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ext4: Remove old legacy block allocator
[linux-2.6/linux-2.6-openrd.git] / fs / ext4 / super.c
blobdfcd41fafb9f3a5c166bba87d18c602e843f82f8
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/proc_fs.h>
38 #include <linux/log2.h>
39 #include <linux/crc16.h>
40 #include <asm/uaccess.h>
41
42 #include "ext4.h"
43 #include "ext4_jbd2.h"
44 #include "xattr.h"
45 #include "acl.h"
46 #include "namei.h"
47 #include "group.h"
48
49 struct proc_dir_entry *ext4_proc_root;
50
51 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
52 unsigned long journal_devnum);
53 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
54 unsigned int);
55 static void ext4_commit_super(struct super_block *sb,
56 struct ext4_super_block *es, int sync);
57 static void ext4_mark_recovery_complete(struct super_block *sb,
58 struct ext4_super_block *es);
59 static void ext4_clear_journal_err(struct super_block *sb,
60 struct ext4_super_block *es);
61 static int ext4_sync_fs(struct super_block *sb, int wait);
62 static const char *ext4_decode_error(struct super_block *sb, int errno,
63 char nbuf[16]);
64 static int ext4_remount(struct super_block *sb, int *flags, char *data);
65 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
66 static void ext4_unlockfs(struct super_block *sb);
67 static void ext4_write_super(struct super_block *sb);
68 static void ext4_write_super_lockfs(struct super_block *sb);
69
70
71 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
72 struct ext4_group_desc *bg)
73 {
74 return le32_to_cpu(bg->bg_block_bitmap_lo) |
75 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
76 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
77 }
78
79 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
80 struct ext4_group_desc *bg)
81 {
82 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
83 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
84 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
85 }
86
87 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
88 struct ext4_group_desc *bg)
89 {
90 return le32_to_cpu(bg->bg_inode_table_lo) |
91 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
92 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
93 }
94
95 void ext4_block_bitmap_set(struct super_block *sb,
96 struct ext4_group_desc *bg, ext4_fsblk_t blk)
97 {
98 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
99 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
100 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
101 }
102
103 void ext4_inode_bitmap_set(struct super_block *sb,
104 struct ext4_group_desc *bg, ext4_fsblk_t blk)
105 {
106 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
107 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
108 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
109 }
110
111 void ext4_inode_table_set(struct super_block *sb,
112 struct ext4_group_desc *bg, ext4_fsblk_t blk)
113 {
114 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
115 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
116 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
117 }
118
119 /*
120 * Wrappers for jbd2_journal_start/end.
121 *
122 * The only special thing we need to do here is to make sure that all
123 * journal_end calls result in the superblock being marked dirty, so
124 * that sync() will call the filesystem's write_super callback if
125 * appropriate.
126 */
127 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
128 {
129 journal_t *journal;
130
131 if (sb->s_flags & MS_RDONLY)
132 return ERR_PTR(-EROFS);
133
134 /* Special case here: if the journal has aborted behind our
135 * backs (eg. EIO in the commit thread), then we still need to
136 * take the FS itself readonly cleanly. */
137 journal = EXT4_SB(sb)->s_journal;
138 if (is_journal_aborted(journal)) {
139 ext4_abort(sb, __func__,
140 "Detected aborted journal");
141 return ERR_PTR(-EROFS);
142 }
143
144 return jbd2_journal_start(journal, nblocks);
145 }
146
147 /*
148 * The only special thing we need to do here is to make sure that all
149 * jbd2_journal_stop calls result in the superblock being marked dirty, so
150 * that sync() will call the filesystem's write_super callback if
151 * appropriate.
152 */
153 int __ext4_journal_stop(const char *where, handle_t *handle)
154 {
155 struct super_block *sb;
156 int err;
157 int rc;
158
159 sb = handle->h_transaction->t_journal->j_private;
160 err = handle->h_err;
161 rc = jbd2_journal_stop(handle);
162
163 if (!err)
164 err = rc;
165 if (err)
166 __ext4_std_error(sb, where, err);
167 return err;
168 }
169
170 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
171 struct buffer_head *bh, handle_t *handle, int err)
172 {
173 char nbuf[16];
174 const char *errstr = ext4_decode_error(NULL, err, nbuf);
175
176 if (bh)
177 BUFFER_TRACE(bh, "abort");
178
179 if (!handle->h_err)
180 handle->h_err = err;
181
182 if (is_handle_aborted(handle))
183 return;
184
185 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
186 caller, errstr, err_fn);
187
188 jbd2_journal_abort_handle(handle);
189 }
190
191 /* Deal with the reporting of failure conditions on a filesystem such as
192 * inconsistencies detected or read IO failures.
193 *
194 * On ext2, we can store the error state of the filesystem in the
195 * superblock. That is not possible on ext4, because we may have other
196 * write ordering constraints on the superblock which prevent us from
197 * writing it out straight away; and given that the journal is about to
198 * be aborted, we can't rely on the current, or future, transactions to
199 * write out the superblock safely.
200 *
201 * We'll just use the jbd2_journal_abort() error code to record an error in
202 * the journal instead. On recovery, the journal will compain about
203 * that error until we've noted it down and cleared it.
204 */
205
206 static void ext4_handle_error(struct super_block *sb)
207 {
208 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
209
210 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
211 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
212
213 if (sb->s_flags & MS_RDONLY)
214 return;
215
216 if (!test_opt(sb, ERRORS_CONT)) {
217 journal_t *journal = EXT4_SB(sb)->s_journal;
218
219 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
220 if (journal)
221 jbd2_journal_abort(journal, -EIO);
222 }
223 if (test_opt(sb, ERRORS_RO)) {
224 printk(KERN_CRIT "Remounting filesystem read-only\n");
225 sb->s_flags |= MS_RDONLY;
226 }
227 ext4_commit_super(sb, es, 1);
228 if (test_opt(sb, ERRORS_PANIC))
229 panic("EXT4-fs (device %s): panic forced after error\n",
230 sb->s_id);
231 }
232
233 void ext4_error(struct super_block *sb, const char *function,
234 const char *fmt, ...)
235 {
236 va_list args;
237
238 va_start(args, fmt);
239 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
240 vprintk(fmt, args);
241 printk("\n");
242 va_end(args);
243
244 ext4_handle_error(sb);
245 }
246
247 static const char *ext4_decode_error(struct super_block *sb, int errno,
248 char nbuf[16])
249 {
250 char *errstr = NULL;
251
252 switch (errno) {
253 case -EIO:
254 errstr = "IO failure";
255 break;
256 case -ENOMEM:
257 errstr = "Out of memory";
258 break;
259 case -EROFS:
260 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
261 errstr = "Journal has aborted";
262 else
263 errstr = "Readonly filesystem";
264 break;
265 default:
266 /* If the caller passed in an extra buffer for unknown
267 * errors, textualise them now. Else we just return
268 * NULL. */
269 if (nbuf) {
270 /* Check for truncated error codes... */
271 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
272 errstr = nbuf;
273 }
274 break;
275 }
276
277 return errstr;
278 }
279
280 /* __ext4_std_error decodes expected errors from journaling functions
281 * automatically and invokes the appropriate error response. */
282
283 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
284 {
285 char nbuf[16];
286 const char *errstr;
287
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
290 * an error. */
291 if (errno == -EROFS && journal_current_handle() == NULL &&
292 (sb->s_flags & MS_RDONLY))
293 return;
294
295 errstr = ext4_decode_error(sb, errno, nbuf);
296 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
297 sb->s_id, function, errstr);
298
299 ext4_handle_error(sb);
300 }
301
302 /*
303 * ext4_abort is a much stronger failure handler than ext4_error. The
304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
306 *
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
310 */
311
312 void ext4_abort(struct super_block *sb, const char *function,
313 const char *fmt, ...)
314 {
315 va_list args;
316
317 printk(KERN_CRIT "ext4_abort called.\n");
318
319 va_start(args, fmt);
320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
326 panic("EXT4-fs panic from previous error\n");
327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
333 sb->s_flags |= MS_RDONLY;
334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
336 }
337
338 void ext4_warning(struct super_block *sb, const char *function,
339 const char *fmt, ...)
340 {
341 va_list args;
342
343 va_start(args, fmt);
344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349 }
350
351 void ext4_update_dynamic_rev(struct super_block *sb)
352 {
353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
354
355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
356 return;
357
358 ext4_warning(sb, __func__,
359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
361 EXT4_DYNAMIC_REV);
362
363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
368
369 /*
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
373 */
374 }
375
376 int ext4_update_compat_feature(handle_t *handle,
377 struct super_block *sb, __u32 compat)
378 {
379 int err = 0;
380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
381 err = ext4_journal_get_write_access(handle,
382 EXT4_SB(sb)->s_sbh);
383 if (err)
384 return err;
385 EXT4_SET_COMPAT_FEATURE(sb, compat);
386 sb->s_dirt = 1;
387 handle->h_sync = 1;
388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
389 "call ext4_journal_dirty_met adata");
390 err = ext4_journal_dirty_metadata(handle,
391 EXT4_SB(sb)->s_sbh);
392 }
393 return err;
394 }
395
396 int ext4_update_rocompat_feature(handle_t *handle,
397 struct super_block *sb, __u32 rocompat)
398 {
399 int err = 0;
400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
401 err = ext4_journal_get_write_access(handle,
402 EXT4_SB(sb)->s_sbh);
403 if (err)
404 return err;
405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
406 sb->s_dirt = 1;
407 handle->h_sync = 1;
408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
409 "call ext4_journal_dirty_met adata");
410 err = ext4_journal_dirty_metadata(handle,
411 EXT4_SB(sb)->s_sbh);
412 }
413 return err;
414 }
415
416 int ext4_update_incompat_feature(handle_t *handle,
417 struct super_block *sb, __u32 incompat)
418 {
419 int err = 0;
420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
421 err = ext4_journal_get_write_access(handle,
422 EXT4_SB(sb)->s_sbh);
423 if (err)
424 return err;
425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
426 sb->s_dirt = 1;
427 handle->h_sync = 1;
428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
429 "call ext4_journal_dirty_met adata");
430 err = ext4_journal_dirty_metadata(handle,
431 EXT4_SB(sb)->s_sbh);
432 }
433 return err;
434 }
435
436 /*
437 * Open the external journal device
438 */
439 static struct block_device *ext4_blkdev_get(dev_t dev)
440 {
441 struct block_device *bdev;
442 char b[BDEVNAME_SIZE];
443
444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
445 if (IS_ERR(bdev))
446 goto fail;
447 return bdev;
448
449 fail:
450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
451 __bdevname(dev, b), PTR_ERR(bdev));
452 return NULL;
453 }
454
455 /*
456 * Release the journal device
457 */
458 static int ext4_blkdev_put(struct block_device *bdev)
459 {
460 bd_release(bdev);
461 return blkdev_put(bdev);
462 }
463
464 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
465 {
466 struct block_device *bdev;
467 int ret = -ENODEV;
468
469 bdev = sbi->journal_bdev;
470 if (bdev) {
471 ret = ext4_blkdev_put(bdev);
472 sbi->journal_bdev = NULL;
473 }
474 return ret;
475 }
476
477 static inline struct inode *orphan_list_entry(struct list_head *l)
478 {
479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
480 }
481
482 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
483 {
484 struct list_head *l;
485
486 printk(KERN_ERR "sb orphan head is %d\n",
487 le32_to_cpu(sbi->s_es->s_last_orphan));
488
489 printk(KERN_ERR "sb_info orphan list:\n");
490 list_for_each(l, &sbi->s_orphan) {
491 struct inode *inode = orphan_list_entry(l);
492 printk(KERN_ERR " "
493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
494 inode->i_sb->s_id, inode->i_ino, inode,
495 inode->i_mode, inode->i_nlink,
496 NEXT_ORPHAN(inode));
497 }
498 }
499
500 static void ext4_put_super(struct super_block *sb)
501 {
502 struct ext4_sb_info *sbi = EXT4_SB(sb);
503 struct ext4_super_block *es = sbi->s_es;
504 int i;
505
506 ext4_mb_release(sb);
507 ext4_ext_release(sb);
508 ext4_xattr_put_super(sb);
509 jbd2_journal_destroy(sbi->s_journal);
510 sbi->s_journal = NULL;
511 if (!(sb->s_flags & MS_RDONLY)) {
512 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
513 es->s_state = cpu_to_le16(sbi->s_mount_state);
514 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
515 mark_buffer_dirty(sbi->s_sbh);
516 ext4_commit_super(sb, es, 1);
517 }
518 if (sbi->s_proc) {
519 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
520 remove_proc_entry(sb->s_id, ext4_proc_root);
521 }
522
523 for (i = 0; i < sbi->s_gdb_count; i++)
524 brelse(sbi->s_group_desc[i]);
525 kfree(sbi->s_group_desc);
526 kfree(sbi->s_flex_groups);
527 percpu_counter_destroy(&sbi->s_freeblocks_counter);
528 percpu_counter_destroy(&sbi->s_freeinodes_counter);
529 percpu_counter_destroy(&sbi->s_dirs_counter);
530 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
531 brelse(sbi->s_sbh);
532 #ifdef CONFIG_QUOTA
533 for (i = 0; i < MAXQUOTAS; i++)
534 kfree(sbi->s_qf_names[i]);
535 #endif
536
537 /* Debugging code just in case the in-memory inode orphan list
538 * isn't empty. The on-disk one can be non-empty if we've
539 * detected an error and taken the fs readonly, but the
540 * in-memory list had better be clean by this point. */
541 if (!list_empty(&sbi->s_orphan))
542 dump_orphan_list(sb, sbi);
543 J_ASSERT(list_empty(&sbi->s_orphan));
544
545 invalidate_bdev(sb->s_bdev);
546 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
547 /*
548 * Invalidate the journal device's buffers. We don't want them
549 * floating about in memory - the physical journal device may
550 * hotswapped, and it breaks the `ro-after' testing code.
