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/smp_lock.h> 30#include <linux/buffer_head.h> 31#include <linux/exportfs.h> 32#include <linux/vfs.h> 33#include <linux/random.h> 34#include <linux/mount.h> 35#include <linux/namei.h> 36#include <linux/quotaops.h> 37#include <linux/seq_file.h> 38#include <linux/proc_fs.h> 39#include <linux/ctype.h> 40#include <linux/log2.h> 41#include <linux/crc16.h> 42#include <asm/uaccess.h> 43 44#include "ext4.h" 45#include "ext4_jbd2.h" 46#include "xattr.h" 47#include "acl.h" 48#include "mballoc.h" 49 50#define CREATE_TRACE_POINTS 51#include <trace/events/ext4.h> 52 53struct proc_dir_entry *ext4_proc_root; 54static struct kset *ext4_kset; 55 56static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 57 unsigned long journal_devnum); 58static int ext4_commit_super(struct super_block *sb, int sync); 59static void ext4_mark_recovery_complete(struct super_block *sb, 60 struct ext4_super_block *es); 61static void ext4_clear_journal_err(struct super_block *sb, 62 struct ext4_super_block *es); 63static int ext4_sync_fs(struct super_block *sb, int wait); 64static const char *ext4_decode_error(struct super_block *sb, int errno, 65 char nbuf[16]); 66static int ext4_remount(struct super_block *sb, int *flags, char *data); 67static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 68static int ext4_unfreeze(struct super_block *sb); 69static void ext4_write_super(struct super_block *sb); 70static int ext4_freeze(struct super_block *sb); 71static int ext4_get_sb(struct file_system_type *fs_type, int flags, 72 const char *dev_name, void *data, struct vfsmount *mnt); 73 74#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && \ 75 defined(CONFIG_EXT4_USE_FOR_EXT23) 76static struct file_system_type ext3_fs_type = { 77 .owner = THIS_MODULE, 78 .name = "ext3", 79 .get_sb = ext4_get_sb, 80 .kill_sb = kill_block_super, 81 .fs_flags = FS_REQUIRES_DEV, 82}; 83#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 84#else 85#define IS_EXT3_SB(sb) (0) 86#endif 87 88ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 89 struct ext4_group_desc *bg) 90{ 91 return le32_to_cpu(bg->bg_block_bitmap_lo) | 92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 93 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 94} 95 96ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 97 struct ext4_group_desc *bg) 98{ 99 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 100 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 101 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 102} 103 104ext4_fsblk_t ext4_inode_table(struct super_block *sb, 105 struct ext4_group_desc *bg) 106{ 107 return le32_to_cpu(bg->bg_inode_table_lo) | 108 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 109 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 110} 111 112__u32 ext4_free_blks_count(struct super_block *sb, 113 struct ext4_group_desc *bg) 114{ 115 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 116 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 117 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 118} 119 120__u32 ext4_free_inodes_count(struct super_block *sb, 121 struct ext4_group_desc *bg) 122{ 123 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 124 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 125 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 126} 127 128__u32 ext4_used_dirs_count(struct super_block *sb, 129 struct ext4_group_desc *bg) 130{ 131 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 132 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 133 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 134} 135 136__u32 ext4_itable_unused_count(struct super_block *sb, 137 struct ext4_group_desc *bg) 138{ 139 return le16_to_cpu(bg->bg_itable_unused_lo) | 140 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 141 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 142} 143 144void ext4_block_bitmap_set(struct super_block *sb, 145 struct ext4_group_desc *bg, ext4_fsblk_t blk) 146{ 147 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 148 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 149 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 150} 151 152void ext4_inode_bitmap_set(struct super_block *sb, 153 struct ext4_group_desc *bg, ext4_fsblk_t blk) 154{ 155 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 156 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 157 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 158} 159 160void ext4_inode_table_set(struct super_block *sb, 161 struct ext4_group_desc *bg, ext4_fsblk_t blk) 162{ 163 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 164 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 165 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 166} 167 168void ext4_free_blks_set(struct super_block *sb, 169 struct ext4_group_desc *bg, __u32 count) 170{ 171 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 172 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 173 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 174} 175 176void ext4_free_inodes_set(struct super_block *sb, 177 struct ext4_group_desc *bg, __u32 count) 178{ 179 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 180 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 181 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 182} 183 184void ext4_used_dirs_set(struct super_block *sb, 185 struct ext4_group_desc *bg, __u32 count) 186{ 187 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 188 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 189 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 190} 191 192void ext4_itable_unused_set(struct super_block *sb, 193 struct ext4_group_desc *bg, __u32 count) 194{ 195 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 196 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 197 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 198} 199 200 201/* Just increment the non-pointer handle value */ 202static handle_t *ext4_get_nojournal(void) 203{ 204 handle_t *handle = current->journal_info; 205 unsigned long ref_cnt = (unsigned long)handle; 206 207 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); 208 209 ref_cnt++; 210 handle = (handle_t *)ref_cnt; 211 212 current->journal_info = handle; 213 return handle; 214} 215 216 217/* Decrement the non-pointer handle value */ 218static void ext4_put_nojournal(handle_t *handle) 219{ 220 unsigned long ref_cnt = (unsigned long)handle; 221 222 BUG_ON(ref_cnt == 0); 223 224 ref_cnt--; 225 handle = (handle_t *)ref_cnt; 226 227 current->journal_info = handle; 228} 229 230/* 231 * Wrappers for jbd2_journal_start/end. 232 * 233 * The only special thing we need to do here is to make sure that all 234 * journal_end calls result in the superblock being marked dirty, so 235 * that sync() will call the filesystem's write_super callback if 236 * appropriate. 237 */ 238handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 239{ 240 journal_t *journal; 241 242 if (sb->s_flags & MS_RDONLY) 243 return ERR_PTR(-EROFS); 244 245 vfs_check_frozen(sb, SB_FREEZE_TRANS); 246 /* Special case here: if the journal has aborted behind our 247 * backs (eg. EIO in the commit thread), then we still need to 248 * take the FS itself readonly cleanly. */ 249 journal = EXT4_SB(sb)->s_journal; 250 if (journal) { 251 if (is_journal_aborted(journal)) { 252 ext4_abort(sb, "Detected aborted journal"); 253 return ERR_PTR(-EROFS); 254 } 255 return jbd2_journal_start(journal, nblocks); 256 } 257 return ext4_get_nojournal(); 258} 259 260/* 261 * The only special thing we need to do here is to make sure that all 262 * jbd2_journal_stop calls result in the superblock being marked dirty, so 263 * that sync() will call the filesystem's write_super callback if 264 * appropriate. 265 */ 266int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) 267{ 268 struct super_block *sb; 269 int err; 270 int rc; 271 272 if (!ext4_handle_valid(handle)) { 273 ext4_put_nojournal(handle); 274 return 0; 275 } 276 sb = handle->h_transaction->t_journal->j_private; 277 err = handle->h_err; 278 rc = jbd2_journal_stop(handle); 279 280 if (!err) 281 err = rc; 282 if (err) 283 __ext4_std_error(sb, where, line, err); 284 return err; 285} 286 287void ext4_journal_abort_handle(const char *caller, unsigned int line, 288 const char *err_fn, struct buffer_head *bh, 289 handle_t *handle, int err) 290{ 291 char nbuf[16]; 292 const char *errstr = ext4_decode_error(NULL, err, nbuf); 293 294 BUG_ON(!ext4_handle_valid(handle)); 295 296 if (bh) 297 BUFFER_TRACE(bh, "abort"); 298 299 if (!handle->h_err) 300 handle->h_err = err; 301 302 if (is_handle_aborted(handle)) 303 return; 304 305 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n", 306 caller, line, errstr, err_fn); 307 308 jbd2_journal_abort_handle(handle); 309} 310 311static void __save_error_info(struct super_block *sb, const char *func, 312 unsigned int line) 313{ 314 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 315 316 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 317 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 318 es->s_last_error_time = cpu_to_le32(get_seconds()); 319 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 320 es->s_last_error_line = cpu_to_le32(line); 321 if (!es->s_first_error_time) { 322 es->s_first_error_time = es->s_last_error_time; 323 strncpy(es->s_first_error_func, func, 324 sizeof(es->s_first_error_func)); 325 es->s_first_error_line = cpu_to_le32(line); 326 es->s_first_error_ino = es->s_last_error_ino; 327 es->s_first_error_block = es->s_last_error_block; 328 } 329 /* 330 * Start the daily error reporting function if it hasn't been 331 * started already 332 */ 333 if (!es->s_error_count) 334 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 335 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); 336} 337 338static void save_error_info(struct super_block *sb, const char *func, 339 unsigned int line) 340{ 341 __save_error_info(sb, func, line); 342 ext4_commit_super(sb, 1); 343} 344 345 346/* Deal with the reporting of failure conditions on a filesystem such as 347 * inconsistencies detected or read IO failures. 348 * 349 * On ext2, we can store the error state of the filesystem in the 350 * superblock. That is not possible on ext4, because we may have other 351 * write ordering constraints on the superblock which prevent us from 352 * writing it out straight away; and given that the journal is about to 353 * be aborted, we can't rely on the current, or future, transactions to 354 * write out the superblock safely. 355 * 356 * We'll just use the jbd2_journal_abort() error code to record an error in 357 * the journal instead. On recovery, the journal will complain about 358 * that error until we've noted it down and cleared it. 359 */ 360 361static void ext4_handle_error(struct super_block *sb) 362{ 363 if (sb->s_flags & MS_RDONLY) 364 return; 365 366 if (!test_opt(sb, ERRORS_CONT)) { 367 journal_t *journal = EXT4_SB(sb)->s_journal; 368 369 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 370 if (journal) 371 jbd2_journal_abort(journal, -EIO); 372 } 373 if (test_opt(sb, ERRORS_RO)) { 374 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 375 sb->s_flags |= MS_RDONLY; 376 } 377 if (test_opt(sb, ERRORS_PANIC)) 378 panic("EXT4-fs (device %s): panic forced after error\n", 379 sb->s_id); 380} 381 382void __ext4_error(struct super_block *sb, const char *function, 383 unsigned int line, const char *fmt, ...) 384{ 385 va_list args; 386 387 va_start(args, fmt); 388 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ", 389 sb->s_id, function, line, current->comm); 390 vprintk(fmt, args); 391 printk("\n"); 392 va_end(args); 393 394 ext4_handle_error(sb); 395} 396 397void ext4_error_inode(struct inode *inode, const char *function, 398 unsigned int line, ext4_fsblk_t block, 399 const char *fmt, ...) 400{ 401 va_list args; 402 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 403 404 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 405 es->s_last_error_block = cpu_to_le64(block); 406 save_error_info(inode->i_sb, function, line); 407 va_start(args, fmt); 408 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ", 409 inode->i_sb->s_id, function, line, inode->i_ino); 410 if (block) 411 printk("block %llu: ", block); 412 printk("comm %s: ", current->comm); 413 vprintk(fmt, args); 414 printk("\n"); 415 va_end(args); 416 417 ext4_handle_error(inode->i_sb); 418} 419 420void ext4_error_file(struct file *file, const char *function, 421 unsigned int line, const char *fmt, ...) 422{ 423 va_list args; 424 struct ext4_super_block *es; 425 struct inode *inode = file->f_dentry->d_inode; 426 char pathname[80], *path; 427 428 es = EXT4_SB(inode->i_sb)->s_es; 429 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 430 save_error_info(inode->i_sb, function, line); 431 va_start(args, fmt); 432 path = d_path(&(file->f_path), pathname, sizeof(pathname)); 433 if (!path) 434 path = "(unknown)"; 435 printk(KERN_CRIT 436 "EXT4-fs error (device %s): %s:%d: inode #%lu " 437 "(comm %s path %s): ", 438 inode->i_sb->s_id, function, line, inode->i_ino, 439 current->comm, path); 440 vprintk(fmt, args); 441 printk("\n"); 442 va_end(args); 443 444 ext4_handle_error(inode->i_sb); 445} 446 447static const char *ext4_decode_error(struct super_block *sb, int errno, 448 char nbuf[16]) 449{ 450 char *errstr = NULL; 451 452 switch (errno) { 453 case -EIO: 454 errstr = "IO failure"; 455 break; 456 case -ENOMEM: 457 errstr = "Out of memory"; 458 break; 459 case -EROFS: 460 if (!sb || (EXT4_SB(sb)->s_journal && 461 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 462 errstr = "Journal has aborted"; 463 else 464 errstr = "Readonly filesystem"; 465 break; 466 default: 467 /* If the caller passed in an extra buffer for unknown 468 * errors, textualise them now. Else we just return 469 * NULL. */ 470 if (nbuf) { 471 /* Check for truncated error codes... */ 472 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 473 errstr = nbuf; 474 } 475 break; 476 } 477 478 return errstr; 479} 480 481/* __ext4_std_error decodes expected errors from journaling functions 482 * automatically and invokes the appropriate error response. */ 483 484void __ext4_std_error(struct super_block *sb, const char *function, 485 unsigned int line, int errno) 486{ 487 char nbuf[16]; 488 const char *errstr; 489 490 /* Special case: if the error is EROFS, and we're not already 491 * inside a transaction, then there's really no point in logging 492 * an error. */ 493 if (errno == -EROFS && journal_current_handle() == NULL && 494 (sb->s_flags & MS_RDONLY)) 495 return; 496 497 errstr = ext4_decode_error(sb, errno, nbuf); 498 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 499 sb->s_id, function, line, errstr); 500 save_error_info(sb, function, line); 501 502 ext4_handle_error(sb); 503} 504 505/* 506 * ext4_abort is a much stronger failure handler than ext4_error. The 507 * abort function may be used to deal with unrecoverable failures such 508 * as journal IO errors or ENOMEM at a critical moment in log management. 509 * 510 * We unconditionally force the filesystem into an ABORT|READONLY state, 511 * unless the error response on the fs has been set to panic in which 512 * case we take the easy way out and panic immediately. 513 */ 514 515void __ext4_abort(struct super_block *sb, const char *function, 516 unsigned int line, const char *fmt, ...) 517{ 518 va_list args; 519 520 save_error_info(sb, function, line); 521 va_start(args, fmt); 522 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 523 function, line); 524 vprintk(fmt, args); 525 printk("\n"); 526 va_end(args); 527 528 if ((sb->s_flags & MS_RDONLY) == 0) { 529 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 530 sb->s_flags |= MS_RDONLY; 531 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 532 if (EXT4_SB(sb)->s_journal) 533 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 534 save_error_info(sb, function, line); 535 } 536 if (test_opt(sb, ERRORS_PANIC)) 537 panic("EXT4-fs panic from previous error\n"); 538} 539 540void ext4_msg (struct super_block * sb, const char *prefix, 541 const char *fmt, ...) 542{ 543 va_list args; 544 545 va_start(args, fmt); 546 printk("%sEXT4-fs (%s): ", prefix, sb->s_id); 547 vprintk(fmt, args); 548 printk("\n"); 549 va_end(args); 550} 551 552void __ext4_warning(struct super_block *sb, const char *function, 553 unsigned int line, const char *fmt, ...) 554{ 555 va_list args; 556 557 va_start(args, fmt); 558 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ", 559 sb->s_id, function, line); 560 vprintk(fmt, args); 561 printk("\n"); 562 va_end(args); 563} 564 565void __ext4_grp_locked_error(const char *function, unsigned int line, 566 struct super_block *sb, ext4_group_t grp, 567 unsigned long ino, ext4_fsblk_t block, 568 const char *fmt, ...) 569__releases(bitlock) 570__acquires(bitlock) 571{ 572 va_list args; 573 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 574 575 es->s_last_error_ino = cpu_to_le32(ino); 576 es->s_last_error_block = cpu_to_le64(block); 577 __save_error_info(sb, function, line); 578 va_start(args, fmt); 579 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u", 580 sb->s_id, function, line, grp); 581 if (ino) 582 printk("inode %lu: ", ino); 583 if (block) 584 printk("block %llu:", (unsigned long long) block); 585 vprintk(fmt, args); 586 printk("\n"); 587 va_end(args); 588 589 if (test_opt(sb, ERRORS_CONT)) { 590 ext4_commit_super(sb, 0); 591 return; 592 } 593 594 ext4_unlock_group(sb, grp); 595 ext4_handle_error(sb); 596 /* 597 * We only get here in the ERRORS_RO case; relocking the group 598 * may be dangerous, but nothing bad will happen since the 599 * filesystem will have already been marked read/only and the 600 * journal has been aborted. We return 1 as a hint to callers 601 * who might what to use the return value from 602 * ext4_grp_locked_error() to distinguish beween the 603 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 604 * aggressively from the ext4 function in question, with a 605 * more appropriate error code. 606 */ 607 ext4_lock_group(sb, grp); 608 return; 609} 610 611void ext4_update_dynamic_rev(struct super_block *sb) 612{ 613 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 614 615 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 616 return; 617 618 ext4_warning(sb, 619 "updating to rev %d because of new feature flag, " 620 "running e2fsck is recommended", 621 EXT4_DYNAMIC_REV); 622 623 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 624 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 625 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 626 /* leave es->s_feature_*compat flags alone */ 627 /* es->s_uuid will be set by e2fsck if empty */ 628 629 /* 630 * The rest of the superblock fields should be zero, and if not it 631 * means they are likely already in use, so leave them alone. We 632 * can leave it up to e2fsck to clean up any inconsistencies there. 633 */ 634} 635 636/* 637 * Open the external journal device 638 */ 639static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 640{ 641 struct block_device *bdev; 642 char b[BDEVNAME_SIZE]; 643 644 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 645 if (IS_ERR(bdev)) 646 goto fail; 647 return bdev; 648 649fail: 650 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 651 __bdevname(dev, b), PTR_ERR(bdev)); 652 return NULL; 653} 654 655/* 656 * Release the journal device 657 */ 658static int ext4_blkdev_put(struct block_device *bdev) 659{ 660 bd_release(bdev); 661 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 662} 663 664static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 665{ 666 struct block_device *bdev; 667 int ret = -ENODEV; 668 669 bdev = sbi->journal_bdev; 670 if (bdev) { 671 ret = ext4_blkdev_put(bdev); 672 sbi->journal_bdev = NULL; 673 } 674 return ret; 675} 676 677static inline struct inode *orphan_list_entry(struct list_head *l) 678{ 679 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 680} 681 682static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 683{ 684 struct list_head *l; 685 686 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 687 le32_to_cpu(sbi->s_es->s_last_orphan)); 688 689 printk(KERN_ERR "sb_info orphan list:\n"); 690 list_for_each(l, &sbi->s_orphan) { 691 struct inode *inode = orphan_list_entry(l); 692 printk(KERN_ERR " " 693 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 694 inode->i_sb->s_id, inode->i_ino, inode, 695 inode->i_mode, inode->i_nlink, 696 NEXT_ORPHAN(inode)); 697 } 698} 699 700static void ext4_put_super(struct super_block *sb) 701{ 702 struct ext4_sb_info *sbi = EXT4_SB(sb); 703 struct ext4_super_block *es = sbi->s_es; 704 int i, err; 705 706 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 707 708 flush_workqueue(sbi->dio_unwritten_wq); 709 destroy_workqueue(sbi->dio_unwritten_wq); 710 711 lock_super(sb); 712 lock_kernel(); 713 if (sb->s_dirt) 714 ext4_commit_super(sb, 1); 715 716 if (sbi->s_journal) { 717 err = jbd2_journal_destroy(sbi->s_journal); 718 sbi->s_journal = NULL; 719 if (err < 0) 720 ext4_abort(sb, "Couldn't clean up the journal"); 721 } 722 723 del_timer(&sbi->s_err_report); 724 ext4_release_system_zone(sb); 725 ext4_mb_release(sb); 726 ext4_ext_release(sb); 727 ext4_xattr_put_super(sb); 728 729 if (!(sb->s_flags & MS_RDONLY)) { 730 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 731 es->s_state = cpu_to_le16(sbi->s_mount_state); 732 ext4_commit_super(sb, 1); 733 } 734 if (sbi->s_proc) { 735 remove_proc_entry(sb->s_id, ext4_proc_root); 736 } 737 kobject_del(&sbi->s_kobj); 738 739 for (i = 0; i < sbi->s_gdb_count; i++) 740 brelse(sbi->s_group_desc[i]); 741 kfree(sbi->s_group_desc); 742 if (is_vmalloc_addr(sbi->s_flex_groups)) 743 vfree(sbi->s_flex_groups); 744 else 745 kfree(sbi->s_flex_groups); 746 percpu_counter_destroy(&sbi->s_freeblocks_counter); 747 percpu_counter_destroy(&sbi->s_freeinodes_counter); 748 percpu_counter_destroy(&sbi->s_dirs_counter); 749 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 750 brelse(sbi->s_sbh); 751#ifdef CONFIG_QUOTA 752 for (i = 0; i < MAXQUOTAS; i++) 753 kfree(sbi->s_qf_names[i]); 754#endif 755 756 /* Debugging code just in case the in-memory inode orphan list 757 * isn't empty. The on-disk one can be non-empty if we've 758 * detected an error and taken the fs readonly, but the 759 * in-memory list had better be clean by this point. */ 760 if (!list_empty(&sbi->s_orphan)) 761 dump_orphan_list(sb, sbi); 762 J_ASSERT(list_empty(&sbi->s_orphan)); 763 764 invalidate_bdev(sb->s_bdev); 765 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 766 /* 767 * Invalidate the journal device's buffers. We don't want them 768 * floating about in memory - the physical journal device may 769 * hotswapped, and it breaks the `ro-after' testing code. 770 */ 771 sync_blockdev(sbi->journal_bdev); 772 invalidate_bdev(sbi->journal_bdev); 773 ext4_blkdev_remove(sbi); 774 } 775 sb->s_fs_info = NULL; 776 /* 777 * Now that we are completely done shutting down the 778 * superblock, we need to actually destroy the kobject. 779 */ 780 unlock_kernel(); 781 unlock_super(sb); 782 kobject_put(&sbi->s_kobj); 783 wait_for_completion(&sbi->s_kobj_unregister); 784 kfree(sbi->s_blockgroup_lock); 785 kfree(sbi); 786} 787 788static struct kmem_cache *ext4_inode_cachep; 789 790/* 791 * Called inside transaction, so use GFP_NOFS 792 */ 793static struct inode *ext4_alloc_inode(struct super_block *sb) 794{ 795 struct ext4_inode_info *ei; 796 797 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 798 if (!ei) 799 return NULL; 800 801 ei->vfs_inode.i_version = 1; 802 ei->vfs_inode.i_data.writeback_index = 0; 803 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 804 INIT_LIST_HEAD(&ei->i_prealloc_list); 805 spin_lock_init(&ei->i_prealloc_lock); 806 /* 807 * Note: We can be called before EXT4_SB(sb)->s_journal is set, 808 * therefore it can be null here. Don't check it, just initialize 809 * jinode. 810 */ 811 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 812 ei->i_reserved_data_blocks = 0; 813 ei->i_reserved_meta_blocks = 0; 814 ei->i_allocated_meta_blocks = 0; 815 ei->i_da_metadata_calc_len = 0; 816 ei->i_delalloc_reserved_flag = 0; 817 spin_lock_init(&(ei->i_block_reservation_lock)); 818#ifdef CONFIG_QUOTA 819 ei->i_reserved_quota = 0; 820#endif 821 INIT_LIST_HEAD(&ei->i_completed_io_list); 822 spin_lock_init(&ei->i_completed_io_lock); 823 ei->cur_aio_dio = NULL; 824 ei->i_sync_tid = 0; 825 ei->i_datasync_tid = 0; 826 827 return &ei->vfs_inode; 828} 829 830static void ext4_destroy_inode(struct inode *inode) 831{ 832 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 833 ext4_msg(inode->i_sb, KERN_ERR, 834 "Inode %lu (%p): orphan list check failed!", 835 inode->i_ino, EXT4_I(inode)); 836 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 837 EXT4_I(inode), sizeof(struct ext4_inode_info), 838 true); 839 dump_stack(); 840 } 841 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 842} 843 844static void init_once(void *foo) 845{ 846 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 847 848 INIT_LIST_HEAD(&ei->i_orphan); 849#ifdef CONFIG_EXT4_FS_XATTR 850 init_rwsem(&ei->xattr_sem); 851#endif 852 init_rwsem(&ei->i_data_sem); 853 inode_init_once(&ei->vfs_inode); 854} 855 856static int init_inodecache(void) 857{ 858 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 859 sizeof(struct ext4_inode_info), 860 0, (SLAB_RECLAIM_ACCOUNT| 861 SLAB_MEM_SPREAD), 862 init_once); 863 if (ext4_inode_cachep == NULL) 864 return -ENOMEM; 865 return 0; 866} 867 868static void destroy_inodecache(void) 869{ 870 kmem_cache_destroy(ext4_inode_cachep); 871} 872 873void ext4_clear_inode(struct inode *inode) 874{ 875 invalidate_inode_buffers(inode); 876 end_writeback(inode); 877 dquot_drop(inode); 878 ext4_discard_preallocations(inode); 879 if (EXT4_JOURNAL(inode)) 880 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 881 &EXT4_I(inode)->jinode); 882} 883 884static inline void ext4_show_quota_options(struct seq_file *seq, 885 struct super_block *sb) 886{ 887#if defined(CONFIG_QUOTA) 888 struct ext4_sb_info *sbi = EXT4_SB(sb); 889 890 if (sbi->s_jquota_fmt) { 891 char *fmtname = ""; 892 893 switch (sbi->s_jquota_fmt) { 894 case QFMT_VFS_OLD: 895 fmtname = "vfsold"; 896 break; 897 case QFMT_VFS_V0: 898 fmtname = "vfsv0"; 899 break; 900 case QFMT_VFS_V1: 901 fmtname = "vfsv1"; 902 break; 903 } 904 seq_printf(seq, ",jqfmt=%s", fmtname); 905 } 906 907 if (sbi->s_qf_names[USRQUOTA]) 908 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 909 910 if (sbi->s_qf_names[GRPQUOTA]) 911 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 912 913 if (test_opt(sb, USRQUOTA)) 914 seq_puts(seq, ",usrquota"); 915 916 if (test_opt(sb, GRPQUOTA)) 917 seq_puts(seq, ",grpquota"); 918#endif 919} 920 921/* 922 * Show an option if 923 * - it's set to a non-default value OR 924 * - if the per-sb default is different from the global default 925 */ 926static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 927{ 928 int def_errors; 929 unsigned long def_mount_opts; 930 struct super_block *sb = vfs->mnt_sb; 931 struct ext4_sb_info *sbi = EXT4_SB(sb); 932 struct ext4_super_block *es = sbi->s_es; 933 934 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 935 def_errors = le16_to_cpu(es->s_errors); 936 937 if (sbi->s_sb_block != 1) 938 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 939 if (test_opt(sb, MINIX_DF)) 940 seq_puts(seq, ",minixdf"); 941 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 942 seq_puts(seq, ",grpid"); 943 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 944 seq_puts(seq, ",nogrpid"); 945 if (sbi->s_resuid != EXT4_DEF_RESUID || 946 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 947 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 948 } 949 if (sbi->s_resgid != EXT4_DEF_RESGID || 950 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 951 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 952 } 953 if (test_opt(sb, ERRORS_RO)) { 954 if (def_errors == EXT4_ERRORS_PANIC || 955 def_errors == EXT4_ERRORS_CONTINUE) { 956 seq_puts(seq, ",errors=remount-ro"); 957 } 958 } 959 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 960 seq_puts(seq, ",errors=continue"); 961 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 962 seq_puts(seq, ",errors=panic"); 963 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 964 seq_puts(seq, ",nouid32"); 965 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 966 seq_puts(seq, ",debug"); 967 if (test_opt(sb, OLDALLOC)) 968 seq_puts(seq, ",oldalloc"); 969#ifdef CONFIG_EXT4_FS_XATTR 970 if (test_opt(sb, XATTR_USER) && 971 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 972 seq_puts(seq, ",user_xattr"); 973 if (!test_opt(sb, XATTR_USER) && 974 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 975 seq_puts(seq, ",nouser_xattr"); 976 } 977#endif 978#ifdef CONFIG_EXT4_FS_POSIX_ACL 979 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 980 seq_puts(seq, ",acl"); 981 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 982 seq_puts(seq, ",noacl"); 983#endif 984 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 985 seq_printf(seq, ",commit=%u", 986 (unsigned) (sbi->s_commit_interval / HZ)); 987 } 988 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 989 seq_printf(seq, ",min_batch_time=%u", 990 (unsigned) sbi->s_min_batch_time); 991 } 992 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 993 seq_printf(seq, ",max_batch_time=%u", 994 (unsigned) sbi->s_min_batch_time); 995 } 996 997 /* 998 * We're changing the default of barrier mount option, so 999 * let's always display its mount state so it's clear what its 1000 * status is. 1001 */ 1002 seq_puts(seq, ",barrier="); 1003 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 1004 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 1005 seq_puts(seq, ",journal_async_commit"); 1006 else if (test_opt(sb, JOURNAL_CHECKSUM)) 1007 seq_puts(seq, ",journal_checksum"); 1008 if (test_opt(sb, I_VERSION)) 1009 seq_puts(seq, ",i_version"); 1010 if (!test_opt(sb, DELALLOC) && 1011 !(def_mount_opts & EXT4_DEFM_NODELALLOC)) 1012 seq_puts(seq, ",nodelalloc"); 1013 1014 if (sbi->s_stripe) 1015 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 1016 /* 1017 * journal mode get enabled in different ways 1018 * So just print the value even if we didn't specify it 1019 */ 1020 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1021 seq_puts(seq, ",data=journal"); 1022 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1023 seq_puts(seq, ",data=ordered"); 1024 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1025 seq_puts(seq, ",data=writeback"); 1026 1027 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1028 seq_printf(seq, ",inode_readahead_blks=%u", 1029 sbi->s_inode_readahead_blks); 1030 1031 if (test_opt(sb, DATA_ERR_ABORT)) 1032 seq_puts(seq, ",data_err=abort"); 1033 1034 if (test_opt(sb, NO_AUTO_DA_ALLOC)) 1035 seq_puts(seq, ",noauto_da_alloc"); 1036 1037 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) 1038 seq_puts(seq, ",discard"); 1039 1040 if (test_opt(sb, NOLOAD)) 1041 seq_puts(seq, ",norecovery"); 1042 1043 if (test_opt(sb, DIOREAD_NOLOCK)) 1044 seq_puts(seq, ",dioread_nolock"); 1045 1046 if (test_opt(sb, BLOCK_VALIDITY) && 1047 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)) 1048 seq_puts(seq, ",block_validity"); 1049 1050 ext4_show_quota_options(seq, sb); 1051 1052 return 0; 1053} 1054 1055static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1056 u64 ino, u32 generation) 1057{ 1058 struct inode *inode; 1059 1060 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1061 return ERR_PTR(-ESTALE); 1062 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1063 return ERR_PTR(-ESTALE); 1064 1065 /* iget isn't really right if the inode is currently unallocated!! 1066 * 1067 * ext4_read_inode will return a bad_inode if the inode had been 1068 * deleted, so we should be safe. 1069 * 1070 * Currently we don't know the generation for parent directory, so 1071 * a generation of 0 means "accept any" 1072 */ 1073 inode = ext4_iget(sb, ino); 1074 if (IS_ERR(inode)) 1075 return ERR_CAST(inode); 1076 if (generation && inode->i_generation != generation) { 1077 iput(inode); 1078 return ERR_PTR(-ESTALE); 1079 } 1080 1081 return inode; 1082} 1083 1084static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1085 int fh_len, int fh_type) 1086{ 1087 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1088 ext4_nfs_get_inode); 1089} 1090 1091static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1092 int fh_len, int fh_type) 1093{ 1094 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1095 ext4_nfs_get_inode); 1096} 1097 1098/* 1099 * Try to release metadata pages (indirect blocks, directories) which are 1100 * mapped via the block device. Since these pages could have journal heads 1101 * which would prevent try_to_free_buffers() from freeing them, we must use 1102 * jbd2 layer's try_to_free_buffers() function to release them. 1103 */ 1104static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1105 gfp_t wait) 1106{ 1107 journal_t *journal = EXT4_SB(sb)->s_journal; 1108 1109 WARN_ON(PageChecked(page)); 1110 if (!page_has_buffers(page)) 1111 return 0; 1112 if (journal) 1113 return jbd2_journal_try_to_free_buffers(journal, page, 1114 wait & ~__GFP_WAIT); 1115 return try_to_free_buffers(page); 1116} 1117 1118#ifdef CONFIG_QUOTA 1119#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 1120#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 1121 1122static int ext4_write_dquot(struct dquot *dquot); 1123static int ext4_acquire_dquot(struct dquot *dquot); 1124static int ext4_release_dquot(struct dquot *dquot); 1125static int ext4_mark_dquot_dirty(struct dquot *dquot); 1126static int ext4_write_info(struct super_block *sb, int type); 1127static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1128 char *path); 1129static int ext4_quota_off(struct super_block *sb, int type); 1130static int ext4_quota_on_mount(struct super_block *sb, int type); 1131static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1132 size_t len, loff_t off); 1133static ssize_t ext4_quota_write(struct super_block *sb, int type, 1134 const char *data, size_t len, loff_t off); 1135 1136static const struct dquot_operations ext4_quota_operations = { 1137#ifdef CONFIG_QUOTA 1138 .get_reserved_space = ext4_get_reserved_space, 1139#endif 1140 .write_dquot = ext4_write_dquot, 1141 .acquire_dquot = ext4_acquire_dquot, 1142 .release_dquot = ext4_release_dquot, 1143 .mark_dirty = ext4_mark_dquot_dirty, 1144 .write_info = ext4_write_info, 1145 .alloc_dquot = dquot_alloc, 1146 .destroy_dquot = dquot_destroy, 1147}; 1148 1149static const struct quotactl_ops ext4_qctl_operations = { 1150 .quota_on = ext4_quota_on, 1151 .quota_off = ext4_quota_off, 1152 .quota_sync = dquot_quota_sync, 1153 .get_info = dquot_get_dqinfo, 1154 .set_info = dquot_set_dqinfo, 1155 .get_dqblk = dquot_get_dqblk, 1156 .set_dqblk = dquot_set_dqblk 1157}; 1158#endif 1159 1160static const struct super_operations ext4_sops = { 1161 .alloc_inode = ext4_alloc_inode, 1162 .destroy_inode = ext4_destroy_inode, 1163 .write_inode = ext4_write_inode, 1164 .dirty_inode = ext4_dirty_inode, 1165 .evict_inode = ext4_evict_inode, 1166 .put_super = ext4_put_super, 1167 .sync_fs = ext4_sync_fs, 1168 .freeze_fs = ext4_freeze, 1169 .unfreeze_fs = ext4_unfreeze, 1170 .statfs = ext4_statfs, 1171 .remount_fs = ext4_remount, 1172 .show_options = ext4_show_options, 1173#ifdef CONFIG_QUOTA 1174 .quota_read = ext4_quota_read, 1175 .quota_write = ext4_quota_write, 1176#endif 1177 .bdev_try_to_free_page = bdev_try_to_free_page, 1178}; 1179 1180static const struct super_operations ext4_nojournal_sops = { 1181 .alloc_inode = ext4_alloc_inode, 1182 .destroy_inode = ext4_destroy_inode, 1183 .write_inode = ext4_write_inode, 1184 .dirty_inode = ext4_dirty_inode, 1185 .evict_inode = ext4_evict_inode, 1186 .write_super = ext4_write_super, 1187 .put_super = ext4_put_super, 1188 .statfs = ext4_statfs, 1189 .remount_fs = ext4_remount, 1190 .show_options = ext4_show_options, 1191#ifdef CONFIG_QUOTA 1192 .quota_read = ext4_quota_read, 1193 .quota_write = ext4_quota_write, 1194#endif 1195 .bdev_try_to_free_page = bdev_try_to_free_page, 1196}; 1197 1198static const struct export_operations ext4_export_ops = { 1199 .fh_to_dentry = ext4_fh_to_dentry, 1200 .fh_to_parent = ext4_fh_to_parent, 1201 .get_parent = ext4_get_parent, 1202}; 1203 1204enum { 1205 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1206 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1207 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, 1208 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1209 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh, 1210 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1211 Opt_journal_update, Opt_journal_dev, 1212 Opt_journal_checksum, Opt_journal_async_commit, 1213 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1214 Opt_data_err_abort, Opt_data_err_ignore, 1215 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1216 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1217 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, 1218 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version, 1219 Opt_stripe, Opt_delalloc, Opt_nodelalloc, 1220 Opt_block_validity, Opt_noblock_validity, 1221 Opt_inode_readahead_blks, Opt_journal_ioprio, 1222 Opt_dioread_nolock, Opt_dioread_lock, 1223 Opt_discard, Opt_nodiscard, 1224}; 1225 1226static const match_table_t tokens = { 1227 {Opt_bsd_df, "bsddf"}, 1228 {Opt_minix_df, "minixdf"}, 1229 {Opt_grpid, "grpid"}, 1230 {Opt_grpid, "bsdgroups"}, 1231 {Opt_nogrpid, "nogrpid"}, 1232 {Opt_nogrpid, "sysvgroups"}, 1233 {Opt_resgid, "resgid=%u"}, 1234 {Opt_resuid, "resuid=%u"}, 1235 {Opt_sb, "sb=%u"}, 1236 {Opt_err_cont, "errors=continue"}, 1237 {Opt_err_panic, "errors=panic"}, 1238 {Opt_err_ro, "errors=remount-ro"}, 1239 {Opt_nouid32, "nouid32"}, 1240 {Opt_debug, "debug"}, 1241 {Opt_oldalloc, "oldalloc"}, 1242 {Opt_orlov, "orlov"}, 1243 {Opt_user_xattr, "user_xattr"}, 1244 {Opt_nouser_xattr, "nouser_xattr"}, 1245 {Opt_acl, "acl"}, 1246 {Opt_noacl, "noacl"}, 1247 {Opt_noload, "noload"}, 1248 {Opt_noload, "norecovery"}, 1249 {Opt_nobh, "nobh"}, 1250 {Opt_bh, "bh"}, 1251 {Opt_commit, "commit=%u"}, 1252 {Opt_min_batch_time, "min_batch_time=%u"}, 1253 {Opt_max_batch_time, "max_batch_time=%u"}, 1254 {Opt_journal_update, "journal=update"}, 1255 {Opt_journal_dev, "journal_dev=%u"}, 1256 {Opt_journal_checksum, "journal_checksum"}, 1257 {Opt_journal_async_commit, "journal_async_commit"}, 1258 {Opt_abort, "abort"}, 1259 {Opt_data_journal, "data=journal"}, 1260 {Opt_data_ordered, "data=ordered"}, 1261 {Opt_data_writeback, "data=writeback"}, 1262 {Opt_data_err_abort, "data_err=abort"}, 1263 {Opt_data_err_ignore, "data_err=ignore"}, 1264 {Opt_offusrjquota, "usrjquota="}, 1265 {Opt_usrjquota, "usrjquota=%s"}, 1266 {Opt_offgrpjquota, "grpjquota="}, 1267 {Opt_grpjquota, "grpjquota=%s"}, 1268 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1269 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1270 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1271 {Opt_grpquota, "grpquota"}, 1272 {Opt_noquota, "noquota"}, 1273 {Opt_quota, "quota"}, 1274 {Opt_usrquota, "usrquota"}, 1275 {Opt_barrier, "barrier=%u"}, 1276 {Opt_barrier, "barrier"}, 1277 {Opt_nobarrier, "nobarrier"}, 1278 {Opt_i_version, "i_version"}, 1279 {Opt_stripe, "stripe=%u"}, 1280 {Opt_resize, "resize"}, 1281 {Opt_delalloc, "delalloc"}, 1282 {Opt_nodelalloc, "nodelalloc"}, 1283 {Opt_block_validity, "block_validity"}, 1284 {Opt_noblock_validity, "noblock_validity"}, 1285 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1286 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1287 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1288 {Opt_auto_da_alloc, "auto_da_alloc"}, 1289 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1290 {Opt_dioread_nolock, "dioread_nolock"}, 1291 {Opt_dioread_lock, "dioread_lock"}, 1292 {Opt_discard, "discard"}, 1293 {Opt_nodiscard, "nodiscard"}, 1294 {Opt_err, NULL}, 1295}; 1296 1297static ext4_fsblk_t get_sb_block(void **data) 1298{ 1299 ext4_fsblk_t sb_block; 1300 char *options = (char *) *data; 1301 1302 if (!options || strncmp(options, "sb=", 3) != 0) 1303 return 1; /* Default location */ 1304 1305 options += 3; 1306 /* TODO: use simple_strtoll with >32bit ext4 */ 1307 sb_block = simple_strtoul(options, &options, 0); 1308 if (*options && *options != ',') { 1309 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1310 (char *) *data); 1311 return 1; 1312 } 1313 if (*options == ',') 1314 options++; 1315 *data = (void *) options; 1316 1317 return sb_block; 1318} 1319 1320#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1321static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1322 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1323 1324#ifdef CONFIG_QUOTA 1325static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1326{ 1327 struct ext4_sb_info *sbi = EXT4_SB(sb); 1328 char *qname; 1329 1330 if (sb_any_quota_loaded(sb) && 1331 !sbi->s_qf_names[qtype]) { 1332 ext4_msg(sb, KERN_ERR, 1333 "Cannot change journaled " 1334 "quota options when quota turned on"); 1335 return 0; 1336 } 1337 qname = match_strdup(args); 1338 if (!qname) { 1339 ext4_msg(sb, KERN_ERR, 1340 "Not enough memory for storing quotafile name"); 1341 return 0; 1342 } 1343 if (sbi->s_qf_names[qtype] && 1344 strcmp(sbi->s_qf_names[qtype], qname)) { 1345 ext4_msg(sb, KERN_ERR, 1346 "%s quota file already specified", QTYPE2NAME(qtype)); 1347 kfree(qname); 1348 return 0; 1349 } 1350 sbi->s_qf_names[qtype] = qname; 1351 if (strchr(sbi->s_qf_names[qtype], '/')) { 1352 ext4_msg(sb, KERN_ERR, 1353 "quotafile must be on filesystem root"); 1354 kfree(sbi->s_qf_names[qtype]); 1355 sbi->s_qf_names[qtype] = NULL; 1356 return 0; 1357 } 1358 set_opt(sbi->s_mount_opt, QUOTA); 1359 return 1; 1360} 1361 1362static int clear_qf_name(struct super_block *sb, int qtype) 1363{ 1364 1365 struct ext4_sb_info *sbi = EXT4_SB(sb); 1366 1367 if (sb_any_quota_loaded(sb) && 1368 sbi->s_qf_names[qtype]) { 1369 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1370 " when quota turned on"); 1371 return 0; 1372 } 1373 /* 1374 * The space will be released later when all options are confirmed 1375 * to be correct 1376 */ 1377 sbi->s_qf_names[qtype] = NULL; 1378 return 1; 1379} 1380#endif 1381 1382static int parse_options(char *options, struct super_block *sb, 1383 unsigned long *journal_devnum, 1384 unsigned int *journal_ioprio, 1385 ext4_fsblk_t *n_blocks_count, int is_remount) 1386{ 1387 struct ext4_sb_info *sbi = EXT4_SB(sb); 1388 char *p; 1389 substring_t args[MAX_OPT_ARGS]; 1390 int data_opt = 0; 1391 int option; 1392#ifdef CONFIG_QUOTA 1393 int qfmt; 1394#endif 1395 1396 if (!options) 1397 return 1; 1398 1399 while ((p = strsep(&options, ",")) != NULL) { 1400 int token; 1401 if (!*p) 1402 continue; 1403 1404 /* 1405 * Initialize args struct so we know whether arg was 1406 * found; some options take optional arguments. 1407 */ 1408 args[0].to = args[0].from = 0; 1409 token = match_token(p, tokens, args); 1410 switch (token) { 1411 case Opt_bsd_df: 1412 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1413 clear_opt(sbi->s_mount_opt, MINIX_DF); 1414 break; 1415 case Opt_minix_df: 1416 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1417 set_opt(sbi->s_mount_opt, MINIX_DF); 1418 1419 break; 1420 case Opt_grpid: 1421 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1422 set_opt(sbi->s_mount_opt, GRPID); 1423 1424 break; 1425 case Opt_nogrpid: 1426 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1427 clear_opt(sbi->s_mount_opt, GRPID); 1428 1429 break; 1430 case Opt_resuid: 1431 if (match_int(&args[0], &option)) 1432 return 0; 1433 sbi->s_resuid = option; 1434 break; 1435 case Opt_resgid: 1436 if (match_int(&args[0], &option)) 1437 return 0; 1438 sbi->s_resgid = option; 1439 break; 1440 case Opt_sb: 1441 /* handled by get_sb_block() instead of here */ 1442 /* *sb_block = match_int(&args[0]); */ 1443 break; 1444 case Opt_err_panic: 1445 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1446 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1447 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1448 break; 1449 case Opt_err_ro: 1450 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1451 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1452 set_opt(sbi->s_mount_opt, ERRORS_RO); 1453 break; 1454 case Opt_err_cont: 1455 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1456 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1457 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1458 break; 1459 case Opt_nouid32: 1460 set_opt(sbi->s_mount_opt, NO_UID32); 1461 break; 1462 case Opt_debug: 1463 set_opt(sbi->s_mount_opt, DEBUG); 1464 break; 1465 case Opt_oldalloc: 1466 set_opt(sbi->s_mount_opt, OLDALLOC); 1467 break; 1468 case Opt_orlov: 1469 clear_opt(sbi->s_mount_opt, OLDALLOC); 1470 break; 1471#ifdef CONFIG_EXT4_FS_XATTR 1472 case Opt_user_xattr: 1473 set_opt(sbi->s_mount_opt, XATTR_USER); 1474 break; 1475 case Opt_nouser_xattr: 1476 clear_opt(sbi->s_mount_opt, XATTR_USER); 1477 break; 1478#else 1479 case Opt_user_xattr: 1480 case Opt_nouser_xattr: 1481 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); 1482 break; 1483#endif 1484#ifdef CONFIG_EXT4_FS_POSIX_ACL 1485 case Opt_acl: 1486 set_opt(sbi->s_mount_opt, POSIX_ACL); 1487 break; 1488 case Opt_noacl: 1489 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1490 break; 1491#else 1492 case Opt_acl: 1493 case Opt_noacl: 1494 ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); 1495 break; 1496#endif 1497 case Opt_journal_update: 1498 /* Eventually we will want to be able to create 1499 a journal file here. For now, only allow the 1500 user to specify an existing inode to be the 1501 journal file. */ 1502 if (is_remount) { 1503 ext4_msg(sb, KERN_ERR, 1504 "Cannot specify journal on remount"); 1505 return 0; 1506 } 1507 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1508 break; 1509 case Opt_journal_dev: 1510 if (is_remount) { 1511 ext4_msg(sb, KERN_ERR, 1512 "Cannot specify journal on remount"); 1513 return 0; 1514 } 1515 if (match_int(&args[0], &option)) 1516 return 0; 1517 *journal_devnum = option; 1518 break; 1519 case Opt_journal_checksum: 1520 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1521 break; 1522 case Opt_journal_async_commit: 1523 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1524 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1525 break; 1526 case Opt_noload: 1527 set_opt(sbi->s_mount_opt, NOLOAD); 1528 break; 1529 case Opt_commit: 1530 if (match_int(&args[0], &option)) 1531 return 0; 1532 if (option < 0) 1533 return 0; 1534 if (option == 0) 1535 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1536 sbi->s_commit_interval = HZ * option; 1537 break; 1538 case Opt_max_batch_time: 1539 if (match_int(&args[0], &option)) 1540 return 0; 1541 if (option < 0) 1542 return 0; 1543 if (option == 0) 1544 option = EXT4_DEF_MAX_BATCH_TIME; 1545 sbi->s_max_batch_time = option; 1546 break; 1547 case Opt_min_batch_time: 1548 if (match_int(&args[0], &option)) 1549 return 0; 1550 if (option < 0) 1551 return 0; 1552 sbi->s_min_batch_time = option; 1553 break; 1554 case Opt_data_journal: 1555 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1556 goto datacheck; 1557 case Opt_data_ordered: 1558 data_opt = EXT4_MOUNT_ORDERED_DATA; 1559 goto datacheck; 1560 case Opt_data_writeback: 1561 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1562 datacheck: 1563 if (is_remount) { 1564 if (test_opt(sb, DATA_FLAGS) != data_opt) { 1565 ext4_msg(sb, KERN_ERR, 1566 "Cannot change data mode on remount"); 1567 return 0; 1568 } 1569 } else { 1570 clear_opt(sbi->s_mount_opt, DATA_FLAGS); 1571 sbi->s_mount_opt |= data_opt; 1572 } 1573 break; 1574 case Opt_data_err_abort: 1575 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1576 break; 1577 case Opt_data_err_ignore: 1578 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1579 break; 1580#ifdef CONFIG_QUOTA 1581 case Opt_usrjquota: 1582 if (!set_qf_name(sb, USRQUOTA, &args[0])) 1583 return 0; 1584 break; 1585 case Opt_grpjquota: 1586 if (!set_qf_name(sb, GRPQUOTA, &args[0])) 1587 return 0; 1588 break; 1589 case Opt_offusrjquota: 1590 if (!clear_qf_name(sb, USRQUOTA)) 1591 return 0; 1592 break; 1593 case Opt_offgrpjquota: 1594 if (!clear_qf_name(sb, GRPQUOTA)) 1595 return 0; 1596 break; 1597 1598 case Opt_jqfmt_vfsold: 1599 qfmt = QFMT_VFS_OLD; 1600 goto set_qf_format; 1601 case Opt_jqfmt_vfsv0: 1602 qfmt = QFMT_VFS_V0; 1603 goto set_qf_format; 1604 case Opt_jqfmt_vfsv1: 1605 qfmt = QFMT_VFS_V1; 1606set_qf_format: 1607 if (sb_any_quota_loaded(sb) && 1608 sbi->s_jquota_fmt != qfmt) { 1609 ext4_msg(sb, KERN_ERR, "Cannot change " 1610 "journaled quota options when " 1611 "quota turned on"); 1612 return 0; 1613 } 1614 sbi->s_jquota_fmt = qfmt; 1615 break; 1616 case Opt_quota: 1617 case Opt_usrquota: 1618 set_opt(sbi->s_mount_opt, QUOTA); 1619 set_opt(sbi->s_mount_opt, USRQUOTA); 1620 break; 1621 case Opt_grpquota: 1622 set_opt(sbi->s_mount_opt, QUOTA); 1623 set_opt(sbi->s_mount_opt, GRPQUOTA); 1624 break; 1625 case Opt_noquota: 1626 if (sb_any_quota_loaded(sb)) { 1627 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1628 "options when quota turned on"); 1629 return 0; 1630 } 1631 clear_opt(sbi->s_mount_opt, QUOTA); 1632 clear_opt(sbi->s_mount_opt, USRQUOTA); 1633 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1634 break; 1635#else 1636 case Opt_quota: 1637 case Opt_usrquota: 1638 case Opt_grpquota: 1639 ext4_msg(sb, KERN_ERR, 1640 "quota options not supported"); 1641 break; 1642 case Opt_usrjquota: 1643 case Opt_grpjquota: 1644 case Opt_offusrjquota: 1645 case Opt_offgrpjquota: 1646 case Opt_jqfmt_vfsold: 1647 case Opt_jqfmt_vfsv0: 1648 case Opt_jqfmt_vfsv1: 1649 ext4_msg(sb, KERN_ERR, 1650 "journaled quota options not supported"); 1651 break; 1652 case Opt_noquota: 1653 break; 1654#endif 1655 case Opt_abort: 1656 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1657 break; 1658 case Opt_nobarrier: 1659 clear_opt(sbi->s_mount_opt, BARRIER); 1660 break; 1661 case Opt_barrier: 1662 if (args[0].from) { 1663 if (match_int(&args[0], &option)) 1664 return 0; 1665 } else 1666 option = 1; /* No argument, default to 1 */ 1667 if (option) 1668 set_opt(sbi->s_mount_opt, BARRIER); 1669 else 1670 clear_opt(sbi->s_mount_opt, BARRIER); 1671 break; 1672 case Opt_ignore: 1673 break; 1674 case Opt_resize: 1675 if (!is_remount) { 1676 ext4_msg(sb, KERN_ERR, 1677 "resize option only available " 1678 "for remount"); 1679 return 0; 1680 } 1681 if (match_int(&args[0], &option) != 0) 1682 return 0; 1683 *n_blocks_count = option; 1684 break; 1685 case Opt_nobh: 1686 ext4_msg(sb, KERN_WARNING, 1687 "Ignoring deprecated nobh option"); 1688 break; 1689 case Opt_bh: 1690 ext4_msg(sb, KERN_WARNING, 1691 "Ignoring deprecated bh option"); 1692 break; 1693 case Opt_i_version: 1694 set_opt(sbi->s_mount_opt, I_VERSION); 1695 sb->s_flags |= MS_I_VERSION; 1696 break; 1697 case Opt_nodelalloc: 1698 clear_opt(sbi->s_mount_opt, DELALLOC); 1699 break; 1700 case Opt_stripe: 1701 if (match_int(&args[0], &option)) 1702 return 0; 1703 if (option < 0) 1704 return 0; 1705 sbi->s_stripe = option; 1706 break; 1707 case Opt_delalloc: 1708 set_opt(sbi->s_mount_opt, DELALLOC); 1709 break; 1710 case Opt_block_validity: 1711 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 1712 break; 1713 case Opt_noblock_validity: 1714 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 1715 break; 1716 case Opt_inode_readahead_blks: 1717 if (match_int(&args[0], &option)) 1718 return 0; 1719 if (option < 0 || option > (1 << 30)) 1720 return 0; 1721 if (!is_power_of_2(option)) { 1722 ext4_msg(sb, KERN_ERR, 1723 "EXT4-fs: inode_readahead_blks" 1724 " must be a power of 2"); 1725 return 0; 1726 } 1727 sbi->s_inode_readahead_blks = option; 1728 break; 1729 case Opt_journal_ioprio: 1730 if (match_int(&args[0], &option)) 1731 return 0; 1732 if (option < 0 || option > 7) 1733 break; 1734 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 1735 option); 1736 break; 1737 case Opt_noauto_da_alloc: 1738 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); 1739 break; 1740 case Opt_auto_da_alloc: 1741 if (args[0].from) { 1742 if (match_int(&args[0], &option)) 1743 return 0; 1744 } else 1745 option = 1; /* No argument, default to 1 */ 1746 if (option) 1747 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC); 1748 else 1749 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); 1750 break; 1751 case Opt_discard: 1752 set_opt(sbi->s_mount_opt, DISCARD); 1753 break; 1754 case Opt_nodiscard: 1755 clear_opt(sbi->s_mount_opt, DISCARD); 1756 break; 1757 case Opt_dioread_nolock: 1758 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 1759 break; 1760 case Opt_dioread_lock: 1761 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 1762 break; 1763 default: 1764 ext4_msg(sb, KERN_ERR, 1765 "Unrecognized mount option \"%s\" " 1766 "or missing value", p); 1767 return 0; 1768 } 1769 } 1770#ifdef CONFIG_QUOTA 1771 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1772 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1773 clear_opt(sbi->s_mount_opt, USRQUOTA); 1774 1775 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1776 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1777 1778 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1779 ext4_msg(sb, KERN_ERR, "old and new quota " 1780 "format mixing"); 1781 return 0; 1782 } 1783 1784 if (!sbi->s_jquota_fmt) { 1785 ext4_msg(sb, KERN_ERR, "journaled quota format " 1786 "not specified"); 1787 return 0; 1788 } 1789 } else { 1790 if (sbi->s_jquota_fmt) { 1791 ext4_msg(sb, KERN_ERR, "journaled quota format " 1792 "specified with no journaling " 1793 "enabled"); 1794 return 0; 1795 } 1796 } 1797#endif 1798 return 1; 1799} 1800 1801static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1802 int read_only) 1803{ 1804 struct ext4_sb_info *sbi = EXT4_SB(sb); 1805 int res = 0; 1806 1807 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1808 ext4_msg(sb, KERN_ERR, "revision level too high, " 1809 "forcing read-only mode"); 1810 res = MS_RDONLY; 1811 } 1812 if (read_only) 1813 return res; 1814 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1815 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1816 "running e2fsck is recommended"); 1817 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1818 ext4_msg(sb, KERN_WARNING, 1819 "warning: mounting fs with errors, " 1820 "running e2fsck is recommended"); 1821 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1822 le16_to_cpu(es->s_mnt_count) >= 1823 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1824 ext4_msg(sb, KERN_WARNING, 1825 "warning: maximal mount count reached, " 1826 "running e2fsck is recommended"); 1827 else if (le32_to_cpu(es->s_checkinterval) && 1828 (le32_to_cpu(es->s_lastcheck) + 1829 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1830 ext4_msg(sb, KERN_WARNING, 1831 "warning: checktime reached, " 1832 "running e2fsck is recommended"); 1833 if (!sbi->s_journal) 1834 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1835 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1836 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1837 le16_add_cpu(&es->s_mnt_count, 1); 1838 es->s_mtime = cpu_to_le32(get_seconds()); 1839 ext4_update_dynamic_rev(sb); 1840 if (sbi->s_journal) 1841 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1842 1843 ext4_commit_super(sb, 1); 1844 if (test_opt(sb, DEBUG)) 1845 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1846 "bpg=%lu, ipg=%lu, mo=%04x]\n", 1847 sb->s_blocksize, 1848 sbi->s_groups_count, 1849 EXT4_BLOCKS_PER_GROUP(sb), 1850 EXT4_INODES_PER_GROUP(sb), 1851 sbi->s_mount_opt); 1852 1853 return res; 1854} 1855 1856static int ext4_fill_flex_info(struct super_block *sb) 1857{ 1858 struct ext4_sb_info *sbi = EXT4_SB(sb); 1859 struct ext4_group_desc *gdp = NULL; 1860 ext4_group_t flex_group_count; 1861 ext4_group_t flex_group; 1862 int groups_per_flex = 0; 1863 size_t size; 1864 int i; 1865 1866 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1867 groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1868 1869 if (groups_per_flex < 2) { 1870 sbi->s_log_groups_per_flex = 0; 1871 return 1; 1872 } 1873 1874 /* We allocate both existing and potentially added groups */ 1875 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1876 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 1877 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 1878 size = flex_group_count * sizeof(struct flex_groups); 1879 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL); 1880 if (sbi->s_flex_groups == NULL) { 1881 sbi->s_flex_groups = vmalloc(size); 1882 if (sbi->s_flex_groups) 1883 memset(sbi->s_flex_groups, 0, size); 1884 } 1885 if (sbi->s_flex_groups == NULL) { 1886 ext4_msg(sb, KERN_ERR, "not enough memory for " 1887 "%u flex groups", flex_group_count); 1888 goto failed; 1889 } 1890 1891 for (i = 0; i < sbi->s_groups_count; i++) { 1892 gdp = ext4_get_group_desc(sb, i, NULL); 1893 1894 flex_group = ext4_flex_group(sbi, i); 1895 atomic_add(ext4_free_inodes_count(sb, gdp), 1896 &sbi->s_flex_groups[flex_group].free_inodes); 1897 atomic_add(ext4_free_blks_count(sb, gdp), 1898 &sbi->s_flex_groups[flex_group].free_blocks); 1899 atomic_add(ext4_used_dirs_count(sb, gdp), 1900 &sbi->s_flex_groups[flex_group].used_dirs); 1901 } 1902 1903 return 1; 1904failed: 1905 return 0; 1906} 1907 1908__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1909 struct ext4_group_desc *gdp) 1910{ 1911 __u16 crc = 0; 1912 1913 if (sbi->s_es->s_feature_ro_compat & 1914 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1915 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1916 __le32 le_group = cpu_to_le32(block_group); 1917 1918 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1919 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1920 crc = crc16(crc, (__u8 *)gdp, offset); 1921 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1922 /* for checksum of struct ext4_group_desc do the rest...*/ 1923 if ((sbi->s_es->s_feature_incompat & 1924 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1925 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1926 crc = crc16(crc, (__u8 *)gdp + offset, 1927 le16_to_cpu(sbi->s_es->s_desc_size) - 1928 offset); 1929 } 1930 1931 return cpu_to_le16(crc); 1932} 1933 1934int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1935 struct ext4_group_desc *gdp) 1936{ 1937 if ((sbi->s_es->s_feature_ro_compat & 1938 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1939 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1940 return 0; 1941 1942 return 1; 1943} 1944 1945/* Called at mount-time, super-block is locked */ 1946static int ext4_check_descriptors(struct super_block *sb) 1947{ 1948 struct ext4_sb_info *sbi = EXT4_SB(sb); 1949 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1950 ext4_fsblk_t last_block; 1951 ext4_fsblk_t block_bitmap; 1952 ext4_fsblk_t inode_bitmap; 1953 ext4_fsblk_t inode_table; 1954 int flexbg_flag = 0; 1955 ext4_group_t i; 1956 1957 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1958 flexbg_flag = 1; 1959 1960 ext4_debug("Checking group descriptors"); 1961 1962 for (i = 0; i < sbi->s_groups_count; i++) { 1963 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1964 1965 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1966 last_block = ext4_blocks_count(sbi->s_es) - 1; 1967 else 1968 last_block = first_block + 1969 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1970 1971 block_bitmap = ext4_block_bitmap(sb, gdp); 1972 if (block_bitmap < first_block || block_bitmap > last_block) { 1973 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1974 "Block bitmap for group %u not in group " 1975 "(block %llu)!", i, block_bitmap); 1976 return 0; 1977 } 1978 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1979 if (inode_bitmap < first_block || inode_bitmap > last_block) { 1980 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1981 "Inode bitmap for group %u not in group " 1982 "(block %llu)!", i, inode_bitmap); 1983 return 0; 1984 } 1985 inode_table = ext4_inode_table(sb, gdp); 1986 if (inode_table < first_block || 1987 inode_table + sbi->s_itb_per_group - 1 > last_block) { 1988 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1989 "Inode table for group %u not in group " 1990 "(block %llu)!", i, inode_table); 1991 return 0; 1992 } 1993 ext4_lock_group(sb, i); 1994 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1995 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1996 "Checksum for group %u failed (%u!=%u)", 1997 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1998 gdp)), le16_to_cpu(gdp->bg_checksum)); 1999 if (!(sb->s_flags & MS_RDONLY)) { 2000 ext4_unlock_group(sb, i); 2001 return 0; 2002 } 2003 } 2004 ext4_unlock_group(sb, i); 2005 if (!flexbg_flag) 2006 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2007 } 2008 2009 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 2010 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 2011 return 1; 2012} 2013 2014/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2015 * the superblock) which were deleted from all directories, but held open by 2016 * a process at the time of a crash. We walk the list and try to delete these 2017 * inodes at recovery time (only with a read-write filesystem). 2018 * 2019 * In order to keep the orphan inode chain consistent during traversal (in 2020 * case of crash during recovery), we link each inode into the superblock 2021 * orphan list_head and handle it the same way as an inode deletion during 2022 * normal operation (which journals the operations for us). 2023 * 2024 * We only do an iget() and an iput() on each inode, which is very safe if we 2025 * accidentally point at an in-use or already deleted inode. The worst that 2026 * can happen in this case is that we get a "bit already cleared" message from 2027 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2028 * e2fsck was run on this filesystem, and it must have already done the orphan 2029 * inode cleanup for us, so we can safely abort without any further action. 2030 */ 2031static void ext4_orphan_cleanup(struct super_block *sb, 2032 struct ext4_super_block *es) 2033{ 2034 unsigned int s_flags = sb->s_flags; 2035 int nr_orphans = 0, nr_truncates = 0; 2036#ifdef CONFIG_QUOTA 2037 int i; 2038#endif 2039 if (!es->s_last_orphan) { 2040 jbd_debug(4, "no orphan inodes to clean up\n"); 2041 return; 2042 } 2043 2044 if (bdev_read_only(sb->s_bdev)) { 2045 ext4_msg(sb, KERN_ERR, "write access " 2046 "unavailable, skipping orphan cleanup"); 2047 return; 2048 } 2049 2050 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2051 if (es->s_last_orphan) 2052 jbd_debug(1, "Errors on filesystem, " 2053 "clearing orphan list.\n"); 2054 es->s_last_orphan = 0; 2055 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2056 return; 2057 } 2058 2059 if (s_flags & MS_RDONLY) { 2060 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2061 sb->s_flags &= ~MS_RDONLY; 2062 } 2063#ifdef CONFIG_QUOTA 2064 /* Needed for iput() to work correctly and not trash data */ 2065 sb->s_flags |= MS_ACTIVE; 2066 /* Turn on quotas so that they are updated correctly */ 2067 for (i = 0; i < MAXQUOTAS; i++) { 2068 if (EXT4_SB(sb)->s_qf_names[i]) { 2069 int ret = ext4_quota_on_mount(sb, i); 2070 if (ret < 0) 2071 ext4_msg(sb, KERN_ERR, 2072 "Cannot turn on journaled " 2073 "quota: error %d", ret); 2074 } 2075 } 2076#endif 2077 2078 while (es->s_last_orphan) { 2079 struct inode *inode; 2080 2081 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2082 if (IS_ERR(inode)) { 2083 es->s_last_orphan = 0; 2084 break; 2085 } 2086 2087 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2088 dquot_initialize(inode); 2089 if (inode->i_nlink) { 2090 ext4_msg(sb, KERN_DEBUG, 2091 "%s: truncating inode %lu to %lld bytes", 2092 __func__, inode->i_ino, inode->i_size); 2093 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2094 inode->i_ino, inode->i_size); 2095 ext4_truncate(inode); 2096 nr_truncates++; 2097 } else { 2098 ext4_msg(sb, KERN_DEBUG, 2099 "%s: deleting unreferenced inode %lu", 2100 __func__, inode->i_ino); 2101 jbd_debug(2, "deleting unreferenced inode %lu\n", 2102 inode->i_ino); 2103 nr_orphans++; 2104 } 2105 iput(inode); /* The delete magic happens here! */ 2106 } 2107 2108#define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2109 2110 if (nr_orphans) 2111 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2112 PLURAL(nr_orphans)); 2113 if (nr_truncates) 2114 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2115 PLURAL(nr_truncates)); 2116#ifdef CONFIG_QUOTA 2117 /* Turn quotas off */ 2118 for (i = 0; i < MAXQUOTAS; i++) { 2119 if (sb_dqopt(sb)->files[i]) 2120 dquot_quota_off(sb, i); 2121 } 2122#endif 2123 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2124} 2125 2126/* 2127 * Maximal extent format file size. 2128 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2129 * extent format containers, within a sector_t, and within i_blocks 2130 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2131 * so that won't be a limiting factor. 2132 * 2133 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2134 */ 2135static loff_t ext4_max_size(int blkbits, int has_huge_files) 2136{ 2137 loff_t res; 2138 loff_t upper_limit = MAX_LFS_FILESIZE; 2139 2140 /* small i_blocks in vfs inode? */ 2141 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2142 /* 2143 * CONFIG_LBDAF is not enabled implies the inode 2144 * i_block represent total blocks in 512 bytes 2145 * 32 == size of vfs inode i_blocks * 8 2146 */ 2147 upper_limit = (1LL << 32) - 1; 2148 2149 /* total blocks in file system block size */ 2150 upper_limit >>= (blkbits - 9); 2151 upper_limit <<= blkbits; 2152 } 2153 2154 /* 32-bit extent-start container, ee_block */ 2155 res = 1LL << 32; 2156 res <<= blkbits; 2157 res -= 1; 2158 2159 /* Sanity check against vm- & vfs- imposed limits */ 2160 if (res > upper_limit) 2161 res = upper_limit; 2162 2163 return res; 2164} 2165 2166/* 2167 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2168 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2169 * We need to be 1 filesystem block less than the 2^48 sector limit. 2170 */ 2171static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2172{ 2173 loff_t res = EXT4_NDIR_BLOCKS; 2174 int meta_blocks; 2175 loff_t upper_limit; 2176 /* This is calculated to be the largest file size for a dense, block 2177 * mapped file such that the file's total number of 512-byte sectors, 2178 * including data and all indirect blocks, does not exceed (2^48 - 1). 2179 * 2180 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2181 * number of 512-byte sectors of the file. 2182 */ 2183 2184 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2185 /* 2186 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2187 * the inode i_block field represents total file blocks in 2188 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2189 */ 2190 upper_limit = (1LL << 32) - 1; 2191 2192 /* total blocks in file system block size */ 2193 upper_limit >>= (bits - 9); 2194 2195 } else { 2196 /* 2197 * We use 48 bit ext4_inode i_blocks 2198 * With EXT4_HUGE_FILE_FL set the i_blocks 2199 * represent total number of blocks in 2200 * file system block size 2201 */ 2202 upper_limit = (1LL << 48) - 1; 2203 2204 } 2205 2206 /* indirect blocks */ 2207 meta_blocks = 1; 2208 /* double indirect blocks */ 2209 meta_blocks += 1 + (1LL << (bits-2)); 2210 /* tripple indirect blocks */ 2211 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2212 2213 upper_limit -= meta_blocks; 2214 upper_limit <<= bits; 2215 2216 res += 1LL << (bits-2); 2217 res += 1LL << (2*(bits-2)); 2218 res += 1LL << (3*(bits-2)); 2219 res <<= bits; 2220 if (res > upper_limit) 2221 res = upper_limit; 2222 2223 if (res > MAX_LFS_FILESIZE) 2224 res = MAX_LFS_FILESIZE; 2225 2226 return res; 2227} 2228 2229static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2230 ext4_fsblk_t logical_sb_block, int nr) 2231{ 2232 struct ext4_sb_info *sbi = EXT4_SB(sb); 2233 ext4_group_t bg, first_meta_bg; 2234 int has_super = 0; 2235 2236 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2237 2238 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2239 nr < first_meta_bg) 2240 return logical_sb_block + nr + 1; 2241 bg = sbi->s_desc_per_block * nr; 2242 if (ext4_bg_has_super(sb, bg)) 2243 has_super = 1; 2244 2245 return (has_super + ext4_group_first_block_no(sb, bg)); 2246} 2247 2248/** 2249 * ext4_get_stripe_size: Get the stripe size. 2250 * @sbi: In memory super block info 2251 * 2252 * If we have specified it via mount option, then 2253 * use the mount option value. If the value specified at mount time is 2254 * greater than the blocks per group use the super block value. 2255 * If the super block value is greater than blocks per group return 0. 2256 * Allocator needs it be less than blocks per group. 2257 * 2258 */ 2259static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2260{ 2261 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2262 unsigned long stripe_width = 2263 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2264 2265 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2266 return sbi->s_stripe; 2267 2268 if (stripe_width <= sbi->s_blocks_per_group) 2269 return stripe_width; 2270 2271 if (stride <= sbi->s_blocks_per_group) 2272 return stride; 2273 2274 return 0; 2275} 2276 2277/* sysfs supprt */ 2278 2279struct ext4_attr { 2280 struct attribute attr; 2281 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 2282 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 2283 const char *, size_t); 2284 int offset; 2285}; 2286 2287static int parse_strtoul(const char *buf, 2288 unsigned long max, unsigned long *value) 2289{ 2290 char *endp; 2291 2292 *value = simple_strtoul(skip_spaces(buf), &endp, 0); 2293 endp = skip_spaces(endp); 2294 if (*endp || *value > max) 2295 return -EINVAL; 2296 2297 return 0; 2298} 2299 2300static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 2301 struct ext4_sb_info *sbi, 2302 char *buf) 2303{ 2304 return snprintf(buf, PAGE_SIZE, "%llu\n", 2305 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); 2306} 2307 2308static ssize_t session_write_kbytes_show(struct ext4_attr *a, 2309 struct ext4_sb_info *sbi, char *buf) 2310{ 2311 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2312 2313 if (!sb->s_bdev->bd_part) 2314 return snprintf(buf, PAGE_SIZE, "0\n"); 2315 return snprintf(buf, PAGE_SIZE, "%lu\n", 2316 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2317 sbi->s_sectors_written_start) >> 1); 2318} 2319 2320static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 2321 struct ext4_sb_info *sbi, char *buf) 2322{ 2323 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2324 2325 if (!sb->s_bdev->bd_part) 2326 return snprintf(buf, PAGE_SIZE, "0\n"); 2327 return snprintf(buf, PAGE_SIZE, "%llu\n", 2328 (unsigned long long)(sbi->s_kbytes_written + 2329 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2330 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 2331} 2332 2333static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 2334 struct ext4_sb_info *sbi, 2335 const char *buf, size_t count) 2336{ 2337 unsigned long t; 2338 2339 if (parse_strtoul(buf, 0x40000000, &t)) 2340 return -EINVAL; 2341 2342 if (!is_power_of_2(t)) 2343 return -EINVAL; 2344 2345 sbi->s_inode_readahead_blks = t; 2346 return count; 2347} 2348 2349static ssize_t sbi_ui_show(struct ext4_attr *a, 2350 struct ext4_sb_info *sbi, char *buf) 2351{ 2352 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2353 2354 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 2355} 2356 2357static ssize_t sbi_ui_store(struct ext4_attr *a, 2358 struct ext4_sb_info *sbi, 2359 const char *buf, size_t count) 2360{ 2361 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2362 unsigned long t; 2363 2364 if (parse_strtoul(buf, 0xffffffff, &t)) 2365 return -EINVAL; 2366 *ui = t; 2367 return count; 2368} 2369 2370#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 2371static struct ext4_attr ext4_attr_##_name = { \ 2372 .attr = {.name = __stringify(_name), .mode = _mode }, \ 2373 .show = _show, \ 2374 .store = _store, \ 2375 .offset = offsetof(struct ext4_sb_info, _elname), \ 2376} 2377#define EXT4_ATTR(name, mode, show, store) \ 2378static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 2379 2380#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 2381#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 2382#define EXT4_RW_ATTR_SBI_UI(name, elname) \ 2383 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 2384#define ATTR_LIST(name) &ext4_attr_##name.attr 2385 2386EXT4_RO_ATTR(delayed_allocation_blocks); 2387EXT4_RO_ATTR(session_write_kbytes); 2388EXT4_RO_ATTR(lifetime_write_kbytes); 2389EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 2390 inode_readahead_blks_store, s_inode_readahead_blks); 2391EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 2392EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 2393EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 2394EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 2395EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 2396EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 2397EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 2398EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); 2399 2400static struct attribute *ext4_attrs[] = { 2401 ATTR_LIST(delayed_allocation_blocks), 2402 ATTR_LIST(session_write_kbytes), 2403 ATTR_LIST(lifetime_write_kbytes), 2404 ATTR_LIST(inode_readahead_blks), 2405 ATTR_LIST(inode_goal), 2406 ATTR_LIST(mb_stats), 2407 ATTR_LIST(mb_max_to_scan), 2408 ATTR_LIST(mb_min_to_scan), 2409 ATTR_LIST(mb_order2_req), 2410 ATTR_LIST(mb_stream_req), 2411 ATTR_LIST(mb_group_prealloc), 2412 ATTR_LIST(max_writeback_mb_bump), 2413 NULL, 2414}; 2415 2416static ssize_t ext4_attr_show(struct kobject *kobj, 2417 struct attribute *attr, char *buf) 2418{ 2419 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2420 s_kobj); 2421 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2422 2423 return a->show ? a->show(a, sbi, buf) : 0; 2424} 2425 2426static ssize_t ext4_attr_store(struct kobject *kobj, 2427 struct attribute *attr, 2428 const char *buf, size_t len) 2429{ 2430 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2431 s_kobj); 2432 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2433 2434 return a->store ? a->store(a, sbi, buf, len) : 0; 2435} 2436 2437static void ext4_sb_release(struct kobject *kobj) 2438{ 2439 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2440 s_kobj); 2441 complete(&sbi->s_kobj_unregister); 2442} 2443 2444 2445static const struct sysfs_ops ext4_attr_ops = { 2446 .show = ext4_attr_show, 2447 .store = ext4_attr_store, 2448}; 2449 2450static struct kobj_type ext4_ktype = { 2451 .default_attrs = ext4_attrs, 2452 .sysfs_ops = &ext4_attr_ops, 2453 .release = ext4_sb_release, 2454}; 2455 2456/* 2457 * Check whether this filesystem can be mounted based on 2458 * the features present and the RDONLY/RDWR mount requested. 2459 * Returns 1 if this filesystem can be mounted as requested, 2460 * 0 if it cannot be. 2461 */ 2462static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2463{ 2464 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2465 ext4_msg(sb, KERN_ERR, 2466 "Couldn't mount because of " 2467 "unsupported optional features (%x)", 2468 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2469 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2470 return 0; 2471 } 2472 2473 if (readonly) 2474 return 1; 2475 2476 /* Check that feature set is OK for a read-write mount */ 2477 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2478 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2479 "unsupported optional features (%x)", 2480 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2481 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2482 return 0; 2483 } 2484 /* 2485 * Large file size enabled file system can only be mounted 2486 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2487 */ 2488 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2489 if (sizeof(blkcnt_t) < sizeof(u64)) { 2490 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2491 "cannot be mounted RDWR without " 2492 "CONFIG_LBDAF"); 2493 return 0; 2494 } 2495 } 2496 return 1; 2497} 2498 2499/* 2500 * This function is called once a day if we have errors logged 2501 * on the file system 2502 */ 2503static void print_daily_error_info(unsigned long arg) 2504{ 2505 struct super_block *sb = (struct super_block *) arg; 2506 struct ext4_sb_info *sbi; 2507 struct ext4_super_block *es; 2508 2509 sbi = EXT4_SB(sb); 2510 es = sbi->s_es; 2511 2512 if (es->s_error_count) 2513 ext4_msg(sb, KERN_NOTICE, "error count: %u", 2514 le32_to_cpu(es->s_error_count)); 2515 if (es->s_first_error_time) { 2516 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", 2517 sb->s_id, le32_to_cpu(es->s_first_error_time), 2518 (int) sizeof(es->s_first_error_func), 2519 es->s_first_error_func, 2520 le32_to_cpu(es->s_first_error_line)); 2521 if (es->s_first_error_ino) 2522 printk(": inode %u", 2523 le32_to_cpu(es->s_first_error_ino)); 2524 if (es->s_first_error_block) 2525 printk(": block %llu", (unsigned long long) 2526 le64_to_cpu(es->s_first_error_block)); 2527 printk("\n"); 2528 } 2529 if (es->s_last_error_time) { 2530 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", 2531 sb->s_id, le32_to_cpu(es->s_last_error_time), 2532 (int) sizeof(es->s_last_error_func), 2533 es->s_last_error_func, 2534 le32_to_cpu(es->s_last_error_line)); 2535 if (es->s_last_error_ino) 2536 printk(": inode %u", 2537 le32_to_cpu(es->s_last_error_ino)); 2538 if (es->s_last_error_block) 2539 printk(": block %llu", (unsigned long long) 2540 le64_to_cpu(es->s_last_error_block)); 2541 printk("\n"); 2542 } 2543 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2544} 2545 2546static int ext4_fill_super(struct super_block *sb, void *data, int silent) 2547 __releases(kernel_lock) 2548 __acquires(kernel_lock) 2549{ 2550 char *orig_data = kstrdup(data, GFP_KERNEL); 2551 struct buffer_head *bh; 2552 struct ext4_super_block *es = NULL; 2553 struct ext4_sb_info *sbi; 2554 ext4_fsblk_t block; 2555 ext4_fsblk_t sb_block = get_sb_block(&data); 2556 ext4_fsblk_t logical_sb_block; 2557 unsigned long offset = 0; 2558 unsigned long journal_devnum = 0; 2559 unsigned long def_mount_opts; 2560 struct inode *root; 2561 char *cp; 2562 const char *descr; 2563 int ret = -ENOMEM; 2564 int blocksize; 2565 unsigned int db_count; 2566 unsigned int i; 2567 int needs_recovery, has_huge_files; 2568 __u64 blocks_count; 2569 int err; 2570 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 2571 2572 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 2573 if (!sbi) 2574 goto out_free_orig; 2575 2576 sbi->s_blockgroup_lock = 2577 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 2578 if (!sbi->s_blockgroup_lock) { 2579 kfree(sbi); 2580 goto out_free_orig; 2581 } 2582 sb->s_fs_info = sbi; 2583 sbi->s_mount_opt = 0; 2584 sbi->s_resuid = EXT4_DEF_RESUID; 2585 sbi->s_resgid = EXT4_DEF_RESGID; 2586 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 2587 sbi->s_sb_block = sb_block; 2588 if (sb->s_bdev->bd_part) 2589 sbi->s_sectors_written_start = 2590 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 2591 2592 unlock_kernel(); 2593 2594 /* Cleanup superblock name */ 2595 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 2596 *cp = '!'; 2597 2598 ret = -EINVAL; 2599 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 2600 if (!blocksize) { 2601 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 2602 goto out_fail; 2603 } 2604 2605 /* 2606 * The ext4 superblock will not be buffer aligned for other than 1kB 2607 * block sizes. We need to calculate the offset from buffer start. 2608 */ 2609 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 2610 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2611 offset = do_div(logical_sb_block, blocksize); 2612 } else { 2613 logical_sb_block = sb_block; 2614 } 2615 2616 if (!(bh = sb_bread(sb, logical_sb_block))) { 2617 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 2618 goto out_fail; 2619 } 2620 /* 2621 * Note: s_es must be initialized as soon as possible because 2622 * some ext4 macro-instructions depend on its value 2623 */ 2624 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2625 sbi->s_es = es; 2626 sb->s_magic = le16_to_cpu(es->s_magic); 2627 if (sb->s_magic != EXT4_SUPER_MAGIC) 2628 goto cantfind_ext4; 2629 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 2630 2631 /* Set defaults before we parse the mount options */ 2632 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 2633 if (def_mount_opts & EXT4_DEFM_DEBUG) 2634 set_opt(sbi->s_mount_opt, DEBUG); 2635 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) { 2636 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups", 2637 "2.6.38"); 2638 set_opt(sbi->s_mount_opt, GRPID); 2639 } 2640 if (def_mount_opts & EXT4_DEFM_UID16) 2641 set_opt(sbi->s_mount_opt, NO_UID32); 2642#ifdef CONFIG_EXT4_FS_XATTR 2643 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 2644 set_opt(sbi->s_mount_opt, XATTR_USER); 2645#endif 2646#ifdef CONFIG_EXT4_FS_POSIX_ACL 2647 if (def_mount_opts & EXT4_DEFM_ACL) 2648 set_opt(sbi->s_mount_opt, POSIX_ACL); 2649#endif 2650 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 2651 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2652 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 2653 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2654 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 2655 set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 2656 2657 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 2658 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 2659 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 2660 set_opt(sbi->s_mount_opt, ERRORS_CONT); 2661 else 2662 set_opt(sbi->s_mount_opt, ERRORS_RO); 2663 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) 2664 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 2665 if (def_mount_opts & EXT4_DEFM_DISCARD) 2666 set_opt(sbi->s_mount_opt, DISCARD); 2667 2668 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 2669 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 2670 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 2671 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 2672 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 2673 2674 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 2675 set_opt(sbi->s_mount_opt, BARRIER); 2676 2677 /* 2678 * enable delayed allocation by default 2679 * Use -o nodelalloc to turn it off 2680 */ 2681 if (!IS_EXT3_SB(sb) && 2682 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 2683 set_opt(sbi->s_mount_opt, DELALLOC); 2684 2685 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 2686 &journal_devnum, &journal_ioprio, NULL, 0)) { 2687 ext4_msg(sb, KERN_WARNING, 2688 "failed to parse options in superblock: %s", 2689 sbi->s_es->s_mount_opts); 2690 } 2691 if (!parse_options((char *) data, sb, &journal_devnum, 2692 &journal_ioprio, NULL, 0)) 2693 goto failed_mount; 2694 2695 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2696 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 2697 2698 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2699 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2700 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2701 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2702 ext4_msg(sb, KERN_WARNING, 2703 "feature flags set on rev 0 fs, " 2704 "running e2fsck is recommended"); 2705 2706 /* 2707 * Check feature flags regardless of the revision level, since we 2708 * previously didn't change the revision level when setting the flags, 2709 * so there is a chance incompat flags are set on a rev 0 filesystem. 2710 */ 2711 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 2712 goto failed_mount; 2713 2714 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2715 2716 if (blocksize < EXT4_MIN_BLOCK_SIZE || 2717 blocksize > EXT4_MAX_BLOCK_SIZE) { 2718 ext4_msg(sb, KERN_ERR, 2719 "Unsupported filesystem blocksize %d", blocksize); 2720 goto failed_mount; 2721 } 2722 2723 if (sb->s_blocksize != blocksize) { 2724 /* Validate the filesystem blocksize */ 2725 if (!sb_set_blocksize(sb, blocksize)) { 2726 ext4_msg(sb, KERN_ERR, "bad block size %d", 2727 blocksize); 2728 goto failed_mount; 2729 } 2730 2731 brelse(bh); 2732 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2733 offset = do_div(logical_sb_block, blocksize); 2734 bh = sb_bread(sb, logical_sb_block); 2735 if (!bh) { 2736 ext4_msg(sb, KERN_ERR, 2737 "Can't read superblock on 2nd try"); 2738 goto failed_mount; 2739 } 2740 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2741 sbi->s_es = es; 2742 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2743 ext4_msg(sb, KERN_ERR, 2744 "Magic mismatch, very weird!"); 2745 goto failed_mount; 2746 } 2747 } 2748 2749 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2750 EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 2751 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 2752 has_huge_files); 2753 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 2754 2755 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2756 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2757 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2758 } else { 2759 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2760 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2761 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2762 (!is_power_of_2(sbi->s_inode_size)) || 2763 (sbi->s_inode_size > blocksize)) { 2764 ext4_msg(sb, KERN_ERR, 2765 "unsupported inode size: %d", 2766 sbi->s_inode_size); 2767 goto failed_mount; 2768 } 2769 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2770 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2771 } 2772 2773 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2774 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2775 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2776 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2777 !is_power_of_2(sbi->s_desc_size)) { 2778 ext4_msg(sb, KERN_ERR, 2779 "unsupported descriptor size %lu", 2780 sbi->s_desc_size); 2781 goto failed_mount; 2782 } 2783 } else 2784 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2785 2786 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2787 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2788 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2789 goto cantfind_ext4; 2790 2791 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2792 if (sbi->s_inodes_per_block == 0) 2793 goto cantfind_ext4; 2794 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2795 sbi->s_inodes_per_block; 2796 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2797 sbi->s_sbh = bh; 2798 sbi->s_mount_state = le16_to_cpu(es->s_state); 2799 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2800 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2801 2802 for (i = 0; i < 4; i++) 2803 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2804 sbi->s_def_hash_version = es->s_def_hash_version; 2805 i = le32_to_cpu(es->s_flags); 2806 if (i & EXT2_FLAGS_UNSIGNED_HASH) 2807 sbi->s_hash_unsigned = 3; 2808 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 2809#ifdef __CHAR_UNSIGNED__ 2810 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 2811 sbi->s_hash_unsigned = 3; 2812#else 2813 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 2814#endif 2815 sb->s_dirt = 1; 2816 } 2817 2818 if (sbi->s_blocks_per_group > blocksize * 8) { 2819 ext4_msg(sb, KERN_ERR, 2820 "#blocks per group too big: %lu", 2821 sbi->s_blocks_per_group); 2822 goto failed_mount; 2823 } 2824 if (sbi->s_inodes_per_group > blocksize * 8) { 2825 ext4_msg(sb, KERN_ERR, 2826 "#inodes per group too big: %lu", 2827 sbi->s_inodes_per_group); 2828 goto failed_mount; 2829 } 2830 2831 /* 2832 * Test whether we have more sectors than will fit in sector_t, 2833 * and whether the max offset is addressable by the page cache. 2834 */ 2835 if ((ext4_blocks_count(es) > 2836 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) || 2837 (ext4_blocks_count(es) > 2838 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) { 2839 ext4_msg(sb, KERN_ERR, "filesystem" 2840 " too large to mount safely on this system"); 2841 if (sizeof(sector_t) < 8) 2842 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 2843 ret = -EFBIG; 2844 goto failed_mount; 2845 } 2846 2847 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2848 goto cantfind_ext4; 2849 2850 /* check blocks count against device size */ 2851 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 2852 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 2853 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 2854 "exceeds size of device (%llu blocks)", 2855 ext4_blocks_count(es), blocks_count); 2856 goto failed_mount; 2857 } 2858 2859 /* 2860 * It makes no sense for the first data block to be beyond the end 2861 * of the filesystem. 2862 */ 2863 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 2864 ext4_msg(sb, KERN_WARNING, "bad geometry: first data" 2865 "block %u is beyond end of filesystem (%llu)", 2866 le32_to_cpu(es->s_first_data_block), 2867 ext4_blocks_count(es)); 2868 goto failed_mount; 2869 } 2870 blocks_count = (ext4_blocks_count(es) - 2871 le32_to_cpu(es->s_first_data_block) + 2872 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2873 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2874 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 2875 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 2876 "(block count %llu, first data block %u, " 2877 "blocks per group %lu)", sbi->s_groups_count, 2878 ext4_blocks_count(es), 2879 le32_to_cpu(es->s_first_data_block), 2880 EXT4_BLOCKS_PER_GROUP(sb)); 2881 goto failed_mount; 2882 } 2883 sbi->s_groups_count = blocks_count; 2884 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 2885 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 2886 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2887 EXT4_DESC_PER_BLOCK(sb); 2888 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2889 GFP_KERNEL); 2890 if (sbi->s_group_desc == NULL) { 2891 ext4_msg(sb, KERN_ERR, "not enough memory"); 2892 goto failed_mount; 2893 } 2894 2895#ifdef CONFIG_PROC_FS 2896 if (ext4_proc_root) 2897 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 2898#endif 2899 2900 bgl_lock_init(sbi->s_blockgroup_lock); 2901 2902 for (i = 0; i < db_count; i++) { 2903 block = descriptor_loc(sb, logical_sb_block, i); 2904 sbi->s_group_desc[i] = sb_bread(sb, block); 2905 if (!sbi->s_group_desc[i]) { 2906 ext4_msg(sb, KERN_ERR, 2907 "can't read group descriptor %d", i); 2908 db_count = i; 2909 goto failed_mount2; 2910 } 2911 } 2912 if (!ext4_check_descriptors(sb)) { 2913 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 2914 goto failed_mount2; 2915 } 2916 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2917 if (!ext4_fill_flex_info(sb)) { 2918 ext4_msg(sb, KERN_ERR, 2919 "unable to initialize " 2920 "flex_bg meta info!"); 2921 goto failed_mount2; 2922 } 2923 2924 sbi->s_gdb_count = db_count; 2925 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2926 spin_lock_init(&sbi->s_next_gen_lock); 2927 2928 sbi->s_stripe = ext4_get_stripe_size(sbi); 2929 sbi->s_max_writeback_mb_bump = 128; 2930 2931 /* 2932 * set up enough so that it can read an inode 2933 */ 2934 if (!test_opt(sb, NOLOAD) && 2935 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 2936 sb->s_op = &ext4_sops; 2937 else 2938 sb->s_op = &ext4_nojournal_sops; 2939 sb->s_export_op = &ext4_export_ops; 2940 sb->s_xattr = ext4_xattr_handlers; 2941#ifdef CONFIG_QUOTA 2942 sb->s_qcop = &ext4_qctl_operations; 2943 sb->dq_op = &ext4_quota_operations; 2944#endif 2945 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2946 mutex_init(&sbi->s_orphan_lock); 2947 mutex_init(&sbi->s_resize_lock); 2948 2949 sb->s_root = NULL; 2950 2951 needs_recovery = (es->s_last_orphan != 0 || 2952 EXT4_HAS_INCOMPAT_FEATURE(sb, 2953 EXT4_FEATURE_INCOMPAT_RECOVER)); 2954 2955 /* 2956 * The first inode we look at is the journal inode. Don't try 2957 * root first: it may be modified in the journal! 2958 */ 2959 if (!test_opt(sb, NOLOAD) && 2960 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2961 if (ext4_load_journal(sb, es, journal_devnum)) 2962 goto failed_mount3; 2963 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 2964 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2965 ext4_msg(sb, KERN_ERR, "required journal recovery " 2966 "suppressed and not mounted read-only"); 2967 goto failed_mount_wq; 2968 } else { 2969 clear_opt(sbi->s_mount_opt, DATA_FLAGS); 2970 set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 2971 sbi->s_journal = NULL; 2972 needs_recovery = 0; 2973 goto no_journal; 2974 } 2975 2976 if (ext4_blocks_count(es) > 0xffffffffULL && 2977 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2978 JBD2_FEATURE_INCOMPAT_64BIT)) { 2979 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 2980 goto failed_mount_wq; 2981 } 2982 2983 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2984 jbd2_journal_set_features(sbi->s_journal, 2985 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2986 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2987 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2988 jbd2_journal_set_features(sbi->s_journal, 2989 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2990 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2991 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2992 } else { 2993 jbd2_journal_clear_features(sbi->s_journal, 2994 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2995 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2996 } 2997 2998 /* We have now updated the journal if required, so we can 2999 * validate the data journaling mode. */ 3000 switch (test_opt(sb, DATA_FLAGS)) { 3001 case 0: 3002 /* No mode set, assume a default based on the journal 3003 * capabilities: ORDERED_DATA if the journal can 3004 * cope, else JOURNAL_DATA 3005 */ 3006 if (jbd2_journal_check_available_features 3007 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3008 set_opt(sbi->s_mount_opt, ORDERED_DATA); 3009 else 3010 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 3011 break; 3012 3013 case EXT4_MOUNT_ORDERED_DATA: 3014 case EXT4_MOUNT_WRITEBACK_DATA: 3015 if (!jbd2_journal_check_available_features 3016 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3017 ext4_msg(sb, KERN_ERR, "Journal does not support " 3018 "requested data journaling mode"); 3019 goto failed_mount_wq; 3020 } 3021 default: 3022 break; 3023 } 3024 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3025 3026no_journal: 3027 err = percpu_counter_init(&sbi->s_freeblocks_counter, 3028 ext4_count_free_blocks(sb)); 3029 if (!err) 3030 err = percpu_counter_init(&sbi->s_freeinodes_counter, 3031 ext4_count_free_inodes(sb)); 3032 if (!err) 3033 err = percpu_counter_init(&sbi->s_dirs_counter, 3034 ext4_count_dirs(sb)); 3035 if (!err) 3036 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 3037 if (err) { 3038 ext4_msg(sb, KERN_ERR, "insufficient memory"); 3039 goto failed_mount_wq; 3040 } 3041 3042 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten"); 3043 if (!EXT4_SB(sb)->dio_unwritten_wq) { 3044 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); 3045 goto failed_mount_wq; 3046 } 3047 3048 /* 3049 * The jbd2_journal_load will have done any necessary log recovery, 3050 * so we can safely mount the rest of the filesystem now. 3051 */ 3052 3053 root = ext4_iget(sb, EXT4_ROOT_INO); 3054 if (IS_ERR(root)) { 3055 ext4_msg(sb, KERN_ERR, "get root inode failed"); 3056 ret = PTR_ERR(root); 3057 goto failed_mount4; 3058 } 3059 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3060 iput(root); 3061 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 3062 goto failed_mount4; 3063 } 3064 sb->s_root = d_alloc_root(root); 3065 if (!sb->s_root) { 3066 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 3067 iput(root); 3068 ret = -ENOMEM; 3069 goto failed_mount4; 3070 } 3071 3072 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 3073 3074 /* determine the minimum size of new large inodes, if present */ 3075 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3076 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3077 EXT4_GOOD_OLD_INODE_SIZE; 3078 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3079 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 3080 if (sbi->s_want_extra_isize < 3081 le16_to_cpu(es->s_want_extra_isize)) 3082 sbi->s_want_extra_isize = 3083 le16_to_cpu(es->s_want_extra_isize); 3084 if (sbi->s_want_extra_isize < 3085 le16_to_cpu(es->s_min_extra_isize)) 3086 sbi->s_want_extra_isize = 3087 le16_to_cpu(es->s_min_extra_isize); 3088 } 3089 } 3090 /* Check if enough inode space is available */ 3091 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3092 sbi->s_inode_size) { 3093 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3094 EXT4_GOOD_OLD_INODE_SIZE; 3095 ext4_msg(sb, KERN_INFO, "required extra inode space not" 3096 "available"); 3097 } 3098 3099 if (test_opt(sb, DELALLOC) && 3100 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) { 3101 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - " 3102 "requested data journaling mode"); 3103 clear_opt(sbi->s_mount_opt, DELALLOC); 3104 } 3105 if (test_opt(sb, DIOREAD_NOLOCK)) { 3106 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3107 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " 3108 "option - requested data journaling mode"); 3109 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 3110 } 3111 if (sb->s_blocksize < PAGE_SIZE) { 3112 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " 3113 "option - block size is too small"); 3114 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); 3115 } 3116 } 3117 3118 err = ext4_setup_system_zone(sb); 3119 if (err) { 3120 ext4_msg(sb, KERN_ERR, "failed to initialize system " 3121 "zone (%d)", err); 3122 goto failed_mount4; 3123 } 3124 3125 ext4_ext_init(sb); 3126 err = ext4_mb_init(sb, needs_recovery); 3127 if (err) { 3128 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3129 err); 3130 goto failed_mount4; 3131 } 3132 3133 sbi->s_kobj.kset = ext4_kset; 3134 init_completion(&sbi->s_kobj_unregister); 3135 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 3136 "%s", sb->s_id); 3137 if (err) { 3138 ext4_mb_release(sb); 3139 ext4_ext_release(sb); 3140 goto failed_mount4; 3141 }; 3142 3143 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3144 ext4_orphan_cleanup(sb, es); 3145 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 3146 if (needs_recovery) { 3147 ext4_msg(sb, KERN_INFO, "recovery complete"); 3148 ext4_mark_recovery_complete(sb, es); 3149 } 3150 if (EXT4_SB(sb)->s_journal) { 3151 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3152 descr = " journalled data mode"; 3153 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3154 descr = " ordered data mode"; 3155 else 3156 descr = " writeback data mode"; 3157 } else 3158 descr = "out journal"; 3159 3160 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 3161 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 3162 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 3163 3164 init_timer(&sbi->s_err_report); 3165 sbi->s_err_report.function = print_daily_error_info; 3166 sbi->s_err_report.data = (unsigned long) sb; 3167 if (es->s_error_count) 3168 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 3169 3170 lock_kernel(); 3171 kfree(orig_data); 3172 return 0; 3173 3174cantfind_ext4: 3175 if (!silent) 3176 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 3177 goto failed_mount; 3178 3179failed_mount4: 3180 ext4_msg(sb, KERN_ERR, "mount failed"); 3181 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); 3182failed_mount_wq: 3183 ext4_release_system_zone(sb); 3184 if (sbi->s_journal) { 3185 jbd2_journal_destroy(sbi->s_journal); 3186 sbi->s_journal = NULL; 3187 } 3188 percpu_counter_destroy(&sbi->s_freeblocks_counter); 3189 percpu_counter_destroy(&sbi->s_freeinodes_counter); 3190 percpu_counter_destroy(&sbi->s_dirs_counter); 3191 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 3192failed_mount3: 3193 if (sbi->s_flex_groups) { 3194 if (is_vmalloc_addr(sbi->s_flex_groups)) 3195 vfree(sbi->s_flex_groups); 3196 else 3197 kfree(sbi->s_flex_groups); 3198 } 3199failed_mount2: 3200 for (i = 0; i < db_count; i++) 3201 brelse(sbi->s_group_desc[i]); 3202 kfree(sbi->s_group_desc); 3203failed_mount: 3204 if (sbi->s_proc) { 3205 remove_proc_entry(sb->s_id, ext4_proc_root); 3206 } 3207#ifdef CONFIG_QUOTA 3208 for (i = 0; i < MAXQUOTAS; i++) 3209 kfree(sbi->s_qf_names[i]); 3210#endif 3211 ext4_blkdev_remove(sbi); 3212 brelse(bh); 3213out_fail: 3214 sb->s_fs_info = NULL; 3215 kfree(sbi->s_blockgroup_lock); 3216 kfree(sbi); 3217 lock_kernel(); 3218out_free_orig: 3219 kfree(orig_data); 3220 return ret; 3221} 3222 3223/* 3224 * Setup any per-fs journal parameters now. We'll do this both on 3225 * initial mount, once the journal has been initialised but before we've 3226 * done any recovery; and again on any subsequent remount. 3227 */ 3228static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 3229{ 3230 struct ext4_sb_info *sbi = EXT4_SB(sb); 3231 3232 journal->j_commit_interval = sbi->s_commit_interval; 3233 journal->j_min_batch_time = sbi->s_min_batch_time; 3234 journal->j_max_batch_time = sbi->s_max_batch_time; 3235 3236 write_lock(&journal->j_state_lock); 3237 if (test_opt(sb, BARRIER)) 3238 journal->j_flags |= JBD2_BARRIER; 3239 else 3240 journal->j_flags &= ~JBD2_BARRIER; 3241 if (test_opt(sb, DATA_ERR_ABORT)) 3242 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 3243 else 3244 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 3245 write_unlock(&journal->j_state_lock); 3246} 3247 3248static journal_t *ext4_get_journal(struct super_block *sb, 3249 unsigned int journal_inum) 3250{ 3251 struct inode *journal_inode; 3252 journal_t *journal; 3253 3254 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3255 3256 /* First, test for the existence of a valid inode on disk. Bad 3257 * things happen if we iget() an unused inode, as the subsequent 3258 * iput() will try to delete it. */ 3259 3260 journal_inode = ext4_iget(sb, journal_inum); 3261 if (IS_ERR(journal_inode)) { 3262 ext4_msg(sb, KERN_ERR, "no journal found"); 3263 return NULL; 3264 } 3265 if (!journal_inode->i_nlink) { 3266 make_bad_inode(journal_inode); 3267 iput(journal_inode); 3268 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 3269 return NULL; 3270 } 3271 3272 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 3273 journal_inode, journal_inode->i_size); 3274 if (!S_ISREG(journal_inode->i_mode)) { 3275 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 3276 iput(journal_inode); 3277 return NULL; 3278 } 3279 3280 journal = jbd2_journal_init_inode(journal_inode); 3281 if (!journal) { 3282 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 3283 iput(journal_inode); 3284 return NULL; 3285 } 3286 journal->j_private = sb; 3287 ext4_init_journal_params(sb, journal); 3288 return journal; 3289} 3290 3291static journal_t *ext4_get_dev_journal(struct super_block *sb, 3292 dev_t j_dev) 3293{ 3294 struct buffer_head *bh; 3295 journal_t *journal; 3296 ext4_fsblk_t start; 3297 ext4_fsblk_t len; 3298 int hblock, blocksize; 3299 ext4_fsblk_t sb_block; 3300 unsigned long offset; 3301 struct ext4_super_block *es; 3302 struct block_device *bdev; 3303 3304 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3305 3306 bdev = ext4_blkdev_get(j_dev, sb); 3307 if (bdev == NULL) 3308 return NULL; 3309 3310 if (bd_claim(bdev, sb)) { 3311 ext4_msg(sb, KERN_ERR, 3312 "failed to claim external journal device"); 3313 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 3314 return NULL; 3315 } 3316 3317 blocksize = sb->s_blocksize; 3318 hblock = bdev_logical_block_size(bdev); 3319 if (blocksize < hblock) { 3320 ext4_msg(sb, KERN_ERR, 3321 "blocksize too small for journal device"); 3322 goto out_bdev; 3323 } 3324 3325 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 3326 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 3327 set_blocksize(bdev, blocksize); 3328 if (!(bh = __bread(bdev, sb_block, blocksize))) { 3329 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 3330 "external journal"); 3331 goto out_bdev; 3332 } 3333 3334 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3335 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 3336 !(le32_to_cpu(es->s_feature_incompat) & 3337 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 3338 ext4_msg(sb, KERN_ERR, "external journal has " 3339 "bad superblock"); 3340 brelse(bh); 3341 goto out_bdev; 3342 } 3343 3344 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 3345 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 3346 brelse(bh); 3347 goto out_bdev; 3348 } 3349 3350 len = ext4_blocks_count(es); 3351 start = sb_block + 1; 3352 brelse(bh); /* we're done with the superblock */ 3353 3354 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 3355 start, len, blocksize); 3356 if (!journal) { 3357 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 3358 goto out_bdev; 3359 } 3360 journal->j_private = sb; 3361 ll_rw_block(READ, 1, &journal->j_sb_buffer); 3362 wait_on_buffer(journal->j_sb_buffer); 3363 if (!buffer_uptodate(journal->j_sb_buffer)) { 3364 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 3365 goto out_journal; 3366 } 3367 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 3368 ext4_msg(sb, KERN_ERR, "External journal has more than one " 3369 "user (unsupported) - %d", 3370 be32_to_cpu(journal->j_superblock->s_nr_users)); 3371 goto out_journal; 3372 } 3373 EXT4_SB(sb)->journal_bdev = bdev; 3374 ext4_init_journal_params(sb, journal); 3375 return journal; 3376 3377out_journal: 3378 jbd2_journal_destroy(journal); 3379out_bdev: 3380 ext4_blkdev_put(bdev); 3381 return NULL; 3382} 3383 3384static int ext4_load_journal(struct super_block *sb, 3385 struct ext4_super_block *es, 3386 unsigned long journal_devnum) 3387{ 3388 journal_t *journal; 3389 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 3390 dev_t journal_dev; 3391 int err = 0; 3392 int really_read_only; 3393 3394 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3395 3396 if (journal_devnum && 3397 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3398 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 3399 "numbers have changed"); 3400 journal_dev = new_decode_dev(journal_devnum); 3401 } else 3402 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 3403 3404 really_read_only = bdev_read_only(sb->s_bdev); 3405 3406 /* 3407 * Are we loading a blank journal or performing recovery after a 3408 * crash? For recovery, we need to check in advance whether we 3409 * can get read-write access to the device. 3410 */ 3411 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3412 if (sb->s_flags & MS_RDONLY) { 3413 ext4_msg(sb, KERN_INFO, "INFO: recovery " 3414 "required on readonly filesystem"); 3415 if (really_read_only) { 3416 ext4_msg(sb, KERN_ERR, "write access " 3417 "unavailable, cannot proceed"); 3418 return -EROFS; 3419 } 3420 ext4_msg(sb, KERN_INFO, "write access will " 3421 "be enabled during recovery"); 3422 } 3423 } 3424 3425 if (journal_inum && journal_dev) { 3426 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 3427 "and inode journals!"); 3428 return -EINVAL; 3429 } 3430 3431 if (journal_inum) { 3432 if (!(journal = ext4_get_journal(sb, journal_inum))) 3433 return -EINVAL; 3434 } else { 3435 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 3436 return -EINVAL; 3437 } 3438 3439 if (!(journal->j_flags & JBD2_BARRIER)) 3440 ext4_msg(sb, KERN_INFO, "barriers disabled"); 3441 3442 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 3443 err = jbd2_journal_update_format(journal); 3444 if (err) { 3445 ext4_msg(sb, KERN_ERR, "error updating journal"); 3446 jbd2_journal_destroy(journal); 3447 return err; 3448 } 3449 } 3450 3451 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 3452 err = jbd2_journal_wipe(journal, !really_read_only); 3453 if (!err) { 3454 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 3455 if (save) 3456 memcpy(save, ((char *) es) + 3457 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 3458 err = jbd2_journal_load(journal); 3459 if (save) 3460 memcpy(((char *) es) + EXT4_S_ERR_START, 3461 save, EXT4_S_ERR_LEN); 3462 kfree(save); 3463 } 3464 3465 if (err) { 3466 ext4_msg(sb, KERN_ERR, "error loading journal"); 3467 jbd2_journal_destroy(journal); 3468 return err; 3469 } 3470 3471 EXT4_SB(sb)->s_journal = journal; 3472 ext4_clear_journal_err(sb, es); 3473 3474 if (journal_devnum && 3475 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3476 es->s_journal_dev = cpu_to_le32(journal_devnum); 3477 3478 /* Make sure we flush the recovery flag to disk. */ 3479 ext4_commit_super(sb, 1); 3480 } 3481 3482 return 0; 3483} 3484 3485static int ext4_commit_super(struct super_block *sb, int sync) 3486{ 3487 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 3488 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 3489 int error = 0; 3490 3491 if (!sbh) 3492 return error; 3493 if (buffer_write_io_error(sbh)) { 3494 /* 3495 * Oh, dear. A previous attempt to write the 3496 * superblock failed. This could happen because the 3497 * USB device was yanked out. Or it could happen to 3498 * be a transient write error and maybe the block will 3499 * be remapped. Nothing we can do but to retry the 3500 * write and hope for the best. 3501 */ 3502 ext4_msg(sb, KERN_ERR, "previous I/O error to " 3503 "superblock detected"); 3504 clear_buffer_write_io_error(sbh); 3505 set_buffer_uptodate(sbh); 3506 } 3507 /* 3508 * If the file system is mounted read-only, don't update the 3509 * superblock write time. This avoids updating the superblock 3510 * write time when we are mounting the root file system 3511 * read/only but we need to replay the journal; at that point, 3512 * for people who are east of GMT and who make their clock 3513 * tick in localtime for Windows bug-for-bug compatibility, 3514 * the clock is set in the future, and this will cause e2fsck 3515 * to complain and force a full file system check. 3516 */ 3517 if (!(sb->s_flags & MS_RDONLY)) 3518 es->s_wtime = cpu_to_le32(get_seconds()); 3519 if (sb->s_bdev->bd_part) 3520 es->s_kbytes_written = 3521 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 3522 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 3523 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 3524 else 3525 es->s_kbytes_written = 3526 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 3527 ext4_free_blocks_count_set(es, percpu_counter_sum_positive( 3528 &EXT4_SB(sb)->s_freeblocks_counter)); 3529 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive( 3530 &EXT4_SB(sb)->s_freeinodes_counter)); 3531 sb->s_dirt = 0; 3532 BUFFER_TRACE(sbh, "marking dirty"); 3533 mark_buffer_dirty(sbh); 3534 if (sync) { 3535 error = sync_dirty_buffer(sbh); 3536 if (error) 3537 return error; 3538 3539 error = buffer_write_io_error(sbh); 3540 if (error) { 3541 ext4_msg(sb, KERN_ERR, "I/O error while writing " 3542 "superblock"); 3543 clear_buffer_write_io_error(sbh); 3544 set_buffer_uptodate(sbh); 3545 } 3546 } 3547 return error; 3548} 3549 3550/* 3551 * Have we just finished recovery? If so, and if we are mounting (or 3552 * remounting) the filesystem readonly, then we will end up with a 3553 * consistent fs on disk. Record that fact. 3554 */ 3555static void ext4_mark_recovery_complete(struct super_block *sb, 3556 struct ext4_super_block *es) 3557{ 3558 journal_t *journal = EXT4_SB(sb)->s_journal; 3559 3560 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3561 BUG_ON(journal != NULL); 3562 return; 3563 } 3564 jbd2_journal_lock_updates(journal); 3565 if (jbd2_journal_flush(journal) < 0) 3566 goto out; 3567 3568 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 3569 sb->s_flags & MS_RDONLY) { 3570 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3571 ext4_commit_super(sb, 1); 3572 } 3573 3574out: 3575 jbd2_journal_unlock_updates(journal); 3576} 3577 3578/* 3579 * If we are mounting (or read-write remounting) a filesystem whose journal 3580 * has recorded an error from a previous lifetime, move that error to the 3581 * main filesystem now. 3582 */ 3583static void ext4_clear_journal_err(struct super_block *sb, 3584 struct ext4_super_block *es) 3585{ 3586 journal_t *journal; 3587 int j_errno; 3588 const char *errstr; 3589 3590 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3591 3592 journal = EXT4_SB(sb)->s_journal; 3593 3594 /* 3595 * Now check for any error status which may have been recorded in the 3596 * journal by a prior ext4_error() or ext4_abort() 3597 */ 3598 3599 j_errno = jbd2_journal_errno(journal); 3600 if (j_errno) { 3601 char nbuf[16]; 3602 3603 errstr = ext4_decode_error(sb, j_errno, nbuf); 3604 ext4_warning(sb, "Filesystem error recorded " 3605 "from previous mount: %s", errstr); 3606 ext4_warning(sb, "Marking fs in need of filesystem check."); 3607 3608 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 3609 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 3610 ext4_commit_super(sb, 1); 3611 3612 jbd2_journal_clear_err(journal); 3613 } 3614} 3615 3616/* 3617 * Force the running and committing transactions to commit, 3618 * and wait on the commit. 3619 */ 3620int ext4_force_commit(struct super_block *sb) 3621{ 3622 journal_t *journal; 3623 int ret = 0; 3624 3625 if (sb->s_flags & MS_RDONLY) 3626 return 0; 3627 3628 journal = EXT4_SB(sb)->s_journal; 3629 if (journal) { 3630 vfs_check_frozen(sb, SB_FREEZE_TRANS); 3631 ret = ext4_journal_force_commit(journal); 3632 } 3633 3634 return ret; 3635} 3636 3637static void ext4_write_super(struct super_block *sb) 3638{ 3639 lock_super(sb); 3640 ext4_commit_super(sb, 1); 3641 unlock_super(sb); 3642} 3643 3644static int ext4_sync_fs(struct super_block *sb, int wait) 3645{ 3646 int ret = 0; 3647 tid_t target; 3648 struct ext4_sb_info *sbi = EXT4_SB(sb); 3649 3650 trace_ext4_sync_fs(sb, wait); 3651 flush_workqueue(sbi->dio_unwritten_wq); 3652 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 3653 if (wait) 3654 jbd2_log_wait_commit(sbi->s_journal, target); 3655 } 3656 return ret; 3657} 3658 3659/* 3660 * LVM calls this function before a (read-only) snapshot is created. This 3661 * gives us a chance to flush the journal completely and mark the fs clean. 3662 */ 3663static int ext4_freeze(struct super_block *sb) 3664{ 3665 int error = 0; 3666 journal_t *journal; 3667 3668 if (sb->s_flags & MS_RDONLY) 3669 return 0; 3670 3671 journal = EXT4_SB(sb)->s_journal; 3672 3673 /* Now we set up the journal barrier. */ 3674 jbd2_journal_lock_updates(journal); 3675 3676 /* 3677 * Don't clear the needs_recovery flag if we failed to flush 3678 * the journal. 3679 */ 3680 error = jbd2_journal_flush(journal); 3681 if (error < 0) 3682 goto out; 3683 3684 /* Journal blocked and flushed, clear needs_recovery flag. */ 3685 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3686 error = ext4_commit_super(sb, 1); 3687out: 3688 /* we rely on s_frozen to stop further updates */ 3689 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3690 return error; 3691} 3692 3693/* 3694 * Called by LVM after the snapshot is done. We need to reset the RECOVER 3695 * flag here, even though the filesystem is not technically dirty yet. 3696 */ 3697static int ext4_unfreeze(struct super_block *sb) 3698{ 3699 if (sb->s_flags & MS_RDONLY) 3700 return 0; 3701 3702 lock_super(sb); 3703 /* Reset the needs_recovery flag before the fs is unlocked. */ 3704 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3705 ext4_commit_super(sb, 1); 3706 unlock_super(sb); 3707 return 0; 3708} 3709 3710static int ext4_remount(struct super_block *sb, int *flags, char *data) 3711{ 3712 struct ext4_super_block *es; 3713 struct ext4_sb_info *sbi = EXT4_SB(sb); 3714 ext4_fsblk_t n_blocks_count = 0; 3715 unsigned long old_sb_flags; 3716 struct ext4_mount_options old_opts; 3717 int enable_quota = 0; 3718 ext4_group_t g; 3719 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3720 int err; 3721#ifdef CONFIG_QUOTA 3722 int i; 3723#endif 3724 char *orig_data = kstrdup(data, GFP_KERNEL); 3725 3726 lock_kernel(); 3727 3728 /* Store the original options */ 3729 lock_super(sb); 3730 old_sb_flags = sb->s_flags; 3731 old_opts.s_mount_opt = sbi->s_mount_opt; 3732 old_opts.s_resuid = sbi->s_resuid; 3733 old_opts.s_resgid = sbi->s_resgid; 3734 old_opts.s_commit_interval = sbi->s_commit_interval; 3735 old_opts.s_min_batch_time = sbi->s_min_batch_time; 3736 old_opts.s_max_batch_time = sbi->s_max_batch_time; 3737#ifdef CONFIG_QUOTA 3738 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 3739 for (i = 0; i < MAXQUOTAS; i++) 3740 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 3741#endif 3742 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 3743 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 3744 3745 /* 3746 * Allow the "check" option to be passed as a remount option. 3747 */ 3748 if (!parse_options(data, sb, NULL, &journal_ioprio, 3749 &n_blocks_count, 1)) { 3750 err = -EINVAL; 3751 goto restore_opts; 3752 } 3753 3754 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 3755 ext4_abort(sb, "Abort forced by user"); 3756 3757 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3758 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3759 3760 es = sbi->s_es; 3761 3762 if (sbi->s_journal) { 3763 ext4_init_journal_params(sb, sbi->s_journal); 3764 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3765 } 3766 3767 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 3768 n_blocks_count > ext4_blocks_count(es)) { 3769 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 3770 err = -EROFS; 3771 goto restore_opts; 3772 } 3773 3774 if (*flags & MS_RDONLY) { 3775 err = dquot_suspend(sb, -1); 3776 if (err < 0) 3777 goto restore_opts; 3778 3779 /* 3780 * First of all, the unconditional stuff we have to do 3781 * to disable replay of the journal when we next remount 3782 */ 3783 sb->s_flags |= MS_RDONLY; 3784 3785 /* 3786 * OK, test if we are remounting a valid rw partition 3787 * readonly, and if so set the rdonly flag and then 3788 * mark the partition as valid again. 3789 */ 3790 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3791 (sbi->s_mount_state & EXT4_VALID_FS)) 3792 es->s_state = cpu_to_le16(sbi->s_mount_state); 3793 3794 if (sbi->s_journal) 3795 ext4_mark_recovery_complete(sb, es); 3796 } else { 3797 /* Make sure we can mount this feature set readwrite */ 3798 if (!ext4_feature_set_ok(sb, 0)) { 3799 err = -EROFS; 3800 goto restore_opts; 3801 } 3802 /* 3803 * Make sure the group descriptor checksums 3804 * are sane. If they aren't, refuse to remount r/w. 3805 */ 3806 for (g = 0; g < sbi->s_groups_count; g++) { 3807 struct ext4_group_desc *gdp = 3808 ext4_get_group_desc(sb, g, NULL); 3809 3810 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 3811 ext4_msg(sb, KERN_ERR, 3812 "ext4_remount: Checksum for group %u failed (%u!=%u)", 3813 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 3814 le16_to_cpu(gdp->bg_checksum)); 3815 err = -EINVAL; 3816 goto restore_opts; 3817 } 3818 } 3819 3820 /* 3821 * If we have an unprocessed orphan list hanging 3822 * around from a previously readonly bdev mount, 3823 * require a full umount/remount for now. 3824 */ 3825 if (es->s_last_orphan) { 3826 ext4_msg(sb, KERN_WARNING, "Couldn't " 3827 "remount RDWR because of unprocessed " 3828 "orphan inode list. Please " 3829 "umount/remount instead"); 3830 err = -EINVAL; 3831 goto restore_opts; 3832 } 3833 3834 /* 3835 * Mounting a RDONLY partition read-write, so reread 3836 * and store the current valid flag. (It may have 3837 * been changed by e2fsck since we originally mounted 3838 * the partition.) 3839 */ 3840 if (sbi->s_journal) 3841 ext4_clear_journal_err(sb, es); 3842 sbi->s_mount_state = le16_to_cpu(es->s_state); 3843 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3844 goto restore_opts; 3845 if (!ext4_setup_super(sb, es, 0)) 3846 sb->s_flags &= ~MS_RDONLY; 3847 enable_quota = 1; 3848 } 3849 } 3850 ext4_setup_system_zone(sb); 3851 if (sbi->s_journal == NULL) 3852 ext4_commit_super(sb, 1); 3853 3854#ifdef CONFIG_QUOTA 3855 /* Release old quota file names */ 3856 for (i = 0; i < MAXQUOTAS; i++) 3857 if (old_opts.s_qf_names[i] && 3858 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3859 kfree(old_opts.s_qf_names[i]); 3860#endif 3861 unlock_super(sb); 3862 unlock_kernel(); 3863 if (enable_quota) 3864 dquot_resume(sb, -1); 3865 3866 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 3867 kfree(orig_data); 3868 return 0; 3869 3870restore_opts: 3871 sb->s_flags = old_sb_flags; 3872 sbi->s_mount_opt = old_opts.s_mount_opt; 3873 sbi->s_resuid = old_opts.s_resuid; 3874 sbi->s_resgid = old_opts.s_resgid; 3875 sbi->s_commit_interval = old_opts.s_commit_interval; 3876 sbi->s_min_batch_time = old_opts.s_min_batch_time; 3877 sbi->s_max_batch_time = old_opts.s_max_batch_time; 3878#ifdef CONFIG_QUOTA 3879 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3880 for (i = 0; i < MAXQUOTAS; i++) { 3881 if (sbi->s_qf_names[i] && 3882 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3883 kfree(sbi->s_qf_names[i]); 3884 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3885 } 3886#endif 3887 unlock_super(sb); 3888 unlock_kernel(); 3889 kfree(orig_data); 3890 return err; 3891} 3892 3893static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3894{ 3895 struct super_block *sb = dentry->d_sb; 3896 struct ext4_sb_info *sbi = EXT4_SB(sb); 3897 struct ext4_super_block *es = sbi->s_es; 3898 u64 fsid; 3899 3900 if (test_opt(sb, MINIX_DF)) { 3901 sbi->s_overhead_last = 0; 3902 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3903 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3904 ext4_fsblk_t overhead = 0; 3905 3906 /* 3907 * Compute the overhead (FS structures). This is constant 3908 * for a given filesystem unless the number of block groups 3909 * changes so we cache the previous value until it does. 3910 */ 3911 3912 /* 3913 * All of the blocks before first_data_block are 3914 * overhead 3915 */ 3916 overhead = le32_to_cpu(es->s_first_data_block); 3917 3918 /* 3919 * Add the overhead attributed to the superblock and 3920 * block group descriptors. If the sparse superblocks 3921 * feature is turned on, then not all groups have this. 3922 */ 3923 for (i = 0; i < ngroups; i++) { 3924 overhead += ext4_bg_has_super(sb, i) + 3925 ext4_bg_num_gdb(sb, i); 3926 cond_resched(); 3927 } 3928 3929 /* 3930 * Every block group has an inode bitmap, a block 3931 * bitmap, and an inode table. 3932 */ 3933 overhead += ngroups * (2 + sbi->s_itb_per_group); 3934 sbi->s_overhead_last = overhead; 3935 smp_wmb(); 3936 sbi->s_blocks_last = ext4_blocks_count(es); 3937 } 3938 3939 buf->f_type = EXT4_SUPER_MAGIC; 3940 buf->f_bsize = sb->s_blocksize; 3941 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 3942 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 3943 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 3944 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3945 if (buf->f_bfree < ext4_r_blocks_count(es)) 3946 buf->f_bavail = 0; 3947 buf->f_files = le32_to_cpu(es->s_inodes_count); 3948 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 3949 buf->f_namelen = EXT4_NAME_LEN; 3950 fsid = le64_to_cpup((void *)es->s_uuid) ^ 3951 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3952 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3953 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3954 3955 return 0; 3956} 3957 3958/* Helper function for writing quotas on sync - we need to start transaction 3959 * before quota file is locked for write. Otherwise the are possible deadlocks: 3960 * Process 1 Process 2 3961 * ext4_create() quota_sync() 3962 * jbd2_journal_start() write_dquot() 3963 * dquot_initialize() down(dqio_mutex) 3964 * down(dqio_mutex) jbd2_journal_start() 3965 * 3966 */ 3967 3968#ifdef CONFIG_QUOTA 3969 3970static inline struct inode *dquot_to_inode(struct dquot *dquot) 3971{ 3972 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3973} 3974 3975static int ext4_write_dquot(struct dquot *dquot) 3976{ 3977 int ret, err; 3978 handle_t *handle; 3979 struct inode *inode; 3980 3981 inode = dquot_to_inode(dquot); 3982 handle = ext4_journal_start(inode, 3983 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3984 if (IS_ERR(handle)) 3985 return PTR_ERR(handle); 3986 ret = dquot_commit(dquot); 3987 err = ext4_journal_stop(handle); 3988 if (!ret) 3989 ret = err; 3990 return ret; 3991} 3992 3993static int ext4_acquire_dquot(struct dquot *dquot) 3994{ 3995 int ret, err; 3996 handle_t *handle; 3997 3998 handle = ext4_journal_start(dquot_to_inode(dquot), 3999 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 4000 if (IS_ERR(handle)) 4001 return PTR_ERR(handle); 4002 ret = dquot_acquire(dquot); 4003 err = ext4_journal_stop(handle); 4004 if (!ret) 4005 ret = err; 4006 return ret; 4007} 4008 4009static int ext4_release_dquot(struct dquot *dquot) 4010{ 4011 int ret, err; 4012 handle_t *handle; 4013 4014 handle = ext4_journal_start(dquot_to_inode(dquot), 4015 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 4016 if (IS_ERR(handle)) { 4017 /* Release dquot anyway to avoid endless cycle in dqput() */ 4018 dquot_release(dquot); 4019 return PTR_ERR(handle); 4020 } 4021 ret = dquot_release(dquot); 4022 err = ext4_journal_stop(handle); 4023 if (!ret) 4024 ret = err; 4025 return ret; 4026} 4027 4028static int ext4_mark_dquot_dirty(struct dquot *dquot) 4029{ 4030 /* Are we journaling quotas? */ 4031 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 4032 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 4033 dquot_mark_dquot_dirty(dquot); 4034 return ext4_write_dquot(dquot); 4035 } else { 4036 return dquot_mark_dquot_dirty(dquot); 4037 } 4038} 4039 4040static int ext4_write_info(struct super_block *sb, int type) 4041{ 4042 int ret, err; 4043 handle_t *handle; 4044 4045 /* Data block + inode block */ 4046 handle = ext4_journal_start(sb->s_root->d_inode, 2); 4047 if (IS_ERR(handle)) 4048 return PTR_ERR(handle); 4049 ret = dquot_commit_info(sb, type); 4050 err = ext4_journal_stop(handle); 4051 if (!ret) 4052 ret = err; 4053 return ret; 4054} 4055 4056/* 4057 * Turn on quotas during mount time - we need to find 4058 * the quota file and such... 4059 */ 4060static int ext4_quota_on_mount(struct super_block *sb, int type) 4061{ 4062 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 4063 EXT4_SB(sb)->s_jquota_fmt, type); 4064} 4065 4066/* 4067 * Standard function to be called on quota_on 4068 */ 4069static int ext4_quota_on(struct super_block *sb, int type, int format_id, 4070 char *name) 4071{ 4072 int err; 4073 struct path path; 4074 4075 if (!test_opt(sb, QUOTA)) 4076 return -EINVAL; 4077 4078 err = kern_path(name, LOOKUP_FOLLOW, &path); 4079 if (err) 4080 return err; 4081 4082 /* Quotafile not on the same filesystem? */ 4083 if (path.mnt->mnt_sb != sb) { 4084 path_put(&path); 4085 return -EXDEV; 4086 } 4087 /* Journaling quota? */ 4088 if (EXT4_SB(sb)->s_qf_names[type]) { 4089 /* Quotafile not in fs root? */ 4090 if (path.dentry->d_parent != sb->s_root) 4091 ext4_msg(sb, KERN_WARNING, 4092 "Quota file not on filesystem root. " 4093 "Journaled quota will not work"); 4094 } 4095 4096 /* 4097 * When we journal data on quota file, we have to flush journal to see 4098 * all updates to the file when we bypass pagecache... 4099 */ 4100 if (EXT4_SB(sb)->s_journal && 4101 ext4_should_journal_data(path.dentry->d_inode)) { 4102 /* 4103 * We don't need to lock updates but journal_flush() could 4104 * otherwise be livelocked... 4105 */ 4106 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 4107 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 4108 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4109 if (err) { 4110 path_put(&path); 4111 return err; 4112 } 4113 } 4114 4115 err = dquot_quota_on_path(sb, type, format_id, &path); 4116 path_put(&path); 4117 return err; 4118} 4119 4120static int ext4_quota_off(struct super_block *sb, int type) 4121{ 4122 /* Force all delayed allocation blocks to be allocated */ 4123 if (test_opt(sb, DELALLOC)) { 4124 down_read(&sb->s_umount); 4125 sync_filesystem(sb); 4126 up_read(&sb->s_umount); 4127 } 4128 4129 return dquot_quota_off(sb, type); 4130} 4131 4132/* Read data from quotafile - avoid pagecache and such because we cannot afford 4133 * acquiring the locks... As quota files are never truncated and quota code 4134 * itself serializes the operations (and noone else should touch the files) 4135 * we don't have to be afraid of races */ 4136static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 4137 size_t len, loff_t off) 4138{ 4139 struct inode *inode = sb_dqopt(sb)->files[type]; 4140 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4141 int err = 0; 4142 int offset = off & (sb->s_blocksize - 1); 4143 int tocopy; 4144 size_t toread; 4145 struct buffer_head *bh; 4146 loff_t i_size = i_size_read(inode); 4147 4148 if (off > i_size) 4149 return 0; 4150 if (off+len > i_size) 4151 len = i_size-off; 4152 toread = len; 4153 while (toread > 0) { 4154 tocopy = sb->s_blocksize - offset < toread ? 4155 sb->s_blocksize - offset : toread; 4156 bh = ext4_bread(NULL, inode, blk, 0, &err); 4157 if (err) 4158 return err; 4159 if (!bh) /* A hole? */ 4160 memset(data, 0, tocopy); 4161 else 4162 memcpy(data, bh->b_data+offset, tocopy); 4163 brelse(bh); 4164 offset = 0; 4165 toread -= tocopy; 4166 data += tocopy; 4167 blk++; 4168 } 4169 return len; 4170} 4171 4172/* Write to quotafile (we know the transaction is already started and has 4173 * enough credits) */ 4174static ssize_t ext4_quota_write(struct super_block *sb, int type, 4175 const char *data, size_t len, loff_t off) 4176{ 4177 struct inode *inode = sb_dqopt(sb)->files[type]; 4178 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4179 int err = 0; 4180 int offset = off & (sb->s_blocksize - 1); 4181 struct buffer_head *bh; 4182 handle_t *handle = journal_current_handle(); 4183 4184 if (EXT4_SB(sb)->s_journal && !handle) { 4185 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4186 " cancelled because transaction is not started", 4187 (unsigned long long)off, (unsigned long long)len); 4188 return -EIO; 4189 } 4190 /* 4191 * Since we account only one data block in transaction credits, 4192 * then it is impossible to cross a block boundary. 4193 */ 4194 if (sb->s_blocksize - offset < len) { 4195 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4196 " cancelled because not block aligned", 4197 (unsigned long long)off, (unsigned long long)len); 4198 return -EIO; 4199 } 4200 4201 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 4202 bh = ext4_bread(handle, inode, blk, 1, &err); 4203 if (!bh) 4204 goto out; 4205 err = ext4_journal_get_write_access(handle, bh); 4206 if (err) { 4207 brelse(bh); 4208 goto out; 4209 } 4210 lock_buffer(bh); 4211 memcpy(bh->b_data+offset, data, len); 4212 flush_dcache_page(bh->b_page); 4213 unlock_buffer(bh); 4214 err = ext4_handle_dirty_metadata(handle, NULL, bh); 4215 brelse(bh); 4216out: 4217 if (err) { 4218 mutex_unlock(&inode->i_mutex); 4219 return err; 4220 } 4221 if (inode->i_size < off + len) { 4222 i_size_write(inode, off + len); 4223 EXT4_I(inode)->i_disksize = inode->i_size; 4224 } 4225 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4226 ext4_mark_inode_dirty(handle, inode); 4227 mutex_unlock(&inode->i_mutex); 4228 return len; 4229} 4230 4231#endif 4232 4233static int ext4_get_sb(struct file_system_type *fs_type, int flags, 4234 const char *dev_name, void *data, struct vfsmount *mnt) 4235{ 4236 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt); 4237} 4238 4239#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && \ 4240 defined(CONFIG_EXT4_USE_FOR_EXT23) 4241static struct file_system_type ext2_fs_type = { 4242 .owner = THIS_MODULE, 4243 .name = "ext2", 4244 .get_sb = ext4_get_sb, 4245 .kill_sb = kill_block_super, 4246 .fs_flags = FS_REQUIRES_DEV, 4247}; 4248 4249static inline void register_as_ext2(void) 4250{ 4251 int err = register_filesystem(&ext2_fs_type); 4252 if (err) 4253 printk(KERN_WARNING 4254 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 4255} 4256 4257static inline void unregister_as_ext2(void) 4258{ 4259 unregister_filesystem(&ext2_fs_type); 4260} 4261MODULE_ALIAS("ext2"); 4262#else 4263static inline void register_as_ext2(void) { } 4264static inline void unregister_as_ext2(void) { } 4265#endif 4266 4267#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && \ 4268 defined(CONFIG_EXT4_USE_FOR_EXT23) 4269static inline void register_as_ext3(void) 4270{ 4271 int err = register_filesystem(&ext3_fs_type); 4272 if (err) 4273 printk(KERN_WARNING 4274 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 4275} 4276 4277static inline void unregister_as_ext3(void) 4278{ 4279 unregister_filesystem(&ext3_fs_type); 4280} 4281MODULE_ALIAS("ext3"); 4282#else 4283static inline void register_as_ext3(void) { } 4284static inline void unregister_as_ext3(void) { } 4285#endif 4286 4287static struct file_system_type ext4_fs_type = { 4288 .owner = THIS_MODULE, 4289 .name = "ext4", 4290 .get_sb = ext4_get_sb, 4291 .kill_sb = kill_block_super, 4292 .fs_flags = FS_REQUIRES_DEV, 4293}; 4294 4295static int __init init_ext4_fs(void) 4296{ 4297 int err; 4298 4299 ext4_check_flag_values(); 4300 err = init_ext4_system_zone(); 4301 if (err) 4302 return err; 4303 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 4304 if (!ext4_kset) 4305 goto out4; 4306 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 4307 err = init_ext4_mballoc(); 4308 if (err) 4309 goto out3; 4310 4311 err = init_ext4_xattr(); 4312 if (err) 4313 goto out2; 4314 err = init_inodecache(); 4315 if (err) 4316 goto out1; 4317 register_as_ext2(); 4318 register_as_ext3(); 4319 err = register_filesystem(&ext4_fs_type); 4320 if (err) 4321 goto out; 4322 return 0; 4323out: 4324 unregister_as_ext2(); 4325 unregister_as_ext3(); 4326 destroy_inodecache(); 4327out1: 4328 exit_ext4_xattr(); 4329out2: 4330 exit_ext4_mballoc(); 4331out3: 4332 remove_proc_entry("fs/ext4", NULL); 4333 kset_unregister(ext4_kset); 4334out4: 4335 exit_ext4_system_zone(); 4336 return err; 4337} 4338 4339static void __exit exit_ext4_fs(void) 4340{ 4341 unregister_as_ext2(); 4342 unregister_as_ext3(); 4343 unregister_filesystem(&ext4_fs_type); 4344 destroy_inodecache(); 4345 exit_ext4_xattr(); 4346 exit_ext4_mballoc(); 4347 remove_proc_entry("fs/ext4", NULL); 4348 kset_unregister(ext4_kset); 4349 exit_ext4_system_zone(); 4350} 4351 4352MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 4353MODULE_DESCRIPTION("Fourth Extended Filesystem"); 4354MODULE_LICENSE("GPL"); 4355module_init(init_ext4_fs) 4356module_exit(exit_ext4_fs) 4357