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Linux 2.6.28.1
[linux/fpc-iii.git] / fs / ext4 / super.c
blobe4a241c65dbeb79d189d84b08010430274c6755f
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/marker.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <asm/uaccess.h>
42
43 #include "ext4.h"
44 #include "ext4_jbd2.h"
45 #include "xattr.h"
46 #include "acl.h"
47 #include "namei.h"
48 #include "group.h"
49
50 struct proc_dir_entry *ext4_proc_root;
51
52 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
53 unsigned long journal_devnum);
54 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
55 unsigned int);
56 static void ext4_commit_super(struct super_block *sb,
57 struct ext4_super_block *es, int sync);
58 static void ext4_mark_recovery_complete(struct super_block *sb,
59 struct ext4_super_block *es);
60 static void ext4_clear_journal_err(struct super_block *sb,
61 struct ext4_super_block *es);
62 static int ext4_sync_fs(struct super_block *sb, int wait);
63 static const char *ext4_decode_error(struct super_block *sb, int errno,
64 char nbuf[16]);
65 static int ext4_remount(struct super_block *sb, int *flags, char *data);
66 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
67 static void ext4_unlockfs(struct super_block *sb);
68 static void ext4_write_super(struct super_block *sb);
69 static void ext4_write_super_lockfs(struct super_block *sb);
70
71
72 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
73 struct ext4_group_desc *bg)
74 {
75 return le32_to_cpu(bg->bg_block_bitmap_lo) |
76 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
77 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
78 }
79
80 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
82 {
83 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
85 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
86 }
87
88 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
89 struct ext4_group_desc *bg)
90 {
91 return le32_to_cpu(bg->bg_inode_table_lo) |
92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
94 }
95
96 void ext4_block_bitmap_set(struct super_block *sb,
97 struct ext4_group_desc *bg, ext4_fsblk_t blk)
98 {
99 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
100 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
101 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
102 }
103
104 void ext4_inode_bitmap_set(struct super_block *sb,
105 struct ext4_group_desc *bg, ext4_fsblk_t blk)
106 {
107 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
108 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
109 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
110 }
111
112 void ext4_inode_table_set(struct super_block *sb,
113 struct ext4_group_desc *bg, ext4_fsblk_t blk)
114 {
115 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
116 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
117 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
118 }
119
120 /*
121 * Wrappers for jbd2_journal_start/end.
122 *
123 * The only special thing we need to do here is to make sure that all
124 * journal_end calls result in the superblock being marked dirty, so
125 * that sync() will call the filesystem's write_super callback if
126 * appropriate.
127 */
128 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
129 {
130 journal_t *journal;
131
132 if (sb->s_flags & MS_RDONLY)
133 return ERR_PTR(-EROFS);
134
135 /* Special case here: if the journal has aborted behind our
136 * backs (eg. EIO in the commit thread), then we still need to
137 * take the FS itself readonly cleanly. */
138 journal = EXT4_SB(sb)->s_journal;
139 if (is_journal_aborted(journal)) {
140 ext4_abort(sb, __func__,
141 "Detected aborted journal");
142 return ERR_PTR(-EROFS);
143 }
144
145 return jbd2_journal_start(journal, nblocks);
146 }
147
148 /*
149 * The only special thing we need to do here is to make sure that all
150 * jbd2_journal_stop calls result in the superblock being marked dirty, so
151 * that sync() will call the filesystem's write_super callback if
152 * appropriate.
153 */
154 int __ext4_journal_stop(const char *where, handle_t *handle)
155 {
156 struct super_block *sb;
157 int err;
158 int rc;
159
160 sb = handle->h_transaction->t_journal->j_private;
161 err = handle->h_err;
162 rc = jbd2_journal_stop(handle);
163
164 if (!err)
165 err = rc;
166 if (err)
167 __ext4_std_error(sb, where, err);
168 return err;
169 }
170
171 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
172 struct buffer_head *bh, handle_t *handle, int err)
173 {
174 char nbuf[16];
175 const char *errstr = ext4_decode_error(NULL, err, nbuf);
176
177 if (bh)
178 BUFFER_TRACE(bh, "abort");
179
180 if (!handle->h_err)
181 handle->h_err = err;
182
183 if (is_handle_aborted(handle))
184 return;
185
186 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
187 caller, errstr, err_fn);
188
189 jbd2_journal_abort_handle(handle);
190 }
191
192 /* Deal with the reporting of failure conditions on a filesystem such as
193 * inconsistencies detected or read IO failures.
194 *
195 * On ext2, we can store the error state of the filesystem in the
196 * superblock. That is not possible on ext4, because we may have other
197 * write ordering constraints on the superblock which prevent us from
198 * writing it out straight away; and given that the journal is about to
199 * be aborted, we can't rely on the current, or future, transactions to
200 * write out the superblock safely.
201 *
202 * We'll just use the jbd2_journal_abort() error code to record an error in
203 * the journal instead. On recovery, the journal will compain about
204 * that error until we've noted it down and cleared it.
205 */
206
207 static void ext4_handle_error(struct super_block *sb)
208 {
209 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
210
211 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
212 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
213
214 if (sb->s_flags & MS_RDONLY)
215 return;
216
217 if (!test_opt(sb, ERRORS_CONT)) {
218 journal_t *journal = EXT4_SB(sb)->s_journal;
219
220 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
221 if (journal)
222 jbd2_journal_abort(journal, -EIO);
223 }
224 if (test_opt(sb, ERRORS_RO)) {
225 printk(KERN_CRIT "Remounting filesystem read-only\n");
226 sb->s_flags |= MS_RDONLY;
227 }
228 ext4_commit_super(sb, es, 1);
229 if (test_opt(sb, ERRORS_PANIC))
230 panic("EXT4-fs (device %s): panic forced after error\n",
231 sb->s_id);
232 }
233
234 void ext4_error(struct super_block *sb, const char *function,
235 const char *fmt, ...)
236 {
237 va_list args;
238
239 va_start(args, fmt);
240 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
241 vprintk(fmt, args);
242 printk("\n");
243 va_end(args);
244
245 ext4_handle_error(sb);
246 }
247
248 static const char *ext4_decode_error(struct super_block *sb, int errno,
249 char nbuf[16])
250 {
251 char *errstr = NULL;
252
253 switch (errno) {
254 case -EIO:
255 errstr = "IO failure";
256 break;
257 case -ENOMEM:
258 errstr = "Out of memory";
259 break;
260 case -EROFS:
261 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
262 errstr = "Journal has aborted";
263 else
264 errstr = "Readonly filesystem";
265 break;
266 default:
267 /* If the caller passed in an extra buffer for unknown
268 * errors, textualise them now. Else we just return
269 * NULL. */
270 if (nbuf) {
271 /* Check for truncated error codes... */
272 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
273 errstr = nbuf;
274 }
275 break;
276 }
277
278 return errstr;
279 }
280
281 /* __ext4_std_error decodes expected errors from journaling functions
282 * automatically and invokes the appropriate error response. */
283
284 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
285 {
286 char nbuf[16];
287 const char *errstr;
288
289 /* Special case: if the error is EROFS, and we're not already
290 * inside a transaction, then there's really no point in logging
291 * an error. */
292 if (errno == -EROFS && journal_current_handle() == NULL &&
293 (sb->s_flags & MS_RDONLY))
294 return;
295
296 errstr = ext4_decode_error(sb, errno, nbuf);
297 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
298 sb->s_id, function, errstr);
299
300 ext4_handle_error(sb);
301 }
302
303 /*
304 * ext4_abort is a much stronger failure handler than ext4_error. The
305 * abort function may be used to deal with unrecoverable failures such
306 * as journal IO errors or ENOMEM at a critical moment in log management.
307 *
308 * We unconditionally force the filesystem into an ABORT|READONLY state,
309 * unless the error response on the fs has been set to panic in which
310 * case we take the easy way out and panic immediately.
311 */
312
313 void ext4_abort(struct super_block *sb, const char *function,
314 const char *fmt, ...)
315 {
316 va_list args;
317
318 printk(KERN_CRIT "ext4_abort called.\n");
319
320 va_start(args, fmt);
321 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
322 vprintk(fmt, args);
323 printk("\n");
324 va_end(args);
325
326 if (test_opt(sb, ERRORS_PANIC))
327 panic("EXT4-fs panic from previous error\n");
328
329 if (sb->s_flags & MS_RDONLY)
330 return;
331
332 printk(KERN_CRIT "Remounting filesystem read-only\n");
333 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
334 sb->s_flags |= MS_RDONLY;
335 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
336 if (EXT4_SB(sb)->s_journal)
337 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
338 }
339
340 void ext4_warning(struct super_block *sb, const char *function,
341 const char *fmt, ...)
342 {
343 va_list args;
344
345 va_start(args, fmt);
346 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
347 sb->s_id, function);
348 vprintk(fmt, args);
349 printk("\n");
350 va_end(args);
351 }
352
353 void ext4_update_dynamic_rev(struct super_block *sb)
354 {
355 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
356
357 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
358 return;
359
360 ext4_warning(sb, __func__,
361 "updating to rev %d because of new feature flag, "
362 "running e2fsck is recommended",
363 EXT4_DYNAMIC_REV);
364
365 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
366 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
367 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
368 /* leave es->s_feature_*compat flags alone */
369 /* es->s_uuid will be set by e2fsck if empty */
370
371 /*
372 * The rest of the superblock fields should be zero, and if not it
373 * means they are likely already in use, so leave them alone. We
374 * can leave it up to e2fsck to clean up any inconsistencies there.
375 */
376 }
377
378 /*
379 * Open the external journal device
380 */
381 static struct block_device *ext4_blkdev_get(dev_t dev)
382 {
383 struct block_device *bdev;
384 char b[BDEVNAME_SIZE];
385
386 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
387 if (IS_ERR(bdev))
388 goto fail;
389 return bdev;
390
391 fail:
392 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
393 __bdevname(dev, b), PTR_ERR(bdev));
394 return NULL;
395 }
396
397 /*
398 * Release the journal device
399 */
400 static int ext4_blkdev_put(struct block_device *bdev)
401 {
402 bd_release(bdev);
403 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
404 }
405
406 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
407 {
408 struct block_device *bdev;
409 int ret = -ENODEV;
410
411 bdev = sbi->journal_bdev;
412 if (bdev) {
413 ret = ext4_blkdev_put(bdev);
414 sbi->journal_bdev = NULL;
415 }
416 return ret;
417 }
418
419 static inline struct inode *orphan_list_entry(struct list_head *l)
420 {
421 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
422 }
423
424 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
425 {
426 struct list_head *l;
427
428 printk(KERN_ERR "sb orphan head is %d\n",
429 le32_to_cpu(sbi->s_es->s_last_orphan));
430
431 printk(KERN_ERR "sb_info orphan list:\n");
432 list_for_each(l, &sbi->s_orphan) {
433 struct inode *inode = orphan_list_entry(l);
434 printk(KERN_ERR " "
435 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
436 inode->i_sb->s_id, inode->i_ino, inode,
437 inode->i_mode, inode->i_nlink,
438 NEXT_ORPHAN(inode));
439 }
440 }
441
442 static void ext4_put_super(struct super_block *sb)
443 {
444 struct ext4_sb_info *sbi = EXT4_SB(sb);
445 struct ext4_super_block *es = sbi->s_es;
446 int i, err;
447
448 ext4_mb_release(sb);
449 ext4_ext_release(sb);
450 ext4_xattr_put_super(sb);
451 err = jbd2_journal_destroy(sbi->s_journal);
452 sbi->s_journal = NULL;
453 if (err < 0)
454 ext4_abort(sb, __func__, "Couldn't clean up the journal");
455
456 if (!(sb->s_flags & MS_RDONLY)) {
457 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
458 es->s_state = cpu_to_le16(sbi->s_mount_state);
459 ext4_commit_super(sb, es, 1);
460 }
461 if (sbi->s_proc) {
462 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
463 remove_proc_entry(sb->s_id, ext4_proc_root);
464 }
465
466 for (i = 0; i < sbi->s_gdb_count; i++)
467 brelse(sbi->s_group_desc[i]);
468 kfree(sbi->s_group_desc);
469 kfree(sbi->s_flex_groups);
470 percpu_counter_destroy(&sbi->s_freeblocks_counter);
471 percpu_counter_destroy(&sbi->s_freeinodes_counter);
472 percpu_counter_destroy(&sbi->s_dirs_counter);
473 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
474 brelse(sbi->s_sbh);
475 #ifdef CONFIG_QUOTA
476 for (i = 0; i < MAXQUOTAS; i++)
477 kfree(sbi->s_qf_names[i]);
478 #endif
479
480 /* Debugging code just in case the in-memory inode orphan list
481 * isn't empty. The on-disk one can be non-empty if we've
482 * detected an error and taken the fs readonly, but the
483 * in-memory list had better be clean by this point. */
484 if (!list_empty(&sbi->s_orphan))
485 dump_orphan_list(sb, sbi);
486 J_ASSERT(list_empty(&sbi->s_orphan));
487
488 invalidate_bdev(sb->s_bdev);
489 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
490 /*
491 * Invalidate the journal device's buffers. We don't want them
492 * floating about in memory - the physical journal device may
493 * hotswapped, and it breaks the `ro-after' testing code.
494 */
495 sync_blockdev(sbi->journal_bdev);
496 invalidate_bdev(sbi->journal_bdev);
497 ext4_blkdev_remove(sbi);
498 }
499 sb->s_fs_info = NULL;
500 kfree(sbi);
501 return;
502 }
503
504 static struct kmem_cache *ext4_inode_cachep;
505
506 /*
507 * Called inside transaction, so use GFP_NOFS
508 */
509 static struct inode *ext4_alloc_inode(struct super_block *sb)
510 {
511 struct ext4_inode_info *ei;
512
513 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
514 if (!ei)
515 return NULL;
516 #ifdef CONFIG_EXT4_FS_POSIX_ACL
517 ei->i_acl = EXT4_ACL_NOT_CACHED;
518 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
519 #endif
520 ei->vfs_inode.i_version = 1;
521 ei->vfs_inode.i_data.writeback_index = 0;
522 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
523 INIT_LIST_HEAD(&ei->i_prealloc_list);
524 spin_lock_init(&ei->i_prealloc_lock);
525 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
526 ei->i_reserved_data_blocks = 0;
527 ei->i_reserved_meta_blocks = 0;
528 ei->i_allocated_meta_blocks = 0;
529 ei->i_delalloc_reserved_flag = 0;
530 spin_lock_init(&(ei->i_block_reservation_lock));
531 return &ei->vfs_inode;
532 }
533
534 static void ext4_destroy_inode(struct inode *inode)
535 {
536 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
537 printk("EXT4 Inode %p: orphan list check failed!\n",
538 EXT4_I(inode));
539 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
540 EXT4_I(inode), sizeof(struct ext4_inode_info),
541 true);
542 dump_stack();
543 }
544 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
545 }
546
547 static void init_once(void *foo)
548 {
549 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
550
551 INIT_LIST_HEAD(&ei->i_orphan);
552 #ifdef CONFIG_EXT4_FS_XATTR
553 init_rwsem(&ei->xattr_sem);
554 #endif
555 init_rwsem(&ei->i_data_sem);
556 inode_init_once(&ei->vfs_inode);
557 }
558
559 static int init_inodecache(void)
560 {
561 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
562 sizeof(struct ext4_inode_info),
563 0, (SLAB_RECLAIM_ACCOUNT|
564 SLAB_MEM_SPREAD),
565 init_once);
566 if (ext4_inode_cachep == NULL)
567 return -ENOMEM;
568 return 0;
569 }
570
571 static void destroy_inodecache(void)
572 {
573 kmem_cache_destroy(ext4_inode_cachep);
574 }
575
576 static void ext4_clear_inode(struct inode *inode)
577 {
578 #ifdef CONFIG_EXT4_FS_POSIX_ACL
579 if (EXT4_I(inode)->i_acl &&
580 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
581 posix_acl_release(EXT4_I(inode)->i_acl);
582 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
583 }
584 if (EXT4_I(inode)->i_default_acl &&
585 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
586 posix_acl_release(EXT4_I(inode)->i_default_acl);
587 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
588 }
589 #endif
590 ext4_discard_preallocations(inode);
591 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
592 &EXT4_I(inode)->jinode);
593 }
594
595 static inline void ext4_show_quota_options(struct seq_file *seq,
596 struct super_block *sb)
597 {
598 #if defined(CONFIG_QUOTA)
599 struct ext4_sb_info *sbi = EXT4_SB(sb);
600
601 if (sbi->s_jquota_fmt)
602 seq_printf(seq, ",jqfmt=%s",
603 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
604
605 if (sbi->s_qf_names[USRQUOTA])
606 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
607
608 if (sbi->s_qf_names[GRPQUOTA])
609 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
610
611 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
612 seq_puts(seq, ",usrquota");
613
614 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
615 seq_puts(seq, ",grpquota");
616 #endif
617 }
618
619 /*
620 * Show an option if
621 * - it's set to a non-default value OR
622 * - if the per-sb default is different from the global default
623 */
624 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
625 {
626 int def_errors;
627 unsigned long def_mount_opts;
628 struct super_block *sb = vfs->mnt_sb;
629 struct ext4_sb_info *sbi = EXT4_SB(sb);
630 struct ext4_super_block *es = sbi->s_es;
631
632 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
633 def_errors = le16_to_cpu(es->s_errors);
634
635 if (sbi->s_sb_block != 1)
636 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
637 if (test_opt(sb, MINIX_DF))
638 seq_puts(seq, ",minixdf");
639 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
640 seq_puts(seq, ",grpid");
641 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
642 seq_puts(seq, ",nogrpid");
643 if (sbi->s_resuid != EXT4_DEF_RESUID ||
644 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
645 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
646 }
647 if (sbi->s_resgid != EXT4_DEF_RESGID ||
648 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
649 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
650 }
651 if (test_opt(sb, ERRORS_RO)) {
652 if (def_errors == EXT4_ERRORS_PANIC ||
653 def_errors == EXT4_ERRORS_CONTINUE) {
654 seq_puts(seq, ",errors=remount-ro");
655 }
656 }
657 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
658 seq_puts(seq, ",errors=continue");
659 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
660 seq_puts(seq, ",errors=panic");
661 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
662 seq_puts(seq, ",nouid32");
663 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
664 seq_puts(seq, ",debug");
665 if (test_opt(sb, OLDALLOC))
666 seq_puts(seq, ",oldalloc");
667 #ifdef CONFIG_EXT4_FS_XATTR
668 if (test_opt(sb, XATTR_USER) &&
669 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
670 seq_puts(seq, ",user_xattr");
671 if (!test_opt(sb, XATTR_USER) &&
672 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
673 seq_puts(seq, ",nouser_xattr");
674 }
675 #endif
676 #ifdef CONFIG_EXT4_FS_POSIX_ACL
677 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
678 seq_puts(seq, ",acl");
679 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
680 seq_puts(seq, ",noacl");
681 #endif
682 if (!test_opt(sb, RESERVATION))
683 seq_puts(seq, ",noreservation");
684 if (sbi->s_commit_interval) {
685 seq_printf(seq, ",commit=%u",
686 (unsigned) (sbi->s_commit_interval / HZ));
687 }
688 /*
689 * We're changing the default of barrier mount option, so
690 * let's always display its mount state so it's clear what its
691 * status is.
692 */
693 seq_puts(seq, ",barrier=");
694 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
695 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
696 seq_puts(seq, ",journal_async_commit");
697 if (test_opt(sb, NOBH))
698 seq_puts(seq, ",nobh");
699 if (!test_opt(sb, EXTENTS))
700 seq_puts(seq, ",noextents");
701 if (test_opt(sb, I_VERSION))
702 seq_puts(seq, ",i_version");
703 if (!test_opt(sb, DELALLOC))
704 seq_puts(seq, ",nodelalloc");
705
706
707 if (sbi->s_stripe)
708 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
709 /*
710 * journal mode get enabled in different ways
711 * So just print the value even if we didn't specify it
712 */
713 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
714 seq_puts(seq, ",data=journal");
715 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
716 seq_puts(seq, ",data=ordered");
717 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
718 seq_puts(seq, ",data=writeback");
719
720 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
721 seq_printf(seq, ",inode_readahead_blks=%u",
722 sbi->s_inode_readahead_blks);
723
724 if (test_opt(sb, DATA_ERR_ABORT))
725 seq_puts(seq, ",data_err=abort");
726
727 ext4_show_quota_options(seq, sb);
728 return 0;
729 }
730
731
732 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
733 u64 ino, u32 generation)
734 {
735 struct inode *inode;
736
737 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
738 return ERR_PTR(-ESTALE);
739 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
740 return ERR_PTR(-ESTALE);
741
742 /* iget isn't really right if the inode is currently unallocated!!
743 *
744 * ext4_read_inode will return a bad_inode if the inode had been
745 * deleted, so we should be safe.
746 *
747 * Currently we don't know the generation for parent directory, so
748 * a generation of 0 means "accept any"
749 */
750 inode = ext4_iget(sb, ino);
751 if (IS_ERR(inode))
752 return ERR_CAST(inode);
753 if (generation && inode->i_generation != generation) {
754 iput(inode);
755 return ERR_PTR(-ESTALE);
756 }
757
758 return inode;
759 }
760
761 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
762 int fh_len, int fh_type)
763 {
764 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
765 ext4_nfs_get_inode);
766 }
767
768 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
769 int fh_len, int fh_type)
770 {
771 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
772 ext4_nfs_get_inode);
773 }
774
775 #ifdef CONFIG_QUOTA
776 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
777 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
778
779 static int ext4_dquot_initialize(struct inode *inode, int type);
780 static int ext4_dquot_drop(struct inode *inode);
781 static int ext4_write_dquot(struct dquot *dquot);
782 static int ext4_acquire_dquot(struct dquot *dquot);
783 static int ext4_release_dquot(struct dquot *dquot);
784 static int ext4_mark_dquot_dirty(struct dquot *dquot);
785 static int ext4_write_info(struct super_block *sb, int type);
786 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
787 char *path, int remount);
788 static int ext4_quota_on_mount(struct super_block *sb, int type);
789 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
790 size_t len, loff_t off);
791 static ssize_t ext4_quota_write(struct super_block *sb, int type,
792 const char *data, size_t len, loff_t off);
793
794 static struct dquot_operations ext4_quota_operations = {
795 .initialize = ext4_dquot_initialize,
796 .drop = ext4_dquot_drop,
797 .alloc_space = dquot_alloc_space,
798 .alloc_inode = dquot_alloc_inode,
799 .free_space = dquot_free_space,
800 .free_inode = dquot_free_inode,
801 .transfer = dquot_transfer,
802 .write_dquot = ext4_write_dquot,
803 .acquire_dquot = ext4_acquire_dquot,
804 .release_dquot = ext4_release_dquot,
805 .mark_dirty = ext4_mark_dquot_dirty,
806 .write_info = ext4_write_info
807 };
808
809 static struct quotactl_ops ext4_qctl_operations = {
810 .quota_on = ext4_quota_on,
811 .quota_off = vfs_quota_off,
812 .quota_sync = vfs_quota_sync,
813 .get_info = vfs_get_dqinfo,
814 .set_info = vfs_set_dqinfo,
815 .get_dqblk = vfs_get_dqblk,
816 .set_dqblk = vfs_set_dqblk
817 };
818 #endif
819
820 static const struct super_operations ext4_sops = {
821 .alloc_inode = ext4_alloc_inode,
822 .destroy_inode = ext4_destroy_inode,
823 .write_inode = ext4_write_inode,
824 .dirty_inode = ext4_dirty_inode,
825 .delete_inode = ext4_delete_inode,
826 .put_super = ext4_put_super,
827 .write_super = ext4_write_super,
828 .sync_fs = ext4_sync_fs,
829 .write_super_lockfs = ext4_write_super_lockfs,
830 .unlockfs = ext4_unlockfs,
831 .statfs = ext4_statfs,
832 .remount_fs = ext4_remount,
833 .clear_inode = ext4_clear_inode,
834 .show_options = ext4_show_options,
835 #ifdef CONFIG_QUOTA
836 .quota_read = ext4_quota_read,
837 .quota_write = ext4_quota_write,
838 #endif
839 };
840
841 static const struct export_operations ext4_export_ops = {
842 .fh_to_dentry = ext4_fh_to_dentry,
843 .fh_to_parent = ext4_fh_to_parent,
844 .get_parent = ext4_get_parent,
845 };
846
847 enum {
848 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
849 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
850 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
851 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
852 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
853 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
854 Opt_journal_checksum, Opt_journal_async_commit,
855 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
856 Opt_data_err_abort, Opt_data_err_ignore,
857 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
858 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
859 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
860 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
861 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
862 Opt_inode_readahead_blks
863 };
864
865 static const match_table_t tokens = {
866 {Opt_bsd_df, "bsddf"},
867 {Opt_minix_df, "minixdf"},
868 {Opt_grpid, "grpid"},
869 {Opt_grpid, "bsdgroups"},
870 {Opt_nogrpid, "nogrpid"},
871 {Opt_nogrpid, "sysvgroups"},
872 {Opt_resgid, "resgid=%u"},
873 {Opt_resuid, "resuid=%u"},
874 {Opt_sb, "sb=%u"},
875 {Opt_err_cont, "errors=continue"},
876 {Opt_err_panic, "errors=panic"},
877 {Opt_err_ro, "errors=remount-ro"},
878 {Opt_nouid32, "nouid32"},
879 {Opt_debug, "debug"},
880 {Opt_oldalloc, "oldalloc"},
881 {Opt_orlov, "orlov"},
882 {Opt_user_xattr, "user_xattr"},
883 {Opt_nouser_xattr, "nouser_xattr"},
884 {Opt_acl, "acl"},
885 {Opt_noacl, "noacl"},
886 {Opt_reservation, "reservation"},
887 {Opt_noreservation, "noreservation"},
888 {Opt_noload, "noload"},
889 {Opt_nobh, "nobh"},
890 {Opt_bh, "bh"},
891 {Opt_commit, "commit=%u"},
892 {Opt_journal_update, "journal=update"},
893 {Opt_journal_inum, "journal=%u"},
894 {Opt_journal_dev, "journal_dev=%u"},
895 {Opt_journal_checksum, "journal_checksum"},
896 {Opt_journal_async_commit, "journal_async_commit"},
897 {Opt_abort, "abort"},
898 {Opt_data_journal, "data=journal"},
899 {Opt_data_ordered, "data=ordered"},
900 {Opt_data_writeback, "data=writeback"},
901 {Opt_data_err_abort, "data_err=abort"},
902 {Opt_data_err_ignore, "data_err=ignore"},
903 {Opt_offusrjquota, "usrjquota="},
904 {Opt_usrjquota, "usrjquota=%s"},
905 {Opt_offgrpjquota, "grpjquota="},
906 {Opt_grpjquota, "grpjquota=%s"},
907 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
908 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
909 {Opt_grpquota, "grpquota"},
910 {Opt_noquota, "noquota"},
911 {Opt_quota, "quota"},
912 {Opt_usrquota, "usrquota"},
913 {Opt_barrier, "barrier=%u"},
914 {Opt_extents, "extents"},
915 {Opt_noextents, "noextents"},
916 {Opt_i_version, "i_version"},
917 {Opt_stripe, "stripe=%u"},
918 {Opt_resize, "resize"},
919 {Opt_delalloc, "delalloc"},
920 {Opt_nodelalloc, "nodelalloc"},
921 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
922 {Opt_err, NULL},
923 };
924
925 static ext4_fsblk_t get_sb_block(void **data)
926 {
927 ext4_fsblk_t sb_block;
928 char *options = (char *) *data;
929
930 if (!options || strncmp(options, "sb=", 3) != 0)
931 return 1; /* Default location */
932 options += 3;
933 /*todo: use simple_strtoll with >32bit ext4 */
934 sb_block = simple_strtoul(options, &options, 0);
935 if (*options && *options != ',') {
936 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
937 (char *) *data);
938 return 1;
939 }
940 if (*options == ',')
941 options++;
942 *data = (void *) options;
943 return sb_block;
944 }
945
946 static int parse_options(char *options, struct super_block *sb,
947 unsigned int *inum, unsigned long *journal_devnum,
948 ext4_fsblk_t *n_blocks_count, int is_remount)
949 {
950 struct ext4_sb_info *sbi = EXT4_SB(sb);
951 char *p;
952 substring_t args[MAX_OPT_ARGS];
953 int data_opt = 0;
954 int option;
955 #ifdef CONFIG_QUOTA
956 int qtype, qfmt;
957 char *qname;
958 #endif
959 ext4_fsblk_t last_block;
960
961 if (!options)
962 return 1;
963
964 while ((p = strsep(&options, ",")) != NULL) {
965 int token;
966 if (!*p)
967 continue;
968
969 token = match_token(p, tokens, args);
970 switch (token) {
971 case Opt_bsd_df:
972 clear_opt(sbi->s_mount_opt, MINIX_DF);
973 break;
974 case Opt_minix_df:
975 set_opt(sbi->s_mount_opt, MINIX_DF);
976 break;
977 case Opt_grpid:
978 set_opt(sbi->s_mount_opt, GRPID);
979 break;
980 case Opt_nogrpid:
981 clear_opt(sbi->s_mount_opt, GRPID);
982 break;
983 case Opt_resuid:
984 if (match_int(&args[0], &option))
985 return 0;
986 sbi->s_resuid = option;
987 break;
988 case Opt_resgid:
989 if (match_int(&args[0], &option))
990 return 0;
991 sbi->s_resgid = option;
992 break;
993 case Opt_sb:
994 /* handled by get_sb_block() instead of here */
995 /* *sb_block = match_int(&args[0]); */
996 break;
997 case Opt_err_panic:
998 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
999 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1000 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1001 break;
1002 case Opt_err_ro:
1003 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1004 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1005 set_opt(sbi->s_mount_opt, ERRORS_RO);
1006 break;
1007 case Opt_err_cont:
1008 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1009 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1010 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1011 break;
1012 case Opt_nouid32:
1013 set_opt(sbi->s_mount_opt, NO_UID32);
1014 break;
1015 case Opt_debug:
1016 set_opt(sbi->s_mount_opt, DEBUG);
1017 break;
1018 case Opt_oldalloc:
1019 set_opt(sbi->s_mount_opt, OLDALLOC);
1020 break;
1021 case Opt_orlov:
1022 clear_opt(sbi->s_mount_opt, OLDALLOC);
1023 break;
1024 #ifdef CONFIG_EXT4_FS_XATTR
1025 case Opt_user_xattr:
1026 set_opt(sbi->s_mount_opt, XATTR_USER);
1027 break;
1028 case Opt_nouser_xattr:
1029 clear_opt(sbi->s_mount_opt, XATTR_USER);
1030 break;
1031 #else
1032 case Opt_user_xattr:
1033 case Opt_nouser_xattr:
1034 printk(KERN_ERR "EXT4 (no)user_xattr options "
1035 "not supported\n");
1036 break;
1037 #endif
1038 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1039 case Opt_acl:
1040 set_opt(sbi->s_mount_opt, POSIX_ACL);
1041 break;
1042 case Opt_noacl:
1043 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1044 break;
1045 #else
1046 case Opt_acl:
1047 case Opt_noacl:
1048 printk(KERN_ERR "EXT4 (no)acl options "
1049 "not supported\n");
1050 break;
1051 #endif
1052 case Opt_reservation:
1053 set_opt(sbi->s_mount_opt, RESERVATION);
1054 break;
1055 case Opt_noreservation:
1056 clear_opt(sbi->s_mount_opt, RESERVATION);
1057 break;
1058 case Opt_journal_update:
1059 /* @@@ FIXME */
1060 /* Eventually we will want to be able to create
1061 a journal file here. For now, only allow the
1062 user to specify an existing inode to be the
1063 journal file. */
1064 if (is_remount) {
1065 printk(KERN_ERR "EXT4-fs: cannot specify "
1066 "journal on remount\n");
1067 return 0;
1068 }
1069 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1070 break;
1071 case Opt_journal_inum:
1072 if (is_remount) {
1073 printk(KERN_ERR "EXT4-fs: cannot specify "
1074 "journal on remount\n");
1075 return 0;
1076 }
1077 if (match_int(&args[0], &option))
1078 return 0;
1079 *inum = option;
1080 break;
1081 case Opt_journal_dev:
1082 if (is_remount) {
1083 printk(KERN_ERR "EXT4-fs: cannot specify "
1084 "journal on remount\n");
1085 return 0;
1086 }
1087 if (match_int(&args[0], &option))
1088 return 0;
1089 *journal_devnum = option;
1090 break;
1091 case Opt_journal_checksum:
1092 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1093 break;
1094 case Opt_journal_async_commit:
1095 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1096 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1097 break;
1098 case Opt_noload:
1099 set_opt(sbi->s_mount_opt, NOLOAD);
1100 break;
1101 case Opt_commit:
1102 if (match_int(&args[0], &option))
1103 return 0;
1104 if (option < 0)
1105 return 0;
1106 if (option == 0)
1107 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1108 sbi->s_commit_interval = HZ * option;
1109 break;
1110 case Opt_data_journal:
1111 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1112 goto datacheck;
1113 case Opt_data_ordered:
1114 data_opt = EXT4_MOUNT_ORDERED_DATA;
1115 goto datacheck;
1116 case Opt_data_writeback:
1117 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1118 datacheck:
1119 if (is_remount) {
1120 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1121 != data_opt) {
1122 printk(KERN_ERR
1123 "EXT4-fs: cannot change data "
1124 "mode on remount\n");
1125 return 0;
1126 }
1127 } else {
1128 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1129 sbi->s_mount_opt |= data_opt;
1130 }
1131 break;
1132 case Opt_data_err_abort:
1133 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1134 break;
1135 case Opt_data_err_ignore:
1136 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1137 break;
1138 #ifdef CONFIG_QUOTA
1139 case Opt_usrjquota:
1140 qtype = USRQUOTA;
1141 goto set_qf_name;
1142 case Opt_grpjquota:
1143 qtype = GRPQUOTA;
1144 set_qf_name:
1145 if ((sb_any_quota_enabled(sb) ||
1146 sb_any_quota_suspended(sb)) &&
1147 !sbi->s_qf_names[qtype]) {
1148 printk(KERN_ERR
1149 "EXT4-fs: Cannot change journaled "
1150 "quota options when quota turned on.\n");
1151 return 0;
1152 }
1153 qname = match_strdup(&args[0]);
1154 if (!qname) {
1155 printk(KERN_ERR
1156 "EXT4-fs: not enough memory for "
1157 "storing quotafile name.\n");
1158 return 0;
1159 }
1160 if (sbi->s_qf_names[qtype] &&
1161 strcmp(sbi->s_qf_names[qtype], qname)) {
1162 printk(KERN_ERR
1163 "EXT4-fs: %s quota file already "
1164 "specified.\n", QTYPE2NAME(qtype));
1165 kfree(qname);
1166 return 0;
1167 }
1168 sbi->s_qf_names[qtype] = qname;
1169 if (strchr(sbi->s_qf_names[qtype], '/')) {
1170 printk(KERN_ERR
1171 "EXT4-fs: quotafile must be on "
1172 "filesystem root.\n");
1173 kfree(sbi->s_qf_names[qtype]);
1174 sbi->s_qf_names[qtype] = NULL;
1175 return 0;
1176 }
1177 set_opt(sbi->s_mount_opt, QUOTA);
1178 break;
1179 case Opt_offusrjquota:
1180 qtype = USRQUOTA;
1181 goto clear_qf_name;
1182 case Opt_offgrpjquota:
1183 qtype = GRPQUOTA;
1184 clear_qf_name:
1185 if ((sb_any_quota_enabled(sb) ||
1186 sb_any_quota_suspended(sb)) &&
1187 sbi->s_qf_names[qtype]) {
1188 printk(KERN_ERR "EXT4-fs: Cannot change "
1189 "journaled quota options when "
1190 "quota turned on.\n");
1191 return 0;
1192 }
1193 /*
1194 * The space will be released later when all options
1195 * are confirmed to be correct
1196 */
1197 sbi->s_qf_names[qtype] = NULL;
1198 break;
1199 case Opt_jqfmt_vfsold:
1200 qfmt = QFMT_VFS_OLD;
1201 goto set_qf_format;
1202 case Opt_jqfmt_vfsv0:
1203 qfmt = QFMT_VFS_V0;
1204 set_qf_format:
1205 if ((sb_any_quota_enabled(sb) ||
1206 sb_any_quota_suspended(sb)) &&
1207 sbi->s_jquota_fmt != qfmt) {
1208 printk(KERN_ERR "EXT4-fs: Cannot change "
1209 "journaled quota options when "
1210 "quota turned on.\n");
1211 return 0;
1212 }
1213 sbi->s_jquota_fmt = qfmt;
1214 break;
1215 case Opt_quota:
1216 case Opt_usrquota:
1217 set_opt(sbi->s_mount_opt, QUOTA);
1218 set_opt(sbi->s_mount_opt, USRQUOTA);
1219 break;
1220 case Opt_grpquota:
1221 set_opt(sbi->s_mount_opt, QUOTA);
1222 set_opt(sbi->s_mount_opt, GRPQUOTA);
1223 break;
1224 case Opt_noquota:
1225 if (sb_any_quota_enabled(sb)) {
1226 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1227 "options when quota turned on.\n");
1228 return 0;
1229 }
1230 clear_opt(sbi->s_mount_opt, QUOTA);
1231 clear_opt(sbi->s_mount_opt, USRQUOTA);
1232 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1233 break;
1234 #else
1235 case Opt_quota:
1236 case Opt_usrquota:
1237 case Opt_grpquota:
1238 printk(KERN_ERR
1239 "EXT4-fs: quota options not supported.\n");
1240 break;
1241 case Opt_usrjquota:
1242 case Opt_grpjquota:
1243 case Opt_offusrjquota:
1244 case Opt_offgrpjquota:
1245 case Opt_jqfmt_vfsold:
1246 case Opt_jqfmt_vfsv0:
1247 printk(KERN_ERR
1248 "EXT4-fs: journaled quota options not "
1249 "supported.\n");
1250 break;
1251 case Opt_noquota:
1252 break;
1253 #endif
1254 case Opt_abort:
1255 set_opt(sbi->s_mount_opt, ABORT);
1256 break;
1257 case Opt_barrier:
1258 if (match_int(&args[0], &option))
1259 return 0;
1260 if (option)
1261 set_opt(sbi->s_mount_opt, BARRIER);
1262 else
1263 clear_opt(sbi->s_mount_opt, BARRIER);
1264 break;
1265 case Opt_ignore:
1266 break;
1267 case Opt_resize:
1268 if (!is_remount) {
1269 printk("EXT4-fs: resize option only available "
1270 "for remount\n");
1271 return 0;
1272 }
1273 if (match_int(&args[0], &option) != 0)
1274 return 0;
1275 *n_blocks_count = option;
1276 break;
1277 case Opt_nobh:
1278 set_opt(sbi->s_mount_opt, NOBH);
1279 break;
1280 case Opt_bh:
1281 clear_opt(sbi->s_mount_opt, NOBH);
1282 break;
1283 case Opt_extents:
1284 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1285 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1286 ext4_warning(sb, __func__,
1287 "extents feature not enabled "
1288 "on this filesystem, use tune2fs\n");
1289 return 0;
1290 }
1291 set_opt(sbi->s_mount_opt, EXTENTS);
1292 break;
1293 case Opt_noextents:
1294 /*
1295 * When e2fsprogs support resizing an already existing
1296 * ext3 file system to greater than 2**32 we need to
1297 * add support to block allocator to handle growing
1298 * already existing block mapped inode so that blocks
1299 * allocated for them fall within 2**32
1300 */
1301 last_block = ext4_blocks_count(sbi->s_es) - 1;
1302 if (last_block > 0xffffffffULL) {
1303 printk(KERN_ERR "EXT4-fs: Filesystem too "
1304 "large to mount with "
1305 "-o noextents options\n");
1306 return 0;
1307 }
1308 clear_opt(sbi->s_mount_opt, EXTENTS);
1309 break;
1310 case Opt_i_version:
1311 set_opt(sbi->s_mount_opt, I_VERSION);
1312 sb->s_flags |= MS_I_VERSION;
1313 break;
1314 case Opt_nodelalloc:
1315 clear_opt(sbi->s_mount_opt, DELALLOC);
1316 break;
1317 case Opt_stripe:
1318 if (match_int(&args[0], &option))
1319 return 0;
1320 if (option < 0)
1321 return 0;
1322 sbi->s_stripe = option;
1323 break;
1324 case Opt_delalloc:
1325 set_opt(sbi->s_mount_opt, DELALLOC);
1326 break;
1327 case Opt_inode_readahead_blks:
1328 if (match_int(&args[0], &option))
1329 return 0;
1330 if (option < 0 || option > (1 << 30))
1331 return 0;
1332 sbi->s_inode_readahead_blks = option;
1333 break;
1334 default:
1335 printk(KERN_ERR
1336 "EXT4-fs: Unrecognized mount option \"%s\" "
1337 "or missing value\n", p);
1338 return 0;
1339 }
1340 }
1341 #ifdef CONFIG_QUOTA
1342 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1343 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1344 sbi->s_qf_names[USRQUOTA])
1345 clear_opt(sbi->s_mount_opt, USRQUOTA);
1346
1347 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1348 sbi->s_qf_names[GRPQUOTA])
1349 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1350
1351 if ((sbi->s_qf_names[USRQUOTA] &&
1352 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1353 (sbi->s_qf_names[GRPQUOTA] &&
1354 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1355 printk(KERN_ERR "EXT4-fs: old and new quota "
1356 "format mixing.\n");
1357 return 0;
1358 }
1359
1360 if (!sbi->s_jquota_fmt) {
1361 printk(KERN_ERR "EXT4-fs: journaled quota format "
1362 "not specified.\n");
1363 return 0;
1364 }
1365 } else {
1366 if (sbi->s_jquota_fmt) {
1367 printk(KERN_ERR "EXT4-fs: journaled quota format "
1368 "specified with no journaling "
1369 "enabled.\n");
1370 return 0;
1371 }
1372 }
1373 #endif
1374 return 1;
1375 }
1376
1377 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1378 int read_only)
1379 {
1380 struct ext4_sb_info *sbi = EXT4_SB(sb);
1381 int res = 0;
1382
1383 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1384 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1385 "forcing read-only mode\n");
1386 res = MS_RDONLY;
1387 }
1388 if (read_only)
1389 return res;
1390 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1391 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1392 "running e2fsck is recommended\n");
1393 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1394 printk(KERN_WARNING
1395 "EXT4-fs warning: mounting fs with errors, "
1396 "running e2fsck is recommended\n");
1397 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1398 le16_to_cpu(es->s_mnt_count) >=
1399 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1400 printk(KERN_WARNING
1401 "EXT4-fs warning: maximal mount count reached, "
1402 "running e2fsck is recommended\n");
1403 else if (le32_to_cpu(es->s_checkinterval) &&
1404 (le32_to_cpu(es->s_lastcheck) +
1405 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1406 printk(KERN_WARNING
1407 "EXT4-fs warning: checktime reached, "
1408 "running e2fsck is recommended\n");
1409 #if 0
1410 /* @@@ We _will_ want to clear the valid bit if we find
1411 * inconsistencies, to force a fsck at reboot. But for
1412 * a plain journaled filesystem we can keep it set as
1413 * valid forever! :)
1414 */
1415 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1416 #endif
1417 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1418 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1419 le16_add_cpu(&es->s_mnt_count, 1);
1420 es->s_mtime = cpu_to_le32(get_seconds());
1421 ext4_update_dynamic_rev(sb);
1422 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1423
1424 ext4_commit_super(sb, es, 1);
1425 if (test_opt(sb, DEBUG))
1426 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1427 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1428 sb->s_blocksize,
1429 sbi->s_groups_count,
1430 EXT4_BLOCKS_PER_GROUP(sb),
1431 EXT4_INODES_PER_GROUP(sb),
1432 sbi->s_mount_opt);
1433
1434 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1435 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1436 "external", EXT4_SB(sb)->s_journal->j_devname);
1437 return res;
1438 }
1439
1440 static int ext4_fill_flex_info(struct super_block *sb)
1441 {
1442 struct ext4_sb_info *sbi = EXT4_SB(sb);
1443 struct ext4_group_desc *gdp = NULL;
1444 struct buffer_head *bh;
1445 ext4_group_t flex_group_count;
1446 ext4_group_t flex_group;
1447 int groups_per_flex = 0;
1448 __u64 block_bitmap = 0;
1449 int i;
1450
1451 if (!sbi->s_es->s_log_groups_per_flex) {
1452 sbi->s_log_groups_per_flex = 0;
1453 return 1;
1454 }
1455
1456 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1457 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1458
1459 /* We allocate both existing and potentially added groups */
1460 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1461 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1462 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1463 sbi->s_flex_groups = kzalloc(flex_group_count *
1464 sizeof(struct flex_groups), GFP_KERNEL);
1465 if (sbi->s_flex_groups == NULL) {
1466 printk(KERN_ERR "EXT4-fs: not enough memory for "
1467 "%lu flex groups\n", flex_group_count);
1468 goto failed;
1469 }
1470
1471 gdp = ext4_get_group_desc(sb, 1, &bh);
1472 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1473
1474 for (i = 0; i < sbi->s_groups_count; i++) {
1475 gdp = ext4_get_group_desc(sb, i, &bh);
1476
1477 flex_group = ext4_flex_group(sbi, i);
1478 sbi->s_flex_groups[flex_group].free_inodes +=
1479 le16_to_cpu(gdp->bg_free_inodes_count);
1480 sbi->s_flex_groups[flex_group].free_blocks +=
1481 le16_to_cpu(gdp->bg_free_blocks_count);
1482 }
1483
1484 return 1;
1485 failed:
1486 return 0;
1487 }
1488
1489 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1490 struct ext4_group_desc *gdp)
1491 {
1492 __u16 crc = 0;
1493
1494 if (sbi->s_es->s_feature_ro_compat &
1495 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1496 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1497 __le32 le_group = cpu_to_le32(block_group);
1498
1499 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1500 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1501 crc = crc16(crc, (__u8 *)gdp, offset);
1502 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1503 /* for checksum of struct ext4_group_desc do the rest...*/
1504 if ((sbi->s_es->s_feature_incompat &
1505 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1506 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1507 crc = crc16(crc, (__u8 *)gdp + offset,
1508 le16_to_cpu(sbi->s_es->s_desc_size) -
1509 offset);
1510 }
1511
1512 return cpu_to_le16(crc);
1513 }
1514
1515 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1516 struct ext4_group_desc *gdp)
1517 {
1518 if ((sbi->s_es->s_feature_ro_compat &
1519 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1520 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1521 return 0;
1522
1523 return 1;
1524 }
1525
1526 /* Called at mount-time, super-block is locked */
1527 static int ext4_check_descriptors(struct super_block *sb)
1528 {
1529 struct ext4_sb_info *sbi = EXT4_SB(sb);
1530 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1531 ext4_fsblk_t last_block;
1532 ext4_fsblk_t block_bitmap;
1533 ext4_fsblk_t inode_bitmap;
1534 ext4_fsblk_t inode_table;
1535 int flexbg_flag = 0;
1536 ext4_group_t i;
1537
1538 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1539 flexbg_flag = 1;
1540
1541 ext4_debug("Checking group descriptors");
1542
1543 for (i = 0; i < sbi->s_groups_count; i++) {
1544 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1545
1546 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1547 last_block = ext4_blocks_count(sbi->s_es) - 1;
1548 else
1549 last_block = first_block +
1550 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1551
1552 block_bitmap = ext4_block_bitmap(sb, gdp);
1553 if (block_bitmap < first_block || block_bitmap > last_block) {
1554 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1555 "Block bitmap for group %lu not in group "
1556 "(block %llu)!\n", i, block_bitmap);
1557 return 0;
1558 }
1559 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1560 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1561 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1562 "Inode bitmap for group %lu not in group "
1563 "(block %llu)!\n", i, inode_bitmap);
1564 return 0;
1565 }
1566 inode_table = ext4_inode_table(sb, gdp);
1567 if (inode_table < first_block ||
1568 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1569 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1570 "Inode table for group %lu not in group "
1571 "(block %llu)!\n", i, inode_table);
1572 return 0;
1573 }
1574 spin_lock(sb_bgl_lock(sbi, i));
1575 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1576 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1577 "Checksum for group %lu failed (%u!=%u)\n",
1578 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1579 gdp)), le16_to_cpu(gdp->bg_checksum));
1580 if (!(sb->s_flags & MS_RDONLY)) {
1581 spin_unlock(sb_bgl_lock(sbi, i));
1582 return 0;
1583 }
1584 }
1585 spin_unlock(sb_bgl_lock(sbi, i));
1586 if (!flexbg_flag)
1587 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1588 }
1589
1590 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1591 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
1592 return 1;
1593 }
1594
1595 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1596 * the superblock) which were deleted from all directories, but held open by
1597 * a process at the time of a crash. We walk the list and try to delete these
1598 * inodes at recovery time (only with a read-write filesystem).
1599 *
1600 * In order to keep the orphan inode chain consistent during traversal (in
1601 * case of crash during recovery), we link each inode into the superblock
1602 * orphan list_head and handle it the same way as an inode deletion during
1603 * normal operation (which journals the operations for us).
1604 *
1605 * We only do an iget() and an iput() on each inode, which is very safe if we
1606 * accidentally point at an in-use or already deleted inode. The worst that
1607 * can happen in this case is that we get a "bit already cleared" message from
1608 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1609 * e2fsck was run on this filesystem, and it must have already done the orphan
1610 * inode cleanup for us, so we can safely abort without any further action.
1611 */
1612 static void ext4_orphan_cleanup(struct super_block *sb,
1613 struct ext4_super_block *es)
1614 {
1615 unsigned int s_flags = sb->s_flags;
1616 int nr_orphans = 0, nr_truncates = 0;
1617 #ifdef CONFIG_QUOTA
1618 int i;
1619 #endif
1620 if (!es->s_last_orphan) {
1621 jbd_debug(4, "no orphan inodes to clean up\n");
1622 return;
1623 }
1624
1625 if (bdev_read_only(sb->s_bdev)) {
1626 printk(KERN_ERR "EXT4-fs: write access "
1627 "unavailable, skipping orphan cleanup.\n");
1628 return;
1629 }
1630
1631 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1632 if (es->s_last_orphan)
1633 jbd_debug(1, "Errors on filesystem, "
1634 "clearing orphan list.\n");
1635 es->s_last_orphan = 0;
1636 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1637 return;
1638 }
1639
1640 if (s_flags & MS_RDONLY) {
1641 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1642 sb->s_id);
1643 sb->s_flags &= ~MS_RDONLY;
1644 }
1645 #ifdef CONFIG_QUOTA
1646 /* Needed for iput() to work correctly and not trash data */
1647 sb->s_flags |= MS_ACTIVE;
1648 /* Turn on quotas so that they are updated correctly */
1649 for (i = 0; i < MAXQUOTAS; i++) {
1650 if (EXT4_SB(sb)->s_qf_names[i]) {
1651 int ret = ext4_quota_on_mount(sb, i);
1652 if (ret < 0)
1653 printk(KERN_ERR
1654 "EXT4-fs: Cannot turn on journaled "
1655 "quota: error %d\n", ret);
1656 }
1657 }
1658 #endif
1659
1660 while (es->s_last_orphan) {
1661 struct inode *inode;
1662
1663 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1664 if (IS_ERR(inode)) {
1665 es->s_last_orphan = 0;
1666 break;
1667 }
1668
1669 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1670 DQUOT_INIT(inode);
1671 if (inode->i_nlink) {
1672 printk(KERN_DEBUG
1673 "%s: truncating inode %lu to %lld bytes\n",
1674 __func__, inode->i_ino, inode->i_size);
1675 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1676 inode->i_ino, inode->i_size);
1677 ext4_truncate(inode);
1678 nr_truncates++;
1679 } else {
1680 printk(KERN_DEBUG
1681 "%s: deleting unreferenced inode %lu\n",
1682 __func__, inode->i_ino);
1683 jbd_debug(2, "deleting unreferenced inode %lu\n",
1684 inode->i_ino);
1685 nr_orphans++;
1686 }
1687 iput(inode); /* The delete magic happens here! */
1688 }
1689
1690 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1691
1692 if (nr_orphans)
1693 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1694 sb->s_id, PLURAL(nr_orphans));
1695 if (nr_truncates)
1696 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1697 sb->s_id, PLURAL(nr_truncates));
1698 #ifdef CONFIG_QUOTA
1699 /* Turn quotas off */
1700 for (i = 0; i < MAXQUOTAS; i++) {
1701 if (sb_dqopt(sb)->files[i])
1702 vfs_quota_off(sb, i, 0);
1703 }
1704 #endif
1705 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1706 }
1707 /*
1708 * Maximal extent format file size.
1709 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1710 * extent format containers, within a sector_t, and within i_blocks
1711 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1712 * so that won't be a limiting factor.
1713 *
1714 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1715 */
1716 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1717 {
1718 loff_t res;
1719 loff_t upper_limit = MAX_LFS_FILESIZE;
1720
1721 /* small i_blocks in vfs inode? */
1722 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1723 /*
1724 * CONFIG_LSF is not enabled implies the inode
1725 * i_block represent total blocks in 512 bytes
1726 * 32 == size of vfs inode i_blocks * 8
1727 */
1728 upper_limit = (1LL << 32) - 1;
1729
1730 /* total blocks in file system block size */
1731 upper_limit >>= (blkbits - 9);
1732 upper_limit <<= blkbits;
1733 }
1734
1735 /* 32-bit extent-start container, ee_block */
1736 res = 1LL << 32;
1737 res <<= blkbits;
1738 res -= 1;
1739
1740 /* Sanity check against vm- & vfs- imposed limits */
1741 if (res > upper_limit)
1742 res = upper_limit;
1743
1744 return res;
1745 }
1746
1747 /*
1748 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1749 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1750 * We need to be 1 filesystem block less than the 2^48 sector limit.
1751 */
1752 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
1753 {
1754 loff_t res = EXT4_NDIR_BLOCKS;
1755 int meta_blocks;
1756 loff_t upper_limit;
1757 /* This is calculated to be the largest file size for a
1758 * dense, bitmapped file such that the total number of
1759 * sectors in the file, including data and all indirect blocks,
1760 * does not exceed 2^48 -1
1761 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1762 * total number of 512 bytes blocks of the file
1763 */
1764
1765 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1766 /*
1767 * !has_huge_files or CONFIG_LSF is not enabled
1768 * implies the inode i_block represent total blocks in
1769 * 512 bytes 32 == size of vfs inode i_blocks * 8
1770 */
1771 upper_limit = (1LL << 32) - 1;
1772
1773 /* total blocks in file system block size */
1774 upper_limit >>= (bits - 9);
1775
1776 } else {
1777 /*
1778 * We use 48 bit ext4_inode i_blocks
1779 * With EXT4_HUGE_FILE_FL set the i_blocks
1780 * represent total number of blocks in
1781 * file system block size
1782 */
1783 upper_limit = (1LL << 48) - 1;
1784
1785 }
1786
1787 /* indirect blocks */
1788 meta_blocks = 1;
1789 /* double indirect blocks */
1790 meta_blocks += 1 + (1LL << (bits-2));
1791 /* tripple indirect blocks */
1792 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1793
1794 upper_limit -= meta_blocks;
1795 upper_limit <<= bits;
1796
1797 res += 1LL << (bits-2);
1798 res += 1LL << (2*(bits-2));
1799 res += 1LL << (3*(bits-2));
1800 res <<= bits;
1801 if (res > upper_limit)
1802 res = upper_limit;
1803
1804 if (res > MAX_LFS_FILESIZE)
1805 res = MAX_LFS_FILESIZE;
1806
1807 return res;
1808 }
1809
1810 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1811 ext4_fsblk_t logical_sb_block, int nr)
1812 {
1813 struct ext4_sb_info *sbi = EXT4_SB(sb);
1814 ext4_group_t bg, first_meta_bg;
1815 int has_super = 0;
1816
1817 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1818
1819 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1820 nr < first_meta_bg)
1821 return logical_sb_block + nr + 1;
1822 bg = sbi->s_desc_per_block * nr;
1823 if (ext4_bg_has_super(sb, bg))
1824 has_super = 1;
1825 return (has_super + ext4_group_first_block_no(sb, bg));
1826 }
1827
1828 /**
1829 * ext4_get_stripe_size: Get the stripe size.
1830 * @sbi: In memory super block info
1831 *
1832 * If we have specified it via mount option, then
1833 * use the mount option value. If the value specified at mount time is
1834 * greater than the blocks per group use the super block value.
1835 * If the super block value is greater than blocks per group return 0.
1836 * Allocator needs it be less than blocks per group.
1837 *
1838 */
1839 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1840 {
1841 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1842 unsigned long stripe_width =
1843 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1844
1845 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1846 return sbi->s_stripe;
1847
1848 if (stripe_width <= sbi->s_blocks_per_group)
1849 return stripe_width;
1850
1851 if (stride <= sbi->s_blocks_per_group)
1852 return stride;
1853
1854 return 0;
1855 }
1856
1857 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
1858 __releases(kernel_lock)
1859 __acquires(kernel_lock)
1860
1861 {
1862 struct buffer_head *bh;
1863 struct ext4_super_block *es = NULL;
1864 struct ext4_sb_info *sbi;
1865 ext4_fsblk_t block;
1866 ext4_fsblk_t sb_block = get_sb_block(&data);
1867 ext4_fsblk_t logical_sb_block;
1868 unsigned long offset = 0;
1869 unsigned int journal_inum = 0;
1870 unsigned long journal_devnum = 0;
1871 unsigned long def_mount_opts;
1872 struct inode *root;
1873 char *cp;
1874 int ret = -EINVAL;
1875 int blocksize;
1876 int db_count;
1877 int i;
1878 int needs_recovery, has_huge_files;
1879 __le32 features;
1880 __u64 blocks_count;
1881 int err;
1882
1883 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1884 if (!sbi)
1885 return -ENOMEM;
1886 sb->s_fs_info = sbi;
1887 sbi->s_mount_opt = 0;
1888 sbi->s_resuid = EXT4_DEF_RESUID;
1889 sbi->s_resgid = EXT4_DEF_RESGID;
1890 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
1891 sbi->s_sb_block = sb_block;
1892
1893 unlock_kernel();
1894
1895 /* Cleanup superblock name */
1896 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
1897 *cp = '!';
1898
1899 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1900 if (!blocksize) {
1901 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1902 goto out_fail;
1903 }
1904
1905 /*
1906 * The ext4 superblock will not be buffer aligned for other than 1kB
1907 * block sizes. We need to calculate the offset from buffer start.
1908 */
1909 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1910 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1911 offset = do_div(logical_sb_block, blocksize);
1912 } else {
1913 logical_sb_block = sb_block;
1914 }
1915
1916 if (!(bh = sb_bread(sb, logical_sb_block))) {
1917 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
1918 goto out_fail;
1919 }
1920 /*
1921 * Note: s_es must be initialized as soon as possible because
1922 * some ext4 macro-instructions depend on its value
1923 */
1924 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1925 sbi->s_es = es;
1926 sb->s_magic = le16_to_cpu(es->s_magic);
1927 if (sb->s_magic != EXT4_SUPER_MAGIC)
1928 goto cantfind_ext4;
1929
1930 /* Set defaults before we parse the mount options */
1931 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1932 if (def_mount_opts & EXT4_DEFM_DEBUG)
1933 set_opt(sbi->s_mount_opt, DEBUG);
1934 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1935 set_opt(sbi->s_mount_opt, GRPID);
1936 if (def_mount_opts & EXT4_DEFM_UID16)
1937 set_opt(sbi->s_mount_opt, NO_UID32);
1938 #ifdef CONFIG_EXT4_FS_XATTR
1939 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1940 set_opt(sbi->s_mount_opt, XATTR_USER);
1941 #endif
1942 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1943 if (def_mount_opts & EXT4_DEFM_ACL)
1944 set_opt(sbi->s_mount_opt, POSIX_ACL);
1945 #endif
1946 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1947 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1948 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1949 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1950 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1951 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1952
1953 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1954 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1955 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
1956 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1957 else
1958 set_opt(sbi->s_mount_opt, ERRORS_RO);
1959
1960 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1961 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1962
1963 set_opt(sbi->s_mount_opt, RESERVATION);
1964 set_opt(sbi->s_mount_opt, BARRIER);
1965
1966 /*
1967 * turn on extents feature by default in ext4 filesystem
1968 * only if feature flag already set by mkfs or tune2fs.
1969 * Use -o noextents to turn it off
1970 */
1971 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
1972 set_opt(sbi->s_mount_opt, EXTENTS);
1973 else
1974 ext4_warning(sb, __func__,
1975 "extents feature not enabled on this filesystem, "
1976 "use tune2fs.\n");
1977
1978 /*
1979 * enable delayed allocation by default
1980 * Use -o nodelalloc to turn it off
1981 */
1982 set_opt(sbi->s_mount_opt, DELALLOC);
1983
1984
1985 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
1986 NULL, 0))
1987 goto failed_mount;
1988
1989 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1990 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1991
1992 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1993 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1994 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1995 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1996 printk(KERN_WARNING
1997 "EXT4-fs warning: feature flags set on rev 0 fs, "
1998 "running e2fsck is recommended\n");
1999
2000 /*
2001 * Check feature flags regardless of the revision level, since we
2002 * previously didn't change the revision level when setting the flags,
2003 * so there is a chance incompat flags are set on a rev 0 filesystem.
2004 */
2005 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2006 if (features) {
2007 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2008 "unsupported optional features (%x).\n",
2009 sb->s_id, le32_to_cpu(features));
2010 goto failed_mount;
2011 }
2012 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2013 if (!(sb->s_flags & MS_RDONLY) && features) {
2014 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2015 "unsupported optional features (%x).\n",
2016 sb->s_id, le32_to_cpu(features));
2017 goto failed_mount;
2018 }
2019 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2020 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2021 if (has_huge_files) {
2022 /*
2023 * Large file size enabled file system can only be
2024 * mount if kernel is build with CONFIG_LSF
2025 */
2026 if (sizeof(root->i_blocks) < sizeof(u64) &&
2027 !(sb->s_flags & MS_RDONLY)) {
2028 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2029 "files cannot be mounted read-write "
2030 "without CONFIG_LSF.\n", sb->s_id);
2031 goto failed_mount;
2032 }
2033 }
2034 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2035
2036 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2037 blocksize > EXT4_MAX_BLOCK_SIZE) {
2038 printk(KERN_ERR
2039 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2040 blocksize, sb->s_id);
2041 goto failed_mount;
2042 }
2043
2044 if (sb->s_blocksize != blocksize) {
2045
2046 /* Validate the filesystem blocksize */
2047 if (!sb_set_blocksize(sb, blocksize)) {
2048 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2049 blocksize);
2050 goto failed_mount;
2051 }
2052
2053 brelse(bh);
2054 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2055 offset = do_div(logical_sb_block, blocksize);
2056 bh = sb_bread(sb, logical_sb_block);
2057 if (!bh) {
2058 printk(KERN_ERR
2059 "EXT4-fs: Can't read superblock on 2nd try.\n");
2060 goto failed_mount;
2061 }
2062 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2063 sbi->s_es = es;
2064 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2065 printk(KERN_ERR
2066 "EXT4-fs: Magic mismatch, very weird !\n");
2067 goto failed_mount;
2068 }
2069 }
2070
2071 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2072 has_huge_files);
2073 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2074
2075 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2076 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2077 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2078 } else {
2079 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2080 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2081 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2082 (!is_power_of_2(sbi->s_inode_size)) ||
2083 (sbi->s_inode_size > blocksize)) {
2084 printk(KERN_ERR
2085 "EXT4-fs: unsupported inode size: %d\n",
2086 sbi->s_inode_size);
2087 goto failed_mount;
2088 }
2089 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2090 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2091 }
2092 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2093 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2094 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2095 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2096 !is_power_of_2(sbi->s_desc_size)) {
2097 printk(KERN_ERR
2098 "EXT4-fs: unsupported descriptor size %lu\n",
2099 sbi->s_desc_size);
2100 goto failed_mount;
2101 }
2102 } else
2103 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2104 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2105 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2106 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2107 goto cantfind_ext4;
2108 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2109 if (sbi->s_inodes_per_block == 0)
2110 goto cantfind_ext4;
2111 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2112 sbi->s_inodes_per_block;
2113 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2114 sbi->s_sbh = bh;
2115 sbi->s_mount_state = le16_to_cpu(es->s_state);
2116 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2117 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2118 for (i = 0; i < 4; i++)
2119 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2120 sbi->s_def_hash_version = es->s_def_hash_version;
2121
2122 if (sbi->s_blocks_per_group > blocksize * 8) {
2123 printk(KERN_ERR
2124 "EXT4-fs: #blocks per group too big: %lu\n",
2125 sbi->s_blocks_per_group);
2126 goto failed_mount;
2127 }
2128 if (sbi->s_inodes_per_group > blocksize * 8) {
2129 printk(KERN_ERR
2130 "EXT4-fs: #inodes per group too big: %lu\n",
2131 sbi->s_inodes_per_group);
2132 goto failed_mount;
2133 }
2134
2135 if (ext4_blocks_count(es) >
2136 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2137 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2138 " too large to mount safely\n", sb->s_id);
2139 if (sizeof(sector_t) < 8)
2140 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2141 "enabled\n");
2142 goto failed_mount;
2143 }
2144
2145 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2146 goto cantfind_ext4;
2147
2148 /* ensure blocks_count calculation below doesn't sign-extend */
2149 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2150 le32_to_cpu(es->s_first_data_block) + 1) {
2151 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2152 "first data block %u, blocks per group %lu\n",
2153 ext4_blocks_count(es),
2154 le32_to_cpu(es->s_first_data_block),
2155 EXT4_BLOCKS_PER_GROUP(sb));
2156 goto failed_mount;
2157 }
2158 blocks_count = (ext4_blocks_count(es) -
2159 le32_to_cpu(es->s_first_data_block) +
2160 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2161 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2162 sbi->s_groups_count = blocks_count;
2163 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2164 EXT4_DESC_PER_BLOCK(sb);
2165 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2166 GFP_KERNEL);
2167 if (sbi->s_group_desc == NULL) {
2168 printk(KERN_ERR "EXT4-fs: not enough memory\n");
2169 goto failed_mount;
2170 }
2171
2172 #ifdef CONFIG_PROC_FS
2173 if (ext4_proc_root)
2174 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2175
2176 if (sbi->s_proc)
2177 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2178 &ext4_ui_proc_fops,
2179 &sbi->s_inode_readahead_blks);
2180 #endif
2181
2182 bgl_lock_init(&sbi->s_blockgroup_lock);
2183
2184 for (i = 0; i < db_count; i++) {
2185 block = descriptor_loc(sb, logical_sb_block, i);
2186 sbi->s_group_desc[i] = sb_bread(sb, block);
2187 if (!sbi->s_group_desc[i]) {
2188 printk(KERN_ERR "EXT4-fs: "
2189 "can't read group descriptor %d\n", i);
2190 db_count = i;
2191 goto failed_mount2;
2192 }
2193 }
2194 if (!ext4_check_descriptors(sb)) {
2195 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2196 goto failed_mount2;
2197 }
2198 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2199 if (!ext4_fill_flex_info(sb)) {
2200 printk(KERN_ERR
2201 "EXT4-fs: unable to initialize "
2202 "flex_bg meta info!\n");
2203 goto failed_mount2;
2204 }
2205
2206 sbi->s_gdb_count = db_count;
2207 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2208 spin_lock_init(&sbi->s_next_gen_lock);
2209
2210 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2211 ext4_count_free_blocks(sb));
2212 if (!err) {
2213 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2214 ext4_count_free_inodes(sb));
2215 }
2216 if (!err) {
2217 err = percpu_counter_init(&sbi->s_dirs_counter,
2218 ext4_count_dirs(sb));
2219 }
2220 if (!err) {
2221 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2222 }
2223 if (err) {
2224 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2225 goto failed_mount3;
2226 }
2227
2228 sbi->s_stripe = ext4_get_stripe_size(sbi);
2229
2230 /*
2231 * set up enough so that it can read an inode
2232 */
2233 sb->s_op = &ext4_sops;
2234 sb->s_export_op = &ext4_export_ops;
2235 sb->s_xattr = ext4_xattr_handlers;
2236 #ifdef CONFIG_QUOTA
2237 sb->s_qcop = &ext4_qctl_operations;
2238 sb->dq_op = &ext4_quota_operations;
2239 #endif
2240 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2241
2242 sb->s_root = NULL;
2243
2244 needs_recovery = (es->s_last_orphan != 0 ||
2245 EXT4_HAS_INCOMPAT_FEATURE(sb,
2246 EXT4_FEATURE_INCOMPAT_RECOVER));
2247
2248 /*
2249 * The first inode we look at is the journal inode. Don't try
2250 * root first: it may be modified in the journal!
2251 */
2252 if (!test_opt(sb, NOLOAD) &&
2253 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2254 if (ext4_load_journal(sb, es, journal_devnum))
2255 goto failed_mount3;
2256 if (!(sb->s_flags & MS_RDONLY) &&
2257 EXT4_SB(sb)->s_journal->j_failed_commit) {
2258 printk(KERN_CRIT "EXT4-fs error (device %s): "
2259 "ext4_fill_super: Journal transaction "
2260 "%u is corrupt\n", sb->s_id,
2261 EXT4_SB(sb)->s_journal->j_failed_commit);
2262 if (test_opt(sb, ERRORS_RO)) {
2263 printk(KERN_CRIT
2264 "Mounting filesystem read-only\n");
2265 sb->s_flags |= MS_RDONLY;
2266 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2267 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2268 }
2269 if (test_opt(sb, ERRORS_PANIC)) {
2270 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2271 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2272 ext4_commit_super(sb, es, 1);
2273 printk(KERN_CRIT
2274 "EXT4-fs (device %s): mount failed\n",
2275 sb->s_id);
2276 goto failed_mount4;
2277 }
2278 }
2279 } else if (journal_inum) {
2280 if (ext4_create_journal(sb, es, journal_inum))
2281 goto failed_mount3;
2282 } else {
2283 if (!silent)
2284 printk(KERN_ERR
2285 "ext4: No journal on filesystem on %s\n",
2286 sb->s_id);
2287 goto failed_mount3;
2288 }
2289
2290 if (ext4_blocks_count(es) > 0xffffffffULL &&
2291 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2292 JBD2_FEATURE_INCOMPAT_64BIT)) {
2293 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2294 goto failed_mount4;
2295 }
2296
2297 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2298 jbd2_journal_set_features(sbi->s_journal,
2299 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2300 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2301 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2302 jbd2_journal_set_features(sbi->s_journal,
2303 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2304 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2305 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2306 } else {
2307 jbd2_journal_clear_features(sbi->s_journal,
2308 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2309 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2310 }
2311
2312 /* We have now updated the journal if required, so we can
2313 * validate the data journaling mode. */
2314 switch (test_opt(sb, DATA_FLAGS)) {
2315 case 0:
2316 /* No mode set, assume a default based on the journal
2317 * capabilities: ORDERED_DATA if the journal can
2318 * cope, else JOURNAL_DATA
2319 */
2320 if (jbd2_journal_check_available_features
2321 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2322 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2323 else
2324 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2325 break;
2326
2327 case EXT4_MOUNT_ORDERED_DATA:
2328 case EXT4_MOUNT_WRITEBACK_DATA:
2329 if (!jbd2_journal_check_available_features
2330 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2331 printk(KERN_ERR "EXT4-fs: Journal does not support "
2332 "requested data journaling mode\n");
2333 goto failed_mount4;
2334 }
2335 default:
2336 break;
2337 }
2338
2339 if (test_opt(sb, NOBH)) {
2340 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2341 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2342 "its supported only with writeback mode\n");
2343 clear_opt(sbi->s_mount_opt, NOBH);
2344 }
2345 }
2346 /*
2347 * The jbd2_journal_load will have done any necessary log recovery,
2348 * so we can safely mount the rest of the filesystem now.
2349 */
2350
2351 root = ext4_iget(sb, EXT4_ROOT_INO);
2352 if (IS_ERR(root)) {
2353 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2354 ret = PTR_ERR(root);
2355 goto failed_mount4;
2356 }
2357 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2358 iput(root);
2359 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2360 goto failed_mount4;
2361 }
2362 sb->s_root = d_alloc_root(root);
2363 if (!sb->s_root) {
2364 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2365 iput(root);
2366 ret = -ENOMEM;
2367 goto failed_mount4;
2368 }
2369
2370 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2371
2372 /* determine the minimum size of new large inodes, if present */
2373 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2374 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2375 EXT4_GOOD_OLD_INODE_SIZE;
2376 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2377 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2378 if (sbi->s_want_extra_isize <
2379 le16_to_cpu(es->s_want_extra_isize))
2380 sbi->s_want_extra_isize =
2381 le16_to_cpu(es->s_want_extra_isize);
2382 if (sbi->s_want_extra_isize <
2383 le16_to_cpu(es->s_min_extra_isize))
2384 sbi->s_want_extra_isize =
2385 le16_to_cpu(es->s_min_extra_isize);
2386 }
2387 }
2388 /* Check if enough inode space is available */
2389 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2390 sbi->s_inode_size) {
2391 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2392 EXT4_GOOD_OLD_INODE_SIZE;
2393 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2394 "available.\n");
2395 }
2396
2397 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2398 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2399 "requested data journaling mode\n");
2400 clear_opt(sbi->s_mount_opt, DELALLOC);
2401 } else if (test_opt(sb, DELALLOC))
2402 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2403
2404 ext4_ext_init(sb);
2405 err = ext4_mb_init(sb, needs_recovery);
2406 if (err) {
2407 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2408 err);
2409 goto failed_mount4;
2410 }
2411
2412 /*
2413 * akpm: core read_super() calls in here with the superblock locked.
2414 * That deadlocks, because orphan cleanup needs to lock the superblock
2415 * in numerous places. Here we just pop the lock - it's relatively
2416 * harmless, because we are now ready to accept write_super() requests,
2417 * and aviro says that's the only reason for hanging onto the
2418 * superblock lock.
2419 */
2420 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2421 ext4_orphan_cleanup(sb, es);
2422 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2423 if (needs_recovery)
2424 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
2425 ext4_mark_recovery_complete(sb, es);
2426 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2427 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2428 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2429 "writeback");
2430
2431 lock_kernel();
2432 return 0;
2433
2434 cantfind_ext4:
2435 if (!silent)
2436 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2437 sb->s_id);
2438 goto failed_mount;
2439
2440 failed_mount4:
2441 jbd2_journal_destroy(sbi->s_journal);
2442 sbi->s_journal = NULL;
2443 failed_mount3:
2444 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2445 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2446 percpu_counter_destroy(&sbi->s_dirs_counter);
2447 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2448 failed_mount2:
2449 for (i = 0; i < db_count; i++)
2450 brelse(sbi->s_group_desc[i]);
2451 kfree(sbi->s_group_desc);
2452 failed_mount:
2453 if (sbi->s_proc) {
2454 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
2455 remove_proc_entry(sb->s_id, ext4_proc_root);
2456 }
2457 #ifdef CONFIG_QUOTA
2458 for (i = 0; i < MAXQUOTAS; i++)
2459 kfree(sbi->s_qf_names[i]);
2460 #endif
2461 ext4_blkdev_remove(sbi);
2462 brelse(bh);
2463 out_fail:
2464 sb->s_fs_info = NULL;
2465 kfree(sbi);
2466 lock_kernel();
2467 return ret;
2468 }
2469
2470 /*
2471 * Setup any per-fs journal parameters now. We'll do this both on
2472 * initial mount, once the journal has been initialised but before we've
2473 * done any recovery; and again on any subsequent remount.
2474 */
2475 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2476 {
2477 struct ext4_sb_info *sbi = EXT4_SB(sb);
2478
2479 if (sbi->s_commit_interval)
2480 journal->j_commit_interval = sbi->s_commit_interval;
2481 /* We could also set up an ext4-specific default for the commit
2482 * interval here, but for now we'll just fall back to the jbd
2483 * default. */
2484
2485 spin_lock(&journal->j_state_lock);
2486 if (test_opt(sb, BARRIER))
2487 journal->j_flags |= JBD2_BARRIER;
2488 else
2489 journal->j_flags &= ~JBD2_BARRIER;
2490 if (test_opt(sb, DATA_ERR_ABORT))
2491 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2492 else
2493 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
2494 spin_unlock(&journal->j_state_lock);
2495 }
2496
2497 static journal_t *ext4_get_journal(struct super_block *sb,
2498 unsigned int journal_inum)
2499 {
2500 struct inode *journal_inode;
2501 journal_t *journal;
2502
2503 /* First, test for the existence of a valid inode on disk. Bad
2504 * things happen if we iget() an unused inode, as the subsequent
2505 * iput() will try to delete it. */
2506
2507 journal_inode = ext4_iget(sb, journal_inum);
2508 if (IS_ERR(journal_inode)) {
2509 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2510 return NULL;
2511 }
2512 if (!journal_inode->i_nlink) {
2513 make_bad_inode(journal_inode);
2514 iput(journal_inode);
2515 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2516 return NULL;
2517 }
2518
2519 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2520 journal_inode, journal_inode->i_size);
2521 if (!S_ISREG(journal_inode->i_mode)) {
2522 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2523 iput(journal_inode);
2524 return NULL;
2525 }
2526
2527 journal = jbd2_journal_init_inode(journal_inode);
2528 if (!journal) {
2529 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2530 iput(journal_inode);
2531 return NULL;
2532 }
2533 journal->j_private = sb;
2534 ext4_init_journal_params(sb, journal);
2535 return journal;
2536 }
2537
2538 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2539 dev_t j_dev)
2540 {
2541 struct buffer_head *bh;
2542 journal_t *journal;
2543 ext4_fsblk_t start;
2544 ext4_fsblk_t len;
2545 int hblock, blocksize;
2546 ext4_fsblk_t sb_block;
2547 unsigned long offset;
2548 struct ext4_super_block *es;
2549 struct block_device *bdev;
2550
2551 bdev = ext4_blkdev_get(j_dev);
2552 if (bdev == NULL)
2553 return NULL;
2554
2555 if (bd_claim(bdev, sb)) {
2556 printk(KERN_ERR
2557 "EXT4: failed to claim external journal device.\n");
2558 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2559 return NULL;
2560 }
2561
2562 blocksize = sb->s_blocksize;
2563 hblock = bdev_hardsect_size(bdev);
2564 if (blocksize < hblock) {
2565 printk(KERN_ERR
2566 "EXT4-fs: blocksize too small for journal device.\n");
2567 goto out_bdev;
2568 }
2569
2570 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2571 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2572 set_blocksize(bdev, blocksize);
2573 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2574 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2575 "external journal\n");
2576 goto out_bdev;
2577 }
2578
2579 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2580 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2581 !(le32_to_cpu(es->s_feature_incompat) &
2582 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2583 printk(KERN_ERR "EXT4-fs: external journal has "
2584 "bad superblock\n");
2585 brelse(bh);
2586 goto out_bdev;
2587 }
2588
2589 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2590 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2591 brelse(bh);
2592 goto out_bdev;
2593 }
2594
2595 len = ext4_blocks_count(es);
2596 start = sb_block + 1;
2597 brelse(bh); /* we're done with the superblock */
2598
2599 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2600 start, len, blocksize);
2601 if (!journal) {
2602 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2603 goto out_bdev;
2604 }
2605 journal->j_private = sb;
2606 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2607 wait_on_buffer(journal->j_sb_buffer);
2608 if (!buffer_uptodate(journal->j_sb_buffer)) {
2609 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2610 goto out_journal;
2611 }
2612 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2613 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2614 "user (unsupported) - %d\n",
2615 be32_to_cpu(journal->j_superblock->s_nr_users));
2616 goto out_journal;
2617 }
2618 EXT4_SB(sb)->journal_bdev = bdev;
2619 ext4_init_journal_params(sb, journal);
2620 return journal;
2621 out_journal:
2622 jbd2_journal_destroy(journal);
2623 out_bdev:
2624 ext4_blkdev_put(bdev);
2625 return NULL;
2626 }
2627
2628 static int ext4_load_journal(struct super_block *sb,
2629 struct ext4_super_block *es,
2630 unsigned long journal_devnum)
2631 {
2632 journal_t *journal;
2633 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2634 dev_t journal_dev;
2635 int err = 0;
2636 int really_read_only;
2637
2638 if (journal_devnum &&
2639 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2640 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2641 "numbers have changed\n");
2642 journal_dev = new_decode_dev(journal_devnum);
2643 } else
2644 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2645
2646 really_read_only = bdev_read_only(sb->s_bdev);
2647
2648 /*
2649 * Are we loading a blank journal or performing recovery after a
2650 * crash? For recovery, we need to check in advance whether we
2651 * can get read-write access to the device.
2652 */
2653
2654 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2655 if (sb->s_flags & MS_RDONLY) {
2656 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2657 "required on readonly filesystem.\n");
2658 if (really_read_only) {
2659 printk(KERN_ERR "EXT4-fs: write access "
2660 "unavailable, cannot proceed.\n");
2661 return -EROFS;
2662 }
2663 printk(KERN_INFO "EXT4-fs: write access will "
2664 "be enabled during recovery.\n");
2665 }
2666 }
2667
2668 if (journal_inum && journal_dev) {
2669 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2670 "and inode journals!\n");
2671 return -EINVAL;
2672 }
2673
2674 if (journal_inum) {
2675 if (!(journal = ext4_get_journal(sb, journal_inum)))
2676 return -EINVAL;
2677 } else {
2678 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2679 return -EINVAL;
2680 }
2681
2682 if (journal->j_flags & JBD2_BARRIER)
2683 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2684 else
2685 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2686
2687 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2688 err = jbd2_journal_update_format(journal);
2689 if (err) {
2690 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2691 jbd2_journal_destroy(journal);
2692 return err;
2693 }
2694 }
2695
2696 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2697 err = jbd2_journal_wipe(journal, !really_read_only);
2698 if (!err)
2699 err = jbd2_journal_load(journal);
2700
2701 if (err) {
2702 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2703 jbd2_journal_destroy(journal);
2704 return err;
2705 }
2706
2707 EXT4_SB(sb)->s_journal = journal;
2708 ext4_clear_journal_err(sb, es);
2709
2710 if (journal_devnum &&
2711 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2712 es->s_journal_dev = cpu_to_le32(journal_devnum);
2713 sb->s_dirt = 1;
2714
2715 /* Make sure we flush the recovery flag to disk. */
2716 ext4_commit_super(sb, es, 1);
2717 }
2718
2719 return 0;
2720 }
2721
2722 static int ext4_create_journal(struct super_block *sb,
2723 struct ext4_super_block *es,
2724 unsigned int journal_inum)
2725 {
2726 journal_t *journal;
2727 int err;
2728
2729 if (sb->s_flags & MS_RDONLY) {
2730 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2731 "create journal.\n");
2732 return -EROFS;
2733 }
2734
2735 journal = ext4_get_journal(sb, journal_inum);
2736 if (!journal)
2737 return -EINVAL;
2738
2739 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2740 journal_inum);
2741
2742 err = jbd2_journal_create(journal);
2743 if (err) {
2744 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2745 jbd2_journal_destroy(journal);
2746 return -EIO;
2747 }
2748
2749 EXT4_SB(sb)->s_journal = journal;
2750
2751 ext4_update_dynamic_rev(sb);
2752 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2753 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2754
2755 es->s_journal_inum = cpu_to_le32(journal_inum);
2756 sb->s_dirt = 1;
2757
2758 /* Make sure we flush the recovery flag to disk. */
2759 ext4_commit_super(sb, es, 1);
2760
2761 return 0;
2762 }
2763
2764 static void ext4_commit_super(struct super_block *sb,
2765 struct ext4_super_block *es, int sync)
2766 {
2767 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2768
2769 if (!sbh)
2770 return;
2771 if (buffer_write_io_error(sbh)) {
2772 /*
2773 * Oh, dear. A previous attempt to write the
2774 * superblock failed. This could happen because the
2775 * USB device was yanked out. Or it could happen to
2776 * be a transient write error and maybe the block will
2777 * be remapped. Nothing we can do but to retry the
2778 * write and hope for the best.
2779 */
2780 printk(KERN_ERR "ext4: previous I/O error to "
2781 "superblock detected for %s.\n", sb->s_id);
2782 clear_buffer_write_io_error(sbh);
2783 set_buffer_uptodate(sbh);
2784 }
2785 es->s_wtime = cpu_to_le32(get_seconds());
2786 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2787 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2788 BUFFER_TRACE(sbh, "marking dirty");
2789 mark_buffer_dirty(sbh);
2790 if (sync) {
2791 sync_dirty_buffer(sbh);
2792 if (buffer_write_io_error(sbh)) {
2793 printk(KERN_ERR "ext4: I/O error while writing "
2794 "superblock for %s.\n", sb->s_id);
2795 clear_buffer_write_io_error(sbh);
2796 set_buffer_uptodate(sbh);
2797 }
2798 }
2799 }
2800
2801
2802 /*
2803 * Have we just finished recovery? If so, and if we are mounting (or
2804 * remounting) the filesystem readonly, then we will end up with a
2805 * consistent fs on disk. Record that fact.
2806 */
2807 static void ext4_mark_recovery_complete(struct super_block *sb,
2808 struct ext4_super_block *es)
2809 {
2810 journal_t *journal = EXT4_SB(sb)->s_journal;
2811
2812 jbd2_journal_lock_updates(journal);
2813 if (jbd2_journal_flush(journal) < 0)
2814 goto out;
2815
2816 lock_super(sb);
2817 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2818 sb->s_flags & MS_RDONLY) {
2819 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2820 sb->s_dirt = 0;
2821 ext4_commit_super(sb, es, 1);
2822 }
2823 unlock_super(sb);
2824
2825 out:
2826 jbd2_journal_unlock_updates(journal);
2827 }
2828
2829 /*
2830 * If we are mounting (or read-write remounting) a filesystem whose journal
2831 * has recorded an error from a previous lifetime, move that error to the
2832 * main filesystem now.
2833 */
2834 static void ext4_clear_journal_err(struct super_block *sb,
2835 struct ext4_super_block *es)
2836 {
2837 journal_t *journal;
2838 int j_errno;
2839 const char *errstr;
2840
2841 journal = EXT4_SB(sb)->s_journal;
2842
2843 /*
2844 * Now check for any error status which may have been recorded in the
2845 * journal by a prior ext4_error() or ext4_abort()
2846 */
2847
2848 j_errno = jbd2_journal_errno(journal);
2849 if (j_errno) {
2850 char nbuf[16];
2851
2852 errstr = ext4_decode_error(sb, j_errno, nbuf);
2853 ext4_warning(sb, __func__, "Filesystem error recorded "
2854 "from previous mount: %s", errstr);
2855 ext4_warning(sb, __func__, "Marking fs in need of "
2856 "filesystem check.");
2857
2858 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2859 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2860 ext4_commit_super(sb, es, 1);
2861
2862 jbd2_journal_clear_err(journal);
2863 }
2864 }
2865
2866 /*
2867 * Force the running and committing transactions to commit,
2868 * and wait on the commit.
2869 */
2870 int ext4_force_commit(struct super_block *sb)
2871 {
2872 journal_t *journal;
2873 int ret;
2874
2875 if (sb->s_flags & MS_RDONLY)
2876 return 0;
2877
2878 journal = EXT4_SB(sb)->s_journal;
2879 sb->s_dirt = 0;
2880 ret = ext4_journal_force_commit(journal);
2881 return ret;
2882 }
2883
2884 /*
2885 * Ext4 always journals updates to the superblock itself, so we don't
2886 * have to propagate any other updates to the superblock on disk at this
2887 * point. (We can probably nuke this function altogether, and remove
2888 * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...)
2889 */
2890 static void ext4_write_super(struct super_block *sb)
2891 {
2892 if (mutex_trylock(&sb->s_lock) != 0)
2893 BUG();
2894 sb->s_dirt = 0;
2895 }
2896
2897 static int ext4_sync_fs(struct super_block *sb, int wait)
2898 {
2899 int ret = 0;
2900
2901 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
2902 sb->s_dirt = 0;
2903 if (wait)
2904 ret = ext4_force_commit(sb);
2905 else
2906 jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL);
2907 return ret;
2908 }
2909
2910 /*
2911 * LVM calls this function before a (read-only) snapshot is created. This
2912 * gives us a chance to flush the journal completely and mark the fs clean.
2913 */
2914 static void ext4_write_super_lockfs(struct super_block *sb)
2915 {
2916 sb->s_dirt = 0;
2917
2918 if (!(sb->s_flags & MS_RDONLY)) {
2919 journal_t *journal = EXT4_SB(sb)->s_journal;
2920
2921 /* Now we set up the journal barrier. */
2922 jbd2_journal_lock_updates(journal);
2923
2924 /*
2925 * We don't want to clear needs_recovery flag when we failed
2926 * to flush the journal.
2927 */
2928 if (jbd2_journal_flush(journal) < 0)
2929 return;
2930
2931 /* Journal blocked and flushed, clear needs_recovery flag. */
2932 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2933 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2934 }
2935 }
2936
2937 /*
2938 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2939 * flag here, even though the filesystem is not technically dirty yet.
2940 */
2941 static void ext4_unlockfs(struct super_block *sb)
2942 {
2943 if (!(sb->s_flags & MS_RDONLY)) {
2944 lock_super(sb);
2945 /* Reser the needs_recovery flag before the fs is unlocked. */
2946 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2947 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2948 unlock_super(sb);
2949 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2950 }
2951 }
2952
2953 static int ext4_remount(struct super_block *sb, int *flags, char *data)
2954 {
2955 struct ext4_super_block *es;
2956 struct ext4_sb_info *sbi = EXT4_SB(sb);
2957 ext4_fsblk_t n_blocks_count = 0;
2958 unsigned long old_sb_flags;
2959 struct ext4_mount_options old_opts;
2960 ext4_group_t g;
2961 int err;
2962 #ifdef CONFIG_QUOTA
2963 int i;
2964 #endif
2965
2966 /* Store the original options */
2967 old_sb_flags = sb->s_flags;
2968 old_opts.s_mount_opt = sbi->s_mount_opt;
2969 old_opts.s_resuid = sbi->s_resuid;
2970 old_opts.s_resgid = sbi->s_resgid;
2971 old_opts.s_commit_interval = sbi->s_commit_interval;
2972 #ifdef CONFIG_QUOTA
2973 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2974 for (i = 0; i < MAXQUOTAS; i++)
2975 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2976 #endif
2977
2978 /*
2979 * Allow the "check" option to be passed as a remount option.
2980 */
2981 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2982 err = -EINVAL;
2983 goto restore_opts;
2984 }
2985
2986 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2987 ext4_abort(sb, __func__, "Abort forced by user");
2988
2989 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2990 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2991
2992 es = sbi->s_es;
2993
2994 ext4_init_journal_params(sb, sbi->s_journal);
2995
2996 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2997 n_blocks_count > ext4_blocks_count(es)) {
2998 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2999 err = -EROFS;
3000 goto restore_opts;
3001 }
3002
3003 if (*flags & MS_RDONLY) {
3004 /*
3005 * First of all, the unconditional stuff we have to do
3006 * to disable replay of the journal when we next remount
3007 */
3008 sb->s_flags |= MS_RDONLY;
3009
3010 /*
3011 * OK, test if we are remounting a valid rw partition
3012 * readonly, and if so set the rdonly flag and then
3013 * mark the partition as valid again.
3014 */
3015 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3016 (sbi->s_mount_state & EXT4_VALID_FS))
3017 es->s_state = cpu_to_le16(sbi->s_mount_state);
3018
3019 /*
3020 * We have to unlock super so that we can wait for
3021 * transactions.
3022 */
3023 unlock_super(sb);
3024 ext4_mark_recovery_complete(sb, es);
3025 lock_super(sb);
3026 } else {
3027 __le32 ret;
3028 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3029 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3030 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3031 "remount RDWR because of unsupported "
3032 "optional features (%x).\n",
3033 sb->s_id, le32_to_cpu(ret));
3034 err = -EROFS;
3035 goto restore_opts;
3036 }
3037
3038 /*
3039 * Make sure the group descriptor checksums
3040 * are sane. If they aren't, refuse to
3041 * remount r/w.
3042 */
3043 for (g = 0; g < sbi->s_groups_count; g++) {
3044 struct ext4_group_desc *gdp =
3045 ext4_get_group_desc(sb, g, NULL);
3046
3047 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3048 printk(KERN_ERR
3049 "EXT4-fs: ext4_remount: "
3050 "Checksum for group %lu failed (%u!=%u)\n",
3051 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3052 le16_to_cpu(gdp->bg_checksum));
3053 err = -EINVAL;
3054 goto restore_opts;
3055 }
3056 }
3057
3058 /*
3059 * If we have an unprocessed orphan list hanging
3060 * around from a previously readonly bdev mount,
3061 * require a full umount/remount for now.
3062 */
3063 if (es->s_last_orphan) {
3064 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3065 "remount RDWR because of unprocessed "
3066 "orphan inode list. Please "
3067 "umount/remount instead.\n",
3068 sb->s_id);
3069 err = -EINVAL;
3070 goto restore_opts;
3071 }
3072
3073 /*
3074 * Mounting a RDONLY partition read-write, so reread
3075 * and store the current valid flag. (It may have
3076 * been changed by e2fsck since we originally mounted
3077 * the partition.)
3078 */
3079 ext4_clear_journal_err(sb, es);
3080 sbi->s_mount_state = le16_to_cpu(es->s_state);
3081 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3082 goto restore_opts;
3083 if (!ext4_setup_super(sb, es, 0))
3084 sb->s_flags &= ~MS_RDONLY;
3085 }
3086 }
3087 #ifdef CONFIG_QUOTA
3088 /* Release old quota file names */
3089 for (i = 0; i < MAXQUOTAS; i++)
3090 if (old_opts.s_qf_names[i] &&
3091 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3092 kfree(old_opts.s_qf_names[i]);
3093 #endif
3094 return 0;
3095 restore_opts:
3096 sb->s_flags = old_sb_flags;
3097 sbi->s_mount_opt = old_opts.s_mount_opt;
3098 sbi->s_resuid = old_opts.s_resuid;
3099 sbi->s_resgid = old_opts.s_resgid;
3100 sbi->s_commit_interval = old_opts.s_commit_interval;
3101 #ifdef CONFIG_QUOTA
3102 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3103 for (i = 0; i < MAXQUOTAS; i++) {
3104 if (sbi->s_qf_names[i] &&
3105 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3106 kfree(sbi->s_qf_names[i]);
3107 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3108 }
3109 #endif
3110 return err;
3111 }
3112
3113 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3114 {
3115 struct super_block *sb = dentry->d_sb;
3116 struct ext4_sb_info *sbi = EXT4_SB(sb);
3117 struct ext4_super_block *es = sbi->s_es;
3118 u64 fsid;
3119
3120 if (test_opt(sb, MINIX_DF)) {
3121 sbi->s_overhead_last = 0;
3122 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3123 ext4_group_t ngroups = sbi->s_groups_count, i;
3124 ext4_fsblk_t overhead = 0;
3125 smp_rmb();
3126
3127 /*
3128 * Compute the overhead (FS structures). This is constant
3129 * for a given filesystem unless the number of block groups
3130 * changes so we cache the previous value until it does.
3131 */
3132
3133 /*
3134 * All of the blocks before first_data_block are
3135 * overhead
3136 */
3137 overhead = le32_to_cpu(es->s_first_data_block);
3138
3139 /*
3140 * Add the overhead attributed to the superblock and
3141 * block group descriptors. If the sparse superblocks
3142 * feature is turned on, then not all groups have this.
3143 */
3144 for (i = 0; i < ngroups; i++) {
3145 overhead += ext4_bg_has_super(sb, i) +
3146 ext4_bg_num_gdb(sb, i);
3147 cond_resched();
3148 }
3149
3150 /*
3151 * Every block group has an inode bitmap, a block
3152 * bitmap, and an inode table.
3153 */
3154 overhead += ngroups * (2 + sbi->s_itb_per_group);
3155 sbi->s_overhead_last = overhead;
3156 smp_wmb();
3157 sbi->s_blocks_last = ext4_blocks_count(es);
3158 }
3159
3160 buf->f_type = EXT4_SUPER_MAGIC;
3161 buf->f_bsize = sb->s_blocksize;
3162 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3163 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3164 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3165 ext4_free_blocks_count_set(es, buf->f_bfree);
3166 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3167 if (buf->f_bfree < ext4_r_blocks_count(es))
3168 buf->f_bavail = 0;
3169 buf->f_files = le32_to_cpu(es->s_inodes_count);
3170 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3171 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3172 buf->f_namelen = EXT4_NAME_LEN;
3173 fsid = le64_to_cpup((void *)es->s_uuid) ^
3174 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3175 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3176 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3177 return 0;
3178 }
3179
3180 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3181 * is locked for write. Otherwise the are possible deadlocks:
3182 * Process 1 Process 2
3183 * ext4_create() quota_sync()
3184 * jbd2_journal_start() write_dquot()
3185 * DQUOT_INIT() down(dqio_mutex)
3186 * down(dqio_mutex) jbd2_journal_start()
3187 *
3188 */
3189
3190 #ifdef CONFIG_QUOTA
3191
3192 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3193 {
3194 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3195 }
3196
3197 static int ext4_dquot_initialize(struct inode *inode, int type)
3198 {
3199 handle_t *handle;
3200 int ret, err;
3201
3202 /* We may create quota structure so we need to reserve enough blocks */
3203 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3204 if (IS_ERR(handle))
3205 return PTR_ERR(handle);
3206 ret = dquot_initialize(inode, type);
3207 err = ext4_journal_stop(handle);
3208 if (!ret)
3209 ret = err;
3210 return ret;
3211 }
3212
3213 static int ext4_dquot_drop(struct inode *inode)
3214 {
3215 handle_t *handle;
3216 int ret, err;
3217
3218 /* We may delete quota structure so we need to reserve enough blocks */
3219 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3220 if (IS_ERR(handle)) {
3221 /*
3222 * We call dquot_drop() anyway to at least release references
3223 * to quota structures so that umount does not hang.
3224 */
3225 dquot_drop(inode);
3226 return PTR_ERR(handle);
3227 }
3228 ret = dquot_drop(inode);
3229 err = ext4_journal_stop(handle);
3230 if (!ret)
3231 ret = err;
3232 return ret;
3233 }
3234
3235 static int ext4_write_dquot(struct dquot *dquot)
3236 {
3237 int ret, err;
3238 handle_t *handle;
3239 struct inode *inode;
3240
3241 inode = dquot_to_inode(dquot);
3242 handle = ext4_journal_start(inode,
3243 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3244 if (IS_ERR(handle))
3245 return PTR_ERR(handle);
3246 ret = dquot_commit(dquot);
3247 err = ext4_journal_stop(handle);
3248 if (!ret)
3249 ret = err;
3250 return ret;
3251 }
3252
3253 static int ext4_acquire_dquot(struct dquot *dquot)
3254 {
3255 int ret, err;
3256 handle_t *handle;
3257
3258 handle = ext4_journal_start(dquot_to_inode(dquot),
3259 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3260 if (IS_ERR(handle))
3261 return PTR_ERR(handle);
3262 ret = dquot_acquire(dquot);
3263 err = ext4_journal_stop(handle);
3264 if (!ret)
3265 ret = err;
3266 return ret;
3267 }
3268
3269 static int ext4_release_dquot(struct dquot *dquot)
3270 {
3271 int ret, err;
3272 handle_t *handle;
3273
3274 handle = ext4_journal_start(dquot_to_inode(dquot),
3275 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3276 if (IS_ERR(handle)) {
3277 /* Release dquot anyway to avoid endless cycle in dqput() */
3278 dquot_release(dquot);
3279 return PTR_ERR(handle);
3280 }
3281 ret = dquot_release(dquot);
3282 err = ext4_journal_stop(handle);
3283 if (!ret)
3284 ret = err;
3285 return ret;
3286 }
3287
3288 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3289 {
3290 /* Are we journaling quotas? */
3291 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3292 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3293 dquot_mark_dquot_dirty(dquot);
3294 return ext4_write_dquot(dquot);
3295 } else {
3296 return dquot_mark_dquot_dirty(dquot);
3297 }
3298 }
3299
3300 static int ext4_write_info(struct super_block *sb, int type)
3301 {
3302 int ret, err;
3303 handle_t *handle;
3304
3305 /* Data block + inode block */
3306 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3307 if (IS_ERR(handle))
3308 return PTR_ERR(handle);
3309 ret = dquot_commit_info(sb, type);
3310 err = ext4_journal_stop(handle);
3311 if (!ret)
3312 ret = err;
3313 return ret;
3314 }
3315
3316 /*
3317 * Turn on quotas during mount time - we need to find
3318 * the quota file and such...
3319 */
3320 static int ext4_quota_on_mount(struct super_block *sb, int type)
3321 {
3322 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3323 EXT4_SB(sb)->s_jquota_fmt, type);
3324 }
3325
3326 /*
3327 * Standard function to be called on quota_on
3328 */
3329 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3330 char *name, int remount)
3331 {
3332 int err;
3333 struct path path;
3334
3335 if (!test_opt(sb, QUOTA))
3336 return -EINVAL;
3337 /* When remounting, no checks are needed and in fact, name is NULL */
3338 if (remount)
3339 return vfs_quota_on(sb, type, format_id, name, remount);
3340
3341 err = kern_path(name, LOOKUP_FOLLOW, &path);
3342 if (err)
3343 return err;
3344
3345 /* Quotafile not on the same filesystem? */
3346 if (path.mnt->mnt_sb != sb) {
3347 path_put(&path);
3348 return -EXDEV;
3349 }
3350 /* Journaling quota? */
3351 if (EXT4_SB(sb)->s_qf_names[type]) {
3352 /* Quotafile not in fs root? */
3353 if (path.dentry->d_parent != sb->s_root)
3354 printk(KERN_WARNING
3355 "EXT4-fs: Quota file not on filesystem root. "
3356 "Journaled quota will not work.\n");
3357 }
3358
3359 /*
3360 * When we journal data on quota file, we have to flush journal to see
3361 * all updates to the file when we bypass pagecache...
3362 */
3363 if (ext4_should_journal_data(path.dentry->d_inode)) {
3364 /*
3365 * We don't need to lock updates but journal_flush() could
3366 * otherwise be livelocked...
3367 */
3368 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3369 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3370 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3371 if (err) {
3372 path_put(&path);
3373 return err;
3374 }
3375 }
3376
3377 err = vfs_quota_on_path(sb, type, format_id, &path);
3378 path_put(&path);
3379 return err;
3380 }
3381
3382 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3383 * acquiring the locks... As quota files are never truncated and quota code
3384 * itself serializes the operations (and noone else should touch the files)
3385 * we don't have to be afraid of races */
3386 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3387 size_t len, loff_t off)
3388 {
3389 struct inode *inode = sb_dqopt(sb)->files[type];
3390 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3391 int err = 0;
3392 int offset = off & (sb->s_blocksize - 1);
3393 int tocopy;
3394 size_t toread;
3395 struct buffer_head *bh;
3396 loff_t i_size = i_size_read(inode);
3397
3398 if (off > i_size)
3399 return 0;
3400 if (off+len > i_size)
3401 len = i_size-off;
3402 toread = len;
3403 while (toread > 0) {
3404 tocopy = sb->s_blocksize - offset < toread ?
3405 sb->s_blocksize - offset : toread;
3406 bh = ext4_bread(NULL, inode, blk, 0, &err);
3407 if (err)
3408 return err;
3409 if (!bh) /* A hole? */
3410 memset(data, 0, tocopy);
3411 else
3412 memcpy(data, bh->b_data+offset, tocopy);
3413 brelse(bh);
3414 offset = 0;
3415 toread -= tocopy;
3416 data += tocopy;
3417 blk++;
3418 }
3419 return len;
3420 }
3421
3422 /* Write to quotafile (we know the transaction is already started and has
3423 * enough credits) */
3424 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3425 const char *data, size_t len, loff_t off)
3426 {
3427 struct inode *inode = sb_dqopt(sb)->files[type];
3428 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3429 int err = 0;
3430 int offset = off & (sb->s_blocksize - 1);
3431 int tocopy;
3432 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3433 size_t towrite = len;
3434 struct buffer_head *bh;
3435 handle_t *handle = journal_current_handle();
3436
3437 if (!handle) {
3438 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
3439 " cancelled because transaction is not started.\n",
3440 (unsigned long long)off, (unsigned long long)len);
3441 return -EIO;
3442 }
3443 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3444 while (towrite > 0) {
3445 tocopy = sb->s_blocksize - offset < towrite ?
3446 sb->s_blocksize - offset : towrite;
3447 bh = ext4_bread(handle, inode, blk, 1, &err);
3448 if (!bh)
3449 goto out;
3450 if (journal_quota) {
3451 err = ext4_journal_get_write_access(handle, bh);
3452 if (err) {
3453 brelse(bh);
3454 goto out;
3455 }
3456 }
3457 lock_buffer(bh);
3458 memcpy(bh->b_data+offset, data, tocopy);
3459 flush_dcache_page(bh->b_page);
3460 unlock_buffer(bh);
3461 if (journal_quota)
3462 err = ext4_journal_dirty_metadata(handle, bh);
3463 else {
3464 /* Always do at least ordered writes for quotas */
3465 err = ext4_jbd2_file_inode(handle, inode);
3466 mark_buffer_dirty(bh);
3467 }
3468 brelse(bh);
3469 if (err)
3470 goto out;
3471 offset = 0;
3472 towrite -= tocopy;
3473 data += tocopy;
3474 blk++;
3475 }
3476 out:
3477 if (len == towrite) {
3478 mutex_unlock(&inode->i_mutex);
3479 return err;
3480 }
3481 if (inode->i_size < off+len-towrite) {
3482 i_size_write(inode, off+len-towrite);
3483 EXT4_I(inode)->i_disksize = inode->i_size;
3484 }
3485 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3486 ext4_mark_inode_dirty(handle, inode);
3487 mutex_unlock(&inode->i_mutex);
3488 return len - towrite;
3489 }
3490
3491 #endif
3492
3493 static int ext4_get_sb(struct file_system_type *fs_type,
3494 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3495 {
3496 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3497 }
3498
3499 #ifdef CONFIG_PROC_FS
3500 static int ext4_ui_proc_show(struct seq_file *m, void *v)
3501 {
3502 unsigned int *p = m->private;
3503
3504 seq_printf(m, "%u\n", *p);
3505 return 0;
3506 }
3507
3508 static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3509 {
3510 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3511 }
3512
3513 static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3514 size_t cnt, loff_t *ppos)
3515 {
3516 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
3517 char str[32];
3518 unsigned long value;
3519
3520 if (cnt >= sizeof(str))
3521 return -EINVAL;
3522 if (copy_from_user(str, buf, cnt))
3523 return -EFAULT;
3524 value = simple_strtol(str, NULL, 0);
3525 if (value < 0)
3526 return -ERANGE;
3527 *p = value;
3528 return cnt;
3529 }
3530
3531 const struct file_operations ext4_ui_proc_fops = {
3532 .owner = THIS_MODULE,
3533 .open = ext4_ui_proc_open,
3534 .read = seq_read,
3535 .llseek = seq_lseek,
3536 .release = single_release,
3537 .write = ext4_ui_proc_write,
3538 };
3539 #endif
3540
3541 static struct file_system_type ext4_fs_type = {
3542 .owner = THIS_MODULE,
3543 .name = "ext4",
3544 .get_sb = ext4_get_sb,
3545 .kill_sb = kill_block_super,
3546 .fs_flags = FS_REQUIRES_DEV,
3547 };
3548
3549 #ifdef CONFIG_EXT4DEV_COMPAT
3550 static int ext4dev_get_sb(struct file_system_type *fs_type,
3551 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3552 {
3553 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3554 "to mount using ext4\n");
3555 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3556 "will go away by 2.6.31\n");
3557 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3558 }
3559
3560 static struct file_system_type ext4dev_fs_type = {
3561 .owner = THIS_MODULE,
3562 .name = "ext4dev",
3563 .get_sb = ext4dev_get_sb,
3564 .kill_sb = kill_block_super,
3565 .fs_flags = FS_REQUIRES_DEV,
3566 };
3567 MODULE_ALIAS("ext4dev");
3568 #endif
3569
3570 static int __init init_ext4_fs(void)
3571 {
3572 int err;
3573
3574 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
3575 err = init_ext4_mballoc();
3576 if (err)
3577 return err;
3578
3579 err = init_ext4_xattr();
3580 if (err)
3581 goto out2;
3582 err = init_inodecache();
3583 if (err)
3584 goto out1;
3585 err = register_filesystem(&ext4_fs_type);
3586 if (err)
3587 goto out;
3588 #ifdef CONFIG_EXT4DEV_COMPAT
3589 err = register_filesystem(&ext4dev_fs_type);
3590 if (err) {
3591 unregister_filesystem(&ext4_fs_type);
3592 goto out;
3593 }
3594 #endif
3595 return 0;
3596 out:
3597 destroy_inodecache();
3598 out1:
3599 exit_ext4_xattr();
3600 out2:
3601 exit_ext4_mballoc();
3602 return err;
3603 }
3604
3605 static void __exit exit_ext4_fs(void)
3606 {
3607 unregister_filesystem(&ext4_fs_type);
3608 #ifdef CONFIG_EXT4DEV_COMPAT
3609 unregister_filesystem(&ext4dev_fs_type);
3610 #endif
3611 destroy_inodecache();
3612 exit_ext4_xattr();
3613 exit_ext4_mballoc();
3614 remove_proc_entry("fs/ext4", NULL);
3615 }
3616
3617 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3618 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3619 MODULE_LICENSE("GPL");
3620 module_init(init_ext4_fs)
3621 module_exit(exit_ext4_fs)
Linux with added FPC-III support