?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ext4: Use ext4 file system driver for ext2/ext3 file system mounts
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blob30476daf966e8f2c98937c9dede3e8a2fa3dea0c
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, __func__,
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 ext4_release_system_zone(sb);
607 ext4_mb_release(sb);
608 ext4_ext_release(sb);
609 ext4_xattr_put_super(sb);
610 if (sbi->s_journal) {
611 err = jbd2_journal_destroy(sbi->s_journal);
612 sbi->s_journal = NULL;
613 if (err < 0)
614 ext4_abort(sb, __func__,
615 "Couldn't clean up the journal");
616 }
617 if (!(sb->s_flags & MS_RDONLY)) {
618 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
619 es->s_state = cpu_to_le16(sbi->s_mount_state);
620 ext4_commit_super(sb, 1);
621 }
622 if (sbi->s_proc) {
623 remove_proc_entry(sb->s_id, ext4_proc_root);
624 }
625 kobject_del(&sbi->s_kobj);
626
627 for (i = 0; i < sbi->s_gdb_count; i++)
628 brelse(sbi->s_group_desc[i]);
629 kfree(sbi->s_group_desc);
630 if (is_vmalloc_addr(sbi->s_flex_groups))
631 vfree(sbi->s_flex_groups);
632 else
633 kfree(sbi->s_flex_groups);
634 percpu_counter_destroy(&sbi->s_freeblocks_counter);
635 percpu_counter_destroy(&sbi->s_freeinodes_counter);
636 percpu_counter_destroy(&sbi->s_dirs_counter);
637 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
638 brelse(sbi->s_sbh);
639 #ifdef CONFIG_QUOTA
640 for (i = 0; i < MAXQUOTAS; i++)
641 kfree(sbi->s_qf_names[i]);
642 #endif
643
644 /* Debugging code just in case the in-memory inode orphan list
645 * isn't empty. The on-disk one can be non-empty if we've
646 * detected an error and taken the fs readonly, but the
647 * in-memory list had better be clean by this point. */
648 if (!list_empty(&sbi->s_orphan))
649 dump_orphan_list(sb, sbi);
650 J_ASSERT(list_empty(&sbi->s_orphan));
651
652 invalidate_bdev(sb->s_bdev);
653 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
654 /*
655 * Invalidate the journal device's buffers. We don't want them
656 * floating about in memory - the physical journal device may
657 * hotswapped, and it breaks the `ro-after' testing code.
658 */
659 sync_blockdev(sbi->journal_bdev);
660 invalidate_bdev(sbi->journal_bdev);
661 ext4_blkdev_remove(sbi);
662 }
663 sb->s_fs_info = NULL;
664 /*
665 * Now that we are completely done shutting down the
666 * superblock, we need to actually destroy the kobject.
667 */
668 unlock_kernel();
669 unlock_super(sb);
670 kobject_put(&sbi->s_kobj);
671 wait_for_completion(&sbi->s_kobj_unregister);
672 kfree(sbi->s_blockgroup_lock);
673 kfree(sbi);
674 }
675
676 static struct kmem_cache *ext4_inode_cachep;
677
678 /*
679 * Called inside transaction, so use GFP_NOFS
680 */
681 static struct inode *ext4_alloc_inode(struct super_block *sb)
682 {
683 struct ext4_inode_info *ei;
684
685 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
686 if (!ei)
687 return NULL;
688
689 ei->vfs_inode.i_version = 1;
690 ei->vfs_inode.i_data.writeback_index = 0;
691 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
692 INIT_LIST_HEAD(&ei->i_prealloc_list);
693 spin_lock_init(&ei->i_prealloc_lock);
694 /*
695 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
696 * therefore it can be null here. Don't check it, just initialize
697 * jinode.
698 */
699 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
700 ei->i_reserved_data_blocks = 0;
701 ei->i_reserved_meta_blocks = 0;
702 ei->i_allocated_meta_blocks = 0;
703 ei->i_delalloc_reserved_flag = 0;
704 spin_lock_init(&(ei->i_block_reservation_lock));
705 INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
706 ei->cur_aio_dio = NULL;
707
708 return &ei->vfs_inode;
709 }
710
711 static void ext4_destroy_inode(struct inode *inode)
712 {
713 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
714 ext4_msg(inode->i_sb, KERN_ERR,
715 "Inode %lu (%p): orphan list check failed!",
716 inode->i_ino, EXT4_I(inode));
717 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
718 EXT4_I(inode), sizeof(struct ext4_inode_info),
719 true);
720 dump_stack();
721 }
722 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
723 }
724
725 static void init_once(void *foo)
726 {
727 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
728
729 INIT_LIST_HEAD(&ei->i_orphan);
730 #ifdef CONFIG_EXT4_FS_XATTR
731 init_rwsem(&ei->xattr_sem);
732 #endif
733 init_rwsem(&ei->i_data_sem);
734 inode_init_once(&ei->vfs_inode);
735 }
736
737 static int init_inodecache(void)
738 {
739 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
740 sizeof(struct ext4_inode_info),
741 0, (SLAB_RECLAIM_ACCOUNT|
742 SLAB_MEM_SPREAD),
743 init_once);
744 if (ext4_inode_cachep == NULL)
745 return -ENOMEM;
746 return 0;
747 }
748
749 static void destroy_inodecache(void)
750 {
751 kmem_cache_destroy(ext4_inode_cachep);
752 }
753
754 static void ext4_clear_inode(struct inode *inode)
755 {
756 ext4_discard_preallocations(inode);
757 if (EXT4_JOURNAL(inode))
758 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
759 &EXT4_I(inode)->jinode);
760 }
761
762 static inline void ext4_show_quota_options(struct seq_file *seq,
763 struct super_block *sb)
764 {
765 #if defined(CONFIG_QUOTA)
766 struct ext4_sb_info *sbi = EXT4_SB(sb);
767
768 if (sbi->s_jquota_fmt)
769 seq_printf(seq, ",jqfmt=%s",
770 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
771
772 if (sbi->s_qf_names[USRQUOTA])
773 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
774
775 if (sbi->s_qf_names[GRPQUOTA])
776 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
777
778 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
779 seq_puts(seq, ",usrquota");
780
781 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
782 seq_puts(seq, ",grpquota");
783 #endif
784 }
785
786 /*
787 * Show an option if
788 * - it's set to a non-default value OR
789 * - if the per-sb default is different from the global default
790 */
791 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
792 {
793 int def_errors;
794 unsigned long def_mount_opts;
795 struct super_block *sb = vfs->mnt_sb;
796 struct ext4_sb_info *sbi = EXT4_SB(sb);
797 struct ext4_super_block *es = sbi->s_es;
798
799 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
800 def_errors = le16_to_cpu(es->s_errors);
801
802 if (sbi->s_sb_block != 1)
803 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
804 if (test_opt(sb, MINIX_DF))
805 seq_puts(seq, ",minixdf");
806 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
807 seq_puts(seq, ",grpid");
808 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
809 seq_puts(seq, ",nogrpid");
810 if (sbi->s_resuid != EXT4_DEF_RESUID ||
811 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
812 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
813 }
814 if (sbi->s_resgid != EXT4_DEF_RESGID ||
815 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
816 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
817 }
818 if (test_opt(sb, ERRORS_RO)) {
819 if (def_errors == EXT4_ERRORS_PANIC ||
820 def_errors == EXT4_ERRORS_CONTINUE) {
821 seq_puts(seq, ",errors=remount-ro");
822 }
823 }
824 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
825 seq_puts(seq, ",errors=continue");
826 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
827 seq_puts(seq, ",errors=panic");
828 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
829 seq_puts(seq, ",nouid32");
830 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
831 seq_puts(seq, ",debug");
832 if (test_opt(sb, OLDALLOC))
833 seq_puts(seq, ",oldalloc");
834 #ifdef CONFIG_EXT4_FS_XATTR
835 if (test_opt(sb, XATTR_USER) &&
836 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
837 seq_puts(seq, ",user_xattr");
838 if (!test_opt(sb, XATTR_USER) &&
839 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
840 seq_puts(seq, ",nouser_xattr");
841 }
842 #endif
843 #ifdef CONFIG_EXT4_FS_POSIX_ACL
844 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
845 seq_puts(seq, ",acl");
846 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
847 seq_puts(seq, ",noacl");
848 #endif
849 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
850 seq_printf(seq, ",commit=%u",
851 (unsigned) (sbi->s_commit_interval / HZ));
852 }
853 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
854 seq_printf(seq, ",min_batch_time=%u",
855 (unsigned) sbi->s_min_batch_time);
856 }
857 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
858 seq_printf(seq, ",max_batch_time=%u",
859 (unsigned) sbi->s_min_batch_time);
860 }
861
862 /*
863 * We're changing the default of barrier mount option, so
864 * let's always display its mount state so it's clear what its
865 * status is.
866 */
867 seq_puts(seq, ",barrier=");
868 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
869 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
870 seq_puts(seq, ",journal_async_commit");
871 if (test_opt(sb, NOBH))
872 seq_puts(seq, ",nobh");
873 if (test_opt(sb, I_VERSION))
874 seq_puts(seq, ",i_version");
875 if (!test_opt(sb, DELALLOC))
876 seq_puts(seq, ",nodelalloc");
877
878
879 if (sbi->s_stripe)
880 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
881 /*
882 * journal mode get enabled in different ways
883 * So just print the value even if we didn't specify it
884 */
885 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
886 seq_puts(seq, ",data=journal");
887 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
888 seq_puts(seq, ",data=ordered");
889 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
890 seq_puts(seq, ",data=writeback");
891
892 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
893 seq_printf(seq, ",inode_readahead_blks=%u",
894 sbi->s_inode_readahead_blks);
895
896 if (test_opt(sb, DATA_ERR_ABORT))
897 seq_puts(seq, ",data_err=abort");
898
899 if (test_opt(sb, NO_AUTO_DA_ALLOC))
900 seq_puts(seq, ",noauto_da_alloc");
901
902 if (test_opt(sb, DISCARD))
903 seq_puts(seq, ",discard");
904
905 if (test_opt(sb, NOLOAD))
906 seq_puts(seq, ",norecovery");
907
908 ext4_show_quota_options(seq, sb);
909
910 return 0;
911 }
912
913 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
914 u64 ino, u32 generation)
915 {
916 struct inode *inode;
917
918 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
919 return ERR_PTR(-ESTALE);
920 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
921 return ERR_PTR(-ESTALE);
922
923 /* iget isn't really right if the inode is currently unallocated!!
924 *
925 * ext4_read_inode will return a bad_inode if the inode had been
926 * deleted, so we should be safe.
927 *
928 * Currently we don't know the generation for parent directory, so
929 * a generation of 0 means "accept any"
930 */
931 inode = ext4_iget(sb, ino);
932 if (IS_ERR(inode))
933 return ERR_CAST(inode);
934 if (generation && inode->i_generation != generation) {
935 iput(inode);
936 return ERR_PTR(-ESTALE);
937 }
938
939 return inode;
940 }
941
942 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
943 int fh_len, int fh_type)
944 {
945 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
946 ext4_nfs_get_inode);
947 }
948
949 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
950 int fh_len, int fh_type)
951 {
952 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
953 ext4_nfs_get_inode);
954 }
955
956 /*
957 * Try to release metadata pages (indirect blocks, directories) which are
958 * mapped via the block device. Since these pages could have journal heads
959 * which would prevent try_to_free_buffers() from freeing them, we must use
960 * jbd2 layer's try_to_free_buffers() function to release them.
