt(sb, DELALLOC)) { 6703 ext4_msg(sb, KERN_ERR, "can't disable delalloc during remount"); 6704 err = -EINVAL; 6705 goto restore_opts; 6706 } 6707 6708 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 6709 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 6710 6711 es = sbi->s_es; 6712 6713 if (sbi->s_journal) { 6714 ext4_init_journal_params(sb, sbi->s_journal); 6715 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio); 6716 } 6717 6718 /* Flush outstanding errors before changing fs state */ 6719 flush_work(&sbi->s_sb_upd_work); 6720 6721 if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) { 6722 if (ext4_emergency_state(sb)) { 6723 err = -EROFS; 6724 goto restore_opts; 6725 } 6726 6727 if (fc->sb_flags & SB_RDONLY) { 6728 err = sync_filesystem(sb); 6729 if (err < 0) 6730 goto restore_opts; 6731 err = dquot_suspend(sb, -1); 6732 if (err < 0) 6733 goto restore_opts; 6734 6735 /* 6736 * First of all, the unconditional stuff we have to do 6737 * to disable replay of the journal when we next remount 6738 */ 6739 sb->s_flags |= SB_RDONLY; 6740 6741 /* 6742 * OK, test if we are remounting a valid rw partition 6743 * readonly, and if so set the rdonly flag and then 6744 * mark the partition as valid again. 6745 */ 6746 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 6747 (sbi->s_mount_state & EXT4_VALID_FS)) 6748 es->s_state = cpu_to_le16(sbi->s_mount_state); 6749 6750 if (sbi->s_journal) { 6751 /* 6752 * We let remount-ro finish even if marking fs 6753 * as clean failed... 6754 */ 6755 ext4_mark_recovery_complete(sb, es); 6756 } 6757 } else { 6758 /* Make sure we can mount this feature set readwrite */ 6759 if (ext4_has_feature_readonly(sb) || 6760 !ext4_feature_set_ok(sb, 0)) { 6761 err = -EROFS; 6762 goto restore_opts; 6763 } 6764 /* 6765 * Make sure the group descriptor checksums 6766 * are sane. If they aren't, refuse to remount r/w. 6767 */ 6768 for (g = 0; g < sbi->s_groups_count; g++) { 6769 struct ext4_group_desc *gdp = 6770 ext4_get_group_desc(sb, g, NULL); 6771 6772 if (!ext4_group_desc_csum_verify(sb, g, gdp)) { 6773 ext4_msg(sb, KERN_ERR, 6774 "ext4_remount: Checksum for group %u failed (%u!=%u)", 6775 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)), 6776 le16_to_cpu(gdp->bg_checksum)); 6777 err = -EFSBADCRC; 6778 goto restore_opts; 6779 } 6780 } 6781 6782 /* 6783 * If we have an unprocessed orphan list hanging 6784 * around from a previously readonly bdev mount, 6785 * require a full umount/remount for now. 6786 */ 6787 if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) { 6788 ext4_msg(sb, KERN_WARNING, "Couldn't " 6789 "remount RDWR because of unprocessed " 6790 "orphan inode list. Please " 6791 "umount/remount instead"); 6792 err = -EINVAL; 6793 goto restore_opts; 6794 } 6795 6796 /* 6797 * Mounting a RDONLY partition read-write, so reread 6798 * and store the current valid flag. (It may have 6799 * been changed by e2fsck since we originally mounted 6800 * the partition.) 6801 */ 6802 if (sbi->s_journal) { 6803 err = ext4_clear_journal_err(sb, es); 6804 if (err) 6805 goto restore_opts; 6806 } 6807 sbi->s_mount_state = (le16_to_cpu(es->s_state) & 6808 ~EXT4_FC_REPLAY); 6809 6810 err = ext4_setup_super(sb, es, 0); 6811 if (err) 6812 goto restore_opts; 6813 6814 sb->s_flags &= ~SB_RDONLY; 6815 if (ext4_has_feature_mmp(sb)) { 6816 err = ext4_multi_mount_protect(sb, 6817 le64_to_cpu(es->s_mmp_block)); 6818 if (err) 6819 goto restore_opts; 6820 } 6821 #ifdef CONFIG_QUOTA 6822 enable_quota = 1; 6823 #endif 6824 } 6825 } 6826 6827 /* 6828 * Handle creation of system zone data early because it can fail. 6829 * Releasing of existing data is done when we are sure remount will 6830 * succeed. 6831 */ 6832 if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) { 6833 err = ext4_setup_system_zone(sb); 6834 if (err) 6835 goto restore_opts; 6836 } 6837 6838 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) { 6839 err = ext4_commit_super(sb); 6840 if (err) 6841 goto restore_opts; 6842 } 6843 6844 #ifdef CONFIG_QUOTA 6845 if (enable_quota) { 6846 if (sb_any_quota_suspended(sb)) 6847 dquot_resume(sb, -1); 6848 else if (ext4_has_feature_quota(sb)) { 6849 err = ext4_enable_quotas(sb); 6850 if (err) 6851 goto restore_opts; 6852 } 6853 } 6854 /* Release old quota file names */ 6855 for (i = 0; i < EXT4_MAXQUOTAS; i++) 6856 kfree(old_opts.s_qf_names[i]); 6857 #endif 6858 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks) 6859 ext4_release_system_zone(sb); 6860 6861 /* 6862 * Reinitialize lazy itable initialization thread based on 6863 * current settings 6864 */ 6865 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE)) 6866 ext4_unregister_li_request(sb); 6867 else { 6868 ext4_group_t first_not_zeroed; 6869 first_not_zeroed = ext4_has_uninit_itable(sb); 6870 ext4_register_li_request(sb, first_not_zeroed); 6871 } 6872 6873 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb)) 6874 ext4_stop_mmpd(sbi); 6875 6876 /* 6877 * Handle aborting the filesystem as the last thing during remount to 6878 * avoid obsure errors during remount when some option changes fail to 6879 * apply due to shutdown filesystem. 6880 */ 6881 if (test_opt2(sb, ABORT)) 6882 ext4_abort(sb, ESHUTDOWN, "Abort forced by user"); 6883 6884 return 0; 6885 6886 restore_opts: 6887 /* 6888 * If there was a failing r/w to ro transition, we may need to 6889 * re-enable quota 6890 */ 6891 if (sb_rdonly(sb) && !(old_sb_flags & SB_RDONLY) && 6892 sb_any_quota_suspended(sb)) 6893 dquot_resume(sb, -1); 6894 6895 alloc_ctx = ext4_writepages_down_write(sb); 6896 sb->s_flags = old_sb_flags; 6897 sbi->s_mount_opt = old_opts.s_mount_opt; 6898 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 6899 sbi->s_resuid = old_opts.s_resuid; 6900 sbi->s_resgid = old_opts.s_resgid; 6901 sbi->s_commit_interval = old_opts.s_commit_interval; 6902 sbi->s_min_batch_time = old_opts.s_min_batch_time; 6903 sbi->s_max_batch_time = old_opts.s_max_batch_time; 6904 ext4_writepages_up_write(sb, alloc_ctx); 6905 6906 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks) 6907 ext4_release_system_zone(sb); 6908 #ifdef CONFIG_QUOTA 6909 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 6910 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 6911 to_free[i] = get_qf_name(sb, sbi, i); 6912 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]); 6913 } 6914 synchronize_rcu(); 6915 for (i = 0; i < EXT4_MAXQUOTAS; i++) 6916 kfree(to_free[i]); 6917 #endif 6918 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb)) 6919 ext4_stop_mmpd(sbi); 6920 return err; 6921 } 6922 6923 static int ext4_reconfigure(struct fs_context *fc) 6924 { 6925 struct super_block *sb = fc->root->d_sb; 6926 int ret; 6927 bool old_ro = sb_rdonly(sb); 6928 6929 fc->s_fs_info = EXT4_SB(sb); 6930 6931 ret = ext4_check_opt_consistency(fc, sb); 6932 if (ret < 0) 6933 return ret; 6934 6935 ret = __ext4_remount(fc, sb); 6936 if (ret < 0) 6937 return ret; 6938 6939 ext4_msg(sb, KERN_INFO, "re-mounted %pU%s.", 6940 &sb->s_uuid, 6941 (old_ro != sb_rdonly(sb)) ? (sb_rdonly(sb) ? " ro" : " r/w") : ""); 6942 6943 return 0; 6944 } 6945 6946 #ifdef CONFIG_QUOTA 6947 static int ext4_statfs_project(struct super_block *sb, 6948 kprojid_t projid, struct kstatfs *buf) 6949 { 6950 struct kqid qid; 6951 struct dquot *dquot; 6952 u64 limit; 6953 u64 curblock; 6954 6955 qid = make_kqid_projid(projid); 6956 dquot = dqget(sb, qid); 6957 if (IS_ERR(dquot)) 6958 return PTR_ERR(dquot); 6959 spin_lock(&dquot->dq_dqb_lock); 6960 6961 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit, 6962 dquot->dq_dqb.dqb_bhardlimit); 6963 limit >>= sb->s_blocksize_bits; 6964 6965 if (limit) { 6966 uint64_t remaining = 0; 6967 6968 curblock = (dquot->dq_dqb.dqb_curspace + 6969 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits; 6970 if (limit > curblock) 6971 remaining = limit - curblock; 6972 6973 buf->f_blocks = min(buf->f_blocks, limit); 6974 buf->f_bfree = min(buf->f_bfree, remaining); 6975 buf->f_bavail = min(buf->f_bavail, remaining); 6976 } 6977 6978 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit, 6979 dquot->dq_dqb.dqb_ihardlimit); 6980 if (limit) { 6981 uint64_t remaining = 0; 6982 6983 if (limit > dquot->dq_dqb.dqb_curinodes) 6984 remaining = limit - dquot->dq_dqb.dqb_curinodes; 6985 6986 buf->f_files = min(buf->f_files, limit); 6987 buf->f_ffree = min(buf->f_ffree, remaining); 6988 } 6989 6990 spin_unlock(&dquot->dq_dqb_lock); 6991 dqput(dquot); 6992 return 0; 6993 } 6994 #endif 6995 6996 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 6997 { 6998 struct super_block *sb = dentry->d_sb; 6999 struct ext4_sb_info *sbi = EXT4_SB(sb); 7000 struct ext4_super_block *es = sbi->s_es; 7001 ext4_fsblk_t overhead = 0, resv_blocks; 7002 s64 bfree; 7003 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); 7004 7005 if (!test_opt(sb, MINIX_DF)) 7006 overhead = sbi->s_overhead; 7007 7008 buf->f_type = EXT4_SUPER_MAGIC; 7009 buf->f_bsize = sb->s_blocksize; 7010 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); 7011 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 7012 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 7013 /* prevent underflow in case that few free space is available */ 7014 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 7015 buf->f_bavail = buf->f_bfree - 7016 (ext4_r_blocks_count(es) + resv_blocks); 7017 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) 7018 buf->f_bavail = 0; 7019 buf->f_files = le32_to_cpu(es->s_inodes_count); 7020 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 7021 buf->f_namelen = EXT4_NAME_LEN; 7022 buf->f_fsid = uuid_to_fsid(es->s_uuid); 7023 7024 #ifdef CONFIG_QUOTA 7025 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) && 7026 sb_has_quota_limits_enabled(sb, PRJQUOTA)) 7027 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf); 7028 #endif 7029 return 0; 7030 } 7031 7032 7033 #ifdef CONFIG_QUOTA 7034 7035 /* 7036 * Helper functions so that transaction is started before we acquire dqio_sem 7037 * to keep correct lock ordering of transaction > dqio_sem 7038 */ 7039 static inline struct inode *dquot_to_inode(struct dquot *dquot) 7040 { 7041 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 7042 } 7043 7044 static int ext4_write_dquot(struct dquot *dquot) 7045 { 7046 int ret, err; 7047 handle_t *handle; 7048 struct inode *inode; 7049 7050 inode = dquot_to_inode(dquot); 7051 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 7052 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 7053 if (IS_ERR(handle)) 7054 return PTR_ERR(handle); 7055 ret = dquot_commit(dquot); 7056 if (ret < 0) 7057 ext4_error_err(dquot->dq_sb, -ret, 7058 "Failed to commit dquot type %d", 7059 dquot->dq_id.type); 7060 err = ext4_journal_stop(handle); 7061 if (!ret) 7062 ret = err; 7063 return ret; 7064 } 7065 7066 static int ext4_acquire_dquot(struct dquot *dquot) 7067 { 7068 int ret, err; 7069 handle_t *handle; 7070 7071 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 7072 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 7073 if (IS_ERR(handle)) 7074 return PTR_ERR(handle); 7075 ret = dquot_acquire(dquot); 7076 if (ret < 0) 7077 ext4_error_err(dquot->dq_sb, -ret, 7078 "Failed to acquire dquot type %d", 7079 dquot->dq_id.type); 7080 err = ext4_journal_stop(handle); 7081 if (!ret) 7082 ret = err; 7083 return ret; 7084 } 7085 7086 static int ext4_release_dquot(struct dquot *dquot) 7087 { 7088 int ret, err; 7089 handle_t *handle; 7090 bool freeze_protected = false; 7091 7092 /* 7093 * Trying to sb_start_intwrite() in a running transaction 7094 * can result in a deadlock. Further, running transactions 7095 * are already protected from freezing. 7096 */ 7097 if (!ext4_journal_current_handle()) { 7098 sb_start_intwrite(dquot->dq_sb); 7099 freeze_protected = true; 7100 } 7101 7102 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 7103 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 7104 if (IS_ERR(handle)) { 7105 /* Release dquot anyway to avoid endless cycle in dqput() */ 7106 dquot_release(dquot); 7107 if (freeze_protected) 7108 sb_end_intwrite(dquot->dq_sb); 7109 return PTR_ERR(handle); 7110 } 7111 ret = dquot_release(dquot); 7112 if (ret < 0) 7113 ext4_error_err(dquot->dq_sb, -ret, 7114 "Failed to release dquot type %d", 7115 dquot->dq_id.type); 7116 err = ext4_journal_stop(handle); 7117 if (!ret) 7118 ret = err; 7119 7120 if (freeze_protected) 7121 sb_end_intwrite(dquot->dq_sb); 7122 7123 return ret; 7124 } 7125 7126 static int ext4_mark_dquot_dirty(struct dquot *dquot) 7127 { 7128 struct super_block *sb = dquot->dq_sb; 7129 7130 if (ext4_is_quota_journalled(sb)) { 7131 dquot_mark_dquot_dirty(dquot); 7132 return ext4_write_dquot(dquot); 7133 } else { 7134 return dquot_mark_dquot_dirty(dquot); 7135 } 7136 } 7137 7138 static int ext4_write_info(struct super_block *sb, int type) 7139 { 7140 int ret, err; 7141 handle_t *handle; 7142 7143 /* Data block + inode block */ 7144 handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2); 7145 if (IS_ERR(handle)) 7146 return PTR_ERR(handle); 7147 ret = dquot_commit_info(sb, type); 7148 err = ext4_journal_stop(handle); 7149 if (!ret) 7150 ret = err; 7151 return ret; 7152 } 7153 7154 static void lockdep_set_quota_inode(struct inode *inode, int subclass) 7155 { 7156 struct ext4_inode_info *ei = EXT4_I(inode); 7157 7158 /* The first argument of lockdep_set_subclass has to be 7159 * *exactly* the same as the argument to init_rwsem() --- in 7160 * this case, in init_once() --- or lockdep gets unhappy 7161 * because the name of the lock is set using the 7162 * stringification of the argument to init_rwsem(). 7163 */ 7164 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ 7165 lockdep_set_subclass(&ei->i_data_sem, subclass); 7166 } 7167 7168 /* 7169 * Standard function to be called on quota_on 7170 */ 7171 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 7172 const struct path *path) 7173 { 7174 int err; 7175 7176 if (!test_opt(sb, QUOTA)) 7177 return -EINVAL; 7178 7179 /* Quotafile not on the same filesystem? */ 7180 if (path->dentry->d_sb != sb) 7181 return -EXDEV; 7182 7183 /* Quota already enabled for this file? */ 7184 if (IS_NOQUOTA(d_inode(path->dentry))) 7185 return -EBUSY; 7186 7187 /* Journaling quota? */ 7188 if (EXT4_SB(sb)->s_qf_names[type]) { 7189 /* Quotafile not in fs root? */ 7190 if (path->dentry->d_parent != sb->s_root) 7191 ext4_msg(sb, KERN_WARNING, 7192 "Quota file not on filesystem root. " 7193 "Journaled quota will not work"); 7194 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY; 7195 } else { 7196 /* 7197 * Clear the flag just in case mount options changed since 7198 * last time. 7199 */ 7200 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY; 7201 } 7202 7203 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA); 7204 err = dquot_quota_on(sb, type, format_id, path); 7205 if (!err) { 7206 struct inode *inode = d_inode(path->dentry); 7207 handle_t *handle; 7208 7209 /* 7210 * Set inode flags to prevent userspace from messing with quota 7211 * files. If this fails, we return success anyway since quotas 7212 * are already enabled and this is not a hard failure. 7213 */ 7214 inode_lock(inode); 7215 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 7216 if (IS_ERR(handle)) 7217 goto unlock_inode; 7218 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL; 7219 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 7220 S_NOATIME | S_IMMUTABLE); 7221 err = ext4_mark_inode_dirty(handle, inode); 7222 ext4_journal_stop(handle); 7223 unlock_inode: 7224 inode_unlock(inode); 7225 if (err) 7226 dquot_quota_off(sb, type); 7227 } 7228 if (err) 7229 lockdep_set_quota_inode(path->dentry->d_inode, 7230 I_DATA_SEM_NORMAL); 7231 return err; 7232 } 7233 7234 static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum) 7235 { 7236 switch (type) { 7237 case USRQUOTA: 7238 return qf_inum == EXT4_USR_QUOTA_INO; 7239 case GRPQUOTA: 7240 return qf_inum == EXT4_GRP_QUOTA_INO; 7241 case PRJQUOTA: 7242 return qf_inum >= EXT4_GOOD_OLD_FIRST_INO; 7243 default: 7244 BUG(); 7245 } 7246 } 7247 7248 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 7249 unsigned int flags) 7250 { 7251 int err; 7252 struct inode *qf_inode; 7253 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 7254 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 7255 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 7256 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 7257 }; 7258 7259 BUG_ON(!ext4_has_feature_quota(sb)); 7260 7261 if (!qf_inums[type]) 7262 return -EPERM; 7263 7264 if (!ext4_check_quota_inum(type, qf_inums[type])) { 7265 ext4_error(sb, "Bad quota inum: %lu, type: %d", 7266 qf_inums[type], type); 7267 return -EUCLEAN; 7268 } 7269 7270 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL); 7271 if (IS_ERR(qf_inode)) { 7272 ext4_error(sb, "Bad quota inode: %lu, type: %d", 7273 qf_inums[type], type); 7274 return PTR_ERR(qf_inode); 7275 } 7276 7277 /* Don't account quota for quota files to avoid recursion */ 7278 qf_inode->i_flags |= S_NOQUOTA; 7279 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); 7280 err = dquot_load_quota_inode(qf_inode, type, format_id, flags); 7281 if (err) 7282 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); 7283 iput(qf_inode); 7284 7285 return err; 7286 } 7287 7288 /* Enable usage tracking for all quota types. */ 7289 int ext4_enable_quotas(struct super_block *sb) 7290 { 7291 int type, err = 0; 7292 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 7293 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 7294 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 7295 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 7296 }; 7297 bool quota_mopt[EXT4_MAXQUOTAS] = { 7298 test_opt(sb, USRQUOTA), 7299 test_opt(sb, GRPQUOTA), 7300 test_opt(sb, PRJQUOTA), 7301 }; 7302 7303 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY; 7304 for (type = 0; type < EXT4_MAXQUOTAS; type++) { 7305 if (qf_inums[type]) { 7306 err = ext4_quota_enable(sb, type, QFMT_VFS_V1, 7307 DQUOT_USAGE_ENABLED | 7308 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0)); 7309 if (err) { 7310 ext4_warning(sb, 7311 "Failed to enable quota tracking " 7312 "(type=%d, err=%d, ino=%lu). " 7313 "Please run e2fsck to fix.", type, 7314 err, qf_inums[type]); 7315 7316 ext4_quotas_off(sb, type); 7317 return err; 7318 } 7319 } 7320 } 7321 return 0; 7322 } 7323 7324 static int ext4_quota_off(struct super_block *sb, int type) 7325 { 7326 struct inode *inode = sb_dqopt(sb)->files[type]; 7327 handle_t *handle; 7328 int err; 7329 7330 /* Force all delayed allocation blocks to be allocated. 7331 * Caller already holds s_umount sem */ 7332 if (test_opt(sb, DELALLOC)) 7333 sync_filesystem(sb); 7334 7335 if (!inode || !igrab(inode)) 7336 goto out; 7337 7338 err = dquot_quota_off(sb, type); 7339 if (err || ext4_has_feature_quota(sb)) 7340 goto out_put; 7341 /* 7342 * When the filesystem was remounted read-only first, we cannot cleanup 7343 * inode flags here. Bad luck but people should be using QUOTA feature 7344 * these days anyway. 7345 */ 7346 if (sb_rdonly(sb)) 7347 goto out_put; 7348 7349 inode_lock(inode); 7350 /* 7351 * Update modification times of quota files when userspace can 7352 * start looking at them. If we fail, we return success anyway since 7353 * this is not a hard failure and quotas are already disabled. 7354 */ 7355 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 7356 if (IS_ERR(handle)) { 7357 err = PTR_ERR(handle); 7358 goto out_unlock; 7359 } 7360 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL); 7361 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 7362 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); 7363 err = ext4_mark_inode_dirty(handle, inode); 7364 ext4_journal_stop(handle); 7365 out_unlock: 7366 inode_unlock(inode); 7367 out_put: 7368 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL); 7369 iput(inode); 7370 return err; 7371 out: 7372 return dquot_quota_off(sb, type); 7373 } 7374 7375 /* Read data from quotafile - avoid pagecache and such because we cannot afford 7376 * acquiring the locks... As quota files are never truncated and quota code 7377 * itself serializes the operations (and no one else should touch the files) 7378 * we don't have to be afraid of races */ 7379 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 7380 size_t len, loff_t off) 7381 { 7382 struct inode *inode = sb_dqopt(sb)->files[type]; 7383 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 7384 int offset = off & (sb->s_blocksize - 1); 7385 int tocopy; 7386 size_t toread; 7387 struct buffer_head *bh; 7388 loff_t i_size = i_size_read(inode); 7389 7390 if (off > i_size) 7391 return 0; 7392 if (off+len > i_size) 7393 len = i_size-off; 7394 toread = len; 7395 while (toread > 0) { 7396 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread); 7397 bh = ext4_bread(NULL, inode, blk, 0); 7398 if (IS_ERR(bh)) 7399 return PTR_ERR(bh); 7400 if (!bh) /* A hole? */ 7401 memset(data, 0, tocopy); 7402 else 7403 memcpy(data, bh->b_data+offset, tocopy); 7404 brelse(bh); 7405 offset = 0; 7406 toread -= tocopy; 7407 data += tocopy; 7408 blk++; 7409 } 7410 return len; 7411 } 7412 7413 /* Write to quotafile (we know the transaction is already started and has 7414 * enough credits) */ 7415 static ssize_t ext4_quota_write(struct super_block *sb, int type, 7416 const char *data, size_t len, loff_t off) 7417 { 7418 struct inode *inode = sb_dqopt(sb)->files[type]; 7419 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 7420 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1); 7421 int retries = 0; 7422 struct buffer_head *bh; 7423 handle_t *handle = journal_current_handle(); 7424 7425 if (!handle) { 7426 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 7427 " cancelled because transaction is not started", 7428 (unsigned long long)off, (unsigned long long)len); 7429 return -EIO; 7430 } 7431 /* 7432 * Since we account only one data block in transaction credits, 7433 * then it is impossible to cross a block boundary. 7434 */ 7435 if (sb->s_blocksize - offset < len) { 7436 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 7437 " cancelled because not block aligned", 7438 (unsigned long long)off, (unsigned long long)len); 7439 return -EIO; 7440 } 7441 7442 do { 7443 bh = ext4_bread(handle, inode, blk, 7444 EXT4_GET_BLOCKS_CREATE | 7445 EXT4_GET_BLOCKS_METADATA_NOFAIL); 7446 } while (PTR_ERR(bh) == -ENOSPC && 7447 ext4_should_retry_alloc(inode->i_sb, &retries)); 7448 if (IS_ERR(bh)) 7449 return PTR_ERR(bh); 7450 if (!bh) 7451 goto out; 7452 BUFFER_TRACE(bh, "get write access"); 7453 err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); 7454 if (err) { 7455 brelse(bh); 7456 return err; 7457 } 7458 lock_buffer(bh); 7459 memcpy(bh->b_data+offset, data, len); 7460 flush_dcache_folio(bh->b_folio); 7461 unlock_buffer(bh); 7462 err = ext4_handle_dirty_metadata(handle, NULL, bh); 7463 brelse(bh); 7464 out: 7465 if (inode->i_size < off + len) { 7466 i_size_write(inode, off + len); 7467 EXT4_I(inode)->i_disksize = inode->i_size; 7468 err2 = ext4_mark_inode_dirty(handle, inode); 7469 if (unlikely(err2 && !err)) 7470 err = err2; 7471 } 7472 return err ? err : len; 7473 } 7474 #endif 7475 7476 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 7477 static inline void register_as_ext2(void) 7478 { 7479 int err = register_filesystem(&ext2_fs_type); 7480 if (err) 7481 printk(KERN_WARNING 7482 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 7483 } 7484 7485 static inline void unregister_as_ext2(void) 7486 { 7487 unregister_filesystem(&ext2_fs_type); 7488 } 7489 7490 static inline int ext2_feature_set_ok(struct super_block *sb) 7491 { 7492 if (ext4_has_unknown_ext2_incompat_features(sb)) 7493 return 0; 7494 if (sb_rdonly(sb)) 7495 return 1; 7496 if (ext4_has_unknown_ext2_ro_compat_features(sb)) 7497 return 0; 7498 return 1; 7499 } 7500 #else 7501 static inline void register_as_ext2(void) { } 7502 static inline void unregister_as_ext2(void) { } 7503 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 7504 #endif 7505 7506 static inline void register_as_ext3(void) 7507 { 7508 int err = register_filesystem(&ext3_fs_type); 7509 if (err) 7510 printk(KERN_WARNING 7511 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 7512 } 7513 7514 static inline void unregister_as_ext3(void) 7515 { 7516 unregister_filesystem(&ext3_fs_type); 7517 } 7518 7519 static inline int ext3_feature_set_ok(struct super_block *sb) 7520 { 7521 if (ext4_has_unknown_ext3_incompat_features(sb)) 7522 return 0; 7523 if (!ext4_has_feature_journal(sb)) 7524 return 0; 7525 if (sb_rdonly(sb)) 7526 return 1; 7527 if (ext4_has_unknown_ext3_ro_compat_features(sb)) 7528 return 0; 7529 return 1; 7530 } 7531 7532 static void ext4_kill_sb(struct super_block *sb) 7533 { 7534 struct ext4_sb_info *sbi = EXT4_SB(sb); 7535 struct file *bdev_file = sbi ? sbi->s_journal_bdev_file : NULL; 7536 7537 kill_block_super(sb); 7538 7539 if (bdev_file) 7540 fs_bdev_file_release(bdev_file, sb); 7541 } 7542 7543 static struct file_system_type ext4_fs_type = { 7544 .owner = THIS_MODULE, 7545 .name = "ext4", 7546 .init_fs_context = ext4_init_fs_context, 7547 .parameters = ext4_param_specs, 7548 .kill_sb = ext4_kill_sb, 7549 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME | 7550 FS_LBS, 7551 }; 7552 MODULE_ALIAS_FS("ext4"); 7553 7554 static int __init ext4_init_fs(void) 7555 { 7556 int err; 7557 7558 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); 7559 ext4_li_info = NULL; 7560 7561 /* Build-time check for flags consistency */ 7562 ext4_check_flag_values(); 7563 7564 err = ext4_init_es(); 7565 if (err) 7566 return err; 7567 7568 err = ext4_init_pending(); 7569 if (err) 7570 goto out7; 7571 7572 err = ext4_init_verity_caches(); 7573 if (err) 7574 goto out6; 7575 7576 err = ext4_init_pageio(); 7577 if (err) 7578 goto out5; 7579 7580 err = ext4_init_system_zone(); 7581 if (err) 7582 goto out4; 7583 7584 err = ext4_init_sysfs(); 7585 if (err) 7586 goto out3; 7587 7588 err = ext4_init_mballoc(); 7589 if (err) 7590 goto out2; 7591 err = init_inodecache(); 7592 if (err) 7593 goto out1; 7594 7595 err = ext4_fc_init_dentry_cache(); 7596 if (err) 7597 goto out05; 7598 7599 register_as_ext3(); 7600 register_as_ext2(); 7601 err = register_filesystem(&ext4_fs_type); 7602 if (err) 7603 goto out; 7604 7605 return 0; 7606 out: 7607 unregister_as_ext2(); 7608 unregister_as_ext3(); 7609 ext4_fc_destroy_dentry_cache(); 7610 out05: 7611 destroy_inodecache(); 7612 out1: 7613 ext4_exit_mballoc(); 7614 out2: 7615 ext4_exit_sysfs(); 7616 out3: 7617 ext4_exit_system_zone(); 7618 out4: 7619 ext4_exit_pageio(); 7620 out5: 7621 ext4_exit_verity_caches(); 7622 out6: 7623 ext4_exit_pending(); 7624 out7: 7625 ext4_exit_es(); 7626 7627 return err; 7628 } 7629 7630 static void __exit ext4_exit_fs(void) 7631 { 7632 ext4_destroy_lazyinit_thread(); 7633 unregister_as_ext2(); 7634 unregister_as_ext3(); 7635 unregister_filesystem(&ext4_fs_type); 7636 ext4_fc_destroy_dentry_cache(); 7637 destroy_inodecache(); 7638 ext4_exit_mballoc(); 7639 ext4_exit_sysfs(); 7640 ext4_exit_system_zone(); 7641 ext4_exit_pageio(); 7642 ext4_exit_verity_caches(); 7643 ext4_exit_es(); 7644 ext4_exit_pending(); 7645 } 7646 7647 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 7648 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 7649 MODULE_LICENSE("GPL"); 7650 module_init(ext4_init_fs) 7651 module_exit(ext4_exit_fs) 7652