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[deliverable/linux.git] / fs / ext4 / super.c
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/jbd2.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/parser.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/log2.h>
38 #include <linux/crc16.h>
39 #include <asm/uaccess.h>
40
41 #include "ext4.h"
42 #include "ext4_jbd2.h"
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46 #include "group.h"
47
48 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
49 unsigned long journal_devnum);
50 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
51 unsigned int);
52 static void ext4_commit_super (struct super_block * sb,
53 struct ext4_super_block * es,
54 int sync);
55 static void ext4_mark_recovery_complete(struct super_block * sb,
56 struct ext4_super_block * es);
57 static void ext4_clear_journal_err(struct super_block * sb,
58 struct ext4_super_block * es);
59 static int ext4_sync_fs(struct super_block *sb, int wait);
60 static const char *ext4_decode_error(struct super_block * sb, int errno,
61 char nbuf[16]);
62 static int ext4_remount (struct super_block * sb, int * flags, char * data);
63 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
64 static void ext4_unlockfs(struct super_block *sb);
65 static void ext4_write_super (struct super_block * sb);
66 static void ext4_write_super_lockfs(struct super_block *sb);
67
68
69 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
70 struct ext4_group_desc *bg)
71 {
72 return le32_to_cpu(bg->bg_block_bitmap_lo) |
73 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
74 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
75 }
76
77 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
78 struct ext4_group_desc *bg)
79 {
80 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
81 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
82 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
83 }
84
85 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
86 struct ext4_group_desc *bg)
87 {
88 return le32_to_cpu(bg->bg_inode_table_lo) |
89 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
90 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
91 }
92
93 void ext4_block_bitmap_set(struct super_block *sb,
94 struct ext4_group_desc *bg, ext4_fsblk_t blk)
95 {
96 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
97 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
98 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
99 }
100
101 void ext4_inode_bitmap_set(struct super_block *sb,
102 struct ext4_group_desc *bg, ext4_fsblk_t blk)
103 {
104 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
105 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
106 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
107 }
108
109 void ext4_inode_table_set(struct super_block *sb,
110 struct ext4_group_desc *bg, ext4_fsblk_t blk)
111 {
112 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
113 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
114 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
115 }
116
117 /*
118 * Wrappers for jbd2_journal_start/end.
119 *
120 * The only special thing we need to do here is to make sure that all
121 * journal_end calls result in the superblock being marked dirty, so
122 * that sync() will call the filesystem's write_super callback if
123 * appropriate.
124 */
125 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
126 {
127 journal_t *journal;
128
129 if (sb->s_flags & MS_RDONLY)
130 return ERR_PTR(-EROFS);
131
132 /* Special case here: if the journal has aborted behind our
133 * backs (eg. EIO in the commit thread), then we still need to
134 * take the FS itself readonly cleanly. */
135 journal = EXT4_SB(sb)->s_journal;
136 if (is_journal_aborted(journal)) {
137 ext4_abort(sb, __func__,
138 "Detected aborted journal");
139 return ERR_PTR(-EROFS);
140 }
141
142 return jbd2_journal_start(journal, nblocks);
143 }
144
145 /*
146 * The only special thing we need to do here is to make sure that all
147 * jbd2_journal_stop calls result in the superblock being marked dirty, so
148 * that sync() will call the filesystem's write_super callback if
149 * appropriate.
150 */
151 int __ext4_journal_stop(const char *where, handle_t *handle)
152 {
153 struct super_block *sb;
154 int err;
155 int rc;
156
157 sb = handle->h_transaction->t_journal->j_private;
158 err = handle->h_err;
159 rc = jbd2_journal_stop(handle);
160
161 if (!err)
162 err = rc;
163 if (err)
164 __ext4_std_error(sb, where, err);
165 return err;
166 }
167
168 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
169 struct buffer_head *bh, handle_t *handle, int err)
170 {
171 char nbuf[16];
172 const char *errstr = ext4_decode_error(NULL, err, nbuf);
173
174 if (bh)
175 BUFFER_TRACE(bh, "abort");
176
177 if (!handle->h_err)
178 handle->h_err = err;
179
180 if (is_handle_aborted(handle))
181 return;
182
183 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
184 caller, errstr, err_fn);
185
186 jbd2_journal_abort_handle(handle);
187 }
188
189 /* Deal with the reporting of failure conditions on a filesystem such as
190 * inconsistencies detected or read IO failures.
191 *
192 * On ext2, we can store the error state of the filesystem in the
193 * superblock. That is not possible on ext4, because we may have other
194 * write ordering constraints on the superblock which prevent us from
195 * writing it out straight away; and given that the journal is about to
196 * be aborted, we can't rely on the current, or future, transactions to
197 * write out the superblock safely.
198 *
199 * We'll just use the jbd2_journal_abort() error code to record an error in
200 * the journal instead. On recovery, the journal will compain about
201 * that error until we've noted it down and cleared it.
202 */
203
204 static void ext4_handle_error(struct super_block *sb)
205 {
206 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
207
208 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
209 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
210
211 if (sb->s_flags & MS_RDONLY)
212 return;
213
214 if (!test_opt (sb, ERRORS_CONT)) {
215 journal_t *journal = EXT4_SB(sb)->s_journal;
216
217 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
218 if (journal)
219 jbd2_journal_abort(journal, -EIO);
220 }
221 if (test_opt (sb, ERRORS_RO)) {
222 printk (KERN_CRIT "Remounting filesystem read-only\n");
223 sb->s_flags |= MS_RDONLY;
224 }
225 ext4_commit_super(sb, es, 1);
226 if (test_opt(sb, ERRORS_PANIC))
227 panic("EXT4-fs (device %s): panic forced after error\n",
228 sb->s_id);
229 }
230
231 void ext4_error (struct super_block * sb, const char * function,
232 const char * fmt, ...)
233 {
234 va_list args;
235
236 va_start(args, fmt);
237 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
238 vprintk(fmt, args);
239 printk("\n");
240 va_end(args);
241
242 ext4_handle_error(sb);
243 }
244
245 static const char *ext4_decode_error(struct super_block * sb, int errno,
246 char nbuf[16])
247 {
248 char *errstr = NULL;
249
250 switch (errno) {
251 case -EIO:
252 errstr = "IO failure";
253 break;
254 case -ENOMEM:
255 errstr = "Out of memory";
256 break;
257 case -EROFS:
258 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
259 errstr = "Journal has aborted";
260 else
261 errstr = "Readonly filesystem";
262 break;
263 default:
264 /* If the caller passed in an extra buffer for unknown
265 * errors, textualise them now. Else we just return
266 * NULL. */
267 if (nbuf) {
268 /* Check for truncated error codes... */
269 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
270 errstr = nbuf;
271 }
272 break;
273 }
274
275 return errstr;
276 }
277
278 /* __ext4_std_error decodes expected errors from journaling functions
279 * automatically and invokes the appropriate error response. */
280
281 void __ext4_std_error (struct super_block * sb, const char * function,
282 int errno)
283 {
284 char nbuf[16];
285 const char *errstr;
286
287 /* Special case: if the error is EROFS, and we're not already
288 * inside a transaction, then there's really no point in logging
289 * an error. */
290 if (errno == -EROFS && journal_current_handle() == NULL &&
291 (sb->s_flags & MS_RDONLY))
292 return;
293
294 errstr = ext4_decode_error(sb, errno, nbuf);
295 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
296 sb->s_id, function, errstr);
297
298 ext4_handle_error(sb);
299 }
300
301 /*
302 * ext4_abort is a much stronger failure handler than ext4_error. The
303 * abort function may be used to deal with unrecoverable failures such
304 * as journal IO errors or ENOMEM at a critical moment in log management.
305 *
306 * We unconditionally force the filesystem into an ABORT|READONLY state,
307 * unless the error response on the fs has been set to panic in which
308 * case we take the easy way out and panic immediately.
309 */
310
311 void ext4_abort (struct super_block * sb, const char * function,
312 const char * fmt, ...)
313 {
314 va_list args;
315
316 printk (KERN_CRIT "ext4_abort called.\n");
317
318 va_start(args, fmt);
319 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
320 vprintk(fmt, args);
321 printk("\n");
322 va_end(args);
323
324 if (test_opt(sb, ERRORS_PANIC))
325 panic("EXT4-fs panic from previous error\n");
326
327 if (sb->s_flags & MS_RDONLY)
328 return;
329
330 printk(KERN_CRIT "Remounting filesystem read-only\n");
331 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
332 sb->s_flags |= MS_RDONLY;
333 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
334 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
335 }
336
337 void ext4_warning (struct super_block * sb, const char * function,
338 const char * fmt, ...)
339 {
340 va_list args;
341
342 va_start(args, fmt);
343 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
344 sb->s_id, function);
345 vprintk(fmt, args);
346 printk("\n");
347 va_end(args);
348 }
349
350 void ext4_update_dynamic_rev(struct super_block *sb)
351 {
352 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
353
354 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
355 return;
356
357 ext4_warning(sb, __func__,
358 "updating to rev %d because of new feature flag, "
359 "running e2fsck is recommended",
360 EXT4_DYNAMIC_REV);
361
362 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
363 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
364 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
365 /* leave es->s_feature_*compat flags alone */
366 /* es->s_uuid will be set by e2fsck if empty */
367
368 /*
369 * The rest of the superblock fields should be zero, and if not it
370 * means they are likely already in use, so leave them alone. We
371 * can leave it up to e2fsck to clean up any inconsistencies there.
372 */
373 }
374
375 int ext4_update_compat_feature(handle_t *handle,
376 struct super_block *sb, __u32 compat)
377 {
378 int err = 0;
379 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
380 err = ext4_journal_get_write_access(handle,
381 EXT4_SB(sb)->s_sbh);
382 if (err)
383 return err;
384 EXT4_SET_COMPAT_FEATURE(sb, compat);
385 sb->s_dirt = 1;
386 handle->h_sync = 1;
387 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
388 "call ext4_journal_dirty_met adata");
389 err = ext4_journal_dirty_metadata(handle,
390 EXT4_SB(sb)->s_sbh);
391 }
392 return err;
393 }
394
395 int ext4_update_rocompat_feature(handle_t *handle,
396 struct super_block *sb, __u32 rocompat)
397 {
398 int err = 0;
399 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
400 err = ext4_journal_get_write_access(handle,
401 EXT4_SB(sb)->s_sbh);
402 if (err)
403 return err;
404 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
405 sb->s_dirt = 1;
406 handle->h_sync = 1;
407 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
408 "call ext4_journal_dirty_met adata");
409 err = ext4_journal_dirty_metadata(handle,
410 EXT4_SB(sb)->s_sbh);
411 }
412 return err;
413 }
414
415 int ext4_update_incompat_feature(handle_t *handle,
416 struct super_block *sb, __u32 incompat)
417 {
418 int err = 0;
419 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
420 err = ext4_journal_get_write_access(handle,
421 EXT4_SB(sb)->s_sbh);
422 if (err)
423 return err;
424 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
425 sb->s_dirt = 1;
426 handle->h_sync = 1;
427 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
428 "call ext4_journal_dirty_met adata");
429 err = ext4_journal_dirty_metadata(handle,
430 EXT4_SB(sb)->s_sbh);
431 }
432 return err;
433 }
434
435 /*
436 * Open the external journal device
437 */
438 static struct block_device *ext4_blkdev_get(dev_t dev)
439 {
440 struct block_device *bdev;
441 char b[BDEVNAME_SIZE];
442
443 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
444 if (IS_ERR(bdev))
445 goto fail;
446 return bdev;
447
448 fail:
449 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
450 __bdevname(dev, b), PTR_ERR(bdev));
451 return NULL;
452 }
453
454 /*
455 * Release the journal device
456 */
457 static int ext4_blkdev_put(struct block_device *bdev)
458 {
459 bd_release(bdev);
460 return blkdev_put(bdev);
461 }
462
463 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
464 {
465 struct block_device *bdev;
466 int ret = -ENODEV;
467
468 bdev = sbi->journal_bdev;
469 if (bdev) {
470 ret = ext4_blkdev_put(bdev);
471 sbi->journal_bdev = NULL;
472 }
473 return ret;
474 }
475
476 static inline struct inode *orphan_list_entry(struct list_head *l)
477 {
478 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
479 }
480
481 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
482 {
483 struct list_head *l;
484
485 printk(KERN_ERR "sb orphan head is %d\n",
486 le32_to_cpu(sbi->s_es->s_last_orphan));
487
488 printk(KERN_ERR "sb_info orphan list:\n");
489 list_for_each(l, &sbi->s_orphan) {
490 struct inode *inode = orphan_list_entry(l);
491 printk(KERN_ERR " "
492 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
493 inode->i_sb->s_id, inode->i_ino, inode,
494 inode->i_mode, inode->i_nlink,
495 NEXT_ORPHAN(inode));
496 }
497 }
498
499 static void ext4_put_super (struct super_block * sb)
500 {
501 struct ext4_sb_info *sbi = EXT4_SB(sb);
502 struct ext4_super_block *es = sbi->s_es;
503 int i;
504
505 ext4_mb_release(sb);
506 ext4_ext_release(sb);
507 ext4_xattr_put_super(sb);
508 jbd2_journal_destroy(sbi->s_journal);
509 if (!(sb->s_flags & MS_RDONLY)) {
510 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
511 es->s_state = cpu_to_le16(sbi->s_mount_state);
512 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
513 mark_buffer_dirty(sbi->s_sbh);
514 ext4_commit_super(sb, es, 1);
515 }
516
517 for (i = 0; i < sbi->s_gdb_count; i++)
518 brelse(sbi->s_group_desc[i]);
519 kfree(sbi->s_group_desc);
520 percpu_counter_destroy(&sbi->s_freeblocks_counter);
521 percpu_counter_destroy(&sbi->s_freeinodes_counter);
522 percpu_counter_destroy(&sbi->s_dirs_counter);
523 brelse(sbi->s_sbh);
524 #ifdef CONFIG_QUOTA
525 for (i = 0; i < MAXQUOTAS; i++)
526 kfree(sbi->s_qf_names[i]);
527 #endif
528
529 /* Debugging code just in case the in-memory inode orphan list
530 * isn't empty. The on-disk one can be non-empty if we've
531 * detected an error and taken the fs readonly, but the
532 * in-memory list had better be clean by this point. */
533 if (!list_empty(&sbi->s_orphan))
534 dump_orphan_list(sb, sbi);
535 J_ASSERT(list_empty(&sbi->s_orphan));
536
537 invalidate_bdev(sb->s_bdev);
538 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
539 /*
540 * Invalidate the journal device's buffers. We don't want them
541 * floating about in memory - the physical journal device may
542 * hotswapped, and it breaks the `ro-after' testing code.
