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ext4: deprecate obsoleted mount options
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blobc832508d551500455cd164c0969801e74148b292
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
53 struct proc_dir_entry *ext4_proc_root;
54 static struct kset *ext4_kset;
55
56 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
57 unsigned long journal_devnum);
58 static int ext4_commit_super(struct super_block *sb, int sync);
59 static void ext4_mark_recovery_complete(struct super_block *sb,
60 struct ext4_super_block *es);
61 static void ext4_clear_journal_err(struct super_block *sb,
62 struct ext4_super_block *es);
63 static int ext4_sync_fs(struct super_block *sb, int wait);
64 static const char *ext4_decode_error(struct super_block *sb, int errno,
65 char nbuf[16]);
66 static int ext4_remount(struct super_block *sb, int *flags, char *data);
67 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
68 static int ext4_unfreeze(struct super_block *sb);
69 static void ext4_write_super(struct super_block *sb);
70 static int ext4_freeze(struct super_block *sb);
71
72
73 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
74 struct ext4_group_desc *bg)
75 {
76 return le32_to_cpu(bg->bg_block_bitmap_lo) |
77 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
78 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
79 }
80
81 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
82 struct ext4_group_desc *bg)
83 {
84 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
85 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
86 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
87 }
88
89 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
90 struct ext4_group_desc *bg)
91 {
92 return le32_to_cpu(bg->bg_inode_table_lo) |
93 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
94 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
95 }
96
97 __u32 ext4_free_blks_count(struct super_block *sb,
98 struct ext4_group_desc *bg)
99 {
100 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
101 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
102 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
103 }
104
105 __u32 ext4_free_inodes_count(struct super_block *sb,
106 struct ext4_group_desc *bg)
107 {
108 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
109 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
110 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
111 }
112
113 __u32 ext4_used_dirs_count(struct super_block *sb,
114 struct ext4_group_desc *bg)
115 {
116 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
117 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
118 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
119 }
120
121 __u32 ext4_itable_unused_count(struct super_block *sb,
122 struct ext4_group_desc *bg)
123 {
124 return le16_to_cpu(bg->bg_itable_unused_lo) |
125 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
126 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
127 }
128
129 void ext4_block_bitmap_set(struct super_block *sb,
130 struct ext4_group_desc *bg, ext4_fsblk_t blk)
131 {
132 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
133 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
134 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
135 }
136
137 void ext4_inode_bitmap_set(struct super_block *sb,
138 struct ext4_group_desc *bg, ext4_fsblk_t blk)
139 {
140 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
141 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
142 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
143 }
144
145 void ext4_inode_table_set(struct super_block *sb,
146 struct ext4_group_desc *bg, ext4_fsblk_t blk)
147 {
148 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
149 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
150 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
151 }
152
153 void ext4_free_blks_set(struct super_block *sb,
154 struct ext4_group_desc *bg, __u32 count)
155 {
156 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
157 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
158 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
159 }
160
161 void ext4_free_inodes_set(struct super_block *sb,
162 struct ext4_group_desc *bg, __u32 count)
163 {
164 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
165 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
166 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
167 }
168
169 void ext4_used_dirs_set(struct super_block *sb,
170 struct ext4_group_desc *bg, __u32 count)
171 {
172 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
173 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
174 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
175 }
176
177 void ext4_itable_unused_set(struct super_block *sb,
178 struct ext4_group_desc *bg, __u32 count)
179 {
180 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
181 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
182 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
183 }
184
185
186 /* Just increment the non-pointer handle value */
187 static handle_t *ext4_get_nojournal(void)
188 {
189 handle_t *handle = current->journal_info;
190 unsigned long ref_cnt = (unsigned long)handle;
191
192 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
193
194 ref_cnt++;
195 handle = (handle_t *)ref_cnt;
196
197 current->journal_info = handle;
198 return handle;
199 }
200
201
202 /* Decrement the non-pointer handle value */
203 static void ext4_put_nojournal(handle_t *handle)
204 {
205 unsigned long ref_cnt = (unsigned long)handle;
206
207 BUG_ON(ref_cnt == 0);
208
209 ref_cnt--;
210 handle = (handle_t *)ref_cnt;
211
212 current->journal_info = handle;
213 }
214
215 /*
216 * Wrappers for jbd2_journal_start/end.
217 *
218 * The only special thing we need to do here is to make sure that all
219 * journal_end calls result in the superblock being marked dirty, so
220 * that sync() will call the filesystem's write_super callback if
221 * appropriate.
222 */
223 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
224 {
225 journal_t *journal;
226
227 if (sb->s_flags & MS_RDONLY)
228 return ERR_PTR(-EROFS);
229
230 /* Special case here: if the journal has aborted behind our
231 * backs (eg. EIO in the commit thread), then we still need to
232 * take the FS itself readonly cleanly. */
233 journal = EXT4_SB(sb)->s_journal;
234 if (journal) {
235 if (is_journal_aborted(journal)) {
236 ext4_abort(sb, __func__, "Detected aborted journal");
237 return ERR_PTR(-EROFS);
238 }
239 return jbd2_journal_start(journal, nblocks);
240 }
241 return ext4_get_nojournal();
242 }
243
244 /*
245 * The only special thing we need to do here is to make sure that all
246 * jbd2_journal_stop calls result in the superblock being marked dirty, so
247 * that sync() will call the filesystem's write_super callback if
248 * appropriate.
249 */
250 int __ext4_journal_stop(const char *where, handle_t *handle)
251 {
252 struct super_block *sb;
253 int err;
254 int rc;
255
256 if (!ext4_handle_valid(handle)) {
257 ext4_put_nojournal(handle);
258 return 0;
259 }
260 sb = handle->h_transaction->t_journal->j_private;
261 err = handle->h_err;
262 rc = jbd2_journal_stop(handle);
263
264 if (!err)
265 err = rc;
266 if (err)
267 __ext4_std_error(sb, where, err);
268 return err;
269 }
270
271 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
272 struct buffer_head *bh, handle_t *handle, int err)
273 {
274 char nbuf[16];
275 const char *errstr = ext4_decode_error(NULL, err, nbuf);
276
277 BUG_ON(!ext4_handle_valid(handle));
278
279 if (bh)
280 BUFFER_TRACE(bh, "abort");
281
282 if (!handle->h_err)
283 handle->h_err = err;
284
285 if (is_handle_aborted(handle))
286 return;
287
288 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
289 caller, errstr, err_fn);
290
291 jbd2_journal_abort_handle(handle);
292 }
293
294 /* Deal with the reporting of failure conditions on a filesystem such as
295 * inconsistencies detected or read IO failures.
296 *
297 * On ext2, we can store the error state of the filesystem in the
298 * superblock. That is not possible on ext4, because we may have other
299 * write ordering constraints on the superblock which prevent us from
300 * writing it out straight away; and given that the journal is about to
301 * be aborted, we can't rely on the current, or future, transactions to
302 * write out the superblock safely.
303 *
304 * We'll just use the jbd2_journal_abort() error code to record an error in
305 * the journal instead. On recovery, the journal will compain about
306 * that error until we've noted it down and cleared it.
307 */
308
309 static void ext4_handle_error(struct super_block *sb)
310 {
311 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
312
313 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
314 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
315
316 if (sb->s_flags & MS_RDONLY)
317 return;
318
319 if (!test_opt(sb, ERRORS_CONT)) {
320 journal_t *journal = EXT4_SB(sb)->s_journal;
321
322 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
323 if (journal)
324 jbd2_journal_abort(journal, -EIO);
325 }
326 if (test_opt(sb, ERRORS_RO)) {
327 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
328 sb->s_flags |= MS_RDONLY;
329 }
330 ext4_commit_super(sb, 1);
331 if (test_opt(sb, ERRORS_PANIC))
332 panic("EXT4-fs (device %s): panic forced after error\n",
333 sb->s_id);
334 }
335
336 void __ext4_error(struct super_block *sb, const char *function,
337 const char *fmt, ...)
338 {
339 va_list args;
340
341 va_start(args, fmt);
342 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
343 vprintk(fmt, args);
344 printk("\n");
345 va_end(args);
346
347 ext4_handle_error(sb);
348 }
349
350 static const char *ext4_decode_error(struct super_block *sb, int errno,
351 char nbuf[16])
352 {
353 char *errstr = NULL;
354
355 switch (errno) {
356 case -EIO:
357 errstr = "IO failure";
358 break;
359 case -ENOMEM:
360 errstr = "Out of memory";
361 break;
362 case -EROFS:
363 if (!sb || (EXT4_SB(sb)->s_journal &&
364 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
365 errstr = "Journal has aborted";
366 else
367 errstr = "Readonly filesystem";
368 break;
369 default:
370 /* If the caller passed in an extra buffer for unknown
371 * errors, textualise them now. Else we just return
372 * NULL. */
373 if (nbuf) {
374 /* Check for truncated error codes... */
375 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
376 errstr = nbuf;
377 }
378 break;
379 }
380
381 return errstr;
382 }
383
384 /* __ext4_std_error decodes expected errors from journaling functions
385 * automatically and invokes the appropriate error response. */
386
387 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
388 {
389 char nbuf[16];
390 const char *errstr;
391
392 /* Special case: if the error is EROFS, and we're not already
393 * inside a transaction, then there's really no point in logging
394 * an error. */
395 if (errno == -EROFS && journal_current_handle() == NULL &&
396 (sb->s_flags & MS_RDONLY))
397 return;
398
399 errstr = ext4_decode_error(sb, errno, nbuf);
400 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
401 sb->s_id, function, errstr);
402
403 ext4_handle_error(sb);
404 }
405
406 /*
407 * ext4_abort is a much stronger failure handler than ext4_error. The
408 * abort function may be used to deal with unrecoverable failures such
409 * as journal IO errors or ENOMEM at a critical moment in log management.
410 *
411 * We unconditionally force the filesystem into an ABORT|READONLY state,
412 * unless the error response on the fs has been set to panic in which
413 * case we take the easy way out and panic immediately.
414 */
415
416 void ext4_abort(struct super_block *sb, const char *function,
417 const char *fmt, ...)
418 {
419 va_list args;
420
421 va_start(args, fmt);
422 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
423 vprintk(fmt, args);
424 printk("\n");
425 va_end(args);
426
427 if (test_opt(sb, ERRORS_PANIC))
428 panic("EXT4-fs panic from previous error\n");
429
430 if (sb->s_flags & MS_RDONLY)
431 return;
432
433 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
434 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
435 sb->s_flags |= MS_RDONLY;
436 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
437 if (EXT4_SB(sb)->s_journal)
438 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
439 }
440
441 void ext4_msg (struct super_block * sb, const char *prefix,
442 const char *fmt, ...)
443 {
444 va_list args;
445
446 va_start(args, fmt);
447 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
448 vprintk(fmt, args);
449 printk("\n");
450 va_end(args);
451 }
452
453 void __ext4_warning(struct super_block *sb, const char *function,
454 const char *fmt, ...)
455 {
456 va_list args;
457
458 va_start(args, fmt);
459 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
460 sb->s_id, function);
461 vprintk(fmt, args);
462 printk("\n");
463 va_end(args);
464 }
465
466 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
467 const char *function, const char *fmt, ...)
468 __releases(bitlock)
469 __acquires(bitlock)
470 {
471 va_list args;
472 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
473
474 va_start(args, fmt);
475 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
476 vprintk(fmt, args);
477 printk("\n");
478 va_end(args);
479
480 if (test_opt(sb, ERRORS_CONT)) {
481 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
482 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
483 ext4_commit_super(sb, 0);
484 return;
485 }
486 ext4_unlock_group(sb, grp);
487 ext4_handle_error(sb);
488 /*
489 * We only get here in the ERRORS_RO case; relocking the group
490 * may be dangerous, but nothing bad will happen since the
491 * filesystem will have already been marked read/only and the
492 * journal has been aborted. We return 1 as a hint to callers
493 * who might what to use the return value from
494 * ext4_grp_locked_error() to distinguish beween the
495 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
496 * aggressively from the ext4 function in question, with a
497 * more appropriate error code.
498 */
499 ext4_lock_group(sb, grp);
500 return;
501 }
502
503 void ext4_update_dynamic_rev(struct super_block *sb)
504 {
505 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
506
507 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
508 return;
509
510 ext4_warning(sb,
511 "updating to rev %d because of new feature flag, "
512 "running e2fsck is recommended",
513 EXT4_DYNAMIC_REV);
514
515 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
516 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
517 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
518 /* leave es->s_feature_*compat flags alone */
519 /* es->s_uuid will be set by e2fsck if empty */
520
521 /*
522 * The rest of the superblock fields should be zero, and if not it
523 * means they are likely already in use, so leave them alone. We
524 * can leave it up to e2fsck to clean up any inconsistencies there.
525 */
526 }
527
528 /*
529 * Open the external journal device
530 */
531 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
532 {
533 struct block_device *bdev;
534 char b[BDEVNAME_SIZE];
535
536 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
537 if (IS_ERR(bdev))
538 goto fail;
539 return bdev;
540
541 fail:
542 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
543 __bdevname(dev, b), PTR_ERR(bdev));
544 return NULL;
545 }
546
547 /*
548 * Release the journal device
549 */
550 static int ext4_blkdev_put(struct block_device *bdev)
551 {
552 bd_release(bdev);
553 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
554 }
555
556 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
557 {
558 struct block_device *bdev;
559 int ret = -ENODEV;
560
561 bdev = sbi->journal_bdev;
562 if (bdev) {
563 ret = ext4_blkdev_put(bdev);
564 sbi->journal_bdev = NULL;
565 }
566 return ret;
567 }
568
569 static inline struct inode *orphan_list_entry(struct list_head *l)
570 {
571 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
572 }
573
574 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
575 {
576 struct list_head *l;
577
578 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
579 le32_to_cpu(sbi->s_es->s_last_orphan));
580
581 printk(KERN_ERR "sb_info orphan list:\n");
582 list_for_each(l, &sbi->s_orphan) {
583 struct inode *inode = orphan_list_entry(l);
584 printk(KERN_ERR " "
585 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
586 inode->i_sb->s_id, inode->i_ino, inode,
587 inode->i_mode, inode->i_nlink,
588 NEXT_ORPHAN(inode));
589 }
590 }
591
592 static void ext4_put_super(struct super_block *sb)
593 {
594 struct ext4_sb_info *sbi = EXT4_SB(sb);
595 struct ext4_super_block *es = sbi->s_es;
596 int i, err;
597
598 flush_workqueue(sbi->dio_unwritten_wq);
599 destroy_workqueue(sbi->dio_unwritten_wq);
600
601 lock_super(sb);
602 lock_kernel();
603 if (sb->s_dirt)
604 ext4_commit_super(sb, 1);
605
606 if (sbi->s_journal) {
607 err = jbd2_journal_destroy(sbi->s_journal);
608 sbi->s_journal = NULL;
609 if (err < 0)
610 ext4_abort(sb, __func__,
611 "Couldn't clean up the journal");
612 }
613
614 ext4_release_system_zone(sb);
615 ext4_mb_release(sb);
616 ext4_ext_release(sb);
617 ext4_xattr_put_super(sb);
618
619 if (!(sb->s_flags & MS_RDONLY)) {
620 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
621 es->s_state = cpu_to_le16(sbi->s_mount_state);
622 ext4_commit_super(sb, 1);
623 }
624 if (sbi->s_proc) {
625 remove_proc_entry(sb->s_id, ext4_proc_root);
626 }
627 kobject_del(&sbi->s_kobj);
628
629 for (i = 0; i < sbi->s_gdb_count; i++)
630 brelse(sbi->s_group_desc[i]);
631 kfree(sbi->s_group_desc);
632 if (is_vmalloc_addr(sbi->s_flex_groups))
633 vfree(sbi->s_flex_groups);
634 else
635 kfree(sbi->s_flex_groups);
636 percpu_counter_destroy(&sbi->s_freeblocks_counter);
637 percpu_counter_destroy(&sbi->s_freeinodes_counter);
638 percpu_counter_destroy(&sbi->s_dirs_counter);
639 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
640 brelse(sbi->s_sbh);
641 #ifdef CONFIG_QUOTA
642 for (i = 0; i < MAXQUOTAS; i++)
643 kfree(sbi->s_qf_names[i]);
644 #endif
645
646 /* Debugging code just in case the in-memory inode orphan list
647 * isn't empty. The on-disk one can be non-empty if we've
648 * detected an error and taken the fs readonly, but the
649 * in-memory list had better be clean by this point. */
650 if (!list_empty(&sbi->s_orphan))
651 dump_orphan_list(sb, sbi);
652 J_ASSERT(list_empty(&sbi->s_orphan));
653
654 invalidate_bdev(sb->s_bdev);
655 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
656 /*
657 * Invalidate the journal device's buffers. We don't want them
658 * floating about in memory - the physical journal device may
659 * hotswapped, and it breaks the `ro-after' testing code.
660 */
661 sync_blockdev(sbi->journal_bdev);
662 invalidate_bdev(sbi->journal_bdev);
663 ext4_blkdev_remove(sbi);
664 }
665 sb->s_fs_info = NULL;
666 /*
667 * Now that we are completely done shutting down the
668 * superblock, we need to actually destroy the kobject.
669 */
670 unlock_kernel();
671 unlock_super(sb);
672 kobject_put(&sbi->s_kobj);
673 wait_for_completion(&sbi->s_kobj_unregister);
674 kfree(sbi->s_blockgroup_lock);
675 kfree(sbi);
676 }
677
678 static struct kmem_cache *ext4_inode_cachep;
679
680 /*
681 * Called inside transaction, so use GFP_NOFS
682 */
683 static struct inode *ext4_alloc_inode(struct super_block *sb)
684 {
685 struct ext4_inode_info *ei;
686
687 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
688 if (!ei)
689 return NULL;
690
691 ei->vfs_inode.i_version = 1;
692 ei->vfs_inode.i_data.writeback_index = 0;
693 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
694 INIT_LIST_HEAD(&ei->i_prealloc_list);
695 spin_lock_init(&ei->i_prealloc_lock);
696 /*
697 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
698 * therefore it can be null here. Don't check it, just initialize
699 * jinode.
700 */
701 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
702 ei->i_reserved_data_blocks = 0;
703 ei->i_reserved_meta_blocks = 0;
704 ei->i_allocated_meta_blocks = 0;
705 ei->i_da_metadata_calc_len = 0;
706 ei->i_delalloc_reserved_flag = 0;
707 spin_lock_init(&(ei->i_block_reservation_lock));
708 #ifdef CONFIG_QUOTA
709 ei->i_reserved_quota = 0;
710 #endif
711 INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
712 ei->cur_aio_dio = NULL;
713 ei->i_sync_tid = 0;
714 ei->i_datasync_tid = 0;
715
716 return &ei->vfs_inode;
717 }
718
719 static void ext4_destroy_inode(struct inode *inode)
720 {
721 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
722 ext4_msg(inode->i_sb, KERN_ERR,
723 "Inode %lu (%p): orphan list check failed!",
724 inode->i_ino, EXT4_I(inode));
725 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
726 EXT4_I(inode), sizeof(struct ext4_inode_info),
727 true);
728 dump_stack();
729 }
730 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
731 }
732
733 static void init_once(void *foo)
734 {
735 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
736
737 INIT_LIST_HEAD(&ei->i_orphan);
738 #ifdef CONFIG_EXT4_FS_XATTR
739 init_rwsem(&ei->xattr_sem);
740 #endif
741 init_rwsem(&ei->i_data_sem);
742 inode_init_once(&ei->vfs_inode);
743 }
744
745 static int init_inodecache(void)
746 {
747 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
748 sizeof(struct ext4_inode_info),
749 0, (SLAB_RECLAIM_ACCOUNT|
750 SLAB_MEM_SPREAD),
751 init_once);
752 if (ext4_inode_cachep == NULL)
753 return -ENOMEM;
754 return 0;
755 }
756
757 static void destroy_inodecache(void)
758 {
759 kmem_cache_destroy(ext4_inode_cachep);
760 }
761
762 static void ext4_clear_inode(struct inode *inode)
763 {
764 ext4_discard_preallocations(inode);
765 if (EXT4_JOURNAL(inode))
766 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
767 &EXT4_I(inode)->jinode);
768 }
769
770 static inline void ext4_show_quota_options(struct seq_file *seq,
771 struct super_block *sb)
772 {
773 #if defined(CONFIG_QUOTA)
774 struct ext4_sb_info *sbi = EXT4_SB(sb);
775
776 if (sbi->s_jquota_fmt) {
777 char *fmtname = "";
778
779 switch (sbi->s_jquota_fmt) {
780 case QFMT_VFS_OLD:
781 fmtname = "vfsold";
782 break;
783 case QFMT_VFS_V0:
784 fmtname = "vfsv0";
785 break;
786 case QFMT_VFS_V1:
787 fmtname = "vfsv1";
788 break;
789 }
790 seq_printf(seq, ",jqfmt=%s", fmtname);
791 }
792
793 if (sbi->s_qf_names[USRQUOTA])
794 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
795
796 if (sbi->s_qf_names[GRPQUOTA])
797 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
798
799 if (test_opt(sb, USRQUOTA))
800 seq_puts(seq, ",usrquota");
801
802 if (test_opt(sb, GRPQUOTA))
803 seq_puts(seq, ",grpquota");
804 #endif
805 }
806
807 /*
808 * Show an option if
809 * - it's set to a non-default value OR
810 * - if the per-sb default is different from the global default
811 */
812 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
813 {
814 int def_errors;
815 unsigned long def_mount_opts;
816 struct super_block *sb = vfs->mnt_sb;
817 struct ext4_sb_info *sbi = EXT4_SB(sb);
818 struct ext4_super_block *es = sbi->s_es;
819
820 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
821 def_errors = le16_to_cpu(es->s_errors);
822
823 if (sbi->s_sb_block != 1)
824 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
825 if (test_opt(sb, MINIX_DF))
826 seq_puts(seq, ",minixdf");
827 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
828 seq_puts(seq, ",grpid");
829 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
830 seq_puts(seq, ",nogrpid");
831 if (sbi->s_resuid != EXT4_DEF_RESUID ||
832 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
833 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
834 }
835 if (sbi->s_resgid != EXT4_DEF_RESGID ||
836 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
837 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
838 }
839 if (test_opt(sb, ERRORS_RO)) {
840 if (def_errors == EXT4_ERRORS_PANIC ||
841 def_errors == EXT4_ERRORS_CONTINUE) {
842 seq_puts(seq, ",errors=remount-ro");
843 }
844 }
845 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
846 seq_puts(seq, ",errors=continue");
847 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
848 seq_puts(seq, ",errors=panic");
849 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
850 seq_puts(seq, ",nouid32");
851 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
852 seq_puts(seq, ",debug");
853 if (test_opt(sb, OLDALLOC))
854 seq_puts(seq, ",oldalloc");
855 #ifdef CONFIG_EXT4_FS_XATTR
856 if (test_opt(sb, XATTR_USER) &&
857 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
858 seq_puts(seq, ",user_xattr");
859 if (!test_opt(sb, XATTR_USER) &&
860 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
861 seq_puts(seq, ",nouser_xattr");
862 }
863 #endif
864 #ifdef CONFIG_EXT4_FS_POSIX_ACL
865 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
866 seq_puts(seq, ",acl");
867 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
868 seq_puts(seq, ",noacl");
869 #endif
870 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
871 seq_printf(seq, ",commit=%u",
872 (unsigned) (sbi->s_commit_interval / HZ));
873 }
874 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
875 seq_printf(seq, ",min_batch_time=%u",
876 (unsigned) sbi->s_min_batch_time);
877 }
878 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
879 seq_printf(seq, ",max_batch_time=%u",
880 (unsigned) sbi->s_min_batch_time);
881 }
882
883 /*
884 * We're changing the default of barrier mount option, so
885 * let's always display its mount state so it's clear what its
886 * status is.
887 */
888 seq_puts(seq, ",barrier=");
889 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
890 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
891 seq_puts(seq, ",journal_async_commit");
892 if (test_opt(sb, NOBH))
893 seq_puts(seq, ",nobh");
894 if (test_opt(sb, I_VERSION))
895 seq_puts(seq, ",i_version");
896 if (!test_opt(sb, DELALLOC))
897 seq_puts(seq, ",nodelalloc");
898
899
900 if (sbi->s_stripe)
901 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
902 /*
903 * journal mode get enabled in different ways
904 * So just print the value even if we didn't specify it
905 */
906 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
907 seq_puts(seq, ",data=journal");
908 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
909 seq_puts(seq, ",data=ordered");
910 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
911 seq_puts(seq, ",data=writeback");
912
913 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
914 seq_printf(seq, ",inode_readahead_blks=%u",
915 sbi->s_inode_readahead_blks);
916
917 if (test_opt(sb, DATA_ERR_ABORT))
918 seq_puts(seq, ",data_err=abort");
919
920 if (test_opt(sb, NO_AUTO_DA_ALLOC))
921 seq_puts(seq, ",noauto_da_alloc");
922
923 if (test_opt(sb, DISCARD))
924 seq_puts(seq, ",discard");
925
926 if (test_opt(sb, NOLOAD))
927 seq_puts(seq, ",norecovery");
928
929 ext4_show_quota_options(seq, sb);
930
931 return 0;
932 }
933
934 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
935 u64 ino, u32 generation)
936 {
937 struct inode *inode;
938
939 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
940 return ERR_PTR(-ESTALE);
941 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
942 return ERR_PTR(-ESTALE);
943
944 /* iget isn't really right if the inode is currently unallocated!!
945 *
946 * ext4_read_inode will return a bad_inode if the inode had been
947 * deleted, so we should be safe.
948 *
949 * Currently we don't know the generation for parent directory, so
950 * a generation of 0 means "accept any"
951 */
952 inode = ext4_iget(sb, ino);
953 if (IS_ERR(inode))
954 return ERR_CAST(inode);
955 if (generation && inode->i_generation != generation) {
956 iput(inode);
957 return ERR_PTR(-ESTALE);
958 }
959
960 return inode;
961 }
962
963 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
964 int fh_len, int fh_type)
965 {
966 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
967 ext4_nfs_get_inode);
968 }
969
970 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
971 int fh_len, int fh_type)
972 {
973 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
974 ext4_nfs_get_inode);
975 }
976
977 /*
978 * Try to release metadata pages (indirect blocks, directories) which are
979 * mapped via the block device. Since these pages could have journal heads
980 * which would prevent try_to_free_buffers() from freeing them, we must use
981 * jbd2 layer's try_to_free_buffers() function to release them.
982 */
983 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
984 gfp_t wait)
985 {
986 journal_t *journal = EXT4_SB(sb)->s_journal;
987
988 WARN_ON(PageChecked(page));
989 if (!page_has_buffers(page))
990 return 0;
991 if (journal)
992 return jbd2_journal_try_to_free_buffers(journal, page,
993 wait & ~__GFP_WAIT);
994 return try_to_free_buffers(page);
995 }
996
997 #ifdef CONFIG_QUOTA
998 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
999 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1000
1001 static int ext4_write_dquot(struct dquot *dquot);
1002 static int ext4_acquire_dquot(struct dquot *dquot);
1003 static int ext4_release_dquot(struct dquot *dquot);
1004 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1005 static int ext4_write_info(struct super_block *sb, int type);
1006 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1007 char *path, int remount);
1008 static int ext4_quota_on_mount(struct super_block *sb, int type);
1009 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1010 size_t len, loff_t off);
1011 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1012 const char *data, size_t len, loff_t off);
1013
1014 static const struct dquot_operations ext4_quota_operations = {
1015 .initialize = dquot_initialize,
1016 .drop = dquot_drop,
1017 .alloc_space = dquot_alloc_space,
1018 .reserve_space = dquot_reserve_space,
1019 .claim_space = dquot_claim_space,
1020 .release_rsv = dquot_release_reserved_space,
1021 #ifdef CONFIG_QUOTA
1022 .get_reserved_space = ext4_get_reserved_space,
1023 #endif
1024 .alloc_inode = dquot_alloc_inode,
1025 .free_space = dquot_free_space,
1026 .free_inode = dquot_free_inode,
1027 .transfer = dquot_transfer,
1028 .write_dquot = ext4_write_dquot,
1029 .acquire_dquot = ext4_acquire_dquot,
1030 .release_dquot = ext4_release_dquot,
1031 .mark_dirty = ext4_mark_dquot_dirty,
1032 .write_info = ext4_write_info,
1033 .alloc_dquot = dquot_alloc,
1034 .destroy_dquot = dquot_destroy,
1035 };
1036
1037 static const struct quotactl_ops ext4_qctl_operations = {
1038 .quota_on = ext4_quota_on,
1039 .quota_off = vfs_quota_off,
1040 .quota_sync = vfs_quota_sync,
1041 .get_info = vfs_get_dqinfo,
1042 .set_info = vfs_set_dqinfo,
1043 .get_dqblk = vfs_get_dqblk,
1044 .set_dqblk = vfs_set_dqblk
1045 };
1046 #endif
1047
1048 static const struct super_operations ext4_sops = {
1049 .alloc_inode = ext4_alloc_inode,
1050 .destroy_inode = ext4_destroy_inode,
1051 .write_inode = ext4_write_inode,
1052 .dirty_inode = ext4_dirty_inode,
1053 .delete_inode = ext4_delete_inode,
1054 .put_super = ext4_put_super,
1055 .sync_fs = ext4_sync_fs,
1056 .freeze_fs = ext4_freeze,
1057 .unfreeze_fs = ext4_unfreeze,
1058 .statfs = ext4_statfs,
1059 .remount_fs = ext4_remount,
1060 .clear_inode = ext4_clear_inode,
1061 .show_options = ext4_show_options,
1062 #ifdef CONFIG_QUOTA
1063 .quota_read = ext4_quota_read,
1064 .quota_write = ext4_quota_write,
1065 #endif
1066 .bdev_try_to_free_page = bdev_try_to_free_page,
1067 };
1068
1069 static const struct super_operations ext4_nojournal_sops = {
1070 .alloc_inode = ext4_alloc_inode,
1071 .destroy_inode = ext4_destroy_inode,
1072 .write_inode = ext4_write_inode,
1073 .dirty_inode = ext4_dirty_inode,
1074 .delete_inode = ext4_delete_inode,
1075 .write_super = ext4_write_super,
1076 .put_super = ext4_put_super,
1077 .statfs = ext4_statfs,
1078 .remount_fs = ext4_remount,
1079 .clear_inode = ext4_clear_inode,
1080 .show_options = ext4_show_options,
1081 #ifdef CONFIG_QUOTA
1082 .quota_read = ext4_quota_read,
1083 .quota_write = ext4_quota_write,
1084 #endif
1085 .bdev_try_to_free_page = bdev_try_to_free_page,
1086 };
1087
1088 static const struct export_operations ext4_export_ops = {
1089 .fh_to_dentry = ext4_fh_to_dentry,
1090 .fh_to_parent = ext4_fh_to_parent,
1091 .get_parent = ext4_get_parent,
1092 };
1093
1094 enum {
1095 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1096 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1097 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1098 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1099 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1100 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1101 Opt_journal_update, Opt_journal_dev,
1102 Opt_journal_checksum, Opt_journal_async_commit,
1103 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1104 Opt_data_err_abort, Opt_data_err_ignore,
1105 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1106 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1107 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1108 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1109 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1110 Opt_block_validity, Opt_noblock_validity,
1111 Opt_inode_readahead_blks, Opt_journal_ioprio,
1112 Opt_discard, Opt_nodiscard,
1113 };
1114
1115 static const match_table_t tokens = {
1116 {Opt_bsd_df, "bsddf"},
1117 {Opt_minix_df, "minixdf"},
1118 {Opt_grpid, "grpid"},
1119 {Opt_grpid, "bsdgroups"},
1120 {Opt_nogrpid, "nogrpid"},
1121 {Opt_nogrpid, "sysvgroups"},
1122 {Opt_resgid, "resgid=%u"},
1123 {Opt_resuid, "resuid=%u"},
1124 {Opt_sb, "sb=%u"},
1125 {Opt_err_cont, "errors=continue"},
1126 {Opt_err_panic, "errors=panic"},
1127 {Opt_err_ro, "errors=remount-ro"},
1128 {Opt_nouid32, "nouid32"},
1129 {Opt_debug, "debug"},
1130 {Opt_oldalloc, "oldalloc"},
1131 {Opt_orlov, "orlov"},
1132 {Opt_user_xattr, "user_xattr"},
1133 {Opt_nouser_xattr, "nouser_xattr"},
1134 {Opt_acl, "acl"},
1135 {Opt_noacl, "noacl"},
1136 {Opt_noload, "noload"},
1137 {Opt_noload, "norecovery"},
1138 {Opt_nobh, "nobh"},
1139 {Opt_bh, "bh"},
1140 {Opt_commit, "commit=%u"},
1141 {Opt_min_batch_time, "min_batch_time=%u"},
1142 {Opt_max_batch_time, "max_batch_time=%u"},
1143 {Opt_journal_update, "journal=update"},
1144 {Opt_journal_dev, "journal_dev=%u"},
1145 {Opt_journal_checksum, "journal_checksum"},
1146 {Opt_journal_async_commit, "journal_async_commit"},
1147 {Opt_abort, "abort"},
1148 {Opt_data_journal, "data=journal"},
1149 {Opt_data_ordered, "data=ordered"},
1150 {Opt_data_writeback, "data=writeback"},
1151 {Opt_data_err_abort, "data_err=abort"},
1152 {Opt_data_err_ignore, "data_err=ignore"},
1153 {Opt_offusrjquota, "usrjquota="},
1154 {Opt_usrjquota, "usrjquota=%s"},
1155 {Opt_offgrpjquota, "grpjquota="},
1156 {Opt_grpjquota, "grpjquota=%s"},
1157 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1158 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1159 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1160 {Opt_grpquota, "grpquota"},
1161 {Opt_noquota, "noquota"},
1162 {Opt_quota, "quota"},
1163 {Opt_usrquota, "usrquota"},
1164 {Opt_barrier, "barrier=%u"},
1165 {Opt_barrier, "barrier"},
1166 {Opt_nobarrier, "nobarrier"},
1167 {Opt_i_version, "i_version"},
1168 {Opt_stripe, "stripe=%u"},
1169 {Opt_resize, "resize"},
1170 {Opt_delalloc, "delalloc"},
1171 {Opt_nodelalloc, "nodelalloc"},
1172 {Opt_block_validity, "block_validity"},
1173 {Opt_noblock_validity, "noblock_validity"},
1174 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1175 {Opt_journal_ioprio, "journal_ioprio=%u"},
1176 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1177 {Opt_auto_da_alloc, "auto_da_alloc"},
1178 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1179 {Opt_discard, "discard"},
1180 {Opt_nodiscard, "nodiscard"},
1181 {Opt_err, NULL},
1182 };
1183
1184 static ext4_fsblk_t get_sb_block(void **data)
1185 {
1186 ext4_fsblk_t sb_block;
1187 char *options = (char *) *data;
1188
1189 if (!options || strncmp(options, "sb=", 3) != 0)
1190 return 1; /* Default location */
1191
1192 options += 3;
1193 /* TODO: use simple_strtoll with >32bit ext4 */
1194 sb_block = simple_strtoul(options, &options, 0);
1195 if (*options && *options != ',') {
1196 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1197 (char *) *data);
1198 return 1;
1199 }
1200 if (*options == ',')
1201 options++;
1202 *data = (void *) options;
1203
1204 return sb_block;
1205 }
1206
1207 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1208 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1209 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1210
1211 #ifdef CONFIG_QUOTA
1212 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1213 {
1214 struct ext4_sb_info *sbi = EXT4_SB(sb);
1215 char *qname;
1216
1217 if (sb_any_quota_loaded(sb) &&
1218 !sbi->s_qf_names[qtype]) {
1219 ext4_msg(sb, KERN_ERR,
1220 "Cannot change journaled "
1221 "quota options when quota turned on");
1222 return 0;
1223 }
1224 qname = match_strdup(args);
1225 if (!qname) {
1226 ext4_msg(sb, KERN_ERR,
1227 "Not enough memory for storing quotafile name");
1228 return 0;
1229 }
1230 if (sbi->s_qf_names[qtype] &&
1231 strcmp(sbi->s_qf_names[qtype], qname)) {
1232 ext4_msg(sb, KERN_ERR,
1233 "%s quota file already specified", QTYPE2NAME(qtype));
1234 kfree(qname);
1235 return 0;
1236 }
1237 sbi->s_qf_names[qtype] = qname;
1238 if (strchr(sbi->s_qf_names[qtype], '/')) {
1239 ext4_msg(sb, KERN_ERR,
1240 "quotafile must be on filesystem root");
1241 kfree(sbi->s_qf_names[qtype]);
1242 sbi->s_qf_names[qtype] = NULL;
1243 return 0;
1244 }
1245 set_opt(sbi->s_mount_opt, QUOTA);
1246 return 1;
1247 }
1248
1249 static int clear_qf_name(struct super_block *sb, int qtype)
1250 {
1251
1252 struct ext4_sb_info *sbi = EXT4_SB(sb);
1253
1254 if (sb_any_quota_loaded(sb) &&
1255 sbi->s_qf_names[qtype]) {
1256 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1257 " when quota turned on");
1258 return 0;
1259 }
1260 /*
1261 * The space will be released later when all options are confirmed
1262 * to be correct
1263 */
1264 sbi->s_qf_names[qtype] = NULL;
1265 return 1;
1266 }
1267 #endif
1268
1269 static int parse_options(char *options, struct super_block *sb,
1270 unsigned long *journal_devnum,
1271 unsigned int *journal_ioprio,
1272 ext4_fsblk_t *n_blocks_count, int is_remount)
1273 {
1274 struct ext4_sb_info *sbi = EXT4_SB(sb);
1275 char *p;
1276 substring_t args[MAX_OPT_ARGS];
1277 int data_opt = 0;
1278 int option;
1279 #ifdef CONFIG_QUOTA
1280 int qfmt;
1281 #endif
1282
1283 if (!options)
1284 return 1;
1285
1286 while ((p = strsep(&options, ",")) != NULL) {
1287 int token;
1288 if (!*p)
1289 continue;
1290
1291 /*
1292 * Initialize args struct so we know whether arg was
1293 * found; some options take optional arguments.
1294 */
1295 args[0].to = args[0].from = 0;
1296 token = match_token(p, tokens, args);
1297 switch (token) {
1298 case Opt_bsd_df:
1299 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1300 clear_opt(sbi->s_mount_opt, MINIX_DF);
1301 break;
1302 case Opt_minix_df:
1303 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1304 set_opt(sbi->s_mount_opt, MINIX_DF);
1305
1306 break;
1307 case Opt_grpid:
1308 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1309 set_opt(sbi->s_mount_opt, GRPID);
1310
1311 break;
1312 case Opt_nogrpid:
1313 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1314 clear_opt(sbi->s_mount_opt, GRPID);
1315
1316 break;
1317 case Opt_resuid:
1318 if (match_int(&args[0], &option))
1319 return 0;
1320 sbi->s_resuid = option;
1321 break;
1322 case Opt_resgid:
1323 if (match_int(&args[0], &option))
1324 return 0;
1325 sbi->s_resgid = option;
1326 break;
1327 case Opt_sb:
1328 /* handled by get_sb_block() instead of here */
1329 /* *sb_block = match_int(&args[0]); */
1330 break;
1331 case Opt_err_panic:
1332 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1333 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1334 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1335 break;
1336 case Opt_err_ro:
1337 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1338 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1339 set_opt(sbi->s_mount_opt, ERRORS_RO);
1340 break;
1341 case Opt_err_cont:
1342 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1343 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1344 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1345 break;
1346 case Opt_nouid32:
1347 set_opt(sbi->s_mount_opt, NO_UID32);
1348 break;
1349 case Opt_debug:
1350 set_opt(sbi->s_mount_opt, DEBUG);
1351 break;
1352 case Opt_oldalloc:
1353 set_opt(sbi->s_mount_opt, OLDALLOC);
1354 break;
1355 case Opt_orlov:
1356 clear_opt(sbi->s_mount_opt, OLDALLOC);
1357 break;
1358 #ifdef CONFIG_EXT4_FS_XATTR
1359 case Opt_user_xattr:
1360 set_opt(sbi->s_mount_opt, XATTR_USER);
1361 break;
1362 case Opt_nouser_xattr:
1363 clear_opt(sbi->s_mount_opt, XATTR_USER);
1364 break;
1365 #else
1366 case Opt_user_xattr:
1367 case Opt_nouser_xattr:
1368 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1369 break;
1370 #endif
1371 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1372 case Opt_acl:
1373 set_opt(sbi->s_mount_opt, POSIX_ACL);
1374 break;
1375 case Opt_noacl:
1376 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1377 break;
1378 #else
1379 case Opt_acl:
1380 case Opt_noacl:
1381 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1382 break;
1383 #endif
1384 case Opt_journal_update:
1385 /* @@@ FIXME */
1386 /* Eventually we will want to be able to create
1387 a journal file here. For now, only allow the
1388 user to specify an existing inode to be the
1389 journal file. */
1390 if (is_remount) {
1391 ext4_msg(sb, KERN_ERR,
1392 "Cannot specify journal on remount");
1393 return 0;
1394 }
1395 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1396 break;
1397 case Opt_journal_dev:
1398 if (is_remount) {
1399 ext4_msg(sb, KERN_ERR,
1400 "Cannot specify journal on remount");
1401 return 0;
1402 }
1403 if (match_int(&args[0], &option))
1404 return 0;
1405 *journal_devnum = option;
1406 break;
1407 case Opt_journal_checksum:
1408 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1409 break;
1410 case Opt_journal_async_commit:
1411 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1412 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1413 break;
1414 case Opt_noload:
1415 set_opt(sbi->s_mount_opt, NOLOAD);
1416 break;
1417 case Opt_commit:
1418 if (match_int(&args[0], &option))
1419 return 0;
1420 if (option < 0)
1421 return 0;
1422 if (option == 0)
1423 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1424 sbi->s_commit_interval = HZ * option;
1425 break;
1426 case Opt_max_batch_time:
1427 if (match_int(&args[0], &option))
1428 return 0;
1429 if (option < 0)
1430 return 0;
1431 if (option == 0)
1432 option = EXT4_DEF_MAX_BATCH_TIME;
1433 sbi->s_max_batch_time = option;
1434 break;
1435 case Opt_min_batch_time:
1436 if (match_int(&args[0], &option))
1437 return 0;
1438 if (option < 0)
1439 return 0;
1440 sbi->s_min_batch_time = option;
1441 break;
1442 case Opt_data_journal:
1443 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1444 goto datacheck;
1445 case Opt_data_ordered:
1446 data_opt = EXT4_MOUNT_ORDERED_DATA;
1447 goto datacheck;
1448 case Opt_data_writeback:
1449 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1450 datacheck:
1451 if (is_remount) {
1452 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1453 ext4_msg(sb, KERN_ERR,
1454 "Cannot change data mode on remount");
1455 return 0;
1456 }
1457 } else {
1458 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1459 sbi->s_mount_opt |= data_opt;
1460 }
1461 break;
1462 case Opt_data_err_abort:
1463 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1464 break;
1465 case Opt_data_err_ignore:
1466 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1467 break;
1468 #ifdef CONFIG_QUOTA
1469 case Opt_usrjquota:
1470 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1471 return 0;
1472 break;
1473 case Opt_grpjquota:
1474 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1475 return 0;
1476 break;
1477 case Opt_offusrjquota:
1478 if (!clear_qf_name(sb, USRQUOTA))
1479 return 0;
1480 break;
1481 case Opt_offgrpjquota:
1482 if (!clear_qf_name(sb, GRPQUOTA))
1483 return 0;
1484 break;
1485
1486 case Opt_jqfmt_vfsold:
1487 qfmt = QFMT_VFS_OLD;
1488 goto set_qf_format;
1489 case Opt_jqfmt_vfsv0:
1490 qfmt = QFMT_VFS_V0;
1491 goto set_qf_format;
1492 case Opt_jqfmt_vfsv1:
1493 qfmt = QFMT_VFS_V1;
1494 set_qf_format:
1495 if (sb_any_quota_loaded(sb) &&
1496 sbi->s_jquota_fmt != qfmt) {
1497 ext4_msg(sb, KERN_ERR, "Cannot change "
1498 "journaled quota options when "
1499 "quota turned on");
1500 return 0;
1501 }
1502 sbi->s_jquota_fmt = qfmt;
1503 break;
1504 case Opt_quota:
1505 case Opt_usrquota:
1506 set_opt(sbi->s_mount_opt, QUOTA);
1507 set_opt(sbi->s_mount_opt, USRQUOTA);
1508 break;
1509 case Opt_grpquota:
1510 set_opt(sbi->s_mount_opt, QUOTA);
1511 set_opt(sbi->s_mount_opt, GRPQUOTA);
1512 break;
1513 case Opt_noquota:
1514 if (sb_any_quota_loaded(sb)) {
1515 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1516 "options when quota turned on");
1517 return 0;
1518 }
1519 clear_opt(sbi->s_mount_opt, QUOTA);
1520 clear_opt(sbi->s_mount_opt, USRQUOTA);
1521 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1522 break;
1523 #else
1524 case Opt_quota:
1525 case Opt_usrquota:
1526 case Opt_grpquota:
1527 ext4_msg(sb, KERN_ERR,
1528 "quota options not supported");
1529 break;
1530 case Opt_usrjquota:
1531 case Opt_grpjquota:
1532 case Opt_offusrjquota:
1533 case Opt_offgrpjquota:
1534 case Opt_jqfmt_vfsold:
1535 case Opt_jqfmt_vfsv0:
1536 case Opt_jqfmt_vfsv1:
1537 ext4_msg(sb, KERN_ERR,
1538 "journaled quota options not supported");
1539 break;
1540 case Opt_noquota:
1541 break;
1542 #endif
1543 case Opt_abort:
1544 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1545 break;
1546 case Opt_nobarrier:
1547 clear_opt(sbi->s_mount_opt, BARRIER);
1548 break;
1549 case Opt_barrier:
1550 if (args[0].from) {
1551 if (match_int(&args[0], &option))
1552 return 0;
1553 } else
1554 option = 1; /* No argument, default to 1 */
1555 if (option)
1556 set_opt(sbi->s_mount_opt, BARRIER);
1557 else
1558 clear_opt(sbi->s_mount_opt, BARRIER);
1559 break;
1560 case Opt_ignore:
1561 break;
1562 case Opt_resize:
1563 if (!is_remount) {
1564 ext4_msg(sb, KERN_ERR,
1565 "resize option only available "
1566 "for remount");
1567 return 0;
1568 }
1569 if (match_int(&args[0], &option) != 0)
1570 return 0;
1571 *n_blocks_count = option;
1572 break;
1573 case Opt_nobh:
1574 set_opt(sbi->s_mount_opt, NOBH);
1575 break;
1576 case Opt_bh:
1577 clear_opt(sbi->s_mount_opt, NOBH);
1578 break;
1579 case Opt_i_version:
1580 set_opt(sbi->s_mount_opt, I_VERSION);
1581 sb->s_flags |= MS_I_VERSION;
1582 break;
1583 case Opt_nodelalloc:
1584 clear_opt(sbi->s_mount_opt, DELALLOC);
1585 break;
1586 case Opt_stripe:
1587 if (match_int(&args[0], &option))
1588 return 0;
1589 if (option < 0)
1590 return 0;
1591 sbi->s_stripe = option;
1592 break;
1593 case Opt_delalloc:
1594 set_opt(sbi->s_mount_opt, DELALLOC);
1595 break;
1596 case Opt_block_validity:
1597 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1598 break;
1599 case Opt_noblock_validity:
1600 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1601 break;
1602 case Opt_inode_readahead_blks:
1603 if (match_int(&args[0], &option))
1604 return 0;
1605 if (option < 0 || option > (1 << 30))
1606 return 0;
1607 if (!is_power_of_2(option)) {
1608 ext4_msg(sb, KERN_ERR,
1609 "EXT4-fs: inode_readahead_blks"
1610 " must be a power of 2");
1611 return 0;
1612 }
1613 sbi->s_inode_readahead_blks = option;
1614 break;
1615 case Opt_journal_ioprio:
1616 if (match_int(&args[0], &option))
1617 return 0;
1618 if (option < 0 || option > 7)
1619 break;
1620 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1621 option);
1622 break;
1623 case Opt_noauto_da_alloc:
1624 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1625 break;
1626 case Opt_auto_da_alloc:
1627 if (args[0].from) {
1628 if (match_int(&args[0], &option))
1629 return 0;
1630 } else
1631 option = 1; /* No argument, default to 1 */
1632 if (option)
1633 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1634 else
1635 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1636 break;
1637 case Opt_discard:
1638 set_opt(sbi->s_mount_opt, DISCARD);
1639 break;
1640 case Opt_nodiscard:
1641 clear_opt(sbi->s_mount_opt, DISCARD);
1642 break;
1643 default:
1644 ext4_msg(sb, KERN_ERR,
1645 "Unrecognized mount option \"%s\" "
1646 "or missing value", p);
1647 return 0;
1648 }
1649 }
1650 #ifdef CONFIG_QUOTA
1651 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1652 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1653 clear_opt(sbi->s_mount_opt, USRQUOTA);
1654
1655 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1656 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1657
1658 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1659 ext4_msg(sb, KERN_ERR, "old and new quota "
1660 "format mixing");
1661 return 0;
1662 }
1663
1664 if (!sbi->s_jquota_fmt) {
1665 ext4_msg(sb, KERN_ERR, "journaled quota format "
1666 "not specified");
1667 return 0;
1668 }
1669 } else {
1670 if (sbi->s_jquota_fmt) {
1671 ext4_msg(sb, KERN_ERR, "journaled quota format "
1672 "specified with no journaling "
1673 "enabled");
1674 return 0;
1675 }
1676 }
1677 #endif
1678 return 1;
1679 }
1680
1681 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1682 int read_only)
1683 {
1684 struct ext4_sb_info *sbi = EXT4_SB(sb);
1685 int res = 0;
1686
1687 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1688 ext4_msg(sb, KERN_ERR, "revision level too high, "
1689 "forcing read-only mode");
1690 res = MS_RDONLY;
1691 }
1692 if (read_only)
1693 return res;
1694 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1695 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1696 "running e2fsck is recommended");
1697 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1698 ext4_msg(sb, KERN_WARNING,
1699 "warning: mounting fs with errors, "
1700 "running e2fsck is recommended");
1701 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1702 le16_to_cpu(es->s_mnt_count) >=
1703 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1704 ext4_msg(sb, KERN_WARNING,
1705 "warning: maximal mount count reached, "
1706 "running e2fsck is recommended");
1707 else if (le32_to_cpu(es->s_checkinterval) &&
1708 (le32_to_cpu(es->s_lastcheck) +
1709 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1710 ext4_msg(sb, KERN_WARNING,
1711 "warning: checktime reached, "
1712 "running e2fsck is recommended");
1713 if (!sbi->s_journal)
1714 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1715 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1716 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1717 le16_add_cpu(&es->s_mnt_count, 1);
1718 es->s_mtime = cpu_to_le32(get_seconds());
1719 ext4_update_dynamic_rev(sb);
1720 if (sbi->s_journal)
1721 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1722
1723 ext4_commit_super(sb, 1);
1724 if (test_opt(sb, DEBUG))
1725 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1726 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1727 sb->s_blocksize,
1728 sbi->s_groups_count,
1729 EXT4_BLOCKS_PER_GROUP(sb),
1730 EXT4_INODES_PER_GROUP(sb),
1731 sbi->s_mount_opt);
1732
1733 return res;
1734 }
1735
1736 static int ext4_fill_flex_info(struct super_block *sb)
1737 {
1738 struct ext4_sb_info *sbi = EXT4_SB(sb);
1739 struct ext4_group_desc *gdp = NULL;
1740 ext4_group_t flex_group_count;
1741 ext4_group_t flex_group;
1742 int groups_per_flex = 0;
1743 size_t size;
1744 int i;
1745
1746 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1747 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1748
1749 if (groups_per_flex < 2) {
1750 sbi->s_log_groups_per_flex = 0;
1751 return 1;
1752 }
1753
1754 /* We allocate both existing and potentially added groups */
1755 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1756 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1757 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1758 size = flex_group_count * sizeof(struct flex_groups);
1759 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1760 if (sbi->s_flex_groups == NULL) {
1761 sbi->s_flex_groups = vmalloc(size);
1762 if (sbi->s_flex_groups)
1763 memset(sbi->s_flex_groups, 0, size);
1764 }
1765 if (sbi->s_flex_groups == NULL) {
1766 ext4_msg(sb, KERN_ERR, "not enough memory for "
1767 "%u flex groups", flex_group_count);
1768 goto failed;
1769 }
1770
1771 for (i = 0; i < sbi->s_groups_count; i++) {
1772 gdp = ext4_get_group_desc(sb, i, NULL);
1773
1774 flex_group = ext4_flex_group(sbi, i);
1775 atomic_add(ext4_free_inodes_count(sb, gdp),
1776 &sbi->s_flex_groups[flex_group].free_inodes);
1777 atomic_add(ext4_free_blks_count(sb, gdp),
1778 &sbi->s_flex_groups[flex_group].free_blocks);
1779 atomic_add(ext4_used_dirs_count(sb, gdp),
1780 &sbi->s_flex_groups[flex_group].used_dirs);
1781 }
1782
1783 return 1;
1784 failed:
1785 return 0;
1786 }
1787
1788 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1789 struct ext4_group_desc *gdp)
1790 {
1791 __u16 crc = 0;
1792
1793 if (sbi->s_es->s_feature_ro_compat &
1794 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1795 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1796 __le32 le_group = cpu_to_le32(block_group);
1797
1798 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1799 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1800 crc = crc16(crc, (__u8 *)gdp, offset);
1801 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1802 /* for checksum of struct ext4_group_desc do the rest...*/
1803 if ((sbi->s_es->s_feature_incompat &
1804 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1805 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1806 crc = crc16(crc, (__u8 *)gdp + offset,
1807 le16_to_cpu(sbi->s_es->s_desc_size) -
1808 offset);
1809 }
1810
1811 return cpu_to_le16(crc);
1812 }
1813
1814 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1815 struct ext4_group_desc *gdp)
1816 {
1817 if ((sbi->s_es->s_feature_ro_compat &
1818 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1819 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1820 return 0;
1821
1822 return 1;
1823 }
1824
1825 /* Called at mount-time, super-block is locked */
1826 static int ext4_check_descriptors(struct super_block *sb)
1827 {
1828 struct ext4_sb_info *sbi = EXT4_SB(sb);
1829 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1830 ext4_fsblk_t last_block;
1831 ext4_fsblk_t block_bitmap;
1832 ext4_fsblk_t inode_bitmap;
1833 ext4_fsblk_t inode_table;
1834 int flexbg_flag = 0;
1835 ext4_group_t i;
1836
1837 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1838 flexbg_flag = 1;
1839
1840 ext4_debug("Checking group descriptors");
1841
1842 for (i = 0; i < sbi->s_groups_count; i++) {
1843 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1844
1845 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1846 last_block = ext4_blocks_count(sbi->s_es) - 1;
1847 else
1848 last_block = first_block +
1849 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1850
1851 block_bitmap = ext4_block_bitmap(sb, gdp);
1852 if (block_bitmap < first_block || block_bitmap > last_block) {
1853 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1854 "Block bitmap for group %u not in group "
1855 "(block %llu)!", i, block_bitmap);
1856 return 0;
1857 }
1858 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1859 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1860 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1861 "Inode bitmap for group %u not in group "
1862 "(block %llu)!", i, inode_bitmap);
1863 return 0;
1864 }
1865 inode_table = ext4_inode_table(sb, gdp);
1866 if (inode_table < first_block ||
1867 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1868 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1869 "Inode table for group %u not in group "
1870 "(block %llu)!", i, inode_table);
1871 return 0;
1872 }
1873 ext4_lock_group(sb, i);
1874 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1875 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1876 "Checksum for group %u failed (%u!=%u)",
1877 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1878 gdp)), le16_to_cpu(gdp->bg_checksum));
1879 if (!(sb->s_flags & MS_RDONLY)) {
1880 ext4_unlock_group(sb, i);
1881 return 0;
1882 }
1883 }
1884 ext4_unlock_group(sb, i);
1885 if (!flexbg_flag)
1886 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1887 }
1888
1889 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1890 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
1891 return 1;
1892 }
1893
1894 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1895 * the superblock) which were deleted from all directories, but held open by
1896 * a process at the time of a crash. We walk the list and try to delete these
1897 * inodes at recovery time (only with a read-write filesystem).
1898 *
1899 * In order to keep the orphan inode chain consistent during traversal (in
1900 * case of crash during recovery), we link each inode into the superblock
1901 * orphan list_head and handle it the same way as an inode deletion during
1902 * normal operation (which journals the operations for us).
1903 *
1904 * We only do an iget() and an iput() on each inode, which is very safe if we
1905 * accidentally point at an in-use or already deleted inode. The worst that
1906 * can happen in this case is that we get a "bit already cleared" message from
1907 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1908 * e2fsck was run on this filesystem, and it must have already done the orphan
1909 * inode cleanup for us, so we can safely abort without any further action.
1910 */
1911 static void ext4_orphan_cleanup(struct super_block *sb,
1912 struct ext4_super_block *es)
1913 {
1914 unsigned int s_flags = sb->s_flags;
1915 int nr_orphans = 0, nr_truncates = 0;
1916 #ifdef CONFIG_QUOTA
1917 int i;
1918 #endif
1919 if (!es->s_last_orphan) {
1920 jbd_debug(4, "no orphan inodes to clean up\n");
1921 return;
1922 }
1923
1924 if (bdev_read_only(sb->s_bdev)) {
1925 ext4_msg(sb, KERN_ERR, "write access "
1926 "unavailable, skipping orphan cleanup");
1927 return;
1928 }
1929
1930 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1931 if (es->s_last_orphan)
1932 jbd_debug(1, "Errors on filesystem, "
1933 "clearing orphan list.\n");
1934 es->s_last_orphan = 0;
1935 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1936 return;
1937 }
1938
1939 if (s_flags & MS_RDONLY) {
1940 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1941 sb->s_flags &= ~MS_RDONLY;
1942 }
1943 #ifdef CONFIG_QUOTA
1944 /* Needed for iput() to work correctly and not trash data */
1945 sb->s_flags |= MS_ACTIVE;
1946 /* Turn on quotas so that they are updated correctly */
1947 for (i = 0; i < MAXQUOTAS; i++) {
1948 if (EXT4_SB(sb)->s_qf_names[i]) {
1949 int ret = ext4_quota_on_mount(sb, i);
1950 if (ret < 0)
1951 ext4_msg(sb, KERN_ERR,
1952 "Cannot turn on journaled "
1953 "quota: error %d", ret);
1954 }
1955 }
1956 #endif
1957
1958 while (es->s_last_orphan) {
1959 struct inode *inode;
1960
1961 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1962 if (IS_ERR(inode)) {
1963 es->s_last_orphan = 0;
1964 break;
1965 }
1966
1967 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1968 vfs_dq_init(inode);
1969 if (inode->i_nlink) {
1970 ext4_msg(sb, KERN_DEBUG,
1971 "%s: truncating inode %lu to %lld bytes",
1972 __func__, inode->i_ino, inode->i_size);
1973 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1974 inode->i_ino, inode->i_size);
1975 ext4_truncate(inode);
1976 nr_truncates++;
1977 } else {
1978 ext4_msg(sb, KERN_DEBUG,
1979 "%s: deleting unreferenced inode %lu",
1980 __func__, inode->i_ino);
1981 jbd_debug(2, "deleting unreferenced inode %lu\n",
1982 inode->i_ino);
1983 nr_orphans++;
1984 }
1985 iput(inode); /* The delete magic happens here! */
1986 }
1987
1988 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1989
1990 if (nr_orphans)
1991 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1992 PLURAL(nr_orphans));
1993 if (nr_truncates)
1994 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1995 PLURAL(nr_truncates));
1996 #ifdef CONFIG_QUOTA
1997 /* Turn quotas off */
1998 for (i = 0; i < MAXQUOTAS; i++) {
1999 if (sb_dqopt(sb)->files[i])
2000 vfs_quota_off(sb, i, 0);
2001 }
2002 #endif
2003 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2004 }
2005
2006 /*
2007 * Maximal extent format file size.
2008 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2009 * extent format containers, within a sector_t, and within i_blocks
2010 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2011 * so that won't be a limiting factor.
2012 *
2013 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2014 */
2015 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2016 {
2017 loff_t res;
2018 loff_t upper_limit = MAX_LFS_FILESIZE;
2019
2020 /* small i_blocks in vfs inode? */
2021 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2022 /*
2023 * CONFIG_LBDAF is not enabled implies the inode
2024 * i_block represent total blocks in 512 bytes
2025 * 32 == size of vfs inode i_blocks * 8
2026 */
2027 upper_limit = (1LL << 32) - 1;
2028
2029 /* total blocks in file system block size */
2030 upper_limit >>= (blkbits - 9);
2031 upper_limit <<= blkbits;
2032 }
2033
2034 /* 32-bit extent-start container, ee_block */
2035 res = 1LL << 32;
2036 res <<= blkbits;
2037 res -= 1;
2038
2039 /* Sanity check against vm- & vfs- imposed limits */
2040 if (res > upper_limit)
2041 res = upper_limit;
2042
2043 return res;
2044 }
2045
2046 /*
2047 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2048 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2049 * We need to be 1 filesystem block less than the 2^48 sector limit.
2050 */
2051 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2052 {
2053 loff_t res = EXT4_NDIR_BLOCKS;
2054 int meta_blocks;
2055 loff_t upper_limit;
2056 /* This is calculated to be the largest file size for a dense, block
2057 * mapped file such that the file's total number of 512-byte sectors,
2058 * including data and all indirect blocks, does not exceed (2^48 - 1).
2059 *
2060 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2061 * number of 512-byte sectors of the file.
2062 */
2063
2064 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2065 /*
2066 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2067 * the inode i_block field represents total file blocks in
2068 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2069 */
2070 upper_limit = (1LL << 32) - 1;
2071
2072 /* total blocks in file system block size */
2073 upper_limit >>= (bits - 9);
2074
2075 } else {
2076 /*
2077 * We use 48 bit ext4_inode i_blocks
2078 * With EXT4_HUGE_FILE_FL set the i_blocks
2079 * represent total number of blocks in
2080 * file system block size
2081 */
2082 upper_limit = (1LL << 48) - 1;
2083
2084 }
2085
2086 /* indirect blocks */
2087 meta_blocks = 1;
2088 /* double indirect blocks */
2089 meta_blocks += 1 + (1LL << (bits-2));
2090 /* tripple indirect blocks */
2091 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2092
2093 upper_limit -= meta_blocks;
2094 upper_limit <<= bits;
2095
2096 res += 1LL << (bits-2);
2097 res += 1LL << (2*(bits-2));
2098 res += 1LL << (3*(bits-2));
2099 res <<= bits;
2100 if (res > upper_limit)
2101 res = upper_limit;
2102
2103 if (res > MAX_LFS_FILESIZE)
2104 res = MAX_LFS_FILESIZE;
2105
2106 return res;
2107 }
2108
2109 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2110 ext4_fsblk_t logical_sb_block, int nr)
2111 {
2112 struct ext4_sb_info *sbi = EXT4_SB(sb);
2113 ext4_group_t bg, first_meta_bg;
2114 int has_super = 0;
2115
2116 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2117
2118 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2119 nr < first_meta_bg)
2120 return logical_sb_block + nr + 1;
2121 bg = sbi->s_desc_per_block * nr;
2122 if (ext4_bg_has_super(sb, bg))
2123 has_super = 1;
2124
2125 return (has_super + ext4_group_first_block_no(sb, bg));
2126 }
2127
2128 /**
2129 * ext4_get_stripe_size: Get the stripe size.
2130 * @sbi: In memory super block info
2131 *
2132 * If we have specified it via mount option, then
2133 * use the mount option value. If the value specified at mount time is
2134 * greater than the blocks per group use the super block value.
2135 * If the super block value is greater than blocks per group return 0.
2136 * Allocator needs it be less than blocks per group.
2137 *
2138 */
2139 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2140 {
2141 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2142 unsigned long stripe_width =
2143 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2144
2145 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2146 return sbi->s_stripe;
2147
2148 if (stripe_width <= sbi->s_blocks_per_group)
2149 return stripe_width;
2150
2151 if (stride <= sbi->s_blocks_per_group)
2152 return stride;
2153
2154 return 0;
2155 }
2156
2157 /* sysfs supprt */
2158
2159 struct ext4_attr {
2160 struct attribute attr;
2161 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2162 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2163 const char *, size_t);
2164 int offset;
2165 };
2166
2167 static int parse_strtoul(const char *buf,
2168 unsigned long max, unsigned long *value)
2169 {
2170 char *endp;
2171
2172 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2173 endp = skip_spaces(endp);
2174 if (*endp || *value > max)
2175 return -EINVAL;
2176
2177 return 0;
2178 }
2179
2180 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2181 struct ext4_sb_info *sbi,
2182 char *buf)
2183 {
2184 return snprintf(buf, PAGE_SIZE, "%llu\n",
2185 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2186 }
2187
2188 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2189 struct ext4_sb_info *sbi, char *buf)
2190 {
2191 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2192
2193 return snprintf(buf, PAGE_SIZE, "%lu\n",
2194 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2195 sbi->s_sectors_written_start) >> 1);
2196 }
2197
2198 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2199 struct ext4_sb_info *sbi, char *buf)
2200 {
2201 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2202
2203 return snprintf(buf, PAGE_SIZE, "%llu\n",
2204 (unsigned long long)(sbi->s_kbytes_written +
2205 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2206 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2207 }
2208
2209 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2210 struct ext4_sb_info *sbi,
2211 const char *buf, size_t count)
2212 {
2213 unsigned long t;
2214
2215 if (parse_strtoul(buf, 0x40000000, &t))
2216 return -EINVAL;
2217
2218 if (!is_power_of_2(t))
2219 return -EINVAL;
2220
2221 sbi->s_inode_readahead_blks = t;
2222 return count;
2223 }
2224
2225 static ssize_t sbi_ui_show(struct ext4_attr *a,
2226 struct ext4_sb_info *sbi, char *buf)
2227 {
2228 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2229
2230 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2231 }
2232
2233 static ssize_t sbi_ui_store(struct ext4_attr *a,
2234 struct ext4_sb_info *sbi,
2235 const char *buf, size_t count)
2236 {
2237 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2238 unsigned long t;
2239
2240 if (parse_strtoul(buf, 0xffffffff, &t))
2241 return -EINVAL;
2242 *ui = t;
2243 return count;
2244 }
2245
2246 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2247 static struct ext4_attr ext4_attr_##_name = { \
2248 .attr = {.name = __stringify(_name), .mode = _mode }, \
2249 .show = _show, \
2250 .store = _store, \
2251 .offset = offsetof(struct ext4_sb_info, _elname), \
2252 }
2253 #define EXT4_ATTR(name, mode, show, store) \
2254 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2255
2256 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2257 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2258 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2259 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2260 #define ATTR_LIST(name) &ext4_attr_##name.attr
2261
2262 EXT4_RO_ATTR(delayed_allocation_blocks);
2263 EXT4_RO_ATTR(session_write_kbytes);
2264 EXT4_RO_ATTR(lifetime_write_kbytes);
2265 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2266 inode_readahead_blks_store, s_inode_readahead_blks);
2267 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2268 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2269 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2270 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2271 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2272 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2273 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2274 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2275
2276 static struct attribute *ext4_attrs[] = {
2277 ATTR_LIST(delayed_allocation_blocks),
2278 ATTR_LIST(session_write_kbytes),
2279 ATTR_LIST(lifetime_write_kbytes),
2280 ATTR_LIST(inode_readahead_blks),
2281 ATTR_LIST(inode_goal),
2282 ATTR_LIST(mb_stats),
2283 ATTR_LIST(mb_max_to_scan),
2284 ATTR_LIST(mb_min_to_scan),
2285 ATTR_LIST(mb_order2_req),
2286 ATTR_LIST(mb_stream_req),
2287 ATTR_LIST(mb_group_prealloc),
2288 ATTR_LIST(max_writeback_mb_bump),
2289 NULL,
2290 };
2291
2292 static ssize_t ext4_attr_show(struct kobject *kobj,
2293 struct attribute *attr, char *buf)
2294 {
2295 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2296 s_kobj);
2297 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2298
2299 return a->show ? a->show(a, sbi, buf) : 0;
2300 }
2301
2302 static ssize_t ext4_attr_store(struct kobject *kobj,
2303 struct attribute *attr,
2304 const char *buf, size_t len)
2305 {
2306 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2307 s_kobj);
2308 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2309
2310 return a->store ? a->store(a, sbi, buf, len) : 0;
2311 }
2312
2313 static void ext4_sb_release(struct kobject *kobj)
2314 {
2315 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2316 s_kobj);
2317 complete(&sbi->s_kobj_unregister);
2318 }
2319
2320
2321 static struct sysfs_ops ext4_attr_ops = {
2322 .show = ext4_attr_show,
2323 .store = ext4_attr_store,
2324 };
2325
2326 static struct kobj_type ext4_ktype = {
2327 .default_attrs = ext4_attrs,
2328 .sysfs_ops = &ext4_attr_ops,
2329 .release = ext4_sb_release,
2330 };
2331
2332 /*
2333 * Check whether this filesystem can be mounted based on
2334 * the features present and the RDONLY/RDWR mount requested.
2335 * Returns 1 if this filesystem can be mounted as requested,
2336 * 0 if it cannot be.
2337 */
2338 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2339 {
2340 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2341 ext4_msg(sb, KERN_ERR,
2342 "Couldn't mount because of "
2343 "unsupported optional features (%x)",
2344 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2345 ~EXT4_FEATURE_INCOMPAT_SUPP));
2346 return 0;
2347 }
2348
2349 if (readonly)
2350 return 1;
2351
2352 /* Check that feature set is OK for a read-write mount */
2353 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2354 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2355 "unsupported optional features (%x)",
2356 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2357 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2358 return 0;
2359 }
2360 /*
2361 * Large file size enabled file system can only be mounted
2362 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2363 */
2364 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2365 if (sizeof(blkcnt_t) < sizeof(u64)) {
2366 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2367 "cannot be mounted RDWR without "
2368 "CONFIG_LBDAF");
2369 return 0;
2370 }
2371 }
2372 return 1;
2373 }
2374
2375 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2376 __releases(kernel_lock)
2377 __acquires(kernel_lock)
2378 {
2379 struct buffer_head *bh;
2380 struct ext4_super_block *es = NULL;
2381 struct ext4_sb_info *sbi;
2382 ext4_fsblk_t block;
2383 ext4_fsblk_t sb_block = get_sb_block(&data);
2384 ext4_fsblk_t logical_sb_block;
2385 unsigned long offset = 0;
2386 unsigned long journal_devnum = 0;
2387 unsigned long def_mount_opts;
2388 struct inode *root;
2389 char *cp;
2390 const char *descr;
2391 int ret = -EINVAL;
2392 int blocksize;
2393 unsigned int db_count;
2394 unsigned int i;
2395 int needs_recovery, has_huge_files;
2396 __u64 blocks_count;
2397 int err;
2398 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2399
2400 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2401 if (!sbi)
2402 return -ENOMEM;
2403
2404 sbi->s_blockgroup_lock =
2405 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2406 if (!sbi->s_blockgroup_lock) {
2407 kfree(sbi);
2408 return -ENOMEM;
2409 }
2410 sb->s_fs_info = sbi;
2411 sbi->s_mount_opt = 0;
2412 sbi->s_resuid = EXT4_DEF_RESUID;
2413 sbi->s_resgid = EXT4_DEF_RESGID;
2414 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2415 sbi->s_sb_block = sb_block;
2416 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2417 sectors[1]);
2418
2419 unlock_kernel();
2420
2421 /* Cleanup superblock name */
2422 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2423 *cp = '!';
2424
2425 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2426 if (!blocksize) {
2427 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
2428 goto out_fail;
2429 }
2430
2431 /*
2432 * The ext4 superblock will not be buffer aligned for other than 1kB
2433 * block sizes. We need to calculate the offset from buffer start.
2434 */
2435 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2436 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2437 offset = do_div(logical_sb_block, blocksize);
2438 } else {
2439 logical_sb_block = sb_block;
2440 }
2441
2442 if (!(bh = sb_bread(sb, logical_sb_block))) {
2443 ext4_msg(sb, KERN_ERR, "unable to read superblock");
2444 goto out_fail;
2445 }
2446 /*
2447 * Note: s_es must be initialized as soon as possible because
2448 * some ext4 macro-instructions depend on its value
2449 */
2450 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2451 sbi->s_es = es;
2452 sb->s_magic = le16_to_cpu(es->s_magic);
2453 if (sb->s_magic != EXT4_SUPER_MAGIC)
2454 goto cantfind_ext4;
2455 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2456
2457 /* Set defaults before we parse the mount options */
2458 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2459 if (def_mount_opts & EXT4_DEFM_DEBUG)
2460 set_opt(sbi->s_mount_opt, DEBUG);
2461 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
2462 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
2463 "2.6.38");
2464 set_opt(sbi->s_mount_opt, GRPID);
2465 }
2466 if (def_mount_opts & EXT4_DEFM_UID16)
2467 set_opt(sbi->s_mount_opt, NO_UID32);
2468 #ifdef CONFIG_EXT4_FS_XATTR
2469 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2470 set_opt(sbi->s_mount_opt, XATTR_USER);
2471 #endif
2472 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2473 if (def_mount_opts & EXT4_DEFM_ACL)
2474 set_opt(sbi->s_mount_opt, POSIX_ACL);
2475 #endif
2476 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2477 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2478 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2479 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2480 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2481 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2482
2483 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2484 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2485 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2486 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2487 else
2488 set_opt(sbi->s_mount_opt, ERRORS_RO);
2489
2490 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2491 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2492 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2493 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2494 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2495
2496 set_opt(sbi->s_mount_opt, BARRIER);
2497
2498 /*
2499 * enable delayed allocation by default
2500 * Use -o nodelalloc to turn it off
2501 */
2502 set_opt(sbi->s_mount_opt, DELALLOC);
2503
2504 if (!parse_options((char *) data, sb, &journal_devnum,
2505 &journal_ioprio, NULL, 0))
2506 goto failed_mount;
2507
2508 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2509 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2510
2511 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2512 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2513 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2514 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2515 ext4_msg(sb, KERN_WARNING,
2516 "feature flags set on rev 0 fs, "
2517 "running e2fsck is recommended");
2518
2519 /*
2520 * Check feature flags regardless of the revision level, since we
2521 * previously didn't change the revision level when setting the flags,
2522 * so there is a chance incompat flags are set on a rev 0 filesystem.
2523 */
2524 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
2525 goto failed_mount;
2526
2527 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2528
2529 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2530 blocksize > EXT4_MAX_BLOCK_SIZE) {
2531 ext4_msg(sb, KERN_ERR,
2532 "Unsupported filesystem blocksize %d", blocksize);
2533 goto failed_mount;
2534 }
2535
2536 if (sb->s_blocksize != blocksize) {
2537 /* Validate the filesystem blocksize */
2538 if (!sb_set_blocksize(sb, blocksize)) {
2539 ext4_msg(sb, KERN_ERR, "bad block size %d",
2540 blocksize);
2541 goto failed_mount;
2542 }
2543
2544 brelse(bh);
2545 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2546 offset = do_div(logical_sb_block, blocksize);
2547 bh = sb_bread(sb, logical_sb_block);
2548 if (!bh) {
2549 ext4_msg(sb, KERN_ERR,
2550 "Can't read superblock on 2nd try");
2551 goto failed_mount;
2552 }
2553 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2554 sbi->s_es = es;
2555 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2556 ext4_msg(sb, KERN_ERR,
2557 "Magic mismatch, very weird!");
2558 goto failed_mount;
2559 }
2560 }
2561
2562 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2563 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2564 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2565 has_huge_files);
2566 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2567
2568 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2569 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2570 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2571 } else {
2572 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2573 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2574 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2575 (!is_power_of_2(sbi->s_inode_size)) ||
2576 (sbi->s_inode_size > blocksize)) {
2577 ext4_msg(sb, KERN_ERR,
2578 "unsupported inode size: %d",
2579 sbi->s_inode_size);
2580 goto failed_mount;
2581 }
2582 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2583 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2584 }
2585
2586 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2587 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2588 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2589 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2590 !is_power_of_2(sbi->s_desc_size)) {
2591 ext4_msg(sb, KERN_ERR,
2592 "unsupported descriptor size %lu",
2593 sbi->s_desc_size);
2594 goto failed_mount;
2595 }
2596 } else
2597 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2598
2599 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2600 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2601 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2602 goto cantfind_ext4;
2603
2604 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2605 if (sbi->s_inodes_per_block == 0)
2606 goto cantfind_ext4;
2607 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2608 sbi->s_inodes_per_block;
2609 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2610 sbi->s_sbh = bh;
2611 sbi->s_mount_state = le16_to_cpu(es->s_state);
2612 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2613 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2614
2615 for (i = 0; i < 4; i++)
2616 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2617 sbi->s_def_hash_version = es->s_def_hash_version;
2618 i = le32_to_cpu(es->s_flags);
2619 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2620 sbi->s_hash_unsigned = 3;
2621 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2622 #ifdef __CHAR_UNSIGNED__
2623 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2624 sbi->s_hash_unsigned = 3;
2625 #else
2626 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2627 #endif
2628 sb->s_dirt = 1;
2629 }
2630
2631 if (sbi->s_blocks_per_group > blocksize * 8) {
2632 ext4_msg(sb, KERN_ERR,
2633 "#blocks per group too big: %lu",
2634 sbi->s_blocks_per_group);
2635 goto failed_mount;
2636 }
2637 if (sbi->s_inodes_per_group > blocksize * 8) {
2638 ext4_msg(sb, KERN_ERR,
2639 "#inodes per group too big: %lu",
2640 sbi->s_inodes_per_group);
2641 goto failed_mount;
2642 }
2643
2644 /*
2645 * Test whether we have more sectors than will fit in sector_t,
2646 * and whether the max offset is addressable by the page cache.
2647 */
2648 if ((ext4_blocks_count(es) >
2649 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2650 (ext4_blocks_count(es) >
2651 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
2652 ext4_msg(sb, KERN_ERR, "filesystem"
2653 " too large to mount safely on this system");
2654 if (sizeof(sector_t) < 8)
2655 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
2656 ret = -EFBIG;
2657 goto failed_mount;
2658 }
2659
2660 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2661 goto cantfind_ext4;
2662
2663 /* check blocks count against device size */
2664 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2665 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2666 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2667 "exceeds size of device (%llu blocks)",
2668 ext4_blocks_count(es), blocks_count);
2669 goto failed_mount;
2670 }
2671
2672 /*
2673 * It makes no sense for the first data block to be beyond the end
2674 * of the filesystem.
2675 */
2676 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2677 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2678 "block %u is beyond end of filesystem (%llu)",
2679 le32_to_cpu(es->s_first_data_block),
2680 ext4_blocks_count(es));
2681 goto failed_mount;
2682 }
2683 blocks_count = (ext4_blocks_count(es) -
2684 le32_to_cpu(es->s_first_data_block) +
2685 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2686 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2687 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2688 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
2689 "(block count %llu, first data block %u, "
2690 "blocks per group %lu)", sbi->s_groups_count,
2691 ext4_blocks_count(es),
2692 le32_to_cpu(es->s_first_data_block),
2693 EXT4_BLOCKS_PER_GROUP(sb));
2694 goto failed_mount;
2695 }
2696 sbi->s_groups_count = blocks_count;
2697 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2698 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
2699 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2700 EXT4_DESC_PER_BLOCK(sb);
2701 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2702 GFP_KERNEL);
2703 if (sbi->s_group_desc == NULL) {
2704 ext4_msg(sb, KERN_ERR, "not enough memory");
2705 goto failed_mount;
2706 }
2707
2708 #ifdef CONFIG_PROC_FS
2709 if (ext4_proc_root)
2710 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2711 #endif
2712
2713 bgl_lock_init(sbi->s_blockgroup_lock);
2714
2715 for (i = 0; i < db_count; i++) {
2716 block = descriptor_loc(sb, logical_sb_block, i);
2717 sbi->s_group_desc[i] = sb_bread(sb, block);
2718 if (!sbi->s_group_desc[i]) {
2719 ext4_msg(sb, KERN_ERR,
2720 "can't read group descriptor %d", i);
2721 db_count = i;
2722 goto failed_mount2;
2723 }
2724 }
2725 if (!ext4_check_descriptors(sb)) {
2726 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
2727 goto failed_mount2;
2728 }
2729 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2730 if (!ext4_fill_flex_info(sb)) {
2731 ext4_msg(sb, KERN_ERR,
2732 "unable to initialize "
2733 "flex_bg meta info!");
2734 goto failed_mount2;
2735 }
2736
2737 sbi->s_gdb_count = db_count;
2738 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2739 spin_lock_init(&sbi->s_next_gen_lock);
2740
2741 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2742 ext4_count_free_blocks(sb));
2743 if (!err) {
2744 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2745 ext4_count_free_inodes(sb));
2746 }
2747 if (!err) {
2748 err = percpu_counter_init(&sbi->s_dirs_counter,
2749 ext4_count_dirs(sb));
2750 }
2751 if (!err) {
2752 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2753 }
2754 if (err) {
2755 ext4_msg(sb, KERN_ERR, "insufficient memory");
2756 goto failed_mount3;
2757 }
2758
2759 sbi->s_stripe = ext4_get_stripe_size(sbi);
2760 sbi->s_max_writeback_mb_bump = 128;
2761
2762 /*
2763 * set up enough so that it can read an inode
2764 */
2765 if (!test_opt(sb, NOLOAD) &&
2766 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2767 sb->s_op = &ext4_sops;
2768 else
2769 sb->s_op = &ext4_nojournal_sops;
2770 sb->s_export_op = &ext4_export_ops;
2771 sb->s_xattr = ext4_xattr_handlers;
2772 #ifdef CONFIG_QUOTA
2773 sb->s_qcop = &ext4_qctl_operations;
2774 sb->dq_op = &ext4_quota_operations;
2775 #endif
2776 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2777 mutex_init(&sbi->s_orphan_lock);
2778 mutex_init(&sbi->s_resize_lock);
2779
2780 sb->s_root = NULL;
2781
2782 needs_recovery = (es->s_last_orphan != 0 ||
2783 EXT4_HAS_INCOMPAT_FEATURE(sb,
2784 EXT4_FEATURE_INCOMPAT_RECOVER));
2785
2786 /*
2787 * The first inode we look at is the journal inode. Don't try
2788 * root first: it may be modified in the journal!
2789 */
2790 if (!test_opt(sb, NOLOAD) &&
2791 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2792 if (ext4_load_journal(sb, es, journal_devnum))
2793 goto failed_mount3;
2794 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2795 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2796 ext4_msg(sb, KERN_ERR, "required journal recovery "
2797 "suppressed and not mounted read-only");
2798 goto failed_mount4;
2799 } else {
2800 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2801 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2802 sbi->s_journal = NULL;
2803 needs_recovery = 0;
2804 goto no_journal;
2805 }
2806
2807 if (ext4_blocks_count(es) > 0xffffffffULL &&
2808 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2809 JBD2_FEATURE_INCOMPAT_64BIT)) {
2810 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
2811 goto failed_mount4;
2812 }
2813
2814 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2815 jbd2_journal_set_features(sbi->s_journal,
2816 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2817 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2818 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2819 jbd2_journal_set_features(sbi->s_journal,
2820 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2821 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2822 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2823 } else {
2824 jbd2_journal_clear_features(sbi->s_journal,
2825 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2826 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2827 }
2828
2829 /* We have now updated the journal if required, so we can
2830 * validate the data journaling mode. */
2831 switch (test_opt(sb, DATA_FLAGS)) {
2832 case 0:
2833 /* No mode set, assume a default based on the journal
2834 * capabilities: ORDERED_DATA if the journal can
2835 * cope, else JOURNAL_DATA
2836 */
2837 if (jbd2_journal_check_available_features
2838 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2839 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2840 else
2841 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2842 break;
2843
2844 case EXT4_MOUNT_ORDERED_DATA:
2845 case EXT4_MOUNT_WRITEBACK_DATA:
2846 if (!jbd2_journal_check_available_features
2847 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2848 ext4_msg(sb, KERN_ERR, "Journal does not support "
2849 "requested data journaling mode");
2850 goto failed_mount4;
2851 }
2852 default:
2853 break;
2854 }
2855 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2856
2857 no_journal:
2858
2859 if (test_opt(sb, NOBH)) {
2860 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2861 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2862 "its supported only with writeback mode");
2863 clear_opt(sbi->s_mount_opt, NOBH);
2864 }
2865 }
2866 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2867 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2868 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2869 goto failed_mount_wq;
2870 }
2871
2872 /*
2873 * The jbd2_journal_load will have done any necessary log recovery,
2874 * so we can safely mount the rest of the filesystem now.
2875 */
2876
2877 root = ext4_iget(sb, EXT4_ROOT_INO);
2878 if (IS_ERR(root)) {
2879 ext4_msg(sb, KERN_ERR, "get root inode failed");
2880 ret = PTR_ERR(root);
2881 goto failed_mount4;
2882 }
2883 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2884 iput(root);
2885 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
2886 goto failed_mount4;
2887 }
2888 sb->s_root = d_alloc_root(root);
2889 if (!sb->s_root) {
2890 ext4_msg(sb, KERN_ERR, "get root dentry failed");
2891 iput(root);
2892 ret = -ENOMEM;
2893 goto failed_mount4;
2894 }
2895
2896 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2897
2898 /* determine the minimum size of new large inodes, if present */
2899 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2900 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2901 EXT4_GOOD_OLD_INODE_SIZE;
2902 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2903 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2904 if (sbi->s_want_extra_isize <
2905 le16_to_cpu(es->s_want_extra_isize))
2906 sbi->s_want_extra_isize =
2907 le16_to_cpu(es->s_want_extra_isize);
2908 if (sbi->s_want_extra_isize <
2909 le16_to_cpu(es->s_min_extra_isize))
2910 sbi->s_want_extra_isize =
2911 le16_to_cpu(es->s_min_extra_isize);
2912 }
2913 }
2914 /* Check if enough inode space is available */
2915 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2916 sbi->s_inode_size) {
2917 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2918 EXT4_GOOD_OLD_INODE_SIZE;
2919 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2920 "available");
2921 }
2922
2923 if (test_opt(sb, DELALLOC) &&
2924 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2925 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2926 "requested data journaling mode");
2927 clear_opt(sbi->s_mount_opt, DELALLOC);
2928 }
2929
2930 err = ext4_setup_system_zone(sb);
2931 if (err) {
2932 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2933 "zone (%d)\n", err);
2934 goto failed_mount4;
2935 }
2936
2937 ext4_ext_init(sb);
2938 err = ext4_mb_init(sb, needs_recovery);
2939 if (err) {
2940 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2941 err);
2942 goto failed_mount4;
2943 }
2944
2945 sbi->s_kobj.kset = ext4_kset;
2946 init_completion(&sbi->s_kobj_unregister);
2947 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2948 "%s", sb->s_id);
2949 if (err) {
2950 ext4_mb_release(sb);
2951 ext4_ext_release(sb);
2952 goto failed_mount4;
2953 };
2954
2955 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2956 ext4_orphan_cleanup(sb, es);
2957 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2958 if (needs_recovery) {
2959 ext4_msg(sb, KERN_INFO, "recovery complete");
2960 ext4_mark_recovery_complete(sb, es);
2961 }
2962 if (EXT4_SB(sb)->s_journal) {
2963 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2964 descr = " journalled data mode";
2965 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2966 descr = " ordered data mode";
2967 else
2968 descr = " writeback data mode";
2969 } else
2970 descr = "out journal";
2971
2972 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
2973
2974 lock_kernel();
2975 return 0;
2976
2977 cantfind_ext4:
2978 if (!silent)
2979 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
2980 goto failed_mount;
2981
2982 failed_mount4:
2983 ext4_msg(sb, KERN_ERR, "mount failed");
2984 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2985 failed_mount_wq:
2986 ext4_release_system_zone(sb);
2987 if (sbi->s_journal) {
2988 jbd2_journal_destroy(sbi->s_journal);
2989 sbi->s_journal = NULL;
2990 }
2991 failed_mount3:
2992 if (sbi->s_flex_groups) {
2993 if (is_vmalloc_addr(sbi->s_flex_groups))
2994 vfree(sbi->s_flex_groups);
2995 else
2996 kfree(sbi->s_flex_groups);
2997 }
2998 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2999 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3000 percpu_counter_destroy(&sbi->s_dirs_counter);
3001 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3002 failed_mount2:
3003 for (i = 0; i < db_count; i++)
3004 brelse(sbi->s_group_desc[i]);
3005 kfree(sbi->s_group_desc);
3006 failed_mount:
3007 if (sbi->s_proc) {
3008 remove_proc_entry(sb->s_id, ext4_proc_root);
3009 }
3010 #ifdef CONFIG_QUOTA
3011 for (i = 0; i < MAXQUOTAS; i++)
3012 kfree(sbi->s_qf_names[i]);
3013 #endif
3014 ext4_blkdev_remove(sbi);
3015 brelse(bh);
3016 out_fail:
3017 sb->s_fs_info = NULL;
3018 kfree(sbi->s_blockgroup_lock);
3019 kfree(sbi);
3020 lock_kernel();
3021 return ret;
3022 }
3023
3024 /*
3025 * Setup any per-fs journal parameters now. We'll do this both on
3026 * initial mount, once the journal has been initialised but before we've
3027 * done any recovery; and again on any subsequent remount.
3028 */
3029 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3030 {
3031 struct ext4_sb_info *sbi = EXT4_SB(sb);
3032
3033 journal->j_commit_interval = sbi->s_commit_interval;
3034 journal->j_min_batch_time = sbi->s_min_batch_time;
3035 journal->j_max_batch_time = sbi->s_max_batch_time;
3036
3037 spin_lock(&journal->j_state_lock);
3038 if (test_opt(sb, BARRIER))
3039 journal->j_flags |= JBD2_BARRIER;
3040 else
3041 journal->j_flags &= ~JBD2_BARRIER;
3042 if (test_opt(sb, DATA_ERR_ABORT))
3043 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3044 else
3045 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3046 spin_unlock(&journal->j_state_lock);
3047 }
3048
3049 static journal_t *ext4_get_journal(struct super_block *sb,
3050 unsigned int journal_inum)
3051 {
3052 struct inode *journal_inode;
3053 journal_t *journal;
3054
3055 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3056
3057 /* First, test for the existence of a valid inode on disk. Bad
3058 * things happen if we iget() an unused inode, as the subsequent
3059 * iput() will try to delete it. */
3060
3061 journal_inode = ext4_iget(sb, journal_inum);
3062 if (IS_ERR(journal_inode)) {
3063 ext4_msg(sb, KERN_ERR, "no journal found");
3064 return NULL;
3065 }
3066 if (!journal_inode->i_nlink) {
3067 make_bad_inode(journal_inode);
3068 iput(journal_inode);
3069 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3070 return NULL;
3071 }
3072
3073 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3074 journal_inode, journal_inode->i_size);
3075 if (!S_ISREG(journal_inode->i_mode)) {
3076 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3077 iput(journal_inode);
3078 return NULL;
3079 }
3080
3081 journal = jbd2_journal_init_inode(journal_inode);
3082 if (!journal) {
3083 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3084 iput(journal_inode);
3085 return NULL;
3086 }
3087 journal->j_private = sb;
3088 ext4_init_journal_params(sb, journal);
3089 return journal;
3090 }
3091
3092 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3093 dev_t j_dev)
3094 {
3095 struct buffer_head *bh;
3096 journal_t *journal;
3097 ext4_fsblk_t start;
3098 ext4_fsblk_t len;
3099 int hblock, blocksize;
3100 ext4_fsblk_t sb_block;
3101 unsigned long offset;
3102 struct ext4_super_block *es;
3103 struct block_device *bdev;
3104
3105 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3106
3107 bdev = ext4_blkdev_get(j_dev, sb);
3108 if (bdev == NULL)
3109 return NULL;
3110
3111 if (bd_claim(bdev, sb)) {
3112 ext4_msg(sb, KERN_ERR,
3113 "failed to claim external journal device");
3114 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3115 return NULL;
3116 }
3117
3118 blocksize = sb->s_blocksize;
3119 hblock = bdev_logical_block_size(bdev);
3120 if (blocksize < hblock) {
3121 ext4_msg(sb, KERN_ERR,
3122 "blocksize too small for journal device");
3123 goto out_bdev;
3124 }
3125
3126 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3127 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3128 set_blocksize(bdev, blocksize);
3129 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3130 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3131 "external journal");
3132 goto out_bdev;
3133 }
3134
3135 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3136 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3137 !(le32_to_cpu(es->s_feature_incompat) &
3138 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3139 ext4_msg(sb, KERN_ERR, "external journal has "
3140 "bad superblock");
3141 brelse(bh);
3142 goto out_bdev;
3143 }
3144
3145 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3146 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3147 brelse(bh);
3148 goto out_bdev;
3149 }
3150
3151 len = ext4_blocks_count(es);
3152 start = sb_block + 1;
3153 brelse(bh); /* we're done with the superblock */
3154
3155 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3156 start, len, blocksize);
3157 if (!journal) {
3158 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3159 goto out_bdev;
3160 }
3161 journal->j_private = sb;
3162 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3163 wait_on_buffer(journal->j_sb_buffer);
3164 if (!buffer_uptodate(journal->j_sb_buffer)) {
3165 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3166 goto out_journal;
3167 }
3168 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3169 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3170 "user (unsupported) - %d",
3171 be32_to_cpu(journal->j_superblock->s_nr_users));
3172 goto out_journal;
3173 }
3174 EXT4_SB(sb)->journal_bdev = bdev;
3175 ext4_init_journal_params(sb, journal);
3176 return journal;
3177
3178 out_journal:
3179 jbd2_journal_destroy(journal);
3180 out_bdev:
3181 ext4_blkdev_put(bdev);
3182 return NULL;
3183 }
3184
3185 static int ext4_load_journal(struct super_block *sb,
3186 struct ext4_super_block *es,
3187 unsigned long journal_devnum)
3188 {
3189 journal_t *journal;
3190 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3191 dev_t journal_dev;
3192 int err = 0;
3193 int really_read_only;
3194
3195 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3196
3197 if (journal_devnum &&
3198 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3199 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3200 "numbers have changed");
3201 journal_dev = new_decode_dev(journal_devnum);
3202 } else
3203 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3204
3205 really_read_only = bdev_read_only(sb->s_bdev);
3206
3207 /*
3208 * Are we loading a blank journal or performing recovery after a
3209 * crash? For recovery, we need to check in advance whether we
3210 * can get read-write access to the device.
3211 */
3212 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3213 if (sb->s_flags & MS_RDONLY) {
3214 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3215 "required on readonly filesystem");
3216 if (really_read_only) {
3217 ext4_msg(sb, KERN_ERR, "write access "
3218 "unavailable, cannot proceed");
3219 return -EROFS;
3220 }
3221 ext4_msg(sb, KERN_INFO, "write access will "
3222 "be enabled during recovery");
3223 }
3224 }
3225
3226 if (journal_inum && journal_dev) {
3227 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3228 "and inode journals!");
3229 return -EINVAL;
3230 }
3231
3232 if (journal_inum) {
3233 if (!(journal = ext4_get_journal(sb, journal_inum)))
3234 return -EINVAL;
3235 } else {
3236 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3237 return -EINVAL;
3238 }
3239
3240 if (!(journal->j_flags & JBD2_BARRIER))
3241 ext4_msg(sb, KERN_INFO, "barriers disabled");
3242
3243 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3244 err = jbd2_journal_update_format(journal);
3245 if (err) {
3246 ext4_msg(sb, KERN_ERR, "error updating journal");
3247 jbd2_journal_destroy(journal);
3248 return err;
3249 }
3250 }
3251
3252 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3253 err = jbd2_journal_wipe(journal, !really_read_only);
3254 if (!err)
3255 err = jbd2_journal_load(journal);
3256
3257 if (err) {
3258 ext4_msg(sb, KERN_ERR, "error loading journal");
3259 jbd2_journal_destroy(journal);
3260 return err;
3261 }
3262
3263 EXT4_SB(sb)->s_journal = journal;
3264 ext4_clear_journal_err(sb, es);
3265
3266 if (journal_devnum &&
3267 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3268 es->s_journal_dev = cpu_to_le32(journal_devnum);
3269
3270 /* Make sure we flush the recovery flag to disk. */
3271 ext4_commit_super(sb, 1);
3272 }
3273
3274 return 0;
3275 }
3276
3277 static int ext4_commit_super(struct super_block *sb, int sync)
3278 {
3279 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3280 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3281 int error = 0;
3282
3283 if (!sbh)
3284 return error;
3285 if (buffer_write_io_error(sbh)) {
3286 /*
3287 * Oh, dear. A previous attempt to write the
3288 * superblock failed. This could happen because the
3289 * USB device was yanked out. Or it could happen to
3290 * be a transient write error and maybe the block will
3291 * be remapped. Nothing we can do but to retry the
3292 * write and hope for the best.
3293 */
3294 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3295 "superblock detected");
3296 clear_buffer_write_io_error(sbh);
3297 set_buffer_uptodate(sbh);
3298 }
3299 /*
3300 * If the file system is mounted read-only, don't update the
3301 * superblock write time. This avoids updating the superblock
3302 * write time when we are mounting the root file system
3303 * read/only but we need to replay the journal; at that point,
3304 * for people who are east of GMT and who make their clock
3305 * tick in localtime for Windows bug-for-bug compatibility,
3306 * the clock is set in the future, and this will cause e2fsck
3307 * to complain and force a full file system check.
3308 */
3309 if (!(sb->s_flags & MS_RDONLY))
3310 es->s_wtime = cpu_to_le32(get_seconds());
3311 es->s_kbytes_written =
3312 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3313 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3314 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3315 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3316 &EXT4_SB(sb)->s_freeblocks_counter));
3317 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3318 &EXT4_SB(sb)->s_freeinodes_counter));
3319 sb->s_dirt = 0;
3320 BUFFER_TRACE(sbh, "marking dirty");
3321 mark_buffer_dirty(sbh);
3322 if (sync) {
3323 error = sync_dirty_buffer(sbh);
3324 if (error)
3325 return error;
3326
3327 error = buffer_write_io_error(sbh);
3328 if (error) {
3329 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3330 "superblock");
3331 clear_buffer_write_io_error(sbh);
3332 set_buffer_uptodate(sbh);
3333 }
3334 }
3335 return error;
3336 }
3337
3338 /*
3339 * Have we just finished recovery? If so, and if we are mounting (or
3340 * remounting) the filesystem readonly, then we will end up with a
3341 * consistent fs on disk. Record that fact.
3342 */
3343 static void ext4_mark_recovery_complete(struct super_block *sb,
3344 struct ext4_super_block *es)
3345 {
3346 journal_t *journal = EXT4_SB(sb)->s_journal;
3347
3348 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3349 BUG_ON(journal != NULL);
3350 return;
3351 }
3352 jbd2_journal_lock_updates(journal);
3353 if (jbd2_journal_flush(journal) < 0)
3354 goto out;
3355
3356 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
3357 sb->s_flags & MS_RDONLY) {
3358 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3359 ext4_commit_super(sb, 1);
3360 }
3361
3362 out:
3363 jbd2_journal_unlock_updates(journal);
3364 }
3365
3366 /*
3367 * If we are mounting (or read-write remounting) a filesystem whose journal
3368 * has recorded an error from a previous lifetime, move that error to the
3369 * main filesystem now.
3370 */
3371 static void ext4_clear_journal_err(struct super_block *sb,
3372 struct ext4_super_block *es)
3373 {
3374 journal_t *journal;
3375 int j_errno;
3376 const char *errstr;
3377
3378 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3379
3380 journal = EXT4_SB(sb)->s_journal;
3381
3382 /*
3383 * Now check for any error status which may have been recorded in the
3384 * journal by a prior ext4_error() or ext4_abort()
3385 */
3386
3387 j_errno = jbd2_journal_errno(journal);
3388 if (j_errno) {
3389 char nbuf[16];
3390
3391 errstr = ext4_decode_error(sb, j_errno, nbuf);
3392 ext4_warning(sb, "Filesystem error recorded "
3393 "from previous mount: %s", errstr);
3394 ext4_warning(sb, "Marking fs in need of filesystem check.");
3395
3396 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3397 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3398 ext4_commit_super(sb, 1);
3399
3400 jbd2_journal_clear_err(journal);
3401 }
3402 }
3403
3404 /*
3405 * Force the running and committing transactions to commit,
3406 * and wait on the commit.
3407 */
3408 int ext4_force_commit(struct super_block *sb)
3409 {
3410 journal_t *journal;
3411 int ret = 0;
3412
3413 if (sb->s_flags & MS_RDONLY)
3414 return 0;
3415
3416 journal = EXT4_SB(sb)->s_journal;
3417 if (journal)
3418 ret = ext4_journal_force_commit(journal);
3419
3420 return ret;
3421 }
3422
3423 static void ext4_write_super(struct super_block *sb)
3424 {
3425 lock_super(sb);
3426 ext4_commit_super(sb, 1);
3427 unlock_super(sb);
3428 }
3429
3430 static int ext4_sync_fs(struct super_block *sb, int wait)
3431 {
3432 int ret = 0;
3433 tid_t target;
3434 struct ext4_sb_info *sbi = EXT4_SB(sb);
3435
3436 trace_ext4_sync_fs(sb, wait);
3437 flush_workqueue(sbi->dio_unwritten_wq);
3438 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
3439 if (wait)
3440 jbd2_log_wait_commit(sbi->s_journal, target);
3441 }
3442 return ret;
3443 }
3444
3445 /*
3446 * LVM calls this function before a (read-only) snapshot is created. This
3447 * gives us a chance to flush the journal completely and mark the fs clean.
3448 */
3449 static int ext4_freeze(struct super_block *sb)
3450 {
3451 int error = 0;
3452 journal_t *journal;
3453
3454 if (sb->s_flags & MS_RDONLY)
3455 return 0;
3456
3457 journal = EXT4_SB(sb)->s_journal;
3458
3459 /* Now we set up the journal barrier. */
3460 jbd2_journal_lock_updates(journal);
3461
3462 /*
3463 * Don't clear the needs_recovery flag if we failed to flush
3464 * the journal.
3465 */
3466 error = jbd2_journal_flush(journal);
3467 if (error < 0) {
3468 out:
3469 jbd2_journal_unlock_updates(journal);
3470 return error;
3471 }
3472
3473 /* Journal blocked and flushed, clear needs_recovery flag. */
3474 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3475 error = ext4_commit_super(sb, 1);
3476 if (error)
3477 goto out;
3478 return 0;
3479 }
3480
3481 /*
3482 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3483 * flag here, even though the filesystem is not technically dirty yet.
3484 */
3485 static int ext4_unfreeze(struct super_block *sb)
3486 {
3487 if (sb->s_flags & MS_RDONLY)
3488 return 0;
3489
3490 lock_super(sb);
3491 /* Reset the needs_recovery flag before the fs is unlocked. */
3492 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3493 ext4_commit_super(sb, 1);
3494 unlock_super(sb);
3495 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3496 return 0;
3497 }
3498
3499 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3500 {
3501 struct ext4_super_block *es;
3502 struct ext4_sb_info *sbi = EXT4_SB(sb);
3503 ext4_fsblk_t n_blocks_count = 0;
3504 unsigned long old_sb_flags;
3505 struct ext4_mount_options old_opts;
3506 ext4_group_t g;
3507 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3508 int err;
3509 #ifdef CONFIG_QUOTA
3510 int i;
3511 #endif
3512
3513 lock_kernel();
3514
3515 /* Store the original options */
3516 lock_super(sb);
3517 old_sb_flags = sb->s_flags;
3518 old_opts.s_mount_opt = sbi->s_mount_opt;
3519 old_opts.s_resuid = sbi->s_resuid;
3520 old_opts.s_resgid = sbi->s_resgid;
3521 old_opts.s_commit_interval = sbi->s_commit_interval;
3522 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3523 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3524 #ifdef CONFIG_QUOTA
3525 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3526 for (i = 0; i < MAXQUOTAS; i++)
3527 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3528 #endif
3529 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3530 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3531
3532 /*
3533 * Allow the "check" option to be passed as a remount option.
3534 */
3535 if (!parse_options(data, sb, NULL, &journal_ioprio,
3536 &n_blocks_count, 1)) {
3537 err = -EINVAL;
3538 goto restore_opts;
3539 }
3540
3541 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
3542 ext4_abort(sb, __func__, "Abort forced by user");
3543
3544 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3545 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3546
3547 es = sbi->s_es;
3548
3549 if (sbi->s_journal) {
3550 ext4_init_journal_params(sb, sbi->s_journal);
3551 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3552 }
3553
3554 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3555 n_blocks_count > ext4_blocks_count(es)) {
3556 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
3557 err = -EROFS;
3558 goto restore_opts;
3559 }
3560
3561 if (*flags & MS_RDONLY) {
3562 /*
3563 * First of all, the unconditional stuff we have to do
3564 * to disable replay of the journal when we next remount
3565 */
3566 sb->s_flags |= MS_RDONLY;
3567
3568 /*
3569 * OK, test if we are remounting a valid rw partition
3570 * readonly, and if so set the rdonly flag and then
3571 * mark the partition as valid again.
3572 */
3573 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3574 (sbi->s_mount_state & EXT4_VALID_FS))
3575 es->s_state = cpu_to_le16(sbi->s_mount_state);
3576
3577 if (sbi->s_journal)
3578 ext4_mark_recovery_complete(sb, es);
3579 } else {
3580 /* Make sure we can mount this feature set readwrite */
3581 if (!ext4_feature_set_ok(sb, 0)) {
3582 err = -EROFS;
3583 goto restore_opts;
3584 }
3585 /*
3586 * Make sure the group descriptor checksums
3587 * are sane. If they aren't, refuse to remount r/w.
3588 */
3589 for (g = 0; g < sbi->s_groups_count; g++) {
3590 struct ext4_group_desc *gdp =
3591 ext4_get_group_desc(sb, g, NULL);
3592
3593 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3594 ext4_msg(sb, KERN_ERR,
3595 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3596 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3597 le16_to_cpu(gdp->bg_checksum));
3598 err = -EINVAL;
3599 goto restore_opts;
3600 }
3601 }
3602
3603 /*
3604 * If we have an unprocessed orphan list hanging
3605 * around from a previously readonly bdev mount,
3606 * require a full umount/remount for now.
3607 */
3608 if (es->s_last_orphan) {
3609 ext4_msg(sb, KERN_WARNING, "Couldn't "
3610 "remount RDWR because of unprocessed "
3611 "orphan inode list. Please "
3612 "umount/remount instead");
3613 err = -EINVAL;
3614 goto restore_opts;
3615 }
3616
3617 /*
3618 * Mounting a RDONLY partition read-write, so reread
3619 * and store the current valid flag. (It may have
3620 * been changed by e2fsck since we originally mounted
3621 * the partition.)
3622 */
3623 if (sbi->s_journal)
3624 ext4_clear_journal_err(sb, es);
3625 sbi->s_mount_state = le16_to_cpu(es->s_state);
3626 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3627 goto restore_opts;
3628 if (!ext4_setup_super(sb, es, 0))
3629 sb->s_flags &= ~MS_RDONLY;
3630 }
3631 }
3632 ext4_setup_system_zone(sb);
3633 if (sbi->s_journal == NULL)
3634 ext4_commit_super(sb, 1);
3635
3636 #ifdef CONFIG_QUOTA
3637 /* Release old quota file names */
3638 for (i = 0; i < MAXQUOTAS; i++)
3639 if (old_opts.s_qf_names[i] &&
3640 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3641 kfree(old_opts.s_qf_names[i]);
3642 #endif
3643 unlock_super(sb);
3644 unlock_kernel();
3645 return 0;
3646
3647 restore_opts:
3648 sb->s_flags = old_sb_flags;
3649 sbi->s_mount_opt = old_opts.s_mount_opt;
3650 sbi->s_resuid = old_opts.s_resuid;
3651 sbi->s_resgid = old_opts.s_resgid;
3652 sbi->s_commit_interval = old_opts.s_commit_interval;
3653 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3654 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3655 #ifdef CONFIG_QUOTA
3656 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3657 for (i = 0; i < MAXQUOTAS; i++) {
3658 if (sbi->s_qf_names[i] &&
3659 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3660 kfree(sbi->s_qf_names[i]);
3661 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3662 }
3663 #endif
3664 unlock_super(sb);
3665 unlock_kernel();
3666 return err;
3667 }
3668
3669 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3670 {
3671 struct super_block *sb = dentry->d_sb;
3672 struct ext4_sb_info *sbi = EXT4_SB(sb);
3673 struct ext4_super_block *es = sbi->s_es;
3674 u64 fsid;
3675
3676 if (test_opt(sb, MINIX_DF)) {
3677 sbi->s_overhead_last = 0;
3678 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3679 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3680 ext4_fsblk_t overhead = 0;
3681
3682 /*
3683 * Compute the overhead (FS structures). This is constant
3684 * for a given filesystem unless the number of block groups
3685 * changes so we cache the previous value until it does.
3686 */
3687
3688 /*
3689 * All of the blocks before first_data_block are
3690 * overhead
3691 */
3692 overhead = le32_to_cpu(es->s_first_data_block);
3693
3694 /*
3695 * Add the overhead attributed to the superblock and
3696 * block group descriptors. If the sparse superblocks
3697 * feature is turned on, then not all groups have this.
3698 */
3699 for (i = 0; i < ngroups; i++) {
3700 overhead += ext4_bg_has_super(sb, i) +
3701 ext4_bg_num_gdb(sb, i);
3702 cond_resched();
3703 }
3704
3705 /*
3706 * Every block group has an inode bitmap, a block
3707 * bitmap, and an inode table.
3708 */
3709 overhead += ngroups * (2 + sbi->s_itb_per_group);
3710 sbi->s_overhead_last = overhead;
3711 smp_wmb();
3712 sbi->s_blocks_last = ext4_blocks_count(es);
3713 }
3714
3715 buf->f_type = EXT4_SUPER_MAGIC;
3716 buf->f_bsize = sb->s_blocksize;
3717 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3718 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3719 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3720 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3721 if (buf->f_bfree < ext4_r_blocks_count(es))
3722 buf->f_bavail = 0;
3723 buf->f_files = le32_to_cpu(es->s_inodes_count);
3724 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3725 buf->f_namelen = EXT4_NAME_LEN;
3726 fsid = le64_to_cpup((void *)es->s_uuid) ^
3727 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3728 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3729 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3730
3731 return 0;
3732 }
3733
3734 /* Helper function for writing quotas on sync - we need to start transaction
3735 * before quota file is locked for write. Otherwise the are possible deadlocks:
3736 * Process 1 Process 2
3737 * ext4_create() quota_sync()
3738 * jbd2_journal_start() write_dquot()
3739 * vfs_dq_init() down(dqio_mutex)
3740 * down(dqio_mutex) jbd2_journal_start()
3741 *
3742 */
3743
3744 #ifdef CONFIG_QUOTA
3745
3746 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3747 {
3748 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3749 }
3750
3751 static int ext4_write_dquot(struct dquot *dquot)
3752 {
3753 int ret, err;
3754 handle_t *handle;
3755 struct inode *inode;
3756
3757 inode = dquot_to_inode(dquot);
3758 handle = ext4_journal_start(inode,
3759 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3760 if (IS_ERR(handle))
3761 return PTR_ERR(handle);
3762 ret = dquot_commit(dquot);
3763 err = ext4_journal_stop(handle);
3764 if (!ret)
3765 ret = err;
3766 return ret;
3767 }
3768
3769 static int ext4_acquire_dquot(struct dquot *dquot)
3770 {
3771 int ret, err;
3772 handle_t *handle;
3773
3774 handle = ext4_journal_start(dquot_to_inode(dquot),
3775 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3776 if (IS_ERR(handle))
3777 return PTR_ERR(handle);
3778 ret = dquot_acquire(dquot);
3779 err = ext4_journal_stop(handle);
3780 if (!ret)
3781 ret = err;
3782 return ret;
3783 }
3784
3785 static int ext4_release_dquot(struct dquot *dquot)
3786 {
3787 int ret, err;
3788 handle_t *handle;
3789
3790 handle = ext4_journal_start(dquot_to_inode(dquot),
3791 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3792 if (IS_ERR(handle)) {
3793 /* Release dquot anyway to avoid endless cycle in dqput() */
3794 dquot_release(dquot);
3795 return PTR_ERR(handle);
3796 }
3797 ret = dquot_release(dquot);
3798 err = ext4_journal_stop(handle);
3799 if (!ret)
3800 ret = err;
3801 return ret;
3802 }
3803
3804 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3805 {
3806 /* Are we journaling quotas? */
3807 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3808 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3809 dquot_mark_dquot_dirty(dquot);
3810 return ext4_write_dquot(dquot);
3811 } else {
3812 return dquot_mark_dquot_dirty(dquot);
3813 }
3814 }
3815
3816 static int ext4_write_info(struct super_block *sb, int type)
3817 {
3818 int ret, err;
3819 handle_t *handle;
3820
3821 /* Data block + inode block */
3822 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3823 if (IS_ERR(handle))
3824 return PTR_ERR(handle);
3825 ret = dquot_commit_info(sb, type);
3826 err = ext4_journal_stop(handle);
3827 if (!ret)
3828 ret = err;
3829 return ret;
3830 }
3831
3832 /*
3833 * Turn on quotas during mount time - we need to find
3834 * the quota file and such...
3835 */
3836 static int ext4_quota_on_mount(struct super_block *sb, int type)
3837 {
3838 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3839 EXT4_SB(sb)->s_jquota_fmt, type);
3840 }
3841
3842 /*
3843 * Standard function to be called on quota_on
3844 */
3845 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3846 char *name, int remount)
3847 {
3848 int err;
3849 struct path path;
3850
3851 if (!test_opt(sb, QUOTA))
3852 return -EINVAL;
3853 /* When remounting, no checks are needed and in fact, name is NULL */
3854 if (remount)
3855 return vfs_quota_on(sb, type, format_id, name, remount);
3856
3857 err = kern_path(name, LOOKUP_FOLLOW, &path);
3858 if (err)
3859 return err;
3860
3861 /* Quotafile not on the same filesystem? */
3862 if (path.mnt->mnt_sb != sb) {
3863 path_put(&path);
3864 return -EXDEV;
3865 }
3866 /* Journaling quota? */
3867 if (EXT4_SB(sb)->s_qf_names[type]) {
3868 /* Quotafile not in fs root? */
3869 if (path.dentry->d_parent != sb->s_root)
3870 ext4_msg(sb, KERN_WARNING,
3871 "Quota file not on filesystem root. "
3872 "Journaled quota will not work");
3873 }
3874
3875 /*
3876 * When we journal data on quota file, we have to flush journal to see
3877 * all updates to the file when we bypass pagecache...
3878 */
3879 if (EXT4_SB(sb)->s_journal &&
3880 ext4_should_journal_data(path.dentry->d_inode)) {
3881 /*
3882 * We don't need to lock updates but journal_flush() could
3883 * otherwise be livelocked...
3884 */
3885 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3886 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3887 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3888 if (err) {
3889 path_put(&path);
3890 return err;
3891 }
3892 }
3893
3894 err = vfs_quota_on_path(sb, type, format_id, &path);
3895 path_put(&path);
3896 return err;
3897 }
3898
3899 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3900 * acquiring the locks... As quota files are never truncated and quota code
3901 * itself serializes the operations (and noone else should touch the files)
3902 * we don't have to be afraid of races */
3903 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3904 size_t len, loff_t off)
3905 {
3906 struct inode *inode = sb_dqopt(sb)->files[type];
3907 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3908 int err = 0;
3909 int offset = off & (sb->s_blocksize - 1);
3910 int tocopy;
3911 size_t toread;
3912 struct buffer_head *bh;
3913 loff_t i_size = i_size_read(inode);
3914
3915 if (off > i_size)
3916 return 0;
3917 if (off+len > i_size)
3918 len = i_size-off;
3919 toread = len;
3920 while (toread > 0) {
3921 tocopy = sb->s_blocksize - offset < toread ?
3922 sb->s_blocksize - offset : toread;
3923 bh = ext4_bread(NULL, inode, blk, 0, &err);
3924 if (err)
3925 return err;
3926 if (!bh) /* A hole? */
3927 memset(data, 0, tocopy);
3928 else
3929 memcpy(data, bh->b_data+offset, tocopy);
3930 brelse(bh);
3931 offset = 0;
3932 toread -= tocopy;
3933 data += tocopy;
3934 blk++;
3935 }
3936 return len;
3937 }
3938
3939 /* Write to quotafile (we know the transaction is already started and has
3940 * enough credits) */
3941 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3942 const char *data, size_t len, loff_t off)
3943 {
3944 struct inode *inode = sb_dqopt(sb)->files[type];
3945 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3946 int err = 0;
3947 int offset = off & (sb->s_blocksize - 1);
3948 int tocopy;
3949 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3950 size_t towrite = len;
3951 struct buffer_head *bh;
3952 handle_t *handle = journal_current_handle();
3953
3954 if (EXT4_SB(sb)->s_journal && !handle) {
3955 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3956 " cancelled because transaction is not started",
3957 (unsigned long long)off, (unsigned long long)len);
3958 return -EIO;
3959 }
3960 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3961 while (towrite > 0) {
3962 tocopy = sb->s_blocksize - offset < towrite ?
3963 sb->s_blocksize - offset : towrite;
3964 bh = ext4_bread(handle, inode, blk, 1, &err);
3965 if (!bh)
3966 goto out;
3967 if (journal_quota) {
3968 err = ext4_journal_get_write_access(handle, bh);
3969 if (err) {
3970 brelse(bh);
3971 goto out;
3972 }
3973 }
3974 lock_buffer(bh);
3975 memcpy(bh->b_data+offset, data, tocopy);
3976 flush_dcache_page(bh->b_page);
3977 unlock_buffer(bh);
3978 if (journal_quota)
3979 err = ext4_handle_dirty_metadata(handle, NULL, bh);
3980 else {
3981 /* Always do at least ordered writes for quotas */
3982 err = ext4_jbd2_file_inode(handle, inode);
3983 mark_buffer_dirty(bh);
3984 }
3985 brelse(bh);
3986 if (err)
3987 goto out;
3988 offset = 0;
3989 towrite -= tocopy;
3990 data += tocopy;
3991 blk++;
3992 }
3993 out:
3994 if (len == towrite) {
3995 mutex_unlock(&inode->i_mutex);
3996 return err;
3997 }
3998 if (inode->i_size < off+len-towrite) {
3999 i_size_write(inode, off+len-towrite);
4000 EXT4_I(inode)->i_disksize = inode->i_size;
4001 }
4002 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4003 ext4_mark_inode_dirty(handle, inode);
4004 mutex_unlock(&inode->i_mutex);
4005 return len - towrite;
4006 }
4007
4008 #endif
4009
4010 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
4011 const char *dev_name, void *data, struct vfsmount *mnt)
4012 {
4013 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
4014 }
4015
4016 #if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4017 static struct file_system_type ext2_fs_type = {
4018 .owner = THIS_MODULE,
4019 .name = "ext2",
4020 .get_sb = ext4_get_sb,
4021 .kill_sb = kill_block_super,
4022 .fs_flags = FS_REQUIRES_DEV,
4023 };
4024
4025 static inline void register_as_ext2(void)
4026 {
4027 int err = register_filesystem(&ext2_fs_type);
4028 if (err)
4029 printk(KERN_WARNING
4030 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4031 }
4032
4033 static inline void unregister_as_ext2(void)
4034 {
4035 unregister_filesystem(&ext2_fs_type);
4036 }
4037 MODULE_ALIAS("ext2");
4038 #else
4039 static inline void register_as_ext2(void) { }
4040 static inline void unregister_as_ext2(void) { }
4041 #endif
4042
4043 #if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4044 static struct file_system_type ext3_fs_type = {
4045 .owner = THIS_MODULE,
4046 .name = "ext3",
4047 .get_sb = ext4_get_sb,
4048 .kill_sb = kill_block_super,
4049 .fs_flags = FS_REQUIRES_DEV,
4050 };
4051
4052 static inline void register_as_ext3(void)
4053 {
4054 int err = register_filesystem(&ext3_fs_type);
4055 if (err)
4056 printk(KERN_WARNING
4057 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4058 }
4059
4060 static inline void unregister_as_ext3(void)
4061 {
4062 unregister_filesystem(&ext3_fs_type);
4063 }
4064 MODULE_ALIAS("ext3");
4065 #else
4066 static inline void register_as_ext3(void) { }
4067 static inline void unregister_as_ext3(void) { }
4068 #endif
4069
4070 static struct file_system_type ext4_fs_type = {
4071 .owner = THIS_MODULE,
4072 .name = "ext4",
4073 .get_sb = ext4_get_sb,
4074 .kill_sb = kill_block_super,
4075 .fs_flags = FS_REQUIRES_DEV,
4076 };
4077
4078 static int __init init_ext4_fs(void)
4079 {
4080 int err;
4081
4082 err = init_ext4_system_zone();
4083 if (err)
4084 return err;
4085 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4086 if (!ext4_kset)
4087 goto out4;
4088 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4089 err = init_ext4_mballoc();
4090 if (err)
4091 goto out3;
4092
4093 err = init_ext4_xattr();
4094 if (err)
4095 goto out2;
4096 err = init_inodecache();
4097 if (err)
4098 goto out1;
4099 register_as_ext2();
4100 register_as_ext3();
4101 err = register_filesystem(&ext4_fs_type);
4102 if (err)
4103 goto out;
4104 return 0;
4105 out:
4106 unregister_as_ext2();
4107 unregister_as_ext3();
4108 destroy_inodecache();
4109 out1:
4110 exit_ext4_xattr();
4111 out2:
4112 exit_ext4_mballoc();
4113 out3:
4114 remove_proc_entry("fs/ext4", NULL);
4115 kset_unregister(ext4_kset);
4116 out4:
4117 exit_ext4_system_zone();
4118 return err;
4119 }
4120
4121 static void __exit exit_ext4_fs(void)
4122 {
4123 unregister_as_ext2();
4124 unregister_as_ext3();
4125 unregister_filesystem(&ext4_fs_type);
4126 destroy_inodecache();
4127 exit_ext4_xattr();
4128 exit_ext4_mballoc();
4129 remove_proc_entry("fs/ext4", NULL);
4130 kset_unregister(ext4_kset);
4131 exit_ext4_system_zone();
4132 }
4133
4134 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4135 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4136 MODULE_LICENSE("GPL");
4137 module_init(init_ext4_fs)
4138 module_exit(exit_ext4_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree