1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/vmalloc.h> 24 #include <linux/jbd2.h> 25 #include <linux/slab.h> 26 #include <linux/init.h> 27 #include <linux/blkdev.h> 28 #include <linux/parser.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <linux/vfs.h> 32 #include <linux/random.h> 33 #include <linux/mount.h> 34 #include <linux/namei.h> 35 #include <linux/quotaops.h> 36 #include <linux/seq_file.h> 37 #include <linux/proc_fs.h> 38 #include <linux/ctype.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 #include <linux/cleancache.h> 42 #include <asm/uaccess.h> 43 44 #include <linux/kthread.h> 45 #include <linux/freezer.h> 46 47 #include "ext4.h" 48 #include "ext4_extents.h" /* Needed for trace points definition */ 49 #include "ext4_jbd2.h" 50 #include "xattr.h" 51 #include "acl.h" 52 #include "mballoc.h" 53 54 #define CREATE_TRACE_POINTS 55 #include <trace/events/ext4.h> 56 57 static struct proc_dir_entry *ext4_proc_root; 58 static struct kset *ext4_kset; 59 static struct ext4_lazy_init *ext4_li_info; 60 static struct mutex ext4_li_mtx; 61 static struct ext4_features *ext4_feat; 62 63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 64 unsigned long journal_devnum); 65 static int ext4_show_options(struct seq_file *seq, struct dentry *root); 66 static int ext4_commit_super(struct super_block *sb, int sync); 67 static void ext4_mark_recovery_complete(struct super_block *sb, 68 struct ext4_super_block *es); 69 static void ext4_clear_journal_err(struct super_block *sb, 70 struct ext4_super_block *es); 71 static int ext4_sync_fs(struct super_block *sb, int wait); 72 static const char *ext4_decode_error(struct super_block *sb, int errno, 73 char nbuf[16]); 74 static int ext4_remount(struct super_block *sb, int *flags, char *data); 75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 76 static int ext4_unfreeze(struct super_block *sb); 77 static int ext4_freeze(struct super_block *sb); 78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 79 const char *dev_name, void *data); 80 static inline int ext2_feature_set_ok(struct super_block *sb); 81 static inline int ext3_feature_set_ok(struct super_block *sb); 82 static int ext4_feature_set_ok(struct super_block *sb, int readonly); 83 static void ext4_destroy_lazyinit_thread(void); 84 static void ext4_unregister_li_request(struct super_block *sb); 85 static void ext4_clear_request_list(void); 86 87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 88 static struct file_system_type ext2_fs_type = { 89 .owner = THIS_MODULE, 90 .name = "ext2", 91 .mount = ext4_mount, 92 .kill_sb = kill_block_super, 93 .fs_flags = FS_REQUIRES_DEV, 94 }; 95 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 96 #else 97 #define IS_EXT2_SB(sb) (0) 98 #endif 99 100 101 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 102 static struct file_system_type ext3_fs_type = { 103 .owner = THIS_MODULE, 104 .name = "ext3", 105 .mount = ext4_mount, 106 .kill_sb = kill_block_super, 107 .fs_flags = FS_REQUIRES_DEV, 108 }; 109 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 110 #else 111 #define IS_EXT3_SB(sb) (0) 112 #endif 113 114 static int ext4_verify_csum_type(struct super_block *sb, 115 struct ext4_super_block *es) 116 { 117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 119 return 1; 120 121 return es->s_checksum_type == EXT4_CRC32C_CHKSUM; 122 } 123 124 static __le32 ext4_superblock_csum(struct super_block *sb, 125 struct ext4_super_block *es) 126 { 127 struct ext4_sb_info *sbi = EXT4_SB(sb); 128 int offset = offsetof(struct ext4_super_block, s_checksum); 129 __u32 csum; 130 131 csum = ext4_chksum(sbi, ~0, (char *)es, offset); 132 133 return cpu_to_le32(csum); 134 } 135 136 int ext4_superblock_csum_verify(struct super_block *sb, 137 struct ext4_super_block *es) 138 { 139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 141 return 1; 142 143 return es->s_checksum == ext4_superblock_csum(sb, es); 144 } 145 146 void ext4_superblock_csum_set(struct super_block *sb) 147 { 148 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 149 150 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 151 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 152 return; 153 154 es->s_checksum = ext4_superblock_csum(sb, es); 155 } 156 157 void *ext4_kvmalloc(size_t size, gfp_t flags) 158 { 159 void *ret; 160 161 ret = kmalloc(size, flags); 162 if (!ret) 163 ret = __vmalloc(size, flags, PAGE_KERNEL); 164 return ret; 165 } 166 167 void *ext4_kvzalloc(size_t size, gfp_t flags) 168 { 169 void *ret; 170 171 ret = kzalloc(size, flags); 172 if (!ret) 173 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 174 return ret; 175 } 176 177 void ext4_kvfree(void *ptr) 178 { 179 if (is_vmalloc_addr(ptr)) 180 vfree(ptr); 181 else 182 kfree(ptr); 183 184 } 185 186 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 187 struct ext4_group_desc *bg) 188 { 189 return le32_to_cpu(bg->bg_block_bitmap_lo) | 190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 191 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 192 } 193 194 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 195 struct ext4_group_desc *bg) 196 { 197 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 200 } 201 202 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 203 struct ext4_group_desc *bg) 204 { 205 return le32_to_cpu(bg->bg_inode_table_lo) | 206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 207 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 208 } 209 210 __u32 ext4_free_group_clusters(struct super_block *sb, 211 struct ext4_group_desc *bg) 212 { 213 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 215 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 216 } 217 218 __u32 ext4_free_inodes_count(struct super_block *sb, 219 struct ext4_group_desc *bg) 220 { 221 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 223 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 224 } 225 226 __u32 ext4_used_dirs_count(struct super_block *sb, 227 struct ext4_group_desc *bg) 228 { 229 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 231 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 232 } 233 234 __u32 ext4_itable_unused_count(struct super_block *sb, 235 struct ext4_group_desc *bg) 236 { 237 return le16_to_cpu(bg->bg_itable_unused_lo) | 238 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 239 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 240 } 241 242 void ext4_block_bitmap_set(struct super_block *sb, 243 struct ext4_group_desc *bg, ext4_fsblk_t blk) 244 { 245 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 247 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 248 } 249 250 void ext4_inode_bitmap_set(struct super_block *sb, 251 struct ext4_group_desc *bg, ext4_fsblk_t blk) 252 { 253 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 255 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 256 } 257 258 void ext4_inode_table_set(struct super_block *sb, 259 struct ext4_group_desc *bg, ext4_fsblk_t blk) 260 { 261 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 263 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 264 } 265 266 void ext4_free_group_clusters_set(struct super_block *sb, 267 struct ext4_group_desc *bg, __u32 count) 268 { 269 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 271 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 272 } 273 274 void ext4_free_inodes_set(struct super_block *sb, 275 struct ext4_group_desc *bg, __u32 count) 276 { 277 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 279 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 280 } 281 282 void ext4_used_dirs_set(struct super_block *sb, 283 struct ext4_group_desc *bg, __u32 count) 284 { 285 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 287 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 288 } 289 290 void ext4_itable_unused_set(struct super_block *sb, 291 struct ext4_group_desc *bg, __u32 count) 292 { 293 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 294 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 295 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 296 } 297 298 299 /* Just increment the non-pointer handle value */ 300 static handle_t *ext4_get_nojournal(void) 301 { 302 handle_t *handle = current->journal_info; 303 unsigned long ref_cnt = (unsigned long)handle; 304 305 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); 306 307 ref_cnt++; 308 handle = (handle_t *)ref_cnt; 309 310 current->journal_info = handle; 311 return handle; 312 } 313 314 315 /* Decrement the non-pointer handle value */ 316 static void ext4_put_nojournal(handle_t *handle) 317 { 318 unsigned long ref_cnt = (unsigned long)handle; 319 320 BUG_ON(ref_cnt == 0); 321 322 ref_cnt--; 323 handle = (handle_t *)ref_cnt; 324 325 current->journal_info = handle; 326 } 327 328 /* 329 * Wrappers for jbd2_journal_start/end. 330 */ 331 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 332 { 333 journal_t *journal; 334 335 trace_ext4_journal_start(sb, nblocks, _RET_IP_); 336 if (sb->s_flags & MS_RDONLY) 337 return ERR_PTR(-EROFS); 338 339 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); 340 journal = EXT4_SB(sb)->s_journal; 341 if (!journal) 342 return ext4_get_nojournal(); 343 /* 344 * Special case here: if the journal has aborted behind our 345 * backs (eg. EIO in the commit thread), then we still need to 346 * take the FS itself readonly cleanly. 347 */ 348 if (is_journal_aborted(journal)) { 349 ext4_abort(sb, "Detected aborted journal"); 350 return ERR_PTR(-EROFS); 351 } 352 return jbd2_journal_start(journal, nblocks); 353 } 354 355 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) 356 { 357 struct super_block *sb; 358 int err; 359 int rc; 360 361 if (!ext4_handle_valid(handle)) { 362 ext4_put_nojournal(handle); 363 return 0; 364 } 365 sb = handle->h_transaction->t_journal->j_private; 366 err = handle->h_err; 367 rc = jbd2_journal_stop(handle); 368 369 if (!err) 370 err = rc; 371 if (err) 372 __ext4_std_error(sb, where, line, err); 373 return err; 374 } 375 376 void ext4_journal_abort_handle(const char *caller, unsigned int line, 377 const char *err_fn, struct buffer_head *bh, 378 handle_t *handle, int err) 379 { 380 char nbuf[16]; 381 const char *errstr = ext4_decode_error(NULL, err, nbuf); 382 383 BUG_ON(!ext4_handle_valid(handle)); 384 385 if (bh) 386 BUFFER_TRACE(bh, "abort"); 387 388 if (!handle->h_err) 389 handle->h_err = err; 390 391 if (is_handle_aborted(handle)) 392 return; 393 394 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n", 395 caller, line, errstr, err_fn); 396 397 jbd2_journal_abort_handle(handle); 398 } 399 400 static void __save_error_info(struct super_block *sb, const char *func, 401 unsigned int line) 402 { 403 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 404 405 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 406 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 407 es->s_last_error_time = cpu_to_le32(get_seconds()); 408 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 409 es->s_last_error_line = cpu_to_le32(line); 410 if (!es->s_first_error_time) { 411 es->s_first_error_time = es->s_last_error_time; 412 strncpy(es->s_first_error_func, func, 413 sizeof(es->s_first_error_func)); 414 es->s_first_error_line = cpu_to_le32(line); 415 es->s_first_error_ino = es->s_last_error_ino; 416 es->s_first_error_block = es->s_last_error_block; 417 } 418 /* 419 * Start the daily error reporting function if it hasn't been 420 * started already 421 */ 422 if (!es->s_error_count) 423 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 424 le32_add_cpu(&es->s_error_count, 1); 425 } 426 427 static void save_error_info(struct super_block *sb, const char *func, 428 unsigned int line) 429 { 430 __save_error_info(sb, func, line); 431 ext4_commit_super(sb, 1); 432 } 433 434 /* 435 * The del_gendisk() function uninitializes the disk-specific data 436 * structures, including the bdi structure, without telling anyone 437 * else. Once this happens, any attempt to call mark_buffer_dirty() 438 * (for example, by ext4_commit_super), will cause a kernel OOPS. 439 * This is a kludge to prevent these oops until we can put in a proper 440 * hook in del_gendisk() to inform the VFS and file system layers. 441 */ 442 static int block_device_ejected(struct super_block *sb) 443 { 444 struct inode *bd_inode = sb->s_bdev->bd_inode; 445 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info; 446 447 return bdi->dev == NULL; 448 } 449 450 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 451 { 452 struct super_block *sb = journal->j_private; 453 struct ext4_sb_info *sbi = EXT4_SB(sb); 454 int error = is_journal_aborted(journal); 455 struct ext4_journal_cb_entry *jce, *tmp; 456 457 spin_lock(&sbi->s_md_lock); 458 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) { 459 list_del_init(&jce->jce_list); 460 spin_unlock(&sbi->s_md_lock); 461 jce->jce_func(sb, jce, error); 462 spin_lock(&sbi->s_md_lock); 463 } 464 spin_unlock(&sbi->s_md_lock); 465 } 466 467 /* Deal with the reporting of failure conditions on a filesystem such as 468 * inconsistencies detected or read IO failures. 469 * 470 * On ext2, we can store the error state of the filesystem in the 471 * superblock. That is not possible on ext4, because we may have other 472 * write ordering constraints on the superblock which prevent us from 473 * writing it out straight away; and given that the journal is about to 474 * be aborted, we can't rely on the current, or future, transactions to 475 * write out the superblock safely. 476 * 477 * We'll just use the jbd2_journal_abort() error code to record an error in 478 * the journal instead. On recovery, the journal will complain about 479 * that error until we've noted it down and cleared it. 480 */ 481 482 static void ext4_handle_error(struct super_block *sb) 483 { 484 if (sb->s_flags & MS_RDONLY) 485 return; 486 487 if (!test_opt(sb, ERRORS_CONT)) { 488 journal_t *journal = EXT4_SB(sb)->s_journal; 489 490 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 491 if (journal) 492 jbd2_journal_abort(journal, -EIO); 493 } 494 if (test_opt(sb, ERRORS_RO)) { 495 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 496 sb->s_flags |= MS_RDONLY; 497 } 498 if (test_opt(sb, ERRORS_PANIC)) 499 panic("EXT4-fs (device %s): panic forced after error\n", 500 sb->s_id); 501 } 502 503 void __ext4_error(struct super_block *sb, const char *function, 504 unsigned int line, const char *fmt, ...) 505 { 506 struct va_format vaf; 507 va_list args; 508 509 va_start(args, fmt); 510 vaf.fmt = fmt; 511 vaf.va = &args; 512 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 513 sb->s_id, function, line, current->comm, &vaf); 514 va_end(args); 515 save_error_info(sb, function, line); 516 517 ext4_handle_error(sb); 518 } 519 520 void ext4_error_inode(struct inode *inode, const char *function, 521 unsigned int line, ext4_fsblk_t block, 522 const char *fmt, ...) 523 { 524 va_list args; 525 struct va_format vaf; 526 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 527 528 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 529 es->s_last_error_block = cpu_to_le64(block); 530 save_error_info(inode->i_sb, function, line); 531 va_start(args, fmt); 532 vaf.fmt = fmt; 533 vaf.va = &args; 534 if (block) 535 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 536 "inode #%lu: block %llu: comm %s: %pV\n", 537 inode->i_sb->s_id, function, line, inode->i_ino, 538 block, current->comm, &vaf); 539 else 540 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " 541 "inode #%lu: comm %s: %pV\n", 542 inode->i_sb->s_id, function, line, inode->i_ino, 543 current->comm, &vaf); 544 va_end(args); 545 546 ext4_handle_error(inode->i_sb); 547 } 548 549 void ext4_error_file(struct file *file, const char *function, 550 unsigned int line, ext4_fsblk_t block, 551 const char *fmt, ...) 552 { 553 va_list args; 554 struct va_format vaf; 555 struct ext4_super_block *es; 556 struct inode *inode = file->f_dentry->d_inode; 557 char pathname[80], *path; 558 559 es = EXT4_SB(inode->i_sb)->s_es; 560 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 561 save_error_info(inode->i_sb, function, line); 562 path = d_path(&(file->f_path), pathname, sizeof(pathname)); 563 if (IS_ERR(path)) 564 path = "(unknown)"; 565 va_start(args, fmt); 566 vaf.fmt = fmt; 567 vaf.va = &args; 568 if (block) 569 printk(KERN_CRIT 570 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 571 "block %llu: comm %s: path %s: %pV\n", 572 inode->i_sb->s_id, function, line, inode->i_ino, 573 block, current->comm, path, &vaf); 574 else 575 printk(KERN_CRIT 576 "EXT4-fs error (device %s): %s:%d: inode #%lu: " 577 "comm %s: path %s: %pV\n", 578 inode->i_sb->s_id, function, line, inode->i_ino, 579 current->comm, path, &vaf); 580 va_end(args); 581 582 ext4_handle_error(inode->i_sb); 583 } 584 585 static const char *ext4_decode_error(struct super_block *sb, int errno, 586 char nbuf[16]) 587 { 588 char *errstr = NULL; 589 590 switch (errno) { 591 case -EIO: 592 errstr = "IO failure"; 593 break; 594 case -ENOMEM: 595 errstr = "Out of memory"; 596 break; 597 case -EROFS: 598 if (!sb || (EXT4_SB(sb)->s_journal && 599 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 600 errstr = "Journal has aborted"; 601 else 602 errstr = "Readonly filesystem"; 603 break; 604 default: 605 /* If the caller passed in an extra buffer for unknown 606 * errors, textualise them now. Else we just return 607 * NULL. */ 608 if (nbuf) { 609 /* Check for truncated error codes... */ 610 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 611 errstr = nbuf; 612 } 613 break; 614 } 615 616 return errstr; 617 } 618 619 /* __ext4_std_error decodes expected errors from journaling functions 620 * automatically and invokes the appropriate error response. */ 621 622 void __ext4_std_error(struct super_block *sb, const char *function, 623 unsigned int line, int errno) 624 { 625 char nbuf[16]; 626 const char *errstr; 627 628 /* Special case: if the error is EROFS, and we're not already 629 * inside a transaction, then there's really no point in logging 630 * an error. */ 631 if (errno == -EROFS && journal_current_handle() == NULL && 632 (sb->s_flags & MS_RDONLY)) 633 return; 634 635 errstr = ext4_decode_error(sb, errno, nbuf); 636 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 637 sb->s_id, function, line, errstr); 638 save_error_info(sb, function, line); 639 640 ext4_handle_error(sb); 641 } 642 643 /* 644 * ext4_abort is a much stronger failure handler than ext4_error. The 645 * abort function may be used to deal with unrecoverable failures such 646 * as journal IO errors or ENOMEM at a critical moment in log management. 647 * 648 * We unconditionally force the filesystem into an ABORT|READONLY state, 649 * unless the error response on the fs has been set to panic in which 650 * case we take the easy way out and panic immediately. 651 */ 652 653 void __ext4_abort(struct super_block *sb, const char *function, 654 unsigned int line, const char *fmt, ...) 655 { 656 va_list args; 657 658 save_error_info(sb, function, line); 659 va_start(args, fmt); 660 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 661 function, line); 662 vprintk(fmt, args); 663 printk("\n"); 664 va_end(args); 665 666 if ((sb->s_flags & MS_RDONLY) == 0) { 667 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 668 sb->s_flags |= MS_RDONLY; 669 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 670 if (EXT4_SB(sb)->s_journal) 671 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 672 save_error_info(sb, function, line); 673 } 674 if (test_opt(sb, ERRORS_PANIC)) 675 panic("EXT4-fs panic from previous error\n"); 676 } 677 678 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) 679 { 680 struct va_format vaf; 681 va_list args; 682 683 va_start(args, fmt); 684 vaf.fmt = fmt; 685 vaf.va = &args; 686 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 687 va_end(args); 688 } 689 690 void __ext4_warning(struct super_block *sb, const char *function, 691 unsigned int line, const char *fmt, ...) 692 { 693 struct va_format vaf; 694 va_list args; 695 696 va_start(args, fmt); 697 vaf.fmt = fmt; 698 vaf.va = &args; 699 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 700 sb->s_id, function, line, &vaf); 701 va_end(args); 702 } 703 704 void __ext4_grp_locked_error(const char *function, unsigned int line, 705 struct super_block *sb, ext4_group_t grp, 706 unsigned long ino, ext4_fsblk_t block, 707 const char *fmt, ...) 708 __releases(bitlock) 709 __acquires(bitlock) 710 { 711 struct va_format vaf; 712 va_list args; 713 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 714 715 es->s_last_error_ino = cpu_to_le32(ino); 716 es->s_last_error_block = cpu_to_le64(block); 717 __save_error_info(sb, function, line); 718 719 va_start(args, fmt); 720 721 vaf.fmt = fmt; 722 vaf.va = &args; 723 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 724 sb->s_id, function, line, grp); 725 if (ino) 726 printk(KERN_CONT "inode %lu: ", ino); 727 if (block) 728 printk(KERN_CONT "block %llu:", (unsigned long long) block); 729 printk(KERN_CONT "%pV\n", &vaf); 730 va_end(args); 731 732 if (test_opt(sb, ERRORS_CONT)) { 733 ext4_commit_super(sb, 0); 734 return; 735 } 736 737 ext4_unlock_group(sb, grp); 738 ext4_handle_error(sb); 739 /* 740 * We only get here in the ERRORS_RO case; relocking the group 741 * may be dangerous, but nothing bad will happen since the 742 * filesystem will have already been marked read/only and the 743 * journal has been aborted. We return 1 as a hint to callers 744 * who might what to use the return value from 745 * ext4_grp_locked_error() to distinguish between the 746 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 747 * aggressively from the ext4 function in question, with a 748 * more appropriate error code. 749 */ 750 ext4_lock_group(sb, grp); 751 return; 752 } 753 754 void ext4_update_dynamic_rev(struct super_block *sb) 755 { 756 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 757 758 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 759 return; 760 761 ext4_warning(sb, 762 "updating to rev %d because of new feature flag, " 763 "running e2fsck is recommended", 764 EXT4_DYNAMIC_REV); 765 766 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 767 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 768 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 769 /* leave es->s_feature_*compat flags alone */ 770 /* es->s_uuid will be set by e2fsck if empty */ 771 772 /* 773 * The rest of the superblock fields should be zero, and if not it 774 * means they are likely already in use, so leave them alone. We 775 * can leave it up to e2fsck to clean up any inconsistencies there. 776 */ 777 } 778 779 /* 780 * Open the external journal device 781 */ 782 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 783 { 784 struct block_device *bdev; 785 char b[BDEVNAME_SIZE]; 786 787 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 788 if (IS_ERR(bdev)) 789 goto fail; 790 return bdev; 791 792 fail: 793 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 794 __bdevname(dev, b), PTR_ERR(bdev)); 795 return NULL; 796 } 797 798 /* 799 * Release the journal device 800 */ 801 static int ext4_blkdev_put(struct block_device *bdev) 802 { 803 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 804 } 805 806 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 807 { 808 struct block_device *bdev; 809 int ret = -ENODEV; 810 811 bdev = sbi->journal_bdev; 812 if (bdev) { 813 ret = ext4_blkdev_put(bdev); 814 sbi->journal_bdev = NULL; 815 } 816 return ret; 817 } 818 819 static inline struct inode *orphan_list_entry(struct list_head *l) 820 { 821 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 822 } 823 824 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 825 { 826 struct list_head *l; 827 828 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 829 le32_to_cpu(sbi->s_es->s_last_orphan)); 830 831 printk(KERN_ERR "sb_info orphan list:\n"); 832 list_for_each(l, &sbi->s_orphan) { 833 struct inode *inode = orphan_list_entry(l); 834 printk(KERN_ERR " " 835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 836 inode->i_sb->s_id, inode->i_ino, inode, 837 inode->i_mode, inode->i_nlink, 838 NEXT_ORPHAN(inode)); 839 } 840 } 841 842 static void ext4_put_super(struct super_block *sb) 843 { 844 struct ext4_sb_info *sbi = EXT4_SB(sb); 845 struct ext4_super_block *es = sbi->s_es; 846 int i, err; 847 848 ext4_unregister_li_request(sb); 849 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 850 851 flush_workqueue(sbi->dio_unwritten_wq); 852 destroy_workqueue(sbi->dio_unwritten_wq); 853 854 if (sbi->s_journal) { 855 err = jbd2_journal_destroy(sbi->s_journal); 856 sbi->s_journal = NULL; 857 if (err < 0) 858 ext4_abort(sb, "Couldn't clean up the journal"); 859 } 860 861 del_timer(&sbi->s_err_report); 862 ext4_release_system_zone(sb); 863 ext4_mb_release(sb); 864 ext4_ext_release(sb); 865 ext4_xattr_put_super(sb); 866 867 if (!(sb->s_flags & MS_RDONLY)) { 868 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 869 es->s_state = cpu_to_le16(sbi->s_mount_state); 870 } 871 if (!(sb->s_flags & MS_RDONLY)) 872 ext4_commit_super(sb, 1); 873 874 if (sbi->s_proc) { 875 remove_proc_entry("options", sbi->s_proc); 876 remove_proc_entry(sb->s_id, ext4_proc_root); 877 } 878 kobject_del(&sbi->s_kobj); 879 880 for (i = 0; i < sbi->s_gdb_count; i++) 881 brelse(sbi->s_group_desc[i]); 882 ext4_kvfree(sbi->s_group_desc); 883 ext4_kvfree(sbi->s_flex_groups); 884 percpu_counter_destroy(&sbi->s_freeclusters_counter); 885 percpu_counter_destroy(&sbi->s_freeinodes_counter); 886 percpu_counter_destroy(&sbi->s_dirs_counter); 887 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 888 brelse(sbi->s_sbh); 889 #ifdef CONFIG_QUOTA 890 for (i = 0; i < MAXQUOTAS; i++) 891 kfree(sbi->s_qf_names[i]); 892 #endif 893 894 /* Debugging code just in case the in-memory inode orphan list 895 * isn't empty. The on-disk one can be non-empty if we've 896 * detected an error and taken the fs readonly, but the 897 * in-memory list had better be clean by this point. */ 898 if (!list_empty(&sbi->s_orphan)) 899 dump_orphan_list(sb, sbi); 900 J_ASSERT(list_empty(&sbi->s_orphan)); 901 902 invalidate_bdev(sb->s_bdev); 903 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 904 /* 905 * Invalidate the journal device's buffers. We don't want them 906 * floating about in memory - the physical journal device may 907 * hotswapped, and it breaks the `ro-after' testing code. 908 */ 909 sync_blockdev(sbi->journal_bdev); 910 invalidate_bdev(sbi->journal_bdev); 911 ext4_blkdev_remove(sbi); 912 } 913 if (sbi->s_mmp_tsk) 914 kthread_stop(sbi->s_mmp_tsk); 915 sb->s_fs_info = NULL; 916 /* 917 * Now that we are completely done shutting down the 918 * superblock, we need to actually destroy the kobject. 919 */ 920 kobject_put(&sbi->s_kobj); 921 wait_for_completion(&sbi->s_kobj_unregister); 922 if (sbi->s_chksum_driver) 923 crypto_free_shash(sbi->s_chksum_driver); 924 kfree(sbi->s_blockgroup_lock); 925 kfree(sbi); 926 } 927 928 static struct kmem_cache *ext4_inode_cachep; 929 930 /* 931 * Called inside transaction, so use GFP_NOFS 932 */ 933 static struct inode *ext4_alloc_inode(struct super_block *sb) 934 { 935 struct ext4_inode_info *ei; 936 937 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 938 if (!ei) 939 return NULL; 940 941 ei->vfs_inode.i_version = 1; 942 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 943 INIT_LIST_HEAD(&ei->i_prealloc_list); 944 spin_lock_init(&ei->i_prealloc_lock); 945 ext4_es_init_tree(&ei->i_es_tree); 946 rwlock_init(&ei->i_es_lock); 947 ei->i_reserved_data_blocks = 0; 948 ei->i_reserved_meta_blocks = 0; 949 ei->i_allocated_meta_blocks = 0; 950 ei->i_da_metadata_calc_len = 0; 951 ei->i_da_metadata_calc_last_lblock = 0; 952 spin_lock_init(&(ei->i_block_reservation_lock)); 953 #ifdef CONFIG_QUOTA 954 ei->i_reserved_quota = 0; 955 #endif 956 ei->jinode = NULL; 957 INIT_LIST_HEAD(&ei->i_completed_io_list); 958 spin_lock_init(&ei->i_completed_io_lock); 959 ei->i_sync_tid = 0; 960 ei->i_datasync_tid = 0; 961 atomic_set(&ei->i_ioend_count, 0); 962 atomic_set(&ei->i_unwritten, 0); 963 964 return &ei->vfs_inode; 965 } 966 967 static int ext4_drop_inode(struct inode *inode) 968 { 969 int drop = generic_drop_inode(inode); 970 971 trace_ext4_drop_inode(inode, drop); 972 return drop; 973 } 974 975 static void ext4_i_callback(struct rcu_head *head) 976 { 977 struct inode *inode = container_of(head, struct inode, i_rcu); 978 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 979 } 980 981 static void ext4_destroy_inode(struct inode *inode) 982 { 983 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 984 ext4_msg(inode->i_sb, KERN_ERR, 985 "Inode %lu (%p): orphan list check failed!", 986 inode->i_ino, EXT4_I(inode)); 987 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 988 EXT4_I(inode), sizeof(struct ext4_inode_info), 989 true); 990 dump_stack(); 991 } 992 call_rcu(&inode->i_rcu, ext4_i_callback); 993 } 994 995 static void init_once(void *foo) 996 { 997 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 998 999 INIT_LIST_HEAD(&ei->i_orphan); 1000 init_rwsem(&ei->xattr_sem); 1001 init_rwsem(&ei->i_data_sem); 1002 inode_init_once(&ei->vfs_inode); 1003 } 1004 1005 static int init_inodecache(void) 1006 { 1007 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 1008 sizeof(struct ext4_inode_info), 1009 0, (SLAB_RECLAIM_ACCOUNT| 1010 SLAB_MEM_SPREAD), 1011 init_once); 1012 if (ext4_inode_cachep == NULL) 1013 return -ENOMEM; 1014 return 0; 1015 } 1016 1017 static void destroy_inodecache(void) 1018 { 1019 /* 1020 * Make sure all delayed rcu free inodes are flushed before we 1021 * destroy cache. 1022 */ 1023 rcu_barrier(); 1024 kmem_cache_destroy(ext4_inode_cachep); 1025 } 1026 1027 void ext4_clear_inode(struct inode *inode) 1028 { 1029 invalidate_inode_buffers(inode); 1030 clear_inode(inode); 1031 dquot_drop(inode); 1032 ext4_discard_preallocations(inode); 1033 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); 1034 if (EXT4_I(inode)->jinode) { 1035 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 1036 EXT4_I(inode)->jinode); 1037 jbd2_free_inode(EXT4_I(inode)->jinode); 1038 EXT4_I(inode)->jinode = NULL; 1039 } 1040 } 1041 1042 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1043 u64 ino, u32 generation) 1044 { 1045 struct inode *inode; 1046 1047 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1048 return ERR_PTR(-ESTALE); 1049 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1050 return ERR_PTR(-ESTALE); 1051 1052 /* iget isn't really right if the inode is currently unallocated!! 1053 * 1054 * ext4_read_inode will return a bad_inode if the inode had been 1055 * deleted, so we should be safe. 1056 * 1057 * Currently we don't know the generation for parent directory, so 1058 * a generation of 0 means "accept any" 1059 */ 1060 inode = ext4_iget(sb, ino); 1061 if (IS_ERR(inode)) 1062 return ERR_CAST(inode); 1063 if (generation && inode->i_generation != generation) { 1064 iput(inode); 1065 return ERR_PTR(-ESTALE); 1066 } 1067 1068 return inode; 1069 } 1070 1071 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1072 int fh_len, int fh_type) 1073 { 1074 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1075 ext4_nfs_get_inode); 1076 } 1077 1078 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1079 int fh_len, int fh_type) 1080 { 1081 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1082 ext4_nfs_get_inode); 1083 } 1084 1085 /* 1086 * Try to release metadata pages (indirect blocks, directories) which are 1087 * mapped via the block device. Since these pages could have journal heads 1088 * which would prevent try_to_free_buffers() from freeing them, we must use 1089 * jbd2 layer's try_to_free_buffers() function to release them. 1090 */ 1091 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1092 gfp_t wait) 1093 { 1094 journal_t *journal = EXT4_SB(sb)->s_journal; 1095 1096 WARN_ON(PageChecked(page)); 1097 if (!page_has_buffers(page)) 1098 return 0; 1099 if (journal) 1100 return jbd2_journal_try_to_free_buffers(journal, page, 1101 wait & ~__GFP_WAIT); 1102 return try_to_free_buffers(page); 1103 } 1104 1105 #ifdef CONFIG_QUOTA 1106 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 1107 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 1108 1109 static int ext4_write_dquot(struct dquot *dquot); 1110 static int ext4_acquire_dquot(struct dquot *dquot); 1111 static int ext4_release_dquot(struct dquot *dquot); 1112 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1113 static int ext4_write_info(struct super_block *sb, int type); 1114 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1115 struct path *path); 1116 static int ext4_quota_on_sysfile(struct super_block *sb, int type, 1117 int format_id); 1118 static int ext4_quota_off(struct super_block *sb, int type); 1119 static int ext4_quota_off_sysfile(struct super_block *sb, int type); 1120 static int ext4_quota_on_mount(struct super_block *sb, int type); 1121 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1122 size_t len, loff_t off); 1123 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1124 const char *data, size_t len, loff_t off); 1125 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 1126 unsigned int flags); 1127 static int ext4_enable_quotas(struct super_block *sb); 1128 1129 static const struct dquot_operations ext4_quota_operations = { 1130 .get_reserved_space = ext4_get_reserved_space, 1131 .write_dquot = ext4_write_dquot, 1132 .acquire_dquot = ext4_acquire_dquot, 1133 .release_dquot = ext4_release_dquot, 1134 .mark_dirty = ext4_mark_dquot_dirty, 1135 .write_info = ext4_write_info, 1136 .alloc_dquot = dquot_alloc, 1137 .destroy_dquot = dquot_destroy, 1138 }; 1139 1140 static const struct quotactl_ops ext4_qctl_operations = { 1141 .quota_on = ext4_quota_on, 1142 .quota_off = ext4_quota_off, 1143 .quota_sync = dquot_quota_sync, 1144 .get_info = dquot_get_dqinfo, 1145 .set_info = dquot_set_dqinfo, 1146 .get_dqblk = dquot_get_dqblk, 1147 .set_dqblk = dquot_set_dqblk 1148 }; 1149 1150 static const struct quotactl_ops ext4_qctl_sysfile_operations = { 1151 .quota_on_meta = ext4_quota_on_sysfile, 1152 .quota_off = ext4_quota_off_sysfile, 1153 .quota_sync = dquot_quota_sync, 1154 .get_info = dquot_get_dqinfo, 1155 .set_info = dquot_set_dqinfo, 1156 .get_dqblk = dquot_get_dqblk, 1157 .set_dqblk = dquot_set_dqblk 1158 }; 1159 #endif 1160 1161 static const struct super_operations ext4_sops = { 1162 .alloc_inode = ext4_alloc_inode, 1163 .destroy_inode = ext4_destroy_inode, 1164 .write_inode = ext4_write_inode, 1165 .dirty_inode = ext4_dirty_inode, 1166 .drop_inode = ext4_drop_inode, 1167 .evict_inode = ext4_evict_inode, 1168 .put_super = ext4_put_super, 1169 .sync_fs = ext4_sync_fs, 1170 .freeze_fs = ext4_freeze, 1171 .unfreeze_fs = ext4_unfreeze, 1172 .statfs = ext4_statfs, 1173 .remount_fs = ext4_remount, 1174 .show_options = ext4_show_options, 1175 #ifdef CONFIG_QUOTA 1176 .quota_read = ext4_quota_read, 1177 .quota_write = ext4_quota_write, 1178 #endif 1179 .bdev_try_to_free_page = bdev_try_to_free_page, 1180 }; 1181 1182 static const struct super_operations ext4_nojournal_sops = { 1183 .alloc_inode = ext4_alloc_inode, 1184 .destroy_inode = ext4_destroy_inode, 1185 .write_inode = ext4_write_inode, 1186 .dirty_inode = ext4_dirty_inode, 1187 .drop_inode = ext4_drop_inode, 1188 .evict_inode = ext4_evict_inode, 1189 .put_super = ext4_put_super, 1190 .statfs = ext4_statfs, 1191 .remount_fs = ext4_remount, 1192 .show_options = ext4_show_options, 1193 #ifdef CONFIG_QUOTA 1194 .quota_read = ext4_quota_read, 1195 .quota_write = ext4_quota_write, 1196 #endif 1197 .bdev_try_to_free_page = bdev_try_to_free_page, 1198 }; 1199 1200 static const struct export_operations ext4_export_ops = { 1201 .fh_to_dentry = ext4_fh_to_dentry, 1202 .fh_to_parent = ext4_fh_to_parent, 1203 .get_parent = ext4_get_parent, 1204 }; 1205 1206 enum { 1207 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1208 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1209 Opt_nouid32, Opt_debug, Opt_removed, 1210 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1211 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 1212 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1213 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit, 1214 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1215 Opt_data_err_abort, Opt_data_err_ignore, 1216 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1217 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1218 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1219 Opt_usrquota, Opt_grpquota, Opt_i_version, 1220 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 1221 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1222 Opt_inode_readahead_blks, Opt_journal_ioprio, 1223 Opt_dioread_nolock, Opt_dioread_lock, 1224 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1225 Opt_max_dir_size_kb, 1226 }; 1227 1228 static const match_table_t tokens = { 1229 {Opt_bsd_df, "bsddf"}, 1230 {Opt_minix_df, "minixdf"}, 1231 {Opt_grpid, "grpid"}, 1232 {Opt_grpid, "bsdgroups"}, 1233 {Opt_nogrpid, "nogrpid"}, 1234 {Opt_nogrpid, "sysvgroups"}, 1235 {Opt_resgid, "resgid=%u"}, 1236 {Opt_resuid, "resuid=%u"}, 1237 {Opt_sb, "sb=%u"}, 1238 {Opt_err_cont, "errors=continue"}, 1239 {Opt_err_panic, "errors=panic"}, 1240 {Opt_err_ro, "errors=remount-ro"}, 1241 {Opt_nouid32, "nouid32"}, 1242 {Opt_debug, "debug"}, 1243 {Opt_removed, "oldalloc"}, 1244 {Opt_removed, "orlov"}, 1245 {Opt_user_xattr, "user_xattr"}, 1246 {Opt_nouser_xattr, "nouser_xattr"}, 1247 {Opt_acl, "acl"}, 1248 {Opt_noacl, "noacl"}, 1249 {Opt_noload, "norecovery"}, 1250 {Opt_noload, "noload"}, 1251 {Opt_removed, "nobh"}, 1252 {Opt_removed, "bh"}, 1253 {Opt_commit, "commit=%u"}, 1254 {Opt_min_batch_time, "min_batch_time=%u"}, 1255 {Opt_max_batch_time, "max_batch_time=%u"}, 1256 {Opt_journal_dev, "journal_dev=%u"}, 1257 {Opt_journal_checksum, "journal_checksum"}, 1258 {Opt_journal_async_commit, "journal_async_commit"}, 1259 {Opt_abort, "abort"}, 1260 {Opt_data_journal, "data=journal"}, 1261 {Opt_data_ordered, "data=ordered"}, 1262 {Opt_data_writeback, "data=writeback"}, 1263 {Opt_data_err_abort, "data_err=abort"}, 1264 {Opt_data_err_ignore, "data_err=ignore"}, 1265 {Opt_offusrjquota, "usrjquota="}, 1266 {Opt_usrjquota, "usrjquota=%s"}, 1267 {Opt_offgrpjquota, "grpjquota="}, 1268 {Opt_grpjquota, "grpjquota=%s"}, 1269 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1270 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1271 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1272 {Opt_grpquota, "grpquota"}, 1273 {Opt_noquota, "noquota"}, 1274 {Opt_quota, "quota"}, 1275 {Opt_usrquota, "usrquota"}, 1276 {Opt_barrier, "barrier=%u"}, 1277 {Opt_barrier, "barrier"}, 1278 {Opt_nobarrier, "nobarrier"}, 1279 {Opt_i_version, "i_version"}, 1280 {Opt_stripe, "stripe=%u"}, 1281 {Opt_delalloc, "delalloc"}, 1282 {Opt_nodelalloc, "nodelalloc"}, 1283 {Opt_mblk_io_submit, "mblk_io_submit"}, 1284 {Opt_nomblk_io_submit, "nomblk_io_submit"}, 1285 {Opt_block_validity, "block_validity"}, 1286 {Opt_noblock_validity, "noblock_validity"}, 1287 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1288 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1289 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1290 {Opt_auto_da_alloc, "auto_da_alloc"}, 1291 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1292 {Opt_dioread_nolock, "dioread_nolock"}, 1293 {Opt_dioread_lock, "dioread_lock"}, 1294 {Opt_discard, "discard"}, 1295 {Opt_nodiscard, "nodiscard"}, 1296 {Opt_init_itable, "init_itable=%u"}, 1297 {Opt_init_itable, "init_itable"}, 1298 {Opt_noinit_itable, "noinit_itable"}, 1299 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, 1300 {Opt_removed, "check=none"}, /* mount option from ext2/3 */ 1301 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ 1302 {Opt_removed, "reservation"}, /* mount option from ext2/3 */ 1303 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ 1304 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ 1305 {Opt_err, NULL}, 1306 }; 1307 1308 static ext4_fsblk_t get_sb_block(void **data) 1309 { 1310 ext4_fsblk_t sb_block; 1311 char *options = (char *) *data; 1312 1313 if (!options || strncmp(options, "sb=", 3) != 0) 1314 return 1; /* Default location */ 1315 1316 options += 3; 1317 /* TODO: use simple_strtoll with >32bit ext4 */ 1318 sb_block = simple_strtoul(options, &options, 0); 1319 if (*options && *options != ',') { 1320 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1321 (char *) *data); 1322 return 1; 1323 } 1324 if (*options == ',') 1325 options++; 1326 *data = (void *) options; 1327 1328 return sb_block; 1329 } 1330 1331 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1332 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1333 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1334 1335 #ifdef CONFIG_QUOTA 1336 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1337 { 1338 struct ext4_sb_info *sbi = EXT4_SB(sb); 1339 char *qname; 1340 1341 if (sb_any_quota_loaded(sb) && 1342 !sbi->s_qf_names[qtype]) { 1343 ext4_msg(sb, KERN_ERR, 1344 "Cannot change journaled " 1345 "quota options when quota turned on"); 1346 return -1; 1347 } 1348 qname = match_strdup(args); 1349 if (!qname) { 1350 ext4_msg(sb, KERN_ERR, 1351 "Not enough memory for storing quotafile name"); 1352 return -1; 1353 } 1354 if (sbi->s_qf_names[qtype] && 1355 strcmp(sbi->s_qf_names[qtype], qname)) { 1356 ext4_msg(sb, KERN_ERR, 1357 "%s quota file already specified", QTYPE2NAME(qtype)); 1358 kfree(qname); 1359 return -1; 1360 } 1361 sbi->s_qf_names[qtype] = qname; 1362 if (strchr(sbi->s_qf_names[qtype], '/')) { 1363 ext4_msg(sb, KERN_ERR, 1364 "quotafile must be on filesystem root"); 1365 kfree(sbi->s_qf_names[qtype]); 1366 sbi->s_qf_names[qtype] = NULL; 1367 return -1; 1368 } 1369 set_opt(sb, QUOTA); 1370 return 1; 1371 } 1372 1373 static int clear_qf_name(struct super_block *sb, int qtype) 1374 { 1375 1376 struct ext4_sb_info *sbi = EXT4_SB(sb); 1377 1378 if (sb_any_quota_loaded(sb) && 1379 sbi->s_qf_names[qtype]) { 1380 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1381 " when quota turned on"); 1382 return -1; 1383 } 1384 /* 1385 * The space will be released later when all options are confirmed 1386 * to be correct 1387 */ 1388 sbi->s_qf_names[qtype] = NULL; 1389 return 1; 1390 } 1391 #endif 1392 1393 #define MOPT_SET 0x0001 1394 #define MOPT_CLEAR 0x0002 1395 #define MOPT_NOSUPPORT 0x0004 1396 #define MOPT_EXPLICIT 0x0008 1397 #define MOPT_CLEAR_ERR 0x0010 1398 #define MOPT_GTE0 0x0020 1399 #ifdef CONFIG_QUOTA 1400 #define MOPT_Q 0 1401 #define MOPT_QFMT 0x0040 1402 #else 1403 #define MOPT_Q MOPT_NOSUPPORT 1404 #define MOPT_QFMT MOPT_NOSUPPORT 1405 #endif 1406 #define MOPT_DATAJ 0x0080 1407 1408 static const struct mount_opts { 1409 int token; 1410 int mount_opt; 1411 int flags; 1412 } ext4_mount_opts[] = { 1413 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, 1414 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, 1415 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, 1416 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, 1417 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET}, 1418 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR}, 1419 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, 1420 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, 1421 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET}, 1422 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR}, 1423 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, 1424 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, 1425 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT}, 1426 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT}, 1427 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET}, 1428 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | 1429 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET}, 1430 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET}, 1431 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, 1432 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, 1433 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, 1434 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET}, 1435 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR}, 1436 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, 1437 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, 1438 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, 1439 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, 1440 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, 1441 {Opt_commit, 0, MOPT_GTE0}, 1442 {Opt_max_batch_time, 0, MOPT_GTE0}, 1443 {Opt_min_batch_time, 0, MOPT_GTE0}, 1444 {Opt_inode_readahead_blks, 0, MOPT_GTE0}, 1445 {Opt_init_itable, 0, MOPT_GTE0}, 1446 {Opt_stripe, 0, MOPT_GTE0}, 1447 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ}, 1448 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ}, 1449 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ}, 1450 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, 1451 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, 1452 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1453 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, 1454 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, 1455 #else 1456 {Opt_acl, 0, MOPT_NOSUPPORT}, 1457 {Opt_noacl, 0, MOPT_NOSUPPORT}, 1458 #endif 1459 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, 1460 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, 1461 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, 1462 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, 1463 MOPT_SET | MOPT_Q}, 1464 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, 1465 MOPT_SET | MOPT_Q}, 1466 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | 1467 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q}, 1468 {Opt_usrjquota, 0, MOPT_Q}, 1469 {Opt_grpjquota, 0, MOPT_Q}, 1470 {Opt_offusrjquota, 0, MOPT_Q}, 1471 {Opt_offgrpjquota, 0, MOPT_Q}, 1472 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, 1473 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, 1474 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, 1475 {Opt_max_dir_size_kb, 0, MOPT_GTE0}, 1476 {Opt_err, 0, 0} 1477 }; 1478 1479 static int handle_mount_opt(struct super_block *sb, char *opt, int token, 1480 substring_t *args, unsigned long *journal_devnum, 1481 unsigned int *journal_ioprio, int is_remount) 1482 { 1483 struct ext4_sb_info *sbi = EXT4_SB(sb); 1484 const struct mount_opts *m; 1485 kuid_t uid; 1486 kgid_t gid; 1487 int arg = 0; 1488 1489 #ifdef CONFIG_QUOTA 1490 if (token == Opt_usrjquota) 1491 return set_qf_name(sb, USRQUOTA, &args[0]); 1492 else if (token == Opt_grpjquota) 1493 return set_qf_name(sb, GRPQUOTA, &args[0]); 1494 else if (token == Opt_offusrjquota) 1495 return clear_qf_name(sb, USRQUOTA); 1496 else if (token == Opt_offgrpjquota) 1497 return clear_qf_name(sb, GRPQUOTA); 1498 #endif 1499 if (args->from && match_int(args, &arg)) 1500 return -1; 1501 switch (token) { 1502 case Opt_noacl: 1503 case Opt_nouser_xattr: 1504 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); 1505 break; 1506 case Opt_sb: 1507 return 1; /* handled by get_sb_block() */ 1508 case Opt_removed: 1509 ext4_msg(sb, KERN_WARNING, 1510 "Ignoring removed %s option", opt); 1511 return 1; 1512 case Opt_resuid: 1513 uid = make_kuid(current_user_ns(), arg); 1514 if (!uid_valid(uid)) { 1515 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); 1516 return -1; 1517 } 1518 sbi->s_resuid = uid; 1519 return 1; 1520 case Opt_resgid: 1521 gid = make_kgid(current_user_ns(), arg); 1522 if (!gid_valid(gid)) { 1523 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); 1524 return -1; 1525 } 1526 sbi->s_resgid = gid; 1527 return 1; 1528 case Opt_abort: 1529 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1530 return 1; 1531 case Opt_i_version: 1532 sb->s_flags |= MS_I_VERSION; 1533 return 1; 1534 case Opt_journal_dev: 1535 if (is_remount) { 1536 ext4_msg(sb, KERN_ERR, 1537 "Cannot specify journal on remount"); 1538 return -1; 1539 } 1540 *journal_devnum = arg; 1541 return 1; 1542 case Opt_journal_ioprio: 1543 if (arg < 0 || arg > 7) 1544 return -1; 1545 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); 1546 return 1; 1547 } 1548 1549 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 1550 if (token != m->token) 1551 continue; 1552 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) 1553 return -1; 1554 if (m->flags & MOPT_EXPLICIT) 1555 set_opt2(sb, EXPLICIT_DELALLOC); 1556 if (m->flags & MOPT_CLEAR_ERR) 1557 clear_opt(sb, ERRORS_MASK); 1558 if (token == Opt_noquota && sb_any_quota_loaded(sb)) { 1559 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1560 "options when quota turned on"); 1561 return -1; 1562 } 1563 1564 if (m->flags & MOPT_NOSUPPORT) { 1565 ext4_msg(sb, KERN_ERR, "%s option not supported", opt); 1566 } else if (token == Opt_commit) { 1567 if (arg == 0) 1568 arg = JBD2_DEFAULT_MAX_COMMIT_AGE; 1569 sbi->s_commit_interval = HZ * arg; 1570 } else if (token == Opt_max_batch_time) { 1571 if (arg == 0) 1572 arg = EXT4_DEF_MAX_BATCH_TIME; 1573 sbi->s_max_batch_time = arg; 1574 } else if (token == Opt_min_batch_time) { 1575 sbi->s_min_batch_time = arg; 1576 } else if (token == Opt_inode_readahead_blks) { 1577 if (arg > (1 << 30)) 1578 return -1; 1579 if (arg && !is_power_of_2(arg)) { 1580 ext4_msg(sb, KERN_ERR, 1581 "EXT4-fs: inode_readahead_blks" 1582 " must be a power of 2"); 1583 return -1; 1584 } 1585 sbi->s_inode_readahead_blks = arg; 1586 } else if (token == Opt_init_itable) { 1587 set_opt(sb, INIT_INODE_TABLE); 1588 if (!args->from) 1589 arg = EXT4_DEF_LI_WAIT_MULT; 1590 sbi->s_li_wait_mult = arg; 1591 } else if (token == Opt_max_dir_size_kb) { 1592 sbi->s_max_dir_size_kb = arg; 1593 } else if (token == Opt_stripe) { 1594 sbi->s_stripe = arg; 1595 } else if (m->flags & MOPT_DATAJ) { 1596 if (is_remount) { 1597 if (!sbi->s_journal) 1598 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); 1599 else if (test_opt(sb, DATA_FLAGS) != 1600 m->mount_opt) { 1601 ext4_msg(sb, KERN_ERR, 1602 "Cannot change data mode on remount"); 1603 return -1; 1604 } 1605 } else { 1606 clear_opt(sb, DATA_FLAGS); 1607 sbi->s_mount_opt |= m->mount_opt; 1608 } 1609 #ifdef CONFIG_QUOTA 1610 } else if (m->flags & MOPT_QFMT) { 1611 if (sb_any_quota_loaded(sb) && 1612 sbi->s_jquota_fmt != m->mount_opt) { 1613 ext4_msg(sb, KERN_ERR, "Cannot " 1614 "change journaled quota options " 1615 "when quota turned on"); 1616 return -1; 1617 } 1618 sbi->s_jquota_fmt = m->mount_opt; 1619 #endif 1620 } else { 1621 if (!args->from) 1622 arg = 1; 1623 if (m->flags & MOPT_CLEAR) 1624 arg = !arg; 1625 else if (unlikely(!(m->flags & MOPT_SET))) { 1626 ext4_msg(sb, KERN_WARNING, 1627 "buggy handling of option %s", opt); 1628 WARN_ON(1); 1629 return -1; 1630 } 1631 if (arg != 0) 1632 sbi->s_mount_opt |= m->mount_opt; 1633 else 1634 sbi->s_mount_opt &= ~m->mount_opt; 1635 } 1636 return 1; 1637 } 1638 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " 1639 "or missing value", opt); 1640 return -1; 1641 } 1642 1643 static int parse_options(char *options, struct super_block *sb, 1644 unsigned long *journal_devnum, 1645 unsigned int *journal_ioprio, 1646 int is_remount) 1647 { 1648 struct ext4_sb_info *sbi = EXT4_SB(sb); 1649 char *p; 1650 substring_t args[MAX_OPT_ARGS]; 1651 int token; 1652 1653 if (!options) 1654 return 1; 1655 1656 while ((p = strsep(&options, ",")) != NULL) { 1657 if (!*p) 1658 continue; 1659 /* 1660 * Initialize args struct so we know whether arg was 1661 * found; some options take optional arguments. 1662 */ 1663 args[0].to = args[0].from = NULL; 1664 token = match_token(p, tokens, args); 1665 if (handle_mount_opt(sb, p, token, args, journal_devnum, 1666 journal_ioprio, is_remount) < 0) 1667 return 0; 1668 } 1669 #ifdef CONFIG_QUOTA 1670 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1671 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1672 clear_opt(sb, USRQUOTA); 1673 1674 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1675 clear_opt(sb, GRPQUOTA); 1676 1677 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1678 ext4_msg(sb, KERN_ERR, "old and new quota " 1679 "format mixing"); 1680 return 0; 1681 } 1682 1683 if (!sbi->s_jquota_fmt) { 1684 ext4_msg(sb, KERN_ERR, "journaled quota format " 1685 "not specified"); 1686 return 0; 1687 } 1688 } else { 1689 if (sbi->s_jquota_fmt) { 1690 ext4_msg(sb, KERN_ERR, "journaled quota format " 1691 "specified with no journaling " 1692 "enabled"); 1693 return 0; 1694 } 1695 } 1696 #endif 1697 if (test_opt(sb, DIOREAD_NOLOCK)) { 1698 int blocksize = 1699 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 1700 1701 if (blocksize < PAGE_CACHE_SIZE) { 1702 ext4_msg(sb, KERN_ERR, "can't mount with " 1703 "dioread_nolock if block size != PAGE_SIZE"); 1704 return 0; 1705 } 1706 } 1707 return 1; 1708 } 1709 1710 static inline void ext4_show_quota_options(struct seq_file *seq, 1711 struct super_block *sb) 1712 { 1713 #if defined(CONFIG_QUOTA) 1714 struct ext4_sb_info *sbi = EXT4_SB(sb); 1715 1716 if (sbi->s_jquota_fmt) { 1717 char *fmtname = ""; 1718 1719 switch (sbi->s_jquota_fmt) { 1720 case QFMT_VFS_OLD: 1721 fmtname = "vfsold"; 1722 break; 1723 case QFMT_VFS_V0: 1724 fmtname = "vfsv0"; 1725 break; 1726 case QFMT_VFS_V1: 1727 fmtname = "vfsv1"; 1728 break; 1729 } 1730 seq_printf(seq, ",jqfmt=%s", fmtname); 1731 } 1732 1733 if (sbi->s_qf_names[USRQUOTA]) 1734 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 1735 1736 if (sbi->s_qf_names[GRPQUOTA]) 1737 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 1738 1739 if (test_opt(sb, USRQUOTA)) 1740 seq_puts(seq, ",usrquota"); 1741 1742 if (test_opt(sb, GRPQUOTA)) 1743 seq_puts(seq, ",grpquota"); 1744 #endif 1745 } 1746 1747 static const char *token2str(int token) 1748 { 1749 const struct match_token *t; 1750 1751 for (t = tokens; t->token != Opt_err; t++) 1752 if (t->token == token && !strchr(t->pattern, '=')) 1753 break; 1754 return t->pattern; 1755 } 1756 1757 /* 1758 * Show an option if 1759 * - it's set to a non-default value OR 1760 * - if the per-sb default is different from the global default 1761 */ 1762 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, 1763 int nodefs) 1764 { 1765 struct ext4_sb_info *sbi = EXT4_SB(sb); 1766 struct ext4_super_block *es = sbi->s_es; 1767 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; 1768 const struct mount_opts *m; 1769 char sep = nodefs ? '\n' : ','; 1770 1771 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) 1772 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) 1773 1774 if (sbi->s_sb_block != 1) 1775 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); 1776 1777 for (m = ext4_mount_opts; m->token != Opt_err; m++) { 1778 int want_set = m->flags & MOPT_SET; 1779 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || 1780 (m->flags & MOPT_CLEAR_ERR)) 1781 continue; 1782 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) 1783 continue; /* skip if same as the default */ 1784 if ((want_set && 1785 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || 1786 (!want_set && (sbi->s_mount_opt & m->mount_opt))) 1787 continue; /* select Opt_noFoo vs Opt_Foo */ 1788 SEQ_OPTS_PRINT("%s", token2str(m->token)); 1789 } 1790 1791 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || 1792 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) 1793 SEQ_OPTS_PRINT("resuid=%u", 1794 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 1795 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || 1796 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) 1797 SEQ_OPTS_PRINT("resgid=%u", 1798 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 1799 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); 1800 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) 1801 SEQ_OPTS_PUTS("errors=remount-ro"); 1802 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 1803 SEQ_OPTS_PUTS("errors=continue"); 1804 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 1805 SEQ_OPTS_PUTS("errors=panic"); 1806 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) 1807 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); 1808 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) 1809 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); 1810 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) 1811 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); 1812 if (sb->s_flags & MS_I_VERSION) 1813 SEQ_OPTS_PUTS("i_version"); 1814 if (nodefs || sbi->s_stripe) 1815 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); 1816 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { 1817 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1818 SEQ_OPTS_PUTS("data=journal"); 1819 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1820 SEQ_OPTS_PUTS("data=ordered"); 1821 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1822 SEQ_OPTS_PUTS("data=writeback"); 1823 } 1824 if (nodefs || 1825 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1826 SEQ_OPTS_PRINT("inode_readahead_blks=%u", 1827 sbi->s_inode_readahead_blks); 1828 1829 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && 1830 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) 1831 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); 1832 if (nodefs || sbi->s_max_dir_size_kb) 1833 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); 1834 1835 ext4_show_quota_options(seq, sb); 1836 return 0; 1837 } 1838 1839 static int ext4_show_options(struct seq_file *seq, struct dentry *root) 1840 { 1841 return _ext4_show_options(seq, root->d_sb, 0); 1842 } 1843 1844 static int options_seq_show(struct seq_file *seq, void *offset) 1845 { 1846 struct super_block *sb = seq->private; 1847 int rc; 1848 1849 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); 1850 rc = _ext4_show_options(seq, sb, 1); 1851 seq_puts(seq, "\n"); 1852 return rc; 1853 } 1854 1855 static int options_open_fs(struct inode *inode, struct file *file) 1856 { 1857 return single_open(file, options_seq_show, PDE(inode)->data); 1858 } 1859 1860 static const struct file_operations ext4_seq_options_fops = { 1861 .owner = THIS_MODULE, 1862 .open = options_open_fs, 1863 .read = seq_read, 1864 .llseek = seq_lseek, 1865 .release = single_release, 1866 }; 1867 1868 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1869 int read_only) 1870 { 1871 struct ext4_sb_info *sbi = EXT4_SB(sb); 1872 int res = 0; 1873 1874 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1875 ext4_msg(sb, KERN_ERR, "revision level too high, " 1876 "forcing read-only mode"); 1877 res = MS_RDONLY; 1878 } 1879 if (read_only) 1880 goto done; 1881 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1882 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1883 "running e2fsck is recommended"); 1884 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1885 ext4_msg(sb, KERN_WARNING, 1886 "warning: mounting fs with errors, " 1887 "running e2fsck is recommended"); 1888 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 1889 le16_to_cpu(es->s_mnt_count) >= 1890 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1891 ext4_msg(sb, KERN_WARNING, 1892 "warning: maximal mount count reached, " 1893 "running e2fsck is recommended"); 1894 else if (le32_to_cpu(es->s_checkinterval) && 1895 (le32_to_cpu(es->s_lastcheck) + 1896 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1897 ext4_msg(sb, KERN_WARNING, 1898 "warning: checktime reached, " 1899 "running e2fsck is recommended"); 1900 if (!sbi->s_journal) 1901 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1902 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1903 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1904 le16_add_cpu(&es->s_mnt_count, 1); 1905 es->s_mtime = cpu_to_le32(get_seconds()); 1906 ext4_update_dynamic_rev(sb); 1907 if (sbi->s_journal) 1908 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1909 1910 ext4_commit_super(sb, 1); 1911 done: 1912 if (test_opt(sb, DEBUG)) 1913 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1914 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 1915 sb->s_blocksize, 1916 sbi->s_groups_count, 1917 EXT4_BLOCKS_PER_GROUP(sb), 1918 EXT4_INODES_PER_GROUP(sb), 1919 sbi->s_mount_opt, sbi->s_mount_opt2); 1920 1921 cleancache_init_fs(sb); 1922 return res; 1923 } 1924 1925 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) 1926 { 1927 struct ext4_sb_info *sbi = EXT4_SB(sb); 1928 struct flex_groups *new_groups; 1929 int size; 1930 1931 if (!sbi->s_log_groups_per_flex) 1932 return 0; 1933 1934 size = ext4_flex_group(sbi, ngroup - 1) + 1; 1935 if (size <= sbi->s_flex_groups_allocated) 1936 return 0; 1937 1938 size = roundup_pow_of_two(size * sizeof(struct flex_groups)); 1939 new_groups = ext4_kvzalloc(size, GFP_KERNEL); 1940 if (!new_groups) { 1941 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", 1942 size / (int) sizeof(struct flex_groups)); 1943 return -ENOMEM; 1944 } 1945 1946 if (sbi->s_flex_groups) { 1947 memcpy(new_groups, sbi->s_flex_groups, 1948 (sbi->s_flex_groups_allocated * 1949 sizeof(struct flex_groups))); 1950 ext4_kvfree(sbi->s_flex_groups); 1951 } 1952 sbi->s_flex_groups = new_groups; 1953 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); 1954 return 0; 1955 } 1956 1957 static int ext4_fill_flex_info(struct super_block *sb) 1958 { 1959 struct ext4_sb_info *sbi = EXT4_SB(sb); 1960 struct ext4_group_desc *gdp = NULL; 1961 ext4_group_t flex_group; 1962 unsigned int groups_per_flex = 0; 1963 int i, err; 1964 1965 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1966 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 1967 sbi->s_log_groups_per_flex = 0; 1968 return 1; 1969 } 1970 groups_per_flex = 1U << sbi->s_log_groups_per_flex; 1971 1972 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); 1973 if (err) 1974 goto failed; 1975 1976 for (i = 0; i < sbi->s_groups_count; i++) { 1977 gdp = ext4_get_group_desc(sb, i, NULL); 1978 1979 flex_group = ext4_flex_group(sbi, i); 1980 atomic_add(ext4_free_inodes_count(sb, gdp), 1981 &sbi->s_flex_groups[flex_group].free_inodes); 1982 atomic_add(ext4_free_group_clusters(sb, gdp), 1983 &sbi->s_flex_groups[flex_group].free_clusters); 1984 atomic_add(ext4_used_dirs_count(sb, gdp), 1985 &sbi->s_flex_groups[flex_group].used_dirs); 1986 } 1987 1988 return 1; 1989 failed: 1990 return 0; 1991 } 1992 1993 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1994 struct ext4_group_desc *gdp) 1995 { 1996 int offset; 1997 __u16 crc = 0; 1998 __le32 le_group = cpu_to_le32(block_group); 1999 2000 if ((sbi->s_es->s_feature_ro_compat & 2001 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) { 2002 /* Use new metadata_csum algorithm */ 2003 __u16 old_csum; 2004 __u32 csum32; 2005 2006 old_csum = gdp->bg_checksum; 2007 gdp->bg_checksum = 0; 2008 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, 2009 sizeof(le_group)); 2010 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, 2011 sbi->s_desc_size); 2012 gdp->bg_checksum = old_csum; 2013 2014 crc = csum32 & 0xFFFF; 2015 goto out; 2016 } 2017 2018 /* old crc16 code */ 2019 offset = offsetof(struct ext4_group_desc, bg_checksum); 2020 2021 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 2022 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 2023 crc = crc16(crc, (__u8 *)gdp, offset); 2024 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 2025 /* for checksum of struct ext4_group_desc do the rest...*/ 2026 if ((sbi->s_es->s_feature_incompat & 2027 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 2028 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 2029 crc = crc16(crc, (__u8 *)gdp + offset, 2030 le16_to_cpu(sbi->s_es->s_desc_size) - 2031 offset); 2032 2033 out: 2034 return cpu_to_le16(crc); 2035 } 2036 2037 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, 2038 struct ext4_group_desc *gdp) 2039 { 2040 if (ext4_has_group_desc_csum(sb) && 2041 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb), 2042 block_group, gdp))) 2043 return 0; 2044 2045 return 1; 2046 } 2047 2048 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, 2049 struct ext4_group_desc *gdp) 2050 { 2051 if (!ext4_has_group_desc_csum(sb)) 2052 return; 2053 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp); 2054 } 2055 2056 /* Called at mount-time, super-block is locked */ 2057 static int ext4_check_descriptors(struct super_block *sb, 2058 ext4_group_t *first_not_zeroed) 2059 { 2060 struct ext4_sb_info *sbi = EXT4_SB(sb); 2061 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 2062 ext4_fsblk_t last_block; 2063 ext4_fsblk_t block_bitmap; 2064 ext4_fsblk_t inode_bitmap; 2065 ext4_fsblk_t inode_table; 2066 int flexbg_flag = 0; 2067 ext4_group_t i, grp = sbi->s_groups_count; 2068 2069 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2070 flexbg_flag = 1; 2071 2072 ext4_debug("Checking group descriptors"); 2073 2074 for (i = 0; i < sbi->s_groups_count; i++) { 2075 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2076 2077 if (i == sbi->s_groups_count - 1 || flexbg_flag) 2078 last_block = ext4_blocks_count(sbi->s_es) - 1; 2079 else 2080 last_block = first_block + 2081 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2082 2083 if ((grp == sbi->s_groups_count) && 2084 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2085 grp = i; 2086 2087 block_bitmap = ext4_block_bitmap(sb, gdp); 2088 if (block_bitmap < first_block || block_bitmap > last_block) { 2089 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2090 "Block bitmap for group %u not in group " 2091 "(block %llu)!", i, block_bitmap); 2092 return 0; 2093 } 2094 inode_bitmap = ext4_inode_bitmap(sb, gdp); 2095 if (inode_bitmap < first_block || inode_bitmap > last_block) { 2096 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2097 "Inode bitmap for group %u not in group " 2098 "(block %llu)!", i, inode_bitmap); 2099 return 0; 2100 } 2101 inode_table = ext4_inode_table(sb, gdp); 2102 if (inode_table < first_block || 2103 inode_table + sbi->s_itb_per_group - 1 > last_block) { 2104 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2105 "Inode table for group %u not in group " 2106 "(block %llu)!", i, inode_table); 2107 return 0; 2108 } 2109 ext4_lock_group(sb, i); 2110 if (!ext4_group_desc_csum_verify(sb, i, gdp)) { 2111 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2112 "Checksum for group %u failed (%u!=%u)", 2113 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 2114 gdp)), le16_to_cpu(gdp->bg_checksum)); 2115 if (!(sb->s_flags & MS_RDONLY)) { 2116 ext4_unlock_group(sb, i); 2117 return 0; 2118 } 2119 } 2120 ext4_unlock_group(sb, i); 2121 if (!flexbg_flag) 2122 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2123 } 2124 if (NULL != first_not_zeroed) 2125 *first_not_zeroed = grp; 2126 2127 ext4_free_blocks_count_set(sbi->s_es, 2128 EXT4_C2B(sbi, ext4_count_free_clusters(sb))); 2129 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 2130 return 1; 2131 } 2132 2133 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2134 * the superblock) which were deleted from all directories, but held open by 2135 * a process at the time of a crash. We walk the list and try to delete these 2136 * inodes at recovery time (only with a read-write filesystem). 2137 * 2138 * In order to keep the orphan inode chain consistent during traversal (in 2139 * case of crash during recovery), we link each inode into the superblock 2140 * orphan list_head and handle it the same way as an inode deletion during 2141 * normal operation (which journals the operations for us). 2142 * 2143 * We only do an iget() and an iput() on each inode, which is very safe if we 2144 * accidentally point at an in-use or already deleted inode. The worst that 2145 * can happen in this case is that we get a "bit already cleared" message from 2146 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2147 * e2fsck was run on this filesystem, and it must have already done the orphan 2148 * inode cleanup for us, so we can safely abort without any further action. 2149 */ 2150 static void ext4_orphan_cleanup(struct super_block *sb, 2151 struct ext4_super_block *es) 2152 { 2153 unsigned int s_flags = sb->s_flags; 2154 int nr_orphans = 0, nr_truncates = 0; 2155 #ifdef CONFIG_QUOTA 2156 int i; 2157 #endif 2158 if (!es->s_last_orphan) { 2159 jbd_debug(4, "no orphan inodes to clean up\n"); 2160 return; 2161 } 2162 2163 if (bdev_read_only(sb->s_bdev)) { 2164 ext4_msg(sb, KERN_ERR, "write access " 2165 "unavailable, skipping orphan cleanup"); 2166 return; 2167 } 2168 2169 /* Check if feature set would not allow a r/w mount */ 2170 if (!ext4_feature_set_ok(sb, 0)) { 2171 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2172 "unknown ROCOMPAT features"); 2173 return; 2174 } 2175 2176 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2177 /* don't clear list on RO mount w/ errors */ 2178 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { 2179 jbd_debug(1, "Errors on filesystem, " 2180 "clearing orphan list.\n"); 2181 es->s_last_orphan = 0; 2182 } 2183 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2184 return; 2185 } 2186 2187 if (s_flags & MS_RDONLY) { 2188 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2189 sb->s_flags &= ~MS_RDONLY; 2190 } 2191 #ifdef CONFIG_QUOTA 2192 /* Needed for iput() to work correctly and not trash data */ 2193 sb->s_flags |= MS_ACTIVE; 2194 /* Turn on quotas so that they are updated correctly */ 2195 for (i = 0; i < MAXQUOTAS; i++) { 2196 if (EXT4_SB(sb)->s_qf_names[i]) { 2197 int ret = ext4_quota_on_mount(sb, i); 2198 if (ret < 0) 2199 ext4_msg(sb, KERN_ERR, 2200 "Cannot turn on journaled " 2201 "quota: error %d", ret); 2202 } 2203 } 2204 #endif 2205 2206 while (es->s_last_orphan) { 2207 struct inode *inode; 2208 2209 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2210 if (IS_ERR(inode)) { 2211 es->s_last_orphan = 0; 2212 break; 2213 } 2214 2215 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2216 dquot_initialize(inode); 2217 if (inode->i_nlink) { 2218 ext4_msg(sb, KERN_DEBUG, 2219 "%s: truncating inode %lu to %lld bytes", 2220 __func__, inode->i_ino, inode->i_size); 2221 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2222 inode->i_ino, inode->i_size); 2223 mutex_lock(&inode->i_mutex); 2224 ext4_truncate(inode); 2225 mutex_unlock(&inode->i_mutex); 2226 nr_truncates++; 2227 } else { 2228 ext4_msg(sb, KERN_DEBUG, 2229 "%s: deleting unreferenced inode %lu", 2230 __func__, inode->i_ino); 2231 jbd_debug(2, "deleting unreferenced inode %lu\n", 2232 inode->i_ino); 2233 nr_orphans++; 2234 } 2235 iput(inode); /* The delete magic happens here! */ 2236 } 2237 2238 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2239 2240 if (nr_orphans) 2241 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2242 PLURAL(nr_orphans)); 2243 if (nr_truncates) 2244 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2245 PLURAL(nr_truncates)); 2246 #ifdef CONFIG_QUOTA 2247 /* Turn quotas off */ 2248 for (i = 0; i < MAXQUOTAS; i++) { 2249 if (sb_dqopt(sb)->files[i]) 2250 dquot_quota_off(sb, i); 2251 } 2252 #endif 2253 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2254 } 2255 2256 /* 2257 * Maximal extent format file size. 2258 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2259 * extent format containers, within a sector_t, and within i_blocks 2260 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2261 * so that won't be a limiting factor. 2262 * 2263 * However there is other limiting factor. We do store extents in the form 2264 * of starting block and length, hence the resulting length of the extent 2265 * covering maximum file size must fit into on-disk format containers as 2266 * well. Given that length is always by 1 unit bigger than max unit (because 2267 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2268 * 2269 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2270 */ 2271 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2272 { 2273 loff_t res; 2274 loff_t upper_limit = MAX_LFS_FILESIZE; 2275 2276 /* small i_blocks in vfs inode? */ 2277 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2278 /* 2279 * CONFIG_LBDAF is not enabled implies the inode 2280 * i_block represent total blocks in 512 bytes 2281 * 32 == size of vfs inode i_blocks * 8 2282 */ 2283 upper_limit = (1LL << 32) - 1; 2284 2285 /* total blocks in file system block size */ 2286 upper_limit >>= (blkbits - 9); 2287 upper_limit <<= blkbits; 2288 } 2289 2290 /* 2291 * 32-bit extent-start container, ee_block. We lower the maxbytes 2292 * by one fs block, so ee_len can cover the extent of maximum file 2293 * size 2294 */ 2295 res = (1LL << 32) - 1; 2296 res <<= blkbits; 2297 2298 /* Sanity check against vm- & vfs- imposed limits */ 2299 if (res > upper_limit) 2300 res = upper_limit; 2301 2302 return res; 2303 } 2304 2305 /* 2306 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2307 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2308 * We need to be 1 filesystem block less than the 2^48 sector limit. 2309 */ 2310 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2311 { 2312 loff_t res = EXT4_NDIR_BLOCKS; 2313 int meta_blocks; 2314 loff_t upper_limit; 2315 /* This is calculated to be the largest file size for a dense, block 2316 * mapped file such that the file's total number of 512-byte sectors, 2317 * including data and all indirect blocks, does not exceed (2^48 - 1). 2318 * 2319 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2320 * number of 512-byte sectors of the file. 2321 */ 2322 2323 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2324 /* 2325 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2326 * the inode i_block field represents total file blocks in 2327 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2328 */ 2329 upper_limit = (1LL << 32) - 1; 2330 2331 /* total blocks in file system block size */ 2332 upper_limit >>= (bits - 9); 2333 2334 } else { 2335 /* 2336 * We use 48 bit ext4_inode i_blocks 2337 * With EXT4_HUGE_FILE_FL set the i_blocks 2338 * represent total number of blocks in 2339 * file system block size 2340 */ 2341 upper_limit = (1LL << 48) - 1; 2342 2343 } 2344 2345 /* indirect blocks */ 2346 meta_blocks = 1; 2347 /* double indirect blocks */ 2348 meta_blocks += 1 + (1LL << (bits-2)); 2349 /* tripple indirect blocks */ 2350 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2351 2352 upper_limit -= meta_blocks; 2353 upper_limit <<= bits; 2354 2355 res += 1LL << (bits-2); 2356 res += 1LL << (2*(bits-2)); 2357 res += 1LL << (3*(bits-2)); 2358 res <<= bits; 2359 if (res > upper_limit) 2360 res = upper_limit; 2361 2362 if (res > MAX_LFS_FILESIZE) 2363 res = MAX_LFS_FILESIZE; 2364 2365 return res; 2366 } 2367 2368 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2369 ext4_fsblk_t logical_sb_block, int nr) 2370 { 2371 struct ext4_sb_info *sbi = EXT4_SB(sb); 2372 ext4_group_t bg, first_meta_bg; 2373 int has_super = 0; 2374 2375 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2376 2377 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2378 nr < first_meta_bg) 2379 return logical_sb_block + nr + 1; 2380 bg = sbi->s_desc_per_block * nr; 2381 if (ext4_bg_has_super(sb, bg)) 2382 has_super = 1; 2383 2384 return (has_super + ext4_group_first_block_no(sb, bg)); 2385 } 2386 2387 /** 2388 * ext4_get_stripe_size: Get the stripe size. 2389 * @sbi: In memory super block info 2390 * 2391 * If we have specified it via mount option, then 2392 * use the mount option value. If the value specified at mount time is 2393 * greater than the blocks per group use the super block value. 2394 * If the super block value is greater than blocks per group return 0. 2395 * Allocator needs it be less than blocks per group. 2396 * 2397 */ 2398 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2399 { 2400 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2401 unsigned long stripe_width = 2402 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2403 int ret; 2404 2405 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2406 ret = sbi->s_stripe; 2407 else if (stripe_width <= sbi->s_blocks_per_group) 2408 ret = stripe_width; 2409 else if (stride <= sbi->s_blocks_per_group) 2410 ret = stride; 2411 else 2412 ret = 0; 2413 2414 /* 2415 * If the stripe width is 1, this makes no sense and 2416 * we set it to 0 to turn off stripe handling code. 2417 */ 2418 if (ret <= 1) 2419 ret = 0; 2420 2421 return ret; 2422 } 2423 2424 /* sysfs supprt */ 2425 2426 struct ext4_attr { 2427 struct attribute attr; 2428 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 2429 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 2430 const char *, size_t); 2431 int offset; 2432 }; 2433 2434 static int parse_strtoul(const char *buf, 2435 unsigned long max, unsigned long *value) 2436 { 2437 char *endp; 2438 2439 *value = simple_strtoul(skip_spaces(buf), &endp, 0); 2440 endp = skip_spaces(endp); 2441 if (*endp || *value > max) 2442 return -EINVAL; 2443 2444 return 0; 2445 } 2446 2447 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 2448 struct ext4_sb_info *sbi, 2449 char *buf) 2450 { 2451 return snprintf(buf, PAGE_SIZE, "%llu\n", 2452 (s64) EXT4_C2B(sbi, 2453 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 2454 } 2455 2456 static ssize_t session_write_kbytes_show(struct ext4_attr *a, 2457 struct ext4_sb_info *sbi, char *buf) 2458 { 2459 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2460 2461 if (!sb->s_bdev->bd_part) 2462 return snprintf(buf, PAGE_SIZE, "0\n"); 2463 return snprintf(buf, PAGE_SIZE, "%lu\n", 2464 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2465 sbi->s_sectors_written_start) >> 1); 2466 } 2467 2468 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 2469 struct ext4_sb_info *sbi, char *buf) 2470 { 2471 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2472 2473 if (!sb->s_bdev->bd_part) 2474 return snprintf(buf, PAGE_SIZE, "0\n"); 2475 return snprintf(buf, PAGE_SIZE, "%llu\n", 2476 (unsigned long long)(sbi->s_kbytes_written + 2477 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2478 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 2479 } 2480 2481 static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 2482 struct ext4_sb_info *sbi, 2483 const char *buf, size_t count) 2484 { 2485 unsigned long t; 2486 2487 if (parse_strtoul(buf, 0x40000000, &t)) 2488 return -EINVAL; 2489 2490 if (t && !is_power_of_2(t)) 2491 return -EINVAL; 2492 2493 sbi->s_inode_readahead_blks = t; 2494 return count; 2495 } 2496 2497 static ssize_t sbi_ui_show(struct ext4_attr *a, 2498 struct ext4_sb_info *sbi, char *buf) 2499 { 2500 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2501 2502 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 2503 } 2504 2505 static ssize_t sbi_ui_store(struct ext4_attr *a, 2506 struct ext4_sb_info *sbi, 2507 const char *buf, size_t count) 2508 { 2509 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2510 unsigned long t; 2511 2512 if (parse_strtoul(buf, 0xffffffff, &t)) 2513 return -EINVAL; 2514 *ui = t; 2515 return count; 2516 } 2517 2518 static ssize_t trigger_test_error(struct ext4_attr *a, 2519 struct ext4_sb_info *sbi, 2520 const char *buf, size_t count) 2521 { 2522 int len = count; 2523 2524 if (!capable(CAP_SYS_ADMIN)) 2525 return -EPERM; 2526 2527 if (len && buf[len-1] == '\n') 2528 len--; 2529 2530 if (len) 2531 ext4_error(sbi->s_sb, "%.*s", len, buf); 2532 return count; 2533 } 2534 2535 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 2536 static struct ext4_attr ext4_attr_##_name = { \ 2537 .attr = {.name = __stringify(_name), .mode = _mode }, \ 2538 .show = _show, \ 2539 .store = _store, \ 2540 .offset = offsetof(struct ext4_sb_info, _elname), \ 2541 } 2542 #define EXT4_ATTR(name, mode, show, store) \ 2543 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 2544 2545 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) 2546 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 2547 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 2548 #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 2549 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 2550 #define ATTR_LIST(name) &ext4_attr_##name.attr 2551 2552 EXT4_RO_ATTR(delayed_allocation_blocks); 2553 EXT4_RO_ATTR(session_write_kbytes); 2554 EXT4_RO_ATTR(lifetime_write_kbytes); 2555 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 2556 inode_readahead_blks_store, s_inode_readahead_blks); 2557 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 2558 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 2559 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 2560 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 2561 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 2562 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 2563 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 2564 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); 2565 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); 2566 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error); 2567 2568 static struct attribute *ext4_attrs[] = { 2569 ATTR_LIST(delayed_allocation_blocks), 2570 ATTR_LIST(session_write_kbytes), 2571 ATTR_LIST(lifetime_write_kbytes), 2572 ATTR_LIST(inode_readahead_blks), 2573 ATTR_LIST(inode_goal), 2574 ATTR_LIST(mb_stats), 2575 ATTR_LIST(mb_max_to_scan), 2576 ATTR_LIST(mb_min_to_scan), 2577 ATTR_LIST(mb_order2_req), 2578 ATTR_LIST(mb_stream_req), 2579 ATTR_LIST(mb_group_prealloc), 2580 ATTR_LIST(max_writeback_mb_bump), 2581 ATTR_LIST(extent_max_zeroout_kb), 2582 ATTR_LIST(trigger_fs_error), 2583 NULL, 2584 }; 2585 2586 /* Features this copy of ext4 supports */ 2587 EXT4_INFO_ATTR(lazy_itable_init); 2588 EXT4_INFO_ATTR(batched_discard); 2589 EXT4_INFO_ATTR(meta_bg_resize); 2590 2591 static struct attribute *ext4_feat_attrs[] = { 2592 ATTR_LIST(lazy_itable_init), 2593 ATTR_LIST(batched_discard), 2594 ATTR_LIST(meta_bg_resize), 2595 NULL, 2596 }; 2597 2598 static ssize_t ext4_attr_show(struct kobject *kobj, 2599 struct attribute *attr, char *buf) 2600 { 2601 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2602 s_kobj); 2603 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2604 2605 return a->show ? a->show(a, sbi, buf) : 0; 2606 } 2607 2608 static ssize_t ext4_attr_store(struct kobject *kobj, 2609 struct attribute *attr, 2610 const char *buf, size_t len) 2611 { 2612 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2613 s_kobj); 2614 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2615 2616 return a->store ? a->store(a, sbi, buf, len) : 0; 2617 } 2618 2619 static void ext4_sb_release(struct kobject *kobj) 2620 { 2621 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2622 s_kobj); 2623 complete(&sbi->s_kobj_unregister); 2624 } 2625 2626 static const struct sysfs_ops ext4_attr_ops = { 2627 .show = ext4_attr_show, 2628 .store = ext4_attr_store, 2629 }; 2630 2631 static struct kobj_type ext4_ktype = { 2632 .default_attrs = ext4_attrs, 2633 .sysfs_ops = &ext4_attr_ops, 2634 .release = ext4_sb_release, 2635 }; 2636 2637 static void ext4_feat_release(struct kobject *kobj) 2638 { 2639 complete(&ext4_feat->f_kobj_unregister); 2640 } 2641 2642 static struct kobj_type ext4_feat_ktype = { 2643 .default_attrs = ext4_feat_attrs, 2644 .sysfs_ops = &ext4_attr_ops, 2645 .release = ext4_feat_release, 2646 }; 2647 2648 /* 2649 * Check whether this filesystem can be mounted based on 2650 * the features present and the RDONLY/RDWR mount requested. 2651 * Returns 1 if this filesystem can be mounted as requested, 2652 * 0 if it cannot be. 2653 */ 2654 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2655 { 2656 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2657 ext4_msg(sb, KERN_ERR, 2658 "Couldn't mount because of " 2659 "unsupported optional features (%x)", 2660 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2661 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2662 return 0; 2663 } 2664 2665 if (readonly) 2666 return 1; 2667 2668 /* Check that feature set is OK for a read-write mount */ 2669 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2670 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2671 "unsupported optional features (%x)", 2672 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2673 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2674 return 0; 2675 } 2676 /* 2677 * Large file size enabled file system can only be mounted 2678 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2679 */ 2680 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2681 if (sizeof(blkcnt_t) < sizeof(u64)) { 2682 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2683 "cannot be mounted RDWR without " 2684 "CONFIG_LBDAF"); 2685 return 0; 2686 } 2687 } 2688 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) && 2689 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 2690 ext4_msg(sb, KERN_ERR, 2691 "Can't support bigalloc feature without " 2692 "extents feature\n"); 2693 return 0; 2694 } 2695 2696 #ifndef CONFIG_QUOTA 2697 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && 2698 !readonly) { 2699 ext4_msg(sb, KERN_ERR, 2700 "Filesystem with quota feature cannot be mounted RDWR " 2701 "without CONFIG_QUOTA"); 2702 return 0; 2703 } 2704 #endif /* CONFIG_QUOTA */ 2705 return 1; 2706 } 2707 2708 /* 2709 * This function is called once a day if we have errors logged 2710 * on the file system 2711 */ 2712 static void print_daily_error_info(unsigned long arg) 2713 { 2714 struct super_block *sb = (struct super_block *) arg; 2715 struct ext4_sb_info *sbi; 2716 struct ext4_super_block *es; 2717 2718 sbi = EXT4_SB(sb); 2719 es = sbi->s_es; 2720 2721 if (es->s_error_count) 2722 ext4_msg(sb, KERN_NOTICE, "error count: %u", 2723 le32_to_cpu(es->s_error_count)); 2724 if (es->s_first_error_time) { 2725 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", 2726 sb->s_id, le32_to_cpu(es->s_first_error_time), 2727 (int) sizeof(es->s_first_error_func), 2728 es->s_first_error_func, 2729 le32_to_cpu(es->s_first_error_line)); 2730 if (es->s_first_error_ino) 2731 printk(": inode %u", 2732 le32_to_cpu(es->s_first_error_ino)); 2733 if (es->s_first_error_block) 2734 printk(": block %llu", (unsigned long long) 2735 le64_to_cpu(es->s_first_error_block)); 2736 printk("\n"); 2737 } 2738 if (es->s_last_error_time) { 2739 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", 2740 sb->s_id, le32_to_cpu(es->s_last_error_time), 2741 (int) sizeof(es->s_last_error_func), 2742 es->s_last_error_func, 2743 le32_to_cpu(es->s_last_error_line)); 2744 if (es->s_last_error_ino) 2745 printk(": inode %u", 2746 le32_to_cpu(es->s_last_error_ino)); 2747 if (es->s_last_error_block) 2748 printk(": block %llu", (unsigned long long) 2749 le64_to_cpu(es->s_last_error_block)); 2750 printk("\n"); 2751 } 2752 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2753 } 2754 2755 /* Find next suitable group and run ext4_init_inode_table */ 2756 static int ext4_run_li_request(struct ext4_li_request *elr) 2757 { 2758 struct ext4_group_desc *gdp = NULL; 2759 ext4_group_t group, ngroups; 2760 struct super_block *sb; 2761 unsigned long timeout = 0; 2762 int ret = 0; 2763 2764 sb = elr->lr_super; 2765 ngroups = EXT4_SB(sb)->s_groups_count; 2766 2767 sb_start_write(sb); 2768 for (group = elr->lr_next_group; group < ngroups; group++) { 2769 gdp = ext4_get_group_desc(sb, group, NULL); 2770 if (!gdp) { 2771 ret = 1; 2772 break; 2773 } 2774 2775 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2776 break; 2777 } 2778 2779 if (group == ngroups) 2780 ret = 1; 2781 2782 if (!ret) { 2783 timeout = jiffies; 2784 ret = ext4_init_inode_table(sb, group, 2785 elr->lr_timeout ? 0 : 1); 2786 if (elr->lr_timeout == 0) { 2787 timeout = (jiffies - timeout) * 2788 elr->lr_sbi->s_li_wait_mult; 2789 elr->lr_timeout = timeout; 2790 } 2791 elr->lr_next_sched = jiffies + elr->lr_timeout; 2792 elr->lr_next_group = group + 1; 2793 } 2794 sb_end_write(sb); 2795 2796 return ret; 2797 } 2798 2799 /* 2800 * Remove lr_request from the list_request and free the 2801 * request structure. Should be called with li_list_mtx held 2802 */ 2803 static void ext4_remove_li_request(struct ext4_li_request *elr) 2804 { 2805 struct ext4_sb_info *sbi; 2806 2807 if (!elr) 2808 return; 2809 2810 sbi = elr->lr_sbi; 2811 2812 list_del(&elr->lr_request); 2813 sbi->s_li_request = NULL; 2814 kfree(elr); 2815 } 2816 2817 static void ext4_unregister_li_request(struct super_block *sb) 2818 { 2819 mutex_lock(&ext4_li_mtx); 2820 if (!ext4_li_info) { 2821 mutex_unlock(&ext4_li_mtx); 2822 return; 2823 } 2824 2825 mutex_lock(&ext4_li_info->li_list_mtx); 2826 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2827 mutex_unlock(&ext4_li_info->li_list_mtx); 2828 mutex_unlock(&ext4_li_mtx); 2829 } 2830 2831 static struct task_struct *ext4_lazyinit_task; 2832 2833 /* 2834 * This is the function where ext4lazyinit thread lives. It walks 2835 * through the request list searching for next scheduled filesystem. 2836 * When such a fs is found, run the lazy initialization request 2837 * (ext4_rn_li_request) and keep track of the time spend in this 2838 * function. Based on that time we compute next schedule time of 2839 * the request. When walking through the list is complete, compute 2840 * next waking time and put itself into sleep. 2841 */ 2842 static int ext4_lazyinit_thread(void *arg) 2843 { 2844 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2845 struct list_head *pos, *n; 2846 struct ext4_li_request *elr; 2847 unsigned long next_wakeup, cur; 2848 2849 BUG_ON(NULL == eli); 2850 2851 cont_thread: 2852 while (true) { 2853 next_wakeup = MAX_JIFFY_OFFSET; 2854 2855 mutex_lock(&eli->li_list_mtx); 2856 if (list_empty(&eli->li_request_list)) { 2857 mutex_unlock(&eli->li_list_mtx); 2858 goto exit_thread; 2859 } 2860 2861 list_for_each_safe(pos, n, &eli->li_request_list) { 2862 elr = list_entry(pos, struct ext4_li_request, 2863 lr_request); 2864 2865 if (time_after_eq(jiffies, elr->lr_next_sched)) { 2866 if (ext4_run_li_request(elr) != 0) { 2867 /* error, remove the lazy_init job */ 2868 ext4_remove_li_request(elr); 2869 continue; 2870 } 2871 } 2872 2873 if (time_before(elr->lr_next_sched, next_wakeup)) 2874 next_wakeup = elr->lr_next_sched; 2875 } 2876 mutex_unlock(&eli->li_list_mtx); 2877 2878 try_to_freeze(); 2879 2880 cur = jiffies; 2881 if ((time_after_eq(cur, next_wakeup)) || 2882 (MAX_JIFFY_OFFSET == next_wakeup)) { 2883 cond_resched(); 2884 continue; 2885 } 2886 2887 schedule_timeout_interruptible(next_wakeup - cur); 2888 2889 if (kthread_should_stop()) { 2890 ext4_clear_request_list(); 2891 goto exit_thread; 2892 } 2893 } 2894 2895 exit_thread: 2896 /* 2897 * It looks like the request list is empty, but we need 2898 * to check it under the li_list_mtx lock, to prevent any 2899 * additions into it, and of course we should lock ext4_li_mtx 2900 * to atomically free the list and ext4_li_info, because at 2901 * this point another ext4 filesystem could be registering 2902 * new one. 2903 */ 2904 mutex_lock(&ext4_li_mtx); 2905 mutex_lock(&eli->li_list_mtx); 2906 if (!list_empty(&eli->li_request_list)) { 2907 mutex_unlock(&eli->li_list_mtx); 2908 mutex_unlock(&ext4_li_mtx); 2909 goto cont_thread; 2910 } 2911 mutex_unlock(&eli->li_list_mtx); 2912 kfree(ext4_li_info); 2913 ext4_li_info = NULL; 2914 mutex_unlock(&ext4_li_mtx); 2915 2916 return 0; 2917 } 2918 2919 static void ext4_clear_request_list(void) 2920 { 2921 struct list_head *pos, *n; 2922 struct ext4_li_request *elr; 2923 2924 mutex_lock(&ext4_li_info->li_list_mtx); 2925 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 2926 elr = list_entry(pos, struct ext4_li_request, 2927 lr_request); 2928 ext4_remove_li_request(elr); 2929 } 2930 mutex_unlock(&ext4_li_info->li_list_mtx); 2931 } 2932 2933 static int ext4_run_lazyinit_thread(void) 2934 { 2935 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 2936 ext4_li_info, "ext4lazyinit"); 2937 if (IS_ERR(ext4_lazyinit_task)) { 2938 int err = PTR_ERR(ext4_lazyinit_task); 2939 ext4_clear_request_list(); 2940 kfree(ext4_li_info); 2941 ext4_li_info = NULL; 2942 printk(KERN_CRIT "EXT4-fs: error %d creating inode table " 2943 "initialization thread\n", 2944 err); 2945 return err; 2946 } 2947 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 2948 return 0; 2949 } 2950 2951 /* 2952 * Check whether it make sense to run itable init. thread or not. 2953 * If there is at least one uninitialized inode table, return 2954 * corresponding group number, else the loop goes through all 2955 * groups and return total number of groups. 2956 */ 2957 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 2958 { 2959 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 2960 struct ext4_group_desc *gdp = NULL; 2961 2962 for (group = 0; group < ngroups; group++) { 2963 gdp = ext4_get_group_desc(sb, group, NULL); 2964 if (!gdp) 2965 continue; 2966 2967 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2968 break; 2969 } 2970 2971 return group; 2972 } 2973 2974 static int ext4_li_info_new(void) 2975 { 2976 struct ext4_lazy_init *eli = NULL; 2977 2978 eli = kzalloc(sizeof(*eli), GFP_KERNEL); 2979 if (!eli) 2980 return -ENOMEM; 2981 2982 INIT_LIST_HEAD(&eli->li_request_list); 2983 mutex_init(&eli->li_list_mtx); 2984 2985 eli->li_state |= EXT4_LAZYINIT_QUIT; 2986 2987 ext4_li_info = eli; 2988 2989 return 0; 2990 } 2991 2992 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 2993 ext4_group_t start) 2994 { 2995 struct ext4_sb_info *sbi = EXT4_SB(sb); 2996 struct ext4_li_request *elr; 2997 unsigned long rnd; 2998 2999 elr = kzalloc(sizeof(*elr), GFP_KERNEL); 3000 if (!elr) 3001 return NULL; 3002 3003 elr->lr_super = sb; 3004 elr->lr_sbi = sbi; 3005 elr->lr_next_group = start; 3006 3007 /* 3008 * Randomize first schedule time of the request to 3009 * spread the inode table initialization requests 3010 * better. 3011 */ 3012 get_random_bytes(&rnd, sizeof(rnd)); 3013 elr->lr_next_sched = jiffies + (unsigned long)rnd % 3014 (EXT4_DEF_LI_MAX_START_DELAY * HZ); 3015 3016 return elr; 3017 } 3018 3019 static int ext4_register_li_request(struct super_block *sb, 3020 ext4_group_t first_not_zeroed) 3021 { 3022 struct ext4_sb_info *sbi = EXT4_SB(sb); 3023 struct ext4_li_request *elr; 3024 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3025 int ret = 0; 3026 3027 if (sbi->s_li_request != NULL) { 3028 /* 3029 * Reset timeout so it can be computed again, because 3030 * s_li_wait_mult might have changed. 3031 */ 3032 sbi->s_li_request->lr_timeout = 0; 3033 return 0; 3034 } 3035 3036 if (first_not_zeroed == ngroups || 3037 (sb->s_flags & MS_RDONLY) || 3038 !test_opt(sb, INIT_INODE_TABLE)) 3039 return 0; 3040 3041 elr = ext4_li_request_new(sb, first_not_zeroed); 3042 if (!elr) 3043 return -ENOMEM; 3044 3045 mutex_lock(&ext4_li_mtx); 3046 3047 if (NULL == ext4_li_info) { 3048 ret = ext4_li_info_new(); 3049 if (ret) 3050 goto out; 3051 } 3052 3053 mutex_lock(&ext4_li_info->li_list_mtx); 3054 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 3055 mutex_unlock(&ext4_li_info->li_list_mtx); 3056 3057 sbi->s_li_request = elr; 3058 /* 3059 * set elr to NULL here since it has been inserted to 3060 * the request_list and the removal and free of it is 3061 * handled by ext4_clear_request_list from now on. 3062 */ 3063 elr = NULL; 3064 3065 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 3066 ret = ext4_run_lazyinit_thread(); 3067 if (ret) 3068 goto out; 3069 } 3070 out: 3071 mutex_unlock(&ext4_li_mtx); 3072 if (ret) 3073 kfree(elr); 3074 return ret; 3075 } 3076 3077 /* 3078 * We do not need to lock anything since this is called on 3079 * module unload. 3080 */ 3081 static void ext4_destroy_lazyinit_thread(void) 3082 { 3083 /* 3084 * If thread exited earlier 3085 * there's nothing to be done. 3086 */ 3087 if (!ext4_li_info || !ext4_lazyinit_task) 3088 return; 3089 3090 kthread_stop(ext4_lazyinit_task); 3091 } 3092 3093 static int set_journal_csum_feature_set(struct super_block *sb) 3094 { 3095 int ret = 1; 3096 int compat, incompat; 3097 struct ext4_sb_info *sbi = EXT4_SB(sb); 3098 3099 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3100 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 3101 /* journal checksum v2 */ 3102 compat = 0; 3103 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2; 3104 } else { 3105 /* journal checksum v1 */ 3106 compat = JBD2_FEATURE_COMPAT_CHECKSUM; 3107 incompat = 0; 3108 } 3109 3110 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3111 ret = jbd2_journal_set_features(sbi->s_journal, 3112 compat, 0, 3113 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 3114 incompat); 3115 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 3116 ret = jbd2_journal_set_features(sbi->s_journal, 3117 compat, 0, 3118 incompat); 3119 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3120 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3121 } else { 3122 jbd2_journal_clear_features(sbi->s_journal, 3123 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3124 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | 3125 JBD2_FEATURE_INCOMPAT_CSUM_V2); 3126 } 3127 3128 return ret; 3129 } 3130 3131 /* 3132 * Note: calculating the overhead so we can be compatible with 3133 * historical BSD practice is quite difficult in the face of 3134 * clusters/bigalloc. This is because multiple metadata blocks from 3135 * different block group can end up in the same allocation cluster. 3136 * Calculating the exact overhead in the face of clustered allocation 3137 * requires either O(all block bitmaps) in memory or O(number of block 3138 * groups**2) in time. We will still calculate the superblock for 3139 * older file systems --- and if we come across with a bigalloc file 3140 * system with zero in s_overhead_clusters the estimate will be close to 3141 * correct especially for very large cluster sizes --- but for newer 3142 * file systems, it's better to calculate this figure once at mkfs 3143 * time, and store it in the superblock. If the superblock value is 3144 * present (even for non-bigalloc file systems), we will use it. 3145 */ 3146 static int count_overhead(struct super_block *sb, ext4_group_t grp, 3147 char *buf) 3148 { 3149 struct ext4_sb_info *sbi = EXT4_SB(sb); 3150 struct ext4_group_desc *gdp; 3151 ext4_fsblk_t first_block, last_block, b; 3152 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3153 int s, j, count = 0; 3154 3155 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) 3156 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + 3157 sbi->s_itb_per_group + 2); 3158 3159 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + 3160 (grp * EXT4_BLOCKS_PER_GROUP(sb)); 3161 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; 3162 for (i = 0; i < ngroups; i++) { 3163 gdp = ext4_get_group_desc(sb, i, NULL); 3164 b = ext4_block_bitmap(sb, gdp); 3165 if (b >= first_block && b <= last_block) { 3166 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3167 count++; 3168 } 3169 b = ext4_inode_bitmap(sb, gdp); 3170 if (b >= first_block && b <= last_block) { 3171 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); 3172 count++; 3173 } 3174 b = ext4_inode_table(sb, gdp); 3175 if (b >= first_block && b + sbi->s_itb_per_group <= last_block) 3176 for (j = 0; j < sbi->s_itb_per_group; j++, b++) { 3177 int c = EXT4_B2C(sbi, b - first_block); 3178 ext4_set_bit(c, buf); 3179 count++; 3180 } 3181 if (i != grp) 3182 continue; 3183 s = 0; 3184 if (ext4_bg_has_super(sb, grp)) { 3185 ext4_set_bit(s++, buf); 3186 count++; 3187 } 3188 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { 3189 ext4_set_bit(EXT4_B2C(sbi, s++), buf); 3190 count++; 3191 } 3192 } 3193 if (!count) 3194 return 0; 3195 return EXT4_CLUSTERS_PER_GROUP(sb) - 3196 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); 3197 } 3198 3199 /* 3200 * Compute the overhead and stash it in sbi->s_overhead 3201 */ 3202 int ext4_calculate_overhead(struct super_block *sb) 3203 { 3204 struct ext4_sb_info *sbi = EXT4_SB(sb); 3205 struct ext4_super_block *es = sbi->s_es; 3206 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3207 ext4_fsblk_t overhead = 0; 3208 char *buf = (char *) get_zeroed_page(GFP_KERNEL); 3209 3210 if (!buf) 3211 return -ENOMEM; 3212 3213 /* 3214 * Compute the overhead (FS structures). This is constant 3215 * for a given filesystem unless the number of block groups 3216 * changes so we cache the previous value until it does. 3217 */ 3218 3219 /* 3220 * All of the blocks before first_data_block are overhead 3221 */ 3222 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 3223 3224 /* 3225 * Add the overhead found in each block group 3226 */ 3227 for (i = 0; i < ngroups; i++) { 3228 int blks; 3229 3230 blks = count_overhead(sb, i, buf); 3231 overhead += blks; 3232 if (blks) 3233 memset(buf, 0, PAGE_SIZE); 3234 cond_resched(); 3235 } 3236 /* Add the journal blocks as well */ 3237 if (sbi->s_journal) 3238 overhead += EXT4_B2C(sbi, sbi->s_journal->j_maxlen); 3239 3240 sbi->s_overhead = overhead; 3241 smp_wmb(); 3242 free_page((unsigned long) buf); 3243 return 0; 3244 } 3245 3246 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3247 { 3248 char *orig_data = kstrdup(data, GFP_KERNEL); 3249 struct buffer_head *bh; 3250 struct ext4_super_block *es = NULL; 3251 struct ext4_sb_info *sbi; 3252 ext4_fsblk_t block; 3253 ext4_fsblk_t sb_block = get_sb_block(&data); 3254 ext4_fsblk_t logical_sb_block; 3255 unsigned long offset = 0; 3256 unsigned long journal_devnum = 0; 3257 unsigned long def_mount_opts; 3258 struct inode *root; 3259 char *cp; 3260 const char *descr; 3261 int ret = -ENOMEM; 3262 int blocksize, clustersize; 3263 unsigned int db_count; 3264 unsigned int i; 3265 int needs_recovery, has_huge_files, has_bigalloc; 3266 __u64 blocks_count; 3267 int err = 0; 3268 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3269 ext4_group_t first_not_zeroed; 3270 3271 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3272 if (!sbi) 3273 goto out_free_orig; 3274 3275 sbi->s_blockgroup_lock = 3276 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3277 if (!sbi->s_blockgroup_lock) { 3278 kfree(sbi); 3279 goto out_free_orig; 3280 } 3281 sb->s_fs_info = sbi; 3282 sbi->s_sb = sb; 3283 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3284 sbi->s_sb_block = sb_block; 3285 if (sb->s_bdev->bd_part) 3286 sbi->s_sectors_written_start = 3287 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3288 3289 /* Cleanup superblock name */ 3290 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 3291 *cp = '!'; 3292 3293 /* -EINVAL is default */ 3294 ret = -EINVAL; 3295 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3296 if (!blocksize) { 3297 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3298 goto out_fail; 3299 } 3300 3301 /* 3302 * The ext4 superblock will not be buffer aligned for other than 1kB 3303 * block sizes. We need to calculate the offset from buffer start. 3304 */ 3305 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 3306 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3307 offset = do_div(logical_sb_block, blocksize); 3308 } else { 3309 logical_sb_block = sb_block; 3310 } 3311 3312 if (!(bh = sb_bread(sb, logical_sb_block))) { 3313 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3314 goto out_fail; 3315 } 3316 /* 3317 * Note: s_es must be initialized as soon as possible because 3318 * some ext4 macro-instructions depend on its value 3319 */ 3320 es = (struct ext4_super_block *) (bh->b_data + offset); 3321 sbi->s_es = es; 3322 sb->s_magic = le16_to_cpu(es->s_magic); 3323 if (sb->s_magic != EXT4_SUPER_MAGIC) 3324 goto cantfind_ext4; 3325 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3326 3327 /* Warn if metadata_csum and gdt_csum are both set. */ 3328 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3329 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 3330 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) 3331 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are " 3332 "redundant flags; please run fsck."); 3333 3334 /* Check for a known checksum algorithm */ 3335 if (!ext4_verify_csum_type(sb, es)) { 3336 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3337 "unknown checksum algorithm."); 3338 silent = 1; 3339 goto cantfind_ext4; 3340 } 3341 3342 /* Load the checksum driver */ 3343 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3344 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 3345 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 3346 if (IS_ERR(sbi->s_chksum_driver)) { 3347 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); 3348 ret = PTR_ERR(sbi->s_chksum_driver); 3349 sbi->s_chksum_driver = NULL; 3350 goto failed_mount; 3351 } 3352 } 3353 3354 /* Check superblock checksum */ 3355 if (!ext4_superblock_csum_verify(sb, es)) { 3356 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " 3357 "invalid superblock checksum. Run e2fsck?"); 3358 silent = 1; 3359 goto cantfind_ext4; 3360 } 3361 3362 /* Precompute checksum seed for all metadata */ 3363 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3364 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 3365 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, 3366 sizeof(es->s_uuid)); 3367 3368 /* Set defaults before we parse the mount options */ 3369 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3370 set_opt(sb, INIT_INODE_TABLE); 3371 if (def_mount_opts & EXT4_DEFM_DEBUG) 3372 set_opt(sb, DEBUG); 3373 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 3374 set_opt(sb, GRPID); 3375 if (def_mount_opts & EXT4_DEFM_UID16) 3376 set_opt(sb, NO_UID32); 3377 /* xattr user namespace & acls are now defaulted on */ 3378 set_opt(sb, XATTR_USER); 3379 #ifdef CONFIG_EXT4_FS_POSIX_ACL 3380 set_opt(sb, POSIX_ACL); 3381 #endif 3382 set_opt(sb, MBLK_IO_SUBMIT); 3383 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3384 set_opt(sb, JOURNAL_DATA); 3385 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3386 set_opt(sb, ORDERED_DATA); 3387 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3388 set_opt(sb, WRITEBACK_DATA); 3389 3390 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3391 set_opt(sb, ERRORS_PANIC); 3392 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3393 set_opt(sb, ERRORS_CONT); 3394 else 3395 set_opt(sb, ERRORS_RO); 3396 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) 3397 set_opt(sb, BLOCK_VALIDITY); 3398 if (def_mount_opts & EXT4_DEFM_DISCARD) 3399 set_opt(sb, DISCARD); 3400 3401 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 3402 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 3403 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 3404 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 3405 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3406 3407 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3408 set_opt(sb, BARRIER); 3409 3410 /* 3411 * enable delayed allocation by default 3412 * Use -o nodelalloc to turn it off 3413 */ 3414 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && 3415 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3416 set_opt(sb, DELALLOC); 3417 3418 /* 3419 * set default s_li_wait_mult for lazyinit, for the case there is 3420 * no mount option specified. 3421 */ 3422 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 3423 3424 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 3425 &journal_devnum, &journal_ioprio, 0)) { 3426 ext4_msg(sb, KERN_WARNING, 3427 "failed to parse options in superblock: %s", 3428 sbi->s_es->s_mount_opts); 3429 } 3430 sbi->s_def_mount_opt = sbi->s_mount_opt; 3431 if (!parse_options((char *) data, sb, &journal_devnum, 3432 &journal_ioprio, 0)) 3433 goto failed_mount; 3434 3435 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3436 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " 3437 "with data=journal disables delayed " 3438 "allocation and O_DIRECT support!\n"); 3439 if (test_opt2(sb, EXPLICIT_DELALLOC)) { 3440 ext4_msg(sb, KERN_ERR, "can't mount with " 3441 "both data=journal and delalloc"); 3442 goto failed_mount; 3443 } 3444 if (test_opt(sb, DIOREAD_NOLOCK)) { 3445 ext4_msg(sb, KERN_ERR, "can't mount with " 3446 "both data=journal and delalloc"); 3447 goto failed_mount; 3448 } 3449 if (test_opt(sb, DELALLOC)) 3450 clear_opt(sb, DELALLOC); 3451 } 3452 3453 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3454 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3455 3456 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3457 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 3458 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 3459 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 3460 ext4_msg(sb, KERN_WARNING, 3461 "feature flags set on rev 0 fs, " 3462 "running e2fsck is recommended"); 3463 3464 if (IS_EXT2_SB(sb)) { 3465 if (ext2_feature_set_ok(sb)) 3466 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 3467 "using the ext4 subsystem"); 3468 else { 3469 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 3470 "to feature incompatibilities"); 3471 goto failed_mount; 3472 } 3473 } 3474 3475 if (IS_EXT3_SB(sb)) { 3476 if (ext3_feature_set_ok(sb)) 3477 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 3478 "using the ext4 subsystem"); 3479 else { 3480 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 3481 "to feature incompatibilities"); 3482 goto failed_mount; 3483 } 3484 } 3485 3486 /* 3487 * Check feature flags regardless of the revision level, since we 3488 * previously didn't change the revision level when setting the flags, 3489 * so there is a chance incompat flags are set on a rev 0 filesystem. 3490 */ 3491 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3492 goto failed_mount; 3493 3494 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 3495 if (blocksize < EXT4_MIN_BLOCK_SIZE || 3496 blocksize > EXT4_MAX_BLOCK_SIZE) { 3497 ext4_msg(sb, KERN_ERR, 3498 "Unsupported filesystem blocksize %d", blocksize); 3499 goto failed_mount; 3500 } 3501 3502 if (sb->s_blocksize != blocksize) { 3503 /* Validate the filesystem blocksize */ 3504 if (!sb_set_blocksize(sb, blocksize)) { 3505 ext4_msg(sb, KERN_ERR, "bad block size %d", 3506 blocksize); 3507 goto failed_mount; 3508 } 3509 3510 brelse(bh); 3511 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3512 offset = do_div(logical_sb_block, blocksize); 3513 bh = sb_bread(sb, logical_sb_block); 3514 if (!bh) { 3515 ext4_msg(sb, KERN_ERR, 3516 "Can't read superblock on 2nd try"); 3517 goto failed_mount; 3518 } 3519 es = (struct ext4_super_block *)(bh->b_data + offset); 3520 sbi->s_es = es; 3521 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3522 ext4_msg(sb, KERN_ERR, 3523 "Magic mismatch, very weird!"); 3524 goto failed_mount; 3525 } 3526 } 3527 3528 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3529 EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 3530 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3531 has_huge_files); 3532 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3533 3534 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3535 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3536 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3537 } else { 3538 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3539 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3540 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 3541 (!is_power_of_2(sbi->s_inode_size)) || 3542 (sbi->s_inode_size > blocksize)) { 3543 ext4_msg(sb, KERN_ERR, 3544 "unsupported inode size: %d", 3545 sbi->s_inode_size); 3546 goto failed_mount; 3547 } 3548 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3549 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3550 } 3551 3552 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 3553 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 3554 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 3555 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3556 !is_power_of_2(sbi->s_desc_size)) { 3557 ext4_msg(sb, KERN_ERR, 3558 "unsupported descriptor size %lu", 3559 sbi->s_desc_size); 3560 goto failed_mount; 3561 } 3562 } else 3563 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 3564 3565 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3566 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3567 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 3568 goto cantfind_ext4; 3569 3570 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3571 if (sbi->s_inodes_per_block == 0) 3572 goto cantfind_ext4; 3573 sbi->s_itb_per_group = sbi->s_inodes_per_group / 3574 sbi->s_inodes_per_block; 3575 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3576 sbi->s_sbh = bh; 3577 sbi->s_mount_state = le16_to_cpu(es->s_state); 3578 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3579 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 3580 3581 for (i = 0; i < 4; i++) 3582 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3583 sbi->s_def_hash_version = es->s_def_hash_version; 3584 i = le32_to_cpu(es->s_flags); 3585 if (i & EXT2_FLAGS_UNSIGNED_HASH) 3586 sbi->s_hash_unsigned = 3; 3587 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3588 #ifdef __CHAR_UNSIGNED__ 3589 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3590 sbi->s_hash_unsigned = 3; 3591 #else 3592 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3593 #endif 3594 } 3595 3596 /* Handle clustersize */ 3597 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 3598 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3599 EXT4_FEATURE_RO_COMPAT_BIGALLOC); 3600 if (has_bigalloc) { 3601 if (clustersize < blocksize) { 3602 ext4_msg(sb, KERN_ERR, 3603 "cluster size (%d) smaller than " 3604 "block size (%d)", clustersize, blocksize); 3605 goto failed_mount; 3606 } 3607 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 3608 le32_to_cpu(es->s_log_block_size); 3609 sbi->s_clusters_per_group = 3610 le32_to_cpu(es->s_clusters_per_group); 3611 if (sbi->s_clusters_per_group > blocksize * 8) { 3612 ext4_msg(sb, KERN_ERR, 3613 "#clusters per group too big: %lu", 3614 sbi->s_clusters_per_group); 3615 goto failed_mount; 3616 } 3617 if (sbi->s_blocks_per_group != 3618 (sbi->s_clusters_per_group * (clustersize / blocksize))) { 3619 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " 3620 "clusters per group (%lu) inconsistent", 3621 sbi->s_blocks_per_group, 3622 sbi->s_clusters_per_group); 3623 goto failed_mount; 3624 } 3625 } else { 3626 if (clustersize != blocksize) { 3627 ext4_warning(sb, "fragment/cluster size (%d) != " 3628 "block size (%d)", clustersize, 3629 blocksize); 3630 clustersize = blocksize; 3631 } 3632 if (sbi->s_blocks_per_group > blocksize * 8) { 3633 ext4_msg(sb, KERN_ERR, 3634 "#blocks per group too big: %lu", 3635 sbi->s_blocks_per_group); 3636 goto failed_mount; 3637 } 3638 sbi->s_clusters_per_group = sbi->s_blocks_per_group; 3639 sbi->s_cluster_bits = 0; 3640 } 3641 sbi->s_cluster_ratio = clustersize / blocksize; 3642 3643 if (sbi->s_inodes_per_group > blocksize * 8) { 3644 ext4_msg(sb, KERN_ERR, 3645 "#inodes per group too big: %lu", 3646 sbi->s_inodes_per_group); 3647 goto failed_mount; 3648 } 3649 3650 /* 3651 * Test whether we have more sectors than will fit in sector_t, 3652 * and whether the max offset is addressable by the page cache. 3653 */ 3654 err = generic_check_addressable(sb->s_blocksize_bits, 3655 ext4_blocks_count(es)); 3656 if (err) { 3657 ext4_msg(sb, KERN_ERR, "filesystem" 3658 " too large to mount safely on this system"); 3659 if (sizeof(sector_t) < 8) 3660 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 3661 goto failed_mount; 3662 } 3663 3664 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3665 goto cantfind_ext4; 3666 3667 /* check blocks count against device size */ 3668 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 3669 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3670 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3671 "exceeds size of device (%llu blocks)", 3672 ext4_blocks_count(es), blocks_count); 3673 goto failed_mount; 3674 } 3675 3676 /* 3677 * It makes no sense for the first data block to be beyond the end 3678 * of the filesystem. 3679 */ 3680 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3681 ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 3682 "block %u is beyond end of filesystem (%llu)", 3683 le32_to_cpu(es->s_first_data_block), 3684 ext4_blocks_count(es)); 3685 goto failed_mount; 3686 } 3687 blocks_count = (ext4_blocks_count(es) - 3688 le32_to_cpu(es->s_first_data_block) + 3689 EXT4_BLOCKS_PER_GROUP(sb) - 1); 3690 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 3691 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3692 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 3693 "(block count %llu, first data block %u, " 3694 "blocks per group %lu)", sbi->s_groups_count, 3695 ext4_blocks_count(es), 3696 le32_to_cpu(es->s_first_data_block), 3697 EXT4_BLOCKS_PER_GROUP(sb)); 3698 goto failed_mount; 3699 } 3700 sbi->s_groups_count = blocks_count; 3701 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3702 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3703 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3704 EXT4_DESC_PER_BLOCK(sb); 3705 sbi->s_group_desc = ext4_kvmalloc(db_count * 3706 sizeof(struct buffer_head *), 3707 GFP_KERNEL); 3708 if (sbi->s_group_desc == NULL) { 3709 ext4_msg(sb, KERN_ERR, "not enough memory"); 3710 ret = -ENOMEM; 3711 goto failed_mount; 3712 } 3713 3714 if (ext4_proc_root) 3715 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 3716 3717 if (sbi->s_proc) 3718 proc_create_data("options", S_IRUGO, sbi->s_proc, 3719 &ext4_seq_options_fops, sb); 3720 3721 bgl_lock_init(sbi->s_blockgroup_lock); 3722 3723 for (i = 0; i < db_count; i++) { 3724 block = descriptor_loc(sb, logical_sb_block, i); 3725 sbi->s_group_desc[i] = sb_bread(sb, block); 3726 if (!sbi->s_group_desc[i]) { 3727 ext4_msg(sb, KERN_ERR, 3728 "can't read group descriptor %d", i); 3729 db_count = i; 3730 goto failed_mount2; 3731 } 3732 } 3733 if (!ext4_check_descriptors(sb, &first_not_zeroed)) { 3734 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3735 goto failed_mount2; 3736 } 3737 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 3738 if (!ext4_fill_flex_info(sb)) { 3739 ext4_msg(sb, KERN_ERR, 3740 "unable to initialize " 3741 "flex_bg meta info!"); 3742 goto failed_mount2; 3743 } 3744 3745 sbi->s_gdb_count = db_count; 3746 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3747 spin_lock_init(&sbi->s_next_gen_lock); 3748 3749 init_timer(&sbi->s_err_report); 3750 sbi->s_err_report.function = print_daily_error_info; 3751 sbi->s_err_report.data = (unsigned long) sb; 3752 3753 err = percpu_counter_init(&sbi->s_freeclusters_counter, 3754 ext4_count_free_clusters(sb)); 3755 if (!err) { 3756 err = percpu_counter_init(&sbi->s_freeinodes_counter, 3757 ext4_count_free_inodes(sb)); 3758 } 3759 if (!err) { 3760 err = percpu_counter_init(&sbi->s_dirs_counter, 3761 ext4_count_dirs(sb)); 3762 } 3763 if (!err) { 3764 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0); 3765 } 3766 if (err) { 3767 ext4_msg(sb, KERN_ERR, "insufficient memory"); 3768 goto failed_mount3; 3769 } 3770 3771 sbi->s_stripe = ext4_get_stripe_size(sbi); 3772 sbi->s_max_writeback_mb_bump = 128; 3773 sbi->s_extent_max_zeroout_kb = 32; 3774 3775 /* 3776 * set up enough so that it can read an inode 3777 */ 3778 if (!test_opt(sb, NOLOAD) && 3779 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 3780 sb->s_op = &ext4_sops; 3781 else 3782 sb->s_op = &ext4_nojournal_sops; 3783 sb->s_export_op = &ext4_export_ops; 3784 sb->s_xattr = ext4_xattr_handlers; 3785 #ifdef CONFIG_QUOTA 3786 sb->s_qcop = &ext4_qctl_operations; 3787 sb->dq_op = &ext4_quota_operations; 3788 3789 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) { 3790 /* Use qctl operations for hidden quota files. */ 3791 sb->s_qcop = &ext4_qctl_sysfile_operations; 3792 } 3793 #endif 3794 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3795 3796 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 3797 mutex_init(&sbi->s_orphan_lock); 3798 3799 sb->s_root = NULL; 3800 3801 needs_recovery = (es->s_last_orphan != 0 || 3802 EXT4_HAS_INCOMPAT_FEATURE(sb, 3803 EXT4_FEATURE_INCOMPAT_RECOVER)); 3804 3805 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) && 3806 !(sb->s_flags & MS_RDONLY)) 3807 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 3808 goto failed_mount3; 3809 3810 /* 3811 * The first inode we look at is the journal inode. Don't try 3812 * root first: it may be modified in the journal! 3813 */ 3814 if (!test_opt(sb, NOLOAD) && 3815 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3816 if (ext4_load_journal(sb, es, journal_devnum)) 3817 goto failed_mount3; 3818 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 3819 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3820 ext4_msg(sb, KERN_ERR, "required journal recovery " 3821 "suppressed and not mounted read-only"); 3822 goto failed_mount_wq; 3823 } else { 3824 clear_opt(sb, DATA_FLAGS); 3825 sbi->s_journal = NULL; 3826 needs_recovery = 0; 3827 goto no_journal; 3828 } 3829 3830 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) && 3831 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 3832 JBD2_FEATURE_INCOMPAT_64BIT)) { 3833 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 3834 goto failed_mount_wq; 3835 } 3836 3837 if (!set_journal_csum_feature_set(sb)) { 3838 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " 3839 "feature set"); 3840 goto failed_mount_wq; 3841 } 3842 3843 /* We have now updated the journal if required, so we can 3844 * validate the data journaling mode. */ 3845 switch (test_opt(sb, DATA_FLAGS)) { 3846 case 0: 3847 /* No mode set, assume a default based on the journal 3848 * capabilities: ORDERED_DATA if the journal can 3849 * cope, else JOURNAL_DATA 3850 */ 3851 if (jbd2_journal_check_available_features 3852 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3853 set_opt(sb, ORDERED_DATA); 3854 else 3855 set_opt(sb, JOURNAL_DATA); 3856 break; 3857 3858 case EXT4_MOUNT_ORDERED_DATA: 3859 case EXT4_MOUNT_WRITEBACK_DATA: 3860 if (!jbd2_journal_check_available_features 3861 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3862 ext4_msg(sb, KERN_ERR, "Journal does not support " 3863 "requested data journaling mode"); 3864 goto failed_mount_wq; 3865 } 3866 default: 3867 break; 3868 } 3869 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3870 3871 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; 3872 3873 /* 3874 * The journal may have updated the bg summary counts, so we 3875 * need to update the global counters. 3876 */ 3877 percpu_counter_set(&sbi->s_freeclusters_counter, 3878 ext4_count_free_clusters(sb)); 3879 percpu_counter_set(&sbi->s_freeinodes_counter, 3880 ext4_count_free_inodes(sb)); 3881 percpu_counter_set(&sbi->s_dirs_counter, 3882 ext4_count_dirs(sb)); 3883 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0); 3884 3885 no_journal: 3886 /* 3887 * Get the # of file system overhead blocks from the 3888 * superblock if present. 3889 */ 3890 if (es->s_overhead_clusters) 3891 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); 3892 else { 3893 err = ext4_calculate_overhead(sb); 3894 if (err) 3895 goto failed_mount_wq; 3896 } 3897 3898 /* 3899 * The maximum number of concurrent works can be high and 3900 * concurrency isn't really necessary. Limit it to 1. 3901 */ 3902 EXT4_SB(sb)->dio_unwritten_wq = 3903 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 3904 if (!EXT4_SB(sb)->dio_unwritten_wq) { 3905 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); 3906 ret = -ENOMEM; 3907 goto failed_mount_wq; 3908 } 3909 3910 /* 3911 * The jbd2_journal_load will have done any necessary log recovery, 3912 * so we can safely mount the rest of the filesystem now. 3913 */ 3914 3915 root = ext4_iget(sb, EXT4_ROOT_INO); 3916 if (IS_ERR(root)) { 3917 ext4_msg(sb, KERN_ERR, "get root inode failed"); 3918 ret = PTR_ERR(root); 3919 root = NULL; 3920 goto failed_mount4; 3921 } 3922 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3923 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 3924 iput(root); 3925 goto failed_mount4; 3926 } 3927 sb->s_root = d_make_root(root); 3928 if (!sb->s_root) { 3929 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 3930 ret = -ENOMEM; 3931 goto failed_mount4; 3932 } 3933 3934 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) 3935 sb->s_flags |= MS_RDONLY; 3936 3937 /* determine the minimum size of new large inodes, if present */ 3938 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3939 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3940 EXT4_GOOD_OLD_INODE_SIZE; 3941 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3942 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 3943 if (sbi->s_want_extra_isize < 3944 le16_to_cpu(es->s_want_extra_isize)) 3945 sbi->s_want_extra_isize = 3946 le16_to_cpu(es->s_want_extra_isize); 3947 if (sbi->s_want_extra_isize < 3948 le16_to_cpu(es->s_min_extra_isize)) 3949 sbi->s_want_extra_isize = 3950 le16_to_cpu(es->s_min_extra_isize); 3951 } 3952 } 3953 /* Check if enough inode space is available */ 3954 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3955 sbi->s_inode_size) { 3956 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3957 EXT4_GOOD_OLD_INODE_SIZE; 3958 ext4_msg(sb, KERN_INFO, "required extra inode space not" 3959 "available"); 3960 } 3961 3962 err = ext4_setup_system_zone(sb); 3963 if (err) { 3964 ext4_msg(sb, KERN_ERR, "failed to initialize system " 3965 "zone (%d)", err); 3966 goto failed_mount4a; 3967 } 3968 3969 ext4_ext_init(sb); 3970 err = ext4_mb_init(sb); 3971 if (err) { 3972 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3973 err); 3974 goto failed_mount5; 3975 } 3976 3977 err = ext4_register_li_request(sb, first_not_zeroed); 3978 if (err) 3979 goto failed_mount6; 3980 3981 sbi->s_kobj.kset = ext4_kset; 3982 init_completion(&sbi->s_kobj_unregister); 3983 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 3984 "%s", sb->s_id); 3985 if (err) 3986 goto failed_mount7; 3987 3988 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3989 ext4_orphan_cleanup(sb, es); 3990 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 3991 if (needs_recovery) { 3992 ext4_msg(sb, KERN_INFO, "recovery complete"); 3993 ext4_mark_recovery_complete(sb, es); 3994 } 3995 if (EXT4_SB(sb)->s_journal) { 3996 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3997 descr = " journalled data mode"; 3998 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3999 descr = " ordered data mode"; 4000 else 4001 descr = " writeback data mode"; 4002 } else 4003 descr = "out journal"; 4004 4005 #ifdef CONFIG_QUOTA 4006 /* Enable quota usage during mount. */ 4007 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && 4008 !(sb->s_flags & MS_RDONLY)) { 4009 err = ext4_enable_quotas(sb); 4010 if (err) 4011 goto failed_mount7; 4012 } 4013 #endif /* CONFIG_QUOTA */ 4014 4015 if (test_opt(sb, DISCARD)) { 4016 struct request_queue *q = bdev_get_queue(sb->s_bdev); 4017 if (!blk_queue_discard(q)) 4018 ext4_msg(sb, KERN_WARNING, 4019 "mounting with \"discard\" option, but " 4020 "the device does not support discard"); 4021 } 4022 4023 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 4024 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 4025 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 4026 4027 if (es->s_error_count) 4028 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 4029 4030 kfree(orig_data); 4031 return 0; 4032 4033 cantfind_ext4: 4034 if (!silent) 4035 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 4036 goto failed_mount; 4037 4038 failed_mount7: 4039 ext4_unregister_li_request(sb); 4040 failed_mount6: 4041 ext4_mb_release(sb); 4042 failed_mount5: 4043 ext4_ext_release(sb); 4044 ext4_release_system_zone(sb); 4045 failed_mount4a: 4046 dput(sb->s_root); 4047 sb->s_root = NULL; 4048 failed_mount4: 4049 ext4_msg(sb, KERN_ERR, "mount failed"); 4050 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); 4051 failed_mount_wq: 4052 if (sbi->s_journal) { 4053 jbd2_journal_destroy(sbi->s_journal); 4054 sbi->s_journal = NULL; 4055 } 4056 failed_mount3: 4057 del_timer(&sbi->s_err_report); 4058 if (sbi->s_flex_groups) 4059 ext4_kvfree(sbi->s_flex_groups); 4060 percpu_counter_destroy(&sbi->s_freeclusters_counter); 4061 percpu_counter_destroy(&sbi->s_freeinodes_counter); 4062 percpu_counter_destroy(&sbi->s_dirs_counter); 4063 percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 4064 if (sbi->s_mmp_tsk) 4065 kthread_stop(sbi->s_mmp_tsk); 4066 failed_mount2: 4067 for (i = 0; i < db_count; i++) 4068 brelse(sbi->s_group_desc[i]); 4069 ext4_kvfree(sbi->s_group_desc); 4070 failed_mount: 4071 if (sbi->s_chksum_driver) 4072 crypto_free_shash(sbi->s_chksum_driver); 4073 if (sbi->s_proc) { 4074 remove_proc_entry("options", sbi->s_proc); 4075 remove_proc_entry(sb->s_id, ext4_proc_root); 4076 } 4077 #ifdef CONFIG_QUOTA 4078 for (i = 0; i < MAXQUOTAS; i++) 4079 kfree(sbi->s_qf_names[i]); 4080 #endif 4081 ext4_blkdev_remove(sbi); 4082 brelse(bh); 4083 out_fail: 4084 sb->s_fs_info = NULL; 4085 kfree(sbi->s_blockgroup_lock); 4086 kfree(sbi); 4087 out_free_orig: 4088 kfree(orig_data); 4089 return err ? err : ret; 4090 } 4091 4092 /* 4093 * Setup any per-fs journal parameters now. We'll do this both on 4094 * initial mount, once the journal has been initialised but before we've 4095 * done any recovery; and again on any subsequent remount. 4096 */ 4097 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 4098 { 4099 struct ext4_sb_info *sbi = EXT4_SB(sb); 4100 4101 journal->j_commit_interval = sbi->s_commit_interval; 4102 journal->j_min_batch_time = sbi->s_min_batch_time; 4103 journal->j_max_batch_time = sbi->s_max_batch_time; 4104 4105 write_lock(&journal->j_state_lock); 4106 if (test_opt(sb, BARRIER)) 4107 journal->j_flags |= JBD2_BARRIER; 4108 else 4109 journal->j_flags &= ~JBD2_BARRIER; 4110 if (test_opt(sb, DATA_ERR_ABORT)) 4111 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 4112 else 4113 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 4114 write_unlock(&journal->j_state_lock); 4115 } 4116 4117 static journal_t *ext4_get_journal(struct super_block *sb, 4118 unsigned int journal_inum) 4119 { 4120 struct inode *journal_inode; 4121 journal_t *journal; 4122 4123 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4124 4125 /* First, test for the existence of a valid inode on disk. Bad 4126 * things happen if we iget() an unused inode, as the subsequent 4127 * iput() will try to delete it. */ 4128 4129 journal_inode = ext4_iget(sb, journal_inum); 4130 if (IS_ERR(journal_inode)) { 4131 ext4_msg(sb, KERN_ERR, "no journal found"); 4132 return NULL; 4133 } 4134 if (!journal_inode->i_nlink) { 4135 make_bad_inode(journal_inode); 4136 iput(journal_inode); 4137 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 4138 return NULL; 4139 } 4140 4141 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 4142 journal_inode, journal_inode->i_size); 4143 if (!S_ISREG(journal_inode->i_mode)) { 4144 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 4145 iput(journal_inode); 4146 return NULL; 4147 } 4148 4149 journal = jbd2_journal_init_inode(journal_inode); 4150 if (!journal) { 4151 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 4152 iput(journal_inode); 4153 return NULL; 4154 } 4155 journal->j_private = sb; 4156 ext4_init_journal_params(sb, journal); 4157 return journal; 4158 } 4159 4160 static journal_t *ext4_get_dev_journal(struct super_block *sb, 4161 dev_t j_dev) 4162 { 4163 struct buffer_head *bh; 4164 journal_t *journal; 4165 ext4_fsblk_t start; 4166 ext4_fsblk_t len; 4167 int hblock, blocksize; 4168 ext4_fsblk_t sb_block; 4169 unsigned long offset; 4170 struct ext4_super_block *es; 4171 struct block_device *bdev; 4172 4173 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4174 4175 bdev = ext4_blkdev_get(j_dev, sb); 4176 if (bdev == NULL) 4177 return NULL; 4178 4179 blocksize = sb->s_blocksize; 4180 hblock = bdev_logical_block_size(bdev); 4181 if (blocksize < hblock) { 4182 ext4_msg(sb, KERN_ERR, 4183 "blocksize too small for journal device"); 4184 goto out_bdev; 4185 } 4186 4187 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 4188 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 4189 set_blocksize(bdev, blocksize); 4190 if (!(bh = __bread(bdev, sb_block, blocksize))) { 4191 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 4192 "external journal"); 4193 goto out_bdev; 4194 } 4195 4196 es = (struct ext4_super_block *) (bh->b_data + offset); 4197 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 4198 !(le32_to_cpu(es->s_feature_incompat) & 4199 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 4200 ext4_msg(sb, KERN_ERR, "external journal has " 4201 "bad superblock"); 4202 brelse(bh); 4203 goto out_bdev; 4204 } 4205 4206 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 4207 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 4208 brelse(bh); 4209 goto out_bdev; 4210 } 4211 4212 len = ext4_blocks_count(es); 4213 start = sb_block + 1; 4214 brelse(bh); /* we're done with the superblock */ 4215 4216 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 4217 start, len, blocksize); 4218 if (!journal) { 4219 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 4220 goto out_bdev; 4221 } 4222 journal->j_private = sb; 4223 ll_rw_block(READ, 1, &journal->j_sb_buffer); 4224 wait_on_buffer(journal->j_sb_buffer); 4225 if (!buffer_uptodate(journal->j_sb_buffer)) { 4226 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 4227 goto out_journal; 4228 } 4229 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 4230 ext4_msg(sb, KERN_ERR, "External journal has more than one " 4231 "user (unsupported) - %d", 4232 be32_to_cpu(journal->j_superblock->s_nr_users)); 4233 goto out_journal; 4234 } 4235 EXT4_SB(sb)->journal_bdev = bdev; 4236 ext4_init_journal_params(sb, journal); 4237 return journal; 4238 4239 out_journal: 4240 jbd2_journal_destroy(journal); 4241 out_bdev: 4242 ext4_blkdev_put(bdev); 4243 return NULL; 4244 } 4245 4246 static int ext4_load_journal(struct super_block *sb, 4247 struct ext4_super_block *es, 4248 unsigned long journal_devnum) 4249 { 4250 journal_t *journal; 4251 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 4252 dev_t journal_dev; 4253 int err = 0; 4254 int really_read_only; 4255 4256 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4257 4258 if (journal_devnum && 4259 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4260 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 4261 "numbers have changed"); 4262 journal_dev = new_decode_dev(journal_devnum); 4263 } else 4264 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 4265 4266 really_read_only = bdev_read_only(sb->s_bdev); 4267 4268 /* 4269 * Are we loading a blank journal or performing recovery after a 4270 * crash? For recovery, we need to check in advance whether we 4271 * can get read-write access to the device. 4272 */ 4273 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 4274 if (sb->s_flags & MS_RDONLY) { 4275 ext4_msg(sb, KERN_INFO, "INFO: recovery " 4276 "required on readonly filesystem"); 4277 if (really_read_only) { 4278 ext4_msg(sb, KERN_ERR, "write access " 4279 "unavailable, cannot proceed"); 4280 return -EROFS; 4281 } 4282 ext4_msg(sb, KERN_INFO, "write access will " 4283 "be enabled during recovery"); 4284 } 4285 } 4286 4287 if (journal_inum && journal_dev) { 4288 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4289 "and inode journals!"); 4290 return -EINVAL; 4291 } 4292 4293 if (journal_inum) { 4294 if (!(journal = ext4_get_journal(sb, journal_inum))) 4295 return -EINVAL; 4296 } else { 4297 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4298 return -EINVAL; 4299 } 4300 4301 if (!(journal->j_flags & JBD2_BARRIER)) 4302 ext4_msg(sb, KERN_INFO, "barriers disabled"); 4303 4304 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 4305 err = jbd2_journal_wipe(journal, !really_read_only); 4306 if (!err) { 4307 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 4308 if (save) 4309 memcpy(save, ((char *) es) + 4310 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4311 err = jbd2_journal_load(journal); 4312 if (save) 4313 memcpy(((char *) es) + EXT4_S_ERR_START, 4314 save, EXT4_S_ERR_LEN); 4315 kfree(save); 4316 } 4317 4318 if (err) { 4319 ext4_msg(sb, KERN_ERR, "error loading journal"); 4320 jbd2_journal_destroy(journal); 4321 return err; 4322 } 4323 4324 EXT4_SB(sb)->s_journal = journal; 4325 ext4_clear_journal_err(sb, es); 4326 4327 if (!really_read_only && journal_devnum && 4328 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4329 es->s_journal_dev = cpu_to_le32(journal_devnum); 4330 4331 /* Make sure we flush the recovery flag to disk. */ 4332 ext4_commit_super(sb, 1); 4333 } 4334 4335 return 0; 4336 } 4337 4338 static int ext4_commit_super(struct super_block *sb, int sync) 4339 { 4340 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4341 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4342 int error = 0; 4343 4344 if (!sbh || block_device_ejected(sb)) 4345 return error; 4346 if (buffer_write_io_error(sbh)) { 4347 /* 4348 * Oh, dear. A previous attempt to write the 4349 * superblock failed. This could happen because the 4350 * USB device was yanked out. Or it could happen to 4351 * be a transient write error and maybe the block will 4352 * be remapped. Nothing we can do but to retry the 4353 * write and hope for the best. 4354 */ 4355 ext4_msg(sb, KERN_ERR, "previous I/O error to " 4356 "superblock detected"); 4357 clear_buffer_write_io_error(sbh); 4358 set_buffer_uptodate(sbh); 4359 } 4360 /* 4361 * If the file system is mounted read-only, don't update the 4362 * superblock write time. This avoids updating the superblock 4363 * write time when we are mounting the root file system 4364 * read/only but we need to replay the journal; at that point, 4365 * for people who are east of GMT and who make their clock 4366 * tick in localtime for Windows bug-for-bug compatibility, 4367 * the clock is set in the future, and this will cause e2fsck 4368 * to complain and force a full file system check. 4369 */ 4370 if (!(sb->s_flags & MS_RDONLY)) 4371 es->s_wtime = cpu_to_le32(get_seconds()); 4372 if (sb->s_bdev->bd_part) 4373 es->s_kbytes_written = 4374 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4375 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4376 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4377 else 4378 es->s_kbytes_written = 4379 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 4380 ext4_free_blocks_count_set(es, 4381 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( 4382 &EXT4_SB(sb)->s_freeclusters_counter))); 4383 es->s_free_inodes_count = 4384 cpu_to_le32(percpu_counter_sum_positive( 4385 &EXT4_SB(sb)->s_freeinodes_counter)); 4386 BUFFER_TRACE(sbh, "marking dirty"); 4387 ext4_superblock_csum_set(sb); 4388 mark_buffer_dirty(sbh); 4389 if (sync) { 4390 error = sync_dirty_buffer(sbh); 4391 if (error) 4392 return error; 4393 4394 error = buffer_write_io_error(sbh); 4395 if (error) { 4396 ext4_msg(sb, KERN_ERR, "I/O error while writing " 4397 "superblock"); 4398 clear_buffer_write_io_error(sbh); 4399 set_buffer_uptodate(sbh); 4400 } 4401 } 4402 return error; 4403 } 4404 4405 /* 4406 * Have we just finished recovery? If so, and if we are mounting (or 4407 * remounting) the filesystem readonly, then we will end up with a 4408 * consistent fs on disk. Record that fact. 4409 */ 4410 static void ext4_mark_recovery_complete(struct super_block *sb, 4411 struct ext4_super_block *es) 4412 { 4413 journal_t *journal = EXT4_SB(sb)->s_journal; 4414 4415 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 4416 BUG_ON(journal != NULL); 4417 return; 4418 } 4419 jbd2_journal_lock_updates(journal); 4420 if (jbd2_journal_flush(journal) < 0) 4421 goto out; 4422 4423 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 4424 sb->s_flags & MS_RDONLY) { 4425 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4426 ext4_commit_super(sb, 1); 4427 } 4428 4429 out: 4430 jbd2_journal_unlock_updates(journal); 4431 } 4432 4433 /* 4434 * If we are mounting (or read-write remounting) a filesystem whose journal 4435 * has recorded an error from a previous lifetime, move that error to the 4436 * main filesystem now. 4437 */ 4438 static void ext4_clear_journal_err(struct super_block *sb, 4439 struct ext4_super_block *es) 4440 { 4441 journal_t *journal; 4442 int j_errno; 4443 const char *errstr; 4444 4445 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4446 4447 journal = EXT4_SB(sb)->s_journal; 4448 4449 /* 4450 * Now check for any error status which may have been recorded in the 4451 * journal by a prior ext4_error() or ext4_abort() 4452 */ 4453 4454 j_errno = jbd2_journal_errno(journal); 4455 if (j_errno) { 4456 char nbuf[16]; 4457 4458 errstr = ext4_decode_error(sb, j_errno, nbuf); 4459 ext4_warning(sb, "Filesystem error recorded " 4460 "from previous mount: %s", errstr); 4461 ext4_warning(sb, "Marking fs in need of filesystem check."); 4462 4463 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4464 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4465 ext4_commit_super(sb, 1); 4466 4467 jbd2_journal_clear_err(journal); 4468 jbd2_journal_update_sb_errno(journal); 4469 } 4470 } 4471 4472 /* 4473 * Force the running and committing transactions to commit, 4474 * and wait on the commit. 4475 */ 4476 int ext4_force_commit(struct super_block *sb) 4477 { 4478 journal_t *journal; 4479 int ret = 0; 4480 4481 if (sb->s_flags & MS_RDONLY) 4482 return 0; 4483 4484 journal = EXT4_SB(sb)->s_journal; 4485 if (journal) 4486 ret = ext4_journal_force_commit(journal); 4487 4488 return ret; 4489 } 4490 4491 static int ext4_sync_fs(struct super_block *sb, int wait) 4492 { 4493 int ret = 0; 4494 tid_t target; 4495 struct ext4_sb_info *sbi = EXT4_SB(sb); 4496 4497 trace_ext4_sync_fs(sb, wait); 4498 flush_workqueue(sbi->dio_unwritten_wq); 4499 /* 4500 * Writeback quota in non-journalled quota case - journalled quota has 4501 * no dirty dquots 4502 */ 4503 dquot_writeback_dquots(sb, -1); 4504 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4505 if (wait) 4506 jbd2_log_wait_commit(sbi->s_journal, target); 4507 } 4508 return ret; 4509 } 4510 4511 /* 4512 * LVM calls this function before a (read-only) snapshot is created. This 4513 * gives us a chance to flush the journal completely and mark the fs clean. 4514 * 4515 * Note that only this function cannot bring a filesystem to be in a clean 4516 * state independently. It relies on upper layer to stop all data & metadata 4517 * modifications. 4518 */ 4519 static int ext4_freeze(struct super_block *sb) 4520 { 4521 int error = 0; 4522 journal_t *journal; 4523 4524 if (sb->s_flags & MS_RDONLY) 4525 return 0; 4526 4527 journal = EXT4_SB(sb)->s_journal; 4528 4529 /* Now we set up the journal barrier. */ 4530 jbd2_journal_lock_updates(journal); 4531 4532 /* 4533 * Don't clear the needs_recovery flag if we failed to flush 4534 * the journal. 4535 */ 4536 error = jbd2_journal_flush(journal); 4537 if (error < 0) 4538 goto out; 4539 4540 /* Journal blocked and flushed, clear needs_recovery flag. */ 4541 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4542 error = ext4_commit_super(sb, 1); 4543 out: 4544 /* we rely on upper layer to stop further updates */ 4545 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4546 return error; 4547 } 4548 4549 /* 4550 * Called by LVM after the snapshot is done. We need to reset the RECOVER 4551 * flag here, even though the filesystem is not technically dirty yet. 4552 */ 4553 static int ext4_unfreeze(struct super_block *sb) 4554 { 4555 if (sb->s_flags & MS_RDONLY) 4556 return 0; 4557 4558 /* Reset the needs_recovery flag before the fs is unlocked. */ 4559 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4560 ext4_commit_super(sb, 1); 4561 return 0; 4562 } 4563 4564 /* 4565 * Structure to save mount options for ext4_remount's benefit 4566 */ 4567 struct ext4_mount_options { 4568 unsigned long s_mount_opt; 4569 unsigned long s_mount_opt2; 4570 kuid_t s_resuid; 4571 kgid_t s_resgid; 4572 unsigned long s_commit_interval; 4573 u32 s_min_batch_time, s_max_batch_time; 4574 #ifdef CONFIG_QUOTA 4575 int s_jquota_fmt; 4576 char *s_qf_names[MAXQUOTAS]; 4577 #endif 4578 }; 4579 4580 static int ext4_remount(struct super_block *sb, int *flags, char *data) 4581 { 4582 struct ext4_super_block *es; 4583 struct ext4_sb_info *sbi = EXT4_SB(sb); 4584 unsigned long old_sb_flags; 4585 struct ext4_mount_options old_opts; 4586 int enable_quota = 0; 4587 ext4_group_t g; 4588 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4589 int err = 0; 4590 #ifdef CONFIG_QUOTA 4591 int i; 4592 #endif 4593 char *orig_data = kstrdup(data, GFP_KERNEL); 4594 4595 /* Store the original options */ 4596 old_sb_flags = sb->s_flags; 4597 old_opts.s_mount_opt = sbi->s_mount_opt; 4598 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4599 old_opts.s_resuid = sbi->s_resuid; 4600 old_opts.s_resgid = sbi->s_resgid; 4601 old_opts.s_commit_interval = sbi->s_commit_interval; 4602 old_opts.s_min_batch_time = sbi->s_min_batch_time; 4603 old_opts.s_max_batch_time = sbi->s_max_batch_time; 4604 #ifdef CONFIG_QUOTA 4605 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4606 for (i = 0; i < MAXQUOTAS; i++) 4607 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 4608 #endif 4609 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4610 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4611 4612 /* 4613 * Allow the "check" option to be passed as a remount option. 4614 */ 4615 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { 4616 err = -EINVAL; 4617 goto restore_opts; 4618 } 4619 4620 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 4621 ext4_abort(sb, "Abort forced by user"); 4622 4623 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 4624 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 4625 4626 es = sbi->s_es; 4627 4628 if (sbi->s_journal) { 4629 ext4_init_journal_params(sb, sbi->s_journal); 4630 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4631 } 4632 4633 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { 4634 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 4635 err = -EROFS; 4636 goto restore_opts; 4637 } 4638 4639 if (*flags & MS_RDONLY) { 4640 err = dquot_suspend(sb, -1); 4641 if (err < 0) 4642 goto restore_opts; 4643 4644 /* 4645 * First of all, the unconditional stuff we have to do 4646 * to disable replay of the journal when we next remount 4647 */ 4648 sb->s_flags |= MS_RDONLY; 4649 4650 /* 4651 * OK, test if we are remounting a valid rw partition 4652 * readonly, and if so set the rdonly flag and then 4653 * mark the partition as valid again. 4654 */ 4655 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 4656 (sbi->s_mount_state & EXT4_VALID_FS)) 4657 es->s_state = cpu_to_le16(sbi->s_mount_state); 4658 4659 if (sbi->s_journal) 4660 ext4_mark_recovery_complete(sb, es); 4661 } else { 4662 /* Make sure we can mount this feature set readwrite */ 4663 if (!ext4_feature_set_ok(sb, 0)) { 4664 err = -EROFS; 4665 goto restore_opts; 4666 } 4667 /* 4668 * Make sure the group descriptor checksums 4669 * are sane. If they aren't, refuse to remount r/w. 4670 */ 4671 for (g = 0; g < sbi->s_groups_count; g++) { 4672 struct ext4_group_desc *gdp = 4673 ext4_get_group_desc(sb, g, NULL); 4674 4675 if (!ext4_group_desc_csum_verify(sb, g, gdp)) { 4676 ext4_msg(sb, KERN_ERR, 4677 "ext4_remount: Checksum for group %u failed (%u!=%u)", 4678 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 4679 le16_to_cpu(gdp->bg_checksum)); 4680 err = -EINVAL; 4681 goto restore_opts; 4682 } 4683 } 4684 4685 /* 4686 * If we have an unprocessed orphan list hanging 4687 * around from a previously readonly bdev mount, 4688 * require a full umount/remount for now. 4689 */ 4690 if (es->s_last_orphan) { 4691 ext4_msg(sb, KERN_WARNING, "Couldn't " 4692 "remount RDWR because of unprocessed " 4693 "orphan inode list. Please " 4694 "umount/remount instead"); 4695 err = -EINVAL; 4696 goto restore_opts; 4697 } 4698 4699 /* 4700 * Mounting a RDONLY partition read-write, so reread 4701 * and store the current valid flag. (It may have 4702 * been changed by e2fsck since we originally mounted 4703 * the partition.) 4704 */ 4705 if (sbi->s_journal) 4706 ext4_clear_journal_err(sb, es); 4707 sbi->s_mount_state = le16_to_cpu(es->s_state); 4708 if (!ext4_setup_super(sb, es, 0)) 4709 sb->s_flags &= ~MS_RDONLY; 4710 if (EXT4_HAS_INCOMPAT_FEATURE(sb, 4711 EXT4_FEATURE_INCOMPAT_MMP)) 4712 if (ext4_multi_mount_protect(sb, 4713 le64_to_cpu(es->s_mmp_block))) { 4714 err = -EROFS; 4715 goto restore_opts; 4716 } 4717 enable_quota = 1; 4718 } 4719 } 4720 4721 /* 4722 * Reinitialize lazy itable initialization thread based on 4723 * current settings 4724 */ 4725 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 4726 ext4_unregister_li_request(sb); 4727 else { 4728 ext4_group_t first_not_zeroed; 4729 first_not_zeroed = ext4_has_uninit_itable(sb); 4730 ext4_register_li_request(sb, first_not_zeroed); 4731 } 4732 4733 ext4_setup_system_zone(sb); 4734 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) 4735 ext4_commit_super(sb, 1); 4736 4737 #ifdef CONFIG_QUOTA 4738 /* Release old quota file names */ 4739 for (i = 0; i < MAXQUOTAS; i++) 4740 if (old_opts.s_qf_names[i] && 4741 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 4742 kfree(old_opts.s_qf_names[i]); 4743 if (enable_quota) { 4744 if (sb_any_quota_suspended(sb)) 4745 dquot_resume(sb, -1); 4746 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 4747 EXT4_FEATURE_RO_COMPAT_QUOTA)) { 4748 err = ext4_enable_quotas(sb); 4749 if (err) 4750 goto restore_opts; 4751 } 4752 } 4753 #endif 4754 4755 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 4756 kfree(orig_data); 4757 return 0; 4758 4759 restore_opts: 4760 sb->s_flags = old_sb_flags; 4761 sbi->s_mount_opt = old_opts.s_mount_opt; 4762 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 4763 sbi->s_resuid = old_opts.s_resuid; 4764 sbi->s_resgid = old_opts.s_resgid; 4765 sbi->s_commit_interval = old_opts.s_commit_interval; 4766 sbi->s_min_batch_time = old_opts.s_min_batch_time; 4767 sbi->s_max_batch_time = old_opts.s_max_batch_time; 4768 #ifdef CONFIG_QUOTA 4769 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 4770 for (i = 0; i < MAXQUOTAS; i++) { 4771 if (sbi->s_qf_names[i] && 4772 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 4773 kfree(sbi->s_qf_names[i]); 4774 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 4775 } 4776 #endif 4777 kfree(orig_data); 4778 return err; 4779 } 4780 4781 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 4782 { 4783 struct super_block *sb = dentry->d_sb; 4784 struct ext4_sb_info *sbi = EXT4_SB(sb); 4785 struct ext4_super_block *es = sbi->s_es; 4786 ext4_fsblk_t overhead = 0; 4787 u64 fsid; 4788 s64 bfree; 4789 4790 if (!test_opt(sb, MINIX_DF)) 4791 overhead = sbi->s_overhead; 4792 4793 buf->f_type = EXT4_SUPER_MAGIC; 4794 buf->f_bsize = sb->s_blocksize; 4795 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); 4796 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 4797 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 4798 /* prevent underflow in case that few free space is available */ 4799 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 4800 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 4801 if (buf->f_bfree < ext4_r_blocks_count(es)) 4802 buf->f_bavail = 0; 4803 buf->f_files = le32_to_cpu(es->s_inodes_count); 4804 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 4805 buf->f_namelen = EXT4_NAME_LEN; 4806 fsid = le64_to_cpup((void *)es->s_uuid) ^ 4807 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 4808 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 4809 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 4810 4811 return 0; 4812 } 4813 4814 /* Helper function for writing quotas on sync - we need to start transaction 4815 * before quota file is locked for write. Otherwise the are possible deadlocks: 4816 * Process 1 Process 2 4817 * ext4_create() quota_sync() 4818 * jbd2_journal_start() write_dquot() 4819 * dquot_initialize() down(dqio_mutex) 4820 * down(dqio_mutex) jbd2_journal_start() 4821 * 4822 */ 4823 4824 #ifdef CONFIG_QUOTA 4825 4826 static inline struct inode *dquot_to_inode(struct dquot *dquot) 4827 { 4828 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 4829 } 4830 4831 static int ext4_write_dquot(struct dquot *dquot) 4832 { 4833 int ret, err; 4834 handle_t *handle; 4835 struct inode *inode; 4836 4837 inode = dquot_to_inode(dquot); 4838 handle = ext4_journal_start(inode, 4839 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 4840 if (IS_ERR(handle)) 4841 return PTR_ERR(handle); 4842 ret = dquot_commit(dquot); 4843 err = ext4_journal_stop(handle); 4844 if (!ret) 4845 ret = err; 4846 return ret; 4847 } 4848 4849 static int ext4_acquire_dquot(struct dquot *dquot) 4850 { 4851 int ret, err; 4852 handle_t *handle; 4853 4854 handle = ext4_journal_start(dquot_to_inode(dquot), 4855 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 4856 if (IS_ERR(handle)) 4857 return PTR_ERR(handle); 4858 ret = dquot_acquire(dquot); 4859 err = ext4_journal_stop(handle); 4860 if (!ret) 4861 ret = err; 4862 return ret; 4863 } 4864 4865 static int ext4_release_dquot(struct dquot *dquot) 4866 { 4867 int ret, err; 4868 handle_t *handle; 4869 4870 handle = ext4_journal_start(dquot_to_inode(dquot), 4871 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 4872 if (IS_ERR(handle)) { 4873 /* Release dquot anyway to avoid endless cycle in dqput() */ 4874 dquot_release(dquot); 4875 return PTR_ERR(handle); 4876 } 4877 ret = dquot_release(dquot); 4878 err = ext4_journal_stop(handle); 4879 if (!ret) 4880 ret = err; 4881 return ret; 4882 } 4883 4884 static int ext4_mark_dquot_dirty(struct dquot *dquot) 4885 { 4886 /* Are we journaling quotas? */ 4887 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 4888 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 4889 dquot_mark_dquot_dirty(dquot); 4890 return ext4_write_dquot(dquot); 4891 } else { 4892 return dquot_mark_dquot_dirty(dquot); 4893 } 4894 } 4895 4896 static int ext4_write_info(struct super_block *sb, int type) 4897 { 4898 int ret, err; 4899 handle_t *handle; 4900 4901 /* Data block + inode block */ 4902 handle = ext4_journal_start(sb->s_root->d_inode, 2); 4903 if (IS_ERR(handle)) 4904 return PTR_ERR(handle); 4905 ret = dquot_commit_info(sb, type); 4906 err = ext4_journal_stop(handle); 4907 if (!ret) 4908 ret = err; 4909 return ret; 4910 } 4911 4912 /* 4913 * Turn on quotas during mount time - we need to find 4914 * the quota file and such... 4915 */ 4916 static int ext4_quota_on_mount(struct super_block *sb, int type) 4917 { 4918 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 4919 EXT4_SB(sb)->s_jquota_fmt, type); 4920 } 4921 4922 /* 4923 * Standard function to be called on quota_on 4924 */ 4925 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 4926 struct path *path) 4927 { 4928 int err; 4929 4930 if (!test_opt(sb, QUOTA)) 4931 return -EINVAL; 4932 4933 /* Quotafile not on the same filesystem? */ 4934 if (path->dentry->d_sb != sb) 4935 return -EXDEV; 4936 /* Journaling quota? */ 4937 if (EXT4_SB(sb)->s_qf_names[type]) { 4938 /* Quotafile not in fs root? */ 4939 if (path->dentry->d_parent != sb->s_root) 4940 ext4_msg(sb, KERN_WARNING, 4941 "Quota file not on filesystem root. " 4942 "Journaled quota will not work"); 4943 } 4944 4945 /* 4946 * When we journal data on quota file, we have to flush journal to see 4947 * all updates to the file when we bypass pagecache... 4948 */ 4949 if (EXT4_SB(sb)->s_journal && 4950 ext4_should_journal_data(path->dentry->d_inode)) { 4951 /* 4952 * We don't need to lock updates but journal_flush() could 4953 * otherwise be livelocked... 4954 */ 4955 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 4956 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 4957 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4958 if (err) 4959 return err; 4960 } 4961 4962 return dquot_quota_on(sb, type, format_id, path); 4963 } 4964 4965 static int ext4_quota_enable(struct super_block *sb, int type, int format_id, 4966 unsigned int flags) 4967 { 4968 int err; 4969 struct inode *qf_inode; 4970 unsigned long qf_inums[MAXQUOTAS] = { 4971 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 4972 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum) 4973 }; 4974 4975 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)); 4976 4977 if (!qf_inums[type]) 4978 return -EPERM; 4979 4980 qf_inode = ext4_iget(sb, qf_inums[type]); 4981 if (IS_ERR(qf_inode)) { 4982 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); 4983 return PTR_ERR(qf_inode); 4984 } 4985 4986 err = dquot_enable(qf_inode, type, format_id, flags); 4987 iput(qf_inode); 4988 4989 return err; 4990 } 4991 4992 /* Enable usage tracking for all quota types. */ 4993 static int ext4_enable_quotas(struct super_block *sb) 4994 { 4995 int type, err = 0; 4996 unsigned long qf_inums[MAXQUOTAS] = { 4997 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), 4998 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum) 4999 }; 5000 5001 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 5002 for (type = 0; type < MAXQUOTAS; type++) { 5003 if (qf_inums[type]) { 5004 err = ext4_quota_enable(sb, type, QFMT_VFS_V1, 5005 DQUOT_USAGE_ENABLED); 5006 if (err) { 5007 ext4_warning(sb, 5008 "Failed to enable quota (type=%d) " 5009 "tracking. Please run e2fsck to fix.", 5010 type); 5011 return err; 5012 } 5013 } 5014 } 5015 return 0; 5016 } 5017 5018 /* 5019 * quota_on function that is used when QUOTA feature is set. 5020 */ 5021 static int ext4_quota_on_sysfile(struct super_block *sb, int type, 5022 int format_id) 5023 { 5024 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) 5025 return -EINVAL; 5026 5027 /* 5028 * USAGE was enabled at mount time. Only need to enable LIMITS now. 5029 */ 5030 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED); 5031 } 5032 5033 static int ext4_quota_off(struct super_block *sb, int type) 5034 { 5035 struct inode *inode = sb_dqopt(sb)->files[type]; 5036 handle_t *handle; 5037 5038 /* Force all delayed allocation blocks to be allocated. 5039 * Caller already holds s_umount sem */ 5040 if (test_opt(sb, DELALLOC)) 5041 sync_filesystem(sb); 5042 5043 if (!inode) 5044 goto out; 5045 5046 /* Update modification times of quota files when userspace can 5047 * start looking at them */ 5048 handle = ext4_journal_start(inode, 1); 5049 if (IS_ERR(handle)) 5050 goto out; 5051 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5052 ext4_mark_inode_dirty(handle, inode); 5053 ext4_journal_stop(handle); 5054 5055 out: 5056 return dquot_quota_off(sb, type); 5057 } 5058 5059 /* 5060 * quota_off function that is used when QUOTA feature is set. 5061 */ 5062 static int ext4_quota_off_sysfile(struct super_block *sb, int type) 5063 { 5064 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) 5065 return -EINVAL; 5066 5067 /* Disable only the limits. */ 5068 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 5069 } 5070 5071 /* Read data from quotafile - avoid pagecache and such because we cannot afford 5072 * acquiring the locks... As quota files are never truncated and quota code 5073 * itself serializes the operations (and no one else should touch the files) 5074 * we don't have to be afraid of races */ 5075 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 5076 size_t len, loff_t off) 5077 { 5078 struct inode *inode = sb_dqopt(sb)->files[type]; 5079 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5080 int err = 0; 5081 int offset = off & (sb->s_blocksize - 1); 5082 int tocopy; 5083 size_t toread; 5084 struct buffer_head *bh; 5085 loff_t i_size = i_size_read(inode); 5086 5087 if (off > i_size) 5088 return 0; 5089 if (off+len > i_size) 5090 len = i_size-off; 5091 toread = len; 5092 while (toread > 0) { 5093 tocopy = sb->s_blocksize - offset < toread ? 5094 sb->s_blocksize - offset : toread; 5095 bh = ext4_bread(NULL, inode, blk, 0, &err); 5096 if (err) 5097 return err; 5098 if (!bh) /* A hole? */ 5099 memset(data, 0, tocopy); 5100 else 5101 memcpy(data, bh->b_data+offset, tocopy); 5102 brelse(bh); 5103 offset = 0; 5104 toread -= tocopy; 5105 data += tocopy; 5106 blk++; 5107 } 5108 return len; 5109 } 5110 5111 /* Write to quotafile (we know the transaction is already started and has 5112 * enough credits) */ 5113 static ssize_t ext4_quota_write(struct super_block *sb, int type, 5114 const char *data, size_t len, loff_t off) 5115 { 5116 struct inode *inode = sb_dqopt(sb)->files[type]; 5117 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 5118 int err = 0; 5119 int offset = off & (sb->s_blocksize - 1); 5120 struct buffer_head *bh; 5121 handle_t *handle = journal_current_handle(); 5122 5123 if (EXT4_SB(sb)->s_journal && !handle) { 5124 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5125 " cancelled because transaction is not started", 5126 (unsigned long long)off, (unsigned long long)len); 5127 return -EIO; 5128 } 5129 /* 5130 * Since we account only one data block in transaction credits, 5131 * then it is impossible to cross a block boundary. 5132 */ 5133 if (sb->s_blocksize - offset < len) { 5134 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 5135 " cancelled because not block aligned", 5136 (unsigned long long)off, (unsigned long long)len); 5137 return -EIO; 5138 } 5139 5140 bh = ext4_bread(handle, inode, blk, 1, &err); 5141 if (!bh) 5142 goto out; 5143 err = ext4_journal_get_write_access(handle, bh); 5144 if (err) { 5145 brelse(bh); 5146 goto out; 5147 } 5148 lock_buffer(bh); 5149 memcpy(bh->b_data+offset, data, len); 5150 flush_dcache_page(bh->b_page); 5151 unlock_buffer(bh); 5152 err = ext4_handle_dirty_metadata(handle, NULL, bh); 5153 brelse(bh); 5154 out: 5155 if (err) 5156 return err; 5157 if (inode->i_size < off + len) { 5158 i_size_write(inode, off + len); 5159 EXT4_I(inode)->i_disksize = inode->i_size; 5160 ext4_mark_inode_dirty(handle, inode); 5161 } 5162 return len; 5163 } 5164 5165 #endif 5166 5167 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 5168 const char *dev_name, void *data) 5169 { 5170 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 5171 } 5172 5173 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 5174 static inline void register_as_ext2(void) 5175 { 5176 int err = register_filesystem(&ext2_fs_type); 5177 if (err) 5178 printk(KERN_WARNING 5179 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 5180 } 5181 5182 static inline void unregister_as_ext2(void) 5183 { 5184 unregister_filesystem(&ext2_fs_type); 5185 } 5186 5187 static inline int ext2_feature_set_ok(struct super_block *sb) 5188 { 5189 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP)) 5190 return 0; 5191 if (sb->s_flags & MS_RDONLY) 5192 return 1; 5193 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP)) 5194 return 0; 5195 return 1; 5196 } 5197 MODULE_ALIAS("ext2"); 5198 #else 5199 static inline void register_as_ext2(void) { } 5200 static inline void unregister_as_ext2(void) { } 5201 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 5202 #endif 5203 5204 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 5205 static inline void register_as_ext3(void) 5206 { 5207 int err = register_filesystem(&ext3_fs_type); 5208 if (err) 5209 printk(KERN_WARNING 5210 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 5211 } 5212 5213 static inline void unregister_as_ext3(void) 5214 { 5215 unregister_filesystem(&ext3_fs_type); 5216 } 5217 5218 static inline int ext3_feature_set_ok(struct super_block *sb) 5219 { 5220 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP)) 5221 return 0; 5222 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 5223 return 0; 5224 if (sb->s_flags & MS_RDONLY) 5225 return 1; 5226 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) 5227 return 0; 5228 return 1; 5229 } 5230 MODULE_ALIAS("ext3"); 5231 #else 5232 static inline void register_as_ext3(void) { } 5233 static inline void unregister_as_ext3(void) { } 5234 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; } 5235 #endif 5236 5237 static struct file_system_type ext4_fs_type = { 5238 .owner = THIS_MODULE, 5239 .name = "ext4", 5240 .mount = ext4_mount, 5241 .kill_sb = kill_block_super, 5242 .fs_flags = FS_REQUIRES_DEV, 5243 }; 5244 5245 static int __init ext4_init_feat_adverts(void) 5246 { 5247 struct ext4_features *ef; 5248 int ret = -ENOMEM; 5249 5250 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); 5251 if (!ef) 5252 goto out; 5253 5254 ef->f_kobj.kset = ext4_kset; 5255 init_completion(&ef->f_kobj_unregister); 5256 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, 5257 "features"); 5258 if (ret) { 5259 kfree(ef); 5260 goto out; 5261 } 5262 5263 ext4_feat = ef; 5264 ret = 0; 5265 out: 5266 return ret; 5267 } 5268 5269 static void ext4_exit_feat_adverts(void) 5270 { 5271 kobject_put(&ext4_feat->f_kobj); 5272 wait_for_completion(&ext4_feat->f_kobj_unregister); 5273 kfree(ext4_feat); 5274 } 5275 5276 /* Shared across all ext4 file systems */ 5277 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 5278 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 5279 5280 static int __init ext4_init_fs(void) 5281 { 5282 int i, err; 5283 5284 ext4_li_info = NULL; 5285 mutex_init(&ext4_li_mtx); 5286 5287 /* Build-time check for flags consistency */ 5288 ext4_check_flag_values(); 5289 5290 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) { 5291 mutex_init(&ext4__aio_mutex[i]); 5292 init_waitqueue_head(&ext4__ioend_wq[i]); 5293 } 5294 5295 err = ext4_init_es(); 5296 if (err) 5297 return err; 5298 5299 err = ext4_init_pageio(); 5300 if (err) 5301 goto out7; 5302 5303 err = ext4_init_system_zone(); 5304 if (err) 5305 goto out6; 5306 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 5307 if (!ext4_kset) { 5308 err = -ENOMEM; 5309 goto out5; 5310 } 5311 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 5312 5313 err = ext4_init_feat_adverts(); 5314 if (err) 5315 goto out4; 5316 5317 err = ext4_init_mballoc(); 5318 if (err) 5319 goto out3; 5320 5321 err = ext4_init_xattr(); 5322 if (err) 5323 goto out2; 5324 err = init_inodecache(); 5325 if (err) 5326 goto out1; 5327 register_as_ext3(); 5328 register_as_ext2(); 5329 err = register_filesystem(&ext4_fs_type); 5330 if (err) 5331 goto out; 5332 5333 return 0; 5334 out: 5335 unregister_as_ext2(); 5336 unregister_as_ext3(); 5337 destroy_inodecache(); 5338 out1: 5339 ext4_exit_xattr(); 5340 out2: 5341 ext4_exit_mballoc(); 5342 out3: 5343 ext4_exit_feat_adverts(); 5344 out4: 5345 if (ext4_proc_root) 5346 remove_proc_entry("fs/ext4", NULL); 5347 kset_unregister(ext4_kset); 5348 out5: 5349 ext4_exit_system_zone(); 5350 out6: 5351 ext4_exit_pageio(); 5352 out7: 5353 ext4_exit_es(); 5354 5355 return err; 5356 } 5357 5358 static void __exit ext4_exit_fs(void) 5359 { 5360 ext4_destroy_lazyinit_thread(); 5361 unregister_as_ext2(); 5362 unregister_as_ext3(); 5363 unregister_filesystem(&ext4_fs_type); 5364 destroy_inodecache(); 5365 ext4_exit_xattr(); 5366 ext4_exit_mballoc(); 5367 ext4_exit_feat_adverts(); 5368 remove_proc_entry("fs/ext4", NULL); 5369 kset_unregister(ext4_kset); 5370 ext4_exit_system_zone(); 5371 ext4_exit_pageio(); 5372 } 5373 5374 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 5375 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5376 MODULE_LICENSE("GPL"); 5377 module_init(ext4_init_fs) 5378 module_exit(ext4_exit_fs) 5379