1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/vmalloc.h> 24 #include <linux/slab.h> 25 #include <linux/init.h> 26 #include <linux/blkdev.h> 27 #include <linux/backing-dev.h> 28 #include <linux/parser.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <linux/vfs.h> 32 #include <linux/random.h> 33 #include <linux/mount.h> 34 #include <linux/namei.h> 35 #include <linux/quotaops.h> 36 #include <linux/seq_file.h> 37 #include <linux/ctype.h> 38 #include <linux/log2.h> 39 #include <linux/crc16.h> 40 #include <linux/cleancache.h> 41 #include <asm/uaccess.h> 42 43 #include <linux/kthread.h> 44 #include <linux/freezer.h> 45 46 #include "ext4.h" 47 #include "ext4_extents.h" /* Needed for trace points definition */ 48 #include "ext4_jbd2.h" 49 #include "xattr.h" 50 #include "acl.h" 51 #include "mballoc.h" 52 53 #define CREATE_TRACE_POINTS 54 #include <trace/events/ext4.h> 55 56 static struct ext4_lazy_init *ext4_li_info; 57 static struct mutex ext4_li_mtx; 58 static struct ratelimit_state ext4_mount_msg_ratelimit; 59 60 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 61 unsigned long journal_devnum); 62 static int ext4_show_options(struct seq_file *seq, struct dentry *root); 63 static int ext4_commit_super(struct super_block *sb, int sync); 64 static void ext4_mark_recovery_complete(struct super_block *sb, 65 struct ext4_super_block *es); 66 static void ext4_clear_journal_err(struct super_block *sb, 67 struct ext4_super_block *es); 68 static int ext4_sync_fs(struct super_block *sb, int wait); 69 static int ext4_remount(struct super_block *sb, int *flags, char *data); 70 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 71 static int ext4_unfreeze(struct super_block *sb); 72 static int ext4_freeze(struct super_block *sb); 73 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 74 const char *dev_name, void *data); 75 static inline int ext2_feature_set_ok(struct super_block *sb); 76 static inline int ext3_feature_set_ok(struct super_block *sb); 77 static int ext4_feature_set_ok(struct super_block *sb, int readonly); 78 static void ext4_destroy_lazyinit_thread(void); 79 static void ext4_unregister_li_request(struct super_block *sb); 80 static void ext4_clear_request_list(void); 81 82 /* 83 * Lock ordering 84 * 85 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and 86 * i_mmap_rwsem (inode->i_mmap_rwsem)! 87 * 88 * page fault path: 89 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start -> 90 * page lock -> i_data_sem (rw) 91 * 92 * buffered write path: 93 * sb_start_write -> i_mutex -> mmap_sem 94 * sb_start_write -> i_mutex -> transaction start -> page lock -> 95 * i_data_sem (rw) 96 * 97 * truncate: 98 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> 99 * i_mmap_rwsem (w) -> page lock 100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> 101 * transaction start -> i_data_sem (rw) 102 * 103 * direct IO: 104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem 105 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> 106 * transaction start -> i_data_sem (rw) 107 * 108 * writepages: 109 * transaction start -> page lock(s) -> i_data_sem (rw) 110 */ 111 112 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 113 static struct file_system_type ext2_fs_type = { 114 .owner = THIS_MODULE, 115 .name = "ext2", 116 .mount = ext4_mount, 117 .kill_sb = kill_block_super, 118 .fs_flags = FS_REQUIRES_DEV, 119 }; 120 MODULE_ALIAS_FS("ext2"); 121 MODULE_ALIAS("ext2"); 122 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 123 #else 124 #define IS_EXT2_SB(sb) (0) 125 #endif 126 127 128 static struct file_system_type ext3_fs_type = { 129 .owner = THIS_MODULE, 130 .name = "ext3", 131 .mount = ext4_mount, 132 .kill_sb = kill_block_super, 133 .fs_flags = FS_REQUIRES_DEV, 134 }; 135 MODULE_ALIAS_FS("ext3"); 136 MODULE_ALIAS("ext3"); 137 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 138 139 static int ext4_verify_csum_type(struct super_block *sb, 140 struct ext4_super_block *es) 141 { 142 if (!ext4_has_feature_metadata_csum(sb)) 143 return 1; 144 145 return es->s_checksum_type == EXT4_CRC32C_CHKSUM; 146 } 147 148 static __le32 ext4_superblock_csum(struct super_block *sb, 149 struct ext4_super_block *es) 150 { 151 struct ext4_sb_info *sbi = EXT4_SB(sb); 152 int offset = offsetof(struct ext4_super_block, s_checksum); 153 __u32 csum; 154 155 csum = ext4_chksum(sbi, ~0, (char *)es, offset); 156 157 return cpu_to_le32(csum); 158 } 159 160 static int ext4_superblock_csum_verify(struct super_block *sb, 161 struct ext4_super_block *es) 162 { 163 if (!ext4_has_metadata_csum(sb)) 164 return 1; 165 166 return es->s_checksum == ext4_superblock_csum(sb, es); 167 } 168 169 void ext4_superblock_csum_set(struct super_block *sb) 170 { 171 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 172 173 if (!ext4_has_metadata_csum(sb)) 174 return; 175 176 es->s_checksum = ext4_superblock_csum(sb, es); 177 } 178 179 void *ext4_kvmalloc(size_t size, gfp_t flags) 180 { 181 void *ret; 182 183 ret = kmalloc(size, flags | __GFP_NOWARN); 184 if (!ret) 185 ret = __vmalloc(size, flags, PAGE_KERNEL); 186 return ret; 187 } 188 189 void *ext4_kvzalloc(size_t size, gfp_t flags) 190 { 191 void *ret; 192 193 ret = kzalloc(size, flags | __GFP_NOWARN); 194 if (!ret) 195 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 196 return ret; 197 } 198 199 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 200 struct ext4_group_desc *bg) 201 { 202 return le32_to_cpu(bg->bg_block_bitmap_lo) | 203 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 204 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 205 } 206 207 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 208 struct ext4_group_desc *bg) 209 { 210 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 211 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 212 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 213 } 214 215 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 216 struct ext4_group_desc *bg) 217 { 218 return le32_to_cpu(bg->bg_inode_table_lo) | 219 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 220 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 221 } 222 223 __u32 ext4_free_group_clusters(struct super_block *sb, 224 struct ext4_group_desc *bg) 225 { 226 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 227 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 228 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 229 } 230 231 __u32 ext4_free_inodes_count(struct super_block *sb, 232 struct ext4_group_desc *bg) 233 { 234 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 235 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 236 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 237 } 238 239 __u32 ext4_used_dirs_count(struct super_block *sb, 240 struct ext4_group_desc *bg) 241 { 242 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 243 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 244 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 245 } 246 247 __u32 ext4_itable_unused_count(struct super_block *sb, 248 struct ext4_group_desc *bg) 249 { 250 return le16_to_cpu(bg->bg_itable_unused_lo) | 251 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 252 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 253 } 254 255 void ext4_block_bitmap_set(struct super_block *sb, 256 struct ext4_group_desc *bg, ext4_fsblk_t blk) 257 { 258 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 259 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 260 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 261 } 262 263 void ext4_inode_bitmap_set(struct super_block *sb, 264 struct ext4_group_desc *bg, ext4_fsblk_t blk) 265 { 266 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 267 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 268 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 269 } 270 271 void ext4_inode_table_set(struct super_block *sb, 272 struct ext4_group_desc *bg, ext4_fsblk_t blk) 273 { 274 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 275 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 276 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 277 } 278 279 void ext4_free_group_clusters_set(struct super_block *sb, 280 struct ext4_group_desc *bg, __u32 count) 281 { 282 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 283 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 284 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 285 } 286 287 void ext4_free_inodes_set(struct super_block *sb, 288 struct ext4_group_desc *bg, __u32 count) 289 { 290 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 291 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 292 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 293 } 294 295 void ext4_used_dirs_set(struct super_block *sb, 296 struct ext4_group_desc *bg, __u32 count) 297 { 298 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 299 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 300 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 301 } 302 303 void ext4_itable_unused_set(struct super_block *sb, 304 struct ext4_group_desc *bg, __u32 count) 305 { 306 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 307 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 308 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 309 } 310 311 312 static void __save_error_info(struct super_block *sb, const char *func, 313 unsigned int line) 314 { 315 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 316 317 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 318 if (bdev_read_only(sb->s_bdev)) 319 return; 320 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 321 es->s_last_error_time = cpu_to_le32(get_seconds()); 322 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 323 es->s_last_error_line = cpu_to_le32(line); 324 if (!es->s_first_error_time) { 325 es->s_first_error_time = es->s_last_error_time; 326 strncpy(es->s_first_error_func, func, 327 sizeof(es->s_first_error_func)); 328 es->s_first_error_line = cpu_to_le32(line); 329 es->s_first_error_ino = es->s_last_error_ino; 330 es->s_first_error_block = es->s_last_error_block; 331 } 332 /* 333 * Start the daily error reporting function if it hasn't been 334 * started already 335 */ 336 if (!es->s_error_count) 337 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 338 le32_add_cpu(&es->s_error_count, 1); 339 } 340 341 static void save_error_info(struct super_block *sb, const char *func, 342 unsigned int line) 343 { 344 __save_error_info(sb, func, line); 345 ext4_commit_super(sb, 1); 346 } 347 348 /* 349 * The del_gendisk() function uninitializes the disk-specific data 350 * structures, including the bdi structure, without telling anyone 351 * else. Once this happens, any attempt to call mark_buffer_dirty() 352 * (for example, by ext4_commit_super), will cause a kernel OOPS. 353 * This is a kludge to prevent these oops until we can put in a proper 354 * hook in del_gendisk() to inform the VFS and file system layers. 355 */ 356 static int block_device_ejected(struct super_block *sb) 357 { 358 struct inode *bd_inode = sb->s_bdev->bd_inode; 359 struct backing_dev_info *bdi = inode_to_bdi(bd_inode); 360 361 return bdi->dev == NULL; 362 } 363 364 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 365 { 366 struct super_block *sb = journal->j_private; 367 struct ext4_sb_info *sbi = EXT4_SB(sb); 368 int error = is_journal_aborted(journal); 369 struct ext4_journal_cb_entry *jce; 370 371 BUG_ON(txn->t_state == T_FINISHED); 372 spin_lock(&sbi->s_md_lock); 373 while (!list_empty(&txn->t_private_list)) { 374 jce = list_entry(txn->t_private_list.next, 375 struct ext4_journal_cb_entry, jce_list); 376 list_del_init(&jce->jce_list); 377 spin_unlock(&sbi->s_md_lock); 378 jce->jce_func(sb, jce, error); 379 spin_lock(&sbi->s_md_lock); 380 } 381 spin_unlock(&sbi->s_md_lock); 382 } 383 384 /* Deal with the reporting of failure conditions on a filesystem such as 385 * inconsistencies detected or read IO failures. 386 * 387 * On ext2, we can store the error state of the filesystem in the 388 * superblock. That is not possible on ext4, because we may have other 389 * write ordering constraints on the superblock which prevent us from 390 * writing it out straight away; and given that the journal is about to 391 * be aborted, we can't rely on the current, or future, transactions to 392 * write out the superblock safely. 393 * 394 * We'll just use the jbd2_journal_abort() error code to record an error in 395 * the journal instead. On recovery, the journal will complain about 396 * that error until we've noted it down and cleared it. 397 */ 398 399 static void ext4_handle_error(struct super_block *sb) 400 { 401 if (sb->s_flags & MS_RDONLY) 402 return; 403 404 if (!test_opt(sb, ERRORS_CONT)) { 405 journal_t *journal = EXT4_SB(sb)->s_journal; 406 407 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 408 if (journal) 409 jbd2_journal_abort(journal, -EIO); 410 } 411 if (test_opt(sb, ERRORS_RO)) { 412 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 413 /* 414 * Make sure updated value of ->s_mount_flags will be visible 415 * before ->s_flags update 416 */ 417 smp_wmb(); 418 sb->s_flags |= MS_RDONLY; 419 } 420 if (test_opt(sb, ERRORS_PANIC)) { 421 if (EXT4_SB(sb)->s_journal && 422 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) 423 return; 424 panic("EXT4-fs (device %s): panic forced after error\n", 425 sb->s_id); 426 } 427 } 428 429 #define ext4_error_ratelimit(sb) \ 430 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ 431 "EXT4-fs error") 432 433 void __ext4_error(struct super_block *sb, const char *function, 434 unsigned int line, const char *fmt, ...) 435 { 436 struct va_format vaf; 437 va_list args; 438 439 if (ext4_error_ratelimit(sb)) { 440 va_start(args, fmt); 441 vaf.fmt = fmt; 442 vaf.va = &args; 443 printk(KERN_CRIT 444 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 445 sb->s_id, function, line, current->comm, &vaf); 446 va_end(args); 447 } 448 save_error_info(sb, function, line); 449 ext4_handle_error(sb); 450 } 451 452 void __ext4_error_inode(struct inode *inode, const char *function, 453 unsigned int line, ext4_fsblk_t block, 454 const char *fmt, ...) 455 { 456 va_list args; 457 struct va_format vaf; 458 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 459 460 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 461 es->s_last_error_block = cpu_to_le64(block); 462 if (ext4_error_ratelimit(inode->i_sb)) { 463 va_start(args, fmt); 464 vaf.fmt = fmt; 465 vaf.va = &args; 466 if (block) 467 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 468 "inode #%lu: block %llu: comm %s: %pV\n", 469 inode->i_sb->s_id, function, line, inode->i_ino, 470 block, current->comm, &vaf); 471 else 472 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 473 "inode #%lu: comm %s: %pV\n", 474 inode->i_sb->s_id, function, line, inode->i_ino, 475 current->comm, &vaf); 476 va_end(args); 477 } 478 save_error_info(inode->i_sb, function, line); 479 ext4_handle_error(inode->i_sb); 480 } 481 482 void __ext4_error_file(struct file *file, const char *function, 483 unsigned int line, ext4_fsblk_t block, 484 const char *fmt, ...) 485 { 486 va_list args; 487 struct va_format vaf; 488 struct ext4_super_block *es; 489 struct inode *inode = file_inode(file); 490 char pathname[80], *path; 491 492 es = EXT4_SB(inode->i_sb)->s_es; 493 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 494 if (ext4_error_ratelimit(inode->i_sb)) { 495 path = file_path(file, pathname, sizeof(pathname)); 496 if (IS_ERR(path)) 497 path = "(unknown)"; 498 va_start(args, fmt); 499 vaf.fmt = fmt; 500 vaf.va = &args; 501 if (block) 502 printk(KERN_CRIT 503 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 504 "block %llu: comm %s: path %s: %pV\n", 505 inode->i_sb->s_id, function, line, inode->i_ino, 506 block, current->comm, path, &vaf); 507 else 508 printk(KERN_CRIT 509 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 510 "comm %s: path %s: %pV\n", 511 inode->i_sb->s_id, function, line, inode->i_ino, 512 current->comm, path, &vaf); 513 va_end(args); 514 } 515 save_error_info(inode->i_sb, function, line); 516 ext4_handle_error(inode->i_sb); 517 } 518 519 const char *ext4_decode_error(struct super_block *sb, int errno, 520 char nbuf[16]) 521 { 522 char *errstr = NULL; 523 524 switch (errno) { 525 case -EFSCORRUPTED: 526 errstr = "Corrupt filesystem"; 527 break; 528 case -EFSBADCRC: 529 errstr = "Filesystem failed CRC"; 530 break; 531 case -EIO: 532 errstr = "IO failure"; 533 break; 534 case -ENOMEM: 535 errstr = "Out of memory"; 536 break; 537 case -EROFS: 538 if (!sb || (EXT4_SB(sb)->s_journal && 539 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 540 errstr = "Journal has aborted"; 541 else 542 errstr = "Readonly filesystem"; 543 break; 544 default: 545 /* If the caller passed in an extra buffer for unknown 546 * errors, textualise them now. Else we just return 547 * NULL. */ 548 if (nbuf) { 549 /* Check for truncated error codes... */ 550 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 551 errstr = nbuf; 552 } 553 break; 554 } 555 556 return errstr; 557 } 558 559 /* __ext4_std_error decodes expected errors from journaling functions 560 * automatically and invokes the appropriate error response. */ 561 562 void __ext4_std_error(struct super_block *sb, const char *function, 563 unsigned int line, int errno) 564 { 565 char nbuf[16]; 566 const char *errstr; 567 568 /* Special case: if the error is EROFS, and we're not already 569 * inside a transaction, then there's really no point in logging 570 * an error. */ 571 if (errno == -EROFS && journal_current_handle() == NULL && 572 (sb->s_flags & MS_RDONLY)) 573 return; 574 575 if (ext4_error_ratelimit(sb)) { 576 errstr = ext4_decode_error(sb, errno, nbuf); 577 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 578 sb->s_id, function, line, errstr); 579 } 580 581 save_error_info(sb, function, line); 582 ext4_handle_error(sb); 583 } 584 585 /* 586 * ext4_abort is a much stronger failure handler than ext4_error. The 587 * abort function may be used to deal with unrecoverable failures such 588 * as journal IO errors or ENOMEM at a critical moment in log management. 589 * 590 * We unconditionally force the filesystem into an ABORT|READONLY state, 591 * unless the error response on the fs has been set to panic in which 592 * case we take the easy way out and panic immediately. 593 */ 594 595 void __ext4_abort(struct super_block *sb, const char *function, 596 unsigned int line, const char *fmt, ...) 597 { 598 va_list args; 599 600 save_error_info(sb, function, line); 601 va_start(args, fmt); 602 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 603 function, line); 604 vprintk(fmt, args); 605 printk("\n"); 606 va_end(args); 607 608 if ((sb->s_flags & MS_RDONLY) == 0) { 609 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 610 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 611 /* 612 * Make sure updated value of ->s_mount_flags will be visible 613 * before ->s_flags update 614 */ 615 smp_wmb(); 616 sb->s_flags |= MS_RDONLY; 617 if (EXT4_SB(sb)->s_journal) 618 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 619 save_error_info(sb, function, line); 620 } 621 if (test_opt(sb, ERRORS_PANIC)) { 622 if (EXT4_SB(sb)->s_journal && 623 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) 624 return; 625 panic("EXT4-fs panic from previous error\n"); 626 } 627 } 628 629 void __ext4_msg(struct super_block *sb, 630 const char *prefix, const char *fmt, ...) 631 { 632 struct va_format vaf; 633 va_list args; 634 635 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs")) 636 return; 637 638 va_start(args, fmt); 639 vaf.fmt = fmt; 640 vaf.va = &args; 641 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 642 va_end(args); 643 } 644 645 #define ext4_warning_ratelimit(sb) \ 646 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \ 647 "EXT4-fs warning") 648 649 void __ext4_warning(struct super_block *sb, const char *function, 650 unsigned int line, const char *fmt, ...) 651 { 652 struct va_format vaf; 653 va_list args; 654 655 if (!ext4_warning_ratelimit(sb)) 656 return; 657 658 va_start(args, fmt); 659 vaf.fmt = fmt; 660 vaf.va = &args; 661 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 662 sb->s_id, function, line, &vaf); 663 va_end(args); 664 } 665 666 void __ext4_warning_inode(const struct inode *inode, const char *function, 667 unsigned int line, const char *fmt, ...) 668 { 669 struct va_format vaf; 670 va_list args; 671 672 if (!ext4_warning_ratelimit(inode->i_sb)) 673 return; 674 675 va_start(args, fmt); 676 vaf.fmt = fmt; 677 vaf.va = &args; 678 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " 679 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id, 680 function, line, inode->i_ino, current->comm, &vaf); 681 va_end(args); 682 } 683 684 void __ext4_grp_locked_error(const char *function, unsigned int line, 685 struct super_block *sb, ext4_group_t grp, 686 unsigned long ino, ext4_fsblk_t block, 687 const char *fmt, ...) 688 __releases(bitlock) 689 __acquires(bitlock) 690 { 691 struct va_format vaf; 692 va_list args; 693 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 694 695 es->s_last_error_ino = cpu_to_le32(ino); 696 es->s_last_error_block = cpu_to_le64(block); 697 __save_error_info(sb, function, line); 698 699 if (ext4_error_ratelimit(sb)) { 700 va_start(args, fmt); 701 vaf.fmt = fmt; 702 vaf.va = &args; 703 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 704 sb->s_id, function, line, grp); 705 if (ino) 706 printk(KERN_CONT "inode %lu: ", ino); 707 if (block) 708 printk(KERN_CONT "block %llu:", 709 (unsigned long long) block); 710 printk(KERN_CONT "%pV\n", &vaf); 711 va_end(args); 712 } 713 714 if (test_opt(sb, ERRORS_CONT)) { 715 ext4_commit_super(sb, 0); 716 return; 717 } 718 719 ext4_unlock_group(sb, grp); 720 ext4_handle_error(sb); 721 /* 722 * We only get here in the ERRORS_RO case; relocking the group 723 * may be dangerous, but nothing bad will happen since the 724 * filesystem will have already been marked read/only and the 725 * journal has been aborted. We return 1 as a hint to callers 726 * who might what to use the return value from 727 * ext4_grp_locked_error() to distinguish between the 728 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 729 * aggressively from the ext4 function in question, with a 730 * more appropriate error code. 731 */ 732 ext4_lock_group(sb, grp); 733 return; 734 } 735 736 void ext4_update_dynamic_rev(struct super_block *sb) 737 { 738 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 739 740 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 741 return; 742 743 ext4_warning(sb, 744 "updating to rev %d because of new feature flag, " 745 "running e2fsck is recommended", 746 EXT4_DYNAMIC_REV); 747 748 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 749 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 750 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 751 /* leave es->s_feature_*compat flags alone */ 752 /* es->s_uuid will be set by e2fsck if empty */ 753 754 /* 755 * The rest of the superblock fields should be zero, and if not it 756 * means they are likely already in use, so leave them alone. We 757 * can leave it up to e2fsck to clean up any inconsistencies there. 758 */ 759 } 760 761 /* 762 * Open the external journal device 763 */ 764 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 765 { 766 struct block_device *bdev; 767 char b[BDEVNAME_SIZE]; 768 769 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 770 if (IS_ERR(bdev)) 771 goto fail; 772 return bdev; 773 774 fail: 775 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 776 __bdevname(dev, b), PTR_ERR(bdev)); 777 return NULL; 778 } 779 780 /* 781 * Release the journal device 782 */ 783 static void ext4_blkdev_put(struct block_device *bdev) 784 { 785 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 786 } 787 788 static void ext4_blkdev_remove(struct ext4_sb_info *sbi) 789 { 790 struct block_device *bdev; 791 bdev = sbi->journal_bdev; 792 if (bdev) { 793 ext4_blkdev_put(bdev); 794 sbi->journal_bdev = NULL; 795 } 796 } 797 798 static inline struct inode *orphan_list_entry(struct list_head *l) 799 { 800 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 801 } 802 803 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 804 { 805 struct list_head *l; 806 807 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 808 le32_to_cpu(sbi->s_es->s_last_orphan)); 809 810 printk(KERN_ERR "sb_info orphan list:\n"); 811 list_for_each(l, &sbi->s_orphan) { 812 struct inode *inode = orphan_list_entry(l); 813 printk(KERN_ERR " " 814 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 815 inode->i_sb->s_id, inode->i_ino, inode, 816 inode->i_mode, inode->i_nlink, 817 NEXT_ORPHAN(inode)); 818 } 819 } 820 821 static void ext4_put_super(struct super_block *sb) 822 { 823 struct ext4_sb_info *sbi = EXT4_SB(sb); 824 struct ext4_super_block *es = sbi->s_es; 825 int i, err; 826 827 ext4_unregister_li_request(sb); 828 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 829 830 flush_workqueue(sbi->rsv_conversion_wq); 831 destroy_workqueue(sbi->rsv_conversion_wq); 832 833 if (sbi->s_journal) { 834 err = jbd2_journal_destroy(sbi->s_journal); 835 sbi->s_journal = NULL; 836 if (err < 0) 837 ext4_abort(sb, "Couldn't clean up the journal"); 838 } 839 840 ext4_unregister_sysfs(sb); 841 ext4_es_unregister_shrinker(sbi); 842 del_timer_sync(&sbi->s_err_report); 843 ext4_release_system_zone(sb); 844 ext4_mb_release(sb); 845 ext4_ext_release(sb); 846 847 if (!(sb->s_flags & MS_RDONLY)) { 848 ext4_clear_feature_journal_needs_recovery(sb); 849 es->s_state = cpu_to_le16(sbi->s_mount_state); 850 } 851 if (!(sb->s_flags & MS_RDONLY)) 852 ext4_commit_super(sb, 1); 853 854 for (i = 0; i < sbi->s_gdb_count; i++) 855 brelse(sbi->s_group_desc[i]); 856 kvfree(sbi->s_group_desc); 857 kvfree(sbi->s_flex_groups); 858 percpu_counter_destroy(&sbi->s_freeclusters_counter); 859 percpu_counter_destroy(&sbi->s_freeinodes_counter); 860 percpu_counter_destroy(&sbi->s_dirs_counter); 861 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 862 brelse(sbi->s_sbh); 863 #ifdef CONFIG_QUOTA 864 for (i = 0; i < EXT4_MAXQUOTAS; i++) 865 kfree(sbi->s_qf_names[i]); 866 #endif 867 868 /* Debugging code just in case the in-memory inode orphan list 869 * isn't empty. The on-disk one can be non-empty if we've 870 * detected an error and taken the fs readonly, but the 871 * in-memory list had better be clean by this point. */ 872 if (!list_empty(&sbi->s_orphan)) 873 dump_orphan_list(sb, sbi); 874 J_ASSERT(list_empty(&sbi->s_orphan)); 875 876 sync_blockdev(sb->s_bdev); 877 invalidate_bdev(sb->s_bdev); 878 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 879 /* 880 * Invalidate the journal device's buffers. We don't want them 881 * floating about in memory - the physical journal device may 882 * hotswapped, and it breaks the `ro-after' testing code. 883 */ 884 sync_blockdev(sbi->journal_bdev); 885 invalidate_bdev(sbi->journal_bdev); 886 ext4_blkdev_remove(sbi); 887 } 888 if (sbi->s_mb_cache) { 889 ext4_xattr_destroy_cache(sbi->s_mb_cache); 890 sbi->s_mb_cache = NULL; 891 } 892 if (sbi->s_mmp_tsk) 893 kthread_stop(sbi->s_mmp_tsk); 894 sb->s_fs_info = NULL; 895 /* 896 * Now that we are completely done shutting down the 897 * superblock, we need to actually destroy the kobject. 898 */ 899 kobject_put(&sbi->s_kobj); 900 wait_for_completion(&sbi->s_kobj_unregister); 901 if (sbi->s_chksum_driver) 902 crypto_free_shash(sbi->s_chksum_driver); 903 kfree(sbi->s_blockgroup_lock); 904 kfree(sbi); 905 } 906 907 static struct kmem_cache *ext4_inode_cachep; 908 909 /* 910 * Called inside transaction, so use GFP_NOFS 911 */ 912 static struct inode *ext4_alloc_inode(struct super_block *sb) 913 { 914 struct ext4_inode_info *ei; 915 916 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 917 if (!ei) 918 return NULL; 919 920 ei->vfs_inode.i_version = 1; 921 spin_lock_init(&ei->i_raw_lock); 922 INIT_LIST_HEAD(&ei->i_prealloc_list); 923 spin_lock_init(&ei->i_prealloc_lock); 924 ext4_es_init_tree(&ei->i_es_tree); 925 rwlock_init(&ei->i_es_lock); 926 INIT_LIST_HEAD(&ei->i_es_list); 927 ei->i_es_all_nr = 0; 928 ei->i_es_shk_nr = 0; 929 ei->i_es_shrink_lblk = 0; 930 ei->i_reserved_data_blocks = 0; 931 ei->i_reserved_meta_blocks = 0; 932 ei->i_allocated_meta_blocks = 0; 933 ei->i_da_metadata_calc_len = 0; 934 ei->i_da_metadata_calc_last_lblock = 0; 935 spin_lock_init(&(ei->i_block_reservation_lock)); 936 #ifdef CONFIG_QUOTA 937 ei->i_reserved_quota = 0; 938 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 939 #endif 940 ei->jinode = NULL; 941 INIT_LIST_HEAD(&ei->i_rsv_conversion_list); 942 spin_lock_init(&ei->i_completed_io_lock); 943 ei->i_sync_tid = 0; 944 ei->i_datasync_tid = 0; 945 atomic_set(&ei->i_unwritten, 0); 946 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); 947 #ifdef CONFIG_EXT4_FS_ENCRYPTION 948 ei->i_crypt_info = NULL; 949 #endif 950 return &ei->vfs_inode; 951 } 952 953 static int ext4_drop_inode(struct inode *inode) 954 { 955 int drop = generic_drop_inode(inode); 956 957 trace_ext4_drop_inode(inode, drop); 958 return drop; 959 } 960 961 static void ext4_i_callback(struct rcu_head *head) 962 { 963 struct inode *inode = container_of(head, struct inode, i_rcu); 964 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 965 } 966 967 static void ext4_destroy_inode(struct inode *inode) 968 { 969 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 970 ext4_msg(inode->i_sb, KERN_ERR, 971 "Inode %lu (%p): orphan list check failed!", 972 inode->i_ino, EXT4_I(inode)); 973 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 974 EXT4_I(inode), sizeof(struct ext4_inode_info), 975 true); 976 dump_stack(); 977 } 978 call_rcu(&inode->i_rcu, ext4_i_callback); 979 } 980 981 static void init_once(void *foo) 982 { 983 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 984 985 INIT_LIST_HEAD(&ei->i_orphan); 986 init_rwsem(&ei->xattr_sem); 987 init_rwsem(&ei->i_data_sem); 988 init_rwsem(&ei->i_mmap_sem); 989 inode_init_once(&ei->vfs_inode); 990 } 991 992 static int __init init_inodecache(void) 993 { 994 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 995 sizeof(struct ext4_inode_info), 996 0, (SLAB_RECLAIM_ACCOUNT| 997 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 998 init_once); 999 if (ext4_inode_cachep == NULL) 1000 return -ENOMEM; 1001 return 0; 1002 } 1003 1004 static void destroy_inodecache(void) 1005 { 1006 /* 1007 * Make sure all delayed rcu free inodes are flushed before we 1008 * destroy cache. 1009 */ 1010 rcu_barrier(); 1011 kmem_cache_destroy(ext4_inode_cachep); 1012 } 1013 1014 void ext4_clear_inode(struct inode *inode) 1015 { 1016 invalidate_inode_buffers(inode); 1017 clear_inode(inode); 1018 dquot_drop(inode); 1019 ext4_discard_preallocations(inode); 1020 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); 1021 if (EXT4_I(inode)->jinode) { 1022 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 1023 EXT4_I(inode)->jinode); 1024 jbd2_free_inode(EXT4_I(inode)->jinode); 1025 EXT4_I(inode)->jinode = NULL; 1026 } 1027 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1028 if (EXT4_I(inode)->i_crypt_info) 1029 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info); 1030 #endif 1031 } 1032 1033 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1034 u64 ino, u32 generation) 1035 { 1036 struct inode *inode; 1037 1038 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1039 return ERR_PTR(-ESTALE); 1040 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1041 return ERR_PTR(-ESTALE); 1042 1043 /* iget isn't really right if the inode is currently unallocated!! 1044 * 1045 * ext4_read_inode will return a bad_inode if the inode had been 1046 * deleted, so we should be safe. 1047 * 1048 * Currently we don't know the generation for parent directory, so 1049 * a generation of 0 means "accept any" 1050 */ 1051 inode = ext4_iget_normal(sb, ino); 1052 if (IS_ERR(inode)) 1053 return ERR_CAST(inode); 1054 if (generation && inode->i_generation != generation) { 1055 iput(inode); 1056 return ERR_PTR(-ESTALE); 1057 } 1058 1059 return inode; 1060 } 1061 1062 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1063 int fh_len, int fh_type) 1064 { 1065 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1066 ext4_nfs_get_inode); 1067 } 1068 1069 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1070 int fh_len, int fh_type) 1071 { 1072 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1073 ext4_nfs_get_inode); 1074 } 1075 1076 /* 1077 * Try to release metadata pages (indirect blocks, directories) which are 1078 * mapped via the block device. Since these pages could have journal heads 1079 * which would prevent try_to_free_buffers() from freeing them, we must use 1080 * jbd2 layer's try_to_free_buffers() function to release them. 1081 */ 1082 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1083 gfp_t wait) 1084 { 1085 journal_t *journal = EXT4_SB(sb)->s_journal; 1086 1087 WARN_ON(PageChecked(page)); 1088 if (!page_has_buffers(page)) 1089 return 0; 1090 if (journal) 1091 return jbd2_journal_try_to_free_buffers(journal, page, 1092 wait & ~__GFP_DIRECT_RECLAIM); 1093 return try_to_free_buffers(page); 1094 } 1095 1096 #ifdef CONFIG_QUOTA 1097 static char *quotatypes[] = INITQFNAMES; 1098 #define QTYPE2NAME(t) (quotatypes[t]) 1099 1100 static int ext4_write_dquot(struct dquot *dquot); 1101 static int ext4_acquire_dquot(struct dquot *dquot); 1102 static int ext4_release_dquot(struct dquot *dquot); 1103 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1104 static int ext4_write_info(struct super_block *sb, int type); 1105 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1106 struct path *path); 1107 static int ext4_quota_off(struct super_block *sb, int type); 1108 static int ext4_quota_on_mount(struct super_block *sb, int type); 1109 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1110 size_t len, loff_t off); 1111 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1112 const char *data, size_t len, loff_t off); 1113 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 1114 unsigned int flags); 1115 static int ext4_enable_quotas(struct super_block *sb); 1116 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid); 1117 1118 static struct dquot **ext4_get_dquots(struct inode *inode) 1119 { 1120 return EXT4_I(inode)->i_dquot; 1121 } 1122 1123 static const struct dquot_operations ext4_quota_operations = { 1124 .get_reserved_space = ext4_get_reserved_space, 1125 .write_dquot = ext4_write_dquot, 1126 .acquire_dquot = ext4_acquire_dquot, 1127 .release_dquot = ext4_release_dquot, 1128 .mark_dirty = ext4_mark_dquot_dirty, 1129 .write_info = ext4_write_info, 1130 .alloc_dquot = dquot_alloc, 1131 .destroy_dquot = dquot_destroy, 1132 .get_projid = ext4_get_projid, 1133 .get_next_id = ext4_get_next_id, 1134 }; 1135 1136 static const struct quotactl_ops ext4_qctl_operations = { 1137 .quota_on = ext4_quota_on, 1138 .quota_off = ext4_quota_off, 1139 .quota_sync = dquot_quota_sync, 1140 .get_state = dquot_get_state, 1141 .set_info = dquot_set_dqinfo, 1142 .get_dqblk = dquot_get_dqblk, 1143 .set_dqblk = dquot_set_dqblk, 1144 .get_nextdqblk = dquot_get_next_dqblk, 1145 }; 1146 #endif 1147 1148 static const struct super_operations ext4_sops = { 1149 .alloc_inode = ext4_alloc_inode, 1150 .destroy_inode = ext4_destroy_inode, 1151 .write_inode = ext4_write_inode, 1152 .dirty_inode = ext4_dirty_inode, 1153 .drop_inode = ext4_drop_inode, 1154 .evict_inode = ext4_evict_inode, 1155 .put_super = ext4_put_super, 1156 .sync_fs = ext4_sync_fs, 1157 .freeze_fs = ext4_freeze, 1158 .unfreeze_fs = ext4_unfreeze, 1159 .statfs = ext4_statfs, 1160 .remount_fs = ext4_remount, 1161 .show_options = ext4_show_options, 1162 #ifdef CONFIG_QUOTA 1163 .quota_read = ext4_quota_read, 1164 .quota_write = ext4_quota_write, 1165 .get_dquots = ext4_get_dquots, 1166 #endif 1167 .bdev_try_to_free_page = bdev_try_to_free_page, 1168 }; 1169 1170 static const struct export_operations ext4_export_ops = { 1171 .fh_to_dentry = ext4_fh_to_dentry, 1172 .fh_to_parent = ext4_fh_to_parent, 1173 .get_parent = ext4_get_parent, 1174 }; 1175 1176 enum { 1177 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1178 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1179 Opt_nouid32, Opt_debug, Opt_removed, 1180 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1181 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 1182 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, 1183 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, 1184 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1185 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, 1186 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1187 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1188 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1189 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax, 1190 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 1191 Opt_lazytime, Opt_nolazytime, 1192 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1193 Opt_inode_readahead_blks, Opt_journal_ioprio, 1194 Opt_dioread_nolock, Opt_dioread_lock, 1195 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1196 Opt_max_dir_size_kb, Opt_nojournal_checksum, 1197 }; 1198 1199 static const match_table_t tokens = { 1200 {Opt_bsd_df, "bsddf"}, 1201 {Opt_minix_df, "minixdf"}, 1202 {Opt_grpid, "grpid"}, 1203 {Opt_grpid, "bsdgroups"}, 1204 {Opt_nogrpid, "nogrpid"}, 1205 {Opt_nogrpid, "sysvgroups"}, 1206 {Opt_resgid, "resgid=%u"}, 1207 {Opt_resuid, "resuid=%u"}, 1208 {Opt_sb, "sb=%u"}, 1209 {Opt_err_cont, "errors=continue"}, 1210 {Opt_err_panic, "errors=panic"}, 1211 {Opt_err_ro, "errors=remount-ro"}, 1212 {Opt_nouid32, "nouid32"}, 1213 {Opt_debug, "debug"}, 1214 {Opt_removed, "oldalloc"}, 1215 {Opt_removed, "orlov"}, 1216 {Opt_user_xattr, "user_xattr"}, 1217 {Opt_nouser_xattr, "nouser_xattr"}, 1218 {Opt_acl, "acl"}, 1219 {Opt_noacl, "noacl"}, 1220 {Opt_noload, "norecovery"}, 1221 {Opt_noload, "noload"}, 1222 {Opt_removed, "nobh"}, 1223 {Opt_removed, "bh"}, 1224 {Opt_commit, "commit=%u"}, 1225 {Opt_min_batch_time, "min_batch_time=%u"}, 1226 {Opt_max_batch_time, "max_batch_time=%u"}, 1227 {Opt_journal_dev, "journal_dev=%u"}, 1228 {Opt_journal_path, "journal_path=%s"}, 1229 {Opt_journal_checksum, "journal_checksum"}, 1230 {Opt_nojournal_checksum, "nojournal_checksum"}, 1231 {Opt_journal_async_commit, "journal_async_commit"}, 1232 {Opt_abort, "abort"}, 1233 {Opt_data_journal, "data=journal"}, 1234 {Opt_data_ordered, "data=ordered"}, 1235 {Opt_data_writeback, "data=writeback"}, 1236 {Opt_data_err_abort, "data_err=abort"}, 1237 {Opt_data_err_ignore, "data_err=ignore"}, 1238 {Opt_offusrjquota, "usrjquota="}, 1239 {Opt_usrjquota, "usrjquota=%s"}, 1240 {Opt_offgrpjquota, "grpjquota="}, 1241 {Opt_grpjquota, "grpjquota=%s"}, 1242 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1243 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1244 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1245 {Opt_grpquota, "grpquota"}, 1246 {Opt_noquota, "noquota"}, 1247 {Opt_quota, "quota"}, 1248 {Opt_usrquota, "usrquota"}, 1249 {Opt_barrier, "barrier=%u"}, 1250 {Opt_barrier, "barrier"}, 1251 {Opt_nobarrier, "nobarrier"}, 1252 {Opt_i_version, "i_version"}, 1253 {Opt_dax, "dax"}, 1254 {Opt_stripe, "stripe=%u"}, 1255 {Opt_delalloc, "delalloc"}, 1256 {Opt_lazytime, "lazytime"}, 1257 {Opt_nolazytime, "nolazytime"}, 1258 {Opt_nodelalloc, "nodelalloc"}, 1259 {Opt_removed, "mblk_io_submit"}, 1260 {Opt_removed, "nomblk_io_submit"}, 1261 {Opt_block_validity, "block_validity"}, 1262 {Opt_noblock_validity, "noblock_validity"}, 1263 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1264 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1265 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1266 {Opt_auto_da_alloc, "auto_da_alloc"}, 1267 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1268 {Opt_dioread_nolock, "dioread_nolock"}, 1269 {Opt_dioread_lock, "dioread_lock"}, 1270 {Opt_discard, "discard"}, 1271 {Opt_nodiscard, "nodiscard"}, 1272 {Opt_init_itable, "init_itable=%u"}, 1273 {Opt_init_itable, "init_itable"}, 1274 {Opt_noinit_itable, "noinit_itable"}, 1275 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, 1276 {Opt_test_dummy_encryption, "test_dummy_encryption"}, 1277 {Opt_removed, "check=none"}, /* mount option from ext2/3 */ 1278 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ 1279 {Opt_removed, "reservation"}, /* mount option from ext2/3 */ 1280 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ 1281 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ 1282 {Opt_err, NULL}, 1283 }; 1284 1285 static ext4_fsblk_t get_sb_block(void **data) 1286 { 1287 ext4_fsblk_t sb_block; 1288 char *options = (char *) *data; 1289 1290 if (!options || strncmp(options, "sb=", 3) != 0) 1291 return 1; /* Default location */ 1292 1293 options += 3; 1294 /* TODO: use simple_strtoll with >32bit ext4 */ 1295 sb_block = simple_strtoul(options, &options, 0); 1296 if (*options && *options != ',') { 1297 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1298 (char *) *data); 1299 return 1; 1300 } 1301 if (*options == ',') 1302 options++; 1303 *data = (void *) options; 1304 1305 return sb_block; 1306 } 1307 1308 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1309 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1310 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1311 1312 #ifdef CONFIG_QUOTA 1313 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1314 { 1315 struct ext4_sb_info *sbi = EXT4_SB(sb); 1316 char *qname; 1317 int ret = -1; 1318 1319 if (sb_any_quota_loaded(sb) && 1320 !sbi->s_qf_names[qtype]) { 1321 ext4_msg(sb, KERN_ERR, 1322 "Cannot change journaled " 1323 "quota options when quota turned on"); 1324 return -1; 1325 } 1326 if (ext4_has_feature_quota(sb)) { 1327 ext4_msg(sb, KERN_INFO, "Journaled quota options " 1328 "ignored when QUOTA feature is enabled"); 1329 return 1; 1330 } 1331 qname = match_strdup(args); 1332 if (!qname) { 1333 ext4_msg(sb, KERN_ERR, 1334 "Not enough memory for storing quotafile name"); 1335 return -1; 1336 } 1337 if (sbi->s_qf_names[qtype]) { 1338 if (strcmp(sbi->s_qf_names[qtype], qname) == 0) 1339 ret = 1; 1340 else 1341 ext4_msg(sb, KERN_ERR, 1342 "%s quota file already specified", 1343 QTYPE2NAME(qtype)); 1344 goto errout; 1345 } 1346 if (strchr(qname, '/')) { 1347 ext4_msg(sb, KERN_ERR, 1348 "quotafile must be on filesystem root"); 1349 goto errout; 1350 } 1351 sbi->s_qf_names[qtype] = qname; 1352 set_opt(sb, QUOTA); 1353 return 1; 1354 errout: 1355 kfree(qname); 1356 return ret; 1357 } 1358 1359 static int clear_qf_name(struct super_block *sb, int qtype) 1360 { 1361 1362 struct ext4_sb_info *sbi = EXT4_SB(sb); 1363 1364 if (sb_any_quota_loaded(sb) && 1365 sbi->s_qf_names[qtype]) { 1366 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1367 " when quota turned on"); 1368 return -1; 1369 } 1370 kfree(sbi->s_qf_names[qtype]); 1371 sbi->s_qf_names[qtype] = NULL; 1372 return 1; 1373 } 1374 #endif 1375 1376 #define MOPT_SET 0x0001 1377 #define MOPT_CLEAR 0x0002 1378 #define MOPT_NOSUPPORT 0x0004 1379 #define MOPT_EXPLICIT 0x0008 1380 #define MOPT_CLEAR_ERR 0x0010 1381 #define MOPT_GTE0 0x0020 1382 #ifdef CONFIG_QUOTA 1383 #define MOPT_Q 0 1384 #define MOPT_QFMT 0x0040 1385 #else 1386 #define MOPT_Q MOPT_NOSUPPORT 1387 #define MOPT_QFMT MOPT_NOSUPPORT 1388 #endif 1389 #define MOPT_DATAJ 0x0080 1390 #define MOPT_NO_EXT2 0x0100 1391 #define MOPT_NO_EXT3 0x0200 1392 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) 1393 #define MOPT_STRING 0x0400 1394 1395 static const struct mount_opts { 1396 int token; 1397 int mount_opt; 1398 int flags; 1399 } ext4_mount_opts[] = { 1400 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, 1401 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, 1402 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, 1403 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, 1404 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, 1405 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, 1406 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, 1407 MOPT_EXT4_ONLY | MOPT_SET}, 1408 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, 1409 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1410 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, 1411 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, 1412 {Opt_delalloc, EXT4_MOUNT_DELALLOC, 1413 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1414 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, 1415 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1416 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1417 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1418 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1419 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1420 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | 1421 EXT4_MOUNT_JOURNAL_CHECKSUM), 1422 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1423 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, 1424 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, 1425 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, 1426 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, 1427 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, 1428 MOPT_NO_EXT2}, 1429 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, 1430 MOPT_NO_EXT2}, 1431 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, 1432 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, 1433 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, 1434 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, 1435 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, 1436 {Opt_commit, 0, MOPT_GTE0}, 1437 {Opt_max_batch_time, 0, MOPT_GTE0}, 1438 {Opt_min_batch_time, 0, MOPT_GTE0}, 1439 {Opt_inode_readahead_blks, 0, MOPT_GTE0}, 1440 {Opt_init_itable, 0, MOPT_GTE0}, 1441 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, 1442 {Opt_stripe, 0, MOPT_GTE0}, 1443 {Opt_resuid, 0, MOPT_GTE0}, 1444 {Opt_resgid, 0, MOPT_GTE0}, 1445 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0}, 1446 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING}, 1447 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0}, 1448 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1449 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1450 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, 1451 MOPT_NO_EXT2 | MOPT_DATAJ}, 1452 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, 1453 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, 1454 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1455 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, 1456 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, 1457 #else 1458 {Opt_acl, 0, MOPT_NOSUPPORT}, 1459 {Opt_noacl, 0, MOPT_NOSUPPORT}, 1460 #endif 1461 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, 1462 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, 1463 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, 1464 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, 1465 MOPT_SET | MOPT_Q}, 1466 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, 1467 MOPT_SET | MOPT_Q}, 1468 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 1469 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q}, 1470 {Opt_usrjquota, 0, MOPT_Q}, 1471 {Opt_grpjquota, 0, MOPT_Q}, 1472 {Opt_offusrjquota, 0, MOPT_Q}, 1473 {Opt_offgrpjquota, 0, MOPT_Q}, 1474 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, 1475 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, 1476 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, 1477 {Opt_max_dir_size_kb, 0, MOPT_GTE0}, 1478 {Opt_test_dummy_encryption, 0, MOPT_GTE0}, 1479 {Opt_err, 0, 0} 1480 }; 1481 1482 static int handle_mount_opt(struct super_block *sb, char *opt, int token, 1483 substring_t *args, unsigned long *journal_devnum, 1484 unsigned int *journal_ioprio, int is_remount) 1485 { 1486 struct ext4_sb_info *sbi = EXT4_SB(sb); 1487 const struct mount_opts *m; 1488 kuid_t uid; 1489 kgid_t gid; 1490 int arg = 0; 1491 1492 #ifdef CONFIG_QUOTA 1493 if (token == Opt_usrjquota) 1494 return set_qf_name(sb, USRQUOTA, &args[0]); 1495 else if (token == Opt_grpjquota) 1496 return set_qf_name(sb, GRPQUOTA, &args[0]); 1497 else if (token == Opt_offusrjquota) 1498 return clear_qf_name(sb, USRQUOTA); 1499 else if (token == Opt_offgrpjquota) 1500 return clear_qf_name(sb, GRPQUOTA); 1501 #endif 1502 switch (token) { 1503 case Opt_noacl: 1504 case Opt_nouser_xattr: 1505 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); 1506 break; 1507 case Opt_sb: 1508 return 1; /* handled by get_sb_block() */ 1509 case Opt_removed: 1510 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); 1511 return 1; 1512 case Opt_abort: 1513 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1514 return 1; 1515 case Opt_i_version: 1516 sb->s_flags |= MS_I_VERSION; 1517 return 1; 1518 case Opt_lazytime: 1519 sb->s_flags |= MS_LAZYTIME; 1520 return 1; 1521 case Opt_nolazytime: 1522 sb->s_flags &= ~MS_LAZYTIME; 1523 return 1; 1524 } 1525 1526 for (m = ext4_mount_opts; m->token != Opt_err; m++) 1527 if (token == m->token) 1528 break; 1529 1530 if (m->token == Opt_err) { 1531 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " 1532 "or missing value", opt); 1533 return -1; 1534 } 1535 1536 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { 1537 ext4_msg(sb, KERN_ERR, 1538 "Mount option \"%s\" incompatible with ext2", opt); 1539 return -1; 1540 } 1541 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { 1542 ext4_msg(sb, KERN_ERR, 1543 "Mount option \"%s\" incompatible with ext3", opt); 1544 return -1; 1545 } 1546 1547 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg)) 1548 return -1; 1549 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) 1550 return -1; 1551 if (m->flags & MOPT_EXPLICIT) { 1552 if (m->mount_opt & EXT4_MOUNT_DELALLOC) { 1553 set_opt2(sb, EXPLICIT_DELALLOC); 1554 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { 1555 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM); 1556 } else 1557 return -1; 1558 } 1559 if (m->flags & MOPT_CLEAR_ERR) 1560 clear_opt(sb, ERRORS_MASK); 1561 if (token == Opt_noquota && sb_any_quota_loaded(sb)) { 1562 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1563 "options when quota turned on"); 1564 return -1; 1565 } 1566 1567 if (m->flags & MOPT_NOSUPPORT) { 1568 ext4_msg(sb, KERN_ERR, "%s option not supported", opt); 1569 } else if (token == Opt_commit) { 1570 if (arg == 0) 1571 arg = JBD2_DEFAULT_MAX_COMMIT_AGE; 1572 sbi->s_commit_interval = HZ * arg; 1573 } else if (token == Opt_max_batch_time) { 1574 sbi->s_max_batch_time = arg; 1575 } else if (token == Opt_min_batch_time) { 1576 sbi->s_min_batch_time = arg; 1577 } else if (token == Opt_inode_readahead_blks) { 1578 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { 1579 ext4_msg(sb, KERN_ERR, 1580 "EXT4-fs: inode_readahead_blks must be " 1581 "0 or a power of 2 smaller than 2^31"); 1582 return -1; 1583 } 1584 sbi->s_inode_readahead_blks = arg; 1585 } else if (token == Opt_init_itable) { 1586 set_opt(sb, INIT_INODE_TABLE); 1587 if (!args->from) 1588 arg = EXT4_DEF_LI_WAIT_MULT; 1589 sbi->s_li_wait_mult = arg; 1590 } else if (token == Opt_max_dir_size_kb) { 1591 sbi->s_max_dir_size_kb = arg; 1592 } else if (token == Opt_stripe) { 1593 sbi->s_stripe = arg; 1594 } else if (token == Opt_resuid) { 1595 uid = make_kuid(current_user_ns(), arg); 1596 if (!uid_valid(uid)) { 1597 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); 1598 return -1; 1599 } 1600 sbi->s_resuid = uid; 1601 } else if (token == Opt_resgid) { 1602 gid = make_kgid(current_user_ns(), arg); 1603 if (!gid_valid(gid)) { 1604 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); 1605 return -1; 1606 } 1607 sbi->s_resgid = gid; 1608 } else if (token == Opt_journal_dev) { 1609 if (is_remount) { 1610 ext4_msg(sb, KERN_ERR, 1611 "Cannot specify journal on remount"); 1612 return -1; 1613 } 1614 *journal_devnum = arg; 1615 } else if (token == Opt_journal_path) { 1616 char *journal_path; 1617 struct inode *journal_inode; 1618 struct path path; 1619 int error; 1620 1621 if (is_remount) { 1622 ext4_msg(sb, KERN_ERR, 1623 "Cannot specify journal on remount"); 1624 return -1; 1625 } 1626 journal_path = match_strdup(&args[0]); 1627 if (!journal_path) { 1628 ext4_msg(sb, KERN_ERR, "error: could not dup " 1629 "journal device string"); 1630 return -1; 1631 } 1632 1633 error = kern_path(journal_path, LOOKUP_FOLLOW, &path); 1634 if (error) { 1635 ext4_msg(sb, KERN_ERR, "error: could not find " 1636 "journal device path: error %d", error); 1637 kfree(journal_path); 1638 return -1; 1639 } 1640 1641 journal_inode = d_inode(path.dentry); 1642 if (!S_ISBLK(journal_inode->i_mode)) { 1643 ext4_msg(sb, KERN_ERR, "error: journal path %s " 1644 "is not a block device", journal_path); 1645 path_put(&path); 1646 kfree(journal_path); 1647 return -1; 1648 } 1649 1650 *journal_devnum = new_encode_dev(journal_inode->i_rdev); 1651 path_put(&path); 1652 kfree(journal_path); 1653 } else if (token == Opt_journal_ioprio) { 1654 if (arg > 7) { 1655 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" 1656 " (must be 0-7)"); 1657 return -1; 1658 } 1659 *journal_ioprio = 1660 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); 1661 } else if (token == Opt_test_dummy_encryption) { 1662 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1663 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; 1664 ext4_msg(sb, KERN_WARNING, 1665 "Test dummy encryption mode enabled"); 1666 #else 1667 ext4_msg(sb, KERN_WARNING, 1668 "Test dummy encryption mount option ignored"); 1669 #endif 1670 } else if (m->flags & MOPT_DATAJ) { 1671 if (is_remount) { 1672 if (!sbi->s_journal) 1673 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); 1674 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) { 1675 ext4_msg(sb, KERN_ERR, 1676 "Cannot change data mode on remount"); 1677 return -1; 1678 } 1679 } else { 1680 clear_opt(sb, DATA_FLAGS); 1681 sbi->s_mount_opt |= m->mount_opt; 1682 } 1683 #ifdef CONFIG_QUOTA 1684 } else if (m->flags & MOPT_QFMT) { 1685 if (sb_any_quota_loaded(sb) && 1686 sbi->s_jquota_fmt != m->mount_opt) { 1687 ext4_msg(sb, KERN_ERR, "Cannot change journaled " 1688 "quota options when quota turned on"); 1689 return -1; 1690 } 1691 if (ext4_has_feature_quota(sb)) { 1692 ext4_msg(sb, KERN_INFO, 1693 "Quota format mount options ignored " 1694 "when QUOTA feature is enabled"); 1695 return 1; 1696 } 1697 sbi->s_jquota_fmt = m->mount_opt; 1698 #endif 1699 } else if (token == Opt_dax) { 1700 #ifdef CONFIG_FS_DAX 1701 ext4_msg(sb, KERN_WARNING, 1702 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 1703 sbi->s_mount_opt |= m->mount_opt; 1704 #else 1705 ext4_msg(sb, KERN_INFO, "dax option not supported"); 1706 return -1; 1707 #endif 1708 } else if (token == Opt_data_err_abort) { 1709 sbi->s_mount_opt |= m->mount_opt; 1710 } else if (token == Opt_data_err_ignore) { 1711 sbi->s_mount_opt &= ~m->mount_opt; 1712 } else { 1713 if (!args->from) 1714 arg = 1; 1715 if (m->flags & MOPT_CLEAR) 1716 arg = !arg; 1717 else if (unlikely(!(m->flags & MOPT_SET))) { 1718 ext4_msg(sb, KERN_WARNING, 1719 "buggy handling of option %s", opt); 1720 WARN_ON(1); 1721 return -1; 1722 } 1723 if (arg != 0) 1724 sbi->s_mount_opt |= m->mount_opt; 1725 else 1726 sbi->s_mount_opt &= ~m->mount_opt; 1727 } 1728 return 1; 1729 } 1730 1731 static int parse_options(char *options, struct super_block *sb, 1732 unsigned long *journal_devnum, 1733 unsigned int *journal_ioprio, 1734 int is_remount) 1735 { 1736 struct ext4_sb_info *sbi = EXT4_SB(sb); 1737 char *p; 1738 substring_t args[MAX_OPT_ARGS]; 1739 int token; 1740 1741 if (!options) 1742 return 1; 1743 1744 while ((p = strsep(&options, ",")) != NULL) { 1745 if (!*p) 1746 continue; 1747 /* 1748 * Initialize args struct so we know whether arg was 1749 * found; some options take optional arguments. 1750 */ 1751 args[0].to = args[0].from = NULL; 1752 token = match_token(p, tokens, args); 1753 if (handle_mount_opt(sb, p, token, args, journal_devnum, 1754 journal_ioprio, is_remount) < 0) 1755 return 0; 1756 } 1757 #ifdef CONFIG_QUOTA 1758 if (ext4_has_feature_quota(sb) && 1759 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) { 1760 ext4_msg(sb, KERN_INFO, "Quota feature enabled, usrquota and grpquota " 1761 "mount options ignored."); 1762 clear_opt(sb, USRQUOTA); 1763 clear_opt(sb, GRPQUOTA); 1764 } else if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1765 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1766 clear_opt(sb, USRQUOTA); 1767 1768 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1769 clear_opt(sb, GRPQUOTA); 1770 1771 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1772 ext4_msg(sb, KERN_ERR, "old and new quota " 1773 "format mixing"); 1774 return 0; 1775 } 1776 1777 if (!sbi->s_jquota_fmt) { 1778 ext4_msg(sb, KERN_ERR, "journaled quota format " 1779 "not specified"); 1780 return 0; 1781 } 1782 } 1783 #endif 1784 if (test_opt(sb, DIOREAD_NOLOCK)) { 1785 int blocksize = 1786 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 1787 1788 if (blocksize < PAGE_SIZE) { 1789 ext4_msg(sb, KERN_ERR, "can't mount with " 1790 "dioread_nolock if block size != PAGE_SIZE"); 1791 return 0; 1792 } 1793 } 1794 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && 1795 test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 1796 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit " 1797 "in data=ordered mode"); 1798 return 0; 1799 } 1800 return 1; 1801 } 1802 1803 static inline void ext4_show_quota_options(struct seq_file *seq, 1804 struct super_block *sb) 1805 { 1806 #if defined(CONFIG_QUOTA) 1807 struct ext4_sb_info *sbi = EXT4_SB(sb); 1808 1809 if (sbi->s_jquota_fmt) { 1810 char *fmtname = ""; 1811 1812 switch (sbi->s_jquota_fmt) { 1813 case QFMT_VFS_OLD: 1814 fmtname = "vfsold"; 1815 break; 1816 case QFMT_VFS_V0: 1817 fmtname = "vfsv0"; 1818 break; 1819 case QFMT_VFS_V1: 1820 fmtname = "vfsv1"; 1821 break; 1822 } 1823 seq_printf(seq, ",jqfmt=%s", fmtname); 1824 } 1825 1826 if (sbi->s_qf_names[USRQUOTA]) 1827 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]); 1828 1829 if (sbi->s_qf_names[GRPQUOTA]) 1830 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]); 1831 #endif 1832 } 1833 1834 static const char *token2str(int token) 1835 { 1836 const struct match_token *t; 1837 1838 for (t = tokens; t->token != Opt_err; t++) 1839 if (t->token == token && !strchr(t->pattern, '=')) 1840 break; 1841 return t->pattern; 1842 } 1843 1844 /* 1845 * Show an option if 1846 * - it's set to a non-default value OR 1847 * - if the per-sb default is different from the global default 1848 */ 1849 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, 1850 int nodefs) 1851 { 1852 struct ext4_sb_info *sbi = EXT4_SB(sb); 1853 struct ext4_super_block *es = sbi->s_es; 1854 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; 1855 const struct mount_opts *m; 1856 char sep = nodefs ? '\n' : ','; 1857 1858 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) 1859 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) 1860 1861 if (sbi->s_sb_block != 1) 1862 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); 1863 1864 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 1865 int want_set = m->flags & MOPT_SET; 1866 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || 1867 (m->flags & MOPT_CLEAR_ERR)) 1868 continue; 1869 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) 1870 continue; /* skip if same as the default */ 1871 if ((want_set && 1872 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || 1873 (!want_set && (sbi->s_mount_opt & m->mount_opt))) 1874 continue; /* select Opt_noFoo vs Opt_Foo */ 1875 SEQ_OPTS_PRINT("%s", token2str(m->token)); 1876 } 1877 1878 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || 1879 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) 1880 SEQ_OPTS_PRINT("resuid=%u", 1881 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 1882 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || 1883 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) 1884 SEQ_OPTS_PRINT("resgid=%u", 1885 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 1886 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); 1887 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) 1888 SEQ_OPTS_PUTS("errors=remount-ro"); 1889 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 1890 SEQ_OPTS_PUTS("errors=continue"); 1891 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 1892 SEQ_OPTS_PUTS("errors=panic"); 1893 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 1894 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); 1895 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) 1896 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); 1897 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) 1898 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); 1899 if (sb->s_flags & MS_I_VERSION) 1900 SEQ_OPTS_PUTS("i_version"); 1901 if (nodefs || sbi->s_stripe) 1902 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); 1903 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { 1904 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1905 SEQ_OPTS_PUTS("data=journal"); 1906 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1907 SEQ_OPTS_PUTS("data=ordered"); 1908 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1909 SEQ_OPTS_PUTS("data=writeback"); 1910 } 1911 if (nodefs || 1912 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1913 SEQ_OPTS_PRINT("inode_readahead_blks=%u", 1914 sbi->s_inode_readahead_blks); 1915 1916 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && 1917 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) 1918 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); 1919 if (nodefs || sbi->s_max_dir_size_kb) 1920 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); 1921 if (test_opt(sb, DATA_ERR_ABORT)) 1922 SEQ_OPTS_PUTS("data_err=abort"); 1923 1924 ext4_show_quota_options(seq, sb); 1925 return 0; 1926 } 1927 1928 static int ext4_show_options(struct seq_file *seq, struct dentry *root) 1929 { 1930 return _ext4_show_options(seq, root->d_sb, 0); 1931 } 1932 1933 int ext4_seq_options_show(struct seq_file *seq, void *offset) 1934 { 1935 struct super_block *sb = seq->private; 1936 int rc; 1937 1938 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); 1939 rc = _ext4_show_options(seq, sb, 1); 1940 seq_puts(seq, "\n"); 1941 return rc; 1942 } 1943 1944 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1945 int read_only) 1946 { 1947 struct ext4_sb_info *sbi = EXT4_SB(sb); 1948 int res = 0; 1949 1950 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1951 ext4_msg(sb, KERN_ERR, "revision level too high, " 1952 "forcing read-only mode"); 1953 res = MS_RDONLY; 1954 } 1955 if (read_only) 1956 goto done; 1957 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1958 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1959 "running e2fsck is recommended"); 1960 else if (sbi->s_mount_state & EXT4_ERROR_FS) 1961 ext4_msg(sb, KERN_WARNING, 1962 "warning: mounting fs with errors, " 1963 "running e2fsck is recommended"); 1964 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 1965 le16_to_cpu(es->s_mnt_count) >= 1966 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1967 ext4_msg(sb, KERN_WARNING, 1968 "warning: maximal mount count reached, " 1969 "running e2fsck is recommended"); 1970 else if (le32_to_cpu(es->s_checkinterval) && 1971 (le32_to_cpu(es->s_lastcheck) + 1972 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1973 ext4_msg(sb, KERN_WARNING, 1974 "warning: checktime reached, " 1975 "running e2fsck is recommended"); 1976 if (!sbi->s_journal) 1977 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1978 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1979 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1980 le16_add_cpu(&es->s_mnt_count, 1); 1981 es->s_mtime = cpu_to_le32(get_seconds()); 1982 ext4_update_dynamic_rev(sb); 1983 if (sbi->s_journal) 1984 ext4_set_feature_journal_needs_recovery(sb); 1985 1986 ext4_commit_super(sb, 1); 1987 done: 1988 if (test_opt(sb, DEBUG)) 1989 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1990 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 1991 sb->s_blocksize, 1992 sbi->s_groups_count, 1993 EXT4_BLOCKS_PER_GROUP(sb), 1994 EXT4_INODES_PER_GROUP(sb), 1995 sbi->s_mount_opt, sbi->s_mount_opt2); 1996 1997 cleancache_init_fs(sb); 1998 return res; 1999 } 2000 2001 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) 2002 { 2003 struct ext4_sb_info *sbi = EXT4_SB(sb); 2004 struct flex_groups *new_groups; 2005 int size; 2006 2007 if (!sbi->s_log_groups_per_flex) 2008 return 0; 2009 2010 size = ext4_flex_group(sbi, ngroup - 1) + 1; 2011 if (size <= sbi->s_flex_groups_allocated) 2012 return 0; 2013 2014 size = roundup_pow_of_two(size * sizeof(struct flex_groups)); 2015 new_groups = ext4_kvzalloc(size, GFP_KERNEL); 2016 if (!new_groups) { 2017 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", 2018 size / (int) sizeof(struct flex_groups)); 2019 return -ENOMEM; 2020 } 2021 2022 if (sbi->s_flex_groups) { 2023 memcpy(new_groups, sbi->s_flex_groups, 2024 (sbi->s_flex_groups_allocated * 2025 sizeof(struct flex_groups))); 2026 kvfree(sbi->s_flex_groups); 2027 } 2028 sbi->s_flex_groups = new_groups; 2029 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); 2030 return 0; 2031 } 2032 2033 static int ext4_fill_flex_info(struct super_block *sb) 2034 { 2035 struct ext4_sb_info *sbi = EXT4_SB(sb); 2036 struct ext4_group_desc *gdp = NULL; 2037 ext4_group_t flex_group; 2038 int i, err; 2039 2040 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 2041 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 2042 sbi->s_log_groups_per_flex = 0; 2043 return 1; 2044 } 2045 2046 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); 2047 if (err) 2048 goto failed; 2049 2050 for (i = 0; i < sbi->s_groups_count; i++) { 2051 gdp = ext4_get_group_desc(sb, i, NULL); 2052 2053 flex_group = ext4_flex_group(sbi, i); 2054 atomic_add(ext4_free_inodes_count(sb, gdp), 2055 &sbi->s_flex_groups[flex_group].free_inodes); 2056 atomic64_add(ext4_free_group_clusters(sb, gdp), 2057 &sbi->s_flex_groups[flex_group].free_clusters); 2058 atomic_add(ext4_used_dirs_count(sb, gdp), 2059 &sbi->s_flex_groups[flex_group].used_dirs); 2060 } 2061 2062 return 1; 2063 failed: 2064 return 0; 2065 } 2066 2067 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, 2068 struct ext4_group_desc *gdp) 2069 { 2070 int offset; 2071 __u16 crc = 0; 2072 __le32 le_group = cpu_to_le32(block_group); 2073 struct ext4_sb_info *sbi = EXT4_SB(sb); 2074 2075 if (ext4_has_metadata_csum(sbi->s_sb)) { 2076 /* Use new metadata_csum algorithm */ 2077 __le16 save_csum; 2078 __u32 csum32; 2079 2080 save_csum = gdp->bg_checksum; 2081 gdp->bg_checksum = 0; 2082 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, 2083 sizeof(le_group)); 2084 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, 2085 sbi->s_desc_size); 2086 gdp->bg_checksum = save_csum; 2087 2088 crc = csum32 & 0xFFFF; 2089 goto out; 2090 } 2091 2092 /* old crc16 code */ 2093 if (!ext4_has_feature_gdt_csum(sb)) 2094 return 0; 2095 2096 offset = offsetof(struct ext4_group_desc, bg_checksum); 2097 2098 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 2099 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 2100 crc = crc16(crc, (__u8 *)gdp, offset); 2101 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 2102 /* for checksum of struct ext4_group_desc do the rest...*/ 2103 if (ext4_has_feature_64bit(sb) && 2104 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 2105 crc = crc16(crc, (__u8 *)gdp + offset, 2106 le16_to_cpu(sbi->s_es->s_desc_size) - 2107 offset); 2108 2109 out: 2110 return cpu_to_le16(crc); 2111 } 2112 2113 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, 2114 struct ext4_group_desc *gdp) 2115 { 2116 if (ext4_has_group_desc_csum(sb) && 2117 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) 2118 return 0; 2119 2120 return 1; 2121 } 2122 2123 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, 2124 struct ext4_group_desc *gdp) 2125 { 2126 if (!ext4_has_group_desc_csum(sb)) 2127 return; 2128 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); 2129 } 2130 2131 /* Called at mount-time, super-block is locked */ 2132 static int ext4_check_descriptors(struct super_block *sb, 2133 ext4_group_t *first_not_zeroed) 2134 { 2135 struct ext4_sb_info *sbi = EXT4_SB(sb); 2136 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 2137 ext4_fsblk_t last_block; 2138 ext4_fsblk_t block_bitmap; 2139 ext4_fsblk_t inode_bitmap; 2140 ext4_fsblk_t inode_table; 2141 int flexbg_flag = 0; 2142 ext4_group_t i, grp = sbi->s_groups_count; 2143 2144 if (ext4_has_feature_flex_bg(sb)) 2145 flexbg_flag = 1; 2146 2147 ext4_debug("Checking group descriptors"); 2148 2149 for (i = 0; i < sbi->s_groups_count; i++) { 2150 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2151 2152 if (i == sbi->s_groups_count - 1 || flexbg_flag) 2153 last_block = ext4_blocks_count(sbi->s_es) - 1; 2154 else 2155 last_block = first_block + 2156 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2157 2158 if ((grp == sbi->s_groups_count) && 2159 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2160 grp = i; 2161 2162 block_bitmap = ext4_block_bitmap(sb, gdp); 2163 if (block_bitmap < first_block || block_bitmap > last_block) { 2164 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2165 "Block bitmap for group %u not in group " 2166 "(block %llu)!", i, block_bitmap); 2167 return 0; 2168 } 2169 inode_bitmap = ext4_inode_bitmap(sb, gdp); 2170 if (inode_bitmap < first_block || inode_bitmap > last_block) { 2171 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2172 "Inode bitmap for group %u not in group " 2173 "(block %llu)!", i, inode_bitmap); 2174 return 0; 2175 } 2176 inode_table = ext4_inode_table(sb, gdp); 2177 if (inode_table < first_block || 2178 inode_table + sbi->s_itb_per_group - 1 > last_block) { 2179 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2180 "Inode table for group %u not in group " 2181 "(block %llu)!", i, inode_table); 2182 return 0; 2183 } 2184 ext4_lock_group(sb, i); 2185 if (!ext4_group_desc_csum_verify(sb, i, gdp)) { 2186 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2187 "Checksum for group %u failed (%u!=%u)", 2188 i, le16_to_cpu(ext4_group_desc_csum(sb, i, 2189 gdp)), le16_to_cpu(gdp->bg_checksum)); 2190 if (!(sb->s_flags & MS_RDONLY)) { 2191 ext4_unlock_group(sb, i); 2192 return 0; 2193 } 2194 } 2195 ext4_unlock_group(sb, i); 2196 if (!flexbg_flag) 2197 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2198 } 2199 if (NULL != first_not_zeroed) 2200 *first_not_zeroed = grp; 2201 return 1; 2202 } 2203 2204 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2205 * the superblock) which were deleted from all directories, but held open by 2206 * a process at the time of a crash. We walk the list and try to delete these 2207 * inodes at recovery time (only with a read-write filesystem). 2208 * 2209 * In order to keep the orphan inode chain consistent during traversal (in 2210 * case of crash during recovery), we link each inode into the superblock 2211 * orphan list_head and handle it the same way as an inode deletion during 2212 * normal operation (which journals the operations for us). 2213 * 2214 * We only do an iget() and an iput() on each inode, which is very safe if we 2215 * accidentally point at an in-use or already deleted inode. The worst that 2216 * can happen in this case is that we get a "bit already cleared" message from 2217 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2218 * e2fsck was run on this filesystem, and it must have already done the orphan 2219 * inode cleanup for us, so we can safely abort without any further action. 2220 */ 2221 static void ext4_orphan_cleanup(struct super_block *sb, 2222 struct ext4_super_block *es) 2223 { 2224 unsigned int s_flags = sb->s_flags; 2225 int nr_orphans = 0, nr_truncates = 0; 2226 #ifdef CONFIG_QUOTA 2227 int i; 2228 #endif 2229 if (!es->s_last_orphan) { 2230 jbd_debug(4, "no orphan inodes to clean up\n"); 2231 return; 2232 } 2233 2234 if (bdev_read_only(sb->s_bdev)) { 2235 ext4_msg(sb, KERN_ERR, "write access " 2236 "unavailable, skipping orphan cleanup"); 2237 return; 2238 } 2239 2240 /* Check if feature set would not allow a r/w mount */ 2241 if (!ext4_feature_set_ok(sb, 0)) { 2242 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2243 "unknown ROCOMPAT features"); 2244 return; 2245 } 2246 2247 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2248 /* don't clear list on RO mount w/ errors */ 2249 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { 2250 ext4_msg(sb, KERN_INFO, "Errors on filesystem, " 2251 "clearing orphan list.\n"); 2252 es->s_last_orphan = 0; 2253 } 2254 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2255 return; 2256 } 2257 2258 if (s_flags & MS_RDONLY) { 2259 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2260 sb->s_flags &= ~MS_RDONLY; 2261 } 2262 #ifdef CONFIG_QUOTA 2263 /* Needed for iput() to work correctly and not trash data */ 2264 sb->s_flags |= MS_ACTIVE; 2265 /* Turn on quotas so that they are updated correctly */ 2266 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2267 if (EXT4_SB(sb)->s_qf_names[i]) { 2268 int ret = ext4_quota_on_mount(sb, i); 2269 if (ret < 0) 2270 ext4_msg(sb, KERN_ERR, 2271 "Cannot turn on journaled " 2272 "quota: error %d", ret); 2273 } 2274 } 2275 #endif 2276 2277 while (es->s_last_orphan) { 2278 struct inode *inode; 2279 2280 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2281 if (IS_ERR(inode)) { 2282 es->s_last_orphan = 0; 2283 break; 2284 } 2285 2286 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2287 dquot_initialize(inode); 2288 if (inode->i_nlink) { 2289 if (test_opt(sb, DEBUG)) 2290 ext4_msg(sb, KERN_DEBUG, 2291 "%s: truncating inode %lu to %lld bytes", 2292 __func__, inode->i_ino, inode->i_size); 2293 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2294 inode->i_ino, inode->i_size); 2295 inode_lock(inode); 2296 truncate_inode_pages(inode->i_mapping, inode->i_size); 2297 ext4_truncate(inode); 2298 inode_unlock(inode); 2299 nr_truncates++; 2300 } else { 2301 if (test_opt(sb, DEBUG)) 2302 ext4_msg(sb, KERN_DEBUG, 2303 "%s: deleting unreferenced inode %lu", 2304 __func__, inode->i_ino); 2305 jbd_debug(2, "deleting unreferenced inode %lu\n", 2306 inode->i_ino); 2307 nr_orphans++; 2308 } 2309 iput(inode); /* The delete magic happens here! */ 2310 } 2311 2312 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2313 2314 if (nr_orphans) 2315 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2316 PLURAL(nr_orphans)); 2317 if (nr_truncates) 2318 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2319 PLURAL(nr_truncates)); 2320 #ifdef CONFIG_QUOTA 2321 /* Turn quotas off */ 2322 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2323 if (sb_dqopt(sb)->files[i]) 2324 dquot_quota_off(sb, i); 2325 } 2326 #endif 2327 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2328 } 2329 2330 /* 2331 * Maximal extent format file size. 2332 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2333 * extent format containers, within a sector_t, and within i_blocks 2334 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2335 * so that won't be a limiting factor. 2336 * 2337 * However there is other limiting factor. We do store extents in the form 2338 * of starting block and length, hence the resulting length of the extent 2339 * covering maximum file size must fit into on-disk format containers as 2340 * well. Given that length is always by 1 unit bigger than max unit (because 2341 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2342 * 2343 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2344 */ 2345 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2346 { 2347 loff_t res; 2348 loff_t upper_limit = MAX_LFS_FILESIZE; 2349 2350 /* small i_blocks in vfs inode? */ 2351 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2352 /* 2353 * CONFIG_LBDAF is not enabled implies the inode 2354 * i_block represent total blocks in 512 bytes 2355 * 32 == size of vfs inode i_blocks * 8 2356 */ 2357 upper_limit = (1LL << 32) - 1; 2358 2359 /* total blocks in file system block size */ 2360 upper_limit >>= (blkbits - 9); 2361 upper_limit <<= blkbits; 2362 } 2363 2364 /* 2365 * 32-bit extent-start container, ee_block. We lower the maxbytes 2366 * by one fs block, so ee_len can cover the extent of maximum file 2367 * size 2368 */ 2369 res = (1LL << 32) - 1; 2370 res <<= blkbits; 2371 2372 /* Sanity check against vm- & vfs- imposed limits */ 2373 if (res > upper_limit) 2374 res = upper_limit; 2375 2376 return res; 2377 } 2378 2379 /* 2380 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2381 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2382 * We need to be 1 filesystem block less than the 2^48 sector limit. 2383 */ 2384 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2385 { 2386 loff_t res = EXT4_NDIR_BLOCKS; 2387 int meta_blocks; 2388 loff_t upper_limit; 2389 /* This is calculated to be the largest file size for a dense, block 2390 * mapped file such that the file's total number of 512-byte sectors, 2391 * including data and all indirect blocks, does not exceed (2^48 - 1). 2392 * 2393 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2394 * number of 512-byte sectors of the file. 2395 */ 2396 2397 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2398 /* 2399 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2400 * the inode i_block field represents total file blocks in 2401 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2402 */ 2403 upper_limit = (1LL << 32) - 1; 2404 2405 /* total blocks in file system block size */ 2406 upper_limit >>= (bits - 9); 2407 2408 } else { 2409 /* 2410 * We use 48 bit ext4_inode i_blocks 2411 * With EXT4_HUGE_FILE_FL set the i_blocks 2412 * represent total number of blocks in 2413 * file system block size 2414 */ 2415 upper_limit = (1LL << 48) - 1; 2416 2417 } 2418 2419 /* indirect blocks */ 2420 meta_blocks = 1; 2421 /* double indirect blocks */ 2422 meta_blocks += 1 + (1LL << (bits-2)); 2423 /* tripple indirect blocks */ 2424 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2425 2426 upper_limit -= meta_blocks; 2427 upper_limit <<= bits; 2428 2429 res += 1LL << (bits-2); 2430 res += 1LL << (2*(bits-2)); 2431 res += 1LL << (3*(bits-2)); 2432 res <<= bits; 2433 if (res > upper_limit) 2434 res = upper_limit; 2435 2436 if (res > MAX_LFS_FILESIZE) 2437 res = MAX_LFS_FILESIZE; 2438 2439 return res; 2440 } 2441 2442 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2443 ext4_fsblk_t logical_sb_block, int nr) 2444 { 2445 struct ext4_sb_info *sbi = EXT4_SB(sb); 2446 ext4_group_t bg, first_meta_bg; 2447 int has_super = 0; 2448 2449 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2450 2451 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg) 2452 return logical_sb_block + nr + 1; 2453 bg = sbi->s_desc_per_block * nr; 2454 if (ext4_bg_has_super(sb, bg)) 2455 has_super = 1; 2456 2457 /* 2458 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at 2459 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled 2460 * on modern mke2fs or blksize > 1k on older mke2fs) then we must 2461 * compensate. 2462 */ 2463 if (sb->s_blocksize == 1024 && nr == 0 && 2464 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0) 2465 has_super++; 2466 2467 return (has_super + ext4_group_first_block_no(sb, bg)); 2468 } 2469 2470 /** 2471 * ext4_get_stripe_size: Get the stripe size. 2472 * @sbi: In memory super block info 2473 * 2474 * If we have specified it via mount option, then 2475 * use the mount option value. If the value specified at mount time is 2476 * greater than the blocks per group use the super block value. 2477 * If the super block value is greater than blocks per group return 0. 2478 * Allocator needs it be less than blocks per group. 2479 * 2480 */ 2481 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2482 { 2483 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2484 unsigned long stripe_width = 2485 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2486 int ret; 2487 2488 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2489 ret = sbi->s_stripe; 2490 else if (stripe_width <= sbi->s_blocks_per_group) 2491 ret = stripe_width; 2492 else if (stride <= sbi->s_blocks_per_group) 2493 ret = stride; 2494 else 2495 ret = 0; 2496 2497 /* 2498 * If the stripe width is 1, this makes no sense and 2499 * we set it to 0 to turn off stripe handling code. 2500 */ 2501 if (ret <= 1) 2502 ret = 0; 2503 2504 return ret; 2505 } 2506 2507 /* 2508 * Check whether this filesystem can be mounted based on 2509 * the features present and the RDONLY/RDWR mount requested. 2510 * Returns 1 if this filesystem can be mounted as requested, 2511 * 0 if it cannot be. 2512 */ 2513 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2514 { 2515 if (ext4_has_unknown_ext4_incompat_features(sb)) { 2516 ext4_msg(sb, KERN_ERR, 2517 "Couldn't mount because of " 2518 "unsupported optional features (%x)", 2519 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2520 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2521 return 0; 2522 } 2523 2524 if (readonly) 2525 return 1; 2526 2527 if (ext4_has_feature_readonly(sb)) { 2528 ext4_msg(sb, KERN_INFO, "filesystem is read-only"); 2529 sb->s_flags |= MS_RDONLY; 2530 return 1; 2531 } 2532 2533 /* Check that feature set is OK for a read-write mount */ 2534 if (ext4_has_unknown_ext4_ro_compat_features(sb)) { 2535 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2536 "unsupported optional features (%x)", 2537 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2538 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2539 return 0; 2540 } 2541 /* 2542 * Large file size enabled file system can only be mounted 2543 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2544 */ 2545 if (ext4_has_feature_huge_file(sb)) { 2546 if (sizeof(blkcnt_t) < sizeof(u64)) { 2547 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2548 "cannot be mounted RDWR without " 2549 "CONFIG_LBDAF"); 2550 return 0; 2551 } 2552 } 2553 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) { 2554 ext4_msg(sb, KERN_ERR, 2555 "Can't support bigalloc feature without " 2556 "extents feature\n"); 2557 return 0; 2558 } 2559 2560 #ifndef CONFIG_QUOTA 2561 if (ext4_has_feature_quota(sb) && !readonly) { 2562 ext4_msg(sb, KERN_ERR, 2563 "Filesystem with quota feature cannot be mounted RDWR " 2564 "without CONFIG_QUOTA"); 2565 return 0; 2566 } 2567 if (ext4_has_feature_project(sb) && !readonly) { 2568 ext4_msg(sb, KERN_ERR, 2569 "Filesystem with project quota feature cannot be mounted RDWR " 2570 "without CONFIG_QUOTA"); 2571 return 0; 2572 } 2573 #endif /* CONFIG_QUOTA */ 2574 return 1; 2575 } 2576 2577 /* 2578 * This function is called once a day if we have errors logged 2579 * on the file system 2580 */ 2581 static void print_daily_error_info(unsigned long arg) 2582 { 2583 struct super_block *sb = (struct super_block *) arg; 2584 struct ext4_sb_info *sbi; 2585 struct ext4_super_block *es; 2586 2587 sbi = EXT4_SB(sb); 2588 es = sbi->s_es; 2589 2590 if (es->s_error_count) 2591 /* fsck newer than v1.41.13 is needed to clean this condition. */ 2592 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", 2593 le32_to_cpu(es->s_error_count)); 2594 if (es->s_first_error_time) { 2595 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d", 2596 sb->s_id, le32_to_cpu(es->s_first_error_time), 2597 (int) sizeof(es->s_first_error_func), 2598 es->s_first_error_func, 2599 le32_to_cpu(es->s_first_error_line)); 2600 if (es->s_first_error_ino) 2601 printk(": inode %u", 2602 le32_to_cpu(es->s_first_error_ino)); 2603 if (es->s_first_error_block) 2604 printk(": block %llu", (unsigned long long) 2605 le64_to_cpu(es->s_first_error_block)); 2606 printk("\n"); 2607 } 2608 if (es->s_last_error_time) { 2609 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d", 2610 sb->s_id, le32_to_cpu(es->s_last_error_time), 2611 (int) sizeof(es->s_last_error_func), 2612 es->s_last_error_func, 2613 le32_to_cpu(es->s_last_error_line)); 2614 if (es->s_last_error_ino) 2615 printk(": inode %u", 2616 le32_to_cpu(es->s_last_error_ino)); 2617 if (es->s_last_error_block) 2618 printk(": block %llu", (unsigned long long) 2619 le64_to_cpu(es->s_last_error_block)); 2620 printk("\n"); 2621 } 2622 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2623 } 2624 2625 /* Find next suitable group and run ext4_init_inode_table */ 2626 static int ext4_run_li_request(struct ext4_li_request *elr) 2627 { 2628 struct ext4_group_desc *gdp = NULL; 2629 ext4_group_t group, ngroups; 2630 struct super_block *sb; 2631 unsigned long timeout = 0; 2632 int ret = 0; 2633 2634 sb = elr->lr_super; 2635 ngroups = EXT4_SB(sb)->s_groups_count; 2636 2637 sb_start_write(sb); 2638 for (group = elr->lr_next_group; group < ngroups; group++) { 2639 gdp = ext4_get_group_desc(sb, group, NULL); 2640 if (!gdp) { 2641 ret = 1; 2642 break; 2643 } 2644 2645 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2646 break; 2647 } 2648 2649 if (group >= ngroups) 2650 ret = 1; 2651 2652 if (!ret) { 2653 timeout = jiffies; 2654 ret = ext4_init_inode_table(sb, group, 2655 elr->lr_timeout ? 0 : 1); 2656 if (elr->lr_timeout == 0) { 2657 timeout = (jiffies - timeout) * 2658 elr->lr_sbi->s_li_wait_mult; 2659 elr->lr_timeout = timeout; 2660 } 2661 elr->lr_next_sched = jiffies + elr->lr_timeout; 2662 elr->lr_next_group = group + 1; 2663 } 2664 sb_end_write(sb); 2665 2666 return ret; 2667 } 2668 2669 /* 2670 * Remove lr_request from the list_request and free the 2671 * request structure. Should be called with li_list_mtx held 2672 */ 2673 static void ext4_remove_li_request(struct ext4_li_request *elr) 2674 { 2675 struct ext4_sb_info *sbi; 2676 2677 if (!elr) 2678 return; 2679 2680 sbi = elr->lr_sbi; 2681 2682 list_del(&elr->lr_request); 2683 sbi->s_li_request = NULL; 2684 kfree(elr); 2685 } 2686 2687 static void ext4_unregister_li_request(struct super_block *sb) 2688 { 2689 mutex_lock(&ext4_li_mtx); 2690 if (!ext4_li_info) { 2691 mutex_unlock(&ext4_li_mtx); 2692 return; 2693 } 2694 2695 mutex_lock(&ext4_li_info->li_list_mtx); 2696 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2697 mutex_unlock(&ext4_li_info->li_list_mtx); 2698 mutex_unlock(&ext4_li_mtx); 2699 } 2700 2701 static struct task_struct *ext4_lazyinit_task; 2702 2703 /* 2704 * This is the function where ext4lazyinit thread lives. It walks 2705 * through the request list searching for next scheduled filesystem. 2706 * When such a fs is found, run the lazy initialization request 2707 * (ext4_rn_li_request) and keep track of the time spend in this 2708 * function. Based on that time we compute next schedule time of 2709 * the request. When walking through the list is complete, compute 2710 * next waking time and put itself into sleep. 2711 */ 2712 static int ext4_lazyinit_thread(void *arg) 2713 { 2714 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2715 struct list_head *pos, *n; 2716 struct ext4_li_request *elr; 2717 unsigned long next_wakeup, cur; 2718 2719 BUG_ON(NULL == eli); 2720 2721 cont_thread: 2722 while (true) { 2723 next_wakeup = MAX_JIFFY_OFFSET; 2724 2725 mutex_lock(&eli->li_list_mtx); 2726 if (list_empty(&eli->li_request_list)) { 2727 mutex_unlock(&eli->li_list_mtx); 2728 goto exit_thread; 2729 } 2730 2731 list_for_each_safe(pos, n, &eli->li_request_list) { 2732 elr = list_entry(pos, struct ext4_li_request, 2733 lr_request); 2734 2735 if (time_after_eq(jiffies, elr->lr_next_sched)) { 2736 if (ext4_run_li_request(elr) != 0) { 2737 /* error, remove the lazy_init job */ 2738 ext4_remove_li_request(elr); 2739 continue; 2740 } 2741 } 2742 2743 if (time_before(elr->lr_next_sched, next_wakeup)) 2744 next_wakeup = elr->lr_next_sched; 2745 } 2746 mutex_unlock(&eli->li_list_mtx); 2747 2748 try_to_freeze(); 2749 2750 cur = jiffies; 2751 if ((time_after_eq(cur, next_wakeup)) || 2752 (MAX_JIFFY_OFFSET == next_wakeup)) { 2753 cond_resched(); 2754 continue; 2755 } 2756 2757 schedule_timeout_interruptible(next_wakeup - cur); 2758 2759 if (kthread_should_stop()) { 2760 ext4_clear_request_list(); 2761 goto exit_thread; 2762 } 2763 } 2764 2765 exit_thread: 2766 /* 2767 * It looks like the request list is empty, but we need 2768 * to check it under the li_list_mtx lock, to prevent any 2769 * additions into it, and of course we should lock ext4_li_mtx 2770 * to atomically free the list and ext4_li_info, because at 2771 * this point another ext4 filesystem could be registering 2772 * new one. 2773 */ 2774 mutex_lock(&ext4_li_mtx); 2775 mutex_lock(&eli->li_list_mtx); 2776 if (!list_empty(&eli->li_request_list)) { 2777 mutex_unlock(&eli->li_list_mtx); 2778 mutex_unlock(&ext4_li_mtx); 2779 goto cont_thread; 2780 } 2781 mutex_unlock(&eli->li_list_mtx); 2782 kfree(ext4_li_info); 2783 ext4_li_info = NULL; 2784 mutex_unlock(&ext4_li_mtx); 2785 2786 return 0; 2787 } 2788 2789 static void ext4_clear_request_list(void) 2790 { 2791 struct list_head *pos, *n; 2792 struct ext4_li_request *elr; 2793 2794 mutex_lock(&ext4_li_info->li_list_mtx); 2795 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 2796 elr = list_entry(pos, struct ext4_li_request, 2797 lr_request); 2798 ext4_remove_li_request(elr); 2799 } 2800 mutex_unlock(&ext4_li_info->li_list_mtx); 2801 } 2802 2803 static int ext4_run_lazyinit_thread(void) 2804 { 2805 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 2806 ext4_li_info, "ext4lazyinit"); 2807 if (IS_ERR(ext4_lazyinit_task)) { 2808 int err = PTR_ERR(ext4_lazyinit_task); 2809 ext4_clear_request_list(); 2810 kfree(ext4_li_info); 2811 ext4_li_info = NULL; 2812 printk(KERN_CRIT "EXT4-fs: error %d creating inode table " 2813 "initialization thread\n", 2814 err); 2815 return err; 2816 } 2817 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 2818 return 0; 2819 } 2820 2821 /* 2822 * Check whether it make sense to run itable init. thread or not. 2823 * If there is at least one uninitialized inode table, return 2824 * corresponding group number, else the loop goes through all 2825 * groups and return total number of groups. 2826 */ 2827 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 2828 { 2829 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 2830 struct ext4_group_desc *gdp = NULL; 2831 2832 for (group = 0; group < ngroups; group++) { 2833 gdp = ext4_get_group_desc(sb, group, NULL); 2834 if (!gdp) 2835 continue; 2836 2837 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2838 break; 2839 } 2840 2841 return group; 2842 } 2843 2844 static int ext4_li_info_new(void) 2845 { 2846 struct ext4_lazy_init *eli = NULL; 2847 2848 eli = kzalloc(sizeof(*eli), GFP_KERNEL); 2849 if (!eli) 2850 return -ENOMEM; 2851 2852 INIT_LIST_HEAD(&eli->li_request_list); 2853 mutex_init(&eli->li_list_mtx); 2854 2855 eli->li_state |= EXT4_LAZYINIT_QUIT; 2856 2857 ext4_li_info = eli; 2858 2859 return 0; 2860 } 2861 2862 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 2863 ext4_group_t start) 2864 { 2865 struct ext4_sb_info *sbi = EXT4_SB(sb); 2866 struct ext4_li_request *elr; 2867 2868 elr = kzalloc(sizeof(*elr), GFP_KERNEL); 2869 if (!elr) 2870 return NULL; 2871 2872 elr->lr_super = sb; 2873 elr->lr_sbi = sbi; 2874 elr->lr_next_group = start; 2875 2876 /* 2877 * Randomize first schedule time of the request to 2878 * spread the inode table initialization requests 2879 * better. 2880 */ 2881 elr->lr_next_sched = jiffies + (prandom_u32() % 2882 (EXT4_DEF_LI_MAX_START_DELAY * HZ)); 2883 return elr; 2884 } 2885 2886 int ext4_register_li_request(struct super_block *sb, 2887 ext4_group_t first_not_zeroed) 2888 { 2889 struct ext4_sb_info *sbi = EXT4_SB(sb); 2890 struct ext4_li_request *elr = NULL; 2891 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2892 int ret = 0; 2893 2894 mutex_lock(&ext4_li_mtx); 2895 if (sbi->s_li_request != NULL) { 2896 /* 2897 * Reset timeout so it can be computed again, because 2898 * s_li_wait_mult might have changed. 2899 */ 2900 sbi->s_li_request->lr_timeout = 0; 2901 goto out; 2902 } 2903 2904 if (first_not_zeroed == ngroups || 2905 (sb->s_flags & MS_RDONLY) || 2906 !test_opt(sb, INIT_INODE_TABLE)) 2907 goto out; 2908 2909 elr = ext4_li_request_new(sb, first_not_zeroed); 2910 if (!elr) { 2911 ret = -ENOMEM; 2912 goto out; 2913 } 2914 2915 if (NULL == ext4_li_info) { 2916 ret = ext4_li_info_new(); 2917 if (ret) 2918 goto out; 2919 } 2920 2921 mutex_lock(&ext4_li_info->li_list_mtx); 2922 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 2923 mutex_unlock(&ext4_li_info->li_list_mtx); 2924 2925 sbi->s_li_request = elr; 2926 /* 2927 * set elr to NULL here since it has been inserted to 2928 * the request_list and the removal and free of it is 2929 * handled by ext4_clear_request_list from now on. 2930 */ 2931 elr = NULL; 2932 2933 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 2934 ret = ext4_run_lazyinit_thread(); 2935 if (ret) 2936 goto out; 2937 } 2938 out: 2939 mutex_unlock(&ext4_li_mtx); 2940 if (ret) 2941 kfree(elr); 2942 return ret; 2943 } 2944 2945 /* 2946 * We do not need to lock anything since this is called on 2947 * module unload. 2948 */ 2949 static void ext4_destroy_lazyinit_thread(void) 2950 { 2951 /* 2952 * If thread exited earlier 2953 * there's nothing to be done. 2954 */ 2955 if (!ext4_li_info || !ext4_lazyinit_task) 2956 return; 2957 2958 kthread_stop(ext4_lazyinit_task); 2959 } 2960 2961 static int set_journal_csum_feature_set(struct super_block *sb) 2962 { 2963 int ret = 1; 2964 int compat, incompat; 2965 struct ext4_sb_info *sbi = EXT4_SB(sb); 2966 2967 if (ext4_has_metadata_csum(sb)) { 2968 /* journal checksum v3 */ 2969 compat = 0; 2970 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; 2971 } else { 2972 /* journal checksum v1 */ 2973 compat = JBD2_FEATURE_COMPAT_CHECKSUM; 2974 incompat = 0; 2975 } 2976 2977 jbd2_journal_clear_features(sbi->s_journal, 2978 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2979 JBD2_FEATURE_INCOMPAT_CSUM_V3 | 2980 JBD2_FEATURE_INCOMPAT_CSUM_V2); 2981 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2982 ret = jbd2_journal_set_features(sbi->s_journal, 2983 compat, 0, 2984 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 2985 incompat); 2986 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2987 ret = jbd2_journal_set_features(sbi->s_journal, 2988 compat, 0, 2989 incompat); 2990 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2991 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2992 } else { 2993 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2994 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2995 } 2996 2997 return ret; 2998 } 2999 3000 /* 3001 * Note: calculating the overhead so we can be compatible with 3002 * historical BSD practice is quite difficult in the face of 3003 * clusters/bigalloc. This is because multiple metadata blocks from 3004 * different block group can end up in the same allocation cluster. 3005 * Calculating the exact overhead in the face of clustered allocation 3006 * requires either O(all block bitmaps) in memory or O(number of block 3007 * groups**2) in time. We will still calculate the superblock for 3008 * older file systems --- and if we come across with a bigalloc file 3009 * system with zero in s_overhead_clusters the estimate will be close to 3010 * correct especially for very large cluster sizes --- but for newer 3011 * file systems, it's better to calculate this figure once at mkfs 3012 * time, and store it in the superblock. If the superblock value is 3013 * present (even for non-bigalloc file systems), we will use it. 3014 */ 3015 static int count_overhead(struct super_block *sb, ext4_group_t grp, 3016 char *buf) 3017 { 3018 struct ext4_sb_info *sbi = EXT4_SB(sb); 3019 struct ext4_group_desc *gdp; 3020 ext4_fsblk_t first_block, last_block, b; 3021 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3022 int s, j, count = 0; 3023 3024 if (!ext4_has_feature_bigalloc(sb)) 3025 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + 3026 sbi->s_itb_per_group + 2); 3027 3028 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + 3029 (grp * EXT4_BLOCKS_PER_GROUP(sb)); 3030 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; 3031 for (i = 0; i < ngroups; i++) { 3032 gdp = ext4_get_group_desc(sb, i, NULL); 3033 b = ext4_block_bitmap(sb, gdp); 3034 if (b >= first_block && b <= last_block) { 3035 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3036 count++; 3037 } 3038 b = ext4_inode_bitmap(sb, gdp); 3039 if (b >= first_block && b <= last_block) { 3040 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3041 count++; 3042 } 3043 b = ext4_inode_table(sb, gdp); 3044 if (b >= first_block && b + sbi->s_itb_per_group <= last_block) 3045 for (j = 0; j < sbi->s_itb_per_group; j++, b++) { 3046 int c = EXT4_B2C(sbi, b - first_block); 3047 ext4_set_bit(c, buf); 3048 count++; 3049 } 3050 if (i != grp) 3051 continue; 3052 s = 0; 3053 if (ext4_bg_has_super(sb, grp)) { 3054 ext4_set_bit(s++, buf); 3055 count++; 3056 } 3057 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { 3058 ext4_set_bit(EXT4_B2C(sbi, s++), buf); 3059 count++; 3060 } 3061 } 3062 if (!count) 3063 return 0; 3064 return EXT4_CLUSTERS_PER_GROUP(sb) - 3065 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); 3066 } 3067 3068 /* 3069 * Compute the overhead and stash it in sbi->s_overhead 3070 */ 3071 int ext4_calculate_overhead(struct super_block *sb) 3072 { 3073 struct ext4_sb_info *sbi = EXT4_SB(sb); 3074 struct ext4_super_block *es = sbi->s_es; 3075 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3076 ext4_fsblk_t overhead = 0; 3077 char *buf = (char *) get_zeroed_page(GFP_NOFS); 3078 3079 if (!buf) 3080 return -ENOMEM; 3081 3082 /* 3083 * Compute the overhead (FS structures). This is constant 3084 * for a given filesystem unless the number of block groups 3085 * changes so we cache the previous value until it does. 3086 */ 3087 3088 /* 3089 * All of the blocks before first_data_block are overhead 3090 */ 3091 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 3092 3093 /* 3094 * Add the overhead found in each block group 3095 */ 3096 for (i = 0; i < ngroups; i++) { 3097 int blks; 3098 3099 blks = count_overhead(sb, i, buf); 3100 overhead += blks; 3101 if (blks) 3102 memset(buf, 0, PAGE_SIZE); 3103 cond_resched(); 3104 } 3105 /* Add the internal journal blocks as well */ 3106 if (sbi->s_journal && !sbi->journal_bdev) 3107 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); 3108 3109 sbi->s_overhead = overhead; 3110 smp_wmb(); 3111 free_page((unsigned long) buf); 3112 return 0; 3113 } 3114 3115 static void ext4_set_resv_clusters(struct super_block *sb) 3116 { 3117 ext4_fsblk_t resv_clusters; 3118 struct ext4_sb_info *sbi = EXT4_SB(sb); 3119 3120 /* 3121 * There's no need to reserve anything when we aren't using extents. 3122 * The space estimates are exact, there are no unwritten extents, 3123 * hole punching doesn't need new metadata... This is needed especially 3124 * to keep ext2/3 backward compatibility. 3125 */ 3126 if (!ext4_has_feature_extents(sb)) 3127 return; 3128 /* 3129 * By default we reserve 2% or 4096 clusters, whichever is smaller. 3130 * This should cover the situations where we can not afford to run 3131 * out of space like for example punch hole, or converting 3132 * unwritten extents in delalloc path. In most cases such 3133 * allocation would require 1, or 2 blocks, higher numbers are 3134 * very rare. 3135 */ 3136 resv_clusters = (ext4_blocks_count(sbi->s_es) >> 3137 sbi->s_cluster_bits); 3138 3139 do_div(resv_clusters, 50); 3140 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); 3141 3142 atomic64_set(&sbi->s_resv_clusters, resv_clusters); 3143 } 3144 3145 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3146 { 3147 char *orig_data = kstrdup(data, GFP_KERNEL); 3148 struct buffer_head *bh; 3149 struct ext4_super_block *es = NULL; 3150 struct ext4_sb_info *sbi; 3151 ext4_fsblk_t block; 3152 ext4_fsblk_t sb_block = get_sb_block(&data); 3153 ext4_fsblk_t logical_sb_block; 3154 unsigned long offset = 0; 3155 unsigned long journal_devnum = 0; 3156 unsigned long def_mount_opts; 3157 struct inode *root; 3158 const char *descr; 3159 int ret = -ENOMEM; 3160 int blocksize, clustersize; 3161 unsigned int db_count; 3162 unsigned int i; 3163 int needs_recovery, has_huge_files, has_bigalloc; 3164 __u64 blocks_count; 3165 int err = 0; 3166 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3167 ext4_group_t first_not_zeroed; 3168 3169 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3170 if (!sbi) 3171 goto out_free_orig; 3172 3173 sbi->s_blockgroup_lock = 3174 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3175 if (!sbi->s_blockgroup_lock) { 3176 kfree(sbi); 3177 goto out_free_orig; 3178 } 3179 sb->s_fs_info = sbi; 3180 sbi->s_sb = sb; 3181 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3182 sbi->s_sb_block = sb_block; 3183 if (sb->s_bdev->bd_part) 3184 sbi->s_sectors_written_start = 3185 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3186 3187 /* Cleanup superblock name */ 3188 strreplace(sb->s_id, '/', '!'); 3189 3190 /* -EINVAL is default */ 3191 ret = -EINVAL; 3192 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3193 if (!blocksize) { 3194 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3195 goto out_fail; 3196 } 3197 3198 /* 3199 * The ext4 superblock will not be buffer aligned for other than 1kB 3200 * block sizes. We need to calculate the offset from buffer start. 3201 */ 3202 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 3203 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3204 offset = do_div(logical_sb_block, blocksize); 3205 } else { 3206 logical_sb_block = sb_block; 3207 } 3208 3209 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) { 3210 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3211 goto out_fail; 3212 } 3213 /* 3214 * Note: s_es must be initialized as soon as possible because 3215 * some ext4 macro-instructions depend on its value 3216 */ 3217 es = (struct ext4_super_block *) (bh->b_data + offset); 3218 sbi->s_es = es; 3219 sb->s_magic = le16_to_cpu(es->s_magic); 3220 if (sb->s_magic != EXT4_SUPER_MAGIC) 3221 goto cantfind_ext4; 3222 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3223 3224 /* Warn if metadata_csum and gdt_csum are both set. */ 3225 if (ext4_has_feature_metadata_csum(sb) && 3226 ext4_has_feature_gdt_csum(sb)) 3227 ext4_warning(sb, "metadata_csum and uninit_bg are " 3228 "redundant flags; please run fsck."); 3229 3230 /* Check for a known checksum algorithm */ 3231 if (!ext4_verify_csum_type(sb, es)) { 3232 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3233 "unknown checksum algorithm."); 3234 silent = 1; 3235 goto cantfind_ext4; 3236 } 3237 3238 /* Load the checksum driver */ 3239 if (ext4_has_feature_metadata_csum(sb)) { 3240 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 3241 if (IS_ERR(sbi->s_chksum_driver)) { 3242 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); 3243 ret = PTR_ERR(sbi->s_chksum_driver); 3244 sbi->s_chksum_driver = NULL; 3245 goto failed_mount; 3246 } 3247 } 3248 3249 /* Check superblock checksum */ 3250 if (!ext4_superblock_csum_verify(sb, es)) { 3251 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3252 "invalid superblock checksum. Run e2fsck?"); 3253 silent = 1; 3254 ret = -EFSBADCRC; 3255 goto cantfind_ext4; 3256 } 3257 3258 /* Precompute checksum seed for all metadata */ 3259 if (ext4_has_feature_csum_seed(sb)) 3260 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed); 3261 else if (ext4_has_metadata_csum(sb)) 3262 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, 3263 sizeof(es->s_uuid)); 3264 3265 /* Set defaults before we parse the mount options */ 3266 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3267 set_opt(sb, INIT_INODE_TABLE); 3268 if (def_mount_opts & EXT4_DEFM_DEBUG) 3269 set_opt(sb, DEBUG); 3270 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 3271 set_opt(sb, GRPID); 3272 if (def_mount_opts & EXT4_DEFM_UID16) 3273 set_opt(sb, NO_UID32); 3274 /* xattr user namespace & acls are now defaulted on */ 3275 set_opt(sb, XATTR_USER); 3276 #ifdef CONFIG_EXT4_FS_POSIX_ACL 3277 set_opt(sb, POSIX_ACL); 3278 #endif 3279 /* don't forget to enable journal_csum when metadata_csum is enabled. */ 3280 if (ext4_has_metadata_csum(sb)) 3281 set_opt(sb, JOURNAL_CHECKSUM); 3282 3283 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3284 set_opt(sb, JOURNAL_DATA); 3285 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3286 set_opt(sb, ORDERED_DATA); 3287 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3288 set_opt(sb, WRITEBACK_DATA); 3289 3290 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3291 set_opt(sb, ERRORS_PANIC); 3292 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3293 set_opt(sb, ERRORS_CONT); 3294 else 3295 set_opt(sb, ERRORS_RO); 3296 /* block_validity enabled by default; disable with noblock_validity */ 3297 set_opt(sb, BLOCK_VALIDITY); 3298 if (def_mount_opts & EXT4_DEFM_DISCARD) 3299 set_opt(sb, DISCARD); 3300 3301 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 3302 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 3303 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 3304 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 3305 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3306 3307 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3308 set_opt(sb, BARRIER); 3309 3310 /* 3311 * enable delayed allocation by default 3312 * Use -o nodelalloc to turn it off 3313 */ 3314 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && 3315 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3316 set_opt(sb, DELALLOC); 3317 3318 /* 3319 * set default s_li_wait_mult for lazyinit, for the case there is 3320 * no mount option specified. 3321 */ 3322 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 3323 3324 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 3325 &journal_devnum, &journal_ioprio, 0)) { 3326 ext4_msg(sb, KERN_WARNING, 3327 "failed to parse options in superblock: %s", 3328 sbi->s_es->s_mount_opts); 3329 } 3330 sbi->s_def_mount_opt = sbi->s_mount_opt; 3331 if (!parse_options((char *) data, sb, &journal_devnum, 3332 &journal_ioprio, 0)) 3333 goto failed_mount; 3334 3335 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3336 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " 3337 "with data=journal disables delayed " 3338 "allocation and O_DIRECT support!\n"); 3339 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 3340 ext4_msg(sb, KERN_ERR, "can't mount with " 3341 "both data=journal and delalloc"); 3342 goto failed_mount; 3343 } 3344 if (test_opt(sb, DIOREAD_NOLOCK)) { 3345 ext4_msg(sb, KERN_ERR, "can't mount with " 3346 "both data=journal and dioread_nolock"); 3347 goto failed_mount; 3348 } 3349 if (test_opt(sb, DAX)) { 3350 ext4_msg(sb, KERN_ERR, "can't mount with " 3351 "both data=journal and dax"); 3352 goto failed_mount; 3353 } 3354 if (test_opt(sb, DELALLOC)) 3355 clear_opt(sb, DELALLOC); 3356 } else { 3357 sb->s_iflags |= SB_I_CGROUPWB; 3358 } 3359 3360 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3361 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3362 3363 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3364 (ext4_has_compat_features(sb) || 3365 ext4_has_ro_compat_features(sb) || 3366 ext4_has_incompat_features(sb))) 3367 ext4_msg(sb, KERN_WARNING, 3368 "feature flags set on rev 0 fs, " 3369 "running e2fsck is recommended"); 3370 3371 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { 3372 set_opt2(sb, HURD_COMPAT); 3373 if (ext4_has_feature_64bit(sb)) { 3374 ext4_msg(sb, KERN_ERR, 3375 "The Hurd can't support 64-bit file systems"); 3376 goto failed_mount; 3377 } 3378 } 3379 3380 if (IS_EXT2_SB(sb)) { 3381 if (ext2_feature_set_ok(sb)) 3382 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 3383 "using the ext4 subsystem"); 3384 else { 3385 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 3386 "to feature incompatibilities"); 3387 goto failed_mount; 3388 } 3389 } 3390 3391 if (IS_EXT3_SB(sb)) { 3392 if (ext3_feature_set_ok(sb)) 3393 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 3394 "using the ext4 subsystem"); 3395 else { 3396 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 3397 "to feature incompatibilities"); 3398 goto failed_mount; 3399 } 3400 } 3401 3402 /* 3403 * Check feature flags regardless of the revision level, since we 3404 * previously didn't change the revision level when setting the flags, 3405 * so there is a chance incompat flags are set on a rev 0 filesystem. 3406 */ 3407 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3408 goto failed_mount; 3409 3410 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 3411 if (blocksize < EXT4_MIN_BLOCK_SIZE || 3412 blocksize > EXT4_MAX_BLOCK_SIZE) { 3413 ext4_msg(sb, KERN_ERR, 3414 "Unsupported filesystem blocksize %d", blocksize); 3415 goto failed_mount; 3416 } 3417 3418 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { 3419 if (blocksize != PAGE_SIZE) { 3420 ext4_msg(sb, KERN_ERR, 3421 "error: unsupported blocksize for dax"); 3422 goto failed_mount; 3423 } 3424 if (!sb->s_bdev->bd_disk->fops->direct_access) { 3425 ext4_msg(sb, KERN_ERR, 3426 "error: device does not support dax"); 3427 goto failed_mount; 3428 } 3429 } 3430 3431 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { 3432 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", 3433 es->s_encryption_level); 3434 goto failed_mount; 3435 } 3436 3437 if (sb->s_blocksize != blocksize) { 3438 /* Validate the filesystem blocksize */ 3439 if (!sb_set_blocksize(sb, blocksize)) { 3440 ext4_msg(sb, KERN_ERR, "bad block size %d", 3441 blocksize); 3442 goto failed_mount; 3443 } 3444 3445 brelse(bh); 3446 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3447 offset = do_div(logical_sb_block, blocksize); 3448 bh = sb_bread_unmovable(sb, logical_sb_block); 3449 if (!bh) { 3450 ext4_msg(sb, KERN_ERR, 3451 "Can't read superblock on 2nd try"); 3452 goto failed_mount; 3453 } 3454 es = (struct ext4_super_block *)(bh->b_data + offset); 3455 sbi->s_es = es; 3456 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3457 ext4_msg(sb, KERN_ERR, 3458 "Magic mismatch, very weird!"); 3459 goto failed_mount; 3460 } 3461 } 3462 3463 has_huge_files = ext4_has_feature_huge_file(sb); 3464 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3465 has_huge_files); 3466 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3467 3468 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3469 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3470 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3471 } else { 3472 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3473 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3474 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 3475 (!is_power_of_2(sbi->s_inode_size)) || 3476 (sbi->s_inode_size > blocksize)) { 3477 ext4_msg(sb, KERN_ERR, 3478 "unsupported inode size: %d", 3479 sbi->s_inode_size); 3480 goto failed_mount; 3481 } 3482 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3483 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3484 } 3485 3486 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 3487 if (ext4_has_feature_64bit(sb)) { 3488 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 3489 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3490 !is_power_of_2(sbi->s_desc_size)) { 3491 ext4_msg(sb, KERN_ERR, 3492 "unsupported descriptor size %lu", 3493 sbi->s_desc_size); 3494 goto failed_mount; 3495 } 3496 } else 3497 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 3498 3499 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3500 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3501 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 3502 goto cantfind_ext4; 3503 3504 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3505 if (sbi->s_inodes_per_block == 0) 3506 goto cantfind_ext4; 3507 sbi->s_itb_per_group = sbi->s_inodes_per_group / 3508 sbi->s_inodes_per_block; 3509 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3510 sbi->s_sbh = bh; 3511 sbi->s_mount_state = le16_to_cpu(es->s_state); 3512 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3513 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 3514 3515 for (i = 0; i < 4; i++) 3516 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3517 sbi->s_def_hash_version = es->s_def_hash_version; 3518 if (ext4_has_feature_dir_index(sb)) { 3519 i = le32_to_cpu(es->s_flags); 3520 if (i & EXT2_FLAGS_UNSIGNED_HASH) 3521 sbi->s_hash_unsigned = 3; 3522 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3523 #ifdef __CHAR_UNSIGNED__ 3524 if (!(sb->s_flags & MS_RDONLY)) 3525 es->s_flags |= 3526 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3527 sbi->s_hash_unsigned = 3; 3528 #else 3529 if (!(sb->s_flags & MS_RDONLY)) 3530 es->s_flags |= 3531 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3532 #endif 3533 } 3534 } 3535 3536 /* Handle clustersize */ 3537 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 3538 has_bigalloc = ext4_has_feature_bigalloc(sb); 3539 if (has_bigalloc) { 3540 if (clustersize < blocksize) { 3541 ext4_msg(sb, KERN_ERR, 3542 "cluster size (%d) smaller than " 3543 "block size (%d)", clustersize, blocksize); 3544 goto failed_mount; 3545 } 3546 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 3547 le32_to_cpu(es->s_log_block_size); 3548 sbi->s_clusters_per_group = 3549 le32_to_cpu(es->s_clusters_per_group); 3550 if (sbi->s_clusters_per_group > blocksize * 8) { 3551 ext4_msg(sb, KERN_ERR, 3552 "#clusters per group too big: %lu", 3553 sbi->s_clusters_per_group); 3554 goto failed_mount; 3555 } 3556 if (sbi->s_blocks_per_group != 3557 (sbi->s_clusters_per_group * (clustersize / blocksize))) { 3558 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " 3559 "clusters per group (%lu) inconsistent", 3560 sbi->s_blocks_per_group, 3561 sbi->s_clusters_per_group); 3562 goto failed_mount; 3563 } 3564 } else { 3565 if (clustersize != blocksize) { 3566 ext4_warning(sb, "fragment/cluster size (%d) != " 3567 "block size (%d)", clustersize, 3568 blocksize); 3569 clustersize = blocksize; 3570 } 3571 if (sbi->s_blocks_per_group > blocksize * 8) { 3572 ext4_msg(sb, KERN_ERR, 3573 "#blocks per group too big: %lu", 3574 sbi->s_blocks_per_group); 3575 goto failed_mount; 3576 } 3577 sbi->s_clusters_per_group = sbi->s_blocks_per_group; 3578 sbi->s_cluster_bits = 0; 3579 } 3580 sbi->s_cluster_ratio = clustersize / blocksize; 3581 3582 if (sbi->s_inodes_per_group > blocksize * 8) { 3583 ext4_msg(sb, KERN_ERR, 3584 "#inodes per group too big: %lu", 3585 sbi->s_inodes_per_group); 3586 goto failed_mount; 3587 } 3588 3589 /* Do we have standard group size of clustersize * 8 blocks ? */ 3590 if (sbi->s_blocks_per_group == clustersize << 3) 3591 set_opt2(sb, STD_GROUP_SIZE); 3592 3593 /* 3594 * Test whether we have more sectors than will fit in sector_t, 3595 * and whether the max offset is addressable by the page cache. 3596 */ 3597 err = generic_check_addressable(sb->s_blocksize_bits, 3598 ext4_blocks_count(es)); 3599 if (err) { 3600 ext4_msg(sb, KERN_ERR, "filesystem" 3601 " too large to mount safely on this system"); 3602 if (sizeof(sector_t) < 8) 3603 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 3604 goto failed_mount; 3605 } 3606 3607 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3608 goto cantfind_ext4; 3609 3610 /* check blocks count against device size */ 3611 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 3612 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3613 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3614 "exceeds size of device (%llu blocks)", 3615 ext4_blocks_count(es), blocks_count); 3616 goto failed_mount; 3617 } 3618 3619 /* 3620 * It makes no sense for the first data block to be beyond the end 3621 * of the filesystem. 3622 */ 3623 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3624 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 3625 "block %u is beyond end of filesystem (%llu)", 3626 le32_to_cpu(es->s_first_data_block), 3627 ext4_blocks_count(es)); 3628 goto failed_mount; 3629 } 3630 blocks_count = (ext4_blocks_count(es) - 3631 le32_to_cpu(es->s_first_data_block) + 3632 EXT4_BLOCKS_PER_GROUP(sb) - 1); 3633 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 3634 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3635 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 3636 "(block count %llu, first data block %u, " 3637 "blocks per group %lu)", sbi->s_groups_count, 3638 ext4_blocks_count(es), 3639 le32_to_cpu(es->s_first_data_block), 3640 EXT4_BLOCKS_PER_GROUP(sb)); 3641 goto failed_mount; 3642 } 3643 sbi->s_groups_count = blocks_count; 3644 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3645 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3646 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3647 EXT4_DESC_PER_BLOCK(sb); 3648 sbi->s_group_desc = ext4_kvmalloc(db_count * 3649 sizeof(struct buffer_head *), 3650 GFP_KERNEL); 3651 if (sbi->s_group_desc == NULL) { 3652 ext4_msg(sb, KERN_ERR, "not enough memory"); 3653 ret = -ENOMEM; 3654 goto failed_mount; 3655 } 3656 3657 bgl_lock_init(sbi->s_blockgroup_lock); 3658 3659 for (i = 0; i < db_count; i++) { 3660 block = descriptor_loc(sb, logical_sb_block, i); 3661 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block); 3662 if (!sbi->s_group_desc[i]) { 3663 ext4_msg(sb, KERN_ERR, 3664 "can't read group descriptor %d", i); 3665 db_count = i; 3666 goto failed_mount2; 3667 } 3668 } 3669 if (!ext4_check_descriptors(sb, &first_not_zeroed)) { 3670 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3671 ret = -EFSCORRUPTED; 3672 goto failed_mount2; 3673 } 3674 3675 sbi->s_gdb_count = db_count; 3676 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3677 spin_lock_init(&sbi->s_next_gen_lock); 3678 3679 setup_timer(&sbi->s_err_report, print_daily_error_info, 3680 (unsigned long) sb); 3681 3682 /* Register extent status tree shrinker */ 3683 if (ext4_es_register_shrinker(sbi)) 3684 goto failed_mount3; 3685 3686 sbi->s_stripe = ext4_get_stripe_size(sbi); 3687 sbi->s_extent_max_zeroout_kb = 32; 3688 3689 /* 3690 * set up enough so that it can read an inode 3691 */ 3692 sb->s_op = &ext4_sops; 3693 sb->s_export_op = &ext4_export_ops; 3694 sb->s_xattr = ext4_xattr_handlers; 3695 #ifdef CONFIG_QUOTA 3696 sb->dq_op = &ext4_quota_operations; 3697 if (ext4_has_feature_quota(sb)) 3698 sb->s_qcop = &dquot_quotactl_sysfile_ops; 3699 else 3700 sb->s_qcop = &ext4_qctl_operations; 3701 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; 3702 #endif 3703 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3704 3705 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 3706 mutex_init(&sbi->s_orphan_lock); 3707 3708 sb->s_root = NULL; 3709 3710 needs_recovery = (es->s_last_orphan != 0 || 3711 ext4_has_feature_journal_needs_recovery(sb)); 3712 3713 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY)) 3714 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 3715 goto failed_mount3a; 3716 3717 /* 3718 * The first inode we look at is the journal inode. Don't try 3719 * root first: it may be modified in the journal! 3720 */ 3721 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { 3722 if (ext4_load_journal(sb, es, journal_devnum)) 3723 goto failed_mount3a; 3724 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 3725 ext4_has_feature_journal_needs_recovery(sb)) { 3726 ext4_msg(sb, KERN_ERR, "required journal recovery " 3727 "suppressed and not mounted read-only"); 3728 goto failed_mount_wq; 3729 } else { 3730 /* Nojournal mode, all journal mount options are illegal */ 3731 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) { 3732 ext4_msg(sb, KERN_ERR, "can't mount with " 3733 "journal_checksum, fs mounted w/o journal"); 3734 goto failed_mount_wq; 3735 } 3736 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3737 ext4_msg(sb, KERN_ERR, "can't mount with " 3738 "journal_async_commit, fs mounted w/o journal"); 3739 goto failed_mount_wq; 3740 } 3741 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 3742 ext4_msg(sb, KERN_ERR, "can't mount with " 3743 "commit=%lu, fs mounted w/o journal", 3744 sbi->s_commit_interval / HZ); 3745 goto failed_mount_wq; 3746 } 3747 if (EXT4_MOUNT_DATA_FLAGS & 3748 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { 3749 ext4_msg(sb, KERN_ERR, "can't mount with " 3750 "data=, fs mounted w/o journal"); 3751 goto failed_mount_wq; 3752 } 3753 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM; 3754 clear_opt(sb, JOURNAL_CHECKSUM); 3755 clear_opt(sb, DATA_FLAGS); 3756 sbi->s_journal = NULL; 3757 needs_recovery = 0; 3758 goto no_journal; 3759 } 3760 3761 if (ext4_has_feature_64bit(sb) && 3762 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 3763 JBD2_FEATURE_INCOMPAT_64BIT)) { 3764 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 3765 goto failed_mount_wq; 3766 } 3767 3768 if (!set_journal_csum_feature_set(sb)) { 3769 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " 3770 "feature set"); 3771 goto failed_mount_wq; 3772 } 3773 3774 /* We have now updated the journal if required, so we can 3775 * validate the data journaling mode. */ 3776 switch (test_opt(sb, DATA_FLAGS)) { 3777 case 0: 3778 /* No mode set, assume a default based on the journal 3779 * capabilities: ORDERED_DATA if the journal can 3780 * cope, else JOURNAL_DATA 3781 */ 3782 if (jbd2_journal_check_available_features 3783 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3784 set_opt(sb, ORDERED_DATA); 3785 else 3786 set_opt(sb, JOURNAL_DATA); 3787 break; 3788 3789 case EXT4_MOUNT_ORDERED_DATA: 3790 case EXT4_MOUNT_WRITEBACK_DATA: 3791 if (!jbd2_journal_check_available_features 3792 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3793 ext4_msg(sb, KERN_ERR, "Journal does not support " 3794 "requested data journaling mode"); 3795 goto failed_mount_wq; 3796 } 3797 default: 3798 break; 3799 } 3800 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3801 3802 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; 3803 3804 no_journal: 3805 sbi->s_mb_cache = ext4_xattr_create_cache(); 3806 if (!sbi->s_mb_cache) { 3807 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache"); 3808 goto failed_mount_wq; 3809 } 3810 3811 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) && 3812 (blocksize != PAGE_SIZE)) { 3813 ext4_msg(sb, KERN_ERR, 3814 "Unsupported blocksize for fs encryption"); 3815 goto failed_mount_wq; 3816 } 3817 3818 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) && 3819 !ext4_has_feature_encrypt(sb)) { 3820 ext4_set_feature_encrypt(sb); 3821 ext4_commit_super(sb, 1); 3822 } 3823 3824 /* 3825 * Get the # of file system overhead blocks from the 3826 * superblock if present. 3827 */ 3828 if (es->s_overhead_clusters) 3829 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); 3830 else { 3831 err = ext4_calculate_overhead(sb); 3832 if (err) 3833 goto failed_mount_wq; 3834 } 3835 3836 /* 3837 * The maximum number of concurrent works can be high and 3838 * concurrency isn't really necessary. Limit it to 1. 3839 */ 3840 EXT4_SB(sb)->rsv_conversion_wq = 3841 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 3842 if (!EXT4_SB(sb)->rsv_conversion_wq) { 3843 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); 3844 ret = -ENOMEM; 3845 goto failed_mount4; 3846 } 3847 3848 /* 3849 * The jbd2_journal_load will have done any necessary log recovery, 3850 * so we can safely mount the rest of the filesystem now. 3851 */ 3852 3853 root = ext4_iget(sb, EXT4_ROOT_INO); 3854 if (IS_ERR(root)) { 3855 ext4_msg(sb, KERN_ERR, "get root inode failed"); 3856 ret = PTR_ERR(root); 3857 root = NULL; 3858 goto failed_mount4; 3859 } 3860 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3861 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 3862 iput(root); 3863 goto failed_mount4; 3864 } 3865 sb->s_root = d_make_root(root); 3866 if (!sb->s_root) { 3867 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 3868 ret = -ENOMEM; 3869 goto failed_mount4; 3870 } 3871 3872 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) 3873 sb->s_flags |= MS_RDONLY; 3874 3875 /* determine the minimum size of new large inodes, if present */ 3876 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3877 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3878 EXT4_GOOD_OLD_INODE_SIZE; 3879 if (ext4_has_feature_extra_isize(sb)) { 3880 if (sbi->s_want_extra_isize < 3881 le16_to_cpu(es->s_want_extra_isize)) 3882 sbi->s_want_extra_isize = 3883 le16_to_cpu(es->s_want_extra_isize); 3884 if (sbi->s_want_extra_isize < 3885 le16_to_cpu(es->s_min_extra_isize)) 3886 sbi->s_want_extra_isize = 3887 le16_to_cpu(es->s_min_extra_isize); 3888 } 3889 } 3890 /* Check if enough inode space is available */ 3891 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3892 sbi->s_inode_size) { 3893 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3894 EXT4_GOOD_OLD_INODE_SIZE; 3895 ext4_msg(sb, KERN_INFO, "required extra inode space not" 3896 "available"); 3897 } 3898 3899 ext4_set_resv_clusters(sb); 3900 3901 err = ext4_setup_system_zone(sb); 3902 if (err) { 3903 ext4_msg(sb, KERN_ERR, "failed to initialize system " 3904 "zone (%d)", err); 3905 goto failed_mount4a; 3906 } 3907 3908 ext4_ext_init(sb); 3909 err = ext4_mb_init(sb); 3910 if (err) { 3911 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3912 err); 3913 goto failed_mount5; 3914 } 3915 3916 block = ext4_count_free_clusters(sb); 3917 ext4_free_blocks_count_set(sbi->s_es, 3918 EXT4_C2B(sbi, block)); 3919 err = percpu_counter_init(&sbi->s_freeclusters_counter, block, 3920 GFP_KERNEL); 3921 if (!err) { 3922 unsigned long freei = ext4_count_free_inodes(sb); 3923 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); 3924 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, 3925 GFP_KERNEL); 3926 } 3927 if (!err) 3928 err = percpu_counter_init(&sbi->s_dirs_counter, 3929 ext4_count_dirs(sb), GFP_KERNEL); 3930 if (!err) 3931 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, 3932 GFP_KERNEL); 3933 if (err) { 3934 ext4_msg(sb, KERN_ERR, "insufficient memory"); 3935 goto failed_mount6; 3936 } 3937 3938 if (ext4_has_feature_flex_bg(sb)) 3939 if (!ext4_fill_flex_info(sb)) { 3940 ext4_msg(sb, KERN_ERR, 3941 "unable to initialize " 3942 "flex_bg meta info!"); 3943 goto failed_mount6; 3944 } 3945 3946 err = ext4_register_li_request(sb, first_not_zeroed); 3947 if (err) 3948 goto failed_mount6; 3949 3950 err = ext4_register_sysfs(sb); 3951 if (err) 3952 goto failed_mount7; 3953 3954 #ifdef CONFIG_QUOTA 3955 /* Enable quota usage during mount. */ 3956 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) { 3957 err = ext4_enable_quotas(sb); 3958 if (err) 3959 goto failed_mount8; 3960 } 3961 #endif /* CONFIG_QUOTA */ 3962 3963 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3964 ext4_orphan_cleanup(sb, es); 3965 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 3966 if (needs_recovery) { 3967 ext4_msg(sb, KERN_INFO, "recovery complete"); 3968 ext4_mark_recovery_complete(sb, es); 3969 } 3970 if (EXT4_SB(sb)->s_journal) { 3971 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3972 descr = " journalled data mode"; 3973 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3974 descr = " ordered data mode"; 3975 else 3976 descr = " writeback data mode"; 3977 } else 3978 descr = "out journal"; 3979 3980 if (test_opt(sb, DISCARD)) { 3981 struct request_queue *q = bdev_get_queue(sb->s_bdev); 3982 if (!blk_queue_discard(q)) 3983 ext4_msg(sb, KERN_WARNING, 3984 "mounting with \"discard\" option, but " 3985 "the device does not support discard"); 3986 } 3987 3988 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount")) 3989 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 3990 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 3991 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 3992 3993 if (es->s_error_count) 3994 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 3995 3996 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ 3997 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); 3998 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); 3999 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); 4000 4001 kfree(orig_data); 4002 return 0; 4003 4004 cantfind_ext4: 4005 if (!silent) 4006 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 4007 goto failed_mount; 4008 4009 #ifdef CONFIG_QUOTA 4010 failed_mount8: 4011 ext4_unregister_sysfs(sb); 4012 #endif 4013 failed_mount7: 4014 ext4_unregister_li_request(sb); 4015 failed_mount6: 4016 ext4_mb_release(sb); 4017 if (sbi->s_flex_groups) 4018 kvfree(sbi->s_flex_groups); 4019 percpu_counter_destroy(&sbi->s_freeclusters_counter); 4020 percpu_counter_destroy(&sbi->s_freeinodes_counter); 4021 percpu_counter_destroy(&sbi->s_dirs_counter); 4022 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 4023 failed_mount5: 4024 ext4_ext_release(sb); 4025 ext4_release_system_zone(sb); 4026 failed_mount4a: 4027 dput(sb->s_root); 4028 sb->s_root = NULL; 4029 failed_mount4: 4030 ext4_msg(sb, KERN_ERR, "mount failed"); 4031 if (EXT4_SB(sb)->rsv_conversion_wq) 4032 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); 4033 failed_mount_wq: 4034 if (sbi->s_mb_cache) { 4035 ext4_xattr_destroy_cache(sbi->s_mb_cache); 4036 sbi->s_mb_cache = NULL; 4037 } 4038 if (sbi->s_journal) { 4039 jbd2_journal_destroy(sbi->s_journal); 4040 sbi->s_journal = NULL; 4041 } 4042 failed_mount3a: 4043 ext4_es_unregister_shrinker(sbi); 4044 failed_mount3: 4045 del_timer_sync(&sbi->s_err_report); 4046 if (sbi->s_mmp_tsk) 4047 kthread_stop(sbi->s_mmp_tsk); 4048 failed_mount2: 4049 for (i = 0; i < db_count; i++) 4050 brelse(sbi->s_group_desc[i]); 4051 kvfree(sbi->s_group_desc); 4052 failed_mount: 4053 if (sbi->s_chksum_driver) 4054 crypto_free_shash(sbi->s_chksum_driver); 4055 #ifdef CONFIG_QUOTA 4056 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4057 kfree(sbi->s_qf_names[i]); 4058 #endif 4059 ext4_blkdev_remove(sbi); 4060 brelse(bh); 4061 out_fail: 4062 sb->s_fs_info = NULL; 4063 kfree(sbi->s_blockgroup_lock); 4064 kfree(sbi); 4065 out_free_orig: 4066 kfree(orig_data); 4067 return err ? err : ret; 4068 } 4069 4070 /* 4071 * Setup any per-fs journal parameters now. We'll do this both on 4072 * initial mount, once the journal has been initialised but before we've 4073 * done any recovery; and again on any subsequent remount. 4074 */ 4075 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 4076 { 4077 struct ext4_sb_info *sbi = EXT4_SB(sb); 4078 4079 journal->j_commit_interval = sbi->s_commit_interval; 4080 journal->j_min_batch_time = sbi->s_min_batch_time; 4081 journal->j_max_batch_time = sbi->s_max_batch_time; 4082 4083 write_lock(&journal->j_state_lock); 4084 if (test_opt(sb, BARRIER)) 4085 journal->j_flags |= JBD2_BARRIER; 4086 else 4087 journal->j_flags &= ~JBD2_BARRIER; 4088 if (test_opt(sb, DATA_ERR_ABORT)) 4089 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 4090 else 4091 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 4092 write_unlock(&journal->j_state_lock); 4093 } 4094 4095 static journal_t *ext4_get_journal(struct super_block *sb, 4096 unsigned int journal_inum) 4097 { 4098 struct inode *journal_inode; 4099 journal_t *journal; 4100 4101 BUG_ON(!ext4_has_feature_journal(sb)); 4102 4103 /* First, test for the existence of a valid inode on disk. Bad 4104 * things happen if we iget() an unused inode, as the subsequent 4105 * iput() will try to delete it. */ 4106 4107 journal_inode = ext4_iget(sb, journal_inum); 4108 if (IS_ERR(journal_inode)) { 4109 ext4_msg(sb, KERN_ERR, "no journal found"); 4110 return NULL; 4111 } 4112 if (!journal_inode->i_nlink) { 4113 make_bad_inode(journal_inode); 4114 iput(journal_inode); 4115 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 4116 return NULL; 4117 } 4118 4119 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 4120 journal_inode, journal_inode->i_size); 4121 if (!S_ISREG(journal_inode->i_mode)) { 4122 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 4123 iput(journal_inode); 4124 return NULL; 4125 } 4126 4127 journal = jbd2_journal_init_inode(journal_inode); 4128 if (!journal) { 4129 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 4130 iput(journal_inode); 4131 return NULL; 4132 } 4133 journal->j_private = sb; 4134 ext4_init_journal_params(sb, journal); 4135 return journal; 4136 } 4137 4138 static journal_t *ext4_get_dev_journal(struct super_block *sb, 4139 dev_t j_dev) 4140 { 4141 struct buffer_head *bh; 4142 journal_t *journal; 4143 ext4_fsblk_t start; 4144 ext4_fsblk_t len; 4145 int hblock, blocksize; 4146 ext4_fsblk_t sb_block; 4147 unsigned long offset; 4148 struct ext4_super_block *es; 4149 struct block_device *bdev; 4150 4151 BUG_ON(!ext4_has_feature_journal(sb)); 4152 4153 bdev = ext4_blkdev_get(j_dev, sb); 4154 if (bdev == NULL) 4155 return NULL; 4156 4157 blocksize = sb->s_blocksize; 4158 hblock = bdev_logical_block_size(bdev); 4159 if (blocksize < hblock) { 4160 ext4_msg(sb, KERN_ERR, 4161 "blocksize too small for journal device"); 4162 goto out_bdev; 4163 } 4164 4165 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 4166 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 4167 set_blocksize(bdev, blocksize); 4168 if (!(bh = __bread(bdev, sb_block, blocksize))) { 4169 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 4170 "external journal"); 4171 goto out_bdev; 4172 } 4173 4174 es = (struct ext4_super_block *) (bh->b_data + offset); 4175 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 4176 !(le32_to_cpu(es->s_feature_incompat) & 4177 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 4178 ext4_msg(sb, KERN_ERR, "external journal has " 4179 "bad superblock"); 4180 brelse(bh); 4181 goto out_bdev; 4182 } 4183 4184 if ((le32_to_cpu(es->s_feature_ro_compat) & 4185 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 4186 es->s_checksum != ext4_superblock_csum(sb, es)) { 4187 ext4_msg(sb, KERN_ERR, "external journal has " 4188 "corrupt superblock"); 4189 brelse(bh); 4190 goto out_bdev; 4191 } 4192 4193 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 4194 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 4195 brelse(bh); 4196 goto out_bdev; 4197 } 4198 4199 len = ext4_blocks_count(es); 4200 start = sb_block + 1; 4201 brelse(bh); /* we're done with the superblock */ 4202 4203 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 4204 start, len, blocksize); 4205 if (!journal) { 4206 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 4207 goto out_bdev; 4208 } 4209 journal->j_private = sb; 4210 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer); 4211 wait_on_buffer(journal->j_sb_buffer); 4212 if (!buffer_uptodate(journal->j_sb_buffer)) { 4213 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 4214 goto out_journal; 4215 } 4216 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 4217 ext4_msg(sb, KERN_ERR, "External journal has more than one " 4218 "user (unsupported) - %d", 4219 be32_to_cpu(journal->j_superblock->s_nr_users)); 4220 goto out_journal; 4221 } 4222 EXT4_SB(sb)->journal_bdev = bdev; 4223 ext4_init_journal_params(sb, journal); 4224 return journal; 4225 4226 out_journal: 4227 jbd2_journal_destroy(journal); 4228 out_bdev: 4229 ext4_blkdev_put(bdev); 4230 return NULL; 4231 } 4232 4233 static int ext4_load_journal(struct super_block *sb, 4234 struct ext4_super_block *es, 4235 unsigned long journal_devnum) 4236 { 4237 journal_t *journal; 4238 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 4239 dev_t journal_dev; 4240 int err = 0; 4241 int really_read_only; 4242 4243 BUG_ON(!ext4_has_feature_journal(sb)); 4244 4245 if (journal_devnum && 4246 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4247 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 4248 "numbers have changed"); 4249 journal_dev = new_decode_dev(journal_devnum); 4250 } else 4251 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 4252 4253 really_read_only = bdev_read_only(sb->s_bdev); 4254 4255 /* 4256 * Are we loading a blank journal or performing recovery after a 4257 * crash? For recovery, we need to check in advance whether we 4258 * can get read-write access to the device. 4259 */ 4260 if (ext4_has_feature_journal_needs_recovery(sb)) { 4261 if (sb->s_flags & MS_RDONLY) { 4262 ext4_msg(sb, KERN_INFO, "INFO: recovery " 4263 "required on readonly filesystem"); 4264 if (really_read_only) { 4265 ext4_msg(sb, KERN_ERR, "write access " 4266 "unavailable, cannot proceed"); 4267 return -EROFS; 4268 } 4269 ext4_msg(sb, KERN_INFO, "write access will " 4270 "be enabled during recovery"); 4271 } 4272 } 4273 4274 if (journal_inum && journal_dev) { 4275 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4276 "and inode journals!"); 4277 return -EINVAL; 4278 } 4279 4280 if (journal_inum) { 4281 if (!(journal = ext4_get_journal(sb, journal_inum))) 4282 return -EINVAL; 4283 } else { 4284 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4285 return -EINVAL; 4286 } 4287 4288 if (!(journal->j_flags & JBD2_BARRIER)) 4289 ext4_msg(sb, KERN_INFO, "barriers disabled"); 4290 4291 if (!ext4_has_feature_journal_needs_recovery(sb)) 4292 err = jbd2_journal_wipe(journal, !really_read_only); 4293 if (!err) { 4294 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 4295 if (save) 4296 memcpy(save, ((char *) es) + 4297 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4298 err = jbd2_journal_load(journal); 4299 if (save) 4300 memcpy(((char *) es) + EXT4_S_ERR_START, 4301 save, EXT4_S_ERR_LEN); 4302 kfree(save); 4303 } 4304 4305 if (err) { 4306 ext4_msg(sb, KERN_ERR, "error loading journal"); 4307 jbd2_journal_destroy(journal); 4308 return err; 4309 } 4310 4311 EXT4_SB(sb)->s_journal = journal; 4312 ext4_clear_journal_err(sb, es); 4313 4314 if (!really_read_only && journal_devnum && 4315 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4316 es->s_journal_dev = cpu_to_le32(journal_devnum); 4317 4318 /* Make sure we flush the recovery flag to disk. */ 4319 ext4_commit_super(sb, 1); 4320 } 4321 4322 return 0; 4323 } 4324 4325 static int ext4_commit_super(struct super_block *sb, int sync) 4326 { 4327 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4328 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4329 int error = 0; 4330 4331 if (!sbh || block_device_ejected(sb)) 4332 return error; 4333 if (buffer_write_io_error(sbh)) { 4334 /* 4335 * Oh, dear. A previous attempt to write the 4336 * superblock failed. This could happen because the 4337 * USB device was yanked out. Or it could happen to 4338 * be a transient write error and maybe the block will 4339 * be remapped. Nothing we can do but to retry the 4340 * write and hope for the best. 4341 */ 4342 ext4_msg(sb, KERN_ERR, "previous I/O error to " 4343 "superblock detected"); 4344 clear_buffer_write_io_error(sbh); 4345 set_buffer_uptodate(sbh); 4346 } 4347 /* 4348 * If the file system is mounted read-only, don't update the 4349 * superblock write time. This avoids updating the superblock 4350 * write time when we are mounting the root file system 4351 * read/only but we need to replay the journal; at that point, 4352 * for people who are east of GMT and who make their clock 4353 * tick in localtime for Windows bug-for-bug compatibility, 4354 * the clock is set in the future, and this will cause e2fsck 4355 * to complain and force a full file system check. 4356 */ 4357 if (!(sb->s_flags & MS_RDONLY)) 4358 es->s_wtime = cpu_to_le32(get_seconds()); 4359 if (sb->s_bdev->bd_part) 4360 es->s_kbytes_written = 4361 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4362 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4363 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4364 else 4365 es->s_kbytes_written = 4366 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 4367 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter)) 4368 ext4_free_blocks_count_set(es, 4369 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( 4370 &EXT4_SB(sb)->s_freeclusters_counter))); 4371 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter)) 4372 es->s_free_inodes_count = 4373 cpu_to_le32(percpu_counter_sum_positive( 4374 &EXT4_SB(sb)->s_freeinodes_counter)); 4375 BUFFER_TRACE(sbh, "marking dirty"); 4376 ext4_superblock_csum_set(sb); 4377 mark_buffer_dirty(sbh); 4378 if (sync) { 4379 error = __sync_dirty_buffer(sbh, 4380 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC); 4381 if (error) 4382 return error; 4383 4384 error = buffer_write_io_error(sbh); 4385 if (error) { 4386 ext4_msg(sb, KERN_ERR, "I/O error while writing " 4387 "superblock"); 4388 clear_buffer_write_io_error(sbh); 4389 set_buffer_uptodate(sbh); 4390 } 4391 } 4392 return error; 4393 } 4394 4395 /* 4396 * Have we just finished recovery? If so, and if we are mounting (or 4397 * remounting) the filesystem readonly, then we will end up with a 4398 * consistent fs on disk. Record that fact. 4399 */ 4400 static void ext4_mark_recovery_complete(struct super_block *sb, 4401 struct ext4_super_block *es) 4402 { 4403 journal_t *journal = EXT4_SB(sb)->s_journal; 4404 4405 if (!ext4_has_feature_journal(sb)) { 4406 BUG_ON(journal != NULL); 4407 return; 4408 } 4409 jbd2_journal_lock_updates(journal); 4410 if (jbd2_journal_flush(journal) < 0) 4411 goto out; 4412 4413 if (ext4_has_feature_journal_needs_recovery(sb) && 4414 sb->s_flags & MS_RDONLY) { 4415 ext4_clear_feature_journal_needs_recovery(sb); 4416 ext4_commit_super(sb, 1); 4417 } 4418 4419 out: 4420 jbd2_journal_unlock_updates(journal); 4421 } 4422 4423 /* 4424 * If we are mounting (or read-write remounting) a filesystem whose journal 4425 * has recorded an error from a previous lifetime, move that error to the 4426 * main filesystem now. 4427 */ 4428 static void ext4_clear_journal_err(struct super_block *sb, 4429 struct ext4_super_block *es) 4430 { 4431 journal_t *journal; 4432 int j_errno; 4433 const char *errstr; 4434 4435 BUG_ON(!ext4_has_feature_journal(sb)); 4436 4437 journal = EXT4_SB(sb)->s_journal; 4438 4439 /* 4440 * Now check for any error status which may have been recorded in the 4441 * journal by a prior ext4_error() or ext4_abort() 4442 */ 4443 4444 j_errno = jbd2_journal_errno(journal); 4445 if (j_errno) { 4446 char nbuf[16]; 4447 4448 errstr = ext4_decode_error(sb, j_errno, nbuf); 4449 ext4_warning(sb, "Filesystem error recorded " 4450 "from previous mount: %s", errstr); 4451 ext4_warning(sb, "Marking fs in need of filesystem check."); 4452 4453 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4454 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4455 ext4_commit_super(sb, 1); 4456 4457 jbd2_journal_clear_err(journal); 4458 jbd2_journal_update_sb_errno(journal); 4459 } 4460 } 4461 4462 /* 4463 * Force the running and committing transactions to commit, 4464 * and wait on the commit. 4465 */ 4466 int ext4_force_commit(struct super_block *sb) 4467 { 4468 journal_t *journal; 4469 4470 if (sb->s_flags & MS_RDONLY) 4471 return 0; 4472 4473 journal = EXT4_SB(sb)->s_journal; 4474 return ext4_journal_force_commit(journal); 4475 } 4476 4477 static int ext4_sync_fs(struct super_block *sb, int wait) 4478 { 4479 int ret = 0; 4480 tid_t target; 4481 bool needs_barrier = false; 4482 struct ext4_sb_info *sbi = EXT4_SB(sb); 4483 4484 trace_ext4_sync_fs(sb, wait); 4485 flush_workqueue(sbi->rsv_conversion_wq); 4486 /* 4487 * Writeback quota in non-journalled quota case - journalled quota has 4488 * no dirty dquots 4489 */ 4490 dquot_writeback_dquots(sb, -1); 4491 /* 4492 * Data writeback is possible w/o journal transaction, so barrier must 4493 * being sent at the end of the function. But we can skip it if 4494 * transaction_commit will do it for us. 4495 */ 4496 if (sbi->s_journal) { 4497 target = jbd2_get_latest_transaction(sbi->s_journal); 4498 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && 4499 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) 4500 needs_barrier = true; 4501 4502 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4503 if (wait) 4504 ret = jbd2_log_wait_commit(sbi->s_journal, 4505 target); 4506 } 4507 } else if (wait && test_opt(sb, BARRIER)) 4508 needs_barrier = true; 4509 if (needs_barrier) { 4510 int err; 4511 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 4512 if (!ret) 4513 ret = err; 4514 } 4515 4516 return ret; 4517 } 4518 4519 /* 4520 * LVM calls this function before a (read-only) snapshot is created. This 4521 * gives us a chance to flush the journal completely and mark the fs clean. 4522 * 4523 * Note that only this function cannot bring a filesystem to be in a clean 4524 * state independently. It relies on upper layer to stop all data & metadata 4525 * modifications. 4526 */ 4527 static int ext4_freeze(struct super_block *sb) 4528 { 4529 int error = 0; 4530 journal_t *journal; 4531 4532 if (sb->s_flags & MS_RDONLY) 4533 return 0; 4534 4535 journal = EXT4_SB(sb)->s_journal; 4536 4537 if (journal) { 4538 /* Now we set up the journal barrier. */ 4539 jbd2_journal_lock_updates(journal); 4540 4541 /* 4542 * Don't clear the needs_recovery flag if we failed to 4543 * flush the journal. 4544 */ 4545 error = jbd2_journal_flush(journal); 4546 if (error < 0) 4547 goto out; 4548 4549 /* Journal blocked and flushed, clear needs_recovery flag. */ 4550 ext4_clear_feature_journal_needs_recovery(sb); 4551 } 4552 4553 error = ext4_commit_super(sb, 1); 4554 out: 4555 if (journal) 4556 /* we rely on upper layer to stop further updates */ 4557 jbd2_journal_unlock_updates(journal); 4558 return error; 4559 } 4560 4561 /* 4562 * Called by LVM after the snapshot is done. We need to reset the RECOVER 4563 * flag here, even though the filesystem is not technically dirty yet. 4564 */ 4565 static int ext4_unfreeze(struct super_block *sb) 4566 { 4567 if (sb->s_flags & MS_RDONLY) 4568 return 0; 4569 4570 if (EXT4_SB(sb)->s_journal) { 4571 /* Reset the needs_recovery flag before the fs is unlocked. */ 4572 ext4_set_feature_journal_needs_recovery(sb); 4573 } 4574 4575 ext4_commit_super(sb, 1); 4576 return 0; 4577 } 4578 4579 /* 4580 * Structure to save mount options for ext4_remount's benefit 4581 */ 4582 struct ext4_mount_options { 4583 unsigned long s_mount_opt; 4584 unsigned long s_mount_opt2; 4585 kuid_t s_resuid; 4586 kgid_t s_resgid; 4587 unsigned long s_commit_interval; 4588 u32 s_min_batch_time, s_max_batch_time; 4589 #ifdef CONFIG_QUOTA 4590 int s_jquota_fmt; 4591 char *s_qf_names[EXT4_MAXQUOTAS]; 4592 #endif 4593 }; 4594 4595 static int ext4_remount(struct super_block *sb, int *flags, char *data) 4596 { 4597 struct ext4_super_block *es; 4598 struct ext4_sb_info *sbi = EXT4_SB(sb); 4599 unsigned long old_sb_flags; 4600 struct ext4_mount_options old_opts; 4601 int enable_quota = 0; 4602 ext4_group_t g; 4603 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4604 int err = 0; 4605 #ifdef CONFIG_QUOTA 4606 int i, j; 4607 #endif 4608 char *orig_data = kstrdup(data, GFP_KERNEL); 4609 4610 /* Store the original options */ 4611 old_sb_flags = sb->s_flags; 4612 old_opts.s_mount_opt = sbi->s_mount_opt; 4613 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4614 old_opts.s_resuid = sbi->s_resuid; 4615 old_opts.s_resgid = sbi->s_resgid; 4616 old_opts.s_commit_interval = sbi->s_commit_interval; 4617 old_opts.s_min_batch_time = sbi->s_min_batch_time; 4618 old_opts.s_max_batch_time = sbi->s_max_batch_time; 4619 #ifdef CONFIG_QUOTA 4620 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4621 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4622 if (sbi->s_qf_names[i]) { 4623 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], 4624 GFP_KERNEL); 4625 if (!old_opts.s_qf_names[i]) { 4626 for (j = 0; j < i; j++) 4627 kfree(old_opts.s_qf_names[j]); 4628 kfree(orig_data); 4629 return -ENOMEM; 4630 } 4631 } else 4632 old_opts.s_qf_names[i] = NULL; 4633 #endif 4634 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4635 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4636 4637 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { 4638 err = -EINVAL; 4639 goto restore_opts; 4640 } 4641 4642 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ 4643 test_opt(sb, JOURNAL_CHECKSUM)) { 4644 ext4_msg(sb, KERN_ERR, "changing journal_checksum " 4645 "during remount not supported; ignoring"); 4646 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; 4647 } 4648 4649 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 4650 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 4651 ext4_msg(sb, KERN_ERR, "can't mount with " 4652 "both data=journal and delalloc"); 4653 err = -EINVAL; 4654 goto restore_opts; 4655 } 4656 if (test_opt(sb, DIOREAD_NOLOCK)) { 4657 ext4_msg(sb, KERN_ERR, "can't mount with " 4658 "both data=journal and dioread_nolock"); 4659 err = -EINVAL; 4660 goto restore_opts; 4661 } 4662 if (test_opt(sb, DAX)) { 4663 ext4_msg(sb, KERN_ERR, "can't mount with " 4664 "both data=journal and dax"); 4665 err = -EINVAL; 4666 goto restore_opts; 4667 } 4668 } 4669 4670 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) { 4671 ext4_msg(sb, KERN_WARNING, "warning: refusing change of " 4672 "dax flag with busy inodes while remounting"); 4673 sbi->s_mount_opt ^= EXT4_MOUNT_DAX; 4674 } 4675 4676 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 4677 ext4_abort(sb, "Abort forced by user"); 4678 4679 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 4680 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 4681 4682 es = sbi->s_es; 4683 4684 if (sbi->s_journal) { 4685 ext4_init_journal_params(sb, sbi->s_journal); 4686 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4687 } 4688 4689 if (*flags & MS_LAZYTIME) 4690 sb->s_flags |= MS_LAZYTIME; 4691 4692 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { 4693 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 4694 err = -EROFS; 4695 goto restore_opts; 4696 } 4697 4698 if (*flags & MS_RDONLY) { 4699 err = sync_filesystem(sb); 4700 if (err < 0) 4701 goto restore_opts; 4702 err = dquot_suspend(sb, -1); 4703 if (err < 0) 4704 goto restore_opts; 4705 4706 /* 4707 * First of all, the unconditional stuff we have to do 4708 * to disable replay of the journal when we next remount 4709 */ 4710 sb->s_flags |= MS_RDONLY; 4711 4712 /* 4713 * OK, test if we are remounting a valid rw partition 4714 * readonly, and if so set the rdonly flag and then 4715 * mark the partition as valid again. 4716 */ 4717 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 4718 (sbi->s_mount_state & EXT4_VALID_FS)) 4719 es->s_state = cpu_to_le16(sbi->s_mount_state); 4720 4721 if (sbi->s_journal) 4722 ext4_mark_recovery_complete(sb, es); 4723 } else { 4724 /* Make sure we can mount this feature set readwrite */ 4725 if (ext4_has_feature_readonly(sb) || 4726 !ext4_feature_set_ok(sb, 0)) { 4727 err = -EROFS; 4728 goto restore_opts; 4729 } 4730 /* 4731 * Make sure the group descriptor checksums 4732 * are sane. If they aren't, refuse to remount r/w. 4733 */ 4734 for (g = 0; g < sbi->s_groups_count; g++) { 4735 struct ext4_group_desc *gdp = 4736 ext4_get_group_desc(sb, g, NULL); 4737 4738 if (!ext4_group_desc_csum_verify(sb, g, gdp)) { 4739 ext4_msg(sb, KERN_ERR, 4740 "ext4_remount: Checksum for group %u failed (%u!=%u)", 4741 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)), 4742 le16_to_cpu(gdp->bg_checksum)); 4743 err = -EFSBADCRC; 4744 goto restore_opts; 4745 } 4746 } 4747 4748 /* 4749 * If we have an unprocessed orphan list hanging 4750 * around from a previously readonly bdev mount, 4751 * require a full umount/remount for now. 4752 */ 4753 if (es->s_last_orphan) { 4754 ext4_msg(sb, KERN_WARNING, "Couldn't " 4755 "remount RDWR because of unprocessed " 4756 "orphan inode list. Please " 4757 "umount/remount instead"); 4758 err = -EINVAL; 4759 goto restore_opts; 4760 } 4761 4762 /* 4763 * Mounting a RDONLY partition read-write, so reread 4764 * and store the current valid flag. (It may have 4765 * been changed by e2fsck since we originally mounted 4766 * the partition.) 4767 */ 4768 if (sbi->s_journal) 4769 ext4_clear_journal_err(sb, es); 4770 sbi->s_mount_state = le16_to_cpu(es->s_state); 4771 if (!ext4_setup_super(sb, es, 0)) 4772 sb->s_flags &= ~MS_RDONLY; 4773 if (ext4_has_feature_mmp(sb)) 4774 if (ext4_multi_mount_protect(sb, 4775 le64_to_cpu(es->s_mmp_block))) { 4776 err = -EROFS; 4777 goto restore_opts; 4778 } 4779 enable_quota = 1; 4780 } 4781 } 4782 4783 /* 4784 * Reinitialize lazy itable initialization thread based on 4785 * current settings 4786 */ 4787 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 4788 ext4_unregister_li_request(sb); 4789 else { 4790 ext4_group_t first_not_zeroed; 4791 first_not_zeroed = ext4_has_uninit_itable(sb); 4792 ext4_register_li_request(sb, first_not_zeroed); 4793 } 4794 4795 ext4_setup_system_zone(sb); 4796 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) 4797 ext4_commit_super(sb, 1); 4798 4799 #ifdef CONFIG_QUOTA 4800 /* Release old quota file names */ 4801 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4802 kfree(old_opts.s_qf_names[i]); 4803 if (enable_quota) { 4804 if (sb_any_quota_suspended(sb)) 4805 dquot_resume(sb, -1); 4806 else if (ext4_has_feature_quota(sb)) { 4807 err = ext4_enable_quotas(sb); 4808 if (err) 4809 goto restore_opts; 4810 } 4811 } 4812 #endif 4813 4814 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME); 4815 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 4816 kfree(orig_data); 4817 return 0; 4818 4819 restore_opts: 4820 sb->s_flags = old_sb_flags; 4821 sbi->s_mount_opt = old_opts.s_mount_opt; 4822 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 4823 sbi->s_resuid = old_opts.s_resuid; 4824 sbi->s_resgid = old_opts.s_resgid; 4825 sbi->s_commit_interval = old_opts.s_commit_interval; 4826 sbi->s_min_batch_time = old_opts.s_min_batch_time; 4827 sbi->s_max_batch_time = old_opts.s_max_batch_time; 4828 #ifdef CONFIG_QUOTA 4829 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 4830 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 4831 kfree(sbi->s_qf_names[i]); 4832 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 4833 } 4834 #endif 4835 kfree(orig_data); 4836 return err; 4837 } 4838 4839 #ifdef CONFIG_QUOTA 4840 static int ext4_statfs_project(struct super_block *sb, 4841 kprojid_t projid, struct kstatfs *buf) 4842 { 4843 struct kqid qid; 4844 struct dquot *dquot; 4845 u64 limit; 4846 u64 curblock; 4847 4848 qid = make_kqid_projid(projid); 4849 dquot = dqget(sb, qid); 4850 if (IS_ERR(dquot)) 4851 return PTR_ERR(dquot); 4852 spin_lock(&dq_data_lock); 4853 4854 limit = (dquot->dq_dqb.dqb_bsoftlimit ? 4855 dquot->dq_dqb.dqb_bsoftlimit : 4856 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits; 4857 if (limit && buf->f_blocks > limit) { 4858 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits; 4859 buf->f_blocks = limit; 4860 buf->f_bfree = buf->f_bavail = 4861 (buf->f_blocks > curblock) ? 4862 (buf->f_blocks - curblock) : 0; 4863 } 4864 4865 limit = dquot->dq_dqb.dqb_isoftlimit ? 4866 dquot->dq_dqb.dqb_isoftlimit : 4867 dquot->dq_dqb.dqb_ihardlimit; 4868 if (limit && buf->f_files > limit) { 4869 buf->f_files = limit; 4870 buf->f_ffree = 4871 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ? 4872 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0; 4873 } 4874 4875 spin_unlock(&dq_data_lock); 4876 dqput(dquot); 4877 return 0; 4878 } 4879 #endif 4880 4881 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 4882 { 4883 struct super_block *sb = dentry->d_sb; 4884 struct ext4_sb_info *sbi = EXT4_SB(sb); 4885 struct ext4_super_block *es = sbi->s_es; 4886 ext4_fsblk_t overhead = 0, resv_blocks; 4887 u64 fsid; 4888 s64 bfree; 4889 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); 4890 4891 if (!test_opt(sb, MINIX_DF)) 4892 overhead = sbi->s_overhead; 4893 4894 buf->f_type = EXT4_SUPER_MAGIC; 4895 buf->f_bsize = sb->s_blocksize; 4896 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); 4897 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 4898 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 4899 /* prevent underflow in case that few free space is available */ 4900 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 4901 buf->f_bavail = buf->f_bfree - 4902 (ext4_r_blocks_count(es) + resv_blocks); 4903 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) 4904 buf->f_bavail = 0; 4905 buf->f_files = le32_to_cpu(es->s_inodes_count); 4906 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 4907 buf->f_namelen = EXT4_NAME_LEN; 4908 fsid = le64_to_cpup((void *)es->s_uuid) ^ 4909 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 4910 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 4911 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 4912 4913 #ifdef CONFIG_QUOTA 4914 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) && 4915 sb_has_quota_limits_enabled(sb, PRJQUOTA)) 4916 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf); 4917 #endif 4918 return 0; 4919 } 4920 4921 /* Helper function for writing quotas on sync - we need to start transaction 4922 * before quota file is locked for write. Otherwise the are possible deadlocks: 4923 * Process 1 Process 2 4924 * ext4_create() quota_sync() 4925 * jbd2_journal_start() write_dquot() 4926 * dquot_initialize() down(dqio_mutex) 4927 * down(dqio_mutex) jbd2_journal_start() 4928 * 4929 */ 4930 4931 #ifdef CONFIG_QUOTA 4932 4933 static inline struct inode *dquot_to_inode(struct dquot *dquot) 4934 { 4935 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 4936 } 4937 4938 static int ext4_write_dquot(struct dquot *dquot) 4939 { 4940 int ret, err; 4941 handle_t *handle; 4942 struct inode *inode; 4943 4944 inode = dquot_to_inode(dquot); 4945 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 4946 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 4947 if (IS_ERR(handle)) 4948 return PTR_ERR(handle); 4949 ret = dquot_commit(dquot); 4950 err = ext4_journal_stop(handle); 4951 if (!ret) 4952 ret = err; 4953 return ret; 4954 } 4955 4956 static int ext4_acquire_dquot(struct dquot *dquot) 4957 { 4958 int ret, err; 4959 handle_t *handle; 4960 4961 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 4962 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 4963 if (IS_ERR(handle)) 4964 return PTR_ERR(handle); 4965 ret = dquot_acquire(dquot); 4966 err = ext4_journal_stop(handle); 4967 if (!ret) 4968 ret = err; 4969 return ret; 4970 } 4971 4972 static int ext4_release_dquot(struct dquot *dquot) 4973 { 4974 int ret, err; 4975 handle_t *handle; 4976 4977 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 4978 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 4979 if (IS_ERR(handle)) { 4980 /* Release dquot anyway to avoid endless cycle in dqput() */ 4981 dquot_release(dquot); 4982 return PTR_ERR(handle); 4983 } 4984 ret = dquot_release(dquot); 4985 err = ext4_journal_stop(handle); 4986 if (!ret) 4987 ret = err; 4988 return ret; 4989 } 4990 4991 static int ext4_mark_dquot_dirty(struct dquot *dquot) 4992 { 4993 struct super_block *sb = dquot->dq_sb; 4994 struct ext4_sb_info *sbi = EXT4_SB(sb); 4995 4996 /* Are we journaling quotas? */ 4997 if (ext4_has_feature_quota(sb) || 4998 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 4999 dquot_mark_dquot_dirty(dquot); 5000 return ext4_write_dquot(dquot); 5001 } else { 5002 return dquot_mark_dquot_dirty(dquot); 5003 } 5004 } 5005 5006 static int ext4_write_info(struct super_block *sb, int type) 5007 { 5008 int ret, err; 5009 handle_t *handle; 5010 5011 /* Data block + inode block */ 5012 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2); 5013 if (IS_ERR(handle)) 5014 return PTR_ERR(handle); 5015 ret = dquot_commit_info(sb, type); 5016 err = ext4_journal_stop(handle); 5017 if (!ret) 5018 ret = err; 5019 return ret; 5020 } 5021 5022 /* 5023 * Turn on quotas during mount time - we need to find 5024 * the quota file and such... 5025 */ 5026 static int ext4_quota_on_mount(struct super_block *sb, int type) 5027 { 5028 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 5029 EXT4_SB(sb)->s_jquota_fmt, type); 5030 } 5031 5032 static void lockdep_set_quota_inode(struct inode *inode, int subclass) 5033 { 5034 struct ext4_inode_info *ei = EXT4_I(inode); 5035 5036 /* The first argument of lockdep_set_subclass has to be 5037 * *exactly* the same as the argument to init_rwsem() --- in 5038 * this case, in init_once() --- or lockdep gets unhappy 5039 * because the name of the lock is set using the 5040 * stringification of the argument to init_rwsem(). 5041 */ 5042 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ 5043 lockdep_set_subclass(&ei->i_data_sem, subclass); 5044 } 5045 5046 /* 5047 * Standard function to be called on quota_on 5048 */ 5049 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 5050 struct path *path) 5051 { 5052 int err; 5053 5054 if (!test_opt(sb, QUOTA)) 5055 return -EINVAL; 5056 5057 /* Quotafile not on the same filesystem? */ 5058 if (path->dentry->d_sb != sb) 5059 return -EXDEV; 5060 /* Journaling quota? */ 5061 if (EXT4_SB(sb)->s_qf_names[type]) { 5062 /* Quotafile not in fs root? */ 5063 if (path->dentry->d_parent != sb->s_root) 5064 ext4_msg(sb, KERN_WARNING, 5065 "Quota file not on filesystem root. " 5066 "Journaled quota will not work"); 5067 } 5068 5069 /* 5070 * When we journal data on quota file, we have to flush journal to see 5071 * all updates to the file when we bypass pagecache... 5072 */ 5073 if (EXT4_SB(sb)->s_journal && 5074 ext4_should_journal_data(d_inode(path->dentry))) { 5075 /* 5076 * We don't need to lock updates but journal_flush() could 5077 * otherwise be livelocked... 5078 */ 5079 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 5080 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 5081 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 5082 if (err) 5083 return err; 5084 } 5085 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA); 5086 err = dquot_quota_on(sb, type, format_id, path); 5087 if (err) 5088 lockdep_set_quota_inode(path->dentry->d_inode, 5089 I_DATA_SEM_NORMAL); 5090 return err; 5091 } 5092 5093 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 5094 unsigned int flags) 5095 { 5096 int err; 5097 struct inode *qf_inode; 5098 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 5099 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 5100 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 5101 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 5102 }; 5103 5104 BUG_ON(!ext4_has_feature_quota(sb)); 5105 5106 if (!qf_inums[type]) 5107 return -EPERM; 5108 5109 qf_inode = ext4_iget(sb, qf_inums[type]); 5110 if (IS_ERR(qf_inode)) { 5111 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); 5112 return PTR_ERR(qf_inode); 5113 } 5114 5115 /* Don't account quota for quota files to avoid recursion */ 5116 qf_inode->i_flags |= S_NOQUOTA; 5117 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); 5118 err = dquot_enable(qf_inode, type, format_id, flags); 5119 iput(qf_inode); 5120 if (err) 5121 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); 5122 5123 return err; 5124 } 5125 5126 /* Enable usage tracking for all quota types. */ 5127 static int ext4_enable_quotas(struct super_block *sb) 5128 { 5129 int type, err = 0; 5130 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 5131 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 5132 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 5133 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 5134 }; 5135 5136 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 5137 for (type = 0; type < EXT4_MAXQUOTAS; type++) { 5138 if (qf_inums[type]) { 5139 err = ext4_quota_enable(sb, type, QFMT_VFS_V1, 5140 DQUOT_USAGE_ENABLED); 5141 if (err) { 5142 ext4_warning(sb, 5143 "Failed to enable quota tracking " 5144 "(type=%d, err=%d). Please run " 5145 "e2fsck to fix.", type, err); 5146 return err; 5147 } 5148 } 5149 } 5150 return 0; 5151 } 5152 5153 static int ext4_quota_off(struct super_block *sb, int type) 5154 { 5155 struct inode *inode = sb_dqopt(sb)->files[type]; 5156 handle_t *handle; 5157 5158 /* Force all delayed allocation blocks to be allocated. 5159 * Caller already holds s_umount sem */ 5160 if (test_opt(sb, DELALLOC)) 5161 sync_filesystem(sb); 5162 5163 if (!inode) 5164 goto out; 5165 5166 /* Update modification times of quota files when userspace can 5167 * start looking at them */ 5168 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 5169 if (IS_ERR(handle)) 5170 goto out; 5171 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5172 ext4_mark_inode_dirty(handle, inode); 5173 ext4_journal_stop(handle); 5174 5175 out: 5176 return dquot_quota_off(sb, type); 5177 } 5178 5179 /* Read data from quotafile - avoid pagecache and such because we cannot afford 5180 * acquiring the locks... As quota files are never truncated and quota code 5181 * itself serializes the operations (and no one else should touch the files) 5182 * we don't have to be afraid of races */ 5183 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 5184 size_t len, loff_t off) 5185 { 5186 struct inode *inode = sb_dqopt(sb)->files[type]; 5187 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5188 int offset = off & (sb->s_blocksize - 1); 5189 int tocopy; 5190 size_t toread; 5191 struct buffer_head *bh; 5192 loff_t i_size = i_size_read(inode); 5193 5194 if (off > i_size) 5195 return 0; 5196 if (off+len > i_size) 5197 len = i_size-off; 5198 toread = len; 5199 while (toread > 0) { 5200 tocopy = sb->s_blocksize - offset < toread ? 5201 sb->s_blocksize - offset : toread; 5202 bh = ext4_bread(NULL, inode, blk, 0); 5203 if (IS_ERR(bh)) 5204 return PTR_ERR(bh); 5205 if (!bh) /* A hole? */ 5206 memset(data, 0, tocopy); 5207 else 5208 memcpy(data, bh->b_data+offset, tocopy); 5209 brelse(bh); 5210 offset = 0; 5211 toread -= tocopy; 5212 data += tocopy; 5213 blk++; 5214 } 5215 return len; 5216 } 5217 5218 /* Write to quotafile (we know the transaction is already started and has 5219 * enough credits) */ 5220 static ssize_t ext4_quota_write(struct super_block *sb, int type, 5221 const char *data, size_t len, loff_t off) 5222 { 5223 struct inode *inode = sb_dqopt(sb)->files[type]; 5224 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5225 int err, offset = off & (sb->s_blocksize - 1); 5226 int retries = 0; 5227 struct buffer_head *bh; 5228 handle_t *handle = journal_current_handle(); 5229 5230 if (EXT4_SB(sb)->s_journal && !handle) { 5231 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5232 " cancelled because transaction is not started", 5233 (unsigned long long)off, (unsigned long long)len); 5234 return -EIO; 5235 } 5236 /* 5237 * Since we account only one data block in transaction credits, 5238 * then it is impossible to cross a block boundary. 5239 */ 5240 if (sb->s_blocksize - offset < len) { 5241 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5242 " cancelled because not block aligned", 5243 (unsigned long long)off, (unsigned long long)len); 5244 return -EIO; 5245 } 5246 5247 do { 5248 bh = ext4_bread(handle, inode, blk, 5249 EXT4_GET_BLOCKS_CREATE | 5250 EXT4_GET_BLOCKS_METADATA_NOFAIL); 5251 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) && 5252 ext4_should_retry_alloc(inode->i_sb, &retries)); 5253 if (IS_ERR(bh)) 5254 return PTR_ERR(bh); 5255 if (!bh) 5256 goto out; 5257 BUFFER_TRACE(bh, "get write access"); 5258 err = ext4_journal_get_write_access(handle, bh); 5259 if (err) { 5260 brelse(bh); 5261 return err; 5262 } 5263 lock_buffer(bh); 5264 memcpy(bh->b_data+offset, data, len); 5265 flush_dcache_page(bh->b_page); 5266 unlock_buffer(bh); 5267 err = ext4_handle_dirty_metadata(handle, NULL, bh); 5268 brelse(bh); 5269 out: 5270 if (inode->i_size < off + len) { 5271 i_size_write(inode, off + len); 5272 EXT4_I(inode)->i_disksize = inode->i_size; 5273 ext4_mark_inode_dirty(handle, inode); 5274 } 5275 return len; 5276 } 5277 5278 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid) 5279 { 5280 const struct quota_format_ops *ops; 5281 5282 if (!sb_has_quota_loaded(sb, qid->type)) 5283 return -ESRCH; 5284 ops = sb_dqopt(sb)->ops[qid->type]; 5285 if (!ops || !ops->get_next_id) 5286 return -ENOSYS; 5287 return dquot_get_next_id(sb, qid); 5288 } 5289 #endif 5290 5291 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 5292 const char *dev_name, void *data) 5293 { 5294 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 5295 } 5296 5297 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 5298 static inline void register_as_ext2(void) 5299 { 5300 int err = register_filesystem(&ext2_fs_type); 5301 if (err) 5302 printk(KERN_WARNING 5303 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 5304 } 5305 5306 static inline void unregister_as_ext2(void) 5307 { 5308 unregister_filesystem(&ext2_fs_type); 5309 } 5310 5311 static inline int ext2_feature_set_ok(struct super_block *sb) 5312 { 5313 if (ext4_has_unknown_ext2_incompat_features(sb)) 5314 return 0; 5315 if (sb->s_flags & MS_RDONLY) 5316 return 1; 5317 if (ext4_has_unknown_ext2_ro_compat_features(sb)) 5318 return 0; 5319 return 1; 5320 } 5321 #else 5322 static inline void register_as_ext2(void) { } 5323 static inline void unregister_as_ext2(void) { } 5324 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 5325 #endif 5326 5327 static inline void register_as_ext3(void) 5328 { 5329 int err = register_filesystem(&ext3_fs_type); 5330 if (err) 5331 printk(KERN_WARNING 5332 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 5333 } 5334 5335 static inline void unregister_as_ext3(void) 5336 { 5337 unregister_filesystem(&ext3_fs_type); 5338 } 5339 5340 static inline int ext3_feature_set_ok(struct super_block *sb) 5341 { 5342 if (ext4_has_unknown_ext3_incompat_features(sb)) 5343 return 0; 5344 if (!ext4_has_feature_journal(sb)) 5345 return 0; 5346 if (sb->s_flags & MS_RDONLY) 5347 return 1; 5348 if (ext4_has_unknown_ext3_ro_compat_features(sb)) 5349 return 0; 5350 return 1; 5351 } 5352 5353 static struct file_system_type ext4_fs_type = { 5354 .owner = THIS_MODULE, 5355 .name = "ext4", 5356 .mount = ext4_mount, 5357 .kill_sb = kill_block_super, 5358 .fs_flags = FS_REQUIRES_DEV, 5359 }; 5360 MODULE_ALIAS_FS("ext4"); 5361 5362 /* Shared across all ext4 file systems */ 5363 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 5364 5365 static int __init ext4_init_fs(void) 5366 { 5367 int i, err; 5368 5369 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); 5370 ext4_li_info = NULL; 5371 mutex_init(&ext4_li_mtx); 5372 5373 /* Build-time check for flags consistency */ 5374 ext4_check_flag_values(); 5375 5376 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) 5377 init_waitqueue_head(&ext4__ioend_wq[i]); 5378 5379 err = ext4_init_es(); 5380 if (err) 5381 return err; 5382 5383 err = ext4_init_pageio(); 5384 if (err) 5385 goto out5; 5386 5387 err = ext4_init_system_zone(); 5388 if (err) 5389 goto out4; 5390 5391 err = ext4_init_sysfs(); 5392 if (err) 5393 goto out3; 5394 5395 err = ext4_init_mballoc(); 5396 if (err) 5397 goto out2; 5398 err = init_inodecache(); 5399 if (err) 5400 goto out1; 5401 register_as_ext3(); 5402 register_as_ext2(); 5403 err = register_filesystem(&ext4_fs_type); 5404 if (err) 5405 goto out; 5406 5407 return 0; 5408 out: 5409 unregister_as_ext2(); 5410 unregister_as_ext3(); 5411 destroy_inodecache(); 5412 out1: 5413 ext4_exit_mballoc(); 5414 out2: 5415 ext4_exit_sysfs(); 5416 out3: 5417 ext4_exit_system_zone(); 5418 out4: 5419 ext4_exit_pageio(); 5420 out5: 5421 ext4_exit_es(); 5422 5423 return err; 5424 } 5425 5426 static void __exit ext4_exit_fs(void) 5427 { 5428 ext4_exit_crypto(); 5429 ext4_destroy_lazyinit_thread(); 5430 unregister_as_ext2(); 5431 unregister_as_ext3(); 5432 unregister_filesystem(&ext4_fs_type); 5433 destroy_inodecache(); 5434 ext4_exit_mballoc(); 5435 ext4_exit_sysfs(); 5436 ext4_exit_system_zone(); 5437 ext4_exit_pageio(); 5438 ext4_exit_es(); 5439 } 5440 5441 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 5442 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5443 MODULE_LICENSE("GPL"); 5444 module_init(ext4_init_fs) 5445 module_exit(ext4_exit_fs) 5446