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/dax.h> 41 #include <linux/cleancache.h> 42 #include <linux/uaccess.h> 43 44 #include <linux/kthread.h> 45 #include <linux/freezer.h> 46 47 #include "ext4.h" 48 #include "ext4_extents.h" /* Needed for trace points definition */ 49 #include "ext4_jbd2.h" 50 #include "xattr.h" 51 #include "acl.h" 52 #include "mballoc.h" 53 #include "fsmap.h" 54 55 #define CREATE_TRACE_POINTS 56 #include <trace/events/ext4.h> 57 58 static struct ext4_lazy_init *ext4_li_info; 59 static struct mutex ext4_li_mtx; 60 static struct ratelimit_state ext4_mount_msg_ratelimit; 61 62 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 63 unsigned long journal_devnum); 64 static int ext4_show_options(struct seq_file *seq, struct dentry *root); 65 static int ext4_commit_super(struct super_block *sb, int sync); 66 static void ext4_mark_recovery_complete(struct super_block *sb, 67 struct ext4_super_block *es); 68 static void ext4_clear_journal_err(struct super_block *sb, 69 struct ext4_super_block *es); 70 static int ext4_sync_fs(struct super_block *sb, int wait); 71 static int ext4_remount(struct super_block *sb, int *flags, char *data); 72 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 73 static int ext4_unfreeze(struct super_block *sb); 74 static int ext4_freeze(struct super_block *sb); 75 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 76 const char *dev_name, void *data); 77 static inline int ext2_feature_set_ok(struct super_block *sb); 78 static inline int ext3_feature_set_ok(struct super_block *sb); 79 static int ext4_feature_set_ok(struct super_block *sb, int readonly); 80 static void ext4_destroy_lazyinit_thread(void); 81 static void ext4_unregister_li_request(struct super_block *sb); 82 static void ext4_clear_request_list(void); 83 static struct inode *ext4_get_journal_inode(struct super_block *sb, 84 unsigned int journal_inum); 85 86 /* 87 * Lock ordering 88 * 89 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and 90 * i_mmap_rwsem (inode->i_mmap_rwsem)! 91 * 92 * page fault path: 93 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start -> 94 * page lock -> i_data_sem (rw) 95 * 96 * buffered write path: 97 * sb_start_write -> i_mutex -> mmap_sem 98 * sb_start_write -> i_mutex -> transaction start -> page lock -> 99 * i_data_sem (rw) 100 * 101 * truncate: 102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> 103 * i_mmap_rwsem (w) -> page lock 104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) -> 105 * transaction start -> i_data_sem (rw) 106 * 107 * direct IO: 108 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem 109 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> 110 * transaction start -> i_data_sem (rw) 111 * 112 * writepages: 113 * transaction start -> page lock(s) -> i_data_sem (rw) 114 */ 115 116 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 117 static struct file_system_type ext2_fs_type = { 118 .owner = THIS_MODULE, 119 .name = "ext2", 120 .mount = ext4_mount, 121 .kill_sb = kill_block_super, 122 .fs_flags = FS_REQUIRES_DEV, 123 }; 124 MODULE_ALIAS_FS("ext2"); 125 MODULE_ALIAS("ext2"); 126 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 127 #else 128 #define IS_EXT2_SB(sb) (0) 129 #endif 130 131 132 static struct file_system_type ext3_fs_type = { 133 .owner = THIS_MODULE, 134 .name = "ext3", 135 .mount = ext4_mount, 136 .kill_sb = kill_block_super, 137 .fs_flags = FS_REQUIRES_DEV, 138 }; 139 MODULE_ALIAS_FS("ext3"); 140 MODULE_ALIAS("ext3"); 141 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 142 143 static int ext4_verify_csum_type(struct super_block *sb, 144 struct ext4_super_block *es) 145 { 146 if (!ext4_has_feature_metadata_csum(sb)) 147 return 1; 148 149 return es->s_checksum_type == EXT4_CRC32C_CHKSUM; 150 } 151 152 static __le32 ext4_superblock_csum(struct super_block *sb, 153 struct ext4_super_block *es) 154 { 155 struct ext4_sb_info *sbi = EXT4_SB(sb); 156 int offset = offsetof(struct ext4_super_block, s_checksum); 157 __u32 csum; 158 159 csum = ext4_chksum(sbi, ~0, (char *)es, offset); 160 161 return cpu_to_le32(csum); 162 } 163 164 static int ext4_superblock_csum_verify(struct super_block *sb, 165 struct ext4_super_block *es) 166 { 167 if (!ext4_has_metadata_csum(sb)) 168 return 1; 169 170 return es->s_checksum == ext4_superblock_csum(sb, es); 171 } 172 173 void ext4_superblock_csum_set(struct super_block *sb) 174 { 175 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 176 177 if (!ext4_has_metadata_csum(sb)) 178 return; 179 180 es->s_checksum = ext4_superblock_csum(sb, es); 181 } 182 183 void *ext4_kvmalloc(size_t size, gfp_t flags) 184 { 185 void *ret; 186 187 ret = kmalloc(size, flags | __GFP_NOWARN); 188 if (!ret) 189 ret = __vmalloc(size, flags, PAGE_KERNEL); 190 return ret; 191 } 192 193 void *ext4_kvzalloc(size_t size, gfp_t flags) 194 { 195 void *ret; 196 197 ret = kzalloc(size, flags | __GFP_NOWARN); 198 if (!ret) 199 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 200 return ret; 201 } 202 203 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 204 struct ext4_group_desc *bg) 205 { 206 return le32_to_cpu(bg->bg_block_bitmap_lo) | 207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 208 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 209 } 210 211 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 212 struct ext4_group_desc *bg) 213 { 214 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 216 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 217 } 218 219 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 220 struct ext4_group_desc *bg) 221 { 222 return le32_to_cpu(bg->bg_inode_table_lo) | 223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 224 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 225 } 226 227 __u32 ext4_free_group_clusters(struct super_block *sb, 228 struct ext4_group_desc *bg) 229 { 230 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 232 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 233 } 234 235 __u32 ext4_free_inodes_count(struct super_block *sb, 236 struct ext4_group_desc *bg) 237 { 238 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 240 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 241 } 242 243 __u32 ext4_used_dirs_count(struct super_block *sb, 244 struct ext4_group_desc *bg) 245 { 246 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 248 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 249 } 250 251 __u32 ext4_itable_unused_count(struct super_block *sb, 252 struct ext4_group_desc *bg) 253 { 254 return le16_to_cpu(bg->bg_itable_unused_lo) | 255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 256 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 257 } 258 259 void ext4_block_bitmap_set(struct super_block *sb, 260 struct ext4_group_desc *bg, ext4_fsblk_t blk) 261 { 262 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 264 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 265 } 266 267 void ext4_inode_bitmap_set(struct super_block *sb, 268 struct ext4_group_desc *bg, ext4_fsblk_t blk) 269 { 270 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 272 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 273 } 274 275 void ext4_inode_table_set(struct super_block *sb, 276 struct ext4_group_desc *bg, ext4_fsblk_t blk) 277 { 278 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 280 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 281 } 282 283 void ext4_free_group_clusters_set(struct super_block *sb, 284 struct ext4_group_desc *bg, __u32 count) 285 { 286 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 288 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 289 } 290 291 void ext4_free_inodes_set(struct super_block *sb, 292 struct ext4_group_desc *bg, __u32 count) 293 { 294 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 296 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 297 } 298 299 void ext4_used_dirs_set(struct super_block *sb, 300 struct ext4_group_desc *bg, __u32 count) 301 { 302 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 304 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 305 } 306 307 void ext4_itable_unused_set(struct super_block *sb, 308 struct ext4_group_desc *bg, __u32 count) 309 { 310 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 312 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 313 } 314 315 316 static void __save_error_info(struct super_block *sb, const char *func, 317 unsigned int line) 318 { 319 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 320 321 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 322 if (bdev_read_only(sb->s_bdev)) 323 return; 324 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 325 es->s_last_error_time = cpu_to_le32(get_seconds()); 326 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 327 es->s_last_error_line = cpu_to_le32(line); 328 if (!es->s_first_error_time) { 329 es->s_first_error_time = es->s_last_error_time; 330 strncpy(es->s_first_error_func, func, 331 sizeof(es->s_first_error_func)); 332 es->s_first_error_line = cpu_to_le32(line); 333 es->s_first_error_ino = es->s_last_error_ino; 334 es->s_first_error_block = es->s_last_error_block; 335 } 336 /* 337 * Start the daily error reporting function if it hasn't been 338 * started already 339 */ 340 if (!es->s_error_count) 341 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 342 le32_add_cpu(&es->s_error_count, 1); 343 } 344 345 static void save_error_info(struct super_block *sb, const char *func, 346 unsigned int line) 347 { 348 __save_error_info(sb, func, line); 349 ext4_commit_super(sb, 1); 350 } 351 352 /* 353 * The del_gendisk() function uninitializes the disk-specific data 354 * structures, including the bdi structure, without telling anyone 355 * else. Once this happens, any attempt to call mark_buffer_dirty() 356 * (for example, by ext4_commit_super), will cause a kernel OOPS. 357 * This is a kludge to prevent these oops until we can put in a proper 358 * hook in del_gendisk() to inform the VFS and file system layers. 359 */ 360 static int block_device_ejected(struct super_block *sb) 361 { 362 struct inode *bd_inode = sb->s_bdev->bd_inode; 363 struct backing_dev_info *bdi = inode_to_bdi(bd_inode); 364 365 return bdi->dev == NULL; 366 } 367 368 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 369 { 370 struct super_block *sb = journal->j_private; 371 struct ext4_sb_info *sbi = EXT4_SB(sb); 372 int error = is_journal_aborted(journal); 373 struct ext4_journal_cb_entry *jce; 374 375 BUG_ON(txn->t_state == T_FINISHED); 376 377 ext4_process_freed_data(sb, txn->t_tid); 378 379 spin_lock(&sbi->s_md_lock); 380 while (!list_empty(&txn->t_private_list)) { 381 jce = list_entry(txn->t_private_list.next, 382 struct ext4_journal_cb_entry, jce_list); 383 list_del_init(&jce->jce_list); 384 spin_unlock(&sbi->s_md_lock); 385 jce->jce_func(sb, jce, error); 386 spin_lock(&sbi->s_md_lock); 387 } 388 spin_unlock(&sbi->s_md_lock); 389 } 390 391 /* Deal with the reporting of failure conditions on a filesystem such as 392 * inconsistencies detected or read IO failures. 393 * 394 * On ext2, we can store the error state of the filesystem in the 395 * superblock. That is not possible on ext4, because we may have other 396 * write ordering constraints on the superblock which prevent us from 397 * writing it out straight away; and given that the journal is about to 398 * be aborted, we can't rely on the current, or future, transactions to 399 * write out the superblock safely. 400 * 401 * We'll just use the jbd2_journal_abort() error code to record an error in 402 * the journal instead. On recovery, the journal will complain about 403 * that error until we've noted it down and cleared it. 404 */ 405 406 static void ext4_handle_error(struct super_block *sb) 407 { 408 if (sb->s_flags & MS_RDONLY) 409 return; 410 411 if (!test_opt(sb, ERRORS_CONT)) { 412 journal_t *journal = EXT4_SB(sb)->s_journal; 413 414 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 415 if (journal) 416 jbd2_journal_abort(journal, -EIO); 417 } 418 if (test_opt(sb, ERRORS_RO)) { 419 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 420 /* 421 * Make sure updated value of ->s_mount_flags will be visible 422 * before ->s_flags update 423 */ 424 smp_wmb(); 425 sb->s_flags |= MS_RDONLY; 426 } 427 if (test_opt(sb, ERRORS_PANIC)) { 428 if (EXT4_SB(sb)->s_journal && 429 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) 430 return; 431 panic("EXT4-fs (device %s): panic forced after error\n", 432 sb->s_id); 433 } 434 } 435 436 #define ext4_error_ratelimit(sb) \ 437 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ 438 "EXT4-fs error") 439 440 void __ext4_error(struct super_block *sb, const char *function, 441 unsigned int line, const char *fmt, ...) 442 { 443 struct va_format vaf; 444 va_list args; 445 446 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 447 return; 448 449 if (ext4_error_ratelimit(sb)) { 450 va_start(args, fmt); 451 vaf.fmt = fmt; 452 vaf.va = &args; 453 printk(KERN_CRIT 454 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 455 sb->s_id, function, line, current->comm, &vaf); 456 va_end(args); 457 } 458 save_error_info(sb, function, line); 459 ext4_handle_error(sb); 460 } 461 462 void __ext4_error_inode(struct inode *inode, const char *function, 463 unsigned int line, ext4_fsblk_t block, 464 const char *fmt, ...) 465 { 466 va_list args; 467 struct va_format vaf; 468 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 469 470 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 471 return; 472 473 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 474 es->s_last_error_block = cpu_to_le64(block); 475 if (ext4_error_ratelimit(inode->i_sb)) { 476 va_start(args, fmt); 477 vaf.fmt = fmt; 478 vaf.va = &args; 479 if (block) 480 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 481 "inode #%lu: block %llu: comm %s: %pV\n", 482 inode->i_sb->s_id, function, line, inode->i_ino, 483 block, current->comm, &vaf); 484 else 485 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 486 "inode #%lu: comm %s: %pV\n", 487 inode->i_sb->s_id, function, line, inode->i_ino, 488 current->comm, &vaf); 489 va_end(args); 490 } 491 save_error_info(inode->i_sb, function, line); 492 ext4_handle_error(inode->i_sb); 493 } 494 495 void __ext4_error_file(struct file *file, const char *function, 496 unsigned int line, ext4_fsblk_t block, 497 const char *fmt, ...) 498 { 499 va_list args; 500 struct va_format vaf; 501 struct ext4_super_block *es; 502 struct inode *inode = file_inode(file); 503 char pathname[80], *path; 504 505 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 506 return; 507 508 es = EXT4_SB(inode->i_sb)->s_es; 509 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 510 if (ext4_error_ratelimit(inode->i_sb)) { 511 path = file_path(file, pathname, sizeof(pathname)); 512 if (IS_ERR(path)) 513 path = "(unknown)"; 514 va_start(args, fmt); 515 vaf.fmt = fmt; 516 vaf.va = &args; 517 if (block) 518 printk(KERN_CRIT 519 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 520 "block %llu: comm %s: path %s: %pV\n", 521 inode->i_sb->s_id, function, line, inode->i_ino, 522 block, current->comm, path, &vaf); 523 else 524 printk(KERN_CRIT 525 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 526 "comm %s: path %s: %pV\n", 527 inode->i_sb->s_id, function, line, inode->i_ino, 528 current->comm, path, &vaf); 529 va_end(args); 530 } 531 save_error_info(inode->i_sb, function, line); 532 ext4_handle_error(inode->i_sb); 533 } 534 535 const char *ext4_decode_error(struct super_block *sb, int errno, 536 char nbuf[16]) 537 { 538 char *errstr = NULL; 539 540 switch (errno) { 541 case -EFSCORRUPTED: 542 errstr = "Corrupt filesystem"; 543 break; 544 case -EFSBADCRC: 545 errstr = "Filesystem failed CRC"; 546 break; 547 case -EIO: 548 errstr = "IO failure"; 549 break; 550 case -ENOMEM: 551 errstr = "Out of memory"; 552 break; 553 case -EROFS: 554 if (!sb || (EXT4_SB(sb)->s_journal && 555 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 556 errstr = "Journal has aborted"; 557 else 558 errstr = "Readonly filesystem"; 559 break; 560 default: 561 /* If the caller passed in an extra buffer for unknown 562 * errors, textualise them now. Else we just return 563 * NULL. */ 564 if (nbuf) { 565 /* Check for truncated error codes... */ 566 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 567 errstr = nbuf; 568 } 569 break; 570 } 571 572 return errstr; 573 } 574 575 /* __ext4_std_error decodes expected errors from journaling functions 576 * automatically and invokes the appropriate error response. */ 577 578 void __ext4_std_error(struct super_block *sb, const char *function, 579 unsigned int line, int errno) 580 { 581 char nbuf[16]; 582 const char *errstr; 583 584 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 585 return; 586 587 /* Special case: if the error is EROFS, and we're not already 588 * inside a transaction, then there's really no point in logging 589 * an error. */ 590 if (errno == -EROFS && journal_current_handle() == NULL && 591 (sb->s_flags & MS_RDONLY)) 592 return; 593 594 if (ext4_error_ratelimit(sb)) { 595 errstr = ext4_decode_error(sb, errno, nbuf); 596 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 597 sb->s_id, function, line, errstr); 598 } 599 600 save_error_info(sb, function, line); 601 ext4_handle_error(sb); 602 } 603 604 /* 605 * ext4_abort is a much stronger failure handler than ext4_error. The 606 * abort function may be used to deal with unrecoverable failures such 607 * as journal IO errors or ENOMEM at a critical moment in log management. 608 * 609 * We unconditionally force the filesystem into an ABORT|READONLY state, 610 * unless the error response on the fs has been set to panic in which 611 * case we take the easy way out and panic immediately. 612 */ 613 614 void __ext4_abort(struct super_block *sb, const char *function, 615 unsigned int line, const char *fmt, ...) 616 { 617 struct va_format vaf; 618 va_list args; 619 620 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 621 return; 622 623 save_error_info(sb, function, line); 624 va_start(args, fmt); 625 vaf.fmt = fmt; 626 vaf.va = &args; 627 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n", 628 sb->s_id, function, line, &vaf); 629 va_end(args); 630 631 if ((sb->s_flags & MS_RDONLY) == 0) { 632 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 633 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 634 /* 635 * Make sure updated value of ->s_mount_flags will be visible 636 * before ->s_flags update 637 */ 638 smp_wmb(); 639 sb->s_flags |= MS_RDONLY; 640 if (EXT4_SB(sb)->s_journal) 641 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 642 save_error_info(sb, function, line); 643 } 644 if (test_opt(sb, ERRORS_PANIC)) { 645 if (EXT4_SB(sb)->s_journal && 646 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) 647 return; 648 panic("EXT4-fs panic from previous error\n"); 649 } 650 } 651 652 void __ext4_msg(struct super_block *sb, 653 const char *prefix, const char *fmt, ...) 654 { 655 struct va_format vaf; 656 va_list args; 657 658 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs")) 659 return; 660 661 va_start(args, fmt); 662 vaf.fmt = fmt; 663 vaf.va = &args; 664 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 665 va_end(args); 666 } 667 668 #define ext4_warning_ratelimit(sb) \ 669 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \ 670 "EXT4-fs warning") 671 672 void __ext4_warning(struct super_block *sb, const char *function, 673 unsigned int line, const char *fmt, ...) 674 { 675 struct va_format vaf; 676 va_list args; 677 678 if (!ext4_warning_ratelimit(sb)) 679 return; 680 681 va_start(args, fmt); 682 vaf.fmt = fmt; 683 vaf.va = &args; 684 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 685 sb->s_id, function, line, &vaf); 686 va_end(args); 687 } 688 689 void __ext4_warning_inode(const struct inode *inode, const char *function, 690 unsigned int line, const char *fmt, ...) 691 { 692 struct va_format vaf; 693 va_list args; 694 695 if (!ext4_warning_ratelimit(inode->i_sb)) 696 return; 697 698 va_start(args, fmt); 699 vaf.fmt = fmt; 700 vaf.va = &args; 701 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " 702 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id, 703 function, line, inode->i_ino, current->comm, &vaf); 704 va_end(args); 705 } 706 707 void __ext4_grp_locked_error(const char *function, unsigned int line, 708 struct super_block *sb, ext4_group_t grp, 709 unsigned long ino, ext4_fsblk_t block, 710 const char *fmt, ...) 711 __releases(bitlock) 712 __acquires(bitlock) 713 { 714 struct va_format vaf; 715 va_list args; 716 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 717 718 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 719 return; 720 721 es->s_last_error_ino = cpu_to_le32(ino); 722 es->s_last_error_block = cpu_to_le64(block); 723 __save_error_info(sb, function, line); 724 725 if (ext4_error_ratelimit(sb)) { 726 va_start(args, fmt); 727 vaf.fmt = fmt; 728 vaf.va = &args; 729 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 730 sb->s_id, function, line, grp); 731 if (ino) 732 printk(KERN_CONT "inode %lu: ", ino); 733 if (block) 734 printk(KERN_CONT "block %llu:", 735 (unsigned long long) block); 736 printk(KERN_CONT "%pV\n", &vaf); 737 va_end(args); 738 } 739 740 if (test_opt(sb, ERRORS_CONT)) { 741 ext4_commit_super(sb, 0); 742 return; 743 } 744 745 ext4_unlock_group(sb, grp); 746 ext4_handle_error(sb); 747 /* 748 * We only get here in the ERRORS_RO case; relocking the group 749 * may be dangerous, but nothing bad will happen since the 750 * filesystem will have already been marked read/only and the 751 * journal has been aborted. We return 1 as a hint to callers 752 * who might what to use the return value from 753 * ext4_grp_locked_error() to distinguish between the 754 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 755 * aggressively from the ext4 function in question, with a 756 * more appropriate error code. 757 */ 758 ext4_lock_group(sb, grp); 759 return; 760 } 761 762 void ext4_update_dynamic_rev(struct super_block *sb) 763 { 764 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 765 766 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 767 return; 768 769 ext4_warning(sb, 770 "updating to rev %d because of new feature flag, " 771 "running e2fsck is recommended", 772 EXT4_DYNAMIC_REV); 773 774 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 775 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 776 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 777 /* leave es->s_feature_*compat flags alone */ 778 /* es->s_uuid will be set by e2fsck if empty */ 779 780 /* 781 * The rest of the superblock fields should be zero, and if not it 782 * means they are likely already in use, so leave them alone. We 783 * can leave it up to e2fsck to clean up any inconsistencies there. 784 */ 785 } 786 787 /* 788 * Open the external journal device 789 */ 790 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 791 { 792 struct block_device *bdev; 793 char b[BDEVNAME_SIZE]; 794 795 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 796 if (IS_ERR(bdev)) 797 goto fail; 798 return bdev; 799 800 fail: 801 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 802 __bdevname(dev, b), PTR_ERR(bdev)); 803 return NULL; 804 } 805 806 /* 807 * Release the journal device 808 */ 809 static void ext4_blkdev_put(struct block_device *bdev) 810 { 811 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 812 } 813 814 static void ext4_blkdev_remove(struct ext4_sb_info *sbi) 815 { 816 struct block_device *bdev; 817 bdev = sbi->journal_bdev; 818 if (bdev) { 819 ext4_blkdev_put(bdev); 820 sbi->journal_bdev = NULL; 821 } 822 } 823 824 static inline struct inode *orphan_list_entry(struct list_head *l) 825 { 826 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 827 } 828 829 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 830 { 831 struct list_head *l; 832 833 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 834 le32_to_cpu(sbi->s_es->s_last_orphan)); 835 836 printk(KERN_ERR "sb_info orphan list:\n"); 837 list_for_each(l, &sbi->s_orphan) { 838 struct inode *inode = orphan_list_entry(l); 839 printk(KERN_ERR " " 840 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 841 inode->i_sb->s_id, inode->i_ino, inode, 842 inode->i_mode, inode->i_nlink, 843 NEXT_ORPHAN(inode)); 844 } 845 } 846 847 #ifdef CONFIG_QUOTA 848 static int ext4_quota_off(struct super_block *sb, int type); 849 850 static inline void ext4_quota_off_umount(struct super_block *sb) 851 { 852 int type; 853 854 /* Use our quota_off function to clear inode flags etc. */ 855 for (type = 0; type < EXT4_MAXQUOTAS; type++) 856 ext4_quota_off(sb, type); 857 } 858 #else 859 static inline void ext4_quota_off_umount(struct super_block *sb) 860 { 861 } 862 #endif 863 864 static void ext4_put_super(struct super_block *sb) 865 { 866 struct ext4_sb_info *sbi = EXT4_SB(sb); 867 struct ext4_super_block *es = sbi->s_es; 868 int aborted = 0; 869 int i, err; 870 871 ext4_unregister_li_request(sb); 872 ext4_quota_off_umount(sb); 873 874 flush_workqueue(sbi->rsv_conversion_wq); 875 destroy_workqueue(sbi->rsv_conversion_wq); 876 877 if (sbi->s_journal) { 878 aborted = is_journal_aborted(sbi->s_journal); 879 err = jbd2_journal_destroy(sbi->s_journal); 880 sbi->s_journal = NULL; 881 if ((err < 0) && !aborted) 882 ext4_abort(sb, "Couldn't clean up the journal"); 883 } 884 885 ext4_unregister_sysfs(sb); 886 ext4_es_unregister_shrinker(sbi); 887 del_timer_sync(&sbi->s_err_report); 888 ext4_release_system_zone(sb); 889 ext4_mb_release(sb); 890 ext4_ext_release(sb); 891 892 if (!(sb->s_flags & MS_RDONLY) && !aborted) { 893 ext4_clear_feature_journal_needs_recovery(sb); 894 es->s_state = cpu_to_le16(sbi->s_mount_state); 895 } 896 if (!(sb->s_flags & MS_RDONLY)) 897 ext4_commit_super(sb, 1); 898 899 for (i = 0; i < sbi->s_gdb_count; i++) 900 brelse(sbi->s_group_desc[i]); 901 kvfree(sbi->s_group_desc); 902 kvfree(sbi->s_flex_groups); 903 percpu_counter_destroy(&sbi->s_freeclusters_counter); 904 percpu_counter_destroy(&sbi->s_freeinodes_counter); 905 percpu_counter_destroy(&sbi->s_dirs_counter); 906 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 907 percpu_free_rwsem(&sbi->s_journal_flag_rwsem); 908 #ifdef CONFIG_QUOTA 909 for (i = 0; i < EXT4_MAXQUOTAS; i++) 910 kfree(sbi->s_qf_names[i]); 911 #endif 912 913 /* Debugging code just in case the in-memory inode orphan list 914 * isn't empty. The on-disk one can be non-empty if we've 915 * detected an error and taken the fs readonly, but the 916 * in-memory list had better be clean by this point. */ 917 if (!list_empty(&sbi->s_orphan)) 918 dump_orphan_list(sb, sbi); 919 J_ASSERT(list_empty(&sbi->s_orphan)); 920 921 sync_blockdev(sb->s_bdev); 922 invalidate_bdev(sb->s_bdev); 923 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 924 /* 925 * Invalidate the journal device's buffers. We don't want them 926 * floating about in memory - the physical journal device may 927 * hotswapped, and it breaks the `ro-after' testing code. 928 */ 929 sync_blockdev(sbi->journal_bdev); 930 invalidate_bdev(sbi->journal_bdev); 931 ext4_blkdev_remove(sbi); 932 } 933 if (sbi->s_ea_inode_cache) { 934 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); 935 sbi->s_ea_inode_cache = NULL; 936 } 937 if (sbi->s_ea_block_cache) { 938 ext4_xattr_destroy_cache(sbi->s_ea_block_cache); 939 sbi->s_ea_block_cache = NULL; 940 } 941 if (sbi->s_mmp_tsk) 942 kthread_stop(sbi->s_mmp_tsk); 943 brelse(sbi->s_sbh); 944 sb->s_fs_info = NULL; 945 /* 946 * Now that we are completely done shutting down the 947 * superblock, we need to actually destroy the kobject. 948 */ 949 kobject_put(&sbi->s_kobj); 950 wait_for_completion(&sbi->s_kobj_unregister); 951 if (sbi->s_chksum_driver) 952 crypto_free_shash(sbi->s_chksum_driver); 953 kfree(sbi->s_blockgroup_lock); 954 kfree(sbi); 955 } 956 957 static struct kmem_cache *ext4_inode_cachep; 958 959 /* 960 * Called inside transaction, so use GFP_NOFS 961 */ 962 static struct inode *ext4_alloc_inode(struct super_block *sb) 963 { 964 struct ext4_inode_info *ei; 965 966 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 967 if (!ei) 968 return NULL; 969 970 ei->vfs_inode.i_version = 1; 971 spin_lock_init(&ei->i_raw_lock); 972 INIT_LIST_HEAD(&ei->i_prealloc_list); 973 spin_lock_init(&ei->i_prealloc_lock); 974 ext4_es_init_tree(&ei->i_es_tree); 975 rwlock_init(&ei->i_es_lock); 976 INIT_LIST_HEAD(&ei->i_es_list); 977 ei->i_es_all_nr = 0; 978 ei->i_es_shk_nr = 0; 979 ei->i_es_shrink_lblk = 0; 980 ei->i_reserved_data_blocks = 0; 981 ei->i_reserved_meta_blocks = 0; 982 ei->i_allocated_meta_blocks = 0; 983 ei->i_da_metadata_calc_len = 0; 984 ei->i_da_metadata_calc_last_lblock = 0; 985 spin_lock_init(&(ei->i_block_reservation_lock)); 986 #ifdef CONFIG_QUOTA 987 ei->i_reserved_quota = 0; 988 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 989 #endif 990 ei->jinode = NULL; 991 INIT_LIST_HEAD(&ei->i_rsv_conversion_list); 992 spin_lock_init(&ei->i_completed_io_lock); 993 ei->i_sync_tid = 0; 994 ei->i_datasync_tid = 0; 995 atomic_set(&ei->i_unwritten, 0); 996 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); 997 return &ei->vfs_inode; 998 } 999 1000 static int ext4_drop_inode(struct inode *inode) 1001 { 1002 int drop = generic_drop_inode(inode); 1003 1004 trace_ext4_drop_inode(inode, drop); 1005 return drop; 1006 } 1007 1008 static void ext4_i_callback(struct rcu_head *head) 1009 { 1010 struct inode *inode = container_of(head, struct inode, i_rcu); 1011 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 1012 } 1013 1014 static void ext4_destroy_inode(struct inode *inode) 1015 { 1016 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 1017 ext4_msg(inode->i_sb, KERN_ERR, 1018 "Inode %lu (%p): orphan list check failed!", 1019 inode->i_ino, EXT4_I(inode)); 1020 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 1021 EXT4_I(inode), sizeof(struct ext4_inode_info), 1022 true); 1023 dump_stack(); 1024 } 1025 call_rcu(&inode->i_rcu, ext4_i_callback); 1026 } 1027 1028 static void init_once(void *foo) 1029 { 1030 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 1031 1032 INIT_LIST_HEAD(&ei->i_orphan); 1033 init_rwsem(&ei->xattr_sem); 1034 init_rwsem(&ei->i_data_sem); 1035 init_rwsem(&ei->i_mmap_sem); 1036 inode_init_once(&ei->vfs_inode); 1037 } 1038 1039 static int __init init_inodecache(void) 1040 { 1041 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 1042 sizeof(struct ext4_inode_info), 1043 0, (SLAB_RECLAIM_ACCOUNT| 1044 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 1045 init_once); 1046 if (ext4_inode_cachep == NULL) 1047 return -ENOMEM; 1048 return 0; 1049 } 1050 1051 static void destroy_inodecache(void) 1052 { 1053 /* 1054 * Make sure all delayed rcu free inodes are flushed before we 1055 * destroy cache. 1056 */ 1057 rcu_barrier(); 1058 kmem_cache_destroy(ext4_inode_cachep); 1059 } 1060 1061 void ext4_clear_inode(struct inode *inode) 1062 { 1063 invalidate_inode_buffers(inode); 1064 clear_inode(inode); 1065 dquot_drop(inode); 1066 ext4_discard_preallocations(inode); 1067 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); 1068 if (EXT4_I(inode)->jinode) { 1069 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 1070 EXT4_I(inode)->jinode); 1071 jbd2_free_inode(EXT4_I(inode)->jinode); 1072 EXT4_I(inode)->jinode = NULL; 1073 } 1074 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1075 fscrypt_put_encryption_info(inode, NULL); 1076 #endif 1077 } 1078 1079 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1080 u64 ino, u32 generation) 1081 { 1082 struct inode *inode; 1083 1084 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1085 return ERR_PTR(-ESTALE); 1086 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1087 return ERR_PTR(-ESTALE); 1088 1089 /* iget isn't really right if the inode is currently unallocated!! 1090 * 1091 * ext4_read_inode will return a bad_inode if the inode had been 1092 * deleted, so we should be safe. 1093 * 1094 * Currently we don't know the generation for parent directory, so 1095 * a generation of 0 means "accept any" 1096 */ 1097 inode = ext4_iget_normal(sb, ino); 1098 if (IS_ERR(inode)) 1099 return ERR_CAST(inode); 1100 if (generation && inode->i_generation != generation) { 1101 iput(inode); 1102 return ERR_PTR(-ESTALE); 1103 } 1104 1105 return inode; 1106 } 1107 1108 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1109 int fh_len, int fh_type) 1110 { 1111 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1112 ext4_nfs_get_inode); 1113 } 1114 1115 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1116 int fh_len, int fh_type) 1117 { 1118 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1119 ext4_nfs_get_inode); 1120 } 1121 1122 /* 1123 * Try to release metadata pages (indirect blocks, directories) which are 1124 * mapped via the block device. Since these pages could have journal heads 1125 * which would prevent try_to_free_buffers() from freeing them, we must use 1126 * jbd2 layer's try_to_free_buffers() function to release them. 1127 */ 1128 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1129 gfp_t wait) 1130 { 1131 journal_t *journal = EXT4_SB(sb)->s_journal; 1132 1133 WARN_ON(PageChecked(page)); 1134 if (!page_has_buffers(page)) 1135 return 0; 1136 if (journal) 1137 return jbd2_journal_try_to_free_buffers(journal, page, 1138 wait & ~__GFP_DIRECT_RECLAIM); 1139 return try_to_free_buffers(page); 1140 } 1141 1142 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1143 static int ext4_get_context(struct inode *inode, void *ctx, size_t len) 1144 { 1145 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION, 1146 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len); 1147 } 1148 1149 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len, 1150 void *fs_data) 1151 { 1152 handle_t *handle = fs_data; 1153 int res, res2, credits, retries = 0; 1154 1155 /* 1156 * Encrypting the root directory is not allowed because e2fsck expects 1157 * lost+found to exist and be unencrypted, and encrypting the root 1158 * directory would imply encrypting the lost+found directory as well as 1159 * the filename "lost+found" itself. 1160 */ 1161 if (inode->i_ino == EXT4_ROOT_INO) 1162 return -EPERM; 1163 1164 res = ext4_convert_inline_data(inode); 1165 if (res) 1166 return res; 1167 1168 /* 1169 * If a journal handle was specified, then the encryption context is 1170 * being set on a new inode via inheritance and is part of a larger 1171 * transaction to create the inode. Otherwise the encryption context is 1172 * being set on an existing inode in its own transaction. Only in the 1173 * latter case should the "retry on ENOSPC" logic be used. 1174 */ 1175 1176 if (handle) { 1177 res = ext4_xattr_set_handle(handle, inode, 1178 EXT4_XATTR_INDEX_ENCRYPTION, 1179 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, 1180 ctx, len, 0); 1181 if (!res) { 1182 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT); 1183 ext4_clear_inode_state(inode, 1184 EXT4_STATE_MAY_INLINE_DATA); 1185 /* 1186 * Update inode->i_flags - e.g. S_DAX may get disabled 1187 */ 1188 ext4_set_inode_flags(inode); 1189 } 1190 return res; 1191 } 1192 1193 res = dquot_initialize(inode); 1194 if (res) 1195 return res; 1196 retry: 1197 res = ext4_xattr_set_credits(inode, len, false /* is_create */, 1198 &credits); 1199 if (res) 1200 return res; 1201 1202 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits); 1203 if (IS_ERR(handle)) 1204 return PTR_ERR(handle); 1205 1206 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION, 1207 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, 1208 ctx, len, 0); 1209 if (!res) { 1210 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT); 1211 /* Update inode->i_flags - e.g. S_DAX may get disabled */ 1212 ext4_set_inode_flags(inode); 1213 res = ext4_mark_inode_dirty(handle, inode); 1214 if (res) 1215 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty"); 1216 } 1217 res2 = ext4_journal_stop(handle); 1218 1219 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) 1220 goto retry; 1221 if (!res) 1222 res = res2; 1223 return res; 1224 } 1225 1226 static bool ext4_dummy_context(struct inode *inode) 1227 { 1228 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb)); 1229 } 1230 1231 static unsigned ext4_max_namelen(struct inode *inode) 1232 { 1233 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize : 1234 EXT4_NAME_LEN; 1235 } 1236 1237 static const struct fscrypt_operations ext4_cryptops = { 1238 .key_prefix = "ext4:", 1239 .get_context = ext4_get_context, 1240 .set_context = ext4_set_context, 1241 .dummy_context = ext4_dummy_context, 1242 .is_encrypted = ext4_encrypted_inode, 1243 .empty_dir = ext4_empty_dir, 1244 .max_namelen = ext4_max_namelen, 1245 }; 1246 #else 1247 static const struct fscrypt_operations ext4_cryptops = { 1248 .is_encrypted = ext4_encrypted_inode, 1249 }; 1250 #endif 1251 1252 #ifdef CONFIG_QUOTA 1253 static const char * const quotatypes[] = INITQFNAMES; 1254 #define QTYPE2NAME(t) (quotatypes[t]) 1255 1256 static int ext4_write_dquot(struct dquot *dquot); 1257 static int ext4_acquire_dquot(struct dquot *dquot); 1258 static int ext4_release_dquot(struct dquot *dquot); 1259 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1260 static int ext4_write_info(struct super_block *sb, int type); 1261 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1262 const struct path *path); 1263 static int ext4_quota_on_mount(struct super_block *sb, int type); 1264 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1265 size_t len, loff_t off); 1266 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1267 const char *data, size_t len, loff_t off); 1268 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 1269 unsigned int flags); 1270 static int ext4_enable_quotas(struct super_block *sb); 1271 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid); 1272 1273 static struct dquot **ext4_get_dquots(struct inode *inode) 1274 { 1275 return EXT4_I(inode)->i_dquot; 1276 } 1277 1278 static const struct dquot_operations ext4_quota_operations = { 1279 .get_reserved_space = ext4_get_reserved_space, 1280 .write_dquot = ext4_write_dquot, 1281 .acquire_dquot = ext4_acquire_dquot, 1282 .release_dquot = ext4_release_dquot, 1283 .mark_dirty = ext4_mark_dquot_dirty, 1284 .write_info = ext4_write_info, 1285 .alloc_dquot = dquot_alloc, 1286 .destroy_dquot = dquot_destroy, 1287 .get_projid = ext4_get_projid, 1288 .get_inode_usage = ext4_get_inode_usage, 1289 .get_next_id = ext4_get_next_id, 1290 }; 1291 1292 static const struct quotactl_ops ext4_qctl_operations = { 1293 .quota_on = ext4_quota_on, 1294 .quota_off = ext4_quota_off, 1295 .quota_sync = dquot_quota_sync, 1296 .get_state = dquot_get_state, 1297 .set_info = dquot_set_dqinfo, 1298 .get_dqblk = dquot_get_dqblk, 1299 .set_dqblk = dquot_set_dqblk, 1300 .get_nextdqblk = dquot_get_next_dqblk, 1301 }; 1302 #endif 1303 1304 static const struct super_operations ext4_sops = { 1305 .alloc_inode = ext4_alloc_inode, 1306 .destroy_inode = ext4_destroy_inode, 1307 .write_inode = ext4_write_inode, 1308 .dirty_inode = ext4_dirty_inode, 1309 .drop_inode = ext4_drop_inode, 1310 .evict_inode = ext4_evict_inode, 1311 .put_super = ext4_put_super, 1312 .sync_fs = ext4_sync_fs, 1313 .freeze_fs = ext4_freeze, 1314 .unfreeze_fs = ext4_unfreeze, 1315 .statfs = ext4_statfs, 1316 .remount_fs = ext4_remount, 1317 .show_options = ext4_show_options, 1318 #ifdef CONFIG_QUOTA 1319 .quota_read = ext4_quota_read, 1320 .quota_write = ext4_quota_write, 1321 .get_dquots = ext4_get_dquots, 1322 #endif 1323 .bdev_try_to_free_page = bdev_try_to_free_page, 1324 }; 1325 1326 static const struct export_operations ext4_export_ops = { 1327 .fh_to_dentry = ext4_fh_to_dentry, 1328 .fh_to_parent = ext4_fh_to_parent, 1329 .get_parent = ext4_get_parent, 1330 }; 1331 1332 enum { 1333 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1334 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1335 Opt_nouid32, Opt_debug, Opt_removed, 1336 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1337 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 1338 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, 1339 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, 1340 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1341 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, 1342 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1343 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1344 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1345 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax, 1346 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 1347 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize, 1348 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1349 Opt_inode_readahead_blks, Opt_journal_ioprio, 1350 Opt_dioread_nolock, Opt_dioread_lock, 1351 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1352 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache, 1353 }; 1354 1355 static const match_table_t tokens = { 1356 {Opt_bsd_df, "bsddf"}, 1357 {Opt_minix_df, "minixdf"}, 1358 {Opt_grpid, "grpid"}, 1359 {Opt_grpid, "bsdgroups"}, 1360 {Opt_nogrpid, "nogrpid"}, 1361 {Opt_nogrpid, "sysvgroups"}, 1362 {Opt_resgid, "resgid=%u"}, 1363 {Opt_resuid, "resuid=%u"}, 1364 {Opt_sb, "sb=%u"}, 1365 {Opt_err_cont, "errors=continue"}, 1366 {Opt_err_panic, "errors=panic"}, 1367 {Opt_err_ro, "errors=remount-ro"}, 1368 {Opt_nouid32, "nouid32"}, 1369 {Opt_debug, "debug"}, 1370 {Opt_removed, "oldalloc"}, 1371 {Opt_removed, "orlov"}, 1372 {Opt_user_xattr, "user_xattr"}, 1373 {Opt_nouser_xattr, "nouser_xattr"}, 1374 {Opt_acl, "acl"}, 1375 {Opt_noacl, "noacl"}, 1376 {Opt_noload, "norecovery"}, 1377 {Opt_noload, "noload"}, 1378 {Opt_removed, "nobh"}, 1379 {Opt_removed, "bh"}, 1380 {Opt_commit, "commit=%u"}, 1381 {Opt_min_batch_time, "min_batch_time=%u"}, 1382 {Opt_max_batch_time, "max_batch_time=%u"}, 1383 {Opt_journal_dev, "journal_dev=%u"}, 1384 {Opt_journal_path, "journal_path=%s"}, 1385 {Opt_journal_checksum, "journal_checksum"}, 1386 {Opt_nojournal_checksum, "nojournal_checksum"}, 1387 {Opt_journal_async_commit, "journal_async_commit"}, 1388 {Opt_abort, "abort"}, 1389 {Opt_data_journal, "data=journal"}, 1390 {Opt_data_ordered, "data=ordered"}, 1391 {Opt_data_writeback, "data=writeback"}, 1392 {Opt_data_err_abort, "data_err=abort"}, 1393 {Opt_data_err_ignore, "data_err=ignore"}, 1394 {Opt_offusrjquota, "usrjquota="}, 1395 {Opt_usrjquota, "usrjquota=%s"}, 1396 {Opt_offgrpjquota, "grpjquota="}, 1397 {Opt_grpjquota, "grpjquota=%s"}, 1398 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1399 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1400 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1401 {Opt_grpquota, "grpquota"}, 1402 {Opt_noquota, "noquota"}, 1403 {Opt_quota, "quota"}, 1404 {Opt_usrquota, "usrquota"}, 1405 {Opt_prjquota, "prjquota"}, 1406 {Opt_barrier, "barrier=%u"}, 1407 {Opt_barrier, "barrier"}, 1408 {Opt_nobarrier, "nobarrier"}, 1409 {Opt_i_version, "i_version"}, 1410 {Opt_dax, "dax"}, 1411 {Opt_stripe, "stripe=%u"}, 1412 {Opt_delalloc, "delalloc"}, 1413 {Opt_lazytime, "lazytime"}, 1414 {Opt_nolazytime, "nolazytime"}, 1415 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"}, 1416 {Opt_nodelalloc, "nodelalloc"}, 1417 {Opt_removed, "mblk_io_submit"}, 1418 {Opt_removed, "nomblk_io_submit"}, 1419 {Opt_block_validity, "block_validity"}, 1420 {Opt_noblock_validity, "noblock_validity"}, 1421 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1422 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1423 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1424 {Opt_auto_da_alloc, "auto_da_alloc"}, 1425 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1426 {Opt_dioread_nolock, "dioread_nolock"}, 1427 {Opt_dioread_lock, "dioread_lock"}, 1428 {Opt_discard, "discard"}, 1429 {Opt_nodiscard, "nodiscard"}, 1430 {Opt_init_itable, "init_itable=%u"}, 1431 {Opt_init_itable, "init_itable"}, 1432 {Opt_noinit_itable, "noinit_itable"}, 1433 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, 1434 {Opt_test_dummy_encryption, "test_dummy_encryption"}, 1435 {Opt_nombcache, "nombcache"}, 1436 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */ 1437 {Opt_removed, "check=none"}, /* mount option from ext2/3 */ 1438 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ 1439 {Opt_removed, "reservation"}, /* mount option from ext2/3 */ 1440 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ 1441 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ 1442 {Opt_err, NULL}, 1443 }; 1444 1445 static ext4_fsblk_t get_sb_block(void **data) 1446 { 1447 ext4_fsblk_t sb_block; 1448 char *options = (char *) *data; 1449 1450 if (!options || strncmp(options, "sb=", 3) != 0) 1451 return 1; /* Default location */ 1452 1453 options += 3; 1454 /* TODO: use simple_strtoll with >32bit ext4 */ 1455 sb_block = simple_strtoul(options, &options, 0); 1456 if (*options && *options != ',') { 1457 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1458 (char *) *data); 1459 return 1; 1460 } 1461 if (*options == ',') 1462 options++; 1463 *data = (void *) options; 1464 1465 return sb_block; 1466 } 1467 1468 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1469 static const char deprecated_msg[] = 1470 "Mount option \"%s\" will be removed by %s\n" 1471 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1472 1473 #ifdef CONFIG_QUOTA 1474 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1475 { 1476 struct ext4_sb_info *sbi = EXT4_SB(sb); 1477 char *qname; 1478 int ret = -1; 1479 1480 if (sb_any_quota_loaded(sb) && 1481 !sbi->s_qf_names[qtype]) { 1482 ext4_msg(sb, KERN_ERR, 1483 "Cannot change journaled " 1484 "quota options when quota turned on"); 1485 return -1; 1486 } 1487 if (ext4_has_feature_quota(sb)) { 1488 ext4_msg(sb, KERN_INFO, "Journaled quota options " 1489 "ignored when QUOTA feature is enabled"); 1490 return 1; 1491 } 1492 qname = match_strdup(args); 1493 if (!qname) { 1494 ext4_msg(sb, KERN_ERR, 1495 "Not enough memory for storing quotafile name"); 1496 return -1; 1497 } 1498 if (sbi->s_qf_names[qtype]) { 1499 if (strcmp(sbi->s_qf_names[qtype], qname) == 0) 1500 ret = 1; 1501 else 1502 ext4_msg(sb, KERN_ERR, 1503 "%s quota file already specified", 1504 QTYPE2NAME(qtype)); 1505 goto errout; 1506 } 1507 if (strchr(qname, '/')) { 1508 ext4_msg(sb, KERN_ERR, 1509 "quotafile must be on filesystem root"); 1510 goto errout; 1511 } 1512 sbi->s_qf_names[qtype] = qname; 1513 set_opt(sb, QUOTA); 1514 return 1; 1515 errout: 1516 kfree(qname); 1517 return ret; 1518 } 1519 1520 static int clear_qf_name(struct super_block *sb, int qtype) 1521 { 1522 1523 struct ext4_sb_info *sbi = EXT4_SB(sb); 1524 1525 if (sb_any_quota_loaded(sb) && 1526 sbi->s_qf_names[qtype]) { 1527 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1528 " when quota turned on"); 1529 return -1; 1530 } 1531 kfree(sbi->s_qf_names[qtype]); 1532 sbi->s_qf_names[qtype] = NULL; 1533 return 1; 1534 } 1535 #endif 1536 1537 #define MOPT_SET 0x0001 1538 #define MOPT_CLEAR 0x0002 1539 #define MOPT_NOSUPPORT 0x0004 1540 #define MOPT_EXPLICIT 0x0008 1541 #define MOPT_CLEAR_ERR 0x0010 1542 #define MOPT_GTE0 0x0020 1543 #ifdef CONFIG_QUOTA 1544 #define MOPT_Q 0 1545 #define MOPT_QFMT 0x0040 1546 #else 1547 #define MOPT_Q MOPT_NOSUPPORT 1548 #define MOPT_QFMT MOPT_NOSUPPORT 1549 #endif 1550 #define MOPT_DATAJ 0x0080 1551 #define MOPT_NO_EXT2 0x0100 1552 #define MOPT_NO_EXT3 0x0200 1553 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) 1554 #define MOPT_STRING 0x0400 1555 1556 static const struct mount_opts { 1557 int token; 1558 int mount_opt; 1559 int flags; 1560 } ext4_mount_opts[] = { 1561 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, 1562 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, 1563 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, 1564 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, 1565 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, 1566 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, 1567 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, 1568 MOPT_EXT4_ONLY | MOPT_SET}, 1569 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, 1570 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1571 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, 1572 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, 1573 {Opt_delalloc, EXT4_MOUNT_DELALLOC, 1574 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1575 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, 1576 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1577 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1578 MOPT_EXT4_ONLY | MOPT_CLEAR}, 1579 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, 1580 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1581 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | 1582 EXT4_MOUNT_JOURNAL_CHECKSUM), 1583 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, 1584 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, 1585 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, 1586 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, 1587 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, 1588 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, 1589 MOPT_NO_EXT2}, 1590 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, 1591 MOPT_NO_EXT2}, 1592 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, 1593 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, 1594 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, 1595 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, 1596 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, 1597 {Opt_commit, 0, MOPT_GTE0}, 1598 {Opt_max_batch_time, 0, MOPT_GTE0}, 1599 {Opt_min_batch_time, 0, MOPT_GTE0}, 1600 {Opt_inode_readahead_blks, 0, MOPT_GTE0}, 1601 {Opt_init_itable, 0, MOPT_GTE0}, 1602 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, 1603 {Opt_stripe, 0, MOPT_GTE0}, 1604 {Opt_resuid, 0, MOPT_GTE0}, 1605 {Opt_resgid, 0, MOPT_GTE0}, 1606 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0}, 1607 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING}, 1608 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0}, 1609 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1610 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, 1611 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, 1612 MOPT_NO_EXT2 | MOPT_DATAJ}, 1613 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, 1614 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, 1615 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1616 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, 1617 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, 1618 #else 1619 {Opt_acl, 0, MOPT_NOSUPPORT}, 1620 {Opt_noacl, 0, MOPT_NOSUPPORT}, 1621 #endif 1622 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, 1623 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, 1624 {Opt_debug_want_extra_isize, 0, MOPT_GTE0}, 1625 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, 1626 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, 1627 MOPT_SET | MOPT_Q}, 1628 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, 1629 MOPT_SET | MOPT_Q}, 1630 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA, 1631 MOPT_SET | MOPT_Q}, 1632 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 1633 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA), 1634 MOPT_CLEAR | MOPT_Q}, 1635 {Opt_usrjquota, 0, MOPT_Q}, 1636 {Opt_grpjquota, 0, MOPT_Q}, 1637 {Opt_offusrjquota, 0, MOPT_Q}, 1638 {Opt_offgrpjquota, 0, MOPT_Q}, 1639 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, 1640 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, 1641 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, 1642 {Opt_max_dir_size_kb, 0, MOPT_GTE0}, 1643 {Opt_test_dummy_encryption, 0, MOPT_GTE0}, 1644 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET}, 1645 {Opt_err, 0, 0} 1646 }; 1647 1648 static int handle_mount_opt(struct super_block *sb, char *opt, int token, 1649 substring_t *args, unsigned long *journal_devnum, 1650 unsigned int *journal_ioprio, int is_remount) 1651 { 1652 struct ext4_sb_info *sbi = EXT4_SB(sb); 1653 const struct mount_opts *m; 1654 kuid_t uid; 1655 kgid_t gid; 1656 int arg = 0; 1657 1658 #ifdef CONFIG_QUOTA 1659 if (token == Opt_usrjquota) 1660 return set_qf_name(sb, USRQUOTA, &args[0]); 1661 else if (token == Opt_grpjquota) 1662 return set_qf_name(sb, GRPQUOTA, &args[0]); 1663 else if (token == Opt_offusrjquota) 1664 return clear_qf_name(sb, USRQUOTA); 1665 else if (token == Opt_offgrpjquota) 1666 return clear_qf_name(sb, GRPQUOTA); 1667 #endif 1668 switch (token) { 1669 case Opt_noacl: 1670 case Opt_nouser_xattr: 1671 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); 1672 break; 1673 case Opt_sb: 1674 return 1; /* handled by get_sb_block() */ 1675 case Opt_removed: 1676 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); 1677 return 1; 1678 case Opt_abort: 1679 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1680 return 1; 1681 case Opt_i_version: 1682 sb->s_flags |= MS_I_VERSION; 1683 return 1; 1684 case Opt_lazytime: 1685 sb->s_flags |= MS_LAZYTIME; 1686 return 1; 1687 case Opt_nolazytime: 1688 sb->s_flags &= ~MS_LAZYTIME; 1689 return 1; 1690 } 1691 1692 for (m = ext4_mount_opts; m->token != Opt_err; m++) 1693 if (token == m->token) 1694 break; 1695 1696 if (m->token == Opt_err) { 1697 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " 1698 "or missing value", opt); 1699 return -1; 1700 } 1701 1702 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { 1703 ext4_msg(sb, KERN_ERR, 1704 "Mount option \"%s\" incompatible with ext2", opt); 1705 return -1; 1706 } 1707 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { 1708 ext4_msg(sb, KERN_ERR, 1709 "Mount option \"%s\" incompatible with ext3", opt); 1710 return -1; 1711 } 1712 1713 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg)) 1714 return -1; 1715 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) 1716 return -1; 1717 if (m->flags & MOPT_EXPLICIT) { 1718 if (m->mount_opt & EXT4_MOUNT_DELALLOC) { 1719 set_opt2(sb, EXPLICIT_DELALLOC); 1720 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { 1721 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM); 1722 } else 1723 return -1; 1724 } 1725 if (m->flags & MOPT_CLEAR_ERR) 1726 clear_opt(sb, ERRORS_MASK); 1727 if (token == Opt_noquota && sb_any_quota_loaded(sb)) { 1728 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1729 "options when quota turned on"); 1730 return -1; 1731 } 1732 1733 if (m->flags & MOPT_NOSUPPORT) { 1734 ext4_msg(sb, KERN_ERR, "%s option not supported", opt); 1735 } else if (token == Opt_commit) { 1736 if (arg == 0) 1737 arg = JBD2_DEFAULT_MAX_COMMIT_AGE; 1738 sbi->s_commit_interval = HZ * arg; 1739 } else if (token == Opt_debug_want_extra_isize) { 1740 sbi->s_want_extra_isize = arg; 1741 } else if (token == Opt_max_batch_time) { 1742 sbi->s_max_batch_time = arg; 1743 } else if (token == Opt_min_batch_time) { 1744 sbi->s_min_batch_time = arg; 1745 } else if (token == Opt_inode_readahead_blks) { 1746 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { 1747 ext4_msg(sb, KERN_ERR, 1748 "EXT4-fs: inode_readahead_blks must be " 1749 "0 or a power of 2 smaller than 2^31"); 1750 return -1; 1751 } 1752 sbi->s_inode_readahead_blks = arg; 1753 } else if (token == Opt_init_itable) { 1754 set_opt(sb, INIT_INODE_TABLE); 1755 if (!args->from) 1756 arg = EXT4_DEF_LI_WAIT_MULT; 1757 sbi->s_li_wait_mult = arg; 1758 } else if (token == Opt_max_dir_size_kb) { 1759 sbi->s_max_dir_size_kb = arg; 1760 } else if (token == Opt_stripe) { 1761 sbi->s_stripe = arg; 1762 } else if (token == Opt_resuid) { 1763 uid = make_kuid(current_user_ns(), arg); 1764 if (!uid_valid(uid)) { 1765 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); 1766 return -1; 1767 } 1768 sbi->s_resuid = uid; 1769 } else if (token == Opt_resgid) { 1770 gid = make_kgid(current_user_ns(), arg); 1771 if (!gid_valid(gid)) { 1772 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); 1773 return -1; 1774 } 1775 sbi->s_resgid = gid; 1776 } else if (token == Opt_journal_dev) { 1777 if (is_remount) { 1778 ext4_msg(sb, KERN_ERR, 1779 "Cannot specify journal on remount"); 1780 return -1; 1781 } 1782 *journal_devnum = arg; 1783 } else if (token == Opt_journal_path) { 1784 char *journal_path; 1785 struct inode *journal_inode; 1786 struct path path; 1787 int error; 1788 1789 if (is_remount) { 1790 ext4_msg(sb, KERN_ERR, 1791 "Cannot specify journal on remount"); 1792 return -1; 1793 } 1794 journal_path = match_strdup(&args[0]); 1795 if (!journal_path) { 1796 ext4_msg(sb, KERN_ERR, "error: could not dup " 1797 "journal device string"); 1798 return -1; 1799 } 1800 1801 error = kern_path(journal_path, LOOKUP_FOLLOW, &path); 1802 if (error) { 1803 ext4_msg(sb, KERN_ERR, "error: could not find " 1804 "journal device path: error %d", error); 1805 kfree(journal_path); 1806 return -1; 1807 } 1808 1809 journal_inode = d_inode(path.dentry); 1810 if (!S_ISBLK(journal_inode->i_mode)) { 1811 ext4_msg(sb, KERN_ERR, "error: journal path %s " 1812 "is not a block device", journal_path); 1813 path_put(&path); 1814 kfree(journal_path); 1815 return -1; 1816 } 1817 1818 *journal_devnum = new_encode_dev(journal_inode->i_rdev); 1819 path_put(&path); 1820 kfree(journal_path); 1821 } else if (token == Opt_journal_ioprio) { 1822 if (arg > 7) { 1823 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" 1824 " (must be 0-7)"); 1825 return -1; 1826 } 1827 *journal_ioprio = 1828 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); 1829 } else if (token == Opt_test_dummy_encryption) { 1830 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1831 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; 1832 ext4_msg(sb, KERN_WARNING, 1833 "Test dummy encryption mode enabled"); 1834 #else 1835 ext4_msg(sb, KERN_WARNING, 1836 "Test dummy encryption mount option ignored"); 1837 #endif 1838 } else if (m->flags & MOPT_DATAJ) { 1839 if (is_remount) { 1840 if (!sbi->s_journal) 1841 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); 1842 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) { 1843 ext4_msg(sb, KERN_ERR, 1844 "Cannot change data mode on remount"); 1845 return -1; 1846 } 1847 } else { 1848 clear_opt(sb, DATA_FLAGS); 1849 sbi->s_mount_opt |= m->mount_opt; 1850 } 1851 #ifdef CONFIG_QUOTA 1852 } else if (m->flags & MOPT_QFMT) { 1853 if (sb_any_quota_loaded(sb) && 1854 sbi->s_jquota_fmt != m->mount_opt) { 1855 ext4_msg(sb, KERN_ERR, "Cannot change journaled " 1856 "quota options when quota turned on"); 1857 return -1; 1858 } 1859 if (ext4_has_feature_quota(sb)) { 1860 ext4_msg(sb, KERN_INFO, 1861 "Quota format mount options ignored " 1862 "when QUOTA feature is enabled"); 1863 return 1; 1864 } 1865 sbi->s_jquota_fmt = m->mount_opt; 1866 #endif 1867 } else if (token == Opt_dax) { 1868 #ifdef CONFIG_FS_DAX 1869 ext4_msg(sb, KERN_WARNING, 1870 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 1871 sbi->s_mount_opt |= m->mount_opt; 1872 #else 1873 ext4_msg(sb, KERN_INFO, "dax option not supported"); 1874 return -1; 1875 #endif 1876 } else if (token == Opt_data_err_abort) { 1877 sbi->s_mount_opt |= m->mount_opt; 1878 } else if (token == Opt_data_err_ignore) { 1879 sbi->s_mount_opt &= ~m->mount_opt; 1880 } else { 1881 if (!args->from) 1882 arg = 1; 1883 if (m->flags & MOPT_CLEAR) 1884 arg = !arg; 1885 else if (unlikely(!(m->flags & MOPT_SET))) { 1886 ext4_msg(sb, KERN_WARNING, 1887 "buggy handling of option %s", opt); 1888 WARN_ON(1); 1889 return -1; 1890 } 1891 if (arg != 0) 1892 sbi->s_mount_opt |= m->mount_opt; 1893 else 1894 sbi->s_mount_opt &= ~m->mount_opt; 1895 } 1896 return 1; 1897 } 1898 1899 static int parse_options(char *options, struct super_block *sb, 1900 unsigned long *journal_devnum, 1901 unsigned int *journal_ioprio, 1902 int is_remount) 1903 { 1904 struct ext4_sb_info *sbi = EXT4_SB(sb); 1905 char *p; 1906 substring_t args[MAX_OPT_ARGS]; 1907 int token; 1908 1909 if (!options) 1910 return 1; 1911 1912 while ((p = strsep(&options, ",")) != NULL) { 1913 if (!*p) 1914 continue; 1915 /* 1916 * Initialize args struct so we know whether arg was 1917 * found; some options take optional arguments. 1918 */ 1919 args[0].to = args[0].from = NULL; 1920 token = match_token(p, tokens, args); 1921 if (handle_mount_opt(sb, p, token, args, journal_devnum, 1922 journal_ioprio, is_remount) < 0) 1923 return 0; 1924 } 1925 #ifdef CONFIG_QUOTA 1926 /* 1927 * We do the test below only for project quotas. 'usrquota' and 1928 * 'grpquota' mount options are allowed even without quota feature 1929 * to support legacy quotas in quota files. 1930 */ 1931 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) { 1932 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. " 1933 "Cannot enable project quota enforcement."); 1934 return 0; 1935 } 1936 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1937 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1938 clear_opt(sb, USRQUOTA); 1939 1940 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1941 clear_opt(sb, GRPQUOTA); 1942 1943 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1944 ext4_msg(sb, KERN_ERR, "old and new quota " 1945 "format mixing"); 1946 return 0; 1947 } 1948 1949 if (!sbi->s_jquota_fmt) { 1950 ext4_msg(sb, KERN_ERR, "journaled quota format " 1951 "not specified"); 1952 return 0; 1953 } 1954 } 1955 #endif 1956 if (test_opt(sb, DIOREAD_NOLOCK)) { 1957 int blocksize = 1958 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 1959 1960 if (blocksize < PAGE_SIZE) { 1961 ext4_msg(sb, KERN_ERR, "can't mount with " 1962 "dioread_nolock if block size != PAGE_SIZE"); 1963 return 0; 1964 } 1965 } 1966 return 1; 1967 } 1968 1969 static inline void ext4_show_quota_options(struct seq_file *seq, 1970 struct super_block *sb) 1971 { 1972 #if defined(CONFIG_QUOTA) 1973 struct ext4_sb_info *sbi = EXT4_SB(sb); 1974 1975 if (sbi->s_jquota_fmt) { 1976 char *fmtname = ""; 1977 1978 switch (sbi->s_jquota_fmt) { 1979 case QFMT_VFS_OLD: 1980 fmtname = "vfsold"; 1981 break; 1982 case QFMT_VFS_V0: 1983 fmtname = "vfsv0"; 1984 break; 1985 case QFMT_VFS_V1: 1986 fmtname = "vfsv1"; 1987 break; 1988 } 1989 seq_printf(seq, ",jqfmt=%s", fmtname); 1990 } 1991 1992 if (sbi->s_qf_names[USRQUOTA]) 1993 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]); 1994 1995 if (sbi->s_qf_names[GRPQUOTA]) 1996 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]); 1997 #endif 1998 } 1999 2000 static const char *token2str(int token) 2001 { 2002 const struct match_token *t; 2003 2004 for (t = tokens; t->token != Opt_err; t++) 2005 if (t->token == token && !strchr(t->pattern, '=')) 2006 break; 2007 return t->pattern; 2008 } 2009 2010 /* 2011 * Show an option if 2012 * - it's set to a non-default value OR 2013 * - if the per-sb default is different from the global default 2014 */ 2015 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, 2016 int nodefs) 2017 { 2018 struct ext4_sb_info *sbi = EXT4_SB(sb); 2019 struct ext4_super_block *es = sbi->s_es; 2020 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; 2021 const struct mount_opts *m; 2022 char sep = nodefs ? '\n' : ','; 2023 2024 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) 2025 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) 2026 2027 if (sbi->s_sb_block != 1) 2028 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); 2029 2030 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 2031 int want_set = m->flags & MOPT_SET; 2032 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || 2033 (m->flags & MOPT_CLEAR_ERR)) 2034 continue; 2035 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) 2036 continue; /* skip if same as the default */ 2037 if ((want_set && 2038 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || 2039 (!want_set && (sbi->s_mount_opt & m->mount_opt))) 2040 continue; /* select Opt_noFoo vs Opt_Foo */ 2041 SEQ_OPTS_PRINT("%s", token2str(m->token)); 2042 } 2043 2044 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || 2045 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) 2046 SEQ_OPTS_PRINT("resuid=%u", 2047 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 2048 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || 2049 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) 2050 SEQ_OPTS_PRINT("resgid=%u", 2051 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 2052 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); 2053 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) 2054 SEQ_OPTS_PUTS("errors=remount-ro"); 2055 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 2056 SEQ_OPTS_PUTS("errors=continue"); 2057 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 2058 SEQ_OPTS_PUTS("errors=panic"); 2059 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 2060 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); 2061 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) 2062 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); 2063 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) 2064 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); 2065 if (sb->s_flags & MS_I_VERSION) 2066 SEQ_OPTS_PUTS("i_version"); 2067 if (nodefs || sbi->s_stripe) 2068 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); 2069 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { 2070 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 2071 SEQ_OPTS_PUTS("data=journal"); 2072 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 2073 SEQ_OPTS_PUTS("data=ordered"); 2074 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 2075 SEQ_OPTS_PUTS("data=writeback"); 2076 } 2077 if (nodefs || 2078 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 2079 SEQ_OPTS_PRINT("inode_readahead_blks=%u", 2080 sbi->s_inode_readahead_blks); 2081 2082 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && 2083 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) 2084 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); 2085 if (nodefs || sbi->s_max_dir_size_kb) 2086 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); 2087 if (test_opt(sb, DATA_ERR_ABORT)) 2088 SEQ_OPTS_PUTS("data_err=abort"); 2089 2090 ext4_show_quota_options(seq, sb); 2091 return 0; 2092 } 2093 2094 static int ext4_show_options(struct seq_file *seq, struct dentry *root) 2095 { 2096 return _ext4_show_options(seq, root->d_sb, 0); 2097 } 2098 2099 int ext4_seq_options_show(struct seq_file *seq, void *offset) 2100 { 2101 struct super_block *sb = seq->private; 2102 int rc; 2103 2104 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); 2105 rc = _ext4_show_options(seq, sb, 1); 2106 seq_puts(seq, "\n"); 2107 return rc; 2108 } 2109 2110 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 2111 int read_only) 2112 { 2113 struct ext4_sb_info *sbi = EXT4_SB(sb); 2114 int res = 0; 2115 2116 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 2117 ext4_msg(sb, KERN_ERR, "revision level too high, " 2118 "forcing read-only mode"); 2119 res = MS_RDONLY; 2120 } 2121 if (read_only) 2122 goto done; 2123 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 2124 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 2125 "running e2fsck is recommended"); 2126 else if (sbi->s_mount_state & EXT4_ERROR_FS) 2127 ext4_msg(sb, KERN_WARNING, 2128 "warning: mounting fs with errors, " 2129 "running e2fsck is recommended"); 2130 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 2131 le16_to_cpu(es->s_mnt_count) >= 2132 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 2133 ext4_msg(sb, KERN_WARNING, 2134 "warning: maximal mount count reached, " 2135 "running e2fsck is recommended"); 2136 else if (le32_to_cpu(es->s_checkinterval) && 2137 (le32_to_cpu(es->s_lastcheck) + 2138 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 2139 ext4_msg(sb, KERN_WARNING, 2140 "warning: checktime reached, " 2141 "running e2fsck is recommended"); 2142 if (!sbi->s_journal) 2143 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 2144 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 2145 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 2146 le16_add_cpu(&es->s_mnt_count, 1); 2147 es->s_mtime = cpu_to_le32(get_seconds()); 2148 ext4_update_dynamic_rev(sb); 2149 if (sbi->s_journal) 2150 ext4_set_feature_journal_needs_recovery(sb); 2151 2152 ext4_commit_super(sb, 1); 2153 done: 2154 if (test_opt(sb, DEBUG)) 2155 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 2156 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 2157 sb->s_blocksize, 2158 sbi->s_groups_count, 2159 EXT4_BLOCKS_PER_GROUP(sb), 2160 EXT4_INODES_PER_GROUP(sb), 2161 sbi->s_mount_opt, sbi->s_mount_opt2); 2162 2163 cleancache_init_fs(sb); 2164 return res; 2165 } 2166 2167 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) 2168 { 2169 struct ext4_sb_info *sbi = EXT4_SB(sb); 2170 struct flex_groups *new_groups; 2171 int size; 2172 2173 if (!sbi->s_log_groups_per_flex) 2174 return 0; 2175 2176 size = ext4_flex_group(sbi, ngroup - 1) + 1; 2177 if (size <= sbi->s_flex_groups_allocated) 2178 return 0; 2179 2180 size = roundup_pow_of_two(size * sizeof(struct flex_groups)); 2181 new_groups = kvzalloc(size, GFP_KERNEL); 2182 if (!new_groups) { 2183 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", 2184 size / (int) sizeof(struct flex_groups)); 2185 return -ENOMEM; 2186 } 2187 2188 if (sbi->s_flex_groups) { 2189 memcpy(new_groups, sbi->s_flex_groups, 2190 (sbi->s_flex_groups_allocated * 2191 sizeof(struct flex_groups))); 2192 kvfree(sbi->s_flex_groups); 2193 } 2194 sbi->s_flex_groups = new_groups; 2195 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); 2196 return 0; 2197 } 2198 2199 static int ext4_fill_flex_info(struct super_block *sb) 2200 { 2201 struct ext4_sb_info *sbi = EXT4_SB(sb); 2202 struct ext4_group_desc *gdp = NULL; 2203 ext4_group_t flex_group; 2204 int i, err; 2205 2206 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 2207 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 2208 sbi->s_log_groups_per_flex = 0; 2209 return 1; 2210 } 2211 2212 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); 2213 if (err) 2214 goto failed; 2215 2216 for (i = 0; i < sbi->s_groups_count; i++) { 2217 gdp = ext4_get_group_desc(sb, i, NULL); 2218 2219 flex_group = ext4_flex_group(sbi, i); 2220 atomic_add(ext4_free_inodes_count(sb, gdp), 2221 &sbi->s_flex_groups[flex_group].free_inodes); 2222 atomic64_add(ext4_free_group_clusters(sb, gdp), 2223 &sbi->s_flex_groups[flex_group].free_clusters); 2224 atomic_add(ext4_used_dirs_count(sb, gdp), 2225 &sbi->s_flex_groups[flex_group].used_dirs); 2226 } 2227 2228 return 1; 2229 failed: 2230 return 0; 2231 } 2232 2233 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, 2234 struct ext4_group_desc *gdp) 2235 { 2236 int offset = offsetof(struct ext4_group_desc, bg_checksum); 2237 __u16 crc = 0; 2238 __le32 le_group = cpu_to_le32(block_group); 2239 struct ext4_sb_info *sbi = EXT4_SB(sb); 2240 2241 if (ext4_has_metadata_csum(sbi->s_sb)) { 2242 /* Use new metadata_csum algorithm */ 2243 __u32 csum32; 2244 __u16 dummy_csum = 0; 2245 2246 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, 2247 sizeof(le_group)); 2248 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset); 2249 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum, 2250 sizeof(dummy_csum)); 2251 offset += sizeof(dummy_csum); 2252 if (offset < sbi->s_desc_size) 2253 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset, 2254 sbi->s_desc_size - offset); 2255 2256 crc = csum32 & 0xFFFF; 2257 goto out; 2258 } 2259 2260 /* old crc16 code */ 2261 if (!ext4_has_feature_gdt_csum(sb)) 2262 return 0; 2263 2264 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 2265 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 2266 crc = crc16(crc, (__u8 *)gdp, offset); 2267 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 2268 /* for checksum of struct ext4_group_desc do the rest...*/ 2269 if (ext4_has_feature_64bit(sb) && 2270 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 2271 crc = crc16(crc, (__u8 *)gdp + offset, 2272 le16_to_cpu(sbi->s_es->s_desc_size) - 2273 offset); 2274 2275 out: 2276 return cpu_to_le16(crc); 2277 } 2278 2279 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, 2280 struct ext4_group_desc *gdp) 2281 { 2282 if (ext4_has_group_desc_csum(sb) && 2283 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) 2284 return 0; 2285 2286 return 1; 2287 } 2288 2289 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, 2290 struct ext4_group_desc *gdp) 2291 { 2292 if (!ext4_has_group_desc_csum(sb)) 2293 return; 2294 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); 2295 } 2296 2297 /* Called at mount-time, super-block is locked */ 2298 static int ext4_check_descriptors(struct super_block *sb, 2299 ext4_fsblk_t sb_block, 2300 ext4_group_t *first_not_zeroed) 2301 { 2302 struct ext4_sb_info *sbi = EXT4_SB(sb); 2303 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 2304 ext4_fsblk_t last_block; 2305 ext4_fsblk_t block_bitmap; 2306 ext4_fsblk_t inode_bitmap; 2307 ext4_fsblk_t inode_table; 2308 int flexbg_flag = 0; 2309 ext4_group_t i, grp = sbi->s_groups_count; 2310 2311 if (ext4_has_feature_flex_bg(sb)) 2312 flexbg_flag = 1; 2313 2314 ext4_debug("Checking group descriptors"); 2315 2316 for (i = 0; i < sbi->s_groups_count; i++) { 2317 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2318 2319 if (i == sbi->s_groups_count - 1 || flexbg_flag) 2320 last_block = ext4_blocks_count(sbi->s_es) - 1; 2321 else 2322 last_block = first_block + 2323 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2324 2325 if ((grp == sbi->s_groups_count) && 2326 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2327 grp = i; 2328 2329 block_bitmap = ext4_block_bitmap(sb, gdp); 2330 if (block_bitmap == sb_block) { 2331 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2332 "Block bitmap for group %u overlaps " 2333 "superblock", i); 2334 } 2335 if (block_bitmap < first_block || block_bitmap > last_block) { 2336 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2337 "Block bitmap for group %u not in group " 2338 "(block %llu)!", i, block_bitmap); 2339 return 0; 2340 } 2341 inode_bitmap = ext4_inode_bitmap(sb, gdp); 2342 if (inode_bitmap == sb_block) { 2343 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2344 "Inode bitmap for group %u overlaps " 2345 "superblock", i); 2346 } 2347 if (inode_bitmap < first_block || inode_bitmap > last_block) { 2348 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2349 "Inode bitmap for group %u not in group " 2350 "(block %llu)!", i, inode_bitmap); 2351 return 0; 2352 } 2353 inode_table = ext4_inode_table(sb, gdp); 2354 if (inode_table == sb_block) { 2355 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2356 "Inode table for group %u overlaps " 2357 "superblock", i); 2358 } 2359 if (inode_table < first_block || 2360 inode_table + sbi->s_itb_per_group - 1 > last_block) { 2361 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2362 "Inode table for group %u not in group " 2363 "(block %llu)!", i, inode_table); 2364 return 0; 2365 } 2366 ext4_lock_group(sb, i); 2367 if (!ext4_group_desc_csum_verify(sb, i, gdp)) { 2368 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2369 "Checksum for group %u failed (%u!=%u)", 2370 i, le16_to_cpu(ext4_group_desc_csum(sb, i, 2371 gdp)), le16_to_cpu(gdp->bg_checksum)); 2372 if (!(sb->s_flags & MS_RDONLY)) { 2373 ext4_unlock_group(sb, i); 2374 return 0; 2375 } 2376 } 2377 ext4_unlock_group(sb, i); 2378 if (!flexbg_flag) 2379 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2380 } 2381 if (NULL != first_not_zeroed) 2382 *first_not_zeroed = grp; 2383 return 1; 2384 } 2385 2386 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2387 * the superblock) which were deleted from all directories, but held open by 2388 * a process at the time of a crash. We walk the list and try to delete these 2389 * inodes at recovery time (only with a read-write filesystem). 2390 * 2391 * In order to keep the orphan inode chain consistent during traversal (in 2392 * case of crash during recovery), we link each inode into the superblock 2393 * orphan list_head and handle it the same way as an inode deletion during 2394 * normal operation (which journals the operations for us). 2395 * 2396 * We only do an iget() and an iput() on each inode, which is very safe if we 2397 * accidentally point at an in-use or already deleted inode. The worst that 2398 * can happen in this case is that we get a "bit already cleared" message from 2399 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2400 * e2fsck was run on this filesystem, and it must have already done the orphan 2401 * inode cleanup for us, so we can safely abort without any further action. 2402 */ 2403 static void ext4_orphan_cleanup(struct super_block *sb, 2404 struct ext4_super_block *es) 2405 { 2406 unsigned int s_flags = sb->s_flags; 2407 int ret, nr_orphans = 0, nr_truncates = 0; 2408 #ifdef CONFIG_QUOTA 2409 int i; 2410 #endif 2411 if (!es->s_last_orphan) { 2412 jbd_debug(4, "no orphan inodes to clean up\n"); 2413 return; 2414 } 2415 2416 if (bdev_read_only(sb->s_bdev)) { 2417 ext4_msg(sb, KERN_ERR, "write access " 2418 "unavailable, skipping orphan cleanup"); 2419 return; 2420 } 2421 2422 /* Check if feature set would not allow a r/w mount */ 2423 if (!ext4_feature_set_ok(sb, 0)) { 2424 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2425 "unknown ROCOMPAT features"); 2426 return; 2427 } 2428 2429 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2430 /* don't clear list on RO mount w/ errors */ 2431 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { 2432 ext4_msg(sb, KERN_INFO, "Errors on filesystem, " 2433 "clearing orphan list.\n"); 2434 es->s_last_orphan = 0; 2435 } 2436 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2437 return; 2438 } 2439 2440 if (s_flags & MS_RDONLY) { 2441 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2442 sb->s_flags &= ~MS_RDONLY; 2443 } 2444 #ifdef CONFIG_QUOTA 2445 /* Needed for iput() to work correctly and not trash data */ 2446 sb->s_flags |= MS_ACTIVE; 2447 /* Turn on quotas so that they are updated correctly */ 2448 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2449 if (EXT4_SB(sb)->s_qf_names[i]) { 2450 int ret = ext4_quota_on_mount(sb, i); 2451 if (ret < 0) 2452 ext4_msg(sb, KERN_ERR, 2453 "Cannot turn on journaled " 2454 "quota: error %d", ret); 2455 } 2456 } 2457 #endif 2458 2459 while (es->s_last_orphan) { 2460 struct inode *inode; 2461 2462 /* 2463 * We may have encountered an error during cleanup; if 2464 * so, skip the rest. 2465 */ 2466 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2467 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2468 es->s_last_orphan = 0; 2469 break; 2470 } 2471 2472 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2473 if (IS_ERR(inode)) { 2474 es->s_last_orphan = 0; 2475 break; 2476 } 2477 2478 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2479 dquot_initialize(inode); 2480 if (inode->i_nlink) { 2481 if (test_opt(sb, DEBUG)) 2482 ext4_msg(sb, KERN_DEBUG, 2483 "%s: truncating inode %lu to %lld bytes", 2484 __func__, inode->i_ino, inode->i_size); 2485 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2486 inode->i_ino, inode->i_size); 2487 inode_lock(inode); 2488 truncate_inode_pages(inode->i_mapping, inode->i_size); 2489 ret = ext4_truncate(inode); 2490 if (ret) 2491 ext4_std_error(inode->i_sb, ret); 2492 inode_unlock(inode); 2493 nr_truncates++; 2494 } else { 2495 if (test_opt(sb, DEBUG)) 2496 ext4_msg(sb, KERN_DEBUG, 2497 "%s: deleting unreferenced inode %lu", 2498 __func__, inode->i_ino); 2499 jbd_debug(2, "deleting unreferenced inode %lu\n", 2500 inode->i_ino); 2501 nr_orphans++; 2502 } 2503 iput(inode); /* The delete magic happens here! */ 2504 } 2505 2506 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2507 2508 if (nr_orphans) 2509 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2510 PLURAL(nr_orphans)); 2511 if (nr_truncates) 2512 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2513 PLURAL(nr_truncates)); 2514 #ifdef CONFIG_QUOTA 2515 /* Turn quotas off */ 2516 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 2517 if (sb_dqopt(sb)->files[i]) 2518 dquot_quota_off(sb, i); 2519 } 2520 #endif 2521 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2522 } 2523 2524 /* 2525 * Maximal extent format file size. 2526 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2527 * extent format containers, within a sector_t, and within i_blocks 2528 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2529 * so that won't be a limiting factor. 2530 * 2531 * However there is other limiting factor. We do store extents in the form 2532 * of starting block and length, hence the resulting length of the extent 2533 * covering maximum file size must fit into on-disk format containers as 2534 * well. Given that length is always by 1 unit bigger than max unit (because 2535 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2536 * 2537 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2538 */ 2539 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2540 { 2541 loff_t res; 2542 loff_t upper_limit = MAX_LFS_FILESIZE; 2543 2544 /* small i_blocks in vfs inode? */ 2545 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2546 /* 2547 * CONFIG_LBDAF is not enabled implies the inode 2548 * i_block represent total blocks in 512 bytes 2549 * 32 == size of vfs inode i_blocks * 8 2550 */ 2551 upper_limit = (1LL << 32) - 1; 2552 2553 /* total blocks in file system block size */ 2554 upper_limit >>= (blkbits - 9); 2555 upper_limit <<= blkbits; 2556 } 2557 2558 /* 2559 * 32-bit extent-start container, ee_block. We lower the maxbytes 2560 * by one fs block, so ee_len can cover the extent of maximum file 2561 * size 2562 */ 2563 res = (1LL << 32) - 1; 2564 res <<= blkbits; 2565 2566 /* Sanity check against vm- & vfs- imposed limits */ 2567 if (res > upper_limit) 2568 res = upper_limit; 2569 2570 return res; 2571 } 2572 2573 /* 2574 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2575 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2576 * We need to be 1 filesystem block less than the 2^48 sector limit. 2577 */ 2578 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2579 { 2580 loff_t res = EXT4_NDIR_BLOCKS; 2581 int meta_blocks; 2582 loff_t upper_limit; 2583 /* This is calculated to be the largest file size for a dense, block 2584 * mapped file such that the file's total number of 512-byte sectors, 2585 * including data and all indirect blocks, does not exceed (2^48 - 1). 2586 * 2587 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2588 * number of 512-byte sectors of the file. 2589 */ 2590 2591 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2592 /* 2593 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2594 * the inode i_block field represents total file blocks in 2595 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2596 */ 2597 upper_limit = (1LL << 32) - 1; 2598 2599 /* total blocks in file system block size */ 2600 upper_limit >>= (bits - 9); 2601 2602 } else { 2603 /* 2604 * We use 48 bit ext4_inode i_blocks 2605 * With EXT4_HUGE_FILE_FL set the i_blocks 2606 * represent total number of blocks in 2607 * file system block size 2608 */ 2609 upper_limit = (1LL << 48) - 1; 2610 2611 } 2612 2613 /* indirect blocks */ 2614 meta_blocks = 1; 2615 /* double indirect blocks */ 2616 meta_blocks += 1 + (1LL << (bits-2)); 2617 /* tripple indirect blocks */ 2618 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2619 2620 upper_limit -= meta_blocks; 2621 upper_limit <<= bits; 2622 2623 res += 1LL << (bits-2); 2624 res += 1LL << (2*(bits-2)); 2625 res += 1LL << (3*(bits-2)); 2626 res <<= bits; 2627 if (res > upper_limit) 2628 res = upper_limit; 2629 2630 if (res > MAX_LFS_FILESIZE) 2631 res = MAX_LFS_FILESIZE; 2632 2633 return res; 2634 } 2635 2636 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2637 ext4_fsblk_t logical_sb_block, int nr) 2638 { 2639 struct ext4_sb_info *sbi = EXT4_SB(sb); 2640 ext4_group_t bg, first_meta_bg; 2641 int has_super = 0; 2642 2643 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2644 2645 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg) 2646 return logical_sb_block + nr + 1; 2647 bg = sbi->s_desc_per_block * nr; 2648 if (ext4_bg_has_super(sb, bg)) 2649 has_super = 1; 2650 2651 /* 2652 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at 2653 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled 2654 * on modern mke2fs or blksize > 1k on older mke2fs) then we must 2655 * compensate. 2656 */ 2657 if (sb->s_blocksize == 1024 && nr == 0 && 2658 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0) 2659 has_super++; 2660 2661 return (has_super + ext4_group_first_block_no(sb, bg)); 2662 } 2663 2664 /** 2665 * ext4_get_stripe_size: Get the stripe size. 2666 * @sbi: In memory super block info 2667 * 2668 * If we have specified it via mount option, then 2669 * use the mount option value. If the value specified at mount time is 2670 * greater than the blocks per group use the super block value. 2671 * If the super block value is greater than blocks per group return 0. 2672 * Allocator needs it be less than blocks per group. 2673 * 2674 */ 2675 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2676 { 2677 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2678 unsigned long stripe_width = 2679 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2680 int ret; 2681 2682 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2683 ret = sbi->s_stripe; 2684 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group) 2685 ret = stripe_width; 2686 else if (stride && stride <= sbi->s_blocks_per_group) 2687 ret = stride; 2688 else 2689 ret = 0; 2690 2691 /* 2692 * If the stripe width is 1, this makes no sense and 2693 * we set it to 0 to turn off stripe handling code. 2694 */ 2695 if (ret <= 1) 2696 ret = 0; 2697 2698 return ret; 2699 } 2700 2701 /* 2702 * Check whether this filesystem can be mounted based on 2703 * the features present and the RDONLY/RDWR mount requested. 2704 * Returns 1 if this filesystem can be mounted as requested, 2705 * 0 if it cannot be. 2706 */ 2707 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2708 { 2709 if (ext4_has_unknown_ext4_incompat_features(sb)) { 2710 ext4_msg(sb, KERN_ERR, 2711 "Couldn't mount because of " 2712 "unsupported optional features (%x)", 2713 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2714 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2715 return 0; 2716 } 2717 2718 if (readonly) 2719 return 1; 2720 2721 if (ext4_has_feature_readonly(sb)) { 2722 ext4_msg(sb, KERN_INFO, "filesystem is read-only"); 2723 sb->s_flags |= MS_RDONLY; 2724 return 1; 2725 } 2726 2727 /* Check that feature set is OK for a read-write mount */ 2728 if (ext4_has_unknown_ext4_ro_compat_features(sb)) { 2729 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2730 "unsupported optional features (%x)", 2731 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2732 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2733 return 0; 2734 } 2735 /* 2736 * Large file size enabled file system can only be mounted 2737 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2738 */ 2739 if (ext4_has_feature_huge_file(sb)) { 2740 if (sizeof(blkcnt_t) < sizeof(u64)) { 2741 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2742 "cannot be mounted RDWR without " 2743 "CONFIG_LBDAF"); 2744 return 0; 2745 } 2746 } 2747 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) { 2748 ext4_msg(sb, KERN_ERR, 2749 "Can't support bigalloc feature without " 2750 "extents feature\n"); 2751 return 0; 2752 } 2753 2754 #ifndef CONFIG_QUOTA 2755 if (ext4_has_feature_quota(sb) && !readonly) { 2756 ext4_msg(sb, KERN_ERR, 2757 "Filesystem with quota feature cannot be mounted RDWR " 2758 "without CONFIG_QUOTA"); 2759 return 0; 2760 } 2761 if (ext4_has_feature_project(sb) && !readonly) { 2762 ext4_msg(sb, KERN_ERR, 2763 "Filesystem with project quota feature cannot be mounted RDWR " 2764 "without CONFIG_QUOTA"); 2765 return 0; 2766 } 2767 #endif /* CONFIG_QUOTA */ 2768 return 1; 2769 } 2770 2771 /* 2772 * This function is called once a day if we have errors logged 2773 * on the file system 2774 */ 2775 static void print_daily_error_info(unsigned long arg) 2776 { 2777 struct super_block *sb = (struct super_block *) arg; 2778 struct ext4_sb_info *sbi; 2779 struct ext4_super_block *es; 2780 2781 sbi = EXT4_SB(sb); 2782 es = sbi->s_es; 2783 2784 if (es->s_error_count) 2785 /* fsck newer than v1.41.13 is needed to clean this condition. */ 2786 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", 2787 le32_to_cpu(es->s_error_count)); 2788 if (es->s_first_error_time) { 2789 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d", 2790 sb->s_id, le32_to_cpu(es->s_first_error_time), 2791 (int) sizeof(es->s_first_error_func), 2792 es->s_first_error_func, 2793 le32_to_cpu(es->s_first_error_line)); 2794 if (es->s_first_error_ino) 2795 printk(KERN_CONT ": inode %u", 2796 le32_to_cpu(es->s_first_error_ino)); 2797 if (es->s_first_error_block) 2798 printk(KERN_CONT ": block %llu", (unsigned long long) 2799 le64_to_cpu(es->s_first_error_block)); 2800 printk(KERN_CONT "\n"); 2801 } 2802 if (es->s_last_error_time) { 2803 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d", 2804 sb->s_id, le32_to_cpu(es->s_last_error_time), 2805 (int) sizeof(es->s_last_error_func), 2806 es->s_last_error_func, 2807 le32_to_cpu(es->s_last_error_line)); 2808 if (es->s_last_error_ino) 2809 printk(KERN_CONT ": inode %u", 2810 le32_to_cpu(es->s_last_error_ino)); 2811 if (es->s_last_error_block) 2812 printk(KERN_CONT ": block %llu", (unsigned long long) 2813 le64_to_cpu(es->s_last_error_block)); 2814 printk(KERN_CONT "\n"); 2815 } 2816 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2817 } 2818 2819 /* Find next suitable group and run ext4_init_inode_table */ 2820 static int ext4_run_li_request(struct ext4_li_request *elr) 2821 { 2822 struct ext4_group_desc *gdp = NULL; 2823 ext4_group_t group, ngroups; 2824 struct super_block *sb; 2825 unsigned long timeout = 0; 2826 int ret = 0; 2827 2828 sb = elr->lr_super; 2829 ngroups = EXT4_SB(sb)->s_groups_count; 2830 2831 for (group = elr->lr_next_group; group < ngroups; group++) { 2832 gdp = ext4_get_group_desc(sb, group, NULL); 2833 if (!gdp) { 2834 ret = 1; 2835 break; 2836 } 2837 2838 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2839 break; 2840 } 2841 2842 if (group >= ngroups) 2843 ret = 1; 2844 2845 if (!ret) { 2846 timeout = jiffies; 2847 ret = ext4_init_inode_table(sb, group, 2848 elr->lr_timeout ? 0 : 1); 2849 if (elr->lr_timeout == 0) { 2850 timeout = (jiffies - timeout) * 2851 elr->lr_sbi->s_li_wait_mult; 2852 elr->lr_timeout = timeout; 2853 } 2854 elr->lr_next_sched = jiffies + elr->lr_timeout; 2855 elr->lr_next_group = group + 1; 2856 } 2857 return ret; 2858 } 2859 2860 /* 2861 * Remove lr_request from the list_request and free the 2862 * request structure. Should be called with li_list_mtx held 2863 */ 2864 static void ext4_remove_li_request(struct ext4_li_request *elr) 2865 { 2866 struct ext4_sb_info *sbi; 2867 2868 if (!elr) 2869 return; 2870 2871 sbi = elr->lr_sbi; 2872 2873 list_del(&elr->lr_request); 2874 sbi->s_li_request = NULL; 2875 kfree(elr); 2876 } 2877 2878 static void ext4_unregister_li_request(struct super_block *sb) 2879 { 2880 mutex_lock(&ext4_li_mtx); 2881 if (!ext4_li_info) { 2882 mutex_unlock(&ext4_li_mtx); 2883 return; 2884 } 2885 2886 mutex_lock(&ext4_li_info->li_list_mtx); 2887 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2888 mutex_unlock(&ext4_li_info->li_list_mtx); 2889 mutex_unlock(&ext4_li_mtx); 2890 } 2891 2892 static struct task_struct *ext4_lazyinit_task; 2893 2894 /* 2895 * This is the function where ext4lazyinit thread lives. It walks 2896 * through the request list searching for next scheduled filesystem. 2897 * When such a fs is found, run the lazy initialization request 2898 * (ext4_rn_li_request) and keep track of the time spend in this 2899 * function. Based on that time we compute next schedule time of 2900 * the request. When walking through the list is complete, compute 2901 * next waking time and put itself into sleep. 2902 */ 2903 static int ext4_lazyinit_thread(void *arg) 2904 { 2905 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2906 struct list_head *pos, *n; 2907 struct ext4_li_request *elr; 2908 unsigned long next_wakeup, cur; 2909 2910 BUG_ON(NULL == eli); 2911 2912 cont_thread: 2913 while (true) { 2914 next_wakeup = MAX_JIFFY_OFFSET; 2915 2916 mutex_lock(&eli->li_list_mtx); 2917 if (list_empty(&eli->li_request_list)) { 2918 mutex_unlock(&eli->li_list_mtx); 2919 goto exit_thread; 2920 } 2921 list_for_each_safe(pos, n, &eli->li_request_list) { 2922 int err = 0; 2923 int progress = 0; 2924 elr = list_entry(pos, struct ext4_li_request, 2925 lr_request); 2926 2927 if (time_before(jiffies, elr->lr_next_sched)) { 2928 if (time_before(elr->lr_next_sched, next_wakeup)) 2929 next_wakeup = elr->lr_next_sched; 2930 continue; 2931 } 2932 if (down_read_trylock(&elr->lr_super->s_umount)) { 2933 if (sb_start_write_trylock(elr->lr_super)) { 2934 progress = 1; 2935 /* 2936 * We hold sb->s_umount, sb can not 2937 * be removed from the list, it is 2938 * now safe to drop li_list_mtx 2939 */ 2940 mutex_unlock(&eli->li_list_mtx); 2941 err = ext4_run_li_request(elr); 2942 sb_end_write(elr->lr_super); 2943 mutex_lock(&eli->li_list_mtx); 2944 n = pos->next; 2945 } 2946 up_read((&elr->lr_super->s_umount)); 2947 } 2948 /* error, remove the lazy_init job */ 2949 if (err) { 2950 ext4_remove_li_request(elr); 2951 continue; 2952 } 2953 if (!progress) { 2954 elr->lr_next_sched = jiffies + 2955 (prandom_u32() 2956 % (EXT4_DEF_LI_MAX_START_DELAY * HZ)); 2957 } 2958 if (time_before(elr->lr_next_sched, next_wakeup)) 2959 next_wakeup = elr->lr_next_sched; 2960 } 2961 mutex_unlock(&eli->li_list_mtx); 2962 2963 try_to_freeze(); 2964 2965 cur = jiffies; 2966 if ((time_after_eq(cur, next_wakeup)) || 2967 (MAX_JIFFY_OFFSET == next_wakeup)) { 2968 cond_resched(); 2969 continue; 2970 } 2971 2972 schedule_timeout_interruptible(next_wakeup - cur); 2973 2974 if (kthread_should_stop()) { 2975 ext4_clear_request_list(); 2976 goto exit_thread; 2977 } 2978 } 2979 2980 exit_thread: 2981 /* 2982 * It looks like the request list is empty, but we need 2983 * to check it under the li_list_mtx lock, to prevent any 2984 * additions into it, and of course we should lock ext4_li_mtx 2985 * to atomically free the list and ext4_li_info, because at 2986 * this point another ext4 filesystem could be registering 2987 * new one. 2988 */ 2989 mutex_lock(&ext4_li_mtx); 2990 mutex_lock(&eli->li_list_mtx); 2991 if (!list_empty(&eli->li_request_list)) { 2992 mutex_unlock(&eli->li_list_mtx); 2993 mutex_unlock(&ext4_li_mtx); 2994 goto cont_thread; 2995 } 2996 mutex_unlock(&eli->li_list_mtx); 2997 kfree(ext4_li_info); 2998 ext4_li_info = NULL; 2999 mutex_unlock(&ext4_li_mtx); 3000 3001 return 0; 3002 } 3003 3004 static void ext4_clear_request_list(void) 3005 { 3006 struct list_head *pos, *n; 3007 struct ext4_li_request *elr; 3008 3009 mutex_lock(&ext4_li_info->li_list_mtx); 3010 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 3011 elr = list_entry(pos, struct ext4_li_request, 3012 lr_request); 3013 ext4_remove_li_request(elr); 3014 } 3015 mutex_unlock(&ext4_li_info->li_list_mtx); 3016 } 3017 3018 static int ext4_run_lazyinit_thread(void) 3019 { 3020 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 3021 ext4_li_info, "ext4lazyinit"); 3022 if (IS_ERR(ext4_lazyinit_task)) { 3023 int err = PTR_ERR(ext4_lazyinit_task); 3024 ext4_clear_request_list(); 3025 kfree(ext4_li_info); 3026 ext4_li_info = NULL; 3027 printk(KERN_CRIT "EXT4-fs: error %d creating inode table " 3028 "initialization thread\n", 3029 err); 3030 return err; 3031 } 3032 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 3033 return 0; 3034 } 3035 3036 /* 3037 * Check whether it make sense to run itable init. thread or not. 3038 * If there is at least one uninitialized inode table, return 3039 * corresponding group number, else the loop goes through all 3040 * groups and return total number of groups. 3041 */ 3042 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 3043 { 3044 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 3045 struct ext4_group_desc *gdp = NULL; 3046 3047 for (group = 0; group < ngroups; group++) { 3048 gdp = ext4_get_group_desc(sb, group, NULL); 3049 if (!gdp) 3050 continue; 3051 3052 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 3053 break; 3054 } 3055 3056 return group; 3057 } 3058 3059 static int ext4_li_info_new(void) 3060 { 3061 struct ext4_lazy_init *eli = NULL; 3062 3063 eli = kzalloc(sizeof(*eli), GFP_KERNEL); 3064 if (!eli) 3065 return -ENOMEM; 3066 3067 INIT_LIST_HEAD(&eli->li_request_list); 3068 mutex_init(&eli->li_list_mtx); 3069 3070 eli->li_state |= EXT4_LAZYINIT_QUIT; 3071 3072 ext4_li_info = eli; 3073 3074 return 0; 3075 } 3076 3077 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 3078 ext4_group_t start) 3079 { 3080 struct ext4_sb_info *sbi = EXT4_SB(sb); 3081 struct ext4_li_request *elr; 3082 3083 elr = kzalloc(sizeof(*elr), GFP_KERNEL); 3084 if (!elr) 3085 return NULL; 3086 3087 elr->lr_super = sb; 3088 elr->lr_sbi = sbi; 3089 elr->lr_next_group = start; 3090 3091 /* 3092 * Randomize first schedule time of the request to 3093 * spread the inode table initialization requests 3094 * better. 3095 */ 3096 elr->lr_next_sched = jiffies + (prandom_u32() % 3097 (EXT4_DEF_LI_MAX_START_DELAY * HZ)); 3098 return elr; 3099 } 3100 3101 int ext4_register_li_request(struct super_block *sb, 3102 ext4_group_t first_not_zeroed) 3103 { 3104 struct ext4_sb_info *sbi = EXT4_SB(sb); 3105 struct ext4_li_request *elr = NULL; 3106 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3107 int ret = 0; 3108 3109 mutex_lock(&ext4_li_mtx); 3110 if (sbi->s_li_request != NULL) { 3111 /* 3112 * Reset timeout so it can be computed again, because 3113 * s_li_wait_mult might have changed. 3114 */ 3115 sbi->s_li_request->lr_timeout = 0; 3116 goto out; 3117 } 3118 3119 if (first_not_zeroed == ngroups || 3120 (sb->s_flags & MS_RDONLY) || 3121 !test_opt(sb, INIT_INODE_TABLE)) 3122 goto out; 3123 3124 elr = ext4_li_request_new(sb, first_not_zeroed); 3125 if (!elr) { 3126 ret = -ENOMEM; 3127 goto out; 3128 } 3129 3130 if (NULL == ext4_li_info) { 3131 ret = ext4_li_info_new(); 3132 if (ret) 3133 goto out; 3134 } 3135 3136 mutex_lock(&ext4_li_info->li_list_mtx); 3137 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 3138 mutex_unlock(&ext4_li_info->li_list_mtx); 3139 3140 sbi->s_li_request = elr; 3141 /* 3142 * set elr to NULL here since it has been inserted to 3143 * the request_list and the removal and free of it is 3144 * handled by ext4_clear_request_list from now on. 3145 */ 3146 elr = NULL; 3147 3148 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 3149 ret = ext4_run_lazyinit_thread(); 3150 if (ret) 3151 goto out; 3152 } 3153 out: 3154 mutex_unlock(&ext4_li_mtx); 3155 if (ret) 3156 kfree(elr); 3157 return ret; 3158 } 3159 3160 /* 3161 * We do not need to lock anything since this is called on 3162 * module unload. 3163 */ 3164 static void ext4_destroy_lazyinit_thread(void) 3165 { 3166 /* 3167 * If thread exited earlier 3168 * there's nothing to be done. 3169 */ 3170 if (!ext4_li_info || !ext4_lazyinit_task) 3171 return; 3172 3173 kthread_stop(ext4_lazyinit_task); 3174 } 3175 3176 static int set_journal_csum_feature_set(struct super_block *sb) 3177 { 3178 int ret = 1; 3179 int compat, incompat; 3180 struct ext4_sb_info *sbi = EXT4_SB(sb); 3181 3182 if (ext4_has_metadata_csum(sb)) { 3183 /* journal checksum v3 */ 3184 compat = 0; 3185 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; 3186 } else { 3187 /* journal checksum v1 */ 3188 compat = JBD2_FEATURE_COMPAT_CHECKSUM; 3189 incompat = 0; 3190 } 3191 3192 jbd2_journal_clear_features(sbi->s_journal, 3193 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3194 JBD2_FEATURE_INCOMPAT_CSUM_V3 | 3195 JBD2_FEATURE_INCOMPAT_CSUM_V2); 3196 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3197 ret = jbd2_journal_set_features(sbi->s_journal, 3198 compat, 0, 3199 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 3200 incompat); 3201 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 3202 ret = jbd2_journal_set_features(sbi->s_journal, 3203 compat, 0, 3204 incompat); 3205 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3206 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3207 } else { 3208 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3209 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3210 } 3211 3212 return ret; 3213 } 3214 3215 /* 3216 * Note: calculating the overhead so we can be compatible with 3217 * historical BSD practice is quite difficult in the face of 3218 * clusters/bigalloc. This is because multiple metadata blocks from 3219 * different block group can end up in the same allocation cluster. 3220 * Calculating the exact overhead in the face of clustered allocation 3221 * requires either O(all block bitmaps) in memory or O(number of block 3222 * groups**2) in time. We will still calculate the superblock for 3223 * older file systems --- and if we come across with a bigalloc file 3224 * system with zero in s_overhead_clusters the estimate will be close to 3225 * correct especially for very large cluster sizes --- but for newer 3226 * file systems, it's better to calculate this figure once at mkfs 3227 * time, and store it in the superblock. If the superblock value is 3228 * present (even for non-bigalloc file systems), we will use it. 3229 */ 3230 static int count_overhead(struct super_block *sb, ext4_group_t grp, 3231 char *buf) 3232 { 3233 struct ext4_sb_info *sbi = EXT4_SB(sb); 3234 struct ext4_group_desc *gdp; 3235 ext4_fsblk_t first_block, last_block, b; 3236 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3237 int s, j, count = 0; 3238 3239 if (!ext4_has_feature_bigalloc(sb)) 3240 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + 3241 sbi->s_itb_per_group + 2); 3242 3243 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + 3244 (grp * EXT4_BLOCKS_PER_GROUP(sb)); 3245 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; 3246 for (i = 0; i < ngroups; i++) { 3247 gdp = ext4_get_group_desc(sb, i, NULL); 3248 b = ext4_block_bitmap(sb, gdp); 3249 if (b >= first_block && b <= last_block) { 3250 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3251 count++; 3252 } 3253 b = ext4_inode_bitmap(sb, gdp); 3254 if (b >= first_block && b <= last_block) { 3255 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3256 count++; 3257 } 3258 b = ext4_inode_table(sb, gdp); 3259 if (b >= first_block && b + sbi->s_itb_per_group <= last_block) 3260 for (j = 0; j < sbi->s_itb_per_group; j++, b++) { 3261 int c = EXT4_B2C(sbi, b - first_block); 3262 ext4_set_bit(c, buf); 3263 count++; 3264 } 3265 if (i != grp) 3266 continue; 3267 s = 0; 3268 if (ext4_bg_has_super(sb, grp)) { 3269 ext4_set_bit(s++, buf); 3270 count++; 3271 } 3272 j = ext4_bg_num_gdb(sb, grp); 3273 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) { 3274 ext4_error(sb, "Invalid number of block group " 3275 "descriptor blocks: %d", j); 3276 j = EXT4_BLOCKS_PER_GROUP(sb) - s; 3277 } 3278 count += j; 3279 for (; j > 0; j--) 3280 ext4_set_bit(EXT4_B2C(sbi, s++), buf); 3281 } 3282 if (!count) 3283 return 0; 3284 return EXT4_CLUSTERS_PER_GROUP(sb) - 3285 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); 3286 } 3287 3288 /* 3289 * Compute the overhead and stash it in sbi->s_overhead 3290 */ 3291 int ext4_calculate_overhead(struct super_block *sb) 3292 { 3293 struct ext4_sb_info *sbi = EXT4_SB(sb); 3294 struct ext4_super_block *es = sbi->s_es; 3295 struct inode *j_inode; 3296 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum); 3297 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3298 ext4_fsblk_t overhead = 0; 3299 char *buf = (char *) get_zeroed_page(GFP_NOFS); 3300 3301 if (!buf) 3302 return -ENOMEM; 3303 3304 /* 3305 * Compute the overhead (FS structures). This is constant 3306 * for a given filesystem unless the number of block groups 3307 * changes so we cache the previous value until it does. 3308 */ 3309 3310 /* 3311 * All of the blocks before first_data_block are overhead 3312 */ 3313 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 3314 3315 /* 3316 * Add the overhead found in each block group 3317 */ 3318 for (i = 0; i < ngroups; i++) { 3319 int blks; 3320 3321 blks = count_overhead(sb, i, buf); 3322 overhead += blks; 3323 if (blks) 3324 memset(buf, 0, PAGE_SIZE); 3325 cond_resched(); 3326 } 3327 3328 /* 3329 * Add the internal journal blocks whether the journal has been 3330 * loaded or not 3331 */ 3332 if (sbi->s_journal && !sbi->journal_bdev) 3333 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); 3334 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) { 3335 j_inode = ext4_get_journal_inode(sb, j_inum); 3336 if (j_inode) { 3337 j_blocks = j_inode->i_size >> sb->s_blocksize_bits; 3338 overhead += EXT4_NUM_B2C(sbi, j_blocks); 3339 iput(j_inode); 3340 } else { 3341 ext4_msg(sb, KERN_ERR, "can't get journal size"); 3342 } 3343 } 3344 sbi->s_overhead = overhead; 3345 smp_wmb(); 3346 free_page((unsigned long) buf); 3347 return 0; 3348 } 3349 3350 static void ext4_set_resv_clusters(struct super_block *sb) 3351 { 3352 ext4_fsblk_t resv_clusters; 3353 struct ext4_sb_info *sbi = EXT4_SB(sb); 3354 3355 /* 3356 * There's no need to reserve anything when we aren't using extents. 3357 * The space estimates are exact, there are no unwritten extents, 3358 * hole punching doesn't need new metadata... This is needed especially 3359 * to keep ext2/3 backward compatibility. 3360 */ 3361 if (!ext4_has_feature_extents(sb)) 3362 return; 3363 /* 3364 * By default we reserve 2% or 4096 clusters, whichever is smaller. 3365 * This should cover the situations where we can not afford to run 3366 * out of space like for example punch hole, or converting 3367 * unwritten extents in delalloc path. In most cases such 3368 * allocation would require 1, or 2 blocks, higher numbers are 3369 * very rare. 3370 */ 3371 resv_clusters = (ext4_blocks_count(sbi->s_es) >> 3372 sbi->s_cluster_bits); 3373 3374 do_div(resv_clusters, 50); 3375 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); 3376 3377 atomic64_set(&sbi->s_resv_clusters, resv_clusters); 3378 } 3379 3380 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3381 { 3382 char *orig_data = kstrdup(data, GFP_KERNEL); 3383 struct buffer_head *bh; 3384 struct ext4_super_block *es = NULL; 3385 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3386 ext4_fsblk_t block; 3387 ext4_fsblk_t sb_block = get_sb_block(&data); 3388 ext4_fsblk_t logical_sb_block; 3389 unsigned long offset = 0; 3390 unsigned long journal_devnum = 0; 3391 unsigned long def_mount_opts; 3392 struct inode *root; 3393 const char *descr; 3394 int ret = -ENOMEM; 3395 int blocksize, clustersize; 3396 unsigned int db_count; 3397 unsigned int i; 3398 int needs_recovery, has_huge_files, has_bigalloc; 3399 __u64 blocks_count; 3400 int err = 0; 3401 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3402 ext4_group_t first_not_zeroed; 3403 3404 if ((data && !orig_data) || !sbi) 3405 goto out_free_base; 3406 3407 sbi->s_blockgroup_lock = 3408 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3409 if (!sbi->s_blockgroup_lock) 3410 goto out_free_base; 3411 3412 sb->s_fs_info = sbi; 3413 sbi->s_sb = sb; 3414 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3415 sbi->s_sb_block = sb_block; 3416 if (sb->s_bdev->bd_part) 3417 sbi->s_sectors_written_start = 3418 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3419 3420 /* Cleanup superblock name */ 3421 strreplace(sb->s_id, '/', '!'); 3422 3423 /* -EINVAL is default */ 3424 ret = -EINVAL; 3425 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3426 if (!blocksize) { 3427 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3428 goto out_fail; 3429 } 3430 3431 /* 3432 * The ext4 superblock will not be buffer aligned for other than 1kB 3433 * block sizes. We need to calculate the offset from buffer start. 3434 */ 3435 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 3436 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3437 offset = do_div(logical_sb_block, blocksize); 3438 } else { 3439 logical_sb_block = sb_block; 3440 } 3441 3442 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) { 3443 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3444 goto out_fail; 3445 } 3446 /* 3447 * Note: s_es must be initialized as soon as possible because 3448 * some ext4 macro-instructions depend on its value 3449 */ 3450 es = (struct ext4_super_block *) (bh->b_data + offset); 3451 sbi->s_es = es; 3452 sb->s_magic = le16_to_cpu(es->s_magic); 3453 if (sb->s_magic != EXT4_SUPER_MAGIC) 3454 goto cantfind_ext4; 3455 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3456 3457 /* Warn if metadata_csum and gdt_csum are both set. */ 3458 if (ext4_has_feature_metadata_csum(sb) && 3459 ext4_has_feature_gdt_csum(sb)) 3460 ext4_warning(sb, "metadata_csum and uninit_bg are " 3461 "redundant flags; please run fsck."); 3462 3463 /* Check for a known checksum algorithm */ 3464 if (!ext4_verify_csum_type(sb, es)) { 3465 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3466 "unknown checksum algorithm."); 3467 silent = 1; 3468 goto cantfind_ext4; 3469 } 3470 3471 /* Load the checksum driver */ 3472 if (ext4_has_feature_metadata_csum(sb) || 3473 ext4_has_feature_ea_inode(sb)) { 3474 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 3475 if (IS_ERR(sbi->s_chksum_driver)) { 3476 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); 3477 ret = PTR_ERR(sbi->s_chksum_driver); 3478 sbi->s_chksum_driver = NULL; 3479 goto failed_mount; 3480 } 3481 } 3482 3483 /* Check superblock checksum */ 3484 if (!ext4_superblock_csum_verify(sb, es)) { 3485 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3486 "invalid superblock checksum. Run e2fsck?"); 3487 silent = 1; 3488 ret = -EFSBADCRC; 3489 goto cantfind_ext4; 3490 } 3491 3492 /* Precompute checksum seed for all metadata */ 3493 if (ext4_has_feature_csum_seed(sb)) 3494 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed); 3495 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb)) 3496 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, 3497 sizeof(es->s_uuid)); 3498 3499 /* Set defaults before we parse the mount options */ 3500 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3501 set_opt(sb, INIT_INODE_TABLE); 3502 if (def_mount_opts & EXT4_DEFM_DEBUG) 3503 set_opt(sb, DEBUG); 3504 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 3505 set_opt(sb, GRPID); 3506 if (def_mount_opts & EXT4_DEFM_UID16) 3507 set_opt(sb, NO_UID32); 3508 /* xattr user namespace & acls are now defaulted on */ 3509 set_opt(sb, XATTR_USER); 3510 #ifdef CONFIG_EXT4_FS_POSIX_ACL 3511 set_opt(sb, POSIX_ACL); 3512 #endif 3513 /* don't forget to enable journal_csum when metadata_csum is enabled. */ 3514 if (ext4_has_metadata_csum(sb)) 3515 set_opt(sb, JOURNAL_CHECKSUM); 3516 3517 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3518 set_opt(sb, JOURNAL_DATA); 3519 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3520 set_opt(sb, ORDERED_DATA); 3521 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3522 set_opt(sb, WRITEBACK_DATA); 3523 3524 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3525 set_opt(sb, ERRORS_PANIC); 3526 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3527 set_opt(sb, ERRORS_CONT); 3528 else 3529 set_opt(sb, ERRORS_RO); 3530 /* block_validity enabled by default; disable with noblock_validity */ 3531 set_opt(sb, BLOCK_VALIDITY); 3532 if (def_mount_opts & EXT4_DEFM_DISCARD) 3533 set_opt(sb, DISCARD); 3534 3535 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 3536 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 3537 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 3538 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 3539 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3540 3541 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3542 set_opt(sb, BARRIER); 3543 3544 /* 3545 * enable delayed allocation by default 3546 * Use -o nodelalloc to turn it off 3547 */ 3548 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && 3549 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3550 set_opt(sb, DELALLOC); 3551 3552 /* 3553 * set default s_li_wait_mult for lazyinit, for the case there is 3554 * no mount option specified. 3555 */ 3556 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 3557 3558 if (sbi->s_es->s_mount_opts[0]) { 3559 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts, 3560 sizeof(sbi->s_es->s_mount_opts), 3561 GFP_KERNEL); 3562 if (!s_mount_opts) 3563 goto failed_mount; 3564 if (!parse_options(s_mount_opts, sb, &journal_devnum, 3565 &journal_ioprio, 0)) { 3566 ext4_msg(sb, KERN_WARNING, 3567 "failed to parse options in superblock: %s", 3568 s_mount_opts); 3569 } 3570 kfree(s_mount_opts); 3571 } 3572 sbi->s_def_mount_opt = sbi->s_mount_opt; 3573 if (!parse_options((char *) data, sb, &journal_devnum, 3574 &journal_ioprio, 0)) 3575 goto failed_mount; 3576 3577 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3578 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " 3579 "with data=journal disables delayed " 3580 "allocation and O_DIRECT support!\n"); 3581 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 3582 ext4_msg(sb, KERN_ERR, "can't mount with " 3583 "both data=journal and delalloc"); 3584 goto failed_mount; 3585 } 3586 if (test_opt(sb, DIOREAD_NOLOCK)) { 3587 ext4_msg(sb, KERN_ERR, "can't mount with " 3588 "both data=journal and dioread_nolock"); 3589 goto failed_mount; 3590 } 3591 if (test_opt(sb, DAX)) { 3592 ext4_msg(sb, KERN_ERR, "can't mount with " 3593 "both data=journal and dax"); 3594 goto failed_mount; 3595 } 3596 if (ext4_has_feature_encrypt(sb)) { 3597 ext4_msg(sb, KERN_WARNING, 3598 "encrypted files will use data=ordered " 3599 "instead of data journaling mode"); 3600 } 3601 if (test_opt(sb, DELALLOC)) 3602 clear_opt(sb, DELALLOC); 3603 } else { 3604 sb->s_iflags |= SB_I_CGROUPWB; 3605 } 3606 3607 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3608 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3609 3610 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3611 (ext4_has_compat_features(sb) || 3612 ext4_has_ro_compat_features(sb) || 3613 ext4_has_incompat_features(sb))) 3614 ext4_msg(sb, KERN_WARNING, 3615 "feature flags set on rev 0 fs, " 3616 "running e2fsck is recommended"); 3617 3618 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { 3619 set_opt2(sb, HURD_COMPAT); 3620 if (ext4_has_feature_64bit(sb)) { 3621 ext4_msg(sb, KERN_ERR, 3622 "The Hurd can't support 64-bit file systems"); 3623 goto failed_mount; 3624 } 3625 3626 /* 3627 * ea_inode feature uses l_i_version field which is not 3628 * available in HURD_COMPAT mode. 3629 */ 3630 if (ext4_has_feature_ea_inode(sb)) { 3631 ext4_msg(sb, KERN_ERR, 3632 "ea_inode feature is not supported for Hurd"); 3633 goto failed_mount; 3634 } 3635 } 3636 3637 if (IS_EXT2_SB(sb)) { 3638 if (ext2_feature_set_ok(sb)) 3639 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 3640 "using the ext4 subsystem"); 3641 else { 3642 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 3643 "to feature incompatibilities"); 3644 goto failed_mount; 3645 } 3646 } 3647 3648 if (IS_EXT3_SB(sb)) { 3649 if (ext3_feature_set_ok(sb)) 3650 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 3651 "using the ext4 subsystem"); 3652 else { 3653 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 3654 "to feature incompatibilities"); 3655 goto failed_mount; 3656 } 3657 } 3658 3659 /* 3660 * Check feature flags regardless of the revision level, since we 3661 * previously didn't change the revision level when setting the flags, 3662 * so there is a chance incompat flags are set on a rev 0 filesystem. 3663 */ 3664 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3665 goto failed_mount; 3666 3667 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 3668 if (blocksize < EXT4_MIN_BLOCK_SIZE || 3669 blocksize > EXT4_MAX_BLOCK_SIZE) { 3670 ext4_msg(sb, KERN_ERR, 3671 "Unsupported filesystem blocksize %d (%d log_block_size)", 3672 blocksize, le32_to_cpu(es->s_log_block_size)); 3673 goto failed_mount; 3674 } 3675 if (le32_to_cpu(es->s_log_block_size) > 3676 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { 3677 ext4_msg(sb, KERN_ERR, 3678 "Invalid log block size: %u", 3679 le32_to_cpu(es->s_log_block_size)); 3680 goto failed_mount; 3681 } 3682 3683 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) { 3684 ext4_msg(sb, KERN_ERR, 3685 "Number of reserved GDT blocks insanely large: %d", 3686 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks)); 3687 goto failed_mount; 3688 } 3689 3690 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { 3691 err = bdev_dax_supported(sb, blocksize); 3692 if (err) 3693 goto failed_mount; 3694 } 3695 3696 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { 3697 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", 3698 es->s_encryption_level); 3699 goto failed_mount; 3700 } 3701 3702 if (sb->s_blocksize != blocksize) { 3703 /* Validate the filesystem blocksize */ 3704 if (!sb_set_blocksize(sb, blocksize)) { 3705 ext4_msg(sb, KERN_ERR, "bad block size %d", 3706 blocksize); 3707 goto failed_mount; 3708 } 3709 3710 brelse(bh); 3711 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3712 offset = do_div(logical_sb_block, blocksize); 3713 bh = sb_bread_unmovable(sb, logical_sb_block); 3714 if (!bh) { 3715 ext4_msg(sb, KERN_ERR, 3716 "Can't read superblock on 2nd try"); 3717 goto failed_mount; 3718 } 3719 es = (struct ext4_super_block *)(bh->b_data + offset); 3720 sbi->s_es = es; 3721 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3722 ext4_msg(sb, KERN_ERR, 3723 "Magic mismatch, very weird!"); 3724 goto failed_mount; 3725 } 3726 } 3727 3728 has_huge_files = ext4_has_feature_huge_file(sb); 3729 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3730 has_huge_files); 3731 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3732 3733 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3734 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3735 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3736 } else { 3737 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3738 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3739 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 3740 (!is_power_of_2(sbi->s_inode_size)) || 3741 (sbi->s_inode_size > blocksize)) { 3742 ext4_msg(sb, KERN_ERR, 3743 "unsupported inode size: %d", 3744 sbi->s_inode_size); 3745 goto failed_mount; 3746 } 3747 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3748 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3749 } 3750 3751 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 3752 if (ext4_has_feature_64bit(sb)) { 3753 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 3754 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3755 !is_power_of_2(sbi->s_desc_size)) { 3756 ext4_msg(sb, KERN_ERR, 3757 "unsupported descriptor size %lu", 3758 sbi->s_desc_size); 3759 goto failed_mount; 3760 } 3761 } else 3762 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 3763 3764 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3765 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3766 3767 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3768 if (sbi->s_inodes_per_block == 0) 3769 goto cantfind_ext4; 3770 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || 3771 sbi->s_inodes_per_group > blocksize * 8) { 3772 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n", 3773 sbi->s_blocks_per_group); 3774 goto failed_mount; 3775 } 3776 sbi->s_itb_per_group = sbi->s_inodes_per_group / 3777 sbi->s_inodes_per_block; 3778 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3779 sbi->s_sbh = bh; 3780 sbi->s_mount_state = le16_to_cpu(es->s_state); 3781 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3782 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 3783 3784 for (i = 0; i < 4; i++) 3785 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3786 sbi->s_def_hash_version = es->s_def_hash_version; 3787 if (ext4_has_feature_dir_index(sb)) { 3788 i = le32_to_cpu(es->s_flags); 3789 if (i & EXT2_FLAGS_UNSIGNED_HASH) 3790 sbi->s_hash_unsigned = 3; 3791 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3792 #ifdef __CHAR_UNSIGNED__ 3793 if (!(sb->s_flags & MS_RDONLY)) 3794 es->s_flags |= 3795 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3796 sbi->s_hash_unsigned = 3; 3797 #else 3798 if (!(sb->s_flags & MS_RDONLY)) 3799 es->s_flags |= 3800 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3801 #endif 3802 } 3803 } 3804 3805 /* Handle clustersize */ 3806 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 3807 has_bigalloc = ext4_has_feature_bigalloc(sb); 3808 if (has_bigalloc) { 3809 if (clustersize < blocksize) { 3810 ext4_msg(sb, KERN_ERR, 3811 "cluster size (%d) smaller than " 3812 "block size (%d)", clustersize, blocksize); 3813 goto failed_mount; 3814 } 3815 if (le32_to_cpu(es->s_log_cluster_size) > 3816 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { 3817 ext4_msg(sb, KERN_ERR, 3818 "Invalid log cluster size: %u", 3819 le32_to_cpu(es->s_log_cluster_size)); 3820 goto failed_mount; 3821 } 3822 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 3823 le32_to_cpu(es->s_log_block_size); 3824 sbi->s_clusters_per_group = 3825 le32_to_cpu(es->s_clusters_per_group); 3826 if (sbi->s_clusters_per_group > blocksize * 8) { 3827 ext4_msg(sb, KERN_ERR, 3828 "#clusters per group too big: %lu", 3829 sbi->s_clusters_per_group); 3830 goto failed_mount; 3831 } 3832 if (sbi->s_blocks_per_group != 3833 (sbi->s_clusters_per_group * (clustersize / blocksize))) { 3834 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " 3835 "clusters per group (%lu) inconsistent", 3836 sbi->s_blocks_per_group, 3837 sbi->s_clusters_per_group); 3838 goto failed_mount; 3839 } 3840 } else { 3841 if (clustersize != blocksize) { 3842 ext4_warning(sb, "fragment/cluster size (%d) != " 3843 "block size (%d)", clustersize, 3844 blocksize); 3845 clustersize = blocksize; 3846 } 3847 if (sbi->s_blocks_per_group > blocksize * 8) { 3848 ext4_msg(sb, KERN_ERR, 3849 "#blocks per group too big: %lu", 3850 sbi->s_blocks_per_group); 3851 goto failed_mount; 3852 } 3853 sbi->s_clusters_per_group = sbi->s_blocks_per_group; 3854 sbi->s_cluster_bits = 0; 3855 } 3856 sbi->s_cluster_ratio = clustersize / blocksize; 3857 3858 /* Do we have standard group size of clustersize * 8 blocks ? */ 3859 if (sbi->s_blocks_per_group == clustersize << 3) 3860 set_opt2(sb, STD_GROUP_SIZE); 3861 3862 /* 3863 * Test whether we have more sectors than will fit in sector_t, 3864 * and whether the max offset is addressable by the page cache. 3865 */ 3866 err = generic_check_addressable(sb->s_blocksize_bits, 3867 ext4_blocks_count(es)); 3868 if (err) { 3869 ext4_msg(sb, KERN_ERR, "filesystem" 3870 " too large to mount safely on this system"); 3871 if (sizeof(sector_t) < 8) 3872 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 3873 goto failed_mount; 3874 } 3875 3876 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3877 goto cantfind_ext4; 3878 3879 /* check blocks count against device size */ 3880 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 3881 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3882 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3883 "exceeds size of device (%llu blocks)", 3884 ext4_blocks_count(es), blocks_count); 3885 goto failed_mount; 3886 } 3887 3888 /* 3889 * It makes no sense for the first data block to be beyond the end 3890 * of the filesystem. 3891 */ 3892 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3893 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 3894 "block %u is beyond end of filesystem (%llu)", 3895 le32_to_cpu(es->s_first_data_block), 3896 ext4_blocks_count(es)); 3897 goto failed_mount; 3898 } 3899 blocks_count = (ext4_blocks_count(es) - 3900 le32_to_cpu(es->s_first_data_block) + 3901 EXT4_BLOCKS_PER_GROUP(sb) - 1); 3902 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 3903 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3904 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 3905 "(block count %llu, first data block %u, " 3906 "blocks per group %lu)", sbi->s_groups_count, 3907 ext4_blocks_count(es), 3908 le32_to_cpu(es->s_first_data_block), 3909 EXT4_BLOCKS_PER_GROUP(sb)); 3910 goto failed_mount; 3911 } 3912 sbi->s_groups_count = blocks_count; 3913 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3914 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3915 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3916 EXT4_DESC_PER_BLOCK(sb); 3917 if (ext4_has_feature_meta_bg(sb)) { 3918 if (le32_to_cpu(es->s_first_meta_bg) > db_count) { 3919 ext4_msg(sb, KERN_WARNING, 3920 "first meta block group too large: %u " 3921 "(group descriptor block count %u)", 3922 le32_to_cpu(es->s_first_meta_bg), db_count); 3923 goto failed_mount; 3924 } 3925 } 3926 sbi->s_group_desc = kvmalloc(db_count * 3927 sizeof(struct buffer_head *), 3928 GFP_KERNEL); 3929 if (sbi->s_group_desc == NULL) { 3930 ext4_msg(sb, KERN_ERR, "not enough memory"); 3931 ret = -ENOMEM; 3932 goto failed_mount; 3933 } 3934 3935 bgl_lock_init(sbi->s_blockgroup_lock); 3936 3937 /* Pre-read the descriptors into the buffer cache */ 3938 for (i = 0; i < db_count; i++) { 3939 block = descriptor_loc(sb, logical_sb_block, i); 3940 sb_breadahead(sb, block); 3941 } 3942 3943 for (i = 0; i < db_count; i++) { 3944 block = descriptor_loc(sb, logical_sb_block, i); 3945 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block); 3946 if (!sbi->s_group_desc[i]) { 3947 ext4_msg(sb, KERN_ERR, 3948 "can't read group descriptor %d", i); 3949 db_count = i; 3950 goto failed_mount2; 3951 } 3952 } 3953 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) { 3954 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3955 ret = -EFSCORRUPTED; 3956 goto failed_mount2; 3957 } 3958 3959 sbi->s_gdb_count = db_count; 3960 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3961 spin_lock_init(&sbi->s_next_gen_lock); 3962 3963 setup_timer(&sbi->s_err_report, print_daily_error_info, 3964 (unsigned long) sb); 3965 3966 /* Register extent status tree shrinker */ 3967 if (ext4_es_register_shrinker(sbi)) 3968 goto failed_mount3; 3969 3970 sbi->s_stripe = ext4_get_stripe_size(sbi); 3971 sbi->s_extent_max_zeroout_kb = 32; 3972 3973 /* 3974 * set up enough so that it can read an inode 3975 */ 3976 sb->s_op = &ext4_sops; 3977 sb->s_export_op = &ext4_export_ops; 3978 sb->s_xattr = ext4_xattr_handlers; 3979 sb->s_cop = &ext4_cryptops; 3980 #ifdef CONFIG_QUOTA 3981 sb->dq_op = &ext4_quota_operations; 3982 if (ext4_has_feature_quota(sb)) 3983 sb->s_qcop = &dquot_quotactl_sysfile_ops; 3984 else 3985 sb->s_qcop = &ext4_qctl_operations; 3986 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; 3987 #endif 3988 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3989 3990 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 3991 mutex_init(&sbi->s_orphan_lock); 3992 3993 sb->s_root = NULL; 3994 3995 needs_recovery = (es->s_last_orphan != 0 || 3996 ext4_has_feature_journal_needs_recovery(sb)); 3997 3998 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY)) 3999 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 4000 goto failed_mount3a; 4001 4002 /* 4003 * The first inode we look at is the journal inode. Don't try 4004 * root first: it may be modified in the journal! 4005 */ 4006 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { 4007 err = ext4_load_journal(sb, es, journal_devnum); 4008 if (err) 4009 goto failed_mount3a; 4010 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 4011 ext4_has_feature_journal_needs_recovery(sb)) { 4012 ext4_msg(sb, KERN_ERR, "required journal recovery " 4013 "suppressed and not mounted read-only"); 4014 goto failed_mount_wq; 4015 } else { 4016 /* Nojournal mode, all journal mount options are illegal */ 4017 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) { 4018 ext4_msg(sb, KERN_ERR, "can't mount with " 4019 "journal_checksum, fs mounted w/o journal"); 4020 goto failed_mount_wq; 4021 } 4022 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 4023 ext4_msg(sb, KERN_ERR, "can't mount with " 4024 "journal_async_commit, fs mounted w/o journal"); 4025 goto failed_mount_wq; 4026 } 4027 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 4028 ext4_msg(sb, KERN_ERR, "can't mount with " 4029 "commit=%lu, fs mounted w/o journal", 4030 sbi->s_commit_interval / HZ); 4031 goto failed_mount_wq; 4032 } 4033 if (EXT4_MOUNT_DATA_FLAGS & 4034 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { 4035 ext4_msg(sb, KERN_ERR, "can't mount with " 4036 "data=, fs mounted w/o journal"); 4037 goto failed_mount_wq; 4038 } 4039 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM; 4040 clear_opt(sb, JOURNAL_CHECKSUM); 4041 clear_opt(sb, DATA_FLAGS); 4042 sbi->s_journal = NULL; 4043 needs_recovery = 0; 4044 goto no_journal; 4045 } 4046 4047 if (ext4_has_feature_64bit(sb) && 4048 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 4049 JBD2_FEATURE_INCOMPAT_64BIT)) { 4050 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 4051 goto failed_mount_wq; 4052 } 4053 4054 if (!set_journal_csum_feature_set(sb)) { 4055 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " 4056 "feature set"); 4057 goto failed_mount_wq; 4058 } 4059 4060 /* We have now updated the journal if required, so we can 4061 * validate the data journaling mode. */ 4062 switch (test_opt(sb, DATA_FLAGS)) { 4063 case 0: 4064 /* No mode set, assume a default based on the journal 4065 * capabilities: ORDERED_DATA if the journal can 4066 * cope, else JOURNAL_DATA 4067 */ 4068 if (jbd2_journal_check_available_features 4069 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 4070 set_opt(sb, ORDERED_DATA); 4071 else 4072 set_opt(sb, JOURNAL_DATA); 4073 break; 4074 4075 case EXT4_MOUNT_ORDERED_DATA: 4076 case EXT4_MOUNT_WRITEBACK_DATA: 4077 if (!jbd2_journal_check_available_features 4078 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 4079 ext4_msg(sb, KERN_ERR, "Journal does not support " 4080 "requested data journaling mode"); 4081 goto failed_mount_wq; 4082 } 4083 default: 4084 break; 4085 } 4086 4087 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && 4088 test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 4089 ext4_msg(sb, KERN_ERR, "can't mount with " 4090 "journal_async_commit in data=ordered mode"); 4091 goto failed_mount_wq; 4092 } 4093 4094 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4095 4096 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; 4097 4098 no_journal: 4099 if (!test_opt(sb, NO_MBCACHE)) { 4100 sbi->s_ea_block_cache = ext4_xattr_create_cache(); 4101 if (!sbi->s_ea_block_cache) { 4102 ext4_msg(sb, KERN_ERR, 4103 "Failed to create ea_block_cache"); 4104 goto failed_mount_wq; 4105 } 4106 4107 if (ext4_has_feature_ea_inode(sb)) { 4108 sbi->s_ea_inode_cache = ext4_xattr_create_cache(); 4109 if (!sbi->s_ea_inode_cache) { 4110 ext4_msg(sb, KERN_ERR, 4111 "Failed to create ea_inode_cache"); 4112 goto failed_mount_wq; 4113 } 4114 } 4115 } 4116 4117 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) && 4118 (blocksize != PAGE_SIZE)) { 4119 ext4_msg(sb, KERN_ERR, 4120 "Unsupported blocksize for fs encryption"); 4121 goto failed_mount_wq; 4122 } 4123 4124 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) && 4125 !ext4_has_feature_encrypt(sb)) { 4126 ext4_set_feature_encrypt(sb); 4127 ext4_commit_super(sb, 1); 4128 } 4129 4130 /* 4131 * Get the # of file system overhead blocks from the 4132 * superblock if present. 4133 */ 4134 if (es->s_overhead_clusters) 4135 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); 4136 else { 4137 err = ext4_calculate_overhead(sb); 4138 if (err) 4139 goto failed_mount_wq; 4140 } 4141 4142 /* 4143 * The maximum number of concurrent works can be high and 4144 * concurrency isn't really necessary. Limit it to 1. 4145 */ 4146 EXT4_SB(sb)->rsv_conversion_wq = 4147 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 4148 if (!EXT4_SB(sb)->rsv_conversion_wq) { 4149 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); 4150 ret = -ENOMEM; 4151 goto failed_mount4; 4152 } 4153 4154 /* 4155 * The jbd2_journal_load will have done any necessary log recovery, 4156 * so we can safely mount the rest of the filesystem now. 4157 */ 4158 4159 root = ext4_iget(sb, EXT4_ROOT_INO); 4160 if (IS_ERR(root)) { 4161 ext4_msg(sb, KERN_ERR, "get root inode failed"); 4162 ret = PTR_ERR(root); 4163 root = NULL; 4164 goto failed_mount4; 4165 } 4166 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 4167 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 4168 iput(root); 4169 goto failed_mount4; 4170 } 4171 sb->s_root = d_make_root(root); 4172 if (!sb->s_root) { 4173 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 4174 ret = -ENOMEM; 4175 goto failed_mount4; 4176 } 4177 4178 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) 4179 sb->s_flags |= MS_RDONLY; 4180 4181 /* determine the minimum size of new large inodes, if present */ 4182 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE && 4183 sbi->s_want_extra_isize == 0) { 4184 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 4185 EXT4_GOOD_OLD_INODE_SIZE; 4186 if (ext4_has_feature_extra_isize(sb)) { 4187 if (sbi->s_want_extra_isize < 4188 le16_to_cpu(es->s_want_extra_isize)) 4189 sbi->s_want_extra_isize = 4190 le16_to_cpu(es->s_want_extra_isize); 4191 if (sbi->s_want_extra_isize < 4192 le16_to_cpu(es->s_min_extra_isize)) 4193 sbi->s_want_extra_isize = 4194 le16_to_cpu(es->s_min_extra_isize); 4195 } 4196 } 4197 /* Check if enough inode space is available */ 4198 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 4199 sbi->s_inode_size) { 4200 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 4201 EXT4_GOOD_OLD_INODE_SIZE; 4202 ext4_msg(sb, KERN_INFO, "required extra inode space not" 4203 "available"); 4204 } 4205 4206 ext4_set_resv_clusters(sb); 4207 4208 err = ext4_setup_system_zone(sb); 4209 if (err) { 4210 ext4_msg(sb, KERN_ERR, "failed to initialize system " 4211 "zone (%d)", err); 4212 goto failed_mount4a; 4213 } 4214 4215 ext4_ext_init(sb); 4216 err = ext4_mb_init(sb); 4217 if (err) { 4218 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 4219 err); 4220 goto failed_mount5; 4221 } 4222 4223 block = ext4_count_free_clusters(sb); 4224 ext4_free_blocks_count_set(sbi->s_es, 4225 EXT4_C2B(sbi, block)); 4226 err = percpu_counter_init(&sbi->s_freeclusters_counter, block, 4227 GFP_KERNEL); 4228 if (!err) { 4229 unsigned long freei = ext4_count_free_inodes(sb); 4230 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); 4231 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, 4232 GFP_KERNEL); 4233 } 4234 if (!err) 4235 err = percpu_counter_init(&sbi->s_dirs_counter, 4236 ext4_count_dirs(sb), GFP_KERNEL); 4237 if (!err) 4238 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, 4239 GFP_KERNEL); 4240 if (!err) 4241 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem); 4242 4243 if (err) { 4244 ext4_msg(sb, KERN_ERR, "insufficient memory"); 4245 goto failed_mount6; 4246 } 4247 4248 if (ext4_has_feature_flex_bg(sb)) 4249 if (!ext4_fill_flex_info(sb)) { 4250 ext4_msg(sb, KERN_ERR, 4251 "unable to initialize " 4252 "flex_bg meta info!"); 4253 goto failed_mount6; 4254 } 4255 4256 err = ext4_register_li_request(sb, first_not_zeroed); 4257 if (err) 4258 goto failed_mount6; 4259 4260 err = ext4_register_sysfs(sb); 4261 if (err) 4262 goto failed_mount7; 4263 4264 #ifdef CONFIG_QUOTA 4265 /* Enable quota usage during mount. */ 4266 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) { 4267 err = ext4_enable_quotas(sb); 4268 if (err) 4269 goto failed_mount8; 4270 } 4271 #endif /* CONFIG_QUOTA */ 4272 4273 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 4274 ext4_orphan_cleanup(sb, es); 4275 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 4276 if (needs_recovery) { 4277 ext4_msg(sb, KERN_INFO, "recovery complete"); 4278 ext4_mark_recovery_complete(sb, es); 4279 } 4280 if (EXT4_SB(sb)->s_journal) { 4281 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 4282 descr = " journalled data mode"; 4283 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 4284 descr = " ordered data mode"; 4285 else 4286 descr = " writeback data mode"; 4287 } else 4288 descr = "out journal"; 4289 4290 if (test_opt(sb, DISCARD)) { 4291 struct request_queue *q = bdev_get_queue(sb->s_bdev); 4292 if (!blk_queue_discard(q)) 4293 ext4_msg(sb, KERN_WARNING, 4294 "mounting with \"discard\" option, but " 4295 "the device does not support discard"); 4296 } 4297 4298 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount")) 4299 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 4300 "Opts: %.*s%s%s", descr, 4301 (int) sizeof(sbi->s_es->s_mount_opts), 4302 sbi->s_es->s_mount_opts, 4303 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 4304 4305 if (es->s_error_count) 4306 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 4307 4308 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ 4309 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); 4310 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); 4311 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); 4312 4313 kfree(orig_data); 4314 return 0; 4315 4316 cantfind_ext4: 4317 if (!silent) 4318 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 4319 goto failed_mount; 4320 4321 #ifdef CONFIG_QUOTA 4322 failed_mount8: 4323 ext4_unregister_sysfs(sb); 4324 #endif 4325 failed_mount7: 4326 ext4_unregister_li_request(sb); 4327 failed_mount6: 4328 ext4_mb_release(sb); 4329 if (sbi->s_flex_groups) 4330 kvfree(sbi->s_flex_groups); 4331 percpu_counter_destroy(&sbi->s_freeclusters_counter); 4332 percpu_counter_destroy(&sbi->s_freeinodes_counter); 4333 percpu_counter_destroy(&sbi->s_dirs_counter); 4334 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 4335 failed_mount5: 4336 ext4_ext_release(sb); 4337 ext4_release_system_zone(sb); 4338 failed_mount4a: 4339 dput(sb->s_root); 4340 sb->s_root = NULL; 4341 failed_mount4: 4342 ext4_msg(sb, KERN_ERR, "mount failed"); 4343 if (EXT4_SB(sb)->rsv_conversion_wq) 4344 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); 4345 failed_mount_wq: 4346 if (sbi->s_ea_inode_cache) { 4347 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); 4348 sbi->s_ea_inode_cache = NULL; 4349 } 4350 if (sbi->s_ea_block_cache) { 4351 ext4_xattr_destroy_cache(sbi->s_ea_block_cache); 4352 sbi->s_ea_block_cache = NULL; 4353 } 4354 if (sbi->s_journal) { 4355 jbd2_journal_destroy(sbi->s_journal); 4356 sbi->s_journal = NULL; 4357 } 4358 failed_mount3a: 4359 ext4_es_unregister_shrinker(sbi); 4360 failed_mount3: 4361 del_timer_sync(&sbi->s_err_report); 4362 if (sbi->s_mmp_tsk) 4363 kthread_stop(sbi->s_mmp_tsk); 4364 failed_mount2: 4365 for (i = 0; i < db_count; i++) 4366 brelse(sbi->s_group_desc[i]); 4367 kvfree(sbi->s_group_desc); 4368 failed_mount: 4369 if (sbi->s_chksum_driver) 4370 crypto_free_shash(sbi->s_chksum_driver); 4371 #ifdef CONFIG_QUOTA 4372 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4373 kfree(sbi->s_qf_names[i]); 4374 #endif 4375 ext4_blkdev_remove(sbi); 4376 brelse(bh); 4377 out_fail: 4378 sb->s_fs_info = NULL; 4379 kfree(sbi->s_blockgroup_lock); 4380 out_free_base: 4381 kfree(sbi); 4382 kfree(orig_data); 4383 return err ? err : ret; 4384 } 4385 4386 /* 4387 * Setup any per-fs journal parameters now. We'll do this both on 4388 * initial mount, once the journal has been initialised but before we've 4389 * done any recovery; and again on any subsequent remount. 4390 */ 4391 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 4392 { 4393 struct ext4_sb_info *sbi = EXT4_SB(sb); 4394 4395 journal->j_commit_interval = sbi->s_commit_interval; 4396 journal->j_min_batch_time = sbi->s_min_batch_time; 4397 journal->j_max_batch_time = sbi->s_max_batch_time; 4398 4399 write_lock(&journal->j_state_lock); 4400 if (test_opt(sb, BARRIER)) 4401 journal->j_flags |= JBD2_BARRIER; 4402 else 4403 journal->j_flags &= ~JBD2_BARRIER; 4404 if (test_opt(sb, DATA_ERR_ABORT)) 4405 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 4406 else 4407 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 4408 write_unlock(&journal->j_state_lock); 4409 } 4410 4411 static struct inode *ext4_get_journal_inode(struct super_block *sb, 4412 unsigned int journal_inum) 4413 { 4414 struct inode *journal_inode; 4415 4416 /* 4417 * Test for the existence of a valid inode on disk. Bad things 4418 * happen if we iget() an unused inode, as the subsequent iput() 4419 * will try to delete it. 4420 */ 4421 journal_inode = ext4_iget(sb, journal_inum); 4422 if (IS_ERR(journal_inode)) { 4423 ext4_msg(sb, KERN_ERR, "no journal found"); 4424 return NULL; 4425 } 4426 if (!journal_inode->i_nlink) { 4427 make_bad_inode(journal_inode); 4428 iput(journal_inode); 4429 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 4430 return NULL; 4431 } 4432 4433 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 4434 journal_inode, journal_inode->i_size); 4435 if (!S_ISREG(journal_inode->i_mode)) { 4436 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 4437 iput(journal_inode); 4438 return NULL; 4439 } 4440 return journal_inode; 4441 } 4442 4443 static journal_t *ext4_get_journal(struct super_block *sb, 4444 unsigned int journal_inum) 4445 { 4446 struct inode *journal_inode; 4447 journal_t *journal; 4448 4449 BUG_ON(!ext4_has_feature_journal(sb)); 4450 4451 journal_inode = ext4_get_journal_inode(sb, journal_inum); 4452 if (!journal_inode) 4453 return NULL; 4454 4455 journal = jbd2_journal_init_inode(journal_inode); 4456 if (!journal) { 4457 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 4458 iput(journal_inode); 4459 return NULL; 4460 } 4461 journal->j_private = sb; 4462 ext4_init_journal_params(sb, journal); 4463 return journal; 4464 } 4465 4466 static journal_t *ext4_get_dev_journal(struct super_block *sb, 4467 dev_t j_dev) 4468 { 4469 struct buffer_head *bh; 4470 journal_t *journal; 4471 ext4_fsblk_t start; 4472 ext4_fsblk_t len; 4473 int hblock, blocksize; 4474 ext4_fsblk_t sb_block; 4475 unsigned long offset; 4476 struct ext4_super_block *es; 4477 struct block_device *bdev; 4478 4479 BUG_ON(!ext4_has_feature_journal(sb)); 4480 4481 bdev = ext4_blkdev_get(j_dev, sb); 4482 if (bdev == NULL) 4483 return NULL; 4484 4485 blocksize = sb->s_blocksize; 4486 hblock = bdev_logical_block_size(bdev); 4487 if (blocksize < hblock) { 4488 ext4_msg(sb, KERN_ERR, 4489 "blocksize too small for journal device"); 4490 goto out_bdev; 4491 } 4492 4493 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 4494 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 4495 set_blocksize(bdev, blocksize); 4496 if (!(bh = __bread(bdev, sb_block, blocksize))) { 4497 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 4498 "external journal"); 4499 goto out_bdev; 4500 } 4501 4502 es = (struct ext4_super_block *) (bh->b_data + offset); 4503 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 4504 !(le32_to_cpu(es->s_feature_incompat) & 4505 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 4506 ext4_msg(sb, KERN_ERR, "external journal has " 4507 "bad superblock"); 4508 brelse(bh); 4509 goto out_bdev; 4510 } 4511 4512 if ((le32_to_cpu(es->s_feature_ro_compat) & 4513 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 4514 es->s_checksum != ext4_superblock_csum(sb, es)) { 4515 ext4_msg(sb, KERN_ERR, "external journal has " 4516 "corrupt superblock"); 4517 brelse(bh); 4518 goto out_bdev; 4519 } 4520 4521 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 4522 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 4523 brelse(bh); 4524 goto out_bdev; 4525 } 4526 4527 len = ext4_blocks_count(es); 4528 start = sb_block + 1; 4529 brelse(bh); /* we're done with the superblock */ 4530 4531 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 4532 start, len, blocksize); 4533 if (!journal) { 4534 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 4535 goto out_bdev; 4536 } 4537 journal->j_private = sb; 4538 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer); 4539 wait_on_buffer(journal->j_sb_buffer); 4540 if (!buffer_uptodate(journal->j_sb_buffer)) { 4541 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 4542 goto out_journal; 4543 } 4544 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 4545 ext4_msg(sb, KERN_ERR, "External journal has more than one " 4546 "user (unsupported) - %d", 4547 be32_to_cpu(journal->j_superblock->s_nr_users)); 4548 goto out_journal; 4549 } 4550 EXT4_SB(sb)->journal_bdev = bdev; 4551 ext4_init_journal_params(sb, journal); 4552 return journal; 4553 4554 out_journal: 4555 jbd2_journal_destroy(journal); 4556 out_bdev: 4557 ext4_blkdev_put(bdev); 4558 return NULL; 4559 } 4560 4561 static int ext4_load_journal(struct super_block *sb, 4562 struct ext4_super_block *es, 4563 unsigned long journal_devnum) 4564 { 4565 journal_t *journal; 4566 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 4567 dev_t journal_dev; 4568 int err = 0; 4569 int really_read_only; 4570 4571 BUG_ON(!ext4_has_feature_journal(sb)); 4572 4573 if (journal_devnum && 4574 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4575 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 4576 "numbers have changed"); 4577 journal_dev = new_decode_dev(journal_devnum); 4578 } else 4579 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 4580 4581 really_read_only = bdev_read_only(sb->s_bdev); 4582 4583 /* 4584 * Are we loading a blank journal or performing recovery after a 4585 * crash? For recovery, we need to check in advance whether we 4586 * can get read-write access to the device. 4587 */ 4588 if (ext4_has_feature_journal_needs_recovery(sb)) { 4589 if (sb->s_flags & MS_RDONLY) { 4590 ext4_msg(sb, KERN_INFO, "INFO: recovery " 4591 "required on readonly filesystem"); 4592 if (really_read_only) { 4593 ext4_msg(sb, KERN_ERR, "write access " 4594 "unavailable, cannot proceed"); 4595 return -EROFS; 4596 } 4597 ext4_msg(sb, KERN_INFO, "write access will " 4598 "be enabled during recovery"); 4599 } 4600 } 4601 4602 if (journal_inum && journal_dev) { 4603 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4604 "and inode journals!"); 4605 return -EINVAL; 4606 } 4607 4608 if (journal_inum) { 4609 if (!(journal = ext4_get_journal(sb, journal_inum))) 4610 return -EINVAL; 4611 } else { 4612 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4613 return -EINVAL; 4614 } 4615 4616 if (!(journal->j_flags & JBD2_BARRIER)) 4617 ext4_msg(sb, KERN_INFO, "barriers disabled"); 4618 4619 if (!ext4_has_feature_journal_needs_recovery(sb)) 4620 err = jbd2_journal_wipe(journal, !really_read_only); 4621 if (!err) { 4622 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 4623 if (save) 4624 memcpy(save, ((char *) es) + 4625 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4626 err = jbd2_journal_load(journal); 4627 if (save) 4628 memcpy(((char *) es) + EXT4_S_ERR_START, 4629 save, EXT4_S_ERR_LEN); 4630 kfree(save); 4631 } 4632 4633 if (err) { 4634 ext4_msg(sb, KERN_ERR, "error loading journal"); 4635 jbd2_journal_destroy(journal); 4636 return err; 4637 } 4638 4639 EXT4_SB(sb)->s_journal = journal; 4640 ext4_clear_journal_err(sb, es); 4641 4642 if (!really_read_only && journal_devnum && 4643 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4644 es->s_journal_dev = cpu_to_le32(journal_devnum); 4645 4646 /* Make sure we flush the recovery flag to disk. */ 4647 ext4_commit_super(sb, 1); 4648 } 4649 4650 return 0; 4651 } 4652 4653 static int ext4_commit_super(struct super_block *sb, int sync) 4654 { 4655 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4656 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4657 int error = 0; 4658 4659 if (!sbh || block_device_ejected(sb)) 4660 return error; 4661 /* 4662 * If the file system is mounted read-only, don't update the 4663 * superblock write time. This avoids updating the superblock 4664 * write time when we are mounting the root file system 4665 * read/only but we need to replay the journal; at that point, 4666 * for people who are east of GMT and who make their clock 4667 * tick in localtime for Windows bug-for-bug compatibility, 4668 * the clock is set in the future, and this will cause e2fsck 4669 * to complain and force a full file system check. 4670 */ 4671 if (!(sb->s_flags & MS_RDONLY)) 4672 es->s_wtime = cpu_to_le32(get_seconds()); 4673 if (sb->s_bdev->bd_part) 4674 es->s_kbytes_written = 4675 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4676 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4677 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4678 else 4679 es->s_kbytes_written = 4680 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 4681 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter)) 4682 ext4_free_blocks_count_set(es, 4683 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( 4684 &EXT4_SB(sb)->s_freeclusters_counter))); 4685 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter)) 4686 es->s_free_inodes_count = 4687 cpu_to_le32(percpu_counter_sum_positive( 4688 &EXT4_SB(sb)->s_freeinodes_counter)); 4689 BUFFER_TRACE(sbh, "marking dirty"); 4690 ext4_superblock_csum_set(sb); 4691 if (sync) 4692 lock_buffer(sbh); 4693 if (buffer_write_io_error(sbh)) { 4694 /* 4695 * Oh, dear. A previous attempt to write the 4696 * superblock failed. This could happen because the 4697 * USB device was yanked out. Or it could happen to 4698 * be a transient write error and maybe the block will 4699 * be remapped. Nothing we can do but to retry the 4700 * write and hope for the best. 4701 */ 4702 ext4_msg(sb, KERN_ERR, "previous I/O error to " 4703 "superblock detected"); 4704 clear_buffer_write_io_error(sbh); 4705 set_buffer_uptodate(sbh); 4706 } 4707 mark_buffer_dirty(sbh); 4708 if (sync) { 4709 unlock_buffer(sbh); 4710 error = __sync_dirty_buffer(sbh, 4711 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0)); 4712 if (error) 4713 return error; 4714 4715 error = buffer_write_io_error(sbh); 4716 if (error) { 4717 ext4_msg(sb, KERN_ERR, "I/O error while writing " 4718 "superblock"); 4719 clear_buffer_write_io_error(sbh); 4720 set_buffer_uptodate(sbh); 4721 } 4722 } 4723 return error; 4724 } 4725 4726 /* 4727 * Have we just finished recovery? If so, and if we are mounting (or 4728 * remounting) the filesystem readonly, then we will end up with a 4729 * consistent fs on disk. Record that fact. 4730 */ 4731 static void ext4_mark_recovery_complete(struct super_block *sb, 4732 struct ext4_super_block *es) 4733 { 4734 journal_t *journal = EXT4_SB(sb)->s_journal; 4735 4736 if (!ext4_has_feature_journal(sb)) { 4737 BUG_ON(journal != NULL); 4738 return; 4739 } 4740 jbd2_journal_lock_updates(journal); 4741 if (jbd2_journal_flush(journal) < 0) 4742 goto out; 4743 4744 if (ext4_has_feature_journal_needs_recovery(sb) && 4745 sb->s_flags & MS_RDONLY) { 4746 ext4_clear_feature_journal_needs_recovery(sb); 4747 ext4_commit_super(sb, 1); 4748 } 4749 4750 out: 4751 jbd2_journal_unlock_updates(journal); 4752 } 4753 4754 /* 4755 * If we are mounting (or read-write remounting) a filesystem whose journal 4756 * has recorded an error from a previous lifetime, move that error to the 4757 * main filesystem now. 4758 */ 4759 static void ext4_clear_journal_err(struct super_block *sb, 4760 struct ext4_super_block *es) 4761 { 4762 journal_t *journal; 4763 int j_errno; 4764 const char *errstr; 4765 4766 BUG_ON(!ext4_has_feature_journal(sb)); 4767 4768 journal = EXT4_SB(sb)->s_journal; 4769 4770 /* 4771 * Now check for any error status which may have been recorded in the 4772 * journal by a prior ext4_error() or ext4_abort() 4773 */ 4774 4775 j_errno = jbd2_journal_errno(journal); 4776 if (j_errno) { 4777 char nbuf[16]; 4778 4779 errstr = ext4_decode_error(sb, j_errno, nbuf); 4780 ext4_warning(sb, "Filesystem error recorded " 4781 "from previous mount: %s", errstr); 4782 ext4_warning(sb, "Marking fs in need of filesystem check."); 4783 4784 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4785 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4786 ext4_commit_super(sb, 1); 4787 4788 jbd2_journal_clear_err(journal); 4789 jbd2_journal_update_sb_errno(journal); 4790 } 4791 } 4792 4793 /* 4794 * Force the running and committing transactions to commit, 4795 * and wait on the commit. 4796 */ 4797 int ext4_force_commit(struct super_block *sb) 4798 { 4799 journal_t *journal; 4800 4801 if (sb->s_flags & MS_RDONLY) 4802 return 0; 4803 4804 journal = EXT4_SB(sb)->s_journal; 4805 return ext4_journal_force_commit(journal); 4806 } 4807 4808 static int ext4_sync_fs(struct super_block *sb, int wait) 4809 { 4810 int ret = 0; 4811 tid_t target; 4812 bool needs_barrier = false; 4813 struct ext4_sb_info *sbi = EXT4_SB(sb); 4814 4815 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) 4816 return 0; 4817 4818 trace_ext4_sync_fs(sb, wait); 4819 flush_workqueue(sbi->rsv_conversion_wq); 4820 /* 4821 * Writeback quota in non-journalled quota case - journalled quota has 4822 * no dirty dquots 4823 */ 4824 dquot_writeback_dquots(sb, -1); 4825 /* 4826 * Data writeback is possible w/o journal transaction, so barrier must 4827 * being sent at the end of the function. But we can skip it if 4828 * transaction_commit will do it for us. 4829 */ 4830 if (sbi->s_journal) { 4831 target = jbd2_get_latest_transaction(sbi->s_journal); 4832 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && 4833 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) 4834 needs_barrier = true; 4835 4836 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4837 if (wait) 4838 ret = jbd2_log_wait_commit(sbi->s_journal, 4839 target); 4840 } 4841 } else if (wait && test_opt(sb, BARRIER)) 4842 needs_barrier = true; 4843 if (needs_barrier) { 4844 int err; 4845 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 4846 if (!ret) 4847 ret = err; 4848 } 4849 4850 return ret; 4851 } 4852 4853 /* 4854 * LVM calls this function before a (read-only) snapshot is created. This 4855 * gives us a chance to flush the journal completely and mark the fs clean. 4856 * 4857 * Note that only this function cannot bring a filesystem to be in a clean 4858 * state independently. It relies on upper layer to stop all data & metadata 4859 * modifications. 4860 */ 4861 static int ext4_freeze(struct super_block *sb) 4862 { 4863 int error = 0; 4864 journal_t *journal; 4865 4866 if (sb->s_flags & MS_RDONLY) 4867 return 0; 4868 4869 journal = EXT4_SB(sb)->s_journal; 4870 4871 if (journal) { 4872 /* Now we set up the journal barrier. */ 4873 jbd2_journal_lock_updates(journal); 4874 4875 /* 4876 * Don't clear the needs_recovery flag if we failed to 4877 * flush the journal. 4878 */ 4879 error = jbd2_journal_flush(journal); 4880 if (error < 0) 4881 goto out; 4882 4883 /* Journal blocked and flushed, clear needs_recovery flag. */ 4884 ext4_clear_feature_journal_needs_recovery(sb); 4885 } 4886 4887 error = ext4_commit_super(sb, 1); 4888 out: 4889 if (journal) 4890 /* we rely on upper layer to stop further updates */ 4891 jbd2_journal_unlock_updates(journal); 4892 return error; 4893 } 4894 4895 /* 4896 * Called by LVM after the snapshot is done. We need to reset the RECOVER 4897 * flag here, even though the filesystem is not technically dirty yet. 4898 */ 4899 static int ext4_unfreeze(struct super_block *sb) 4900 { 4901 if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb))) 4902 return 0; 4903 4904 if (EXT4_SB(sb)->s_journal) { 4905 /* Reset the needs_recovery flag before the fs is unlocked. */ 4906 ext4_set_feature_journal_needs_recovery(sb); 4907 } 4908 4909 ext4_commit_super(sb, 1); 4910 return 0; 4911 } 4912 4913 /* 4914 * Structure to save mount options for ext4_remount's benefit 4915 */ 4916 struct ext4_mount_options { 4917 unsigned long s_mount_opt; 4918 unsigned long s_mount_opt2; 4919 kuid_t s_resuid; 4920 kgid_t s_resgid; 4921 unsigned long s_commit_interval; 4922 u32 s_min_batch_time, s_max_batch_time; 4923 #ifdef CONFIG_QUOTA 4924 int s_jquota_fmt; 4925 char *s_qf_names[EXT4_MAXQUOTAS]; 4926 #endif 4927 }; 4928 4929 static int ext4_remount(struct super_block *sb, int *flags, char *data) 4930 { 4931 struct ext4_super_block *es; 4932 struct ext4_sb_info *sbi = EXT4_SB(sb); 4933 unsigned long old_sb_flags; 4934 struct ext4_mount_options old_opts; 4935 int enable_quota = 0; 4936 ext4_group_t g; 4937 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4938 int err = 0; 4939 #ifdef CONFIG_QUOTA 4940 int i, j; 4941 #endif 4942 char *orig_data = kstrdup(data, GFP_KERNEL); 4943 4944 /* Store the original options */ 4945 old_sb_flags = sb->s_flags; 4946 old_opts.s_mount_opt = sbi->s_mount_opt; 4947 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4948 old_opts.s_resuid = sbi->s_resuid; 4949 old_opts.s_resgid = sbi->s_resgid; 4950 old_opts.s_commit_interval = sbi->s_commit_interval; 4951 old_opts.s_min_batch_time = sbi->s_min_batch_time; 4952 old_opts.s_max_batch_time = sbi->s_max_batch_time; 4953 #ifdef CONFIG_QUOTA 4954 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4955 for (i = 0; i < EXT4_MAXQUOTAS; i++) 4956 if (sbi->s_qf_names[i]) { 4957 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], 4958 GFP_KERNEL); 4959 if (!old_opts.s_qf_names[i]) { 4960 for (j = 0; j < i; j++) 4961 kfree(old_opts.s_qf_names[j]); 4962 kfree(orig_data); 4963 return -ENOMEM; 4964 } 4965 } else 4966 old_opts.s_qf_names[i] = NULL; 4967 #endif 4968 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4969 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4970 4971 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { 4972 err = -EINVAL; 4973 goto restore_opts; 4974 } 4975 4976 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ 4977 test_opt(sb, JOURNAL_CHECKSUM)) { 4978 ext4_msg(sb, KERN_ERR, "changing journal_checksum " 4979 "during remount not supported; ignoring"); 4980 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; 4981 } 4982 4983 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 4984 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 4985 ext4_msg(sb, KERN_ERR, "can't mount with " 4986 "both data=journal and delalloc"); 4987 err = -EINVAL; 4988 goto restore_opts; 4989 } 4990 if (test_opt(sb, DIOREAD_NOLOCK)) { 4991 ext4_msg(sb, KERN_ERR, "can't mount with " 4992 "both data=journal and dioread_nolock"); 4993 err = -EINVAL; 4994 goto restore_opts; 4995 } 4996 if (test_opt(sb, DAX)) { 4997 ext4_msg(sb, KERN_ERR, "can't mount with " 4998 "both data=journal and dax"); 4999 err = -EINVAL; 5000 goto restore_opts; 5001 } 5002 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) { 5003 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 5004 ext4_msg(sb, KERN_ERR, "can't mount with " 5005 "journal_async_commit in data=ordered mode"); 5006 err = -EINVAL; 5007 goto restore_opts; 5008 } 5009 } 5010 5011 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) { 5012 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount"); 5013 err = -EINVAL; 5014 goto restore_opts; 5015 } 5016 5017 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) { 5018 ext4_msg(sb, KERN_WARNING, "warning: refusing change of " 5019 "dax flag with busy inodes while remounting"); 5020 sbi->s_mount_opt ^= EXT4_MOUNT_DAX; 5021 } 5022 5023 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 5024 ext4_abort(sb, "Abort forced by user"); 5025 5026 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 5027 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 5028 5029 es = sbi->s_es; 5030 5031 if (sbi->s_journal) { 5032 ext4_init_journal_params(sb, sbi->s_journal); 5033 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 5034 } 5035 5036 if (*flags & MS_LAZYTIME) 5037 sb->s_flags |= MS_LAZYTIME; 5038 5039 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { 5040 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 5041 err = -EROFS; 5042 goto restore_opts; 5043 } 5044 5045 if (*flags & MS_RDONLY) { 5046 err = sync_filesystem(sb); 5047 if (err < 0) 5048 goto restore_opts; 5049 err = dquot_suspend(sb, -1); 5050 if (err < 0) 5051 goto restore_opts; 5052 5053 /* 5054 * First of all, the unconditional stuff we have to do 5055 * to disable replay of the journal when we next remount 5056 */ 5057 sb->s_flags |= MS_RDONLY; 5058 5059 /* 5060 * OK, test if we are remounting a valid rw partition 5061 * readonly, and if so set the rdonly flag and then 5062 * mark the partition as valid again. 5063 */ 5064 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 5065 (sbi->s_mount_state & EXT4_VALID_FS)) 5066 es->s_state = cpu_to_le16(sbi->s_mount_state); 5067 5068 if (sbi->s_journal) 5069 ext4_mark_recovery_complete(sb, es); 5070 } else { 5071 /* Make sure we can mount this feature set readwrite */ 5072 if (ext4_has_feature_readonly(sb) || 5073 !ext4_feature_set_ok(sb, 0)) { 5074 err = -EROFS; 5075 goto restore_opts; 5076 } 5077 /* 5078 * Make sure the group descriptor checksums 5079 * are sane. If they aren't, refuse to remount r/w. 5080 */ 5081 for (g = 0; g < sbi->s_groups_count; g++) { 5082 struct ext4_group_desc *gdp = 5083 ext4_get_group_desc(sb, g, NULL); 5084 5085 if (!ext4_group_desc_csum_verify(sb, g, gdp)) { 5086 ext4_msg(sb, KERN_ERR, 5087 "ext4_remount: Checksum for group %u failed (%u!=%u)", 5088 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)), 5089 le16_to_cpu(gdp->bg_checksum)); 5090 err = -EFSBADCRC; 5091 goto restore_opts; 5092 } 5093 } 5094 5095 /* 5096 * If we have an unprocessed orphan list hanging 5097 * around from a previously readonly bdev mount, 5098 * require a full umount/remount for now. 5099 */ 5100 if (es->s_last_orphan) { 5101 ext4_msg(sb, KERN_WARNING, "Couldn't " 5102 "remount RDWR because of unprocessed " 5103 "orphan inode list. Please " 5104 "umount/remount instead"); 5105 err = -EINVAL; 5106 goto restore_opts; 5107 } 5108 5109 /* 5110 * Mounting a RDONLY partition read-write, so reread 5111 * and store the current valid flag. (It may have 5112 * been changed by e2fsck since we originally mounted 5113 * the partition.) 5114 */ 5115 if (sbi->s_journal) 5116 ext4_clear_journal_err(sb, es); 5117 sbi->s_mount_state = le16_to_cpu(es->s_state); 5118 if (!ext4_setup_super(sb, es, 0)) 5119 sb->s_flags &= ~MS_RDONLY; 5120 if (ext4_has_feature_mmp(sb)) 5121 if (ext4_multi_mount_protect(sb, 5122 le64_to_cpu(es->s_mmp_block))) { 5123 err = -EROFS; 5124 goto restore_opts; 5125 } 5126 enable_quota = 1; 5127 } 5128 } 5129 5130 /* 5131 * Reinitialize lazy itable initialization thread based on 5132 * current settings 5133 */ 5134 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 5135 ext4_unregister_li_request(sb); 5136 else { 5137 ext4_group_t first_not_zeroed; 5138 first_not_zeroed = ext4_has_uninit_itable(sb); 5139 ext4_register_li_request(sb, first_not_zeroed); 5140 } 5141 5142 ext4_setup_system_zone(sb); 5143 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) 5144 ext4_commit_super(sb, 1); 5145 5146 #ifdef CONFIG_QUOTA 5147 /* Release old quota file names */ 5148 for (i = 0; i < EXT4_MAXQUOTAS; i++) 5149 kfree(old_opts.s_qf_names[i]); 5150 if (enable_quota) { 5151 if (sb_any_quota_suspended(sb)) 5152 dquot_resume(sb, -1); 5153 else if (ext4_has_feature_quota(sb)) { 5154 err = ext4_enable_quotas(sb); 5155 if (err) 5156 goto restore_opts; 5157 } 5158 } 5159 #endif 5160 5161 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME); 5162 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 5163 kfree(orig_data); 5164 return 0; 5165 5166 restore_opts: 5167 sb->s_flags = old_sb_flags; 5168 sbi->s_mount_opt = old_opts.s_mount_opt; 5169 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 5170 sbi->s_resuid = old_opts.s_resuid; 5171 sbi->s_resgid = old_opts.s_resgid; 5172 sbi->s_commit_interval = old_opts.s_commit_interval; 5173 sbi->s_min_batch_time = old_opts.s_min_batch_time; 5174 sbi->s_max_batch_time = old_opts.s_max_batch_time; 5175 #ifdef CONFIG_QUOTA 5176 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 5177 for (i = 0; i < EXT4_MAXQUOTAS; i++) { 5178 kfree(sbi->s_qf_names[i]); 5179 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 5180 } 5181 #endif 5182 kfree(orig_data); 5183 return err; 5184 } 5185 5186 #ifdef CONFIG_QUOTA 5187 static int ext4_statfs_project(struct super_block *sb, 5188 kprojid_t projid, struct kstatfs *buf) 5189 { 5190 struct kqid qid; 5191 struct dquot *dquot; 5192 u64 limit; 5193 u64 curblock; 5194 5195 qid = make_kqid_projid(projid); 5196 dquot = dqget(sb, qid); 5197 if (IS_ERR(dquot)) 5198 return PTR_ERR(dquot); 5199 spin_lock(&dq_data_lock); 5200 5201 limit = (dquot->dq_dqb.dqb_bsoftlimit ? 5202 dquot->dq_dqb.dqb_bsoftlimit : 5203 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits; 5204 if (limit && buf->f_blocks > limit) { 5205 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits; 5206 buf->f_blocks = limit; 5207 buf->f_bfree = buf->f_bavail = 5208 (buf->f_blocks > curblock) ? 5209 (buf->f_blocks - curblock) : 0; 5210 } 5211 5212 limit = dquot->dq_dqb.dqb_isoftlimit ? 5213 dquot->dq_dqb.dqb_isoftlimit : 5214 dquot->dq_dqb.dqb_ihardlimit; 5215 if (limit && buf->f_files > limit) { 5216 buf->f_files = limit; 5217 buf->f_ffree = 5218 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ? 5219 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0; 5220 } 5221 5222 spin_unlock(&dq_data_lock); 5223 dqput(dquot); 5224 return 0; 5225 } 5226 #endif 5227 5228 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 5229 { 5230 struct super_block *sb = dentry->d_sb; 5231 struct ext4_sb_info *sbi = EXT4_SB(sb); 5232 struct ext4_super_block *es = sbi->s_es; 5233 ext4_fsblk_t overhead = 0, resv_blocks; 5234 u64 fsid; 5235 s64 bfree; 5236 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); 5237 5238 if (!test_opt(sb, MINIX_DF)) 5239 overhead = sbi->s_overhead; 5240 5241 buf->f_type = EXT4_SUPER_MAGIC; 5242 buf->f_bsize = sb->s_blocksize; 5243 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); 5244 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 5245 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 5246 /* prevent underflow in case that few free space is available */ 5247 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 5248 buf->f_bavail = buf->f_bfree - 5249 (ext4_r_blocks_count(es) + resv_blocks); 5250 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) 5251 buf->f_bavail = 0; 5252 buf->f_files = le32_to_cpu(es->s_inodes_count); 5253 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 5254 buf->f_namelen = EXT4_NAME_LEN; 5255 fsid = le64_to_cpup((void *)es->s_uuid) ^ 5256 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 5257 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 5258 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 5259 5260 #ifdef CONFIG_QUOTA 5261 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) && 5262 sb_has_quota_limits_enabled(sb, PRJQUOTA)) 5263 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf); 5264 #endif 5265 return 0; 5266 } 5267 5268 /* Helper function for writing quotas on sync - we need to start transaction 5269 * before quota file is locked for write. Otherwise the are possible deadlocks: 5270 * Process 1 Process 2 5271 * ext4_create() quota_sync() 5272 * jbd2_journal_start() write_dquot() 5273 * dquot_initialize() down(dqio_mutex) 5274 * down(dqio_mutex) jbd2_journal_start() 5275 * 5276 */ 5277 5278 #ifdef CONFIG_QUOTA 5279 5280 static inline struct inode *dquot_to_inode(struct dquot *dquot) 5281 { 5282 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 5283 } 5284 5285 static int ext4_write_dquot(struct dquot *dquot) 5286 { 5287 int ret, err; 5288 handle_t *handle; 5289 struct inode *inode; 5290 5291 inode = dquot_to_inode(dquot); 5292 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 5293 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 5294 if (IS_ERR(handle)) 5295 return PTR_ERR(handle); 5296 ret = dquot_commit(dquot); 5297 err = ext4_journal_stop(handle); 5298 if (!ret) 5299 ret = err; 5300 return ret; 5301 } 5302 5303 static int ext4_acquire_dquot(struct dquot *dquot) 5304 { 5305 int ret, err; 5306 handle_t *handle; 5307 5308 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 5309 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 5310 if (IS_ERR(handle)) 5311 return PTR_ERR(handle); 5312 ret = dquot_acquire(dquot); 5313 err = ext4_journal_stop(handle); 5314 if (!ret) 5315 ret = err; 5316 return ret; 5317 } 5318 5319 static int ext4_release_dquot(struct dquot *dquot) 5320 { 5321 int ret, err; 5322 handle_t *handle; 5323 5324 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, 5325 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 5326 if (IS_ERR(handle)) { 5327 /* Release dquot anyway to avoid endless cycle in dqput() */ 5328 dquot_release(dquot); 5329 return PTR_ERR(handle); 5330 } 5331 ret = dquot_release(dquot); 5332 err = ext4_journal_stop(handle); 5333 if (!ret) 5334 ret = err; 5335 return ret; 5336 } 5337 5338 static int ext4_mark_dquot_dirty(struct dquot *dquot) 5339 { 5340 struct super_block *sb = dquot->dq_sb; 5341 struct ext4_sb_info *sbi = EXT4_SB(sb); 5342 5343 /* Are we journaling quotas? */ 5344 if (ext4_has_feature_quota(sb) || 5345 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 5346 dquot_mark_dquot_dirty(dquot); 5347 return ext4_write_dquot(dquot); 5348 } else { 5349 return dquot_mark_dquot_dirty(dquot); 5350 } 5351 } 5352 5353 static int ext4_write_info(struct super_block *sb, int type) 5354 { 5355 int ret, err; 5356 handle_t *handle; 5357 5358 /* Data block + inode block */ 5359 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2); 5360 if (IS_ERR(handle)) 5361 return PTR_ERR(handle); 5362 ret = dquot_commit_info(sb, type); 5363 err = ext4_journal_stop(handle); 5364 if (!ret) 5365 ret = err; 5366 return ret; 5367 } 5368 5369 /* 5370 * Turn on quotas during mount time - we need to find 5371 * the quota file and such... 5372 */ 5373 static int ext4_quota_on_mount(struct super_block *sb, int type) 5374 { 5375 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 5376 EXT4_SB(sb)->s_jquota_fmt, type); 5377 } 5378 5379 static void lockdep_set_quota_inode(struct inode *inode, int subclass) 5380 { 5381 struct ext4_inode_info *ei = EXT4_I(inode); 5382 5383 /* The first argument of lockdep_set_subclass has to be 5384 * *exactly* the same as the argument to init_rwsem() --- in 5385 * this case, in init_once() --- or lockdep gets unhappy 5386 * because the name of the lock is set using the 5387 * stringification of the argument to init_rwsem(). 5388 */ 5389 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ 5390 lockdep_set_subclass(&ei->i_data_sem, subclass); 5391 } 5392 5393 /* 5394 * Standard function to be called on quota_on 5395 */ 5396 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 5397 const struct path *path) 5398 { 5399 int err; 5400 5401 if (!test_opt(sb, QUOTA)) 5402 return -EINVAL; 5403 5404 /* Quotafile not on the same filesystem? */ 5405 if (path->dentry->d_sb != sb) 5406 return -EXDEV; 5407 /* Journaling quota? */ 5408 if (EXT4_SB(sb)->s_qf_names[type]) { 5409 /* Quotafile not in fs root? */ 5410 if (path->dentry->d_parent != sb->s_root) 5411 ext4_msg(sb, KERN_WARNING, 5412 "Quota file not on filesystem root. " 5413 "Journaled quota will not work"); 5414 } 5415 5416 /* 5417 * When we journal data on quota file, we have to flush journal to see 5418 * all updates to the file when we bypass pagecache... 5419 */ 5420 if (EXT4_SB(sb)->s_journal && 5421 ext4_should_journal_data(d_inode(path->dentry))) { 5422 /* 5423 * We don't need to lock updates but journal_flush() could 5424 * otherwise be livelocked... 5425 */ 5426 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 5427 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 5428 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 5429 if (err) 5430 return err; 5431 } 5432 5433 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA); 5434 err = dquot_quota_on(sb, type, format_id, path); 5435 if (err) { 5436 lockdep_set_quota_inode(path->dentry->d_inode, 5437 I_DATA_SEM_NORMAL); 5438 } else { 5439 struct inode *inode = d_inode(path->dentry); 5440 handle_t *handle; 5441 5442 /* 5443 * Set inode flags to prevent userspace from messing with quota 5444 * files. If this fails, we return success anyway since quotas 5445 * are already enabled and this is not a hard failure. 5446 */ 5447 inode_lock(inode); 5448 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 5449 if (IS_ERR(handle)) 5450 goto unlock_inode; 5451 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL; 5452 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 5453 S_NOATIME | S_IMMUTABLE); 5454 ext4_mark_inode_dirty(handle, inode); 5455 ext4_journal_stop(handle); 5456 unlock_inode: 5457 inode_unlock(inode); 5458 } 5459 return err; 5460 } 5461 5462 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 5463 unsigned int flags) 5464 { 5465 int err; 5466 struct inode *qf_inode; 5467 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 5468 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 5469 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 5470 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 5471 }; 5472 5473 BUG_ON(!ext4_has_feature_quota(sb)); 5474 5475 if (!qf_inums[type]) 5476 return -EPERM; 5477 5478 qf_inode = ext4_iget(sb, qf_inums[type]); 5479 if (IS_ERR(qf_inode)) { 5480 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); 5481 return PTR_ERR(qf_inode); 5482 } 5483 5484 /* Don't account quota for quota files to avoid recursion */ 5485 qf_inode->i_flags |= S_NOQUOTA; 5486 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); 5487 err = dquot_enable(qf_inode, type, format_id, flags); 5488 iput(qf_inode); 5489 if (err) 5490 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); 5491 5492 return err; 5493 } 5494 5495 /* Enable usage tracking for all quota types. */ 5496 static int ext4_enable_quotas(struct super_block *sb) 5497 { 5498 int type, err = 0; 5499 unsigned long qf_inums[EXT4_MAXQUOTAS] = { 5500 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 5501 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), 5502 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) 5503 }; 5504 bool quota_mopt[EXT4_MAXQUOTAS] = { 5505 test_opt(sb, USRQUOTA), 5506 test_opt(sb, GRPQUOTA), 5507 test_opt(sb, PRJQUOTA), 5508 }; 5509 5510 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 5511 for (type = 0; type < EXT4_MAXQUOTAS; type++) { 5512 if (qf_inums[type]) { 5513 err = ext4_quota_enable(sb, type, QFMT_VFS_V1, 5514 DQUOT_USAGE_ENABLED | 5515 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0)); 5516 if (err) { 5517 ext4_warning(sb, 5518 "Failed to enable quota tracking " 5519 "(type=%d, err=%d). Please run " 5520 "e2fsck to fix.", type, err); 5521 return err; 5522 } 5523 } 5524 } 5525 return 0; 5526 } 5527 5528 static int ext4_quota_off(struct super_block *sb, int type) 5529 { 5530 struct inode *inode = sb_dqopt(sb)->files[type]; 5531 handle_t *handle; 5532 int err; 5533 5534 /* Force all delayed allocation blocks to be allocated. 5535 * Caller already holds s_umount sem */ 5536 if (test_opt(sb, DELALLOC)) 5537 sync_filesystem(sb); 5538 5539 if (!inode || !igrab(inode)) 5540 goto out; 5541 5542 err = dquot_quota_off(sb, type); 5543 if (err || ext4_has_feature_quota(sb)) 5544 goto out_put; 5545 5546 inode_lock(inode); 5547 /* 5548 * Update modification times of quota files when userspace can 5549 * start looking at them. If we fail, we return success anyway since 5550 * this is not a hard failure and quotas are already disabled. 5551 */ 5552 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); 5553 if (IS_ERR(handle)) 5554 goto out_unlock; 5555 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL); 5556 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 5557 inode->i_mtime = inode->i_ctime = current_time(inode); 5558 ext4_mark_inode_dirty(handle, inode); 5559 ext4_journal_stop(handle); 5560 out_unlock: 5561 inode_unlock(inode); 5562 out_put: 5563 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL); 5564 iput(inode); 5565 return err; 5566 out: 5567 return dquot_quota_off(sb, type); 5568 } 5569 5570 /* Read data from quotafile - avoid pagecache and such because we cannot afford 5571 * acquiring the locks... As quota files are never truncated and quota code 5572 * itself serializes the operations (and no one else should touch the files) 5573 * we don't have to be afraid of races */ 5574 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 5575 size_t len, loff_t off) 5576 { 5577 struct inode *inode = sb_dqopt(sb)->files[type]; 5578 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5579 int offset = off & (sb->s_blocksize - 1); 5580 int tocopy; 5581 size_t toread; 5582 struct buffer_head *bh; 5583 loff_t i_size = i_size_read(inode); 5584 5585 if (off > i_size) 5586 return 0; 5587 if (off+len > i_size) 5588 len = i_size-off; 5589 toread = len; 5590 while (toread > 0) { 5591 tocopy = sb->s_blocksize - offset < toread ? 5592 sb->s_blocksize - offset : toread; 5593 bh = ext4_bread(NULL, inode, blk, 0); 5594 if (IS_ERR(bh)) 5595 return PTR_ERR(bh); 5596 if (!bh) /* A hole? */ 5597 memset(data, 0, tocopy); 5598 else 5599 memcpy(data, bh->b_data+offset, tocopy); 5600 brelse(bh); 5601 offset = 0; 5602 toread -= tocopy; 5603 data += tocopy; 5604 blk++; 5605 } 5606 return len; 5607 } 5608 5609 /* Write to quotafile (we know the transaction is already started and has 5610 * enough credits) */ 5611 static ssize_t ext4_quota_write(struct super_block *sb, int type, 5612 const char *data, size_t len, loff_t off) 5613 { 5614 struct inode *inode = sb_dqopt(sb)->files[type]; 5615 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5616 int err, offset = off & (sb->s_blocksize - 1); 5617 int retries = 0; 5618 struct buffer_head *bh; 5619 handle_t *handle = journal_current_handle(); 5620 5621 if (EXT4_SB(sb)->s_journal && !handle) { 5622 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5623 " cancelled because transaction is not started", 5624 (unsigned long long)off, (unsigned long long)len); 5625 return -EIO; 5626 } 5627 /* 5628 * Since we account only one data block in transaction credits, 5629 * then it is impossible to cross a block boundary. 5630 */ 5631 if (sb->s_blocksize - offset < len) { 5632 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5633 " cancelled because not block aligned", 5634 (unsigned long long)off, (unsigned long long)len); 5635 return -EIO; 5636 } 5637 5638 do { 5639 bh = ext4_bread(handle, inode, blk, 5640 EXT4_GET_BLOCKS_CREATE | 5641 EXT4_GET_BLOCKS_METADATA_NOFAIL); 5642 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) && 5643 ext4_should_retry_alloc(inode->i_sb, &retries)); 5644 if (IS_ERR(bh)) 5645 return PTR_ERR(bh); 5646 if (!bh) 5647 goto out; 5648 BUFFER_TRACE(bh, "get write access"); 5649 err = ext4_journal_get_write_access(handle, bh); 5650 if (err) { 5651 brelse(bh); 5652 return err; 5653 } 5654 lock_buffer(bh); 5655 memcpy(bh->b_data+offset, data, len); 5656 flush_dcache_page(bh->b_page); 5657 unlock_buffer(bh); 5658 err = ext4_handle_dirty_metadata(handle, NULL, bh); 5659 brelse(bh); 5660 out: 5661 if (inode->i_size < off + len) { 5662 i_size_write(inode, off + len); 5663 EXT4_I(inode)->i_disksize = inode->i_size; 5664 ext4_mark_inode_dirty(handle, inode); 5665 } 5666 return len; 5667 } 5668 5669 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid) 5670 { 5671 const struct quota_format_ops *ops; 5672 5673 if (!sb_has_quota_loaded(sb, qid->type)) 5674 return -ESRCH; 5675 ops = sb_dqopt(sb)->ops[qid->type]; 5676 if (!ops || !ops->get_next_id) 5677 return -ENOSYS; 5678 return dquot_get_next_id(sb, qid); 5679 } 5680 #endif 5681 5682 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 5683 const char *dev_name, void *data) 5684 { 5685 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 5686 } 5687 5688 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) 5689 static inline void register_as_ext2(void) 5690 { 5691 int err = register_filesystem(&ext2_fs_type); 5692 if (err) 5693 printk(KERN_WARNING 5694 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 5695 } 5696 5697 static inline void unregister_as_ext2(void) 5698 { 5699 unregister_filesystem(&ext2_fs_type); 5700 } 5701 5702 static inline int ext2_feature_set_ok(struct super_block *sb) 5703 { 5704 if (ext4_has_unknown_ext2_incompat_features(sb)) 5705 return 0; 5706 if (sb->s_flags & MS_RDONLY) 5707 return 1; 5708 if (ext4_has_unknown_ext2_ro_compat_features(sb)) 5709 return 0; 5710 return 1; 5711 } 5712 #else 5713 static inline void register_as_ext2(void) { } 5714 static inline void unregister_as_ext2(void) { } 5715 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 5716 #endif 5717 5718 static inline void register_as_ext3(void) 5719 { 5720 int err = register_filesystem(&ext3_fs_type); 5721 if (err) 5722 printk(KERN_WARNING 5723 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 5724 } 5725 5726 static inline void unregister_as_ext3(void) 5727 { 5728 unregister_filesystem(&ext3_fs_type); 5729 } 5730 5731 static inline int ext3_feature_set_ok(struct super_block *sb) 5732 { 5733 if (ext4_has_unknown_ext3_incompat_features(sb)) 5734 return 0; 5735 if (!ext4_has_feature_journal(sb)) 5736 return 0; 5737 if (sb->s_flags & MS_RDONLY) 5738 return 1; 5739 if (ext4_has_unknown_ext3_ro_compat_features(sb)) 5740 return 0; 5741 return 1; 5742 } 5743 5744 static struct file_system_type ext4_fs_type = { 5745 .owner = THIS_MODULE, 5746 .name = "ext4", 5747 .mount = ext4_mount, 5748 .kill_sb = kill_block_super, 5749 .fs_flags = FS_REQUIRES_DEV, 5750 }; 5751 MODULE_ALIAS_FS("ext4"); 5752 5753 /* Shared across all ext4 file systems */ 5754 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 5755 5756 static int __init ext4_init_fs(void) 5757 { 5758 int i, err; 5759 5760 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); 5761 ext4_li_info = NULL; 5762 mutex_init(&ext4_li_mtx); 5763 5764 /* Build-time check for flags consistency */ 5765 ext4_check_flag_values(); 5766 5767 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) 5768 init_waitqueue_head(&ext4__ioend_wq[i]); 5769 5770 err = ext4_init_es(); 5771 if (err) 5772 return err; 5773 5774 err = ext4_init_pageio(); 5775 if (err) 5776 goto out5; 5777 5778 err = ext4_init_system_zone(); 5779 if (err) 5780 goto out4; 5781 5782 err = ext4_init_sysfs(); 5783 if (err) 5784 goto out3; 5785 5786 err = ext4_init_mballoc(); 5787 if (err) 5788 goto out2; 5789 err = init_inodecache(); 5790 if (err) 5791 goto out1; 5792 register_as_ext3(); 5793 register_as_ext2(); 5794 err = register_filesystem(&ext4_fs_type); 5795 if (err) 5796 goto out; 5797 5798 return 0; 5799 out: 5800 unregister_as_ext2(); 5801 unregister_as_ext3(); 5802 destroy_inodecache(); 5803 out1: 5804 ext4_exit_mballoc(); 5805 out2: 5806 ext4_exit_sysfs(); 5807 out3: 5808 ext4_exit_system_zone(); 5809 out4: 5810 ext4_exit_pageio(); 5811 out5: 5812 ext4_exit_es(); 5813 5814 return err; 5815 } 5816 5817 static void __exit ext4_exit_fs(void) 5818 { 5819 ext4_destroy_lazyinit_thread(); 5820 unregister_as_ext2(); 5821 unregister_as_ext3(); 5822 unregister_filesystem(&ext4_fs_type); 5823 destroy_inodecache(); 5824 ext4_exit_mballoc(); 5825 ext4_exit_sysfs(); 5826 ext4_exit_system_zone(); 5827 ext4_exit_pageio(); 5828 ext4_exit_es(); 5829 } 5830 5831 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 5832 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5833 MODULE_LICENSE("GPL"); 5834 module_init(ext4_init_fs) 5835 module_exit(ext4_exit_fs) 5836