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ALSA: hda - Add missing printk argument in previous patch
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blobba191dae87304e9106940dfe25e8af41573181ca
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 complain 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 void ext4_error_inode(const char *function, struct inode *inode,
351 const char *fmt, ...)
352 {
353 va_list args;
354
355 va_start(args, fmt);
356 printk(KERN_CRIT "EXT4-fs error (device %s): %s: inode #%lu: (comm %s) ",
357 inode->i_sb->s_id, function, inode->i_ino, current->comm);
358 vprintk(fmt, args);
359 printk("\n");
360 va_end(args);
361
362 ext4_handle_error(inode->i_sb);
363 }
364
365 void ext4_error_file(const char *function, struct file *file,
366 const char *fmt, ...)
367 {
368 va_list args;
369 struct inode *inode = file->f_dentry->d_inode;
370 char pathname[80], *path;
371
372 va_start(args, fmt);
373 path = d_path(&(file->f_path), pathname, sizeof(pathname));
374 if (!path)
375 path = "(unknown)";
376 printk(KERN_CRIT
377 "EXT4-fs error (device %s): %s: inode #%lu (comm %s path %s): ",
378 inode->i_sb->s_id, function, inode->i_ino, current->comm, path);
379 vprintk(fmt, args);
380 printk("\n");
381 va_end(args);
382
383 ext4_handle_error(inode->i_sb);
384 }
385
386 static const char *ext4_decode_error(struct super_block *sb, int errno,
387 char nbuf[16])
388 {
389 char *errstr = NULL;
390
391 switch (errno) {
392 case -EIO:
393 errstr = "IO failure";
394 break;
395 case -ENOMEM:
396 errstr = "Out of memory";
397 break;
398 case -EROFS:
399 if (!sb || (EXT4_SB(sb)->s_journal &&
400 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
401 errstr = "Journal has aborted";
402 else
403 errstr = "Readonly filesystem";
404 break;
405 default:
406 /* If the caller passed in an extra buffer for unknown
407 * errors, textualise them now. Else we just return
408 * NULL. */
409 if (nbuf) {
410 /* Check for truncated error codes... */
411 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
412 errstr = nbuf;
413 }
414 break;
415 }
416
417 return errstr;
418 }
419
420 /* __ext4_std_error decodes expected errors from journaling functions
421 * automatically and invokes the appropriate error response. */
422
423 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
424 {
425 char nbuf[16];
426 const char *errstr;
427
428 /* Special case: if the error is EROFS, and we're not already
429 * inside a transaction, then there's really no point in logging
430 * an error. */
431 if (errno == -EROFS && journal_current_handle() == NULL &&
432 (sb->s_flags & MS_RDONLY))
433 return;
434
435 errstr = ext4_decode_error(sb, errno, nbuf);
436 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
437 sb->s_id, function, errstr);
438
439 ext4_handle_error(sb);
440 }
441
442 /*
443 * ext4_abort is a much stronger failure handler than ext4_error. The
444 * abort function may be used to deal with unrecoverable failures such
445 * as journal IO errors or ENOMEM at a critical moment in log management.
446 *
447 * We unconditionally force the filesystem into an ABORT|READONLY state,
448 * unless the error response on the fs has been set to panic in which
449 * case we take the easy way out and panic immediately.
450 */
451
452 void ext4_abort(struct super_block *sb, const char *function,
453 const char *fmt, ...)
454 {
455 va_list args;
456
457 va_start(args, fmt);
458 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
459 vprintk(fmt, args);
460 printk("\n");
461 va_end(args);
462
463 if (test_opt(sb, ERRORS_PANIC))
464 panic("EXT4-fs panic from previous error\n");
465
466 if (sb->s_flags & MS_RDONLY)
467 return;
468
469 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
470 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
471 sb->s_flags |= MS_RDONLY;
472 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
473 if (EXT4_SB(sb)->s_journal)
474 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
475 }
476
477 void ext4_msg (struct super_block * sb, const char *prefix,
478 const char *fmt, ...)
479 {
480 va_list args;
481
482 va_start(args, fmt);
483 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
484 vprintk(fmt, args);
485 printk("\n");
486 va_end(args);
487 }
488
489 void __ext4_warning(struct super_block *sb, const char *function,
490 const char *fmt, ...)
491 {
492 va_list args;
493
494 va_start(args, fmt);
495 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
496 sb->s_id, function);
497 vprintk(fmt, args);
498 printk("\n");
499 va_end(args);
500 }
501
502 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
503 const char *function, const char *fmt, ...)
504 __releases(bitlock)
505 __acquires(bitlock)
506 {
507 va_list args;
508 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
509
510 va_start(args, fmt);
511 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
512 vprintk(fmt, args);
513 printk("\n");
514 va_end(args);
515
516 if (test_opt(sb, ERRORS_CONT)) {
517 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
518 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
519 ext4_commit_super(sb, 0);
520 return;
521 }
522 ext4_unlock_group(sb, grp);
523 ext4_handle_error(sb);
524 /*
525 * We only get here in the ERRORS_RO case; relocking the group
526 * may be dangerous, but nothing bad will happen since the
527 * filesystem will have already been marked read/only and the
528 * journal has been aborted. We return 1 as a hint to callers
529 * who might what to use the return value from
530 * ext4_grp_locked_error() to distinguish beween the
531 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
532 * aggressively from the ext4 function in question, with a
533 * more appropriate error code.
534 */
535 ext4_lock_group(sb, grp);
536 return;
537 }
538
539 void ext4_update_dynamic_rev(struct super_block *sb)
540 {
541 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
542
543 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
544 return;
545
546 ext4_warning(sb,
547 "updating to rev %d because of new feature flag, "
548 "running e2fsck is recommended",
549 EXT4_DYNAMIC_REV);
550
551 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
552 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
553 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
554 /* leave es->s_feature_*compat flags alone */
555 /* es->s_uuid will be set by e2fsck if empty */
556
557 /*
558 * The rest of the superblock fields should be zero, and if not it
559 * means they are likely already in use, so leave them alone. We
560 * can leave it up to e2fsck to clean up any inconsistencies there.
561 */
562 }
563
564 /*
565 * Open the external journal device
566 */
567 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
568 {
569 struct block_device *bdev;
570 char b[BDEVNAME_SIZE];
571
572 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
573 if (IS_ERR(bdev))
574 goto fail;
575 return bdev;
576
577 fail:
578 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
579 __bdevname(dev, b), PTR_ERR(bdev));
580 return NULL;
581 }
582
583 /*
584 * Release the journal device
585 */
586 static int ext4_blkdev_put(struct block_device *bdev)
587 {
588 bd_release(bdev);
589 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
590 }
591
592 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
593 {
594 struct block_device *bdev;
595 int ret = -ENODEV;
596
597 bdev = sbi->journal_bdev;
598 if (bdev) {
599 ret = ext4_blkdev_put(bdev);
600 sbi->journal_bdev = NULL;
601 }
602 return ret;
603 }
604
605 static inline struct inode *orphan_list_entry(struct list_head *l)
606 {
607 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
608 }
609
610 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
611 {
612 struct list_head *l;
613
614 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
615 le32_to_cpu(sbi->s_es->s_last_orphan));
616
617 printk(KERN_ERR "sb_info orphan list:\n");
618 list_for_each(l, &sbi->s_orphan) {
619 struct inode *inode = orphan_list_entry(l);
620 printk(KERN_ERR " "
621 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
622 inode->i_sb->s_id, inode->i_ino, inode,
623 inode->i_mode, inode->i_nlink,
624 NEXT_ORPHAN(inode));
625 }
626 }
627
628 static void ext4_put_super(struct super_block *sb)
629 {
630 struct ext4_sb_info *sbi = EXT4_SB(sb);
631 struct ext4_super_block *es = sbi->s_es;
632 int i, err;
633
634 flush_workqueue(sbi->dio_unwritten_wq);
635 destroy_workqueue(sbi->dio_unwritten_wq);
636
637 lock_super(sb);
638 lock_kernel();
639 if (sb->s_dirt)
640 ext4_commit_super(sb, 1);
641
642 if (sbi->s_journal) {
643 err = jbd2_journal_destroy(sbi->s_journal);
644 sbi->s_journal = NULL;
645 if (err < 0)
646 ext4_abort(sb, __func__,
647 "Couldn't clean up the journal");
648 }
649
650 ext4_release_system_zone(sb);
651 ext4_mb_release(sb);
652 ext4_ext_release(sb);
653 ext4_xattr_put_super(sb);
654
655 if (!(sb->s_flags & MS_RDONLY)) {
656 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
657 es->s_state = cpu_to_le16(sbi->s_mount_state);
658 ext4_commit_super(sb, 1);
659 }
660 if (sbi->s_proc) {
661 remove_proc_entry(sb->s_id, ext4_proc_root);
662 }
663 kobject_del(&sbi->s_kobj);
664
665 for (i = 0; i < sbi->s_gdb_count; i++)
666 brelse(sbi->s_group_desc[i]);
667 kfree(sbi->s_group_desc);
668 if (is_vmalloc_addr(sbi->s_flex_groups))
669 vfree(sbi->s_flex_groups);
670 else
671 kfree(sbi->s_flex_groups);
672 percpu_counter_destroy(&sbi->s_freeblocks_counter);
673 percpu_counter_destroy(&sbi->s_freeinodes_counter);
674 percpu_counter_destroy(&sbi->s_dirs_counter);
675 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
676 brelse(sbi->s_sbh);
677 #ifdef CONFIG_QUOTA
678 for (i = 0; i < MAXQUOTAS; i++)
679 kfree(sbi->s_qf_names[i]);
680 #endif
681
682 /* Debugging code just in case the in-memory inode orphan list
683 * isn't empty. The on-disk one can be non-empty if we've
684 * detected an error and taken the fs readonly, but the
685 * in-memory list had better be clean by this point. */
686 if (!list_empty(&sbi->s_orphan))
687 dump_orphan_list(sb, sbi);
688 J_ASSERT(list_empty(&sbi->s_orphan));
689
690 invalidate_bdev(sb->s_bdev);
691 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
692 /*
693 * Invalidate the journal device's buffers. We don't want them
694 * floating about in memory - the physical journal device may
695 * hotswapped, and it breaks the `ro-after' testing code.
696 */
697 sync_blockdev(sbi->journal_bdev);
698 invalidate_bdev(sbi->journal_bdev);
699 ext4_blkdev_remove(sbi);
700 }
701 sb->s_fs_info = NULL;
702 /*
703 * Now that we are completely done shutting down the
704 * superblock, we need to actually destroy the kobject.
705 */
706 unlock_kernel();
707 unlock_super(sb);
708 kobject_put(&sbi->s_kobj);
709 wait_for_completion(&sbi->s_kobj_unregister);
710 kfree(sbi->s_blockgroup_lock);
711 kfree(sbi);
712 }
713
714 static struct kmem_cache *ext4_inode_cachep;
715
716 /*
717 * Called inside transaction, so use GFP_NOFS
718 */
719 static struct inode *ext4_alloc_inode(struct super_block *sb)
720 {
721 struct ext4_inode_info *ei;
722
723 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
724 if (!ei)
725 return NULL;
726
727 ei->vfs_inode.i_version = 1;
728 ei->vfs_inode.i_data.writeback_index = 0;
729 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
730 INIT_LIST_HEAD(&ei->i_prealloc_list);
731 spin_lock_init(&ei->i_prealloc_lock);
732 /*
733 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
734 * therefore it can be null here. Don't check it, just initialize
735 * jinode.
736 */
737 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
738 ei->i_reserved_data_blocks = 0;
739 ei->i_reserved_meta_blocks = 0;
740 ei->i_allocated_meta_blocks = 0;
741 ei->i_da_metadata_calc_len = 0;
742 ei->i_delalloc_reserved_flag = 0;
743 spin_lock_init(&(ei->i_block_reservation_lock));
744 #ifdef CONFIG_QUOTA
745 ei->i_reserved_quota = 0;
746 #endif
747 INIT_LIST_HEAD(&ei->i_completed_io_list);
748 spin_lock_init(&ei->i_completed_io_lock);
749 ei->cur_aio_dio = NULL;
750 ei->i_sync_tid = 0;
751 ei->i_datasync_tid = 0;
752
753 return &ei->vfs_inode;
754 }
755
756 static void ext4_destroy_inode(struct inode *inode)
757 {
758 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
759 ext4_msg(inode->i_sb, KERN_ERR,
760 "Inode %lu (%p): orphan list check failed!",
761 inode->i_ino, EXT4_I(inode));
762 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
763 EXT4_I(inode), sizeof(struct ext4_inode_info),
764 true);
765 dump_stack();
766 }
767 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
768 }
769
770 static void init_once(void *foo)
771 {
772 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
773
774 INIT_LIST_HEAD(&ei->i_orphan);
775 #ifdef CONFIG_EXT4_FS_XATTR
776 init_rwsem(&ei->xattr_sem);
777 #endif
778 init_rwsem(&ei->i_data_sem);
779 inode_init_once(&ei->vfs_inode);
780 }
781
782 static int init_inodecache(void)
783 {
784 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
785 sizeof(struct ext4_inode_info),
786 0, (SLAB_RECLAIM_ACCOUNT|
787 SLAB_MEM_SPREAD),
788 init_once);
789 if (ext4_inode_cachep == NULL)
790 return -ENOMEM;
791 return 0;
792 }
793
794 static void destroy_inodecache(void)
795 {
796 kmem_cache_destroy(ext4_inode_cachep);
797 }
798
799 static void ext4_clear_inode(struct inode *inode)
800 {
801 dquot_drop(inode);
802 ext4_discard_preallocations(inode);
803 if (EXT4_JOURNAL(inode))
804 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
805 &EXT4_I(inode)->jinode);
806 }
807
808 static inline void ext4_show_quota_options(struct seq_file *seq,
809 struct super_block *sb)
810 {
811 #if defined(CONFIG_QUOTA)
812 struct ext4_sb_info *sbi = EXT4_SB(sb);
813
814 if (sbi->s_jquota_fmt) {
815 char *fmtname = "";
816
817 switch (sbi->s_jquota_fmt) {
818 case QFMT_VFS_OLD:
819 fmtname = "vfsold";
820 break;
821 case QFMT_VFS_V0:
822 fmtname = "vfsv0";
823 break;
824 case QFMT_VFS_V1:
825 fmtname = "vfsv1";
826 break;
827 }
828 seq_printf(seq, ",jqfmt=%s", fmtname);
829 }
830
831 if (sbi->s_qf_names[USRQUOTA])
832 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
833
834 if (sbi->s_qf_names[GRPQUOTA])
835 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
836
837 if (test_opt(sb, USRQUOTA))
838 seq_puts(seq, ",usrquota");
839
840 if (test_opt(sb, GRPQUOTA))
841 seq_puts(seq, ",grpquota");
842 #endif
843 }
844
845 /*
846 * Show an option if
847 * - it's set to a non-default value OR
848 * - if the per-sb default is different from the global default
849 */
850 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
851 {
852 int def_errors;
853 unsigned long def_mount_opts;
854 struct super_block *sb = vfs->mnt_sb;
855 struct ext4_sb_info *sbi = EXT4_SB(sb);
856 struct ext4_super_block *es = sbi->s_es;
857
858 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
859 def_errors = le16_to_cpu(es->s_errors);
860
861 if (sbi->s_sb_block != 1)
862 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
863 if (test_opt(sb, MINIX_DF))
864 seq_puts(seq, ",minixdf");
865 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
866 seq_puts(seq, ",grpid");
867 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
868 seq_puts(seq, ",nogrpid");
869 if (sbi->s_resuid != EXT4_DEF_RESUID ||
870 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
871 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
872 }
873 if (sbi->s_resgid != EXT4_DEF_RESGID ||
874 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
875 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
876 }
877 if (test_opt(sb, ERRORS_RO)) {
878 if (def_errors == EXT4_ERRORS_PANIC ||
879 def_errors == EXT4_ERRORS_CONTINUE) {
880 seq_puts(seq, ",errors=remount-ro");
881 }
882 }
883 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
884 seq_puts(seq, ",errors=continue");
885 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
886 seq_puts(seq, ",errors=panic");
887 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
888 seq_puts(seq, ",nouid32");
889 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
890 seq_puts(seq, ",debug");
891 if (test_opt(sb, OLDALLOC))
892 seq_puts(seq, ",oldalloc");
893 #ifdef CONFIG_EXT4_FS_XATTR
894 if (test_opt(sb, XATTR_USER) &&
895 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
896 seq_puts(seq, ",user_xattr");
897 if (!test_opt(sb, XATTR_USER) &&
898 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
899 seq_puts(seq, ",nouser_xattr");
900 }
901 #endif
902 #ifdef CONFIG_EXT4_FS_POSIX_ACL
903 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
904 seq_puts(seq, ",acl");
905 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
906 seq_puts(seq, ",noacl");
907 #endif
908 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
909 seq_printf(seq, ",commit=%u",
910 (unsigned) (sbi->s_commit_interval / HZ));
911 }
912 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
913 seq_printf(seq, ",min_batch_time=%u",
914 (unsigned) sbi->s_min_batch_time);
915 }
916 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
917 seq_printf(seq, ",max_batch_time=%u",
918 (unsigned) sbi->s_min_batch_time);
919 }
920
921 /*
922 * We're changing the default of barrier mount option, so
923 * let's always display its mount state so it's clear what its
924 * status is.