961 */
962 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
963 gfp_t wait)
964 {
965 journal_t *journal = EXT4_SB(sb)->s_journal;
966
967 WARN_ON(PageChecked(page));
968 if (!page_has_buffers(page))
969 return 0;
970 if (journal)
971 return jbd2_journal_try_to_free_buffers(journal, page,
972 wait & ~__GFP_WAIT);
973 return try_to_free_buffers(page);
974 }
975
976 #ifdef CONFIG_QUOTA
977 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
978 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
979
980 static int ext4_write_dquot(struct dquot *dquot);
981 static int ext4_acquire_dquot(struct dquot *dquot);
982 static int ext4_release_dquot(struct dquot *dquot);
983 static int ext4_mark_dquot_dirty(struct dquot *dquot);
984 static int ext4_write_info(struct super_block *sb, int type);
985 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
986 char *path, int remount);
987 static int ext4_quota_on_mount(struct super_block *sb, int type);
988 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
989 size_t len, loff_t off);
990 static ssize_t ext4_quota_write(struct super_block *sb, int type,
991 const char *data, size_t len, loff_t off);
992
993 static const struct dquot_operations ext4_quota_operations = {
994 .initialize = dquot_initialize,
995 .drop = dquot_drop,
996 .alloc_space = dquot_alloc_space,
997 .reserve_space = dquot_reserve_space,
998 .claim_space = dquot_claim_space,
999 .release_rsv = dquot_release_reserved_space,
1000 .get_reserved_space = ext4_get_reserved_space,
1001 .alloc_inode = dquot_alloc_inode,
1002 .free_space = dquot_free_space,
1003 .free_inode = dquot_free_inode,
1004 .transfer = dquot_transfer,
1005 .write_dquot = ext4_write_dquot,
1006 .acquire_dquot = ext4_acquire_dquot,
1007 .release_dquot = ext4_release_dquot,
1008 .mark_dirty = ext4_mark_dquot_dirty,
1009 .write_info = ext4_write_info,
1010 .alloc_dquot = dquot_alloc,
1011 .destroy_dquot = dquot_destroy,
1012 };
1013
1014 static const struct quotactl_ops ext4_qctl_operations = {
1015 .quota_on = ext4_quota_on,
1016 .quota_off = vfs_quota_off,
1017 .quota_sync = vfs_quota_sync,
1018 .get_info = vfs_get_dqinfo,
1019 .set_info = vfs_set_dqinfo,
1020 .get_dqblk = vfs_get_dqblk,
1021 .set_dqblk = vfs_set_dqblk
1022 };
1023 #endif
1024
1025 static const struct super_operations ext4_sops = {
1026 .alloc_inode = ext4_alloc_inode,
1027 .destroy_inode = ext4_destroy_inode,
1028 .write_inode = ext4_write_inode,
1029 .dirty_inode = ext4_dirty_inode,
1030 .delete_inode = ext4_delete_inode,
1031 .put_super = ext4_put_super,
1032 .sync_fs = ext4_sync_fs,
1033 .freeze_fs = ext4_freeze,
1034 .unfreeze_fs = ext4_unfreeze,
1035 .statfs = ext4_statfs,
1036 .remount_fs = ext4_remount,
1037 .clear_inode = ext4_clear_inode,
1038 .show_options = ext4_show_options,
1039 #ifdef CONFIG_QUOTA
1040 .quota_read = ext4_quota_read,
1041 .quota_write = ext4_quota_write,
1042 #endif
1043 .bdev_try_to_free_page = bdev_try_to_free_page,
1044 };
1045
1046 static const struct super_operations ext4_nojournal_sops = {
1047 .alloc_inode = ext4_alloc_inode,
1048 .destroy_inode = ext4_destroy_inode,
1049 .write_inode = ext4_write_inode,
1050 .dirty_inode = ext4_dirty_inode,
1051 .delete_inode = ext4_delete_inode,
1052 .write_super = ext4_write_super,
1053 .put_super = ext4_put_super,
1054 .statfs = ext4_statfs,
1055 .remount_fs = ext4_remount,
1056 .clear_inode = ext4_clear_inode,
1057 .show_options = ext4_show_options,
1058 #ifdef CONFIG_QUOTA
1059 .quota_read = ext4_quota_read,
1060 .quota_write = ext4_quota_write,
1061 #endif
1062 .bdev_try_to_free_page = bdev_try_to_free_page,
1063 };
1064
1065 static const struct export_operations ext4_export_ops = {
1066 .fh_to_dentry = ext4_fh_to_dentry,
1067 .fh_to_parent = ext4_fh_to_parent,
1068 .get_parent = ext4_get_parent,
1069 };
1070
1071 enum {
1072 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1073 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1074 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1075 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1076 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1077 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1078 Opt_journal_update, Opt_journal_dev,
1079 Opt_journal_checksum, Opt_journal_async_commit,
1080 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1081 Opt_data_err_abort, Opt_data_err_ignore,
1082 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1083 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1084 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1085 Opt_usrquota, Opt_grpquota, Opt_i_version,
1086 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1087 Opt_block_validity, Opt_noblock_validity,
1088 Opt_inode_readahead_blks, Opt_journal_ioprio,
1089 Opt_discard, Opt_nodiscard,
1090 };
1091
1092 static const match_table_t tokens = {
1093 {Opt_bsd_df, "bsddf"},
1094 {Opt_minix_df, "minixdf"},
1095 {Opt_grpid, "grpid"},
1096 {Opt_grpid, "bsdgroups"},
1097 {Opt_nogrpid, "nogrpid"},
1098 {Opt_nogrpid, "sysvgroups"},
1099 {Opt_resgid, "resgid=%u"},
1100 {Opt_resuid, "resuid=%u"},
1101 {Opt_sb, "sb=%u"},
1102 {Opt_err_cont, "errors=continue"},
1103 {Opt_err_panic, "errors=panic"},
1104 {Opt_err_ro, "errors=remount-ro"},
1105 {Opt_nouid32, "nouid32"},
1106 {Opt_debug, "debug"},
1107 {Opt_oldalloc, "oldalloc"},
1108 {Opt_orlov, "orlov"},
1109 {Opt_user_xattr, "user_xattr"},
1110 {Opt_nouser_xattr, "nouser_xattr"},
1111 {Opt_acl, "acl"},
1112 {Opt_noacl, "noacl"},
1113 {Opt_noload, "noload"},
1114 {Opt_noload, "norecovery"},
1115 {Opt_nobh, "nobh"},
1116 {Opt_bh, "bh"},
1117 {Opt_commit, "commit=%u"},
1118 {Opt_min_batch_time, "min_batch_time=%u"},
1119 {Opt_max_batch_time, "max_batch_time=%u"},
1120 {Opt_journal_update, "journal=update"},
1121 {Opt_journal_dev, "journal_dev=%u"},
1122 {Opt_journal_checksum, "journal_checksum"},
1123 {Opt_journal_async_commit, "journal_async_commit"},
1124 {Opt_abort, "abort"},
1125 {Opt_data_journal, "data=journal"},
1126 {Opt_data_ordered, "data=ordered"},
1127 {Opt_data_writeback, "data=writeback"},
1128 {Opt_data_err_abort, "data_err=abort"},
1129 {Opt_data_err_ignore, "data_err=ignore"},
1130 {Opt_offusrjquota, "usrjquota="},
1131 {Opt_usrjquota, "usrjquota=%s"},
1132 {Opt_offgrpjquota, "grpjquota="},
1133 {Opt_grpjquota, "grpjquota=%s"},
1134 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1135 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1136 {Opt_grpquota, "grpquota"},
1137 {Opt_noquota, "noquota"},
1138 {Opt_quota, "quota"},
1139 {Opt_usrquota, "usrquota"},
1140 {Opt_barrier, "barrier=%u"},
1141 {Opt_barrier, "barrier"},
1142 {Opt_nobarrier, "nobarrier"},
1143 {Opt_i_version, "i_version"},
1144 {Opt_stripe, "stripe=%u"},
1145 {Opt_resize, "resize"},
1146 {Opt_delalloc, "delalloc"},
1147 {Opt_nodelalloc, "nodelalloc"},
1148 {Opt_block_validity, "block_validity"},
1149 {Opt_noblock_validity, "noblock_validity"},
1150 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1151 {Opt_journal_ioprio, "journal_ioprio=%u"},
1152 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1153 {Opt_auto_da_alloc, "auto_da_alloc"},
1154 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1155 {Opt_discard, "discard"},
1156 {Opt_nodiscard, "nodiscard"},
1157 {Opt_err, NULL},
1158 };
1159
1160 static ext4_fsblk_t get_sb_block(void **data)
1161 {
1162 ext4_fsblk_t sb_block;
1163 char *options = (char *) *data;
1164
1165 if (!options || strncmp(options, "sb=", 3) != 0)
1166 return 1; /* Default location */
1167
1168 options += 3;
1169 /* TODO: use simple_strtoll with >32bit ext4 */
1170 sb_block = simple_strtoul(options, &options, 0);
1171 if (*options && *options != ',') {
1172 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1173 (char *) *data);
1174 return 1;
1175 }
1176 if (*options == ',')
1177 options++;
1178 *data = (void *) options;
1179
1180 return sb_block;
1181 }
1182
1183 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1184
1185 static int parse_options(char *options, struct super_block *sb,
1186 unsigned long *journal_devnum,
1187 unsigned int *journal_ioprio,
1188 ext4_fsblk_t *n_blocks_count, int is_remount)
1189 {
1190 struct ext4_sb_info *sbi = EXT4_SB(sb);
1191 char *p;
1192 substring_t args[MAX_OPT_ARGS];
1193 int data_opt = 0;
1194 int option;
1195 #ifdef CONFIG_QUOTA
1196 int qtype, qfmt;
1197 char *qname;
1198 #endif
1199
1200 if (!options)
1201 return 1;
1202
1203 while ((p = strsep(&options, ",")) != NULL) {
1204 int token;
1205 if (!*p)
1206 continue;
1207
1208 token = match_token(p, tokens, args);
1209 switch (token) {
1210 case Opt_bsd_df:
1211 clear_opt(sbi->s_mount_opt, MINIX_DF);
1212 break;
1213 case Opt_minix_df:
1214 set_opt(sbi->s_mount_opt, MINIX_DF);
1215 break;
1216 case Opt_grpid:
1217 set_opt(sbi->s_mount_opt, GRPID);
1218 break;
1219 case Opt_nogrpid:
1220 clear_opt(sbi->s_mount_opt, GRPID);
1221 break;
1222 case Opt_resuid:
1223 if (match_int(&args[0], &option))
1224 return 0;
1225 sbi->s_resuid = option;
1226 break;
1227 case Opt_resgid:
1228 if (match_int(&args[0], &option))
1229 return 0;
1230 sbi->s_resgid = option;
1231 break;
1232 case Opt_sb:
1233 /* handled by get_sb_block() instead of here */
1234 /* *sb_block = match_int(&args[0]); */
1235 break;
1236 case Opt_err_panic:
1237 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1238 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1239 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1240 break;
1241 case Opt_err_ro:
1242 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1243 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1244 set_opt(sbi->s_mount_opt, ERRORS_RO);
1245 break;
1246 case Opt_err_cont:
1247 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1248 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1249 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1250 break;
1251 case Opt_nouid32:
1252 set_opt(sbi->s_mount_opt, NO_UID32);
1253 break;
1254 case Opt_debug:
1255 set_opt(sbi->s_mount_opt, DEBUG);
1256 break;
1257 case Opt_oldalloc:
1258 set_opt(sbi->s_mount_opt, OLDALLOC);
1259 break;
1260 case Opt_orlov:
1261 clear_opt(sbi->s_mount_opt, OLDALLOC);
1262 break;
1263 #ifdef CONFIG_EXT4_FS_XATTR
1264 case Opt_user_xattr:
1265 set_opt(sbi->s_mount_opt, XATTR_USER);
1266 break;
1267 case Opt_nouser_xattr:
1268 clear_opt(sbi->s_mount_opt, XATTR_USER);
1269 break;
1270 #else
1271 case Opt_user_xattr:
1272 case Opt_nouser_xattr:
1273 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1274 break;
1275 #endif
1276 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1277 case Opt_acl:
1278 set_opt(sbi->s_mount_opt, POSIX_ACL);
1279 break;
1280 case Opt_noacl:
1281 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1282 break;
1283 #else
1284 case Opt_acl:
1285 case Opt_noacl:
1286 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1287 break;
1288 #endif
1289 case Opt_journal_update:
1290 /* @@@ FIXME */
1291 /* Eventually we will want to be able to create
1292 a journal file here. For now, only allow the
1293 user to specify an existing inode to be the
1294 journal file. */
1295 if (is_remount) {
1296 ext4_msg(sb, KERN_ERR,
1297 "Cannot specify journal on remount");
1298 return 0;
1299 }
1300 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1301 break;
1302 case Opt_journal_dev:
1303 if (is_remount) {
1304 ext4_msg(sb, KERN_ERR,
1305 "Cannot specify journal on remount");
1306 return 0;
1307 }
1308 if (match_int(&args[0], &option))
1309 return 0;
1310 *journal_devnum = option;
1311 break;
1312 case Opt_journal_checksum:
1313 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1314 break;
1315 case Opt_journal_async_commit:
1316 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1317 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1318 break;
1319 case Opt_noload:
1320 set_opt(sbi->s_mount_opt, NOLOAD);
1321 break;
1322 case Opt_commit:
1323 if (match_int(&args[0], &option))
1324 return 0;
1325 if (option < 0)
1326 return 0;
1327 if (option == 0)
1328 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1329 sbi->s_commit_interval = HZ * option;
1330 break;
1331 case Opt_max_batch_time:
1332 if (match_int(&args[0], &option))
1333 return 0;
1334 if (option < 0)
1335 return 0;
1336 if (option == 0)
1337 option = EXT4_DEF_MAX_BATCH_TIME;
1338 sbi->s_max_batch_time = option;
1339 break;
1340 case Opt_min_batch_time:
1341 if (match_int(&args[0], &option))
1342 return 0;
1343 if (option < 0)
1344 return 0;
1345 sbi->s_min_batch_time = option;
1346 break;
1347 case Opt_data_journal:
1348 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1349 goto datacheck;
1350 case Opt_data_ordered:
1351 data_opt = EXT4_MOUNT_ORDERED_DATA;
1352 goto datacheck;
1353 case Opt_data_writeback:
1354 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1355 datacheck:
1356 if (is_remount) {
1357 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1358 != data_opt) {
1359 ext4_msg(sb, KERN_ERR,
1360 "Cannot change data mode on remount");
1361 return 0;
1362 }
1363 } else {
1364 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1365 sbi->s_mount_opt |= data_opt;
1366 }
1367 break;
1368 case Opt_data_err_abort:
1369 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1370 break;
1371 case Opt_data_err_ignore:
1372 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1373 break;
1374 #ifdef CONFIG_QUOTA
1375 case Opt_usrjquota:
1376 qtype = USRQUOTA;
1377 goto set_qf_name;
1378 case Opt_grpjquota:
1379 qtype = GRPQUOTA;
1380 set_qf_name:
1381 if (sb_any_quota_loaded(sb) &&
1382 !sbi->s_qf_names[qtype]) {
1383 ext4_msg(sb, KERN_ERR,
1384 "Cannot change journaled "
1385 "quota options when quota turned on");
1386 return 0;
1387 }
1388 qname = match_strdup(&args[0]);
1389 if (!qname) {
1390 ext4_msg(sb, KERN_ERR,
1391 "Not enough memory for "
1392 "storing quotafile name");
1393 return 0;
1394 }
1395 if (sbi->s_qf_names[qtype] &&
1396 strcmp(sbi->s_qf_names[qtype], qname)) {
1397 ext4_msg(sb, KERN_ERR,
1398 "%s quota file already "
1399 "specified", QTYPE2NAME(qtype));
1400 kfree(qname);
1401 return 0;
1402 }
1403 sbi->s_qf_names[qtype] = qname;
1404 if (strchr(sbi->s_qf_names[qtype], '/')) {
1405 ext4_msg(sb, KERN_ERR,
1406 "quotafile must be on "
1407 "filesystem root");
1408 kfree(sbi->s_qf_names[qtype]);
1409 sbi->s_qf_names[qtype] = NULL;
1410 return 0;
1411 }
1412 set_opt(sbi->s_mount_opt, QUOTA);
1413 break;
1414 case Opt_offusrjquota:
1415 qtype = USRQUOTA;
1416 goto clear_qf_name;
1417 case Opt_offgrpjquota:
1418 qtype = GRPQUOTA;
1419 clear_qf_name:
1420 if (sb_any_quota_loaded(sb) &&
1421 sbi->s_qf_names[qtype]) {
1422 ext4_msg(sb, KERN_ERR, "Cannot change "
1423 "journaled quota options when "
1424 "quota turned on");
1425 return 0;
1426 }
1427 /*
1428 * The space will be released later when all options
1429 * are confirmed to be correct
1430 */
1431 sbi->s_qf_names[qtype] = NULL;
1432 break;
1433 case Opt_jqfmt_vfsold:
1434 qfmt = QFMT_VFS_OLD;
1435 goto set_qf_format;
1436 case Opt_jqfmt_vfsv0:
1437 qfmt = QFMT_VFS_V0;
1438 set_qf_format:
1439 if (sb_any_quota_loaded(sb) &&
1440 sbi->s_jquota_fmt != qfmt) {
1441 ext4_msg(sb, KERN_ERR, "Cannot change "
1442 "journaled quota options when "
1443 "quota turned on");
1444 return 0;
1445 }
1446 sbi->s_jquota_fmt = qfmt;
1447 break;
1448 case Opt_quota:
1449 case Opt_usrquota:
1450 set_opt(sbi->s_mount_opt, QUOTA);
1451 set_opt(sbi->s_mount_opt, USRQUOTA);
1452 break;
1453 case Opt_grpquota:
1454 set_opt(sbi->s_mount_opt, QUOTA);
1455 set_opt(sbi->s_mount_opt, GRPQUOTA);
1456 break;
1457 case Opt_noquota:
1458 if (sb_any_quota_loaded(sb)) {
1459 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1460 "options when quota turned on");
1461 return 0;
1462 }
1463 clear_opt(sbi->s_mount_opt, QUOTA);
1464 clear_opt(sbi->s_mount_opt, USRQUOTA);
1465 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1466 break;
1467 #else
1468 case Opt_quota:
1469 case Opt_usrquota:
1470 case Opt_grpquota:
1471 ext4_msg(sb, KERN_ERR,
1472 "quota options not supported");
1473 break;
1474 case Opt_usrjquota:
1475 case Opt_grpjquota:
1476 case Opt_offusrjquota:
1477 case Opt_offgrpjquota:
1478 case Opt_jqfmt_vfsold:
1479 case Opt_jqfmt_vfsv0:
1480 ext4_msg(sb, KERN_ERR,
1481 "journaled quota options not supported");
1482 break;
1483 case Opt_noquota:
1484 break;
1485 #endif
1486 case Opt_abort:
1487 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1488 break;
1489 case Opt_nobarrier:
1490 clear_opt(sbi->s_mount_opt, BARRIER);
1491 break;
1492 case Opt_barrier:
1493 if (match_int(&args[0], &option)) {
1494 set_opt(sbi->s_mount_opt, BARRIER);
1495 break;
1496 }
1497 if (option)
1498 set_opt(sbi->s_mount_opt, BARRIER);
1499 else
1500 clear_opt(sbi->s_mount_opt, BARRIER);
1501 break;
1502 case Opt_ignore:
1503 break;
1504 case Opt_resize:
1505 if (!is_remount) {
1506 ext4_msg(sb, KERN_ERR,
1507 "resize option only available "
1508 "for remount");
1509 return 0;
1510 }
1511 if (match_int(&args[0], &option) != 0)
1512 return 0;
1513 *n_blocks_count = option;
1514 break;
1515 case Opt_nobh:
1516 set_opt(sbi->s_mount_opt, NOBH);
1517 break;
1518 case Opt_bh:
1519 clear_opt(sbi->s_mount_opt, NOBH);
1520 break;
1521 case Opt_i_version:
1522 set_opt(sbi->s_mount_opt, I_VERSION);
1523 sb->s_flags |= MS_I_VERSION;
1524 break;
1525 case Opt_nodelalloc:
1526 clear_opt(sbi->s_mount_opt, DELALLOC);
1527 break;
1528 case Opt_stripe:
1529 if (match_int(&args[0], &option))
1530 return 0;
1531 if (option < 0)
1532 return 0;
1533 sbi->s_stripe = option;
1534 break;
1535 case Opt_delalloc:
1536 set_opt(sbi->s_mount_opt, DELALLOC);
1537 break;
1538 case Opt_block_validity:
1539 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1540 break;
1541 case Opt_noblock_validity:
1542 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1543 break;
1544 case Opt_inode_readahead_blks:
1545 if (match_int(&args[0], &option))
1546 return 0;
1547 if (option < 0 || option > (1 << 30))
1548 return 0;
1549 if (!is_power_of_2(option)) {
1550 ext4_msg(sb, KERN_ERR,
1551 "EXT4-fs: inode_readahead_blks"
1552 " must be a power of 2");
1553 return 0;
1554 }
1555 sbi->s_inode_readahead_blks = option;
1556 break;
1557 case Opt_journal_ioprio:
1558 if (match_int(&args[0], &option))
1559 return 0;
1560 if (option < 0 || option > 7)
1561 break;
1562 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1563 option);
1564 break;
1565 case Opt_noauto_da_alloc:
1566 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1567 break;
1568 case Opt_auto_da_alloc:
1569 if (match_int(&args[0], &option)) {
1570 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1571 break;
1572 }
1573 if (option)
1574 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1575 else
1576 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1577 break;
1578 case Opt_discard:
1579 set_opt(sbi->s_mount_opt, DISCARD);
1580 break;
1581 case Opt_nodiscard:
1582 clear_opt(sbi->s_mount_opt, DISCARD);
1583 break;
1584 default:
1585 ext4_msg(sb, KERN_ERR,
1586 "Unrecognized mount option \"%s\" "
1587 "or missing value", p);
1588 return 0;
1589 }
1590 }
1591 #ifdef CONFIG_QUOTA
1592 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1593 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1594 sbi->s_qf_names[USRQUOTA])
1595 clear_opt(sbi->s_mount_opt, USRQUOTA);
1596
1597 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1598 sbi->s_qf_names[GRPQUOTA])
1599 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1600
1601 if ((sbi->s_qf_names[USRQUOTA] &&
1602 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1603 (sbi->s_qf_names[GRPQUOTA] &&
1604 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1605 ext4_msg(sb, KERN_ERR, "old and new quota "
1606 "format mixing");
1607 return 0;
1608 }
1609
1610 if (!sbi->s_jquota_fmt) {
1611 ext4_msg(sb, KERN_ERR, "journaled quota format "
1612 "not specified");
1613 return 0;
1614 }
1615 } else {
1616 if (sbi->s_jquota_fmt) {
1617 ext4_msg(sb, KERN_ERR, "journaled quota format "
1618 "specified with no journaling "
1619 "enabled");
1620 return 0;
1621 }
1622 }
1623 #endif
1624 return 1;
1625 }
1626
1627 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1628 int read_only)
1629 {
1630 struct ext4_sb_info *sbi = EXT4_SB(sb);
1631 int res = 0;
1632
1633 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1634 ext4_msg(sb, KERN_ERR, "revision level too high, "
1635 "forcing read-only mode");
1636 res = MS_RDONLY;
1637 }
1638 if (read_only)
1639 return res;
1640 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1641 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1642 "running e2fsck is recommended");
1643 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1644 ext4_msg(sb, KERN_WARNING,
1645 "warning: mounting fs with errors, "
1646 "running e2fsck is recommended");
1647 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1648 le16_to_cpu(es->s_mnt_count) >=
1649 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1650 ext4_msg(sb, KERN_WARNING,
1651 "warning: maximal mount count reached, "
1652 "running e2fsck is recommended");
1653 else if (le32_to_cpu(es->s_checkinterval) &&
1654 (le32_to_cpu(es->s_lastcheck) +
1655 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1656 ext4_msg(sb, KERN_WARNING,
1657 "warning: checktime reached, "
1658 "running e2fsck is recommended");
1659 if (!sbi->s_journal)
1660 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1661 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1662 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1663 le16_add_cpu(&es->s_mnt_count, 1);
1664 es->s_mtime = cpu_to_le32(get_seconds());
1665 ext4_update_dynamic_rev(sb);
1666 if (sbi->s_journal)
1667 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1668
1669 ext4_commit_super(sb, 1);
1670 if (test_opt(sb, DEBUG))
1671 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1672 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1673 sb->s_blocksize,
1674 sbi->s_groups_count,
1675 EXT4_BLOCKS_PER_GROUP(sb),
1676 EXT4_INODES_PER_GROUP(sb),
1677 sbi->s_mount_opt);
1678
1679 return res;
1680 }
1681
1682 static int ext4_fill_flex_info(struct super_block *sb)
1683 {
1684 struct ext4_sb_info *sbi = EXT4_SB(sb);
1685 struct ext4_group_desc *gdp = NULL;
1686 ext4_group_t flex_group_count;
1687 ext4_group_t flex_group;
1688 int groups_per_flex = 0;
1689 size_t size;
1690 int i;
1691
1692 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1693 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1694
1695 if (groups_per_flex < 2) {
1696 sbi->s_log_groups_per_flex = 0;
1697 return 1;
1698 }
1699
1700 /* We allocate both existing and potentially added groups */
1701 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1702 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1703 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1704 size = flex_group_count * sizeof(struct flex_groups);
1705 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1706 if (sbi->s_flex_groups == NULL) {
1707 sbi->s_flex_groups = vmalloc(size);
1708 if (sbi->s_flex_groups)
1709 memset(sbi->s_flex_groups, 0, size);
1710 }
1711 if (sbi->s_flex_groups == NULL) {
1712 ext4_msg(sb, KERN_ERR, "not enough memory for "
1713 "%u flex groups", flex_group_count);
1714 goto failed;
1715 }
1716
1717 for (i = 0; i < sbi->s_groups_count; i++) {
1718 gdp = ext4_get_group_desc(sb, i, NULL);
1719
1720 flex_group = ext4_flex_group(sbi, i);
1721 atomic_add(ext4_free_inodes_count(sb, gdp),
1722 &sbi->s_flex_groups[flex_group].free_inodes);
1723 atomic_add(ext4_free_blks_count(sb, gdp),
1724 &sbi->s_flex_groups[flex_group].free_blocks);
1725 atomic_add(ext4_used_dirs_count(sb, gdp),
1726 &sbi->s_flex_groups[flex_group].used_dirs);
1727 }
1728
1729 return 1;
1730 failed:
1731 return 0;
1732 }
1733
1734 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1735 struct ext4_group_desc *gdp)
1736 {
1737 __u16 crc = 0;
1738
1739 if (sbi->s_es->s_feature_ro_compat &
1740 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1741 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1742 __le32 le_group = cpu_to_le32(block_group);
1743
1744 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1745 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1746 crc = crc16(crc, (__u8 *)gdp, offset);
1747 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1748 /* for checksum of struct ext4_group_desc do the rest...*/
1749 if ((sbi->s_es->s_feature_incompat &
1750 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1751 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1752 crc = crc16(crc, (__u8 *)gdp + offset,
1753 le16_to_cpu(sbi->s_es->s_desc_size) -
1754 offset);
1755 }
1756
1757 return cpu_to_le16(crc);
1758 }
1759
1760 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1761 struct ext4_group_desc *gdp)
1762 {
1763 if ((sbi->s_es->s_feature_ro_compat &
1764 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1765 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1766 return 0;
1767
1768 return 1;
1769 }
1770
1771 /* Called at mount-time, super-block is locked */
1772 static int ext4_check_descriptors(struct super_block *sb)
1773 {
1774 struct ext4_sb_info *sbi = EXT4_SB(sb);
1775 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1776 ext4_fsblk_t last_block;
1777 ext4_fsblk_t block_bitmap;
1778 ext4_fsblk_t inode_bitmap;
1779 ext4_fsblk_t inode_table;
1780 int flexbg_flag = 0;
1781 ext4_group_t i;
1782
1783 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1784 flexbg_flag = 1;
1785
1786 ext4_debug("Checking group descriptors");
1787
1788 for (i = 0; i < sbi->s_groups_count; i++) {
1789 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1790
1791 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1792 last_block = ext4_blocks_count(sbi->s_es) - 1;
1793 else
1794 last_block = first_block +
1795 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1796
1797 block_bitmap = ext4_block_bitmap(sb, gdp);
1798 if (block_bitmap < first_block || block_bitmap > last_block) {
1799 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1800 "Block bitmap for group %u not in group "
1801 "(block %llu)!", i, block_bitmap);
1802 return 0;
1803 }
1804 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1805 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1806 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1807 "Inode bitmap for group %u not in group "
1808 "(block %llu)!", i, inode_bitmap);
1809 return 0;
1810 }
1811 inode_table = ext4_inode_table(sb, gdp);
1812 if (inode_table < first_block ||
1813 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1814 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1815 "Inode table for group %u not in group "
1816 "(block %llu)!", i, inode_table);
1817 return 0;
1818 }
1819 ext4_lock_group(sb, i);
1820 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1821 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1822 "Checksum for group %u failed (%u!=%u)",
1823 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1824 gdp)), le16_to_cpu(gdp->bg_checksum));
1825 if (!(sb->s_flags & MS_RDONLY)) {
1826 ext4_unlock_group(sb, i);
1827 return 0;
1828 }
1829 }
1830 ext4_unlock_group(sb, i);
1831 if (!flexbg_flag)
1832 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1833 }
1834
1835 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1836 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
1837 return 1;
1838 }
1839
1840 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1841 * the superblock) which were deleted from all directories, but held open by
1842 * a process at the time of a crash. We walk the list and try to delete these
1843 * inodes at recovery time (only with a read-write filesystem).
1844 *
1845 * In order to keep the orphan inode chain consistent during traversal (in
1846 * case of crash during recovery), we link each inode into the superblock
1847 * orphan list_head and handle it the same way as an inode deletion during
1848 * normal operation (which journals the operations for us).
1849 *
1850 * We only do an iget() and an iput() on each inode, which is very safe if we
1851 * accidentally point at an in-use or already deleted inode. The worst that
1852 * can happen in this case is that we get a "bit already cleared" message from
1853 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1854 * e2fsck was run on this filesystem, and it must have already done the orphan
1855 * inode cleanup for us, so we can safely abort without any further action.
1856 */
1857 static void ext4_orphan_cleanup(struct super_block *sb,
1858 struct ext4_super_block *es)
1859 {
1860 unsigned int s_flags = sb->s_flags;
1861 int nr_orphans = 0, nr_truncates = 0;
1862 #ifdef CONFIG_QUOTA
1863 int i;
1864 #endif
1865 if (!es->s_last_orphan) {
1866 jbd_debug(4, "no orphan inodes to clean up\n");
1867 return;
1868 }
1869
1870 if (bdev_read_only(sb->s_bdev)) {
1871 ext4_msg(sb, KERN_ERR, "write access "
1872 "unavailable, skipping orphan cleanup");
1873 return;
1874 }
1875
1876 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1877 if (es->s_last_orphan)
1878 jbd_debug(1, "Errors on filesystem, "
1879 "clearing orphan list.\n");
1880 es->s_last_orphan = 0;
1881 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1882 return;
1883 }
1884
1885 if (s_flags & MS_RDONLY) {
1886 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1887 sb->s_flags &= ~MS_RDONLY;
1888 }
1889 #ifdef CONFIG_QUOTA
1890 /* Needed for iput() to work correctly and not trash data */
1891 sb->s_flags |= MS_ACTIVE;
1892 /* Turn on quotas so that they are updated correctly */
1893 for (i = 0; i < MAXQUOTAS; i++) {
1894 if (EXT4_SB(sb)->s_qf_names[i]) {
1895 int ret = ext4_quota_on_mount(sb, i);
1896 if (ret < 0)
1897 ext4_msg(sb, KERN_ERR,
1898 "Cannot turn on journaled "
1899 "quota: error %d", ret);
1900 }
1901 }
1902 #endif
1903
1904 while (es->s_last_orphan) {
1905 struct inode *inode;
1906
1907 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1908 if (IS_ERR(inode)) {
1909 es->s_last_orphan = 0;
1910 break;
1911 }
1912
1913 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1914 vfs_dq_init(inode);
1915 if (inode->i_nlink) {
1916 ext4_msg(sb, KERN_DEBUG,
1917 "%s: truncating inode %lu to %lld bytes",
1918 __func__, inode->i_ino, inode->i_size);
1919 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1920 inode->i_ino, inode->i_size);
1921 ext4_truncate(inode);
1922 nr_truncates++;
1923 } else {
1924 ext4_msg(sb, KERN_DEBUG,
1925 "%s: deleting unreferenced inode %lu",
1926 __func__, inode->i_ino);
1927 jbd_debug(2, "deleting unreferenced inode %lu\n",
1928 inode->i_ino);
1929 nr_orphans++;
1930 }
1931 iput(inode); /* The delete magic happens here! */
1932 }
1933
1934 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1935
1936 if (nr_orphans)
1937 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1938 PLURAL(nr_orphans));
1939 if (nr_truncates)
1940 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1941 PLURAL(nr_truncates));
1942 #ifdef CONFIG_QUOTA
1943 /* Turn quotas off */
1944 for (i = 0; i < MAXQUOTAS; i++) {
1945 if (sb_dqopt(sb)->files[i])
1946 vfs_quota_off(sb, i, 0);
1947 }
1948 #endif
1949 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1950 }
1951
1952 /*
1953 * Maximal extent format file size.
1954 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1955 * extent format containers, within a sector_t, and within i_blocks
1956 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1957 * so that won't be a limiting factor.
1958 *
1959 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1960 */
1961 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1962 {
1963 loff_t res;
1964 loff_t upper_limit = MAX_LFS_FILESIZE;
1965
1966 /* small i_blocks in vfs inode? */
1967 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1968 /*
1969 * CONFIG_LBDAF is not enabled implies the inode
1970 * i_block represent total blocks in 512 bytes
1971 * 32 == size of vfs inode i_blocks * 8
1972 */
1973 upper_limit = (1LL << 32) - 1;
1974
1975 /* total blocks in file system block size */
1976 upper_limit >>= (blkbits - 9);
1977 upper_limit <<= blkbits;
1978 }
1979
1980 /* 32-bit extent-start container, ee_block */
1981 res = 1LL << 32;
1982 res <<= blkbits;
1983 res -= 1;
1984
1985 /* Sanity check against vm- & vfs- imposed limits */
1986 if (res > upper_limit)
1987 res = upper_limit;
1988
1989 return res;
1990 }
1991
1992 /*
1993 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1994 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1995 * We need to be 1 filesystem block less than the 2^48 sector limit.
1996 */
1997 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
1998 {
1999 loff_t res = EXT4_NDIR_BLOCKS;
2000 int meta_blocks;
2001 loff_t upper_limit;
2002 /* This is calculated to be the largest file size for a dense, block
2003 * mapped file such that the file's total number of 512-byte sectors,
2004 * including data and all indirect blocks, does not exceed (2^48 - 1).
2005 *
2006 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2007 * number of 512-byte sectors of the file.
2008 */
2009
2010 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2011 /*
2012 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2013 * the inode i_block field represents total file blocks in
2014 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2015 */
2016 upper_limit = (1LL << 32) - 1;
2017
2018 /* total blocks in file system block size */
2019 upper_limit >>= (bits - 9);
2020
2021 } else {
2022 /*
2023 * We use 48 bit ext4_inode i_blocks
2024 * With EXT4_HUGE_FILE_FL set the i_blocks
2025 * represent total number of blocks in
2026 * file system block size
2027 */
2028 upper_limit = (1LL << 48) - 1;
2029
2030 }
2031
2032 /* indirect blocks */
2033 meta_blocks = 1;
2034 /* double indirect blocks */
2035 meta_blocks += 1 + (1LL << (bits-2));
2036 /* tripple indirect blocks */
2037 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2038
2039 upper_limit -= meta_blocks;
2040 upper_limit <<= bits;
2041
2042 res += 1LL << (bits-2);
2043 res += 1LL << (2*(bits-2));
2044 res += 1LL << (3*(bits-2));
2045 res <<= bits;
2046 if (res > upper_limit)
2047 res = upper_limit;
2048
2049 if (res > MAX_LFS_FILESIZE)
2050 res = MAX_LFS_FILESIZE;
2051
2052 return res;
2053 }
2054
2055 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2056 ext4_fsblk_t logical_sb_block, int nr)
2057 {
2058 struct ext4_sb_info *sbi = EXT4_SB(sb);
2059 ext4_group_t bg, first_meta_bg;
2060 int has_super = 0;
2061
2062 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2063
2064 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2065 nr < first_meta_bg)
2066 return logical_sb_block + nr + 1;
2067 bg = sbi->s_desc_per_block * nr;
2068 if (ext4_bg_has_super(sb, bg))
2069 has_super = 1;
2070
2071 return (has_super + ext4_group_first_block_no(sb, bg));
2072 }
2073
2074 /**
2075 * ext4_get_stripe_size: Get the stripe size.
2076 * @sbi: In memory super block info
2077 *
2078 * If we have specified it via mount option, then
2079 * use the mount option value. If the value specified at mount time is
2080 * greater than the blocks per group use the super block value.
2081 * If the super block value is greater than blocks per group return 0.
2082 * Allocator needs it be less than blocks per group.
2083 *
2084 */
2085 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2086 {
2087 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2088 unsigned long stripe_width =
2089 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2090
2091 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2092 return sbi->s_stripe;
2093
2094 if (stripe_width <= sbi->s_blocks_per_group)
2095 return stripe_width;
2096
2097 if (stride <= sbi->s_blocks_per_group)
2098 return stride;
2099
2100 return 0;
2101 }
2102
2103 /* sysfs supprt */
2104
2105 struct ext4_attr {
2106 struct attribute attr;
2107 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2108 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2109 const char *, size_t);
2110 int offset;
2111 };
2112
2113 static int parse_strtoul(const char *buf,
2114 unsigned long max, unsigned long *value)
2115 {
2116 char *endp;
2117
2118 while (*buf && isspace(*buf))
2119 buf++;
2120 *value = simple_strtoul(buf, &endp, 0);
2121 while (*endp && isspace(*endp))
2122 endp++;
2123 if (*endp || *value > max)
2124 return -EINVAL;
2125
2126 return 0;
2127 }
2128
2129 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2130 struct ext4_sb_info *sbi,
2131 char *buf)
2132 {
2133 return snprintf(buf, PAGE_SIZE, "%llu\n",
2134 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2135 }
2136
2137 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2138 struct ext4_sb_info *sbi, char *buf)
2139 {
2140 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2141
2142 return snprintf(buf, PAGE_SIZE, "%lu\n",
2143 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2144 sbi->s_sectors_written_start) >> 1);
2145 }
2146
2147 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2148 struct ext4_sb_info *sbi, char *buf)
2149 {
2150 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2151
2152 return snprintf(buf, PAGE_SIZE, "%llu\n",
2153 sbi->s_kbytes_written +
2154 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2155 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2156 }
2157
2158 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2159 struct ext4_sb_info *sbi,
2160 const char *buf, size_t count)
2161 {
2162 unsigned long t;
2163
2164 if (parse_strtoul(buf, 0x40000000, &t))
2165 return -EINVAL;
2166
2167 if (!is_power_of_2(t))
2168 return -EINVAL;
2169
2170 sbi->s_inode_readahead_blks = t;
2171 return count;
2172 }
2173
2174 static ssize_t sbi_ui_show(struct ext4_attr *a,
2175 struct ext4_sb_info *sbi, char *buf)
2176 {
2177 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2178
2179 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2180 }
2181
2182 static ssize_t sbi_ui_store(struct ext4_attr *a,
2183 struct ext4_sb_info *sbi,
2184 const char *buf, size_t count)
2185 {
2186 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2187 unsigned long t;
2188
2189 if (parse_strtoul(buf, 0xffffffff, &t))
2190 return -EINVAL;
2191 *ui = t;
2192 return count;
2193 }
2194
2195 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2196 static struct ext4_attr ext4_attr_##_name = { \
2197 .attr = {.name = __stringify(_name), .mode = _mode }, \
2198 .show = _show, \
2199 .store = _store, \
2200 .offset = offsetof(struct ext4_sb_info, _elname), \
2201 }
2202 #define EXT4_ATTR(name, mode, show, store) \
2203 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2204
2205 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2206 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2207 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2208 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2209 #define ATTR_LIST(name) &ext4_attr_##name.attr
2210
2211 EXT4_RO_ATTR(delayed_allocation_blocks);
2212 EXT4_RO_ATTR(session_write_kbytes);
2213 EXT4_RO_ATTR(lifetime_write_kbytes);
2214 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2215 inode_readahead_blks_store, s_inode_readahead_blks);
2216 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2217 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2218 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2219 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2220 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2221 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2222 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2223 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2224
2225 static struct attribute *ext4_attrs[] = {
2226 ATTR_LIST(delayed_allocation_blocks),
2227 ATTR_LIST(session_write_kbytes),
2228 ATTR_LIST(lifetime_write_kbytes),
2229 ATTR_LIST(inode_readahead_blks),
2230 ATTR_LIST(inode_goal),
2231 ATTR_LIST(mb_stats),
2232 ATTR_LIST(mb_max_to_scan),
2233 ATTR_LIST(mb_min_to_scan),
2234 ATTR_LIST(mb_order2_req),
2235 ATTR_LIST(mb_stream_req),
2236 ATTR_LIST(mb_group_prealloc),
2237 ATTR_LIST(max_writeback_mb_bump),
2238 NULL,
2239 };
2240
2241 static ssize_t ext4_attr_show(struct kobject *kobj,
2242 struct attribute *attr, char *buf)
2243 {
2244 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2245 s_kobj);
2246 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2247
2248 return a->show ? a->show(a, sbi, buf) : 0;
2249 }
2250
2251 static ssize_t ext4_attr_store(struct kobject *kobj,
2252 struct attribute *attr,
2253 const char *buf, size_t len)
2254 {
2255 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2256 s_kobj);
2257 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2258
2259 return a->store ? a->store(a, sbi, buf, len) : 0;
2260 }
2261
2262 static void ext4_sb_release(struct kobject *kobj)
2263 {
2264 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2265 s_kobj);
2266 complete(&sbi->s_kobj_unregister);
2267 }
2268
2269
2270 static struct sysfs_ops ext4_attr_ops = {
2271 .show = ext4_attr_show,
2272 .store = ext4_attr_store,
2273 };
2274
2275 static struct kobj_type ext4_ktype = {
2276 .default_attrs = ext4_attrs,
2277 .sysfs_ops = &ext4_attr_ops,
2278 .release = ext4_sb_release,
2279 };
2280
2281 /*
2282 * Check whether this filesystem can be mounted based on
2283 * the features present and the RDONLY/RDWR mount requested.