551 */
552 sync_blockdev(sbi->journal_bdev);
553 invalidate_bdev(sbi->journal_bdev);
554 ext4_blkdev_remove(sbi);
555 }
556 sb->s_fs_info = NULL;
557 kfree(sbi);
558 return;
559 }
560
561 static struct kmem_cache *ext4_inode_cachep;
562
563 /*
564 * Called inside transaction, so use GFP_NOFS
565 */
566 static struct inode *ext4_alloc_inode(struct super_block *sb)
567 {
568 struct ext4_inode_info *ei;
569
570 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
571 if (!ei)
572 return NULL;
573 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
574 ei->i_acl = EXT4_ACL_NOT_CACHED;
575 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
576 #endif
577 ei->vfs_inode.i_version = 1;
578 ei->vfs_inode.i_data.writeback_index = 0;
579 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
580 INIT_LIST_HEAD(&ei->i_prealloc_list);
581 spin_lock_init(&ei->i_prealloc_lock);
582 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
583 ei->i_reserved_data_blocks = 0;
584 ei->i_reserved_meta_blocks = 0;
585 ei->i_allocated_meta_blocks = 0;
586 ei->i_delalloc_reserved_flag = 0;
587 spin_lock_init(&(ei->i_block_reservation_lock));
588 return &ei->vfs_inode;
589 }
590
591 static void ext4_destroy_inode(struct inode *inode)
592 {
593 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
594 printk("EXT4 Inode %p: orphan list check failed!\n",
595 EXT4_I(inode));
596 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
597 EXT4_I(inode), sizeof(struct ext4_inode_info),
598 true);
599 dump_stack();
600 }
601 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
602 }
603
604 static void init_once(void *foo)
605 {
606 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
607
608 INIT_LIST_HEAD(&ei->i_orphan);
609 #ifdef CONFIG_EXT4DEV_FS_XATTR
610 init_rwsem(&ei->xattr_sem);
611 #endif
612 init_rwsem(&ei->i_data_sem);
613 inode_init_once(&ei->vfs_inode);
614 }
615
616 static int init_inodecache(void)
617 {
618 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
619 sizeof(struct ext4_inode_info),
620 0, (SLAB_RECLAIM_ACCOUNT|
621 SLAB_MEM_SPREAD),
622 init_once);
623 if (ext4_inode_cachep == NULL)
624 return -ENOMEM;
625 return 0;
626 }
627
628 static void destroy_inodecache(void)
629 {
630 kmem_cache_destroy(ext4_inode_cachep);
631 }
632
633 static void ext4_clear_inode(struct inode *inode)
634 {
635 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
636 if (EXT4_I(inode)->i_acl &&
637 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
638 posix_acl_release(EXT4_I(inode)->i_acl);
639 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
640 }
641 if (EXT4_I(inode)->i_default_acl &&
642 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
643 posix_acl_release(EXT4_I(inode)->i_default_acl);
644 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
645 }
646 #endif
647 ext4_discard_preallocations(inode);
648 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
649 &EXT4_I(inode)->jinode);
650 }
651
652 static inline void ext4_show_quota_options(struct seq_file *seq,
653 struct super_block *sb)
654 {
655 #if defined(CONFIG_QUOTA)
656 struct ext4_sb_info *sbi = EXT4_SB(sb);
657
658 if (sbi->s_jquota_fmt)
659 seq_printf(seq, ",jqfmt=%s",
660 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
661
662 if (sbi->s_qf_names[USRQUOTA])
663 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
664
665 if (sbi->s_qf_names[GRPQUOTA])
666 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
667
668 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
669 seq_puts(seq, ",usrquota");
670
671 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
672 seq_puts(seq, ",grpquota");
673 #endif
674 }
675
676 /*
677 * Show an option if
678 * - it's set to a non-default value OR
679 * - if the per-sb default is different from the global default
680 */
681 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
682 {
683 int def_errors;
684 unsigned long def_mount_opts;
685 struct super_block *sb = vfs->mnt_sb;
686 struct ext4_sb_info *sbi = EXT4_SB(sb);
687 struct ext4_super_block *es = sbi->s_es;
688
689 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
690 def_errors = le16_to_cpu(es->s_errors);
691
692 if (sbi->s_sb_block != 1)
693 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
694 if (test_opt(sb, MINIX_DF))
695 seq_puts(seq, ",minixdf");
696 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
697 seq_puts(seq, ",grpid");
698 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
699 seq_puts(seq, ",nogrpid");
700 if (sbi->s_resuid != EXT4_DEF_RESUID ||
701 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
702 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
703 }
704 if (sbi->s_resgid != EXT4_DEF_RESGID ||
705 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
706 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
707 }
708 if (test_opt(sb, ERRORS_RO)) {
709 if (def_errors == EXT4_ERRORS_PANIC ||
710 def_errors == EXT4_ERRORS_CONTINUE) {
711 seq_puts(seq, ",errors=remount-ro");
712 }
713 }
714 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
715 seq_puts(seq, ",errors=continue");
716 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
717 seq_puts(seq, ",errors=panic");
718 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
719 seq_puts(seq, ",nouid32");
720 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
721 seq_puts(seq, ",debug");
722 if (test_opt(sb, OLDALLOC))
723 seq_puts(seq, ",oldalloc");
724 #ifdef CONFIG_EXT4DEV_FS_XATTR
725 if (test_opt(sb, XATTR_USER) &&
726 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
727 seq_puts(seq, ",user_xattr");
728 if (!test_opt(sb, XATTR_USER) &&
729 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
730 seq_puts(seq, ",nouser_xattr");
731 }
732 #endif
733 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
734 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
735 seq_puts(seq, ",acl");
736 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
737 seq_puts(seq, ",noacl");
738 #endif
739 if (!test_opt(sb, RESERVATION))
740 seq_puts(seq, ",noreservation");
741 if (sbi->s_commit_interval) {
742 seq_printf(seq, ",commit=%u",
743 (unsigned) (sbi->s_commit_interval / HZ));
744 }
745 /*
746 * We're changing the default of barrier mount option, so
747 * let's always display its mount state so it's clear what its
748 * status is.
749 */
750 seq_puts(seq, ",barrier=");
751 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
752 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
753 seq_puts(seq, ",journal_async_commit");
754 if (test_opt(sb, NOBH))
755 seq_puts(seq, ",nobh");
756 if (!test_opt(sb, EXTENTS))
757 seq_puts(seq, ",noextents");
758 if (test_opt(sb, I_VERSION))
759 seq_puts(seq, ",i_version");
760 if (!test_opt(sb, DELALLOC))
761 seq_puts(seq, ",nodelalloc");
762
763
764 if (sbi->s_stripe)
765 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
766 /*
767 * journal mode get enabled in different ways
768 * So just print the value even if we didn't specify it
769 */
770 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
771 seq_puts(seq, ",data=journal");
772 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
773 seq_puts(seq, ",data=ordered");
774 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
775 seq_puts(seq, ",data=writeback");
776
777 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
778 seq_printf(seq, ",inode_readahead_blks=%u",
779 sbi->s_inode_readahead_blks);
780
781 ext4_show_quota_options(seq, sb);
782 return 0;
783 }
784
785
786 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
787 u64 ino, u32 generation)
788 {
789 struct inode *inode;
790
791 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
792 return ERR_PTR(-ESTALE);
793 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
794 return ERR_PTR(-ESTALE);
795
796 /* iget isn't really right if the inode is currently unallocated!!
797 *
798 * ext4_read_inode will return a bad_inode if the inode had been
799 * deleted, so we should be safe.
800 *
801 * Currently we don't know the generation for parent directory, so
802 * a generation of 0 means "accept any"
803 */
804 inode = ext4_iget(sb, ino);
805 if (IS_ERR(inode))
806 return ERR_CAST(inode);
807 if (generation && inode->i_generation != generation) {
808 iput(inode);
809 return ERR_PTR(-ESTALE);
810 }
811
812 return inode;
813 }
814
815 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
816 int fh_len, int fh_type)
817 {
818 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
819 ext4_nfs_get_inode);
820 }
821
822 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
823 int fh_len, int fh_type)
824 {
825 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
826 ext4_nfs_get_inode);
827 }
828
829 #ifdef CONFIG_QUOTA
830 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
831 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
832
833 static int ext4_dquot_initialize(struct inode *inode, int type);
834 static int ext4_dquot_drop(struct inode *inode);
835 static int ext4_write_dquot(struct dquot *dquot);
836 static int ext4_acquire_dquot(struct dquot *dquot);
837 static int ext4_release_dquot(struct dquot *dquot);
838 static int ext4_mark_dquot_dirty(struct dquot *dquot);
839 static int ext4_write_info(struct super_block *sb, int type);
840 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
841 char *path, int remount);
842 static int ext4_quota_on_mount(struct super_block *sb, int type);
843 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
844 size_t len, loff_t off);
845 static ssize_t ext4_quota_write(struct super_block *sb, int type,
846 const char *data, size_t len, loff_t off);
847
848 static struct dquot_operations ext4_quota_operations = {
849 .initialize = ext4_dquot_initialize,
850 .drop = ext4_dquot_drop,
851 .alloc_space = dquot_alloc_space,
852 .alloc_inode = dquot_alloc_inode,
853 .free_space = dquot_free_space,
854 .free_inode = dquot_free_inode,
855 .transfer = dquot_transfer,
856 .write_dquot = ext4_write_dquot,
857 .acquire_dquot = ext4_acquire_dquot,
858 .release_dquot = ext4_release_dquot,
859 .mark_dirty = ext4_mark_dquot_dirty,
860 .write_info = ext4_write_info
861 };
862
863 static struct quotactl_ops ext4_qctl_operations = {
864 .quota_on = ext4_quota_on,
865 .quota_off = vfs_quota_off,
866 .quota_sync = vfs_quota_sync,
867 .get_info = vfs_get_dqinfo,
868 .set_info = vfs_set_dqinfo,
869 .get_dqblk = vfs_get_dqblk,
870 .set_dqblk = vfs_set_dqblk
871 };
872 #endif
873
874 static const struct super_operations ext4_sops = {
875 .alloc_inode = ext4_alloc_inode,
876 .destroy_inode = ext4_destroy_inode,
877 .write_inode = ext4_write_inode,
878 .dirty_inode = ext4_dirty_inode,
879 .delete_inode = ext4_delete_inode,
880 .put_super = ext4_put_super,
881 .write_super = ext4_write_super,
882 .sync_fs = ext4_sync_fs,
883 .write_super_lockfs = ext4_write_super_lockfs,
884 .unlockfs = ext4_unlockfs,
885 .statfs = ext4_statfs,
886 .remount_fs = ext4_remount,
887 .clear_inode = ext4_clear_inode,
888 .show_options = ext4_show_options,
889 #ifdef CONFIG_QUOTA
890 .quota_read = ext4_quota_read,
891 .quota_write = ext4_quota_write,
892 #endif
893 };
894
895 static const struct export_operations ext4_export_ops = {
896 .fh_to_dentry = ext4_fh_to_dentry,
897 .fh_to_parent = ext4_fh_to_parent,
898 .get_parent = ext4_get_parent,
899 };
900
901 enum {
902 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
903 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
904 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
905 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
906 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
907 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
908 Opt_journal_checksum, Opt_journal_async_commit,
909 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
910 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
911 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
912 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
913 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
914 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
915 Opt_inode_readahead_blks
916 };
917
918 static match_table_t tokens = {
919 {Opt_bsd_df, "bsddf"},
920 {Opt_minix_df, "minixdf"},
921 {Opt_grpid, "grpid"},
922 {Opt_grpid, "bsdgroups"},
923 {Opt_nogrpid, "nogrpid"},
924 {Opt_nogrpid, "sysvgroups"},
925 {Opt_resgid, "resgid=%u"},
926 {Opt_resuid, "resuid=%u"},
927 {Opt_sb, "sb=%u"},
928 {Opt_err_cont, "errors=continue"},
929 {Opt_err_panic, "errors=panic"},
930 {Opt_err_ro, "errors=remount-ro"},
931 {Opt_nouid32, "nouid32"},
932 {Opt_nocheck, "nocheck"},
933 {Opt_nocheck, "check=none"},
934 {Opt_debug, "debug"},
935 {Opt_oldalloc, "oldalloc"},
936 {Opt_orlov, "orlov"},
937 {Opt_user_xattr, "user_xattr"},
938 {Opt_nouser_xattr, "nouser_xattr"},
939 {Opt_acl, "acl"},
940 {Opt_noacl, "noacl"},
941 {Opt_reservation, "reservation"},
942 {Opt_noreservation, "noreservation"},
943 {Opt_noload, "noload"},
944 {Opt_nobh, "nobh"},
945 {Opt_bh, "bh"},
946 {Opt_commit, "commit=%u"},
947 {Opt_journal_update, "journal=update"},
948 {Opt_journal_inum, "journal=%u"},
949 {Opt_journal_dev, "journal_dev=%u"},
950 {Opt_journal_checksum, "journal_checksum"},
951 {Opt_journal_async_commit, "journal_async_commit"},
952 {Opt_abort, "abort"},
953 {Opt_data_journal, "data=journal"},
954 {Opt_data_ordered, "data=ordered"},
955 {Opt_data_writeback, "data=writeback"},
956 {Opt_offusrjquota, "usrjquota="},
957 {Opt_usrjquota, "usrjquota=%s"},
958 {Opt_offgrpjquota, "grpjquota="},
959 {Opt_grpjquota, "grpjquota=%s"},
960 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
961 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
962 {Opt_grpquota, "grpquota"},
963 {Opt_noquota, "noquota"},
964 {Opt_quota, "quota"},
965 {Opt_usrquota, "usrquota"},
966 {Opt_barrier, "barrier=%u"},
967 {Opt_extents, "extents"},
968 {Opt_noextents, "noextents"},
969 {Opt_i_version, "i_version"},
970 {Opt_mballoc, "mballoc"},
971 {Opt_nomballoc, "nomballoc"},
972 {Opt_stripe, "stripe=%u"},
973 {Opt_resize, "resize"},
974 {Opt_delalloc, "delalloc"},
975 {Opt_nodelalloc, "nodelalloc"},
976 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
977 {Opt_err, NULL},
978 };
979
980 static ext4_fsblk_t get_sb_block(void **data)
981 {
982 ext4_fsblk_t sb_block;
983 char *options = (char *) *data;
984
985 if (!options || strncmp(options, "sb=", 3) != 0)
986 return 1; /* Default location */
987 options += 3;
988 /*todo: use simple_strtoll with >32bit ext4 */
989 sb_block = simple_strtoul(options, &options, 0);
990 if (*options && *options != ',') {
991 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
992 (char *) *data);
993 return 1;
994 }
995 if (*options == ',')
996 options++;
997 *data = (void *) options;
998 return sb_block;
999 }
1000
1001 static int parse_options(char *options, struct super_block *sb,
1002 unsigned int *inum, unsigned long *journal_devnum,
1003 ext4_fsblk_t *n_blocks_count, int is_remount)
1004 {
1005 struct ext4_sb_info *sbi = EXT4_SB(sb);
1006 char *p;
1007 substring_t args[MAX_OPT_ARGS];
1008 int data_opt = 0;
1009 int option;
1010 #ifdef CONFIG_QUOTA
1011 int qtype, qfmt;
1012 char *qname;
1013 #endif
1014 ext4_fsblk_t last_block;
1015
1016 if (!options)
1017 return 1;
1018
1019 while ((p = strsep(&options, ",")) != NULL) {
1020 int token;
1021 if (!*p)
1022 continue;
1023
1024 token = match_token(p, tokens, args);
1025 switch (token) {
1026 case Opt_bsd_df:
1027 clear_opt(sbi->s_mount_opt, MINIX_DF);
1028 break;
1029 case Opt_minix_df:
1030 set_opt(sbi->s_mount_opt, MINIX_DF);
1031 break;
1032 case Opt_grpid:
1033 set_opt(sbi->s_mount_opt, GRPID);
1034 break;
1035 case Opt_nogrpid:
1036 clear_opt(sbi->s_mount_opt, GRPID);
1037 break;
1038 case Opt_resuid:
1039 if (match_int(&args[0], &option))
1040 return 0;
1041 sbi->s_resuid = option;
1042 break;
1043 case Opt_resgid:
1044 if (match_int(&args[0], &option))
1045 return 0;
1046 sbi->s_resgid = option;
1047 break;
1048 case Opt_sb:
1049 /* handled by get_sb_block() instead of here */
1050 /* *sb_block = match_int(&args[0]); */
1051 break;
1052 case Opt_err_panic:
1053 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1054 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1055 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1056 break;
1057 case Opt_err_ro:
1058 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1059 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1060 set_opt(sbi->s_mount_opt, ERRORS_RO);
1061 break;
1062 case Opt_err_cont:
1063 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1064 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1065 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1066 break;
1067 case Opt_nouid32:
1068 set_opt(sbi->s_mount_opt, NO_UID32);
1069 break;
1070 case Opt_nocheck:
1071 clear_opt(sbi->s_mount_opt, CHECK);
1072 break;
1073 case Opt_debug:
1074 set_opt(sbi->s_mount_opt, DEBUG);
1075 break;
1076 case Opt_oldalloc:
1077 set_opt(sbi->s_mount_opt, OLDALLOC);
1078 break;
1079 case Opt_orlov:
1080 clear_opt(sbi->s_mount_opt, OLDALLOC);
1081 break;
1082 #ifdef CONFIG_EXT4DEV_FS_XATTR
1083 case Opt_user_xattr:
1084 set_opt(sbi->s_mount_opt, XATTR_USER);
1085 break;
1086 case Opt_nouser_xattr:
1087 clear_opt(sbi->s_mount_opt, XATTR_USER);
1088 break;
1089 #else
1090 case Opt_user_xattr:
1091 case Opt_nouser_xattr:
1092 printk(KERN_ERR "EXT4 (no)user_xattr options "
1093 "not supported\n");
1094 break;
1095 #endif
1096 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1097 case Opt_acl:
1098 set_opt(sbi->s_mount_opt, POSIX_ACL);
1099 break;
1100 case Opt_noacl:
1101 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1102 break;
1103 #else
1104 case Opt_acl:
1105 case Opt_noacl:
1106 printk(KERN_ERR "EXT4 (no)acl options "
1107 "not supported\n");
1108 break;
1109 #endif
1110 case Opt_reservation:
1111 set_opt(sbi->s_mount_opt, RESERVATION);
1112 break;
1113 case Opt_noreservation:
1114 clear_opt(sbi->s_mount_opt, RESERVATION);
1115 break;
1116 case Opt_journal_update:
1117 /* @@@ FIXME */
1118 /* Eventually we will want to be able to create
1119 a journal file here. For now, only allow the
1120 user to specify an existing inode to be the
1121 journal file. */
1122 if (is_remount) {
1123 printk(KERN_ERR "EXT4-fs: cannot specify "
1124 "journal on remount\n");
1125 return 0;
1126 }
1127 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1128 break;
1129 case Opt_journal_inum:
1130 if (is_remount) {
1131 printk(KERN_ERR "EXT4-fs: cannot specify "
1132 "journal on remount\n");
1133 return 0;
1134 }
1135 if (match_int(&args[0], &option))
1136 return 0;
1137 *inum = option;
1138 break;
1139 case Opt_journal_dev:
1140 if (is_remount) {
1141 printk(KERN_ERR "EXT4-fs: cannot specify "
1142 "journal on remount\n");
1143 return 0;
1144 }
1145 if (match_int(&args[0], &option))
1146 return 0;
1147 *journal_devnum = option;
1148 break;
1149 case Opt_journal_checksum:
1150 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1151 break;
1152 case Opt_journal_async_commit:
1153 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1154 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1155 break;
1156 case Opt_noload:
1157 set_opt(sbi->s_mount_opt, NOLOAD);
1158 break;
1159 case Opt_commit:
1160 if (match_int(&args[0], &option))
1161 return 0;
1162 if (option < 0)
1163 return 0;
1164 if (option == 0)
1165 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1166 sbi->s_commit_interval = HZ * option;
1167 break;
1168 case Opt_data_journal:
1169 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1170 goto datacheck;
1171 case Opt_data_ordered:
1172 data_opt = EXT4_MOUNT_ORDERED_DATA;
1173 goto datacheck;
1174 case Opt_data_writeback:
1175 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1176 datacheck:
1177 if (is_remount) {
1178 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1179 != data_opt) {
1180 printk(KERN_ERR
1181 "EXT4-fs: cannot change data "
1182 "mode on remount\n");
1183 return 0;
1184 }
1185 } else {
1186 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1187 sbi->s_mount_opt |= data_opt;
1188 }
1189 break;
1190 #ifdef CONFIG_QUOTA
1191 case Opt_usrjquota:
1192 qtype = USRQUOTA;
1193 goto set_qf_name;
1194 case Opt_grpjquota:
1195 qtype = GRPQUOTA;
1196 set_qf_name:
1197 if ((sb_any_quota_enabled(sb) ||
1198 sb_any_quota_suspended(sb)) &&
1199 !sbi->s_qf_names[qtype]) {
1200 printk(KERN_ERR
1201 "EXT4-fs: Cannot change journaled "
1202 "quota options when quota turned on.\n");
1203 return 0;
1204 }
1205 qname = match_strdup(&args[0]);
1206 if (!qname) {
1207 printk(KERN_ERR
1208 "EXT4-fs: not enough memory for "
1209 "storing quotafile name.\n");
1210 return 0;
1211 }
1212 if (sbi->s_qf_names[qtype] &&
1213 strcmp(sbi->s_qf_names[qtype], qname)) {
1214 printk(KERN_ERR
1215 "EXT4-fs: %s quota file already "
1216 "specified.\n", QTYPE2NAME(qtype));
1217 kfree(qname);
1218 return 0;
1219 }
1220 sbi->s_qf_names[qtype] = qname;
1221 if (strchr(sbi->s_qf_names[qtype], '/')) {
1222 printk(KERN_ERR
1223 "EXT4-fs: quotafile must be on "
1224 "filesystem root.\n");
1225 kfree(sbi->s_qf_names[qtype]);
1226 sbi->s_qf_names[qtype] = NULL;
1227 return 0;
1228 }
1229 set_opt(sbi->s_mount_opt, QUOTA);
1230 break;
1231 case Opt_offusrjquota:
1232 qtype = USRQUOTA;
1233 goto clear_qf_name;
1234 case Opt_offgrpjquota:
1235 qtype = GRPQUOTA;
1236 clear_qf_name:
1237 if ((sb_any_quota_enabled(sb) ||
1238 sb_any_quota_suspended(sb)) &&
1239 sbi->s_qf_names[qtype]) {
1240 printk(KERN_ERR "EXT4-fs: Cannot change "
1241 "journaled quota options when "
1242 "quota turned on.\n");
1243 return 0;
1244 }
1245 /*
1246 * The space will be released later when all options
1247 * are confirmed to be correct
1248 */
1249 sbi->s_qf_names[qtype] = NULL;
1250 break;
1251 case Opt_jqfmt_vfsold:
1252 qfmt = QFMT_VFS_OLD;
1253 goto set_qf_format;
1254 case Opt_jqfmt_vfsv0:
1255 qfmt = QFMT_VFS_V0;
1256 set_qf_format:
1257 if ((sb_any_quota_enabled(sb) ||
1258 sb_any_quota_suspended(sb)) &&
1259 sbi->s_jquota_fmt != qfmt) {
1260 printk(KERN_ERR "EXT4-fs: Cannot change "
1261 "journaled quota options when "
1262 "quota turned on.\n");
1263 return 0;
1264 }
1265 sbi->s_jquota_fmt = qfmt;
1266 break;
1267 case Opt_quota:
1268 case Opt_usrquota:
1269 set_opt(sbi->s_mount_opt, QUOTA);
1270 set_opt(sbi->s_mount_opt, USRQUOTA);
1271 break;
1272 case Opt_grpquota:
1273 set_opt(sbi->s_mount_opt, QUOTA);
1274 set_opt(sbi->s_mount_opt, GRPQUOTA);
1275 break;
1276 case Opt_noquota:
1277 if (sb_any_quota_enabled(sb)) {
1278 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1279 "options when quota turned on.\n");
1280 return 0;
1281 }
1282 clear_opt(sbi->s_mount_opt, QUOTA);
1283 clear_opt(sbi->s_mount_opt, USRQUOTA);
1284 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1285 break;
1286 #else
1287 case Opt_quota:
1288 case Opt_usrquota:
1289 case Opt_grpquota:
1290 printk(KERN_ERR
1291 "EXT4-fs: quota options not supported.\n");
1292 break;
1293 case Opt_usrjquota:
1294 case Opt_grpjquota:
1295 case Opt_offusrjquota:
1296 case Opt_offgrpjquota:
1297 case Opt_jqfmt_vfsold:
1298 case Opt_jqfmt_vfsv0:
1299 printk(KERN_ERR
1300 "EXT4-fs: journaled quota options not "
1301 "supported.\n");
1302 break;
1303 case Opt_noquota:
1304 break;
1305 #endif
1306 case Opt_abort:
1307 set_opt(sbi->s_mount_opt, ABORT);
1308 break;
1309 case Opt_barrier:
1310 if (match_int(&args[0], &option))
1311 return 0;
1312 if (option)
1313 set_opt(sbi->s_mount_opt, BARRIER);
1314 else
1315 clear_opt(sbi->s_mount_opt, BARRIER);
1316 break;
1317 case Opt_ignore:
1318 break;
1319 case Opt_resize:
1320 if (!is_remount) {
1321 printk("EXT4-fs: resize option only available "
1322 "for remount\n");
1323 return 0;
1324 }
1325 if (match_int(&args[0], &option) != 0)
1326 return 0;
1327 *n_blocks_count = option;
1328 break;
1329 case Opt_nobh:
1330 set_opt(sbi->s_mount_opt, NOBH);
1331 break;
1332 case Opt_bh:
1333 clear_opt(sbi->s_mount_opt, NOBH);
1334 break;
1335 case Opt_extents:
1336 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1337 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1338 ext4_warning(sb, __func__,
1339 "extents feature not enabled "
1340 "on this filesystem, use tune2fs\n");
1341 return 0;
1342 }
1343 set_opt(sbi->s_mount_opt, EXTENTS);
1344 break;
1345 case Opt_noextents:
1346 /*
1347 * When e2fsprogs support resizing an already existing
1348 * ext3 file system to greater than 2**32 we need to
1349 * add support to block allocator to handle growing
1350 * already existing block mapped inode so that blocks
1351 * allocated for them fall within 2**32
1352 */
1353 last_block = ext4_blocks_count(sbi->s_es) - 1;
1354 if (last_block > 0xffffffffULL) {
1355 printk(KERN_ERR "EXT4-fs: Filesystem too "
1356 "large to mount with "
1357 "-o noextents options\n");
1358 return 0;
1359 }
1360 clear_opt(sbi->s_mount_opt, EXTENTS);
1361 break;
1362 case Opt_i_version:
1363 set_opt(sbi->s_mount_opt, I_VERSION);
1364 sb->s_flags |= MS_I_VERSION;
1365 break;
1366 case Opt_nodelalloc:
1367 clear_opt(sbi->s_mount_opt, DELALLOC);
1368 break;
1369 case Opt_stripe:
1370 if (match_int(&args[0], &option))
1371 return 0;
1372 if (option < 0)
1373 return 0;
1374 sbi->s_stripe = option;
1375 break;
1376 case Opt_delalloc:
1377 set_opt(sbi->s_mount_opt, DELALLOC);
1378 break;
1379 case Opt_inode_readahead_blks:
1380 if (match_int(&args[0], &option))
1381 return 0;
1382 if (option < 0 || option > (1 << 30))
1383 return 0;
1384 sbi->s_inode_readahead_blks = option;
1385 break;
1386 default:
1387 printk(KERN_ERR
1388 "EXT4-fs: Unrecognized mount option \"%s\" "
1389 "or missing value\n", p);
1390 return 0;
1391 }
1392 }
1393 #ifdef CONFIG_QUOTA
1394 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1395 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1396 sbi->s_qf_names[USRQUOTA])
1397 clear_opt(sbi->s_mount_opt, USRQUOTA);
1398
1399 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1400 sbi->s_qf_names[GRPQUOTA])
1401 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1402
1403 if ((sbi->s_qf_names[USRQUOTA] &&
1404 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1405 (sbi->s_qf_names[GRPQUOTA] &&
1406 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1407 printk(KERN_ERR "EXT4-fs: old and new quota "
1408 "format mixing.\n");
1409 return 0;
1410 }
1411
1412 if (!sbi->s_jquota_fmt) {
1413 printk(KERN_ERR "EXT4-fs: journaled quota format "
1414 "not specified.\n");
1415 return 0;
1416 }
1417 } else {
1418 if (sbi->s_jquota_fmt) {
1419 printk(KERN_ERR "EXT4-fs: journaled quota format "
1420 "specified with no journaling "
1421 "enabled.\n");
1422 return 0;
1423 }
1424 }
1425 #endif
1426 return 1;
1427 }
1428
1429 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1430 int read_only)
1431 {
1432 struct ext4_sb_info *sbi = EXT4_SB(sb);
1433 int res = 0;
1434
1435 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1436 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1437 "forcing read-only mode\n");
1438 res = MS_RDONLY;
1439 }
1440 if (read_only)
1441 return res;
1442 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1443 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1444 "running e2fsck is recommended\n");
1445 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1446 printk(KERN_WARNING
1447 "EXT4-fs warning: mounting fs with errors, "
1448 "running e2fsck is recommended\n");
1449 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1450 le16_to_cpu(es->s_mnt_count) >=
1451 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1452 printk(KERN_WARNING
1453 "EXT4-fs warning: maximal mount count reached, "
1454 "running e2fsck is recommended\n");
1455 else if (le32_to_cpu(es->s_checkinterval) &&
1456 (le32_to_cpu(es->s_lastcheck) +
1457 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1458 printk(KERN_WARNING
1459 "EXT4-fs warning: checktime reached, "
1460 "running e2fsck is recommended\n");
1461 #if 0
1462 /* @@@ We _will_ want to clear the valid bit if we find
1463 * inconsistencies, to force a fsck at reboot. But for
1464 * a plain journaled filesystem we can keep it set as
1465 * valid forever! :)
1466 */
1467 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1468 #endif
1469 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1470 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1471 le16_add_cpu(&es->s_mnt_count, 1);
1472 es->s_mtime = cpu_to_le32(get_seconds());
1473 ext4_update_dynamic_rev(sb);
1474 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1475
1476 ext4_commit_super(sb, es, 1);
1477 if (test_opt(sb, DEBUG))
1478 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1479 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1480 sb->s_blocksize,
1481 sbi->s_groups_count,
1482 EXT4_BLOCKS_PER_GROUP(sb),
1483 EXT4_INODES_PER_GROUP(sb),
1484 sbi->s_mount_opt);
1485
1486 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1487 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1488 "external", EXT4_SB(sb)->s_journal->j_devname);
1489 return res;
1490 }
1491
1492 static int ext4_fill_flex_info(struct super_block *sb)
1493 {
1494 struct ext4_sb_info *sbi = EXT4_SB(sb);
1495 struct ext4_group_desc *gdp = NULL;
1496 struct buffer_head *bh;
1497 ext4_group_t flex_group_count;
1498 ext4_group_t flex_group;
1499 int groups_per_flex = 0;
1500 __u64 block_bitmap = 0;
1501 int i;
1502
1503 if (!sbi->s_es->s_log_groups_per_flex) {
1504 sbi->s_log_groups_per_flex = 0;
1505 return 1;
1506 }
1507
1508 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1509 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1510
1511 /* We allocate both existing and potentially added groups */
1512 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1513 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1514 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1515 groups_per_flex;
1516 sbi->s_flex_groups = kzalloc(flex_group_count *
1517 sizeof(struct flex_groups), GFP_KERNEL);
1518 if (sbi->s_flex_groups == NULL) {
1519 printk(KERN_ERR "EXT4-fs: not enough memory for "
1520 "%lu flex groups\n", flex_group_count);
1521 goto failed;
1522 }
1523
1524 gdp = ext4_get_group_desc(sb, 1, &bh);
1525 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1526
1527 for (i = 0; i < sbi->s_groups_count; i++) {
1528 gdp = ext4_get_group_desc(sb, i, &bh);
1529
1530 flex_group = ext4_flex_group(sbi, i);
1531 sbi->s_flex_groups[flex_group].free_inodes +=
1532 le16_to_cpu(gdp->bg_free_inodes_count);
1533 sbi->s_flex_groups[flex_group].free_blocks +=
1534 le16_to_cpu(gdp->bg_free_blocks_count);
1535 }
1536
1537 return 1;
1538 failed:
1539 return 0;
1540 }
1541
1542 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1543 struct ext4_group_desc *gdp)
1544 {
1545 __u16 crc = 0;
1546
1547 if (sbi->s_es->s_feature_ro_compat &
1548 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1549 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1550 __le32 le_group = cpu_to_le32(block_group);
1551
1552 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1553 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1554 crc = crc16(crc, (__u8 *)gdp, offset);
1555 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1556 /* for checksum of struct ext4_group_desc do the rest...*/
1557 if ((sbi->s_es->s_feature_incompat &
1558 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1559 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1560 crc = crc16(crc, (__u8 *)gdp + offset,
1561 le16_to_cpu(sbi->s_es->s_desc_size) -
1562 offset);
1563 }
1564
1565 return cpu_to_le16(crc);
1566 }
1567
1568 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1569 struct ext4_group_desc *gdp)
1570 {
1571 if ((sbi->s_es->s_feature_ro_compat &
1572 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1573 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1574 return 0;
1575
1576 return 1;
1577 }
1578
1579 /* Called at mount-time, super-block is locked */
1580 static int ext4_check_descriptors(struct super_block *sb)
1581 {
1582 struct ext4_sb_info *sbi = EXT4_SB(sb);
1583 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1584 ext4_fsblk_t last_block;
1585 ext4_fsblk_t block_bitmap;
1586 ext4_fsblk_t inode_bitmap;
1587 ext4_fsblk_t inode_table;
1588 int flexbg_flag = 0;
1589 ext4_group_t i;
1590
1591 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1592 flexbg_flag = 1;
1593
1594 ext4_debug("Checking group descriptors");
1595
1596 for (i = 0; i < sbi->s_groups_count; i++) {
1597 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1598
1599 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1600 last_block = ext4_blocks_count(sbi->s_es) - 1;
1601 else
1602 last_block = first_block +
1603 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1604
1605 block_bitmap = ext4_block_bitmap(sb, gdp);
1606 if (block_bitmap < first_block || block_bitmap > last_block) {
1607 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1608 "Block bitmap for group %lu not in group "
1609 "(block %llu)!", i, block_bitmap);
1610 return 0;
1611 }
1612 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1613 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1614 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1615 "Inode bitmap for group %lu not in group "
1616 "(block %llu)!", i, inode_bitmap);
1617 return 0;
1618 }
1619 inode_table = ext4_inode_table(sb, gdp);
1620 if (inode_table < first_block ||
1621 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1622 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1623 "Inode table for group %lu not in group "
1624 "(block %llu)!", i, inode_table);
1625 return 0;
1626 }
1627 spin_lock(sb_bgl_lock(sbi, i));
1628 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1629 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1630 "Checksum for group %lu failed (%u!=%u)\n",
1631 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1632 gdp)), le16_to_cpu(gdp->bg_checksum));
1633 if (!(sb->s_flags & MS_RDONLY)) {
1634 spin_unlock(sb_bgl_lock(sbi, i));
1635 return 0;
1636 }
1637 }
1638 spin_unlock(sb_bgl_lock(sbi, i));
1639 if (!flexbg_flag)
1640 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1641 }
1642
1643 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1644 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
1645 return 1;
1646 }
1647
1648 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1649 * the superblock) which were deleted from all directories, but held open by
1650 * a process at the time of a crash. We walk the list and try to delete these
1651 * inodes at recovery time (only with a read-write filesystem).
1652 *
1653 * In order to keep the orphan inode chain consistent during traversal (in
1654 * case of crash during recovery), we link each inode into the superblock
1655 * orphan list_head and handle it the same way as an inode deletion during
1656 * normal operation (which journals the operations for us).
1657 *
1658 * We only do an iget() and an iput() on each inode, which is very safe if we
1659 * accidentally point at an in-use or already deleted inode. The worst that
1660 * can happen in this case is that we get a "bit already cleared" message from
1661 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1662 * e2fsck was run on this filesystem, and it must have already done the orphan
1663 * inode cleanup for us, so we can safely abort without any further action.
1664 */
1665 static void ext4_orphan_cleanup(struct super_block *sb,
1666 struct ext4_super_block *es)
1667 {
1668 unsigned int s_flags = sb->s_flags;
1669 int nr_orphans = 0, nr_truncates = 0;
1670 #ifdef CONFIG_QUOTA
1671 int i;
1672 #endif
1673 if (!es->s_last_orphan) {
1674 jbd_debug(4, "no orphan inodes to clean up\n");
1675 return;
1676 }
1677
1678 if (bdev_read_only(sb->s_bdev)) {
1679 printk(KERN_ERR "EXT4-fs: write access "
1680 "unavailable, skipping orphan cleanup.\n");
1681 return;
1682 }
1683
1684 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1685 if (es->s_last_orphan)
1686 jbd_debug(1, "Errors on filesystem, "
1687 "clearing orphan list.\n");
1688 es->s_last_orphan = 0;
1689 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1690 return;
1691 }
1692
1693 if (s_flags & MS_RDONLY) {
1694 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1695 sb->s_id);
1696 sb->s_flags &= ~MS_RDONLY;
1697 }
1698 #ifdef CONFIG_QUOTA
1699 /* Needed for iput() to work correctly and not trash data */
1700 sb->s_flags |= MS_ACTIVE;
1701 /* Turn on quotas so that they are updated correctly */
1702 for (i = 0; i < MAXQUOTAS; i++) {
1703 if (EXT4_SB(sb)->s_qf_names[i]) {
1704 int ret = ext4_quota_on_mount(sb, i);
1705 if (ret < 0)
1706 printk(KERN_ERR
1707 "EXT4-fs: Cannot turn on journaled "
1708 "quota: error %d\n", ret);
1709 }
1710 }
1711 #endif
1712
1713 while (es->s_last_orphan) {
1714 struct inode *inode;
1715
1716 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1717 if (IS_ERR(inode)) {
1718 es->s_last_orphan = 0;
1719 break;
1720 }
1721
1722 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1723 DQUOT_INIT(inode);
1724 if (inode->i_nlink) {
1725 printk(KERN_DEBUG
1726 "%s: truncating inode %lu to %lld bytes\n",
1727 __func__, inode->i_ino, inode->i_size);
1728 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1729 inode->i_ino, inode->i_size);
1730 ext4_truncate(inode);
1731 nr_truncates++;
1732 } else {
1733 printk(KERN_DEBUG
1734 "%s: deleting unreferenced inode %lu\n",
1735 __func__, inode->i_ino);
1736 jbd_debug(2, "deleting unreferenced inode %lu\n",
1737 inode->i_ino);
1738 nr_orphans++;
1739 }
1740 iput(inode); /* The delete magic happens here! */
1741 }
1742
1743 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1744
1745 if (nr_orphans)
1746 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1747 sb->s_id, PLURAL(nr_orphans));
1748 if (nr_truncates)
1749 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1750 sb->s_id, PLURAL(nr_truncates));
1751 #ifdef CONFIG_QUOTA
1752 /* Turn quotas off */
1753 for (i = 0; i < MAXQUOTAS; i++) {
1754 if (sb_dqopt(sb)->files[i])
1755 vfs_quota_off(sb, i, 0);
1756 }
1757 #endif
1758 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1759 }
1760 /*
1761 * Maximal extent format file size.
1762 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1763 * extent format containers, within a sector_t, and within i_blocks
1764 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1765 * so that won't be a limiting factor.
1766 *
1767 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1768 */
1769 static loff_t ext4_max_size(int blkbits)
1770 {
1771 loff_t res;
1772 loff_t upper_limit = MAX_LFS_FILESIZE;
1773
1774 /* small i_blocks in vfs inode? */
1775 if (sizeof(blkcnt_t) < sizeof(u64)) {
1776 /*
1777 * CONFIG_LSF is not enabled implies the inode
1778 * i_block represent total blocks in 512 bytes
1779 * 32 == size of vfs inode i_blocks * 8
1780 */
1781 upper_limit = (1LL << 32) - 1;
1782
1783 /* total blocks in file system block size */
1784 upper_limit >>= (blkbits - 9);
1785 upper_limit <<= blkbits;
1786 }
1787
1788 /* 32-bit extent-start container, ee_block */
1789 res = 1LL << 32;
1790 res <<= blkbits;
1791 res -= 1;
1792
1793 /* Sanity check against vm- & vfs- imposed limits */
1794 if (res > upper_limit)
1795 res = upper_limit;
1796
1797 return res;
1798 }
1799
1800 /*
1801 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1802 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1803 * We need to be 1 filesystem block less than the 2^48 sector limit.
1804 */
1805 static loff_t ext4_max_bitmap_size(int bits)
1806 {
1807 loff_t res = EXT4_NDIR_BLOCKS;
1808 int meta_blocks;
1809 loff_t upper_limit;
1810 /* This is calculated to be the largest file size for a
1811 * dense, bitmapped file such that the total number of
1812 * sectors in the file, including data and all indirect blocks,
1813 * does not exceed 2^48 -1
1814 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1815 * total number of 512 bytes blocks of the file
1816 */
1817
1818 if (sizeof(blkcnt_t) < sizeof(u64)) {
1819 /*
1820 * CONFIG_LSF is not enabled implies the inode
1821 * i_block represent total blocks in 512 bytes
1822 * 32 == size of vfs inode i_blocks * 8
1823 */
1824 upper_limit = (1LL << 32) - 1;
1825
1826 /* total blocks in file system block size */
1827 upper_limit >>= (bits - 9);
1828
1829 } else {
1830 /*
1831 * We use 48 bit ext4_inode i_blocks
1832 * With EXT4_HUGE_FILE_FL set the i_blocks
1833 * represent total number of blocks in
1834 * file system block size
1835 */
1836 upper_limit = (1LL << 48) - 1;
1837
1838 }
1839
1840 /* indirect blocks */
1841 meta_blocks = 1;
1842 /* double indirect blocks */
1843 meta_blocks += 1 + (1LL << (bits-2));
1844 /* tripple indirect blocks */
1845 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1846
1847 upper_limit -= meta_blocks;
1848 upper_limit <<= bits;
1849
1850 res += 1LL << (bits-2);
1851 res += 1LL << (2*(bits-2));
1852 res += 1LL << (3*(bits-2));
1853 res <<= bits;
1854 if (res > upper_limit)
1855 res = upper_limit;
1856
1857 if (res > MAX_LFS_FILESIZE)
1858 res = MAX_LFS_FILESIZE;
1859
1860 return res;
1861 }
1862
1863 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1864 ext4_fsblk_t logical_sb_block, int nr)
1865 {
1866 struct ext4_sb_info *sbi = EXT4_SB(sb);
1867 ext4_group_t bg, first_meta_bg;
1868 int has_super = 0;
1869
1870 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1871
1872 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1873 nr < first_meta_bg)
1874 return logical_sb_block + nr + 1;
1875 bg = sbi->s_desc_per_block * nr;
1876 if (ext4_bg_has_super(sb, bg))
1877 has_super = 1;
1878 return (has_super + ext4_group_first_block_no(sb, bg));
1879 }
1880
1881 /**
1882 * ext4_get_stripe_size: Get the stripe size.
1883 * @sbi: In memory super block info
1884 *
1885 * If we have specified it via mount option, then
1886 * use the mount option value. If the value specified at mount time is
1887 * greater than the blocks per group use the super block value.
1888 * If the super block value is greater than blocks per group return 0.
1889 * Allocator needs it be less than blocks per group.
1890 *
1891 */
1892 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1893 {
1894 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1895 unsigned long stripe_width =
1896 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1897
1898 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1899 return sbi->s_stripe;
1900
1901 if (stripe_width <= sbi->s_blocks_per_group)
1902 return stripe_width;
1903
1904 if (stride <= sbi->s_blocks_per_group)
1905 return stride;
1906
1907 return 0;
1908 }
1909
1910 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
1911 __releases(kernel_lock)
1912 __acquires(kernel_lock)
1913
1914 {
1915 struct buffer_head *bh;
1916 struct ext4_super_block *es = NULL;
1917 struct ext4_sb_info *sbi;
1918 ext4_fsblk_t block;
1919 ext4_fsblk_t sb_block = get_sb_block(&data);
1920 ext4_fsblk_t logical_sb_block;
1921 unsigned long offset = 0;
1922 unsigned int journal_inum = 0;
1923 unsigned long journal_devnum = 0;
1924 unsigned long def_mount_opts;
1925 struct inode *root;
1926 char *cp;
1927 int ret = -EINVAL;
1928 int blocksize;
1929 int db_count;
1930 int i;
1931 int needs_recovery;
1932 __le32 features;
1933 __u64 blocks_count;
1934 int err;
1935
1936 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1937 if (!sbi)
1938 return -ENOMEM;
1939 sb->s_fs_info = sbi;
1940 sbi->s_mount_opt = 0;
1941 sbi->s_resuid = EXT4_DEF_RESUID;
1942 sbi->s_resgid = EXT4_DEF_RESGID;
1943 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
1944 sbi->s_sb_block = sb_block;
1945
1946 unlock_kernel();
1947
1948 /* Cleanup superblock name */
1949 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
1950 *cp = '!';
1951
1952 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1953 if (!blocksize) {
1954 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1955 goto out_fail;
1956 }
1957
1958 /*
1959 * The ext4 superblock will not be buffer aligned for other than 1kB
1960 * block sizes. We need to calculate the offset from buffer start.
1961 */
1962 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1963 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1964 offset = do_div(logical_sb_block, blocksize);
1965 } else {
1966 logical_sb_block = sb_block;
1967 }
1968
1969 if (!(bh = sb_bread(sb, logical_sb_block))) {
1970 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
1971 goto out_fail;
1972 }
1973 /*
1974 * Note: s_es must be initialized as soon as possible because
1975 * some ext4 macro-instructions depend on its value
1976 */
1977 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1978 sbi->s_es = es;
1979 sb->s_magic = le16_to_cpu(es->s_magic);
1980 if (sb->s_magic != EXT4_SUPER_MAGIC)
1981 goto cantfind_ext4;
1982
1983 /* Set defaults before we parse the mount options */
1984 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1985 if (def_mount_opts & EXT4_DEFM_DEBUG)
1986 set_opt(sbi->s_mount_opt, DEBUG);
1987 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1988 set_opt(sbi->s_mount_opt, GRPID);
1989 if (def_mount_opts & EXT4_DEFM_UID16)
1990 set_opt(sbi->s_mount_opt, NO_UID32);
1991 #ifdef CONFIG_EXT4DEV_FS_XATTR
1992 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1993 set_opt(sbi->s_mount_opt, XATTR_USER);
1994 #endif
1995 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1996 if (def_mount_opts & EXT4_DEFM_ACL)
1997 set_opt(sbi->s_mount_opt, POSIX_ACL);
1998 #endif
1999 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2000 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2001 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2002 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2003 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2004 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2005
2006 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2007 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2008 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2009 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2010 else
2011 set_opt(sbi->s_mount_opt, ERRORS_RO);
2012
2013 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2014 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2015
2016 set_opt(sbi->s_mount_opt, RESERVATION);
2017 set_opt(sbi->s_mount_opt, BARRIER);
2018
2019 /*
2020 * turn on extents feature by default in ext4 filesystem
2021 * only if feature flag already set by mkfs or tune2fs.
2022 * Use -o noextents to turn it off
2023 */
2024 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2025 set_opt(sbi->s_mount_opt, EXTENTS);
2026 else
2027 ext4_warning(sb, __func__,
2028 "extents feature not enabled on this filesystem, "
2029 "use tune2fs.\n");
2030
2031 /*
2032 * enable delayed allocation by default
2033 * Use -o nodelalloc to turn it off
2034 */
2035 set_opt(sbi->s_mount_opt, DELALLOC);
2036
2037
2038 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2039 NULL, 0))
2040 goto failed_mount;
2041
2042 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2043 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2044
2045 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2046 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2047 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2048 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2049 printk(KERN_WARNING
2050 "EXT4-fs warning: feature flags set on rev 0 fs, "
2051 "running e2fsck is recommended\n");
2052
2053 /*
2054 * Since ext4 is still considered development code, we require
2055 * that the TEST_FILESYS flag in s->flags be set.
2056 */
2057 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2058 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2059 "OK to use with test code.\n", sb->s_id);
2060 goto failed_mount;
2061 }
2062
2063 /*
2064 * Check feature flags regardless of the revision level, since we
2065 * previously didn't change the revision level when setting the flags,
2066 * so there is a chance incompat flags are set on a rev 0 filesystem.
2067 */
2068 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2069 if (features) {
2070 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2071 "unsupported optional features (%x).\n",
2072 sb->s_id, le32_to_cpu(features));
2073 goto failed_mount;
2074 }
2075 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2076 if (!(sb->s_flags & MS_RDONLY) && features) {
2077 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2078 "unsupported optional features (%x).\n",
2079 sb->s_id, le32_to_cpu(features));
2080 goto failed_mount;
2081 }
2082 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2083 /*
2084 * Large file size enabled file system can only be
2085 * mount if kernel is build with CONFIG_LSF
2086 */
2087 if (sizeof(root->i_blocks) < sizeof(u64) &&
2088 !(sb->s_flags & MS_RDONLY)) {
2089 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2090 "files cannot be mounted read-write "
2091 "without CONFIG_LSF.\n", sb->s_id);
2092 goto failed_mount;
2093 }
2094 }
2095 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2096
2097 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2098 blocksize > EXT4_MAX_BLOCK_SIZE) {
2099 printk(KERN_ERR
2100 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2101 blocksize, sb->s_id);
2102 goto failed_mount;
2103 }
2104
2105 if (sb->s_blocksize != blocksize) {
2106
2107 /* Validate the filesystem blocksize */
2108 if (!sb_set_blocksize(sb, blocksize)) {
2109 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2110 blocksize);
2111 goto failed_mount;
2112 }
2113
2114 brelse(bh);
2115 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2116 offset = do_div(logical_sb_block, blocksize);
2117 bh = sb_bread(sb, logical_sb_block);
2118 if (!bh) {
2119 printk(KERN_ERR
2120 "EXT4-fs: Can't read superblock on 2nd try.\n");
2121 goto failed_mount;
2122 }
2123 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2124 sbi->s_es = es;
2125 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2126 printk(KERN_ERR
2127 "EXT4-fs: Magic mismatch, very weird !\n");
2128 goto failed_mount;
2129 }
2130 }
2131
2132 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
2133 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
2134
2135 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2136 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2137 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2138 } else {
2139 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2140 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2141 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2142 (!is_power_of_2(sbi->s_inode_size)) ||
2143 (sbi->s_inode_size > blocksize)) {
2144 printk(KERN_ERR
2145 "EXT4-fs: unsupported inode size: %d\n",
2146 sbi->s_inode_size);
2147 goto failed_mount;
2148 }
2149 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2150 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2151 }
2152 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2153 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2154 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2155 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2156 !is_power_of_2(sbi->s_desc_size)) {
2157 printk(KERN_ERR
2158 "EXT4-fs: unsupported descriptor size %lu\n",
2159 sbi->s_desc_size);
2160 goto failed_mount;
2161 }
2162 } else
2163 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2164 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2165 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2166 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2167 goto cantfind_ext4;
2168 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2169 if (sbi->s_inodes_per_block == 0)
2170 goto cantfind_ext4;
2171 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2172 sbi->s_inodes_per_block;
2173 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2174 sbi->s_sbh = bh;
2175 sbi->s_mount_state = le16_to_cpu(es->s_state);
2176 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2177 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2178 for (i = 0; i < 4; i++)
2179 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2180 sbi->s_def_hash_version = es->s_def_hash_version;
2181
2182 if (sbi->s_blocks_per_group > blocksize * 8) {
2183 printk(KERN_ERR
2184 "EXT4-fs: #blocks per group too big: %lu\n",
2185 sbi->s_blocks_per_group);
2186 goto failed_mount;
2187 }
2188 if (sbi->s_inodes_per_group > blocksize * 8) {
2189 printk(KERN_ERR
2190 "EXT4-fs: #inodes per group too big: %lu\n",
2191 sbi->s_inodes_per_group);
2192 goto failed_mount;
2193 }
2194
2195 if (ext4_blocks_count(es) >
2196 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2197 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2198 " too large to mount safely\n", sb->s_id);
2199 if (sizeof(sector_t) < 8)
2200 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2201 "enabled\n");
2202 goto failed_mount;
2203 }
2204
2205 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2206 goto cantfind_ext4;
2207
2208 /* ensure blocks_count calculation below doesn't sign-extend */
2209 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2210 le32_to_cpu(es->s_first_data_block) + 1) {
2211 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2212 "first data block %u, blocks per group %lu\n",
2213 ext4_blocks_count(es),
2214 le32_to_cpu(es->s_first_data_block),
2215 EXT4_BLOCKS_PER_GROUP(sb));
2216 goto failed_mount;
2217 }
2218 blocks_count = (ext4_blocks_count(es) -
2219 le32_to_cpu(es->s_first_data_block) +
2220 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2221 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2222 sbi->s_groups_count = blocks_count;
2223 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2224 EXT4_DESC_PER_BLOCK(sb);
2225 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2226 GFP_KERNEL);
2227 if (sbi->s_group_desc == NULL) {
2228 printk(KERN_ERR "EXT4-fs: not enough memory\n");
2229 goto failed_mount;
2230 }
2231
2232 if (ext4_proc_root)
2233 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2234
2235 if (sbi->s_proc)
2236 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2237 &ext4_ui_proc_fops,
2238 &sbi->s_inode_readahead_blks);
2239
2240 bgl_lock_init(&sbi->s_blockgroup_lock);
2241
2242 for (i = 0; i < db_count; i++) {
2243 block = descriptor_loc(sb, logical_sb_block, i);
2244 sbi->s_group_desc[i] = sb_bread(sb, block);
2245 if (!sbi->s_group_desc[i]) {
2246 printk(KERN_ERR "EXT4-fs: "
2247 "can't read group descriptor %d\n", i);
2248 db_count = i;
2249 goto failed_mount2;
2250 }
2251 }
2252 if (!ext4_check_descriptors(sb)) {
2253 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2254 goto failed_mount2;
2255 }
2256 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2257 if (!ext4_fill_flex_info(sb)) {
2258 printk(KERN_ERR
2259 "EXT4-fs: unable to initialize "
2260 "flex_bg meta info!\n");
2261 goto failed_mount2;
2262 }
2263
2264 sbi->s_gdb_count = db_count;
2265 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2266 spin_lock_init(&sbi->s_next_gen_lock);
2267
2268 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2269 ext4_count_free_blocks(sb));
2270 if (!err) {
2271 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2272 ext4_count_free_inodes(sb));
2273 }
2274 if (!err) {
2275 err = percpu_counter_init(&sbi->s_dirs_counter,
2276 ext4_count_dirs(sb));
2277 }
2278 if (!err) {
2279 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2280 }
2281 if (err) {
2282 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2283 goto failed_mount3;
2284 }
2285
2286 sbi->s_stripe = ext4_get_stripe_size(sbi);
2287
2288 /*
2289 * set up enough so that it can read an inode
2290 */
2291 sb->s_op = &ext4_sops;
2292 sb->s_export_op = &ext4_export_ops;
2293 sb->s_xattr = ext4_xattr_handlers;
2294 #ifdef CONFIG_QUOTA
2295 sb->s_qcop = &ext4_qctl_operations;
2296 sb->dq_op = &ext4_quota_operations;
2297 #endif
2298 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2299
2300 sb->s_root = NULL;
2301
2302 needs_recovery = (es->s_last_orphan != 0 ||
2303 EXT4_HAS_INCOMPAT_FEATURE(sb,
2304 EXT4_FEATURE_INCOMPAT_RECOVER));
2305
2306 /*
2307 * The first inode we look at is the journal inode. Don't try
2308 * root first: it may be modified in the journal!
2309 */
2310 if (!test_opt(sb, NOLOAD) &&
2311 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2312 if (ext4_load_journal(sb, es, journal_devnum))
2313 goto failed_mount3;
2314 if (!(sb->s_flags & MS_RDONLY) &&
2315 EXT4_SB(sb)->s_journal->j_failed_commit) {
2316 printk(KERN_CRIT "EXT4-fs error (device %s): "
2317 "ext4_fill_super: Journal transaction "
2318 "%u is corrupt\n", sb->s_id,
2319 EXT4_SB(sb)->s_journal->j_failed_commit);
2320 if (test_opt(sb, ERRORS_RO)) {
2321 printk(KERN_CRIT
2322 "Mounting filesystem read-only\n");
2323 sb->s_flags |= MS_RDONLY;
2324 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2325 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2326 }
2327 if (test_opt(sb, ERRORS_PANIC)) {
2328 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2329 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2330 ext4_commit_super(sb, es, 1);
2331 printk(KERN_CRIT
2332 "EXT4-fs (device %s): mount failed\n",
2333 sb->s_id);
2334 goto failed_mount4;
2335 }
2336 }
2337 } else if (journal_inum) {
2338 if (ext4_create_journal(sb, es, journal_inum))
2339 goto failed_mount3;
2340 } else {
2341 if (!silent)
2342 printk(KERN_ERR
2343 "ext4: No journal on filesystem on %s\n",
2344 sb->s_id);
2345 goto failed_mount3;
2346 }
2347
2348 if (ext4_blocks_count(es) > 0xffffffffULL &&
2349 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2350 JBD2_FEATURE_INCOMPAT_64BIT)) {
2351 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2352 goto failed_mount4;
2353 }
2354
2355 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2356 jbd2_journal_set_features(sbi->s_journal,
2357 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2358 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2359 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2360 jbd2_journal_set_features(sbi->s_journal,
2361 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2362 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2363 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2364 } else {
2365 jbd2_journal_clear_features(sbi->s_journal,
2366 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2367 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2368 }
2369
2370 /* We have now updated the journal if required, so we can
2371 * validate the data journaling mode. */
2372 switch (test_opt(sb, DATA_FLAGS)) {
2373 case 0:
2374 /* No mode set, assume a default based on the journal
2375 * capabilities: ORDERED_DATA if the journal can
2376 * cope, else JOURNAL_DATA
2377 */
2378 if (jbd2_journal_check_available_features
2379 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2380 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2381 else
2382 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2383 break;
2384
2385 case EXT4_MOUNT_ORDERED_DATA:
2386 case EXT4_MOUNT_WRITEBACK_DATA:
2387 if (!jbd2_journal_check_available_features
2388 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2389 printk(KERN_ERR "EXT4-fs: Journal does not support "
2390 "requested data journaling mode\n");
2391 goto failed_mount4;
2392 }
2393 default:
2394 break;
2395 }
2396
2397 if (test_opt(sb, NOBH)) {
2398 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2399 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2400 "its supported only with writeback mode\n");
2401 clear_opt(sbi->s_mount_opt, NOBH);
2402 }
2403 }
2404 /*
2405 * The jbd2_journal_load will have done any necessary log recovery,
2406 * so we can safely mount the rest of the filesystem now.
2407 */
2408
2409 root = ext4_iget(sb, EXT4_ROOT_INO);
2410 if (IS_ERR(root)) {
2411 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2412 ret = PTR_ERR(root);
2413 goto failed_mount4;
2414 }
2415 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2416 iput(root);
2417 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2418 goto failed_mount4;
2419 }
2420 sb->s_root = d_alloc_root(root);
2421 if (!sb->s_root) {
2422 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2423 iput(root);
2424 ret = -ENOMEM;
2425 goto failed_mount4;
2426 }
2427
2428 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2429
2430 /* determine the minimum size of new large inodes, if present */
2431 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2432 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2433 EXT4_GOOD_OLD_INODE_SIZE;
2434 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2435 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2436 if (sbi->s_want_extra_isize <
2437 le16_to_cpu(es->s_want_extra_isize))
2438 sbi->s_want_extra_isize =
2439 le16_to_cpu(es->s_want_extra_isize);
2440 if (sbi->s_want_extra_isize <
2441 le16_to_cpu(es->s_min_extra_isize))
2442 sbi->s_want_extra_isize =
2443 le16_to_cpu(es->s_min_extra_isize);
2444 }
2445 }
2446 /* Check if enough inode space is available */
2447 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2448 sbi->s_inode_size) {
2449 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2450 EXT4_GOOD_OLD_INODE_SIZE;
2451 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2452 "available.\n");
2453 }
2454
2455 /*
2456 * akpm: core read_super() calls in here with the superblock locked.
2457 * That deadlocks, because orphan cleanup needs to lock the superblock
2458 * in numerous places. Here we just pop the lock - it's relatively
2459 * harmless, because we are now ready to accept write_super() requests,
2460 * and aviro says that's the only reason for hanging onto the
2461 * superblock lock.
2462 */
2463 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2464 ext4_orphan_cleanup(sb, es);
2465 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2466 if (needs_recovery)
2467 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
2468 ext4_mark_recovery_complete(sb, es);
2469 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2470 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2471 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2472 "writeback");
2473
2474 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2475 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2476 "requested data journaling mode\n");
2477 clear_opt(sbi->s_mount_opt, DELALLOC);
2478 } else if (test_opt(sb, DELALLOC))
2479 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2480
2481 ext4_ext_init(sb);
2482 err = ext4_mb_init(sb, needs_recovery);
2483 if (err) {
2484 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2485 err);
2486 goto failed_mount4;
2487 }
2488
2489 lock_kernel();
2490 return 0;
2491
2492 cantfind_ext4:
2493 if (!silent)
2494 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2495 sb->s_id);
2496 goto failed_mount;
2497
2498 failed_mount4:
2499 jbd2_journal_destroy(sbi->s_journal);
2500 sbi->s_journal = NULL;
2501 failed_mount3:
2502 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2503 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2504 percpu_counter_destroy(&sbi->s_dirs_counter);
2505 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2506 failed_mount2:
2507 for (i = 0; i < db_count; i++)
2508 brelse(sbi->s_group_desc[i]);
2509 kfree(sbi->s_group_desc);
2510 failed_mount:
2511 if (sbi->s_proc) {
2512 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
2513 remove_proc_entry(sb->s_id, ext4_proc_root);
2514 }
2515 #ifdef CONFIG_QUOTA
2516 for (i = 0; i < MAXQUOTAS; i++)
2517 kfree(sbi->s_qf_names[i]);
2518 #endif
2519 ext4_blkdev_remove(sbi);
2520 brelse(bh);
2521 out_fail:
2522 sb->s_fs_info = NULL;
2523 kfree(sbi);
2524 lock_kernel();
2525 return ret;
2526 }
2527
2528 /*
2529 * Setup any per-fs journal parameters now. We'll do this both on
2530 * initial mount, once the journal has been initialised but before we've
2531 * done any recovery; and again on any subsequent remount.
2532 */
2533 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2534 {
2535 struct ext4_sb_info *sbi = EXT4_SB(sb);
2536
2537 if (sbi->s_commit_interval)
2538 journal->j_commit_interval = sbi->s_commit_interval;
2539 /* We could also set up an ext4-specific default for the commit
2540 * interval here, but for now we'll just fall back to the jbd
2541 * default. */
2542
2543 spin_lock(&journal->j_state_lock);
2544 if (test_opt(sb, BARRIER))
2545 journal->j_flags |= JBD2_BARRIER;
2546 else
2547 journal->j_flags &= ~JBD2_BARRIER;
2548 spin_unlock(&journal->j_state_lock);
2549 }
2550
2551 static journal_t *ext4_get_journal(struct super_block *sb,
2552 unsigned int journal_inum)
2553 {
2554 struct inode *journal_inode;
2555 journal_t *journal;
2556
2557 /* First, test for the existence of a valid inode on disk. Bad
2558 * things happen if we iget() an unused inode, as the subsequent
2559 * iput() will try to delete it. */
2560
2561 journal_inode = ext4_iget(sb, journal_inum);
2562 if (IS_ERR(journal_inode)) {
2563 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2564 return NULL;
2565 }
2566 if (!journal_inode->i_nlink) {
2567 make_bad_inode(journal_inode);
2568 iput(journal_inode);
2569 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2570 return NULL;
2571 }
2572
2573 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2574 journal_inode, journal_inode->i_size);
2575 if (!S_ISREG(journal_inode->i_mode)) {
2576 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2577 iput(journal_inode);
2578 return NULL;
2579 }
2580
2581 journal = jbd2_journal_init_inode(journal_inode);
2582 if (!journal) {
2583 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2584 iput(journal_inode);
2585 return NULL;
2586 }
2587 journal->j_private = sb;
2588 ext4_init_journal_params(sb, journal);
2589 return journal;
2590 }
2591
2592 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2593 dev_t j_dev)
2594 {
2595 struct buffer_head *bh;
2596 journal_t *journal;
2597 ext4_fsblk_t start;
2598 ext4_fsblk_t len;
2599 int hblock, blocksize;
2600 ext4_fsblk_t sb_block;
2601 unsigned long offset;
2602 struct ext4_super_block *es;
2603 struct block_device *bdev;
2604
2605 bdev = ext4_blkdev_get(j_dev);
2606 if (bdev == NULL)
2607 return NULL;
2608
2609 if (bd_claim(bdev, sb)) {
2610 printk(KERN_ERR
2611 "EXT4: failed to claim external journal device.\n");
2612 blkdev_put(bdev);
2613 return NULL;
2614 }
2615
2616 blocksize = sb->s_blocksize;
2617 hblock = bdev_hardsect_size(bdev);
2618 if (blocksize < hblock) {
2619 printk(KERN_ERR
2620 "EXT4-fs: blocksize too small for journal device.\n");
2621 goto out_bdev;
2622 }
2623
2624 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2625 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2626 set_blocksize(bdev, blocksize);
2627 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2628 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2629 "external journal\n");
2630 goto out_bdev;
2631 }
2632
2633 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2634 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2635 !(le32_to_cpu(es->s_feature_incompat) &
2636 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2637 printk(KERN_ERR "EXT4-fs: external journal has "
2638 "bad superblock\n");
2639 brelse(bh);
2640 goto out_bdev;
2641 }
2642
2643 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2644 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2645 brelse(bh);
2646 goto out_bdev;
2647 }
2648
2649 len = ext4_blocks_count(es);
2650 start = sb_block + 1;
2651 brelse(bh); /* we're done with the superblock */
2652
2653 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2654 start, len, blocksize);
2655 if (!journal) {
2656 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2657 goto out_bdev;
2658 }
2659 journal->j_private = sb;
2660 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2661 wait_on_buffer(journal->j_sb_buffer);
2662 if (!buffer_uptodate(journal->j_sb_buffer)) {
2663 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2664 goto out_journal;
2665 }
2666 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2667 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2668 "user (unsupported) - %d\n",
2669 be32_to_cpu(journal->j_superblock->s_nr_users));
2670 goto out_journal;
2671 }
2672 EXT4_SB(sb)->journal_bdev = bdev;
2673 ext4_init_journal_params(sb, journal);
2674 return journal;
2675 out_journal:
2676 jbd2_journal_destroy(journal);
2677 out_bdev:
2678 ext4_blkdev_put(bdev);
2679 return NULL;
2680 }
2681
2682 static int ext4_load_journal(struct super_block *sb,
2683 struct ext4_super_block *es,
2684 unsigned long journal_devnum)
2685 {
2686 journal_t *journal;
2687 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2688 dev_t journal_dev;
2689 int err = 0;
2690 int really_read_only;
2691
2692 if (journal_devnum &&
2693 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2694 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2695 "numbers have changed\n");
2696 journal_dev = new_decode_dev(journal_devnum);
2697 } else
2698 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2699
2700 really_read_only = bdev_read_only(sb->s_bdev);
2701
2702 /*
2703 * Are we loading a blank journal or performing recovery after a
2704 * crash? For recovery, we need to check in advance whether we
2705 * can get read-write access to the device.
2706 */
2707
2708 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2709 if (sb->s_flags & MS_RDONLY) {
2710 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2711 "required on readonly filesystem.\n");
2712 if (really_read_only) {
2713 printk(KERN_ERR "EXT4-fs: write access "
2714 "unavailable, cannot proceed.\n");
2715 return -EROFS;
2716 }
2717 printk(KERN_INFO "EXT4-fs: write access will "
2718 "be enabled during recovery.\n");
2719 }
2720 }
2721
2722 if (journal_inum && journal_dev) {
2723 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2724 "and inode journals!\n");
2725 return -EINVAL;
2726 }
2727
2728 if (journal_inum) {
2729 if (!(journal = ext4_get_journal(sb, journal_inum)))
2730 return -EINVAL;
2731 } else {
2732 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2733 return -EINVAL;
2734 }
2735
2736 if (journal->j_flags & JBD2_BARRIER)
2737 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2738 else
2739 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2740
2741 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2742 err = jbd2_journal_update_format(journal);
2743 if (err) {
2744 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2745 jbd2_journal_destroy(journal);
2746 return err;
2747 }
2748 }
2749
2750 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2751 err = jbd2_journal_wipe(journal, !really_read_only);
2752 if (!err)
2753 err = jbd2_journal_load(journal);
2754
2755 if (err) {
2756 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2757 jbd2_journal_destroy(journal);
2758 return err;
2759 }
2760
2761 EXT4_SB(sb)->s_journal = journal;
2762 ext4_clear_journal_err(sb, es);
2763
2764 if (journal_devnum &&
2765 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2766 es->s_journal_dev = cpu_to_le32(journal_devnum);
2767 sb->s_dirt = 1;
2768
2769 /* Make sure we flush the recovery flag to disk. */
2770 ext4_commit_super(sb, es, 1);
2771 }
2772
2773 return 0;
2774 }
2775
2776 static int ext4_create_journal(struct super_block *sb,
2777 struct ext4_super_block *es,
2778 unsigned int journal_inum)
2779 {
2780 journal_t *journal;
2781 int err;
2782
2783 if (sb->s_flags & MS_RDONLY) {
2784 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2785 "create journal.\n");
2786 return -EROFS;
2787 }
2788
2789 journal = ext4_get_journal(sb, journal_inum);
2790 if (!journal)
2791 return -EINVAL;
2792
2793 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2794 journal_inum);
2795
2796 err = jbd2_journal_create(journal);
2797 if (err) {
2798 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2799 jbd2_journal_destroy(journal);
2800 return -EIO;
2801 }
2802
2803 EXT4_SB(sb)->s_journal = journal;
2804
2805 ext4_update_dynamic_rev(sb);
2806 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2807 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2808
2809 es->s_journal_inum = cpu_to_le32(journal_inum);
2810 sb->s_dirt = 1;
2811
2812 /* Make sure we flush the recovery flag to disk. */
2813 ext4_commit_super(sb, es, 1);
2814
2815 return 0;
2816 }
2817
2818 static void ext4_commit_super(struct super_block *sb,
2819 struct ext4_super_block *es, int sync)
2820 {
2821 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2822
2823 if (!sbh)
2824 return;
2825 if (buffer_write_io_error(sbh)) {
2826 /*
2827 * Oh, dear. A previous attempt to write the
2828 * superblock failed. This could happen because the
2829 * USB device was yanked out. Or it could happen to
2830 * be a transient write error and maybe the block will
2831 * be remapped. Nothing we can do but to retry the
2832 * write and hope for the best.
2833 */
2834 printk(KERN_ERR "ext4: previous I/O error to "
2835 "superblock detected for %s.\n", sb->s_id);
2836 clear_buffer_write_io_error(sbh);
2837 set_buffer_uptodate(sbh);
2838 }
2839 es->s_wtime = cpu_to_le32(get_seconds());
2840 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2841 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2842 BUFFER_TRACE(sbh, "marking dirty");
2843 mark_buffer_dirty(sbh);
2844 if (sync) {
2845 sync_dirty_buffer(sbh);
2846 if (buffer_write_io_error(sbh)) {
2847 printk(KERN_ERR "ext4: I/O error while writing "
2848 "superblock for %s.\n", sb->s_id);
2849 clear_buffer_write_io_error(sbh);
2850 set_buffer_uptodate(sbh);
2851 }
2852 }
2853 }
2854
2855
2856 /*
2857 * Have we just finished recovery? If so, and if we are mounting (or
2858 * remounting) the filesystem readonly, then we will end up with a
2859 * consistent fs on disk. Record that fact.
2860 */
2861 static void ext4_mark_recovery_complete(struct super_block *sb,
2862 struct ext4_super_block *es)
2863 {
2864 journal_t *journal = EXT4_SB(sb)->s_journal;
2865
2866 jbd2_journal_lock_updates(journal);
2867 jbd2_journal_flush(journal);
2868 lock_super(sb);
2869 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2870 sb->s_flags & MS_RDONLY) {
2871 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2872 sb->s_dirt = 0;
2873 ext4_commit_super(sb, es, 1);
2874 }
2875 unlock_super(sb);
2876 jbd2_journal_unlock_updates(journal);
2877 }
2878
2879 /*
2880 * If we are mounting (or read-write remounting) a filesystem whose journal
2881 * has recorded an error from a previous lifetime, move that error to the
2882 * main filesystem now.
2883 */
2884 static void ext4_clear_journal_err(struct super_block *sb,
2885 struct ext4_super_block *es)
2886 {
2887 journal_t *journal;
2888 int j_errno;
2889 const char *errstr;
2890
2891 journal = EXT4_SB(sb)->s_journal;
2892
2893 /*
2894 * Now check for any error status which may have been recorded in the
2895 * journal by a prior ext4_error() or ext4_abort()
2896 */
2897
2898 j_errno = jbd2_journal_errno(journal);
2899 if (j_errno) {
2900 char nbuf[16];
2901
2902 errstr = ext4_decode_error(sb, j_errno, nbuf);
2903 ext4_warning(sb, __func__, "Filesystem error recorded "
2904 "from previous mount: %s", errstr);
2905 ext4_warning(sb, __func__, "Marking fs in need of "
2906 "filesystem check.");
2907
2908 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2909 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2910 ext4_commit_super(sb, es, 1);
2911
2912 jbd2_journal_clear_err(journal);
2913 }
2914 }
2915
2916 /*
2917 * Force the running and committing transactions to commit,
2918 * and wait on the commit.
2919 */
2920 int ext4_force_commit(struct super_block *sb)
2921 {
2922 journal_t *journal;
2923 int ret;
2924
2925 if (sb->s_flags & MS_RDONLY)
2926 return 0;
2927
2928 journal = EXT4_SB(sb)->s_journal;
2929 sb->s_dirt = 0;
2930 ret = ext4_journal_force_commit(journal);
2931 return ret;
2932 }
2933
2934 /*
2935 * Ext4 always journals updates to the superblock itself, so we don't
2936 * have to propagate any other updates to the superblock on disk at this
2937 * point. Just start an async writeback to get the buffers on their way
2938 * to the disk.
2939 *
2940 * This implicitly triggers the writebehind on sync().
2941 */
2942
2943 static void ext4_write_super(struct super_block *sb)
2944 {
2945 if (mutex_trylock(&sb->s_lock) != 0)
2946 BUG();
2947 sb->s_dirt = 0;
2948 }
2949
2950 static int ext4_sync_fs(struct super_block *sb, int wait)
2951 {
2952 tid_t target;
2953
2954 sb->s_dirt = 0;
2955 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2956 if (wait)
2957 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2958 }
2959 return 0;
2960 }
2961
2962 /*
2963 * LVM calls this function before a (read-only) snapshot is created. This
2964 * gives us a chance to flush the journal completely and mark the fs clean.
2965 */
2966 static void ext4_write_super_lockfs(struct super_block *sb)
2967 {
2968 sb->s_dirt = 0;
2969
2970 if (!(sb->s_flags & MS_RDONLY)) {
2971 journal_t *journal = EXT4_SB(sb)->s_journal;
2972
2973 /* Now we set up the journal barrier. */
2974 jbd2_journal_lock_updates(journal);
2975 jbd2_journal_flush(journal);
2976
2977 /* Journal blocked and flushed, clear needs_recovery flag. */
2978 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2979 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2980 }
2981 }
2982
2983 /*
2984 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2985 * flag here, even though the filesystem is not technically dirty yet.
2986 */
2987 static void ext4_unlockfs(struct super_block *sb)
2988 {
2989 if (!(sb->s_flags & MS_RDONLY)) {
2990 lock_super(sb);
2991 /* Reser the needs_recovery flag before the fs is unlocked. */
2992 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2993 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2994 unlock_super(sb);
2995 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2996 }
2997 }
2998
2999 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3000 {
3001 struct ext4_super_block *es;
3002 struct ext4_sb_info *sbi = EXT4_SB(sb);
3003 ext4_fsblk_t n_blocks_count = 0;
3004 unsigned long old_sb_flags;
3005 struct ext4_mount_options old_opts;
3006 ext4_group_t g;
3007 int err;
3008 #ifdef CONFIG_QUOTA
3009 int i;
3010 #endif
3011
3012 /* Store the original options */
3013 old_sb_flags = sb->s_flags;
3014 old_opts.s_mount_opt = sbi->s_mount_opt;
3015 old_opts.s_resuid = sbi->s_resuid;
3016 old_opts.s_resgid = sbi->s_resgid;
3017 old_opts.s_commit_interval = sbi->s_commit_interval;
3018 #ifdef CONFIG_QUOTA
3019 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3020 for (i = 0; i < MAXQUOTAS; i++)
3021 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3022 #endif
3023
3024 /*
3025 * Allow the "check" option to be passed as a remount option.
3026 */
3027 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
3028 err = -EINVAL;
3029 goto restore_opts;
3030 }
3031
3032 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
3033 ext4_abort(sb, __func__, "Abort forced by user");
3034
3035 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3036 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
3037
3038 es = sbi->s_es;
3039
3040 ext4_init_journal_params(sb, sbi->s_journal);
3041
3042 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3043 n_blocks_count > ext4_blocks_count(es)) {
3044 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
3045 err = -EROFS;
3046 goto restore_opts;
3047 }
3048
3049 if (*flags & MS_RDONLY) {
3050 /*
3051 * First of all, the unconditional stuff we have to do
3052 * to disable replay of the journal when we next remount
3053 */
3054 sb->s_flags |= MS_RDONLY;
3055
3056 /*
3057 * OK, test if we are remounting a valid rw partition
3058 * readonly, and if so set the rdonly flag and then
3059 * mark the partition as valid again.
3060 */
3061 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3062 (sbi->s_mount_state & EXT4_VALID_FS))
3063 es->s_state = cpu_to_le16(sbi->s_mount_state);
3064
3065 /*
3066 * We have to unlock super so that we can wait for
3067 * transactions.
3068 */
3069 unlock_super(sb);
3070 ext4_mark_recovery_complete(sb, es);
3071 lock_super(sb);
3072 } else {
3073 __le32 ret;
3074 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3075 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3076 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3077 "remount RDWR because of unsupported "
3078 "optional features (%x).\n",
3079 sb->s_id, le32_to_cpu(ret));
3080 err = -EROFS;
3081 goto restore_opts;
3082 }
3083
3084 /*
3085 * Make sure the group descriptor checksums
3086 * are sane. If they aren't, refuse to
3087 * remount r/w.
3088 */
3089 for (g = 0; g < sbi->s_groups_count; g++) {
3090 struct ext4_group_desc *gdp =
3091 ext4_get_group_desc(sb, g, NULL);
3092
3093 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3094 printk(KERN_ERR
3095 "EXT4-fs: ext4_remount: "
3096 "Checksum for group %lu failed (%u!=%u)\n",
3097 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3098 le16_to_cpu(gdp->bg_checksum));
3099 err = -EINVAL;
3100 goto restore_opts;
3101 }
3102 }
3103
3104 /*
3105 * If we have an unprocessed orphan list hanging
3106 * around from a previously readonly bdev mount,
3107 * require a full umount/remount for now.
3108 */
3109 if (es->s_last_orphan) {
3110 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3111 "remount RDWR because of unprocessed "
3112 "orphan inode list. Please "
3113 "umount/remount instead.\n",
3114 sb->s_id);
3115 err = -EINVAL;
3116 goto restore_opts;
3117 }
3118
3119 /*
3120 * Mounting a RDONLY partition read-write, so reread
3121 * and store the current valid flag. (It may have
3122 * been changed by e2fsck since we originally mounted
3123 * the partition.)
3124 */
3125 ext4_clear_journal_err(sb, es);
3126 sbi->s_mount_state = le16_to_cpu(es->s_state);
3127 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3128 goto restore_opts;
3129 if (!ext4_setup_super(sb, es, 0))
3130 sb->s_flags &= ~MS_RDONLY;
3131 }
3132 }
3133 #ifdef CONFIG_QUOTA
3134 /* Release old quota file names */
3135 for (i = 0; i < MAXQUOTAS; i++)
3136 if (old_opts.s_qf_names[i] &&
3137 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3138 kfree(old_opts.s_qf_names[i]);
3139 #endif
3140 return 0;
3141 restore_opts:
3142 sb->s_flags = old_sb_flags;
3143 sbi->s_mount_opt = old_opts.s_mount_opt;
3144 sbi->s_resuid = old_opts.s_resuid;
3145 sbi->s_resgid = old_opts.s_resgid;
3146 sbi->s_commit_interval = old_opts.s_commit_interval;
3147 #ifdef CONFIG_QUOTA
3148 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3149 for (i = 0; i < MAXQUOTAS; i++) {
3150 if (sbi->s_qf_names[i] &&
3151 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3152 kfree(sbi->s_qf_names[i]);
3153 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3154 }
3155 #endif
3156 return err;
3157 }
3158
3159 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3160 {
3161 struct super_block *sb = dentry->d_sb;
3162 struct ext4_sb_info *sbi = EXT4_SB(sb);
3163 struct ext4_super_block *es = sbi->s_es;
3164 u64 fsid;
3165
3166 if (test_opt(sb, MINIX_DF)) {
3167 sbi->s_overhead_last = 0;
3168 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3169 ext4_group_t ngroups = sbi->s_groups_count, i;
3170 ext4_fsblk_t overhead = 0;
3171 smp_rmb();
3172
3173 /*
3174 * Compute the overhead (FS structures). This is constant
3175 * for a given filesystem unless the number of block groups
3176 * changes so we cache the previous value until it does.
3177 */
3178
3179 /*
3180 * All of the blocks before first_data_block are
3181 * overhead
3182 */
3183 overhead = le32_to_cpu(es->s_first_data_block);
3184
3185 /*
3186 * Add the overhead attributed to the superblock and
3187 * block group descriptors. If the sparse superblocks
3188 * feature is turned on, then not all groups have this.
3189 */
3190 for (i = 0; i < ngroups; i++) {
3191 overhead += ext4_bg_has_super(sb, i) +
3192 ext4_bg_num_gdb(sb, i);
3193 cond_resched();
3194 }
3195
3196 /*
3197 * Every block group has an inode bitmap, a block
3198 * bitmap, and an inode table.
3199 */
3200 overhead += ngroups * (2 + sbi->s_itb_per_group);
3201 sbi->s_overhead_last = overhead;
3202 smp_wmb();
3203 sbi->s_blocks_last = ext4_blocks_count(es);
3204 }
3205
3206 buf->f_type = EXT4_SUPER_MAGIC;
3207 buf->f_bsize = sb->s_blocksize;
3208 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3209 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3210 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3211 ext4_free_blocks_count_set(es, buf->f_bfree);
3212 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3213 if (buf->f_bfree < ext4_r_blocks_count(es))
3214 buf->f_bavail = 0;
3215 buf->f_files = le32_to_cpu(es->s_inodes_count);
3216 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3217 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3218 buf->f_namelen = EXT4_NAME_LEN;
3219 fsid = le64_to_cpup((void *)es->s_uuid) ^
3220 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3221 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3222 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3223 return 0;
3224 }
3225
3226 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3227 * is locked for write. Otherwise the are possible deadlocks:
3228 * Process 1 Process 2
3229 * ext4_create() quota_sync()
3230 * jbd2_journal_start() write_dquot()
3231 * DQUOT_INIT() down(dqio_mutex)
3232 * down(dqio_mutex) jbd2_journal_start()
3233 *
3234 */
3235
3236 #ifdef CONFIG_QUOTA
3237
3238 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3239 {
3240 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3241 }
3242
3243 static int ext4_dquot_initialize(struct inode *inode, int type)
3244 {
3245 handle_t *handle;
3246 int ret, err;
3247
3248 /* We may create quota structure so we need to reserve enough blocks */
3249 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3250 if (IS_ERR(handle))
3251 return PTR_ERR(handle);
3252 ret = dquot_initialize(inode, type);
3253 err = ext4_journal_stop(handle);
3254 if (!ret)
3255 ret = err;
3256 return ret;
3257 }
3258
3259 static int ext4_dquot_drop(struct inode *inode)
3260 {
3261 handle_t *handle;
3262 int ret, err;
3263
3264 /* We may delete quota structure so we need to reserve enough blocks */
3265 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3266 if (IS_ERR(handle)) {
3267 /*
3268 * We call dquot_drop() anyway to at least release references
3269 * to quota structures so that umount does not hang.
3270 */
3271 dquot_drop(inode);
3272 return PTR_ERR(handle);
3273 }
3274 ret = dquot_drop(inode);
3275 err = ext4_journal_stop(handle);
3276 if (!ret)
3277 ret = err;
3278 return ret;
3279 }
3280
3281 static int ext4_write_dquot(struct dquot *dquot)
3282 {
3283 int ret, err;
3284 handle_t *handle;
3285 struct inode *inode;
3286
3287 inode = dquot_to_inode(dquot);
3288 handle = ext4_journal_start(inode,
3289 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3290 if (IS_ERR(handle))
3291 return PTR_ERR(handle);
3292 ret = dquot_commit(dquot);
3293 err = ext4_journal_stop(handle);
3294 if (!ret)
3295 ret = err;
3296 return ret;
3297 }
3298
3299 static int ext4_acquire_dquot(struct dquot *dquot)
3300 {
3301 int ret, err;
3302 handle_t *handle;
3303
3304 handle = ext4_journal_start(dquot_to_inode(dquot),
3305 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3306 if (IS_ERR(handle))
3307 return PTR_ERR(handle);
3308 ret = dquot_acquire(dquot);
3309 err = ext4_journal_stop(handle);
3310 if (!ret)
3311 ret = err;
3312 return ret;
3313 }
3314
3315 static int ext4_release_dquot(struct dquot *dquot)
3316 {
3317 int ret, err;
3318 handle_t *handle;
3319
3320 handle = ext4_journal_start(dquot_to_inode(dquot),
3321 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3322 if (IS_ERR(handle)) {
3323 /* Release dquot anyway to avoid endless cycle in dqput() */
3324 dquot_release(dquot);
3325 return PTR_ERR(handle);
3326 }
3327 ret = dquot_release(dquot);
3328 err = ext4_journal_stop(handle);
3329 if (!ret)
3330 ret = err;
3331 return ret;
3332 }
3333
3334 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3335 {
3336 /* Are we journaling quotas? */
3337 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3338 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3339 dquot_mark_dquot_dirty(dquot);
3340 return ext4_write_dquot(dquot);
3341 } else {
3342 return dquot_mark_dquot_dirty(dquot);
3343 }
3344 }
3345
3346 static int ext4_write_info(struct super_block *sb, int type)
3347 {
3348 int ret, err;
3349 handle_t *handle;
3350
3351 /* Data block + inode block */
3352 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3353 if (IS_ERR(handle))
3354 return PTR_ERR(handle);
3355 ret = dquot_commit_info(sb, type);
3356 err = ext4_journal_stop(handle);
3357 if (!ret)
3358 ret = err;
3359 return ret;
3360 }
3361
3362 /*
3363 * Turn on quotas during mount time - we need to find
3364 * the quota file and such...
3365 */
3366 static int ext4_quota_on_mount(struct super_block *sb, int type)
3367 {
3368 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3369 EXT4_SB(sb)->s_jquota_fmt, type);
3370 }
3371
3372 /*
3373 * Standard function to be called on quota_on
3374 */
3375 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3376 char *path, int remount)
3377 {
3378 int err;
3379 struct nameidata nd;
3380
3381 if (!test_opt(sb, QUOTA))
3382 return -EINVAL;
3383 /* When remounting, no checks are needed and in fact, path is NULL */
3384 if (remount)
3385 return vfs_quota_on(sb, type, format_id, path, remount);
3386
3387 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3388 if (err)
3389 return err;
3390
3391 /* Quotafile not on the same filesystem? */
3392 if (nd.path.mnt->mnt_sb != sb) {
3393 path_put(&nd.path);
3394 return -EXDEV;
3395 }
3396 /* Journaling quota? */
3397 if (EXT4_SB(sb)->s_qf_names[type]) {
3398 /* Quotafile not in fs root? */
3399 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3400 printk(KERN_WARNING
3401 "EXT4-fs: Quota file not on filesystem root. "
3402 "Journaled quota will not work.\n");
3403 }
3404
3405 /*
3406 * When we journal data on quota file, we have to flush journal to see
3407 * all updates to the file when we bypass pagecache...
3408 */
3409 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3410 /*
3411 * We don't need to lock updates but journal_flush() could
3412 * otherwise be livelocked...
3413 */
3414 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3415 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3416 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3417 }
3418
3419 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
3420 path_put(&nd.path);
3421 return err;
3422 }
3423
3424 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3425 * acquiring the locks... As quota files are never truncated and quota code
3426 * itself serializes the operations (and noone else should touch the files)
3427 * we don't have to be afraid of races */
3428 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3429 size_t len, loff_t off)
3430 {
3431 struct inode *inode = sb_dqopt(sb)->files[type];
3432 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3433 int err = 0;
3434 int offset = off & (sb->s_blocksize - 1);
3435 int tocopy;
3436 size_t toread;
3437 struct buffer_head *bh;
3438 loff_t i_size = i_size_read(inode);
3439
3440 if (off > i_size)
3441 return 0;
3442 if (off+len > i_size)
3443 len = i_size-off;
3444 toread = len;
3445 while (toread > 0) {
3446 tocopy = sb->s_blocksize - offset < toread ?
3447 sb->s_blocksize - offset : toread;
3448 bh = ext4_bread(NULL, inode, blk, 0, &err);
3449 if (err)
3450 return err;
3451 if (!bh) /* A hole? */
3452 memset(data, 0, tocopy);
3453 else
3454 memcpy(data, bh->b_data+offset, tocopy);
3455 brelse(bh);
3456 offset = 0;
3457 toread -= tocopy;
3458 data += tocopy;
3459 blk++;
3460 }
3461 return len;
3462 }
3463
3464 /* Write to quotafile (we know the transaction is already started and has
3465 * enough credits) */
3466 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3467 const char *data, size_t len, loff_t off)
3468 {
3469 struct inode *inode = sb_dqopt(sb)->files[type];
3470 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3471 int err = 0;
3472 int offset = off & (sb->s_blocksize - 1);
3473 int tocopy;
3474 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3475 size_t towrite = len;
3476 struct buffer_head *bh;
3477 handle_t *handle = journal_current_handle();
3478
3479 if (!handle) {
3480 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
3481 " cancelled because transaction is not started.\n",
3482 (unsigned long long)off, (unsigned long long)len);
3483 return -EIO;
3484 }
3485 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3486 while (towrite > 0) {
3487 tocopy = sb->s_blocksize - offset < towrite ?
3488 sb->s_blocksize - offset : towrite;
3489 bh = ext4_bread(handle, inode, blk, 1, &err);
3490 if (!bh)
3491 goto out;
3492 if (journal_quota) {
3493 err = ext4_journal_get_write_access(handle, bh);
3494 if (err) {
3495 brelse(bh);
3496 goto out;
3497 }
3498 }
3499 lock_buffer(bh);
3500 memcpy(bh->b_data+offset, data, tocopy);
3501 flush_dcache_page(bh->b_page);
3502 unlock_buffer(bh);
3503 if (journal_quota)
3504 err = ext4_journal_dirty_metadata(handle, bh);
3505 else {
3506 /* Always do at least ordered writes for quotas */
3507 err = ext4_jbd2_file_inode(handle, inode);
3508 mark_buffer_dirty(bh);
3509 }
3510 brelse(bh);
3511 if (err)
3512 goto out;
3513 offset = 0;
3514 towrite -= tocopy;
3515 data += tocopy;
3516 blk++;
3517 }
3518 out:
3519 if (len == towrite) {
3520 mutex_unlock(&inode->i_mutex);
3521 return err;
3522 }
3523 if (inode->i_size < off+len-towrite) {
3524 i_size_write(inode, off+len-towrite);
3525 EXT4_I(inode)->i_disksize = inode->i_size;
3526 }
3527 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3528 ext4_mark_inode_dirty(handle, inode);
3529 mutex_unlock(&inode->i_mutex);
3530 return len - towrite;
3531 }
3532
3533 #endif
3534
3535 static int ext4_get_sb(struct file_system_type *fs_type,
3536 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3537 {
3538 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3539 }
3540
3541 #ifdef CONFIG_PROC_FS
3542 static int ext4_ui_proc_show(struct seq_file *m, void *v)
3543 {
3544 unsigned int *p = m->private;
3545
3546 seq_printf(m, "%u\n", *p);
3547 return 0;
3548 }
3549
3550 static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3551 {
3552 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3553 }
3554
3555 static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3556 size_t cnt, loff_t *ppos)
3557 {
3558 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
3559 char str[32];
3560 unsigned long value;
3561
3562 if (cnt >= sizeof(str))
3563 return -EINVAL;
3564 if (copy_from_user(str, buf, cnt))
3565 return -EFAULT;
3566 value = simple_strtol(str, NULL, 0);
3567 if (value < 0)
3568 return -ERANGE;
3569 *p = value;
3570 return cnt;
3571 }
3572
3573 const struct file_operations ext4_ui_proc_fops = {
3574 .owner = THIS_MODULE,
3575 .open = ext4_ui_proc_open,
3576 .read = seq_read,
3577 .llseek = seq_lseek,
3578 .release = single_release,
3579 .write = ext4_ui_proc_write,
3580 };
3581 #endif
3582
3583 static struct file_system_type ext4dev_fs_type = {
3584 .owner = THIS_MODULE,
3585 .name = "ext4dev",
3586 .get_sb = ext4_get_sb,
3587 .kill_sb = kill_block_super,
3588 .fs_flags = FS_REQUIRES_DEV,
3589 };
3590
3591 static int __init init_ext4_fs(void)
3592 {
3593 int err;
3594
3595 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
3596 err = init_ext4_mballoc();
3597 if (err)
3598 return err;
3599
3600 err = init_ext4_xattr();
3601 if (err)
3602 goto out2;
3603 err = init_inodecache();
3604 if (err)
3605 goto out1;
3606 err = register_filesystem(&ext4dev_fs_type);
3607 if (err)
3608 goto out;
3609 return 0;
3610 out:
3611 destroy_inodecache();
3612 out1:
3613 exit_ext4_xattr();
3614 out2:
3615 exit_ext4_mballoc();
3616 return err;
3617 }
3618
3619 static void __exit exit_ext4_fs(void)
3620 {
3621 unregister_filesystem(&ext4dev_fs_type);
3622 destroy_inodecache();
3623 exit_ext4_xattr();
3624 exit_ext4_mballoc();
3625 remove_proc_entry("fs/ext4", NULL);
3626 }
3627
3628 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3629 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3630 MODULE_LICENSE("GPL");
3631 module_init(init_ext4_fs)
3632 module_exit(exit_ext4_fs)
linux 2.6 git repository for openrd