1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/vmalloc.h> 24 #include <linux/slab.h> 25 #include <linux/init.h> 26 #include <linux/blkdev.h> 27 #include <linux/backing-dev.h> 28 #include <linux/parser.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <linux/vfs.h> 32 #include <linux/random.h> 33 #include <linux/mount.h> 34 #include <linux/namei.h> 35 #include <linux/quotaops.h> 36 #include <linux/seq_file.h> 37 #include <linux/ctype.h> 38 #include <linux/log2.h> 39 #include <linux/crc16.h> 40 #include <linux/cleancache.h> 41 #include <linux/uaccess.h> 42 43 #include <linux/kthread.h> 44 #include <linux/freezer.h> 45 46 #include "ext4.h" 47 #include "ext4_extents.h" /* Needed for trace points definition */ 48 #include "ext4_jbd2.h" 49 #include "xattr.h" 50 #include "acl.h" 51 #include "mballoc.h" 52 53 #define CREATE_TRACE_POINTS 54 #include <trace/events/ext4.h> 55 56 static struct ext4_lazy_init *ext4_li_info; 57 static struct mutex ext4_li_mtx; 58 static struct ratelimit_state ext4_mount_msg_ratelimit; 59 60 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 61 unsigned long journal_devnum); 62 static int ext4_show_options(struct seq_file *seq, struct dentry *root); 63 static int ext4_commit_super(struct super_block *sb, int sync); 64 static void ext4_mark_recovery_complete(struct super_block *sb, 65 struct ext4_super_block *es); 66 static void ext4_clear_journal_err(struct super_block *sb, 67 struct ext4_super_block *es); 68 static int ext4_sync_fs(struct super_block *sb, int wait); 69 static int ext4_remount(struct super_block *sb, int *flags, char *data); 70 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 71 static int ext4_unfreeze(struct super_block *sb); 72 static int ext4_freeze(struct super_block *sb); 73 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 74 const char *dev_name, void *data); 75 static inline int ext2_feature_set_ok(struct super_block *sb); 76 static inline int ext3_feature_set_ok(struct super_block *sb); 77 static int ext4_feature_set_ok(struct super_block *sb, int readonly); 78 static void ext4_destroy_lazyinit_thread(void); 79 static void ext4_unregister_li_request(struct super_block *sb); 80 static void ext4_clear_request_list(void); 81 static struct inode *ext4_get_journal_inode(struct super_block *sb, 82 unsigned int journal_inum); 83 84 /* 85 * Lock ordering 86 * 87 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and 88 * i_mmap_rwsem (inode->i_mmap_rwsem)! 89 * 90 * page fault path: 91 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start -> 92 * page lock -> i_data_sem (rw) 93 * 94 * buffered write path: 95 * sb_start_write -> i_mutex -> mmap_sem 96 * sb_start_write -> i_mutex -> transaction start -> page lock -> 97 * i_data_sem (rw) 98 * 99 * truncate: 100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> 101 * i_mmap_rwsem (w) -> page lock 102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> 103 * transaction start -> i_data_sem (rw) 104 * 105 * direct IO: 106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem 107 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> 108 * transaction start -> i_data_sem (rw) 109 * 110 * writepages: 111 * transaction start -> page lock(s) -> i_data_sem (rw) 112 */ 113 114 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 115 static struct file_system_type ext2_fs_type = { 116 .owner = THIS_MODULE, 117 .name = "ext2", 118 .mount = ext4_mount, 119 .kill_sb = kill_block_super, 120 .fs_flags = FS_REQUIRES_DEV, 121 }; 122 MODULE_ALIAS_FS("ext2"); 123 MODULE_ALIAS("ext2"); 124 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 125 #else 126 #define IS_EXT2_SB(sb) (0) 127 #endif 128 129 130 static struct file_system_type ext3_fs_type = { 131 .owner = THIS_MODULE, 132 .name = "ext3", 133 .mount = ext4_mount, 134 .kill_sb = kill_block_super, 135 .fs_flags = FS_REQUIRES_DEV, 136 }; 137 MODULE_ALIAS_FS("ext3"); 138 MODULE_ALIAS("ext3"); 139 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 140 141 static int ext4_verify_csum_type(struct super_block *sb, 142 struct ext4_super_block *es) 143 { 144 if (!ext4_has_feature_metadata_csum(sb)) 145 return 1; 146 147 return es->s_checksum_type == EXT4_CRC32C_CHKSUM; 148 } 149 150 static __le32 ext4_superblock_csum(struct super_block *sb, 151 struct ext4_super_block *es) 152 { 153 struct ext4_sb_info *sbi = EXT4_SB(sb); 154 int offset = offsetof(struct ext4_super_block, s_checksum); 155 __u32 csum; 156 157 csum = ext4_chksum(sbi, ~0, (char *)es, offset); 158 159 return cpu_to_le32(csum); 160 } 161 162 static int ext4_superblock_csum_verify(struct super_block *sb, 163 struct ext4_super_block *es) 164 { 165 if (!ext4_has_metadata_csum(sb)) 166 return 1; 167 168 return es->s_checksum == ext4_superblock_csum(sb, es); 169 } 170 171 void ext4_superblock_csum_set(struct super_block *sb) 172 { 173 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 174 175 if (!ext4_has_metadata_csum(sb)) 176 return; 177 178 es->s_checksum = ext4_superblock_csum(sb, es); 179 } 180 181 void *ext4_kvmalloc(size_t size, gfp_t flags) 182 { 183 void *ret; 184 185 ret = kmalloc(size, flags | __GFP_NOWARN); 186 if (!ret) 187 ret = __vmalloc(size, flags, PAGE_KERNEL); 188 return ret; 189 } 190 191 void *ext4_kvzalloc(size_t size, gfp_t flags) 192 { 193 void *ret; 194 195 ret = kzalloc(size, flags | __GFP_NOWARN); 196 if (!ret) 197 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 198 return ret; 199 } 200 201 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 202 struct ext4_group_desc *bg) 203 { 204 return le32_to_cpu(bg->bg_block_bitmap_lo) | 205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 206 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 207 } 208 209 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 210 struct ext4_group_desc *bg) 211 { 212 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 214 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 215 } 216 217 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 218 struct ext4_group_desc *bg) 219 { 220 return le32_to_cpu(bg->bg_inode_table_lo) | 221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 222 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 223 } 224 225 __u32 ext4_free_group_clusters(struct super_block *sb, 226 struct ext4_group_desc *bg) 227 { 228 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 230 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 231 } 232 233 __u32 ext4_free_inodes_count(struct super_block *sb, 234 struct ext4_group_desc *bg) 235 { 236 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 238 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 239 } 240 241 __u32 ext4_used_dirs_count(struct super_block *sb, 242 struct ext4_group_desc *bg) 243 { 244 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 245 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 246 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 247 } 248 249 __u32 ext4_itable_unused_count(struct super_block *sb, 250 struct ext4_group_desc *bg) 251 { 252 return le16_to_cpu(bg->bg_itable_unused_lo) | 253 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 254 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 255 } 256 257 void ext4_block_bitmap_set(struct super_block *sb, 258 struct ext4_group_desc *bg, ext4_fsblk_t blk) 259 { 260 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 262 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 263 } 264 265 void ext4_inode_bitmap_set(struct super_block *sb, 266 struct ext4_group_desc *bg, ext4_fsblk_t blk) 267 { 268 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 270 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 271 } 272 273 void ext4_inode_table_set(struct super_block *sb, 274 struct ext4_group_desc *bg, ext4_fsblk_t blk) 275 { 276 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 278 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 279 } 280 281 void ext4_free_group_clusters_set(struct super_block *sb, 282 struct ext4_group_desc *bg, __u32 count) 283 { 284 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 286 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 287 } 288 289 void ext4_free_inodes_set(struct super_block *sb, 290 struct ext4_group_desc *bg, __u32 count) 291 { 292 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 294 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 295 } 296 297 void ext4_used_dirs_set(struct super_block *sb, 298 struct ext4_group_desc *bg, __u32 count) 299 { 300 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 301 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 302 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 303 } 304 305 void ext4_itable_unused_set(struct super_block *sb, 306 struct ext4_group_desc *bg, __u32 count) 307 { 308 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 309 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 310 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 311 } 312 313 314 static void __save_error_info(struct super_block *sb, const char *func, 315 unsigned int line) 316 { 317 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 318 319 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 320 if (bdev_read_only(sb->s_bdev)) 321 return; 322 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 323 es->s_last_error_time = cpu_to_le32(get_seconds()); 324 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 325 es->s_last_error_line = cpu_to_le32(line); 326 if (!es->s_first_error_time) { 327 es->s_first_error_time = es->s_last_error_time; 328 strncpy(es->s_first_error_func, func, 329 sizeof(es->s_first_error_func)); 330 es->s_first_error_line = cpu_to_le32(line); 331 es->s_first_error_ino = es->s_last_error_ino; 332 es->s_first_error_block = es->s_last_error_block; 333 } 334 /* 335 * Start the daily error reporting function if it hasn't been 336 * started already 337 */ 338 if (!es->s_error_count) 339 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 340 le32_add_cpu(&es->s_error_count, 1); 341 } 342 343 static void save_error_info(struct super_block *sb, const char *func, 344 unsigned int line) 345 { 346 __save_error_info(sb, func, line); 347 ext4_commit_super(sb, 1); 348 } 349 350 /* 351 * The del_gendisk() function uninitializes the disk-specific data 352 * structures, including the bdi structure, without telling anyone 353 * else. Once this happens, any attempt to call mark_buffer_dirty() 354 * (for example, by ext4_commit_super), will cause a kernel OOPS. 355 * This is a kludge to prevent these oops until we can put in a proper 356 * hook in del_gendisk() to inform the VFS and file system layers. 357 */ 358 static int block_device_ejected(struct super_block *sb) 359 { 360 struct inode *bd_inode = sb->s_bdev->bd_inode; 361 struct backing_dev_info *bdi = inode_to_bdi(bd_inode); 362 363 return bdi->dev == NULL; 364 } 365 366 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 367 { 368 struct super_block *sb = journal->j_private; 369 struct ext4_sb_info *sbi = EXT4_SB(sb); 370 int error = is_journal_aborted(journal); 371 struct ext4_journal_cb_entry *jce; 372 373 BUG_ON(txn->t_state == T_FINISHED); 374 spin_lock(&sbi->s_md_lock); 375 while (!list_empty(&txn->t_private_list)) { 376 jce = list_entry(txn->t_private_list.next, 377 struct ext4_journal_cb_entry, jce_list); 378 list_del_init(&jce->jce_list); 379 spin_unlock(&sbi->s_md_lock); 380 jce->jce_func(sb, jce, error); 381 spin_lock(&sbi->s_md_lock); 382 } 383 spin_unlock(&sbi->s_md_lock); 384 } 385 386 /* Deal with the reporting of failure conditions on a filesystem such as 387 * inconsistencies detected or read IO failures. 388 * 389 * On ext2, we can store the error state of the filesystem in the 390 * superblock. That is not possible on ext4, because we may have other 391 * write ordering constraints on the superblock which prevent us from 392 * writing it out straight away; and given that the journal is about to 393 * be aborted, we can't rely on the current, or future, transactions to 394 * write out the superblock safely. 395 * 396 * We'll just use the jbd2_journal_abort() error code to record an error in 397 * the journal instead. On recovery, the journal will complain about 398 * that error until we've noted it down and cleared it. 399 */ 400 401 static void ext4_handle_error(struct super_block *sb) 402 { 403 if (sb->s_flags & MS_RDONLY) 404 return; 405 406 if (!test_opt(sb, ERRORS_CONT)) { 407 journal_t *journal = EXT4_SB(sb)->s_journal; 408 409 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 410 if (journal) 411 jbd2_journal_abort(journal, -EIO); 412 } 413 if (test_opt(sb, ERRORS_RO)) { 414 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 415 /* 416 * Make sure updated value of ->s_mount_flags will be visible 417 * before ->s_flags update 418 */ 419 smp_wmb(); 420 sb->s_flags |= MS_RDONLY; 421 } 422 if (test_opt(sb, ERRORS_PANIC)) { 423 if (EXT4_SB(sb)->s_journal && 424 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) 425 return; 426 panic("EXT4-fs (device %s): panic forced after error\n", 427 sb->s_id); 428 } 429 } 430 431 #define ext4_error_ratelimit(sb) \ 432 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ 433 "EXT4-fs error") 434 435 void __ext4_error(struct super_block *sb, const char *function, 436 unsigned int line, const char *fmt, ...) 437 { 438 struct va_format vaf; 439 va_list args; 440 441 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 442 return; 443 444 if (ext4_error_ratelimit(sb)) { 445 va_start(args, fmt); 446 vaf.fmt = fmt; 447 vaf.va = &args; 448 printk(KERN_CRIT 449 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 450 sb->s_id, function, line, current->comm, &vaf); 451 va_end(args); 452 } 453 save_error_info(sb, function, line); 454 ext4_handle_error(sb); 455 } 456 457 void __ext4_error_inode(struct inode *inode, const char *function, 458 unsigned int line, ext4_fsblk_t block, 459 const char *fmt, ...) 460 { 461 va_list args; 462 struct va_format vaf; 463 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 464 465 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 466 return; 467 468 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 469 es->s_last_error_block = cpu_to_le64(block); 470 if (ext4_error_ratelimit(inode->i_sb)) { 471 va_start(args, fmt); 472 vaf.fmt = fmt; 473 vaf.va = &args; 474 if (block) 475 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 476 "inode #%lu: block %llu: comm %s: %pV\n", 477 inode->i_sb->s_id, function, line, inode->i_ino, 478 block, current->comm, &vaf); 479 else 480 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 481 "inode #%lu: comm %s: %pV\n", 482 inode->i_sb->s_id, function, line, inode->i_ino, 483 current->comm, &vaf); 484 va_end(args); 485 } 486 save_error_info(inode->i_sb, function, line); 487 ext4_handle_error(inode->i_sb); 488 } 489 490 void __ext4_error_file(struct file *file, const char *function, 491 unsigned int line, ext4_fsblk_t block, 492 const char *fmt, ...) 493 { 494 va_list args; 495 struct va_format vaf; 496 struct ext4_super_block *es; 497 struct inode *inode = file_inode(file); 498 char pathname[80], *path; 499 500 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 501 return; 502 503 es = EXT4_SB(inode->i_sb)->s_es; 504 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 505 if (ext4_error_ratelimit(inode->i_sb)) { 506 path = file_path(file, pathname, sizeof(pathname)); 507 if (IS_ERR(path)) 508 path = "(unknown)"; 509 va_start(args, fmt); 510 vaf.fmt = fmt; 511 vaf.va = &args; 512 if (block) 513 printk(KERN_CRIT 514 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 515 "block %llu: comm %s: path %s: %pV\n", 516 inode->i_sb->s_id, function, line, inode->i_ino, 517 block, current->comm, path, &vaf); 518 else 519 printk(KERN_CRIT 520 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 521 "comm %s: path %s: %pV\n", 522 inode->i_sb->s_id, function, line, inode->i_ino, 523 current->comm, path, &vaf); 524 va_end(args); 525 } 526 save_error_info(inode->i_sb, function, line); 527 ext4_handle_error(inode->i_sb); 528 } 529 530 const char *ext4_decode_error(struct super_block *sb, int errno, 531 char nbuf[16]) 532 { 533 char *errstr = NULL; 534 535 switch (errno) { 536 case -EFSCORRUPTED: 537 errstr = "Corrupt filesystem"; 538 break; 539 case -EFSBADCRC: 540 errstr = "Filesystem failed CRC"; 541 break; 542 case -EIO: 543 errstr = "IO failure"; 544 break; 545 case -ENOMEM: 546 errstr = "Out of memory"; 547 break; 548 case -EROFS: 549 if (!sb || (EXT4_SB(sb)->s_journal && 550 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 551 errstr = "Journal has aborted"; 552 else 553 errstr = "Readonly filesystem"; 554 break; 555 default: 556 /* If the caller passed in an extra buffer for unknown 557 * errors, textualise them now. Else we just return 558 * NULL. */ 559 if (nbuf) { 560 /* Check for truncated error codes... */ 561 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 562 errstr = nbuf; 563 } 564 break; 565 } 566 567 return errstr; 568 } 569 570 /* __ext4_std_error decodes expected errors from journaling functions 571 * automatically and invokes the appropriate error response. */ 572 573 void __ext4_std_error(struct super_block *sb, const char *function, 574 unsigned int line, int errno) 575 { 576 char nbuf[16]; 577 const char *errstr; 578 579 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 580 return; 581 582 /* Special case: if the error is EROFS, and we're not already 583 * inside a transaction, then there's really no point in logging 584 * an error. */ 585 if (errno == -EROFS && journal_current_handle() == NULL && 586 (sb->s_flags & MS_RDONLY)) 587 return; 588 589 if (ext4_error_ratelimit(sb)) { 590 errstr = ext4_decode_error(sb, errno, nbuf); 591 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 592 sb->s_id, function, line, errstr); 593 } 594 595 save_error_info(sb, function, line); 596 ext4_handle_error(sb); 597 } 598 599 /* 600 * ext4_abort is a much stronger failure handler than ext4_error. The 601 * abort function may be used to deal with unrecoverable failures such 602 * as journal IO errors or ENOMEM at a critical moment in log management. 603 * 604 * We unconditionally force the filesystem into an ABORT|READONLY state, 605 * unless the error response on the fs has been set to panic in which 606 * case we take the easy way out and panic immediately. 607 */ 608 609 void __ext4_abort(struct super_block *sb, const char *function, 610 unsigned int line, const char *fmt, ...) 611 { 612 struct va_format vaf; 613 va_list args; 614 615 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 616 return; 617 618 save_error_info(sb, function, line); 619 va_start(args, fmt); 620 vaf.fmt = fmt; 621 vaf.va = &args; 622 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n", 623 sb->s_id, function, line, &vaf); 624 va_end(args); 625 626 if ((sb->s_flags & MS_RDONLY) == 0) { 627 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 628 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 629 /* 630 * Make sure updated value of ->s_mount_flags will be visible 631 * before ->s_flags update 632 */ 633 smp_wmb(); 634 sb->s_flags |= MS_RDONLY; 635 if (EXT4_SB(sb)->s_journal) 636 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 637 save_error_info(sb, function, line); 638 } 639 if (test_opt(sb, ERRORS_PANIC)) { 640 if (EXT4_SB(sb)->s_journal && 641 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) 642 return; 643 panic("EXT4-fs panic from previous error\n"); 644 } 645 } 646 647 void __ext4_msg(struct super_block *sb, 648 const char *prefix, const char *fmt, ...) 649 { 650 struct va_format vaf; 651 va_list args; 652 653 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs")) 654 return; 655 656 va_start(args, fmt); 657 vaf.fmt = fmt; 658 vaf.va = &args; 659 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 660 va_end(args); 661 } 662 663 #define ext4_warning_ratelimit(sb) \ 664 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \ 665 "EXT4-fs warning") 666 667 void __ext4_warning(struct super_block *sb, const char *function, 668 unsigned int line, const char *fmt, ...) 669 { 670 struct va_format vaf; 671 va_list args; 672 673 if (!ext4_warning_ratelimit(sb)) 674 return; 675 676 va_start(args, fmt); 677 vaf.fmt = fmt; 678 vaf.va = &args; 679 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 680 sb->s_id, function, line, &vaf); 681 va_end(args); 682 } 683 684 void __ext4_warning_inode(const struct inode *inode, const char *function, 685 unsigned int line, const char *fmt, ...) 686 { 687 struct va_format vaf; 688 va_list args; 689 690 if (!ext4_warning_ratelimit(inode->i_sb)) 691 return; 692 693 va_start(args, fmt); 694 vaf.fmt = fmt; 695 vaf.va = &args; 696 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " 697 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id, 698 function, line, inode->i_ino, current->comm, &vaf); 699 va_end(args); 700 } 701 702 void __ext4_grp_locked_error(const char *function, unsigned int line, 703 struct super_block *sb, ext4_group_t grp, 704 unsigned long ino, ext4_fsblk_t block, 705 const char *fmt, ...) 706 __releases(bitlock) 707 __acquires(bitlock) 708 { 709 struct va_format vaf; 710 va_list args; 711 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 712 713 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 714 return; 715 716 es->s_last_error_ino = cpu_to_le32(ino); 717 es->s_last_error_block = cpu_to_le64(block); 718 __save_error_info(sb, function, line); 719 720 if (ext4_error_ratelimit(sb)) { 721 va_start(args, fmt); 722 vaf.fmt = fmt; 723 vaf.va = &args; 724 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 725 sb->s_id, function, line, grp); 726 if (ino) 727 printk(KERN_CONT "inode %lu: ", ino); 728 if (block) 729 printk(KERN_CONT "block %llu:", 730 (unsigned long long) block); 731 printk(KERN_CONT "%pV\n", &vaf); 732 va_end(args); 733 } 734 735 if (test_opt(sb, ERRORS_CONT)) { 736 ext4_commit_super(sb, 0); 737 return; 738 } 739 740 ext4_unlock_group(sb, grp); 741 ext4_handle_error(sb); 742 /* 743 * We only get here in the ERRORS_RO case; relocking the group 744 * may be dangerous, but nothing bad will happen since the 745 * filesystem will have already been marked read/only and the 746 * journal has been aborted. We return 1 as a hint to callers 747 * who might what to use the return value from 748 * ext4_grp_locked_error() to distinguish between the 749 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 750 * aggressively from the ext4 function in question, with a 751 * more appropriate error code. 752 */ 753 ext4_lock_group(sb, grp); 754 return; 755 } 756 757 void ext4_update_dynamic_rev(struct super_block *sb) 758 { 759 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 760 761 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 762 return; 763 764 ext4_warning(sb, 765 "updating to rev %d because of new feature flag, " 766 "running e2fsck is recommended", 767 EXT4_DYNAMIC_REV); 768 769 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 770 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 771 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 772 /* leave es->s_feature_*compat flags alone */ 773 /* es->s_uuid will be set by e2fsck if empty */ 774 775 /* 776 * The rest of the superblock fields should be zero, and if not it 777 * means they are likely already in use, so leave them alone. We 778 * can leave it up to e2fsck to clean up any inconsistencies there. 779 */ 780 } 781 782 /* 783 * Open the external journal device 784 */ 785 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 786 { 787 struct block_device *bdev; 788 char b[BDEVNAME_SIZE]; 789 790 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 791 if (IS_ERR(bdev)) 792 goto fail; 793 return bdev; 794 795 fail: 796 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 797 __bdevname(dev, b), PTR_ERR(bdev)); 798 return NULL; 799 } 800 801 /* 802 * Release the journal device 803 */ 804 static void ext4_blkdev_put(struct block_device *bdev) 805 { 806 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 807 } 808 809 static void ext4_blkdev_remove(struct ext4_sb_info *sbi) 810 { 811 struct block_device *bdev; 812 bdev = sbi->journal_bdev; 813 if (bdev) { 814 ext4_blkdev_put(bdev); 815 sbi->journal_bdev = NULL; 816 } 817 } 818 819 static inline struct inode *orphan_list_entry(struct list_head *l) 820 { 821 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 822 } 823 824 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 825 { 826 struct list_head *l; 827 828 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 829 le32_to_cpu(sbi->s_es->s_last_orphan)); 830 831 printk(KERN_ERR "sb_info orphan list:\n"); 832 list_for_each(l, &sbi->s_orphan) { 833 struct inode *inode = orphan_list_entry(l); 834 printk(KERN_ERR " " 835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 836 inode->i_sb->s_id, inode->i_ino, inode, 837 inode->i_mode, inode->i_nlink, 838 NEXT_ORPHAN(inode)); 839 } 840 } 841 842 #ifdef CONFIG_QUOTA 843 static int ext4_quota_off(struct super_block *sb, int type); 844 845 static inline void ext4_quota_off_umount(struct super_block *sb) 846 { 847 int type; 848 849 if (ext4_has_feature_quota(sb)) { 850 dquot_disable(sb, -1, 851 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 852 } else { 853 /* Use our quota_off function to clear inode flags etc. */ 854 for (type = 0; type < EXT4_MAXQUOTAS; type++) 855 ext4_quota_off(sb, type); 856 } 857 } 858 #else 859 static inline void ext4_quota_off_umount(struct super_block *sb) 860 { 861 } 862 #endif 863 864 static void ext4_put_super(struct super_block *sb) 865 { 866 struct ext4_sb_info *sbi = EXT4_SB(sb); 867 struct ext4_super_block *es = sbi->s_es; 868 int aborted = 0; 869 int i, err; 870 871 ext4_unregister_li_request(sb); 872 ext4_quota_off_umount(sb); 873 874 flush_workqueue(sbi->rsv_conversion_wq); 875 destroy_workqueue(sbi->rsv_conversion_wq); 876 877 if (sbi->s_journal) { 878 aborted = is_journal_aborted(sbi->s_journal); 879 err = jbd2_journal_destroy(sbi->s_journal); 880 sbi->s_journal = NULL; 881 if ((err < 0) && !aborted) 882 ext4_abort(sb, "Couldn't clean up the journal"); 883 } 884 885 ext4_unregister_sysfs(sb); 886 ext4_es_unregister_shrinker(sbi); 887 del_timer_sync(&sbi->s_err_report); 888 ext4_release_system_zone(sb); 889 ext4_mb_release(sb); 890 ext4_ext_release(sb); 891 892 if (!(sb->s_flags & MS_RDONLY) && !aborted) { 893 ext4_clear_feature_journal_needs_recovery(sb); 894 es->s_state = cpu_to_le16(sbi->s_mount_state); 895 } 896 if (!(sb->s_flags & MS_RDONLY)) 897 ext4_commit_super(sb, 1); 898 899 for (i = 0; i < sbi->s_gdb_count; i++) 900 brelse(sbi->s_group_desc[i]); 901 kvfree(sbi->s_group_desc); 902 kvfree(sbi->s_flex_groups); 903 percpu_counter_destroy(&sbi->s_freeclusters_counter); 904 percpu_counter_destroy(&sbi->s_freeinodes_counter); 905 percpu_counter_destroy(&sbi->s_dirs_counter); 906 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 907 percpu_free_rwsem(&sbi->s_journal_flag_rwsem); 908 #ifdef CONFIG_QUOTA 909 for (i = 0; i < EXT4_MAXQUOTAS; i++) 910 kfree(sbi->s_qf_names[i]); 911 #endif 912 913 /* Debugging code just in case the in-memory inode orphan list 914 * isn't empty. The on-disk one can be non-empty if we've 915 * detected an error and taken the fs readonly, but the 916 * in-memory list had better be clean by this point. */ 917 if (!list_empty(&sbi->s_orphan)) 918 dump_orphan_list(sb, sbi); 919 J_ASSERT(list_empty(&sbi->s_orphan)); 920 921 sync_blockdev(sb->s_bdev); 922 invalidate_bdev(sb->s_bdev); 923 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 924 /* 925 * Invalidate the journal device's buffers. We don't want them 926 * floating about in memory - the physical journal device may 927 * hotswapped, and it breaks the `ro-after' testing code. 928 */ 929 sync_blockdev(sbi->journal_bdev); 930 invalidate_bdev(sbi->journal_bdev); 931 ext4_blkdev_remove(sbi); 932 } 933 if (sbi->s_mb_cache) { 934 ext4_xattr_destroy_cache(sbi->s_mb_cache); 935 sbi->s_mb_cache = NULL; 936 } 937 if (sbi->s_mmp_tsk) 938 kthread_stop(sbi->s_mmp_tsk); 939 brelse(sbi->s_sbh); 940 sb->s_fs_info = NULL; 941 /* 942 * Now that we are completely done shutting down the 943 * superblock, we need to actually destroy the kobject. 944 */ 945 kobject_put(&sbi->s_kobj); 946 wait_for_completion(&sbi->s_kobj_unregister); 947 if (sbi->s_chksum_driver) 948 crypto_free_shash(sbi->s_chksum_driver); 949 kfree(sbi->s_blockgroup_lock); 950 kfree(sbi); 951 } 952 953 static struct kmem_cache *ext4_inode_cachep; 954 955 /* 956 * Called inside transaction, so use GFP_NOFS 957 */ 958 static struct inode *ext4_alloc_inode(struct super_block *sb) 959 { 960 struct ext4_inode_info *ei; 961 962 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 963 if (!ei) 964 return NULL; 965 966 ei->vfs_inode.i_version = 1; 967 spin_lock_init(&ei->i_raw_lock); 968 INIT_LIST_HEAD(&ei->i_prealloc_list); 969 spin_lock_init(&ei->i_prealloc_lock); 970 ext4_es_init_tree(&ei->i_es_tree); 971 rwlock_init(&ei->i_es_lock); 972 INIT_LIST_HEAD(&ei->i_es_list); 973 ei->i_es_all_nr = 0; 974 ei->i_es_shk_nr = 0; 975 ei->i_es_shrink_lblk = 0; 976 ei->i_reserved_data_blocks = 0; 977 ei->i_reserved_meta_blocks = 0; 978 ei->i_allocated_meta_blocks = 0; 979 ei->i_da_metadata_calc_len = 0; 980 ei->i_da_metadata_calc_last_lblock = 0; 981 spin_lock_init(&(ei->i_block_reservation_lock)); 982 #ifdef CONFIG_QUOTA 983 ei->i_reserved_quota = 0; 984 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 985 #endif 986 ei->jinode = NULL; 987 INIT_LIST_HEAD(&ei->i_rsv_conversion_list); 988 spin_lock_init(&ei->i_completed_io_lock); 989 ei->i_sync_tid = 0; 990 ei->i_datasync_tid = 0; 991 atomic_set(&ei->i_unwritten, 0); 992 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); 993 return &ei->vfs_inode; 994 } 995 996 static int ext4_drop_inode(struct inode *inode) 997 { 998 int drop = generic_drop_inode(inode); 999 1000 trace_ext4_drop_inode(inode, drop); 1001 return drop; 1002 } 1003 1004 static void ext4_i_callback(struct rcu_head *head) 1005 { 1006 struct inode *inode = container_of(head, struct inode, i_rcu); 1007 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 1008 } 1009 1010 static void ext4_destroy_inode(struct inode *inode) 1011 { 1012 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 1013 ext4_msg(inode->i_sb, KERN_ERR, 1014 "Inode %lu (%p): orphan list check failed!", 1015 inode->i_ino, EXT4_I(inode)); 1016 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 1017 EXT4_I(inode), sizeof(struct ext4_inode_info), 1018 true); 1019 dump_stack(); 1020 } 1021 call_rcu(&inode->i_rcu, ext4_i_callback); 1022 } 1023 1024 static void init_once(void *foo) 1025 { 1026 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 1027 1028 INIT_LIST_HEAD(&ei->i_orphan); 1029 init_rwsem(&ei->xattr_sem); 1030 init_rwsem(&ei->i_data_sem); 1031 init_rwsem(&ei->i_mmap_sem); 1032 inode_init_once(&ei->vfs_inode); 1033 } 1034 1035 static int __init init_inodecache(void) 1036 { 1037 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 1038 sizeof(struct ext4_inode_info), 1039 0, (SLAB_RECLAIM_ACCOUNT| 1040 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 1041 init_once); 1042 if (ext4_inode_cachep == NULL) 1043 return -ENOMEM; 1044 return 0; 1045 } 1046 1047 static void destroy_inodecache(void) 1048 { 1049 /* 1050 * Make sure all delayed rcu free inodes are flushed before we 1051 * destroy cache. 1052 */ 1053 rcu_barrier(); 1054 kmem_cache_destroy(ext4_inode_cachep); 1055 } 1056 1057 void ext4_clear_inode(struct inode *inode) 1058 { 1059 invalidate_inode_buffers(inode); 1060 clear_inode(inode); 1061 dquot_drop(inode); 1062 ext4_discard_preallocations(inode); 1063 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); 1064 if (EXT4_I(inode)->jinode) { 1065 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 1066 EXT4_I(inode)->jinode); 1067 jbd2_free_inode(EXT4_I(inode)->jinode); 1068 EXT4_I(inode)->jinode = NULL; 1069 } 1070 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1071 fscrypt_put_encryption_info(inode, NULL); 1072 #endif 1073 } 1074 1075 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1076 u64 ino, u32 generation) 1077 { 1078 struct inode *inode; 1079 1080 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1081 return ERR_PTR(-ESTALE); 1082 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1083 return ERR_PTR(-ESTALE); 1084 1085 /* iget isn't really right if the inode is currently unallocated!! 1086 * 1087 * ext4_read_inode will return a bad_inode if the inode had been 1088 * deleted, so we should be safe. 1089 * 1090 * Currently we don't know the generation for parent directory, so 1091 * a generation of 0 means "accept any" 1092 */ 1093 inode = ext4_iget_normal(sb, ino); 1094 if (IS_ERR(inode)) 1095 return ERR_CAST(inode); 1096 if (generation && inode->i_generation != generation) { 1097 iput(inode); 1098 return ERR_PTR(-ESTALE); 1099 } 1100 1101 return inode; 1102 } 1103 1104 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1105 int fh_len, int fh_type) 1106 { 1107 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1108 ext4_nfs_get_inode); 1109 } 1110 1111 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1112 int fh_len, int fh_type) 1113 { 1114 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1115 ext4_nfs_get_inode); 1116 } 1117 1118 /* 1119 * Try to release metadata pages (indirect blocks, directories) which are 1120 * mapped via the block device. Since these pages could have journal heads 1121 * which would prevent try_to_free_buffers() from freeing them, we must use 1122 * jbd2 layer's try_to_free_buffers() function to release them. 1123 */ 1124 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1125 gfp_t wait) 1126 { 1127 journal_t *journal = EXT4_SB(sb)->s_journal; 1128 1129 WARN_ON(PageChecked(page)); 1130 if (!page_has_buffers(page)) 1131 return 0; 1132 if (journal) 1133 return jbd2_journal_try_to_free_buffers(journal, page, 1134 wait & ~__GFP_DIRECT_RECLAIM); 1135 return try_to_free_buffers(page); 1136 } 1137 1138 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1139 static int ext4_get_context(struct inode *inode, void *ctx, size_t len) 1140 { 1141 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION, 1142 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len); 1143 } 1144 1145 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len, 1146 void *fs_data) 1147 { 1148 handle_t *handle = fs_data; 1149 int res, res2, retries = 0; 1150 1151 res = ext4_convert_inline_data(inode); 1152 if (res) 1153 return res; 1154 1155 /* 1156 * If a journal handle was specified, then the encryption context is 1157 * being set on a new inode via inheritance and is part of a larger 1158 * transaction to create the inode. Otherwise the encryption context is 1159 * being set on an existing inode in its own transaction. Only in the 1160 * latter case should the "retry on ENOSPC" logic be used. 1161 */ 1162 1163 if (handle) { 1164 res = ext4_xattr_set_handle(handle, inode, 1165 EXT4_XATTR_INDEX_ENCRYPTION, 1166 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, 1167 ctx, len, 0); 1168 if (!res) { 1169 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT); 1170 ext4_clear_inode_state(inode, 1171 EXT4_STATE_MAY_INLINE_DATA); 1172 /* 1173 * Update inode->i_flags - e.g. S_DAX may get disabled 1174 */ 1175 ext4_set_inode_flags(inode); 1176 } 1177 return res; 1178 } 1179 1180 retry: 1181 handle = ext4_journal_start(inode, EXT4_HT_MISC, 1182 ext4_jbd2_credits_xattr(inode)); 1183 if (IS_ERR(handle)) 1184 return PTR_ERR(handle); 1185 1186 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION, 1187 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, 1188 ctx, len, 0); 1189 if (!res) { 1190 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT); 1191 /* Update inode->i_flags - e.g. S_DAX may get disabled */ 1192 ext4_set_inode_flags(inode); 1193 res = ext4_mark_inode_dirty(handle, inode); 1194 if (res) 1195 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty"); 1196 } 1197 res2 = ext4_journal_stop(handle); 1198 1199 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) 1200 goto retry; 1201 if (!res) 1202 res = res2; 1203 return res; 1204 } 1205 1206 static int ext4_dummy_context(struct inode *inode) 1207 { 1208 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb)); 1209 } 1210 1211 static unsigned ext4_max_namelen(struct inode *inode) 1212 { 1213 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize : 1214 EXT4_NAME_LEN; 1215 } 1216 1217 static const struct fscrypt_operations ext4_cryptops = { 1218 .key_prefix = "ext4:", 1219 .get_context = ext4_get_context, 1220 .set_context = ext4_set_context, 1221 .dummy_context = ext4_dummy_context, 1222 .is_encrypted = ext4_encrypted_inode, 1223 .empty_dir = ext4_empty_dir, 1224 .max_namelen = ext4_max_namelen, 1225 }; 1226 #else 1227 static const struct fscrypt_operations ext4_cryptops = { 1228 .is_encrypted = ext4_encrypted_inode, 1229 }; 1230 #endif 1231 1232 #ifdef CONFIG_QUOTA 1233 static char *quotatypes[] = INITQFNAMES; 1234 #define QTYPE2NAME(t) (quotatypes[t]) 1235 1236 static int ext4_write_dquot(struct dquot *dquot); 1237 static int ext4_acquire_dquot(struct dquot *dquot); 1238 static int ext4_release_dquot(struct dquot *dquot); 1239 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1240 static int ext4_write_info(struct super_block *sb, int type); 1241 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1242 const struct path *path); 1243 static int ext4_quota_on_mount(struct super_block *sb, int type); 1244 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1245 size_t len, loff_t off); 1246 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1247 const char *data, size_t len, loff_t off); 1248 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 1249 unsigned int flags); 1250 static int ext4_enable_quotas(struct super_block *sb); 1251 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid); 1252 1253 static struct dquot **ext4_get_dquots(struct inode *inode) 1254 { 1255 return EXT4_I(inode)->i_dquot; 1256 } 1257 1258 static const struct dquot_operations ext4_quota_operations = { 1259 .get_reserved_space = ext4_get_reserved_space, 1260 .write_dquot = ext4_write_dquot, 1261 .acquire_dquot = ext4_acquire_dquot, 1262 .release_dquot = ext4_release_dquot, 1263 .mark_dirty = ext4_mark_dquot_dirty, 1264 .write_info = ext4_write_info, 1265 .alloc_dquot = dquot_alloc, 1266 .destroy_dquot = dquot_destroy, 1267 .get_projid = ext4_get_projid, 1268 .get_next_id = ext4_get_next_id, 1269 }; 1270 1271 static const struct quotactl_ops ext4_qctl_operations = { 1272 .quota_on = ext4_quota_on, 1273 .quota_off = ext4_quota_off, 1274 .quota_sync = dquot_quota_sync, 1275 .get_state = dquot_get_state, 1276 .set_info = dquot_set_dqinfo, 1277 .get_dqblk = dquot_get_dqblk, 1278 .set_dqblk = dquot_set_dqblk, 1279 .get_nextdqblk = dquot_get_next_dqblk, 1280 }; 1281 #endif 1282 1283 static const struct super_operations ext4_sops = { 1284 .alloc_inode = ext4_alloc_inode, 1285 .destroy_inode = ext4_destroy_inode, 1286 .write_inode = ext4_write_inode, 1287 .dirty_inode = ext4_dirty_inode, 1288 .drop_inode = ext4_drop_inode, 1289 .evict_inode = ext4_evict_inode, 1290 .put_super = ext4_put_super, 1291 .sync_fs = ext4_sync_fs, 1292 .freeze_fs = ext4_freeze, 1293 .unfreeze_fs = ext4_unfreeze, 1294 .statfs = ext4_statfs, 1295 .remount_fs = ext4_remount, 1296 .show_options = ext4_show_options, 1297 #ifdef CONFIG_QUOTA 1298 .quota_read = ext4_quota_read, 1299 .quota_write = ext4_quota_write, 1300 .get_dquots = ext4_get_dquots, 1301 #endif 1302 .bdev_try_to_free_page = bdev_try_to_free_page, 1303 }; 1304 1305 static const struct export_operations ext4_export_ops = { 1306 .fh_to_dentry = ext4_fh_to_dentry, 1307 .fh_to_parent = ext4_fh_to_parent, 1308 .get_parent = ext4_get_parent, 1309 }; 1310 1311 enum { 1312 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1313 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1314 Opt_nouid32, Opt_debug, Opt_removed, 1315 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1316 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 1317 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, 1318 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, 1319 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1320 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, 1321 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1322 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1323 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1324 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax, 1325 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 1326 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize, 1327 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1328 Opt_inode_readahead_blks, Opt_journal_ioprio, 1329 Opt_dioread_nolock, Opt_dioread_lock, 1330 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1331 Opt_max_dir_size_kb, Opt_nojournal_checksum, 1332 }; 1333 1334 static const match_table_t tokens = { 1335 {Opt_bsd_df, "bsddf"}, 1336 {Opt_minix_df, "minixdf"}, 1337 {Opt_grpid, "grpid"}, 1338 {Opt_grpid, "bsdgroups"}, 1339 {Opt_nogrpid, "nogrpid"}, 1340 {Opt_nogrpid, "sysvgroups"}, 1341 {Opt_resgid, "resgid=%u"}, 1342 {Opt_resuid, "resuid=%u"}, 1343 {Opt_sb, "sb=%u"}, 1344 {Opt_err_cont, "errors=continue"}, 1345 {Opt_err_panic, "errors=panic"}, 1346 {Opt_err_ro, "errors=remount-ro"}, 1347 {Opt_nouid32, "nouid32"}, 1348 {Opt_debug, "debug"}, 1349 {Opt_removed, "oldalloc"}, 1350 {Opt_removed, "orlov"}, 1351 {Opt_user_xattr, "user_xattr"}, 1352 {Opt_nouser_xattr, "nouser_xattr"}, 1353 {Opt_acl, "acl"}, 1354 {Opt_noacl, "noacl"}, 1355 {Opt_noload, "norecovery"}, 1356 {Opt_noload, "noload"}, 1357 {Opt_removed, "nobh"}, 1358 {Opt_removed, "bh"}, 1359 {Opt_commit, "commit=%u"}, 1360 {Opt_min_batch_time, "min_batch_time=%u"}, 1361 {Opt_max_batch_time, "max_batch_time=%u"}, 1362 {Opt_journal_dev, "journal_dev=%u"}, 1363 {Opt_journal_path, "journal_path=%s"}, 1364 {Opt_journal_checksum, "journal_checksum"}, 1365 {Opt_nojournal_checksum, "nojournal_checksum"}, 1366 {Opt_journal_async_commit, "journal_async_commit"}, 1367 {Opt_abort, "abort"}, 1368 {Opt_data_journal, "data=journal"}, 1369 {Opt_data_ordered, "data=ordered"}, 1370 {Opt_data_writeback, "data=writeback"}, 1371 {Opt_data_err_abort, "data_err=abort"}, 1372 {Opt_data_err_ignore, "data_err=ignore"}, 1373 {Opt_offusrjquota, "usrjquota="}, 1374 {Opt_usrjquota, "usrjquota=%s"}, 1375 {Opt_offgrpjquota, "grpjquota="}, 1376 {Opt_grpjquota, "grpjquota=%s"}, 1377 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1378 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1379 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1380 {Opt_grpquota, "grpquota"}, 1381 {Opt_noquota, "noquota"}, 1382 {Opt_quota, "quota"}, 1383 {Opt_usrquota, "usrquota"}, 1384 {Opt_prjquota, "prjquota"}, 1385 {Opt_barrier, "barrier=%u"}, 1386 {Opt_barrier, "barrier"}, 1387 {Opt_nobarrier, "nobarrier"}, 1388 {Opt_i_version, "i_version"}, 1389 {Opt_dax, "dax"}, 1390 {Opt_stripe, "stripe=%u"}, 1391 {Opt_delalloc, "delalloc"}, 1392 {Opt_lazytime, "lazytime"}, 1393 {Opt_nolazytime, "nolazytime"}, 1394 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"}, 1395 {Opt_nodelalloc, "nodelalloc"}, 1396 {Opt_removed, "mblk_io_submit"}, 1397 {Opt_removed, "nomblk_io_submit"}, 1398 {Opt_block_validity, "block_validity"}, 1399 {Opt_noblock_validity, "noblock_validity"}, 1400 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1401 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1402 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1403 {Opt_auto_da_alloc, "auto_da_alloc"}, 1404 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1405 {Opt_dioread_nolock, "dioread_nolock"}, 1406 {Opt_dioread_lock, "dioread_lock"}, 1407 {Opt_discard, "discard"}, 1408 {Opt_nodiscard, "nodiscard"}, 1409 {Opt_init_itable, "init_itable=%u"}, 1410 {Opt_init_itable, "init_itable"}, 1411 {Opt_noinit_itable, "noinit_itable"}, 1412 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, 1413 {Opt_test_dummy_encryption, "test_dummy_encryption"}, 1414 {Opt_removed, "check=none"}, /* mount option from ext2/3 */ 1415 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ 1416 {Opt_removed, "reservation"}, /* mount option from ext2/3 */ 1417 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ 1418 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ 1419 {Opt_err, NULL}, 1420 }; 1421 1422 static ext4_fsblk_t get_sb_block(void **data) 1423 { 1424 ext4_fsblk_t sb_block; 1425 char *options = (char *) *data; 1426 1427 if (!options || strncmp(options, "sb=", 3) != 0) 1428 return 1; /* Default location */ 1429 1430 options += 3; 1431 /* TODO: use simple_strtoll with >32bit ext4 */ 1432 sb_block = simple_strtoul(options, &options, 0); 1433 if (*options && *options != ',') { 1434 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1435 (char *) *data); 1436 return 1; 1437 } 1438 if (*options == ',') 1439 options++; 1440 *data = (void *) options; 1441 1442 return sb_block; 1443 } 1444 1445 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1446 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1447 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1448 1449 #ifdef CONFIG_QUOTA 1450 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1451 { 1452 struct ext4_sb_info *sbi = EXT4_SB(sb); 1453 char *qname; 1454 int ret = -1; 1455 1456 if (sb_any_quota_loaded(sb) && 1457 !sbi->s_qf_names[qtype]) { 1458 ext4_msg(sb, KERN_ERR, 1459 "Cannot change journaled " 1460 "quota options when quota turned on"); 1461 return -1; 1462 } 1463 if (ext4_has_feature_quota(sb)) { 1464 ext4_msg(sb, KERN_INFO, "Journaled quota options " 1465 "ignored when QUOTA feature is enabled"); 1466 return 1; 1467 } 1468 qname = match_strdup(args); 1469 if (!qname) { 1470 ext4_msg(sb, KERN_ERR, 1471 "Not enough memory for storing quotafile name"); 1472 return -1; 1473 } 1474 if (sbi->s_qf_names[qtype]) { 1475 if (strcmp(sbi->s_qf_names[qtype], qname) == 0) 1476 ret = 1; 1477 else 1478 ext4_msg(sb, KERN_ERR, 1479 "%s quota file already specified", 1480 QTYPE2NAME(qtype)); 1481 goto errout; 1482 } 1483 if (strchr(qname, '/')) { 1484 ext4_msg(sb, KERN_ERR, 1485 "quotafile must be on filesystem root"); 1486 goto errout; 1487 } 1488 sbi->s_qf_names[qtype] = qname; 1489 set_opt(sb, QUOTA); 1490 return 1; 1491 errout: 1492 kfree(qname); 1493 return ret; 1494 } 1495 1496 static int clear_qf_name(struct super_block *sb, int qtype) 1497 { 1498 1499 struct ext4_sb_info *sbi = EXT4_SB(sb); 1500 1501 if (sb_any_quota_loaded(sb) && 1502 sbi->s_qf_names[qtype]) { 1503 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1504 " when quota turned on"); 1505 return -1; 1506 } 1507 kfree(sbi->s_qf_names[qtype]); 1508 sbi->s_qf_names[qtype] = NULL; 1509 return 1; 1510 } 1511 #endif 1512 1513 #define MOPT_SET 0x0001 1514 #define MOPT_CLEAR 0x0002 1515 #define MOPT_NOSUPPORT 0x0004 1516 #define MOPT_EXPLICIT 0x0008 1517 #define MOPT_CLEAR_ERR 0x0010 1518 #define MOPT_GTE0 0x0020 1519 #ifdef CONFIG_QUOTA 1520 #define MOPT_Q 0 1521 #define MOPT_QFMT 0x0040 1522 #else 1523 #define MOPT_Q MOPT_NOSUPPORT 1524 #define MOPT_QFMT MOPT_NOSUPPORT 1525 #endif 1526 #define MOPT_DATAJ 0x0080 1527 #define MOPT_NO_EXT2 0x0100 1528 #define MOPT_NO_EXT3 0x0200 1529 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) 1530 #define MOPT_STRING 0x0400 1531 1532 static const struct mount_opts { 1533 int token; 1534 int mount_opt; 1535 int flags; 1536 } ext4_mount_opts[] = { 1537 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, 1538 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, 1539 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, 1540 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, 1541 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, 1542 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, 1543 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, 1544 MOPT_EXT4_ONLY | MOPT_SET}, 1545 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, 1546 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1547 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, 1548 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, 1549 {Opt_delalloc, EXT4_MOUNT_DELALLOC, 1550 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1551 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, 1552 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1553 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1554 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1555 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1556 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1557 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | 1558 EXT4_MOUNT_JOURNAL_CHECKSUM), 1559 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1560 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, 1561 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, 1562 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, 1563 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, 1564 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, 1565 MOPT_NO_EXT2}, 1566 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, 1567 MOPT_NO_EXT2}, 1568 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, 1569 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, 1570 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, 1571 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, 1572 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, 1573 {Opt_commit, 0, MOPT_GTE0}, 1574 {Opt_max_batch_time, 0, MOPT_GTE0}, 1575 {Opt_min_batch_time, 0, MOPT_GTE0}, 1576 {Opt_inode_readahead_blks, 0, MOPT_GTE0}, 1577 {Opt_init_itable, 0, MOPT_GTE0}, 1578 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, 1579 {Opt_stripe, 0, MOPT_GTE0}, 1580 {Opt_resuid, 0, MOPT_GTE0}, 1581 {Opt_resgid, 0, MOPT_GTE0}, 1582 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0}, 1583 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING}, 1584 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0}, 1585 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1586 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1587 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, 1588 MOPT_NO_EXT2 | MOPT_DATAJ}, 1589 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, 1590 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, 1591 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1592 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, 1593 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, 1594 #else 1595 {Opt_acl, 0, MOPT_NOSUPPORT}, 1596 {Opt_noacl, 0, MOPT_NOSUPPORT}, 1597 #endif 1598 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, 1599 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, 1600 {Opt_debug_want_extra_isize, 0, MOPT_GTE0}, 1601 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, 1602 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, 1603 MOPT_SET | MOPT_Q}, 1604 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, 1605 MOPT_SET | MOPT_Q}, 1606 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA, 1607 MOPT_SET | MOPT_Q}, 1608 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 1609 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA), 1610 MOPT_CLEAR | MOPT_Q}, 1611 {Opt_usrjquota, 0, MOPT_Q}, 1612 {Opt_grpjquota, 0, MOPT_Q}, 1613 {Opt_offusrjquota, 0, MOPT_Q}, 1614 {Opt_offgrpjquota, 0, MOPT_Q}, 1615 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, 1616 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, 1617 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, 1618 {Opt_max_dir_size_kb, 0, MOPT_GTE0}, 1619 {Opt_test_dummy_encryption, 0, MOPT_GTE0}, 1620 {Opt_err, 0, 0} 1621 }; 1622 1623 static int handle_mount_opt(struct super_block *sb, char *opt, int token, 1624 substring_t *args, unsigned long *journal_devnum, 1625 unsigned int *journal_ioprio, int is_remount) 1626 { 1627 struct ext4_sb_info *sbi = EXT4_SB(sb); 1628 const struct mount_opts *m; 1629 kuid_t uid; 1630 kgid_t gid; 1631 int arg = 0; 1632 1633 #ifdef CONFIG_QUOTA 1634 if (token == Opt_usrjquota) 1635 return set_qf_name(sb, USRQUOTA, &args[0]); 1636 else if (token == Opt_grpjquota) 1637 return set_qf_name(sb, GRPQUOTA, &args[0]); 1638 else if (token == Opt_offusrjquota) 1639 return clear_qf_name(sb, USRQUOTA); 1640 else if (token == Opt_offgrpjquota) 1641 return clear_qf_name(sb, GRPQUOTA); 1642 #endif 1643 switch (token) { 1644 case Opt_noacl: 1645 case Opt_nouser_xattr: 1646 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); 1647 break; 1648 case Opt_sb: 1649 return 1; /* handled by get_sb_block() */ 1650 case Opt_removed: 1651 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); 1652 return 1; 1653 case Opt_abort: 1654 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1655 return 1; 1656 case Opt_i_version: 1657 sb->s_flags |= MS_I_VERSION; 1658 return 1; 1659 case Opt_lazytime: 1660 sb->s_flags |= MS_LAZYTIME; 1661 return 1; 1662 case Opt_nolazytime: 1663 sb->s_flags &= ~MS_LAZYTIME; 1664 return 1; 1665 } 1666 1667 for (m = ext4_mount_opts; m->token != Opt_err; m++) 1668 if (token == m->token) 1669 break; 1670 1671 if (m->token == Opt_err) { 1672 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " 1673 "or missing value", opt); 1674 return -1; 1675 } 1676 1677 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { 1678 ext4_msg(sb, KERN_ERR, 1679 "Mount option \"%s\" incompatible with ext2", opt); 1680 return -1; 1681 } 1682 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { 1683 ext4_msg(sb, KERN_ERR, 1684 "Mount option \"%s\" incompatible with ext3", opt); 1685 return -1; 1686 } 1687 1688 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg)) 1689 return -1; 1690 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) 1691 return -1; 1692 if (m->flags & MOPT_EXPLICIT) { 1693 if (m->mount_opt & EXT4_MOUNT_DELALLOC) { 1694 set_opt2(sb, EXPLICIT_DELALLOC); 1695 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { 1696 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM); 1697 } else 1698 return -1; 1699 } 1700 if (m->flags & MOPT_CLEAR_ERR) 1701 clear_opt(sb, ERRORS_MASK); 1702 if (token == Opt_noquota && sb_any_quota_loaded(sb)) { 1703 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1704 "options when quota turned on"); 1705 return -1; 1706 } 1707 1708 if (m->flags & MOPT_NOSUPPORT) { 1709 ext4_msg(sb, KERN_ERR, "%s option not supported", opt); 1710 } else if (token == Opt_commit) { 1711 if (arg == 0) 1712 arg = JBD2_DEFAULT_MAX_COMMIT_AGE; 1713 sbi->s_commit_interval = HZ * arg; 1714 } else if (token == Opt_debug_want_extra_isize) { 1715 sbi->s_want_extra_isize = arg; 1716 } else if (token == Opt_max_batch_time) { 1717 sbi->s_max_batch_time = arg; 1718 } else if (token == Opt_min_batch_time) { 1719 sbi->s_min_batch_time = arg; 1720 } else if (token == Opt_inode_readahead_blks) { 1721 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { 1722 ext4_msg(sb, KERN_ERR, 1723 "EXT4-fs: inode_readahead_blks must be " 1724 "0 or a power of 2 smaller than 2^31"); 1725 return -1; 1726 } 1727 sbi->s_inode_readahead_blks = arg; 1728 } else if (token == Opt_init_itable) { 1729 set_opt(sb, INIT_INODE_TABLE); 1730 if (!args->from) 1731 arg = EXT4_DEF_LI_WAIT_MULT; 1732 sbi->s_li_wait_mult = arg; 1733 } else if (token == Opt_max_dir_size_kb) { 1734 sbi->s_max_dir_size_kb = arg; 1735 } else if (token == Opt_stripe) { 1736 sbi->s_stripe = arg; 1737 } else if (token == Opt_resuid) { 1738 uid = make_kuid(current_user_ns(), arg); 1739 if (!uid_valid(uid)) { 1740 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); 1741 return -1; 1742 } 1743 sbi->s_resuid = uid; 1744 } else if (token == Opt_resgid) { 1745 gid = make_kgid(current_user_ns(), arg); 1746 if (!gid_valid(gid)) { 1747 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); 1748 return -1; 1749 } 1750 sbi->s_resgid = gid; 1751 } else if (token == Opt_journal_dev) { 1752 if (is_remount) { 1753 ext4_msg(sb, KERN_ERR, 1754 "Cannot specify journal on remount"); 1755 return -1; 1756 } 1757 *journal_devnum = arg; 1758 } else if (token == Opt_journal_path) { 1759 char *journal_path; 1760 struct inode *journal_inode; 1761 struct path path; 1762 int error; 1763 1764 if (is_remount) { 1765 ext4_msg(sb, KERN_ERR, 1766 "Cannot specify journal on remount"); 1767 return -1; 1768 } 1769 journal_path = match_strdup(&args[0]); 1770 if (!journal_path) { 1771 ext4_msg(sb, KERN_ERR, "error: could not dup " 1772 "journal device string"); 1773 return -1; 1774 } 1775 1776 error = kern_path(journal_path, LOOKUP_FOLLOW, &path); 1777 if (error) { 1778 ext4_msg(sb, KERN_ERR, "error: could not find " 1779 "journal device path: error %d", error); 1780 kfree(journal_path); 1781 return -1; 1782 } 1783 1784 journal_inode = d_inode(path.dentry); 1785 if (!S_ISBLK(journal_inode->i_mode)) { 1786 ext4_msg(sb, KERN_ERR, "error: journal path %s " 1787 "is not a block device", journal_path); 1788 path_put(&path); 1789 kfree(journal_path); 1790 return -1; 1791 } 1792 1793 *journal_devnum = new_encode_dev(journal_inode->i_rdev); 1794 path_put(&path); 1795 kfree(journal_path); 1796 } else if (token == Opt_journal_ioprio) { 1797 if (arg > 7) { 1798 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" 1799 " (must be 0-7)"); 1800 return -1; 1801 } 1802 *journal_ioprio = 1803 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); 1804 } else if (token == Opt_test_dummy_encryption) { 1805 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1806 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; 1807 ext4_msg(sb, KERN_WARNING, 1808 "Test dummy encryption mode enabled"); 1809 #else 1810 ext4_msg(sb, KERN_WARNING, 1811 "Test dummy encryption mount option ignored"); 1812 #endif 1813 } else if (m->flags & MOPT_DATAJ) { 1814 if (is_remount) { 1815 if (!sbi->s_journal) 1816 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); 1817 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) { 1818 ext4_msg(sb, KERN_ERR, 1819 "Cannot change data mode on remount"); 1820 return -1; 1821 } 1822 } else { 1823 clear_opt(sb, DATA_FLAGS); 1824 sbi->s_mount_opt |= m->mount_opt; 1825 } 1826 #ifdef CONFIG_QUOTA 1827 } else if (m->flags & MOPT_QFMT) { 1828 if (sb_any_quota_loaded(sb) && 1829 sbi->s_jquota_fmt != m->mount_opt) { 1830 ext4_msg(sb, KERN_ERR, "Cannot change journaled " 1831 "quota options when quota turned on"); 1832 return -1; 1833 } 1834 if (ext4_has_feature_quota(sb)) { 1835 ext4_msg(sb, KERN_INFO, 1836 "Quota format mount options ignored " 1837 "when QUOTA feature is enabled"); 1838 return 1; 1839 } 1840 sbi->s_jquota_fmt = m->mount_opt; 1841 #endif 1842 } else if (token == Opt_dax) { 1843 #ifdef CONFIG_FS_DAX 1844 ext4_msg(sb, KERN_WARNING, 1845 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 1846 sbi->s_mount_opt |= m->mount_opt; 1847 #else 1848 ext4_msg(sb, KERN_INFO, "dax option not supported"); 1849 return -1; 1850 #endif 1851 } else if (token == Opt_data_err_abort) { 1852 sbi->s_mount_opt |= m->mount_opt; 1853 } else if (token == Opt_data_err_ignore) { 1854 sbi->s_mount_opt &= ~m->mount_opt; 1855 } else { 1856 if (!args->from) 1857 arg = 1; 1858 if (m->flags & MOPT_CLEAR) 1859 arg = !arg; 1860 else if (unlikely(!(m->flags & MOPT_SET))) { 1861 ext4_msg(sb, KERN_WARNING, 1862 "buggy handling of option %s", opt); 1863 WARN_ON(1); 1864 return -1; 1865 } 1866 if (arg != 0) 1867 sbi->s_mount_opt |= m->mount_opt; 1868 else 1869 sbi->s_mount_opt &= ~m->mount_opt; 1870 } 1871 return 1; 1872 } 1873 1874 static int parse_options(char *options, struct super_block *sb, 1875 unsigned long *journal_devnum, 1876 unsigned int *journal_ioprio, 1877 int is_remount) 1878 { 1879 struct ext4_sb_info *sbi = EXT4_SB(sb); 1880 char *p; 1881 substring_t args[MAX_OPT_ARGS]; 1882 int token; 1883 1884 if (!options) 1885 return 1; 1886 1887 while ((p = strsep(&options, ",")) != NULL) { 1888 if (!*p) 1889 continue; 1890 /* 1891 * Initialize args struct so we know whether arg was 1892 * found; some options take optional arguments. 1893 */ 1894 args[0].to = args[0].from = NULL; 1895 token = match_token(p, tokens, args); 1896 if (handle_mount_opt(sb, p, token, args, journal_devnum, 1897 journal_ioprio, is_remount) < 0) 1898 return 0; 1899 } 1900 #ifdef CONFIG_QUOTA 1901 /* 1902 * We do the test below only for project quotas. 'usrquota' and 1903 * 'grpquota' mount options are allowed even without quota feature 1904 * to support legacy quotas in quota files. 1905 */ 1906 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) { 1907 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. " 1908 "Cannot enable project quota enforcement."); 1909 return 0; 1910 } 1911 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1912 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1913 clear_opt(sb, USRQUOTA); 1914 1915 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1916 clear_opt(sb, GRPQUOTA); 1917 1918 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1919 ext4_msg(sb, KERN_ERR, "old and new quota " 1920 "format mixing"); 1921 return 0; 1922 } 1923 1924 if (!sbi->s_jquota_fmt) { 1925 ext4_msg(sb, KERN_ERR, "journaled quota format " 1926 "not specified"); 1927 return 0; 1928 } 1929 } 1930 #endif 1931 if (test_opt(sb, DIOREAD_NOLOCK)) { 1932 int blocksize = 1933 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 1934 1935 if (blocksize < PAGE_SIZE) { 1936 ext4_msg(sb, KERN_ERR, "can't mount with " 1937 "dioread_nolock if block size != PAGE_SIZE"); 1938 return 0; 1939 } 1940 } 1941 return 1; 1942 } 1943 1944 static inline void ext4_show_quota_options(struct seq_file *seq, 1945 struct super_block *sb) 1946 { 1947 #if defined(CONFIG_QUOTA) 1948 struct ext4_sb_info *sbi = EXT4_SB(sb); 1949 1950 if (sbi->s_jquota_fmt) { 1951 char *fmtname = ""; 1952 1953 switch (sbi->s_jquota_fmt) { 1954 case QFMT_VFS_OLD: 1955 fmtname = "vfsold"; 1956 break; 1957 case QFMT_VFS_V0: 1958 fmtname = "vfsv0"; 1959 break; 1960 case QFMT_VFS_V1: 1961 fmtname = "vfsv1"; 1962 break; 1963 } 1964 seq_printf(seq, ",jqfmt=%s", fmtname); 1965 } 1966 1967 if (sbi->s_qf_names[USRQUOTA]) 1968 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]); 1969 1970 if (sbi->s_qf_names[GRPQUOTA]) 1971 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]); 1972 #endif 1973 } 1974 1975 static const char *token2str(int token) 1976 { 1977 const struct match_token *t; 1978 1979 for (t = tokens; t->token != Opt_err; t++) 1980 if (t->token == token && !strchr(t->pattern, '=')) 1981 break; 1982 return t->pattern; 1983 } 1984 1985 /* 1986 * Show an option if 1987 * - it's set to a non-default value OR 1988 * - if the per-sb default is different from the global default 1989 */ 1990 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, 1991 int nodefs) 1992 { 1993 struct ext4_sb_info *sbi = EXT4_SB(sb); 1994 struct ext4_super_block *es = sbi->s_es; 1995 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; 1996 const struct mount_opts *m; 1997 char sep = nodefs ? '\n' : ','; 1998 1999 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) 2000 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) 2001 2002 if (sbi->s_sb_block != 1) 2003 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); 2004 2005 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 2006 int want_set = m->flags & MOPT_SET; 2007 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || 2008 (m->flags & MOPT_CLEAR_ERR)) 2009 continue; 2010 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) 2011 continue; /* skip if same as the default */ 2012 if ((want_set && 2013 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || 2014 (!want_set && (sbi->s_mount_opt & m->mount_opt))) 2015 continue; /* select Opt_noFoo vs Opt_Foo */ 2016 SEQ_OPTS_PRINT("%s", token2str(m->token)); 2017 } 2018 2019 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || 2020 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) 2021 SEQ_OPTS_PRINT("resuid=%u", 2022 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 2023 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || 2024 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) 2025 SEQ_OPTS_PRINT("resgid=%u", 2026 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 2027 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); 2028 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) 2029 SEQ_OPTS_PUTS("errors=remount-ro"); 2030 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 2031 SEQ_OPTS_PUTS("errors=continue"); 2032 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 2033 SEQ_OPTS_PUTS("errors=panic"); 2034 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 2035 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); 2036 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) 2037 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); 2038 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) 2039 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); 2040 if (sb->s_flags & MS_I_VERSION) 2041 SEQ_OPTS_PUTS("i_version"); 2042 if (nodefs || sbi->s_stripe) 2043 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); 2044 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { 2045 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 2046 SEQ_OPTS_PUTS("data=journal"); 2047 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 2048 SEQ_OPTS_PUTS("data=ordered"); 2049 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 2050 SEQ_OPTS_PUTS("data=writeback"); 2051 } 2052 if (nodefs || 2053 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 2054 SEQ_OPTS_PRINT("inode_readahead_blks=%u", 2055 sbi->s_inode_readahead_blks); 2056 2057 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && 2058 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) 2059 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); 2060 if (nodefs || sbi->s_max_dir_size_kb) 2061 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); 2062 if (test_opt(sb, DATA_ERR_ABORT)) 2063 SEQ_OPTS_PUTS("data_err=abort"); 2064 2065 ext4_show_quota_options(seq, sb); 2066 return 0; 2067 } 2068 2069 static int ext4_show_options(struct seq_file *seq, struct dentry *root) 2070 { 2071 return _ext4_show_options(seq, root->d_sb, 0); 2072 } 2073 2074 int ext4_seq_options_show(struct seq_file *seq, void *offset) 2075 { 2076 struct super_block *sb = seq->private; 2077 int rc; 2078 2079 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); 2080 rc = _ext4_show_options(seq, sb, 1); 2081 seq_puts(seq, "\n"); 2082 return rc; 2083 } 2084 2085 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 2086 int read_only) 2087 { 2088 struct ext4_sb_info *sbi = EXT4_SB(sb); 2089 int res = 0; 2090 2091 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 2092 ext4_msg(sb, KERN_ERR, "revision level too high, " 2093 "forcing read-only mode"); 2094 res = MS_RDONLY; 2095 } 2096 if (read_only) 2097 goto done; 2098 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 2099 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 2100 "running e2fsck is recommended"); 2101 else if (sbi->s_mount_state & EXT4_ERROR_FS) 2102 ext4_msg(sb, KERN_WARNING, 2103 "warning: mounting fs with errors, " 2104 "running e2fsck is recommended"); 2105 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 2106 le16_to_cpu(es->s_mnt_count) >= 2107 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 2108 ext4_msg(sb, KERN_WARNING, 2109 "warning: maximal mount count reached, " 2110 "running e2fsck is recommended"); 2111 else if (le32_to_cpu(es->s_checkinterval) && 2112 (le32_to_cpu(es->s_lastcheck) + 2113 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 2114 ext4_msg(sb, KERN_WARNING, 2115 "warning: checktime reached, " 2116 "running e2fsck is recommended"); 2117 if (!sbi->s_journal) 2118 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 2119 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 2120 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 2121 le16_add_cpu(&es->s_mnt_count, 1); 2122 es->s_mtime = cpu_to_le32(get_seconds()); 2123 ext4_update_dynamic_rev(sb); 2124 if (sbi->s_journal) 2125 ext4_set_feature_journal_needs_recovery(sb); 2126 2127 ext4_commit_super(sb, 1); 2128 done: 2129 if (test_opt(sb, DEBUG)) 2130 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 2131 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 2132 sb->s_blocksize, 2133 sbi->s_groups_count, 2134 EXT4_BLOCKS_PER_GROUP(sb), 2135 EXT4_INODES_PER_GROUP(sb), 2136 sbi->s_mount_opt, sbi->s_mount_opt2); 2137 2138 cleancache_init_fs(sb); 2139 return res; 2140 } 2141 2142 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) 2143 { 2144 struct ext4_sb_info *sbi = EXT4_SB(sb); 2145 struct flex_groups *new_groups; 2146 int size; 2147 2148 if (!sbi->s_log_groups_per_flex) 2149 return 0; 2150 2151 size = ext4_flex_group(sbi, ngroup - 1) + 1; 2152 if (size <= sbi->s_flex_groups_allocated) 2153 return 0; 2154 2155 size = roundup_pow_of_two(size * sizeof(struct flex_groups)); 2156 new_groups = ext4_kvzalloc(size, GFP_KERNEL); 2157 if (!new_groups) { 2158 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", 2159 size / (int) sizeof(struct flex_groups)); 2160 return -ENOMEM; 2161 } 2162 2163 if (sbi->s_flex_groups) { 2164 memcpy(new_groups, sbi->s_flex_groups, 2165 (sbi->s_flex_groups_allocated * 2166 sizeof(struct flex_groups))); 2167 kvfree(sbi->s_flex_groups); 2168 } 2169 sbi->s_flex_groups = new_groups; 2170 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); 2171 return 0; 2172 } 2173 2174 static int ext4_fill_flex_info(struct super_block *sb) 2175 { 2176 struct ext4_sb_info *sbi = EXT4_SB(sb); 2177 struct ext4_group_desc *gdp = NULL; 2178 ext4_group_t flex_group; 2179 int i, err; 2180 2181 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 2182 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 2183 sbi->s_log_groups_per_flex = 0; 2184 return 1; 2185 } 2186 2187 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); 2188 if (err) 2189 goto failed; 2190 2191 for (i = 0; i < sbi->s_groups_count; i++) { 2192 gdp = ext4_get_group_desc(sb, i, NULL); 2193 2194 flex_group = ext4_flex_group(sbi, i); 2195 atomic_add(ext4_free_inodes_count(sb, gdp), 2196 &sbi->s_flex_groups[flex_group].free_inodes); 2197 atomic64_add(ext4_free_group_clusters(sb, gdp), 2198 &sbi->s_flex_groups[flex_group].free_clusters); 2199 atomic_add(ext4_used_dirs_count(sb, gdp), 2200 &sbi->s_flex_groups[flex_group].used_dirs); 2201 } 2202 2203 return 1; 2204 failed: 2205 return 0; 2206 } 2207 2208 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, 2209 struct ext4_group_desc *gdp) 2210 { 2211 int offset = offsetof(struct ext4_group_desc, bg_checksum); 2212 __u16 crc = 0; 2213 __le32 le_group = cpu_to_le32(block_group); 2214 struct ext4_sb_info *sbi = EXT4_SB(sb); 2215 2216 if (ext4_has_metadata_csum(sbi->s_sb)) { 2217 /* Use new metadata_csum algorithm */ 2218 __u32 csum32; 2219 __u16 dummy_csum = 0; 2220 2221 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, 2222 sizeof(le_group)); 2223 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset); 2224 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum, 2225 sizeof(dummy_csum)); 2226 offset += sizeof(dummy_csum); 2227 if (offset < sbi->s_desc_size) 2228 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset, 2229 sbi->s_desc_size - offset); 2230 2231 crc = csum32 & 0xFFFF; 2232 goto out; 2233 } 2234 2235 /* old crc16 code */ 2236 if (!ext4_has_feature_gdt_csum(sb)) 2237 return 0; 2238 2239 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 2240 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 2241 crc = crc16(crc, (__u8 *)gdp, offset); 2242 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 2243 /* for checksum of struct ext4_group_desc do the rest...*/ 2244 if (ext4_has_feature_64bit(sb) && 2245 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 2246 crc = crc16(crc, (__u8 *)gdp + offset, 2247 le16_to_cpu(sbi->s_es->s_desc_size) - 2248 offset); 2249 2250 out: 2251 return cpu_to_le16(crc); 2252 } 2253 2254 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, 2255 struct ext4_group_desc *gdp) 2256 { 2257 if (ext4_has_group_desc_csum(sb) && 2258 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) 2259 return 0; 2260 2261 return 1; 2262 } 2263 2264 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, 2265 struct ext4_group_desc *gdp) 2266 { 2267 if (!ext4_has_group_desc_csum(sb)) 2268 return; 2269 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); 2270 } 2271 2272 /* Called at mount-time, super-block is locked */ 2273 static int ext4_check_descriptors(struct super_block *sb, 2274 ext4_fsblk_t sb_block, 2275 ext4_group_t *first_not_zeroed) 2276 { 2277 struct ext4_sb_info *sbi = EXT4_SB(sb); 2278 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 2279 ext4_fsblk_t last_block; 2280 ext4_fsblk_t block_bitmap; 2281 ext4_fsblk_t inode_bitmap; 2282 ext4_fsblk_t inode_table; 2283 int flexbg_flag = 0; 2284 ext4_group_t i, grp = sbi->s_groups_count; 2285 2286 if (ext4_has_feature_flex_bg(sb)) 2287 flexbg_flag = 1; 2288 2289 ext4_debug("Checking group descriptors"); 2290 2291 for (i = 0; i < sbi->s_groups_count; i++) { 2292 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2293 2294 if (i == sbi->s_groups_count - 1 || flexbg_flag) 2295 last_block = ext4_blocks_count(sbi->s_es) - 1; 2296 else 2297 last_block = first_block + 2298 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2299 2300 if ((grp == sbi->s_groups_count) && 2301 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2302 grp = i; 2303 2304 block_bitmap = ext4_block_bitmap(sb, gdp); 2305 if (block_bitmap == sb_block) { 2306 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2307 "Block bitmap for group %u overlaps " 2308 "superblock", i); 2309 } 2310 if (block_bitmap < first_block || block_bitmap > last_block) { 2311 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2312 "Block bitmap for group %u not in group " 2313 "(block %llu)!", i, block_bitmap); 2314 return 0; 2315 } 2316 inode_bitmap = ext4_inode_bitmap(sb, gdp); 2317 if (inode_bitmap == sb_block) { 2318 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2319 "Inode bitmap for group %u overlaps " 2320 "superblock", i); 2321 } 2322 if (inode_bitmap < first_block || inode_bitmap > last_block) { 2323 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2324 "Inode bitmap for group %u not in group " 2325 "(block %llu)!", i, inode_bitmap); 2326 return 0; 2327 } 2328 inode_table = ext4_inode_table(sb, gdp); 2329 if (inode_table == sb_block) { 2330 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2331 "Inode table for group %u overlaps " 2332 "superblock", i); 2333 } 2334 if (inode_table < first_block || 2335 inode_table + sbi->s_itb_per_group - 1 > last_block) { 2336 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2337 "Inode table for group %u not in group " 2338 "(block %llu)!", i, inode_table); 2339 return 0; 2340 } 2341 ext4_lock_group(sb, i); 2342 if (!ext4_group_desc_csum_verify(sb, i, gdp)) { 2343 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2344 "Checksum for group %u failed (%u!=%u)", 2345 i, le16_to_cpu(ext4_group_desc_csum(sb, i, 2346 gdp)), le16_to_cpu(gdp->bg_checksum)); 2347 if (!(sb->s_flags & MS_RDONLY)) { 2348 ext4_unlock_group(sb, i); 2349 return 0; 2350 } 2351 } 2352 ext4_unlock_group(sb, i); 2353 if (!flexbg_flag) 2354 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2355 } 2356 if (NULL != first_not_zeroed) 2357 *first_not_zeroed = grp; 2358 return 1; 2359 } 2360 2361 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2362 * the superblock) which were deleted from all directories, but held open by 2363 * a process at the time of a crash. We walk the list and try to delete these 2364 * inodes at recovery time (only with a read-write filesystem). 2365 * 2366 * In order to keep the orphan inode chain consistent during traversal (in 2367 * case of crash during recovery), we link each inode into the superblock 2368 * orphan list_head and handle it the same way as an inode deletion during 2369 * normal operation (which journals the operations for us). 2370 * 2371 * We only do an iget() and an iput() on each inode, which is very safe if we 2372 * accidentally point at an in-use or already deleted inode. The worst that 2373 * can happen in this case is that we get a "bit already cleared" message from 2374 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2375 * e2fsck was run on this filesystem, and it must have already done the orphan 2376 * inode cleanup for us, so we can safely abort without any further action. 2377 */ 2378 static void ext4_orphan_cleanup(struct super_block *sb, 2379 struct ext4_super_block *es) 2380 { 2381 unsigned int s_flags = sb->s_flags; 2382 int ret, nr_orphans = 0, nr_truncates = 0; 2383 #ifdef CONFIG_QUOTA 2384 int i; 2385 #endif 2386 if (!es->s_last_orphan) { 2387 jbd_debug(4, "no orphan inodes to clean up\n"); 2388 return; 2389 } 2390 2391 if (bdev_read_only(sb->s_bdev)) { 2392 ext4_msg(sb, KERN_ERR, "write access " 2393 "unavailable, skipping orphan cleanup"); 2394 return; 2395 } 2396 2397 /* Check if feature set would not allow a r/w mount */ 2398 if (!ext4_feature_set_ok(sb, 0)) { 2399 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2400 "unknown ROCOMPAT features"); 2401 return; 2402 } 2403 2404 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2405 /* don't clear list on RO mount w/ errors */ 2406 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { 2407 ext4_msg(sb, KERN_INFO, "Errors on filesystem, " 2408 "clearing orphan list.\n"); 2409 es->s_last_orphan = 0; 2410 } 2411 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2412 return; 2413 } 2414 2415 if (s_flags & MS_RDONLY) { 2416 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2417 sb->s_flags &= ~MS_RDONLY; 2418 } 2419 #ifdef CONFIG_QUOTA 2420 /* Needed for iput() to work correctly and not trash data */ 2421 sb->s_flags |= MS_ACTIVE; 2422 /* Turn on quotas so that they are updated correctly */ 2423 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2424 if (EXT4_SB(sb)->s_qf_names[i]) { 2425 int ret = ext4_quota_on_mount(sb, i); 2426 if (ret < 0) 2427 ext4_msg(sb, KERN_ERR, 2428 "Cannot turn on journaled " 2429 "quota: error %d", ret); 2430 } 2431 } 2432 #endif 2433 2434 while (es->s_last_orphan) { 2435 struct inode *inode; 2436 2437 /* 2438 * We may have encountered an error during cleanup; if 2439 * so, skip the rest. 2440 */ 2441 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2442 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2443 es->s_last_orphan = 0; 2444 break; 2445 } 2446 2447 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2448 if (IS_ERR(inode)) { 2449 es->s_last_orphan = 0; 2450 break; 2451 } 2452 2453 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2454 dquot_initialize(inode); 2455 if (inode->i_nlink) { 2456 if (test_opt(sb, DEBUG)) 2457 ext4_msg(sb, KERN_DEBUG, 2458 "%s: truncating inode %lu to %lld bytes", 2459 __func__, inode->i_ino, inode->i_size); 2460 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2461 inode->i_ino, inode->i_size); 2462 inode_lock(inode); 2463 truncate_inode_pages(inode->i_mapping, inode->i_size); 2464 ret = ext4_truncate(inode); 2465 if (ret) 2466 ext4_std_error(inode->i_sb, ret); 2467 inode_unlock(inode); 2468 nr_truncates++; 2469 } else { 2470 if (test_opt(sb, DEBUG)) 2471 ext4_msg(sb, KERN_DEBUG, 2472 "%s: deleting unreferenced inode %lu", 2473 __func__, inode->i_ino); 2474 jbd_debug(2, "deleting unreferenced inode %lu\n", 2475 inode->i_ino); 2476 nr_orphans++; 2477 } 2478 iput(inode); /* The delete magic happens here! */ 2479 } 2480 2481 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2482 2483 if (nr_orphans) 2484 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2485 PLURAL(nr_orphans)); 2486 if (nr_truncates) 2487 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2488 PLURAL(nr_truncates)); 2489 #ifdef CONFIG_QUOTA 2490 /* Turn quotas off */ 2491 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2492 if (sb_dqopt(sb)->files[i]) 2493 dquot_quota_off(sb, i); 2494 } 2495 #endif 2496 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2497 } 2498 2499 /* 2500 * Maximal extent format file size. 2501 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2502 * extent format containers, within a sector_t, and within i_blocks 2503 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2504 * so that won't be a limiting factor. 2505 * 2506 * However there is other limiting factor. We do store extents in the form 2507 * of starting block and length, hence the resulting length of the extent 2508 * covering maximum file size must fit into on-disk format containers as 2509 * well. Given that length is always by 1 unit bigger than max unit (because 2510 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2511 * 2512 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2513 */ 2514 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2515 { 2516 loff_t res; 2517 loff_t upper_limit = MAX_LFS_FILESIZE; 2518 2519 /* small i_blocks in vfs inode? */ 2520 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2521 /* 2522 * CONFIG_LBDAF is not enabled implies the inode 2523 * i_block represent total blocks in 512 bytes 2524 * 32 == size of vfs inode i_blocks * 8 2525 */ 2526 upper_limit = (1LL << 32) - 1; 2527 2528 /* total blocks in file system block size */ 2529 upper_limit >>= (blkbits - 9); 2530 upper_limit <<= blkbits; 2531 } 2532 2533 /* 2534 * 32-bit extent-start container, ee_block. We lower the maxbytes 2535 * by one fs block, so ee_len can cover the extent of maximum file 2536 * size 2537 */ 2538 res = (1LL << 32) - 1; 2539 res <<= blkbits; 2540 2541 /* Sanity check against vm- & vfs- imposed limits */ 2542 if (res > upper_limit) 2543 res = upper_limit; 2544 2545 return res; 2546 } 2547 2548 /* 2549 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2550 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2551 * We need to be 1 filesystem block less than the 2^48 sector limit. 2552 */ 2553 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2554 { 2555 loff_t res = EXT4_NDIR_BLOCKS; 2556 int meta_blocks; 2557 loff_t upper_limit; 2558 /* This is calculated to be the largest file size for a dense, block 2559 * mapped file such that the file's total number of 512-byte sectors, 2560 * including data and all indirect blocks, does not exceed (2^48 - 1). 2561 * 2562 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2563 * number of 512-byte sectors of the file. 2564 */ 2565 2566 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2567 /* 2568 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2569 * the inode i_block field represents total file blocks in 2570 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2571 */ 2572 upper_limit = (1LL << 32) - 1; 2573 2574 /* total blocks in file system block size */ 2575 upper_limit >>= (bits - 9); 2576 2577 } else { 2578 /* 2579 * We use 48 bit ext4_inode i_blocks 2580 * With EXT4_HUGE_FILE_FL set the i_blocks 2581 * represent total number of blocks in 2582 * file system block size 2583 */ 2584 upper_limit = (1LL << 48) - 1; 2585 2586 } 2587 2588 /* indirect blocks */ 2589 meta_blocks = 1; 2590 /* double indirect blocks */ 2591 meta_blocks += 1 + (1LL << (bits-2)); 2592 /* tripple indirect blocks */ 2593 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2594 2595 upper_limit -= meta_blocks; 2596 upper_limit <<= bits; 2597 2598 res += 1LL << (bits-2); 2599 res += 1LL << (2*(bits-2)); 2600 res += 1LL << (3*(bits-2)); 2601 res <<= bits; 2602 if (res > upper_limit) 2603 res = upper_limit; 2604 2605 if (res > MAX_LFS_FILESIZE) 2606 res = MAX_LFS_FILESIZE; 2607 2608 return res; 2609 } 2610 2611 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2612 ext4_fsblk_t logical_sb_block, int nr) 2613 { 2614 struct ext4_sb_info *sbi = EXT4_SB(sb); 2615 ext4_group_t bg, first_meta_bg; 2616 int has_super = 0; 2617 2618 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2619 2620 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg) 2621 return logical_sb_block + nr + 1; 2622 bg = sbi->s_desc_per_block * nr; 2623 if (ext4_bg_has_super(sb, bg)) 2624 has_super = 1; 2625 2626 /* 2627 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at 2628 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled 2629 * on modern mke2fs or blksize > 1k on older mke2fs) then we must 2630 * compensate. 2631 */ 2632 if (sb->s_blocksize == 1024 && nr == 0 && 2633 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0) 2634 has_super++; 2635 2636 return (has_super + ext4_group_first_block_no(sb, bg)); 2637 } 2638 2639 /** 2640 * ext4_get_stripe_size: Get the stripe size. 2641 * @sbi: In memory super block info 2642 * 2643 * If we have specified it via mount option, then 2644 * use the mount option value. If the value specified at mount time is 2645 * greater than the blocks per group use the super block value. 2646 * If the super block value is greater than blocks per group return 0. 2647 * Allocator needs it be less than blocks per group. 2648 * 2649 */ 2650 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2651 { 2652 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2653 unsigned long stripe_width = 2654 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2655 int ret; 2656 2657 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2658 ret = sbi->s_stripe; 2659 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group) 2660 ret = stripe_width; 2661 else if (stride && stride <= sbi->s_blocks_per_group) 2662 ret = stride; 2663 else 2664 ret = 0; 2665 2666 /* 2667 * If the stripe width is 1, this makes no sense and 2668 * we set it to 0 to turn off stripe handling code. 2669 */ 2670 if (ret <= 1) 2671 ret = 0; 2672 2673 return ret; 2674 } 2675 2676 /* 2677 * Check whether this filesystem can be mounted based on 2678 * the features present and the RDONLY/RDWR mount requested. 2679 * Returns 1 if this filesystem can be mounted as requested, 2680 * 0 if it cannot be. 2681 */ 2682 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2683 { 2684 if (ext4_has_unknown_ext4_incompat_features(sb)) { 2685 ext4_msg(sb, KERN_ERR, 2686 "Couldn't mount because of " 2687 "unsupported optional features (%x)", 2688 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2689 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2690 return 0; 2691 } 2692 2693 if (readonly) 2694 return 1; 2695 2696 if (ext4_has_feature_readonly(sb)) { 2697 ext4_msg(sb, KERN_INFO, "filesystem is read-only"); 2698 sb->s_flags |= MS_RDONLY; 2699 return 1; 2700 } 2701 2702 /* Check that feature set is OK for a read-write mount */ 2703 if (ext4_has_unknown_ext4_ro_compat_features(sb)) { 2704 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2705 "unsupported optional features (%x)", 2706 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2707 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2708 return 0; 2709 } 2710 /* 2711 * Large file size enabled file system can only be mounted 2712 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2713 */ 2714 if (ext4_has_feature_huge_file(sb)) { 2715 if (sizeof(blkcnt_t) < sizeof(u64)) { 2716 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2717 "cannot be mounted RDWR without " 2718 "CONFIG_LBDAF"); 2719 return 0; 2720 } 2721 } 2722 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) { 2723 ext4_msg(sb, KERN_ERR, 2724 "Can't support bigalloc feature without " 2725 "extents feature\n"); 2726 return 0; 2727 } 2728 2729 #ifndef CONFIG_QUOTA 2730 if (ext4_has_feature_quota(sb) && !readonly) { 2731 ext4_msg(sb, KERN_ERR, 2732 "Filesystem with quota feature cannot be mounted RDWR " 2733 "without CONFIG_QUOTA"); 2734 return 0; 2735 } 2736 if (ext4_has_feature_project(sb) && !readonly) { 2737 ext4_msg(sb, KERN_ERR, 2738 "Filesystem with project quota feature cannot be mounted RDWR " 2739 "without CONFIG_QUOTA"); 2740 return 0; 2741 } 2742 #endif /* CONFIG_QUOTA */ 2743 return 1; 2744 } 2745 2746 /* 2747 * This function is called once a day if we have errors logged 2748 * on the file system 2749 */ 2750 static void print_daily_error_info(unsigned long arg) 2751 { 2752 struct super_block *sb = (struct super_block *) arg; 2753 struct ext4_sb_info *sbi; 2754 struct ext4_super_block *es; 2755 2756 sbi = EXT4_SB(sb); 2757 es = sbi->s_es; 2758 2759 if (es->s_error_count) 2760 /* fsck newer than v1.41.13 is needed to clean this condition. */ 2761 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", 2762 le32_to_cpu(es->s_error_count)); 2763 if (es->s_first_error_time) { 2764 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d", 2765 sb->s_id, le32_to_cpu(es->s_first_error_time), 2766 (int) sizeof(es->s_first_error_func), 2767 es->s_first_error_func, 2768 le32_to_cpu(es->s_first_error_line)); 2769 if (es->s_first_error_ino) 2770 printk(KERN_CONT ": inode %u", 2771 le32_to_cpu(es->s_first_error_ino)); 2772 if (es->s_first_error_block) 2773 printk(KERN_CONT ": block %llu", (unsigned long long) 2774 le64_to_cpu(es->s_first_error_block)); 2775 printk(KERN_CONT "\n"); 2776 } 2777 if (es->s_last_error_time) { 2778 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d", 2779 sb->s_id, le32_to_cpu(es->s_last_error_time), 2780 (int) sizeof(es->s_last_error_func), 2781 es->s_last_error_func, 2782 le32_to_cpu(es->s_last_error_line)); 2783 if (es->s_last_error_ino) 2784 printk(KERN_CONT ": inode %u", 2785 le32_to_cpu(es->s_last_error_ino)); 2786 if (es->s_last_error_block) 2787 printk(KERN_CONT ": block %llu", (unsigned long long) 2788 le64_to_cpu(es->s_last_error_block)); 2789 printk(KERN_CONT "\n"); 2790 } 2791 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2792 } 2793 2794 /* Find next suitable group and run ext4_init_inode_table */ 2795 static int ext4_run_li_request(struct ext4_li_request *elr) 2796 { 2797 struct ext4_group_desc *gdp = NULL; 2798 ext4_group_t group, ngroups; 2799 struct super_block *sb; 2800 unsigned long timeout = 0; 2801 int ret = 0; 2802 2803 sb = elr->lr_super; 2804 ngroups = EXT4_SB(sb)->s_groups_count; 2805 2806 for (group = elr->lr_next_group; group < ngroups; group++) { 2807 gdp = ext4_get_group_desc(sb, group, NULL); 2808 if (!gdp) { 2809 ret = 1; 2810 break; 2811 } 2812 2813 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2814 break; 2815 } 2816 2817 if (group >= ngroups) 2818 ret = 1; 2819 2820 if (!ret) { 2821 timeout = jiffies; 2822 ret = ext4_init_inode_table(sb, group, 2823 elr->lr_timeout ? 0 : 1); 2824 if (elr->lr_timeout == 0) { 2825 timeout = (jiffies - timeout) * 2826 elr->lr_sbi->s_li_wait_mult; 2827 elr->lr_timeout = timeout; 2828 } 2829 elr->lr_next_sched = jiffies + elr->lr_timeout; 2830 elr->lr_next_group = group + 1; 2831 } 2832 return ret; 2833 } 2834 2835 /* 2836 * Remove lr_request from the list_request and free the 2837 * request structure. Should be called with li_list_mtx held 2838 */ 2839 static void ext4_remove_li_request(struct ext4_li_request *elr) 2840 { 2841 struct ext4_sb_info *sbi; 2842 2843 if (!elr) 2844 return; 2845 2846 sbi = elr->lr_sbi; 2847 2848 list_del(&elr->lr_request); 2849 sbi->s_li_request = NULL; 2850 kfree(elr); 2851 } 2852 2853 static void ext4_unregister_li_request(struct super_block *sb) 2854 { 2855 mutex_lock(&ext4_li_mtx); 2856 if (!ext4_li_info) { 2857 mutex_unlock(&ext4_li_mtx); 2858 return; 2859 } 2860 2861 mutex_lock(&ext4_li_info->li_list_mtx); 2862 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2863 mutex_unlock(&ext4_li_info->li_list_mtx); 2864 mutex_unlock(&ext4_li_mtx); 2865 } 2866 2867 static struct task_struct *ext4_lazyinit_task; 2868 2869 /* 2870 * This is the function where ext4lazyinit thread lives. It walks 2871 * through the request list searching for next scheduled filesystem. 2872 * When such a fs is found, run the lazy initialization request 2873 * (ext4_rn_li_request) and keep track of the time spend in this 2874 * function. Based on that time we compute next schedule time of 2875 * the request. When walking through the list is complete, compute 2876 * next waking time and put itself into sleep. 2877 */ 2878 static int ext4_lazyinit_thread(void *arg) 2879 { 2880 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2881 struct list_head *pos, *n; 2882 struct ext4_li_request *elr; 2883 unsigned long next_wakeup, cur; 2884 2885 BUG_ON(NULL == eli); 2886 2887 cont_thread: 2888 while (true) { 2889 next_wakeup = MAX_JIFFY_OFFSET; 2890 2891 mutex_lock(&eli->li_list_mtx); 2892 if (list_empty(&eli->li_request_list)) { 2893 mutex_unlock(&eli->li_list_mtx); 2894 goto exit_thread; 2895 } 2896 list_for_each_safe(pos, n, &eli->li_request_list) { 2897 int err = 0; 2898 int progress = 0; 2899 elr = list_entry(pos, struct ext4_li_request, 2900 lr_request); 2901 2902 if (time_before(jiffies, elr->lr_next_sched)) { 2903 if (time_before(elr->lr_next_sched, next_wakeup)) 2904 next_wakeup = elr->lr_next_sched; 2905 continue; 2906 } 2907 if (down_read_trylock(&elr->lr_super->s_umount)) { 2908 if (sb_start_write_trylock(elr->lr_super)) { 2909 progress = 1; 2910 /* 2911 * We hold sb->s_umount, sb can not 2912 * be removed from the list, it is 2913 * now safe to drop li_list_mtx 2914 */ 2915 mutex_unlock(&eli->li_list_mtx); 2916 err = ext4_run_li_request(elr); 2917 sb_end_write(elr->lr_super); 2918 mutex_lock(&eli->li_list_mtx); 2919 n = pos->next; 2920 } 2921 up_read((&elr->lr_super->s_umount)); 2922 } 2923 /* error, remove the lazy_init job */ 2924 if (err) { 2925 ext4_remove_li_request(elr); 2926 continue; 2927 } 2928 if (!progress) { 2929 elr->lr_next_sched = jiffies + 2930 (prandom_u32() 2931 % (EXT4_DEF_LI_MAX_START_DELAY * HZ)); 2932 } 2933 if (time_before(elr->lr_next_sched, next_wakeup)) 2934 next_wakeup = elr->lr_next_sched; 2935 } 2936 mutex_unlock(&eli->li_list_mtx); 2937 2938 try_to_freeze(); 2939 2940 cur = jiffies; 2941 if ((time_after_eq(cur, next_wakeup)) || 2942 (MAX_JIFFY_OFFSET == next_wakeup)) { 2943 cond_resched(); 2944 continue; 2945 } 2946 2947 schedule_timeout_interruptible(next_wakeup - cur); 2948 2949 if (kthread_should_stop()) { 2950 ext4_clear_request_list(); 2951 goto exit_thread; 2952 } 2953 } 2954 2955 exit_thread: 2956 /* 2957 * It looks like the request list is empty, but we need 2958 * to check it under the li_list_mtx lock, to prevent any 2959 * additions into it, and of course we should lock ext4_li_mtx 2960 * to atomically free the list and ext4_li_info, because at 2961 * this point another ext4 filesystem could be registering 2962 * new one. 2963 */ 2964 mutex_lock(&ext4_li_mtx); 2965 mutex_lock(&eli->li_list_mtx); 2966 if (!list_empty(&eli->li_request_list)) { 2967 mutex_unlock(&eli->li_list_mtx); 2968 mutex_unlock(&ext4_li_mtx); 2969 goto cont_thread; 2970 } 2971 mutex_unlock(&eli->li_list_mtx); 2972 kfree(ext4_li_info); 2973 ext4_li_info = NULL; 2974 mutex_unlock(&ext4_li_mtx); 2975 2976 return 0; 2977 } 2978 2979 static void ext4_clear_request_list(void) 2980 { 2981 struct list_head *pos, *n; 2982 struct ext4_li_request *elr; 2983 2984 mutex_lock(&ext4_li_info->li_list_mtx); 2985 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 2986 elr = list_entry(pos, struct ext4_li_request, 2987 lr_request); 2988 ext4_remove_li_request(elr); 2989 } 2990 mutex_unlock(&ext4_li_info->li_list_mtx); 2991 } 2992 2993 static int ext4_run_lazyinit_thread(void) 2994 { 2995 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 2996 ext4_li_info, "ext4lazyinit"); 2997 if (IS_ERR(ext4_lazyinit_task)) { 2998 int err = PTR_ERR(ext4_lazyinit_task); 2999 ext4_clear_request_list(); 3000 kfree(ext4_li_info); 3001 ext4_li_info = NULL; 3002 printk(KERN_CRIT "EXT4-fs: error %d creating inode table " 3003 "initialization thread\n", 3004 err); 3005 return err; 3006 } 3007 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 3008 return 0; 3009 } 3010 3011 /* 3012 * Check whether it make sense to run itable init. thread or not. 3013 * If there is at least one uninitialized inode table, return 3014 * corresponding group number, else the loop goes through all 3015 * groups and return total number of groups. 3016 */ 3017 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 3018 { 3019 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 3020 struct ext4_group_desc *gdp = NULL; 3021 3022 for (group = 0; group < ngroups; group++) { 3023 gdp = ext4_get_group_desc(sb, group, NULL); 3024 if (!gdp) 3025 continue; 3026 3027 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 3028 break; 3029 } 3030 3031 return group; 3032 } 3033 3034 static int ext4_li_info_new(void) 3035 { 3036 struct ext4_lazy_init *eli = NULL; 3037 3038 eli = kzalloc(sizeof(*eli), GFP_KERNEL); 3039 if (!eli) 3040 return -ENOMEM; 3041 3042 INIT_LIST_HEAD(&eli->li_request_list); 3043 mutex_init(&eli->li_list_mtx); 3044 3045 eli->li_state |= EXT4_LAZYINIT_QUIT; 3046 3047 ext4_li_info = eli; 3048 3049 return 0; 3050 } 3051 3052 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 3053 ext4_group_t start) 3054 { 3055 struct ext4_sb_info *sbi = EXT4_SB(sb); 3056 struct ext4_li_request *elr; 3057 3058 elr = kzalloc(sizeof(*elr), GFP_KERNEL); 3059 if (!elr) 3060 return NULL; 3061 3062 elr->lr_super = sb; 3063 elr->lr_sbi = sbi; 3064 elr->lr_next_group = start; 3065 3066 /* 3067 * Randomize first schedule time of the request to 3068 * spread the inode table initialization requests 3069 * better. 3070 */ 3071 elr->lr_next_sched = jiffies + (prandom_u32() % 3072 (EXT4_DEF_LI_MAX_START_DELAY * HZ)); 3073 return elr; 3074 } 3075 3076 int ext4_register_li_request(struct super_block *sb, 3077 ext4_group_t first_not_zeroed) 3078 { 3079 struct ext4_sb_info *sbi = EXT4_SB(sb); 3080 struct ext4_li_request *elr = NULL; 3081 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3082 int ret = 0; 3083 3084 mutex_lock(&ext4_li_mtx); 3085 if (sbi->s_li_request != NULL) { 3086 /* 3087 * Reset timeout so it can be computed again, because 3088 * s_li_wait_mult might have changed. 3089 */ 3090 sbi->s_li_request->lr_timeout = 0; 3091 goto out; 3092 } 3093 3094 if (first_not_zeroed == ngroups || 3095 (sb->s_flags & MS_RDONLY) || 3096 !test_opt(sb, INIT_INODE_TABLE)) 3097 goto out; 3098 3099 elr = ext4_li_request_new(sb, first_not_zeroed); 3100 if (!elr) { 3101 ret = -ENOMEM; 3102 goto out; 3103 } 3104 3105 if (NULL == ext4_li_info) { 3106 ret = ext4_li_info_new(); 3107 if (ret) 3108 goto out; 3109 } 3110 3111 mutex_lock(&ext4_li_info->li_list_mtx); 3112 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 3113 mutex_unlock(&ext4_li_info->li_list_mtx); 3114 3115 sbi->s_li_request = elr; 3116 /* 3117 * set elr to NULL here since it has been inserted to 3118 * the request_list and the removal and free of it is 3119 * handled by ext4_clear_request_list from now on. 3120 */ 3121 elr = NULL; 3122 3123 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 3124 ret = ext4_run_lazyinit_thread(); 3125 if (ret) 3126 goto out; 3127 } 3128 out: 3129 mutex_unlock(&ext4_li_mtx); 3130 if (ret) 3131 kfree(elr); 3132 return ret; 3133 } 3134 3135 /* 3136 * We do not need to lock anything since this is called on 3137 * module unload. 3138 */ 3139 static void ext4_destroy_lazyinit_thread(void) 3140 { 3141 /* 3142 * If thread exited earlier 3143 * there's nothing to be done. 3144 */ 3145 if (!ext4_li_info || !ext4_lazyinit_task) 3146 return; 3147 3148 kthread_stop(ext4_lazyinit_task); 3149 } 3150 3151 static int set_journal_csum_feature_set(struct super_block *sb) 3152 { 3153 int ret = 1; 3154 int compat, incompat; 3155 struct ext4_sb_info *sbi = EXT4_SB(sb); 3156 3157 if (ext4_has_metadata_csum(sb)) { 3158 /* journal checksum v3 */ 3159 compat = 0; 3160 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; 3161 } else { 3162 /* journal checksum v1 */ 3163 compat = JBD2_FEATURE_COMPAT_CHECKSUM; 3164 incompat = 0; 3165 } 3166 3167 jbd2_journal_clear_features(sbi->s_journal, 3168 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3169 JBD2_FEATURE_INCOMPAT_CSUM_V3 | 3170 JBD2_FEATURE_INCOMPAT_CSUM_V2); 3171 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3172 ret = jbd2_journal_set_features(sbi->s_journal, 3173 compat, 0, 3174 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 3175 incompat); 3176 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 3177 ret = jbd2_journal_set_features(sbi->s_journal, 3178 compat, 0, 3179 incompat); 3180 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3181 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3182 } else { 3183 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3184 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3185 } 3186 3187 return ret; 3188 } 3189 3190 /* 3191 * Note: calculating the overhead so we can be compatible with 3192 * historical BSD practice is quite difficult in the face of 3193 * clusters/bigalloc. This is because multiple metadata blocks from 3194 * different block group can end up in the same allocation cluster. 3195 * Calculating the exact overhead in the face of clustered allocation 3196 * requires either O(all block bitmaps) in memory or O(number of block 3197 * groups**2) in time. We will still calculate the superblock for 3198 * older file systems --- and if we come across with a bigalloc file 3199 * system with zero in s_overhead_clusters the estimate will be close to 3200 * correct especially for very large cluster sizes --- but for newer 3201 * file systems, it's better to calculate this figure once at mkfs 3202 * time, and store it in the superblock. If the superblock value is 3203 * present (even for non-bigalloc file systems), we will use it. 3204 */ 3205 static int count_overhead(struct super_block *sb, ext4_group_t grp, 3206 char *buf) 3207 { 3208 struct ext4_sb_info *sbi = EXT4_SB(sb); 3209 struct ext4_group_desc *gdp; 3210 ext4_fsblk_t first_block, last_block, b; 3211 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3212 int s, j, count = 0; 3213 3214 if (!ext4_has_feature_bigalloc(sb)) 3215 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + 3216 sbi->s_itb_per_group + 2); 3217 3218 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + 3219 (grp * EXT4_BLOCKS_PER_GROUP(sb)); 3220 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; 3221 for (i = 0; i < ngroups; i++) { 3222 gdp = ext4_get_group_desc(sb, i, NULL); 3223 b = ext4_block_bitmap(sb, gdp); 3224 if (b >= first_block && b <= last_block) { 3225 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3226 count++; 3227 } 3228 b = ext4_inode_bitmap(sb, gdp); 3229 if (b >= first_block && b <= last_block) { 3230 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3231 count++; 3232 } 3233 b = ext4_inode_table(sb, gdp); 3234 if (b >= first_block && b + sbi->s_itb_per_group <= last_block) 3235 for (j = 0; j < sbi->s_itb_per_group; j++, b++) { 3236 int c = EXT4_B2C(sbi, b - first_block); 3237 ext4_set_bit(c, buf); 3238 count++; 3239 } 3240 if (i != grp) 3241 continue; 3242 s = 0; 3243 if (ext4_bg_has_super(sb, grp)) { 3244 ext4_set_bit(s++, buf); 3245 count++; 3246 } 3247 j = ext4_bg_num_gdb(sb, grp); 3248 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) { 3249 ext4_error(sb, "Invalid number of block group " 3250 "descriptor blocks: %d", j); 3251 j = EXT4_BLOCKS_PER_GROUP(sb) - s; 3252 } 3253 count += j; 3254 for (; j > 0; j--) 3255 ext4_set_bit(EXT4_B2C(sbi, s++), buf); 3256 } 3257 if (!count) 3258 return 0; 3259 return EXT4_CLUSTERS_PER_GROUP(sb) - 3260 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); 3261 } 3262 3263 /* 3264 * Compute the overhead and stash it in sbi->s_overhead 3265 */ 3266 int ext4_calculate_overhead(struct super_block *sb) 3267 { 3268 struct ext4_sb_info *sbi = EXT4_SB(sb); 3269 struct ext4_super_block *es = sbi->s_es; 3270 struct inode *j_inode; 3271 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum); 3272 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3273 ext4_fsblk_t overhead = 0; 3274 char *buf = (char *) get_zeroed_page(GFP_NOFS); 3275 3276 if (!buf) 3277 return -ENOMEM; 3278 3279 /* 3280 * Compute the overhead (FS structures). This is constant 3281 * for a given filesystem unless the number of block groups 3282 * changes so we cache the previous value until it does. 3283 */ 3284 3285 /* 3286 * All of the blocks before first_data_block are overhead 3287 */ 3288 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 3289 3290 /* 3291 * Add the overhead found in each block group 3292 */ 3293 for (i = 0; i < ngroups; i++) { 3294 int blks; 3295 3296 blks = count_overhead(sb, i, buf); 3297 overhead += blks; 3298 if (blks) 3299 memset(buf, 0, PAGE_SIZE); 3300 cond_resched(); 3301 } 3302 3303 /* 3304 * Add the internal journal blocks whether the journal has been 3305 * loaded or not 3306 */ 3307 if (sbi->s_journal && !sbi->journal_bdev) 3308 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); 3309 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) { 3310 j_inode = ext4_get_journal_inode(sb, j_inum); 3311 if (j_inode) { 3312 j_blocks = j_inode->i_size >> sb->s_blocksize_bits; 3313 overhead += EXT4_NUM_B2C(sbi, j_blocks); 3314 iput(j_inode); 3315 } else { 3316 ext4_msg(sb, KERN_ERR, "can't get journal size"); 3317 } 3318 } 3319 sbi->s_overhead = overhead; 3320 smp_wmb(); 3321 free_page((unsigned long) buf); 3322 return 0; 3323 } 3324 3325 static void ext4_set_resv_clusters(struct super_block *sb) 3326 { 3327 ext4_fsblk_t resv_clusters; 3328 struct ext4_sb_info *sbi = EXT4_SB(sb); 3329 3330 /* 3331 * There's no need to reserve anything when we aren't using extents. 3332 * The space estimates are exact, there are no unwritten extents, 3333 * hole punching doesn't need new metadata... This is needed especially 3334 * to keep ext2/3 backward compatibility. 3335 */ 3336 if (!ext4_has_feature_extents(sb)) 3337 return; 3338 /* 3339 * By default we reserve 2% or 4096 clusters, whichever is smaller. 3340 * This should cover the situations where we can not afford to run 3341 * out of space like for example punch hole, or converting 3342 * unwritten extents in delalloc path. In most cases such 3343 * allocation would require 1, or 2 blocks, higher numbers are 3344 * very rare. 3345 */ 3346 resv_clusters = (ext4_blocks_count(sbi->s_es) >> 3347 sbi->s_cluster_bits); 3348 3349 do_div(resv_clusters, 50); 3350 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); 3351 3352 atomic64_set(&sbi->s_resv_clusters, resv_clusters); 3353 } 3354 3355 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3356 { 3357 char *orig_data = kstrdup(data, GFP_KERNEL); 3358 struct buffer_head *bh; 3359 struct ext4_super_block *es = NULL; 3360 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3361 ext4_fsblk_t block; 3362 ext4_fsblk_t sb_block = get_sb_block(&data); 3363 ext4_fsblk_t logical_sb_block; 3364 unsigned long offset = 0; 3365 unsigned long journal_devnum = 0; 3366 unsigned long def_mount_opts; 3367 struct inode *root; 3368 const char *descr; 3369 int ret = -ENOMEM; 3370 int blocksize, clustersize; 3371 unsigned int db_count; 3372 unsigned int i; 3373 int needs_recovery, has_huge_files, has_bigalloc; 3374 __u64 blocks_count; 3375 int err = 0; 3376 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3377 ext4_group_t first_not_zeroed; 3378 3379 if ((data && !orig_data) || !sbi) 3380 goto out_free_base; 3381 3382 sbi->s_blockgroup_lock = 3383 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3384 if (!sbi->s_blockgroup_lock) 3385 goto out_free_base; 3386 3387 sb->s_fs_info = sbi; 3388 sbi->s_sb = sb; 3389 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3390 sbi->s_sb_block = sb_block; 3391 if (sb->s_bdev->bd_part) 3392 sbi->s_sectors_written_start = 3393 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3394 3395 /* Cleanup superblock name */ 3396 strreplace(sb->s_id, '/', '!'); 3397 3398 /* -EINVAL is default */ 3399 ret = -EINVAL; 3400 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3401 if (!blocksize) { 3402 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3403 goto out_fail; 3404 } 3405 3406 /* 3407 * The ext4 superblock will not be buffer aligned for other than 1kB 3408 * block sizes. We need to calculate the offset from buffer start. 3409 */ 3410 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 3411 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3412 offset = do_div(logical_sb_block, blocksize); 3413 } else { 3414 logical_sb_block = sb_block; 3415 } 3416 3417 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) { 3418 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3419 goto out_fail; 3420 } 3421 /* 3422 * Note: s_es must be initialized as soon as possible because 3423 * some ext4 macro-instructions depend on its value 3424 */ 3425 es = (struct ext4_super_block *) (bh->b_data + offset); 3426 sbi->s_es = es; 3427 sb->s_magic = le16_to_cpu(es->s_magic); 3428 if (sb->s_magic != EXT4_SUPER_MAGIC) 3429 goto cantfind_ext4; 3430 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3431 3432 /* Warn if metadata_csum and gdt_csum are both set. */ 3433 if (ext4_has_feature_metadata_csum(sb) && 3434 ext4_has_feature_gdt_csum(sb)) 3435 ext4_warning(sb, "metadata_csum and uninit_bg are " 3436 "redundant flags; please run fsck."); 3437 3438 /* Check for a known checksum algorithm */ 3439 if (!ext4_verify_csum_type(sb, es)) { 3440 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3441 "unknown checksum algorithm."); 3442 silent = 1; 3443 goto cantfind_ext4; 3444 } 3445 3446 /* Load the checksum driver */ 3447 if (ext4_has_feature_metadata_csum(sb)) { 3448 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 3449 if (IS_ERR(sbi->s_chksum_driver)) { 3450 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); 3451 ret = PTR_ERR(sbi->s_chksum_driver); 3452 sbi->s_chksum_driver = NULL; 3453 goto failed_mount; 3454 } 3455 } 3456 3457 /* Check superblock checksum */ 3458 if (!ext4_superblock_csum_verify(sb, es)) { 3459 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3460 "invalid superblock checksum. Run e2fsck?"); 3461 silent = 1; 3462 ret = -EFSBADCRC; 3463 goto cantfind_ext4; 3464 } 3465 3466 /* Precompute checksum seed for all metadata */ 3467 if (ext4_has_feature_csum_seed(sb)) 3468 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed); 3469 else if (ext4_has_metadata_csum(sb)) 3470 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, 3471 sizeof(es->s_uuid)); 3472 3473 /* Set defaults before we parse the mount options */ 3474 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3475 set_opt(sb, INIT_INODE_TABLE); 3476 if (def_mount_opts & EXT4_DEFM_DEBUG) 3477 set_opt(sb, DEBUG); 3478 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 3479 set_opt(sb, GRPID); 3480 if (def_mount_opts & EXT4_DEFM_UID16) 3481 set_opt(sb, NO_UID32); 3482 /* xattr user namespace & acls are now defaulted on */ 3483 set_opt(sb, XATTR_USER); 3484 #ifdef CONFIG_EXT4_FS_POSIX_ACL 3485 set_opt(sb, POSIX_ACL); 3486 #endif 3487 /* don't forget to enable journal_csum when metadata_csum is enabled. */ 3488 if (ext4_has_metadata_csum(sb)) 3489 set_opt(sb, JOURNAL_CHECKSUM); 3490 3491 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3492 set_opt(sb, JOURNAL_DATA); 3493 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3494 set_opt(sb, ORDERED_DATA); 3495 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3496 set_opt(sb, WRITEBACK_DATA); 3497 3498 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3499 set_opt(sb, ERRORS_PANIC); 3500 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3501 set_opt(sb, ERRORS_CONT); 3502 else 3503 set_opt(sb, ERRORS_RO); 3504 /* block_validity enabled by default; disable with noblock_validity */ 3505 set_opt(sb, BLOCK_VALIDITY); 3506 if (def_mount_opts & EXT4_DEFM_DISCARD) 3507 set_opt(sb, DISCARD); 3508 3509 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 3510 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 3511 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 3512 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 3513 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3514 3515 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3516 set_opt(sb, BARRIER); 3517 3518 /* 3519 * enable delayed allocation by default 3520 * Use -o nodelalloc to turn it off 3521 */ 3522 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && 3523 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3524 set_opt(sb, DELALLOC); 3525 3526 /* 3527 * set default s_li_wait_mult for lazyinit, for the case there is 3528 * no mount option specified. 3529 */ 3530 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 3531 3532 if (sbi->s_es->s_mount_opts[0]) { 3533 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts, 3534 sizeof(sbi->s_es->s_mount_opts), 3535 GFP_KERNEL); 3536 if (!s_mount_opts) 3537 goto failed_mount; 3538 if (!parse_options(s_mount_opts, sb, &journal_devnum, 3539 &journal_ioprio, 0)) { 3540 ext4_msg(sb, KERN_WARNING, 3541 "failed to parse options in superblock: %s", 3542 s_mount_opts); 3543 } 3544 kfree(s_mount_opts); 3545 } 3546 sbi->s_def_mount_opt = sbi->s_mount_opt; 3547 if (!parse_options((char *) data, sb, &journal_devnum, 3548 &journal_ioprio, 0)) 3549 goto failed_mount; 3550 3551 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3552 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " 3553 "with data=journal disables delayed " 3554 "allocation and O_DIRECT support!\n"); 3555 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 3556 ext4_msg(sb, KERN_ERR, "can't mount with " 3557 "both data=journal and delalloc"); 3558 goto failed_mount; 3559 } 3560 if (test_opt(sb, DIOREAD_NOLOCK)) { 3561 ext4_msg(sb, KERN_ERR, "can't mount with " 3562 "both data=journal and dioread_nolock"); 3563 goto failed_mount; 3564 } 3565 if (test_opt(sb, DAX)) { 3566 ext4_msg(sb, KERN_ERR, "can't mount with " 3567 "both data=journal and dax"); 3568 goto failed_mount; 3569 } 3570 if (ext4_has_feature_encrypt(sb)) { 3571 ext4_msg(sb, KERN_WARNING, 3572 "encrypted files will use data=ordered " 3573 "instead of data journaling mode"); 3574 } 3575 if (test_opt(sb, DELALLOC)) 3576 clear_opt(sb, DELALLOC); 3577 } else { 3578 sb->s_iflags |= SB_I_CGROUPWB; 3579 } 3580 3581 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3582 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3583 3584 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3585 (ext4_has_compat_features(sb) || 3586 ext4_has_ro_compat_features(sb) || 3587 ext4_has_incompat_features(sb))) 3588 ext4_msg(sb, KERN_WARNING, 3589 "feature flags set on rev 0 fs, " 3590 "running e2fsck is recommended"); 3591 3592 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { 3593 set_opt2(sb, HURD_COMPAT); 3594 if (ext4_has_feature_64bit(sb)) { 3595 ext4_msg(sb, KERN_ERR, 3596 "The Hurd can't support 64-bit file systems"); 3597 goto failed_mount; 3598 } 3599 } 3600 3601 if (IS_EXT2_SB(sb)) { 3602 if (ext2_feature_set_ok(sb)) 3603 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 3604 "using the ext4 subsystem"); 3605 else { 3606 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 3607 "to feature incompatibilities"); 3608 goto failed_mount; 3609 } 3610 } 3611 3612 if (IS_EXT3_SB(sb)) { 3613 if (ext3_feature_set_ok(sb)) 3614 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 3615 "using the ext4 subsystem"); 3616 else { 3617 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 3618 "to feature incompatibilities"); 3619 goto failed_mount; 3620 } 3621 } 3622 3623 /* 3624 * Check feature flags regardless of the revision level, since we 3625 * previously didn't change the revision level when setting the flags, 3626 * so there is a chance incompat flags are set on a rev 0 filesystem. 3627 */ 3628 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3629 goto failed_mount; 3630 3631 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 3632 if (blocksize < EXT4_MIN_BLOCK_SIZE || 3633 blocksize > EXT4_MAX_BLOCK_SIZE) { 3634 ext4_msg(sb, KERN_ERR, 3635 "Unsupported filesystem blocksize %d (%d log_block_size)", 3636 blocksize, le32_to_cpu(es->s_log_block_size)); 3637 goto failed_mount; 3638 } 3639 if (le32_to_cpu(es->s_log_block_size) > 3640 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { 3641 ext4_msg(sb, KERN_ERR, 3642 "Invalid log block size: %u", 3643 le32_to_cpu(es->s_log_block_size)); 3644 goto failed_mount; 3645 } 3646 3647 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) { 3648 ext4_msg(sb, KERN_ERR, 3649 "Number of reserved GDT blocks insanely large: %d", 3650 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks)); 3651 goto failed_mount; 3652 } 3653 3654 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { 3655 err = bdev_dax_supported(sb, blocksize); 3656 if (err) 3657 goto failed_mount; 3658 } 3659 3660 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { 3661 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", 3662 es->s_encryption_level); 3663 goto failed_mount; 3664 } 3665 3666 if (sb->s_blocksize != blocksize) { 3667 /* Validate the filesystem blocksize */ 3668 if (!sb_set_blocksize(sb, blocksize)) { 3669 ext4_msg(sb, KERN_ERR, "bad block size %d", 3670 blocksize); 3671 goto failed_mount; 3672 } 3673 3674 brelse(bh); 3675 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3676 offset = do_div(logical_sb_block, blocksize); 3677 bh = sb_bread_unmovable(sb, logical_sb_block); 3678 if (!bh) { 3679 ext4_msg(sb, KERN_ERR, 3680 "Can't read superblock on 2nd try"); 3681 goto failed_mount; 3682 } 3683 es = (struct ext4_super_block *)(bh->b_data + offset); 3684 sbi->s_es = es; 3685 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3686 ext4_msg(sb, KERN_ERR, 3687 "Magic mismatch, very weird!"); 3688 goto failed_mount; 3689 } 3690 } 3691 3692 has_huge_files = ext4_has_feature_huge_file(sb); 3693 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3694 has_huge_files); 3695 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3696 3697 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3698 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3699 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3700 } else { 3701 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3702 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3703 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 3704 (!is_power_of_2(sbi->s_inode_size)) || 3705 (sbi->s_inode_size > blocksize)) { 3706 ext4_msg(sb, KERN_ERR, 3707 "unsupported inode size: %d", 3708 sbi->s_inode_size); 3709 goto failed_mount; 3710 } 3711 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3712 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3713 } 3714 3715 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 3716 if (ext4_has_feature_64bit(sb)) { 3717 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 3718 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3719 !is_power_of_2(sbi->s_desc_size)) { 3720 ext4_msg(sb, KERN_ERR, 3721 "unsupported descriptor size %lu", 3722 sbi->s_desc_size); 3723 goto failed_mount; 3724 } 3725 } else 3726 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 3727 3728 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3729 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3730 3731 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3732 if (sbi->s_inodes_per_block == 0) 3733 goto cantfind_ext4; 3734 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || 3735 sbi->s_inodes_per_group > blocksize * 8) { 3736 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n", 3737 sbi->s_blocks_per_group); 3738 goto failed_mount; 3739 } 3740 sbi->s_itb_per_group = sbi->s_inodes_per_group / 3741 sbi->s_inodes_per_block; 3742 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3743 sbi->s_sbh = bh; 3744 sbi->s_mount_state = le16_to_cpu(es->s_state); 3745 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3746 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 3747 3748 for (i = 0; i < 4; i++) 3749 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3750 sbi->s_def_hash_version = es->s_def_hash_version; 3751 if (ext4_has_feature_dir_index(sb)) { 3752 i = le32_to_cpu(es->s_flags); 3753 if (i & EXT2_FLAGS_UNSIGNED_HASH) 3754 sbi->s_hash_unsigned = 3; 3755 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3756 #ifdef __CHAR_UNSIGNED__ 3757 if (!(sb->s_flags & MS_RDONLY)) 3758 es->s_flags |= 3759 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3760 sbi->s_hash_unsigned = 3; 3761 #else 3762 if (!(sb->s_flags & MS_RDONLY)) 3763 es->s_flags |= 3764 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3765 #endif 3766 } 3767 } 3768 3769 /* Handle clustersize */ 3770 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 3771 has_bigalloc = ext4_has_feature_bigalloc(sb); 3772 if (has_bigalloc) { 3773 if (clustersize < blocksize) { 3774 ext4_msg(sb, KERN_ERR, 3775 "cluster size (%d) smaller than " 3776 "block size (%d)", clustersize, blocksize); 3777 goto failed_mount; 3778 } 3779 if (le32_to_cpu(es->s_log_cluster_size) > 3780 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { 3781 ext4_msg(sb, KERN_ERR, 3782 "Invalid log cluster size: %u", 3783 le32_to_cpu(es->s_log_cluster_size)); 3784 goto failed_mount; 3785 } 3786 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 3787 le32_to_cpu(es->s_log_block_size); 3788 sbi->s_clusters_per_group = 3789 le32_to_cpu(es->s_clusters_per_group); 3790 if (sbi->s_clusters_per_group > blocksize * 8) { 3791 ext4_msg(sb, KERN_ERR, 3792 "#clusters per group too big: %lu", 3793 sbi->s_clusters_per_group); 3794 goto failed_mount; 3795 } 3796 if (sbi->s_blocks_per_group != 3797 (sbi->s_clusters_per_group * (clustersize / blocksize))) { 3798 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " 3799 "clusters per group (%lu) inconsistent", 3800 sbi->s_blocks_per_group, 3801 sbi->s_clusters_per_group); 3802 goto failed_mount; 3803 } 3804 } else { 3805 if (clustersize != blocksize) { 3806 ext4_warning(sb, "fragment/cluster size (%d) != " 3807 "block size (%d)", clustersize, 3808 blocksize); 3809 clustersize = blocksize; 3810 } 3811 if (sbi->s_blocks_per_group > blocksize * 8) { 3812 ext4_msg(sb, KERN_ERR, 3813 "#blocks per group too big: %lu", 3814 sbi->s_blocks_per_group); 3815 goto failed_mount; 3816 } 3817 sbi->s_clusters_per_group = sbi->s_blocks_per_group; 3818 sbi->s_cluster_bits = 0; 3819 } 3820 sbi->s_cluster_ratio = clustersize / blocksize; 3821 3822 /* Do we have standard group size of clustersize * 8 blocks ? */ 3823 if (sbi->s_blocks_per_group == clustersize << 3) 3824 set_opt2(sb, STD_GROUP_SIZE); 3825 3826 /* 3827 * Test whether we have more sectors than will fit in sector_t, 3828 * and whether the max offset is addressable by the page cache. 3829 */ 3830 err = generic_check_addressable(sb->s_blocksize_bits, 3831 ext4_blocks_count(es)); 3832 if (err) { 3833 ext4_msg(sb, KERN_ERR, "filesystem" 3834 " too large to mount safely on this system"); 3835 if (sizeof(sector_t) < 8) 3836 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 3837 goto failed_mount; 3838 } 3839 3840 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3841 goto cantfind_ext4; 3842 3843 /* check blocks count against device size */ 3844 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 3845 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3846 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3847 "exceeds size of device (%llu blocks)", 3848 ext4_blocks_count(es), blocks_count); 3849 goto failed_mount; 3850 } 3851 3852 /* 3853 * It makes no sense for the first data block to be beyond the end 3854 * of the filesystem. 3855 */ 3856 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3857 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 3858 "block %u is beyond end of filesystem (%llu)", 3859 le32_to_cpu(es->s_first_data_block), 3860 ext4_blocks_count(es)); 3861 goto failed_mount; 3862 } 3863 blocks_count = (ext4_blocks_count(es) - 3864 le32_to_cpu(es->s_first_data_block) + 3865 EXT4_BLOCKS_PER_GROUP(sb) - 1); 3866 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 3867 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3868 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 3869 "(block count %llu, first data block %u, " 3870 "blocks per group %lu)", sbi->s_groups_count, 3871 ext4_blocks_count(es), 3872 le32_to_cpu(es->s_first_data_block), 3873 EXT4_BLOCKS_PER_GROUP(sb)); 3874 goto failed_mount; 3875 } 3876 sbi->s_groups_count = blocks_count; 3877 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3878 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3879 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3880 EXT4_DESC_PER_BLOCK(sb); 3881 if (ext4_has_feature_meta_bg(sb)) { 3882 if (le32_to_cpu(es->s_first_meta_bg) > db_count) { 3883 ext4_msg(sb, KERN_WARNING, 3884 "first meta block group too large: %u " 3885 "(group descriptor block count %u)", 3886 le32_to_cpu(es->s_first_meta_bg), db_count); 3887 goto failed_mount; 3888 } 3889 } 3890 sbi->s_group_desc = ext4_kvmalloc(db_count * 3891 sizeof(struct buffer_head *), 3892 GFP_KERNEL); 3893 if (sbi->s_group_desc == NULL) { 3894 ext4_msg(sb, KERN_ERR, "not enough memory"); 3895 ret = -ENOMEM; 3896 goto failed_mount; 3897 } 3898 3899 bgl_lock_init(sbi->s_blockgroup_lock); 3900 3901 for (i = 0; i < db_count; i++) { 3902 block = descriptor_loc(sb, logical_sb_block, i); 3903 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block); 3904 if (!sbi->s_group_desc[i]) { 3905 ext4_msg(sb, KERN_ERR, 3906 "can't read group descriptor %d", i); 3907 db_count = i; 3908 goto failed_mount2; 3909 } 3910 } 3911 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) { 3912 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3913 ret = -EFSCORRUPTED; 3914 goto failed_mount2; 3915 } 3916 3917 sbi->s_gdb_count = db_count; 3918 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3919 spin_lock_init(&sbi->s_next_gen_lock); 3920 3921 setup_timer(&sbi->s_err_report, print_daily_error_info, 3922 (unsigned long) sb); 3923 3924 /* Register extent status tree shrinker */ 3925 if (ext4_es_register_shrinker(sbi)) 3926 goto failed_mount3; 3927 3928 sbi->s_stripe = ext4_get_stripe_size(sbi); 3929 sbi->s_extent_max_zeroout_kb = 32; 3930 3931 /* 3932 * set up enough so that it can read an inode 3933 */ 3934 sb->s_op = &ext4_sops; 3935 sb->s_export_op = &ext4_export_ops; 3936 sb->s_xattr = ext4_xattr_handlers; 3937 sb->s_cop = &ext4_cryptops; 3938 #ifdef CONFIG_QUOTA 3939 sb->dq_op = &ext4_quota_operations; 3940 if (ext4_has_feature_quota(sb)) 3941 sb->s_qcop = &dquot_quotactl_sysfile_ops; 3942 else 3943 sb->s_qcop = &ext4_qctl_operations; 3944 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; 3945 #endif 3946 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3947 3948 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 3949 mutex_init(&sbi->s_orphan_lock); 3950 3951 sb->s_root = NULL; 3952 3953 needs_recovery = (es->s_last_orphan != 0 || 3954 ext4_has_feature_journal_needs_recovery(sb)); 3955 3956 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY)) 3957 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 3958 goto failed_mount3a; 3959 3960 /* 3961 * The first inode we look at is the journal inode. Don't try 3962 * root first: it may be modified in the journal! 3963 */ 3964 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { 3965 err = ext4_load_journal(sb, es, journal_devnum); 3966 if (err) 3967 goto failed_mount3a; 3968 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 3969 ext4_has_feature_journal_needs_recovery(sb)) { 3970 ext4_msg(sb, KERN_ERR, "required journal recovery " 3971 "suppressed and not mounted read-only"); 3972 goto failed_mount_wq; 3973 } else { 3974 /* Nojournal mode, all journal mount options are illegal */ 3975 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) { 3976 ext4_msg(sb, KERN_ERR, "can't mount with " 3977 "journal_checksum, fs mounted w/o journal"); 3978 goto failed_mount_wq; 3979 } 3980 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3981 ext4_msg(sb, KERN_ERR, "can't mount with " 3982 "journal_async_commit, fs mounted w/o journal"); 3983 goto failed_mount_wq; 3984 } 3985 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 3986 ext4_msg(sb, KERN_ERR, "can't mount with " 3987 "commit=%lu, fs mounted w/o journal", 3988 sbi->s_commit_interval / HZ); 3989 goto failed_mount_wq; 3990 } 3991 if (EXT4_MOUNT_DATA_FLAGS & 3992 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { 3993 ext4_msg(sb, KERN_ERR, "can't mount with " 3994 "data=, fs mounted w/o journal"); 3995 goto failed_mount_wq; 3996 } 3997 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM; 3998 clear_opt(sb, JOURNAL_CHECKSUM); 3999 clear_opt(sb, DATA_FLAGS); 4000 sbi->s_journal = NULL; 4001 needs_recovery = 0; 4002 goto no_journal; 4003 } 4004 4005 if (ext4_has_feature_64bit(sb) && 4006 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 4007 JBD2_FEATURE_INCOMPAT_64BIT)) { 4008 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 4009 goto failed_mount_wq; 4010 } 4011 4012 if (!set_journal_csum_feature_set(sb)) { 4013 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " 4014 "feature set"); 4015 goto failed_mount_wq; 4016 } 4017 4018 /* We have now updated the journal if required, so we can 4019 * validate the data journaling mode. */ 4020 switch (test_opt(sb, DATA_FLAGS)) { 4021 case 0: 4022 /* No mode set, assume a default based on the journal 4023 * capabilities: ORDERED_DATA if the journal can 4024 * cope, else JOURNAL_DATA 4025 */ 4026 if (jbd2_journal_check_available_features 4027 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 4028 set_opt(sb, ORDERED_DATA); 4029 else 4030 set_opt(sb, JOURNAL_DATA); 4031 break; 4032 4033 case EXT4_MOUNT_ORDERED_DATA: 4034 case EXT4_MOUNT_WRITEBACK_DATA: 4035 if (!jbd2_journal_check_available_features 4036 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 4037 ext4_msg(sb, KERN_ERR, "Journal does not support " 4038 "requested data journaling mode"); 4039 goto failed_mount_wq; 4040 } 4041 default: 4042 break; 4043 } 4044 4045 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && 4046 test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 4047 ext4_msg(sb, KERN_ERR, "can't mount with " 4048 "journal_async_commit in data=ordered mode"); 4049 goto failed_mount_wq; 4050 } 4051 4052 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4053 4054 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; 4055 4056 no_journal: 4057 sbi->s_mb_cache = ext4_xattr_create_cache(); 4058 if (!sbi->s_mb_cache) { 4059 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache"); 4060 goto failed_mount_wq; 4061 } 4062 4063 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) && 4064 (blocksize != PAGE_SIZE)) { 4065 ext4_msg(sb, KERN_ERR, 4066 "Unsupported blocksize for fs encryption"); 4067 goto failed_mount_wq; 4068 } 4069 4070 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) && 4071 !ext4_has_feature_encrypt(sb)) { 4072 ext4_set_feature_encrypt(sb); 4073 ext4_commit_super(sb, 1); 4074 } 4075 4076 /* 4077 * Get the # of file system overhead blocks from the 4078 * superblock if present. 4079 */ 4080 if (es->s_overhead_clusters) 4081 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); 4082 else { 4083 err = ext4_calculate_overhead(sb); 4084 if (err) 4085 goto failed_mount_wq; 4086 } 4087 4088 /* 4089 * The maximum number of concurrent works can be high and 4090 * concurrency isn't really necessary. Limit it to 1. 4091 */ 4092 EXT4_SB(sb)->rsv_conversion_wq = 4093 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 4094 if (!EXT4_SB(sb)->rsv_conversion_wq) { 4095 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); 4096 ret = -ENOMEM; 4097 goto failed_mount4; 4098 } 4099 4100 /* 4101 * The jbd2_journal_load will have done any necessary log recovery, 4102 * so we can safely mount the rest of the filesystem now. 4103 */ 4104 4105 root = ext4_iget(sb, EXT4_ROOT_INO); 4106 if (IS_ERR(root)) { 4107 ext4_msg(sb, KERN_ERR, "get root inode failed"); 4108 ret = PTR_ERR(root); 4109 root = NULL; 4110 goto failed_mount4; 4111 } 4112 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 4113 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 4114 iput(root); 4115 goto failed_mount4; 4116 } 4117 sb->s_root = d_make_root(root); 4118 if (!sb->s_root) { 4119 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 4120 ret = -ENOMEM; 4121 goto failed_mount4; 4122 } 4123 4124 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) 4125 sb->s_flags |= MS_RDONLY; 4126 4127 /* determine the minimum size of new large inodes, if present */ 4128 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE && 4129 sbi->s_want_extra_isize == 0) { 4130 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 4131 EXT4_GOOD_OLD_INODE_SIZE; 4132 if (ext4_has_feature_extra_isize(sb)) { 4133 if (sbi->s_want_extra_isize < 4134 le16_to_cpu(es->s_want_extra_isize)) 4135 sbi->s_want_extra_isize = 4136 le16_to_cpu(es->s_want_extra_isize); 4137 if (sbi->s_want_extra_isize < 4138 le16_to_cpu(es->s_min_extra_isize)) 4139 sbi->s_want_extra_isize = 4140 le16_to_cpu(es->s_min_extra_isize); 4141 } 4142 } 4143 /* Check if enough inode space is available */ 4144 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 4145 sbi->s_inode_size) { 4146 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 4147 EXT4_GOOD_OLD_INODE_SIZE; 4148 ext4_msg(sb, KERN_INFO, "required extra inode space not" 4149 "available"); 4150 } 4151 4152 ext4_set_resv_clusters(sb); 4153 4154 err = ext4_setup_system_zone(sb); 4155 if (err) { 4156 ext4_msg(sb, KERN_ERR, "failed to initialize system " 4157 "zone (%d)", err); 4158 goto failed_mount4a; 4159 } 4160 4161 ext4_ext_init(sb); 4162 err = ext4_mb_init(sb); 4163 if (err) { 4164 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 4165 err); 4166 goto failed_mount5; 4167 } 4168 4169 block = ext4_count_free_clusters(sb); 4170 ext4_free_blocks_count_set(sbi->s_es, 4171 EXT4_C2B(sbi, block)); 4172 err = percpu_counter_init(&sbi->s_freeclusters_counter, block, 4173 GFP_KERNEL); 4174 if (!err) { 4175 unsigned long freei = ext4_count_free_inodes(sb); 4176 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); 4177 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, 4178 GFP_KERNEL); 4179 } 4180 if (!err) 4181 err = percpu_counter_init(&sbi->s_dirs_counter, 4182 ext4_count_dirs(sb), GFP_KERNEL); 4183 if (!err) 4184 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, 4185 GFP_KERNEL); 4186 if (!err) 4187 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem); 4188 4189 if (err) { 4190 ext4_msg(sb, KERN_ERR, "insufficient memory"); 4191 goto failed_mount6; 4192 } 4193 4194 if (ext4_has_feature_flex_bg(sb)) 4195 if (!ext4_fill_flex_info(sb)) { 4196 ext4_msg(sb, KERN_ERR, 4197 "unable to initialize " 4198 "flex_bg meta info!"); 4199 goto failed_mount6; 4200 } 4201 4202 err = ext4_register_li_request(sb, first_not_zeroed); 4203 if (err) 4204 goto failed_mount6; 4205 4206 err = ext4_register_sysfs(sb); 4207 if (err) 4208 goto failed_mount7; 4209 4210 #ifdef CONFIG_QUOTA 4211 /* Enable quota usage during mount. */ 4212 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) { 4213 err = ext4_enable_quotas(sb); 4214 if (err) 4215 goto failed_mount8; 4216 } 4217 #endif /* CONFIG_QUOTA */ 4218 4219 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 4220 ext4_orphan_cleanup(sb, es); 4221 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 4222 if (needs_recovery) { 4223 ext4_msg(sb, KERN_INFO, "recovery complete"); 4224 ext4_mark_recovery_complete(sb, es); 4225 } 4226 if (EXT4_SB(sb)->s_journal) { 4227 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 4228 descr = " journalled data mode"; 4229 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 4230 descr = " ordered data mode"; 4231 else 4232 descr = " writeback data mode"; 4233 } else 4234 descr = "out journal"; 4235 4236 if (test_opt(sb, DISCARD)) { 4237 struct request_queue *q = bdev_get_queue(sb->s_bdev); 4238 if (!blk_queue_discard(q)) 4239 ext4_msg(sb, KERN_WARNING, 4240 "mounting with \"discard\" option, but " 4241 "the device does not support discard"); 4242 } 4243 4244 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount")) 4245 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 4246 "Opts: %.*s%s%s", descr, 4247 (int) sizeof(sbi->s_es->s_mount_opts), 4248 sbi->s_es->s_mount_opts, 4249 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 4250 4251 if (es->s_error_count) 4252 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 4253 4254 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ 4255 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); 4256 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); 4257 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); 4258 4259 kfree(orig_data); 4260 return 0; 4261 4262 cantfind_ext4: 4263 if (!silent) 4264 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 4265 goto failed_mount; 4266 4267 #ifdef CONFIG_QUOTA 4268 failed_mount8: 4269 ext4_unregister_sysfs(sb); 4270 #endif 4271 failed_mount7: 4272 ext4_unregister_li_request(sb); 4273 failed_mount6: 4274 ext4_mb_release(sb); 4275 if (sbi->s_flex_groups) 4276 kvfree(sbi->s_flex_groups); 4277 percpu_counter_destroy(&sbi->s_freeclusters_counter); 4278 percpu_counter_destroy(&sbi->s_freeinodes_counter); 4279 percpu_counter_destroy(&sbi->s_dirs_counter); 4280 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 4281 failed_mount5: 4282 ext4_ext_release(sb); 4283 ext4_release_system_zone(sb); 4284 failed_mount4a: 4285 dput(sb->s_root); 4286 sb->s_root = NULL; 4287 failed_mount4: 4288 ext4_msg(sb, KERN_ERR, "mount failed"); 4289 if (EXT4_SB(sb)->rsv_conversion_wq) 4290 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); 4291 failed_mount_wq: 4292 if (sbi->s_mb_cache) { 4293 ext4_xattr_destroy_cache(sbi->s_mb_cache); 4294 sbi->s_mb_cache = NULL; 4295 } 4296 if (sbi->s_journal) { 4297 jbd2_journal_destroy(sbi->s_journal); 4298 sbi->s_journal = NULL; 4299 } 4300 failed_mount3a: 4301 ext4_es_unregister_shrinker(sbi); 4302 failed_mount3: 4303 del_timer_sync(&sbi->s_err_report); 4304 if (sbi->s_mmp_tsk) 4305 kthread_stop(sbi->s_mmp_tsk); 4306 failed_mount2: 4307 for (i = 0; i < db_count; i++) 4308 brelse(sbi->s_group_desc[i]); 4309 kvfree(sbi->s_group_desc); 4310 failed_mount: 4311 if (sbi->s_chksum_driver) 4312 crypto_free_shash(sbi->s_chksum_driver); 4313 #ifdef CONFIG_QUOTA 4314 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4315 kfree(sbi->s_qf_names[i]); 4316 #endif 4317 ext4_blkdev_remove(sbi); 4318 brelse(bh); 4319 out_fail: 4320 sb->s_fs_info = NULL; 4321 kfree(sbi->s_blockgroup_lock); 4322 out_free_base: 4323 kfree(sbi); 4324 kfree(orig_data); 4325 return err ? err : ret; 4326 } 4327 4328 /* 4329 * Setup any per-fs journal parameters now. We'll do this both on 4330 * initial mount, once the journal has been initialised but before we've 4331 * done any recovery; and again on any subsequent remount. 4332 */ 4333 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 4334 { 4335 struct ext4_sb_info *sbi = EXT4_SB(sb); 4336 4337 journal->j_commit_interval = sbi->s_commit_interval; 4338 journal->j_min_batch_time = sbi->s_min_batch_time; 4339 journal->j_max_batch_time = sbi->s_max_batch_time; 4340 4341 write_lock(&journal->j_state_lock); 4342 if (test_opt(sb, BARRIER)) 4343 journal->j_flags |= JBD2_BARRIER; 4344 else 4345 journal->j_flags &= ~JBD2_BARRIER; 4346 if (test_opt(sb, DATA_ERR_ABORT)) 4347 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 4348 else 4349 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 4350 write_unlock(&journal->j_state_lock); 4351 } 4352 4353 static struct inode *ext4_get_journal_inode(struct super_block *sb, 4354 unsigned int journal_inum) 4355 { 4356 struct inode *journal_inode; 4357 4358 /* 4359 * Test for the existence of a valid inode on disk. Bad things 4360 * happen if we iget() an unused inode, as the subsequent iput() 4361 * will try to delete it. 4362 */ 4363 journal_inode = ext4_iget(sb, journal_inum); 4364 if (IS_ERR(journal_inode)) { 4365 ext4_msg(sb, KERN_ERR, "no journal found"); 4366 return NULL; 4367 } 4368 if (!journal_inode->i_nlink) { 4369 make_bad_inode(journal_inode); 4370 iput(journal_inode); 4371 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 4372 return NULL; 4373 } 4374 4375 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 4376 journal_inode, journal_inode->i_size); 4377 if (!S_ISREG(journal_inode->i_mode)) { 4378 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 4379 iput(journal_inode); 4380 return NULL; 4381 } 4382 return journal_inode; 4383 } 4384 4385 static journal_t *ext4_get_journal(struct super_block *sb, 4386 unsigned int journal_inum) 4387 { 4388 struct inode *journal_inode; 4389 journal_t *journal; 4390 4391 BUG_ON(!ext4_has_feature_journal(sb)); 4392 4393 journal_inode = ext4_get_journal_inode(sb, journal_inum); 4394 if (!journal_inode) 4395 return NULL; 4396 4397 journal = jbd2_journal_init_inode(journal_inode); 4398 if (!journal) { 4399 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 4400 iput(journal_inode); 4401 return NULL; 4402 } 4403 journal->j_private = sb; 4404 ext4_init_journal_params(sb, journal); 4405 return journal; 4406 } 4407 4408 static journal_t *ext4_get_dev_journal(struct super_block *sb, 4409 dev_t j_dev) 4410 { 4411 struct buffer_head *bh; 4412 journal_t *journal; 4413 ext4_fsblk_t start; 4414 ext4_fsblk_t len; 4415 int hblock, blocksize; 4416 ext4_fsblk_t sb_block; 4417 unsigned long offset; 4418 struct ext4_super_block *es; 4419 struct block_device *bdev; 4420 4421 BUG_ON(!ext4_has_feature_journal(sb)); 4422 4423 bdev = ext4_blkdev_get(j_dev, sb); 4424 if (bdev == NULL) 4425 return NULL; 4426 4427 blocksize = sb->s_blocksize; 4428 hblock = bdev_logical_block_size(bdev); 4429 if (blocksize < hblock) { 4430 ext4_msg(sb, KERN_ERR, 4431 "blocksize too small for journal device"); 4432 goto out_bdev; 4433 } 4434 4435 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 4436 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 4437 set_blocksize(bdev, blocksize); 4438 if (!(bh = __bread(bdev, sb_block, blocksize))) { 4439 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 4440 "external journal"); 4441 goto out_bdev; 4442 } 4443 4444 es = (struct ext4_super_block *) (bh->b_data + offset); 4445 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 4446 !(le32_to_cpu(es->s_feature_incompat) & 4447 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 4448 ext4_msg(sb, KERN_ERR, "external journal has " 4449 "bad superblock"); 4450 brelse(bh); 4451 goto out_bdev; 4452 } 4453 4454 if ((le32_to_cpu(es->s_feature_ro_compat) & 4455 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 4456 es->s_checksum != ext4_superblock_csum(sb, es)) { 4457 ext4_msg(sb, KERN_ERR, "external journal has " 4458 "corrupt superblock"); 4459 brelse(bh); 4460 goto out_bdev; 4461 } 4462 4463 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 4464 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 4465 brelse(bh); 4466 goto out_bdev; 4467 } 4468 4469 len = ext4_blocks_count(es); 4470 start = sb_block + 1; 4471 brelse(bh); /* we're done with the superblock */ 4472 4473 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 4474 start, len, blocksize); 4475 if (!journal) { 4476 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 4477 goto out_bdev; 4478 } 4479 journal->j_private = sb; 4480 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer); 4481 wait_on_buffer(journal->j_sb_buffer); 4482 if (!buffer_uptodate(journal->j_sb_buffer)) { 4483 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 4484 goto out_journal; 4485 } 4486 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 4487 ext4_msg(sb, KERN_ERR, "External journal has more than one " 4488 "user (unsupported) - %d", 4489 be32_to_cpu(journal->j_superblock->s_nr_users)); 4490 goto out_journal; 4491 } 4492 EXT4_SB(sb)->journal_bdev = bdev; 4493 ext4_init_journal_params(sb, journal); 4494 return journal; 4495 4496 out_journal: 4497 jbd2_journal_destroy(journal); 4498 out_bdev: 4499 ext4_blkdev_put(bdev); 4500 return NULL; 4501 } 4502 4503 static int ext4_load_journal(struct super_block *sb, 4504 struct ext4_super_block *es, 4505 unsigned long journal_devnum) 4506 { 4507 journal_t *journal; 4508 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 4509 dev_t journal_dev; 4510 int err = 0; 4511 int really_read_only; 4512 4513 BUG_ON(!ext4_has_feature_journal(sb)); 4514 4515 if (journal_devnum && 4516 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4517 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 4518 "numbers have changed"); 4519 journal_dev = new_decode_dev(journal_devnum); 4520 } else 4521 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 4522 4523 really_read_only = bdev_read_only(sb->s_bdev); 4524 4525 /* 4526 * Are we loading a blank journal or performing recovery after a 4527 * crash? For recovery, we need to check in advance whether we 4528 * can get read-write access to the device. 4529 */ 4530 if (ext4_has_feature_journal_needs_recovery(sb)) { 4531 if (sb->s_flags & MS_RDONLY) { 4532 ext4_msg(sb, KERN_INFO, "INFO: recovery " 4533 "required on readonly filesystem"); 4534 if (really_read_only) { 4535 ext4_msg(sb, KERN_ERR, "write access " 4536 "unavailable, cannot proceed"); 4537 return -EROFS; 4538 } 4539 ext4_msg(sb, KERN_INFO, "write access will " 4540 "be enabled during recovery"); 4541 } 4542 } 4543 4544 if (journal_inum && journal_dev) { 4545 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4546 "and inode journals!"); 4547 return -EINVAL; 4548 } 4549 4550 if (journal_inum) { 4551 if (!(journal = ext4_get_journal(sb, journal_inum))) 4552 return -EINVAL; 4553 } else { 4554 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4555 return -EINVAL; 4556 } 4557 4558 if (!(journal->j_flags & JBD2_BARRIER)) 4559 ext4_msg(sb, KERN_INFO, "barriers disabled"); 4560 4561 if (!ext4_has_feature_journal_needs_recovery(sb)) 4562 err = jbd2_journal_wipe(journal, !really_read_only); 4563 if (!err) { 4564 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 4565 if (save) 4566 memcpy(save, ((char *) es) + 4567 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4568 err = jbd2_journal_load(journal); 4569 if (save) 4570 memcpy(((char *) es) + EXT4_S_ERR_START, 4571 save, EXT4_S_ERR_LEN); 4572 kfree(save); 4573 } 4574 4575 if (err) { 4576 ext4_msg(sb, KERN_ERR, "error loading journal"); 4577 jbd2_journal_destroy(journal); 4578 return err; 4579 } 4580 4581 EXT4_SB(sb)->s_journal = journal; 4582 ext4_clear_journal_err(sb, es); 4583 4584 if (!really_read_only && journal_devnum && 4585 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4586 es->s_journal_dev = cpu_to_le32(journal_devnum); 4587 4588 /* Make sure we flush the recovery flag to disk. */ 4589 ext4_commit_super(sb, 1); 4590 } 4591 4592 return 0; 4593 } 4594 4595 static int ext4_commit_super(struct super_block *sb, int sync) 4596 { 4597 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4598 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4599 int error = 0; 4600 4601 if (!sbh || block_device_ejected(sb)) 4602 return error; 4603 /* 4604 * If the file system is mounted read-only, don't update the 4605 * superblock write time. This avoids updating the superblock 4606 * write time when we are mounting the root file system 4607 * read/only but we need to replay the journal; at that point, 4608 * for people who are east of GMT and who make their clock 4609 * tick in localtime for Windows bug-for-bug compatibility, 4610 * the clock is set in the future, and this will cause e2fsck 4611 * to complain and force a full file system check. 4612 */ 4613 if (!(sb->s_flags & MS_RDONLY)) 4614 es->s_wtime = cpu_to_le32(get_seconds()); 4615 if (sb->s_bdev->bd_part) 4616 es->s_kbytes_written = 4617 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4618 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4619 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4620 else 4621 es->s_kbytes_written = 4622 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 4623 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter)) 4624 ext4_free_blocks_count_set(es, 4625 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( 4626 &EXT4_SB(sb)->s_freeclusters_counter))); 4627 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter)) 4628 es->s_free_inodes_count = 4629 cpu_to_le32(percpu_counter_sum_positive( 4630 &EXT4_SB(sb)->s_freeinodes_counter)); 4631 BUFFER_TRACE(sbh, "marking dirty"); 4632 ext4_superblock_csum_set(sb); 4633 if (sync) 4634 lock_buffer(sbh); 4635 if (buffer_write_io_error(sbh)) { 4636 /* 4637 * Oh, dear. A previous attempt to write the 4638 * superblock failed. This could happen because the 4639 * USB device was yanked out. Or it could happen to 4640 * be a transient write error and maybe the block will 4641 * be remapped. Nothing we can do but to retry the 4642 * write and hope for the best. 4643 */ 4644 ext4_msg(sb, KERN_ERR, "previous I/O error to " 4645 "superblock detected"); 4646 clear_buffer_write_io_error(sbh); 4647 set_buffer_uptodate(sbh); 4648 } 4649 mark_buffer_dirty(sbh); 4650 if (sync) { 4651 unlock_buffer(sbh); 4652 error = __sync_dirty_buffer(sbh, 4653 test_opt(sb, BARRIER) ? REQ_FUA : REQ_SYNC); 4654 if (error) 4655 return error; 4656 4657 error = buffer_write_io_error(sbh); 4658 if (error) { 4659 ext4_msg(sb, KERN_ERR, "I/O error while writing " 4660 "superblock"); 4661 clear_buffer_write_io_error(sbh); 4662 set_buffer_uptodate(sbh); 4663 } 4664 } 4665 return error; 4666 } 4667 4668 /* 4669 * Have we just finished recovery? If so, and if we are mounting (or 4670 * remounting) the filesystem readonly, then we will end up with a 4671 * consistent fs on disk. Record that fact. 4672 */ 4673 static void ext4_mark_recovery_complete(struct super_block *sb, 4674 struct ext4_super_block *es) 4675 { 4676 journal_t *journal = EXT4_SB(sb)->s_journal; 4677 4678 if (!ext4_has_feature_journal(sb)) { 4679 BUG_ON(journal != NULL); 4680 return; 4681 } 4682 jbd2_journal_lock_updates(journal); 4683 if (jbd2_journal_flush(journal) < 0) 4684 goto out; 4685 4686 if (ext4_has_feature_journal_needs_recovery(sb) && 4687 sb->s_flags & MS_RDONLY) { 4688 ext4_clear_feature_journal_needs_recovery(sb); 4689 ext4_commit_super(sb, 1); 4690 } 4691 4692 out: 4693 jbd2_journal_unlock_updates(journal); 4694 } 4695 4696 /* 4697 * If we are mounting (or read-write remounting) a filesystem whose journal 4698 * has recorded an error from a previous lifetime, move that error to the 4699 * main filesystem now. 4700 */ 4701 static void ext4_clear_journal_err(struct super_block *sb, 4702 struct ext4_super_block *es) 4703 { 4704 journal_t *journal; 4705 int j_errno; 4706 const char *errstr; 4707 4708 BUG_ON(!ext4_has_feature_journal(sb)); 4709 4710 journal = EXT4_SB(sb)->s_journal; 4711 4712 /* 4713 * Now check for any error status which may have been recorded in the 4714 * journal by a prior ext4_error() or ext4_abort() 4715 */ 4716 4717 j_errno = jbd2_journal_errno(journal); 4718 if (j_errno) { 4719 char nbuf[16]; 4720 4721 errstr = ext4_decode_error(sb, j_errno, nbuf); 4722 ext4_warning(sb, "Filesystem error recorded " 4723 "from previous mount: %s", errstr); 4724 ext4_warning(sb, "Marking fs in need of filesystem check."); 4725 4726 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4727 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4728 ext4_commit_super(sb, 1); 4729 4730 jbd2_journal_clear_err(journal); 4731 jbd2_journal_update_sb_errno(journal); 4732 } 4733 } 4734 4735 /* 4736 * Force the running and committing transactions to commit, 4737 * and wait on the commit. 4738 */ 4739 int ext4_force_commit(struct super_block *sb) 4740 { 4741 journal_t *journal; 4742 4743 if (sb->s_flags & MS_RDONLY) 4744 return 0; 4745 4746 journal = EXT4_SB(sb)->s_journal; 4747 return ext4_journal_force_commit(journal); 4748 } 4749 4750 static int ext4_sync_fs(struct super_block *sb, int wait) 4751 { 4752 int ret = 0; 4753 tid_t target; 4754 bool needs_barrier = false; 4755 struct ext4_sb_info *sbi = EXT4_SB(sb); 4756 4757 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 4758 return 0; 4759 4760 trace_ext4_sync_fs(sb, wait); 4761 flush_workqueue(sbi->rsv_conversion_wq); 4762 /* 4763 * Writeback quota in non-journalled quota case - journalled quota has 4764 * no dirty dquots 4765 */ 4766 dquot_writeback_dquots(sb, -1); 4767 /* 4768 * Data writeback is possible w/o journal transaction, so barrier must 4769 * being sent at the end of the function. But we can skip it if 4770 * transaction_commit will do it for us. 4771 */ 4772 if (sbi->s_journal) { 4773 target = jbd2_get_latest_transaction(sbi->s_journal); 4774 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && 4775 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) 4776 needs_barrier = true; 4777 4778 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4779 if (wait) 4780 ret = jbd2_log_wait_commit(sbi->s_journal, 4781 target); 4782 } 4783 } else if (wait && test_opt(sb, BARRIER)) 4784 needs_barrier = true; 4785 if (needs_barrier) { 4786 int err; 4787 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 4788 if (!ret) 4789 ret = err; 4790 } 4791 4792 return ret; 4793 } 4794 4795 /* 4796 * LVM calls this function before a (read-only) snapshot is created. This 4797 * gives us a chance to flush the journal completely and mark the fs clean. 4798 * 4799 * Note that only this function cannot bring a filesystem to be in a clean 4800 * state independently. It relies on upper layer to stop all data & metadata 4801 * modifications. 4802 */ 4803 static int ext4_freeze(struct super_block *sb) 4804 { 4805 int error = 0; 4806 journal_t *journal; 4807 4808 if (sb->s_flags & MS_RDONLY) 4809 return 0; 4810 4811 journal = EXT4_SB(sb)->s_journal; 4812 4813 if (journal) { 4814 /* Now we set up the journal barrier. */ 4815 jbd2_journal_lock_updates(journal); 4816 4817 /* 4818 * Don't clear the needs_recovery flag if we failed to 4819 * flush the journal. 4820 */ 4821 error = jbd2_journal_flush(journal); 4822 if (error < 0) 4823 goto out; 4824 4825 /* Journal blocked and flushed, clear needs_recovery flag. */ 4826 ext4_clear_feature_journal_needs_recovery(sb); 4827 } 4828 4829 error = ext4_commit_super(sb, 1); 4830 out: 4831 if (journal) 4832 /* we rely on upper layer to stop further updates */ 4833 jbd2_journal_unlock_updates(journal); 4834 return error; 4835 } 4836 4837 /* 4838 * Called by LVM after the snapshot is done. We need to reset the RECOVER 4839 * flag here, even though the filesystem is not technically dirty yet. 4840 */ 4841 static int ext4_unfreeze(struct super_block *sb) 4842 { 4843 if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb))) 4844 return 0; 4845 4846 if (EXT4_SB(sb)->s_journal) { 4847 /* Reset the needs_recovery flag before the fs is unlocked. */ 4848 ext4_set_feature_journal_needs_recovery(sb); 4849 } 4850 4851 ext4_commit_super(sb, 1); 4852 return 0; 4853 } 4854 4855 /* 4856 * Structure to save mount options for ext4_remount's benefit 4857 */ 4858 struct ext4_mount_options { 4859 unsigned long s_mount_opt; 4860 unsigned long s_mount_opt2; 4861 kuid_t s_resuid; 4862 kgid_t s_resgid; 4863 unsigned long s_commit_interval; 4864 u32 s_min_batch_time, s_max_batch_time; 4865 #ifdef CONFIG_QUOTA 4866 int s_jquota_fmt; 4867 char *s_qf_names[EXT4_MAXQUOTAS]; 4868 #endif 4869 }; 4870 4871 static int ext4_remount(struct super_block *sb, int *flags, char *data) 4872 { 4873 struct ext4_super_block *es; 4874 struct ext4_sb_info *sbi = EXT4_SB(sb); 4875 unsigned long old_sb_flags; 4876 struct ext4_mount_options old_opts; 4877 int enable_quota = 0; 4878 ext4_group_t g; 4879 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4880 int err = 0; 4881 #ifdef CONFIG_QUOTA 4882 int i, j; 4883 #endif 4884 char *orig_data = kstrdup(data, GFP_KERNEL); 4885 4886 /* Store the original options */ 4887 old_sb_flags = sb->s_flags; 4888 old_opts.s_mount_opt = sbi->s_mount_opt; 4889 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4890 old_opts.s_resuid = sbi->s_resuid; 4891 old_opts.s_resgid = sbi->s_resgid; 4892 old_opts.s_commit_interval = sbi->s_commit_interval; 4893 old_opts.s_min_batch_time = sbi->s_min_batch_time; 4894 old_opts.s_max_batch_time = sbi->s_max_batch_time; 4895 #ifdef CONFIG_QUOTA 4896 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4897 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4898 if (sbi->s_qf_names[i]) { 4899 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], 4900 GFP_KERNEL); 4901 if (!old_opts.s_qf_names[i]) { 4902 for (j = 0; j < i; j++) 4903 kfree(old_opts.s_qf_names[j]); 4904 kfree(orig_data); 4905 return -ENOMEM; 4906 } 4907 } else 4908 old_opts.s_qf_names[i] = NULL; 4909 #endif 4910 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4911 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4912 4913 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { 4914 err = -EINVAL; 4915 goto restore_opts; 4916 } 4917 4918 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ 4919 test_opt(sb, JOURNAL_CHECKSUM)) { 4920 ext4_msg(sb, KERN_ERR, "changing journal_checksum " 4921 "during remount not supported; ignoring"); 4922 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; 4923 } 4924 4925 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 4926 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 4927 ext4_msg(sb, KERN_ERR, "can't mount with " 4928 "both data=journal and delalloc"); 4929 err = -EINVAL; 4930 goto restore_opts; 4931 } 4932 if (test_opt(sb, DIOREAD_NOLOCK)) { 4933 ext4_msg(sb, KERN_ERR, "can't mount with " 4934 "both data=journal and dioread_nolock"); 4935 err = -EINVAL; 4936 goto restore_opts; 4937 } 4938 if (test_opt(sb, DAX)) { 4939 ext4_msg(sb, KERN_ERR, "can't mount with " 4940 "both data=journal and dax"); 4941 err = -EINVAL; 4942 goto restore_opts; 4943 } 4944 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) { 4945 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 4946 ext4_msg(sb, KERN_ERR, "can't mount with " 4947 "journal_async_commit in data=ordered mode"); 4948 err = -EINVAL; 4949 goto restore_opts; 4950 } 4951 } 4952 4953 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) { 4954 ext4_msg(sb, KERN_WARNING, "warning: refusing change of " 4955 "dax flag with busy inodes while remounting"); 4956 sbi->s_mount_opt ^= EXT4_MOUNT_DAX; 4957 } 4958 4959 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 4960 ext4_abort(sb, "Abort forced by user"); 4961 4962 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 4963 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 4964 4965 es = sbi->s_es; 4966 4967 if (sbi->s_journal) { 4968 ext4_init_journal_params(sb, sbi->s_journal); 4969 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4970 } 4971 4972 if (*flags & MS_LAZYTIME) 4973 sb->s_flags |= MS_LAZYTIME; 4974 4975 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { 4976 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 4977 err = -EROFS; 4978 goto restore_opts; 4979 } 4980 4981 if (*flags & MS_RDONLY) { 4982 err = sync_filesystem(sb); 4983 if (err < 0) 4984 goto restore_opts; 4985 err = dquot_suspend(sb, -1); 4986 if (err < 0) 4987 goto restore_opts; 4988 4989 /* 4990 * First of all, the unconditional stuff we have to do 4991 * to disable replay of the journal when we next remount 4992 */ 4993 sb->s_flags |= MS_RDONLY; 4994 4995 /* 4996 * OK, test if we are remounting a valid rw partition 4997 * readonly, and if so set the rdonly flag and then 4998 * mark the partition as valid again. 4999 */ 5000 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 5001 (sbi->s_mount_state & EXT4_VALID_FS)) 5002 es->s_state = cpu_to_le16(sbi->s_mount_state); 5003 5004 if (sbi->s_journal) 5005 ext4_mark_recovery_complete(sb, es); 5006 } else { 5007 /* Make sure we can mount this feature set readwrite */ 5008 if (ext4_has_feature_readonly(sb) || 5009 !ext4_feature_set_ok(sb, 0)) { 5010 err = -EROFS; 5011 goto restore_opts; 5012 } 5013 /* 5014 * Make sure the group descriptor checksums 5015 * are sane. If they aren't, refuse to remount r/w. 5016 */ 5017 for (g = 0; g < sbi->s_groups_count; g++) { 5018 struct ext4_group_desc *gdp = 5019 ext4_get_group_desc(sb, g, NULL); 5020 5021 if (!ext4_group_desc_csum_verify(sb, g, gdp)) { 5022 ext4_msg(sb, KERN_ERR, 5023 "ext4_remount: Checksum for group %u failed (%u!=%u)", 5024 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)), 5025 le16_to_cpu(gdp->bg_checksum)); 5026 err = -EFSBADCRC; 5027 goto restore_opts; 5028 } 5029 } 5030 5031 /* 5032 * If we have an unprocessed orphan list hanging 5033 * around from a previously readonly bdev mount, 5034 * require a full umount/remount for now. 5035 */ 5036 if (es->s_last_orphan) { 5037 ext4_msg(sb, KERN_WARNING, "Couldn't " 5038 "remount RDWR because of unprocessed " 5039 "orphan inode list. Please " 5040 "umount/remount instead"); 5041 err = -EINVAL; 5042 goto restore_opts; 5043 } 5044 5045 /* 5046 * Mounting a RDONLY partition read-write, so reread 5047 * and store the current valid flag. (It may have 5048 * been changed by e2fsck since we originally mounted 5049 * the partition.) 5050 */ 5051 if (sbi->s_journal) 5052 ext4_clear_journal_err(sb, es); 5053 sbi->s_mount_state = le16_to_cpu(es->s_state); 5054 if (!ext4_setup_super(sb, es, 0)) 5055 sb->s_flags &= ~MS_RDONLY; 5056 if (ext4_has_feature_mmp(sb)) 5057 if (ext4_multi_mount_protect(sb, 5058 le64_to_cpu(es->s_mmp_block))) { 5059 err = -EROFS; 5060 goto restore_opts; 5061 } 5062 enable_quota = 1; 5063 } 5064 } 5065 5066 /* 5067 * Reinitialize lazy itable initialization thread based on 5068 * current settings 5069 */ 5070 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 5071 ext4_unregister_li_request(sb); 5072 else { 5073 ext4_group_t first_not_zeroed; 5074 first_not_zeroed = ext4_has_uninit_itable(sb); 5075 ext4_register_li_request(sb, first_not_zeroed); 5076 } 5077 5078 ext4_setup_system_zone(sb); 5079 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) 5080 ext4_commit_super(sb, 1); 5081 5082 #ifdef CONFIG_QUOTA 5083 /* Release old quota file names */ 5084 for (i = 0; i < EXT4_MAXQUOTAS; i++) 5085 kfree(old_opts.s_qf_names[i]); 5086 if (enable_quota) { 5087 if (sb_any_quota_suspended(sb)) 5088 dquot_resume(sb, -1); 5089 else if (ext4_has_feature_quota(sb)) { 5090 err = ext4_enable_quotas(sb); 5091 if (err) 5092 goto restore_opts; 5093 } 5094 } 5095 #endif 5096 5097 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME); 5098 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 5099 kfree(orig_data); 5100 return 0; 5101 5102 restore_opts: 5103 sb->s_flags = old_sb_flags; 5104 sbi->s_mount_opt = old_opts.s_mount_opt; 5105 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 5106 sbi->s_resuid = old_opts.s_resuid; 5107 sbi->s_resgid = old_opts.s_resgid; 5108 sbi->s_commit_interval = old_opts.s_commit_interval; 5109 sbi->s_min_batch_time = old_opts.s_min_batch_time; 5110 sbi->s_max_batch_time = old_opts.s_max_batch_time; 5111 #ifdef CONFIG_QUOTA 5112 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 5113 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 5114 kfree(sbi->s_qf_names[i]); 5115 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 5116 } 5117 #endif 5118 kfree(orig_data); 5119 return err; 5120 } 5121 5122 #ifdef CONFIG_QUOTA 5123 static int ext4_statfs_project(struct super_block *sb, 5124 kprojid_t projid, struct kstatfs *buf) 5125 { 5126 struct kqid qid; 5127 struct dquot *dquot; 5128 u64 limit; 5129 u64 curblock; 5130 5131 qid = make_kqid_projid(projid); 5132 dquot = dqget(sb, qid); 5133 if (IS_ERR(dquot)) 5134 return PTR_ERR(dquot); 5135 spin_lock(&dq_data_lock); 5136 5137 limit = (dquot->dq_dqb.dqb_bsoftlimit ? 5138 dquot->dq_dqb.dqb_bsoftlimit : 5139 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits; 5140 if (limit && buf->f_blocks > limit) { 5141 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits; 5142 buf->f_blocks = limit; 5143 buf->f_bfree = buf->f_bavail = 5144 (buf->f_blocks > curblock) ? 5145 (buf->f_blocks - curblock) : 0; 5146 } 5147 5148 limit = dquot->dq_dqb.dqb_isoftlimit ? 5149 dquot->dq_dqb.dqb_isoftlimit : 5150 dquot->dq_dqb.dqb_ihardlimit; 5151 if (limit && buf->f_files > limit) { 5152 buf->f_files = limit; 5153 buf->f_ffree = 5154 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ? 5155 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0; 5156 } 5157 5158 spin_unlock(&dq_data_lock); 5159 dqput(dquot); 5160 return 0; 5161 } 5162 #endif 5163 5164 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 5165 { 5166 struct super_block *sb = dentry->d_sb; 5167 struct ext4_sb_info *sbi = EXT4_SB(sb); 5168 struct ext4_super_block *es = sbi->s_es; 5169 ext4_fsblk_t overhead = 0, resv_blocks; 5170 u64 fsid; 5171 s64 bfree; 5172 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); 5173 5174 if (!test_opt(sb, MINIX_DF)) 5175 overhead = sbi->s_overhead; 5176 5177 buf->f_type = EXT4_SUPER_MAGIC; 5178 buf->f_bsize = sb->s_blocksize; 5179 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); 5180 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 5181 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 5182 /* prevent underflow in case that few free space is available */ 5183 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 5184 buf->f_bavail = buf->f_bfree - 5185 (ext4_r_blocks_count(es) + resv_blocks); 5186 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) 5187 buf->f_bavail = 0; 5188 buf->f_files = le32_to_cpu(es->s_inodes_count); 5189 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 5190 buf->f_namelen = EXT4_NAME_LEN; 5191 fsid = le64_to_cpup((void *)es->s_uuid) ^ 5192 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 5193 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 5194 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 5195 5196 #ifdef CONFIG_QUOTA 5197 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) && 5198 sb_has_quota_limits_enabled(sb, PRJQUOTA)) 5199 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf); 5200 #endif 5201 return 0; 5202 } 5203 5204 /* Helper function for writing quotas on sync - we need to start transaction 5205 * before quota file is locked for write. Otherwise the are possible deadlocks: 5206 * Process 1 Process 2 5207 * ext4_create() quota_sync() 5208 * jbd2_journal_start() write_dquot() 5209 * dquot_initialize() down(dqio_mutex) 5210 * down(dqio_mutex) jbd2_journal_start() 5211 * 5212 */ 5213 5214 #ifdef CONFIG_QUOTA 5215 5216 static inline struct inode *dquot_to_inode(struct dquot *dquot) 5217 { 5218 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 5219 } 5220 5221 static int ext4_write_dquot(struct dquot *dquot) 5222 { 5223 int ret, err; 5224 handle_t *handle; 5225 struct inode *inode; 5226 5227 inode = dquot_to_inode(dquot); 5228 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 5229 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 5230 if (IS_ERR(handle)) 5231 return PTR_ERR(handle); 5232 ret = dquot_commit(dquot); 5233 err = ext4_journal_stop(handle); 5234 if (!ret) 5235 ret = err; 5236 return ret; 5237 } 5238 5239 static int ext4_acquire_dquot(struct dquot *dquot) 5240 { 5241 int ret, err; 5242 handle_t *handle; 5243 5244 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 5245 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 5246 if (IS_ERR(handle)) 5247 return PTR_ERR(handle); 5248 ret = dquot_acquire(dquot); 5249 err = ext4_journal_stop(handle); 5250 if (!ret) 5251 ret = err; 5252 return ret; 5253 } 5254 5255 static int ext4_release_dquot(struct dquot *dquot) 5256 { 5257 int ret, err; 5258 handle_t *handle; 5259 5260 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 5261 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 5262 if (IS_ERR(handle)) { 5263 /* Release dquot anyway to avoid endless cycle in dqput() */ 5264 dquot_release(dquot); 5265 return PTR_ERR(handle); 5266 } 5267 ret = dquot_release(dquot); 5268 err = ext4_journal_stop(handle); 5269 if (!ret) 5270 ret = err; 5271 return ret; 5272 } 5273 5274 static int ext4_mark_dquot_dirty(struct dquot *dquot) 5275 { 5276 struct super_block *sb = dquot->dq_sb; 5277 struct ext4_sb_info *sbi = EXT4_SB(sb); 5278 5279 /* Are we journaling quotas? */ 5280 if (ext4_has_feature_quota(sb) || 5281 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 5282 dquot_mark_dquot_dirty(dquot); 5283 return ext4_write_dquot(dquot); 5284 } else { 5285 return dquot_mark_dquot_dirty(dquot); 5286 } 5287 } 5288 5289 static int ext4_write_info(struct super_block *sb, int type) 5290 { 5291 int ret, err; 5292 handle_t *handle; 5293 5294 /* Data block + inode block */ 5295 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2); 5296 if (IS_ERR(handle)) 5297 return PTR_ERR(handle); 5298 ret = dquot_commit_info(sb, type); 5299 err = ext4_journal_stop(handle); 5300 if (!ret) 5301 ret = err; 5302 return ret; 5303 } 5304 5305 /* 5306 * Turn on quotas during mount time - we need to find 5307 * the quota file and such... 5308 */ 5309 static int ext4_quota_on_mount(struct super_block *sb, int type) 5310 { 5311 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 5312 EXT4_SB(sb)->s_jquota_fmt, type); 5313 } 5314 5315 static void lockdep_set_quota_inode(struct inode *inode, int subclass) 5316 { 5317 struct ext4_inode_info *ei = EXT4_I(inode); 5318 5319 /* The first argument of lockdep_set_subclass has to be 5320 * *exactly* the same as the argument to init_rwsem() --- in 5321 * this case, in init_once() --- or lockdep gets unhappy 5322 * because the name of the lock is set using the 5323 * stringification of the argument to init_rwsem(). 5324 */ 5325 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ 5326 lockdep_set_subclass(&ei->i_data_sem, subclass); 5327 } 5328 5329 /* 5330 * Standard function to be called on quota_on 5331 */ 5332 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 5333 const struct path *path) 5334 { 5335 int err; 5336 5337 if (!test_opt(sb, QUOTA)) 5338 return -EINVAL; 5339 5340 /* Quotafile not on the same filesystem? */ 5341 if (path->dentry->d_sb != sb) 5342 return -EXDEV; 5343 /* Journaling quota? */ 5344 if (EXT4_SB(sb)->s_qf_names[type]) { 5345 /* Quotafile not in fs root? */ 5346 if (path->dentry->d_parent != sb->s_root) 5347 ext4_msg(sb, KERN_WARNING, 5348 "Quota file not on filesystem root. " 5349 "Journaled quota will not work"); 5350 } 5351 5352 /* 5353 * When we journal data on quota file, we have to flush journal to see 5354 * all updates to the file when we bypass pagecache... 5355 */ 5356 if (EXT4_SB(sb)->s_journal && 5357 ext4_should_journal_data(d_inode(path->dentry))) { 5358 /* 5359 * We don't need to lock updates but journal_flush() could 5360 * otherwise be livelocked... 5361 */ 5362 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 5363 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 5364 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 5365 if (err) 5366 return err; 5367 } 5368 5369 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA); 5370 err = dquot_quota_on(sb, type, format_id, path); 5371 if (err) { 5372 lockdep_set_quota_inode(path->dentry->d_inode, 5373 I_DATA_SEM_NORMAL); 5374 } else { 5375 struct inode *inode = d_inode(path->dentry); 5376 handle_t *handle; 5377 5378 /* 5379 * Set inode flags to prevent userspace from messing with quota 5380 * files. If this fails, we return success anyway since quotas 5381 * are already enabled and this is not a hard failure. 5382 */ 5383 inode_lock(inode); 5384 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 5385 if (IS_ERR(handle)) 5386 goto unlock_inode; 5387 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL; 5388 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 5389 S_NOATIME | S_IMMUTABLE); 5390 ext4_mark_inode_dirty(handle, inode); 5391 ext4_journal_stop(handle); 5392 unlock_inode: 5393 inode_unlock(inode); 5394 } 5395 return err; 5396 } 5397 5398 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 5399 unsigned int flags) 5400 { 5401 int err; 5402 struct inode *qf_inode; 5403 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 5404 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 5405 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 5406 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 5407 }; 5408 5409 BUG_ON(!ext4_has_feature_quota(sb)); 5410 5411 if (!qf_inums[type]) 5412 return -EPERM; 5413 5414 qf_inode = ext4_iget(sb, qf_inums[type]); 5415 if (IS_ERR(qf_inode)) { 5416 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); 5417 return PTR_ERR(qf_inode); 5418 } 5419 5420 /* Don't account quota for quota files to avoid recursion */ 5421 qf_inode->i_flags |= S_NOQUOTA; 5422 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); 5423 err = dquot_enable(qf_inode, type, format_id, flags); 5424 iput(qf_inode); 5425 if (err) 5426 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); 5427 5428 return err; 5429 } 5430 5431 /* Enable usage tracking for all quota types. */ 5432 static int ext4_enable_quotas(struct super_block *sb) 5433 { 5434 int type, err = 0; 5435 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 5436 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 5437 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 5438 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 5439 }; 5440 bool quota_mopt[EXT4_MAXQUOTAS] = { 5441 test_opt(sb, USRQUOTA), 5442 test_opt(sb, GRPQUOTA), 5443 test_opt(sb, PRJQUOTA), 5444 }; 5445 5446 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 5447 for (type = 0; type < EXT4_MAXQUOTAS; type++) { 5448 if (qf_inums[type]) { 5449 err = ext4_quota_enable(sb, type, QFMT_VFS_V1, 5450 DQUOT_USAGE_ENABLED | 5451 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0)); 5452 if (err) { 5453 ext4_warning(sb, 5454 "Failed to enable quota tracking " 5455 "(type=%d, err=%d). Please run " 5456 "e2fsck to fix.", type, err); 5457 return err; 5458 } 5459 } 5460 } 5461 return 0; 5462 } 5463 5464 static int ext4_quota_off(struct super_block *sb, int type) 5465 { 5466 struct inode *inode = sb_dqopt(sb)->files[type]; 5467 handle_t *handle; 5468 int err; 5469 5470 /* Force all delayed allocation blocks to be allocated. 5471 * Caller already holds s_umount sem */ 5472 if (test_opt(sb, DELALLOC)) 5473 sync_filesystem(sb); 5474 5475 if (!inode || !igrab(inode)) 5476 goto out; 5477 5478 err = dquot_quota_off(sb, type); 5479 if (err) 5480 goto out_put; 5481 5482 inode_lock(inode); 5483 /* 5484 * Update modification times of quota files when userspace can 5485 * start looking at them. If we fail, we return success anyway since 5486 * this is not a hard failure and quotas are already disabled. 5487 */ 5488 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 5489 if (IS_ERR(handle)) 5490 goto out_unlock; 5491 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL); 5492 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 5493 inode->i_mtime = inode->i_ctime = current_time(inode); 5494 ext4_mark_inode_dirty(handle, inode); 5495 ext4_journal_stop(handle); 5496 out_unlock: 5497 inode_unlock(inode); 5498 out_put: 5499 iput(inode); 5500 return err; 5501 out: 5502 return dquot_quota_off(sb, type); 5503 } 5504 5505 /* Read data from quotafile - avoid pagecache and such because we cannot afford 5506 * acquiring the locks... As quota files are never truncated and quota code 5507 * itself serializes the operations (and no one else should touch the files) 5508 * we don't have to be afraid of races */ 5509 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 5510 size_t len, loff_t off) 5511 { 5512 struct inode *inode = sb_dqopt(sb)->files[type]; 5513 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5514 int offset = off & (sb->s_blocksize - 1); 5515 int tocopy; 5516 size_t toread; 5517 struct buffer_head *bh; 5518 loff_t i_size = i_size_read(inode); 5519 5520 if (off > i_size) 5521 return 0; 5522 if (off+len > i_size) 5523 len = i_size-off; 5524 toread = len; 5525 while (toread > 0) { 5526 tocopy = sb->s_blocksize - offset < toread ? 5527 sb->s_blocksize - offset : toread; 5528 bh = ext4_bread(NULL, inode, blk, 0); 5529 if (IS_ERR(bh)) 5530 return PTR_ERR(bh); 5531 if (!bh) /* A hole? */ 5532 memset(data, 0, tocopy); 5533 else 5534 memcpy(data, bh->b_data+offset, tocopy); 5535 brelse(bh); 5536 offset = 0; 5537 toread -= tocopy; 5538 data += tocopy; 5539 blk++; 5540 } 5541 return len; 5542 } 5543 5544 /* Write to quotafile (we know the transaction is already started and has 5545 * enough credits) */ 5546 static ssize_t ext4_quota_write(struct super_block *sb, int type, 5547 const char *data, size_t len, loff_t off) 5548 { 5549 struct inode *inode = sb_dqopt(sb)->files[type]; 5550 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5551 int err, offset = off & (sb->s_blocksize - 1); 5552 int retries = 0; 5553 struct buffer_head *bh; 5554 handle_t *handle = journal_current_handle(); 5555 5556 if (EXT4_SB(sb)->s_journal && !handle) { 5557 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5558 " cancelled because transaction is not started", 5559 (unsigned long long)off, (unsigned long long)len); 5560 return -EIO; 5561 } 5562 /* 5563 * Since we account only one data block in transaction credits, 5564 * then it is impossible to cross a block boundary. 5565 */ 5566 if (sb->s_blocksize - offset < len) { 5567 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5568 " cancelled because not block aligned", 5569 (unsigned long long)off, (unsigned long long)len); 5570 return -EIO; 5571 } 5572 5573 do { 5574 bh = ext4_bread(handle, inode, blk, 5575 EXT4_GET_BLOCKS_CREATE | 5576 EXT4_GET_BLOCKS_METADATA_NOFAIL); 5577 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) && 5578 ext4_should_retry_alloc(inode->i_sb, &retries)); 5579 if (IS_ERR(bh)) 5580 return PTR_ERR(bh); 5581 if (!bh) 5582 goto out; 5583 BUFFER_TRACE(bh, "get write access"); 5584 err = ext4_journal_get_write_access(handle, bh); 5585 if (err) { 5586 brelse(bh); 5587 return err; 5588 } 5589 lock_buffer(bh); 5590 memcpy(bh->b_data+offset, data, len); 5591 flush_dcache_page(bh->b_page); 5592 unlock_buffer(bh); 5593 err = ext4_handle_dirty_metadata(handle, NULL, bh); 5594 brelse(bh); 5595 out: 5596 if (inode->i_size < off + len) { 5597 i_size_write(inode, off + len); 5598 EXT4_I(inode)->i_disksize = inode->i_size; 5599 ext4_mark_inode_dirty(handle, inode); 5600 } 5601 return len; 5602 } 5603 5604 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid) 5605 { 5606 const struct quota_format_ops *ops; 5607 5608 if (!sb_has_quota_loaded(sb, qid->type)) 5609 return -ESRCH; 5610 ops = sb_dqopt(sb)->ops[qid->type]; 5611 if (!ops || !ops->get_next_id) 5612 return -ENOSYS; 5613 return dquot_get_next_id(sb, qid); 5614 } 5615 #endif 5616 5617 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 5618 const char *dev_name, void *data) 5619 { 5620 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 5621 } 5622 5623 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 5624 static inline void register_as_ext2(void) 5625 { 5626 int err = register_filesystem(&ext2_fs_type); 5627 if (err) 5628 printk(KERN_WARNING 5629 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 5630 } 5631 5632 static inline void unregister_as_ext2(void) 5633 { 5634 unregister_filesystem(&ext2_fs_type); 5635 } 5636 5637 static inline int ext2_feature_set_ok(struct super_block *sb) 5638 { 5639 if (ext4_has_unknown_ext2_incompat_features(sb)) 5640 return 0; 5641 if (sb->s_flags & MS_RDONLY) 5642 return 1; 5643 if (ext4_has_unknown_ext2_ro_compat_features(sb)) 5644 return 0; 5645 return 1; 5646 } 5647 #else 5648 static inline void register_as_ext2(void) { } 5649 static inline void unregister_as_ext2(void) { } 5650 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 5651 #endif 5652 5653 static inline void register_as_ext3(void) 5654 { 5655 int err = register_filesystem(&ext3_fs_type); 5656 if (err) 5657 printk(KERN_WARNING 5658 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 5659 } 5660 5661 static inline void unregister_as_ext3(void) 5662 { 5663 unregister_filesystem(&ext3_fs_type); 5664 } 5665 5666 static inline int ext3_feature_set_ok(struct super_block *sb) 5667 { 5668 if (ext4_has_unknown_ext3_incompat_features(sb)) 5669 return 0; 5670 if (!ext4_has_feature_journal(sb)) 5671 return 0; 5672 if (sb->s_flags & MS_RDONLY) 5673 return 1; 5674 if (ext4_has_unknown_ext3_ro_compat_features(sb)) 5675 return 0; 5676 return 1; 5677 } 5678 5679 static struct file_system_type ext4_fs_type = { 5680 .owner = THIS_MODULE, 5681 .name = "ext4", 5682 .mount = ext4_mount, 5683 .kill_sb = kill_block_super, 5684 .fs_flags = FS_REQUIRES_DEV, 5685 }; 5686 MODULE_ALIAS_FS("ext4"); 5687 5688 /* Shared across all ext4 file systems */ 5689 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 5690 5691 static int __init ext4_init_fs(void) 5692 { 5693 int i, err; 5694 5695 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); 5696 ext4_li_info = NULL; 5697 mutex_init(&ext4_li_mtx); 5698 5699 /* Build-time check for flags consistency */ 5700 ext4_check_flag_values(); 5701 5702 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) 5703 init_waitqueue_head(&ext4__ioend_wq[i]); 5704 5705 err = ext4_init_es(); 5706 if (err) 5707 return err; 5708 5709 err = ext4_init_pageio(); 5710 if (err) 5711 goto out5; 5712 5713 err = ext4_init_system_zone(); 5714 if (err) 5715 goto out4; 5716 5717 err = ext4_init_sysfs(); 5718 if (err) 5719 goto out3; 5720 5721 err = ext4_init_mballoc(); 5722 if (err) 5723 goto out2; 5724 err = init_inodecache(); 5725 if (err) 5726 goto out1; 5727 register_as_ext3(); 5728 register_as_ext2(); 5729 err = register_filesystem(&ext4_fs_type); 5730 if (err) 5731 goto out; 5732 5733 return 0; 5734 out: 5735 unregister_as_ext2(); 5736 unregister_as_ext3(); 5737 destroy_inodecache(); 5738 out1: 5739 ext4_exit_mballoc(); 5740 out2: 5741 ext4_exit_sysfs(); 5742 out3: 5743 ext4_exit_system_zone(); 5744 out4: 5745 ext4_exit_pageio(); 5746 out5: 5747 ext4_exit_es(); 5748 5749 return err; 5750 } 5751 5752 static void __exit ext4_exit_fs(void) 5753 { 5754 ext4_destroy_lazyinit_thread(); 5755 unregister_as_ext2(); 5756 unregister_as_ext3(); 5757 unregister_filesystem(&ext4_fs_type); 5758 destroy_inodecache(); 5759 ext4_exit_mballoc(); 5760 ext4_exit_sysfs(); 5761 ext4_exit_system_zone(); 5762 ext4_exit_pageio(); 5763 ext4_exit_es(); 5764 } 5765 5766 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 5767 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5768 MODULE_LICENSE("GPL"); 5769 module_init(ext4_init_fs) 5770 module_exit(ext4_exit_fs) 5771