543 */
544 sync_blockdev(sbi->journal_bdev);
545 invalidate_bdev(sbi->journal_bdev);
546 ext4_blkdev_remove(sbi);
547 }
548 sb->s_fs_info = NULL;
549 kfree(sbi);
550 return;
551 }
552
553 static struct kmem_cache *ext4_inode_cachep;
554
555 /*
556 * Called inside transaction, so use GFP_NOFS
557 */
558 static struct inode *ext4_alloc_inode(struct super_block *sb)
559 {
560 struct ext4_inode_info *ei;
561
562 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
563 if (!ei)
564 return NULL;
565 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
566 ei->i_acl = EXT4_ACL_NOT_CACHED;
567 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
568 #endif
569 ei->i_block_alloc_info = NULL;
570 ei->vfs_inode.i_version = 1;
571 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
572 INIT_LIST_HEAD(&ei->i_prealloc_list);
573 spin_lock_init(&ei->i_prealloc_lock);
574 return &ei->vfs_inode;
575 }
576
577 static void ext4_destroy_inode(struct inode *inode)
578 {
579 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
580 printk("EXT4 Inode %p: orphan list check failed!\n",
581 EXT4_I(inode));
582 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
583 EXT4_I(inode), sizeof(struct ext4_inode_info),
584 true);
585 dump_stack();
586 }
587 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
588 }
589
590 static void init_once(struct kmem_cache *cachep, void *foo)
591 {
592 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
593
594 INIT_LIST_HEAD(&ei->i_orphan);
595 #ifdef CONFIG_EXT4DEV_FS_XATTR
596 init_rwsem(&ei->xattr_sem);
597 #endif
598 init_rwsem(&ei->i_data_sem);
599 inode_init_once(&ei->vfs_inode);
600 }
601
602 static int init_inodecache(void)
603 {
604 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
605 sizeof(struct ext4_inode_info),
606 0, (SLAB_RECLAIM_ACCOUNT|
607 SLAB_MEM_SPREAD),
608 init_once);
609 if (ext4_inode_cachep == NULL)
610 return -ENOMEM;
611 return 0;
612 }
613
614 static void destroy_inodecache(void)
615 {
616 kmem_cache_destroy(ext4_inode_cachep);
617 }
618
619 static void ext4_clear_inode(struct inode *inode)
620 {
621 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
622 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
623 if (EXT4_I(inode)->i_acl &&
624 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
625 posix_acl_release(EXT4_I(inode)->i_acl);
626 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
627 }
628 if (EXT4_I(inode)->i_default_acl &&
629 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
630 posix_acl_release(EXT4_I(inode)->i_default_acl);
631 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
632 }
633 #endif
634 ext4_discard_reservation(inode);
635 EXT4_I(inode)->i_block_alloc_info = NULL;
636 if (unlikely(rsv))
637 kfree(rsv);
638 }
639
640 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
641 {
642 #if defined(CONFIG_QUOTA)
643 struct ext4_sb_info *sbi = EXT4_SB(sb);
644
645 if (sbi->s_jquota_fmt)
646 seq_printf(seq, ",jqfmt=%s",
647 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
648
649 if (sbi->s_qf_names[USRQUOTA])
650 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
651
652 if (sbi->s_qf_names[GRPQUOTA])
653 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
654
655 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
656 seq_puts(seq, ",usrquota");
657
658 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
659 seq_puts(seq, ",grpquota");
660 #endif
661 }
662
663 /*
664 * Show an option if
665 * - it's set to a non-default value OR
666 * - if the per-sb default is different from the global default
667 */
668 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
669 {
670 int def_errors;
671 unsigned long def_mount_opts;
672 struct super_block *sb = vfs->mnt_sb;
673 struct ext4_sb_info *sbi = EXT4_SB(sb);
674 struct ext4_super_block *es = sbi->s_es;
675
676 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
677 def_errors = le16_to_cpu(es->s_errors);
678
679 if (sbi->s_sb_block != 1)
680 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
681 if (test_opt(sb, MINIX_DF))
682 seq_puts(seq, ",minixdf");
683 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
684 seq_puts(seq, ",grpid");
685 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
686 seq_puts(seq, ",nogrpid");
687 if (sbi->s_resuid != EXT4_DEF_RESUID ||
688 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
689 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
690 }
691 if (sbi->s_resgid != EXT4_DEF_RESGID ||
692 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
693 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
694 }
695 if (test_opt(sb, ERRORS_RO)) {
696 if (def_errors == EXT4_ERRORS_PANIC ||
697 def_errors == EXT4_ERRORS_CONTINUE) {
698 seq_puts(seq, ",errors=remount-ro");
699 }
700 }
701 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
702 seq_puts(seq, ",errors=continue");
703 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
704 seq_puts(seq, ",errors=panic");
705 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
706 seq_puts(seq, ",nouid32");
707 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
708 seq_puts(seq, ",debug");
709 if (test_opt(sb, OLDALLOC))
710 seq_puts(seq, ",oldalloc");
711 #ifdef CONFIG_EXT4DEV_FS_XATTR
712 if (test_opt(sb, XATTR_USER) &&
713 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
714 seq_puts(seq, ",user_xattr");
715 if (!test_opt(sb, XATTR_USER) &&
716 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
717 seq_puts(seq, ",nouser_xattr");
718 }
719 #endif
720 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
721 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
722 seq_puts(seq, ",acl");
723 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
724 seq_puts(seq, ",noacl");
725 #endif
726 if (!test_opt(sb, RESERVATION))
727 seq_puts(seq, ",noreservation");
728 if (sbi->s_commit_interval) {
729 seq_printf(seq, ",commit=%u",
730 (unsigned) (sbi->s_commit_interval / HZ));
731 }
732 if (test_opt(sb, BARRIER))
733 seq_puts(seq, ",barrier=1");
734 if (test_opt(sb, NOBH))
735 seq_puts(seq, ",nobh");
736 if (!test_opt(sb, EXTENTS))
737 seq_puts(seq, ",noextents");
738 if (!test_opt(sb, MBALLOC))
739 seq_puts(seq, ",nomballoc");
740 if (test_opt(sb, I_VERSION))
741 seq_puts(seq, ",i_version");
742
743 if (sbi->s_stripe)
744 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
745 /*
746 * journal mode get enabled in different ways
747 * So just print the value even if we didn't specify it
748 */
749 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
750 seq_puts(seq, ",data=journal");
751 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
752 seq_puts(seq, ",data=ordered");
753 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
754 seq_puts(seq, ",data=writeback");
755
756 ext4_show_quota_options(seq, sb);
757 return 0;
758 }
759
760
761 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
762 u64 ino, u32 generation)
763 {
764 struct inode *inode;
765
766 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
767 return ERR_PTR(-ESTALE);
768 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
769 return ERR_PTR(-ESTALE);
770
771 /* iget isn't really right if the inode is currently unallocated!!
772 *
773 * ext4_read_inode will return a bad_inode if the inode had been
774 * deleted, so we should be safe.
775 *
776 * Currently we don't know the generation for parent directory, so
777 * a generation of 0 means "accept any"
778 */
779 inode = ext4_iget(sb, ino);
780 if (IS_ERR(inode))
781 return ERR_CAST(inode);
782 if (generation && inode->i_generation != generation) {
783 iput(inode);
784 return ERR_PTR(-ESTALE);
785 }
786
787 return inode;
788 }
789
790 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
791 int fh_len, int fh_type)
792 {
793 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
794 ext4_nfs_get_inode);
795 }
796
797 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
798 int fh_len, int fh_type)
799 {
800 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
801 ext4_nfs_get_inode);
802 }
803
804 #ifdef CONFIG_QUOTA
805 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
806 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
807
808 static int ext4_dquot_initialize(struct inode *inode, int type);
809 static int ext4_dquot_drop(struct inode *inode);
810 static int ext4_write_dquot(struct dquot *dquot);
811 static int ext4_acquire_dquot(struct dquot *dquot);
812 static int ext4_release_dquot(struct dquot *dquot);
813 static int ext4_mark_dquot_dirty(struct dquot *dquot);
814 static int ext4_write_info(struct super_block *sb, int type);
815 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
816 char *path, int remount);
817 static int ext4_quota_on_mount(struct super_block *sb, int type);
818 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
819 size_t len, loff_t off);
820 static ssize_t ext4_quota_write(struct super_block *sb, int type,
821 const char *data, size_t len, loff_t off);
822
823 static struct dquot_operations ext4_quota_operations = {
824 .initialize = ext4_dquot_initialize,
825 .drop = ext4_dquot_drop,
826 .alloc_space = dquot_alloc_space,
827 .alloc_inode = dquot_alloc_inode,
828 .free_space = dquot_free_space,
829 .free_inode = dquot_free_inode,
830 .transfer = dquot_transfer,
831 .write_dquot = ext4_write_dquot,
832 .acquire_dquot = ext4_acquire_dquot,
833 .release_dquot = ext4_release_dquot,
834 .mark_dirty = ext4_mark_dquot_dirty,
835 .write_info = ext4_write_info
836 };
837
838 static struct quotactl_ops ext4_qctl_operations = {
839 .quota_on = ext4_quota_on,
840 .quota_off = vfs_quota_off,
841 .quota_sync = vfs_quota_sync,
842 .get_info = vfs_get_dqinfo,
843 .set_info = vfs_set_dqinfo,
844 .get_dqblk = vfs_get_dqblk,
845 .set_dqblk = vfs_set_dqblk
846 };
847 #endif
848
849 static const struct super_operations ext4_sops = {
850 .alloc_inode = ext4_alloc_inode,
851 .destroy_inode = ext4_destroy_inode,
852 .write_inode = ext4_write_inode,
853 .dirty_inode = ext4_dirty_inode,
854 .delete_inode = ext4_delete_inode,
855 .put_super = ext4_put_super,
856 .write_super = ext4_write_super,
857 .sync_fs = ext4_sync_fs,
858 .write_super_lockfs = ext4_write_super_lockfs,
859 .unlockfs = ext4_unlockfs,
860 .statfs = ext4_statfs,
861 .remount_fs = ext4_remount,
862 .clear_inode = ext4_clear_inode,
863 .show_options = ext4_show_options,
864 #ifdef CONFIG_QUOTA
865 .quota_read = ext4_quota_read,
866 .quota_write = ext4_quota_write,
867 #endif
868 };
869
870 static const struct export_operations ext4_export_ops = {
871 .fh_to_dentry = ext4_fh_to_dentry,
872 .fh_to_parent = ext4_fh_to_parent,
873 .get_parent = ext4_get_parent,
874 };
875
876 enum {
877 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
878 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
879 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
880 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
881 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
882 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
883 Opt_journal_checksum, Opt_journal_async_commit,
884 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
885 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
886 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
887 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
888 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
889 Opt_mballoc, Opt_nomballoc, Opt_stripe,
890 };
891
892 static match_table_t tokens = {
893 {Opt_bsd_df, "bsddf"},
894 {Opt_minix_df, "minixdf"},
895 {Opt_grpid, "grpid"},
896 {Opt_grpid, "bsdgroups"},
897 {Opt_nogrpid, "nogrpid"},
898 {Opt_nogrpid, "sysvgroups"},
899 {Opt_resgid, "resgid=%u"},
900 {Opt_resuid, "resuid=%u"},
901 {Opt_sb, "sb=%u"},
902 {Opt_err_cont, "errors=continue"},
903 {Opt_err_panic, "errors=panic"},
904 {Opt_err_ro, "errors=remount-ro"},
905 {Opt_nouid32, "nouid32"},
906 {Opt_nocheck, "nocheck"},
907 {Opt_nocheck, "check=none"},
908 {Opt_debug, "debug"},
909 {Opt_oldalloc, "oldalloc"},
910 {Opt_orlov, "orlov"},
911 {Opt_user_xattr, "user_xattr"},
912 {Opt_nouser_xattr, "nouser_xattr"},
913 {Opt_acl, "acl"},
914 {Opt_noacl, "noacl"},
915 {Opt_reservation, "reservation"},
916 {Opt_noreservation, "noreservation"},
917 {Opt_noload, "noload"},
918 {Opt_nobh, "nobh"},
919 {Opt_bh, "bh"},
920 {Opt_commit, "commit=%u"},
921 {Opt_journal_update, "journal=update"},
922 {Opt_journal_inum, "journal=%u"},
923 {Opt_journal_dev, "journal_dev=%u"},
924 {Opt_journal_checksum, "journal_checksum"},
925 {Opt_journal_async_commit, "journal_async_commit"},
926 {Opt_abort, "abort"},
927 {Opt_data_journal, "data=journal"},
928 {Opt_data_ordered, "data=ordered"},
929 {Opt_data_writeback, "data=writeback"},
930 {Opt_offusrjquota, "usrjquota="},
931 {Opt_usrjquota, "usrjquota=%s"},
932 {Opt_offgrpjquota, "grpjquota="},
933 {Opt_grpjquota, "grpjquota=%s"},
934 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
935 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
936 {Opt_grpquota, "grpquota"},
937 {Opt_noquota, "noquota"},
938 {Opt_quota, "quota"},
939 {Opt_usrquota, "usrquota"},
940 {Opt_barrier, "barrier=%u"},
941 {Opt_extents, "extents"},
942 {Opt_noextents, "noextents"},
943 {Opt_i_version, "i_version"},
944 {Opt_mballoc, "mballoc"},
945 {Opt_nomballoc, "nomballoc"},
946 {Opt_stripe, "stripe=%u"},
947 {Opt_resize, "resize"},
948 {Opt_err, NULL},
949 };
950
951 static ext4_fsblk_t get_sb_block(void **data)
952 {
953 ext4_fsblk_t sb_block;
954 char *options = (char *) *data;
955
956 if (!options || strncmp(options, "sb=", 3) != 0)
957 return 1; /* Default location */
958 options += 3;
959 /*todo: use simple_strtoll with >32bit ext4 */
960 sb_block = simple_strtoul(options, &options, 0);
961 if (*options && *options != ',') {
962 printk("EXT4-fs: Invalid sb specification: %s\n",
963 (char *) *data);
964 return 1;
965 }
966 if (*options == ',')
967 options++;
968 *data = (void *) options;
969 return sb_block;
970 }
971
972 static int parse_options (char *options, struct super_block *sb,
973 unsigned int *inum, unsigned long *journal_devnum,
974 ext4_fsblk_t *n_blocks_count, int is_remount)
975 {
976 struct ext4_sb_info *sbi = EXT4_SB(sb);
977 char * p;
978 substring_t args[MAX_OPT_ARGS];
979 int data_opt = 0;
980 int option;
981 #ifdef CONFIG_QUOTA
982 int qtype, qfmt;
983 char *qname;
984 #endif
985
986 if (!options)
987 return 1;
988
989 while ((p = strsep (&options, ",")) != NULL) {
990 int token;
991 if (!*p)
992 continue;
993
994 token = match_token(p, tokens, args);
995 switch (token) {
996 case Opt_bsd_df:
997 clear_opt (sbi->s_mount_opt, MINIX_DF);
998 break;
999 case Opt_minix_df:
1000 set_opt (sbi->s_mount_opt, MINIX_DF);
1001 break;
1002 case Opt_grpid:
1003 set_opt (sbi->s_mount_opt, GRPID);
1004 break;
1005 case Opt_nogrpid:
1006 clear_opt (sbi->s_mount_opt, GRPID);
1007 break;
1008 case Opt_resuid:
1009 if (match_int(&args[0], &option))
1010 return 0;
1011 sbi->s_resuid = option;
1012 break;
1013 case Opt_resgid:
1014 if (match_int(&args[0], &option))
1015 return 0;
1016 sbi->s_resgid = option;
1017 break;
1018 case Opt_sb:
1019 /* handled by get_sb_block() instead of here */
1020 /* *sb_block = match_int(&args[0]); */
1021 break;
1022 case Opt_err_panic:
1023 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1024 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1025 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1026 break;
1027 case Opt_err_ro:
1028 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1029 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1030 set_opt (sbi->s_mount_opt, ERRORS_RO);
1031 break;
1032 case Opt_err_cont:
1033 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1034 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1035 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1036 break;
1037 case Opt_nouid32:
1038 set_opt (sbi->s_mount_opt, NO_UID32);
1039 break;
1040 case Opt_nocheck:
1041 clear_opt (sbi->s_mount_opt, CHECK);
1042 break;
1043 case Opt_debug:
1044 set_opt (sbi->s_mount_opt, DEBUG);
1045 break;
1046 case Opt_oldalloc:
1047 set_opt (sbi->s_mount_opt, OLDALLOC);
1048 break;
1049 case Opt_orlov:
1050 clear_opt (sbi->s_mount_opt, OLDALLOC);
1051 break;
1052 #ifdef CONFIG_EXT4DEV_FS_XATTR
1053 case Opt_user_xattr:
1054 set_opt (sbi->s_mount_opt, XATTR_USER);
1055 break;
1056 case Opt_nouser_xattr:
1057 clear_opt (sbi->s_mount_opt, XATTR_USER);
1058 break;
1059 #else
1060 case Opt_user_xattr:
1061 case Opt_nouser_xattr:
1062 printk("EXT4 (no)user_xattr options not supported\n");
1063 break;
1064 #endif
1065 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1066 case Opt_acl:
1067 set_opt(sbi->s_mount_opt, POSIX_ACL);
1068 break;
1069 case Opt_noacl:
1070 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1071 break;
1072 #else
1073 case Opt_acl:
1074 case Opt_noacl:
1075 printk("EXT4 (no)acl options not supported\n");
1076 break;
1077 #endif
1078 case Opt_reservation:
1079 set_opt(sbi->s_mount_opt, RESERVATION);
1080 break;
1081 case Opt_noreservation:
1082 clear_opt(sbi->s_mount_opt, RESERVATION);
1083 break;
1084 case Opt_journal_update:
1085 /* @@@ FIXME */
1086 /* Eventually we will want to be able to create
1087 a journal file here. For now, only allow the
1088 user to specify an existing inode to be the
1089 journal file. */
1090 if (is_remount) {
1091 printk(KERN_ERR "EXT4-fs: cannot specify "
1092 "journal on remount\n");
1093 return 0;
1094 }
1095 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1096 break;
1097 case Opt_journal_inum:
1098 if (is_remount) {
1099 printk(KERN_ERR "EXT4-fs: cannot specify "
1100 "journal on remount\n");
1101 return 0;
1102 }
1103 if (match_int(&args[0], &option))
1104 return 0;
1105 *inum = option;
1106 break;
1107 case Opt_journal_dev:
1108 if (is_remount) {
1109 printk(KERN_ERR "EXT4-fs: cannot specify "
1110 "journal on remount\n");
1111 return 0;
1112 }
1113 if (match_int(&args[0], &option))
1114 return 0;
1115 *journal_devnum = option;
1116 break;
1117 case Opt_journal_checksum:
1118 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1119 break;
1120 case Opt_journal_async_commit:
1121 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1122 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1123 break;
1124 case Opt_noload:
1125 set_opt (sbi->s_mount_opt, NOLOAD);
1126 break;
1127 case Opt_commit:
1128 if (match_int(&args[0], &option))
1129 return 0;
1130 if (option < 0)
1131 return 0;
1132 if (option == 0)
1133 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1134 sbi->s_commit_interval = HZ * option;
1135 break;
1136 case Opt_data_journal:
1137 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1138 goto datacheck;
1139 case Opt_data_ordered:
1140 data_opt = EXT4_MOUNT_ORDERED_DATA;
1141 goto datacheck;
1142 case Opt_data_writeback:
1143 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1144 datacheck:
1145 if (is_remount) {
1146 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1147 != data_opt) {
1148 printk(KERN_ERR
1149 "EXT4-fs: cannot change data "
1150 "mode on remount\n");
1151 return 0;
1152 }
1153 } else {
1154 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1155 sbi->s_mount_opt |= data_opt;
1156 }
1157 break;
1158 #ifdef CONFIG_QUOTA
1159 case Opt_usrjquota:
1160 qtype = USRQUOTA;
1161 goto set_qf_name;
1162 case Opt_grpjquota:
1163 qtype = GRPQUOTA;
1164 set_qf_name:
1165 if ((sb_any_quota_enabled(sb) ||
1166 sb_any_quota_suspended(sb)) &&
1167 !sbi->s_qf_names[qtype]) {
1168 printk(KERN_ERR
1169 "EXT4-fs: Cannot change journalled "
1170 "quota options when quota turned on.\n");
1171 return 0;
1172 }
1173 qname = match_strdup(&args[0]);
1174 if (!qname) {
1175 printk(KERN_ERR
1176 "EXT4-fs: not enough memory for "
1177 "storing quotafile name.\n");
1178 return 0;
1179 }
1180 if (sbi->s_qf_names[qtype] &&
1181 strcmp(sbi->s_qf_names[qtype], qname)) {
1182 printk(KERN_ERR
1183 "EXT4-fs: %s quota file already "
1184 "specified.\n", QTYPE2NAME(qtype));
1185 kfree(qname);
1186 return 0;
1187 }
1188 sbi->s_qf_names[qtype] = qname;
1189 if (strchr(sbi->s_qf_names[qtype], '/')) {
1190 printk(KERN_ERR
1191 "EXT4-fs: quotafile must be on "
1192 "filesystem root.\n");
1193 kfree(sbi->s_qf_names[qtype]);
1194 sbi->s_qf_names[qtype] = NULL;
1195 return 0;
1196 }
1197 set_opt(sbi->s_mount_opt, QUOTA);
1198 break;
1199 case Opt_offusrjquota:
1200 qtype = USRQUOTA;
1201 goto clear_qf_name;
1202 case Opt_offgrpjquota:
1203 qtype = GRPQUOTA;
1204 clear_qf_name:
1205 if ((sb_any_quota_enabled(sb) ||
1206 sb_any_quota_suspended(sb)) &&
1207 sbi->s_qf_names[qtype]) {
1208 printk(KERN_ERR "EXT4-fs: Cannot change "
1209 "journalled quota options when "
1210 "quota turned on.\n");
1211 return 0;
1212 }
1213 /*
1214 * The space will be released later when all options
1215 * are confirmed to be correct
1216 */
1217 sbi->s_qf_names[qtype] = NULL;
1218 break;
1219 case Opt_jqfmt_vfsold:
1220 qfmt = QFMT_VFS_OLD;
1221 goto set_qf_format;
1222 case Opt_jqfmt_vfsv0:
1223 qfmt = QFMT_VFS_V0;
1224 set_qf_format:
1225 if ((sb_any_quota_enabled(sb) ||
1226 sb_any_quota_suspended(sb)) &&
1227 sbi->s_jquota_fmt != qfmt) {
1228 printk(KERN_ERR "EXT4-fs: Cannot change "
1229 "journaled quota options when "
1230 "quota turned on.\n");
1231 return 0;
1232 }
1233 sbi->s_jquota_fmt = qfmt;
1234 break;
1235 case Opt_quota:
1236 case Opt_usrquota:
1237 set_opt(sbi->s_mount_opt, QUOTA);
1238 set_opt(sbi->s_mount_opt, USRQUOTA);
1239 break;
1240 case Opt_grpquota:
1241 set_opt(sbi->s_mount_opt, QUOTA);
1242 set_opt(sbi->s_mount_opt, GRPQUOTA);
1243 break;
1244 case Opt_noquota:
1245 if (sb_any_quota_enabled(sb)) {
1246 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1247 "options when quota turned on.\n");
1248 return 0;
1249 }
1250 clear_opt(sbi->s_mount_opt, QUOTA);
1251 clear_opt(sbi->s_mount_opt, USRQUOTA);
1252 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1253 break;
1254 #else
1255 case Opt_quota:
1256 case Opt_usrquota:
1257 case Opt_grpquota:
1258 case Opt_usrjquota:
1259 case Opt_grpjquota:
1260 case Opt_offusrjquota:
1261 case Opt_offgrpjquota:
1262 case Opt_jqfmt_vfsold:
1263 case Opt_jqfmt_vfsv0:
1264 printk(KERN_ERR
1265 "EXT4-fs: journalled quota options not "
1266 "supported.\n");
1267 break;
1268 case Opt_noquota:
1269 break;
1270 #endif
1271 case Opt_abort:
1272 set_opt(sbi->s_mount_opt, ABORT);
1273 break;
1274 case Opt_barrier:
1275 if (match_int(&args[0], &option))
1276 return 0;
1277 if (option)
1278 set_opt(sbi->s_mount_opt, BARRIER);
1279 else
1280 clear_opt(sbi->s_mount_opt, BARRIER);
1281 break;
1282 case Opt_ignore:
1283 break;
1284 case Opt_resize:
1285 if (!is_remount) {
1286 printk("EXT4-fs: resize option only available "
1287 "for remount\n");
1288 return 0;
1289 }
1290 if (match_int(&args[0], &option) != 0)
1291 return 0;
1292 *n_blocks_count = option;
1293 break;
1294 case Opt_nobh:
1295 set_opt(sbi->s_mount_opt, NOBH);
1296 break;
1297 case Opt_bh:
1298 clear_opt(sbi->s_mount_opt, NOBH);
1299 break;
1300 case Opt_extents:
1301 set_opt (sbi->s_mount_opt, EXTENTS);
1302 break;
1303 case Opt_noextents:
1304 clear_opt (sbi->s_mount_opt, EXTENTS);
1305 break;
1306 case Opt_i_version:
1307 set_opt(sbi->s_mount_opt, I_VERSION);
1308 sb->s_flags |= MS_I_VERSION;
1309 break;
1310 case Opt_mballoc:
1311 set_opt(sbi->s_mount_opt, MBALLOC);
1312 break;
1313 case Opt_nomballoc:
1314 clear_opt(sbi->s_mount_opt, MBALLOC);
1315 break;
1316 case Opt_stripe:
1317 if (match_int(&args[0], &option))
1318 return 0;
1319 if (option < 0)
1320 return 0;
1321 sbi->s_stripe = option;
1322 break;
1323 default:
1324 printk (KERN_ERR
1325 "EXT4-fs: Unrecognized mount option \"%s\" "
1326 "or missing value\n", p);
1327 return 0;
1328 }
1329 }
1330 #ifdef CONFIG_QUOTA
1331 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1332 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1333 sbi->s_qf_names[USRQUOTA])
1334 clear_opt(sbi->s_mount_opt, USRQUOTA);
1335
1336 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1337 sbi->s_qf_names[GRPQUOTA])
1338 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1339
1340 if ((sbi->s_qf_names[USRQUOTA] &&
1341 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1342 (sbi->s_qf_names[GRPQUOTA] &&
1343 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1344 printk(KERN_ERR "EXT4-fs: old and new quota "
1345 "format mixing.\n");
1346 return 0;
1347 }
1348
1349 if (!sbi->s_jquota_fmt) {
1350 printk(KERN_ERR "EXT4-fs: journalled quota format "
1351 "not specified.\n");
1352 return 0;
1353 }
1354 } else {
1355 if (sbi->s_jquota_fmt) {
1356 printk(KERN_ERR "EXT4-fs: journalled quota format "
1357 "specified with no journalling "
1358 "enabled.\n");
1359 return 0;
1360 }
1361 }
1362 #endif
1363 return 1;
1364 }
1365
1366 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1367 int read_only)
1368 {
1369 struct ext4_sb_info *sbi = EXT4_SB(sb);
1370 int res = 0;
1371
1372 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1373 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1374 "forcing read-only mode\n");
1375 res = MS_RDONLY;
1376 }
1377 if (read_only)
1378 return res;
1379 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1380 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1381 "running e2fsck is recommended\n");
1382 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1383 printk (KERN_WARNING
1384 "EXT4-fs warning: mounting fs with errors, "
1385 "running e2fsck is recommended\n");
1386 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1387 le16_to_cpu(es->s_mnt_count) >=
1388 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1389 printk (KERN_WARNING
1390 "EXT4-fs warning: maximal mount count reached, "
1391 "running e2fsck is recommended\n");
1392 else if (le32_to_cpu(es->s_checkinterval) &&
1393 (le32_to_cpu(es->s_lastcheck) +
1394 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1395 printk (KERN_WARNING
1396 "EXT4-fs warning: checktime reached, "
1397 "running e2fsck is recommended\n");
1398 #if 0
1399 /* @@@ We _will_ want to clear the valid bit if we find
1400 * inconsistencies, to force a fsck at reboot. But for
1401 * a plain journaled filesystem we can keep it set as
1402 * valid forever! :)
1403 */
1404 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1405 #endif
1406 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1407 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1408 le16_add_cpu(&es->s_mnt_count, 1);
1409 es->s_mtime = cpu_to_le32(get_seconds());
1410 ext4_update_dynamic_rev(sb);
1411 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1412
1413 ext4_commit_super(sb, es, 1);
1414 if (test_opt(sb, DEBUG))
1415 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1416 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1417 sb->s_blocksize,
1418 sbi->s_groups_count,
1419 EXT4_BLOCKS_PER_GROUP(sb),
1420 EXT4_INODES_PER_GROUP(sb),
1421 sbi->s_mount_opt);
1422
1423 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1424 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1425 char b[BDEVNAME_SIZE];
1426
1427 printk("external journal on %s\n",
1428 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1429 } else {
1430 printk("internal journal\n");
1431 }
1432 return res;
1433 }
1434
1435 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1436 struct ext4_group_desc *gdp)
1437 {
1438 __u16 crc = 0;
1439
1440 if (sbi->s_es->s_feature_ro_compat &
1441 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1442 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1443 __le32 le_group = cpu_to_le32(block_group);
1444
1445 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1446 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1447 crc = crc16(crc, (__u8 *)gdp, offset);
1448 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1449 /* for checksum of struct ext4_group_desc do the rest...*/
1450 if ((sbi->s_es->s_feature_incompat &
1451 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1452 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1453 crc = crc16(crc, (__u8 *)gdp + offset,
1454 le16_to_cpu(sbi->s_es->s_desc_size) -
1455 offset);
1456 }
1457
1458 return cpu_to_le16(crc);
1459 }
1460
1461 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1462 struct ext4_group_desc *gdp)
1463 {
1464 if ((sbi->s_es->s_feature_ro_compat &
1465 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1466 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1467 return 0;
1468
1469 return 1;
1470 }
1471
1472 /* Called at mount-time, super-block is locked */
1473 static int ext4_check_descriptors(struct super_block *sb)
1474 {
1475 struct ext4_sb_info *sbi = EXT4_SB(sb);
1476 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1477 ext4_fsblk_t last_block;
1478 ext4_fsblk_t block_bitmap;
1479 ext4_fsblk_t inode_bitmap;
1480 ext4_fsblk_t inode_table;
1481 int flexbg_flag = 0;
1482 ext4_group_t i;
1483
1484 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1485 flexbg_flag = 1;
1486
1487 ext4_debug ("Checking group descriptors");
1488
1489 for (i = 0; i < sbi->s_groups_count; i++) {
1490 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1491
1492 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1493 last_block = ext4_blocks_count(sbi->s_es) - 1;
1494 else
1495 last_block = first_block +
1496 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1497
1498 block_bitmap = ext4_block_bitmap(sb, gdp);
1499 if (block_bitmap < first_block || block_bitmap > last_block)
1500 {
1501 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1502 "Block bitmap for group %lu not in group "
1503 "(block %llu)!", i, block_bitmap);
1504 return 0;
1505 }
1506 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1507 if (inode_bitmap < first_block || inode_bitmap > last_block)
1508 {
1509 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1510 "Inode bitmap for group %lu not in group "
1511 "(block %llu)!", i, inode_bitmap);
1512 return 0;
1513 }
1514 inode_table = ext4_inode_table(sb, gdp);
1515 if (inode_table < first_block ||
1516 inode_table + sbi->s_itb_per_group - 1 > last_block)
1517 {
1518 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1519 "Inode table for group %lu not in group "
1520 "(block %llu)!", i, inode_table);
1521 return 0;
1522 }
1523 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1524 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1525 "Checksum for group %lu failed (%u!=%u)\n",
1526 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1527 gdp)), le16_to_cpu(gdp->bg_checksum));
1528 return 0;
1529 }
1530 if (!flexbg_flag)
1531 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1532 }
1533
1534 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1535 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1536 return 1;
1537 }
1538
1539 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1540 * the superblock) which were deleted from all directories, but held open by
1541 * a process at the time of a crash. We walk the list and try to delete these
1542 * inodes at recovery time (only with a read-write filesystem).
1543 *
1544 * In order to keep the orphan inode chain consistent during traversal (in
1545 * case of crash during recovery), we link each inode into the superblock
1546 * orphan list_head and handle it the same way as an inode deletion during
1547 * normal operation (which journals the operations for us).
1548 *
1549 * We only do an iget() and an iput() on each inode, which is very safe if we
1550 * accidentally point at an in-use or already deleted inode. The worst that
1551 * can happen in this case is that we get a "bit already cleared" message from
1552 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1553 * e2fsck was run on this filesystem, and it must have already done the orphan
1554 * inode cleanup for us, so we can safely abort without any further action.
1555 */
1556 static void ext4_orphan_cleanup (struct super_block * sb,
1557 struct ext4_super_block * es)
1558 {
1559 unsigned int s_flags = sb->s_flags;
1560 int nr_orphans = 0, nr_truncates = 0;
1561 #ifdef CONFIG_QUOTA
1562 int i;
1563 #endif
1564 if (!es->s_last_orphan) {
1565 jbd_debug(4, "no orphan inodes to clean up\n");
1566 return;
1567 }
1568
1569 if (bdev_read_only(sb->s_bdev)) {
1570 printk(KERN_ERR "EXT4-fs: write access "
1571 "unavailable, skipping orphan cleanup.\n");
1572 return;
1573 }
1574
1575 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1576 if (es->s_last_orphan)
1577 jbd_debug(1, "Errors on filesystem, "
1578 "clearing orphan list.\n");
1579 es->s_last_orphan = 0;
1580 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1581 return;
1582 }
1583
1584 if (s_flags & MS_RDONLY) {
1585 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1586 sb->s_id);
1587 sb->s_flags &= ~MS_RDONLY;
1588 }
1589 #ifdef CONFIG_QUOTA
1590 /* Needed for iput() to work correctly and not trash data */
1591 sb->s_flags |= MS_ACTIVE;
1592 /* Turn on quotas so that they are updated correctly */
1593 for (i = 0; i < MAXQUOTAS; i++) {
1594 if (EXT4_SB(sb)->s_qf_names[i]) {
1595 int ret = ext4_quota_on_mount(sb, i);
1596 if (ret < 0)
1597 printk(KERN_ERR
1598 "EXT4-fs: Cannot turn on journalled "
1599 "quota: error %d\n", ret);
1600 }
1601 }
1602 #endif
1603
1604 while (es->s_last_orphan) {
1605 struct inode *inode;
1606
1607 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1608 if (IS_ERR(inode)) {
1609 es->s_last_orphan = 0;
1610 break;
1611 }
1612
1613 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1614 DQUOT_INIT(inode);
1615 if (inode->i_nlink) {
1616 printk(KERN_DEBUG
1617 "%s: truncating inode %lu to %Ld bytes\n",
1618 __func__, inode->i_ino, inode->i_size);
1619 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1620 inode->i_ino, inode->i_size);
1621 ext4_truncate(inode);
1622 nr_truncates++;
1623 } else {
1624 printk(KERN_DEBUG
1625 "%s: deleting unreferenced inode %lu\n",
1626 __func__, inode->i_ino);
1627 jbd_debug(2, "deleting unreferenced inode %lu\n",
1628 inode->i_ino);
1629 nr_orphans++;
1630 }
1631 iput(inode); /* The delete magic happens here! */
1632 }
1633
1634 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1635
1636 if (nr_orphans)
1637 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1638 sb->s_id, PLURAL(nr_orphans));
1639 if (nr_truncates)
1640 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1641 sb->s_id, PLURAL(nr_truncates));
1642 #ifdef CONFIG_QUOTA
1643 /* Turn quotas off */
1644 for (i = 0; i < MAXQUOTAS; i++) {
1645 if (sb_dqopt(sb)->files[i])
1646 vfs_quota_off(sb, i, 0);
1647 }
1648 #endif
1649 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1650 }
1651 /*
1652 * Maximal extent format file size.
1653 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1654 * extent format containers, within a sector_t, and within i_blocks
1655 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1656 * so that won't be a limiting factor.
1657 *
1658 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1659 */
1660 static loff_t ext4_max_size(int blkbits)
1661 {
1662 loff_t res;
1663 loff_t upper_limit = MAX_LFS_FILESIZE;
1664
1665 /* small i_blocks in vfs inode? */
1666 if (sizeof(blkcnt_t) < sizeof(u64)) {
1667 /*
1668 * CONFIG_LSF is not enabled implies the inode
1669 * i_block represent total blocks in 512 bytes
1670 * 32 == size of vfs inode i_blocks * 8
1671 */
1672 upper_limit = (1LL << 32) - 1;
1673
1674 /* total blocks in file system block size */
1675 upper_limit >>= (blkbits - 9);
1676 upper_limit <<= blkbits;
1677 }
1678
1679 /* 32-bit extent-start container, ee_block */
1680 res = 1LL << 32;
1681 res <<= blkbits;
1682 res -= 1;
1683
1684 /* Sanity check against vm- & vfs- imposed limits */
1685 if (res > upper_limit)
1686 res = upper_limit;
1687
1688 return res;
1689 }
1690
1691 /*
1692 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1693 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1694 * We need to be 1 filesystem block less than the 2^48 sector limit.
1695 */
1696 static loff_t ext4_max_bitmap_size(int bits)
1697 {
1698 loff_t res = EXT4_NDIR_BLOCKS;
1699 int meta_blocks;
1700 loff_t upper_limit;
1701 /* This is calculated to be the largest file size for a
1702 * dense, bitmapped file such that the total number of
1703 * sectors in the file, including data and all indirect blocks,
1704 * does not exceed 2^48 -1
1705 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1706 * total number of 512 bytes blocks of the file
1707 */
1708
1709 if (sizeof(blkcnt_t) < sizeof(u64)) {
1710 /*
1711 * CONFIG_LSF is not enabled implies the inode
1712 * i_block represent total blocks in 512 bytes
1713 * 32 == size of vfs inode i_blocks * 8
1714 */
1715 upper_limit = (1LL << 32) - 1;
1716
1717 /* total blocks in file system block size */
1718 upper_limit >>= (bits - 9);
1719
1720 } else {
1721 /*
1722 * We use 48 bit ext4_inode i_blocks
1723 * With EXT4_HUGE_FILE_FL set the i_blocks
1724 * represent total number of blocks in
1725 * file system block size
1726 */
1727 upper_limit = (1LL << 48) - 1;
1728
1729 }
1730
1731 /* indirect blocks */
1732 meta_blocks = 1;
1733 /* double indirect blocks */
1734 meta_blocks += 1 + (1LL << (bits-2));
1735 /* tripple indirect blocks */
1736 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1737
1738 upper_limit -= meta_blocks;
1739 upper_limit <<= bits;
1740
1741 res += 1LL << (bits-2);
1742 res += 1LL << (2*(bits-2));
1743 res += 1LL << (3*(bits-2));
1744 res <<= bits;
1745 if (res > upper_limit)
1746 res = upper_limit;
1747
1748 if (res > MAX_LFS_FILESIZE)
1749 res = MAX_LFS_FILESIZE;
1750
1751 return res;
1752 }
1753
1754 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1755 ext4_fsblk_t logical_sb_block, int nr)
1756 {
1757 struct ext4_sb_info *sbi = EXT4_SB(sb);
1758 ext4_group_t bg, first_meta_bg;
1759 int has_super = 0;
1760
1761 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1762
1763 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1764 nr < first_meta_bg)
1765 return logical_sb_block + nr + 1;
1766 bg = sbi->s_desc_per_block * nr;
1767 if (ext4_bg_has_super(sb, bg))
1768 has_super = 1;
1769 return (has_super + ext4_group_first_block_no(sb, bg));
1770 }
1771
1772 /**
1773 * ext4_get_stripe_size: Get the stripe size.
1774 * @sbi: In memory super block info
1775 *
1776 * If we have specified it via mount option, then
1777 * use the mount option value. If the value specified at mount time is
1778 * greater than the blocks per group use the super block value.
1779 * If the super block value is greater than blocks per group return 0.
1780 * Allocator needs it be less than blocks per group.
1781 *
1782 */
1783 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1784 {
1785 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1786 unsigned long stripe_width =
1787 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1788
1789 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1790 return sbi->s_stripe;
1791
1792 if (stripe_width <= sbi->s_blocks_per_group)
1793 return stripe_width;
1794
1795 if (stride <= sbi->s_blocks_per_group)
1796 return stride;
1797
1798 return 0;
1799 }
1800
1801 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1802 __releases(kernel_sem)
1803 __acquires(kernel_sem)
1804
1805 {
1806 struct buffer_head * bh;
1807 struct ext4_super_block *es = NULL;
1808 struct ext4_sb_info *sbi;
1809 ext4_fsblk_t block;
1810 ext4_fsblk_t sb_block = get_sb_block(&data);
1811 ext4_fsblk_t logical_sb_block;
1812 unsigned long offset = 0;
1813 unsigned int journal_inum = 0;
1814 unsigned long journal_devnum = 0;
1815 unsigned long def_mount_opts;
1816 struct inode *root;
1817 int ret = -EINVAL;
1818 int blocksize;
1819 int db_count;
1820 int i;
1821 int needs_recovery;
1822 __le32 features;
1823 __u64 blocks_count;
1824 int err;
1825
1826 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1827 if (!sbi)
1828 return -ENOMEM;
1829 sb->s_fs_info = sbi;
1830 sbi->s_mount_opt = 0;
1831 sbi->s_resuid = EXT4_DEF_RESUID;
1832 sbi->s_resgid = EXT4_DEF_RESGID;
1833 sbi->s_sb_block = sb_block;
1834
1835 unlock_kernel();
1836
1837 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1838 if (!blocksize) {
1839 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1840 goto out_fail;
1841 }
1842
1843 if (!sb_set_blocksize(sb, blocksize)) {
1844 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1845 goto out_fail;
1846 }
1847
1848 /*
1849 * The ext4 superblock will not be buffer aligned for other than 1kB
1850 * block sizes. We need to calculate the offset from buffer start.
1851 */
1852 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1853 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1854 offset = do_div(logical_sb_block, blocksize);
1855 } else {
1856 logical_sb_block = sb_block;
1857 }
1858
1859 if (!(bh = sb_bread(sb, logical_sb_block))) {
1860 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1861 goto out_fail;
1862 }
1863 /*
1864 * Note: s_es must be initialized as soon as possible because
1865 * some ext4 macro-instructions depend on its value
1866 */
1867 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1868 sbi->s_es = es;
1869 sb->s_magic = le16_to_cpu(es->s_magic);
1870 if (sb->s_magic != EXT4_SUPER_MAGIC)
1871 goto cantfind_ext4;
1872
1873 /* Set defaults before we parse the mount options */
1874 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1875 if (def_mount_opts & EXT4_DEFM_DEBUG)
1876 set_opt(sbi->s_mount_opt, DEBUG);
1877 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1878 set_opt(sbi->s_mount_opt, GRPID);
1879 if (def_mount_opts & EXT4_DEFM_UID16)
1880 set_opt(sbi->s_mount_opt, NO_UID32);
1881 #ifdef CONFIG_EXT4DEV_FS_XATTR
1882 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1883 set_opt(sbi->s_mount_opt, XATTR_USER);
1884 #endif
1885 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1886 if (def_mount_opts & EXT4_DEFM_ACL)
1887 set_opt(sbi->s_mount_opt, POSIX_ACL);
1888 #endif
1889 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1890 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1891 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1892 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1893 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1894 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1895
1896 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1897 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1898 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
1899 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1900 else
1901 set_opt(sbi->s_mount_opt, ERRORS_RO);
1902
1903 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1904 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1905
1906 set_opt(sbi->s_mount_opt, RESERVATION);
1907
1908 /*
1909 * turn on extents feature by default in ext4 filesystem
1910 * User -o noextents to turn it off
1911 */
1912 set_opt(sbi->s_mount_opt, EXTENTS);
1913 /*
1914 * turn on mballoc feature by default in ext4 filesystem
1915 * User -o nomballoc to turn it off
1916 */
1917 set_opt(sbi->s_mount_opt, MBALLOC);
1918
1919 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1920 NULL, 0))
1921 goto failed_mount;
1922
1923 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1924 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1925
1926 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1927 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1928 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1929 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1930 printk(KERN_WARNING
1931 "EXT4-fs warning: feature flags set on rev 0 fs, "
1932 "running e2fsck is recommended\n");
1933
1934 /*
1935 * Since ext4 is still considered development code, we require
1936 * that the TEST_FILESYS flag in s->flags be set.
1937 */
1938 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
1939 printk(KERN_WARNING "EXT4-fs: %s: not marked "
1940 "OK to use with test code.\n", sb->s_id);
1941 goto failed_mount;
1942 }
1943
1944 /*
1945 * Check feature flags regardless of the revision level, since we
1946 * previously didn't change the revision level when setting the flags,
1947 * so there is a chance incompat flags are set on a rev 0 filesystem.
1948 */
1949 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1950 if (features) {
1951 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1952 "unsupported optional features (%x).\n",
1953 sb->s_id, le32_to_cpu(features));
1954 goto failed_mount;
1955 }
1956 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1957 if (!(sb->s_flags & MS_RDONLY) && features) {
1958 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1959 "unsupported optional features (%x).\n",
1960 sb->s_id, le32_to_cpu(features));
1961 goto failed_mount;
1962 }
1963 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1964 /*
1965 * Large file size enabled file system can only be
1966 * mount if kernel is build with CONFIG_LSF
1967 */
1968 if (sizeof(root->i_blocks) < sizeof(u64) &&
1969 !(sb->s_flags & MS_RDONLY)) {
1970 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1971 "files cannot be mounted read-write "
1972 "without CONFIG_LSF.\n", sb->s_id);
1973 goto failed_mount;
1974 }
1975 }
1976 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1977
1978 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1979 blocksize > EXT4_MAX_BLOCK_SIZE) {
1980 printk(KERN_ERR
1981 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1982 blocksize, sb->s_id);
1983 goto failed_mount;
1984 }
1985
1986 if (sb->s_blocksize != blocksize) {
1987
1988 /* Validate the filesystem blocksize */
1989 if (!sb_set_blocksize(sb, blocksize)) {
1990 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
1991 blocksize);
1992 goto failed_mount;
1993 }
1994
1995 brelse (bh);
1996 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1997 offset = do_div(logical_sb_block, blocksize);
1998 bh = sb_bread(sb, logical_sb_block);
1999 if (!bh) {
2000 printk(KERN_ERR
2001 "EXT4-fs: Can't read superblock on 2nd try.\n");
2002 goto failed_mount;
2003 }
2004 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2005 sbi->s_es = es;
2006 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2007 printk (KERN_ERR
2008 "EXT4-fs: Magic mismatch, very weird !\n");
2009 goto failed_mount;
2010 }
2011 }
2012
2013 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
2014 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
2015
2016 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2017 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2018 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2019 } else {
2020 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2021 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2022 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2023 (!is_power_of_2(sbi->s_inode_size)) ||
2024 (sbi->s_inode_size > blocksize)) {
2025 printk (KERN_ERR
2026 "EXT4-fs: unsupported inode size: %d\n",
2027 sbi->s_inode_size);
2028 goto failed_mount;
2029 }
2030 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2031 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2032 }
2033 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2034 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2035 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2036 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2037 !is_power_of_2(sbi->s_desc_size)) {
2038 printk(KERN_ERR
2039 "EXT4-fs: unsupported descriptor size %lu\n",
2040 sbi->s_desc_size);
2041 goto failed_mount;
2042 }
2043 } else
2044 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2045 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2046 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2047 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2048 goto cantfind_ext4;
2049 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2050 if (sbi->s_inodes_per_block == 0)
2051 goto cantfind_ext4;
2052 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2053 sbi->s_inodes_per_block;
2054 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2055 sbi->s_sbh = bh;
2056 sbi->s_mount_state = le16_to_cpu(es->s_state);
2057 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2058 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2059 for (i=0; i < 4; i++)
2060 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2061 sbi->s_def_hash_version = es->s_def_hash_version;
2062
2063 if (sbi->s_blocks_per_group > blocksize * 8) {
2064 printk (KERN_ERR
2065 "EXT4-fs: #blocks per group too big: %lu\n",
2066 sbi->s_blocks_per_group);
2067 goto failed_mount;
2068 }
2069 if (sbi->s_inodes_per_group > blocksize * 8) {
2070 printk (KERN_ERR
2071 "EXT4-fs: #inodes per group too big: %lu\n",
2072 sbi->s_inodes_per_group);
2073 goto failed_mount;
2074 }
2075
2076 if (ext4_blocks_count(es) >
2077 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2078 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2079 " too large to mount safely\n", sb->s_id);
2080 if (sizeof(sector_t) < 8)
2081 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2082 "enabled\n");
2083 goto failed_mount;
2084 }
2085
2086 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2087 goto cantfind_ext4;
2088
2089 /* ensure blocks_count calculation below doesn't sign-extend */
2090 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2091 le32_to_cpu(es->s_first_data_block) + 1) {
2092 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2093 "first data block %u, blocks per group %lu\n",
2094 ext4_blocks_count(es),
2095 le32_to_cpu(es->s_first_data_block),
2096 EXT4_BLOCKS_PER_GROUP(sb));
2097 goto failed_mount;
2098 }
2099 blocks_count = (ext4_blocks_count(es) -
2100 le32_to_cpu(es->s_first_data_block) +
2101 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2102 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2103 sbi->s_groups_count = blocks_count;
2104 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2105 EXT4_DESC_PER_BLOCK(sb);
2106 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2107 GFP_KERNEL);
2108 if (sbi->s_group_desc == NULL) {
2109 printk (KERN_ERR "EXT4-fs: not enough memory\n");
2110 goto failed_mount;
2111 }
2112
2113 bgl_lock_init(&sbi->s_blockgroup_lock);
2114
2115 for (i = 0; i < db_count; i++) {
2116 block = descriptor_loc(sb, logical_sb_block, i);
2117 sbi->s_group_desc[i] = sb_bread(sb, block);
2118 if (!sbi->s_group_desc[i]) {
2119 printk (KERN_ERR "EXT4-fs: "
2120 "can't read group descriptor %d\n", i);
2121 db_count = i;
2122 goto failed_mount2;
2123 }
2124 }
2125 if (!ext4_check_descriptors (sb)) {
2126 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2127 goto failed_mount2;
2128 }
2129 sbi->s_gdb_count = db_count;
2130 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2131 spin_lock_init(&sbi->s_next_gen_lock);
2132
2133 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2134 ext4_count_free_blocks(sb));
2135 if (!err) {
2136 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2137 ext4_count_free_inodes(sb));
2138 }
2139 if (!err) {
2140 err = percpu_counter_init(&sbi->s_dirs_counter,
2141 ext4_count_dirs(sb));
2142 }
2143 if (err) {
2144 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2145 goto failed_mount3;
2146 }
2147
2148 /* per fileystem reservation list head & lock */
2149 spin_lock_init(&sbi->s_rsv_window_lock);
2150 sbi->s_rsv_window_root = RB_ROOT;
2151 /* Add a single, static dummy reservation to the start of the
2152 * reservation window list --- it gives us a placeholder for
2153 * append-at-start-of-list which makes the allocation logic
2154 * _much_ simpler. */
2155 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2156 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2157 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2158 sbi->s_rsv_window_head.rsv_goal_size = 0;
2159 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
2160
2161 sbi->s_stripe = ext4_get_stripe_size(sbi);
2162
2163 /*
2164 * set up enough so that it can read an inode
2165 */
2166 sb->s_op = &ext4_sops;
2167 sb->s_export_op = &ext4_export_ops;
2168 sb->s_xattr = ext4_xattr_handlers;
2169 #ifdef CONFIG_QUOTA
2170 sb->s_qcop = &ext4_qctl_operations;
2171 sb->dq_op = &ext4_quota_operations;
2172 #endif
2173 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2174
2175 sb->s_root = NULL;
2176
2177 needs_recovery = (es->s_last_orphan != 0 ||
2178 EXT4_HAS_INCOMPAT_FEATURE(sb,
2179 EXT4_FEATURE_INCOMPAT_RECOVER));
2180
2181 /*
2182 * The first inode we look at is the journal inode. Don't try
2183 * root first: it may be modified in the journal!
2184 */
2185 if (!test_opt(sb, NOLOAD) &&
2186 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2187 if (ext4_load_journal(sb, es, journal_devnum))
2188 goto failed_mount3;
2189 } else if (journal_inum) {
2190 if (ext4_create_journal(sb, es, journal_inum))
2191 goto failed_mount3;
2192 } else {
2193 if (!silent)
2194 printk (KERN_ERR
2195 "ext4: No journal on filesystem on %s\n",
2196 sb->s_id);
2197 goto failed_mount3;
2198 }
2199
2200 if (ext4_blocks_count(es) > 0xffffffffULL &&
2201 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2202 JBD2_FEATURE_INCOMPAT_64BIT)) {
2203 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2204 goto failed_mount4;
2205 }
2206
2207 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2208 jbd2_journal_set_features(sbi->s_journal,
2209 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2210 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2211 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2212 jbd2_journal_set_features(sbi->s_journal,
2213 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2214 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2215 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2216 } else {
2217 jbd2_journal_clear_features(sbi->s_journal,
2218 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2219 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2220 }
2221
2222 /* We have now updated the journal if required, so we can
2223 * validate the data journaling mode. */
2224 switch (test_opt(sb, DATA_FLAGS)) {
2225 case 0:
2226 /* No mode set, assume a default based on the journal
2227 * capabilities: ORDERED_DATA if the journal can
2228 * cope, else JOURNAL_DATA
2229 */
2230 if (jbd2_journal_check_available_features
2231 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2232 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2233 else
2234 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2235 break;
2236
2237 case EXT4_MOUNT_ORDERED_DATA:
2238 case EXT4_MOUNT_WRITEBACK_DATA:
2239 if (!jbd2_journal_check_available_features
2240 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2241 printk(KERN_ERR "EXT4-fs: Journal does not support "
2242 "requested data journaling mode\n");
2243 goto failed_mount4;
2244 }
2245 default:
2246 break;
2247 }
2248
2249 if (test_opt(sb, NOBH)) {
2250 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2251 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2252 "its supported only with writeback mode\n");
2253 clear_opt(sbi->s_mount_opt, NOBH);
2254 }
2255 }
2256 /*
2257 * The jbd2_journal_load will have done any necessary log recovery,
2258 * so we can safely mount the rest of the filesystem now.
2259 */
2260
2261 root = ext4_iget(sb, EXT4_ROOT_INO);
2262 if (IS_ERR(root)) {
2263 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2264 ret = PTR_ERR(root);
2265 goto failed_mount4;
2266 }
2267 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2268 iput(root);
2269 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2270 goto failed_mount4;
2271 }
2272 sb->s_root = d_alloc_root(root);
2273 if (!sb->s_root) {
2274 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2275 iput(root);
2276 ret = -ENOMEM;
2277 goto failed_mount4;
2278 }
2279
2280 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2281
2282 /* determine the minimum size of new large inodes, if present */
2283 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2284 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2285 EXT4_GOOD_OLD_INODE_SIZE;
2286 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2287 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2288 if (sbi->s_want_extra_isize <
2289 le16_to_cpu(es->s_want_extra_isize))
2290 sbi->s_want_extra_isize =
2291 le16_to_cpu(es->s_want_extra_isize);
2292 if (sbi->s_want_extra_isize <
2293 le16_to_cpu(es->s_min_extra_isize))
2294 sbi->s_want_extra_isize =
2295 le16_to_cpu(es->s_min_extra_isize);
2296 }
2297 }
2298 /* Check if enough inode space is available */
2299 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2300 sbi->s_inode_size) {
2301 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2302 EXT4_GOOD_OLD_INODE_SIZE;
2303 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2304 "available.\n");
2305 }
2306
2307 /*
2308 * akpm: core read_super() calls in here with the superblock locked.
2309 * That deadlocks, because orphan cleanup needs to lock the superblock
2310 * in numerous places. Here we just pop the lock - it's relatively
2311 * harmless, because we are now ready to accept write_super() requests,
2312 * and aviro says that's the only reason for hanging onto the
2313 * superblock lock.
2314 */
2315 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2316 ext4_orphan_cleanup(sb, es);
2317 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2318 if (needs_recovery)
2319 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2320 ext4_mark_recovery_complete(sb, es);
2321 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2322 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2323 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2324 "writeback");
2325
2326 ext4_ext_init(sb);
2327 ext4_mb_init(sb, needs_recovery);
2328
2329 lock_kernel();
2330 return 0;
2331
2332 cantfind_ext4:
2333 if (!silent)
2334 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2335 sb->s_id);
2336 goto failed_mount;
2337
2338 failed_mount4:
2339 jbd2_journal_destroy(sbi->s_journal);
2340 failed_mount3:
2341 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2342 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2343 percpu_counter_destroy(&sbi->s_dirs_counter);
2344 failed_mount2:
2345 for (i = 0; i < db_count; i++)
2346 brelse(sbi->s_group_desc[i]);
2347 kfree(sbi->s_group_desc);
2348 failed_mount:
2349 #ifdef CONFIG_QUOTA
2350 for (i = 0; i < MAXQUOTAS; i++)
2351 kfree(sbi->s_qf_names[i]);
2352 #endif
2353 ext4_blkdev_remove(sbi);
2354 brelse(bh);
2355 out_fail:
2356 sb->s_fs_info = NULL;
2357 kfree(sbi);
2358 lock_kernel();
2359 return ret;
2360 }
2361
2362 /*
2363 * Setup any per-fs journal parameters now. We'll do this both on
2364 * initial mount, once the journal has been initialised but before we've
2365 * done any recovery; and again on any subsequent remount.
2366 */
2367 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2368 {
2369 struct ext4_sb_info *sbi = EXT4_SB(sb);
2370
2371 if (sbi->s_commit_interval)
2372 journal->j_commit_interval = sbi->s_commit_interval;
2373 /* We could also set up an ext4-specific default for the commit
2374 * interval here, but for now we'll just fall back to the jbd
2375 * default. */
2376
2377 spin_lock(&journal->j_state_lock);
2378 if (test_opt(sb, BARRIER))
2379 journal->j_flags |= JBD2_BARRIER;
2380 else
2381 journal->j_flags &= ~JBD2_BARRIER;
2382 spin_unlock(&journal->j_state_lock);
2383 }
2384
2385 static journal_t *ext4_get_journal(struct super_block *sb,
2386 unsigned int journal_inum)
2387 {
2388 struct inode *journal_inode;
2389 journal_t *journal;
2390
2391 /* First, test for the existence of a valid inode on disk. Bad
2392 * things happen if we iget() an unused inode, as the subsequent
2393 * iput() will try to delete it. */
2394
2395 journal_inode = ext4_iget(sb, journal_inum);
2396 if (IS_ERR(journal_inode)) {
2397 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2398 return NULL;
2399 }
2400 if (!journal_inode->i_nlink) {
2401 make_bad_inode(journal_inode);
2402 iput(journal_inode);
2403 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2404 return NULL;
2405 }
2406
2407 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2408 journal_inode, journal_inode->i_size);
2409 if (!S_ISREG(journal_inode->i_mode)) {
2410 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2411 iput(journal_inode);
2412 return NULL;
2413 }
2414
2415 journal = jbd2_journal_init_inode(journal_inode);
2416 if (!journal) {
2417 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2418 iput(journal_inode);
2419 return NULL;
2420 }
2421 journal->j_private = sb;
2422 ext4_init_journal_params(sb, journal);
2423 return journal;
2424 }
2425
2426 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2427 dev_t j_dev)
2428 {
2429 struct buffer_head * bh;
2430 journal_t *journal;
2431 ext4_fsblk_t start;
2432 ext4_fsblk_t len;
2433 int hblock, blocksize;
2434 ext4_fsblk_t sb_block;
2435 unsigned long offset;
2436 struct ext4_super_block * es;
2437 struct block_device *bdev;
2438
2439 bdev = ext4_blkdev_get(j_dev);
2440 if (bdev == NULL)
2441 return NULL;
2442
2443 if (bd_claim(bdev, sb)) {
2444 printk(KERN_ERR
2445 "EXT4: failed to claim external journal device.\n");
2446 blkdev_put(bdev);
2447 return NULL;
2448 }
2449
2450 blocksize = sb->s_blocksize;
2451 hblock = bdev_hardsect_size(bdev);
2452 if (blocksize < hblock) {
2453 printk(KERN_ERR
2454 "EXT4-fs: blocksize too small for journal device.\n");
2455 goto out_bdev;
2456 }
2457
2458 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2459 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2460 set_blocksize(bdev, blocksize);
2461 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2462 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2463 "external journal\n");
2464 goto out_bdev;
2465 }
2466
2467 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2468 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2469 !(le32_to_cpu(es->s_feature_incompat) &
2470 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2471 printk(KERN_ERR "EXT4-fs: external journal has "
2472 "bad superblock\n");
2473 brelse(bh);
2474 goto out_bdev;
2475 }
2476
2477 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2478 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2479 brelse(bh);
2480 goto out_bdev;
2481 }
2482
2483 len = ext4_blocks_count(es);
2484 start = sb_block + 1;
2485 brelse(bh); /* we're done with the superblock */
2486
2487 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2488 start, len, blocksize);
2489 if (!journal) {
2490 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2491 goto out_bdev;
2492 }
2493 journal->j_private = sb;
2494 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2495 wait_on_buffer(journal->j_sb_buffer);
2496 if (!buffer_uptodate(journal->j_sb_buffer)) {
2497 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2498 goto out_journal;
2499 }
2500 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2501 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2502 "user (unsupported) - %d\n",
2503 be32_to_cpu(journal->j_superblock->s_nr_users));
2504 goto out_journal;
2505 }
2506 EXT4_SB(sb)->journal_bdev = bdev;
2507 ext4_init_journal_params(sb, journal);
2508 return journal;
2509 out_journal:
2510 jbd2_journal_destroy(journal);
2511 out_bdev:
2512 ext4_blkdev_put(bdev);
2513 return NULL;
2514 }
2515
2516 static int ext4_load_journal(struct super_block *sb,
2517 struct ext4_super_block *es,
2518 unsigned long journal_devnum)
2519 {
2520 journal_t *journal;
2521 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2522 dev_t journal_dev;
2523 int err = 0;
2524 int really_read_only;
2525
2526 if (journal_devnum &&
2527 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2528 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2529 "numbers have changed\n");
2530 journal_dev = new_decode_dev(journal_devnum);
2531 } else
2532 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2533
2534 really_read_only = bdev_read_only(sb->s_bdev);
2535
2536 /*
2537 * Are we loading a blank journal or performing recovery after a
2538 * crash? For recovery, we need to check in advance whether we
2539 * can get read-write access to the device.
2540 */
2541
2542 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2543 if (sb->s_flags & MS_RDONLY) {
2544 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2545 "required on readonly filesystem.\n");
2546 if (really_read_only) {
2547 printk(KERN_ERR "EXT4-fs: write access "
2548 "unavailable, cannot proceed.\n");
2549 return -EROFS;
2550 }
2551 printk (KERN_INFO "EXT4-fs: write access will "
2552 "be enabled during recovery.\n");
2553 }
2554 }
2555
2556 if (journal_inum && journal_dev) {
2557 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2558 "and inode journals!\n");
2559 return -EINVAL;
2560 }
2561
2562 if (journal_inum) {
2563 if (!(journal = ext4_get_journal(sb, journal_inum)))
2564 return -EINVAL;
2565 } else {
2566 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2567 return -EINVAL;
2568 }
2569
2570 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2571 err = jbd2_journal_update_format(journal);
2572 if (err) {
2573 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2574 jbd2_journal_destroy(journal);
2575 return err;
2576 }
2577 }
2578
2579 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2580 err = jbd2_journal_wipe(journal, !really_read_only);
2581 if (!err)
2582 err = jbd2_journal_load(journal);
2583
2584 if (err) {
2585 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2586 jbd2_journal_destroy(journal);
2587 return err;
2588 }
2589
2590 EXT4_SB(sb)->s_journal = journal;
2591 ext4_clear_journal_err(sb, es);
2592
2593 if (journal_devnum &&
2594 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2595 es->s_journal_dev = cpu_to_le32(journal_devnum);
2596 sb->s_dirt = 1;
2597
2598 /* Make sure we flush the recovery flag to disk. */
2599 ext4_commit_super(sb, es, 1);
2600 }
2601
2602 return 0;
2603 }
2604
2605 static int ext4_create_journal(struct super_block * sb,
2606 struct ext4_super_block * es,
2607 unsigned int journal_inum)
2608 {
2609 journal_t *journal;
2610 int err;
2611
2612 if (sb->s_flags & MS_RDONLY) {
2613 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2614 "create journal.\n");
2615 return -EROFS;
2616 }
2617
2618 journal = ext4_get_journal(sb, journal_inum);
2619 if (!journal)
2620 return -EINVAL;
2621
2622 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2623 journal_inum);
2624
2625 err = jbd2_journal_create(journal);
2626 if (err) {
2627 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2628 jbd2_journal_destroy(journal);
2629 return -EIO;
2630 }
2631
2632 EXT4_SB(sb)->s_journal = journal;
2633
2634 ext4_update_dynamic_rev(sb);
2635 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2636 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2637
2638 es->s_journal_inum = cpu_to_le32(journal_inum);
2639 sb->s_dirt = 1;
2640
2641 /* Make sure we flush the recovery flag to disk. */
2642 ext4_commit_super(sb, es, 1);
2643
2644 return 0;
2645 }
2646
2647 static void ext4_commit_super (struct super_block * sb,
2648 struct ext4_super_block * es,
2649 int sync)
2650 {
2651 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2652
2653 if (!sbh)
2654 return;
2655 es->s_wtime = cpu_to_le32(get_seconds());
2656 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2657 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2658 BUFFER_TRACE(sbh, "marking dirty");
2659 mark_buffer_dirty(sbh);
2660 if (sync)
2661 sync_dirty_buffer(sbh);
2662 }
2663
2664
2665 /*
2666 * Have we just finished recovery? If so, and if we are mounting (or
2667 * remounting) the filesystem readonly, then we will end up with a
2668 * consistent fs on disk. Record that fact.
2669 */
2670 static void ext4_mark_recovery_complete(struct super_block * sb,
2671 struct ext4_super_block * es)
2672 {
2673 journal_t *journal = EXT4_SB(sb)->s_journal;
2674
2675 jbd2_journal_lock_updates(journal);
2676 jbd2_journal_flush(journal);
2677 lock_super(sb);
2678 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2679 sb->s_flags & MS_RDONLY) {
2680 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2681 sb->s_dirt = 0;
2682 ext4_commit_super(sb, es, 1);
2683 }
2684 unlock_super(sb);
2685 jbd2_journal_unlock_updates(journal);
2686 }
2687
2688 /*
2689 * If we are mounting (or read-write remounting) a filesystem whose journal
2690 * has recorded an error from a previous lifetime, move that error to the
2691 * main filesystem now.
2692 */
2693 static void ext4_clear_journal_err(struct super_block * sb,
2694 struct ext4_super_block * es)
2695 {
2696 journal_t *journal;
2697 int j_errno;
2698 const char *errstr;
2699
2700 journal = EXT4_SB(sb)->s_journal;
2701
2702 /*
2703 * Now check for any error status which may have been recorded in the
2704 * journal by a prior ext4_error() or ext4_abort()
2705 */
2706
2707 j_errno = jbd2_journal_errno(journal);
2708 if (j_errno) {
2709 char nbuf[16];
2710
2711 errstr = ext4_decode_error(sb, j_errno, nbuf);
2712 ext4_warning(sb, __func__, "Filesystem error recorded "
2713 "from previous mount: %s", errstr);
2714 ext4_warning(sb, __func__, "Marking fs in need of "
2715 "filesystem check.");
2716
2717 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2718 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2719 ext4_commit_super (sb, es, 1);
2720
2721 jbd2_journal_clear_err(journal);
2722 }
2723 }
2724
2725 /*
2726 * Force the running and committing transactions to commit,
2727 * and wait on the commit.
2728 */
2729 int ext4_force_commit(struct super_block *sb)
2730 {
2731 journal_t *journal;
2732 int ret;
2733
2734 if (sb->s_flags & MS_RDONLY)
2735 return 0;
2736
2737 journal = EXT4_SB(sb)->s_journal;
2738 sb->s_dirt = 0;
2739 ret = ext4_journal_force_commit(journal);
2740 return ret;
2741 }
2742
2743 /*
2744 * Ext4 always journals updates to the superblock itself, so we don't
2745 * have to propagate any other updates to the superblock on disk at this
2746 * point. Just start an async writeback to get the buffers on their way
2747 * to the disk.
2748 *
2749 * This implicitly triggers the writebehind on sync().
2750 */
2751
2752 static void ext4_write_super (struct super_block * sb)
2753 {
2754 if (mutex_trylock(&sb->s_lock) != 0)
2755 BUG();
2756 sb->s_dirt = 0;
2757 }
2758
2759 static int ext4_sync_fs(struct super_block *sb, int wait)
2760 {
2761 tid_t target;
2762
2763 sb->s_dirt = 0;
2764 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2765 if (wait)
2766 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2767 }
2768 return 0;
2769 }
2770
2771 /*
2772 * LVM calls this function before a (read-only) snapshot is created. This
2773 * gives us a chance to flush the journal completely and mark the fs clean.
2774 */
2775 static void ext4_write_super_lockfs(struct super_block *sb)
2776 {
2777 sb->s_dirt = 0;
2778
2779 if (!(sb->s_flags & MS_RDONLY)) {
2780 journal_t *journal = EXT4_SB(sb)->s_journal;
2781
2782 /* Now we set up the journal barrier. */
2783 jbd2_journal_lock_updates(journal);
2784 jbd2_journal_flush(journal);
2785
2786 /* Journal blocked and flushed, clear needs_recovery flag. */
2787 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2788 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2789 }
2790 }
2791
2792 /*
2793 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2794 * flag here, even though the filesystem is not technically dirty yet.
2795 */
2796 static void ext4_unlockfs(struct super_block *sb)
2797 {
2798 if (!(sb->s_flags & MS_RDONLY)) {
2799 lock_super(sb);
2800 /* Reser the needs_recovery flag before the fs is unlocked. */
2801 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2802 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2803 unlock_super(sb);
2804 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2805 }
2806 }
2807
2808 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2809 {
2810 struct ext4_super_block * es;
2811 struct ext4_sb_info *sbi = EXT4_SB(sb);
2812 ext4_fsblk_t n_blocks_count = 0;
2813 unsigned long old_sb_flags;
2814 struct ext4_mount_options old_opts;
2815 int err;
2816 #ifdef CONFIG_QUOTA
2817 int i;
2818 #endif
2819
2820 /* Store the original options */
2821 old_sb_flags = sb->s_flags;
2822 old_opts.s_mount_opt = sbi->s_mount_opt;
2823 old_opts.s_resuid = sbi->s_resuid;
2824 old_opts.s_resgid = sbi->s_resgid;
2825 old_opts.s_commit_interval = sbi->s_commit_interval;
2826 #ifdef CONFIG_QUOTA
2827 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2828 for (i = 0; i < MAXQUOTAS; i++)
2829 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2830 #endif
2831
2832 /*
2833 * Allow the "check" option to be passed as a remount option.
2834 */
2835 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2836 err = -EINVAL;
2837 goto restore_opts;
2838 }
2839
2840 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2841 ext4_abort(sb, __func__, "Abort forced by user");
2842
2843 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2844 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2845
2846 es = sbi->s_es;
2847
2848 ext4_init_journal_params(sb, sbi->s_journal);
2849
2850 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2851 n_blocks_count > ext4_blocks_count(es)) {
2852 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2853 err = -EROFS;
2854 goto restore_opts;
2855 }
2856
2857 if (*flags & MS_RDONLY) {
2858 /*
2859 * First of all, the unconditional stuff we have to do
2860 * to disable replay of the journal when we next remount
2861 */
2862 sb->s_flags |= MS_RDONLY;
2863
2864 /*
2865 * OK, test if we are remounting a valid rw partition
2866 * readonly, and if so set the rdonly flag and then
2867 * mark the partition as valid again.
2868 */
2869 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2870 (sbi->s_mount_state & EXT4_VALID_FS))
2871 es->s_state = cpu_to_le16(sbi->s_mount_state);
2872
2873 /*
2874 * We have to unlock super so that we can wait for
2875 * transactions.
2876 */
2877 unlock_super(sb);
2878 ext4_mark_recovery_complete(sb, es);
2879 lock_super(sb);
2880 } else {
2881 __le32 ret;
2882 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2883 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2884 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2885 "remount RDWR because of unsupported "
2886 "optional features (%x).\n",
2887 sb->s_id, le32_to_cpu(ret));
2888 err = -EROFS;
2889 goto restore_opts;
2890 }
2891
2892 /*
2893 * If we have an unprocessed orphan list hanging
2894 * around from a previously readonly bdev mount,
2895 * require a full umount/remount for now.
2896 */
2897 if (es->s_last_orphan) {
2898 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2899 "remount RDWR because of unprocessed "
2900 "orphan inode list. Please "
2901 "umount/remount instead.\n",
2902 sb->s_id);
2903 err = -EINVAL;
2904 goto restore_opts;
2905 }
2906
2907 /*
2908 * Mounting a RDONLY partition read-write, so reread
2909 * and store the current valid flag. (It may have
2910 * been changed by e2fsck since we originally mounted
2911 * the partition.)
2912 */
2913 ext4_clear_journal_err(sb, es);
2914 sbi->s_mount_state = le16_to_cpu(es->s_state);
2915 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2916 goto restore_opts;
2917 if (!ext4_setup_super (sb, es, 0))
2918 sb->s_flags &= ~MS_RDONLY;
2919 }
2920 }
2921 #ifdef CONFIG_QUOTA
2922 /* Release old quota file names */
2923 for (i = 0; i < MAXQUOTAS; i++)
2924 if (old_opts.s_qf_names[i] &&
2925 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2926 kfree(old_opts.s_qf_names[i]);
2927 #endif
2928 return 0;
2929 restore_opts:
2930 sb->s_flags = old_sb_flags;
2931 sbi->s_mount_opt = old_opts.s_mount_opt;
2932 sbi->s_resuid = old_opts.s_resuid;
2933 sbi->s_resgid = old_opts.s_resgid;
2934 sbi->s_commit_interval = old_opts.s_commit_interval;
2935 #ifdef CONFIG_QUOTA
2936 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2937 for (i = 0; i < MAXQUOTAS; i++) {
2938 if (sbi->s_qf_names[i] &&
2939 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2940 kfree(sbi->s_qf_names[i]);
2941 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2942 }
2943 #endif
2944 return err;
2945 }
2946
2947 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2948 {
2949 struct super_block *sb = dentry->d_sb;
2950 struct ext4_sb_info *sbi = EXT4_SB(sb);
2951 struct ext4_super_block *es = sbi->s_es;
2952 u64 fsid;
2953
2954 if (test_opt(sb, MINIX_DF)) {
2955 sbi->s_overhead_last = 0;
2956 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
2957 ext4_group_t ngroups = sbi->s_groups_count, i;
2958 ext4_fsblk_t overhead = 0;
2959 smp_rmb();
2960
2961 /*
2962 * Compute the overhead (FS structures). This is constant
2963 * for a given filesystem unless the number of block groups
2964 * changes so we cache the previous value until it does.
2965 */
2966
2967 /*
2968 * All of the blocks before first_data_block are
2969 * overhead
2970 */
2971 overhead = le32_to_cpu(es->s_first_data_block);
2972
2973 /*
2974 * Add the overhead attributed to the superblock and
2975 * block group descriptors. If the sparse superblocks
2976 * feature is turned on, then not all groups have this.
2977 */
2978 for (i = 0; i < ngroups; i++) {
2979 overhead += ext4_bg_has_super(sb, i) +
2980 ext4_bg_num_gdb(sb, i);
2981 cond_resched();
2982 }
2983
2984 /*
2985 * Every block group has an inode bitmap, a block
2986 * bitmap, and an inode table.
2987 */
2988 overhead += ngroups * (2 + sbi->s_itb_per_group);
2989 sbi->s_overhead_last = overhead;
2990 smp_wmb();
2991 sbi->s_blocks_last = ext4_blocks_count(es);
2992 }
2993
2994 buf->f_type = EXT4_SUPER_MAGIC;
2995 buf->f_bsize = sb->s_blocksize;
2996 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
2997 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2998 ext4_free_blocks_count_set(es, buf->f_bfree);
2999 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3000 if (buf->f_bfree < ext4_r_blocks_count(es))
3001 buf->f_bavail = 0;
3002 buf->f_files = le32_to_cpu(es->s_inodes_count);
3003 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3004 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3005 buf->f_namelen = EXT4_NAME_LEN;
3006 fsid = le64_to_cpup((void *)es->s_uuid) ^
3007 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3008 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3009 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3010 return 0;
3011 }
3012
3013 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3014 * is locked for write. Otherwise the are possible deadlocks:
3015 * Process 1 Process 2
3016 * ext4_create() quota_sync()
3017 * jbd2_journal_start() write_dquot()
3018 * DQUOT_INIT() down(dqio_mutex)
3019 * down(dqio_mutex) jbd2_journal_start()
3020 *
3021 */
3022
3023 #ifdef CONFIG_QUOTA
3024
3025 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3026 {
3027 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3028 }
3029
3030 static int ext4_dquot_initialize(struct inode *inode, int type)
3031 {
3032 handle_t *handle;
3033 int ret, err;
3034
3035 /* We may create quota structure so we need to reserve enough blocks */
3036 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3037 if (IS_ERR(handle))
3038 return PTR_ERR(handle);
3039 ret = dquot_initialize(inode, type);
3040 err = ext4_journal_stop(handle);
3041 if (!ret)
3042 ret = err;
3043 return ret;
3044 }
3045
3046 static int ext4_dquot_drop(struct inode *inode)
3047 {
3048 handle_t *handle;
3049 int ret, err;
3050
3051 /* We may delete quota structure so we need to reserve enough blocks */
3052 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3053 if (IS_ERR(handle)) {
3054 /*
3055 * We call dquot_drop() anyway to at least release references
3056 * to quota structures so that umount does not hang.
3057 */
3058 dquot_drop(inode);
3059 return PTR_ERR(handle);
3060 }
3061 ret = dquot_drop(inode);
3062 err = ext4_journal_stop(handle);
3063 if (!ret)
3064 ret = err;
3065 return ret;
3066 }
3067
3068 static int ext4_write_dquot(struct dquot *dquot)
3069 {
3070 int ret, err;
3071 handle_t *handle;
3072 struct inode *inode;
3073
3074 inode = dquot_to_inode(dquot);
3075 handle = ext4_journal_start(inode,
3076 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3077 if (IS_ERR(handle))
3078 return PTR_ERR(handle);
3079 ret = dquot_commit(dquot);
3080 err = ext4_journal_stop(handle);
3081 if (!ret)
3082 ret = err;
3083 return ret;
3084 }
3085
3086 static int ext4_acquire_dquot(struct dquot *dquot)
3087 {
3088 int ret, err;
3089 handle_t *handle;
3090
3091 handle = ext4_journal_start(dquot_to_inode(dquot),
3092 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3093 if (IS_ERR(handle))
3094 return PTR_ERR(handle);
3095 ret = dquot_acquire(dquot);
3096 err = ext4_journal_stop(handle);
3097 if (!ret)
3098 ret = err;
3099 return ret;
3100 }
3101
3102 static int ext4_release_dquot(struct dquot *dquot)
3103 {
3104 int ret, err;
3105 handle_t *handle;
3106
3107 handle = ext4_journal_start(dquot_to_inode(dquot),
3108 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3109 if (IS_ERR(handle)) {
3110 /* Release dquot anyway to avoid endless cycle in dqput() */
3111 dquot_release(dquot);
3112 return PTR_ERR(handle);
3113 }
3114 ret = dquot_release(dquot);
3115 err = ext4_journal_stop(handle);
3116 if (!ret)
3117 ret = err;
3118 return ret;
3119 }
3120
3121 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3122 {
3123 /* Are we journalling quotas? */
3124 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3125 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3126 dquot_mark_dquot_dirty(dquot);
3127 return ext4_write_dquot(dquot);
3128 } else {
3129 return dquot_mark_dquot_dirty(dquot);
3130 }
3131 }
3132
3133 static int ext4_write_info(struct super_block *sb, int type)
3134 {
3135 int ret, err;
3136 handle_t *handle;
3137
3138 /* Data block + inode block */
3139 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3140 if (IS_ERR(handle))
3141 return PTR_ERR(handle);
3142 ret = dquot_commit_info(sb, type);
3143 err = ext4_journal_stop(handle);
3144 if (!ret)
3145 ret = err;
3146 return ret;
3147 }
3148
3149 /*
3150 * Turn on quotas during mount time - we need to find
3151 * the quota file and such...
3152 */
3153 static int ext4_quota_on_mount(struct super_block *sb, int type)
3154 {
3155 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3156 EXT4_SB(sb)->s_jquota_fmt, type);
3157 }
3158
3159 /*
3160 * Standard function to be called on quota_on
3161 */
3162 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3163 char *path, int remount)
3164 {
3165 int err;
3166 struct nameidata nd;
3167
3168 if (!test_opt(sb, QUOTA))
3169 return -EINVAL;
3170 /* Not journalling quota? */
3171 if ((!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3172 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) || remount)
3173 return vfs_quota_on(sb, type, format_id, path, remount);
3174 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3175 if (err)
3176 return err;
3177 /* Quotafile not on the same filesystem? */
3178 if (nd.path.mnt->mnt_sb != sb) {
3179 path_put(&nd.path);
3180 return -EXDEV;
3181 }
3182 /* Quotafile not of fs root? */
3183 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3184 printk(KERN_WARNING
3185 "EXT4-fs: Quota file not on filesystem root. "
3186 "Journalled quota will not work.\n");
3187 path_put(&nd.path);
3188 return vfs_quota_on(sb, type, format_id, path, remount);
3189 }
3190
3191 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3192 * acquiring the locks... As quota files are never truncated and quota code
3193 * itself serializes the operations (and noone else should touch the files)
3194 * we don't have to be afraid of races */
3195 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3196 size_t len, loff_t off)
3197 {
3198 struct inode *inode = sb_dqopt(sb)->files[type];
3199 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3200 int err = 0;
3201 int offset = off & (sb->s_blocksize - 1);
3202 int tocopy;
3203 size_t toread;
3204 struct buffer_head *bh;
3205 loff_t i_size = i_size_read(inode);
3206
3207 if (off > i_size)
3208 return 0;
3209 if (off+len > i_size)
3210 len = i_size-off;
3211 toread = len;
3212 while (toread > 0) {
3213 tocopy = sb->s_blocksize - offset < toread ?
3214 sb->s_blocksize - offset : toread;
3215 bh = ext4_bread(NULL, inode, blk, 0, &err);
3216 if (err)
3217 return err;
3218 if (!bh) /* A hole? */
3219 memset(data, 0, tocopy);
3220 else
3221 memcpy(data, bh->b_data+offset, tocopy);
3222 brelse(bh);
3223 offset = 0;
3224 toread -= tocopy;
3225 data += tocopy;
3226 blk++;
3227 }
3228 return len;
3229 }
3230
3231 /* Write to quotafile (we know the transaction is already started and has
3232 * enough credits) */
3233 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3234 const char *data, size_t len, loff_t off)
3235 {
3236 struct inode *inode = sb_dqopt(sb)->files[type];
3237 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3238 int err = 0;
3239 int offset = off & (sb->s_blocksize - 1);
3240 int tocopy;
3241 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3242 size_t towrite = len;
3243 struct buffer_head *bh;
3244 handle_t *handle = journal_current_handle();
3245
3246 if (!handle) {
3247 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3248 " cancelled because transaction is not started.\n",
3249 (unsigned long long)off, (unsigned long long)len);
3250 return -EIO;
3251 }
3252 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3253 while (towrite > 0) {
3254 tocopy = sb->s_blocksize - offset < towrite ?
3255 sb->s_blocksize - offset : towrite;
3256 bh = ext4_bread(handle, inode, blk, 1, &err);
3257 if (!bh)
3258 goto out;
3259 if (journal_quota) {
3260 err = ext4_journal_get_write_access(handle, bh);
3261 if (err) {
3262 brelse(bh);
3263 goto out;
3264 }
3265 }
3266 lock_buffer(bh);
3267 memcpy(bh->b_data+offset, data, tocopy);
3268 flush_dcache_page(bh->b_page);
3269 unlock_buffer(bh);
3270 if (journal_quota)
3271 err = ext4_journal_dirty_metadata(handle, bh);
3272 else {
3273 /* Always do at least ordered writes for quotas */
3274 err = ext4_journal_dirty_data(handle, bh);
3275 mark_buffer_dirty(bh);
3276 }
3277 brelse(bh);
3278 if (err)
3279 goto out;
3280 offset = 0;
3281 towrite -= tocopy;
3282 data += tocopy;
3283 blk++;
3284 }
3285 out:
3286 if (len == towrite)
3287 return err;
3288 if (inode->i_size < off+len-towrite) {
3289 i_size_write(inode, off+len-towrite);
3290 EXT4_I(inode)->i_disksize = inode->i_size;
3291 }
3292 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3293 ext4_mark_inode_dirty(handle, inode);
3294 mutex_unlock(&inode->i_mutex);
3295 return len - towrite;
3296 }
3297
3298 #endif
3299
3300 static int ext4_get_sb(struct file_system_type *fs_type,
3301 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3302 {
3303 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3304 }
3305
3306 static struct file_system_type ext4dev_fs_type = {
3307 .owner = THIS_MODULE,
3308 .name = "ext4dev",
3309 .get_sb = ext4_get_sb,
3310 .kill_sb = kill_block_super,
3311 .fs_flags = FS_REQUIRES_DEV,
3312 };
3313
3314 static int __init init_ext4_fs(void)
3315 {
3316 int err;
3317
3318 err = init_ext4_mballoc();
3319 if (err)
3320 return err;
3321
3322 err = init_ext4_xattr();
3323 if (err)
3324 goto out2;
3325 err = init_inodecache();
3326 if (err)
3327 goto out1;
3328 err = register_filesystem(&ext4dev_fs_type);
3329 if (err)
3330 goto out;
3331 return 0;
3332 out:
3333 destroy_inodecache();
3334 out1:
3335 exit_ext4_xattr();
3336 out2:
3337 exit_ext4_mballoc();
3338 return err;
3339 }
3340
3341 static void __exit exit_ext4_fs(void)
3342 {
3343 unregister_filesystem(&ext4dev_fs_type);
3344 destroy_inodecache();
3345 exit_ext4_xattr();
3346 exit_ext4_mballoc();
3347 }
3348
3349 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3350 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3351 MODULE_LICENSE("GPL");
3352 module_init(init_ext4_fs)
3353 module_exit(exit_ext4_fs)
Linux kernel - Deliverables
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