925 */
926 seq_puts(seq, ",barrier=");
927 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
928 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
929 seq_puts(seq, ",journal_async_commit");
930 if (test_opt(sb, NOBH))
931 seq_puts(seq, ",nobh");
932 if (test_opt(sb, I_VERSION))
933 seq_puts(seq, ",i_version");
934 if (!test_opt(sb, DELALLOC))
935 seq_puts(seq, ",nodelalloc");
936
937
938 if (sbi->s_stripe)
939 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
940 /*
941 * journal mode get enabled in different ways
942 * So just print the value even if we didn't specify it
943 */
944 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
945 seq_puts(seq, ",data=journal");
946 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
947 seq_puts(seq, ",data=ordered");
948 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
949 seq_puts(seq, ",data=writeback");
950
951 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
952 seq_printf(seq, ",inode_readahead_blks=%u",
953 sbi->s_inode_readahead_blks);
954
955 if (test_opt(sb, DATA_ERR_ABORT))
956 seq_puts(seq, ",data_err=abort");
957
958 if (test_opt(sb, NO_AUTO_DA_ALLOC))
959 seq_puts(seq, ",noauto_da_alloc");
960
961 if (test_opt(sb, DISCARD))
962 seq_puts(seq, ",discard");
963
964 if (test_opt(sb, NOLOAD))
965 seq_puts(seq, ",norecovery");
966
967 if (test_opt(sb, DIOREAD_NOLOCK))
968 seq_puts(seq, ",dioread_nolock");
969
970 ext4_show_quota_options(seq, sb);
971
972 return 0;
973 }
974
975 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
976 u64 ino, u32 generation)
977 {
978 struct inode *inode;
979
980 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
981 return ERR_PTR(-ESTALE);
982 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
983 return ERR_PTR(-ESTALE);
984
985 /* iget isn't really right if the inode is currently unallocated!!
986 *
987 * ext4_read_inode will return a bad_inode if the inode had been
988 * deleted, so we should be safe.
989 *
990 * Currently we don't know the generation for parent directory, so
991 * a generation of 0 means "accept any"
992 */
993 inode = ext4_iget(sb, ino);
994 if (IS_ERR(inode))
995 return ERR_CAST(inode);
996 if (generation && inode->i_generation != generation) {
997 iput(inode);
998 return ERR_PTR(-ESTALE);
999 }
1000
1001 return inode;
1002 }
1003
1004 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1005 int fh_len, int fh_type)
1006 {
1007 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1008 ext4_nfs_get_inode);
1009 }
1010
1011 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1012 int fh_len, int fh_type)
1013 {
1014 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1015 ext4_nfs_get_inode);
1016 }
1017
1018 /*
1019 * Try to release metadata pages (indirect blocks, directories) which are
1020 * mapped via the block device. Since these pages could have journal heads
1021 * which would prevent try_to_free_buffers() from freeing them, we must use
1022 * jbd2 layer's try_to_free_buffers() function to release them.
1023 */
1024 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1025 gfp_t wait)
1026 {
1027 journal_t *journal = EXT4_SB(sb)->s_journal;
1028
1029 WARN_ON(PageChecked(page));
1030 if (!page_has_buffers(page))
1031 return 0;
1032 if (journal)
1033 return jbd2_journal_try_to_free_buffers(journal, page,
1034 wait & ~__GFP_WAIT);
1035 return try_to_free_buffers(page);
1036 }
1037
1038 #ifdef CONFIG_QUOTA
1039 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1040 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1041
1042 static int ext4_write_dquot(struct dquot *dquot);
1043 static int ext4_acquire_dquot(struct dquot *dquot);
1044 static int ext4_release_dquot(struct dquot *dquot);
1045 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1046 static int ext4_write_info(struct super_block *sb, int type);
1047 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1048 char *path, int remount);
1049 static int ext4_quota_on_mount(struct super_block *sb, int type);
1050 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1051 size_t len, loff_t off);
1052 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1053 const char *data, size_t len, loff_t off);
1054
1055 static const struct dquot_operations ext4_quota_operations = {
1056 #ifdef CONFIG_QUOTA
1057 .get_reserved_space = ext4_get_reserved_space,
1058 #endif
1059 .write_dquot = ext4_write_dquot,
1060 .acquire_dquot = ext4_acquire_dquot,
1061 .release_dquot = ext4_release_dquot,
1062 .mark_dirty = ext4_mark_dquot_dirty,
1063 .write_info = ext4_write_info,
1064 .alloc_dquot = dquot_alloc,
1065 .destroy_dquot = dquot_destroy,
1066 };
1067
1068 static const struct quotactl_ops ext4_qctl_operations = {
1069 .quota_on = ext4_quota_on,
1070 .quota_off = vfs_quota_off,
1071 .quota_sync = vfs_quota_sync,
1072 .get_info = vfs_get_dqinfo,
1073 .set_info = vfs_set_dqinfo,
1074 .get_dqblk = vfs_get_dqblk,
1075 .set_dqblk = vfs_set_dqblk
1076 };
1077 #endif
1078
1079 static const struct super_operations ext4_sops = {
1080 .alloc_inode = ext4_alloc_inode,
1081 .destroy_inode = ext4_destroy_inode,
1082 .write_inode = ext4_write_inode,
1083 .dirty_inode = ext4_dirty_inode,
1084 .delete_inode = ext4_delete_inode,
1085 .put_super = ext4_put_super,
1086 .sync_fs = ext4_sync_fs,
1087 .freeze_fs = ext4_freeze,
1088 .unfreeze_fs = ext4_unfreeze,
1089 .statfs = ext4_statfs,
1090 .remount_fs = ext4_remount,
1091 .clear_inode = ext4_clear_inode,
1092 .show_options = ext4_show_options,
1093 #ifdef CONFIG_QUOTA
1094 .quota_read = ext4_quota_read,
1095 .quota_write = ext4_quota_write,
1096 #endif
1097 .bdev_try_to_free_page = bdev_try_to_free_page,
1098 };
1099
1100 static const struct super_operations ext4_nojournal_sops = {
1101 .alloc_inode = ext4_alloc_inode,
1102 .destroy_inode = ext4_destroy_inode,
1103 .write_inode = ext4_write_inode,
1104 .dirty_inode = ext4_dirty_inode,
1105 .delete_inode = ext4_delete_inode,
1106 .write_super = ext4_write_super,
1107 .put_super = ext4_put_super,
1108 .statfs = ext4_statfs,
1109 .remount_fs = ext4_remount,
1110 .clear_inode = ext4_clear_inode,
1111 .show_options = ext4_show_options,
1112 #ifdef CONFIG_QUOTA
1113 .quota_read = ext4_quota_read,
1114 .quota_write = ext4_quota_write,
1115 #endif
1116 .bdev_try_to_free_page = bdev_try_to_free_page,
1117 };
1118
1119 static const struct export_operations ext4_export_ops = {
1120 .fh_to_dentry = ext4_fh_to_dentry,
1121 .fh_to_parent = ext4_fh_to_parent,
1122 .get_parent = ext4_get_parent,
1123 };
1124
1125 enum {
1126 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1127 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1128 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1129 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1130 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1131 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1132 Opt_journal_update, Opt_journal_dev,
1133 Opt_journal_checksum, Opt_journal_async_commit,
1134 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1135 Opt_data_err_abort, Opt_data_err_ignore,
1136 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1137 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1138 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1139 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1140 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1141 Opt_block_validity, Opt_noblock_validity,
1142 Opt_inode_readahead_blks, Opt_journal_ioprio,
1143 Opt_dioread_nolock, Opt_dioread_lock,
1144 Opt_discard, Opt_nodiscard,
1145 };
1146
1147 static const match_table_t tokens = {
1148 {Opt_bsd_df, "bsddf"},
1149 {Opt_minix_df, "minixdf"},
1150 {Opt_grpid, "grpid"},
1151 {Opt_grpid, "bsdgroups"},
1152 {Opt_nogrpid, "nogrpid"},
1153 {Opt_nogrpid, "sysvgroups"},
1154 {Opt_resgid, "resgid=%u"},
1155 {Opt_resuid, "resuid=%u"},
1156 {Opt_sb, "sb=%u"},
1157 {Opt_err_cont, "errors=continue"},
1158 {Opt_err_panic, "errors=panic"},
1159 {Opt_err_ro, "errors=remount-ro"},
1160 {Opt_nouid32, "nouid32"},
1161 {Opt_debug, "debug"},
1162 {Opt_oldalloc, "oldalloc"},
1163 {Opt_orlov, "orlov"},
1164 {Opt_user_xattr, "user_xattr"},
1165 {Opt_nouser_xattr, "nouser_xattr"},
1166 {Opt_acl, "acl"},
1167 {Opt_noacl, "noacl"},
1168 {Opt_noload, "noload"},
1169 {Opt_noload, "norecovery"},
1170 {Opt_nobh, "nobh"},
1171 {Opt_bh, "bh"},
1172 {Opt_commit, "commit=%u"},
1173 {Opt_min_batch_time, "min_batch_time=%u"},
1174 {Opt_max_batch_time, "max_batch_time=%u"},
1175 {Opt_journal_update, "journal=update"},
1176 {Opt_journal_dev, "journal_dev=%u"},
1177 {Opt_journal_checksum, "journal_checksum"},
1178 {Opt_journal_async_commit, "journal_async_commit"},
1179 {Opt_abort, "abort"},
1180 {Opt_data_journal, "data=journal"},
1181 {Opt_data_ordered, "data=ordered"},
1182 {Opt_data_writeback, "data=writeback"},
1183 {Opt_data_err_abort, "data_err=abort"},
1184 {Opt_data_err_ignore, "data_err=ignore"},
1185 {Opt_offusrjquota, "usrjquota="},
1186 {Opt_usrjquota, "usrjquota=%s"},
1187 {Opt_offgrpjquota, "grpjquota="},
1188 {Opt_grpjquota, "grpjquota=%s"},
1189 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1190 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1191 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1192 {Opt_grpquota, "grpquota"},
1193 {Opt_noquota, "noquota"},
1194 {Opt_quota, "quota"},
1195 {Opt_usrquota, "usrquota"},
1196 {Opt_barrier, "barrier=%u"},
1197 {Opt_barrier, "barrier"},
1198 {Opt_nobarrier, "nobarrier"},
1199 {Opt_i_version, "i_version"},
1200 {Opt_stripe, "stripe=%u"},
1201 {Opt_resize, "resize"},
1202 {Opt_delalloc, "delalloc"},
1203 {Opt_nodelalloc, "nodelalloc"},
1204 {Opt_block_validity, "block_validity"},
1205 {Opt_noblock_validity, "noblock_validity"},
1206 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1207 {Opt_journal_ioprio, "journal_ioprio=%u"},
1208 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1209 {Opt_auto_da_alloc, "auto_da_alloc"},
1210 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1211 {Opt_dioread_nolock, "dioread_nolock"},
1212 {Opt_dioread_lock, "dioread_lock"},
1213 {Opt_discard, "discard"},
1214 {Opt_nodiscard, "nodiscard"},
1215 {Opt_err, NULL},
1216 };
1217
1218 static ext4_fsblk_t get_sb_block(void **data)
1219 {
1220 ext4_fsblk_t sb_block;
1221 char *options = (char *) *data;
1222
1223 if (!options || strncmp(options, "sb=", 3) != 0)
1224 return 1; /* Default location */
1225
1226 options += 3;
1227 /* TODO: use simple_strtoll with >32bit ext4 */
1228 sb_block = simple_strtoul(options, &options, 0);
1229 if (*options && *options != ',') {
1230 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1231 (char *) *data);
1232 return 1;
1233 }
1234 if (*options == ',')
1235 options++;
1236 *data = (void *) options;
1237
1238 return sb_block;
1239 }
1240
1241 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1242 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1243 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1244
1245 #ifdef CONFIG_QUOTA
1246 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1247 {
1248 struct ext4_sb_info *sbi = EXT4_SB(sb);
1249 char *qname;
1250
1251 if (sb_any_quota_loaded(sb) &&
1252 !sbi->s_qf_names[qtype]) {
1253 ext4_msg(sb, KERN_ERR,
1254 "Cannot change journaled "
1255 "quota options when quota turned on");
1256 return 0;
1257 }
1258 qname = match_strdup(args);
1259 if (!qname) {
1260 ext4_msg(sb, KERN_ERR,
1261 "Not enough memory for storing quotafile name");
1262 return 0;
1263 }
1264 if (sbi->s_qf_names[qtype] &&
1265 strcmp(sbi->s_qf_names[qtype], qname)) {
1266 ext4_msg(sb, KERN_ERR,
1267 "%s quota file already specified", QTYPE2NAME(qtype));
1268 kfree(qname);
1269 return 0;
1270 }
1271 sbi->s_qf_names[qtype] = qname;
1272 if (strchr(sbi->s_qf_names[qtype], '/')) {
1273 ext4_msg(sb, KERN_ERR,
1274 "quotafile must be on filesystem root");
1275 kfree(sbi->s_qf_names[qtype]);
1276 sbi->s_qf_names[qtype] = NULL;
1277 return 0;
1278 }
1279 set_opt(sbi->s_mount_opt, QUOTA);
1280 return 1;
1281 }
1282
1283 static int clear_qf_name(struct super_block *sb, int qtype)
1284 {
1285
1286 struct ext4_sb_info *sbi = EXT4_SB(sb);
1287
1288 if (sb_any_quota_loaded(sb) &&
1289 sbi->s_qf_names[qtype]) {
1290 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1291 " when quota turned on");
1292 return 0;
1293 }
1294 /*
1295 * The space will be released later when all options are confirmed
1296 * to be correct
1297 */
1298 sbi->s_qf_names[qtype] = NULL;
1299 return 1;
1300 }
1301 #endif
1302
1303 static int parse_options(char *options, struct super_block *sb,
1304 unsigned long *journal_devnum,
1305 unsigned int *journal_ioprio,
1306 ext4_fsblk_t *n_blocks_count, int is_remount)
1307 {
1308 struct ext4_sb_info *sbi = EXT4_SB(sb);
1309 char *p;
1310 substring_t args[MAX_OPT_ARGS];
1311 int data_opt = 0;
1312 int option;
1313 #ifdef CONFIG_QUOTA
1314 int qfmt;
1315 #endif
1316
1317 if (!options)
1318 return 1;
1319
1320 while ((p = strsep(&options, ",")) != NULL) {
1321 int token;
1322 if (!*p)
1323 continue;
1324
1325 /*
1326 * Initialize args struct so we know whether arg was
1327 * found; some options take optional arguments.
1328 */
1329 args[0].to = args[0].from = 0;
1330 token = match_token(p, tokens, args);
1331 switch (token) {
1332 case Opt_bsd_df:
1333 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1334 clear_opt(sbi->s_mount_opt, MINIX_DF);
1335 break;
1336 case Opt_minix_df:
1337 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1338 set_opt(sbi->s_mount_opt, MINIX_DF);
1339
1340 break;
1341 case Opt_grpid:
1342 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1343 set_opt(sbi->s_mount_opt, GRPID);
1344
1345 break;
1346 case Opt_nogrpid:
1347 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1348 clear_opt(sbi->s_mount_opt, GRPID);
1349
1350 break;
1351 case Opt_resuid:
1352 if (match_int(&args[0], &option))
1353 return 0;
1354 sbi->s_resuid = option;
1355 break;
1356 case Opt_resgid:
1357 if (match_int(&args[0], &option))
1358 return 0;
1359 sbi->s_resgid = option;
1360 break;
1361 case Opt_sb:
1362 /* handled by get_sb_block() instead of here */
1363 /* *sb_block = match_int(&args[0]); */
1364 break;
1365 case Opt_err_panic:
1366 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1367 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1368 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1369 break;
1370 case Opt_err_ro:
1371 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1372 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1373 set_opt(sbi->s_mount_opt, ERRORS_RO);
1374 break;
1375 case Opt_err_cont:
1376 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1377 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1378 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1379 break;
1380 case Opt_nouid32:
1381 set_opt(sbi->s_mount_opt, NO_UID32);
1382 break;
1383 case Opt_debug:
1384 set_opt(sbi->s_mount_opt, DEBUG);
1385 break;
1386 case Opt_oldalloc:
1387 set_opt(sbi->s_mount_opt, OLDALLOC);
1388 break;
1389 case Opt_orlov:
1390 clear_opt(sbi->s_mount_opt, OLDALLOC);
1391 break;
1392 #ifdef CONFIG_EXT4_FS_XATTR
1393 case Opt_user_xattr:
1394 set_opt(sbi->s_mount_opt, XATTR_USER);
1395 break;
1396 case Opt_nouser_xattr:
1397 clear_opt(sbi->s_mount_opt, XATTR_USER);
1398 break;
1399 #else
1400 case Opt_user_xattr:
1401 case Opt_nouser_xattr:
1402 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1403 break;
1404 #endif
1405 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1406 case Opt_acl:
1407 set_opt(sbi->s_mount_opt, POSIX_ACL);
1408 break;
1409 case Opt_noacl:
1410 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1411 break;
1412 #else
1413 case Opt_acl:
1414 case Opt_noacl:
1415 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1416 break;
1417 #endif
1418 case Opt_journal_update:
1419 /* @@@ FIXME */
1420 /* Eventually we will want to be able to create
1421 a journal file here. For now, only allow the
1422 user to specify an existing inode to be the
1423 journal file. */
1424 if (is_remount) {
1425 ext4_msg(sb, KERN_ERR,
1426 "Cannot specify journal on remount");
1427 return 0;
1428 }
1429 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1430 break;
1431 case Opt_journal_dev:
1432 if (is_remount) {
1433 ext4_msg(sb, KERN_ERR,
1434 "Cannot specify journal on remount");
1435 return 0;
1436 }
1437 if (match_int(&args[0], &option))
1438 return 0;
1439 *journal_devnum = option;
1440 break;
1441 case Opt_journal_checksum:
1442 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1443 break;
1444 case Opt_journal_async_commit:
1445 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1446 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1447 break;
1448 case Opt_noload:
1449 set_opt(sbi->s_mount_opt, NOLOAD);
1450 break;
1451 case Opt_commit:
1452 if (match_int(&args[0], &option))
1453 return 0;
1454 if (option < 0)
1455 return 0;
1456 if (option == 0)
1457 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1458 sbi->s_commit_interval = HZ * option;
1459 break;
1460 case Opt_max_batch_time:
1461 if (match_int(&args[0], &option))
1462 return 0;
1463 if (option < 0)
1464 return 0;
1465 if (option == 0)
1466 option = EXT4_DEF_MAX_BATCH_TIME;
1467 sbi->s_max_batch_time = option;
1468 break;
1469 case Opt_min_batch_time:
1470 if (match_int(&args[0], &option))
1471 return 0;
1472 if (option < 0)
1473 return 0;
1474 sbi->s_min_batch_time = option;
1475 break;
1476 case Opt_data_journal:
1477 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1478 goto datacheck;
1479 case Opt_data_ordered:
1480 data_opt = EXT4_MOUNT_ORDERED_DATA;
1481 goto datacheck;
1482 case Opt_data_writeback:
1483 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1484 datacheck:
1485 if (is_remount) {
1486 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1487 ext4_msg(sb, KERN_ERR,
1488 "Cannot change data mode on remount");
1489 return 0;
1490 }
1491 } else {
1492 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1493 sbi->s_mount_opt |= data_opt;
1494 }
1495 break;
1496 case Opt_data_err_abort:
1497 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1498 break;
1499 case Opt_data_err_ignore:
1500 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1501 break;
1502 #ifdef CONFIG_QUOTA
1503 case Opt_usrjquota:
1504 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1505 return 0;
1506 break;
1507 case Opt_grpjquota:
1508 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1509 return 0;
1510 break;
1511 case Opt_offusrjquota:
1512 if (!clear_qf_name(sb, USRQUOTA))
1513 return 0;
1514 break;
1515 case Opt_offgrpjquota:
1516 if (!clear_qf_name(sb, GRPQUOTA))
1517 return 0;
1518 break;
1519
1520 case Opt_jqfmt_vfsold:
1521 qfmt = QFMT_VFS_OLD;
1522 goto set_qf_format;
1523 case Opt_jqfmt_vfsv0:
1524 qfmt = QFMT_VFS_V0;
1525 goto set_qf_format;
1526 case Opt_jqfmt_vfsv1:
1527 qfmt = QFMT_VFS_V1;
1528 set_qf_format:
1529 if (sb_any_quota_loaded(sb) &&
1530 sbi->s_jquota_fmt != qfmt) {
1531 ext4_msg(sb, KERN_ERR, "Cannot change "
1532 "journaled quota options when "
1533 "quota turned on");
1534 return 0;
1535 }
1536 sbi->s_jquota_fmt = qfmt;
1537 break;
1538 case Opt_quota:
1539 case Opt_usrquota:
1540 set_opt(sbi->s_mount_opt, QUOTA);
1541 set_opt(sbi->s_mount_opt, USRQUOTA);
1542 break;
1543 case Opt_grpquota:
1544 set_opt(sbi->s_mount_opt, QUOTA);
1545 set_opt(sbi->s_mount_opt, GRPQUOTA);
1546 break;
1547 case Opt_noquota:
1548 if (sb_any_quota_loaded(sb)) {
1549 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1550 "options when quota turned on");
1551 return 0;
1552 }
1553 clear_opt(sbi->s_mount_opt, QUOTA);
1554 clear_opt(sbi->s_mount_opt, USRQUOTA);
1555 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1556 break;
1557 #else
1558 case Opt_quota:
1559 case Opt_usrquota:
1560 case Opt_grpquota:
1561 ext4_msg(sb, KERN_ERR,
1562 "quota options not supported");
1563 break;
1564 case Opt_usrjquota:
1565 case Opt_grpjquota:
1566 case Opt_offusrjquota:
1567 case Opt_offgrpjquota:
1568 case Opt_jqfmt_vfsold:
1569 case Opt_jqfmt_vfsv0:
1570 case Opt_jqfmt_vfsv1:
1571 ext4_msg(sb, KERN_ERR,
1572 "journaled quota options not supported");
1573 break;
1574 case Opt_noquota:
1575 break;
1576 #endif
1577 case Opt_abort:
1578 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1579 break;
1580 case Opt_nobarrier:
1581 clear_opt(sbi->s_mount_opt, BARRIER);
1582 break;
1583 case Opt_barrier:
1584 if (args[0].from) {
1585 if (match_int(&args[0], &option))
1586 return 0;
1587 } else
1588 option = 1; /* No argument, default to 1 */
1589 if (option)
1590 set_opt(sbi->s_mount_opt, BARRIER);
1591 else
1592 clear_opt(sbi->s_mount_opt, BARRIER);
1593 break;
1594 case Opt_ignore:
1595 break;
1596 case Opt_resize:
1597 if (!is_remount) {
1598 ext4_msg(sb, KERN_ERR,
1599 "resize option only available "
1600 "for remount");
1601 return 0;
1602 }
1603 if (match_int(&args[0], &option) != 0)
1604 return 0;
1605 *n_blocks_count = option;
1606 break;
1607 case Opt_nobh:
1608 set_opt(sbi->s_mount_opt, NOBH);
1609 break;
1610 case Opt_bh:
1611 clear_opt(sbi->s_mount_opt, NOBH);
1612 break;
1613 case Opt_i_version:
1614 set_opt(sbi->s_mount_opt, I_VERSION);
1615 sb->s_flags |= MS_I_VERSION;
1616 break;
1617 case Opt_nodelalloc:
1618 clear_opt(sbi->s_mount_opt, DELALLOC);
1619 break;
1620 case Opt_stripe:
1621 if (match_int(&args[0], &option))
1622 return 0;
1623 if (option < 0)
1624 return 0;
1625 sbi->s_stripe = option;
1626 break;
1627 case Opt_delalloc:
1628 set_opt(sbi->s_mount_opt, DELALLOC);
1629 break;
1630 case Opt_block_validity:
1631 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1632 break;
1633 case Opt_noblock_validity:
1634 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1635 break;
1636 case Opt_inode_readahead_blks:
1637 if (match_int(&args[0], &option))
1638 return 0;
1639 if (option < 0 || option > (1 << 30))
1640 return 0;
1641 if (!is_power_of_2(option)) {
1642 ext4_msg(sb, KERN_ERR,
1643 "EXT4-fs: inode_readahead_blks"
1644 " must be a power of 2");
1645 return 0;
1646 }
1647 sbi->s_inode_readahead_blks = option;
1648 break;
1649 case Opt_journal_ioprio:
1650 if (match_int(&args[0], &option))
1651 return 0;
1652 if (option < 0 || option > 7)
1653 break;
1654 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1655 option);
1656 break;
1657 case Opt_noauto_da_alloc:
1658 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1659 break;
1660 case Opt_auto_da_alloc:
1661 if (args[0].from) {
1662 if (match_int(&args[0], &option))
1663 return 0;
1664 } else
1665 option = 1; /* No argument, default to 1 */
1666 if (option)
1667 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1668 else
1669 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1670 break;
1671 case Opt_discard:
1672 set_opt(sbi->s_mount_opt, DISCARD);
1673 break;
1674 case Opt_nodiscard:
1675 clear_opt(sbi->s_mount_opt, DISCARD);
1676 break;
1677 case Opt_dioread_nolock:
1678 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1679 break;
1680 case Opt_dioread_lock:
1681 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1682 break;
1683 default:
1684 ext4_msg(sb, KERN_ERR,
1685 "Unrecognized mount option \"%s\" "
1686 "or missing value", p);
1687 return 0;
1688 }
1689 }
1690 #ifdef CONFIG_QUOTA
1691 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1692 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1693 clear_opt(sbi->s_mount_opt, USRQUOTA);
1694
1695 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1696 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1697
1698 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1699 ext4_msg(sb, KERN_ERR, "old and new quota "
1700 "format mixing");
1701 return 0;
1702 }
1703
1704 if (!sbi->s_jquota_fmt) {
1705 ext4_msg(sb, KERN_ERR, "journaled quota format "
1706 "not specified");
1707 return 0;
1708 }
1709 } else {
1710 if (sbi->s_jquota_fmt) {
1711 ext4_msg(sb, KERN_ERR, "journaled quota format "
1712 "specified with no journaling "
1713 "enabled");
1714 return 0;
1715 }
1716 }
1717 #endif
1718 return 1;
1719 }
1720
1721 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1722 int read_only)
1723 {
1724 struct ext4_sb_info *sbi = EXT4_SB(sb);
1725 int res = 0;
1726
1727 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1728 ext4_msg(sb, KERN_ERR, "revision level too high, "
1729 "forcing read-only mode");
1730 res = MS_RDONLY;
1731 }
1732 if (read_only)
1733 return res;
1734 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1735 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1736 "running e2fsck is recommended");
1737 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1738 ext4_msg(sb, KERN_WARNING,
1739 "warning: mounting fs with errors, "
1740 "running e2fsck is recommended");
1741 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1742 le16_to_cpu(es->s_mnt_count) >=
1743 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1744 ext4_msg(sb, KERN_WARNING,
1745 "warning: maximal mount count reached, "
1746 "running e2fsck is recommended");
1747 else if (le32_to_cpu(es->s_checkinterval) &&
1748 (le32_to_cpu(es->s_lastcheck) +
1749 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1750 ext4_msg(sb, KERN_WARNING,
1751 "warning: checktime reached, "
1752 "running e2fsck is recommended");
1753 if (!sbi->s_journal)
1754 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1755 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1756 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1757 le16_add_cpu(&es->s_mnt_count, 1);
1758 es->s_mtime = cpu_to_le32(get_seconds());
1759 ext4_update_dynamic_rev(sb);
1760 if (sbi->s_journal)
1761 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1762
1763 ext4_commit_super(sb, 1);
1764 if (test_opt(sb, DEBUG))
1765 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1766 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1767 sb->s_blocksize,
1768 sbi->s_groups_count,
1769 EXT4_BLOCKS_PER_GROUP(sb),
1770 EXT4_INODES_PER_GROUP(sb),
1771 sbi->s_mount_opt);
1772
1773 return res;
1774 }
1775
1776 static int ext4_fill_flex_info(struct super_block *sb)
1777 {
1778 struct ext4_sb_info *sbi = EXT4_SB(sb);
1779 struct ext4_group_desc *gdp = NULL;
1780 ext4_group_t flex_group_count;
1781 ext4_group_t flex_group;
1782 int groups_per_flex = 0;
1783 size_t size;
1784 int i;
1785
1786 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1787 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1788
1789 if (groups_per_flex < 2) {
1790 sbi->s_log_groups_per_flex = 0;
1791 return 1;
1792 }
1793
1794 /* We allocate both existing and potentially added groups */
1795 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1796 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1797 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1798 size = flex_group_count * sizeof(struct flex_groups);
1799 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1800 if (sbi->s_flex_groups == NULL) {
1801 sbi->s_flex_groups = vmalloc(size);
1802 if (sbi->s_flex_groups)
1803 memset(sbi->s_flex_groups, 0, size);
1804 }
1805 if (sbi->s_flex_groups == NULL) {
1806 ext4_msg(sb, KERN_ERR, "not enough memory for "
1807 "%u flex groups", flex_group_count);
1808 goto failed;
1809 }
1810
1811 for (i = 0; i < sbi->s_groups_count; i++) {
1812 gdp = ext4_get_group_desc(sb, i, NULL);
1813
1814 flex_group = ext4_flex_group(sbi, i);
1815 atomic_add(ext4_free_inodes_count(sb, gdp),
1816 &sbi->s_flex_groups[flex_group].free_inodes);
1817 atomic_add(ext4_free_blks_count(sb, gdp),
1818 &sbi->s_flex_groups[flex_group].free_blocks);
1819 atomic_add(ext4_used_dirs_count(sb, gdp),
1820 &sbi->s_flex_groups[flex_group].used_dirs);
1821 }
1822
1823 return 1;
1824 failed:
1825 return 0;
1826 }
1827
1828 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1829 struct ext4_group_desc *gdp)
1830 {
1831 __u16 crc = 0;
1832
1833 if (sbi->s_es->s_feature_ro_compat &
1834 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1835 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1836 __le32 le_group = cpu_to_le32(block_group);
1837
1838 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1839 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1840 crc = crc16(crc, (__u8 *)gdp, offset);
1841 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1842 /* for checksum of struct ext4_group_desc do the rest...*/
1843 if ((sbi->s_es->s_feature_incompat &
1844 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1845 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1846 crc = crc16(crc, (__u8 *)gdp + offset,
1847 le16_to_cpu(sbi->s_es->s_desc_size) -
1848 offset);
1849 }
1850
1851 return cpu_to_le16(crc);
1852 }
1853
1854 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1855 struct ext4_group_desc *gdp)
1856 {
1857 if ((sbi->s_es->s_feature_ro_compat &
1858 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1859 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1860 return 0;
1861
1862 return 1;
1863 }
1864
1865 /* Called at mount-time, super-block is locked */
1866 static int ext4_check_descriptors(struct super_block *sb)
1867 {
1868 struct ext4_sb_info *sbi = EXT4_SB(sb);
1869 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1870 ext4_fsblk_t last_block;
1871 ext4_fsblk_t block_bitmap;
1872 ext4_fsblk_t inode_bitmap;
1873 ext4_fsblk_t inode_table;
1874 int flexbg_flag = 0;
1875 ext4_group_t i;
1876
1877 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1878 flexbg_flag = 1;
1879
1880 ext4_debug("Checking group descriptors");
1881
1882 for (i = 0; i < sbi->s_groups_count; i++) {
1883 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1884
1885 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1886 last_block = ext4_blocks_count(sbi->s_es) - 1;
1887 else
1888 last_block = first_block +
1889 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1890
1891 block_bitmap = ext4_block_bitmap(sb, gdp);
1892 if (block_bitmap < first_block || block_bitmap > last_block) {
1893 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1894 "Block bitmap for group %u not in group "
1895 "(block %llu)!", i, block_bitmap);
1896 return 0;
1897 }
1898 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1899 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1900 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1901 "Inode bitmap for group %u not in group "
1902 "(block %llu)!", i, inode_bitmap);
1903 return 0;
1904 }
1905 inode_table = ext4_inode_table(sb, gdp);
1906 if (inode_table < first_block ||
1907 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1908 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1909 "Inode table for group %u not in group "
1910 "(block %llu)!", i, inode_table);
1911 return 0;
1912 }
1913 ext4_lock_group(sb, i);
1914 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1915 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1916 "Checksum for group %u failed (%u!=%u)",
1917 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1918 gdp)), le16_to_cpu(gdp->bg_checksum));
1919 if (!(sb->s_flags & MS_RDONLY)) {
1920 ext4_unlock_group(sb, i);
1921 return 0;
1922 }
1923 }
1924 ext4_unlock_group(sb, i);
1925 if (!flexbg_flag)
1926 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1927 }
1928
1929 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1930 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
1931 return 1;
1932 }
1933
1934 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1935 * the superblock) which were deleted from all directories, but held open by
1936 * a process at the time of a crash. We walk the list and try to delete these
1937 * inodes at recovery time (only with a read-write filesystem).
1938 *
1939 * In order to keep the orphan inode chain consistent during traversal (in
1940 * case of crash during recovery), we link each inode into the superblock
1941 * orphan list_head and handle it the same way as an inode deletion during
1942 * normal operation (which journals the operations for us).
1943 *
1944 * We only do an iget() and an iput() on each inode, which is very safe if we
1945 * accidentally point at an in-use or already deleted inode. The worst that
1946 * can happen in this case is that we get a "bit already cleared" message from
1947 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1948 * e2fsck was run on this filesystem, and it must have already done the orphan
1949 * inode cleanup for us, so we can safely abort without any further action.
1950 */
1951 static void ext4_orphan_cleanup(struct super_block *sb,
1952 struct ext4_super_block *es)
1953 {
1954 unsigned int s_flags = sb->s_flags;
1955 int nr_orphans = 0, nr_truncates = 0;
1956 #ifdef CONFIG_QUOTA
1957 int i;
1958 #endif
1959 if (!es->s_last_orphan) {
1960 jbd_debug(4, "no orphan inodes to clean up\n");
1961 return;
1962 }
1963
1964 if (bdev_read_only(sb->s_bdev)) {
1965 ext4_msg(sb, KERN_ERR, "write access "
1966 "unavailable, skipping orphan cleanup");
1967 return;
1968 }
1969
1970 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1971 if (es->s_last_orphan)
1972 jbd_debug(1, "Errors on filesystem, "
1973 "clearing orphan list.\n");
1974 es->s_last_orphan = 0;
1975 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1976 return;
1977 }
1978
1979 if (s_flags & MS_RDONLY) {
1980 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1981 sb->s_flags &= ~MS_RDONLY;
1982 }
1983 #ifdef CONFIG_QUOTA
1984 /* Needed for iput() to work correctly and not trash data */
1985 sb->s_flags |= MS_ACTIVE;
1986 /* Turn on quotas so that they are updated correctly */
1987 for (i = 0; i < MAXQUOTAS; i++) {
1988 if (EXT4_SB(sb)->s_qf_names[i]) {
1989 int ret = ext4_quota_on_mount(sb, i);
1990 if (ret < 0)
1991 ext4_msg(sb, KERN_ERR,
1992 "Cannot turn on journaled "
1993 "quota: error %d", ret);
1994 }
1995 }
1996 #endif
1997
1998 while (es->s_last_orphan) {
1999 struct inode *inode;
2000
2001 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2002 if (IS_ERR(inode)) {
2003 es->s_last_orphan = 0;
2004 break;
2005 }
2006
2007 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2008 dquot_initialize(inode);
2009 if (inode->i_nlink) {
2010 ext4_msg(sb, KERN_DEBUG,
2011 "%s: truncating inode %lu to %lld bytes",
2012 __func__, inode->i_ino, inode->i_size);
2013 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2014 inode->i_ino, inode->i_size);
2015 ext4_truncate(inode);
2016 nr_truncates++;
2017 } else {
2018 ext4_msg(sb, KERN_DEBUG,
2019 "%s: deleting unreferenced inode %lu",
2020 __func__, inode->i_ino);
2021 jbd_debug(2, "deleting unreferenced inode %lu\n",
2022 inode->i_ino);
2023 nr_orphans++;
2024 }
2025 iput(inode); /* The delete magic happens here! */
2026 }
2027
2028 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2029
2030 if (nr_orphans)
2031 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2032 PLURAL(nr_orphans));
2033 if (nr_truncates)
2034 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2035 PLURAL(nr_truncates));
2036 #ifdef CONFIG_QUOTA
2037 /* Turn quotas off */
2038 for (i = 0; i < MAXQUOTAS; i++) {
2039 if (sb_dqopt(sb)->files[i])
2040 vfs_quota_off(sb, i, 0);
2041 }
2042 #endif
2043 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2044 }
2045
2046 /*
2047 * Maximal extent format file size.
2048 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2049 * extent format containers, within a sector_t, and within i_blocks
2050 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2051 * so that won't be a limiting factor.
2052 *
2053 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2054 */
2055 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2056 {
2057 loff_t res;
2058 loff_t upper_limit = MAX_LFS_FILESIZE;
2059
2060 /* small i_blocks in vfs inode? */
2061 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2062 /*
2063 * CONFIG_LBDAF is not enabled implies the inode
2064 * i_block represent total blocks in 512 bytes
2065 * 32 == size of vfs inode i_blocks * 8
2066 */
2067 upper_limit = (1LL << 32) - 1;
2068
2069 /* total blocks in file system block size */
2070 upper_limit >>= (blkbits - 9);
2071 upper_limit <<= blkbits;
2072 }
2073
2074 /* 32-bit extent-start container, ee_block */
2075 res = 1LL << 32;
2076 res <<= blkbits;
2077 res -= 1;
2078
2079 /* Sanity check against vm- & vfs- imposed limits */
2080 if (res > upper_limit)
2081 res = upper_limit;
2082
2083 return res;
2084 }
2085
2086 /*
2087 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2088 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2089 * We need to be 1 filesystem block less than the 2^48 sector limit.
2090 */
2091 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2092 {
2093 loff_t res = EXT4_NDIR_BLOCKS;
2094 int meta_blocks;
2095 loff_t upper_limit;
2096 /* This is calculated to be the largest file size for a dense, block
2097 * mapped file such that the file's total number of 512-byte sectors,
2098 * including data and all indirect blocks, does not exceed (2^48 - 1).
2099 *
2100 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2101 * number of 512-byte sectors of the file.
2102 */
2103
2104 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2105 /*
2106 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2107 * the inode i_block field represents total file blocks in
2108 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2109 */
2110 upper_limit = (1LL << 32) - 1;
2111
2112 /* total blocks in file system block size */
2113 upper_limit >>= (bits - 9);
2114
2115 } else {
2116 /*
2117 * We use 48 bit ext4_inode i_blocks
2118 * With EXT4_HUGE_FILE_FL set the i_blocks
2119 * represent total number of blocks in
2120 * file system block size
2121 */
2122 upper_limit = (1LL << 48) - 1;
2123
2124 }
2125
2126 /* indirect blocks */
2127 meta_blocks = 1;
2128 /* double indirect blocks */
2129 meta_blocks += 1 + (1LL << (bits-2));
2130 /* tripple indirect blocks */
2131 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2132
2133 upper_limit -= meta_blocks;
2134 upper_limit <<= bits;
2135
2136 res += 1LL << (bits-2);
2137 res += 1LL << (2*(bits-2));
2138 res += 1LL << (3*(bits-2));
2139 res <<= bits;
2140 if (res > upper_limit)
2141 res = upper_limit;
2142
2143 if (res > MAX_LFS_FILESIZE)
2144 res = MAX_LFS_FILESIZE;
2145
2146 return res;
2147 }
2148
2149 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2150 ext4_fsblk_t logical_sb_block, int nr)
2151 {
2152 struct ext4_sb_info *sbi = EXT4_SB(sb);
2153 ext4_group_t bg, first_meta_bg;
2154 int has_super = 0;
2155
2156 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2157
2158 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2159 nr < first_meta_bg)
2160 return logical_sb_block + nr + 1;
2161 bg = sbi->s_desc_per_block * nr;
2162 if (ext4_bg_has_super(sb, bg))
2163 has_super = 1;
2164
2165 return (has_super + ext4_group_first_block_no(sb, bg));
2166 }
2167
2168 /**
2169 * ext4_get_stripe_size: Get the stripe size.
2170 * @sbi: In memory super block info
2171 *
2172 * If we have specified it via mount option, then
2173 * use the mount option value. If the value specified at mount time is
2174 * greater than the blocks per group use the super block value.
2175 * If the super block value is greater than blocks per group return 0.
2176 * Allocator needs it be less than blocks per group.
2177 *
2178 */
2179 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2180 {
2181 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2182 unsigned long stripe_width =
2183 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2184
2185 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2186 return sbi->s_stripe;
2187
2188 if (stripe_width <= sbi->s_blocks_per_group)
2189 return stripe_width;
2190
2191 if (stride <= sbi->s_blocks_per_group)
2192 return stride;
2193
2194 return 0;
2195 }
2196
2197 /* sysfs supprt */
2198
2199 struct ext4_attr {
2200 struct attribute attr;
2201 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2202 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2203 const char *, size_t);
2204 int offset;
2205 };
2206
2207 static int parse_strtoul(const char *buf,
2208 unsigned long max, unsigned long *value)
2209 {
2210 char *endp;
2211
2212 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2213 endp = skip_spaces(endp);
2214 if (*endp || *value > max)
2215 return -EINVAL;
2216
2217 return 0;
2218 }
2219
2220 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2221 struct ext4_sb_info *sbi,
2222 char *buf)
2223 {
2224 return snprintf(buf, PAGE_SIZE, "%llu\n",
2225 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2226 }
2227
2228 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2229 struct ext4_sb_info *sbi, char *buf)
2230 {
2231 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2232
2233 return snprintf(buf, PAGE_SIZE, "%lu\n",
2234 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2235 sbi->s_sectors_written_start) >> 1);
2236 }
2237
2238 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2239 struct ext4_sb_info *sbi, char *buf)
2240 {
2241 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2242
2243 return snprintf(buf, PAGE_SIZE, "%llu\n",
2244 (unsigned long long)(sbi->s_kbytes_written +
2245 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2246 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2247 }
2248
2249 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2250 struct ext4_sb_info *sbi,
2251 const char *buf, size_t count)
2252 {
2253 unsigned long t;
2254
2255 if (parse_strtoul(buf, 0x40000000, &t))
2256 return -EINVAL;
2257
2258 if (!is_power_of_2(t))
2259 return -EINVAL;
2260
2261 sbi->s_inode_readahead_blks = t;
2262 return count;
2263 }
2264
2265 static ssize_t sbi_ui_show(struct ext4_attr *a,
2266 struct ext4_sb_info *sbi, char *buf)
2267 {
2268 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2269
2270 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2271 }
2272
2273 static ssize_t sbi_ui_store(struct ext4_attr *a,
2274 struct ext4_sb_info *sbi,
2275 const char *buf, size_t count)
2276 {
2277 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2278 unsigned long t;
2279
2280 if (parse_strtoul(buf, 0xffffffff, &t))
2281 return -EINVAL;
2282 *ui = t;
2283 return count;
2284 }
2285
2286 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2287 static struct ext4_attr ext4_attr_##_name = { \
2288 .attr = {.name = __stringify(_name), .mode = _mode }, \
2289 .show = _show, \
2290 .store = _store, \
2291 .offset = offsetof(struct ext4_sb_info, _elname), \
2292 }
2293 #define EXT4_ATTR(name, mode, show, store) \
2294 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2295
2296 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2297 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2298 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2299 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2300 #define ATTR_LIST(name) &ext4_attr_##name.attr
2301
2302 EXT4_RO_ATTR(delayed_allocation_blocks);
2303 EXT4_RO_ATTR(session_write_kbytes);
2304 EXT4_RO_ATTR(lifetime_write_kbytes);
2305 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2306 inode_readahead_blks_store, s_inode_readahead_blks);
2307 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2308 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2309 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2310 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2311 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2312 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2313 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2314 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2315
2316 static struct attribute *ext4_attrs[] = {
2317 ATTR_LIST(delayed_allocation_blocks),
2318 ATTR_LIST(session_write_kbytes),
2319 ATTR_LIST(lifetime_write_kbytes),
2320 ATTR_LIST(inode_readahead_blks),
2321 ATTR_LIST(inode_goal),
2322 ATTR_LIST(mb_stats),
2323 ATTR_LIST(mb_max_to_scan),
2324 ATTR_LIST(mb_min_to_scan),
2325 ATTR_LIST(mb_order2_req),
2326 ATTR_LIST(mb_stream_req),
2327 ATTR_LIST(mb_group_prealloc),
2328 ATTR_LIST(max_writeback_mb_bump),
2329 NULL,
2330 };
2331
2332 static ssize_t ext4_attr_show(struct kobject *kobj,
2333 struct attribute *attr, char *buf)
2334 {
2335 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2336 s_kobj);
2337 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2338
2339 return a->show ? a->show(a, sbi, buf) : 0;
2340 }
2341
2342 static ssize_t ext4_attr_store(struct kobject *kobj,
2343 struct attribute *attr,
2344 const char *buf, size_t len)
2345 {
2346 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2347 s_kobj);
2348 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2349
2350 return a->store ? a->store(a, sbi, buf, len) : 0;
2351 }
2352
2353 static void ext4_sb_release(struct kobject *kobj)
2354 {
2355 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2356 s_kobj);
2357 complete(&sbi->s_kobj_unregister);
2358 }
2359
2360
2361 static const struct sysfs_ops ext4_attr_ops = {
2362 .show = ext4_attr_show,
2363 .store = ext4_attr_store,
2364 };
2365
2366 static struct kobj_type ext4_ktype = {
2367 .default_attrs = ext4_attrs,
2368 .sysfs_ops = &ext4_attr_ops,
2369 .release = ext4_sb_release,
2370 };
2371
2372 /*
2373 * Check whether this filesystem can be mounted based on
2374 * the features present and the RDONLY/RDWR mount requested.
2375 * Returns 1 if this filesystem can be mounted as requested,
2376 * 0 if it cannot be.
2377 */
2378 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2379 {
2380 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2381 ext4_msg(sb, KERN_ERR,
2382 "Couldn't mount because of "
2383 "unsupported optional features (%x)",
2384 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2385 ~EXT4_FEATURE_INCOMPAT_SUPP));
2386 return 0;
2387 }
2388
2389 if (readonly)
2390 return 1;
2391
2392 /* Check that feature set is OK for a read-write mount */
2393 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2394 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2395 "unsupported optional features (%x)",
2396 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2397 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2398 return 0;
2399 }
2400 /*
2401 * Large file size enabled file system can only be mounted
2402 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2403 */
2404 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2405 if (sizeof(blkcnt_t) < sizeof(u64)) {
2406 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2407 "cannot be mounted RDWR without "
2408 "CONFIG_LBDAF");
2409 return 0;
2410 }
2411 }
2412 return 1;
2413 }
2414
2415 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2416 __releases(kernel_lock)
2417 __acquires(kernel_lock)
2418 {
2419 struct buffer_head *bh;
2420 struct ext4_super_block *es = NULL;
2421 struct ext4_sb_info *sbi;
2422 ext4_fsblk_t block;
2423 ext4_fsblk_t sb_block = get_sb_block(&data);
2424 ext4_fsblk_t logical_sb_block;
2425 unsigned long offset = 0;
2426 unsigned long journal_devnum = 0;
2427 unsigned long def_mount_opts;
2428 struct inode *root;
2429 char *cp;
2430 const char *descr;
2431 int ret = -EINVAL;
2432 int blocksize;
2433 unsigned int db_count;
2434 unsigned int i;
2435 int needs_recovery, has_huge_files;
2436 __u64 blocks_count;
2437 int err;
2438 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2439
2440 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2441 if (!sbi)
2442 return -ENOMEM;
2443
2444 sbi->s_blockgroup_lock =
2445 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2446 if (!sbi->s_blockgroup_lock) {
2447 kfree(sbi);
2448 return -ENOMEM;
2449 }
2450 sb->s_fs_info = sbi;
2451 sbi->s_mount_opt = 0;
2452 sbi->s_resuid = EXT4_DEF_RESUID;
2453 sbi->s_resgid = EXT4_DEF_RESGID;
2454 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2455 sbi->s_sb_block = sb_block;
2456 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2457 sectors[1]);
2458
2459 unlock_kernel();
2460
2461 /* Cleanup superblock name */
2462 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2463 *cp = '!';
2464
2465 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2466 if (!blocksize) {
2467 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
2468 goto out_fail;
2469 }
2470
2471 /*
2472 * The ext4 superblock will not be buffer aligned for other than 1kB
2473 * block sizes. We need to calculate the offset from buffer start.
2474 */
2475 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2476 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2477 offset = do_div(logical_sb_block, blocksize);
2478 } else {
2479 logical_sb_block = sb_block;
2480 }
2481
2482 if (!(bh = sb_bread(sb, logical_sb_block))) {
2483 ext4_msg(sb, KERN_ERR, "unable to read superblock");
2484 goto out_fail;
2485 }
2486 /*
2487 * Note: s_es must be initialized as soon as possible because
2488 * some ext4 macro-instructions depend on its value
2489 */
2490 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2491 sbi->s_es = es;
2492 sb->s_magic = le16_to_cpu(es->s_magic);
2493 if (sb->s_magic != EXT4_SUPER_MAGIC)
2494 goto cantfind_ext4;
2495 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2496
2497 /* Set defaults before we parse the mount options */
2498 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2499 if (def_mount_opts & EXT4_DEFM_DEBUG)
2500 set_opt(sbi->s_mount_opt, DEBUG);
2501 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
2502 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
2503 "2.6.38");
2504 set_opt(sbi->s_mount_opt, GRPID);
2505 }
2506 if (def_mount_opts & EXT4_DEFM_UID16)
2507 set_opt(sbi->s_mount_opt, NO_UID32);
2508 #ifdef CONFIG_EXT4_FS_XATTR
2509 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2510 set_opt(sbi->s_mount_opt, XATTR_USER);
2511 #endif
2512 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2513 if (def_mount_opts & EXT4_DEFM_ACL)
2514 set_opt(sbi->s_mount_opt, POSIX_ACL);
2515 #endif
2516 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2517 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2518 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2519 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2520 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2521 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2522
2523 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2524 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2525 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2526 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2527 else
2528 set_opt(sbi->s_mount_opt, ERRORS_RO);
2529
2530 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2531 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2532 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2533 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2534 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2535
2536 set_opt(sbi->s_mount_opt, BARRIER);
2537
2538 /*
2539 * enable delayed allocation by default
2540 * Use -o nodelalloc to turn it off
2541 */
2542 set_opt(sbi->s_mount_opt, DELALLOC);
2543
2544 if (!parse_options((char *) data, sb, &journal_devnum,
2545 &journal_ioprio, NULL, 0))
2546 goto failed_mount;
2547
2548 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2549 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2550
2551 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2552 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2553 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2554 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2555 ext4_msg(sb, KERN_WARNING,
2556 "feature flags set on rev 0 fs, "
2557 "running e2fsck is recommended");
2558
2559 /*
2560 * Check feature flags regardless of the revision level, since we
2561 * previously didn't change the revision level when setting the flags,
2562 * so there is a chance incompat flags are set on a rev 0 filesystem.
2563 */
2564 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
2565 goto failed_mount;
2566
2567 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2568
2569 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2570 blocksize > EXT4_MAX_BLOCK_SIZE) {
2571 ext4_msg(sb, KERN_ERR,
2572 "Unsupported filesystem blocksize %d", blocksize);
2573 goto failed_mount;
2574 }
2575
2576 if (sb->s_blocksize != blocksize) {
2577 /* Validate the filesystem blocksize */
2578 if (!sb_set_blocksize(sb, blocksize)) {
2579 ext4_msg(sb, KERN_ERR, "bad block size %d",
2580 blocksize);
2581 goto failed_mount;
2582 }
2583
2584 brelse(bh);
2585 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2586 offset = do_div(logical_sb_block, blocksize);
2587 bh = sb_bread(sb, logical_sb_block);
2588 if (!bh) {
2589 ext4_msg(sb, KERN_ERR,
2590 "Can't read superblock on 2nd try");
2591 goto failed_mount;
2592 }
2593 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2594 sbi->s_es = es;
2595 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2596 ext4_msg(sb, KERN_ERR,
2597 "Magic mismatch, very weird!");
2598 goto failed_mount;
2599 }
2600 }
2601
2602 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2603 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2604 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2605 has_huge_files);
2606 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2607
2608 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2609 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2610 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2611 } else {
2612 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2613 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2614 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2615 (!is_power_of_2(sbi->s_inode_size)) ||
2616 (sbi->s_inode_size > blocksize)) {
2617 ext4_msg(sb, KERN_ERR,
2618 "unsupported inode size: %d",
2619 sbi->s_inode_size);
2620 goto failed_mount;
2621 }
2622 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2623 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2624 }
2625
2626 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2627 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2628 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2629 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2630 !is_power_of_2(sbi->s_desc_size)) {
2631 ext4_msg(sb, KERN_ERR,
2632 "unsupported descriptor size %lu",
2633 sbi->s_desc_size);
2634 goto failed_mount;
2635 }
2636 } else
2637 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2638
2639 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2640 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2641 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2642 goto cantfind_ext4;
2643
2644 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2645 if (sbi->s_inodes_per_block == 0)
2646 goto cantfind_ext4;
2647 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2648 sbi->s_inodes_per_block;
2649 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2650 sbi->s_sbh = bh;
2651 sbi->s_mount_state = le16_to_cpu(es->s_state);
2652 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2653 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2654
2655 for (i = 0; i < 4; i++)
2656 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2657 sbi->s_def_hash_version = es->s_def_hash_version;
2658 i = le32_to_cpu(es->s_flags);
2659 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2660 sbi->s_hash_unsigned = 3;
2661 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2662 #ifdef __CHAR_UNSIGNED__
2663 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2664 sbi->s_hash_unsigned = 3;
2665 #else
2666 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2667 #endif
2668 sb->s_dirt = 1;
2669 }
2670
2671 if (sbi->s_blocks_per_group > blocksize * 8) {
2672 ext4_msg(sb, KERN_ERR,
2673 "#blocks per group too big: %lu",
2674 sbi->s_blocks_per_group);
2675 goto failed_mount;
2676 }
2677 if (sbi->s_inodes_per_group > blocksize * 8) {
2678 ext4_msg(sb, KERN_ERR,
2679 "#inodes per group too big: %lu",
2680 sbi->s_inodes_per_group);
2681 goto failed_mount;
2682 }
2683
2684 /*
2685 * Test whether we have more sectors than will fit in sector_t,
2686 * and whether the max offset is addressable by the page cache.
2687 */
2688 if ((ext4_blocks_count(es) >
2689 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2690 (ext4_blocks_count(es) >
2691 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
2692 ext4_msg(sb, KERN_ERR, "filesystem"
2693 " too large to mount safely on this system");
2694 if (sizeof(sector_t) < 8)
2695 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
2696 ret = -EFBIG;
2697 goto failed_mount;
2698 }
2699
2700 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2701 goto cantfind_ext4;
2702
2703 /* check blocks count against device size */
2704 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2705 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2706 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2707 "exceeds size of device (%llu blocks)",
2708 ext4_blocks_count(es), blocks_count);
2709 goto failed_mount;
2710 }
2711
2712 /*
2713 * It makes no sense for the first data block to be beyond the end
2714 * of the filesystem.
2715 */
2716 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2717 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2718 "block %u is beyond end of filesystem (%llu)",
2719 le32_to_cpu(es->s_first_data_block),
2720 ext4_blocks_count(es));
2721 goto failed_mount;
2722 }
2723 blocks_count = (ext4_blocks_count(es) -
2724 le32_to_cpu(es->s_first_data_block) +
2725 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2726 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2727 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2728 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
2729 "(block count %llu, first data block %u, "
2730 "blocks per group %lu)", sbi->s_groups_count,
2731 ext4_blocks_count(es),
2732 le32_to_cpu(es->s_first_data_block),
2733 EXT4_BLOCKS_PER_GROUP(sb));
2734 goto failed_mount;
2735 }
2736 sbi->s_groups_count = blocks_count;
2737 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2738 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
2739 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2740 EXT4_DESC_PER_BLOCK(sb);
2741 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2742 GFP_KERNEL);
2743 if (sbi->s_group_desc == NULL) {
2744 ext4_msg(sb, KERN_ERR, "not enough memory");
2745 goto failed_mount;
2746 }
2747
2748 #ifdef CONFIG_PROC_FS
2749 if (ext4_proc_root)
2750 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2751 #endif
2752
2753 bgl_lock_init(sbi->s_blockgroup_lock);
2754
2755 for (i = 0; i < db_count; i++) {
2756 block = descriptor_loc(sb, logical_sb_block, i);
2757 sbi->s_group_desc[i] = sb_bread(sb, block);
2758 if (!sbi->s_group_desc[i]) {
2759 ext4_msg(sb, KERN_ERR,
2760 "can't read group descriptor %d", i);
2761 db_count = i;
2762 goto failed_mount2;
2763 }
2764 }
2765 if (!ext4_check_descriptors(sb)) {
2766 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
2767 goto failed_mount2;
2768 }
2769 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2770 if (!ext4_fill_flex_info(sb)) {
2771 ext4_msg(sb, KERN_ERR,
2772 "unable to initialize "
2773 "flex_bg meta info!");
2774 goto failed_mount2;
2775 }
2776
2777 sbi->s_gdb_count = db_count;
2778 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2779 spin_lock_init(&sbi->s_next_gen_lock);
2780
2781 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2782 ext4_count_free_blocks(sb));
2783 if (!err) {
2784 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2785 ext4_count_free_inodes(sb));
2786 }
2787 if (!err) {
2788 err = percpu_counter_init(&sbi->s_dirs_counter,
2789 ext4_count_dirs(sb));
2790 }
2791 if (!err) {
2792 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2793 }
2794 if (err) {
2795 ext4_msg(sb, KERN_ERR, "insufficient memory");
2796 goto failed_mount3;
2797 }
2798
2799 sbi->s_stripe = ext4_get_stripe_size(sbi);
2800 sbi->s_max_writeback_mb_bump = 128;
2801
2802 /*
2803 * set up enough so that it can read an inode
2804 */
2805 if (!test_opt(sb, NOLOAD) &&
2806 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2807 sb->s_op = &ext4_sops;
2808 else
2809 sb->s_op = &ext4_nojournal_sops;
2810 sb->s_export_op = &ext4_export_ops;
2811 sb->s_xattr = ext4_xattr_handlers;
2812 #ifdef CONFIG_QUOTA
2813 sb->s_qcop = &ext4_qctl_operations;
2814 sb->dq_op = &ext4_quota_operations;
2815 #endif
2816 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2817 mutex_init(&sbi->s_orphan_lock);
2818 mutex_init(&sbi->s_resize_lock);
2819
2820 sb->s_root = NULL;
2821
2822 needs_recovery = (es->s_last_orphan != 0 ||
2823 EXT4_HAS_INCOMPAT_FEATURE(sb,
2824 EXT4_FEATURE_INCOMPAT_RECOVER));
2825
2826 /*
2827 * The first inode we look at is the journal inode. Don't try
2828 * root first: it may be modified in the journal!
2829 */
2830 if (!test_opt(sb, NOLOAD) &&
2831 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2832 if (ext4_load_journal(sb, es, journal_devnum))
2833 goto failed_mount3;
2834 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2835 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2836 ext4_msg(sb, KERN_ERR, "required journal recovery "
2837 "suppressed and not mounted read-only");
2838 goto failed_mount_wq;
2839 } else {
2840 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2841 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2842 sbi->s_journal = NULL;
2843 needs_recovery = 0;
2844 goto no_journal;
2845 }
2846
2847 if (ext4_blocks_count(es) > 0xffffffffULL &&
2848 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2849 JBD2_FEATURE_INCOMPAT_64BIT)) {
2850 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
2851 goto failed_mount_wq;
2852 }
2853
2854 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2855 jbd2_journal_set_features(sbi->s_journal,
2856 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2857 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2858 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2859 jbd2_journal_set_features(sbi->s_journal,
2860 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2861 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2862 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2863 } else {
2864 jbd2_journal_clear_features(sbi->s_journal,
2865 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2866 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2867 }
2868
2869 /* We have now updated the journal if required, so we can
2870 * validate the data journaling mode. */
2871 switch (test_opt(sb, DATA_FLAGS)) {
2872 case 0:
2873 /* No mode set, assume a default based on the journal
2874 * capabilities: ORDERED_DATA if the journal can
2875 * cope, else JOURNAL_DATA
2876 */
2877 if (jbd2_journal_check_available_features
2878 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2879 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2880 else
2881 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2882 break;
2883
2884 case EXT4_MOUNT_ORDERED_DATA:
2885 case EXT4_MOUNT_WRITEBACK_DATA:
2886 if (!jbd2_journal_check_available_features
2887 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2888 ext4_msg(sb, KERN_ERR, "Journal does not support "
2889 "requested data journaling mode");
2890 goto failed_mount_wq;
2891 }
2892 default:
2893 break;
2894 }
2895 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2896
2897 no_journal:
2898 if (test_opt(sb, NOBH)) {
2899 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2900 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2901 "its supported only with writeback mode");
2902 clear_opt(sbi->s_mount_opt, NOBH);
2903 }
2904 if (test_opt(sb, DIOREAD_NOLOCK)) {
2905 ext4_msg(sb, KERN_WARNING, "dioread_nolock option is "
2906 "not supported with nobh mode");
2907 goto failed_mount_wq;
2908 }
2909 }
2910 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2911 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2912 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2913 goto failed_mount_wq;
2914 }
2915
2916 /*
2917 * The jbd2_journal_load will have done any necessary log recovery,
2918 * so we can safely mount the rest of the filesystem now.
2919 */
2920
2921 root = ext4_iget(sb, EXT4_ROOT_INO);
2922 if (IS_ERR(root)) {
2923 ext4_msg(sb, KERN_ERR, "get root inode failed");
2924 ret = PTR_ERR(root);
2925 goto failed_mount4;
2926 }
2927 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2928 iput(root);
2929 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
2930 goto failed_mount4;
2931 }
2932 sb->s_root = d_alloc_root(root);
2933 if (!sb->s_root) {
2934 ext4_msg(sb, KERN_ERR, "get root dentry failed");
2935 iput(root);
2936 ret = -ENOMEM;
2937 goto failed_mount4;
2938 }
2939
2940 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2941
2942 /* determine the minimum size of new large inodes, if present */
2943 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2944 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2945 EXT4_GOOD_OLD_INODE_SIZE;
2946 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2947 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2948 if (sbi->s_want_extra_isize <
2949 le16_to_cpu(es->s_want_extra_isize))
2950 sbi->s_want_extra_isize =
2951 le16_to_cpu(es->s_want_extra_isize);
2952 if (sbi->s_want_extra_isize <
2953 le16_to_cpu(es->s_min_extra_isize))
2954 sbi->s_want_extra_isize =
2955 le16_to_cpu(es->s_min_extra_isize);
2956 }
2957 }
2958 /* Check if enough inode space is available */
2959 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2960 sbi->s_inode_size) {
2961 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2962 EXT4_GOOD_OLD_INODE_SIZE;
2963 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2964 "available");
2965 }
2966
2967 if (test_opt(sb, DELALLOC) &&
2968 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2969 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2970 "requested data journaling mode");
2971 clear_opt(sbi->s_mount_opt, DELALLOC);
2972 }
2973 if (test_opt(sb, DIOREAD_NOLOCK)) {
2974 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2975 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
2976 "option - requested data journaling mode");
2977 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
2978 }
2979 if (sb->s_blocksize < PAGE_SIZE) {
2980 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
2981 "option - block size is too small");
2982 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
2983 }
2984 }
2985
2986 err = ext4_setup_system_zone(sb);
2987 if (err) {
2988 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2989 "zone (%d)\n", err);
2990 goto failed_mount4;
2991 }
2992
2993 ext4_ext_init(sb);
2994 err = ext4_mb_init(sb, needs_recovery);
2995 if (err) {
2996 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2997 err);
2998 goto failed_mount4;
2999 }
3000
3001 sbi->s_kobj.kset = ext4_kset;
3002 init_completion(&sbi->s_kobj_unregister);
3003 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3004 "%s", sb->s_id);
3005 if (err) {
3006 ext4_mb_release(sb);
3007 ext4_ext_release(sb);
3008 goto failed_mount4;
3009 };
3010
3011 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3012 ext4_orphan_cleanup(sb, es);
3013 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3014 if (needs_recovery) {
3015 ext4_msg(sb, KERN_INFO, "recovery complete");
3016 ext4_mark_recovery_complete(sb, es);
3017 }
3018 if (EXT4_SB(sb)->s_journal) {
3019 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3020 descr = " journalled data mode";
3021 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3022 descr = " ordered data mode";
3023 else
3024 descr = " writeback data mode";
3025 } else
3026 descr = "out journal";
3027
3028 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
3029
3030 lock_kernel();
3031 return 0;
3032
3033 cantfind_ext4:
3034 if (!silent)
3035 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3036 goto failed_mount;
3037
3038 failed_mount4:
3039 ext4_msg(sb, KERN_ERR, "mount failed");
3040 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3041 failed_mount_wq:
3042 ext4_release_system_zone(sb);
3043 if (sbi->s_journal) {
3044 jbd2_journal_destroy(sbi->s_journal);
3045 sbi->s_journal = NULL;
3046 }
3047 failed_mount3:
3048 if (sbi->s_flex_groups) {
3049 if (is_vmalloc_addr(sbi->s_flex_groups))
3050 vfree(sbi->s_flex_groups);
3051 else
3052 kfree(sbi->s_flex_groups);
3053 }
3054 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3055 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3056 percpu_counter_destroy(&sbi->s_dirs_counter);
3057 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3058 failed_mount2:
3059 for (i = 0; i < db_count; i++)
3060 brelse(sbi->s_group_desc[i]);
3061 kfree(sbi->s_group_desc);
3062 failed_mount:
3063 if (sbi->s_proc) {
3064 remove_proc_entry(sb->s_id, ext4_proc_root);
3065 }
3066 #ifdef CONFIG_QUOTA
3067 for (i = 0; i < MAXQUOTAS; i++)
3068 kfree(sbi->s_qf_names[i]);
3069 #endif
3070 ext4_blkdev_remove(sbi);
3071 brelse(bh);
3072 out_fail:
3073 sb->s_fs_info = NULL;
3074 kfree(sbi->s_blockgroup_lock);
3075 kfree(sbi);
3076 lock_kernel();
3077 return ret;
3078 }
3079
3080 /*
3081 * Setup any per-fs journal parameters now. We'll do this both on
3082 * initial mount, once the journal has been initialised but before we've
3083 * done any recovery; and again on any subsequent remount.
3084 */
3085 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3086 {
3087 struct ext4_sb_info *sbi = EXT4_SB(sb);
3088
3089 journal->j_commit_interval = sbi->s_commit_interval;
3090 journal->j_min_batch_time = sbi->s_min_batch_time;
3091 journal->j_max_batch_time = sbi->s_max_batch_time;
3092
3093 spin_lock(&journal->j_state_lock);
3094 if (test_opt(sb, BARRIER))
3095 journal->j_flags |= JBD2_BARRIER;
3096 else
3097 journal->j_flags &= ~JBD2_BARRIER;
3098 if (test_opt(sb, DATA_ERR_ABORT))
3099 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3100 else
3101 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3102 spin_unlock(&journal->j_state_lock);
3103 }
3104
3105 static journal_t *ext4_get_journal(struct super_block *sb,
3106 unsigned int journal_inum)
3107 {
3108 struct inode *journal_inode;
3109 journal_t *journal;
3110
3111 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3112
3113 /* First, test for the existence of a valid inode on disk. Bad
3114 * things happen if we iget() an unused inode, as the subsequent
3115 * iput() will try to delete it. */
3116
3117 journal_inode = ext4_iget(sb, journal_inum);
3118 if (IS_ERR(journal_inode)) {
3119 ext4_msg(sb, KERN_ERR, "no journal found");
3120 return NULL;
3121 }
3122 if (!journal_inode->i_nlink) {
3123 make_bad_inode(journal_inode);
3124 iput(journal_inode);
3125 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3126 return NULL;
3127 }
3128
3129 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3130 journal_inode, journal_inode->i_size);
3131 if (!S_ISREG(journal_inode->i_mode)) {
3132 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3133 iput(journal_inode);
3134 return NULL;
3135 }
3136
3137 journal = jbd2_journal_init_inode(journal_inode);
3138 if (!journal) {
3139 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3140 iput(journal_inode);
3141 return NULL;
3142 }
3143 journal->j_private = sb;
3144 ext4_init_journal_params(sb, journal);
3145 return journal;
3146 }
3147
3148 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3149 dev_t j_dev)
3150 {
3151 struct buffer_head *bh;
3152 journal_t *journal;
3153 ext4_fsblk_t start;
3154 ext4_fsblk_t len;
3155 int hblock, blocksize;
3156 ext4_fsblk_t sb_block;
3157 unsigned long offset;
3158 struct ext4_super_block *es;
3159 struct block_device *bdev;
3160
3161 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3162
3163 bdev = ext4_blkdev_get(j_dev, sb);
3164 if (bdev == NULL)
3165 return NULL;
3166
3167 if (bd_claim(bdev, sb)) {
3168 ext4_msg(sb, KERN_ERR,
3169 "failed to claim external journal device");
3170 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3171 return NULL;
3172 }
3173
3174 blocksize = sb->s_blocksize;
3175 hblock = bdev_logical_block_size(bdev);
3176 if (blocksize < hblock) {
3177 ext4_msg(sb, KERN_ERR,
3178 "blocksize too small for journal device");
3179 goto out_bdev;
3180 }
3181
3182 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3183 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3184 set_blocksize(bdev, blocksize);
3185 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3186 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3187 "external journal");
3188 goto out_bdev;
3189 }
3190
3191 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3192 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3193 !(le32_to_cpu(es->s_feature_incompat) &
3194 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3195 ext4_msg(sb, KERN_ERR, "external journal has "
3196 "bad superblock");
3197 brelse(bh);
3198 goto out_bdev;
3199 }
3200
3201 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3202 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3203 brelse(bh);
3204 goto out_bdev;
3205 }
3206
3207 len = ext4_blocks_count(es);
3208 start = sb_block + 1;
3209 brelse(bh); /* we're done with the superblock */
3210
3211 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3212 start, len, blocksize);
3213 if (!journal) {
3214 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3215 goto out_bdev;
3216 }
3217 journal->j_private = sb;
3218 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3219 wait_on_buffer(journal->j_sb_buffer);
3220 if (!buffer_uptodate(journal->j_sb_buffer)) {
3221 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3222 goto out_journal;
3223 }
3224 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3225 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3226 "user (unsupported) - %d",
3227 be32_to_cpu(journal->j_superblock->s_nr_users));
3228 goto out_journal;
3229 }
3230 EXT4_SB(sb)->journal_bdev = bdev;
3231 ext4_init_journal_params(sb, journal);
3232 return journal;
3233
3234 out_journal:
3235 jbd2_journal_destroy(journal);
3236 out_bdev:
3237 ext4_blkdev_put(bdev);
3238 return NULL;
3239 }
3240
3241 static int ext4_load_journal(struct super_block *sb,
3242 struct ext4_super_block *es,
3243 unsigned long journal_devnum)
3244 {
3245 journal_t *journal;
3246 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3247 dev_t journal_dev;
3248 int err = 0;
3249 int really_read_only;
3250
3251 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3252
3253 if (journal_devnum &&
3254 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3255 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3256 "numbers have changed");
3257 journal_dev = new_decode_dev(journal_devnum);
3258 } else
3259 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3260
3261 really_read_only = bdev_read_only(sb->s_bdev);
3262
3263 /*
3264 * Are we loading a blank journal or performing recovery after a
3265 * crash? For recovery, we need to check in advance whether we
3266 * can get read-write access to the device.
3267 */
3268 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3269 if (sb->s_flags & MS_RDONLY) {
3270 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3271 "required on readonly filesystem");
3272 if (really_read_only) {
3273 ext4_msg(sb, KERN_ERR, "write access "
3274 "unavailable, cannot proceed");
3275 return -EROFS;
3276 }
3277 ext4_msg(sb, KERN_INFO, "write access will "
3278 "be enabled during recovery");
3279 }
3280 }
3281
3282 if (journal_inum && journal_dev) {
3283 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3284 "and inode journals!");
3285 return -EINVAL;
3286 }
3287
3288 if (journal_inum) {
3289 if (!(journal = ext4_get_journal(sb, journal_inum)))
3290 return -EINVAL;
3291 } else {
3292 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3293 return -EINVAL;
3294 }
3295
3296 if (!(journal->j_flags & JBD2_BARRIER))
3297 ext4_msg(sb, KERN_INFO, "barriers disabled");
3298
3299 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3300 err = jbd2_journal_update_format(journal);
3301 if (err) {
3302 ext4_msg(sb, KERN_ERR, "error updating journal");
3303 jbd2_journal_destroy(journal);
3304 return err;
3305 }
3306 }
3307
3308 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3309 err = jbd2_journal_wipe(journal, !really_read_only);
3310 if (!err)
3311 err = jbd2_journal_load(journal);
3312
3313 if (err) {
3314 ext4_msg(sb, KERN_ERR, "error loading journal");
3315 jbd2_journal_destroy(journal);
3316 return err;
3317 }
3318
3319 EXT4_SB(sb)->s_journal = journal;
3320 ext4_clear_journal_err(sb, es);
3321
3322 if (journal_devnum &&
3323 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3324 es->s_journal_dev = cpu_to_le32(journal_devnum);
3325
3326 /* Make sure we flush the recovery flag to disk. */
3327 ext4_commit_super(sb, 1);
3328 }
3329
3330 return 0;
3331 }
3332
3333 static int ext4_commit_super(struct super_block *sb, int sync)
3334 {
3335 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3336 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3337 int error = 0;
3338
3339 if (!sbh)
3340 return error;
3341 if (buffer_write_io_error(sbh)) {
3342 /*
3343 * Oh, dear. A previous attempt to write the
3344 * superblock failed. This could happen because the
3345 * USB device was yanked out. Or it could happen to
3346 * be a transient write error and maybe the block will
3347 * be remapped. Nothing we can do but to retry the
3348 * write and hope for the best.
3349 */
3350 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3351 "superblock detected");
3352 clear_buffer_write_io_error(sbh);
3353 set_buffer_uptodate(sbh);
3354 }
3355 /*
3356 * If the file system is mounted read-only, don't update the
3357 * superblock write time. This avoids updating the superblock
3358 * write time when we are mounting the root file system
3359 * read/only but we need to replay the journal; at that point,
3360 * for people who are east of GMT and who make their clock
3361 * tick in localtime for Windows bug-for-bug compatibility,
3362 * the clock is set in the future, and this will cause e2fsck
3363 * to complain and force a full file system check.
3364 */
3365 if (!(sb->s_flags & MS_RDONLY))
3366 es->s_wtime = cpu_to_le32(get_seconds());
3367 es->s_kbytes_written =
3368 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3369 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3370 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3371 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3372 &EXT4_SB(sb)->s_freeblocks_counter));
3373 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3374 &EXT4_SB(sb)->s_freeinodes_counter));
3375 sb->s_dirt = 0;
3376 BUFFER_TRACE(sbh, "marking dirty");
3377 mark_buffer_dirty(sbh);
3378 if (sync) {
3379 error = sync_dirty_buffer(sbh);
3380 if (error)
3381 return error;
3382
3383 error = buffer_write_io_error(sbh);
3384 if (error) {
3385 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3386 "superblock");
3387 clear_buffer_write_io_error(sbh);
3388 set_buffer_uptodate(sbh);
3389 }
3390 }
3391 return error;
3392 }
3393
3394 /*
3395 * Have we just finished recovery? If so, and if we are mounting (or
3396 * remounting) the filesystem readonly, then we will end up with a
3397 * consistent fs on disk. Record that fact.
3398 */
3399 static void ext4_mark_recovery_complete(struct super_block *sb,
3400 struct ext4_super_block *es)
3401 {
3402 journal_t *journal = EXT4_SB(sb)->s_journal;
3403
3404 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3405 BUG_ON(journal != NULL);
3406 return;
3407 }
3408 jbd2_journal_lock_updates(journal);
3409 if (jbd2_journal_flush(journal) < 0)
3410 goto out;
3411
3412 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
3413 sb->s_flags & MS_RDONLY) {
3414 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3415 ext4_commit_super(sb, 1);
3416 }
3417
3418 out:
3419 jbd2_journal_unlock_updates(journal);
3420 }
3421
3422 /*
3423 * If we are mounting (or read-write remounting) a filesystem whose journal
3424 * has recorded an error from a previous lifetime, move that error to the
3425 * main filesystem now.
3426 */
3427 static void ext4_clear_journal_err(struct super_block *sb,
3428 struct ext4_super_block *es)
3429 {
3430 journal_t *journal;
3431 int j_errno;
3432 const char *errstr;
3433
3434 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3435
3436 journal = EXT4_SB(sb)->s_journal;
3437
3438 /*
3439 * Now check for any error status which may have been recorded in the
3440 * journal by a prior ext4_error() or ext4_abort()
3441 */
3442
3443 j_errno = jbd2_journal_errno(journal);
3444 if (j_errno) {
3445 char nbuf[16];
3446
3447 errstr = ext4_decode_error(sb, j_errno, nbuf);
3448 ext4_warning(sb, "Filesystem error recorded "
3449 "from previous mount: %s", errstr);
3450 ext4_warning(sb, "Marking fs in need of filesystem check.");
3451
3452 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3453 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3454 ext4_commit_super(sb, 1);
3455
3456 jbd2_journal_clear_err(journal);
3457 }
3458 }
3459
3460 /*
3461 * Force the running and committing transactions to commit,
3462 * and wait on the commit.
3463 */
3464 int ext4_force_commit(struct super_block *sb)
3465 {
3466 journal_t *journal;
3467 int ret = 0;
3468
3469 if (sb->s_flags & MS_RDONLY)
3470 return 0;
3471
3472 journal = EXT4_SB(sb)->s_journal;
3473 if (journal)
3474 ret = ext4_journal_force_commit(journal);
3475
3476 return ret;
3477 }
3478
3479 static void ext4_write_super(struct super_block *sb)
3480 {
3481 lock_super(sb);
3482 ext4_commit_super(sb, 1);
3483 unlock_super(sb);
3484 }
3485
3486 static int ext4_sync_fs(struct super_block *sb, int wait)
3487 {
3488 int ret = 0;
3489 tid_t target;
3490 struct ext4_sb_info *sbi = EXT4_SB(sb);
3491
3492 trace_ext4_sync_fs(sb, wait);
3493 flush_workqueue(sbi->dio_unwritten_wq);
3494 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
3495 if (wait)
3496 jbd2_log_wait_commit(sbi->s_journal, target);
3497 }
3498 return ret;
3499 }
3500
3501 /*
3502 * LVM calls this function before a (read-only) snapshot is created. This
3503 * gives us a chance to flush the journal completely and mark the fs clean.
3504 */
3505 static int ext4_freeze(struct super_block *sb)
3506 {
3507 int error = 0;
3508 journal_t *journal;
3509
3510 if (sb->s_flags & MS_RDONLY)
3511 return 0;
3512
3513 journal = EXT4_SB(sb)->s_journal;
3514
3515 /* Now we set up the journal barrier. */
3516 jbd2_journal_lock_updates(journal);
3517
3518 /*
3519 * Don't clear the needs_recovery flag if we failed to flush
3520 * the journal.
3521 */
3522 error = jbd2_journal_flush(journal);
3523 if (error < 0) {
3524 out:
3525 jbd2_journal_unlock_updates(journal);
3526 return error;
3527 }
3528
3529 /* Journal blocked and flushed, clear needs_recovery flag. */
3530 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3531 error = ext4_commit_super(sb, 1);
3532 if (error)
3533 goto out;
3534 return 0;
3535 }
3536
3537 /*
3538 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3539 * flag here, even though the filesystem is not technically dirty yet.
3540 */
3541 static int ext4_unfreeze(struct super_block *sb)
3542 {
3543 if (sb->s_flags & MS_RDONLY)
3544 return 0;
3545
3546 lock_super(sb);
3547 /* Reset the needs_recovery flag before the fs is unlocked. */
3548 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3549 ext4_commit_super(sb, 1);
3550 unlock_super(sb);
3551 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3552 return 0;
3553 }
3554
3555 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3556 {
3557 struct ext4_super_block *es;
3558 struct ext4_sb_info *sbi = EXT4_SB(sb);
3559 ext4_fsblk_t n_blocks_count = 0;
3560 unsigned long old_sb_flags;
3561 struct ext4_mount_options old_opts;
3562 ext4_group_t g;
3563 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3564 int err;
3565 #ifdef CONFIG_QUOTA
3566 int i;
3567 #endif
3568
3569 lock_kernel();
3570
3571 /* Store the original options */
3572 lock_super(sb);
3573 old_sb_flags = sb->s_flags;
3574 old_opts.s_mount_opt = sbi->s_mount_opt;
3575 old_opts.s_resuid = sbi->s_resuid;
3576 old_opts.s_resgid = sbi->s_resgid;
3577 old_opts.s_commit_interval = sbi->s_commit_interval;
3578 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3579 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3580 #ifdef CONFIG_QUOTA
3581 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3582 for (i = 0; i < MAXQUOTAS; i++)
3583 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3584 #endif
3585 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3586 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3587
3588 /*
3589 * Allow the "check" option to be passed as a remount option.
3590 */
3591 if (!parse_options(data, sb, NULL, &journal_ioprio,
3592 &n_blocks_count, 1)) {
3593 err = -EINVAL;
3594 goto restore_opts;
3595 }
3596
3597 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
3598 ext4_abort(sb, __func__, "Abort forced by user");
3599
3600 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3601 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3602
3603 es = sbi->s_es;
3604
3605 if (sbi->s_journal) {
3606 ext4_init_journal_params(sb, sbi->s_journal);
3607 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3608 }
3609
3610 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3611 n_blocks_count > ext4_blocks_count(es)) {
3612 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
3613 err = -EROFS;
3614 goto restore_opts;
3615 }
3616
3617 if (*flags & MS_RDONLY) {
3618 /*
3619 * First of all, the unconditional stuff we have to do
3620 * to disable replay of the journal when we next remount
3621 */
3622 sb->s_flags |= MS_RDONLY;
3623
3624 /*
3625 * OK, test if we are remounting a valid rw partition
3626 * readonly, and if so set the rdonly flag and then
3627 * mark the partition as valid again.
3628 */
3629 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3630 (sbi->s_mount_state & EXT4_VALID_FS))
3631 es->s_state = cpu_to_le16(sbi->s_mount_state);
3632
3633 if (sbi->s_journal)
3634 ext4_mark_recovery_complete(sb, es);
3635 } else {
3636 /* Make sure we can mount this feature set readwrite */
3637 if (!ext4_feature_set_ok(sb, 0)) {
3638 err = -EROFS;
3639 goto restore_opts;
3640 }
3641 /*
3642 * Make sure the group descriptor checksums
3643 * are sane. If they aren't, refuse to remount r/w.
3644 */
3645 for (g = 0; g < sbi->s_groups_count; g++) {
3646 struct ext4_group_desc *gdp =
3647 ext4_get_group_desc(sb, g, NULL);
3648
3649 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3650 ext4_msg(sb, KERN_ERR,
3651 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3652 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3653 le16_to_cpu(gdp->bg_checksum));
3654 err = -EINVAL;
3655 goto restore_opts;
3656 }
3657 }
3658
3659 /*
3660 * If we have an unprocessed orphan list hanging
3661 * around from a previously readonly bdev mount,
3662 * require a full umount/remount for now.
3663 */
3664 if (es->s_last_orphan) {
3665 ext4_msg(sb, KERN_WARNING, "Couldn't "
3666 "remount RDWR because of unprocessed "
3667 "orphan inode list. Please "
3668 "umount/remount instead");
3669 err = -EINVAL;
3670 goto restore_opts;
3671 }
3672
3673 /*
3674 * Mounting a RDONLY partition read-write, so reread
3675 * and store the current valid flag. (It may have
3676 * been changed by e2fsck since we originally mounted
3677 * the partition.)
3678 */
3679 if (sbi->s_journal)
3680 ext4_clear_journal_err(sb, es);
3681 sbi->s_mount_state = le16_to_cpu(es->s_state);
3682 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3683 goto restore_opts;
3684 if (!ext4_setup_super(sb, es, 0))
3685 sb->s_flags &= ~MS_RDONLY;
3686 }
3687 }
3688 ext4_setup_system_zone(sb);
3689 if (sbi->s_journal == NULL)
3690 ext4_commit_super(sb, 1);
3691
3692 #ifdef CONFIG_QUOTA
3693 /* Release old quota file names */
3694 for (i = 0; i < MAXQUOTAS; i++)
3695 if (old_opts.s_qf_names[i] &&
3696 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3697 kfree(old_opts.s_qf_names[i]);
3698 #endif
3699 unlock_super(sb);
3700 unlock_kernel();
3701 return 0;
3702
3703 restore_opts:
3704 sb->s_flags = old_sb_flags;
3705 sbi->s_mount_opt = old_opts.s_mount_opt;
3706 sbi->s_resuid = old_opts.s_resuid;
3707 sbi->s_resgid = old_opts.s_resgid;
3708 sbi->s_commit_interval = old_opts.s_commit_interval;
3709 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3710 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3711 #ifdef CONFIG_QUOTA
3712 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3713 for (i = 0; i < MAXQUOTAS; i++) {
3714 if (sbi->s_qf_names[i] &&
3715 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3716 kfree(sbi->s_qf_names[i]);
3717 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3718 }
3719 #endif
3720 unlock_super(sb);
3721 unlock_kernel();
3722 return err;
3723 }
3724
3725 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3726 {
3727 struct super_block *sb = dentry->d_sb;
3728 struct ext4_sb_info *sbi = EXT4_SB(sb);
3729 struct ext4_super_block *es = sbi->s_es;
3730 u64 fsid;
3731
3732 if (test_opt(sb, MINIX_DF)) {
3733 sbi->s_overhead_last = 0;
3734 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3735 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3736 ext4_fsblk_t overhead = 0;
3737
3738 /*
3739 * Compute the overhead (FS structures). This is constant
3740 * for a given filesystem unless the number of block groups
3741 * changes so we cache the previous value until it does.
3742 */
3743
3744 /*
3745 * All of the blocks before first_data_block are
3746 * overhead
3747 */
3748 overhead = le32_to_cpu(es->s_first_data_block);
3749
3750 /*
3751 * Add the overhead attributed to the superblock and
3752 * block group descriptors. If the sparse superblocks
3753 * feature is turned on, then not all groups have this.
3754 */
3755 for (i = 0; i < ngroups; i++) {
3756 overhead += ext4_bg_has_super(sb, i) +
3757 ext4_bg_num_gdb(sb, i);
3758 cond_resched();
3759 }
3760
3761 /*
3762 * Every block group has an inode bitmap, a block
3763 * bitmap, and an inode table.
3764 */
3765 overhead += ngroups * (2 + sbi->s_itb_per_group);
3766 sbi->s_overhead_last = overhead;
3767 smp_wmb();
3768 sbi->s_blocks_last = ext4_blocks_count(es);
3769 }
3770
3771 buf->f_type = EXT4_SUPER_MAGIC;
3772 buf->f_bsize = sb->s_blocksize;
3773 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3774 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3775 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3776 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3777 if (buf->f_bfree < ext4_r_blocks_count(es))
3778 buf->f_bavail = 0;
3779 buf->f_files = le32_to_cpu(es->s_inodes_count);
3780 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3781 buf->f_namelen = EXT4_NAME_LEN;
3782 fsid = le64_to_cpup((void *)es->s_uuid) ^
3783 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3784 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3785 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3786
3787 return 0;
3788 }
3789
3790 /* Helper function for writing quotas on sync - we need to start transaction
3791 * before quota file is locked for write. Otherwise the are possible deadlocks:
3792 * Process 1 Process 2
3793 * ext4_create() quota_sync()
3794 * jbd2_journal_start() write_dquot()
3795 * dquot_initialize() down(dqio_mutex)
3796 * down(dqio_mutex) jbd2_journal_start()
3797 *
3798 */
3799
3800 #ifdef CONFIG_QUOTA
3801
3802 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3803 {
3804 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3805 }
3806
3807 static int ext4_write_dquot(struct dquot *dquot)
3808 {
3809 int ret, err;
3810 handle_t *handle;
3811 struct inode *inode;
3812
3813 inode = dquot_to_inode(dquot);
3814 handle = ext4_journal_start(inode,
3815 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3816 if (IS_ERR(handle))
3817 return PTR_ERR(handle);
3818 ret = dquot_commit(dquot);
3819 err = ext4_journal_stop(handle);
3820 if (!ret)
3821 ret = err;
3822 return ret;
3823 }
3824
3825 static int ext4_acquire_dquot(struct dquot *dquot)
3826 {
3827 int ret, err;
3828 handle_t *handle;
3829
3830 handle = ext4_journal_start(dquot_to_inode(dquot),
3831 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3832 if (IS_ERR(handle))
3833 return PTR_ERR(handle);
3834 ret = dquot_acquire(dquot);
3835 err = ext4_journal_stop(handle);
3836 if (!ret)
3837 ret = err;
3838 return ret;
3839 }
3840
3841 static int ext4_release_dquot(struct dquot *dquot)
3842 {
3843 int ret, err;
3844 handle_t *handle;
3845
3846 handle = ext4_journal_start(dquot_to_inode(dquot),
3847 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3848 if (IS_ERR(handle)) {
3849 /* Release dquot anyway to avoid endless cycle in dqput() */
3850 dquot_release(dquot);
3851 return PTR_ERR(handle);
3852 }
3853 ret = dquot_release(dquot);
3854 err = ext4_journal_stop(handle);
3855 if (!ret)
3856 ret = err;
3857 return ret;
3858 }
3859
3860 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3861 {
3862 /* Are we journaling quotas? */
3863 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3864 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3865 dquot_mark_dquot_dirty(dquot);
3866 return ext4_write_dquot(dquot);
3867 } else {
3868 return dquot_mark_dquot_dirty(dquot);
3869 }
3870 }
3871
3872 static int ext4_write_info(struct super_block *sb, int type)
3873 {
3874 int ret, err;
3875 handle_t *handle;
3876
3877 /* Data block + inode block */
3878 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3879 if (IS_ERR(handle))
3880 return PTR_ERR(handle);
3881 ret = dquot_commit_info(sb, type);
3882 err = ext4_journal_stop(handle);
3883 if (!ret)
3884 ret = err;
3885 return ret;
3886 }
3887
3888 /*
3889 * Turn on quotas during mount time - we need to find
3890 * the quota file and such...
3891 */
3892 static int ext4_quota_on_mount(struct super_block *sb, int type)
3893 {
3894 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3895 EXT4_SB(sb)->s_jquota_fmt, type);
3896 }
3897
3898 /*
3899 * Standard function to be called on quota_on
3900 */
3901 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3902 char *name, int remount)
3903 {
3904 int err;
3905 struct path path;
3906
3907 if (!test_opt(sb, QUOTA))
3908 return -EINVAL;
3909 /* When remounting, no checks are needed and in fact, name is NULL */
3910 if (remount)
3911 return vfs_quota_on(sb, type, format_id, name, remount);
3912
3913 err = kern_path(name, LOOKUP_FOLLOW, &path);
3914 if (err)
3915 return err;
3916
3917 /* Quotafile not on the same filesystem? */
3918 if (path.mnt->mnt_sb != sb) {
3919 path_put(&path);
3920 return -EXDEV;
3921 }
3922 /* Journaling quota? */
3923 if (EXT4_SB(sb)->s_qf_names[type]) {
3924 /* Quotafile not in fs root? */
3925 if (path.dentry->d_parent != sb->s_root)
3926 ext4_msg(sb, KERN_WARNING,
3927 "Quota file not on filesystem root. "
3928 "Journaled quota will not work");
3929 }
3930
3931 /*
3932 * When we journal data on quota file, we have to flush journal to see
3933 * all updates to the file when we bypass pagecache...
3934 */
3935 if (EXT4_SB(sb)->s_journal &&
3936 ext4_should_journal_data(path.dentry->d_inode)) {
3937 /*
3938 * We don't need to lock updates but journal_flush() could
3939 * otherwise be livelocked...
3940 */
3941 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3942 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3943 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3944 if (err) {
3945 path_put(&path);
3946 return err;
3947 }
3948 }
3949
3950 err = vfs_quota_on_path(sb, type, format_id, &path);
3951 path_put(&path);
3952 return err;
3953 }
3954
3955 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3956 * acquiring the locks... As quota files are never truncated and quota code
3957 * itself serializes the operations (and noone else should touch the files)
3958 * we don't have to be afraid of races */
3959 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3960 size_t len, loff_t off)
3961 {
3962 struct inode *inode = sb_dqopt(sb)->files[type];
3963 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3964 int err = 0;
3965 int offset = off & (sb->s_blocksize - 1);
3966 int tocopy;
3967 size_t toread;
3968 struct buffer_head *bh;
3969 loff_t i_size = i_size_read(inode);
3970
3971 if (off > i_size)
3972 return 0;
3973 if (off+len > i_size)
3974 len = i_size-off;
3975 toread = len;
3976 while (toread > 0) {
3977 tocopy = sb->s_blocksize - offset < toread ?
3978 sb->s_blocksize - offset : toread;
3979 bh = ext4_bread(NULL, inode, blk, 0, &err);
3980 if (err)
3981 return err;
3982 if (!bh) /* A hole? */
3983 memset(data, 0, tocopy);
3984 else
3985 memcpy(data, bh->b_data+offset, tocopy);
3986 brelse(bh);
3987 offset = 0;
3988 toread -= tocopy;
3989 data += tocopy;
3990 blk++;
3991 }
3992 return len;
3993 }
3994
3995 /* Write to quotafile (we know the transaction is already started and has
3996 * enough credits) */
3997 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3998 const char *data, size_t len, loff_t off)
3999 {
4000 struct inode *inode = sb_dqopt(sb)->files[type];
4001 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4002 int err = 0;
4003 int offset = off & (sb->s_blocksize - 1);
4004 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
4005 struct buffer_head *bh;
4006 handle_t *handle = journal_current_handle();
4007
4008 if (EXT4_SB(sb)->s_journal && !handle) {
4009 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4010 " cancelled because transaction is not started",
4011 (unsigned long long)off, (unsigned long long)len);
4012 return -EIO;
4013 }
4014 /*
4015 * Since we account only one data block in transaction credits,
4016 * then it is impossible to cross a block boundary.
4017 */
4018 if (sb->s_blocksize - offset < len) {
4019 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4020 " cancelled because not block aligned",
4021 (unsigned long long)off, (unsigned long long)len);
4022 return -EIO;
4023 }
4024
4025 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4026 bh = ext4_bread(handle, inode, blk, 1, &err);
4027 if (!bh)
4028 goto out;
4029 if (journal_quota) {
4030 err = ext4_journal_get_write_access(handle, bh);
4031 if (err) {
4032 brelse(bh);
4033 goto out;
4034 }
4035 }
4036 lock_buffer(bh);
4037 memcpy(bh->b_data+offset, data, len);
4038 flush_dcache_page(bh->b_page);
4039 unlock_buffer(bh);
4040 if (journal_quota)
4041 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4042 else {
4043 /* Always do at least ordered writes for quotas */
4044 err = ext4_jbd2_file_inode(handle, inode);
4045 mark_buffer_dirty(bh);
4046 }
4047 brelse(bh);
4048 out:
4049 if (err) {
4050 mutex_unlock(&inode->i_mutex);
4051 return err;
4052 }
4053 if (inode->i_size < off + len) {
4054 i_size_write(inode, off + len);
4055 EXT4_I(inode)->i_disksize = inode->i_size;
4056 }
4057 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4058 ext4_mark_inode_dirty(handle, inode);
4059 mutex_unlock(&inode->i_mutex);
4060 return len;
4061 }
4062
4063 #endif
4064
4065 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
4066 const char *dev_name, void *data, struct vfsmount *mnt)
4067 {
4068 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
4069 }
4070
4071 #if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4072 static struct file_system_type ext2_fs_type = {
4073 .owner = THIS_MODULE,
4074 .name = "ext2",
4075 .get_sb = ext4_get_sb,
4076 .kill_sb = kill_block_super,
4077 .fs_flags = FS_REQUIRES_DEV,
4078 };
4079
4080 static inline void register_as_ext2(void)
4081 {
4082 int err = register_filesystem(&ext2_fs_type);
4083 if (err)
4084 printk(KERN_WARNING
4085 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4086 }
4087
4088 static inline void unregister_as_ext2(void)
4089 {
4090 unregister_filesystem(&ext2_fs_type);
4091 }
4092 MODULE_ALIAS("ext2");
4093 #else
4094 static inline void register_as_ext2(void) { }
4095 static inline void unregister_as_ext2(void) { }
4096 #endif
4097
4098 #if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4099 static struct file_system_type ext3_fs_type = {
4100 .owner = THIS_MODULE,
4101 .name = "ext3",
4102 .get_sb = ext4_get_sb,
4103 .kill_sb = kill_block_super,
4104 .fs_flags = FS_REQUIRES_DEV,
4105 };
4106
4107 static inline void register_as_ext3(void)
4108 {
4109 int err = register_filesystem(&ext3_fs_type);
4110 if (err)
4111 printk(KERN_WARNING
4112 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4113 }
4114
4115 static inline void unregister_as_ext3(void)
4116 {
4117 unregister_filesystem(&ext3_fs_type);
4118 }
4119 MODULE_ALIAS("ext3");
4120 #else
4121 static inline void register_as_ext3(void) { }
4122 static inline void unregister_as_ext3(void) { }
4123 #endif
4124
4125 static struct file_system_type ext4_fs_type = {
4126 .owner = THIS_MODULE,
4127 .name = "ext4",
4128 .get_sb = ext4_get_sb,
4129 .kill_sb = kill_block_super,
4130 .fs_flags = FS_REQUIRES_DEV,
4131 };
4132
4133 static int __init init_ext4_fs(void)
4134 {
4135 int err;
4136
4137 err = init_ext4_system_zone();
4138 if (err)
4139 return err;
4140 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4141 if (!ext4_kset)
4142 goto out4;
4143 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4144 err = init_ext4_mballoc();
4145 if (err)
4146 goto out3;
4147
4148 err = init_ext4_xattr();
4149 if (err)
4150 goto out2;
4151 err = init_inodecache();
4152 if (err)
4153 goto out1;
4154 register_as_ext2();
4155 register_as_ext3();
4156 err = register_filesystem(&ext4_fs_type);
4157 if (err)
4158 goto out;
4159 return 0;
4160 out:
4161 unregister_as_ext2();
4162 unregister_as_ext3();
4163 destroy_inodecache();
4164 out1:
4165 exit_ext4_xattr();
4166 out2:
4167 exit_ext4_mballoc();
4168 out3:
4169 remove_proc_entry("fs/ext4", NULL);
4170 kset_unregister(ext4_kset);
4171 out4:
4172 exit_ext4_system_zone();
4173 return err;
4174 }
4175
4176 static void __exit exit_ext4_fs(void)
4177 {
4178 unregister_as_ext2();
4179 unregister_as_ext3();
4180 unregister_filesystem(&ext4_fs_type);
4181 destroy_inodecache();
4182 exit_ext4_xattr();
4183 exit_ext4_mballoc();
4184 remove_proc_entry("fs/ext4", NULL);
4185 kset_unregister(ext4_kset);
4186 exit_ext4_system_zone();
4187 }
4188
4189 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4190 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4191 MODULE_LICENSE("GPL");
4192 module_init(init_ext4_fs)
4193 module_exit(exit_ext4_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree