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/jbd2.h> 25 #include <linux/slab.h> 26 #include <linux/init.h> 27 #include <linux/blkdev.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/proc_fs.h> 38 #include <linux/ctype.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 #include <linux/cleancache.h> 42 #include <asm/uaccess.h> 43 44 #include <linux/kthread.h> 45 #include <linux/freezer.h> 46 47 #include "ext4.h" 48 #include "ext4_extents.h" /* Needed for trace points definition */ 49 #include "ext4_jbd2.h" 50 #include "xattr.h" 51 #include "acl.h" 52 #include "mballoc.h" 53 54 #define CREATE_TRACE_POINTS 55 #include <trace/events/ext4.h> 56 57 static struct proc_dir_entry *ext4_proc_root; 58 static struct kset *ext4_kset; 59 static struct ext4_lazy_init *ext4_li_info; 60 static struct mutex ext4_li_mtx; 61 static struct ext4_features *ext4_feat; 62 63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 64 unsigned long journal_devnum); 65 static int ext4_show_options(struct seq_file *seq, struct dentry *root); 66 static int ext4_commit_super(struct super_block *sb, int sync); 67 static void ext4_mark_recovery_complete(struct super_block *sb, 68 struct ext4_super_block *es); 69 static void ext4_clear_journal_err(struct super_block *sb, 70 struct ext4_super_block *es); 71 static int ext4_sync_fs(struct super_block *sb, int wait); 72 static int ext4_remount(struct super_block *sb, int *flags, char *data); 73 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 74 static int ext4_unfreeze(struct super_block *sb); 75 static int ext4_freeze(struct super_block *sb); 76 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 77 const char *dev_name, void *data); 78 static inline int ext2_feature_set_ok(struct super_block *sb); 79 static inline int ext3_feature_set_ok(struct super_block *sb); 80 static int ext4_feature_set_ok(struct super_block *sb, int readonly); 81 static void ext4_destroy_lazyinit_thread(void); 82 static void ext4_unregister_li_request(struct super_block *sb); 83 static void ext4_clear_request_list(void); 84 85 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 86 static struct file_system_type ext2_fs_type = { 87 .owner = THIS_MODULE, 88 .name = "ext2", 89 .mount = ext4_mount, 90 .kill_sb = kill_block_super, 91 .fs_flags = FS_REQUIRES_DEV, 92 }; 93 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 94 #else 95 #define IS_EXT2_SB(sb) (0) 96 #endif 97 98 99 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 100 static struct file_system_type ext3_fs_type = { 101 .owner = THIS_MODULE, 102 .name = "ext3", 103 .mount = ext4_mount, 104 .kill_sb = kill_block_super, 105 .fs_flags = FS_REQUIRES_DEV, 106 }; 107 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 108 #else 109 #define IS_EXT3_SB(sb) (0) 110 #endif 111 112 static int ext4_verify_csum_type(struct super_block *sb, 113 struct ext4_super_block *es) 114 { 115 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 116 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 117 return 1; 118 119 return es->s_checksum_type == EXT4_CRC32C_CHKSUM; 120 } 121 122 static __le32 ext4_superblock_csum(struct super_block *sb, 123 struct ext4_super_block *es) 124 { 125 struct ext4_sb_info *sbi = EXT4_SB(sb); 126 int offset = offsetof(struct ext4_super_block, s_checksum); 127 __u32 csum; 128 129 csum = ext4_chksum(sbi, ~0, (char *)es, offset); 130 131 return cpu_to_le32(csum); 132 } 133 134 int ext4_superblock_csum_verify(struct super_block *sb, 135 struct ext4_super_block *es) 136 { 137 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 138 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 139 return 1; 140 141 return es->s_checksum == ext4_superblock_csum(sb, es); 142 } 143 144 void ext4_superblock_csum_set(struct super_block *sb) 145 { 146 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 147 148 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 149 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 150 return; 151 152 es->s_checksum = ext4_superblock_csum(sb, es); 153 } 154 155 void *ext4_kvmalloc(size_t size, gfp_t flags) 156 { 157 void *ret; 158 159 ret = kmalloc(size, flags); 160 if (!ret) 161 ret = __vmalloc(size, flags, PAGE_KERNEL); 162 return ret; 163 } 164 165 void *ext4_kvzalloc(size_t size, gfp_t flags) 166 { 167 void *ret; 168 169 ret = kzalloc(size, flags); 170 if (!ret) 171 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 172 return ret; 173 } 174 175 void ext4_kvfree(void *ptr) 176 { 177 if (is_vmalloc_addr(ptr)) 178 vfree(ptr); 179 else 180 kfree(ptr); 181 182 } 183 184 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 185 struct ext4_group_desc *bg) 186 { 187 return le32_to_cpu(bg->bg_block_bitmap_lo) | 188 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 189 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 190 } 191 192 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 193 struct ext4_group_desc *bg) 194 { 195 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 196 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 197 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 198 } 199 200 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 201 struct ext4_group_desc *bg) 202 { 203 return le32_to_cpu(bg->bg_inode_table_lo) | 204 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 205 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 206 } 207 208 __u32 ext4_free_group_clusters(struct super_block *sb, 209 struct ext4_group_desc *bg) 210 { 211 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 212 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 213 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 214 } 215 216 __u32 ext4_free_inodes_count(struct super_block *sb, 217 struct ext4_group_desc *bg) 218 { 219 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 220 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 221 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 222 } 223 224 __u32 ext4_used_dirs_count(struct super_block *sb, 225 struct ext4_group_desc *bg) 226 { 227 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 228 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 229 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 230 } 231 232 __u32 ext4_itable_unused_count(struct super_block *sb, 233 struct ext4_group_desc *bg) 234 { 235 return le16_to_cpu(bg->bg_itable_unused_lo) | 236 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 237 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 238 } 239 240 void ext4_block_bitmap_set(struct super_block *sb, 241 struct ext4_group_desc *bg, ext4_fsblk_t blk) 242 { 243 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 244 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 245 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 246 } 247 248 void ext4_inode_bitmap_set(struct super_block *sb, 249 struct ext4_group_desc *bg, ext4_fsblk_t blk) 250 { 251 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 252 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 253 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 254 } 255 256 void ext4_inode_table_set(struct super_block *sb, 257 struct ext4_group_desc *bg, ext4_fsblk_t blk) 258 { 259 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 260 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 261 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 262 } 263 264 void ext4_free_group_clusters_set(struct super_block *sb, 265 struct ext4_group_desc *bg, __u32 count) 266 { 267 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 268 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 269 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 270 } 271 272 void ext4_free_inodes_set(struct super_block *sb, 273 struct ext4_group_desc *bg, __u32 count) 274 { 275 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 276 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 277 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 278 } 279 280 void ext4_used_dirs_set(struct super_block *sb, 281 struct ext4_group_desc *bg, __u32 count) 282 { 283 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 284 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 285 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 286 } 287 288 void ext4_itable_unused_set(struct super_block *sb, 289 struct ext4_group_desc *bg, __u32 count) 290 { 291 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 292 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 293 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 294 } 295 296 297 static void __save_error_info(struct super_block *sb, const char *func, 298 unsigned int line) 299 { 300 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 301 302 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 303 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 304 es->s_last_error_time = cpu_to_le32(get_seconds()); 305 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 306 es->s_last_error_line = cpu_to_le32(line); 307 if (!es->s_first_error_time) { 308 es->s_first_error_time = es->s_last_error_time; 309 strncpy(es->s_first_error_func, func, 310 sizeof(es->s_first_error_func)); 311 es->s_first_error_line = cpu_to_le32(line); 312 es->s_first_error_ino = es->s_last_error_ino; 313 es->s_first_error_block = es->s_last_error_block; 314 } 315 /* 316 * Start the daily error reporting function if it hasn't been 317 * started already 318 */ 319 if (!es->s_error_count) 320 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 321 le32_add_cpu(&es->s_error_count, 1); 322 } 323 324 static void save_error_info(struct super_block *sb, const char *func, 325 unsigned int line) 326 { 327 __save_error_info(sb, func, line); 328 ext4_commit_super(sb, 1); 329 } 330 331 /* 332 * The del_gendisk() function uninitializes the disk-specific data 333 * structures, including the bdi structure, without telling anyone 334 * else. Once this happens, any attempt to call mark_buffer_dirty() 335 * (for example, by ext4_commit_super), will cause a kernel OOPS. 336 * This is a kludge to prevent these oops until we can put in a proper 337 * hook in del_gendisk() to inform the VFS and file system layers. 338 */ 339 static int block_device_ejected(struct super_block *sb) 340 { 341 struct inode *bd_inode = sb->s_bdev->bd_inode; 342 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info; 343 344 return bdi->dev == NULL; 345 } 346 347 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 348 { 349 struct super_block *sb = journal->j_private; 350 struct ext4_sb_info *sbi = EXT4_SB(sb); 351 int error = is_journal_aborted(journal); 352 struct ext4_journal_cb_entry *jce, *tmp; 353 354 spin_lock(&sbi->s_md_lock); 355 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) { 356 list_del_init(&jce->jce_list); 357 spin_unlock(&sbi->s_md_lock); 358 jce->jce_func(sb, jce, error); 359 spin_lock(&sbi->s_md_lock); 360 } 361 spin_unlock(&sbi->s_md_lock); 362 } 363 364 /* Deal with the reporting of failure conditions on a filesystem such as 365 * inconsistencies detected or read IO failures. 366 * 367 * On ext2, we can store the error state of the filesystem in the 368 * superblock. That is not possible on ext4, because we may have other 369 * write ordering constraints on the superblock which prevent us from 370 * writing it out straight away; and given that the journal is about to 371 * be aborted, we can't rely on the current, or future, transactions to 372 * write out the superblock safely. 373 * 374 * We'll just use the jbd2_journal_abort() error code to record an error in 375 * the journal instead. On recovery, the journal will complain about 376 * that error until we've noted it down and cleared it. 377 */ 378 379 static void ext4_handle_error(struct super_block *sb) 380 { 381 if (sb->s_flags & MS_RDONLY) 382 return; 383 384 if (!test_opt(sb, ERRORS_CONT)) { 385 journal_t *journal = EXT4_SB(sb)->s_journal; 386 387 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 388 if (journal) 389 jbd2_journal_abort(journal, -EIO); 390 } 391 if (test_opt(sb, ERRORS_RO)) { 392 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 393 sb->s_flags |= MS_RDONLY; 394 } 395 if (test_opt(sb, ERRORS_PANIC)) 396 panic("EXT4-fs (device %s): panic forced after error\n", 397 sb->s_id); 398 } 399 400 void __ext4_error(struct super_block *sb, const char *function, 401 unsigned int line, const char *fmt, ...) 402 { 403 struct va_format vaf; 404 va_list args; 405 406 va_start(args, fmt); 407 vaf.fmt = fmt; 408 vaf.va = &args; 409 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 410 sb->s_id, function, line, current->comm, &vaf); 411 va_end(args); 412 save_error_info(sb, function, line); 413 414 ext4_handle_error(sb); 415 } 416 417 void ext4_error_inode(struct inode *inode, const char *function, 418 unsigned int line, ext4_fsblk_t block, 419 const char *fmt, ...) 420 { 421 va_list args; 422 struct va_format vaf; 423 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 424 425 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 426 es->s_last_error_block = cpu_to_le64(block); 427 save_error_info(inode->i_sb, function, line); 428 va_start(args, fmt); 429 vaf.fmt = fmt; 430 vaf.va = &args; 431 if (block) 432 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 433 "inode #%lu: block %llu: comm %s: %pV\n", 434 inode->i_sb->s_id, function, line, inode->i_ino, 435 block, current->comm, &vaf); 436 else 437 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 438 "inode #%lu: comm %s: %pV\n", 439 inode->i_sb->s_id, function, line, inode->i_ino, 440 current->comm, &vaf); 441 va_end(args); 442 443 ext4_handle_error(inode->i_sb); 444 } 445 446 void ext4_error_file(struct file *file, const char *function, 447 unsigned int line, ext4_fsblk_t block, 448 const char *fmt, ...) 449 { 450 va_list args; 451 struct va_format vaf; 452 struct ext4_super_block *es; 453 struct inode *inode = file_inode(file); 454 char pathname[80], *path; 455 456 es = EXT4_SB(inode->i_sb)->s_es; 457 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 458 save_error_info(inode->i_sb, function, line); 459 path = d_path(&(file->f_path), pathname, sizeof(pathname)); 460 if (IS_ERR(path)) 461 path = "(unknown)"; 462 va_start(args, fmt); 463 vaf.fmt = fmt; 464 vaf.va = &args; 465 if (block) 466 printk(KERN_CRIT 467 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 468 "block %llu: comm %s: path %s: %pV\n", 469 inode->i_sb->s_id, function, line, inode->i_ino, 470 block, current->comm, path, &vaf); 471 else 472 printk(KERN_CRIT 473 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 474 "comm %s: path %s: %pV\n", 475 inode->i_sb->s_id, function, line, inode->i_ino, 476 current->comm, path, &vaf); 477 va_end(args); 478 479 ext4_handle_error(inode->i_sb); 480 } 481 482 const char *ext4_decode_error(struct super_block *sb, int errno, 483 char nbuf[16]) 484 { 485 char *errstr = NULL; 486 487 switch (errno) { 488 case -EIO: 489 errstr = "IO failure"; 490 break; 491 case -ENOMEM: 492 errstr = "Out of memory"; 493 break; 494 case -EROFS: 495 if (!sb || (EXT4_SB(sb)->s_journal && 496 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 497 errstr = "Journal has aborted"; 498 else 499 errstr = "Readonly filesystem"; 500 break; 501 default: 502 /* If the caller passed in an extra buffer for unknown 503 * errors, textualise them now. Else we just return 504 * NULL. */ 505 if (nbuf) { 506 /* Check for truncated error codes... */ 507 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 508 errstr = nbuf; 509 } 510 break; 511 } 512 513 return errstr; 514 } 515 516 /* __ext4_std_error decodes expected errors from journaling functions 517 * automatically and invokes the appropriate error response. */ 518 519 void __ext4_std_error(struct super_block *sb, const char *function, 520 unsigned int line, int errno) 521 { 522 char nbuf[16]; 523 const char *errstr; 524 525 /* Special case: if the error is EROFS, and we're not already 526 * inside a transaction, then there's really no point in logging 527 * an error. */ 528 if (errno == -EROFS && journal_current_handle() == NULL && 529 (sb->s_flags & MS_RDONLY)) 530 return; 531 532 errstr = ext4_decode_error(sb, errno, nbuf); 533 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 534 sb->s_id, function, line, errstr); 535 save_error_info(sb, function, line); 536 537 ext4_handle_error(sb); 538 } 539 540 /* 541 * ext4_abort is a much stronger failure handler than ext4_error. The 542 * abort function may be used to deal with unrecoverable failures such 543 * as journal IO errors or ENOMEM at a critical moment in log management. 544 * 545 * We unconditionally force the filesystem into an ABORT|READONLY state, 546 * unless the error response on the fs has been set to panic in which 547 * case we take the easy way out and panic immediately. 548 */ 549 550 void __ext4_abort(struct super_block *sb, const char *function, 551 unsigned int line, const char *fmt, ...) 552 { 553 va_list args; 554 555 save_error_info(sb, function, line); 556 va_start(args, fmt); 557 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 558 function, line); 559 vprintk(fmt, args); 560 printk("\n"); 561 va_end(args); 562 563 if ((sb->s_flags & MS_RDONLY) == 0) { 564 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 565 sb->s_flags |= MS_RDONLY; 566 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 567 if (EXT4_SB(sb)->s_journal) 568 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 569 save_error_info(sb, function, line); 570 } 571 if (test_opt(sb, ERRORS_PANIC)) 572 panic("EXT4-fs panic from previous error\n"); 573 } 574 575 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) 576 { 577 struct va_format vaf; 578 va_list args; 579 580 va_start(args, fmt); 581 vaf.fmt = fmt; 582 vaf.va = &args; 583 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 584 va_end(args); 585 } 586 587 void __ext4_warning(struct super_block *sb, const char *function, 588 unsigned int line, const char *fmt, ...) 589 { 590 struct va_format vaf; 591 va_list args; 592 593 va_start(args, fmt); 594 vaf.fmt = fmt; 595 vaf.va = &args; 596 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 597 sb->s_id, function, line, &vaf); 598 va_end(args); 599 } 600 601 void __ext4_grp_locked_error(const char *function, unsigned int line, 602 struct super_block *sb, ext4_group_t grp, 603 unsigned long ino, ext4_fsblk_t block, 604 const char *fmt, ...) 605 __releases(bitlock) 606 __acquires(bitlock) 607 { 608 struct va_format vaf; 609 va_list args; 610 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 611 612 es->s_last_error_ino = cpu_to_le32(ino); 613 es->s_last_error_block = cpu_to_le64(block); 614 __save_error_info(sb, function, line); 615 616 va_start(args, fmt); 617 618 vaf.fmt = fmt; 619 vaf.va = &args; 620 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 621 sb->s_id, function, line, grp); 622 if (ino) 623 printk(KERN_CONT "inode %lu: ", ino); 624 if (block) 625 printk(KERN_CONT "block %llu:", (unsigned long long) block); 626 printk(KERN_CONT "%pV\n", &vaf); 627 va_end(args); 628 629 if (test_opt(sb, ERRORS_CONT)) { 630 ext4_commit_super(sb, 0); 631 return; 632 } 633 634 ext4_unlock_group(sb, grp); 635 ext4_handle_error(sb); 636 /* 637 * We only get here in the ERRORS_RO case; relocking the group 638 * may be dangerous, but nothing bad will happen since the 639 * filesystem will have already been marked read/only and the 640 * journal has been aborted. We return 1 as a hint to callers 641 * who might what to use the return value from 642 * ext4_grp_locked_error() to distinguish between the 643 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 644 * aggressively from the ext4 function in question, with a 645 * more appropriate error code. 646 */ 647 ext4_lock_group(sb, grp); 648 return; 649 } 650 651 void ext4_update_dynamic_rev(struct super_block *sb) 652 { 653 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 654 655 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 656 return; 657 658 ext4_warning(sb, 659 "updating to rev %d because of new feature flag, " 660 "running e2fsck is recommended", 661 EXT4_DYNAMIC_REV); 662 663 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 664 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 665 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 666 /* leave es->s_feature_*compat flags alone */ 667 /* es->s_uuid will be set by e2fsck if empty */ 668 669 /* 670 * The rest of the superblock fields should be zero, and if not it 671 * means they are likely already in use, so leave them alone. We 672 * can leave it up to e2fsck to clean up any inconsistencies there. 673 */ 674 } 675 676 /* 677 * Open the external journal device 678 */ 679 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 680 { 681 struct block_device *bdev; 682 char b[BDEVNAME_SIZE]; 683 684 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 685 if (IS_ERR(bdev)) 686 goto fail; 687 return bdev; 688 689 fail: 690 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 691 __bdevname(dev, b), PTR_ERR(bdev)); 692 return NULL; 693 } 694 695 /* 696 * Release the journal device 697 */ 698 static int ext4_blkdev_put(struct block_device *bdev) 699 { 700 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 701 } 702 703 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 704 { 705 struct block_device *bdev; 706 int ret = -ENODEV; 707 708 bdev = sbi->journal_bdev; 709 if (bdev) { 710 ret = ext4_blkdev_put(bdev); 711 sbi->journal_bdev = NULL; 712 } 713 return ret; 714 } 715 716 static inline struct inode *orphan_list_entry(struct list_head *l) 717 { 718 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 719 } 720 721 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 722 { 723 struct list_head *l; 724 725 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 726 le32_to_cpu(sbi->s_es->s_last_orphan)); 727 728 printk(KERN_ERR "sb_info orphan list:\n"); 729 list_for_each(l, &sbi->s_orphan) { 730 struct inode *inode = orphan_list_entry(l); 731 printk(KERN_ERR " " 732 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 733 inode->i_sb->s_id, inode->i_ino, inode, 734 inode->i_mode, inode->i_nlink, 735 NEXT_ORPHAN(inode)); 736 } 737 } 738 739 static void ext4_put_super(struct super_block *sb) 740 { 741 struct ext4_sb_info *sbi = EXT4_SB(sb); 742 struct ext4_super_block *es = sbi->s_es; 743 int i, err; 744 745 ext4_unregister_li_request(sb); 746 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 747 748 flush_workqueue(sbi->dio_unwritten_wq); 749 destroy_workqueue(sbi->dio_unwritten_wq); 750 751 if (sbi->s_journal) { 752 err = jbd2_journal_destroy(sbi->s_journal); 753 sbi->s_journal = NULL; 754 if (err < 0) 755 ext4_abort(sb, "Couldn't clean up the journal"); 756 } 757 758 ext4_es_unregister_shrinker(sb); 759 del_timer(&sbi->s_err_report); 760 ext4_release_system_zone(sb); 761 ext4_mb_release(sb); 762 ext4_ext_release(sb); 763 ext4_xattr_put_super(sb); 764 765 if (!(sb->s_flags & MS_RDONLY)) { 766 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 767 es->s_state = cpu_to_le16(sbi->s_mount_state); 768 } 769 if (!(sb->s_flags & MS_RDONLY)) 770 ext4_commit_super(sb, 1); 771 772 if (sbi->s_proc) { 773 remove_proc_entry("options", sbi->s_proc); 774 remove_proc_entry(sb->s_id, ext4_proc_root); 775 } 776 kobject_del(&sbi->s_kobj); 777 778 for (i = 0; i < sbi->s_gdb_count; i++) 779 brelse(sbi->s_group_desc[i]); 780 ext4_kvfree(sbi->s_group_desc); 781 ext4_kvfree(sbi->s_flex_groups); 782 percpu_counter_destroy(&sbi->s_freeclusters_counter); 783 percpu_counter_destroy(&sbi->s_freeinodes_counter); 784 percpu_counter_destroy(&sbi->s_dirs_counter); 785 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 786 brelse(sbi->s_sbh); 787 #ifdef CONFIG_QUOTA 788 for (i = 0; i < MAXQUOTAS; i++) 789 kfree(sbi->s_qf_names[i]); 790 #endif 791 792 /* Debugging code just in case the in-memory inode orphan list 793 * isn't empty. The on-disk one can be non-empty if we've 794 * detected an error and taken the fs readonly, but the 795 * in-memory list had better be clean by this point. */ 796 if (!list_empty(&sbi->s_orphan)) 797 dump_orphan_list(sb, sbi); 798 J_ASSERT(list_empty(&sbi->s_orphan)); 799 800 invalidate_bdev(sb->s_bdev); 801 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 802 /* 803 * Invalidate the journal device's buffers. We don't want them 804 * floating about in memory - the physical journal device may 805 * hotswapped, and it breaks the `ro-after' testing code. 806 */ 807 sync_blockdev(sbi->journal_bdev); 808 invalidate_bdev(sbi->journal_bdev); 809 ext4_blkdev_remove(sbi); 810 } 811 if (sbi->s_mmp_tsk) 812 kthread_stop(sbi->s_mmp_tsk); 813 sb->s_fs_info = NULL; 814 /* 815 * Now that we are completely done shutting down the 816 * superblock, we need to actually destroy the kobject. 817 */ 818 kobject_put(&sbi->s_kobj); 819 wait_for_completion(&sbi->s_kobj_unregister); 820 if (sbi->s_chksum_driver) 821 crypto_free_shash(sbi->s_chksum_driver); 822 kfree(sbi->s_blockgroup_lock); 823 kfree(sbi); 824 } 825 826 static struct kmem_cache *ext4_inode_cachep; 827 828 /* 829 * Called inside transaction, so use GFP_NOFS 830 */ 831 static struct inode *ext4_alloc_inode(struct super_block *sb) 832 { 833 struct ext4_inode_info *ei; 834 835 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 836 if (!ei) 837 return NULL; 838 839 ei->vfs_inode.i_version = 1; 840 INIT_LIST_HEAD(&ei->i_prealloc_list); 841 spin_lock_init(&ei->i_prealloc_lock); 842 ext4_es_init_tree(&ei->i_es_tree); 843 rwlock_init(&ei->i_es_lock); 844 INIT_LIST_HEAD(&ei->i_es_lru); 845 ei->i_es_lru_nr = 0; 846 ei->i_reserved_data_blocks = 0; 847 ei->i_reserved_meta_blocks = 0; 848 ei->i_allocated_meta_blocks = 0; 849 ei->i_da_metadata_calc_len = 0; 850 ei->i_da_metadata_calc_last_lblock = 0; 851 spin_lock_init(&(ei->i_block_reservation_lock)); 852 #ifdef CONFIG_QUOTA 853 ei->i_reserved_quota = 0; 854 #endif 855 ei->jinode = NULL; 856 INIT_LIST_HEAD(&ei->i_completed_io_list); 857 spin_lock_init(&ei->i_completed_io_lock); 858 ei->i_sync_tid = 0; 859 ei->i_datasync_tid = 0; 860 atomic_set(&ei->i_ioend_count, 0); 861 atomic_set(&ei->i_unwritten, 0); 862 INIT_WORK(&ei->i_unwritten_work, ext4_end_io_work); 863 864 return &ei->vfs_inode; 865 } 866 867 static int ext4_drop_inode(struct inode *inode) 868 { 869 int drop = generic_drop_inode(inode); 870 871 trace_ext4_drop_inode(inode, drop); 872 return drop; 873 } 874 875 static void ext4_i_callback(struct rcu_head *head) 876 { 877 struct inode *inode = container_of(head, struct inode, i_rcu); 878 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 879 } 880 881 static void ext4_destroy_inode(struct inode *inode) 882 { 883 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 884 ext4_msg(inode->i_sb, KERN_ERR, 885 "Inode %lu (%p): orphan list check failed!", 886 inode->i_ino, EXT4_I(inode)); 887 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 888 EXT4_I(inode), sizeof(struct ext4_inode_info), 889 true); 890 dump_stack(); 891 } 892 call_rcu(&inode->i_rcu, ext4_i_callback); 893 } 894 895 static void init_once(void *foo) 896 { 897 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 898 899 INIT_LIST_HEAD(&ei->i_orphan); 900 init_rwsem(&ei->xattr_sem); 901 init_rwsem(&ei->i_data_sem); 902 inode_init_once(&ei->vfs_inode); 903 } 904 905 static int init_inodecache(void) 906 { 907 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 908 sizeof(struct ext4_inode_info), 909 0, (SLAB_RECLAIM_ACCOUNT| 910 SLAB_MEM_SPREAD), 911 init_once); 912 if (ext4_inode_cachep == NULL) 913 return -ENOMEM; 914 return 0; 915 } 916 917 static void destroy_inodecache(void) 918 { 919 /* 920 * Make sure all delayed rcu free inodes are flushed before we 921 * destroy cache. 922 */ 923 rcu_barrier(); 924 kmem_cache_destroy(ext4_inode_cachep); 925 } 926 927 void ext4_clear_inode(struct inode *inode) 928 { 929 invalidate_inode_buffers(inode); 930 clear_inode(inode); 931 dquot_drop(inode); 932 ext4_discard_preallocations(inode); 933 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); 934 ext4_es_lru_del(inode); 935 if (EXT4_I(inode)->jinode) { 936 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 937 EXT4_I(inode)->jinode); 938 jbd2_free_inode(EXT4_I(inode)->jinode); 939 EXT4_I(inode)->jinode = NULL; 940 } 941 } 942 943 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 944 u64 ino, u32 generation) 945 { 946 struct inode *inode; 947 948 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 949 return ERR_PTR(-ESTALE); 950 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 951 return ERR_PTR(-ESTALE); 952 953 /* iget isn't really right if the inode is currently unallocated!! 954 * 955 * ext4_read_inode will return a bad_inode if the inode had been 956 * deleted, so we should be safe. 957 * 958 * Currently we don't know the generation for parent directory, so 959 * a generation of 0 means "accept any" 960 */ 961 inode = ext4_iget(sb, ino); 962 if (IS_ERR(inode)) 963 return ERR_CAST(inode); 964 if (generation && inode->i_generation != generation) { 965 iput(inode); 966 return ERR_PTR(-ESTALE); 967 } 968 969 return inode; 970 } 971 972 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 973 int fh_len, int fh_type) 974 { 975 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 976 ext4_nfs_get_inode); 977 } 978 979 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 980 int fh_len, int fh_type) 981 { 982 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 983 ext4_nfs_get_inode); 984 } 985 986 /* 987 * Try to release metadata pages (indirect blocks, directories) which are 988 * mapped via the block device. Since these pages could have journal heads 989 * which would prevent try_to_free_buffers() from freeing them, we must use 990 * jbd2 layer's try_to_free_buffers() function to release them. 991 */ 992 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 993 gfp_t wait) 994 { 995 journal_t *journal = EXT4_SB(sb)->s_journal; 996 997 WARN_ON(PageChecked(page)); 998 if (!page_has_buffers(page)) 999 return 0; 1000 if (journal) 1001 return jbd2_journal_try_to_free_buffers(journal, page, 1002 wait & ~__GFP_WAIT); 1003 return try_to_free_buffers(page); 1004 } 1005 1006 #ifdef CONFIG_QUOTA 1007 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 1008 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 1009 1010 static int ext4_write_dquot(struct dquot *dquot); 1011 static int ext4_acquire_dquot(struct dquot *dquot); 1012 static int ext4_release_dquot(struct dquot *dquot); 1013 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1014 static int ext4_write_info(struct super_block *sb, int type); 1015 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1016 struct path *path); 1017 static int ext4_quota_on_sysfile(struct super_block *sb, int type, 1018 int format_id); 1019 static int ext4_quota_off(struct super_block *sb, int type); 1020 static int ext4_quota_off_sysfile(struct super_block *sb, int type); 1021 static int ext4_quota_on_mount(struct super_block *sb, int type); 1022 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1023 size_t len, loff_t off); 1024 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1025 const char *data, size_t len, loff_t off); 1026 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 1027 unsigned int flags); 1028 static int ext4_enable_quotas(struct super_block *sb); 1029 1030 static const struct dquot_operations ext4_quota_operations = { 1031 .get_reserved_space = ext4_get_reserved_space, 1032 .write_dquot = ext4_write_dquot, 1033 .acquire_dquot = ext4_acquire_dquot, 1034 .release_dquot = ext4_release_dquot, 1035 .mark_dirty = ext4_mark_dquot_dirty, 1036 .write_info = ext4_write_info, 1037 .alloc_dquot = dquot_alloc, 1038 .destroy_dquot = dquot_destroy, 1039 }; 1040 1041 static const struct quotactl_ops ext4_qctl_operations = { 1042 .quota_on = ext4_quota_on, 1043 .quota_off = ext4_quota_off, 1044 .quota_sync = dquot_quota_sync, 1045 .get_info = dquot_get_dqinfo, 1046 .set_info = dquot_set_dqinfo, 1047 .get_dqblk = dquot_get_dqblk, 1048 .set_dqblk = dquot_set_dqblk 1049 }; 1050 1051 static const struct quotactl_ops ext4_qctl_sysfile_operations = { 1052 .quota_on_meta = ext4_quota_on_sysfile, 1053 .quota_off = ext4_quota_off_sysfile, 1054 .quota_sync = dquot_quota_sync, 1055 .get_info = dquot_get_dqinfo, 1056 .set_info = dquot_set_dqinfo, 1057 .get_dqblk = dquot_get_dqblk, 1058 .set_dqblk = dquot_set_dqblk 1059 }; 1060 #endif 1061 1062 static const struct super_operations ext4_sops = { 1063 .alloc_inode = ext4_alloc_inode, 1064 .destroy_inode = ext4_destroy_inode, 1065 .write_inode = ext4_write_inode, 1066 .dirty_inode = ext4_dirty_inode, 1067 .drop_inode = ext4_drop_inode, 1068 .evict_inode = ext4_evict_inode, 1069 .put_super = ext4_put_super, 1070 .sync_fs = ext4_sync_fs, 1071 .freeze_fs = ext4_freeze, 1072 .unfreeze_fs = ext4_unfreeze, 1073 .statfs = ext4_statfs, 1074 .remount_fs = ext4_remount, 1075 .show_options = ext4_show_options, 1076 #ifdef CONFIG_QUOTA 1077 .quota_read = ext4_quota_read, 1078 .quota_write = ext4_quota_write, 1079 #endif 1080 .bdev_try_to_free_page = bdev_try_to_free_page, 1081 }; 1082 1083 static const struct super_operations ext4_nojournal_sops = { 1084 .alloc_inode = ext4_alloc_inode, 1085 .destroy_inode = ext4_destroy_inode, 1086 .write_inode = ext4_write_inode, 1087 .dirty_inode = ext4_dirty_inode, 1088 .drop_inode = ext4_drop_inode, 1089 .evict_inode = ext4_evict_inode, 1090 .put_super = ext4_put_super, 1091 .statfs = ext4_statfs, 1092 .remount_fs = ext4_remount, 1093 .show_options = ext4_show_options, 1094 #ifdef CONFIG_QUOTA 1095 .quota_read = ext4_quota_read, 1096 .quota_write = ext4_quota_write, 1097 #endif 1098 .bdev_try_to_free_page = bdev_try_to_free_page, 1099 }; 1100 1101 static const struct export_operations ext4_export_ops = { 1102 .fh_to_dentry = ext4_fh_to_dentry, 1103 .fh_to_parent = ext4_fh_to_parent, 1104 .get_parent = ext4_get_parent, 1105 }; 1106 1107 enum { 1108 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1109 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1110 Opt_nouid32, Opt_debug, Opt_removed, 1111 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1112 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 1113 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1114 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit, 1115 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1116 Opt_data_err_abort, Opt_data_err_ignore, 1117 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1118 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1119 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1120 Opt_usrquota, Opt_grpquota, Opt_i_version, 1121 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 1122 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1123 Opt_inode_readahead_blks, Opt_journal_ioprio, 1124 Opt_dioread_nolock, Opt_dioread_lock, 1125 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1126 Opt_max_dir_size_kb, 1127 }; 1128 1129 static const match_table_t tokens = { 1130 {Opt_bsd_df, "bsddf"}, 1131 {Opt_minix_df, "minixdf"}, 1132 {Opt_grpid, "grpid"}, 1133 {Opt_grpid, "bsdgroups"}, 1134 {Opt_nogrpid, "nogrpid"}, 1135 {Opt_nogrpid, "sysvgroups"}, 1136 {Opt_resgid, "resgid=%u"}, 1137 {Opt_resuid, "resuid=%u"}, 1138 {Opt_sb, "sb=%u"}, 1139 {Opt_err_cont, "errors=continue"}, 1140 {Opt_err_panic, "errors=panic"}, 1141 {Opt_err_ro, "errors=remount-ro"}, 1142 {Opt_nouid32, "nouid32"}, 1143 {Opt_debug, "debug"}, 1144 {Opt_removed, "oldalloc"}, 1145 {Opt_removed, "orlov"}, 1146 {Opt_user_xattr, "user_xattr"}, 1147 {Opt_nouser_xattr, "nouser_xattr"}, 1148 {Opt_acl, "acl"}, 1149 {Opt_noacl, "noacl"}, 1150 {Opt_noload, "norecovery"}, 1151 {Opt_noload, "noload"}, 1152 {Opt_removed, "nobh"}, 1153 {Opt_removed, "bh"}, 1154 {Opt_commit, "commit=%u"}, 1155 {Opt_min_batch_time, "min_batch_time=%u"}, 1156 {Opt_max_batch_time, "max_batch_time=%u"}, 1157 {Opt_journal_dev, "journal_dev=%u"}, 1158 {Opt_journal_checksum, "journal_checksum"}, 1159 {Opt_journal_async_commit, "journal_async_commit"}, 1160 {Opt_abort, "abort"}, 1161 {Opt_data_journal, "data=journal"}, 1162 {Opt_data_ordered, "data=ordered"}, 1163 {Opt_data_writeback, "data=writeback"}, 1164 {Opt_data_err_abort, "data_err=abort"}, 1165 {Opt_data_err_ignore, "data_err=ignore"}, 1166 {Opt_offusrjquota, "usrjquota="}, 1167 {Opt_usrjquota, "usrjquota=%s"}, 1168 {Opt_offgrpjquota, "grpjquota="}, 1169 {Opt_grpjquota, "grpjquota=%s"}, 1170 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1171 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1172 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1173 {Opt_grpquota, "grpquota"}, 1174 {Opt_noquota, "noquota"}, 1175 {Opt_quota, "quota"}, 1176 {Opt_usrquota, "usrquota"}, 1177 {Opt_barrier, "barrier=%u"}, 1178 {Opt_barrier, "barrier"}, 1179 {Opt_nobarrier, "nobarrier"}, 1180 {Opt_i_version, "i_version"}, 1181 {Opt_stripe, "stripe=%u"}, 1182 {Opt_delalloc, "delalloc"}, 1183 {Opt_nodelalloc, "nodelalloc"}, 1184 {Opt_removed, "mblk_io_submit"}, 1185 {Opt_removed, "nomblk_io_submit"}, 1186 {Opt_block_validity, "block_validity"}, 1187 {Opt_noblock_validity, "noblock_validity"}, 1188 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1189 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1190 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1191 {Opt_auto_da_alloc, "auto_da_alloc"}, 1192 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1193 {Opt_dioread_nolock, "dioread_nolock"}, 1194 {Opt_dioread_lock, "dioread_lock"}, 1195 {Opt_discard, "discard"}, 1196 {Opt_nodiscard, "nodiscard"}, 1197 {Opt_init_itable, "init_itable=%u"}, 1198 {Opt_init_itable, "init_itable"}, 1199 {Opt_noinit_itable, "noinit_itable"}, 1200 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, 1201 {Opt_removed, "check=none"}, /* mount option from ext2/3 */ 1202 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ 1203 {Opt_removed, "reservation"}, /* mount option from ext2/3 */ 1204 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ 1205 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ 1206 {Opt_err, NULL}, 1207 }; 1208 1209 static ext4_fsblk_t get_sb_block(void **data) 1210 { 1211 ext4_fsblk_t sb_block; 1212 char *options = (char *) *data; 1213 1214 if (!options || strncmp(options, "sb=", 3) != 0) 1215 return 1; /* Default location */ 1216 1217 options += 3; 1218 /* TODO: use simple_strtoll with >32bit ext4 */ 1219 sb_block = simple_strtoul(options, &options, 0); 1220 if (*options && *options != ',') { 1221 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1222 (char *) *data); 1223 return 1; 1224 } 1225 if (*options == ',') 1226 options++; 1227 *data = (void *) options; 1228 1229 return sb_block; 1230 } 1231 1232 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1233 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1234 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1235 1236 #ifdef CONFIG_QUOTA 1237 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1238 { 1239 struct ext4_sb_info *sbi = EXT4_SB(sb); 1240 char *qname; 1241 int ret = -1; 1242 1243 if (sb_any_quota_loaded(sb) && 1244 !sbi->s_qf_names[qtype]) { 1245 ext4_msg(sb, KERN_ERR, 1246 "Cannot change journaled " 1247 "quota options when quota turned on"); 1248 return -1; 1249 } 1250 qname = match_strdup(args); 1251 if (!qname) { 1252 ext4_msg(sb, KERN_ERR, 1253 "Not enough memory for storing quotafile name"); 1254 return -1; 1255 } 1256 if (sbi->s_qf_names[qtype]) { 1257 if (strcmp(sbi->s_qf_names[qtype], qname) == 0) 1258 ret = 1; 1259 else 1260 ext4_msg(sb, KERN_ERR, 1261 "%s quota file already specified", 1262 QTYPE2NAME(qtype)); 1263 goto errout; 1264 } 1265 if (strchr(qname, '/')) { 1266 ext4_msg(sb, KERN_ERR, 1267 "quotafile must be on filesystem root"); 1268 goto errout; 1269 } 1270 sbi->s_qf_names[qtype] = qname; 1271 set_opt(sb, QUOTA); 1272 return 1; 1273 errout: 1274 kfree(qname); 1275 return ret; 1276 } 1277 1278 static int clear_qf_name(struct super_block *sb, int qtype) 1279 { 1280 1281 struct ext4_sb_info *sbi = EXT4_SB(sb); 1282 1283 if (sb_any_quota_loaded(sb) && 1284 sbi->s_qf_names[qtype]) { 1285 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1286 " when quota turned on"); 1287 return -1; 1288 } 1289 kfree(sbi->s_qf_names[qtype]); 1290 sbi->s_qf_names[qtype] = NULL; 1291 return 1; 1292 } 1293 #endif 1294 1295 #define MOPT_SET 0x0001 1296 #define MOPT_CLEAR 0x0002 1297 #define MOPT_NOSUPPORT 0x0004 1298 #define MOPT_EXPLICIT 0x0008 1299 #define MOPT_CLEAR_ERR 0x0010 1300 #define MOPT_GTE0 0x0020 1301 #ifdef CONFIG_QUOTA 1302 #define MOPT_Q 0 1303 #define MOPT_QFMT 0x0040 1304 #else 1305 #define MOPT_Q MOPT_NOSUPPORT 1306 #define MOPT_QFMT MOPT_NOSUPPORT 1307 #endif 1308 #define MOPT_DATAJ 0x0080 1309 #define MOPT_NO_EXT2 0x0100 1310 #define MOPT_NO_EXT3 0x0200 1311 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) 1312 1313 static const struct mount_opts { 1314 int token; 1315 int mount_opt; 1316 int flags; 1317 } ext4_mount_opts[] = { 1318 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, 1319 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, 1320 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, 1321 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, 1322 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, 1323 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, 1324 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, 1325 MOPT_EXT4_ONLY | MOPT_SET}, 1326 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, 1327 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1328 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, 1329 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, 1330 {Opt_delalloc, EXT4_MOUNT_DELALLOC, 1331 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1332 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, 1333 MOPT_EXT4_ONLY | MOPT_CLEAR | MOPT_EXPLICIT}, 1334 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1335 MOPT_EXT4_ONLY | MOPT_SET}, 1336 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | 1337 EXT4_MOUNT_JOURNAL_CHECKSUM), 1338 MOPT_EXT4_ONLY | MOPT_SET}, 1339 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, 1340 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, 1341 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, 1342 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, 1343 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, 1344 MOPT_NO_EXT2 | MOPT_SET}, 1345 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, 1346 MOPT_NO_EXT2 | MOPT_CLEAR}, 1347 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, 1348 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, 1349 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, 1350 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, 1351 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, 1352 {Opt_commit, 0, MOPT_GTE0}, 1353 {Opt_max_batch_time, 0, MOPT_GTE0}, 1354 {Opt_min_batch_time, 0, MOPT_GTE0}, 1355 {Opt_inode_readahead_blks, 0, MOPT_GTE0}, 1356 {Opt_init_itable, 0, MOPT_GTE0}, 1357 {Opt_stripe, 0, MOPT_GTE0}, 1358 {Opt_resuid, 0, MOPT_GTE0}, 1359 {Opt_resgid, 0, MOPT_GTE0}, 1360 {Opt_journal_dev, 0, MOPT_GTE0}, 1361 {Opt_journal_ioprio, 0, MOPT_GTE0}, 1362 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1363 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1364 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, 1365 MOPT_NO_EXT2 | MOPT_DATAJ}, 1366 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, 1367 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, 1368 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1369 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, 1370 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, 1371 #else 1372 {Opt_acl, 0, MOPT_NOSUPPORT}, 1373 {Opt_noacl, 0, MOPT_NOSUPPORT}, 1374 #endif 1375 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, 1376 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, 1377 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, 1378 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, 1379 MOPT_SET | MOPT_Q}, 1380 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, 1381 MOPT_SET | MOPT_Q}, 1382 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 1383 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q}, 1384 {Opt_usrjquota, 0, MOPT_Q}, 1385 {Opt_grpjquota, 0, MOPT_Q}, 1386 {Opt_offusrjquota, 0, MOPT_Q}, 1387 {Opt_offgrpjquota, 0, MOPT_Q}, 1388 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, 1389 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, 1390 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, 1391 {Opt_max_dir_size_kb, 0, MOPT_GTE0}, 1392 {Opt_err, 0, 0} 1393 }; 1394 1395 static int handle_mount_opt(struct super_block *sb, char *opt, int token, 1396 substring_t *args, unsigned long *journal_devnum, 1397 unsigned int *journal_ioprio, int is_remount) 1398 { 1399 struct ext4_sb_info *sbi = EXT4_SB(sb); 1400 const struct mount_opts *m; 1401 kuid_t uid; 1402 kgid_t gid; 1403 int arg = 0; 1404 1405 #ifdef CONFIG_QUOTA 1406 if (token == Opt_usrjquota) 1407 return set_qf_name(sb, USRQUOTA, &args[0]); 1408 else if (token == Opt_grpjquota) 1409 return set_qf_name(sb, GRPQUOTA, &args[0]); 1410 else if (token == Opt_offusrjquota) 1411 return clear_qf_name(sb, USRQUOTA); 1412 else if (token == Opt_offgrpjquota) 1413 return clear_qf_name(sb, GRPQUOTA); 1414 #endif 1415 switch (token) { 1416 case Opt_noacl: 1417 case Opt_nouser_xattr: 1418 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); 1419 break; 1420 case Opt_sb: 1421 return 1; /* handled by get_sb_block() */ 1422 case Opt_removed: 1423 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); 1424 return 1; 1425 case Opt_abort: 1426 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1427 return 1; 1428 case Opt_i_version: 1429 sb->s_flags |= MS_I_VERSION; 1430 return 1; 1431 } 1432 1433 for (m = ext4_mount_opts; m->token != Opt_err; m++) 1434 if (token == m->token) 1435 break; 1436 1437 if (m->token == Opt_err) { 1438 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " 1439 "or missing value", opt); 1440 return -1; 1441 } 1442 1443 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { 1444 ext4_msg(sb, KERN_ERR, 1445 "Mount option \"%s\" incompatible with ext2", opt); 1446 return -1; 1447 } 1448 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { 1449 ext4_msg(sb, KERN_ERR, 1450 "Mount option \"%s\" incompatible with ext3", opt); 1451 return -1; 1452 } 1453 1454 if (args->from && match_int(args, &arg)) 1455 return -1; 1456 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) 1457 return -1; 1458 if (m->flags & MOPT_EXPLICIT) 1459 set_opt2(sb, EXPLICIT_DELALLOC); 1460 if (m->flags & MOPT_CLEAR_ERR) 1461 clear_opt(sb, ERRORS_MASK); 1462 if (token == Opt_noquota && sb_any_quota_loaded(sb)) { 1463 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1464 "options when quota turned on"); 1465 return -1; 1466 } 1467 1468 if (m->flags & MOPT_NOSUPPORT) { 1469 ext4_msg(sb, KERN_ERR, "%s option not supported", opt); 1470 } else if (token == Opt_commit) { 1471 if (arg == 0) 1472 arg = JBD2_DEFAULT_MAX_COMMIT_AGE; 1473 sbi->s_commit_interval = HZ * arg; 1474 } else if (token == Opt_max_batch_time) { 1475 if (arg == 0) 1476 arg = EXT4_DEF_MAX_BATCH_TIME; 1477 sbi->s_max_batch_time = arg; 1478 } else if (token == Opt_min_batch_time) { 1479 sbi->s_min_batch_time = arg; 1480 } else if (token == Opt_inode_readahead_blks) { 1481 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { 1482 ext4_msg(sb, KERN_ERR, 1483 "EXT4-fs: inode_readahead_blks must be " 1484 "0 or a power of 2 smaller than 2^31"); 1485 return -1; 1486 } 1487 sbi->s_inode_readahead_blks = arg; 1488 } else if (token == Opt_init_itable) { 1489 set_opt(sb, INIT_INODE_TABLE); 1490 if (!args->from) 1491 arg = EXT4_DEF_LI_WAIT_MULT; 1492 sbi->s_li_wait_mult = arg; 1493 } else if (token == Opt_max_dir_size_kb) { 1494 sbi->s_max_dir_size_kb = arg; 1495 } else if (token == Opt_stripe) { 1496 sbi->s_stripe = arg; 1497 } else if (token == Opt_resuid) { 1498 uid = make_kuid(current_user_ns(), arg); 1499 if (!uid_valid(uid)) { 1500 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); 1501 return -1; 1502 } 1503 sbi->s_resuid = uid; 1504 } else if (token == Opt_resgid) { 1505 gid = make_kgid(current_user_ns(), arg); 1506 if (!gid_valid(gid)) { 1507 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); 1508 return -1; 1509 } 1510 sbi->s_resgid = gid; 1511 } else if (token == Opt_journal_dev) { 1512 if (is_remount) { 1513 ext4_msg(sb, KERN_ERR, 1514 "Cannot specify journal on remount"); 1515 return -1; 1516 } 1517 *journal_devnum = arg; 1518 } else if (token == Opt_journal_ioprio) { 1519 if (arg > 7) { 1520 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" 1521 " (must be 0-7)"); 1522 return -1; 1523 } 1524 *journal_ioprio = 1525 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); 1526 } else if (m->flags & MOPT_DATAJ) { 1527 if (is_remount) { 1528 if (!sbi->s_journal) 1529 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); 1530 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) { 1531 ext4_msg(sb, KERN_ERR, 1532 "Cannot change data mode on remount"); 1533 return -1; 1534 } 1535 } else { 1536 clear_opt(sb, DATA_FLAGS); 1537 sbi->s_mount_opt |= m->mount_opt; 1538 } 1539 #ifdef CONFIG_QUOTA 1540 } else if (m->flags & MOPT_QFMT) { 1541 if (sb_any_quota_loaded(sb) && 1542 sbi->s_jquota_fmt != m->mount_opt) { 1543 ext4_msg(sb, KERN_ERR, "Cannot change journaled " 1544 "quota options when quota turned on"); 1545 return -1; 1546 } 1547 sbi->s_jquota_fmt = m->mount_opt; 1548 #endif 1549 } else { 1550 if (!args->from) 1551 arg = 1; 1552 if (m->flags & MOPT_CLEAR) 1553 arg = !arg; 1554 else if (unlikely(!(m->flags & MOPT_SET))) { 1555 ext4_msg(sb, KERN_WARNING, 1556 "buggy handling of option %s", opt); 1557 WARN_ON(1); 1558 return -1; 1559 } 1560 if (arg != 0) 1561 sbi->s_mount_opt |= m->mount_opt; 1562 else 1563 sbi->s_mount_opt &= ~m->mount_opt; 1564 } 1565 return 1; 1566 } 1567 1568 static int parse_options(char *options, struct super_block *sb, 1569 unsigned long *journal_devnum, 1570 unsigned int *journal_ioprio, 1571 int is_remount) 1572 { 1573 struct ext4_sb_info *sbi = EXT4_SB(sb); 1574 char *p; 1575 substring_t args[MAX_OPT_ARGS]; 1576 int token; 1577 1578 if (!options) 1579 return 1; 1580 1581 while ((p = strsep(&options, ",")) != NULL) { 1582 if (!*p) 1583 continue; 1584 /* 1585 * Initialize args struct so we know whether arg was 1586 * found; some options take optional arguments. 1587 */ 1588 args[0].to = args[0].from = NULL; 1589 token = match_token(p, tokens, args); 1590 if (handle_mount_opt(sb, p, token, args, journal_devnum, 1591 journal_ioprio, is_remount) < 0) 1592 return 0; 1593 } 1594 #ifdef CONFIG_QUOTA 1595 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1596 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1597 clear_opt(sb, USRQUOTA); 1598 1599 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1600 clear_opt(sb, GRPQUOTA); 1601 1602 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1603 ext4_msg(sb, KERN_ERR, "old and new quota " 1604 "format mixing"); 1605 return 0; 1606 } 1607 1608 if (!sbi->s_jquota_fmt) { 1609 ext4_msg(sb, KERN_ERR, "journaled quota format " 1610 "not specified"); 1611 return 0; 1612 } 1613 } else { 1614 if (sbi->s_jquota_fmt) { 1615 ext4_msg(sb, KERN_ERR, "journaled quota format " 1616 "specified with no journaling " 1617 "enabled"); 1618 return 0; 1619 } 1620 } 1621 #endif 1622 if (test_opt(sb, DIOREAD_NOLOCK)) { 1623 int blocksize = 1624 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 1625 1626 if (blocksize < PAGE_CACHE_SIZE) { 1627 ext4_msg(sb, KERN_ERR, "can't mount with " 1628 "dioread_nolock if block size != PAGE_SIZE"); 1629 return 0; 1630 } 1631 } 1632 return 1; 1633 } 1634 1635 static inline void ext4_show_quota_options(struct seq_file *seq, 1636 struct super_block *sb) 1637 { 1638 #if defined(CONFIG_QUOTA) 1639 struct ext4_sb_info *sbi = EXT4_SB(sb); 1640 1641 if (sbi->s_jquota_fmt) { 1642 char *fmtname = ""; 1643 1644 switch (sbi->s_jquota_fmt) { 1645 case QFMT_VFS_OLD: 1646 fmtname = "vfsold"; 1647 break; 1648 case QFMT_VFS_V0: 1649 fmtname = "vfsv0"; 1650 break; 1651 case QFMT_VFS_V1: 1652 fmtname = "vfsv1"; 1653 break; 1654 } 1655 seq_printf(seq, ",jqfmt=%s", fmtname); 1656 } 1657 1658 if (sbi->s_qf_names[USRQUOTA]) 1659 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 1660 1661 if (sbi->s_qf_names[GRPQUOTA]) 1662 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 1663 1664 if (test_opt(sb, USRQUOTA)) 1665 seq_puts(seq, ",usrquota"); 1666 1667 if (test_opt(sb, GRPQUOTA)) 1668 seq_puts(seq, ",grpquota"); 1669 #endif 1670 } 1671 1672 static const char *token2str(int token) 1673 { 1674 const struct match_token *t; 1675 1676 for (t = tokens; t->token != Opt_err; t++) 1677 if (t->token == token && !strchr(t->pattern, '=')) 1678 break; 1679 return t->pattern; 1680 } 1681 1682 /* 1683 * Show an option if 1684 * - it's set to a non-default value OR 1685 * - if the per-sb default is different from the global default 1686 */ 1687 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, 1688 int nodefs) 1689 { 1690 struct ext4_sb_info *sbi = EXT4_SB(sb); 1691 struct ext4_super_block *es = sbi->s_es; 1692 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; 1693 const struct mount_opts *m; 1694 char sep = nodefs ? '\n' : ','; 1695 1696 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) 1697 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) 1698 1699 if (sbi->s_sb_block != 1) 1700 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); 1701 1702 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 1703 int want_set = m->flags & MOPT_SET; 1704 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || 1705 (m->flags & MOPT_CLEAR_ERR)) 1706 continue; 1707 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) 1708 continue; /* skip if same as the default */ 1709 if ((want_set && 1710 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || 1711 (!want_set && (sbi->s_mount_opt & m->mount_opt))) 1712 continue; /* select Opt_noFoo vs Opt_Foo */ 1713 SEQ_OPTS_PRINT("%s", token2str(m->token)); 1714 } 1715 1716 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || 1717 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) 1718 SEQ_OPTS_PRINT("resuid=%u", 1719 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 1720 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || 1721 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) 1722 SEQ_OPTS_PRINT("resgid=%u", 1723 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 1724 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); 1725 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) 1726 SEQ_OPTS_PUTS("errors=remount-ro"); 1727 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 1728 SEQ_OPTS_PUTS("errors=continue"); 1729 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 1730 SEQ_OPTS_PUTS("errors=panic"); 1731 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 1732 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); 1733 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) 1734 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); 1735 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) 1736 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); 1737 if (sb->s_flags & MS_I_VERSION) 1738 SEQ_OPTS_PUTS("i_version"); 1739 if (nodefs || sbi->s_stripe) 1740 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); 1741 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { 1742 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1743 SEQ_OPTS_PUTS("data=journal"); 1744 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1745 SEQ_OPTS_PUTS("data=ordered"); 1746 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1747 SEQ_OPTS_PUTS("data=writeback"); 1748 } 1749 if (nodefs || 1750 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1751 SEQ_OPTS_PRINT("inode_readahead_blks=%u", 1752 sbi->s_inode_readahead_blks); 1753 1754 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && 1755 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) 1756 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); 1757 if (nodefs || sbi->s_max_dir_size_kb) 1758 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); 1759 1760 ext4_show_quota_options(seq, sb); 1761 return 0; 1762 } 1763 1764 static int ext4_show_options(struct seq_file *seq, struct dentry *root) 1765 { 1766 return _ext4_show_options(seq, root->d_sb, 0); 1767 } 1768 1769 static int options_seq_show(struct seq_file *seq, void *offset) 1770 { 1771 struct super_block *sb = seq->private; 1772 int rc; 1773 1774 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); 1775 rc = _ext4_show_options(seq, sb, 1); 1776 seq_puts(seq, "\n"); 1777 return rc; 1778 } 1779 1780 static int options_open_fs(struct inode *inode, struct file *file) 1781 { 1782 return single_open(file, options_seq_show, PDE(inode)->data); 1783 } 1784 1785 static const struct file_operations ext4_seq_options_fops = { 1786 .owner = THIS_MODULE, 1787 .open = options_open_fs, 1788 .read = seq_read, 1789 .llseek = seq_lseek, 1790 .release = single_release, 1791 }; 1792 1793 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1794 int read_only) 1795 { 1796 struct ext4_sb_info *sbi = EXT4_SB(sb); 1797 int res = 0; 1798 1799 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1800 ext4_msg(sb, KERN_ERR, "revision level too high, " 1801 "forcing read-only mode"); 1802 res = MS_RDONLY; 1803 } 1804 if (read_only) 1805 goto done; 1806 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1807 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1808 "running e2fsck is recommended"); 1809 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1810 ext4_msg(sb, KERN_WARNING, 1811 "warning: mounting fs with errors, " 1812 "running e2fsck is recommended"); 1813 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 1814 le16_to_cpu(es->s_mnt_count) >= 1815 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1816 ext4_msg(sb, KERN_WARNING, 1817 "warning: maximal mount count reached, " 1818 "running e2fsck is recommended"); 1819 else if (le32_to_cpu(es->s_checkinterval) && 1820 (le32_to_cpu(es->s_lastcheck) + 1821 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1822 ext4_msg(sb, KERN_WARNING, 1823 "warning: checktime reached, " 1824 "running e2fsck is recommended"); 1825 if (!sbi->s_journal) 1826 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1827 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1828 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1829 le16_add_cpu(&es->s_mnt_count, 1); 1830 es->s_mtime = cpu_to_le32(get_seconds()); 1831 ext4_update_dynamic_rev(sb); 1832 if (sbi->s_journal) 1833 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1834 1835 ext4_commit_super(sb, 1); 1836 done: 1837 if (test_opt(sb, DEBUG)) 1838 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1839 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 1840 sb->s_blocksize, 1841 sbi->s_groups_count, 1842 EXT4_BLOCKS_PER_GROUP(sb), 1843 EXT4_INODES_PER_GROUP(sb), 1844 sbi->s_mount_opt, sbi->s_mount_opt2); 1845 1846 cleancache_init_fs(sb); 1847 return res; 1848 } 1849 1850 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) 1851 { 1852 struct ext4_sb_info *sbi = EXT4_SB(sb); 1853 struct flex_groups *new_groups; 1854 int size; 1855 1856 if (!sbi->s_log_groups_per_flex) 1857 return 0; 1858 1859 size = ext4_flex_group(sbi, ngroup - 1) + 1; 1860 if (size <= sbi->s_flex_groups_allocated) 1861 return 0; 1862 1863 size = roundup_pow_of_two(size * sizeof(struct flex_groups)); 1864 new_groups = ext4_kvzalloc(size, GFP_KERNEL); 1865 if (!new_groups) { 1866 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", 1867 size / (int) sizeof(struct flex_groups)); 1868 return -ENOMEM; 1869 } 1870 1871 if (sbi->s_flex_groups) { 1872 memcpy(new_groups, sbi->s_flex_groups, 1873 (sbi->s_flex_groups_allocated * 1874 sizeof(struct flex_groups))); 1875 ext4_kvfree(sbi->s_flex_groups); 1876 } 1877 sbi->s_flex_groups = new_groups; 1878 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); 1879 return 0; 1880 } 1881 1882 static int ext4_fill_flex_info(struct super_block *sb) 1883 { 1884 struct ext4_sb_info *sbi = EXT4_SB(sb); 1885 struct ext4_group_desc *gdp = NULL; 1886 ext4_group_t flex_group; 1887 unsigned int groups_per_flex = 0; 1888 int i, err; 1889 1890 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1891 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 1892 sbi->s_log_groups_per_flex = 0; 1893 return 1; 1894 } 1895 groups_per_flex = 1U << sbi->s_log_groups_per_flex; 1896 1897 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); 1898 if (err) 1899 goto failed; 1900 1901 for (i = 0; i < sbi->s_groups_count; i++) { 1902 gdp = ext4_get_group_desc(sb, i, NULL); 1903 1904 flex_group = ext4_flex_group(sbi, i); 1905 atomic_add(ext4_free_inodes_count(sb, gdp), 1906 &sbi->s_flex_groups[flex_group].free_inodes); 1907 atomic_add(ext4_free_group_clusters(sb, gdp), 1908 &sbi->s_flex_groups[flex_group].free_clusters); 1909 atomic_add(ext4_used_dirs_count(sb, gdp), 1910 &sbi->s_flex_groups[flex_group].used_dirs); 1911 } 1912 1913 return 1; 1914 failed: 1915 return 0; 1916 } 1917 1918 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1919 struct ext4_group_desc *gdp) 1920 { 1921 int offset; 1922 __u16 crc = 0; 1923 __le32 le_group = cpu_to_le32(block_group); 1924 1925 if ((sbi->s_es->s_feature_ro_compat & 1926 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) { 1927 /* Use new metadata_csum algorithm */ 1928 __u16 old_csum; 1929 __u32 csum32; 1930 1931 old_csum = gdp->bg_checksum; 1932 gdp->bg_checksum = 0; 1933 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, 1934 sizeof(le_group)); 1935 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, 1936 sbi->s_desc_size); 1937 gdp->bg_checksum = old_csum; 1938 1939 crc = csum32 & 0xFFFF; 1940 goto out; 1941 } 1942 1943 /* old crc16 code */ 1944 offset = offsetof(struct ext4_group_desc, bg_checksum); 1945 1946 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1947 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1948 crc = crc16(crc, (__u8 *)gdp, offset); 1949 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1950 /* for checksum of struct ext4_group_desc do the rest...*/ 1951 if ((sbi->s_es->s_feature_incompat & 1952 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1953 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1954 crc = crc16(crc, (__u8 *)gdp + offset, 1955 le16_to_cpu(sbi->s_es->s_desc_size) - 1956 offset); 1957 1958 out: 1959 return cpu_to_le16(crc); 1960 } 1961 1962 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, 1963 struct ext4_group_desc *gdp) 1964 { 1965 if (ext4_has_group_desc_csum(sb) && 1966 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb), 1967 block_group, gdp))) 1968 return 0; 1969 1970 return 1; 1971 } 1972 1973 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, 1974 struct ext4_group_desc *gdp) 1975 { 1976 if (!ext4_has_group_desc_csum(sb)) 1977 return; 1978 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp); 1979 } 1980 1981 /* Called at mount-time, super-block is locked */ 1982 static int ext4_check_descriptors(struct super_block *sb, 1983 ext4_group_t *first_not_zeroed) 1984 { 1985 struct ext4_sb_info *sbi = EXT4_SB(sb); 1986 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1987 ext4_fsblk_t last_block; 1988 ext4_fsblk_t block_bitmap; 1989 ext4_fsblk_t inode_bitmap; 1990 ext4_fsblk_t inode_table; 1991 int flexbg_flag = 0; 1992 ext4_group_t i, grp = sbi->s_groups_count; 1993 1994 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1995 flexbg_flag = 1; 1996 1997 ext4_debug("Checking group descriptors"); 1998 1999 for (i = 0; i < sbi->s_groups_count; i++) { 2000 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2001 2002 if (i == sbi->s_groups_count - 1 || flexbg_flag) 2003 last_block = ext4_blocks_count(sbi->s_es) - 1; 2004 else 2005 last_block = first_block + 2006 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2007 2008 if ((grp == sbi->s_groups_count) && 2009 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2010 grp = i; 2011 2012 block_bitmap = ext4_block_bitmap(sb, gdp); 2013 if (block_bitmap < first_block || block_bitmap > last_block) { 2014 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2015 "Block bitmap for group %u not in group " 2016 "(block %llu)!", i, block_bitmap); 2017 return 0; 2018 } 2019 inode_bitmap = ext4_inode_bitmap(sb, gdp); 2020 if (inode_bitmap < first_block || inode_bitmap > last_block) { 2021 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2022 "Inode bitmap for group %u not in group " 2023 "(block %llu)!", i, inode_bitmap); 2024 return 0; 2025 } 2026 inode_table = ext4_inode_table(sb, gdp); 2027 if (inode_table < first_block || 2028 inode_table + sbi->s_itb_per_group - 1 > last_block) { 2029 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2030 "Inode table for group %u not in group " 2031 "(block %llu)!", i, inode_table); 2032 return 0; 2033 } 2034 ext4_lock_group(sb, i); 2035 if (!ext4_group_desc_csum_verify(sb, i, gdp)) { 2036 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2037 "Checksum for group %u failed (%u!=%u)", 2038 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 2039 gdp)), le16_to_cpu(gdp->bg_checksum)); 2040 if (!(sb->s_flags & MS_RDONLY)) { 2041 ext4_unlock_group(sb, i); 2042 return 0; 2043 } 2044 } 2045 ext4_unlock_group(sb, i); 2046 if (!flexbg_flag) 2047 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2048 } 2049 if (NULL != first_not_zeroed) 2050 *first_not_zeroed = grp; 2051 2052 ext4_free_blocks_count_set(sbi->s_es, 2053 EXT4_C2B(sbi, ext4_count_free_clusters(sb))); 2054 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 2055 return 1; 2056 } 2057 2058 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2059 * the superblock) which were deleted from all directories, but held open by 2060 * a process at the time of a crash. We walk the list and try to delete these 2061 * inodes at recovery time (only with a read-write filesystem). 2062 * 2063 * In order to keep the orphan inode chain consistent during traversal (in 2064 * case of crash during recovery), we link each inode into the superblock 2065 * orphan list_head and handle it the same way as an inode deletion during 2066 * normal operation (which journals the operations for us). 2067 * 2068 * We only do an iget() and an iput() on each inode, which is very safe if we 2069 * accidentally point at an in-use or already deleted inode. The worst that 2070 * can happen in this case is that we get a "bit already cleared" message from 2071 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2072 * e2fsck was run on this filesystem, and it must have already done the orphan 2073 * inode cleanup for us, so we can safely abort without any further action. 2074 */ 2075 static void ext4_orphan_cleanup(struct super_block *sb, 2076 struct ext4_super_block *es) 2077 { 2078 unsigned int s_flags = sb->s_flags; 2079 int nr_orphans = 0, nr_truncates = 0; 2080 #ifdef CONFIG_QUOTA 2081 int i; 2082 #endif 2083 if (!es->s_last_orphan) { 2084 jbd_debug(4, "no orphan inodes to clean up\n"); 2085 return; 2086 } 2087 2088 if (bdev_read_only(sb->s_bdev)) { 2089 ext4_msg(sb, KERN_ERR, "write access " 2090 "unavailable, skipping orphan cleanup"); 2091 return; 2092 } 2093 2094 /* Check if feature set would not allow a r/w mount */ 2095 if (!ext4_feature_set_ok(sb, 0)) { 2096 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2097 "unknown ROCOMPAT features"); 2098 return; 2099 } 2100 2101 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2102 /* don't clear list on RO mount w/ errors */ 2103 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { 2104 jbd_debug(1, "Errors on filesystem, " 2105 "clearing orphan list.\n"); 2106 es->s_last_orphan = 0; 2107 } 2108 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2109 return; 2110 } 2111 2112 if (s_flags & MS_RDONLY) { 2113 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2114 sb->s_flags &= ~MS_RDONLY; 2115 } 2116 #ifdef CONFIG_QUOTA 2117 /* Needed for iput() to work correctly and not trash data */ 2118 sb->s_flags |= MS_ACTIVE; 2119 /* Turn on quotas so that they are updated correctly */ 2120 for (i = 0; i < MAXQUOTAS; i++) { 2121 if (EXT4_SB(sb)->s_qf_names[i]) { 2122 int ret = ext4_quota_on_mount(sb, i); 2123 if (ret < 0) 2124 ext4_msg(sb, KERN_ERR, 2125 "Cannot turn on journaled " 2126 "quota: error %d", ret); 2127 } 2128 } 2129 #endif 2130 2131 while (es->s_last_orphan) { 2132 struct inode *inode; 2133 2134 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2135 if (IS_ERR(inode)) { 2136 es->s_last_orphan = 0; 2137 break; 2138 } 2139 2140 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2141 dquot_initialize(inode); 2142 if (inode->i_nlink) { 2143 ext4_msg(sb, KERN_DEBUG, 2144 "%s: truncating inode %lu to %lld bytes", 2145 __func__, inode->i_ino, inode->i_size); 2146 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2147 inode->i_ino, inode->i_size); 2148 mutex_lock(&inode->i_mutex); 2149 ext4_truncate(inode); 2150 mutex_unlock(&inode->i_mutex); 2151 nr_truncates++; 2152 } else { 2153 ext4_msg(sb, KERN_DEBUG, 2154 "%s: deleting unreferenced inode %lu", 2155 __func__, inode->i_ino); 2156 jbd_debug(2, "deleting unreferenced inode %lu\n", 2157 inode->i_ino); 2158 nr_orphans++; 2159 } 2160 iput(inode); /* The delete magic happens here! */ 2161 } 2162 2163 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2164 2165 if (nr_orphans) 2166 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2167 PLURAL(nr_orphans)); 2168 if (nr_truncates) 2169 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2170 PLURAL(nr_truncates)); 2171 #ifdef CONFIG_QUOTA 2172 /* Turn quotas off */ 2173 for (i = 0; i < MAXQUOTAS; i++) { 2174 if (sb_dqopt(sb)->files[i]) 2175 dquot_quota_off(sb, i); 2176 } 2177 #endif 2178 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2179 } 2180 2181 /* 2182 * Maximal extent format file size. 2183 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2184 * extent format containers, within a sector_t, and within i_blocks 2185 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2186 * so that won't be a limiting factor. 2187 * 2188 * However there is other limiting factor. We do store extents in the form 2189 * of starting block and length, hence the resulting length of the extent 2190 * covering maximum file size must fit into on-disk format containers as 2191 * well. Given that length is always by 1 unit bigger than max unit (because 2192 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2193 * 2194 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2195 */ 2196 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2197 { 2198 loff_t res; 2199 loff_t upper_limit = MAX_LFS_FILESIZE; 2200 2201 /* small i_blocks in vfs inode? */ 2202 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2203 /* 2204 * CONFIG_LBDAF is not enabled implies the inode 2205 * i_block represent total blocks in 512 bytes 2206 * 32 == size of vfs inode i_blocks * 8 2207 */ 2208 upper_limit = (1LL << 32) - 1; 2209 2210 /* total blocks in file system block size */ 2211 upper_limit >>= (blkbits - 9); 2212 upper_limit <<= blkbits; 2213 } 2214 2215 /* 2216 * 32-bit extent-start container, ee_block. We lower the maxbytes 2217 * by one fs block, so ee_len can cover the extent of maximum file 2218 * size 2219 */ 2220 res = (1LL << 32) - 1; 2221 res <<= blkbits; 2222 2223 /* Sanity check against vm- & vfs- imposed limits */ 2224 if (res > upper_limit) 2225 res = upper_limit; 2226 2227 return res; 2228 } 2229 2230 /* 2231 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2232 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2233 * We need to be 1 filesystem block less than the 2^48 sector limit. 2234 */ 2235 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2236 { 2237 loff_t res = EXT4_NDIR_BLOCKS; 2238 int meta_blocks; 2239 loff_t upper_limit; 2240 /* This is calculated to be the largest file size for a dense, block 2241 * mapped file such that the file's total number of 512-byte sectors, 2242 * including data and all indirect blocks, does not exceed (2^48 - 1). 2243 * 2244 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2245 * number of 512-byte sectors of the file. 2246 */ 2247 2248 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2249 /* 2250 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2251 * the inode i_block field represents total file blocks in 2252 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2253 */ 2254 upper_limit = (1LL << 32) - 1; 2255 2256 /* total blocks in file system block size */ 2257 upper_limit >>= (bits - 9); 2258 2259 } else { 2260 /* 2261 * We use 48 bit ext4_inode i_blocks 2262 * With EXT4_HUGE_FILE_FL set the i_blocks 2263 * represent total number of blocks in 2264 * file system block size 2265 */ 2266 upper_limit = (1LL << 48) - 1; 2267 2268 } 2269 2270 /* indirect blocks */ 2271 meta_blocks = 1; 2272 /* double indirect blocks */ 2273 meta_blocks += 1 + (1LL << (bits-2)); 2274 /* tripple indirect blocks */ 2275 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2276 2277 upper_limit -= meta_blocks; 2278 upper_limit <<= bits; 2279 2280 res += 1LL << (bits-2); 2281 res += 1LL << (2*(bits-2)); 2282 res += 1LL << (3*(bits-2)); 2283 res <<= bits; 2284 if (res > upper_limit) 2285 res = upper_limit; 2286 2287 if (res > MAX_LFS_FILESIZE) 2288 res = MAX_LFS_FILESIZE; 2289 2290 return res; 2291 } 2292 2293 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2294 ext4_fsblk_t logical_sb_block, int nr) 2295 { 2296 struct ext4_sb_info *sbi = EXT4_SB(sb); 2297 ext4_group_t bg, first_meta_bg; 2298 int has_super = 0; 2299 2300 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2301 2302 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2303 nr < first_meta_bg) 2304 return logical_sb_block + nr + 1; 2305 bg = sbi->s_desc_per_block * nr; 2306 if (ext4_bg_has_super(sb, bg)) 2307 has_super = 1; 2308 2309 return (has_super + ext4_group_first_block_no(sb, bg)); 2310 } 2311 2312 /** 2313 * ext4_get_stripe_size: Get the stripe size. 2314 * @sbi: In memory super block info 2315 * 2316 * If we have specified it via mount option, then 2317 * use the mount option value. If the value specified at mount time is 2318 * greater than the blocks per group use the super block value. 2319 * If the super block value is greater than blocks per group return 0. 2320 * Allocator needs it be less than blocks per group. 2321 * 2322 */ 2323 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2324 { 2325 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2326 unsigned long stripe_width = 2327 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2328 int ret; 2329 2330 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2331 ret = sbi->s_stripe; 2332 else if (stripe_width <= sbi->s_blocks_per_group) 2333 ret = stripe_width; 2334 else if (stride <= sbi->s_blocks_per_group) 2335 ret = stride; 2336 else 2337 ret = 0; 2338 2339 /* 2340 * If the stripe width is 1, this makes no sense and 2341 * we set it to 0 to turn off stripe handling code. 2342 */ 2343 if (ret <= 1) 2344 ret = 0; 2345 2346 return ret; 2347 } 2348 2349 /* sysfs supprt */ 2350 2351 struct ext4_attr { 2352 struct attribute attr; 2353 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 2354 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 2355 const char *, size_t); 2356 int offset; 2357 }; 2358 2359 static int parse_strtoul(const char *buf, 2360 unsigned long max, unsigned long *value) 2361 { 2362 char *endp; 2363 2364 *value = simple_strtoul(skip_spaces(buf), &endp, 0); 2365 endp = skip_spaces(endp); 2366 if (*endp || *value > max) 2367 return -EINVAL; 2368 2369 return 0; 2370 } 2371 2372 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 2373 struct ext4_sb_info *sbi, 2374 char *buf) 2375 { 2376 return snprintf(buf, PAGE_SIZE, "%llu\n", 2377 (s64) EXT4_C2B(sbi, 2378 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 2379 } 2380 2381 static ssize_t session_write_kbytes_show(struct ext4_attr *a, 2382 struct ext4_sb_info *sbi, char *buf) 2383 { 2384 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2385 2386 if (!sb->s_bdev->bd_part) 2387 return snprintf(buf, PAGE_SIZE, "0\n"); 2388 return snprintf(buf, PAGE_SIZE, "%lu\n", 2389 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2390 sbi->s_sectors_written_start) >> 1); 2391 } 2392 2393 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 2394 struct ext4_sb_info *sbi, char *buf) 2395 { 2396 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2397 2398 if (!sb->s_bdev->bd_part) 2399 return snprintf(buf, PAGE_SIZE, "0\n"); 2400 return snprintf(buf, PAGE_SIZE, "%llu\n", 2401 (unsigned long long)(sbi->s_kbytes_written + 2402 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2403 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 2404 } 2405 2406 static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 2407 struct ext4_sb_info *sbi, 2408 const char *buf, size_t count) 2409 { 2410 unsigned long t; 2411 2412 if (parse_strtoul(buf, 0x40000000, &t)) 2413 return -EINVAL; 2414 2415 if (t && !is_power_of_2(t)) 2416 return -EINVAL; 2417 2418 sbi->s_inode_readahead_blks = t; 2419 return count; 2420 } 2421 2422 static ssize_t sbi_ui_show(struct ext4_attr *a, 2423 struct ext4_sb_info *sbi, char *buf) 2424 { 2425 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2426 2427 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 2428 } 2429 2430 static ssize_t sbi_ui_store(struct ext4_attr *a, 2431 struct ext4_sb_info *sbi, 2432 const char *buf, size_t count) 2433 { 2434 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2435 unsigned long t; 2436 2437 if (parse_strtoul(buf, 0xffffffff, &t)) 2438 return -EINVAL; 2439 *ui = t; 2440 return count; 2441 } 2442 2443 static ssize_t trigger_test_error(struct ext4_attr *a, 2444 struct ext4_sb_info *sbi, 2445 const char *buf, size_t count) 2446 { 2447 int len = count; 2448 2449 if (!capable(CAP_SYS_ADMIN)) 2450 return -EPERM; 2451 2452 if (len && buf[len-1] == '\n') 2453 len--; 2454 2455 if (len) 2456 ext4_error(sbi->s_sb, "%.*s", len, buf); 2457 return count; 2458 } 2459 2460 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 2461 static struct ext4_attr ext4_attr_##_name = { \ 2462 .attr = {.name = __stringify(_name), .mode = _mode }, \ 2463 .show = _show, \ 2464 .store = _store, \ 2465 .offset = offsetof(struct ext4_sb_info, _elname), \ 2466 } 2467 #define EXT4_ATTR(name, mode, show, store) \ 2468 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 2469 2470 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) 2471 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 2472 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 2473 #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 2474 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 2475 #define ATTR_LIST(name) &ext4_attr_##name.attr 2476 2477 EXT4_RO_ATTR(delayed_allocation_blocks); 2478 EXT4_RO_ATTR(session_write_kbytes); 2479 EXT4_RO_ATTR(lifetime_write_kbytes); 2480 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 2481 inode_readahead_blks_store, s_inode_readahead_blks); 2482 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 2483 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 2484 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 2485 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 2486 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 2487 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 2488 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 2489 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); 2490 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); 2491 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error); 2492 2493 static struct attribute *ext4_attrs[] = { 2494 ATTR_LIST(delayed_allocation_blocks), 2495 ATTR_LIST(session_write_kbytes), 2496 ATTR_LIST(lifetime_write_kbytes), 2497 ATTR_LIST(inode_readahead_blks), 2498 ATTR_LIST(inode_goal), 2499 ATTR_LIST(mb_stats), 2500 ATTR_LIST(mb_max_to_scan), 2501 ATTR_LIST(mb_min_to_scan), 2502 ATTR_LIST(mb_order2_req), 2503 ATTR_LIST(mb_stream_req), 2504 ATTR_LIST(mb_group_prealloc), 2505 ATTR_LIST(max_writeback_mb_bump), 2506 ATTR_LIST(extent_max_zeroout_kb), 2507 ATTR_LIST(trigger_fs_error), 2508 NULL, 2509 }; 2510 2511 /* Features this copy of ext4 supports */ 2512 EXT4_INFO_ATTR(lazy_itable_init); 2513 EXT4_INFO_ATTR(batched_discard); 2514 EXT4_INFO_ATTR(meta_bg_resize); 2515 2516 static struct attribute *ext4_feat_attrs[] = { 2517 ATTR_LIST(lazy_itable_init), 2518 ATTR_LIST(batched_discard), 2519 ATTR_LIST(meta_bg_resize), 2520 NULL, 2521 }; 2522 2523 static ssize_t ext4_attr_show(struct kobject *kobj, 2524 struct attribute *attr, char *buf) 2525 { 2526 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2527 s_kobj); 2528 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2529 2530 return a->show ? a->show(a, sbi, buf) : 0; 2531 } 2532 2533 static ssize_t ext4_attr_store(struct kobject *kobj, 2534 struct attribute *attr, 2535 const char *buf, size_t len) 2536 { 2537 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2538 s_kobj); 2539 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2540 2541 return a->store ? a->store(a, sbi, buf, len) : 0; 2542 } 2543 2544 static void ext4_sb_release(struct kobject *kobj) 2545 { 2546 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2547 s_kobj); 2548 complete(&sbi->s_kobj_unregister); 2549 } 2550 2551 static const struct sysfs_ops ext4_attr_ops = { 2552 .show = ext4_attr_show, 2553 .store = ext4_attr_store, 2554 }; 2555 2556 static struct kobj_type ext4_ktype = { 2557 .default_attrs = ext4_attrs, 2558 .sysfs_ops = &ext4_attr_ops, 2559 .release = ext4_sb_release, 2560 }; 2561 2562 static void ext4_feat_release(struct kobject *kobj) 2563 { 2564 complete(&ext4_feat->f_kobj_unregister); 2565 } 2566 2567 static struct kobj_type ext4_feat_ktype = { 2568 .default_attrs = ext4_feat_attrs, 2569 .sysfs_ops = &ext4_attr_ops, 2570 .release = ext4_feat_release, 2571 }; 2572 2573 /* 2574 * Check whether this filesystem can be mounted based on 2575 * the features present and the RDONLY/RDWR mount requested. 2576 * Returns 1 if this filesystem can be mounted as requested, 2577 * 0 if it cannot be. 2578 */ 2579 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2580 { 2581 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2582 ext4_msg(sb, KERN_ERR, 2583 "Couldn't mount because of " 2584 "unsupported optional features (%x)", 2585 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2586 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2587 return 0; 2588 } 2589 2590 if (readonly) 2591 return 1; 2592 2593 /* Check that feature set is OK for a read-write mount */ 2594 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2595 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2596 "unsupported optional features (%x)", 2597 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2598 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2599 return 0; 2600 } 2601 /* 2602 * Large file size enabled file system can only be mounted 2603 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2604 */ 2605 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2606 if (sizeof(blkcnt_t) < sizeof(u64)) { 2607 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2608 "cannot be mounted RDWR without " 2609 "CONFIG_LBDAF"); 2610 return 0; 2611 } 2612 } 2613 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) && 2614 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 2615 ext4_msg(sb, KERN_ERR, 2616 "Can't support bigalloc feature without " 2617 "extents feature\n"); 2618 return 0; 2619 } 2620 2621 #ifndef CONFIG_QUOTA 2622 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && 2623 !readonly) { 2624 ext4_msg(sb, KERN_ERR, 2625 "Filesystem with quota feature cannot be mounted RDWR " 2626 "without CONFIG_QUOTA"); 2627 return 0; 2628 } 2629 #endif /* CONFIG_QUOTA */ 2630 return 1; 2631 } 2632 2633 /* 2634 * This function is called once a day if we have errors logged 2635 * on the file system 2636 */ 2637 static void print_daily_error_info(unsigned long arg) 2638 { 2639 struct super_block *sb = (struct super_block *) arg; 2640 struct ext4_sb_info *sbi; 2641 struct ext4_super_block *es; 2642 2643 sbi = EXT4_SB(sb); 2644 es = sbi->s_es; 2645 2646 if (es->s_error_count) 2647 ext4_msg(sb, KERN_NOTICE, "error count: %u", 2648 le32_to_cpu(es->s_error_count)); 2649 if (es->s_first_error_time) { 2650 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", 2651 sb->s_id, le32_to_cpu(es->s_first_error_time), 2652 (int) sizeof(es->s_first_error_func), 2653 es->s_first_error_func, 2654 le32_to_cpu(es->s_first_error_line)); 2655 if (es->s_first_error_ino) 2656 printk(": inode %u", 2657 le32_to_cpu(es->s_first_error_ino)); 2658 if (es->s_first_error_block) 2659 printk(": block %llu", (unsigned long long) 2660 le64_to_cpu(es->s_first_error_block)); 2661 printk("\n"); 2662 } 2663 if (es->s_last_error_time) { 2664 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", 2665 sb->s_id, le32_to_cpu(es->s_last_error_time), 2666 (int) sizeof(es->s_last_error_func), 2667 es->s_last_error_func, 2668 le32_to_cpu(es->s_last_error_line)); 2669 if (es->s_last_error_ino) 2670 printk(": inode %u", 2671 le32_to_cpu(es->s_last_error_ino)); 2672 if (es->s_last_error_block) 2673 printk(": block %llu", (unsigned long long) 2674 le64_to_cpu(es->s_last_error_block)); 2675 printk("\n"); 2676 } 2677 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2678 } 2679 2680 /* Find next suitable group and run ext4_init_inode_table */ 2681 static int ext4_run_li_request(struct ext4_li_request *elr) 2682 { 2683 struct ext4_group_desc *gdp = NULL; 2684 ext4_group_t group, ngroups; 2685 struct super_block *sb; 2686 unsigned long timeout = 0; 2687 int ret = 0; 2688 2689 sb = elr->lr_super; 2690 ngroups = EXT4_SB(sb)->s_groups_count; 2691 2692 sb_start_write(sb); 2693 for (group = elr->lr_next_group; group < ngroups; group++) { 2694 gdp = ext4_get_group_desc(sb, group, NULL); 2695 if (!gdp) { 2696 ret = 1; 2697 break; 2698 } 2699 2700 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2701 break; 2702 } 2703 2704 if (group >= ngroups) 2705 ret = 1; 2706 2707 if (!ret) { 2708 timeout = jiffies; 2709 ret = ext4_init_inode_table(sb, group, 2710 elr->lr_timeout ? 0 : 1); 2711 if (elr->lr_timeout == 0) { 2712 timeout = (jiffies - timeout) * 2713 elr->lr_sbi->s_li_wait_mult; 2714 elr->lr_timeout = timeout; 2715 } 2716 elr->lr_next_sched = jiffies + elr->lr_timeout; 2717 elr->lr_next_group = group + 1; 2718 } 2719 sb_end_write(sb); 2720 2721 return ret; 2722 } 2723 2724 /* 2725 * Remove lr_request from the list_request and free the 2726 * request structure. Should be called with li_list_mtx held 2727 */ 2728 static void ext4_remove_li_request(struct ext4_li_request *elr) 2729 { 2730 struct ext4_sb_info *sbi; 2731 2732 if (!elr) 2733 return; 2734 2735 sbi = elr->lr_sbi; 2736 2737 list_del(&elr->lr_request); 2738 sbi->s_li_request = NULL; 2739 kfree(elr); 2740 } 2741 2742 static void ext4_unregister_li_request(struct super_block *sb) 2743 { 2744 mutex_lock(&ext4_li_mtx); 2745 if (!ext4_li_info) { 2746 mutex_unlock(&ext4_li_mtx); 2747 return; 2748 } 2749 2750 mutex_lock(&ext4_li_info->li_list_mtx); 2751 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2752 mutex_unlock(&ext4_li_info->li_list_mtx); 2753 mutex_unlock(&ext4_li_mtx); 2754 } 2755 2756 static struct task_struct *ext4_lazyinit_task; 2757 2758 /* 2759 * This is the function where ext4lazyinit thread lives. It walks 2760 * through the request list searching for next scheduled filesystem. 2761 * When such a fs is found, run the lazy initialization request 2762 * (ext4_rn_li_request) and keep track of the time spend in this 2763 * function. Based on that time we compute next schedule time of 2764 * the request. When walking through the list is complete, compute 2765 * next waking time and put itself into sleep. 2766 */ 2767 static int ext4_lazyinit_thread(void *arg) 2768 { 2769 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2770 struct list_head *pos, *n; 2771 struct ext4_li_request *elr; 2772 unsigned long next_wakeup, cur; 2773 2774 BUG_ON(NULL == eli); 2775 2776 cont_thread: 2777 while (true) { 2778 next_wakeup = MAX_JIFFY_OFFSET; 2779 2780 mutex_lock(&eli->li_list_mtx); 2781 if (list_empty(&eli->li_request_list)) { 2782 mutex_unlock(&eli->li_list_mtx); 2783 goto exit_thread; 2784 } 2785 2786 list_for_each_safe(pos, n, &eli->li_request_list) { 2787 elr = list_entry(pos, struct ext4_li_request, 2788 lr_request); 2789 2790 if (time_after_eq(jiffies, elr->lr_next_sched)) { 2791 if (ext4_run_li_request(elr) != 0) { 2792 /* error, remove the lazy_init job */ 2793 ext4_remove_li_request(elr); 2794 continue; 2795 } 2796 } 2797 2798 if (time_before(elr->lr_next_sched, next_wakeup)) 2799 next_wakeup = elr->lr_next_sched; 2800 } 2801 mutex_unlock(&eli->li_list_mtx); 2802 2803 try_to_freeze(); 2804 2805 cur = jiffies; 2806 if ((time_after_eq(cur, next_wakeup)) || 2807 (MAX_JIFFY_OFFSET == next_wakeup)) { 2808 cond_resched(); 2809 continue; 2810 } 2811 2812 schedule_timeout_interruptible(next_wakeup - cur); 2813 2814 if (kthread_should_stop()) { 2815 ext4_clear_request_list(); 2816 goto exit_thread; 2817 } 2818 } 2819 2820 exit_thread: 2821 /* 2822 * It looks like the request list is empty, but we need 2823 * to check it under the li_list_mtx lock, to prevent any 2824 * additions into it, and of course we should lock ext4_li_mtx 2825 * to atomically free the list and ext4_li_info, because at 2826 * this point another ext4 filesystem could be registering 2827 * new one. 2828 */ 2829 mutex_lock(&ext4_li_mtx); 2830 mutex_lock(&eli->li_list_mtx); 2831 if (!list_empty(&eli->li_request_list)) { 2832 mutex_unlock(&eli->li_list_mtx); 2833 mutex_unlock(&ext4_li_mtx); 2834 goto cont_thread; 2835 } 2836 mutex_unlock(&eli->li_list_mtx); 2837 kfree(ext4_li_info); 2838 ext4_li_info = NULL; 2839 mutex_unlock(&ext4_li_mtx); 2840 2841 return 0; 2842 } 2843 2844 static void ext4_clear_request_list(void) 2845 { 2846 struct list_head *pos, *n; 2847 struct ext4_li_request *elr; 2848 2849 mutex_lock(&ext4_li_info->li_list_mtx); 2850 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 2851 elr = list_entry(pos, struct ext4_li_request, 2852 lr_request); 2853 ext4_remove_li_request(elr); 2854 } 2855 mutex_unlock(&ext4_li_info->li_list_mtx); 2856 } 2857 2858 static int ext4_run_lazyinit_thread(void) 2859 { 2860 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 2861 ext4_li_info, "ext4lazyinit"); 2862 if (IS_ERR(ext4_lazyinit_task)) { 2863 int err = PTR_ERR(ext4_lazyinit_task); 2864 ext4_clear_request_list(); 2865 kfree(ext4_li_info); 2866 ext4_li_info = NULL; 2867 printk(KERN_CRIT "EXT4-fs: error %d creating inode table " 2868 "initialization thread\n", 2869 err); 2870 return err; 2871 } 2872 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 2873 return 0; 2874 } 2875 2876 /* 2877 * Check whether it make sense to run itable init. thread or not. 2878 * If there is at least one uninitialized inode table, return 2879 * corresponding group number, else the loop goes through all 2880 * groups and return total number of groups. 2881 */ 2882 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 2883 { 2884 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 2885 struct ext4_group_desc *gdp = NULL; 2886 2887 for (group = 0; group < ngroups; group++) { 2888 gdp = ext4_get_group_desc(sb, group, NULL); 2889 if (!gdp) 2890 continue; 2891 2892 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2893 break; 2894 } 2895 2896 return group; 2897 } 2898 2899 static int ext4_li_info_new(void) 2900 { 2901 struct ext4_lazy_init *eli = NULL; 2902 2903 eli = kzalloc(sizeof(*eli), GFP_KERNEL); 2904 if (!eli) 2905 return -ENOMEM; 2906 2907 INIT_LIST_HEAD(&eli->li_request_list); 2908 mutex_init(&eli->li_list_mtx); 2909 2910 eli->li_state |= EXT4_LAZYINIT_QUIT; 2911 2912 ext4_li_info = eli; 2913 2914 return 0; 2915 } 2916 2917 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 2918 ext4_group_t start) 2919 { 2920 struct ext4_sb_info *sbi = EXT4_SB(sb); 2921 struct ext4_li_request *elr; 2922 unsigned long rnd; 2923 2924 elr = kzalloc(sizeof(*elr), GFP_KERNEL); 2925 if (!elr) 2926 return NULL; 2927 2928 elr->lr_super = sb; 2929 elr->lr_sbi = sbi; 2930 elr->lr_next_group = start; 2931 2932 /* 2933 * Randomize first schedule time of the request to 2934 * spread the inode table initialization requests 2935 * better. 2936 */ 2937 get_random_bytes(&rnd, sizeof(rnd)); 2938 elr->lr_next_sched = jiffies + (unsigned long)rnd % 2939 (EXT4_DEF_LI_MAX_START_DELAY * HZ); 2940 2941 return elr; 2942 } 2943 2944 int ext4_register_li_request(struct super_block *sb, 2945 ext4_group_t first_not_zeroed) 2946 { 2947 struct ext4_sb_info *sbi = EXT4_SB(sb); 2948 struct ext4_li_request *elr = NULL; 2949 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2950 int ret = 0; 2951 2952 mutex_lock(&ext4_li_mtx); 2953 if (sbi->s_li_request != NULL) { 2954 /* 2955 * Reset timeout so it can be computed again, because 2956 * s_li_wait_mult might have changed. 2957 */ 2958 sbi->s_li_request->lr_timeout = 0; 2959 goto out; 2960 } 2961 2962 if (first_not_zeroed == ngroups || 2963 (sb->s_flags & MS_RDONLY) || 2964 !test_opt(sb, INIT_INODE_TABLE)) 2965 goto out; 2966 2967 elr = ext4_li_request_new(sb, first_not_zeroed); 2968 if (!elr) { 2969 ret = -ENOMEM; 2970 goto out; 2971 } 2972 2973 if (NULL == ext4_li_info) { 2974 ret = ext4_li_info_new(); 2975 if (ret) 2976 goto out; 2977 } 2978 2979 mutex_lock(&ext4_li_info->li_list_mtx); 2980 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 2981 mutex_unlock(&ext4_li_info->li_list_mtx); 2982 2983 sbi->s_li_request = elr; 2984 /* 2985 * set elr to NULL here since it has been inserted to 2986 * the request_list and the removal and free of it is 2987 * handled by ext4_clear_request_list from now on. 2988 */ 2989 elr = NULL; 2990 2991 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 2992 ret = ext4_run_lazyinit_thread(); 2993 if (ret) 2994 goto out; 2995 } 2996 out: 2997 mutex_unlock(&ext4_li_mtx); 2998 if (ret) 2999 kfree(elr); 3000 return ret; 3001 } 3002 3003 /* 3004 * We do not need to lock anything since this is called on 3005 * module unload. 3006 */ 3007 static void ext4_destroy_lazyinit_thread(void) 3008 { 3009 /* 3010 * If thread exited earlier 3011 * there's nothing to be done. 3012 */ 3013 if (!ext4_li_info || !ext4_lazyinit_task) 3014 return; 3015 3016 kthread_stop(ext4_lazyinit_task); 3017 } 3018 3019 static int set_journal_csum_feature_set(struct super_block *sb) 3020 { 3021 int ret = 1; 3022 int compat, incompat; 3023 struct ext4_sb_info *sbi = EXT4_SB(sb); 3024 3025 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3026 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 3027 /* journal checksum v2 */ 3028 compat = 0; 3029 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2; 3030 } else { 3031 /* journal checksum v1 */ 3032 compat = JBD2_FEATURE_COMPAT_CHECKSUM; 3033 incompat = 0; 3034 } 3035 3036 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3037 ret = jbd2_journal_set_features(sbi->s_journal, 3038 compat, 0, 3039 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 3040 incompat); 3041 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 3042 ret = jbd2_journal_set_features(sbi->s_journal, 3043 compat, 0, 3044 incompat); 3045 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3046 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3047 } else { 3048 jbd2_journal_clear_features(sbi->s_journal, 3049 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3050 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 3051 JBD2_FEATURE_INCOMPAT_CSUM_V2); 3052 } 3053 3054 return ret; 3055 } 3056 3057 /* 3058 * Note: calculating the overhead so we can be compatible with 3059 * historical BSD practice is quite difficult in the face of 3060 * clusters/bigalloc. This is because multiple metadata blocks from 3061 * different block group can end up in the same allocation cluster. 3062 * Calculating the exact overhead in the face of clustered allocation 3063 * requires either O(all block bitmaps) in memory or O(number of block 3064 * groups**2) in time. We will still calculate the superblock for 3065 * older file systems --- and if we come across with a bigalloc file 3066 * system with zero in s_overhead_clusters the estimate will be close to 3067 * correct especially for very large cluster sizes --- but for newer 3068 * file systems, it's better to calculate this figure once at mkfs 3069 * time, and store it in the superblock. If the superblock value is 3070 * present (even for non-bigalloc file systems), we will use it. 3071 */ 3072 static int count_overhead(struct super_block *sb, ext4_group_t grp, 3073 char *buf) 3074 { 3075 struct ext4_sb_info *sbi = EXT4_SB(sb); 3076 struct ext4_group_desc *gdp; 3077 ext4_fsblk_t first_block, last_block, b; 3078 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3079 int s, j, count = 0; 3080 3081 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) 3082 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + 3083 sbi->s_itb_per_group + 2); 3084 3085 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + 3086 (grp * EXT4_BLOCKS_PER_GROUP(sb)); 3087 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; 3088 for (i = 0; i < ngroups; i++) { 3089 gdp = ext4_get_group_desc(sb, i, NULL); 3090 b = ext4_block_bitmap(sb, gdp); 3091 if (b >= first_block && b <= last_block) { 3092 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3093 count++; 3094 } 3095 b = ext4_inode_bitmap(sb, gdp); 3096 if (b >= first_block && b <= last_block) { 3097 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3098 count++; 3099 } 3100 b = ext4_inode_table(sb, gdp); 3101 if (b >= first_block && b + sbi->s_itb_per_group <= last_block) 3102 for (j = 0; j < sbi->s_itb_per_group; j++, b++) { 3103 int c = EXT4_B2C(sbi, b - first_block); 3104 ext4_set_bit(c, buf); 3105 count++; 3106 } 3107 if (i != grp) 3108 continue; 3109 s = 0; 3110 if (ext4_bg_has_super(sb, grp)) { 3111 ext4_set_bit(s++, buf); 3112 count++; 3113 } 3114 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { 3115 ext4_set_bit(EXT4_B2C(sbi, s++), buf); 3116 count++; 3117 } 3118 } 3119 if (!count) 3120 return 0; 3121 return EXT4_CLUSTERS_PER_GROUP(sb) - 3122 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); 3123 } 3124 3125 /* 3126 * Compute the overhead and stash it in sbi->s_overhead 3127 */ 3128 int ext4_calculate_overhead(struct super_block *sb) 3129 { 3130 struct ext4_sb_info *sbi = EXT4_SB(sb); 3131 struct ext4_super_block *es = sbi->s_es; 3132 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3133 ext4_fsblk_t overhead = 0; 3134 char *buf = (char *) get_zeroed_page(GFP_KERNEL); 3135 3136 if (!buf) 3137 return -ENOMEM; 3138 3139 /* 3140 * Compute the overhead (FS structures). This is constant 3141 * for a given filesystem unless the number of block groups 3142 * changes so we cache the previous value until it does. 3143 */ 3144 3145 /* 3146 * All of the blocks before first_data_block are overhead 3147 */ 3148 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 3149 3150 /* 3151 * Add the overhead found in each block group 3152 */ 3153 for (i = 0; i < ngroups; i++) { 3154 int blks; 3155 3156 blks = count_overhead(sb, i, buf); 3157 overhead += blks; 3158 if (blks) 3159 memset(buf, 0, PAGE_SIZE); 3160 cond_resched(); 3161 } 3162 /* Add the journal blocks as well */ 3163 if (sbi->s_journal) 3164 overhead += EXT4_B2C(sbi, sbi->s_journal->j_maxlen); 3165 3166 sbi->s_overhead = overhead; 3167 smp_wmb(); 3168 free_page((unsigned long) buf); 3169 return 0; 3170 } 3171 3172 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3173 { 3174 char *orig_data = kstrdup(data, GFP_KERNEL); 3175 struct buffer_head *bh; 3176 struct ext4_super_block *es = NULL; 3177 struct ext4_sb_info *sbi; 3178 ext4_fsblk_t block; 3179 ext4_fsblk_t sb_block = get_sb_block(&data); 3180 ext4_fsblk_t logical_sb_block; 3181 unsigned long offset = 0; 3182 unsigned long journal_devnum = 0; 3183 unsigned long def_mount_opts; 3184 struct inode *root; 3185 char *cp; 3186 const char *descr; 3187 int ret = -ENOMEM; 3188 int blocksize, clustersize; 3189 unsigned int db_count; 3190 unsigned int i; 3191 int needs_recovery, has_huge_files, has_bigalloc; 3192 __u64 blocks_count; 3193 int err = 0; 3194 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3195 ext4_group_t first_not_zeroed; 3196 3197 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3198 if (!sbi) 3199 goto out_free_orig; 3200 3201 sbi->s_blockgroup_lock = 3202 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3203 if (!sbi->s_blockgroup_lock) { 3204 kfree(sbi); 3205 goto out_free_orig; 3206 } 3207 sb->s_fs_info = sbi; 3208 sbi->s_sb = sb; 3209 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3210 sbi->s_sb_block = sb_block; 3211 if (sb->s_bdev->bd_part) 3212 sbi->s_sectors_written_start = 3213 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3214 3215 /* Cleanup superblock name */ 3216 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 3217 *cp = '!'; 3218 3219 /* -EINVAL is default */ 3220 ret = -EINVAL; 3221 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3222 if (!blocksize) { 3223 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3224 goto out_fail; 3225 } 3226 3227 /* 3228 * The ext4 superblock will not be buffer aligned for other than 1kB 3229 * block sizes. We need to calculate the offset from buffer start. 3230 */ 3231 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 3232 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3233 offset = do_div(logical_sb_block, blocksize); 3234 } else { 3235 logical_sb_block = sb_block; 3236 } 3237 3238 if (!(bh = sb_bread(sb, logical_sb_block))) { 3239 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3240 goto out_fail; 3241 } 3242 /* 3243 * Note: s_es must be initialized as soon as possible because 3244 * some ext4 macro-instructions depend on its value 3245 */ 3246 es = (struct ext4_super_block *) (bh->b_data + offset); 3247 sbi->s_es = es; 3248 sb->s_magic = le16_to_cpu(es->s_magic); 3249 if (sb->s_magic != EXT4_SUPER_MAGIC) 3250 goto cantfind_ext4; 3251 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3252 3253 /* Warn if metadata_csum and gdt_csum are both set. */ 3254 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3255 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 3256 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) 3257 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are " 3258 "redundant flags; please run fsck."); 3259 3260 /* Check for a known checksum algorithm */ 3261 if (!ext4_verify_csum_type(sb, es)) { 3262 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3263 "unknown checksum algorithm."); 3264 silent = 1; 3265 goto cantfind_ext4; 3266 } 3267 3268 /* Load the checksum driver */ 3269 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3270 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 3271 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 3272 if (IS_ERR(sbi->s_chksum_driver)) { 3273 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); 3274 ret = PTR_ERR(sbi->s_chksum_driver); 3275 sbi->s_chksum_driver = NULL; 3276 goto failed_mount; 3277 } 3278 } 3279 3280 /* Check superblock checksum */ 3281 if (!ext4_superblock_csum_verify(sb, es)) { 3282 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3283 "invalid superblock checksum. Run e2fsck?"); 3284 silent = 1; 3285 goto cantfind_ext4; 3286 } 3287 3288 /* Precompute checksum seed for all metadata */ 3289 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3290 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 3291 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, 3292 sizeof(es->s_uuid)); 3293 3294 /* Set defaults before we parse the mount options */ 3295 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3296 set_opt(sb, INIT_INODE_TABLE); 3297 if (def_mount_opts & EXT4_DEFM_DEBUG) 3298 set_opt(sb, DEBUG); 3299 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 3300 set_opt(sb, GRPID); 3301 if (def_mount_opts & EXT4_DEFM_UID16) 3302 set_opt(sb, NO_UID32); 3303 /* xattr user namespace & acls are now defaulted on */ 3304 set_opt(sb, XATTR_USER); 3305 #ifdef CONFIG_EXT4_FS_POSIX_ACL 3306 set_opt(sb, POSIX_ACL); 3307 #endif 3308 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3309 set_opt(sb, JOURNAL_DATA); 3310 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3311 set_opt(sb, ORDERED_DATA); 3312 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3313 set_opt(sb, WRITEBACK_DATA); 3314 3315 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3316 set_opt(sb, ERRORS_PANIC); 3317 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3318 set_opt(sb, ERRORS_CONT); 3319 else 3320 set_opt(sb, ERRORS_RO); 3321 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) 3322 set_opt(sb, BLOCK_VALIDITY); 3323 if (def_mount_opts & EXT4_DEFM_DISCARD) 3324 set_opt(sb, DISCARD); 3325 3326 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 3327 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 3328 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 3329 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 3330 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3331 3332 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3333 set_opt(sb, BARRIER); 3334 3335 /* 3336 * enable delayed allocation by default 3337 * Use -o nodelalloc to turn it off 3338 */ 3339 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && 3340 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3341 set_opt(sb, DELALLOC); 3342 3343 /* 3344 * set default s_li_wait_mult for lazyinit, for the case there is 3345 * no mount option specified. 3346 */ 3347 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 3348 3349 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 3350 &journal_devnum, &journal_ioprio, 0)) { 3351 ext4_msg(sb, KERN_WARNING, 3352 "failed to parse options in superblock: %s", 3353 sbi->s_es->s_mount_opts); 3354 } 3355 sbi->s_def_mount_opt = sbi->s_mount_opt; 3356 if (!parse_options((char *) data, sb, &journal_devnum, 3357 &journal_ioprio, 0)) 3358 goto failed_mount; 3359 3360 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3361 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " 3362 "with data=journal disables delayed " 3363 "allocation and O_DIRECT support!\n"); 3364 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 3365 ext4_msg(sb, KERN_ERR, "can't mount with " 3366 "both data=journal and delalloc"); 3367 goto failed_mount; 3368 } 3369 if (test_opt(sb, DIOREAD_NOLOCK)) { 3370 ext4_msg(sb, KERN_ERR, "can't mount with " 3371 "both data=journal and delalloc"); 3372 goto failed_mount; 3373 } 3374 if (test_opt(sb, DELALLOC)) 3375 clear_opt(sb, DELALLOC); 3376 } 3377 3378 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3379 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3380 3381 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3382 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 3383 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 3384 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 3385 ext4_msg(sb, KERN_WARNING, 3386 "feature flags set on rev 0 fs, " 3387 "running e2fsck is recommended"); 3388 3389 if (IS_EXT2_SB(sb)) { 3390 if (ext2_feature_set_ok(sb)) 3391 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 3392 "using the ext4 subsystem"); 3393 else { 3394 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 3395 "to feature incompatibilities"); 3396 goto failed_mount; 3397 } 3398 } 3399 3400 if (IS_EXT3_SB(sb)) { 3401 if (ext3_feature_set_ok(sb)) 3402 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 3403 "using the ext4 subsystem"); 3404 else { 3405 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 3406 "to feature incompatibilities"); 3407 goto failed_mount; 3408 } 3409 } 3410 3411 /* 3412 * Check feature flags regardless of the revision level, since we 3413 * previously didn't change the revision level when setting the flags, 3414 * so there is a chance incompat flags are set on a rev 0 filesystem. 3415 */ 3416 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3417 goto failed_mount; 3418 3419 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 3420 if (blocksize < EXT4_MIN_BLOCK_SIZE || 3421 blocksize > EXT4_MAX_BLOCK_SIZE) { 3422 ext4_msg(sb, KERN_ERR, 3423 "Unsupported filesystem blocksize %d", blocksize); 3424 goto failed_mount; 3425 } 3426 3427 if (sb->s_blocksize != blocksize) { 3428 /* Validate the filesystem blocksize */ 3429 if (!sb_set_blocksize(sb, blocksize)) { 3430 ext4_msg(sb, KERN_ERR, "bad block size %d", 3431 blocksize); 3432 goto failed_mount; 3433 } 3434 3435 brelse(bh); 3436 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3437 offset = do_div(logical_sb_block, blocksize); 3438 bh = sb_bread(sb, logical_sb_block); 3439 if (!bh) { 3440 ext4_msg(sb, KERN_ERR, 3441 "Can't read superblock on 2nd try"); 3442 goto failed_mount; 3443 } 3444 es = (struct ext4_super_block *)(bh->b_data + offset); 3445 sbi->s_es = es; 3446 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3447 ext4_msg(sb, KERN_ERR, 3448 "Magic mismatch, very weird!"); 3449 goto failed_mount; 3450 } 3451 } 3452 3453 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3454 EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 3455 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3456 has_huge_files); 3457 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3458 3459 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3460 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3461 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3462 } else { 3463 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3464 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3465 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 3466 (!is_power_of_2(sbi->s_inode_size)) || 3467 (sbi->s_inode_size > blocksize)) { 3468 ext4_msg(sb, KERN_ERR, 3469 "unsupported inode size: %d", 3470 sbi->s_inode_size); 3471 goto failed_mount; 3472 } 3473 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3474 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3475 } 3476 3477 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 3478 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 3479 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 3480 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3481 !is_power_of_2(sbi->s_desc_size)) { 3482 ext4_msg(sb, KERN_ERR, 3483 "unsupported descriptor size %lu", 3484 sbi->s_desc_size); 3485 goto failed_mount; 3486 } 3487 } else 3488 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 3489 3490 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3491 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3492 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 3493 goto cantfind_ext4; 3494 3495 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3496 if (sbi->s_inodes_per_block == 0) 3497 goto cantfind_ext4; 3498 sbi->s_itb_per_group = sbi->s_inodes_per_group / 3499 sbi->s_inodes_per_block; 3500 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3501 sbi->s_sbh = bh; 3502 sbi->s_mount_state = le16_to_cpu(es->s_state); 3503 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3504 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 3505 3506 for (i = 0; i < 4; i++) 3507 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3508 sbi->s_def_hash_version = es->s_def_hash_version; 3509 i = le32_to_cpu(es->s_flags); 3510 if (i & EXT2_FLAGS_UNSIGNED_HASH) 3511 sbi->s_hash_unsigned = 3; 3512 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3513 #ifdef __CHAR_UNSIGNED__ 3514 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3515 sbi->s_hash_unsigned = 3; 3516 #else 3517 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3518 #endif 3519 } 3520 3521 /* Handle clustersize */ 3522 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 3523 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3524 EXT4_FEATURE_RO_COMPAT_BIGALLOC); 3525 if (has_bigalloc) { 3526 if (clustersize < blocksize) { 3527 ext4_msg(sb, KERN_ERR, 3528 "cluster size (%d) smaller than " 3529 "block size (%d)", clustersize, blocksize); 3530 goto failed_mount; 3531 } 3532 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 3533 le32_to_cpu(es->s_log_block_size); 3534 sbi->s_clusters_per_group = 3535 le32_to_cpu(es->s_clusters_per_group); 3536 if (sbi->s_clusters_per_group > blocksize * 8) { 3537 ext4_msg(sb, KERN_ERR, 3538 "#clusters per group too big: %lu", 3539 sbi->s_clusters_per_group); 3540 goto failed_mount; 3541 } 3542 if (sbi->s_blocks_per_group != 3543 (sbi->s_clusters_per_group * (clustersize / blocksize))) { 3544 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " 3545 "clusters per group (%lu) inconsistent", 3546 sbi->s_blocks_per_group, 3547 sbi->s_clusters_per_group); 3548 goto failed_mount; 3549 } 3550 } else { 3551 if (clustersize != blocksize) { 3552 ext4_warning(sb, "fragment/cluster size (%d) != " 3553 "block size (%d)", clustersize, 3554 blocksize); 3555 clustersize = blocksize; 3556 } 3557 if (sbi->s_blocks_per_group > blocksize * 8) { 3558 ext4_msg(sb, KERN_ERR, 3559 "#blocks per group too big: %lu", 3560 sbi->s_blocks_per_group); 3561 goto failed_mount; 3562 } 3563 sbi->s_clusters_per_group = sbi->s_blocks_per_group; 3564 sbi->s_cluster_bits = 0; 3565 } 3566 sbi->s_cluster_ratio = clustersize / blocksize; 3567 3568 if (sbi->s_inodes_per_group > blocksize * 8) { 3569 ext4_msg(sb, KERN_ERR, 3570 "#inodes per group too big: %lu", 3571 sbi->s_inodes_per_group); 3572 goto failed_mount; 3573 } 3574 3575 /* 3576 * Test whether we have more sectors than will fit in sector_t, 3577 * and whether the max offset is addressable by the page cache. 3578 */ 3579 err = generic_check_addressable(sb->s_blocksize_bits, 3580 ext4_blocks_count(es)); 3581 if (err) { 3582 ext4_msg(sb, KERN_ERR, "filesystem" 3583 " too large to mount safely on this system"); 3584 if (sizeof(sector_t) < 8) 3585 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 3586 goto failed_mount; 3587 } 3588 3589 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3590 goto cantfind_ext4; 3591 3592 /* check blocks count against device size */ 3593 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 3594 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3595 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3596 "exceeds size of device (%llu blocks)", 3597 ext4_blocks_count(es), blocks_count); 3598 goto failed_mount; 3599 } 3600 3601 /* 3602 * It makes no sense for the first data block to be beyond the end 3603 * of the filesystem. 3604 */ 3605 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3606 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 3607 "block %u is beyond end of filesystem (%llu)", 3608 le32_to_cpu(es->s_first_data_block), 3609 ext4_blocks_count(es)); 3610 goto failed_mount; 3611 } 3612 blocks_count = (ext4_blocks_count(es) - 3613 le32_to_cpu(es->s_first_data_block) + 3614 EXT4_BLOCKS_PER_GROUP(sb) - 1); 3615 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 3616 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3617 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 3618 "(block count %llu, first data block %u, " 3619 "blocks per group %lu)", sbi->s_groups_count, 3620 ext4_blocks_count(es), 3621 le32_to_cpu(es->s_first_data_block), 3622 EXT4_BLOCKS_PER_GROUP(sb)); 3623 goto failed_mount; 3624 } 3625 sbi->s_groups_count = blocks_count; 3626 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3627 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3628 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3629 EXT4_DESC_PER_BLOCK(sb); 3630 sbi->s_group_desc = ext4_kvmalloc(db_count * 3631 sizeof(struct buffer_head *), 3632 GFP_KERNEL); 3633 if (sbi->s_group_desc == NULL) { 3634 ext4_msg(sb, KERN_ERR, "not enough memory"); 3635 ret = -ENOMEM; 3636 goto failed_mount; 3637 } 3638 3639 if (ext4_proc_root) 3640 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 3641 3642 if (sbi->s_proc) 3643 proc_create_data("options", S_IRUGO, sbi->s_proc, 3644 &ext4_seq_options_fops, sb); 3645 3646 bgl_lock_init(sbi->s_blockgroup_lock); 3647 3648 for (i = 0; i < db_count; i++) { 3649 block = descriptor_loc(sb, logical_sb_block, i); 3650 sbi->s_group_desc[i] = sb_bread(sb, block); 3651 if (!sbi->s_group_desc[i]) { 3652 ext4_msg(sb, KERN_ERR, 3653 "can't read group descriptor %d", i); 3654 db_count = i; 3655 goto failed_mount2; 3656 } 3657 } 3658 if (!ext4_check_descriptors(sb, &first_not_zeroed)) { 3659 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3660 goto failed_mount2; 3661 } 3662 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 3663 if (!ext4_fill_flex_info(sb)) { 3664 ext4_msg(sb, KERN_ERR, 3665 "unable to initialize " 3666 "flex_bg meta info!"); 3667 goto failed_mount2; 3668 } 3669 3670 sbi->s_gdb_count = db_count; 3671 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3672 spin_lock_init(&sbi->s_next_gen_lock); 3673 3674 init_timer(&sbi->s_err_report); 3675 sbi->s_err_report.function = print_daily_error_info; 3676 sbi->s_err_report.data = (unsigned long) sb; 3677 3678 err = percpu_counter_init(&sbi->s_freeclusters_counter, 3679 ext4_count_free_clusters(sb)); 3680 if (!err) { 3681 err = percpu_counter_init(&sbi->s_freeinodes_counter, 3682 ext4_count_free_inodes(sb)); 3683 } 3684 if (!err) { 3685 err = percpu_counter_init(&sbi->s_dirs_counter, 3686 ext4_count_dirs(sb)); 3687 } 3688 if (!err) { 3689 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0); 3690 } 3691 if (err) { 3692 ext4_msg(sb, KERN_ERR, "insufficient memory"); 3693 goto failed_mount3; 3694 } 3695 3696 sbi->s_stripe = ext4_get_stripe_size(sbi); 3697 sbi->s_max_writeback_mb_bump = 128; 3698 sbi->s_extent_max_zeroout_kb = 32; 3699 3700 /* Register extent status tree shrinker */ 3701 ext4_es_register_shrinker(sb); 3702 3703 /* 3704 * set up enough so that it can read an inode 3705 */ 3706 if (!test_opt(sb, NOLOAD) && 3707 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 3708 sb->s_op = &ext4_sops; 3709 else 3710 sb->s_op = &ext4_nojournal_sops; 3711 sb->s_export_op = &ext4_export_ops; 3712 sb->s_xattr = ext4_xattr_handlers; 3713 #ifdef CONFIG_QUOTA 3714 sb->s_qcop = &ext4_qctl_operations; 3715 sb->dq_op = &ext4_quota_operations; 3716 3717 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) { 3718 /* Use qctl operations for hidden quota files. */ 3719 sb->s_qcop = &ext4_qctl_sysfile_operations; 3720 } 3721 #endif 3722 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3723 3724 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 3725 mutex_init(&sbi->s_orphan_lock); 3726 3727 sb->s_root = NULL; 3728 3729 needs_recovery = (es->s_last_orphan != 0 || 3730 EXT4_HAS_INCOMPAT_FEATURE(sb, 3731 EXT4_FEATURE_INCOMPAT_RECOVER)); 3732 3733 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) && 3734 !(sb->s_flags & MS_RDONLY)) 3735 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 3736 goto failed_mount3; 3737 3738 /* 3739 * The first inode we look at is the journal inode. Don't try 3740 * root first: it may be modified in the journal! 3741 */ 3742 if (!test_opt(sb, NOLOAD) && 3743 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3744 if (ext4_load_journal(sb, es, journal_devnum)) 3745 goto failed_mount3; 3746 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 3747 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3748 ext4_msg(sb, KERN_ERR, "required journal recovery " 3749 "suppressed and not mounted read-only"); 3750 goto failed_mount_wq; 3751 } else { 3752 clear_opt(sb, DATA_FLAGS); 3753 sbi->s_journal = NULL; 3754 needs_recovery = 0; 3755 goto no_journal; 3756 } 3757 3758 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) && 3759 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 3760 JBD2_FEATURE_INCOMPAT_64BIT)) { 3761 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 3762 goto failed_mount_wq; 3763 } 3764 3765 if (!set_journal_csum_feature_set(sb)) { 3766 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " 3767 "feature set"); 3768 goto failed_mount_wq; 3769 } 3770 3771 /* We have now updated the journal if required, so we can 3772 * validate the data journaling mode. */ 3773 switch (test_opt(sb, DATA_FLAGS)) { 3774 case 0: 3775 /* No mode set, assume a default based on the journal 3776 * capabilities: ORDERED_DATA if the journal can 3777 * cope, else JOURNAL_DATA 3778 */ 3779 if (jbd2_journal_check_available_features 3780 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3781 set_opt(sb, ORDERED_DATA); 3782 else 3783 set_opt(sb, JOURNAL_DATA); 3784 break; 3785 3786 case EXT4_MOUNT_ORDERED_DATA: 3787 case EXT4_MOUNT_WRITEBACK_DATA: 3788 if (!jbd2_journal_check_available_features 3789 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3790 ext4_msg(sb, KERN_ERR, "Journal does not support " 3791 "requested data journaling mode"); 3792 goto failed_mount_wq; 3793 } 3794 default: 3795 break; 3796 } 3797 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3798 3799 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; 3800 3801 /* 3802 * The journal may have updated the bg summary counts, so we 3803 * need to update the global counters. 3804 */ 3805 percpu_counter_set(&sbi->s_freeclusters_counter, 3806 ext4_count_free_clusters(sb)); 3807 percpu_counter_set(&sbi->s_freeinodes_counter, 3808 ext4_count_free_inodes(sb)); 3809 percpu_counter_set(&sbi->s_dirs_counter, 3810 ext4_count_dirs(sb)); 3811 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0); 3812 3813 no_journal: 3814 /* 3815 * Get the # of file system overhead blocks from the 3816 * superblock if present. 3817 */ 3818 if (es->s_overhead_clusters) 3819 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); 3820 else { 3821 err = ext4_calculate_overhead(sb); 3822 if (err) 3823 goto failed_mount_wq; 3824 } 3825 3826 /* 3827 * The maximum number of concurrent works can be high and 3828 * concurrency isn't really necessary. Limit it to 1. 3829 */ 3830 EXT4_SB(sb)->dio_unwritten_wq = 3831 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 3832 if (!EXT4_SB(sb)->dio_unwritten_wq) { 3833 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); 3834 ret = -ENOMEM; 3835 goto failed_mount_wq; 3836 } 3837 3838 /* 3839 * The jbd2_journal_load will have done any necessary log recovery, 3840 * so we can safely mount the rest of the filesystem now. 3841 */ 3842 3843 root = ext4_iget(sb, EXT4_ROOT_INO); 3844 if (IS_ERR(root)) { 3845 ext4_msg(sb, KERN_ERR, "get root inode failed"); 3846 ret = PTR_ERR(root); 3847 root = NULL; 3848 goto failed_mount4; 3849 } 3850 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3851 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 3852 iput(root); 3853 goto failed_mount4; 3854 } 3855 sb->s_root = d_make_root(root); 3856 if (!sb->s_root) { 3857 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 3858 ret = -ENOMEM; 3859 goto failed_mount4; 3860 } 3861 3862 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) 3863 sb->s_flags |= MS_RDONLY; 3864 3865 /* determine the minimum size of new large inodes, if present */ 3866 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3867 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3868 EXT4_GOOD_OLD_INODE_SIZE; 3869 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3870 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 3871 if (sbi->s_want_extra_isize < 3872 le16_to_cpu(es->s_want_extra_isize)) 3873 sbi->s_want_extra_isize = 3874 le16_to_cpu(es->s_want_extra_isize); 3875 if (sbi->s_want_extra_isize < 3876 le16_to_cpu(es->s_min_extra_isize)) 3877 sbi->s_want_extra_isize = 3878 le16_to_cpu(es->s_min_extra_isize); 3879 } 3880 } 3881 /* Check if enough inode space is available */ 3882 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3883 sbi->s_inode_size) { 3884 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3885 EXT4_GOOD_OLD_INODE_SIZE; 3886 ext4_msg(sb, KERN_INFO, "required extra inode space not" 3887 "available"); 3888 } 3889 3890 err = ext4_setup_system_zone(sb); 3891 if (err) { 3892 ext4_msg(sb, KERN_ERR, "failed to initialize system " 3893 "zone (%d)", err); 3894 goto failed_mount4a; 3895 } 3896 3897 ext4_ext_init(sb); 3898 err = ext4_mb_init(sb); 3899 if (err) { 3900 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3901 err); 3902 goto failed_mount5; 3903 } 3904 3905 err = ext4_register_li_request(sb, first_not_zeroed); 3906 if (err) 3907 goto failed_mount6; 3908 3909 sbi->s_kobj.kset = ext4_kset; 3910 init_completion(&sbi->s_kobj_unregister); 3911 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 3912 "%s", sb->s_id); 3913 if (err) 3914 goto failed_mount7; 3915 3916 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3917 ext4_orphan_cleanup(sb, es); 3918 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 3919 if (needs_recovery) { 3920 ext4_msg(sb, KERN_INFO, "recovery complete"); 3921 ext4_mark_recovery_complete(sb, es); 3922 } 3923 if (EXT4_SB(sb)->s_journal) { 3924 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3925 descr = " journalled data mode"; 3926 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3927 descr = " ordered data mode"; 3928 else 3929 descr = " writeback data mode"; 3930 } else 3931 descr = "out journal"; 3932 3933 #ifdef CONFIG_QUOTA 3934 /* Enable quota usage during mount. */ 3935 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && 3936 !(sb->s_flags & MS_RDONLY)) { 3937 err = ext4_enable_quotas(sb); 3938 if (err) 3939 goto failed_mount8; 3940 } 3941 #endif /* CONFIG_QUOTA */ 3942 3943 if (test_opt(sb, DISCARD)) { 3944 struct request_queue *q = bdev_get_queue(sb->s_bdev); 3945 if (!blk_queue_discard(q)) 3946 ext4_msg(sb, KERN_WARNING, 3947 "mounting with \"discard\" option, but " 3948 "the device does not support discard"); 3949 } 3950 3951 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 3952 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 3953 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 3954 3955 if (es->s_error_count) 3956 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 3957 3958 kfree(orig_data); 3959 return 0; 3960 3961 cantfind_ext4: 3962 if (!silent) 3963 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 3964 goto failed_mount; 3965 3966 #ifdef CONFIG_QUOTA 3967 failed_mount8: 3968 kobject_del(&sbi->s_kobj); 3969 #endif 3970 failed_mount7: 3971 ext4_unregister_li_request(sb); 3972 failed_mount6: 3973 ext4_mb_release(sb); 3974 failed_mount5: 3975 ext4_ext_release(sb); 3976 ext4_release_system_zone(sb); 3977 failed_mount4a: 3978 dput(sb->s_root); 3979 sb->s_root = NULL; 3980 failed_mount4: 3981 ext4_msg(sb, KERN_ERR, "mount failed"); 3982 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); 3983 failed_mount_wq: 3984 if (sbi->s_journal) { 3985 jbd2_journal_destroy(sbi->s_journal); 3986 sbi->s_journal = NULL; 3987 } 3988 failed_mount3: 3989 del_timer(&sbi->s_err_report); 3990 if (sbi->s_flex_groups) 3991 ext4_kvfree(sbi->s_flex_groups); 3992 percpu_counter_destroy(&sbi->s_freeclusters_counter); 3993 percpu_counter_destroy(&sbi->s_freeinodes_counter); 3994 percpu_counter_destroy(&sbi->s_dirs_counter); 3995 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 3996 if (sbi->s_mmp_tsk) 3997 kthread_stop(sbi->s_mmp_tsk); 3998 failed_mount2: 3999 for (i = 0; i < db_count; i++) 4000 brelse(sbi->s_group_desc[i]); 4001 ext4_kvfree(sbi->s_group_desc); 4002 failed_mount: 4003 if (sbi->s_chksum_driver) 4004 crypto_free_shash(sbi->s_chksum_driver); 4005 if (sbi->s_proc) { 4006 remove_proc_entry("options", sbi->s_proc); 4007 remove_proc_entry(sb->s_id, ext4_proc_root); 4008 } 4009 #ifdef CONFIG_QUOTA 4010 for (i = 0; i < MAXQUOTAS; i++) 4011 kfree(sbi->s_qf_names[i]); 4012 #endif 4013 ext4_blkdev_remove(sbi); 4014 brelse(bh); 4015 out_fail: 4016 sb->s_fs_info = NULL; 4017 kfree(sbi->s_blockgroup_lock); 4018 kfree(sbi); 4019 out_free_orig: 4020 kfree(orig_data); 4021 return err ? err : ret; 4022 } 4023 4024 /* 4025 * Setup any per-fs journal parameters now. We'll do this both on 4026 * initial mount, once the journal has been initialised but before we've 4027 * done any recovery; and again on any subsequent remount. 4028 */ 4029 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 4030 { 4031 struct ext4_sb_info *sbi = EXT4_SB(sb); 4032 4033 journal->j_commit_interval = sbi->s_commit_interval; 4034 journal->j_min_batch_time = sbi->s_min_batch_time; 4035 journal->j_max_batch_time = sbi->s_max_batch_time; 4036 4037 write_lock(&journal->j_state_lock); 4038 if (test_opt(sb, BARRIER)) 4039 journal->j_flags |= JBD2_BARRIER; 4040 else 4041 journal->j_flags &= ~JBD2_BARRIER; 4042 if (test_opt(sb, DATA_ERR_ABORT)) 4043 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 4044 else 4045 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 4046 write_unlock(&journal->j_state_lock); 4047 } 4048 4049 static journal_t *ext4_get_journal(struct super_block *sb, 4050 unsigned int journal_inum) 4051 { 4052 struct inode *journal_inode; 4053 journal_t *journal; 4054 4055 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4056 4057 /* First, test for the existence of a valid inode on disk. Bad 4058 * things happen if we iget() an unused inode, as the subsequent 4059 * iput() will try to delete it. */ 4060 4061 journal_inode = ext4_iget(sb, journal_inum); 4062 if (IS_ERR(journal_inode)) { 4063 ext4_msg(sb, KERN_ERR, "no journal found"); 4064 return NULL; 4065 } 4066 if (!journal_inode->i_nlink) { 4067 make_bad_inode(journal_inode); 4068 iput(journal_inode); 4069 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 4070 return NULL; 4071 } 4072 4073 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 4074 journal_inode, journal_inode->i_size); 4075 if (!S_ISREG(journal_inode->i_mode)) { 4076 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 4077 iput(journal_inode); 4078 return NULL; 4079 } 4080 4081 journal = jbd2_journal_init_inode(journal_inode); 4082 if (!journal) { 4083 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 4084 iput(journal_inode); 4085 return NULL; 4086 } 4087 journal->j_private = sb; 4088 ext4_init_journal_params(sb, journal); 4089 return journal; 4090 } 4091 4092 static journal_t *ext4_get_dev_journal(struct super_block *sb, 4093 dev_t j_dev) 4094 { 4095 struct buffer_head *bh; 4096 journal_t *journal; 4097 ext4_fsblk_t start; 4098 ext4_fsblk_t len; 4099 int hblock, blocksize; 4100 ext4_fsblk_t sb_block; 4101 unsigned long offset; 4102 struct ext4_super_block *es; 4103 struct block_device *bdev; 4104 4105 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4106 4107 bdev = ext4_blkdev_get(j_dev, sb); 4108 if (bdev == NULL) 4109 return NULL; 4110 4111 blocksize = sb->s_blocksize; 4112 hblock = bdev_logical_block_size(bdev); 4113 if (blocksize < hblock) { 4114 ext4_msg(sb, KERN_ERR, 4115 "blocksize too small for journal device"); 4116 goto out_bdev; 4117 } 4118 4119 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 4120 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 4121 set_blocksize(bdev, blocksize); 4122 if (!(bh = __bread(bdev, sb_block, blocksize))) { 4123 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 4124 "external journal"); 4125 goto out_bdev; 4126 } 4127 4128 es = (struct ext4_super_block *) (bh->b_data + offset); 4129 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 4130 !(le32_to_cpu(es->s_feature_incompat) & 4131 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 4132 ext4_msg(sb, KERN_ERR, "external journal has " 4133 "bad superblock"); 4134 brelse(bh); 4135 goto out_bdev; 4136 } 4137 4138 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 4139 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 4140 brelse(bh); 4141 goto out_bdev; 4142 } 4143 4144 len = ext4_blocks_count(es); 4145 start = sb_block + 1; 4146 brelse(bh); /* we're done with the superblock */ 4147 4148 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 4149 start, len, blocksize); 4150 if (!journal) { 4151 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 4152 goto out_bdev; 4153 } 4154 journal->j_private = sb; 4155 ll_rw_block(READ, 1, &journal->j_sb_buffer); 4156 wait_on_buffer(journal->j_sb_buffer); 4157 if (!buffer_uptodate(journal->j_sb_buffer)) { 4158 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 4159 goto out_journal; 4160 } 4161 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 4162 ext4_msg(sb, KERN_ERR, "External journal has more than one " 4163 "user (unsupported) - %d", 4164 be32_to_cpu(journal->j_superblock->s_nr_users)); 4165 goto out_journal; 4166 } 4167 EXT4_SB(sb)->journal_bdev = bdev; 4168 ext4_init_journal_params(sb, journal); 4169 return journal; 4170 4171 out_journal: 4172 jbd2_journal_destroy(journal); 4173 out_bdev: 4174 ext4_blkdev_put(bdev); 4175 return NULL; 4176 } 4177 4178 static int ext4_load_journal(struct super_block *sb, 4179 struct ext4_super_block *es, 4180 unsigned long journal_devnum) 4181 { 4182 journal_t *journal; 4183 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 4184 dev_t journal_dev; 4185 int err = 0; 4186 int really_read_only; 4187 4188 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4189 4190 if (journal_devnum && 4191 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4192 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 4193 "numbers have changed"); 4194 journal_dev = new_decode_dev(journal_devnum); 4195 } else 4196 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 4197 4198 really_read_only = bdev_read_only(sb->s_bdev); 4199 4200 /* 4201 * Are we loading a blank journal or performing recovery after a 4202 * crash? For recovery, we need to check in advance whether we 4203 * can get read-write access to the device. 4204 */ 4205 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 4206 if (sb->s_flags & MS_RDONLY) { 4207 ext4_msg(sb, KERN_INFO, "INFO: recovery " 4208 "required on readonly filesystem"); 4209 if (really_read_only) { 4210 ext4_msg(sb, KERN_ERR, "write access " 4211 "unavailable, cannot proceed"); 4212 return -EROFS; 4213 } 4214 ext4_msg(sb, KERN_INFO, "write access will " 4215 "be enabled during recovery"); 4216 } 4217 } 4218 4219 if (journal_inum && journal_dev) { 4220 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4221 "and inode journals!"); 4222 return -EINVAL; 4223 } 4224 4225 if (journal_inum) { 4226 if (!(journal = ext4_get_journal(sb, journal_inum))) 4227 return -EINVAL; 4228 } else { 4229 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4230 return -EINVAL; 4231 } 4232 4233 if (!(journal->j_flags & JBD2_BARRIER)) 4234 ext4_msg(sb, KERN_INFO, "barriers disabled"); 4235 4236 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 4237 err = jbd2_journal_wipe(journal, !really_read_only); 4238 if (!err) { 4239 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 4240 if (save) 4241 memcpy(save, ((char *) es) + 4242 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4243 err = jbd2_journal_load(journal); 4244 if (save) 4245 memcpy(((char *) es) + EXT4_S_ERR_START, 4246 save, EXT4_S_ERR_LEN); 4247 kfree(save); 4248 } 4249 4250 if (err) { 4251 ext4_msg(sb, KERN_ERR, "error loading journal"); 4252 jbd2_journal_destroy(journal); 4253 return err; 4254 } 4255 4256 EXT4_SB(sb)->s_journal = journal; 4257 ext4_clear_journal_err(sb, es); 4258 4259 if (!really_read_only && journal_devnum && 4260 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4261 es->s_journal_dev = cpu_to_le32(journal_devnum); 4262 4263 /* Make sure we flush the recovery flag to disk. */ 4264 ext4_commit_super(sb, 1); 4265 } 4266 4267 return 0; 4268 } 4269 4270 static int ext4_commit_super(struct super_block *sb, int sync) 4271 { 4272 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4273 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4274 int error = 0; 4275 4276 if (!sbh || block_device_ejected(sb)) 4277 return error; 4278 if (buffer_write_io_error(sbh)) { 4279 /* 4280 * Oh, dear. A previous attempt to write the 4281 * superblock failed. This could happen because the 4282 * USB device was yanked out. Or it could happen to 4283 * be a transient write error and maybe the block will 4284 * be remapped. Nothing we can do but to retry the 4285 * write and hope for the best. 4286 */ 4287 ext4_msg(sb, KERN_ERR, "previous I/O error to " 4288 "superblock detected"); 4289 clear_buffer_write_io_error(sbh); 4290 set_buffer_uptodate(sbh); 4291 } 4292 /* 4293 * If the file system is mounted read-only, don't update the 4294 * superblock write time. This avoids updating the superblock 4295 * write time when we are mounting the root file system 4296 * read/only but we need to replay the journal; at that point, 4297 * for people who are east of GMT and who make their clock 4298 * tick in localtime for Windows bug-for-bug compatibility, 4299 * the clock is set in the future, and this will cause e2fsck 4300 * to complain and force a full file system check. 4301 */ 4302 if (!(sb->s_flags & MS_RDONLY)) 4303 es->s_wtime = cpu_to_le32(get_seconds()); 4304 if (sb->s_bdev->bd_part) 4305 es->s_kbytes_written = 4306 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4307 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4308 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4309 else 4310 es->s_kbytes_written = 4311 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 4312 ext4_free_blocks_count_set(es, 4313 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( 4314 &EXT4_SB(sb)->s_freeclusters_counter))); 4315 es->s_free_inodes_count = 4316 cpu_to_le32(percpu_counter_sum_positive( 4317 &EXT4_SB(sb)->s_freeinodes_counter)); 4318 BUFFER_TRACE(sbh, "marking dirty"); 4319 ext4_superblock_csum_set(sb); 4320 mark_buffer_dirty(sbh); 4321 if (sync) { 4322 error = sync_dirty_buffer(sbh); 4323 if (error) 4324 return error; 4325 4326 error = buffer_write_io_error(sbh); 4327 if (error) { 4328 ext4_msg(sb, KERN_ERR, "I/O error while writing " 4329 "superblock"); 4330 clear_buffer_write_io_error(sbh); 4331 set_buffer_uptodate(sbh); 4332 } 4333 } 4334 return error; 4335 } 4336 4337 /* 4338 * Have we just finished recovery? If so, and if we are mounting (or 4339 * remounting) the filesystem readonly, then we will end up with a 4340 * consistent fs on disk. Record that fact. 4341 */ 4342 static void ext4_mark_recovery_complete(struct super_block *sb, 4343 struct ext4_super_block *es) 4344 { 4345 journal_t *journal = EXT4_SB(sb)->s_journal; 4346 4347 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 4348 BUG_ON(journal != NULL); 4349 return; 4350 } 4351 jbd2_journal_lock_updates(journal); 4352 if (jbd2_journal_flush(journal) < 0) 4353 goto out; 4354 4355 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 4356 sb->s_flags & MS_RDONLY) { 4357 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4358 ext4_commit_super(sb, 1); 4359 } 4360 4361 out: 4362 jbd2_journal_unlock_updates(journal); 4363 } 4364 4365 /* 4366 * If we are mounting (or read-write remounting) a filesystem whose journal 4367 * has recorded an error from a previous lifetime, move that error to the 4368 * main filesystem now. 4369 */ 4370 static void ext4_clear_journal_err(struct super_block *sb, 4371 struct ext4_super_block *es) 4372 { 4373 journal_t *journal; 4374 int j_errno; 4375 const char *errstr; 4376 4377 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4378 4379 journal = EXT4_SB(sb)->s_journal; 4380 4381 /* 4382 * Now check for any error status which may have been recorded in the 4383 * journal by a prior ext4_error() or ext4_abort() 4384 */ 4385 4386 j_errno = jbd2_journal_errno(journal); 4387 if (j_errno) { 4388 char nbuf[16]; 4389 4390 errstr = ext4_decode_error(sb, j_errno, nbuf); 4391 ext4_warning(sb, "Filesystem error recorded " 4392 "from previous mount: %s", errstr); 4393 ext4_warning(sb, "Marking fs in need of filesystem check."); 4394 4395 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4396 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4397 ext4_commit_super(sb, 1); 4398 4399 jbd2_journal_clear_err(journal); 4400 jbd2_journal_update_sb_errno(journal); 4401 } 4402 } 4403 4404 /* 4405 * Force the running and committing transactions to commit, 4406 * and wait on the commit. 4407 */ 4408 int ext4_force_commit(struct super_block *sb) 4409 { 4410 journal_t *journal; 4411 4412 if (sb->s_flags & MS_RDONLY) 4413 return 0; 4414 4415 journal = EXT4_SB(sb)->s_journal; 4416 return ext4_journal_force_commit(journal); 4417 } 4418 4419 static int ext4_sync_fs(struct super_block *sb, int wait) 4420 { 4421 int ret = 0; 4422 tid_t target; 4423 struct ext4_sb_info *sbi = EXT4_SB(sb); 4424 4425 trace_ext4_sync_fs(sb, wait); 4426 flush_workqueue(sbi->dio_unwritten_wq); 4427 /* 4428 * Writeback quota in non-journalled quota case - journalled quota has 4429 * no dirty dquots 4430 */ 4431 dquot_writeback_dquots(sb, -1); 4432 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4433 if (wait) 4434 jbd2_log_wait_commit(sbi->s_journal, target); 4435 } 4436 return ret; 4437 } 4438 4439 /* 4440 * LVM calls this function before a (read-only) snapshot is created. This 4441 * gives us a chance to flush the journal completely and mark the fs clean. 4442 * 4443 * Note that only this function cannot bring a filesystem to be in a clean 4444 * state independently. It relies on upper layer to stop all data & metadata 4445 * modifications. 4446 */ 4447 static int ext4_freeze(struct super_block *sb) 4448 { 4449 int error = 0; 4450 journal_t *journal; 4451 4452 if (sb->s_flags & MS_RDONLY) 4453 return 0; 4454 4455 journal = EXT4_SB(sb)->s_journal; 4456 4457 /* Now we set up the journal barrier. */ 4458 jbd2_journal_lock_updates(journal); 4459 4460 /* 4461 * Don't clear the needs_recovery flag if we failed to flush 4462 * the journal. 4463 */ 4464 error = jbd2_journal_flush(journal); 4465 if (error < 0) 4466 goto out; 4467 4468 /* Journal blocked and flushed, clear needs_recovery flag. */ 4469 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4470 error = ext4_commit_super(sb, 1); 4471 out: 4472 /* we rely on upper layer to stop further updates */ 4473 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4474 return error; 4475 } 4476 4477 /* 4478 * Called by LVM after the snapshot is done. We need to reset the RECOVER 4479 * flag here, even though the filesystem is not technically dirty yet. 4480 */ 4481 static int ext4_unfreeze(struct super_block *sb) 4482 { 4483 if (sb->s_flags & MS_RDONLY) 4484 return 0; 4485 4486 /* Reset the needs_recovery flag before the fs is unlocked. */ 4487 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4488 ext4_commit_super(sb, 1); 4489 return 0; 4490 } 4491 4492 /* 4493 * Structure to save mount options for ext4_remount's benefit 4494 */ 4495 struct ext4_mount_options { 4496 unsigned long s_mount_opt; 4497 unsigned long s_mount_opt2; 4498 kuid_t s_resuid; 4499 kgid_t s_resgid; 4500 unsigned long s_commit_interval; 4501 u32 s_min_batch_time, s_max_batch_time; 4502 #ifdef CONFIG_QUOTA 4503 int s_jquota_fmt; 4504 char *s_qf_names[MAXQUOTAS]; 4505 #endif 4506 }; 4507 4508 static int ext4_remount(struct super_block *sb, int *flags, char *data) 4509 { 4510 struct ext4_super_block *es; 4511 struct ext4_sb_info *sbi = EXT4_SB(sb); 4512 unsigned long old_sb_flags; 4513 struct ext4_mount_options old_opts; 4514 int enable_quota = 0; 4515 ext4_group_t g; 4516 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4517 int err = 0; 4518 #ifdef CONFIG_QUOTA 4519 int i, j; 4520 #endif 4521 char *orig_data = kstrdup(data, GFP_KERNEL); 4522 4523 /* Store the original options */ 4524 old_sb_flags = sb->s_flags; 4525 old_opts.s_mount_opt = sbi->s_mount_opt; 4526 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4527 old_opts.s_resuid = sbi->s_resuid; 4528 old_opts.s_resgid = sbi->s_resgid; 4529 old_opts.s_commit_interval = sbi->s_commit_interval; 4530 old_opts.s_min_batch_time = sbi->s_min_batch_time; 4531 old_opts.s_max_batch_time = sbi->s_max_batch_time; 4532 #ifdef CONFIG_QUOTA 4533 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4534 for (i = 0; i < MAXQUOTAS; i++) 4535 if (sbi->s_qf_names[i]) { 4536 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], 4537 GFP_KERNEL); 4538 if (!old_opts.s_qf_names[i]) { 4539 for (j = 0; j < i; j++) 4540 kfree(old_opts.s_qf_names[j]); 4541 return -ENOMEM; 4542 } 4543 } else 4544 old_opts.s_qf_names[i] = NULL; 4545 #endif 4546 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4547 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4548 4549 /* 4550 * Allow the "check" option to be passed as a remount option. 4551 */ 4552 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { 4553 err = -EINVAL; 4554 goto restore_opts; 4555 } 4556 4557 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 4558 ext4_abort(sb, "Abort forced by user"); 4559 4560 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 4561 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 4562 4563 es = sbi->s_es; 4564 4565 if (sbi->s_journal) { 4566 ext4_init_journal_params(sb, sbi->s_journal); 4567 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4568 } 4569 4570 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { 4571 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 4572 err = -EROFS; 4573 goto restore_opts; 4574 } 4575 4576 if (*flags & MS_RDONLY) { 4577 err = dquot_suspend(sb, -1); 4578 if (err < 0) 4579 goto restore_opts; 4580 4581 /* 4582 * First of all, the unconditional stuff we have to do 4583 * to disable replay of the journal when we next remount 4584 */ 4585 sb->s_flags |= MS_RDONLY; 4586 4587 /* 4588 * OK, test if we are remounting a valid rw partition 4589 * readonly, and if so set the rdonly flag and then 4590 * mark the partition as valid again. 4591 */ 4592 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 4593 (sbi->s_mount_state & EXT4_VALID_FS)) 4594 es->s_state = cpu_to_le16(sbi->s_mount_state); 4595 4596 if (sbi->s_journal) 4597 ext4_mark_recovery_complete(sb, es); 4598 } else { 4599 /* Make sure we can mount this feature set readwrite */ 4600 if (!ext4_feature_set_ok(sb, 0)) { 4601 err = -EROFS; 4602 goto restore_opts; 4603 } 4604 /* 4605 * Make sure the group descriptor checksums 4606 * are sane. If they aren't, refuse to remount r/w. 4607 */ 4608 for (g = 0; g < sbi->s_groups_count; g++) { 4609 struct ext4_group_desc *gdp = 4610 ext4_get_group_desc(sb, g, NULL); 4611 4612 if (!ext4_group_desc_csum_verify(sb, g, gdp)) { 4613 ext4_msg(sb, KERN_ERR, 4614 "ext4_remount: Checksum for group %u failed (%u!=%u)", 4615 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 4616 le16_to_cpu(gdp->bg_checksum)); 4617 err = -EINVAL; 4618 goto restore_opts; 4619 } 4620 } 4621 4622 /* 4623 * If we have an unprocessed orphan list hanging 4624 * around from a previously readonly bdev mount, 4625 * require a full umount/remount for now. 4626 */ 4627 if (es->s_last_orphan) { 4628 ext4_msg(sb, KERN_WARNING, "Couldn't " 4629 "remount RDWR because of unprocessed " 4630 "orphan inode list. Please " 4631 "umount/remount instead"); 4632 err = -EINVAL; 4633 goto restore_opts; 4634 } 4635 4636 /* 4637 * Mounting a RDONLY partition read-write, so reread 4638 * and store the current valid flag. (It may have 4639 * been changed by e2fsck since we originally mounted 4640 * the partition.) 4641 */ 4642 if (sbi->s_journal) 4643 ext4_clear_journal_err(sb, es); 4644 sbi->s_mount_state = le16_to_cpu(es->s_state); 4645 if (!ext4_setup_super(sb, es, 0)) 4646 sb->s_flags &= ~MS_RDONLY; 4647 if (EXT4_HAS_INCOMPAT_FEATURE(sb, 4648 EXT4_FEATURE_INCOMPAT_MMP)) 4649 if (ext4_multi_mount_protect(sb, 4650 le64_to_cpu(es->s_mmp_block))) { 4651 err = -EROFS; 4652 goto restore_opts; 4653 } 4654 enable_quota = 1; 4655 } 4656 } 4657 4658 /* 4659 * Reinitialize lazy itable initialization thread based on 4660 * current settings 4661 */ 4662 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 4663 ext4_unregister_li_request(sb); 4664 else { 4665 ext4_group_t first_not_zeroed; 4666 first_not_zeroed = ext4_has_uninit_itable(sb); 4667 ext4_register_li_request(sb, first_not_zeroed); 4668 } 4669 4670 ext4_setup_system_zone(sb); 4671 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) 4672 ext4_commit_super(sb, 1); 4673 4674 #ifdef CONFIG_QUOTA 4675 /* Release old quota file names */ 4676 for (i = 0; i < MAXQUOTAS; i++) 4677 kfree(old_opts.s_qf_names[i]); 4678 if (enable_quota) { 4679 if (sb_any_quota_suspended(sb)) 4680 dquot_resume(sb, -1); 4681 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 4682 EXT4_FEATURE_RO_COMPAT_QUOTA)) { 4683 err = ext4_enable_quotas(sb); 4684 if (err) 4685 goto restore_opts; 4686 } 4687 } 4688 #endif 4689 4690 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 4691 kfree(orig_data); 4692 return 0; 4693 4694 restore_opts: 4695 sb->s_flags = old_sb_flags; 4696 sbi->s_mount_opt = old_opts.s_mount_opt; 4697 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 4698 sbi->s_resuid = old_opts.s_resuid; 4699 sbi->s_resgid = old_opts.s_resgid; 4700 sbi->s_commit_interval = old_opts.s_commit_interval; 4701 sbi->s_min_batch_time = old_opts.s_min_batch_time; 4702 sbi->s_max_batch_time = old_opts.s_max_batch_time; 4703 #ifdef CONFIG_QUOTA 4704 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 4705 for (i = 0; i < MAXQUOTAS; i++) { 4706 kfree(sbi->s_qf_names[i]); 4707 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 4708 } 4709 #endif 4710 kfree(orig_data); 4711 return err; 4712 } 4713 4714 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 4715 { 4716 struct super_block *sb = dentry->d_sb; 4717 struct ext4_sb_info *sbi = EXT4_SB(sb); 4718 struct ext4_super_block *es = sbi->s_es; 4719 ext4_fsblk_t overhead = 0; 4720 u64 fsid; 4721 s64 bfree; 4722 4723 if (!test_opt(sb, MINIX_DF)) 4724 overhead = sbi->s_overhead; 4725 4726 buf->f_type = EXT4_SUPER_MAGIC; 4727 buf->f_bsize = sb->s_blocksize; 4728 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); 4729 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 4730 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 4731 /* prevent underflow in case that few free space is available */ 4732 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 4733 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 4734 if (buf->f_bfree < ext4_r_blocks_count(es)) 4735 buf->f_bavail = 0; 4736 buf->f_files = le32_to_cpu(es->s_inodes_count); 4737 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 4738 buf->f_namelen = EXT4_NAME_LEN; 4739 fsid = le64_to_cpup((void *)es->s_uuid) ^ 4740 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 4741 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 4742 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 4743 4744 return 0; 4745 } 4746 4747 /* Helper function for writing quotas on sync - we need to start transaction 4748 * before quota file is locked for write. Otherwise the are possible deadlocks: 4749 * Process 1 Process 2 4750 * ext4_create() quota_sync() 4751 * jbd2_journal_start() write_dquot() 4752 * dquot_initialize() down(dqio_mutex) 4753 * down(dqio_mutex) jbd2_journal_start() 4754 * 4755 */ 4756 4757 #ifdef CONFIG_QUOTA 4758 4759 static inline struct inode *dquot_to_inode(struct dquot *dquot) 4760 { 4761 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 4762 } 4763 4764 static int ext4_write_dquot(struct dquot *dquot) 4765 { 4766 int ret, err; 4767 handle_t *handle; 4768 struct inode *inode; 4769 4770 inode = dquot_to_inode(dquot); 4771 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 4772 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 4773 if (IS_ERR(handle)) 4774 return PTR_ERR(handle); 4775 ret = dquot_commit(dquot); 4776 err = ext4_journal_stop(handle); 4777 if (!ret) 4778 ret = err; 4779 return ret; 4780 } 4781 4782 static int ext4_acquire_dquot(struct dquot *dquot) 4783 { 4784 int ret, err; 4785 handle_t *handle; 4786 4787 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 4788 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 4789 if (IS_ERR(handle)) 4790 return PTR_ERR(handle); 4791 ret = dquot_acquire(dquot); 4792 err = ext4_journal_stop(handle); 4793 if (!ret) 4794 ret = err; 4795 return ret; 4796 } 4797 4798 static int ext4_release_dquot(struct dquot *dquot) 4799 { 4800 int ret, err; 4801 handle_t *handle; 4802 4803 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 4804 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 4805 if (IS_ERR(handle)) { 4806 /* Release dquot anyway to avoid endless cycle in dqput() */ 4807 dquot_release(dquot); 4808 return PTR_ERR(handle); 4809 } 4810 ret = dquot_release(dquot); 4811 err = ext4_journal_stop(handle); 4812 if (!ret) 4813 ret = err; 4814 return ret; 4815 } 4816 4817 static int ext4_mark_dquot_dirty(struct dquot *dquot) 4818 { 4819 /* Are we journaling quotas? */ 4820 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 4821 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 4822 dquot_mark_dquot_dirty(dquot); 4823 return ext4_write_dquot(dquot); 4824 } else { 4825 return dquot_mark_dquot_dirty(dquot); 4826 } 4827 } 4828 4829 static int ext4_write_info(struct super_block *sb, int type) 4830 { 4831 int ret, err; 4832 handle_t *handle; 4833 4834 /* Data block + inode block */ 4835 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2); 4836 if (IS_ERR(handle)) 4837 return PTR_ERR(handle); 4838 ret = dquot_commit_info(sb, type); 4839 err = ext4_journal_stop(handle); 4840 if (!ret) 4841 ret = err; 4842 return ret; 4843 } 4844 4845 /* 4846 * Turn on quotas during mount time - we need to find 4847 * the quota file and such... 4848 */ 4849 static int ext4_quota_on_mount(struct super_block *sb, int type) 4850 { 4851 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 4852 EXT4_SB(sb)->s_jquota_fmt, type); 4853 } 4854 4855 /* 4856 * Standard function to be called on quota_on 4857 */ 4858 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 4859 struct path *path) 4860 { 4861 int err; 4862 4863 if (!test_opt(sb, QUOTA)) 4864 return -EINVAL; 4865 4866 /* Quotafile not on the same filesystem? */ 4867 if (path->dentry->d_sb != sb) 4868 return -EXDEV; 4869 /* Journaling quota? */ 4870 if (EXT4_SB(sb)->s_qf_names[type]) { 4871 /* Quotafile not in fs root? */ 4872 if (path->dentry->d_parent != sb->s_root) 4873 ext4_msg(sb, KERN_WARNING, 4874 "Quota file not on filesystem root. " 4875 "Journaled quota will not work"); 4876 } 4877 4878 /* 4879 * When we journal data on quota file, we have to flush journal to see 4880 * all updates to the file when we bypass pagecache... 4881 */ 4882 if (EXT4_SB(sb)->s_journal && 4883 ext4_should_journal_data(path->dentry->d_inode)) { 4884 /* 4885 * We don't need to lock updates but journal_flush() could 4886 * otherwise be livelocked... 4887 */ 4888 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 4889 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 4890 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4891 if (err) 4892 return err; 4893 } 4894 4895 return dquot_quota_on(sb, type, format_id, path); 4896 } 4897 4898 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 4899 unsigned int flags) 4900 { 4901 int err; 4902 struct inode *qf_inode; 4903 unsigned long qf_inums[MAXQUOTAS] = { 4904 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 4905 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum) 4906 }; 4907 4908 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)); 4909 4910 if (!qf_inums[type]) 4911 return -EPERM; 4912 4913 qf_inode = ext4_iget(sb, qf_inums[type]); 4914 if (IS_ERR(qf_inode)) { 4915 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); 4916 return PTR_ERR(qf_inode); 4917 } 4918 4919 err = dquot_enable(qf_inode, type, format_id, flags); 4920 iput(qf_inode); 4921 4922 return err; 4923 } 4924 4925 /* Enable usage tracking for all quota types. */ 4926 static int ext4_enable_quotas(struct super_block *sb) 4927 { 4928 int type, err = 0; 4929 unsigned long qf_inums[MAXQUOTAS] = { 4930 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 4931 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum) 4932 }; 4933 4934 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 4935 for (type = 0; type < MAXQUOTAS; type++) { 4936 if (qf_inums[type]) { 4937 err = ext4_quota_enable(sb, type, QFMT_VFS_V1, 4938 DQUOT_USAGE_ENABLED); 4939 if (err) { 4940 ext4_warning(sb, 4941 "Failed to enable quota tracking " 4942 "(type=%d, err=%d). Please run " 4943 "e2fsck to fix.", type, err); 4944 return err; 4945 } 4946 } 4947 } 4948 return 0; 4949 } 4950 4951 /* 4952 * quota_on function that is used when QUOTA feature is set. 4953 */ 4954 static int ext4_quota_on_sysfile(struct super_block *sb, int type, 4955 int format_id) 4956 { 4957 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) 4958 return -EINVAL; 4959 4960 /* 4961 * USAGE was enabled at mount time. Only need to enable LIMITS now. 4962 */ 4963 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED); 4964 } 4965 4966 static int ext4_quota_off(struct super_block *sb, int type) 4967 { 4968 struct inode *inode = sb_dqopt(sb)->files[type]; 4969 handle_t *handle; 4970 4971 /* Force all delayed allocation blocks to be allocated. 4972 * Caller already holds s_umount sem */ 4973 if (test_opt(sb, DELALLOC)) 4974 sync_filesystem(sb); 4975 4976 if (!inode) 4977 goto out; 4978 4979 /* Update modification times of quota files when userspace can 4980 * start looking at them */ 4981 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 4982 if (IS_ERR(handle)) 4983 goto out; 4984 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4985 ext4_mark_inode_dirty(handle, inode); 4986 ext4_journal_stop(handle); 4987 4988 out: 4989 return dquot_quota_off(sb, type); 4990 } 4991 4992 /* 4993 * quota_off function that is used when QUOTA feature is set. 4994 */ 4995 static int ext4_quota_off_sysfile(struct super_block *sb, int type) 4996 { 4997 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) 4998 return -EINVAL; 4999 5000 /* Disable only the limits. */ 5001 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 5002 } 5003 5004 /* Read data from quotafile - avoid pagecache and such because we cannot afford 5005 * acquiring the locks... As quota files are never truncated and quota code 5006 * itself serializes the operations (and no one else should touch the files) 5007 * we don't have to be afraid of races */ 5008 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 5009 size_t len, loff_t off) 5010 { 5011 struct inode *inode = sb_dqopt(sb)->files[type]; 5012 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5013 int err = 0; 5014 int offset = off & (sb->s_blocksize - 1); 5015 int tocopy; 5016 size_t toread; 5017 struct buffer_head *bh; 5018 loff_t i_size = i_size_read(inode); 5019 5020 if (off > i_size) 5021 return 0; 5022 if (off+len > i_size) 5023 len = i_size-off; 5024 toread = len; 5025 while (toread > 0) { 5026 tocopy = sb->s_blocksize - offset < toread ? 5027 sb->s_blocksize - offset : toread; 5028 bh = ext4_bread(NULL, inode, blk, 0, &err); 5029 if (err) 5030 return err; 5031 if (!bh) /* A hole? */ 5032 memset(data, 0, tocopy); 5033 else 5034 memcpy(data, bh->b_data+offset, tocopy); 5035 brelse(bh); 5036 offset = 0; 5037 toread -= tocopy; 5038 data += tocopy; 5039 blk++; 5040 } 5041 return len; 5042 } 5043 5044 /* Write to quotafile (we know the transaction is already started and has 5045 * enough credits) */ 5046 static ssize_t ext4_quota_write(struct super_block *sb, int type, 5047 const char *data, size_t len, loff_t off) 5048 { 5049 struct inode *inode = sb_dqopt(sb)->files[type]; 5050 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5051 int err = 0; 5052 int offset = off & (sb->s_blocksize - 1); 5053 struct buffer_head *bh; 5054 handle_t *handle = journal_current_handle(); 5055 5056 if (EXT4_SB(sb)->s_journal && !handle) { 5057 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5058 " cancelled because transaction is not started", 5059 (unsigned long long)off, (unsigned long long)len); 5060 return -EIO; 5061 } 5062 /* 5063 * Since we account only one data block in transaction credits, 5064 * then it is impossible to cross a block boundary. 5065 */ 5066 if (sb->s_blocksize - offset < len) { 5067 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5068 " cancelled because not block aligned", 5069 (unsigned long long)off, (unsigned long long)len); 5070 return -EIO; 5071 } 5072 5073 bh = ext4_bread(handle, inode, blk, 1, &err); 5074 if (!bh) 5075 goto out; 5076 err = ext4_journal_get_write_access(handle, bh); 5077 if (err) { 5078 brelse(bh); 5079 goto out; 5080 } 5081 lock_buffer(bh); 5082 memcpy(bh->b_data+offset, data, len); 5083 flush_dcache_page(bh->b_page); 5084 unlock_buffer(bh); 5085 err = ext4_handle_dirty_metadata(handle, NULL, bh); 5086 brelse(bh); 5087 out: 5088 if (err) 5089 return err; 5090 if (inode->i_size < off + len) { 5091 i_size_write(inode, off + len); 5092 EXT4_I(inode)->i_disksize = inode->i_size; 5093 ext4_mark_inode_dirty(handle, inode); 5094 } 5095 return len; 5096 } 5097 5098 #endif 5099 5100 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 5101 const char *dev_name, void *data) 5102 { 5103 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 5104 } 5105 5106 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 5107 static inline void register_as_ext2(void) 5108 { 5109 int err = register_filesystem(&ext2_fs_type); 5110 if (err) 5111 printk(KERN_WARNING 5112 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 5113 } 5114 5115 static inline void unregister_as_ext2(void) 5116 { 5117 unregister_filesystem(&ext2_fs_type); 5118 } 5119 5120 static inline int ext2_feature_set_ok(struct super_block *sb) 5121 { 5122 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP)) 5123 return 0; 5124 if (sb->s_flags & MS_RDONLY) 5125 return 1; 5126 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP)) 5127 return 0; 5128 return 1; 5129 } 5130 MODULE_ALIAS("ext2"); 5131 #else 5132 static inline void register_as_ext2(void) { } 5133 static inline void unregister_as_ext2(void) { } 5134 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 5135 #endif 5136 5137 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 5138 static inline void register_as_ext3(void) 5139 { 5140 int err = register_filesystem(&ext3_fs_type); 5141 if (err) 5142 printk(KERN_WARNING 5143 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 5144 } 5145 5146 static inline void unregister_as_ext3(void) 5147 { 5148 unregister_filesystem(&ext3_fs_type); 5149 } 5150 5151 static inline int ext3_feature_set_ok(struct super_block *sb) 5152 { 5153 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP)) 5154 return 0; 5155 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 5156 return 0; 5157 if (sb->s_flags & MS_RDONLY) 5158 return 1; 5159 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) 5160 return 0; 5161 return 1; 5162 } 5163 MODULE_ALIAS("ext3"); 5164 #else 5165 static inline void register_as_ext3(void) { } 5166 static inline void unregister_as_ext3(void) { } 5167 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; } 5168 #endif 5169 5170 static struct file_system_type ext4_fs_type = { 5171 .owner = THIS_MODULE, 5172 .name = "ext4", 5173 .mount = ext4_mount, 5174 .kill_sb = kill_block_super, 5175 .fs_flags = FS_REQUIRES_DEV, 5176 }; 5177 5178 static int __init ext4_init_feat_adverts(void) 5179 { 5180 struct ext4_features *ef; 5181 int ret = -ENOMEM; 5182 5183 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); 5184 if (!ef) 5185 goto out; 5186 5187 ef->f_kobj.kset = ext4_kset; 5188 init_completion(&ef->f_kobj_unregister); 5189 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, 5190 "features"); 5191 if (ret) { 5192 kfree(ef); 5193 goto out; 5194 } 5195 5196 ext4_feat = ef; 5197 ret = 0; 5198 out: 5199 return ret; 5200 } 5201 5202 static void ext4_exit_feat_adverts(void) 5203 { 5204 kobject_put(&ext4_feat->f_kobj); 5205 wait_for_completion(&ext4_feat->f_kobj_unregister); 5206 kfree(ext4_feat); 5207 } 5208 5209 /* Shared across all ext4 file systems */ 5210 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 5211 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 5212 5213 static int __init ext4_init_fs(void) 5214 { 5215 int i, err; 5216 5217 ext4_li_info = NULL; 5218 mutex_init(&ext4_li_mtx); 5219 5220 /* Build-time check for flags consistency */ 5221 ext4_check_flag_values(); 5222 5223 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) { 5224 mutex_init(&ext4__aio_mutex[i]); 5225 init_waitqueue_head(&ext4__ioend_wq[i]); 5226 } 5227 5228 err = ext4_init_es(); 5229 if (err) 5230 return err; 5231 5232 err = ext4_init_pageio(); 5233 if (err) 5234 goto out7; 5235 5236 err = ext4_init_system_zone(); 5237 if (err) 5238 goto out6; 5239 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 5240 if (!ext4_kset) { 5241 err = -ENOMEM; 5242 goto out5; 5243 } 5244 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 5245 5246 err = ext4_init_feat_adverts(); 5247 if (err) 5248 goto out4; 5249 5250 err = ext4_init_mballoc(); 5251 if (err) 5252 goto out3; 5253 5254 err = ext4_init_xattr(); 5255 if (err) 5256 goto out2; 5257 err = init_inodecache(); 5258 if (err) 5259 goto out1; 5260 register_as_ext3(); 5261 register_as_ext2(); 5262 err = register_filesystem(&ext4_fs_type); 5263 if (err) 5264 goto out; 5265 5266 return 0; 5267 out: 5268 unregister_as_ext2(); 5269 unregister_as_ext3(); 5270 destroy_inodecache(); 5271 out1: 5272 ext4_exit_xattr(); 5273 out2: 5274 ext4_exit_mballoc(); 5275 out3: 5276 ext4_exit_feat_adverts(); 5277 out4: 5278 if (ext4_proc_root) 5279 remove_proc_entry("fs/ext4", NULL); 5280 kset_unregister(ext4_kset); 5281 out5: 5282 ext4_exit_system_zone(); 5283 out6: 5284 ext4_exit_pageio(); 5285 out7: 5286 ext4_exit_es(); 5287 5288 return err; 5289 } 5290 5291 static void __exit ext4_exit_fs(void) 5292 { 5293 ext4_destroy_lazyinit_thread(); 5294 unregister_as_ext2(); 5295 unregister_as_ext3(); 5296 unregister_filesystem(&ext4_fs_type); 5297 destroy_inodecache(); 5298 ext4_exit_xattr(); 5299 ext4_exit_mballoc(); 5300 ext4_exit_feat_adverts(); 5301 remove_proc_entry("fs/ext4", NULL); 5302 kset_unregister(ext4_kset); 5303 ext4_exit_system_zone(); 5304 ext4_exit_pageio(); 5305 } 5306 5307 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 5308 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5309 MODULE_LICENSE("GPL"); 5310 module_init(ext4_init_fs) 5311 module_exit(ext4_exit_fs) 5312