2284 * Returns 1 if this filesystem can be mounted as requested,
2285 * 0 if it cannot be.
2286 */
2287 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2288 {
2289 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2290 ext4_msg(sb, KERN_ERR,
2291 "Couldn't mount because of "
2292 "unsupported optional features (%x)",
2293 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2294 ~EXT4_FEATURE_INCOMPAT_SUPP));
2295 return 0;
2296 }
2297
2298 if (readonly)
2299 return 1;
2300
2301 /* Check that feature set is OK for a read-write mount */
2302 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2303 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2304 "unsupported optional features (%x)",
2305 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2306 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2307 return 0;
2308 }
2309 /*
2310 * Large file size enabled file system can only be mounted
2311 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2312 */
2313 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2314 if (sizeof(blkcnt_t) < sizeof(u64)) {
2315 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2316 "cannot be mounted RDWR without "
2317 "CONFIG_LBDAF");
2318 return 0;
2319 }
2320 }
2321 return 1;
2322 }
2323
2324 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2325 __releases(kernel_lock)
2326 __acquires(kernel_lock)
2327 {
2328 struct buffer_head *bh;
2329 struct ext4_super_block *es = NULL;
2330 struct ext4_sb_info *sbi;
2331 ext4_fsblk_t block;
2332 ext4_fsblk_t sb_block = get_sb_block(&data);
2333 ext4_fsblk_t logical_sb_block;
2334 unsigned long offset = 0;
2335 unsigned long journal_devnum = 0;
2336 unsigned long def_mount_opts;
2337 struct inode *root;
2338 char *cp;
2339 const char *descr;
2340 int ret = -EINVAL;
2341 int blocksize;
2342 unsigned int db_count;
2343 unsigned int i;
2344 int needs_recovery, has_huge_files;
2345 __u64 blocks_count;
2346 int err;
2347 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2348
2349 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2350 if (!sbi)
2351 return -ENOMEM;
2352
2353 sbi->s_blockgroup_lock =
2354 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2355 if (!sbi->s_blockgroup_lock) {
2356 kfree(sbi);
2357 return -ENOMEM;
2358 }
2359 sb->s_fs_info = sbi;
2360 sbi->s_mount_opt = 0;
2361 sbi->s_resuid = EXT4_DEF_RESUID;
2362 sbi->s_resgid = EXT4_DEF_RESGID;
2363 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2364 sbi->s_sb_block = sb_block;
2365 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2366 sectors[1]);
2367
2368 unlock_kernel();
2369
2370 /* Cleanup superblock name */
2371 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2372 *cp = '!';
2373
2374 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2375 if (!blocksize) {
2376 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
2377 goto out_fail;
2378 }
2379
2380 /*
2381 * The ext4 superblock will not be buffer aligned for other than 1kB
2382 * block sizes. We need to calculate the offset from buffer start.
2383 */
2384 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2385 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2386 offset = do_div(logical_sb_block, blocksize);
2387 } else {
2388 logical_sb_block = sb_block;
2389 }
2390
2391 if (!(bh = sb_bread(sb, logical_sb_block))) {
2392 ext4_msg(sb, KERN_ERR, "unable to read superblock");
2393 goto out_fail;
2394 }
2395 /*
2396 * Note: s_es must be initialized as soon as possible because
2397 * some ext4 macro-instructions depend on its value
2398 */
2399 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2400 sbi->s_es = es;
2401 sb->s_magic = le16_to_cpu(es->s_magic);
2402 if (sb->s_magic != EXT4_SUPER_MAGIC)
2403 goto cantfind_ext4;
2404 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2405
2406 /* Set defaults before we parse the mount options */
2407 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2408 if (def_mount_opts & EXT4_DEFM_DEBUG)
2409 set_opt(sbi->s_mount_opt, DEBUG);
2410 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
2411 set_opt(sbi->s_mount_opt, GRPID);
2412 if (def_mount_opts & EXT4_DEFM_UID16)
2413 set_opt(sbi->s_mount_opt, NO_UID32);
2414 #ifdef CONFIG_EXT4_FS_XATTR
2415 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2416 set_opt(sbi->s_mount_opt, XATTR_USER);
2417 #endif
2418 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2419 if (def_mount_opts & EXT4_DEFM_ACL)
2420 set_opt(sbi->s_mount_opt, POSIX_ACL);
2421 #endif
2422 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2423 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2424 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2425 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2426 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2427 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2428
2429 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2430 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2431 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2432 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2433 else
2434 set_opt(sbi->s_mount_opt, ERRORS_RO);
2435
2436 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2437 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2438 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2439 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2440 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2441
2442 set_opt(sbi->s_mount_opt, BARRIER);
2443
2444 /*
2445 * enable delayed allocation by default
2446 * Use -o nodelalloc to turn it off
2447 */
2448 set_opt(sbi->s_mount_opt, DELALLOC);
2449
2450 if (!parse_options((char *) data, sb, &journal_devnum,
2451 &journal_ioprio, NULL, 0))
2452 goto failed_mount;
2453
2454 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2455 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2456
2457 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2458 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2459 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2460 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2461 ext4_msg(sb, KERN_WARNING,
2462 "feature flags set on rev 0 fs, "
2463 "running e2fsck is recommended");
2464
2465 /*
2466 * Check feature flags regardless of the revision level, since we
2467 * previously didn't change the revision level when setting the flags,
2468 * so there is a chance incompat flags are set on a rev 0 filesystem.
2469 */
2470 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
2471 goto failed_mount;
2472
2473 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2474
2475 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2476 blocksize > EXT4_MAX_BLOCK_SIZE) {
2477 ext4_msg(sb, KERN_ERR,
2478 "Unsupported filesystem blocksize %d", blocksize);
2479 goto failed_mount;
2480 }
2481
2482 if (sb->s_blocksize != blocksize) {
2483 /* Validate the filesystem blocksize */
2484 if (!sb_set_blocksize(sb, blocksize)) {
2485 ext4_msg(sb, KERN_ERR, "bad block size %d",
2486 blocksize);
2487 goto failed_mount;
2488 }
2489
2490 brelse(bh);
2491 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2492 offset = do_div(logical_sb_block, blocksize);
2493 bh = sb_bread(sb, logical_sb_block);
2494 if (!bh) {
2495 ext4_msg(sb, KERN_ERR,
2496 "Can't read superblock on 2nd try");
2497 goto failed_mount;
2498 }
2499 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2500 sbi->s_es = es;
2501 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2502 ext4_msg(sb, KERN_ERR,
2503 "Magic mismatch, very weird!");
2504 goto failed_mount;
2505 }
2506 }
2507
2508 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2509 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2510 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2511 has_huge_files);
2512 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2513
2514 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2515 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2516 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2517 } else {
2518 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2519 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2520 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2521 (!is_power_of_2(sbi->s_inode_size)) ||
2522 (sbi->s_inode_size > blocksize)) {
2523 ext4_msg(sb, KERN_ERR,
2524 "unsupported inode size: %d",
2525 sbi->s_inode_size);
2526 goto failed_mount;
2527 }
2528 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2529 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2530 }
2531
2532 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2533 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2534 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2535 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2536 !is_power_of_2(sbi->s_desc_size)) {
2537 ext4_msg(sb, KERN_ERR,
2538 "unsupported descriptor size %lu",
2539 sbi->s_desc_size);
2540 goto failed_mount;
2541 }
2542 } else
2543 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2544
2545 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2546 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2547 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2548 goto cantfind_ext4;
2549
2550 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2551 if (sbi->s_inodes_per_block == 0)
2552 goto cantfind_ext4;
2553 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2554 sbi->s_inodes_per_block;
2555 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2556 sbi->s_sbh = bh;
2557 sbi->s_mount_state = le16_to_cpu(es->s_state);
2558 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2559 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2560
2561 for (i = 0; i < 4; i++)
2562 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2563 sbi->s_def_hash_version = es->s_def_hash_version;
2564 i = le32_to_cpu(es->s_flags);
2565 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2566 sbi->s_hash_unsigned = 3;
2567 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2568 #ifdef __CHAR_UNSIGNED__
2569 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2570 sbi->s_hash_unsigned = 3;
2571 #else
2572 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2573 #endif
2574 sb->s_dirt = 1;
2575 }
2576
2577 if (sbi->s_blocks_per_group > blocksize * 8) {
2578 ext4_msg(sb, KERN_ERR,
2579 "#blocks per group too big: %lu",
2580 sbi->s_blocks_per_group);
2581 goto failed_mount;
2582 }
2583 if (sbi->s_inodes_per_group > blocksize * 8) {
2584 ext4_msg(sb, KERN_ERR,
2585 "#inodes per group too big: %lu",
2586 sbi->s_inodes_per_group);
2587 goto failed_mount;
2588 }
2589
2590 /*
2591 * Test whether we have more sectors than will fit in sector_t,
2592 * and whether the max offset is addressable by the page cache.
2593 */
2594 if ((ext4_blocks_count(es) >
2595 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2596 (ext4_blocks_count(es) >
2597 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
2598 ext4_msg(sb, KERN_ERR, "filesystem"
2599 " too large to mount safely on this system");
2600 if (sizeof(sector_t) < 8)
2601 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
2602 ret = -EFBIG;
2603 goto failed_mount;
2604 }
2605
2606 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2607 goto cantfind_ext4;
2608
2609 /* check blocks count against device size */
2610 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2611 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2612 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2613 "exceeds size of device (%llu blocks)",
2614 ext4_blocks_count(es), blocks_count);
2615 goto failed_mount;
2616 }
2617
2618 /*
2619 * It makes no sense for the first data block to be beyond the end
2620 * of the filesystem.
2621 */
2622 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2623 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2624 "block %u is beyond end of filesystem (%llu)",
2625 le32_to_cpu(es->s_first_data_block),
2626 ext4_blocks_count(es));
2627 goto failed_mount;
2628 }
2629 blocks_count = (ext4_blocks_count(es) -
2630 le32_to_cpu(es->s_first_data_block) +
2631 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2632 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2633 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2634 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
2635 "(block count %llu, first data block %u, "
2636 "blocks per group %lu)", sbi->s_groups_count,
2637 ext4_blocks_count(es),
2638 le32_to_cpu(es->s_first_data_block),
2639 EXT4_BLOCKS_PER_GROUP(sb));
2640 goto failed_mount;
2641 }
2642 sbi->s_groups_count = blocks_count;
2643 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2644 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
2645 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2646 EXT4_DESC_PER_BLOCK(sb);
2647 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2648 GFP_KERNEL);
2649 if (sbi->s_group_desc == NULL) {
2650 ext4_msg(sb, KERN_ERR, "not enough memory");
2651 goto failed_mount;
2652 }
2653
2654 #ifdef CONFIG_PROC_FS
2655 if (ext4_proc_root)
2656 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2657 #endif
2658
2659 bgl_lock_init(sbi->s_blockgroup_lock);
2660
2661 for (i = 0; i < db_count; i++) {
2662 block = descriptor_loc(sb, logical_sb_block, i);
2663 sbi->s_group_desc[i] = sb_bread(sb, block);
2664 if (!sbi->s_group_desc[i]) {
2665 ext4_msg(sb, KERN_ERR,
2666 "can't read group descriptor %d", i);
2667 db_count = i;
2668 goto failed_mount2;
2669 }
2670 }
2671 if (!ext4_check_descriptors(sb)) {
2672 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
2673 goto failed_mount2;
2674 }
2675 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2676 if (!ext4_fill_flex_info(sb)) {
2677 ext4_msg(sb, KERN_ERR,
2678 "unable to initialize "
2679 "flex_bg meta info!");
2680 goto failed_mount2;
2681 }
2682
2683 sbi->s_gdb_count = db_count;
2684 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2685 spin_lock_init(&sbi->s_next_gen_lock);
2686
2687 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2688 ext4_count_free_blocks(sb));
2689 if (!err) {
2690 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2691 ext4_count_free_inodes(sb));
2692 }
2693 if (!err) {
2694 err = percpu_counter_init(&sbi->s_dirs_counter,
2695 ext4_count_dirs(sb));
2696 }
2697 if (!err) {
2698 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2699 }
2700 if (err) {
2701 ext4_msg(sb, KERN_ERR, "insufficient memory");
2702 goto failed_mount3;
2703 }
2704
2705 sbi->s_stripe = ext4_get_stripe_size(sbi);
2706 sbi->s_max_writeback_mb_bump = 128;
2707
2708 /*
2709 * set up enough so that it can read an inode
2710 */
2711 if (!test_opt(sb, NOLOAD) &&
2712 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2713 sb->s_op = &ext4_sops;
2714 else
2715 sb->s_op = &ext4_nojournal_sops;
2716 sb->s_export_op = &ext4_export_ops;
2717 sb->s_xattr = ext4_xattr_handlers;
2718 #ifdef CONFIG_QUOTA
2719 sb->s_qcop = &ext4_qctl_operations;
2720 sb->dq_op = &ext4_quota_operations;
2721 #endif
2722 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2723 mutex_init(&sbi->s_orphan_lock);
2724 mutex_init(&sbi->s_resize_lock);
2725
2726 sb->s_root = NULL;
2727
2728 needs_recovery = (es->s_last_orphan != 0 ||
2729 EXT4_HAS_INCOMPAT_FEATURE(sb,
2730 EXT4_FEATURE_INCOMPAT_RECOVER));
2731
2732 /*
2733 * The first inode we look at is the journal inode. Don't try
2734 * root first: it may be modified in the journal!
2735 */
2736 if (!test_opt(sb, NOLOAD) &&
2737 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2738 if (ext4_load_journal(sb, es, journal_devnum))
2739 goto failed_mount3;
2740 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2741 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2742 ext4_msg(sb, KERN_ERR, "required journal recovery "
2743 "suppressed and not mounted read-only");
2744 goto failed_mount4;
2745 } else {
2746 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2747 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2748 sbi->s_journal = NULL;
2749 needs_recovery = 0;
2750 goto no_journal;
2751 }
2752
2753 if (ext4_blocks_count(es) > 0xffffffffULL &&
2754 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2755 JBD2_FEATURE_INCOMPAT_64BIT)) {
2756 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
2757 goto failed_mount4;
2758 }
2759
2760 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2761 jbd2_journal_set_features(sbi->s_journal,
2762 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2763 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2764 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2765 jbd2_journal_set_features(sbi->s_journal,
2766 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2767 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2768 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2769 } else {
2770 jbd2_journal_clear_features(sbi->s_journal,
2771 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2772 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2773 }
2774
2775 /* We have now updated the journal if required, so we can
2776 * validate the data journaling mode. */
2777 switch (test_opt(sb, DATA_FLAGS)) {
2778 case 0:
2779 /* No mode set, assume a default based on the journal
2780 * capabilities: ORDERED_DATA if the journal can
2781 * cope, else JOURNAL_DATA
2782 */
2783 if (jbd2_journal_check_available_features
2784 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2785 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2786 else
2787 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2788 break;
2789
2790 case EXT4_MOUNT_ORDERED_DATA:
2791 case EXT4_MOUNT_WRITEBACK_DATA:
2792 if (!jbd2_journal_check_available_features
2793 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2794 ext4_msg(sb, KERN_ERR, "Journal does not support "
2795 "requested data journaling mode");
2796 goto failed_mount4;
2797 }
2798 default:
2799 break;
2800 }
2801 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2802
2803 no_journal:
2804
2805 if (test_opt(sb, NOBH)) {
2806 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2807 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2808 "its supported only with writeback mode");
2809 clear_opt(sbi->s_mount_opt, NOBH);
2810 }
2811 }
2812 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2813 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2814 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2815 goto failed_mount_wq;
2816 }
2817
2818 /*
2819 * The jbd2_journal_load will have done any necessary log recovery,
2820 * so we can safely mount the rest of the filesystem now.
2821 */
2822
2823 root = ext4_iget(sb, EXT4_ROOT_INO);
2824 if (IS_ERR(root)) {
2825 ext4_msg(sb, KERN_ERR, "get root inode failed");
2826 ret = PTR_ERR(root);
2827 goto failed_mount4;
2828 }
2829 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2830 iput(root);
2831 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
2832 goto failed_mount4;
2833 }
2834 sb->s_root = d_alloc_root(root);
2835 if (!sb->s_root) {
2836 ext4_msg(sb, KERN_ERR, "get root dentry failed");
2837 iput(root);
2838 ret = -ENOMEM;
2839 goto failed_mount4;
2840 }
2841
2842 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2843
2844 /* determine the minimum size of new large inodes, if present */
2845 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2846 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2847 EXT4_GOOD_OLD_INODE_SIZE;
2848 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2849 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2850 if (sbi->s_want_extra_isize <
2851 le16_to_cpu(es->s_want_extra_isize))
2852 sbi->s_want_extra_isize =
2853 le16_to_cpu(es->s_want_extra_isize);
2854 if (sbi->s_want_extra_isize <
2855 le16_to_cpu(es->s_min_extra_isize))
2856 sbi->s_want_extra_isize =
2857 le16_to_cpu(es->s_min_extra_isize);
2858 }
2859 }
2860 /* Check if enough inode space is available */
2861 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2862 sbi->s_inode_size) {
2863 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2864 EXT4_GOOD_OLD_INODE_SIZE;
2865 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2866 "available");
2867 }
2868
2869 if (test_opt(sb, DELALLOC) &&
2870 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2871 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2872 "requested data journaling mode");
2873 clear_opt(sbi->s_mount_opt, DELALLOC);
2874 }
2875
2876 err = ext4_setup_system_zone(sb);
2877 if (err) {
2878 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2879 "zone (%d)\n", err);
2880 goto failed_mount4;
2881 }
2882
2883 ext4_ext_init(sb);
2884 err = ext4_mb_init(sb, needs_recovery);
2885 if (err) {
2886 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2887 err);
2888 goto failed_mount4;
2889 }
2890
2891 sbi->s_kobj.kset = ext4_kset;
2892 init_completion(&sbi->s_kobj_unregister);
2893 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2894 "%s", sb->s_id);
2895 if (err) {
2896 ext4_mb_release(sb);
2897 ext4_ext_release(sb);
2898 goto failed_mount4;
2899 };
2900
2901 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2902 ext4_orphan_cleanup(sb, es);
2903 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2904 if (needs_recovery) {
2905 ext4_msg(sb, KERN_INFO, "recovery complete");
2906 ext4_mark_recovery_complete(sb, es);
2907 }
2908 if (EXT4_SB(sb)->s_journal) {
2909 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2910 descr = " journalled data mode";
2911 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2912 descr = " ordered data mode";
2913 else
2914 descr = " writeback data mode";
2915 } else
2916 descr = "out journal";
2917
2918 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
2919
2920 lock_kernel();
2921 return 0;
2922
2923 cantfind_ext4:
2924 if (!silent)
2925 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
2926 goto failed_mount;
2927
2928 failed_mount4:
2929 ext4_msg(sb, KERN_ERR, "mount failed");
2930 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2931 failed_mount_wq:
2932 ext4_release_system_zone(sb);
2933 if (sbi->s_journal) {
2934 jbd2_journal_destroy(sbi->s_journal);
2935 sbi->s_journal = NULL;
2936 }
2937 failed_mount3:
2938 if (sbi->s_flex_groups) {
2939 if (is_vmalloc_addr(sbi->s_flex_groups))
2940 vfree(sbi->s_flex_groups);
2941 else
2942 kfree(sbi->s_flex_groups);
2943 }
2944 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2945 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2946 percpu_counter_destroy(&sbi->s_dirs_counter);
2947 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2948 failed_mount2:
2949 for (i = 0; i < db_count; i++)
2950 brelse(sbi->s_group_desc[i]);
2951 kfree(sbi->s_group_desc);
2952 failed_mount:
2953 if (sbi->s_proc) {
2954 remove_proc_entry(sb->s_id, ext4_proc_root);
2955 }
2956 #ifdef CONFIG_QUOTA
2957 for (i = 0; i < MAXQUOTAS; i++)
2958 kfree(sbi->s_qf_names[i]);
2959 #endif
2960 ext4_blkdev_remove(sbi);
2961 brelse(bh);
2962 out_fail:
2963 sb->s_fs_info = NULL;
2964 kfree(sbi->s_blockgroup_lock);
2965 kfree(sbi);
2966 lock_kernel();
2967 return ret;
2968 }
2969
2970 /*
2971 * Setup any per-fs journal parameters now. We'll do this both on
2972 * initial mount, once the journal has been initialised but before we've
2973 * done any recovery; and again on any subsequent remount.
2974 */
2975 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2976 {
2977 struct ext4_sb_info *sbi = EXT4_SB(sb);
2978
2979 journal->j_commit_interval = sbi->s_commit_interval;
2980 journal->j_min_batch_time = sbi->s_min_batch_time;
2981 journal->j_max_batch_time = sbi->s_max_batch_time;
2982
2983 spin_lock(&journal->j_state_lock);
2984 if (test_opt(sb, BARRIER))
2985 journal->j_flags |= JBD2_BARRIER;
2986 else
2987 journal->j_flags &= ~JBD2_BARRIER;
2988 if (test_opt(sb, DATA_ERR_ABORT))
2989 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2990 else
2991 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
2992 spin_unlock(&journal->j_state_lock);
2993 }
2994
2995 static journal_t *ext4_get_journal(struct super_block *sb,
2996 unsigned int journal_inum)
2997 {
2998 struct inode *journal_inode;
2999 journal_t *journal;
3000
3001 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3002
3003 /* First, test for the existence of a valid inode on disk. Bad
3004 * things happen if we iget() an unused inode, as the subsequent
3005 * iput() will try to delete it. */
3006
3007 journal_inode = ext4_iget(sb, journal_inum);
3008 if (IS_ERR(journal_inode)) {
3009 ext4_msg(sb, KERN_ERR, "no journal found");
3010 return NULL;
3011 }
3012 if (!journal_inode->i_nlink) {
3013 make_bad_inode(journal_inode);
3014 iput(journal_inode);
3015 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3016 return NULL;
3017 }
3018
3019 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3020 journal_inode, journal_inode->i_size);
3021 if (!S_ISREG(journal_inode->i_mode)) {
3022 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3023 iput(journal_inode);
3024 return NULL;
3025 }
3026
3027 journal = jbd2_journal_init_inode(journal_inode);
3028 if (!journal) {
3029 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3030 iput(journal_inode);
3031 return NULL;
3032 }
3033 journal->j_private = sb;
3034 ext4_init_journal_params(sb, journal);
3035 return journal;
3036 }
3037
3038 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3039 dev_t j_dev)
3040 {
3041 struct buffer_head *bh;
3042 journal_t *journal;
3043 ext4_fsblk_t start;
3044 ext4_fsblk_t len;
3045 int hblock, blocksize;
3046 ext4_fsblk_t sb_block;
3047 unsigned long offset;
3048 struct ext4_super_block *es;
3049 struct block_device *bdev;
3050
3051 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3052
3053 bdev = ext4_blkdev_get(j_dev, sb);
3054 if (bdev == NULL)
3055 return NULL;
3056
3057 if (bd_claim(bdev, sb)) {
3058 ext4_msg(sb, KERN_ERR,
3059 "failed to claim external journal device");
3060 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3061 return NULL;
3062 }
3063
3064 blocksize = sb->s_blocksize;
3065 hblock = bdev_logical_block_size(bdev);
3066 if (blocksize < hblock) {
3067 ext4_msg(sb, KERN_ERR,
3068 "blocksize too small for journal device");
3069 goto out_bdev;
3070 }
3071
3072 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3073 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3074 set_blocksize(bdev, blocksize);
3075 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3076 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3077 "external journal");
3078 goto out_bdev;
3079 }
3080
3081 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3082 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3083 !(le32_to_cpu(es->s_feature_incompat) &
3084 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3085 ext4_msg(sb, KERN_ERR, "external journal has "
3086 "bad superblock");
3087 brelse(bh);
3088 goto out_bdev;
3089 }
3090
3091 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3092 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3093 brelse(bh);
3094 goto out_bdev;
3095 }
3096
3097 len = ext4_blocks_count(es);
3098 start = sb_block + 1;
3099 brelse(bh); /* we're done with the superblock */
3100
3101 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3102 start, len, blocksize);
3103 if (!journal) {
3104 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3105 goto out_bdev;
3106 }
3107 journal->j_private = sb;
3108 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3109 wait_on_buffer(journal->j_sb_buffer);
3110 if (!buffer_uptodate(journal->j_sb_buffer)) {
3111 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3112 goto out_journal;
3113 }
3114 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3115 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3116 "user (unsupported) - %d",
3117 be32_to_cpu(journal->j_superblock->s_nr_users));
3118 goto out_journal;
3119 }
3120 EXT4_SB(sb)->journal_bdev = bdev;
3121 ext4_init_journal_params(sb, journal);
3122 return journal;
3123
3124 out_journal:
3125 jbd2_journal_destroy(journal);
3126 out_bdev:
3127 ext4_blkdev_put(bdev);
3128 return NULL;
3129 }
3130
3131 static int ext4_load_journal(struct super_block *sb,
3132 struct ext4_super_block *es,
3133 unsigned long journal_devnum)
3134 {
3135 journal_t *journal;
3136 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3137 dev_t journal_dev;
3138 int err = 0;
3139 int really_read_only;
3140
3141 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3142
3143 if (journal_devnum &&
3144 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3145 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3146 "numbers have changed");
3147 journal_dev = new_decode_dev(journal_devnum);
3148 } else
3149 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3150
3151 really_read_only = bdev_read_only(sb->s_bdev);
3152
3153 /*
3154 * Are we loading a blank journal or performing recovery after a
3155 * crash? For recovery, we need to check in advance whether we
3156 * can get read-write access to the device.
3157 */
3158 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3159 if (sb->s_flags & MS_RDONLY) {
3160 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3161 "required on readonly filesystem");
3162 if (really_read_only) {
3163 ext4_msg(sb, KERN_ERR, "write access "
3164 "unavailable, cannot proceed");
3165 return -EROFS;
3166 }
3167 ext4_msg(sb, KERN_INFO, "write access will "
3168 "be enabled during recovery");
3169 }
3170 }
3171
3172 if (journal_inum && journal_dev) {
3173 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3174 "and inode journals!");
3175 return -EINVAL;
3176 }
3177
3178 if (journal_inum) {
3179 if (!(journal = ext4_get_journal(sb, journal_inum)))
3180 return -EINVAL;
3181 } else {
3182 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3183 return -EINVAL;
3184 }
3185
3186 if (!(journal->j_flags & JBD2_BARRIER))
3187 ext4_msg(sb, KERN_INFO, "barriers disabled");
3188
3189 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3190 err = jbd2_journal_update_format(journal);
3191 if (err) {
3192 ext4_msg(sb, KERN_ERR, "error updating journal");
3193 jbd2_journal_destroy(journal);
3194 return err;
3195 }
3196 }
3197
3198 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3199 err = jbd2_journal_wipe(journal, !really_read_only);
3200 if (!err)
3201 err = jbd2_journal_load(journal);
3202
3203 if (err) {
3204 ext4_msg(sb, KERN_ERR, "error loading journal");
3205 jbd2_journal_destroy(journal);
3206 return err;
3207 }
3208
3209 EXT4_SB(sb)->s_journal = journal;
3210 ext4_clear_journal_err(sb, es);
3211
3212 if (journal_devnum &&
3213 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3214 es->s_journal_dev = cpu_to_le32(journal_devnum);
3215
3216 /* Make sure we flush the recovery flag to disk. */
3217 ext4_commit_super(sb, 1);
3218 }
3219
3220 return 0;
3221 }
3222
3223 static int ext4_commit_super(struct super_block *sb, int sync)
3224 {
3225 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3226 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3227 int error = 0;
3228
3229 if (!sbh)
3230 return error;
3231 if (buffer_write_io_error(sbh)) {
3232 /*
3233 * Oh, dear. A previous attempt to write the
3234 * superblock failed. This could happen because the
3235 * USB device was yanked out. Or it could happen to
3236 * be a transient write error and maybe the block will
3237 * be remapped. Nothing we can do but to retry the
3238 * write and hope for the best.
3239 */
3240 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3241 "superblock detected");
3242 clear_buffer_write_io_error(sbh);
3243 set_buffer_uptodate(sbh);
3244 }
3245 /*
3246 * If the file system is mounted read-only, don't update the
3247 * superblock write time. This avoids updating the superblock
3248 * write time when we are mounting the root file system
3249 * read/only but we need to replay the journal; at that point,
3250 * for people who are east of GMT and who make their clock
3251 * tick in localtime for Windows bug-for-bug compatibility,
3252 * the clock is set in the future, and this will cause e2fsck
3253 * to complain and force a full file system check.
3254 */
3255 if (!(sb->s_flags & MS_RDONLY))
3256 es->s_wtime = cpu_to_le32(get_seconds());
3257 es->s_kbytes_written =
3258 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3259 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3260 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3261 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3262 &EXT4_SB(sb)->s_freeblocks_counter));
3263 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3264 &EXT4_SB(sb)->s_freeinodes_counter));
3265 sb->s_dirt = 0;
3266 BUFFER_TRACE(sbh, "marking dirty");
3267 mark_buffer_dirty(sbh);
3268 if (sync) {
3269 error = sync_dirty_buffer(sbh);
3270 if (error)
3271 return error;
3272
3273 error = buffer_write_io_error(sbh);
3274 if (error) {
3275 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3276 "superblock");
3277 clear_buffer_write_io_error(sbh);
3278 set_buffer_uptodate(sbh);
3279 }
3280 }
3281 return error;
3282 }
3283
3284 /*
3285 * Have we just finished recovery? If so, and if we are mounting (or
3286 * remounting) the filesystem readonly, then we will end up with a
3287 * consistent fs on disk. Record that fact.
3288 */
3289 static void ext4_mark_recovery_complete(struct super_block *sb,
3290 struct ext4_super_block *es)
3291 {
3292 journal_t *journal = EXT4_SB(sb)->s_journal;
3293
3294 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3295 BUG_ON(journal != NULL);
3296 return;
3297 }
3298 jbd2_journal_lock_updates(journal);
3299 if (jbd2_journal_flush(journal) < 0)
3300 goto out;
3301
3302 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
3303 sb->s_flags & MS_RDONLY) {
3304 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3305 ext4_commit_super(sb, 1);
3306 }
3307
3308 out:
3309 jbd2_journal_unlock_updates(journal);
3310 }
3311
3312 /*
3313 * If we are mounting (or read-write remounting) a filesystem whose journal
3314 * has recorded an error from a previous lifetime, move that error to the
3315 * main filesystem now.
3316 */
3317 static void ext4_clear_journal_err(struct super_block *sb,
3318 struct ext4_super_block *es)
3319 {
3320 journal_t *journal;
3321 int j_errno;
3322 const char *errstr;
3323
3324 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3325
3326 journal = EXT4_SB(sb)->s_journal;
3327
3328 /*
3329 * Now check for any error status which may have been recorded in the
3330 * journal by a prior ext4_error() or ext4_abort()
3331 */
3332
3333 j_errno = jbd2_journal_errno(journal);
3334 if (j_errno) {
3335 char nbuf[16];
3336
3337 errstr = ext4_decode_error(sb, j_errno, nbuf);
3338 ext4_warning(sb, __func__, "Filesystem error recorded "
3339 "from previous mount: %s", errstr);
3340 ext4_warning(sb, __func__, "Marking fs in need of "
3341 "filesystem check.");
3342
3343 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3344 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3345 ext4_commit_super(sb, 1);
3346
3347 jbd2_journal_clear_err(journal);
3348 }
3349 }
3350
3351 /*
3352 * Force the running and committing transactions to commit,
3353 * and wait on the commit.
3354 */
3355 int ext4_force_commit(struct super_block *sb)
3356 {
3357 journal_t *journal;
3358 int ret = 0;
3359
3360 if (sb->s_flags & MS_RDONLY)
3361 return 0;
3362
3363 journal = EXT4_SB(sb)->s_journal;
3364 if (journal)
3365 ret = ext4_journal_force_commit(journal);
3366
3367 return ret;
3368 }
3369
3370 static void ext4_write_super(struct super_block *sb)
3371 {
3372 lock_super(sb);
3373 ext4_commit_super(sb, 1);
3374 unlock_super(sb);
3375 }
3376
3377 static int ext4_sync_fs(struct super_block *sb, int wait)
3378 {
3379 int ret = 0;
3380 tid_t target;
3381 struct ext4_sb_info *sbi = EXT4_SB(sb);
3382
3383 trace_ext4_sync_fs(sb, wait);
3384 flush_workqueue(sbi->dio_unwritten_wq);
3385 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
3386 if (wait)
3387 jbd2_log_wait_commit(sbi->s_journal, target);
3388 }
3389 return ret;
3390 }
3391
3392 /*
3393 * LVM calls this function before a (read-only) snapshot is created. This
3394 * gives us a chance to flush the journal completely and mark the fs clean.
3395 */
3396 static int ext4_freeze(struct super_block *sb)
3397 {
3398 int error = 0;
3399 journal_t *journal;
3400
3401 if (sb->s_flags & MS_RDONLY)
3402 return 0;
3403
3404 journal = EXT4_SB(sb)->s_journal;
3405
3406 /* Now we set up the journal barrier. */
3407 jbd2_journal_lock_updates(journal);
3408
3409 /*
3410 * Don't clear the needs_recovery flag if we failed to flush
3411 * the journal.
3412 */
3413 error = jbd2_journal_flush(journal);
3414 if (error < 0) {
3415 out:
3416 jbd2_journal_unlock_updates(journal);
3417 return error;
3418 }
3419
3420 /* Journal blocked and flushed, clear needs_recovery flag. */
3421 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3422 error = ext4_commit_super(sb, 1);
3423 if (error)
3424 goto out;
3425 return 0;
3426 }
3427
3428 /*
3429 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3430 * flag here, even though the filesystem is not technically dirty yet.
3431 */
3432 static int ext4_unfreeze(struct super_block *sb)
3433 {
3434 if (sb->s_flags & MS_RDONLY)
3435 return 0;
3436
3437 lock_super(sb);
3438 /* Reset the needs_recovery flag before the fs is unlocked. */
3439 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3440 ext4_commit_super(sb, 1);
3441 unlock_super(sb);
3442 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3443 return 0;
3444 }
3445
3446 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3447 {
3448 struct ext4_super_block *es;
3449 struct ext4_sb_info *sbi = EXT4_SB(sb);
3450 ext4_fsblk_t n_blocks_count = 0;
3451 unsigned long old_sb_flags;
3452 struct ext4_mount_options old_opts;
3453 ext4_group_t g;
3454 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3455 int err;
3456 #ifdef CONFIG_QUOTA
3457 int i;
3458 #endif
3459
3460 lock_kernel();
3461
3462 /* Store the original options */
3463 lock_super(sb);
3464 old_sb_flags = sb->s_flags;
3465 old_opts.s_mount_opt = sbi->s_mount_opt;
3466 old_opts.s_resuid = sbi->s_resuid;
3467 old_opts.s_resgid = sbi->s_resgid;
3468 old_opts.s_commit_interval = sbi->s_commit_interval;
3469 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3470 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3471 #ifdef CONFIG_QUOTA
3472 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3473 for (i = 0; i < MAXQUOTAS; i++)
3474 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3475 #endif
3476 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3477 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3478
3479 /*
3480 * Allow the "check" option to be passed as a remount option.
3481 */
3482 if (!parse_options(data, sb, NULL, &journal_ioprio,
3483 &n_blocks_count, 1)) {
3484 err = -EINVAL;
3485 goto restore_opts;
3486 }
3487
3488 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
3489 ext4_abort(sb, __func__, "Abort forced by user");
3490
3491 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3492 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
3493
3494 es = sbi->s_es;
3495
3496 if (sbi->s_journal) {
3497 ext4_init_journal_params(sb, sbi->s_journal);
3498 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3499 }
3500
3501 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3502 n_blocks_count > ext4_blocks_count(es)) {
3503 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
3504 err = -EROFS;
3505 goto restore_opts;
3506 }
3507
3508 if (*flags & MS_RDONLY) {
3509 /*
3510 * First of all, the unconditional stuff we have to do
3511 * to disable replay of the journal when we next remount
3512 */
3513 sb->s_flags |= MS_RDONLY;
3514
3515 /*
3516 * OK, test if we are remounting a valid rw partition
3517 * readonly, and if so set the rdonly flag and then
3518 * mark the partition as valid again.
3519 */
3520 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3521 (sbi->s_mount_state & EXT4_VALID_FS))
3522 es->s_state = cpu_to_le16(sbi->s_mount_state);
3523
3524 if (sbi->s_journal)
3525 ext4_mark_recovery_complete(sb, es);
3526 } else {
3527 /* Make sure we can mount this feature set readwrite */
3528 if (!ext4_feature_set_ok(sb, 0)) {
3529 err = -EROFS;
3530 goto restore_opts;
3531 }
3532 /*
3533 * Make sure the group descriptor checksums
3534 * are sane. If they aren't, refuse to remount r/w.
3535 */
3536 for (g = 0; g < sbi->s_groups_count; g++) {
3537 struct ext4_group_desc *gdp =
3538 ext4_get_group_desc(sb, g, NULL);
3539
3540 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3541 ext4_msg(sb, KERN_ERR,
3542 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3543 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3544 le16_to_cpu(gdp->bg_checksum));
3545 err = -EINVAL;
3546 goto restore_opts;
3547 }
3548 }
3549
3550 /*
3551 * If we have an unprocessed orphan list hanging
3552 * around from a previously readonly bdev mount,
3553 * require a full umount/remount for now.
3554 */
3555 if (es->s_last_orphan) {
3556 ext4_msg(sb, KERN_WARNING, "Couldn't "
3557 "remount RDWR because of unprocessed "
3558 "orphan inode list. Please "
3559 "umount/remount instead");
3560 err = -EINVAL;
3561 goto restore_opts;
3562 }
3563
3564 /*
3565 * Mounting a RDONLY partition read-write, so reread
3566 * and store the current valid flag. (It may have
3567 * been changed by e2fsck since we originally mounted
3568 * the partition.)
3569 */
3570 if (sbi->s_journal)
3571 ext4_clear_journal_err(sb, es);
3572 sbi->s_mount_state = le16_to_cpu(es->s_state);
3573 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3574 goto restore_opts;
3575 if (!ext4_setup_super(sb, es, 0))
3576 sb->s_flags &= ~MS_RDONLY;
3577 }
3578 }
3579 ext4_setup_system_zone(sb);
3580 if (sbi->s_journal == NULL)
3581 ext4_commit_super(sb, 1);
3582
3583 #ifdef CONFIG_QUOTA
3584 /* Release old quota file names */
3585 for (i = 0; i < MAXQUOTAS; i++)
3586 if (old_opts.s_qf_names[i] &&
3587 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3588 kfree(old_opts.s_qf_names[i]);
3589 #endif
3590 unlock_super(sb);
3591 unlock_kernel();
3592 return 0;
3593
3594 restore_opts:
3595 sb->s_flags = old_sb_flags;
3596 sbi->s_mount_opt = old_opts.s_mount_opt;
3597 sbi->s_resuid = old_opts.s_resuid;
3598 sbi->s_resgid = old_opts.s_resgid;
3599 sbi->s_commit_interval = old_opts.s_commit_interval;
3600 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3601 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3602 #ifdef CONFIG_QUOTA
3603 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3604 for (i = 0; i < MAXQUOTAS; i++) {
3605 if (sbi->s_qf_names[i] &&
3606 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3607 kfree(sbi->s_qf_names[i]);
3608 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3609 }
3610 #endif
3611 unlock_super(sb);
3612 unlock_kernel();
3613 return err;
3614 }
3615
3616 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3617 {
3618 struct super_block *sb = dentry->d_sb;
3619 struct ext4_sb_info *sbi = EXT4_SB(sb);
3620 struct ext4_super_block *es = sbi->s_es;
3621 u64 fsid;
3622
3623 if (test_opt(sb, MINIX_DF)) {
3624 sbi->s_overhead_last = 0;
3625 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3626 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3627 ext4_fsblk_t overhead = 0;
3628
3629 /*
3630 * Compute the overhead (FS structures). This is constant
3631 * for a given filesystem unless the number of block groups
3632 * changes so we cache the previous value until it does.
3633 */
3634
3635 /*
3636 * All of the blocks before first_data_block are
3637 * overhead
3638 */
3639 overhead = le32_to_cpu(es->s_first_data_block);
3640
3641 /*
3642 * Add the overhead attributed to the superblock and
3643 * block group descriptors. If the sparse superblocks
3644 * feature is turned on, then not all groups have this.
3645 */
3646 for (i = 0; i < ngroups; i++) {
3647 overhead += ext4_bg_has_super(sb, i) +
3648 ext4_bg_num_gdb(sb, i);
3649 cond_resched();
3650 }
3651
3652 /*
3653 * Every block group has an inode bitmap, a block
3654 * bitmap, and an inode table.
3655 */
3656 overhead += ngroups * (2 + sbi->s_itb_per_group);
3657 sbi->s_overhead_last = overhead;
3658 smp_wmb();
3659 sbi->s_blocks_last = ext4_blocks_count(es);
3660 }
3661
3662 buf->f_type = EXT4_SUPER_MAGIC;
3663 buf->f_bsize = sb->s_blocksize;
3664 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3665 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3666 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3667 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3668 if (buf->f_bfree < ext4_r_blocks_count(es))
3669 buf->f_bavail = 0;
3670 buf->f_files = le32_to_cpu(es->s_inodes_count);
3671 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3672 buf->f_namelen = EXT4_NAME_LEN;
3673 fsid = le64_to_cpup((void *)es->s_uuid) ^
3674 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3675 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3676 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3677
3678 return 0;
3679 }
3680
3681 /* Helper function for writing quotas on sync - we need to start transaction
3682 * before quota file is locked for write. Otherwise the are possible deadlocks:
3683 * Process 1 Process 2
3684 * ext4_create() quota_sync()
3685 * jbd2_journal_start() write_dquot()
3686 * vfs_dq_init() down(dqio_mutex)
3687 * down(dqio_mutex) jbd2_journal_start()
3688 *
3689 */
3690
3691 #ifdef CONFIG_QUOTA
3692
3693 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3694 {
3695 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3696 }
3697
3698 static int ext4_write_dquot(struct dquot *dquot)
3699 {
3700 int ret, err;
3701 handle_t *handle;
3702 struct inode *inode;
3703
3704 inode = dquot_to_inode(dquot);
3705 handle = ext4_journal_start(inode,
3706 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3707 if (IS_ERR(handle))
3708 return PTR_ERR(handle);
3709 ret = dquot_commit(dquot);
3710 err = ext4_journal_stop(handle);
3711 if (!ret)
3712 ret = err;
3713 return ret;
3714 }
3715
3716 static int ext4_acquire_dquot(struct dquot *dquot)
3717 {
3718 int ret, err;
3719 handle_t *handle;
3720
3721 handle = ext4_journal_start(dquot_to_inode(dquot),
3722 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3723 if (IS_ERR(handle))
3724 return PTR_ERR(handle);
3725 ret = dquot_acquire(dquot);
3726 err = ext4_journal_stop(handle);
3727 if (!ret)
3728 ret = err;
3729 return ret;
3730 }
3731
3732 static int ext4_release_dquot(struct dquot *dquot)
3733 {
3734 int ret, err;
3735 handle_t *handle;
3736
3737 handle = ext4_journal_start(dquot_to_inode(dquot),
3738 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3739 if (IS_ERR(handle)) {
3740 /* Release dquot anyway to avoid endless cycle in dqput() */
3741 dquot_release(dquot);
3742 return PTR_ERR(handle);
3743 }
3744 ret = dquot_release(dquot);
3745 err = ext4_journal_stop(handle);
3746 if (!ret)
3747 ret = err;
3748 return ret;
3749 }
3750
3751 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3752 {
3753 /* Are we journaling quotas? */
3754 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3755 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3756 dquot_mark_dquot_dirty(dquot);
3757 return ext4_write_dquot(dquot);
3758 } else {
3759 return dquot_mark_dquot_dirty(dquot);
3760 }
3761 }
3762
3763 static int ext4_write_info(struct super_block *sb, int type)
3764 {
3765 int ret, err;
3766 handle_t *handle;
3767
3768 /* Data block + inode block */
3769 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3770 if (IS_ERR(handle))
3771 return PTR_ERR(handle);
3772 ret = dquot_commit_info(sb, type);
3773 err = ext4_journal_stop(handle);
3774 if (!ret)
3775 ret = err;
3776 return ret;
3777 }
3778
3779 /*
3780 * Turn on quotas during mount time - we need to find
3781 * the quota file and such...
3782 */
3783 static int ext4_quota_on_mount(struct super_block *sb, int type)
3784 {
3785 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3786 EXT4_SB(sb)->s_jquota_fmt, type);
3787 }
3788
3789 /*
3790 * Standard function to be called on quota_on
3791 */
3792 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3793 char *name, int remount)
3794 {
3795 int err;
3796 struct path path;
3797
3798 if (!test_opt(sb, QUOTA))
3799 return -EINVAL;
3800 /* When remounting, no checks are needed and in fact, name is NULL */
3801 if (remount)
3802 return vfs_quota_on(sb, type, format_id, name, remount);
3803
3804 err = kern_path(name, LOOKUP_FOLLOW, &path);
3805 if (err)
3806 return err;
3807
3808 /* Quotafile not on the same filesystem? */
3809 if (path.mnt->mnt_sb != sb) {
3810 path_put(&path);
3811 return -EXDEV;
3812 }
3813 /* Journaling quota? */
3814 if (EXT4_SB(sb)->s_qf_names[type]) {
3815 /* Quotafile not in fs root? */
3816 if (path.dentry->d_parent != sb->s_root)
3817 ext4_msg(sb, KERN_WARNING,
3818 "Quota file not on filesystem root. "
3819 "Journaled quota will not work");
3820 }
3821
3822 /*
3823 * When we journal data on quota file, we have to flush journal to see
3824 * all updates to the file when we bypass pagecache...
3825 */
3826 if (EXT4_SB(sb)->s_journal &&
3827 ext4_should_journal_data(path.dentry->d_inode)) {
3828 /*
3829 * We don't need to lock updates but journal_flush() could
3830 * otherwise be livelocked...
3831 */
3832 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3833 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3834 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3835 if (err) {
3836 path_put(&path);
3837 return err;
3838 }
3839 }
3840
3841 err = vfs_quota_on_path(sb, type, format_id, &path);
3842 path_put(&path);
3843 return err;
3844 }
3845
3846 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3847 * acquiring the locks... As quota files are never truncated and quota code
3848 * itself serializes the operations (and noone else should touch the files)
3849 * we don't have to be afraid of races */
3850 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3851 size_t len, loff_t off)
3852 {
3853 struct inode *inode = sb_dqopt(sb)->files[type];
3854 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3855 int err = 0;
3856 int offset = off & (sb->s_blocksize - 1);
3857 int tocopy;
3858 size_t toread;
3859 struct buffer_head *bh;
3860 loff_t i_size = i_size_read(inode);
3861
3862 if (off > i_size)
3863 return 0;
3864 if (off+len > i_size)
3865 len = i_size-off;
3866 toread = len;
3867 while (toread > 0) {
3868 tocopy = sb->s_blocksize - offset < toread ?
3869 sb->s_blocksize - offset : toread;
3870 bh = ext4_bread(NULL, inode, blk, 0, &err);
3871 if (err)
3872 return err;
3873 if (!bh) /* A hole? */
3874 memset(data, 0, tocopy);
3875 else
3876 memcpy(data, bh->b_data+offset, tocopy);
3877 brelse(bh);
3878 offset = 0;
3879 toread -= tocopy;
3880 data += tocopy;
3881 blk++;
3882 }
3883 return len;
3884 }
3885
3886 /* Write to quotafile (we know the transaction is already started and has
3887 * enough credits) */
3888 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3889 const char *data, size_t len, loff_t off)
3890 {
3891 struct inode *inode = sb_dqopt(sb)->files[type];
3892 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3893 int err = 0;
3894 int offset = off & (sb->s_blocksize - 1);
3895 int tocopy;
3896 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3897 size_t towrite = len;
3898 struct buffer_head *bh;
3899 handle_t *handle = journal_current_handle();
3900
3901 if (EXT4_SB(sb)->s_journal && !handle) {
3902 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3903 " cancelled because transaction is not started",
3904 (unsigned long long)off, (unsigned long long)len);
3905 return -EIO;
3906 }
3907 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3908 while (towrite > 0) {
3909 tocopy = sb->s_blocksize - offset < towrite ?
3910 sb->s_blocksize - offset : towrite;
3911 bh = ext4_bread(handle, inode, blk, 1, &err);
3912 if (!bh)
3913 goto out;
3914 if (journal_quota) {
3915 err = ext4_journal_get_write_access(handle, bh);
3916 if (err) {
3917 brelse(bh);
3918 goto out;
3919 }
3920 }
3921 lock_buffer(bh);
3922 memcpy(bh->b_data+offset, data, tocopy);
3923 flush_dcache_page(bh->b_page);
3924 unlock_buffer(bh);
3925 if (journal_quota)
3926 err = ext4_handle_dirty_metadata(handle, NULL, bh);
3927 else {
3928 /* Always do at least ordered writes for quotas */
3929 err = ext4_jbd2_file_inode(handle, inode);
3930 mark_buffer_dirty(bh);
3931 }
3932 brelse(bh);
3933 if (err)
3934 goto out;
3935 offset = 0;
3936 towrite -= tocopy;
3937 data += tocopy;
3938 blk++;
3939 }
3940 out:
3941 if (len == towrite) {
3942 mutex_unlock(&inode->i_mutex);
3943 return err;
3944 }
3945 if (inode->i_size < off+len-towrite) {
3946 i_size_write(inode, off+len-towrite);
3947 EXT4_I(inode)->i_disksize = inode->i_size;
3948 }
3949 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3950 ext4_mark_inode_dirty(handle, inode);
3951 mutex_unlock(&inode->i_mutex);
3952 return len - towrite;
3953 }
3954
3955 #endif
3956
3957 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3958 const char *dev_name, void *data, struct vfsmount *mnt)
3959 {
3960 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
3961 }
3962
3963 #if !defined(CONTIG_EXT2_FS) && defined(CONFIG_EXT4_USE_FOR_EXT23)
3964 static struct file_system_type ext2_fs_type = {
3965 .owner = THIS_MODULE,
3966 .name = "ext2",
3967 .get_sb = ext4_get_sb,
3968 .kill_sb = kill_block_super,
3969 .fs_flags = FS_REQUIRES_DEV,
3970 };
3971
3972 static inline void register_as_ext2(void)
3973 {
3974 int err = register_filesystem(&ext2_fs_type);
3975 if (err)
3976 printk(KERN_WARNING
3977 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
3978 }
3979
3980 static inline void unregister_as_ext2(void)
3981 {
3982 unregister_filesystem(&ext2_fs_type);
3983 }
3984 #else
3985 static inline void register_as_ext2(void) { }
3986 static inline void unregister_as_ext2(void) { }
3987 #endif
3988
3989 #if !defined(CONTIG_EXT3_FS) && defined(CONFIG_EXT4_USE_FOR_EXT23)
3990 static struct file_system_type ext3_fs_type = {
3991 .owner = THIS_MODULE,
3992 .name = "ext3",
3993 .get_sb = ext4_get_sb,
3994 .kill_sb = kill_block_super,
3995 .fs_flags = FS_REQUIRES_DEV,
3996 };
3997
3998 static inline void register_as_ext3(void)
3999 {
4000 int err = register_filesystem(&ext3_fs_type);
4001 if (err)
4002 printk(KERN_WARNING
4003 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4004 }
4005
4006 static inline void unregister_as_ext3(void)
4007 {
4008 unregister_filesystem(&ext3_fs_type);
4009 }
4010 #else
4011 static inline void register_as_ext3(void) { }
4012 static inline void unregister_as_ext3(void) { }
4013 #endif
4014
4015 static struct file_system_type ext4_fs_type = {
4016 .owner = THIS_MODULE,
4017 .name = "ext4",
4018 .get_sb = ext4_get_sb,
4019 .kill_sb = kill_block_super,
4020 .fs_flags = FS_REQUIRES_DEV,
4021 };
4022
4023 static int __init init_ext4_fs(void)
4024 {
4025 int err;
4026
4027 err = init_ext4_system_zone();
4028 if (err)
4029 return err;
4030 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4031 if (!ext4_kset)
4032 goto out4;
4033 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4034 err = init_ext4_mballoc();
4035 if (err)
4036 goto out3;
4037
4038 err = init_ext4_xattr();
4039 if (err)
4040 goto out2;
4041 err = init_inodecache();
4042 if (err)
4043 goto out1;
4044 register_as_ext2();
4045 register_as_ext3();
4046 err = register_filesystem(&ext4_fs_type);
4047 if (err)
4048 goto out;
4049 return 0;
4050 out:
4051 unregister_as_ext2();
4052 unregister_as_ext3();
4053 destroy_inodecache();
4054 out1:
4055 exit_ext4_xattr();
4056 out2:
4057 exit_ext4_mballoc();
4058 out3:
4059 remove_proc_entry("fs/ext4", NULL);
4060 kset_unregister(ext4_kset);
4061 out4:
4062 exit_ext4_system_zone();
4063 return err;
4064 }
4065
4066 static void __exit exit_ext4_fs(void)
4067 {
4068 unregister_as_ext2();
4069 unregister_as_ext3();
4070 unregister_filesystem(&ext4_fs_type);
4071 destroy_inodecache();
4072 exit_ext4_xattr();
4073 exit_ext4_mballoc();
4074 remove_proc_entry("fs/ext4", NULL);
4075 kset_unregister(ext4_kset);
4076 exit_ext4_system_zone();
4077 }
4078
4079 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4080 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4081 MODULE_LICENSE("GPL");
4082 module_init(init_ext4_fs)
4083 module_exit(exit_ext4_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree