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 <asm/uaccess.h> 42 43 #include "ext4.h" 44 #include "ext4_jbd2.h" 45 #include "xattr.h" 46 #include "acl.h" 47 #include "mballoc.h" 48 49 #define CREATE_TRACE_POINTS 50 #include <trace/events/ext4.h> 51 52 struct proc_dir_entry *ext4_proc_root; 53 static struct kset *ext4_kset; 54 55 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 56 unsigned long journal_devnum); 57 static int ext4_commit_super(struct super_block *sb, int sync); 58 static void ext4_mark_recovery_complete(struct super_block *sb, 59 struct ext4_super_block *es); 60 static void ext4_clear_journal_err(struct super_block *sb, 61 struct ext4_super_block *es); 62 static int ext4_sync_fs(struct super_block *sb, int wait); 63 static const char *ext4_decode_error(struct super_block *sb, int errno, 64 char nbuf[16]); 65 static int ext4_remount(struct super_block *sb, int *flags, char *data); 66 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 67 static int ext4_unfreeze(struct super_block *sb); 68 static void ext4_write_super(struct super_block *sb); 69 static int ext4_freeze(struct super_block *sb); 70 static int ext4_get_sb(struct file_system_type *fs_type, int flags, 71 const char *dev_name, void *data, struct vfsmount *mnt); 72 73 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 74 static struct file_system_type ext3_fs_type = { 75 .owner = THIS_MODULE, 76 .name = "ext3", 77 .get_sb = ext4_get_sb, 78 .kill_sb = kill_block_super, 79 .fs_flags = FS_REQUIRES_DEV, 80 }; 81 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 82 #else 83 #define IS_EXT3_SB(sb) (0) 84 #endif 85 86 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 87 struct ext4_group_desc *bg) 88 { 89 return le32_to_cpu(bg->bg_block_bitmap_lo) | 90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 91 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 92 } 93 94 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 95 struct ext4_group_desc *bg) 96 { 97 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 98 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 99 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 100 } 101 102 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 103 struct ext4_group_desc *bg) 104 { 105 return le32_to_cpu(bg->bg_inode_table_lo) | 106 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 107 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 108 } 109 110 __u32 ext4_free_blks_count(struct super_block *sb, 111 struct ext4_group_desc *bg) 112 { 113 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 114 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 115 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 116 } 117 118 __u32 ext4_free_inodes_count(struct super_block *sb, 119 struct ext4_group_desc *bg) 120 { 121 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 122 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 123 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 124 } 125 126 __u32 ext4_used_dirs_count(struct super_block *sb, 127 struct ext4_group_desc *bg) 128 { 129 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 130 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 131 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 132 } 133 134 __u32 ext4_itable_unused_count(struct super_block *sb, 135 struct ext4_group_desc *bg) 136 { 137 return le16_to_cpu(bg->bg_itable_unused_lo) | 138 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 139 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 140 } 141 142 void ext4_block_bitmap_set(struct super_block *sb, 143 struct ext4_group_desc *bg, ext4_fsblk_t blk) 144 { 145 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 146 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 147 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 148 } 149 150 void ext4_inode_bitmap_set(struct super_block *sb, 151 struct ext4_group_desc *bg, ext4_fsblk_t blk) 152 { 153 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 154 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 155 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 156 } 157 158 void ext4_inode_table_set(struct super_block *sb, 159 struct ext4_group_desc *bg, ext4_fsblk_t blk) 160 { 161 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 162 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 163 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 164 } 165 166 void ext4_free_blks_set(struct super_block *sb, 167 struct ext4_group_desc *bg, __u32 count) 168 { 169 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 170 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 171 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 172 } 173 174 void ext4_free_inodes_set(struct super_block *sb, 175 struct ext4_group_desc *bg, __u32 count) 176 { 177 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 178 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 179 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 180 } 181 182 void ext4_used_dirs_set(struct super_block *sb, 183 struct ext4_group_desc *bg, __u32 count) 184 { 185 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 186 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 187 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 188 } 189 190 void ext4_itable_unused_set(struct super_block *sb, 191 struct ext4_group_desc *bg, __u32 count) 192 { 193 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 194 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 195 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 196 } 197 198 199 /* Just increment the non-pointer handle value */ 200 static handle_t *ext4_get_nojournal(void) 201 { 202 handle_t *handle = current->journal_info; 203 unsigned long ref_cnt = (unsigned long)handle; 204 205 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); 206 207 ref_cnt++; 208 handle = (handle_t *)ref_cnt; 209 210 current->journal_info = handle; 211 return handle; 212 } 213 214 215 /* Decrement the non-pointer handle value */ 216 static void ext4_put_nojournal(handle_t *handle) 217 { 218 unsigned long ref_cnt = (unsigned long)handle; 219 220 BUG_ON(ref_cnt == 0); 221 222 ref_cnt--; 223 handle = (handle_t *)ref_cnt; 224 225 current->journal_info = handle; 226 } 227 228 /* 229 * Wrappers for jbd2_journal_start/end. 230 * 231 * The only special thing we need to do here is to make sure that all 232 * journal_end calls result in the superblock being marked dirty, so 233 * that sync() will call the filesystem's write_super callback if 234 * appropriate. 235 */ 236 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 237 { 238 journal_t *journal; 239 240 if (sb->s_flags & MS_RDONLY) 241 return ERR_PTR(-EROFS); 242 243 vfs_check_frozen(sb, SB_FREEZE_TRANS); 244 /* Special case here: if the journal has aborted behind our 245 * backs (eg. EIO in the commit thread), then we still need to 246 * take the FS itself readonly cleanly. */ 247 journal = EXT4_SB(sb)->s_journal; 248 if (journal) { 249 if (is_journal_aborted(journal)) { 250 ext4_abort(sb, "Detected aborted journal"); 251 return ERR_PTR(-EROFS); 252 } 253 return jbd2_journal_start(journal, nblocks); 254 } 255 return ext4_get_nojournal(); 256 } 257 258 /* 259 * The only special thing we need to do here is to make sure that all 260 * jbd2_journal_stop calls result in the superblock being marked dirty, so 261 * that sync() will call the filesystem's write_super callback if 262 * appropriate. 263 */ 264 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) 265 { 266 struct super_block *sb; 267 int err; 268 int rc; 269 270 if (!ext4_handle_valid(handle)) { 271 ext4_put_nojournal(handle); 272 return 0; 273 } 274 sb = handle->h_transaction->t_journal->j_private; 275 err = handle->h_err; 276 rc = jbd2_journal_stop(handle); 277 278 if (!err) 279 err = rc; 280 if (err) 281 __ext4_std_error(sb, where, line, err); 282 return err; 283 } 284 285 void ext4_journal_abort_handle(const char *caller, unsigned int line, 286 const char *err_fn, struct buffer_head *bh, 287 handle_t *handle, int err) 288 { 289 char nbuf[16]; 290 const char *errstr = ext4_decode_error(NULL, err, nbuf); 291 292 BUG_ON(!ext4_handle_valid(handle)); 293 294 if (bh) 295 BUFFER_TRACE(bh, "abort"); 296 297 if (!handle->h_err) 298 handle->h_err = err; 299 300 if (is_handle_aborted(handle)) 301 return; 302 303 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n", 304 caller, line, errstr, err_fn); 305 306 jbd2_journal_abort_handle(handle); 307 } 308 309 static void __save_error_info(struct super_block *sb, const char *func, 310 unsigned int line) 311 { 312 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 313 314 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 315 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 316 es->s_last_error_time = cpu_to_le32(get_seconds()); 317 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 318 es->s_last_error_line = cpu_to_le32(line); 319 if (!es->s_first_error_time) { 320 es->s_first_error_time = es->s_last_error_time; 321 strncpy(es->s_first_error_func, func, 322 sizeof(es->s_first_error_func)); 323 es->s_first_error_line = cpu_to_le32(line); 324 es->s_first_error_ino = es->s_last_error_ino; 325 es->s_first_error_block = es->s_last_error_block; 326 } 327 /* 328 * Start the daily error reporting function if it hasn't been 329 * started already 330 */ 331 if (!es->s_error_count) 332 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 333 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); 334 } 335 336 static void save_error_info(struct super_block *sb, const char *func, 337 unsigned int line) 338 { 339 __save_error_info(sb, func, line); 340 ext4_commit_super(sb, 1); 341 } 342 343 344 /* Deal with the reporting of failure conditions on a filesystem such as 345 * inconsistencies detected or read IO failures. 346 * 347 * On ext2, we can store the error state of the filesystem in the 348 * superblock. That is not possible on ext4, because we may have other 349 * write ordering constraints on the superblock which prevent us from 350 * writing it out straight away; and given that the journal is about to 351 * be aborted, we can't rely on the current, or future, transactions to 352 * write out the superblock safely. 353 * 354 * We'll just use the jbd2_journal_abort() error code to record an error in 355 * the journal instead. On recovery, the journal will complain about 356 * that error until we've noted it down and cleared it. 357 */ 358 359 static void ext4_handle_error(struct super_block *sb) 360 { 361 if (sb->s_flags & MS_RDONLY) 362 return; 363 364 if (!test_opt(sb, ERRORS_CONT)) { 365 journal_t *journal = EXT4_SB(sb)->s_journal; 366 367 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 368 if (journal) 369 jbd2_journal_abort(journal, -EIO); 370 } 371 if (test_opt(sb, ERRORS_RO)) { 372 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 373 sb->s_flags |= MS_RDONLY; 374 } 375 if (test_opt(sb, ERRORS_PANIC)) 376 panic("EXT4-fs (device %s): panic forced after error\n", 377 sb->s_id); 378 } 379 380 void __ext4_error(struct super_block *sb, const char *function, 381 unsigned int line, const char *fmt, ...) 382 { 383 va_list args; 384 385 va_start(args, fmt); 386 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ", 387 sb->s_id, function, line, current->comm); 388 vprintk(fmt, args); 389 printk("\n"); 390 va_end(args); 391 392 ext4_handle_error(sb); 393 } 394 395 void ext4_error_inode(struct inode *inode, const char *function, 396 unsigned int line, ext4_fsblk_t block, 397 const char *fmt, ...) 398 { 399 va_list args; 400 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 401 402 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 403 es->s_last_error_block = cpu_to_le64(block); 404 save_error_info(inode->i_sb, function, line); 405 va_start(args, fmt); 406 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ", 407 inode->i_sb->s_id, function, line, inode->i_ino); 408 if (block) 409 printk("block %llu: ", block); 410 printk("comm %s: ", current->comm); 411 vprintk(fmt, args); 412 printk("\n"); 413 va_end(args); 414 415 ext4_handle_error(inode->i_sb); 416 } 417 418 void ext4_error_file(struct file *file, const char *function, 419 unsigned int line, const char *fmt, ...) 420 { 421 va_list args; 422 struct ext4_super_block *es; 423 struct inode *inode = file->f_dentry->d_inode; 424 char pathname[80], *path; 425 426 es = EXT4_SB(inode->i_sb)->s_es; 427 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 428 save_error_info(inode->i_sb, function, line); 429 va_start(args, fmt); 430 path = d_path(&(file->f_path), pathname, sizeof(pathname)); 431 if (!path) 432 path = "(unknown)"; 433 printk(KERN_CRIT 434 "EXT4-fs error (device %s): %s:%d: inode #%lu " 435 "(comm %s path %s): ", 436 inode->i_sb->s_id, function, line, inode->i_ino, 437 current->comm, path); 438 vprintk(fmt, args); 439 printk("\n"); 440 va_end(args); 441 442 ext4_handle_error(inode->i_sb); 443 } 444 445 static const char *ext4_decode_error(struct super_block *sb, int errno, 446 char nbuf[16]) 447 { 448 char *errstr = NULL; 449 450 switch (errno) { 451 case -EIO: 452 errstr = "IO failure"; 453 break; 454 case -ENOMEM: 455 errstr = "Out of memory"; 456 break; 457 case -EROFS: 458 if (!sb || (EXT4_SB(sb)->s_journal && 459 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 460 errstr = "Journal has aborted"; 461 else 462 errstr = "Readonly filesystem"; 463 break; 464 default: 465 /* If the caller passed in an extra buffer for unknown 466 * errors, textualise them now. Else we just return 467 * NULL. */ 468 if (nbuf) { 469 /* Check for truncated error codes... */ 470 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 471 errstr = nbuf; 472 } 473 break; 474 } 475 476 return errstr; 477 } 478 479 /* __ext4_std_error decodes expected errors from journaling functions 480 * automatically and invokes the appropriate error response. */ 481 482 void __ext4_std_error(struct super_block *sb, const char *function, 483 unsigned int line, int errno) 484 { 485 char nbuf[16]; 486 const char *errstr; 487 488 /* Special case: if the error is EROFS, and we're not already 489 * inside a transaction, then there's really no point in logging 490 * an error. */ 491 if (errno == -EROFS && journal_current_handle() == NULL && 492 (sb->s_flags & MS_RDONLY)) 493 return; 494 495 errstr = ext4_decode_error(sb, errno, nbuf); 496 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 497 sb->s_id, function, line, errstr); 498 save_error_info(sb, function, line); 499 500 ext4_handle_error(sb); 501 } 502 503 /* 504 * ext4_abort is a much stronger failure handler than ext4_error. The 505 * abort function may be used to deal with unrecoverable failures such 506 * as journal IO errors or ENOMEM at a critical moment in log management. 507 * 508 * We unconditionally force the filesystem into an ABORT|READONLY state, 509 * unless the error response on the fs has been set to panic in which 510 * case we take the easy way out and panic immediately. 511 */ 512 513 void __ext4_abort(struct super_block *sb, const char *function, 514 unsigned int line, const char *fmt, ...) 515 { 516 va_list args; 517 518 save_error_info(sb, function, line); 519 va_start(args, fmt); 520 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 521 function, line); 522 vprintk(fmt, args); 523 printk("\n"); 524 va_end(args); 525 526 if ((sb->s_flags & MS_RDONLY) == 0) { 527 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 528 sb->s_flags |= MS_RDONLY; 529 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 530 if (EXT4_SB(sb)->s_journal) 531 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 532 save_error_info(sb, function, line); 533 } 534 if (test_opt(sb, ERRORS_PANIC)) 535 panic("EXT4-fs panic from previous error\n"); 536 } 537 538 void ext4_msg (struct super_block * sb, const char *prefix, 539 const char *fmt, ...) 540 { 541 va_list args; 542 543 va_start(args, fmt); 544 printk("%sEXT4-fs (%s): ", prefix, sb->s_id); 545 vprintk(fmt, args); 546 printk("\n"); 547 va_end(args); 548 } 549 550 void __ext4_warning(struct super_block *sb, const char *function, 551 unsigned int line, const char *fmt, ...) 552 { 553 va_list args; 554 555 va_start(args, fmt); 556 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ", 557 sb->s_id, function, line); 558 vprintk(fmt, args); 559 printk("\n"); 560 va_end(args); 561 } 562 563 void __ext4_grp_locked_error(const char *function, unsigned int line, 564 struct super_block *sb, ext4_group_t grp, 565 unsigned long ino, ext4_fsblk_t block, 566 const char *fmt, ...) 567 __releases(bitlock) 568 __acquires(bitlock) 569 { 570 va_list args; 571 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 572 573 es->s_last_error_ino = cpu_to_le32(ino); 574 es->s_last_error_block = cpu_to_le64(block); 575 __save_error_info(sb, function, line); 576 va_start(args, fmt); 577 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u", 578 sb->s_id, function, line, grp); 579 if (ino) 580 printk("inode %lu: ", ino); 581 if (block) 582 printk("block %llu:", (unsigned long long) block); 583 vprintk(fmt, args); 584 printk("\n"); 585 va_end(args); 586 587 if (test_opt(sb, ERRORS_CONT)) { 588 ext4_commit_super(sb, 0); 589 return; 590 } 591 592 ext4_unlock_group(sb, grp); 593 ext4_handle_error(sb); 594 /* 595 * We only get here in the ERRORS_RO case; relocking the group 596 * may be dangerous, but nothing bad will happen since the 597 * filesystem will have already been marked read/only and the 598 * journal has been aborted. We return 1 as a hint to callers 599 * who might what to use the return value from 600 * ext4_grp_locked_error() to distinguish beween the 601 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 602 * aggressively from the ext4 function in question, with a 603 * more appropriate error code. 604 */ 605 ext4_lock_group(sb, grp); 606 return; 607 } 608 609 void ext4_update_dynamic_rev(struct super_block *sb) 610 { 611 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 612 613 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 614 return; 615 616 ext4_warning(sb, 617 "updating to rev %d because of new feature flag, " 618 "running e2fsck is recommended", 619 EXT4_DYNAMIC_REV); 620 621 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 622 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 623 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 624 /* leave es->s_feature_*compat flags alone */ 625 /* es->s_uuid will be set by e2fsck if empty */ 626 627 /* 628 * The rest of the superblock fields should be zero, and if not it 629 * means they are likely already in use, so leave them alone. We 630 * can leave it up to e2fsck to clean up any inconsistencies there. 631 */ 632 } 633 634 /* 635 * Open the external journal device 636 */ 637 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 638 { 639 struct block_device *bdev; 640 char b[BDEVNAME_SIZE]; 641 642 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 643 if (IS_ERR(bdev)) 644 goto fail; 645 return bdev; 646 647 fail: 648 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 649 __bdevname(dev, b), PTR_ERR(bdev)); 650 return NULL; 651 } 652 653 /* 654 * Release the journal device 655 */ 656 static int ext4_blkdev_put(struct block_device *bdev) 657 { 658 bd_release(bdev); 659 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 660 } 661 662 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 663 { 664 struct block_device *bdev; 665 int ret = -ENODEV; 666 667 bdev = sbi->journal_bdev; 668 if (bdev) { 669 ret = ext4_blkdev_put(bdev); 670 sbi->journal_bdev = NULL; 671 } 672 return ret; 673 } 674 675 static inline struct inode *orphan_list_entry(struct list_head *l) 676 { 677 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 678 } 679 680 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 681 { 682 struct list_head *l; 683 684 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 685 le32_to_cpu(sbi->s_es->s_last_orphan)); 686 687 printk(KERN_ERR "sb_info orphan list:\n"); 688 list_for_each(l, &sbi->s_orphan) { 689 struct inode *inode = orphan_list_entry(l); 690 printk(KERN_ERR " " 691 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 692 inode->i_sb->s_id, inode->i_ino, inode, 693 inode->i_mode, inode->i_nlink, 694 NEXT_ORPHAN(inode)); 695 } 696 } 697 698 static void ext4_put_super(struct super_block *sb) 699 { 700 struct ext4_sb_info *sbi = EXT4_SB(sb); 701 struct ext4_super_block *es = sbi->s_es; 702 int i, err; 703 704 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 705 706 flush_workqueue(sbi->dio_unwritten_wq); 707 destroy_workqueue(sbi->dio_unwritten_wq); 708 709 lock_super(sb); 710 if (sb->s_dirt) 711 ext4_commit_super(sb, 1); 712 713 if (sbi->s_journal) { 714 err = jbd2_journal_destroy(sbi->s_journal); 715 sbi->s_journal = NULL; 716 if (err < 0) 717 ext4_abort(sb, "Couldn't clean up the journal"); 718 } 719 720 ext4_release_system_zone(sb); 721 ext4_mb_release(sb); 722 ext4_ext_release(sb); 723 ext4_xattr_put_super(sb); 724 725 if (!(sb->s_flags & MS_RDONLY)) { 726 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 727 es->s_state = cpu_to_le16(sbi->s_mount_state); 728 ext4_commit_super(sb, 1); 729 } 730 if (sbi->s_proc) { 731 remove_proc_entry(sb->s_id, ext4_proc_root); 732 } 733 kobject_del(&sbi->s_kobj); 734 735 for (i = 0; i < sbi->s_gdb_count; i++) 736 brelse(sbi->s_group_desc[i]); 737 kfree(sbi->s_group_desc); 738 if (is_vmalloc_addr(sbi->s_flex_groups)) 739 vfree(sbi->s_flex_groups); 740 else 741 kfree(sbi->s_flex_groups); 742 percpu_counter_destroy(&sbi->s_freeblocks_counter); 743 percpu_counter_destroy(&sbi->s_freeinodes_counter); 744 percpu_counter_destroy(&sbi->s_dirs_counter); 745 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 746 brelse(sbi->s_sbh); 747 #ifdef CONFIG_QUOTA 748 for (i = 0; i < MAXQUOTAS; i++) 749 kfree(sbi->s_qf_names[i]); 750 #endif 751 752 /* Debugging code just in case the in-memory inode orphan list 753 * isn't empty. The on-disk one can be non-empty if we've 754 * detected an error and taken the fs readonly, but the 755 * in-memory list had better be clean by this point. */ 756 if (!list_empty(&sbi->s_orphan)) 757 dump_orphan_list(sb, sbi); 758 J_ASSERT(list_empty(&sbi->s_orphan)); 759 760 invalidate_bdev(sb->s_bdev); 761 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 762 /* 763 * Invalidate the journal device's buffers. We don't want them 764 * floating about in memory - the physical journal device may 765 * hotswapped, and it breaks the `ro-after' testing code. 766 */ 767 sync_blockdev(sbi->journal_bdev); 768 invalidate_bdev(sbi->journal_bdev); 769 ext4_blkdev_remove(sbi); 770 } 771 sb->s_fs_info = NULL; 772 /* 773 * Now that we are completely done shutting down the 774 * superblock, we need to actually destroy the kobject. 775 */ 776 unlock_super(sb); 777 kobject_put(&sbi->s_kobj); 778 wait_for_completion(&sbi->s_kobj_unregister); 779 kfree(sbi->s_blockgroup_lock); 780 kfree(sbi); 781 } 782 783 static struct kmem_cache *ext4_inode_cachep; 784 785 /* 786 * Called inside transaction, so use GFP_NOFS 787 */ 788 static struct inode *ext4_alloc_inode(struct super_block *sb) 789 { 790 struct ext4_inode_info *ei; 791 792 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 793 if (!ei) 794 return NULL; 795 796 ei->vfs_inode.i_version = 1; 797 ei->vfs_inode.i_data.writeback_index = 0; 798 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 799 INIT_LIST_HEAD(&ei->i_prealloc_list); 800 spin_lock_init(&ei->i_prealloc_lock); 801 /* 802 * Note: We can be called before EXT4_SB(sb)->s_journal is set, 803 * therefore it can be null here. Don't check it, just initialize 804 * jinode. 805 */ 806 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 807 ei->i_reserved_data_blocks = 0; 808 ei->i_reserved_meta_blocks = 0; 809 ei->i_allocated_meta_blocks = 0; 810 ei->i_da_metadata_calc_len = 0; 811 ei->i_delalloc_reserved_flag = 0; 812 spin_lock_init(&(ei->i_block_reservation_lock)); 813 #ifdef CONFIG_QUOTA 814 ei->i_reserved_quota = 0; 815 #endif 816 INIT_LIST_HEAD(&ei->i_completed_io_list); 817 spin_lock_init(&ei->i_completed_io_lock); 818 ei->cur_aio_dio = NULL; 819 ei->i_sync_tid = 0; 820 ei->i_datasync_tid = 0; 821 822 return &ei->vfs_inode; 823 } 824 825 static void ext4_destroy_inode(struct inode *inode) 826 { 827 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 828 ext4_msg(inode->i_sb, KERN_ERR, 829 "Inode %lu (%p): orphan list check failed!", 830 inode->i_ino, EXT4_I(inode)); 831 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 832 EXT4_I(inode), sizeof(struct ext4_inode_info), 833 true); 834 dump_stack(); 835 } 836 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 837 } 838 839 static void init_once(void *foo) 840 { 841 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 842 843 INIT_LIST_HEAD(&ei->i_orphan); 844 #ifdef CONFIG_EXT4_FS_XATTR 845 init_rwsem(&ei->xattr_sem); 846 #endif 847 init_rwsem(&ei->i_data_sem); 848 inode_init_once(&ei->vfs_inode); 849 } 850 851 static int init_inodecache(void) 852 { 853 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 854 sizeof(struct ext4_inode_info), 855 0, (SLAB_RECLAIM_ACCOUNT| 856 SLAB_MEM_SPREAD), 857 init_once); 858 if (ext4_inode_cachep == NULL) 859 return -ENOMEM; 860 return 0; 861 } 862 863 static void destroy_inodecache(void) 864 { 865 kmem_cache_destroy(ext4_inode_cachep); 866 } 867 868 void ext4_clear_inode(struct inode *inode) 869 { 870 invalidate_inode_buffers(inode); 871 end_writeback(inode); 872 dquot_drop(inode); 873 ext4_discard_preallocations(inode); 874 if (EXT4_JOURNAL(inode)) 875 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 876 &EXT4_I(inode)->jinode); 877 } 878 879 static inline void ext4_show_quota_options(struct seq_file *seq, 880 struct super_block *sb) 881 { 882 #if defined(CONFIG_QUOTA) 883 struct ext4_sb_info *sbi = EXT4_SB(sb); 884 885 if (sbi->s_jquota_fmt) { 886 char *fmtname = ""; 887 888 switch (sbi->s_jquota_fmt) { 889 case QFMT_VFS_OLD: 890 fmtname = "vfsold"; 891 break; 892 case QFMT_VFS_V0: 893 fmtname = "vfsv0"; 894 break; 895 case QFMT_VFS_V1: 896 fmtname = "vfsv1"; 897 break; 898 } 899 seq_printf(seq, ",jqfmt=%s", fmtname); 900 } 901 902 if (sbi->s_qf_names[USRQUOTA]) 903 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 904 905 if (sbi->s_qf_names[GRPQUOTA]) 906 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 907 908 if (test_opt(sb, USRQUOTA)) 909 seq_puts(seq, ",usrquota"); 910 911 if (test_opt(sb, GRPQUOTA)) 912 seq_puts(seq, ",grpquota"); 913 #endif 914 } 915 916 /* 917 * Show an option if 918 * - it's set to a non-default value OR 919 * - if the per-sb default is different from the global default 920 */ 921 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 922 { 923 int def_errors; 924 unsigned long def_mount_opts; 925 struct super_block *sb = vfs->mnt_sb; 926 struct ext4_sb_info *sbi = EXT4_SB(sb); 927 struct ext4_super_block *es = sbi->s_es; 928 929 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 930 def_errors = le16_to_cpu(es->s_errors); 931 932 if (sbi->s_sb_block != 1) 933 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 934 if (test_opt(sb, MINIX_DF)) 935 seq_puts(seq, ",minixdf"); 936 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 937 seq_puts(seq, ",grpid"); 938 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 939 seq_puts(seq, ",nogrpid"); 940 if (sbi->s_resuid != EXT4_DEF_RESUID || 941 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 942 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 943 } 944 if (sbi->s_resgid != EXT4_DEF_RESGID || 945 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 946 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 947 } 948 if (test_opt(sb, ERRORS_RO)) { 949 if (def_errors == EXT4_ERRORS_PANIC || 950 def_errors == EXT4_ERRORS_CONTINUE) { 951 seq_puts(seq, ",errors=remount-ro"); 952 } 953 } 954 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 955 seq_puts(seq, ",errors=continue"); 956 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 957 seq_puts(seq, ",errors=panic"); 958 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 959 seq_puts(seq, ",nouid32"); 960 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 961 seq_puts(seq, ",debug"); 962 if (test_opt(sb, OLDALLOC)) 963 seq_puts(seq, ",oldalloc"); 964 #ifdef CONFIG_EXT4_FS_XATTR 965 if (test_opt(sb, XATTR_USER) && 966 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 967 seq_puts(seq, ",user_xattr"); 968 if (!test_opt(sb, XATTR_USER) && 969 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 970 seq_puts(seq, ",nouser_xattr"); 971 } 972 #endif 973 #ifdef CONFIG_EXT4_FS_POSIX_ACL 974 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 975 seq_puts(seq, ",acl"); 976 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 977 seq_puts(seq, ",noacl"); 978 #endif 979 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 980 seq_printf(seq, ",commit=%u", 981 (unsigned) (sbi->s_commit_interval / HZ)); 982 } 983 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 984 seq_printf(seq, ",min_batch_time=%u", 985 (unsigned) sbi->s_min_batch_time); 986 } 987 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 988 seq_printf(seq, ",max_batch_time=%u", 989 (unsigned) sbi->s_min_batch_time); 990 } 991 992 /* 993 * We're changing the default of barrier mount option, so 994 * let's always display its mount state so it's clear what its 995 * status is. 996 */ 997 seq_puts(seq, ",barrier="); 998 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 999 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 1000 seq_puts(seq, ",journal_async_commit"); 1001 else if (test_opt(sb, JOURNAL_CHECKSUM)) 1002 seq_puts(seq, ",journal_checksum"); 1003 if (test_opt(sb, I_VERSION)) 1004 seq_puts(seq, ",i_version"); 1005 if (!test_opt(sb, DELALLOC) && 1006 !(def_mount_opts & EXT4_DEFM_NODELALLOC)) 1007 seq_puts(seq, ",nodelalloc"); 1008 1009 if (sbi->s_stripe) 1010 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 1011 /* 1012 * journal mode get enabled in different ways 1013 * So just print the value even if we didn't specify it 1014 */ 1015 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1016 seq_puts(seq, ",data=journal"); 1017 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1018 seq_puts(seq, ",data=ordered"); 1019 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1020 seq_puts(seq, ",data=writeback"); 1021 1022 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1023 seq_printf(seq, ",inode_readahead_blks=%u", 1024 sbi->s_inode_readahead_blks); 1025 1026 if (test_opt(sb, DATA_ERR_ABORT)) 1027 seq_puts(seq, ",data_err=abort"); 1028 1029 if (test_opt(sb, NO_AUTO_DA_ALLOC)) 1030 seq_puts(seq, ",noauto_da_alloc"); 1031 1032 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) 1033 seq_puts(seq, ",discard"); 1034 1035 if (test_opt(sb, NOLOAD)) 1036 seq_puts(seq, ",norecovery"); 1037 1038 if (test_opt(sb, DIOREAD_NOLOCK)) 1039 seq_puts(seq, ",dioread_nolock"); 1040 1041 if (test_opt(sb, BLOCK_VALIDITY) && 1042 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)) 1043 seq_puts(seq, ",block_validity"); 1044 1045 ext4_show_quota_options(seq, sb); 1046 1047 return 0; 1048 } 1049 1050 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1051 u64 ino, u32 generation) 1052 { 1053 struct inode *inode; 1054 1055 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1056 return ERR_PTR(-ESTALE); 1057 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1058 return ERR_PTR(-ESTALE); 1059 1060 /* iget isn't really right if the inode is currently unallocated!! 1061 * 1062 * ext4_read_inode will return a bad_inode if the inode had been 1063 * deleted, so we should be safe. 1064 * 1065 * Currently we don't know the generation for parent directory, so 1066 * a generation of 0 means "accept any" 1067 */ 1068 inode = ext4_iget(sb, ino); 1069 if (IS_ERR(inode)) 1070 return ERR_CAST(inode); 1071 if (generation && inode->i_generation != generation) { 1072 iput(inode); 1073 return ERR_PTR(-ESTALE); 1074 } 1075 1076 return inode; 1077 } 1078 1079 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1080 int fh_len, int fh_type) 1081 { 1082 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1083 ext4_nfs_get_inode); 1084 } 1085 1086 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1087 int fh_len, int fh_type) 1088 { 1089 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1090 ext4_nfs_get_inode); 1091 } 1092 1093 /* 1094 * Try to release metadata pages (indirect blocks, directories) which are 1095 * mapped via the block device. Since these pages could have journal heads 1096 * which would prevent try_to_free_buffers() from freeing them, we must use 1097 * jbd2 layer's try_to_free_buffers() function to release them. 1098 */ 1099 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1100 gfp_t wait) 1101 { 1102 journal_t *journal = EXT4_SB(sb)->s_journal; 1103 1104 WARN_ON(PageChecked(page)); 1105 if (!page_has_buffers(page)) 1106 return 0; 1107 if (journal) 1108 return jbd2_journal_try_to_free_buffers(journal, page, 1109 wait & ~__GFP_WAIT); 1110 return try_to_free_buffers(page); 1111 } 1112 1113 #ifdef CONFIG_QUOTA 1114 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 1115 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 1116 1117 static int ext4_write_dquot(struct dquot *dquot); 1118 static int ext4_acquire_dquot(struct dquot *dquot); 1119 static int ext4_release_dquot(struct dquot *dquot); 1120 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1121 static int ext4_write_info(struct super_block *sb, int type); 1122 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1123 char *path); 1124 static int ext4_quota_off(struct super_block *sb, int type); 1125 static int ext4_quota_on_mount(struct super_block *sb, int type); 1126 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1127 size_t len, loff_t off); 1128 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1129 const char *data, size_t len, loff_t off); 1130 1131 static const struct dquot_operations ext4_quota_operations = { 1132 #ifdef CONFIG_QUOTA 1133 .get_reserved_space = ext4_get_reserved_space, 1134 #endif 1135 .write_dquot = ext4_write_dquot, 1136 .acquire_dquot = ext4_acquire_dquot, 1137 .release_dquot = ext4_release_dquot, 1138 .mark_dirty = ext4_mark_dquot_dirty, 1139 .write_info = ext4_write_info, 1140 .alloc_dquot = dquot_alloc, 1141 .destroy_dquot = dquot_destroy, 1142 }; 1143 1144 static const struct quotactl_ops ext4_qctl_operations = { 1145 .quota_on = ext4_quota_on, 1146 .quota_off = ext4_quota_off, 1147 .quota_sync = dquot_quota_sync, 1148 .get_info = dquot_get_dqinfo, 1149 .set_info = dquot_set_dqinfo, 1150 .get_dqblk = dquot_get_dqblk, 1151 .set_dqblk = dquot_set_dqblk 1152 }; 1153 #endif 1154 1155 static const struct super_operations ext4_sops = { 1156 .alloc_inode = ext4_alloc_inode, 1157 .destroy_inode = ext4_destroy_inode, 1158 .write_inode = ext4_write_inode, 1159 .dirty_inode = ext4_dirty_inode, 1160 .evict_inode = ext4_evict_inode, 1161 .put_super = ext4_put_super, 1162 .sync_fs = ext4_sync_fs, 1163 .freeze_fs = ext4_freeze, 1164 .unfreeze_fs = ext4_unfreeze, 1165 .statfs = ext4_statfs, 1166 .remount_fs = ext4_remount, 1167 .show_options = ext4_show_options, 1168 #ifdef CONFIG_QUOTA 1169 .quota_read = ext4_quota_read, 1170 .quota_write = ext4_quota_write, 1171 #endif 1172 .bdev_try_to_free_page = bdev_try_to_free_page, 1173 }; 1174 1175 static const struct super_operations ext4_nojournal_sops = { 1176 .alloc_inode = ext4_alloc_inode, 1177 .destroy_inode = ext4_destroy_inode, 1178 .write_inode = ext4_write_inode, 1179 .dirty_inode = ext4_dirty_inode, 1180 .evict_inode = ext4_evict_inode, 1181 .write_super = ext4_write_super, 1182 .put_super = ext4_put_super, 1183 .statfs = ext4_statfs, 1184 .remount_fs = ext4_remount, 1185 .show_options = ext4_show_options, 1186 #ifdef CONFIG_QUOTA 1187 .quota_read = ext4_quota_read, 1188 .quota_write = ext4_quota_write, 1189 #endif 1190 .bdev_try_to_free_page = bdev_try_to_free_page, 1191 }; 1192 1193 static const struct export_operations ext4_export_ops = { 1194 .fh_to_dentry = ext4_fh_to_dentry, 1195 .fh_to_parent = ext4_fh_to_parent, 1196 .get_parent = ext4_get_parent, 1197 }; 1198 1199 enum { 1200 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1201 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1202 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, 1203 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1204 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh, 1205 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1206 Opt_journal_update, Opt_journal_dev, 1207 Opt_journal_checksum, Opt_journal_async_commit, 1208 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1209 Opt_data_err_abort, Opt_data_err_ignore, 1210 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1211 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1212 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, 1213 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version, 1214 Opt_stripe, Opt_delalloc, Opt_nodelalloc, 1215 Opt_block_validity, Opt_noblock_validity, 1216 Opt_inode_readahead_blks, Opt_journal_ioprio, 1217 Opt_dioread_nolock, Opt_dioread_lock, 1218 Opt_discard, Opt_nodiscard, 1219 }; 1220 1221 static const match_table_t tokens = { 1222 {Opt_bsd_df, "bsddf"}, 1223 {Opt_minix_df, "minixdf"}, 1224 {Opt_grpid, "grpid"}, 1225 {Opt_grpid, "bsdgroups"}, 1226 {Opt_nogrpid, "nogrpid"}, 1227 {Opt_nogrpid, "sysvgroups"}, 1228 {Opt_resgid, "resgid=%u"}, 1229 {Opt_resuid, "resuid=%u"}, 1230 {Opt_sb, "sb=%u"}, 1231 {Opt_err_cont, "errors=continue"}, 1232 {Opt_err_panic, "errors=panic"}, 1233 {Opt_err_ro, "errors=remount-ro"}, 1234 {Opt_nouid32, "nouid32"}, 1235 {Opt_debug, "debug"}, 1236 {Opt_oldalloc, "oldalloc"}, 1237 {Opt_orlov, "orlov"}, 1238 {Opt_user_xattr, "user_xattr"}, 1239 {Opt_nouser_xattr, "nouser_xattr"}, 1240 {Opt_acl, "acl"}, 1241 {Opt_noacl, "noacl"}, 1242 {Opt_noload, "noload"}, 1243 {Opt_noload, "norecovery"}, 1244 {Opt_nobh, "nobh"}, 1245 {Opt_bh, "bh"}, 1246 {Opt_commit, "commit=%u"}, 1247 {Opt_min_batch_time, "min_batch_time=%u"}, 1248 {Opt_max_batch_time, "max_batch_time=%u"}, 1249 {Opt_journal_update, "journal=update"}, 1250 {Opt_journal_dev, "journal_dev=%u"}, 1251 {Opt_journal_checksum, "journal_checksum"}, 1252 {Opt_journal_async_commit, "journal_async_commit"}, 1253 {Opt_abort, "abort"}, 1254 {Opt_data_journal, "data=journal"}, 1255 {Opt_data_ordered, "data=ordered"}, 1256 {Opt_data_writeback, "data=writeback"}, 1257 {Opt_data_err_abort, "data_err=abort"}, 1258 {Opt_data_err_ignore, "data_err=ignore"}, 1259 {Opt_offusrjquota, "usrjquota="}, 1260 {Opt_usrjquota, "usrjquota=%s"}, 1261 {Opt_offgrpjquota, "grpjquota="}, 1262 {Opt_grpjquota, "grpjquota=%s"}, 1263 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1264 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1265 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1266 {Opt_grpquota, "grpquota"}, 1267 {Opt_noquota, "noquota"}, 1268 {Opt_quota, "quota"}, 1269 {Opt_usrquota, "usrquota"}, 1270 {Opt_barrier, "barrier=%u"}, 1271 {Opt_barrier, "barrier"}, 1272 {Opt_nobarrier, "nobarrier"}, 1273 {Opt_i_version, "i_version"}, 1274 {Opt_stripe, "stripe=%u"}, 1275 {Opt_resize, "resize"}, 1276 {Opt_delalloc, "delalloc"}, 1277 {Opt_nodelalloc, "nodelalloc"}, 1278 {Opt_block_validity, "block_validity"}, 1279 {Opt_noblock_validity, "noblock_validity"}, 1280 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1281 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1282 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1283 {Opt_auto_da_alloc, "auto_da_alloc"}, 1284 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1285 {Opt_dioread_nolock, "dioread_nolock"}, 1286 {Opt_dioread_lock, "dioread_lock"}, 1287 {Opt_discard, "discard"}, 1288 {Opt_nodiscard, "nodiscard"}, 1289 {Opt_err, NULL}, 1290 }; 1291 1292 static ext4_fsblk_t get_sb_block(void **data) 1293 { 1294 ext4_fsblk_t sb_block; 1295 char *options = (char *) *data; 1296 1297 if (!options || strncmp(options, "sb=", 3) != 0) 1298 return 1; /* Default location */ 1299 1300 options += 3; 1301 /* TODO: use simple_strtoll with >32bit ext4 */ 1302 sb_block = simple_strtoul(options, &options, 0); 1303 if (*options && *options != ',') { 1304 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1305 (char *) *data); 1306 return 1; 1307 } 1308 if (*options == ',') 1309 options++; 1310 *data = (void *) options; 1311 1312 return sb_block; 1313 } 1314 1315 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1316 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1317 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1318 1319 #ifdef CONFIG_QUOTA 1320 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1321 { 1322 struct ext4_sb_info *sbi = EXT4_SB(sb); 1323 char *qname; 1324 1325 if (sb_any_quota_loaded(sb) && 1326 !sbi->s_qf_names[qtype]) { 1327 ext4_msg(sb, KERN_ERR, 1328 "Cannot change journaled " 1329 "quota options when quota turned on"); 1330 return 0; 1331 } 1332 qname = match_strdup(args); 1333 if (!qname) { 1334 ext4_msg(sb, KERN_ERR, 1335 "Not enough memory for storing quotafile name"); 1336 return 0; 1337 } 1338 if (sbi->s_qf_names[qtype] && 1339 strcmp(sbi->s_qf_names[qtype], qname)) { 1340 ext4_msg(sb, KERN_ERR, 1341 "%s quota file already specified", QTYPE2NAME(qtype)); 1342 kfree(qname); 1343 return 0; 1344 } 1345 sbi->s_qf_names[qtype] = qname; 1346 if (strchr(sbi->s_qf_names[qtype], '/')) { 1347 ext4_msg(sb, KERN_ERR, 1348 "quotafile must be on filesystem root"); 1349 kfree(sbi->s_qf_names[qtype]); 1350 sbi->s_qf_names[qtype] = NULL; 1351 return 0; 1352 } 1353 set_opt(sbi->s_mount_opt, QUOTA); 1354 return 1; 1355 } 1356 1357 static int clear_qf_name(struct super_block *sb, int qtype) 1358 { 1359 1360 struct ext4_sb_info *sbi = EXT4_SB(sb); 1361 1362 if (sb_any_quota_loaded(sb) && 1363 sbi->s_qf_names[qtype]) { 1364 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1365 " when quota turned on"); 1366 return 0; 1367 } 1368 /* 1369 * The space will be released later when all options are confirmed 1370 * to be correct 1371 */ 1372 sbi->s_qf_names[qtype] = NULL; 1373 return 1; 1374 } 1375 #endif 1376 1377 static int parse_options(char *options, struct super_block *sb, 1378 unsigned long *journal_devnum, 1379 unsigned int *journal_ioprio, 1380 ext4_fsblk_t *n_blocks_count, int is_remount) 1381 { 1382 struct ext4_sb_info *sbi = EXT4_SB(sb); 1383 char *p; 1384 substring_t args[MAX_OPT_ARGS]; 1385 int data_opt = 0; 1386 int option; 1387 #ifdef CONFIG_QUOTA 1388 int qfmt; 1389 #endif 1390 1391 if (!options) 1392 return 1; 1393 1394 while ((p = strsep(&options, ",")) != NULL) { 1395 int token; 1396 if (!*p) 1397 continue; 1398 1399 /* 1400 * Initialize args struct so we know whether arg was 1401 * found; some options take optional arguments. 1402 */ 1403 args[0].to = args[0].from = 0; 1404 token = match_token(p, tokens, args); 1405 switch (token) { 1406 case Opt_bsd_df: 1407 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1408 clear_opt(sbi->s_mount_opt, MINIX_DF); 1409 break; 1410 case Opt_minix_df: 1411 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1412 set_opt(sbi->s_mount_opt, MINIX_DF); 1413 1414 break; 1415 case Opt_grpid: 1416 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1417 set_opt(sbi->s_mount_opt, GRPID); 1418 1419 break; 1420 case Opt_nogrpid: 1421 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1422 clear_opt(sbi->s_mount_opt, GRPID); 1423 1424 break; 1425 case Opt_resuid: 1426 if (match_int(&args[0], &option)) 1427 return 0; 1428 sbi->s_resuid = option; 1429 break; 1430 case Opt_resgid: 1431 if (match_int(&args[0], &option)) 1432 return 0; 1433 sbi->s_resgid = option; 1434 break; 1435 case Opt_sb: 1436 /* handled by get_sb_block() instead of here */ 1437 /* *sb_block = match_int(&args[0]); */ 1438 break; 1439 case Opt_err_panic: 1440 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1441 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1442 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1443 break; 1444 case Opt_err_ro: 1445 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1446 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1447 set_opt(sbi->s_mount_opt, ERRORS_RO); 1448 break; 1449 case Opt_err_cont: 1450 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1451 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1452 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1453 break; 1454 case Opt_nouid32: 1455 set_opt(sbi->s_mount_opt, NO_UID32); 1456 break; 1457 case Opt_debug: 1458 set_opt(sbi->s_mount_opt, DEBUG); 1459 break; 1460 case Opt_oldalloc: 1461 set_opt(sbi->s_mount_opt, OLDALLOC); 1462 break; 1463 case Opt_orlov: 1464 clear_opt(sbi->s_mount_opt, OLDALLOC); 1465 break; 1466 #ifdef CONFIG_EXT4_FS_XATTR 1467 case Opt_user_xattr: 1468 set_opt(sbi->s_mount_opt, XATTR_USER); 1469 break; 1470 case Opt_nouser_xattr: 1471 clear_opt(sbi->s_mount_opt, XATTR_USER); 1472 break; 1473 #else 1474 case Opt_user_xattr: 1475 case Opt_nouser_xattr: 1476 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); 1477 break; 1478 #endif 1479 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1480 case Opt_acl: 1481 set_opt(sbi->s_mount_opt, POSIX_ACL); 1482 break; 1483 case Opt_noacl: 1484 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1485 break; 1486 #else 1487 case Opt_acl: 1488 case Opt_noacl: 1489 ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); 1490 break; 1491 #endif 1492 case Opt_journal_update: 1493 /* @@@ FIXME */ 1494 /* Eventually we will want to be able to create 1495 a journal file here. For now, only allow the 1496 user to specify an existing inode to be the 1497 journal file. */ 1498 if (is_remount) { 1499 ext4_msg(sb, KERN_ERR, 1500 "Cannot specify journal on remount"); 1501 return 0; 1502 } 1503 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1504 break; 1505 case Opt_journal_dev: 1506 if (is_remount) { 1507 ext4_msg(sb, KERN_ERR, 1508 "Cannot specify journal on remount"); 1509 return 0; 1510 } 1511 if (match_int(&args[0], &option)) 1512 return 0; 1513 *journal_devnum = option; 1514 break; 1515 case Opt_journal_checksum: 1516 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1517 break; 1518 case Opt_journal_async_commit: 1519 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1520 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1521 break; 1522 case Opt_noload: 1523 set_opt(sbi->s_mount_opt, NOLOAD); 1524 break; 1525 case Opt_commit: 1526 if (match_int(&args[0], &option)) 1527 return 0; 1528 if (option < 0) 1529 return 0; 1530 if (option == 0) 1531 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1532 sbi->s_commit_interval = HZ * option; 1533 break; 1534 case Opt_max_batch_time: 1535 if (match_int(&args[0], &option)) 1536 return 0; 1537 if (option < 0) 1538 return 0; 1539 if (option == 0) 1540 option = EXT4_DEF_MAX_BATCH_TIME; 1541 sbi->s_max_batch_time = option; 1542 break; 1543 case Opt_min_batch_time: 1544 if (match_int(&args[0], &option)) 1545 return 0; 1546 if (option < 0) 1547 return 0; 1548 sbi->s_min_batch_time = option; 1549 break; 1550 case Opt_data_journal: 1551 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1552 goto datacheck; 1553 case Opt_data_ordered: 1554 data_opt = EXT4_MOUNT_ORDERED_DATA; 1555 goto datacheck; 1556 case Opt_data_writeback: 1557 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1558 datacheck: 1559 if (is_remount) { 1560 if (test_opt(sb, DATA_FLAGS) != data_opt) { 1561 ext4_msg(sb, KERN_ERR, 1562 "Cannot change data mode on remount"); 1563 return 0; 1564 } 1565 } else { 1566 clear_opt(sbi->s_mount_opt, DATA_FLAGS); 1567 sbi->s_mount_opt |= data_opt; 1568 } 1569 break; 1570 case Opt_data_err_abort: 1571 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1572 break; 1573 case Opt_data_err_ignore: 1574 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1575 break; 1576 #ifdef CONFIG_QUOTA 1577 case Opt_usrjquota: 1578 if (!set_qf_name(sb, USRQUOTA, &args[0])) 1579 return 0; 1580 break; 1581 case Opt_grpjquota: 1582 if (!set_qf_name(sb, GRPQUOTA, &args[0])) 1583 return 0; 1584 break; 1585 case Opt_offusrjquota: 1586 if (!clear_qf_name(sb, USRQUOTA)) 1587 return 0; 1588 break; 1589 case Opt_offgrpjquota: 1590 if (!clear_qf_name(sb, GRPQUOTA)) 1591 return 0; 1592 break; 1593 1594 case Opt_jqfmt_vfsold: 1595 qfmt = QFMT_VFS_OLD; 1596 goto set_qf_format; 1597 case Opt_jqfmt_vfsv0: 1598 qfmt = QFMT_VFS_V0; 1599 goto set_qf_format; 1600 case Opt_jqfmt_vfsv1: 1601 qfmt = QFMT_VFS_V1; 1602 set_qf_format: 1603 if (sb_any_quota_loaded(sb) && 1604 sbi->s_jquota_fmt != qfmt) { 1605 ext4_msg(sb, KERN_ERR, "Cannot change " 1606 "journaled quota options when " 1607 "quota turned on"); 1608 return 0; 1609 } 1610 sbi->s_jquota_fmt = qfmt; 1611 break; 1612 case Opt_quota: 1613 case Opt_usrquota: 1614 set_opt(sbi->s_mount_opt, QUOTA); 1615 set_opt(sbi->s_mount_opt, USRQUOTA); 1616 break; 1617 case Opt_grpquota: 1618 set_opt(sbi->s_mount_opt, QUOTA); 1619 set_opt(sbi->s_mount_opt, GRPQUOTA); 1620 break; 1621 case Opt_noquota: 1622 if (sb_any_quota_loaded(sb)) { 1623 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1624 "options when quota turned on"); 1625 return 0; 1626 } 1627 clear_opt(sbi->s_mount_opt, QUOTA); 1628 clear_opt(sbi->s_mount_opt, USRQUOTA); 1629 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1630 break; 1631 #else 1632 case Opt_quota: 1633 case Opt_usrquota: 1634 case Opt_grpquota: 1635 ext4_msg(sb, KERN_ERR, 1636 "quota options not supported"); 1637 break; 1638 case Opt_usrjquota: 1639 case Opt_grpjquota: 1640 case Opt_offusrjquota: 1641 case Opt_offgrpjquota: 1642 case Opt_jqfmt_vfsold: 1643 case Opt_jqfmt_vfsv0: 1644 case Opt_jqfmt_vfsv1: 1645 ext4_msg(sb, KERN_ERR, 1646 "journaled quota options not supported"); 1647 break; 1648 case Opt_noquota: 1649 break; 1650 #endif 1651 case Opt_abort: 1652 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1653 break; 1654 case Opt_nobarrier: 1655 clear_opt(sbi->s_mount_opt, BARRIER); 1656 break; 1657 case Opt_barrier: 1658 if (args[0].from) { 1659 if (match_int(&args[0], &option)) 1660 return 0; 1661 } else 1662 option = 1; /* No argument, default to 1 */ 1663 if (option) 1664 set_opt(sbi->s_mount_opt, BARRIER); 1665 else 1666 clear_opt(sbi->s_mount_opt, BARRIER); 1667 break; 1668 case Opt_ignore: 1669 break; 1670 case Opt_resize: 1671 if (!is_remount) { 1672 ext4_msg(sb, KERN_ERR, 1673 "resize option only available " 1674 "for remount"); 1675 return 0; 1676 } 1677 if (match_int(&args[0], &option) != 0) 1678 return 0; 1679 *n_blocks_count = option; 1680 break; 1681 case Opt_nobh: 1682 ext4_msg(sb, KERN_WARNING, 1683 "Ignoring deprecated nobh option"); 1684 break; 1685 case Opt_bh: 1686 ext4_msg(sb, KERN_WARNING, 1687 "Ignoring deprecated bh option"); 1688 break; 1689 case Opt_i_version: 1690 set_opt(sbi->s_mount_opt, I_VERSION); 1691 sb->s_flags |= MS_I_VERSION; 1692 break; 1693 case Opt_nodelalloc: 1694 clear_opt(sbi->s_mount_opt, DELALLOC); 1695 break; 1696 case Opt_stripe: 1697 if (match_int(&args[0], &option)) 1698 return 0; 1699 if (option < 0) 1700 return 0; 1701 sbi->s_stripe = option; 1702 break; 1703 case Opt_delalloc: 1704 set_opt(sbi->s_mount_opt, DELALLOC); 1705 break; 1706 case Opt_block_validity: 1707 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 1708 break; 1709 case Opt_noblock_validity: 1710 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 1711 break; 1712 case Opt_inode_readahead_blks: 1713 if (match_int(&args[0], &option)) 1714 return 0; 1715 if (option < 0 || option > (1 << 30)) 1716 return 0; 1717 if (!is_power_of_2(option)) { 1718 ext4_msg(sb, KERN_ERR, 1719 "EXT4-fs: inode_readahead_blks" 1720 " must be a power of 2"); 1721 return 0; 1722 } 1723 sbi->s_inode_readahead_blks = option; 1724 break; 1725 case Opt_journal_ioprio: 1726 if (match_int(&args[0], &option)) 1727 return 0; 1728 if (option < 0 || option > 7) 1729 break; 1730 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 1731 option); 1732 break; 1733 case Opt_noauto_da_alloc: 1734 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); 1735 break; 1736 case Opt_auto_da_alloc: 1737 if (args[0].from) { 1738 if (match_int(&args[0], &option)) 1739 return 0; 1740 } else 1741 option = 1; /* No argument, default to 1 */ 1742 if (option) 1743 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC); 1744 else 1745 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); 1746 break; 1747 case Opt_discard: 1748 set_opt(sbi->s_mount_opt, DISCARD); 1749 break; 1750 case Opt_nodiscard: 1751 clear_opt(sbi->s_mount_opt, DISCARD); 1752 break; 1753 case Opt_dioread_nolock: 1754 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 1755 break; 1756 case Opt_dioread_lock: 1757 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 1758 break; 1759 default: 1760 ext4_msg(sb, KERN_ERR, 1761 "Unrecognized mount option \"%s\" " 1762 "or missing value", p); 1763 return 0; 1764 } 1765 } 1766 #ifdef CONFIG_QUOTA 1767 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1768 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1769 clear_opt(sbi->s_mount_opt, USRQUOTA); 1770 1771 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1772 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1773 1774 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1775 ext4_msg(sb, KERN_ERR, "old and new quota " 1776 "format mixing"); 1777 return 0; 1778 } 1779 1780 if (!sbi->s_jquota_fmt) { 1781 ext4_msg(sb, KERN_ERR, "journaled quota format " 1782 "not specified"); 1783 return 0; 1784 } 1785 } else { 1786 if (sbi->s_jquota_fmt) { 1787 ext4_msg(sb, KERN_ERR, "journaled quota format " 1788 "specified with no journaling " 1789 "enabled"); 1790 return 0; 1791 } 1792 } 1793 #endif 1794 return 1; 1795 } 1796 1797 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1798 int read_only) 1799 { 1800 struct ext4_sb_info *sbi = EXT4_SB(sb); 1801 int res = 0; 1802 1803 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1804 ext4_msg(sb, KERN_ERR, "revision level too high, " 1805 "forcing read-only mode"); 1806 res = MS_RDONLY; 1807 } 1808 if (read_only) 1809 return res; 1810 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1811 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1812 "running e2fsck is recommended"); 1813 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1814 ext4_msg(sb, KERN_WARNING, 1815 "warning: mounting fs with errors, " 1816 "running e2fsck is recommended"); 1817 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1818 le16_to_cpu(es->s_mnt_count) >= 1819 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1820 ext4_msg(sb, KERN_WARNING, 1821 "warning: maximal mount count reached, " 1822 "running e2fsck is recommended"); 1823 else if (le32_to_cpu(es->s_checkinterval) && 1824 (le32_to_cpu(es->s_lastcheck) + 1825 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1826 ext4_msg(sb, KERN_WARNING, 1827 "warning: checktime reached, " 1828 "running e2fsck is recommended"); 1829 if (!sbi->s_journal) 1830 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1831 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1832 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1833 le16_add_cpu(&es->s_mnt_count, 1); 1834 es->s_mtime = cpu_to_le32(get_seconds()); 1835 ext4_update_dynamic_rev(sb); 1836 if (sbi->s_journal) 1837 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1838 1839 ext4_commit_super(sb, 1); 1840 if (test_opt(sb, DEBUG)) 1841 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1842 "bpg=%lu, ipg=%lu, mo=%04x]\n", 1843 sb->s_blocksize, 1844 sbi->s_groups_count, 1845 EXT4_BLOCKS_PER_GROUP(sb), 1846 EXT4_INODES_PER_GROUP(sb), 1847 sbi->s_mount_opt); 1848 1849 return res; 1850 } 1851 1852 static int ext4_fill_flex_info(struct super_block *sb) 1853 { 1854 struct ext4_sb_info *sbi = EXT4_SB(sb); 1855 struct ext4_group_desc *gdp = NULL; 1856 ext4_group_t flex_group_count; 1857 ext4_group_t flex_group; 1858 int groups_per_flex = 0; 1859 size_t size; 1860 int i; 1861 1862 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1863 groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1864 1865 if (groups_per_flex < 2) { 1866 sbi->s_log_groups_per_flex = 0; 1867 return 1; 1868 } 1869 1870 /* We allocate both existing and potentially added groups */ 1871 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1872 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 1873 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 1874 size = flex_group_count * sizeof(struct flex_groups); 1875 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL); 1876 if (sbi->s_flex_groups == NULL) { 1877 sbi->s_flex_groups = vmalloc(size); 1878 if (sbi->s_flex_groups) 1879 memset(sbi->s_flex_groups, 0, size); 1880 } 1881 if (sbi->s_flex_groups == NULL) { 1882 ext4_msg(sb, KERN_ERR, "not enough memory for " 1883 "%u flex groups", flex_group_count); 1884 goto failed; 1885 } 1886 1887 for (i = 0; i < sbi->s_groups_count; i++) { 1888 gdp = ext4_get_group_desc(sb, i, NULL); 1889 1890 flex_group = ext4_flex_group(sbi, i); 1891 atomic_add(ext4_free_inodes_count(sb, gdp), 1892 &sbi->s_flex_groups[flex_group].free_inodes); 1893 atomic_add(ext4_free_blks_count(sb, gdp), 1894 &sbi->s_flex_groups[flex_group].free_blocks); 1895 atomic_add(ext4_used_dirs_count(sb, gdp), 1896 &sbi->s_flex_groups[flex_group].used_dirs); 1897 } 1898 1899 return 1; 1900 failed: 1901 return 0; 1902 } 1903 1904 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1905 struct ext4_group_desc *gdp) 1906 { 1907 __u16 crc = 0; 1908 1909 if (sbi->s_es->s_feature_ro_compat & 1910 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1911 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1912 __le32 le_group = cpu_to_le32(block_group); 1913 1914 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1915 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1916 crc = crc16(crc, (__u8 *)gdp, offset); 1917 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1918 /* for checksum of struct ext4_group_desc do the rest...*/ 1919 if ((sbi->s_es->s_feature_incompat & 1920 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1921 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1922 crc = crc16(crc, (__u8 *)gdp + offset, 1923 le16_to_cpu(sbi->s_es->s_desc_size) - 1924 offset); 1925 } 1926 1927 return cpu_to_le16(crc); 1928 } 1929 1930 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1931 struct ext4_group_desc *gdp) 1932 { 1933 if ((sbi->s_es->s_feature_ro_compat & 1934 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1935 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1936 return 0; 1937 1938 return 1; 1939 } 1940 1941 /* Called at mount-time, super-block is locked */ 1942 static int ext4_check_descriptors(struct super_block *sb) 1943 { 1944 struct ext4_sb_info *sbi = EXT4_SB(sb); 1945 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1946 ext4_fsblk_t last_block; 1947 ext4_fsblk_t block_bitmap; 1948 ext4_fsblk_t inode_bitmap; 1949 ext4_fsblk_t inode_table; 1950 int flexbg_flag = 0; 1951 ext4_group_t i; 1952 1953 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1954 flexbg_flag = 1; 1955 1956 ext4_debug("Checking group descriptors"); 1957 1958 for (i = 0; i < sbi->s_groups_count; i++) { 1959 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1960 1961 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1962 last_block = ext4_blocks_count(sbi->s_es) - 1; 1963 else 1964 last_block = first_block + 1965 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1966 1967 block_bitmap = ext4_block_bitmap(sb, gdp); 1968 if (block_bitmap < first_block || block_bitmap > last_block) { 1969 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1970 "Block bitmap for group %u not in group " 1971 "(block %llu)!", i, block_bitmap); 1972 return 0; 1973 } 1974 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1975 if (inode_bitmap < first_block || inode_bitmap > last_block) { 1976 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1977 "Inode bitmap for group %u not in group " 1978 "(block %llu)!", i, inode_bitmap); 1979 return 0; 1980 } 1981 inode_table = ext4_inode_table(sb, gdp); 1982 if (inode_table < first_block || 1983 inode_table + sbi->s_itb_per_group - 1 > last_block) { 1984 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1985 "Inode table for group %u not in group " 1986 "(block %llu)!", i, inode_table); 1987 return 0; 1988 } 1989 ext4_lock_group(sb, i); 1990 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1991 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1992 "Checksum for group %u failed (%u!=%u)", 1993 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1994 gdp)), le16_to_cpu(gdp->bg_checksum)); 1995 if (!(sb->s_flags & MS_RDONLY)) { 1996 ext4_unlock_group(sb, i); 1997 return 0; 1998 } 1999 } 2000 ext4_unlock_group(sb, i); 2001 if (!flexbg_flag) 2002 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2003 } 2004 2005 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 2006 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 2007 return 1; 2008 } 2009 2010 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2011 * the superblock) which were deleted from all directories, but held open by 2012 * a process at the time of a crash. We walk the list and try to delete these 2013 * inodes at recovery time (only with a read-write filesystem). 2014 * 2015 * In order to keep the orphan inode chain consistent during traversal (in 2016 * case of crash during recovery), we link each inode into the superblock 2017 * orphan list_head and handle it the same way as an inode deletion during 2018 * normal operation (which journals the operations for us). 2019 * 2020 * We only do an iget() and an iput() on each inode, which is very safe if we 2021 * accidentally point at an in-use or already deleted inode. The worst that 2022 * can happen in this case is that we get a "bit already cleared" message from 2023 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2024 * e2fsck was run on this filesystem, and it must have already done the orphan 2025 * inode cleanup for us, so we can safely abort without any further action. 2026 */ 2027 static void ext4_orphan_cleanup(struct super_block *sb, 2028 struct ext4_super_block *es) 2029 { 2030 unsigned int s_flags = sb->s_flags; 2031 int nr_orphans = 0, nr_truncates = 0; 2032 #ifdef CONFIG_QUOTA 2033 int i; 2034 #endif 2035 if (!es->s_last_orphan) { 2036 jbd_debug(4, "no orphan inodes to clean up\n"); 2037 return; 2038 } 2039 2040 if (bdev_read_only(sb->s_bdev)) { 2041 ext4_msg(sb, KERN_ERR, "write access " 2042 "unavailable, skipping orphan cleanup"); 2043 return; 2044 } 2045 2046 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2047 if (es->s_last_orphan) 2048 jbd_debug(1, "Errors on filesystem, " 2049 "clearing orphan list.\n"); 2050 es->s_last_orphan = 0; 2051 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2052 return; 2053 } 2054 2055 if (s_flags & MS_RDONLY) { 2056 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2057 sb->s_flags &= ~MS_RDONLY; 2058 } 2059 #ifdef CONFIG_QUOTA 2060 /* Needed for iput() to work correctly and not trash data */ 2061 sb->s_flags |= MS_ACTIVE; 2062 /* Turn on quotas so that they are updated correctly */ 2063 for (i = 0; i < MAXQUOTAS; i++) { 2064 if (EXT4_SB(sb)->s_qf_names[i]) { 2065 int ret = ext4_quota_on_mount(sb, i); 2066 if (ret < 0) 2067 ext4_msg(sb, KERN_ERR, 2068 "Cannot turn on journaled " 2069 "quota: error %d", ret); 2070 } 2071 } 2072 #endif 2073 2074 while (es->s_last_orphan) { 2075 struct inode *inode; 2076 2077 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2078 if (IS_ERR(inode)) { 2079 es->s_last_orphan = 0; 2080 break; 2081 } 2082 2083 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2084 dquot_initialize(inode); 2085 if (inode->i_nlink) { 2086 ext4_msg(sb, KERN_DEBUG, 2087 "%s: truncating inode %lu to %lld bytes", 2088 __func__, inode->i_ino, inode->i_size); 2089 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2090 inode->i_ino, inode->i_size); 2091 ext4_truncate(inode); 2092 nr_truncates++; 2093 } else { 2094 ext4_msg(sb, KERN_DEBUG, 2095 "%s: deleting unreferenced inode %lu", 2096 __func__, inode->i_ino); 2097 jbd_debug(2, "deleting unreferenced inode %lu\n", 2098 inode->i_ino); 2099 nr_orphans++; 2100 } 2101 iput(inode); /* The delete magic happens here! */ 2102 } 2103 2104 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2105 2106 if (nr_orphans) 2107 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2108 PLURAL(nr_orphans)); 2109 if (nr_truncates) 2110 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2111 PLURAL(nr_truncates)); 2112 #ifdef CONFIG_QUOTA 2113 /* Turn quotas off */ 2114 for (i = 0; i < MAXQUOTAS; i++) { 2115 if (sb_dqopt(sb)->files[i]) 2116 dquot_quota_off(sb, i); 2117 } 2118 #endif 2119 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2120 } 2121 2122 /* 2123 * Maximal extent format file size. 2124 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2125 * extent format containers, within a sector_t, and within i_blocks 2126 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2127 * so that won't be a limiting factor. 2128 * 2129 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2130 */ 2131 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2132 { 2133 loff_t res; 2134 loff_t upper_limit = MAX_LFS_FILESIZE; 2135 2136 /* small i_blocks in vfs inode? */ 2137 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2138 /* 2139 * CONFIG_LBDAF is not enabled implies the inode 2140 * i_block represent total blocks in 512 bytes 2141 * 32 == size of vfs inode i_blocks * 8 2142 */ 2143 upper_limit = (1LL << 32) - 1; 2144 2145 /* total blocks in file system block size */ 2146 upper_limit >>= (blkbits - 9); 2147 upper_limit <<= blkbits; 2148 } 2149 2150 /* 32-bit extent-start container, ee_block */ 2151 res = 1LL << 32; 2152 res <<= blkbits; 2153 res -= 1; 2154 2155 /* Sanity check against vm- & vfs- imposed limits */ 2156 if (res > upper_limit) 2157 res = upper_limit; 2158 2159 return res; 2160 } 2161 2162 /* 2163 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2164 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2165 * We need to be 1 filesystem block less than the 2^48 sector limit. 2166 */ 2167 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2168 { 2169 loff_t res = EXT4_NDIR_BLOCKS; 2170 int meta_blocks; 2171 loff_t upper_limit; 2172 /* This is calculated to be the largest file size for a dense, block 2173 * mapped file such that the file's total number of 512-byte sectors, 2174 * including data and all indirect blocks, does not exceed (2^48 - 1). 2175 * 2176 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2177 * number of 512-byte sectors of the file. 2178 */ 2179 2180 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2181 /* 2182 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2183 * the inode i_block field represents total file blocks in 2184 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2185 */ 2186 upper_limit = (1LL << 32) - 1; 2187 2188 /* total blocks in file system block size */ 2189 upper_limit >>= (bits - 9); 2190 2191 } else { 2192 /* 2193 * We use 48 bit ext4_inode i_blocks 2194 * With EXT4_HUGE_FILE_FL set the i_blocks 2195 * represent total number of blocks in 2196 * file system block size 2197 */ 2198 upper_limit = (1LL << 48) - 1; 2199 2200 } 2201 2202 /* indirect blocks */ 2203 meta_blocks = 1; 2204 /* double indirect blocks */ 2205 meta_blocks += 1 + (1LL << (bits-2)); 2206 /* tripple indirect blocks */ 2207 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2208 2209 upper_limit -= meta_blocks; 2210 upper_limit <<= bits; 2211 2212 res += 1LL << (bits-2); 2213 res += 1LL << (2*(bits-2)); 2214 res += 1LL << (3*(bits-2)); 2215 res <<= bits; 2216 if (res > upper_limit) 2217 res = upper_limit; 2218 2219 if (res > MAX_LFS_FILESIZE) 2220 res = MAX_LFS_FILESIZE; 2221 2222 return res; 2223 } 2224 2225 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2226 ext4_fsblk_t logical_sb_block, int nr) 2227 { 2228 struct ext4_sb_info *sbi = EXT4_SB(sb); 2229 ext4_group_t bg, first_meta_bg; 2230 int has_super = 0; 2231 2232 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2233 2234 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2235 nr < first_meta_bg) 2236 return logical_sb_block + nr + 1; 2237 bg = sbi->s_desc_per_block * nr; 2238 if (ext4_bg_has_super(sb, bg)) 2239 has_super = 1; 2240 2241 return (has_super + ext4_group_first_block_no(sb, bg)); 2242 } 2243 2244 /** 2245 * ext4_get_stripe_size: Get the stripe size. 2246 * @sbi: In memory super block info 2247 * 2248 * If we have specified it via mount option, then 2249 * use the mount option value. If the value specified at mount time is 2250 * greater than the blocks per group use the super block value. 2251 * If the super block value is greater than blocks per group return 0. 2252 * Allocator needs it be less than blocks per group. 2253 * 2254 */ 2255 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2256 { 2257 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2258 unsigned long stripe_width = 2259 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2260 2261 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2262 return sbi->s_stripe; 2263 2264 if (stripe_width <= sbi->s_blocks_per_group) 2265 return stripe_width; 2266 2267 if (stride <= sbi->s_blocks_per_group) 2268 return stride; 2269 2270 return 0; 2271 } 2272 2273 /* sysfs supprt */ 2274 2275 struct ext4_attr { 2276 struct attribute attr; 2277 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 2278 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 2279 const char *, size_t); 2280 int offset; 2281 }; 2282 2283 static int parse_strtoul(const char *buf, 2284 unsigned long max, unsigned long *value) 2285 { 2286 char *endp; 2287 2288 *value = simple_strtoul(skip_spaces(buf), &endp, 0); 2289 endp = skip_spaces(endp); 2290 if (*endp || *value > max) 2291 return -EINVAL; 2292 2293 return 0; 2294 } 2295 2296 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 2297 struct ext4_sb_info *sbi, 2298 char *buf) 2299 { 2300 return snprintf(buf, PAGE_SIZE, "%llu\n", 2301 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); 2302 } 2303 2304 static ssize_t session_write_kbytes_show(struct ext4_attr *a, 2305 struct ext4_sb_info *sbi, char *buf) 2306 { 2307 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2308 2309 if (!sb->s_bdev->bd_part) 2310 return snprintf(buf, PAGE_SIZE, "0\n"); 2311 return snprintf(buf, PAGE_SIZE, "%lu\n", 2312 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2313 sbi->s_sectors_written_start) >> 1); 2314 } 2315 2316 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 2317 struct ext4_sb_info *sbi, char *buf) 2318 { 2319 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2320 2321 if (!sb->s_bdev->bd_part) 2322 return snprintf(buf, PAGE_SIZE, "0\n"); 2323 return snprintf(buf, PAGE_SIZE, "%llu\n", 2324 (unsigned long long)(sbi->s_kbytes_written + 2325 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2326 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 2327 } 2328 2329 static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 2330 struct ext4_sb_info *sbi, 2331 const char *buf, size_t count) 2332 { 2333 unsigned long t; 2334 2335 if (parse_strtoul(buf, 0x40000000, &t)) 2336 return -EINVAL; 2337 2338 if (!is_power_of_2(t)) 2339 return -EINVAL; 2340 2341 sbi->s_inode_readahead_blks = t; 2342 return count; 2343 } 2344 2345 static ssize_t sbi_ui_show(struct ext4_attr *a, 2346 struct ext4_sb_info *sbi, char *buf) 2347 { 2348 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2349 2350 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 2351 } 2352 2353 static ssize_t sbi_ui_store(struct ext4_attr *a, 2354 struct ext4_sb_info *sbi, 2355 const char *buf, size_t count) 2356 { 2357 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2358 unsigned long t; 2359 2360 if (parse_strtoul(buf, 0xffffffff, &t)) 2361 return -EINVAL; 2362 *ui = t; 2363 return count; 2364 } 2365 2366 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 2367 static struct ext4_attr ext4_attr_##_name = { \ 2368 .attr = {.name = __stringify(_name), .mode = _mode }, \ 2369 .show = _show, \ 2370 .store = _store, \ 2371 .offset = offsetof(struct ext4_sb_info, _elname), \ 2372 } 2373 #define EXT4_ATTR(name, mode, show, store) \ 2374 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 2375 2376 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 2377 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 2378 #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 2379 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 2380 #define ATTR_LIST(name) &ext4_attr_##name.attr 2381 2382 EXT4_RO_ATTR(delayed_allocation_blocks); 2383 EXT4_RO_ATTR(session_write_kbytes); 2384 EXT4_RO_ATTR(lifetime_write_kbytes); 2385 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 2386 inode_readahead_blks_store, s_inode_readahead_blks); 2387 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 2388 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 2389 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 2390 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 2391 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 2392 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 2393 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 2394 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); 2395 2396 static struct attribute *ext4_attrs[] = { 2397 ATTR_LIST(delayed_allocation_blocks), 2398 ATTR_LIST(session_write_kbytes), 2399 ATTR_LIST(lifetime_write_kbytes), 2400 ATTR_LIST(inode_readahead_blks), 2401 ATTR_LIST(inode_goal), 2402 ATTR_LIST(mb_stats), 2403 ATTR_LIST(mb_max_to_scan), 2404 ATTR_LIST(mb_min_to_scan), 2405 ATTR_LIST(mb_order2_req), 2406 ATTR_LIST(mb_stream_req), 2407 ATTR_LIST(mb_group_prealloc), 2408 ATTR_LIST(max_writeback_mb_bump), 2409 NULL, 2410 }; 2411 2412 static ssize_t ext4_attr_show(struct kobject *kobj, 2413 struct attribute *attr, char *buf) 2414 { 2415 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2416 s_kobj); 2417 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2418 2419 return a->show ? a->show(a, sbi, buf) : 0; 2420 } 2421 2422 static ssize_t ext4_attr_store(struct kobject *kobj, 2423 struct attribute *attr, 2424 const char *buf, size_t len) 2425 { 2426 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2427 s_kobj); 2428 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2429 2430 return a->store ? a->store(a, sbi, buf, len) : 0; 2431 } 2432 2433 static void ext4_sb_release(struct kobject *kobj) 2434 { 2435 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2436 s_kobj); 2437 complete(&sbi->s_kobj_unregister); 2438 } 2439 2440 2441 static const struct sysfs_ops ext4_attr_ops = { 2442 .show = ext4_attr_show, 2443 .store = ext4_attr_store, 2444 }; 2445 2446 static struct kobj_type ext4_ktype = { 2447 .default_attrs = ext4_attrs, 2448 .sysfs_ops = &ext4_attr_ops, 2449 .release = ext4_sb_release, 2450 }; 2451 2452 /* 2453 * Check whether this filesystem can be mounted based on 2454 * the features present and the RDONLY/RDWR mount requested. 2455 * Returns 1 if this filesystem can be mounted as requested, 2456 * 0 if it cannot be. 2457 */ 2458 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2459 { 2460 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2461 ext4_msg(sb, KERN_ERR, 2462 "Couldn't mount because of " 2463 "unsupported optional features (%x)", 2464 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2465 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2466 return 0; 2467 } 2468 2469 if (readonly) 2470 return 1; 2471 2472 /* Check that feature set is OK for a read-write mount */ 2473 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2474 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2475 "unsupported optional features (%x)", 2476 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2477 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2478 return 0; 2479 } 2480 /* 2481 * Large file size enabled file system can only be mounted 2482 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2483 */ 2484 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2485 if (sizeof(blkcnt_t) < sizeof(u64)) { 2486 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2487 "cannot be mounted RDWR without " 2488 "CONFIG_LBDAF"); 2489 return 0; 2490 } 2491 } 2492 return 1; 2493 } 2494 2495 /* 2496 * This function is called once a day if we have errors logged 2497 * on the file system 2498 */ 2499 static void print_daily_error_info(unsigned long arg) 2500 { 2501 struct super_block *sb = (struct super_block *) arg; 2502 struct ext4_sb_info *sbi; 2503 struct ext4_super_block *es; 2504 2505 sbi = EXT4_SB(sb); 2506 es = sbi->s_es; 2507 2508 if (es->s_error_count) 2509 ext4_msg(sb, KERN_NOTICE, "error count: %u", 2510 le32_to_cpu(es->s_error_count)); 2511 if (es->s_first_error_time) { 2512 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", 2513 sb->s_id, le32_to_cpu(es->s_first_error_time), 2514 (int) sizeof(es->s_first_error_func), 2515 es->s_first_error_func, 2516 le32_to_cpu(es->s_first_error_line)); 2517 if (es->s_first_error_ino) 2518 printk(": inode %u", 2519 le32_to_cpu(es->s_first_error_ino)); 2520 if (es->s_first_error_block) 2521 printk(": block %llu", (unsigned long long) 2522 le64_to_cpu(es->s_first_error_block)); 2523 printk("\n"); 2524 } 2525 if (es->s_last_error_time) { 2526 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", 2527 sb->s_id, le32_to_cpu(es->s_last_error_time), 2528 (int) sizeof(es->s_last_error_func), 2529 es->s_last_error_func, 2530 le32_to_cpu(es->s_last_error_line)); 2531 if (es->s_last_error_ino) 2532 printk(": inode %u", 2533 le32_to_cpu(es->s_last_error_ino)); 2534 if (es->s_last_error_block) 2535 printk(": block %llu", (unsigned long long) 2536 le64_to_cpu(es->s_last_error_block)); 2537 printk("\n"); 2538 } 2539 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2540 } 2541 2542 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 2543 __releases(kernel_lock) 2544 __acquires(kernel_lock) 2545 { 2546 char *orig_data = kstrdup(data, GFP_KERNEL); 2547 struct buffer_head *bh; 2548 struct ext4_super_block *es = NULL; 2549 struct ext4_sb_info *sbi; 2550 ext4_fsblk_t block; 2551 ext4_fsblk_t sb_block = get_sb_block(&data); 2552 ext4_fsblk_t logical_sb_block; 2553 unsigned long offset = 0; 2554 unsigned long journal_devnum = 0; 2555 unsigned long def_mount_opts; 2556 struct inode *root; 2557 char *cp; 2558 const char *descr; 2559 int ret = -ENOMEM; 2560 int blocksize; 2561 unsigned int db_count; 2562 unsigned int i; 2563 int needs_recovery, has_huge_files; 2564 __u64 blocks_count; 2565 int err; 2566 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 2567 2568 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 2569 if (!sbi) 2570 goto out_free_orig; 2571 2572 sbi->s_blockgroup_lock = 2573 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 2574 if (!sbi->s_blockgroup_lock) { 2575 kfree(sbi); 2576 goto out_free_orig; 2577 } 2578 sb->s_fs_info = sbi; 2579 sbi->s_mount_opt = 0; 2580 sbi->s_resuid = EXT4_DEF_RESUID; 2581 sbi->s_resgid = EXT4_DEF_RESGID; 2582 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 2583 sbi->s_sb_block = sb_block; 2584 if (sb->s_bdev->bd_part) 2585 sbi->s_sectors_written_start = 2586 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 2587 2588 /* Cleanup superblock name */ 2589 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 2590 *cp = '!'; 2591 2592 ret = -EINVAL; 2593 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 2594 if (!blocksize) { 2595 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 2596 goto out_fail; 2597 } 2598 2599 /* 2600 * The ext4 superblock will not be buffer aligned for other than 1kB 2601 * block sizes. We need to calculate the offset from buffer start. 2602 */ 2603 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 2604 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2605 offset = do_div(logical_sb_block, blocksize); 2606 } else { 2607 logical_sb_block = sb_block; 2608 } 2609 2610 if (!(bh = sb_bread(sb, logical_sb_block))) { 2611 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 2612 goto out_fail; 2613 } 2614 /* 2615 * Note: s_es must be initialized as soon as possible because 2616 * some ext4 macro-instructions depend on its value 2617 */ 2618 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2619 sbi->s_es = es; 2620 sb->s_magic = le16_to_cpu(es->s_magic); 2621 if (sb->s_magic != EXT4_SUPER_MAGIC) 2622 goto cantfind_ext4; 2623 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 2624 2625 /* Set defaults before we parse the mount options */ 2626 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 2627 if (def_mount_opts & EXT4_DEFM_DEBUG) 2628 set_opt(sbi->s_mount_opt, DEBUG); 2629 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) { 2630 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups", 2631 "2.6.38"); 2632 set_opt(sbi->s_mount_opt, GRPID); 2633 } 2634 if (def_mount_opts & EXT4_DEFM_UID16) 2635 set_opt(sbi->s_mount_opt, NO_UID32); 2636 #ifdef CONFIG_EXT4_FS_XATTR 2637 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 2638 set_opt(sbi->s_mount_opt, XATTR_USER); 2639 #endif 2640 #ifdef CONFIG_EXT4_FS_POSIX_ACL 2641 if (def_mount_opts & EXT4_DEFM_ACL) 2642 set_opt(sbi->s_mount_opt, POSIX_ACL); 2643 #endif 2644 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 2645 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2646 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 2647 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2648 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 2649 set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 2650 2651 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 2652 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 2653 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 2654 set_opt(sbi->s_mount_opt, ERRORS_CONT); 2655 else 2656 set_opt(sbi->s_mount_opt, ERRORS_RO); 2657 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) 2658 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 2659 if (def_mount_opts & EXT4_DEFM_DISCARD) 2660 set_opt(sbi->s_mount_opt, DISCARD); 2661 2662 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 2663 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 2664 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 2665 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 2666 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 2667 2668 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 2669 set_opt(sbi->s_mount_opt, BARRIER); 2670 2671 /* 2672 * enable delayed allocation by default 2673 * Use -o nodelalloc to turn it off 2674 */ 2675 if (!IS_EXT3_SB(sb) && 2676 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 2677 set_opt(sbi->s_mount_opt, DELALLOC); 2678 2679 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 2680 &journal_devnum, &journal_ioprio, NULL, 0)) { 2681 ext4_msg(sb, KERN_WARNING, 2682 "failed to parse options in superblock: %s", 2683 sbi->s_es->s_mount_opts); 2684 } 2685 if (!parse_options((char *) data, sb, &journal_devnum, 2686 &journal_ioprio, NULL, 0)) 2687 goto failed_mount; 2688 2689 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2690 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 2691 2692 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2693 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2694 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2695 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2696 ext4_msg(sb, KERN_WARNING, 2697 "feature flags set on rev 0 fs, " 2698 "running e2fsck is recommended"); 2699 2700 /* 2701 * Check feature flags regardless of the revision level, since we 2702 * previously didn't change the revision level when setting the flags, 2703 * so there is a chance incompat flags are set on a rev 0 filesystem. 2704 */ 2705 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 2706 goto failed_mount; 2707 2708 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2709 2710 if (blocksize < EXT4_MIN_BLOCK_SIZE || 2711 blocksize > EXT4_MAX_BLOCK_SIZE) { 2712 ext4_msg(sb, KERN_ERR, 2713 "Unsupported filesystem blocksize %d", blocksize); 2714 goto failed_mount; 2715 } 2716 2717 if (sb->s_blocksize != blocksize) { 2718 /* Validate the filesystem blocksize */ 2719 if (!sb_set_blocksize(sb, blocksize)) { 2720 ext4_msg(sb, KERN_ERR, "bad block size %d", 2721 blocksize); 2722 goto failed_mount; 2723 } 2724 2725 brelse(bh); 2726 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2727 offset = do_div(logical_sb_block, blocksize); 2728 bh = sb_bread(sb, logical_sb_block); 2729 if (!bh) { 2730 ext4_msg(sb, KERN_ERR, 2731 "Can't read superblock on 2nd try"); 2732 goto failed_mount; 2733 } 2734 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2735 sbi->s_es = es; 2736 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2737 ext4_msg(sb, KERN_ERR, 2738 "Magic mismatch, very weird!"); 2739 goto failed_mount; 2740 } 2741 } 2742 2743 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2744 EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 2745 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 2746 has_huge_files); 2747 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 2748 2749 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2750 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2751 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2752 } else { 2753 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2754 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2755 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2756 (!is_power_of_2(sbi->s_inode_size)) || 2757 (sbi->s_inode_size > blocksize)) { 2758 ext4_msg(sb, KERN_ERR, 2759 "unsupported inode size: %d", 2760 sbi->s_inode_size); 2761 goto failed_mount; 2762 } 2763 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2764 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2765 } 2766 2767 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2768 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2769 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2770 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2771 !is_power_of_2(sbi->s_desc_size)) { 2772 ext4_msg(sb, KERN_ERR, 2773 "unsupported descriptor size %lu", 2774 sbi->s_desc_size); 2775 goto failed_mount; 2776 } 2777 } else 2778 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2779 2780 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2781 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2782 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2783 goto cantfind_ext4; 2784 2785 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2786 if (sbi->s_inodes_per_block == 0) 2787 goto cantfind_ext4; 2788 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2789 sbi->s_inodes_per_block; 2790 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2791 sbi->s_sbh = bh; 2792 sbi->s_mount_state = le16_to_cpu(es->s_state); 2793 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2794 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2795 2796 for (i = 0; i < 4; i++) 2797 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2798 sbi->s_def_hash_version = es->s_def_hash_version; 2799 i = le32_to_cpu(es->s_flags); 2800 if (i & EXT2_FLAGS_UNSIGNED_HASH) 2801 sbi->s_hash_unsigned = 3; 2802 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 2803 #ifdef __CHAR_UNSIGNED__ 2804 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 2805 sbi->s_hash_unsigned = 3; 2806 #else 2807 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 2808 #endif 2809 sb->s_dirt = 1; 2810 } 2811 2812 if (sbi->s_blocks_per_group > blocksize * 8) { 2813 ext4_msg(sb, KERN_ERR, 2814 "#blocks per group too big: %lu", 2815 sbi->s_blocks_per_group); 2816 goto failed_mount; 2817 } 2818 if (sbi->s_inodes_per_group > blocksize * 8) { 2819 ext4_msg(sb, KERN_ERR, 2820 "#inodes per group too big: %lu", 2821 sbi->s_inodes_per_group); 2822 goto failed_mount; 2823 } 2824 2825 /* 2826 * Test whether we have more sectors than will fit in sector_t, 2827 * and whether the max offset is addressable by the page cache. 2828 */ 2829 ret = generic_check_addressable(sb->s_blocksize_bits, 2830 ext4_blocks_count(es)); 2831 if (ret) { 2832 ext4_msg(sb, KERN_ERR, "filesystem" 2833 " too large to mount safely on this system"); 2834 if (sizeof(sector_t) < 8) 2835 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 2836 goto failed_mount; 2837 } 2838 2839 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2840 goto cantfind_ext4; 2841 2842 /* check blocks count against device size */ 2843 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 2844 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 2845 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 2846 "exceeds size of device (%llu blocks)", 2847 ext4_blocks_count(es), blocks_count); 2848 goto failed_mount; 2849 } 2850 2851 /* 2852 * It makes no sense for the first data block to be beyond the end 2853 * of the filesystem. 2854 */ 2855 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 2856 ext4_msg(sb, KERN_WARNING, "bad geometry: first data" 2857 "block %u is beyond end of filesystem (%llu)", 2858 le32_to_cpu(es->s_first_data_block), 2859 ext4_blocks_count(es)); 2860 goto failed_mount; 2861 } 2862 blocks_count = (ext4_blocks_count(es) - 2863 le32_to_cpu(es->s_first_data_block) + 2864 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2865 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2866 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 2867 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 2868 "(block count %llu, first data block %u, " 2869 "blocks per group %lu)", sbi->s_groups_count, 2870 ext4_blocks_count(es), 2871 le32_to_cpu(es->s_first_data_block), 2872 EXT4_BLOCKS_PER_GROUP(sb)); 2873 goto failed_mount; 2874 } 2875 sbi->s_groups_count = blocks_count; 2876 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 2877 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 2878 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2879 EXT4_DESC_PER_BLOCK(sb); 2880 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2881 GFP_KERNEL); 2882 if (sbi->s_group_desc == NULL) { 2883 ext4_msg(sb, KERN_ERR, "not enough memory"); 2884 goto failed_mount; 2885 } 2886 2887 #ifdef CONFIG_PROC_FS 2888 if (ext4_proc_root) 2889 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 2890 #endif 2891 2892 bgl_lock_init(sbi->s_blockgroup_lock); 2893 2894 for (i = 0; i < db_count; i++) { 2895 block = descriptor_loc(sb, logical_sb_block, i); 2896 sbi->s_group_desc[i] = sb_bread(sb, block); 2897 if (!sbi->s_group_desc[i]) { 2898 ext4_msg(sb, KERN_ERR, 2899 "can't read group descriptor %d", i); 2900 db_count = i; 2901 goto failed_mount2; 2902 } 2903 } 2904 if (!ext4_check_descriptors(sb)) { 2905 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 2906 goto failed_mount2; 2907 } 2908 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2909 if (!ext4_fill_flex_info(sb)) { 2910 ext4_msg(sb, KERN_ERR, 2911 "unable to initialize " 2912 "flex_bg meta info!"); 2913 goto failed_mount2; 2914 } 2915 2916 sbi->s_gdb_count = db_count; 2917 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2918 spin_lock_init(&sbi->s_next_gen_lock); 2919 2920 sbi->s_stripe = ext4_get_stripe_size(sbi); 2921 sbi->s_max_writeback_mb_bump = 128; 2922 2923 /* 2924 * set up enough so that it can read an inode 2925 */ 2926 if (!test_opt(sb, NOLOAD) && 2927 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 2928 sb->s_op = &ext4_sops; 2929 else 2930 sb->s_op = &ext4_nojournal_sops; 2931 sb->s_export_op = &ext4_export_ops; 2932 sb->s_xattr = ext4_xattr_handlers; 2933 #ifdef CONFIG_QUOTA 2934 sb->s_qcop = &ext4_qctl_operations; 2935 sb->dq_op = &ext4_quota_operations; 2936 #endif 2937 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2938 mutex_init(&sbi->s_orphan_lock); 2939 mutex_init(&sbi->s_resize_lock); 2940 2941 sb->s_root = NULL; 2942 2943 needs_recovery = (es->s_last_orphan != 0 || 2944 EXT4_HAS_INCOMPAT_FEATURE(sb, 2945 EXT4_FEATURE_INCOMPAT_RECOVER)); 2946 2947 /* 2948 * The first inode we look at is the journal inode. Don't try 2949 * root first: it may be modified in the journal! 2950 */ 2951 if (!test_opt(sb, NOLOAD) && 2952 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2953 if (ext4_load_journal(sb, es, journal_devnum)) 2954 goto failed_mount3; 2955 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 2956 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2957 ext4_msg(sb, KERN_ERR, "required journal recovery " 2958 "suppressed and not mounted read-only"); 2959 goto failed_mount_wq; 2960 } else { 2961 clear_opt(sbi->s_mount_opt, DATA_FLAGS); 2962 set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 2963 sbi->s_journal = NULL; 2964 needs_recovery = 0; 2965 goto no_journal; 2966 } 2967 2968 if (ext4_blocks_count(es) > 0xffffffffULL && 2969 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2970 JBD2_FEATURE_INCOMPAT_64BIT)) { 2971 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 2972 goto failed_mount_wq; 2973 } 2974 2975 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2976 jbd2_journal_set_features(sbi->s_journal, 2977 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2978 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2979 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2980 jbd2_journal_set_features(sbi->s_journal, 2981 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2982 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2983 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2984 } else { 2985 jbd2_journal_clear_features(sbi->s_journal, 2986 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2987 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2988 } 2989 2990 /* We have now updated the journal if required, so we can 2991 * validate the data journaling mode. */ 2992 switch (test_opt(sb, DATA_FLAGS)) { 2993 case 0: 2994 /* No mode set, assume a default based on the journal 2995 * capabilities: ORDERED_DATA if the journal can 2996 * cope, else JOURNAL_DATA 2997 */ 2998 if (jbd2_journal_check_available_features 2999 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3000 set_opt(sbi->s_mount_opt, ORDERED_DATA); 3001 else 3002 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 3003 break; 3004 3005 case EXT4_MOUNT_ORDERED_DATA: 3006 case EXT4_MOUNT_WRITEBACK_DATA: 3007 if (!jbd2_journal_check_available_features 3008 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3009 ext4_msg(sb, KERN_ERR, "Journal does not support " 3010 "requested data journaling mode"); 3011 goto failed_mount_wq; 3012 } 3013 default: 3014 break; 3015 } 3016 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3017 3018 no_journal: 3019 err = percpu_counter_init(&sbi->s_freeblocks_counter, 3020 ext4_count_free_blocks(sb)); 3021 if (!err) 3022 err = percpu_counter_init(&sbi->s_freeinodes_counter, 3023 ext4_count_free_inodes(sb)); 3024 if (!err) 3025 err = percpu_counter_init(&sbi->s_dirs_counter, 3026 ext4_count_dirs(sb)); 3027 if (!err) 3028 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 3029 if (err) { 3030 ext4_msg(sb, KERN_ERR, "insufficient memory"); 3031 goto failed_mount_wq; 3032 } 3033 3034 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten"); 3035 if (!EXT4_SB(sb)->dio_unwritten_wq) { 3036 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); 3037 goto failed_mount_wq; 3038 } 3039 3040 /* 3041 * The jbd2_journal_load will have done any necessary log recovery, 3042 * so we can safely mount the rest of the filesystem now. 3043 */ 3044 3045 root = ext4_iget(sb, EXT4_ROOT_INO); 3046 if (IS_ERR(root)) { 3047 ext4_msg(sb, KERN_ERR, "get root inode failed"); 3048 ret = PTR_ERR(root); 3049 goto failed_mount4; 3050 } 3051 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3052 iput(root); 3053 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 3054 goto failed_mount4; 3055 } 3056 sb->s_root = d_alloc_root(root); 3057 if (!sb->s_root) { 3058 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 3059 iput(root); 3060 ret = -ENOMEM; 3061 goto failed_mount4; 3062 } 3063 3064 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 3065 3066 /* determine the minimum size of new large inodes, if present */ 3067 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3068 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3069 EXT4_GOOD_OLD_INODE_SIZE; 3070 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3071 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 3072 if (sbi->s_want_extra_isize < 3073 le16_to_cpu(es->s_want_extra_isize)) 3074 sbi->s_want_extra_isize = 3075 le16_to_cpu(es->s_want_extra_isize); 3076 if (sbi->s_want_extra_isize < 3077 le16_to_cpu(es->s_min_extra_isize)) 3078 sbi->s_want_extra_isize = 3079 le16_to_cpu(es->s_min_extra_isize); 3080 } 3081 } 3082 /* Check if enough inode space is available */ 3083 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3084 sbi->s_inode_size) { 3085 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3086 EXT4_GOOD_OLD_INODE_SIZE; 3087 ext4_msg(sb, KERN_INFO, "required extra inode space not" 3088 "available"); 3089 } 3090 3091 if (test_opt(sb, DELALLOC) && 3092 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) { 3093 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - " 3094 "requested data journaling mode"); 3095 clear_opt(sbi->s_mount_opt, DELALLOC); 3096 } 3097 if (test_opt(sb, DIOREAD_NOLOCK)) { 3098 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3099 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " 3100 "option - requested data journaling mode"); 3101 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 3102 } 3103 if (sb->s_blocksize < PAGE_SIZE) { 3104 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " 3105 "option - block size is too small"); 3106 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 3107 } 3108 } 3109 3110 err = ext4_setup_system_zone(sb); 3111 if (err) { 3112 ext4_msg(sb, KERN_ERR, "failed to initialize system " 3113 "zone (%d)", err); 3114 goto failed_mount4; 3115 } 3116 3117 ext4_ext_init(sb); 3118 err = ext4_mb_init(sb, needs_recovery); 3119 if (err) { 3120 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3121 err); 3122 goto failed_mount4; 3123 } 3124 3125 sbi->s_kobj.kset = ext4_kset; 3126 init_completion(&sbi->s_kobj_unregister); 3127 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 3128 "%s", sb->s_id); 3129 if (err) { 3130 ext4_mb_release(sb); 3131 ext4_ext_release(sb); 3132 goto failed_mount4; 3133 }; 3134 3135 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3136 ext4_orphan_cleanup(sb, es); 3137 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 3138 if (needs_recovery) { 3139 ext4_msg(sb, KERN_INFO, "recovery complete"); 3140 ext4_mark_recovery_complete(sb, es); 3141 } 3142 if (EXT4_SB(sb)->s_journal) { 3143 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3144 descr = " journalled data mode"; 3145 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3146 descr = " ordered data mode"; 3147 else 3148 descr = " writeback data mode"; 3149 } else 3150 descr = "out journal"; 3151 3152 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 3153 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 3154 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 3155 3156 init_timer(&sbi->s_err_report); 3157 sbi->s_err_report.function = print_daily_error_info; 3158 sbi->s_err_report.data = (unsigned long) sb; 3159 if (es->s_error_count) 3160 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 3161 3162 kfree(orig_data); 3163 return 0; 3164 3165 cantfind_ext4: 3166 if (!silent) 3167 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 3168 goto failed_mount; 3169 3170 failed_mount4: 3171 ext4_msg(sb, KERN_ERR, "mount failed"); 3172 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); 3173 failed_mount_wq: 3174 ext4_release_system_zone(sb); 3175 if (sbi->s_journal) { 3176 jbd2_journal_destroy(sbi->s_journal); 3177 sbi->s_journal = NULL; 3178 } 3179 percpu_counter_destroy(&sbi->s_freeblocks_counter); 3180 percpu_counter_destroy(&sbi->s_freeinodes_counter); 3181 percpu_counter_destroy(&sbi->s_dirs_counter); 3182 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 3183 failed_mount3: 3184 if (sbi->s_flex_groups) { 3185 if (is_vmalloc_addr(sbi->s_flex_groups)) 3186 vfree(sbi->s_flex_groups); 3187 else 3188 kfree(sbi->s_flex_groups); 3189 } 3190 failed_mount2: 3191 for (i = 0; i < db_count; i++) 3192 brelse(sbi->s_group_desc[i]); 3193 kfree(sbi->s_group_desc); 3194 failed_mount: 3195 if (sbi->s_proc) { 3196 remove_proc_entry(sb->s_id, ext4_proc_root); 3197 } 3198 #ifdef CONFIG_QUOTA 3199 for (i = 0; i < MAXQUOTAS; i++) 3200 kfree(sbi->s_qf_names[i]); 3201 #endif 3202 ext4_blkdev_remove(sbi); 3203 brelse(bh); 3204 out_fail: 3205 sb->s_fs_info = NULL; 3206 kfree(sbi->s_blockgroup_lock); 3207 kfree(sbi); 3208 out_free_orig: 3209 kfree(orig_data); 3210 return ret; 3211 } 3212 3213 /* 3214 * Setup any per-fs journal parameters now. We'll do this both on 3215 * initial mount, once the journal has been initialised but before we've 3216 * done any recovery; and again on any subsequent remount. 3217 */ 3218 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 3219 { 3220 struct ext4_sb_info *sbi = EXT4_SB(sb); 3221 3222 journal->j_commit_interval = sbi->s_commit_interval; 3223 journal->j_min_batch_time = sbi->s_min_batch_time; 3224 journal->j_max_batch_time = sbi->s_max_batch_time; 3225 3226 write_lock(&journal->j_state_lock); 3227 if (test_opt(sb, BARRIER)) 3228 journal->j_flags |= JBD2_BARRIER; 3229 else 3230 journal->j_flags &= ~JBD2_BARRIER; 3231 if (test_opt(sb, DATA_ERR_ABORT)) 3232 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 3233 else 3234 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 3235 write_unlock(&journal->j_state_lock); 3236 } 3237 3238 static journal_t *ext4_get_journal(struct super_block *sb, 3239 unsigned int journal_inum) 3240 { 3241 struct inode *journal_inode; 3242 journal_t *journal; 3243 3244 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3245 3246 /* First, test for the existence of a valid inode on disk. Bad 3247 * things happen if we iget() an unused inode, as the subsequent 3248 * iput() will try to delete it. */ 3249 3250 journal_inode = ext4_iget(sb, journal_inum); 3251 if (IS_ERR(journal_inode)) { 3252 ext4_msg(sb, KERN_ERR, "no journal found"); 3253 return NULL; 3254 } 3255 if (!journal_inode->i_nlink) { 3256 make_bad_inode(journal_inode); 3257 iput(journal_inode); 3258 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 3259 return NULL; 3260 } 3261 3262 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 3263 journal_inode, journal_inode->i_size); 3264 if (!S_ISREG(journal_inode->i_mode)) { 3265 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 3266 iput(journal_inode); 3267 return NULL; 3268 } 3269 3270 journal = jbd2_journal_init_inode(journal_inode); 3271 if (!journal) { 3272 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 3273 iput(journal_inode); 3274 return NULL; 3275 } 3276 journal->j_private = sb; 3277 ext4_init_journal_params(sb, journal); 3278 return journal; 3279 } 3280 3281 static journal_t *ext4_get_dev_journal(struct super_block *sb, 3282 dev_t j_dev) 3283 { 3284 struct buffer_head *bh; 3285 journal_t *journal; 3286 ext4_fsblk_t start; 3287 ext4_fsblk_t len; 3288 int hblock, blocksize; 3289 ext4_fsblk_t sb_block; 3290 unsigned long offset; 3291 struct ext4_super_block *es; 3292 struct block_device *bdev; 3293 3294 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3295 3296 bdev = ext4_blkdev_get(j_dev, sb); 3297 if (bdev == NULL) 3298 return NULL; 3299 3300 if (bd_claim(bdev, sb)) { 3301 ext4_msg(sb, KERN_ERR, 3302 "failed to claim external journal device"); 3303 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 3304 return NULL; 3305 } 3306 3307 blocksize = sb->s_blocksize; 3308 hblock = bdev_logical_block_size(bdev); 3309 if (blocksize < hblock) { 3310 ext4_msg(sb, KERN_ERR, 3311 "blocksize too small for journal device"); 3312 goto out_bdev; 3313 } 3314 3315 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 3316 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 3317 set_blocksize(bdev, blocksize); 3318 if (!(bh = __bread(bdev, sb_block, blocksize))) { 3319 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 3320 "external journal"); 3321 goto out_bdev; 3322 } 3323 3324 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3325 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 3326 !(le32_to_cpu(es->s_feature_incompat) & 3327 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 3328 ext4_msg(sb, KERN_ERR, "external journal has " 3329 "bad superblock"); 3330 brelse(bh); 3331 goto out_bdev; 3332 } 3333 3334 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 3335 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 3336 brelse(bh); 3337 goto out_bdev; 3338 } 3339 3340 len = ext4_blocks_count(es); 3341 start = sb_block + 1; 3342 brelse(bh); /* we're done with the superblock */ 3343 3344 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 3345 start, len, blocksize); 3346 if (!journal) { 3347 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 3348 goto out_bdev; 3349 } 3350 journal->j_private = sb; 3351 ll_rw_block(READ, 1, &journal->j_sb_buffer); 3352 wait_on_buffer(journal->j_sb_buffer); 3353 if (!buffer_uptodate(journal->j_sb_buffer)) { 3354 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 3355 goto out_journal; 3356 } 3357 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 3358 ext4_msg(sb, KERN_ERR, "External journal has more than one " 3359 "user (unsupported) - %d", 3360 be32_to_cpu(journal->j_superblock->s_nr_users)); 3361 goto out_journal; 3362 } 3363 EXT4_SB(sb)->journal_bdev = bdev; 3364 ext4_init_journal_params(sb, journal); 3365 return journal; 3366 3367 out_journal: 3368 jbd2_journal_destroy(journal); 3369 out_bdev: 3370 ext4_blkdev_put(bdev); 3371 return NULL; 3372 } 3373 3374 static int ext4_load_journal(struct super_block *sb, 3375 struct ext4_super_block *es, 3376 unsigned long journal_devnum) 3377 { 3378 journal_t *journal; 3379 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 3380 dev_t journal_dev; 3381 int err = 0; 3382 int really_read_only; 3383 3384 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3385 3386 if (journal_devnum && 3387 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3388 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 3389 "numbers have changed"); 3390 journal_dev = new_decode_dev(journal_devnum); 3391 } else 3392 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 3393 3394 really_read_only = bdev_read_only(sb->s_bdev); 3395 3396 /* 3397 * Are we loading a blank journal or performing recovery after a 3398 * crash? For recovery, we need to check in advance whether we 3399 * can get read-write access to the device. 3400 */ 3401 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3402 if (sb->s_flags & MS_RDONLY) { 3403 ext4_msg(sb, KERN_INFO, "INFO: recovery " 3404 "required on readonly filesystem"); 3405 if (really_read_only) { 3406 ext4_msg(sb, KERN_ERR, "write access " 3407 "unavailable, cannot proceed"); 3408 return -EROFS; 3409 } 3410 ext4_msg(sb, KERN_INFO, "write access will " 3411 "be enabled during recovery"); 3412 } 3413 } 3414 3415 if (journal_inum && journal_dev) { 3416 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 3417 "and inode journals!"); 3418 return -EINVAL; 3419 } 3420 3421 if (journal_inum) { 3422 if (!(journal = ext4_get_journal(sb, journal_inum))) 3423 return -EINVAL; 3424 } else { 3425 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 3426 return -EINVAL; 3427 } 3428 3429 if (!(journal->j_flags & JBD2_BARRIER)) 3430 ext4_msg(sb, KERN_INFO, "barriers disabled"); 3431 3432 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 3433 err = jbd2_journal_update_format(journal); 3434 if (err) { 3435 ext4_msg(sb, KERN_ERR, "error updating journal"); 3436 jbd2_journal_destroy(journal); 3437 return err; 3438 } 3439 } 3440 3441 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 3442 err = jbd2_journal_wipe(journal, !really_read_only); 3443 if (!err) { 3444 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 3445 if (save) 3446 memcpy(save, ((char *) es) + 3447 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 3448 err = jbd2_journal_load(journal); 3449 if (save) 3450 memcpy(((char *) es) + EXT4_S_ERR_START, 3451 save, EXT4_S_ERR_LEN); 3452 kfree(save); 3453 } 3454 3455 if (err) { 3456 ext4_msg(sb, KERN_ERR, "error loading journal"); 3457 jbd2_journal_destroy(journal); 3458 return err; 3459 } 3460 3461 EXT4_SB(sb)->s_journal = journal; 3462 ext4_clear_journal_err(sb, es); 3463 3464 if (journal_devnum && 3465 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3466 es->s_journal_dev = cpu_to_le32(journal_devnum); 3467 3468 /* Make sure we flush the recovery flag to disk. */ 3469 ext4_commit_super(sb, 1); 3470 } 3471 3472 return 0; 3473 } 3474 3475 static int ext4_commit_super(struct super_block *sb, int sync) 3476 { 3477 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 3478 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 3479 int error = 0; 3480 3481 if (!sbh) 3482 return error; 3483 if (buffer_write_io_error(sbh)) { 3484 /* 3485 * Oh, dear. A previous attempt to write the 3486 * superblock failed. This could happen because the 3487 * USB device was yanked out. Or it could happen to 3488 * be a transient write error and maybe the block will 3489 * be remapped. Nothing we can do but to retry the 3490 * write and hope for the best. 3491 */ 3492 ext4_msg(sb, KERN_ERR, "previous I/O error to " 3493 "superblock detected"); 3494 clear_buffer_write_io_error(sbh); 3495 set_buffer_uptodate(sbh); 3496 } 3497 /* 3498 * If the file system is mounted read-only, don't update the 3499 * superblock write time. This avoids updating the superblock 3500 * write time when we are mounting the root file system 3501 * read/only but we need to replay the journal; at that point, 3502 * for people who are east of GMT and who make their clock 3503 * tick in localtime for Windows bug-for-bug compatibility, 3504 * the clock is set in the future, and this will cause e2fsck 3505 * to complain and force a full file system check. 3506 */ 3507 if (!(sb->s_flags & MS_RDONLY)) 3508 es->s_wtime = cpu_to_le32(get_seconds()); 3509 if (sb->s_bdev->bd_part) 3510 es->s_kbytes_written = 3511 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 3512 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 3513 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 3514 else 3515 es->s_kbytes_written = 3516 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 3517 ext4_free_blocks_count_set(es, percpu_counter_sum_positive( 3518 &EXT4_SB(sb)->s_freeblocks_counter)); 3519 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive( 3520 &EXT4_SB(sb)->s_freeinodes_counter)); 3521 sb->s_dirt = 0; 3522 BUFFER_TRACE(sbh, "marking dirty"); 3523 mark_buffer_dirty(sbh); 3524 if (sync) { 3525 error = sync_dirty_buffer(sbh); 3526 if (error) 3527 return error; 3528 3529 error = buffer_write_io_error(sbh); 3530 if (error) { 3531 ext4_msg(sb, KERN_ERR, "I/O error while writing " 3532 "superblock"); 3533 clear_buffer_write_io_error(sbh); 3534 set_buffer_uptodate(sbh); 3535 } 3536 } 3537 return error; 3538 } 3539 3540 /* 3541 * Have we just finished recovery? If so, and if we are mounting (or 3542 * remounting) the filesystem readonly, then we will end up with a 3543 * consistent fs on disk. Record that fact. 3544 */ 3545 static void ext4_mark_recovery_complete(struct super_block *sb, 3546 struct ext4_super_block *es) 3547 { 3548 journal_t *journal = EXT4_SB(sb)->s_journal; 3549 3550 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3551 BUG_ON(journal != NULL); 3552 return; 3553 } 3554 jbd2_journal_lock_updates(journal); 3555 if (jbd2_journal_flush(journal) < 0) 3556 goto out; 3557 3558 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 3559 sb->s_flags & MS_RDONLY) { 3560 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3561 ext4_commit_super(sb, 1); 3562 } 3563 3564 out: 3565 jbd2_journal_unlock_updates(journal); 3566 } 3567 3568 /* 3569 * If we are mounting (or read-write remounting) a filesystem whose journal 3570 * has recorded an error from a previous lifetime, move that error to the 3571 * main filesystem now. 3572 */ 3573 static void ext4_clear_journal_err(struct super_block *sb, 3574 struct ext4_super_block *es) 3575 { 3576 journal_t *journal; 3577 int j_errno; 3578 const char *errstr; 3579 3580 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3581 3582 journal = EXT4_SB(sb)->s_journal; 3583 3584 /* 3585 * Now check for any error status which may have been recorded in the 3586 * journal by a prior ext4_error() or ext4_abort() 3587 */ 3588 3589 j_errno = jbd2_journal_errno(journal); 3590 if (j_errno) { 3591 char nbuf[16]; 3592 3593 errstr = ext4_decode_error(sb, j_errno, nbuf); 3594 ext4_warning(sb, "Filesystem error recorded " 3595 "from previous mount: %s", errstr); 3596 ext4_warning(sb, "Marking fs in need of filesystem check."); 3597 3598 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 3599 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 3600 ext4_commit_super(sb, 1); 3601 3602 jbd2_journal_clear_err(journal); 3603 } 3604 } 3605 3606 /* 3607 * Force the running and committing transactions to commit, 3608 * and wait on the commit. 3609 */ 3610 int ext4_force_commit(struct super_block *sb) 3611 { 3612 journal_t *journal; 3613 int ret = 0; 3614 3615 if (sb->s_flags & MS_RDONLY) 3616 return 0; 3617 3618 journal = EXT4_SB(sb)->s_journal; 3619 if (journal) { 3620 vfs_check_frozen(sb, SB_FREEZE_TRANS); 3621 ret = ext4_journal_force_commit(journal); 3622 } 3623 3624 return ret; 3625 } 3626 3627 static void ext4_write_super(struct super_block *sb) 3628 { 3629 lock_super(sb); 3630 ext4_commit_super(sb, 1); 3631 unlock_super(sb); 3632 } 3633 3634 static int ext4_sync_fs(struct super_block *sb, int wait) 3635 { 3636 int ret = 0; 3637 tid_t target; 3638 struct ext4_sb_info *sbi = EXT4_SB(sb); 3639 3640 trace_ext4_sync_fs(sb, wait); 3641 flush_workqueue(sbi->dio_unwritten_wq); 3642 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 3643 if (wait) 3644 jbd2_log_wait_commit(sbi->s_journal, target); 3645 } 3646 return ret; 3647 } 3648 3649 /* 3650 * LVM calls this function before a (read-only) snapshot is created. This 3651 * gives us a chance to flush the journal completely and mark the fs clean. 3652 */ 3653 static int ext4_freeze(struct super_block *sb) 3654 { 3655 int error = 0; 3656 journal_t *journal; 3657 3658 if (sb->s_flags & MS_RDONLY) 3659 return 0; 3660 3661 journal = EXT4_SB(sb)->s_journal; 3662 3663 /* Now we set up the journal barrier. */ 3664 jbd2_journal_lock_updates(journal); 3665 3666 /* 3667 * Don't clear the needs_recovery flag if we failed to flush 3668 * the journal. 3669 */ 3670 error = jbd2_journal_flush(journal); 3671 if (error < 0) 3672 goto out; 3673 3674 /* Journal blocked and flushed, clear needs_recovery flag. */ 3675 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3676 error = ext4_commit_super(sb, 1); 3677 out: 3678 /* we rely on s_frozen to stop further updates */ 3679 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3680 return error; 3681 } 3682 3683 /* 3684 * Called by LVM after the snapshot is done. We need to reset the RECOVER 3685 * flag here, even though the filesystem is not technically dirty yet. 3686 */ 3687 static int ext4_unfreeze(struct super_block *sb) 3688 { 3689 if (sb->s_flags & MS_RDONLY) 3690 return 0; 3691 3692 lock_super(sb); 3693 /* Reset the needs_recovery flag before the fs is unlocked. */ 3694 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3695 ext4_commit_super(sb, 1); 3696 unlock_super(sb); 3697 return 0; 3698 } 3699 3700 static int ext4_remount(struct super_block *sb, int *flags, char *data) 3701 { 3702 struct ext4_super_block *es; 3703 struct ext4_sb_info *sbi = EXT4_SB(sb); 3704 ext4_fsblk_t n_blocks_count = 0; 3705 unsigned long old_sb_flags; 3706 struct ext4_mount_options old_opts; 3707 int enable_quota = 0; 3708 ext4_group_t g; 3709 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3710 int err; 3711 #ifdef CONFIG_QUOTA 3712 int i; 3713 #endif 3714 char *orig_data = kstrdup(data, GFP_KERNEL); 3715 3716 /* Store the original options */ 3717 lock_super(sb); 3718 old_sb_flags = sb->s_flags; 3719 old_opts.s_mount_opt = sbi->s_mount_opt; 3720 old_opts.s_resuid = sbi->s_resuid; 3721 old_opts.s_resgid = sbi->s_resgid; 3722 old_opts.s_commit_interval = sbi->s_commit_interval; 3723 old_opts.s_min_batch_time = sbi->s_min_batch_time; 3724 old_opts.s_max_batch_time = sbi->s_max_batch_time; 3725 #ifdef CONFIG_QUOTA 3726 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 3727 for (i = 0; i < MAXQUOTAS; i++) 3728 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 3729 #endif 3730 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 3731 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 3732 3733 /* 3734 * Allow the "check" option to be passed as a remount option. 3735 */ 3736 if (!parse_options(data, sb, NULL, &journal_ioprio, 3737 &n_blocks_count, 1)) { 3738 err = -EINVAL; 3739 goto restore_opts; 3740 } 3741 3742 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 3743 ext4_abort(sb, "Abort forced by user"); 3744 3745 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3746 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3747 3748 es = sbi->s_es; 3749 3750 if (sbi->s_journal) { 3751 ext4_init_journal_params(sb, sbi->s_journal); 3752 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3753 } 3754 3755 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 3756 n_blocks_count > ext4_blocks_count(es)) { 3757 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 3758 err = -EROFS; 3759 goto restore_opts; 3760 } 3761 3762 if (*flags & MS_RDONLY) { 3763 err = dquot_suspend(sb, -1); 3764 if (err < 0) 3765 goto restore_opts; 3766 3767 /* 3768 * First of all, the unconditional stuff we have to do 3769 * to disable replay of the journal when we next remount 3770 */ 3771 sb->s_flags |= MS_RDONLY; 3772 3773 /* 3774 * OK, test if we are remounting a valid rw partition 3775 * readonly, and if so set the rdonly flag and then 3776 * mark the partition as valid again. 3777 */ 3778 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3779 (sbi->s_mount_state & EXT4_VALID_FS)) 3780 es->s_state = cpu_to_le16(sbi->s_mount_state); 3781 3782 if (sbi->s_journal) 3783 ext4_mark_recovery_complete(sb, es); 3784 } else { 3785 /* Make sure we can mount this feature set readwrite */ 3786 if (!ext4_feature_set_ok(sb, 0)) { 3787 err = -EROFS; 3788 goto restore_opts; 3789 } 3790 /* 3791 * Make sure the group descriptor checksums 3792 * are sane. If they aren't, refuse to remount r/w. 3793 */ 3794 for (g = 0; g < sbi->s_groups_count; g++) { 3795 struct ext4_group_desc *gdp = 3796 ext4_get_group_desc(sb, g, NULL); 3797 3798 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 3799 ext4_msg(sb, KERN_ERR, 3800 "ext4_remount: Checksum for group %u failed (%u!=%u)", 3801 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 3802 le16_to_cpu(gdp->bg_checksum)); 3803 err = -EINVAL; 3804 goto restore_opts; 3805 } 3806 } 3807 3808 /* 3809 * If we have an unprocessed orphan list hanging 3810 * around from a previously readonly bdev mount, 3811 * require a full umount/remount for now. 3812 */ 3813 if (es->s_last_orphan) { 3814 ext4_msg(sb, KERN_WARNING, "Couldn't " 3815 "remount RDWR because of unprocessed " 3816 "orphan inode list. Please " 3817 "umount/remount instead"); 3818 err = -EINVAL; 3819 goto restore_opts; 3820 } 3821 3822 /* 3823 * Mounting a RDONLY partition read-write, so reread 3824 * and store the current valid flag. (It may have 3825 * been changed by e2fsck since we originally mounted 3826 * the partition.) 3827 */ 3828 if (sbi->s_journal) 3829 ext4_clear_journal_err(sb, es); 3830 sbi->s_mount_state = le16_to_cpu(es->s_state); 3831 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3832 goto restore_opts; 3833 if (!ext4_setup_super(sb, es, 0)) 3834 sb->s_flags &= ~MS_RDONLY; 3835 enable_quota = 1; 3836 } 3837 } 3838 ext4_setup_system_zone(sb); 3839 if (sbi->s_journal == NULL) 3840 ext4_commit_super(sb, 1); 3841 3842 #ifdef CONFIG_QUOTA 3843 /* Release old quota file names */ 3844 for (i = 0; i < MAXQUOTAS; i++) 3845 if (old_opts.s_qf_names[i] && 3846 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3847 kfree(old_opts.s_qf_names[i]); 3848 #endif 3849 unlock_super(sb); 3850 if (enable_quota) 3851 dquot_resume(sb, -1); 3852 3853 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 3854 kfree(orig_data); 3855 return 0; 3856 3857 restore_opts: 3858 sb->s_flags = old_sb_flags; 3859 sbi->s_mount_opt = old_opts.s_mount_opt; 3860 sbi->s_resuid = old_opts.s_resuid; 3861 sbi->s_resgid = old_opts.s_resgid; 3862 sbi->s_commit_interval = old_opts.s_commit_interval; 3863 sbi->s_min_batch_time = old_opts.s_min_batch_time; 3864 sbi->s_max_batch_time = old_opts.s_max_batch_time; 3865 #ifdef CONFIG_QUOTA 3866 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3867 for (i = 0; i < MAXQUOTAS; i++) { 3868 if (sbi->s_qf_names[i] && 3869 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3870 kfree(sbi->s_qf_names[i]); 3871 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3872 } 3873 #endif 3874 unlock_super(sb); 3875 kfree(orig_data); 3876 return err; 3877 } 3878 3879 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3880 { 3881 struct super_block *sb = dentry->d_sb; 3882 struct ext4_sb_info *sbi = EXT4_SB(sb); 3883 struct ext4_super_block *es = sbi->s_es; 3884 u64 fsid; 3885 3886 if (test_opt(sb, MINIX_DF)) { 3887 sbi->s_overhead_last = 0; 3888 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3889 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3890 ext4_fsblk_t overhead = 0; 3891 3892 /* 3893 * Compute the overhead (FS structures). This is constant 3894 * for a given filesystem unless the number of block groups 3895 * changes so we cache the previous value until it does. 3896 */ 3897 3898 /* 3899 * All of the blocks before first_data_block are 3900 * overhead 3901 */ 3902 overhead = le32_to_cpu(es->s_first_data_block); 3903 3904 /* 3905 * Add the overhead attributed to the superblock and 3906 * block group descriptors. If the sparse superblocks 3907 * feature is turned on, then not all groups have this. 3908 */ 3909 for (i = 0; i < ngroups; i++) { 3910 overhead += ext4_bg_has_super(sb, i) + 3911 ext4_bg_num_gdb(sb, i); 3912 cond_resched(); 3913 } 3914 3915 /* 3916 * Every block group has an inode bitmap, a block 3917 * bitmap, and an inode table. 3918 */ 3919 overhead += ngroups * (2 + sbi->s_itb_per_group); 3920 sbi->s_overhead_last = overhead; 3921 smp_wmb(); 3922 sbi->s_blocks_last = ext4_blocks_count(es); 3923 } 3924 3925 buf->f_type = EXT4_SUPER_MAGIC; 3926 buf->f_bsize = sb->s_blocksize; 3927 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 3928 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 3929 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 3930 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3931 if (buf->f_bfree < ext4_r_blocks_count(es)) 3932 buf->f_bavail = 0; 3933 buf->f_files = le32_to_cpu(es->s_inodes_count); 3934 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 3935 buf->f_namelen = EXT4_NAME_LEN; 3936 fsid = le64_to_cpup((void *)es->s_uuid) ^ 3937 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3938 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3939 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3940 3941 return 0; 3942 } 3943 3944 /* Helper function for writing quotas on sync - we need to start transaction 3945 * before quota file is locked for write. Otherwise the are possible deadlocks: 3946 * Process 1 Process 2 3947 * ext4_create() quota_sync() 3948 * jbd2_journal_start() write_dquot() 3949 * dquot_initialize() down(dqio_mutex) 3950 * down(dqio_mutex) jbd2_journal_start() 3951 * 3952 */ 3953 3954 #ifdef CONFIG_QUOTA 3955 3956 static inline struct inode *dquot_to_inode(struct dquot *dquot) 3957 { 3958 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3959 } 3960 3961 static int ext4_write_dquot(struct dquot *dquot) 3962 { 3963 int ret, err; 3964 handle_t *handle; 3965 struct inode *inode; 3966 3967 inode = dquot_to_inode(dquot); 3968 handle = ext4_journal_start(inode, 3969 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3970 if (IS_ERR(handle)) 3971 return PTR_ERR(handle); 3972 ret = dquot_commit(dquot); 3973 err = ext4_journal_stop(handle); 3974 if (!ret) 3975 ret = err; 3976 return ret; 3977 } 3978 3979 static int ext4_acquire_dquot(struct dquot *dquot) 3980 { 3981 int ret, err; 3982 handle_t *handle; 3983 3984 handle = ext4_journal_start(dquot_to_inode(dquot), 3985 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3986 if (IS_ERR(handle)) 3987 return PTR_ERR(handle); 3988 ret = dquot_acquire(dquot); 3989 err = ext4_journal_stop(handle); 3990 if (!ret) 3991 ret = err; 3992 return ret; 3993 } 3994 3995 static int ext4_release_dquot(struct dquot *dquot) 3996 { 3997 int ret, err; 3998 handle_t *handle; 3999 4000 handle = ext4_journal_start(dquot_to_inode(dquot), 4001 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 4002 if (IS_ERR(handle)) { 4003 /* Release dquot anyway to avoid endless cycle in dqput() */ 4004 dquot_release(dquot); 4005 return PTR_ERR(handle); 4006 } 4007 ret = dquot_release(dquot); 4008 err = ext4_journal_stop(handle); 4009 if (!ret) 4010 ret = err; 4011 return ret; 4012 } 4013 4014 static int ext4_mark_dquot_dirty(struct dquot *dquot) 4015 { 4016 /* Are we journaling quotas? */ 4017 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 4018 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 4019 dquot_mark_dquot_dirty(dquot); 4020 return ext4_write_dquot(dquot); 4021 } else { 4022 return dquot_mark_dquot_dirty(dquot); 4023 } 4024 } 4025 4026 static int ext4_write_info(struct super_block *sb, int type) 4027 { 4028 int ret, err; 4029 handle_t *handle; 4030 4031 /* Data block + inode block */ 4032 handle = ext4_journal_start(sb->s_root->d_inode, 2); 4033 if (IS_ERR(handle)) 4034 return PTR_ERR(handle); 4035 ret = dquot_commit_info(sb, type); 4036 err = ext4_journal_stop(handle); 4037 if (!ret) 4038 ret = err; 4039 return ret; 4040 } 4041 4042 /* 4043 * Turn on quotas during mount time - we need to find 4044 * the quota file and such... 4045 */ 4046 static int ext4_quota_on_mount(struct super_block *sb, int type) 4047 { 4048 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 4049 EXT4_SB(sb)->s_jquota_fmt, type); 4050 } 4051 4052 /* 4053 * Standard function to be called on quota_on 4054 */ 4055 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 4056 char *name) 4057 { 4058 int err; 4059 struct path path; 4060 4061 if (!test_opt(sb, QUOTA)) 4062 return -EINVAL; 4063 4064 err = kern_path(name, LOOKUP_FOLLOW, &path); 4065 if (err) 4066 return err; 4067 4068 /* Quotafile not on the same filesystem? */ 4069 if (path.mnt->mnt_sb != sb) { 4070 path_put(&path); 4071 return -EXDEV; 4072 } 4073 /* Journaling quota? */ 4074 if (EXT4_SB(sb)->s_qf_names[type]) { 4075 /* Quotafile not in fs root? */ 4076 if (path.dentry->d_parent != sb->s_root) 4077 ext4_msg(sb, KERN_WARNING, 4078 "Quota file not on filesystem root. " 4079 "Journaled quota will not work"); 4080 } 4081 4082 /* 4083 * When we journal data on quota file, we have to flush journal to see 4084 * all updates to the file when we bypass pagecache... 4085 */ 4086 if (EXT4_SB(sb)->s_journal && 4087 ext4_should_journal_data(path.dentry->d_inode)) { 4088 /* 4089 * We don't need to lock updates but journal_flush() could 4090 * otherwise be livelocked... 4091 */ 4092 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 4093 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 4094 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4095 if (err) { 4096 path_put(&path); 4097 return err; 4098 } 4099 } 4100 4101 err = dquot_quota_on_path(sb, type, format_id, &path); 4102 path_put(&path); 4103 return err; 4104 } 4105 4106 static int ext4_quota_off(struct super_block *sb, int type) 4107 { 4108 /* Force all delayed allocation blocks to be allocated */ 4109 if (test_opt(sb, DELALLOC)) { 4110 down_read(&sb->s_umount); 4111 sync_filesystem(sb); 4112 up_read(&sb->s_umount); 4113 } 4114 4115 return dquot_quota_off(sb, type); 4116 } 4117 4118 /* Read data from quotafile - avoid pagecache and such because we cannot afford 4119 * acquiring the locks... As quota files are never truncated and quota code 4120 * itself serializes the operations (and noone else should touch the files) 4121 * we don't have to be afraid of races */ 4122 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 4123 size_t len, loff_t off) 4124 { 4125 struct inode *inode = sb_dqopt(sb)->files[type]; 4126 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4127 int err = 0; 4128 int offset = off & (sb->s_blocksize - 1); 4129 int tocopy; 4130 size_t toread; 4131 struct buffer_head *bh; 4132 loff_t i_size = i_size_read(inode); 4133 4134 if (off > i_size) 4135 return 0; 4136 if (off+len > i_size) 4137 len = i_size-off; 4138 toread = len; 4139 while (toread > 0) { 4140 tocopy = sb->s_blocksize - offset < toread ? 4141 sb->s_blocksize - offset : toread; 4142 bh = ext4_bread(NULL, inode, blk, 0, &err); 4143 if (err) 4144 return err; 4145 if (!bh) /* A hole? */ 4146 memset(data, 0, tocopy); 4147 else 4148 memcpy(data, bh->b_data+offset, tocopy); 4149 brelse(bh); 4150 offset = 0; 4151 toread -= tocopy; 4152 data += tocopy; 4153 blk++; 4154 } 4155 return len; 4156 } 4157 4158 /* Write to quotafile (we know the transaction is already started and has 4159 * enough credits) */ 4160 static ssize_t ext4_quota_write(struct super_block *sb, int type, 4161 const char *data, size_t len, loff_t off) 4162 { 4163 struct inode *inode = sb_dqopt(sb)->files[type]; 4164 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4165 int err = 0; 4166 int offset = off & (sb->s_blocksize - 1); 4167 struct buffer_head *bh; 4168 handle_t *handle = journal_current_handle(); 4169 4170 if (EXT4_SB(sb)->s_journal && !handle) { 4171 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4172 " cancelled because transaction is not started", 4173 (unsigned long long)off, (unsigned long long)len); 4174 return -EIO; 4175 } 4176 /* 4177 * Since we account only one data block in transaction credits, 4178 * then it is impossible to cross a block boundary. 4179 */ 4180 if (sb->s_blocksize - offset < len) { 4181 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4182 " cancelled because not block aligned", 4183 (unsigned long long)off, (unsigned long long)len); 4184 return -EIO; 4185 } 4186 4187 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 4188 bh = ext4_bread(handle, inode, blk, 1, &err); 4189 if (!bh) 4190 goto out; 4191 err = ext4_journal_get_write_access(handle, bh); 4192 if (err) { 4193 brelse(bh); 4194 goto out; 4195 } 4196 lock_buffer(bh); 4197 memcpy(bh->b_data+offset, data, len); 4198 flush_dcache_page(bh->b_page); 4199 unlock_buffer(bh); 4200 err = ext4_handle_dirty_metadata(handle, NULL, bh); 4201 brelse(bh); 4202 out: 4203 if (err) { 4204 mutex_unlock(&inode->i_mutex); 4205 return err; 4206 } 4207 if (inode->i_size < off + len) { 4208 i_size_write(inode, off + len); 4209 EXT4_I(inode)->i_disksize = inode->i_size; 4210 } 4211 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4212 ext4_mark_inode_dirty(handle, inode); 4213 mutex_unlock(&inode->i_mutex); 4214 return len; 4215 } 4216 4217 #endif 4218 4219 static int ext4_get_sb(struct file_system_type *fs_type, int flags, 4220 const char *dev_name, void *data, struct vfsmount *mnt) 4221 { 4222 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt); 4223 } 4224 4225 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 4226 static struct file_system_type ext2_fs_type = { 4227 .owner = THIS_MODULE, 4228 .name = "ext2", 4229 .get_sb = ext4_get_sb, 4230 .kill_sb = kill_block_super, 4231 .fs_flags = FS_REQUIRES_DEV, 4232 }; 4233 4234 static inline void register_as_ext2(void) 4235 { 4236 int err = register_filesystem(&ext2_fs_type); 4237 if (err) 4238 printk(KERN_WARNING 4239 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 4240 } 4241 4242 static inline void unregister_as_ext2(void) 4243 { 4244 unregister_filesystem(&ext2_fs_type); 4245 } 4246 MODULE_ALIAS("ext2"); 4247 #else 4248 static inline void register_as_ext2(void) { } 4249 static inline void unregister_as_ext2(void) { } 4250 #endif 4251 4252 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 4253 static inline void register_as_ext3(void) 4254 { 4255 int err = register_filesystem(&ext3_fs_type); 4256 if (err) 4257 printk(KERN_WARNING 4258 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 4259 } 4260 4261 static inline void unregister_as_ext3(void) 4262 { 4263 unregister_filesystem(&ext3_fs_type); 4264 } 4265 MODULE_ALIAS("ext3"); 4266 #else 4267 static inline void register_as_ext3(void) { } 4268 static inline void unregister_as_ext3(void) { } 4269 #endif 4270 4271 static struct file_system_type ext4_fs_type = { 4272 .owner = THIS_MODULE, 4273 .name = "ext4", 4274 .get_sb = ext4_get_sb, 4275 .kill_sb = kill_block_super, 4276 .fs_flags = FS_REQUIRES_DEV, 4277 }; 4278 4279 static int __init init_ext4_fs(void) 4280 { 4281 int err; 4282 4283 ext4_check_flag_values(); 4284 err = init_ext4_system_zone(); 4285 if (err) 4286 return err; 4287 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 4288 if (!ext4_kset) 4289 goto out4; 4290 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 4291 err = init_ext4_mballoc(); 4292 if (err) 4293 goto out3; 4294 4295 err = init_ext4_xattr(); 4296 if (err) 4297 goto out2; 4298 err = init_inodecache(); 4299 if (err) 4300 goto out1; 4301 register_as_ext2(); 4302 register_as_ext3(); 4303 err = register_filesystem(&ext4_fs_type); 4304 if (err) 4305 goto out; 4306 return 0; 4307 out: 4308 unregister_as_ext2(); 4309 unregister_as_ext3(); 4310 destroy_inodecache(); 4311 out1: 4312 exit_ext4_xattr(); 4313 out2: 4314 exit_ext4_mballoc(); 4315 out3: 4316 remove_proc_entry("fs/ext4", NULL); 4317 kset_unregister(ext4_kset); 4318 out4: 4319 exit_ext4_system_zone(); 4320 return err; 4321 } 4322 4323 static void __exit exit_ext4_fs(void) 4324 { 4325 unregister_as_ext2(); 4326 unregister_as_ext3(); 4327 unregister_filesystem(&ext4_fs_type); 4328 destroy_inodecache(); 4329 exit_ext4_xattr(); 4330 exit_ext4_mballoc(); 4331 remove_proc_entry("fs/ext4", NULL); 4332 kset_unregister(ext4_kset); 4333 exit_ext4_system_zone(); 4334 } 4335 4336 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 4337 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 4338 MODULE_LICENSE("GPL"); 4339 module_init(init_ext4_fs) 4340 module_exit(exit_ext4_fs) 4341