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ext4: Convert s_blocks_count to s_blocks_count_lo
[linux-2.6/verdex.git] / fs / ext4 / super.c
blob11e80f061cb2877160e44be69a4548c3b4618f66
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/ext4_fs.h>
25 #include <linux/ext4_jbd2.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41
42 #include <asm/uaccess.h>
43
44 #include "xattr.h"
45 #include "acl.h"
46 #include "namei.h"
47 #include "group.h"
48
49 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
50 unsigned long journal_devnum);
51 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
52 unsigned int);
53 static void ext4_commit_super (struct super_block * sb,
54 struct ext4_super_block * es,
55 int sync);
56 static void ext4_mark_recovery_complete(struct super_block * sb,
57 struct ext4_super_block * es);
58 static void ext4_clear_journal_err(struct super_block * sb,
59 struct ext4_super_block * es);
60 static int ext4_sync_fs(struct super_block *sb, int wait);
61 static const char *ext4_decode_error(struct super_block * sb, int errno,
62 char nbuf[16]);
63 static int ext4_remount (struct super_block * sb, int * flags, char * data);
64 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
65 static void ext4_unlockfs(struct super_block *sb);
66 static void ext4_write_super (struct super_block * sb);
67 static void ext4_write_super_lockfs(struct super_block *sb);
68
69
70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
72 {
73 return le32_to_cpu(bg->bg_block_bitmap_lo) |
74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
76 }
77
78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
80 {
81 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
84 }
85
86 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
88 {
89 return le32_to_cpu(bg->bg_inode_table_lo) |
90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
92 }
93
94 void ext4_block_bitmap_set(struct super_block *sb,
95 struct ext4_group_desc *bg, ext4_fsblk_t blk)
96 {
97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
100 }
101
102 void ext4_inode_bitmap_set(struct super_block *sb,
103 struct ext4_group_desc *bg, ext4_fsblk_t blk)
104 {
105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
108 }
109
110 void ext4_inode_table_set(struct super_block *sb,
111 struct ext4_group_desc *bg, ext4_fsblk_t blk)
112 {
113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
116 }
117
118 /*
119 * Wrappers for jbd2_journal_start/end.
120 *
121 * The only special thing we need to do here is to make sure that all
122 * journal_end calls result in the superblock being marked dirty, so
123 * that sync() will call the filesystem's write_super callback if
124 * appropriate.
125 */
126 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
127 {
128 journal_t *journal;
129
130 if (sb->s_flags & MS_RDONLY)
131 return ERR_PTR(-EROFS);
132
133 /* Special case here: if the journal has aborted behind our
134 * backs (eg. EIO in the commit thread), then we still need to
135 * take the FS itself readonly cleanly. */
136 journal = EXT4_SB(sb)->s_journal;
137 if (is_journal_aborted(journal)) {
138 ext4_abort(sb, __FUNCTION__,
139 "Detected aborted journal");
140 return ERR_PTR(-EROFS);
141 }
142
143 return jbd2_journal_start(journal, nblocks);
144 }
145
146 /*
147 * The only special thing we need to do here is to make sure that all
148 * jbd2_journal_stop calls result in the superblock being marked dirty, so
149 * that sync() will call the filesystem's write_super callback if
150 * appropriate.
151 */
152 int __ext4_journal_stop(const char *where, handle_t *handle)
153 {
154 struct super_block *sb;
155 int err;
156 int rc;
157
158 sb = handle->h_transaction->t_journal->j_private;
159 err = handle->h_err;
160 rc = jbd2_journal_stop(handle);
161
162 if (!err)
163 err = rc;
164 if (err)
165 __ext4_std_error(sb, where, err);
166 return err;
167 }
168
169 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
170 struct buffer_head *bh, handle_t *handle, int err)
171 {
172 char nbuf[16];
173 const char *errstr = ext4_decode_error(NULL, err, nbuf);
174
175 if (bh)
176 BUFFER_TRACE(bh, "abort");
177
178 if (!handle->h_err)
179 handle->h_err = err;
180
181 if (is_handle_aborted(handle))
182 return;
183
184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
185 caller, errstr, err_fn);
186
187 jbd2_journal_abort_handle(handle);
188 }
189
190 /* Deal with the reporting of failure conditions on a filesystem such as
191 * inconsistencies detected or read IO failures.
192 *
193 * On ext2, we can store the error state of the filesystem in the
194 * superblock. That is not possible on ext4, because we may have other
195 * write ordering constraints on the superblock which prevent us from
196 * writing it out straight away; and given that the journal is about to
197 * be aborted, we can't rely on the current, or future, transactions to
198 * write out the superblock safely.
199 *
200 * We'll just use the jbd2_journal_abort() error code to record an error in
201 * the journal instead. On recovery, the journal will compain about
202 * that error until we've noted it down and cleared it.
203 */
204
205 static void ext4_handle_error(struct super_block *sb)
206 {
207 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
208
209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
211
212 if (sb->s_flags & MS_RDONLY)
213 return;
214
215 if (!test_opt (sb, ERRORS_CONT)) {
216 journal_t *journal = EXT4_SB(sb)->s_journal;
217
218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
219 if (journal)
220 jbd2_journal_abort(journal, -EIO);
221 }
222 if (test_opt (sb, ERRORS_RO)) {
223 printk (KERN_CRIT "Remounting filesystem read-only\n");
224 sb->s_flags |= MS_RDONLY;
225 }
226 ext4_commit_super(sb, es, 1);
227 if (test_opt(sb, ERRORS_PANIC))
228 panic("EXT4-fs (device %s): panic forced after error\n",
229 sb->s_id);
230 }
231
232 void ext4_error (struct super_block * sb, const char * function,
233 const char * fmt, ...)
234 {
235 va_list args;
236
237 va_start(args, fmt);
238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
239 vprintk(fmt, args);
240 printk("\n");
241 va_end(args);
242
243 ext4_handle_error(sb);
244 }
245
246 static const char *ext4_decode_error(struct super_block * sb, int errno,
247 char nbuf[16])
248 {
249 char *errstr = NULL;
250
251 switch (errno) {
252 case -EIO:
253 errstr = "IO failure";
254 break;
255 case -ENOMEM:
256 errstr = "Out of memory";
257 break;
258 case -EROFS:
259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
260 errstr = "Journal has aborted";
261 else
262 errstr = "Readonly filesystem";
263 break;
264 default:
265 /* If the caller passed in an extra buffer for unknown
266 * errors, textualise them now. Else we just return
267 * NULL. */
268 if (nbuf) {
269 /* Check for truncated error codes... */
270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
271 errstr = nbuf;
272 }
273 break;
274 }
275
276 return errstr;
277 }
278
279 /* __ext4_std_error decodes expected errors from journaling functions
280 * automatically and invokes the appropriate error response. */
281
282 void __ext4_std_error (struct super_block * sb, const char * function,
283 int errno)
284 {
285 char nbuf[16];
286 const char *errstr;
287
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
290 * an error. */
291 if (errno == -EROFS && journal_current_handle() == NULL &&
292 (sb->s_flags & MS_RDONLY))
293 return;
294
295 errstr = ext4_decode_error(sb, errno, nbuf);
296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
297 sb->s_id, function, errstr);
298
299 ext4_handle_error(sb);
300 }
301
302 /*
303 * ext4_abort is a much stronger failure handler than ext4_error. The
304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
306 *
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
310 */
311
312 void ext4_abort (struct super_block * sb, const char * function,
313 const char * fmt, ...)
314 {
315 va_list args;
316
317 printk (KERN_CRIT "ext4_abort called.\n");
318
319 va_start(args, fmt);
320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
326 panic("EXT4-fs panic from previous error\n");
327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
333 sb->s_flags |= MS_RDONLY;
334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
336 }
337
338 void ext4_warning (struct super_block * sb, const char * function,
339 const char * fmt, ...)
340 {
341 va_list args;
342
343 va_start(args, fmt);
344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349 }
350
351 void ext4_update_dynamic_rev(struct super_block *sb)
352 {
353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
354
355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
356 return;
357
358 ext4_warning(sb, __FUNCTION__,
359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
361 EXT4_DYNAMIC_REV);
362
363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
368
369 /*
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
373 */
374 }
375
376 /*
377 * Open the external journal device
378 */
379 static struct block_device *ext4_blkdev_get(dev_t dev)
380 {
381 struct block_device *bdev;
382 char b[BDEVNAME_SIZE];
383
384 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
385 if (IS_ERR(bdev))
386 goto fail;
387 return bdev;
388
389 fail:
390 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
391 __bdevname(dev, b), PTR_ERR(bdev));
392 return NULL;
393 }
394
395 /*
396 * Release the journal device
397 */
398 static int ext4_blkdev_put(struct block_device *bdev)
399 {
400 bd_release(bdev);
401 return blkdev_put(bdev);
402 }
403
404 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
405 {
406 struct block_device *bdev;
407 int ret = -ENODEV;
408
409 bdev = sbi->journal_bdev;
410 if (bdev) {
411 ret = ext4_blkdev_put(bdev);
412 sbi->journal_bdev = NULL;
413 }
414 return ret;
415 }
416
417 static inline struct inode *orphan_list_entry(struct list_head *l)
418 {
419 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
420 }
421
422 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
423 {
424 struct list_head *l;
425
426 printk(KERN_ERR "sb orphan head is %d\n",
427 le32_to_cpu(sbi->s_es->s_last_orphan));
428
429 printk(KERN_ERR "sb_info orphan list:\n");
430 list_for_each(l, &sbi->s_orphan) {
431 struct inode *inode = orphan_list_entry(l);
432 printk(KERN_ERR " "
433 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
434 inode->i_sb->s_id, inode->i_ino, inode,
435 inode->i_mode, inode->i_nlink,
436 NEXT_ORPHAN(inode));
437 }
438 }
439
440 static void ext4_put_super (struct super_block * sb)
441 {
442 struct ext4_sb_info *sbi = EXT4_SB(sb);
443 struct ext4_super_block *es = sbi->s_es;
444 int i;
445
446 ext4_ext_release(sb);
447 ext4_xattr_put_super(sb);
448 jbd2_journal_destroy(sbi->s_journal);
449 if (!(sb->s_flags & MS_RDONLY)) {
450 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
451 es->s_state = cpu_to_le16(sbi->s_mount_state);
452 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
453 mark_buffer_dirty(sbi->s_sbh);
454 ext4_commit_super(sb, es, 1);
455 }
456
457 for (i = 0; i < sbi->s_gdb_count; i++)
458 brelse(sbi->s_group_desc[i]);
459 kfree(sbi->s_group_desc);
460 percpu_counter_destroy(&sbi->s_freeblocks_counter);
461 percpu_counter_destroy(&sbi->s_freeinodes_counter);
462 percpu_counter_destroy(&sbi->s_dirs_counter);
463 brelse(sbi->s_sbh);
464 #ifdef CONFIG_QUOTA
465 for (i = 0; i < MAXQUOTAS; i++)
466 kfree(sbi->s_qf_names[i]);
467 #endif
468
469 /* Debugging code just in case the in-memory inode orphan list
470 * isn't empty. The on-disk one can be non-empty if we've
471 * detected an error and taken the fs readonly, but the
472 * in-memory list had better be clean by this point. */
473 if (!list_empty(&sbi->s_orphan))
474 dump_orphan_list(sb, sbi);
475 J_ASSERT(list_empty(&sbi->s_orphan));
476
477 invalidate_bdev(sb->s_bdev);
478 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
479 /*
480 * Invalidate the journal device's buffers. We don't want them
481 * floating about in memory - the physical journal device may
482 * hotswapped, and it breaks the `ro-after' testing code.
483 */
484 sync_blockdev(sbi->journal_bdev);
485 invalidate_bdev(sbi->journal_bdev);
486 ext4_blkdev_remove(sbi);
487 }
488 sb->s_fs_info = NULL;
489 kfree(sbi);
490 return;
491 }
492
493 static struct kmem_cache *ext4_inode_cachep;
494
495 /*
496 * Called inside transaction, so use GFP_NOFS
497 */
498 static struct inode *ext4_alloc_inode(struct super_block *sb)
499 {
500 struct ext4_inode_info *ei;
501
502 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
503 if (!ei)
504 return NULL;
505 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
506 ei->i_acl = EXT4_ACL_NOT_CACHED;
507 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
508 #endif
509 ei->i_block_alloc_info = NULL;
510 ei->vfs_inode.i_version = 1;
511 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
512 return &ei->vfs_inode;
513 }
514
515 static void ext4_destroy_inode(struct inode *inode)
516 {
517 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
518 printk("EXT4 Inode %p: orphan list check failed!\n",
519 EXT4_I(inode));
520 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
521 EXT4_I(inode), sizeof(struct ext4_inode_info),
522 true);
523 dump_stack();
524 }
525 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
526 }
527
528 static void init_once(struct kmem_cache *cachep, void *foo)
529 {
530 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
531
532 INIT_LIST_HEAD(&ei->i_orphan);
533 #ifdef CONFIG_EXT4DEV_FS_XATTR
534 init_rwsem(&ei->xattr_sem);
535 #endif
536 mutex_init(&ei->truncate_mutex);
537 inode_init_once(&ei->vfs_inode);
538 }
539
540 static int init_inodecache(void)
541 {
542 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
543 sizeof(struct ext4_inode_info),
544 0, (SLAB_RECLAIM_ACCOUNT|
545 SLAB_MEM_SPREAD),
546 init_once);
547 if (ext4_inode_cachep == NULL)
548 return -ENOMEM;
549 return 0;
550 }
551
552 static void destroy_inodecache(void)
553 {
554 kmem_cache_destroy(ext4_inode_cachep);
555 }
556
557 static void ext4_clear_inode(struct inode *inode)
558 {
559 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
560 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
561 if (EXT4_I(inode)->i_acl &&
562 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
563 posix_acl_release(EXT4_I(inode)->i_acl);
564 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
565 }
566 if (EXT4_I(inode)->i_default_acl &&
567 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
568 posix_acl_release(EXT4_I(inode)->i_default_acl);
569 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
570 }
571 #endif
572 ext4_discard_reservation(inode);
573 EXT4_I(inode)->i_block_alloc_info = NULL;
574 if (unlikely(rsv))
575 kfree(rsv);
576 }
577
578 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
579 {
580 #if defined(CONFIG_QUOTA)
581 struct ext4_sb_info *sbi = EXT4_SB(sb);
582
583 if (sbi->s_jquota_fmt)
584 seq_printf(seq, ",jqfmt=%s",
585 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
586
587 if (sbi->s_qf_names[USRQUOTA])
588 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
589
590 if (sbi->s_qf_names[GRPQUOTA])
591 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
592
593 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
594 seq_puts(seq, ",usrquota");
595
596 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
597 seq_puts(seq, ",grpquota");
598 #endif
599 }
600
601 /*
602 * Show an option if
603 * - it's set to a non-default value OR
604 * - if the per-sb default is different from the global default
605 */
606 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
607 {
608 struct super_block *sb = vfs->mnt_sb;
609 struct ext4_sb_info *sbi = EXT4_SB(sb);
610 struct ext4_super_block *es = sbi->s_es;
611 unsigned long def_mount_opts;
612
613 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
614
615 if (sbi->s_sb_block != 1)
616 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
617 if (test_opt(sb, MINIX_DF))
618 seq_puts(seq, ",minixdf");
619 if (test_opt(sb, GRPID))
620 seq_puts(seq, ",grpid");
621 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
622 seq_puts(seq, ",nogrpid");
623 if (sbi->s_resuid != EXT4_DEF_RESUID ||
624 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
625 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
626 }
627 if (sbi->s_resgid != EXT4_DEF_RESGID ||
628 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
629 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
630 }
631 if (test_opt(sb, ERRORS_CONT)) {
632 int def_errors = le16_to_cpu(es->s_errors);
633
634 if (def_errors == EXT4_ERRORS_PANIC ||
635 def_errors == EXT4_ERRORS_RO) {
636 seq_puts(seq, ",errors=continue");
637 }
638 }
639 if (test_opt(sb, ERRORS_RO))
640 seq_puts(seq, ",errors=remount-ro");
641 if (test_opt(sb, ERRORS_PANIC))
642 seq_puts(seq, ",errors=panic");
643 if (test_opt(sb, NO_UID32))
644 seq_puts(seq, ",nouid32");
645 if (test_opt(sb, DEBUG))
646 seq_puts(seq, ",debug");
647 if (test_opt(sb, OLDALLOC))
648 seq_puts(seq, ",oldalloc");
649 #ifdef CONFIG_EXT4_FS_XATTR
650 if (test_opt(sb, XATTR_USER))
651 seq_puts(seq, ",user_xattr");
652 if (!test_opt(sb, XATTR_USER) &&
653 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
654 seq_puts(seq, ",nouser_xattr");
655 }
656 #endif
657 #ifdef CONFIG_EXT4_FS_POSIX_ACL
658 if (test_opt(sb, POSIX_ACL))
659 seq_puts(seq, ",acl");
660 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
661 seq_puts(seq, ",noacl");
662 #endif
663 if (!test_opt(sb, RESERVATION))
664 seq_puts(seq, ",noreservation");
665 if (sbi->s_commit_interval) {
666 seq_printf(seq, ",commit=%u",
667 (unsigned) (sbi->s_commit_interval / HZ));
668 }
669 if (test_opt(sb, BARRIER))
670 seq_puts(seq, ",barrier=1");
671 if (test_opt(sb, NOBH))
672 seq_puts(seq, ",nobh");
673 if (!test_opt(sb, EXTENTS))
674 seq_puts(seq, ",noextents");
675
676 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
677 seq_puts(seq, ",data=journal");
678 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
679 seq_puts(seq, ",data=ordered");
680 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
681 seq_puts(seq, ",data=writeback");
682
683 ext4_show_quota_options(seq, sb);
684
685 return 0;
686 }
687
688
689 static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
690 {
691 __u32 *objp = vobjp;
692 unsigned long ino = objp[0];
693 __u32 generation = objp[1];
694 struct inode *inode;
695 struct dentry *result;
696
697 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
698 return ERR_PTR(-ESTALE);
699 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
700 return ERR_PTR(-ESTALE);
701
702 /* iget isn't really right if the inode is currently unallocated!!
703 *
704 * ext4_read_inode will return a bad_inode if the inode had been
705 * deleted, so we should be safe.
706 *
707 * Currently we don't know the generation for parent directory, so
708 * a generation of 0 means "accept any"
709 */
710 inode = iget(sb, ino);
711 if (inode == NULL)
712 return ERR_PTR(-ENOMEM);
713 if (is_bad_inode(inode) ||
714 (generation && inode->i_generation != generation)) {
715 iput(inode);
716 return ERR_PTR(-ESTALE);
717 }
718 /* now to find a dentry.
719 * If possible, get a well-connected one
720 */
721 result = d_alloc_anon(inode);
722 if (!result) {
723 iput(inode);
724 return ERR_PTR(-ENOMEM);
725 }
726 return result;
727 }
728
729 #ifdef CONFIG_QUOTA
730 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
731 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
732
733 static int ext4_dquot_initialize(struct inode *inode, int type);
734 static int ext4_dquot_drop(struct inode *inode);
735 static int ext4_write_dquot(struct dquot *dquot);
736 static int ext4_acquire_dquot(struct dquot *dquot);
737 static int ext4_release_dquot(struct dquot *dquot);
738 static int ext4_mark_dquot_dirty(struct dquot *dquot);
739 static int ext4_write_info(struct super_block *sb, int type);
740 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
741 static int ext4_quota_on_mount(struct super_block *sb, int type);
742 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
743 size_t len, loff_t off);
744 static ssize_t ext4_quota_write(struct super_block *sb, int type,
745 const char *data, size_t len, loff_t off);
746
747 static struct dquot_operations ext4_quota_operations = {
748 .initialize = ext4_dquot_initialize,
749 .drop = ext4_dquot_drop,
750 .alloc_space = dquot_alloc_space,
751 .alloc_inode = dquot_alloc_inode,
752 .free_space = dquot_free_space,
753 .free_inode = dquot_free_inode,
754 .transfer = dquot_transfer,
755 .write_dquot = ext4_write_dquot,
756 .acquire_dquot = ext4_acquire_dquot,
757 .release_dquot = ext4_release_dquot,
758 .mark_dirty = ext4_mark_dquot_dirty,
759 .write_info = ext4_write_info
760 };
761
762 static struct quotactl_ops ext4_qctl_operations = {
763 .quota_on = ext4_quota_on,
764 .quota_off = vfs_quota_off,
765 .quota_sync = vfs_quota_sync,
766 .get_info = vfs_get_dqinfo,
767 .set_info = vfs_set_dqinfo,
768 .get_dqblk = vfs_get_dqblk,
769 .set_dqblk = vfs_set_dqblk
770 };
771 #endif
772
773 static const struct super_operations ext4_sops = {
774 .alloc_inode = ext4_alloc_inode,
775 .destroy_inode = ext4_destroy_inode,
776 .read_inode = ext4_read_inode,
777 .write_inode = ext4_write_inode,
778 .dirty_inode = ext4_dirty_inode,
779 .delete_inode = ext4_delete_inode,
780 .put_super = ext4_put_super,
781 .write_super = ext4_write_super,
782 .sync_fs = ext4_sync_fs,
783 .write_super_lockfs = ext4_write_super_lockfs,
784 .unlockfs = ext4_unlockfs,
785 .statfs = ext4_statfs,
786 .remount_fs = ext4_remount,
787 .clear_inode = ext4_clear_inode,
788 .show_options = ext4_show_options,
789 #ifdef CONFIG_QUOTA
790 .quota_read = ext4_quota_read,
791 .quota_write = ext4_quota_write,
792 #endif
793 };
794
795 static struct export_operations ext4_export_ops = {
796 .get_parent = ext4_get_parent,
797 .get_dentry = ext4_get_dentry,
798 };
799
800 enum {
801 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
802 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
803 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
804 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
805 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
806 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
807 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
808 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
809 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
810 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
811 Opt_grpquota, Opt_extents, Opt_noextents,
812 };
813
814 static match_table_t tokens = {
815 {Opt_bsd_df, "bsddf"},
816 {Opt_minix_df, "minixdf"},
817 {Opt_grpid, "grpid"},
818 {Opt_grpid, "bsdgroups"},
819 {Opt_nogrpid, "nogrpid"},
820 {Opt_nogrpid, "sysvgroups"},
821 {Opt_resgid, "resgid=%u"},
822 {Opt_resuid, "resuid=%u"},
823 {Opt_sb, "sb=%u"},
824 {Opt_err_cont, "errors=continue"},
825 {Opt_err_panic, "errors=panic"},
826 {Opt_err_ro, "errors=remount-ro"},
827 {Opt_nouid32, "nouid32"},
828 {Opt_nocheck, "nocheck"},
829 {Opt_nocheck, "check=none"},
830 {Opt_debug, "debug"},
831 {Opt_oldalloc, "oldalloc"},
832 {Opt_orlov, "orlov"},
833 {Opt_user_xattr, "user_xattr"},
834 {Opt_nouser_xattr, "nouser_xattr"},
835 {Opt_acl, "acl"},
836 {Opt_noacl, "noacl"},
837 {Opt_reservation, "reservation"},
838 {Opt_noreservation, "noreservation"},
839 {Opt_noload, "noload"},
840 {Opt_nobh, "nobh"},
841 {Opt_bh, "bh"},
842 {Opt_commit, "commit=%u"},
843 {Opt_journal_update, "journal=update"},
844 {Opt_journal_inum, "journal=%u"},
845 {Opt_journal_dev, "journal_dev=%u"},
846 {Opt_abort, "abort"},
847 {Opt_data_journal, "data=journal"},
848 {Opt_data_ordered, "data=ordered"},
849 {Opt_data_writeback, "data=writeback"},
850 {Opt_offusrjquota, "usrjquota="},
851 {Opt_usrjquota, "usrjquota=%s"},
852 {Opt_offgrpjquota, "grpjquota="},
853 {Opt_grpjquota, "grpjquota=%s"},
854 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
855 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
856 {Opt_grpquota, "grpquota"},
857 {Opt_noquota, "noquota"},
858 {Opt_quota, "quota"},
859 {Opt_usrquota, "usrquota"},
860 {Opt_barrier, "barrier=%u"},
861 {Opt_extents, "extents"},
862 {Opt_noextents, "noextents"},
863 {Opt_err, NULL},
864 {Opt_resize, "resize"},
865 };
866
867 static ext4_fsblk_t get_sb_block(void **data)
868 {
869 ext4_fsblk_t sb_block;
870 char *options = (char *) *data;
871
872 if (!options || strncmp(options, "sb=", 3) != 0)
873 return 1; /* Default location */
874 options += 3;
875 /*todo: use simple_strtoll with >32bit ext4 */
876 sb_block = simple_strtoul(options, &options, 0);
877 if (*options && *options != ',') {
878 printk("EXT4-fs: Invalid sb specification: %s\n",
879 (char *) *data);
880 return 1;
881 }
882 if (*options == ',')
883 options++;
884 *data = (void *) options;
885 return sb_block;
886 }
887
888 static int parse_options (char *options, struct super_block *sb,
889 unsigned int *inum, unsigned long *journal_devnum,
890 ext4_fsblk_t *n_blocks_count, int is_remount)
891 {
892 struct ext4_sb_info *sbi = EXT4_SB(sb);
893 char * p;
894 substring_t args[MAX_OPT_ARGS];
895 int data_opt = 0;
896 int option;
897 #ifdef CONFIG_QUOTA
898 int qtype;
899 char *qname;
900 #endif
901
902 if (!options)
903 return 1;
904
905 while ((p = strsep (&options, ",")) != NULL) {
906 int token;
907 if (!*p)
908 continue;
909
910 token = match_token(p, tokens, args);
911 switch (token) {
912 case Opt_bsd_df:
913 clear_opt (sbi->s_mount_opt, MINIX_DF);
914 break;
915 case Opt_minix_df:
916 set_opt (sbi->s_mount_opt, MINIX_DF);
917 break;
918 case Opt_grpid:
919 set_opt (sbi->s_mount_opt, GRPID);
920 break;
921 case Opt_nogrpid:
922 clear_opt (sbi->s_mount_opt, GRPID);
923 break;
924 case Opt_resuid:
925 if (match_int(&args[0], &option))
926 return 0;
927 sbi->s_resuid = option;
928 break;
929 case Opt_resgid:
930 if (match_int(&args[0], &option))
931 return 0;
932 sbi->s_resgid = option;
933 break;
934 case Opt_sb:
935 /* handled by get_sb_block() instead of here */
936 /* *sb_block = match_int(&args[0]); */
937 break;
938 case Opt_err_panic:
939 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
940 clear_opt (sbi->s_mount_opt, ERRORS_RO);
941 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
942 break;
943 case Opt_err_ro:
944 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
945 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
946 set_opt (sbi->s_mount_opt, ERRORS_RO);
947 break;
948 case Opt_err_cont:
949 clear_opt (sbi->s_mount_opt, ERRORS_RO);
950 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
951 set_opt (sbi->s_mount_opt, ERRORS_CONT);
952 break;
953 case Opt_nouid32:
954 set_opt (sbi->s_mount_opt, NO_UID32);
955 break;
956 case Opt_nocheck:
957 clear_opt (sbi->s_mount_opt, CHECK);
958 break;
959 case Opt_debug:
960 set_opt (sbi->s_mount_opt, DEBUG);
961 break;
962 case Opt_oldalloc:
963 set_opt (sbi->s_mount_opt, OLDALLOC);
964 break;
965 case Opt_orlov:
966 clear_opt (sbi->s_mount_opt, OLDALLOC);
967 break;
968 #ifdef CONFIG_EXT4DEV_FS_XATTR
969 case Opt_user_xattr:
970 set_opt (sbi->s_mount_opt, XATTR_USER);
971 break;
972 case Opt_nouser_xattr:
973 clear_opt (sbi->s_mount_opt, XATTR_USER);
974 break;
975 #else
976 case Opt_user_xattr:
977 case Opt_nouser_xattr:
978 printk("EXT4 (no)user_xattr options not supported\n");
979 break;
980 #endif
981 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
982 case Opt_acl:
983 set_opt(sbi->s_mount_opt, POSIX_ACL);
984 break;
985 case Opt_noacl:
986 clear_opt(sbi->s_mount_opt, POSIX_ACL);
987 break;
988 #else
989 case Opt_acl:
990 case Opt_noacl:
991 printk("EXT4 (no)acl options not supported\n");
992 break;
993 #endif
994 case Opt_reservation:
995 set_opt(sbi->s_mount_opt, RESERVATION);
996 break;
997 case Opt_noreservation:
998 clear_opt(sbi->s_mount_opt, RESERVATION);
999 break;
1000 case Opt_journal_update:
1001 /* @@@ FIXME */
1002 /* Eventually we will want to be able to create
1003 a journal file here. For now, only allow the
1004 user to specify an existing inode to be the
1005 journal file. */
1006 if (is_remount) {
1007 printk(KERN_ERR "EXT4-fs: cannot specify "
1008 "journal on remount\n");
1009 return 0;
1010 }
1011 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1012 break;
1013 case Opt_journal_inum:
1014 if (is_remount) {
1015 printk(KERN_ERR "EXT4-fs: cannot specify "
1016 "journal on remount\n");
1017 return 0;
1018 }
1019 if (match_int(&args[0], &option))
1020 return 0;
1021 *inum = option;
1022 break;
1023 case Opt_journal_dev:
1024 if (is_remount) {
1025 printk(KERN_ERR "EXT4-fs: cannot specify "
1026 "journal on remount\n");
1027 return 0;
1028 }
1029 if (match_int(&args[0], &option))
1030 return 0;
1031 *journal_devnum = option;
1032 break;
1033 case Opt_noload:
1034 set_opt (sbi->s_mount_opt, NOLOAD);
1035 break;
1036 case Opt_commit:
1037 if (match_int(&args[0], &option))
1038 return 0;
1039 if (option < 0)
1040 return 0;
1041 if (option == 0)
1042 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1043 sbi->s_commit_interval = HZ * option;
1044 break;
1045 case Opt_data_journal:
1046 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1047 goto datacheck;
1048 case Opt_data_ordered:
1049 data_opt = EXT4_MOUNT_ORDERED_DATA;
1050 goto datacheck;
1051 case Opt_data_writeback:
1052 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1053 datacheck:
1054 if (is_remount) {
1055 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1056 != data_opt) {
1057 printk(KERN_ERR
1058 "EXT4-fs: cannot change data "
1059 "mode on remount\n");
1060 return 0;
1061 }
1062 } else {
1063 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1064 sbi->s_mount_opt |= data_opt;
1065 }
1066 break;
1067 #ifdef CONFIG_QUOTA
1068 case Opt_usrjquota:
1069 qtype = USRQUOTA;
1070 goto set_qf_name;
1071 case Opt_grpjquota:
1072 qtype = GRPQUOTA;
1073 set_qf_name:
1074 if (sb_any_quota_enabled(sb)) {
1075 printk(KERN_ERR
1076 "EXT4-fs: Cannot change journalled "
1077 "quota options when quota turned on.\n");
1078 return 0;
1079 }
1080 qname = match_strdup(&args[0]);
1081 if (!qname) {
1082 printk(KERN_ERR
1083 "EXT4-fs: not enough memory for "
1084 "storing quotafile name.\n");
1085 return 0;
1086 }
1087 if (sbi->s_qf_names[qtype] &&
1088 strcmp(sbi->s_qf_names[qtype], qname)) {
1089 printk(KERN_ERR
1090 "EXT4-fs: %s quota file already "
1091 "specified.\n", QTYPE2NAME(qtype));
1092 kfree(qname);
1093 return 0;
1094 }
1095 sbi->s_qf_names[qtype] = qname;
1096 if (strchr(sbi->s_qf_names[qtype], '/')) {
1097 printk(KERN_ERR
1098 "EXT4-fs: quotafile must be on "
1099 "filesystem root.\n");
1100 kfree(sbi->s_qf_names[qtype]);
1101 sbi->s_qf_names[qtype] = NULL;
1102 return 0;
1103 }
1104 set_opt(sbi->s_mount_opt, QUOTA);
1105 break;
1106 case Opt_offusrjquota:
1107 qtype = USRQUOTA;
1108 goto clear_qf_name;
1109 case Opt_offgrpjquota:
1110 qtype = GRPQUOTA;
1111 clear_qf_name:
1112 if (sb_any_quota_enabled(sb)) {
1113 printk(KERN_ERR "EXT4-fs: Cannot change "
1114 "journalled quota options when "
1115 "quota turned on.\n");
1116 return 0;
1117 }
1118 /*
1119 * The space will be released later when all options
1120 * are confirmed to be correct
1121 */
1122 sbi->s_qf_names[qtype] = NULL;
1123 break;
1124 case Opt_jqfmt_vfsold:
1125 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1126 break;
1127 case Opt_jqfmt_vfsv0:
1128 sbi->s_jquota_fmt = QFMT_VFS_V0;
1129 break;
1130 case Opt_quota:
1131 case Opt_usrquota:
1132 set_opt(sbi->s_mount_opt, QUOTA);
1133 set_opt(sbi->s_mount_opt, USRQUOTA);
1134 break;
1135 case Opt_grpquota:
1136 set_opt(sbi->s_mount_opt, QUOTA);
1137 set_opt(sbi->s_mount_opt, GRPQUOTA);
1138 break;
1139 case Opt_noquota:
1140 if (sb_any_quota_enabled(sb)) {
1141 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1142 "options when quota turned on.\n");
1143 return 0;
1144 }
1145 clear_opt(sbi->s_mount_opt, QUOTA);
1146 clear_opt(sbi->s_mount_opt, USRQUOTA);
1147 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1148 break;
1149 #else
1150 case Opt_quota:
1151 case Opt_usrquota:
1152 case Opt_grpquota:
1153 case Opt_usrjquota:
1154 case Opt_grpjquota:
1155 case Opt_offusrjquota:
1156 case Opt_offgrpjquota:
1157 case Opt_jqfmt_vfsold:
1158 case Opt_jqfmt_vfsv0:
1159 printk(KERN_ERR
1160 "EXT4-fs: journalled quota options not "
1161 "supported.\n");
1162 break;
1163 case Opt_noquota:
1164 break;
1165 #endif
1166 case Opt_abort:
1167 set_opt(sbi->s_mount_opt, ABORT);
1168 break;
1169 case Opt_barrier:
1170 if (match_int(&args[0], &option))
1171 return 0;
1172 if (option)
1173 set_opt(sbi->s_mount_opt, BARRIER);
1174 else
1175 clear_opt(sbi->s_mount_opt, BARRIER);
1176 break;
1177 case Opt_ignore:
1178 break;
1179 case Opt_resize:
1180 if (!is_remount) {
1181 printk("EXT4-fs: resize option only available "
1182 "for remount\n");
1183 return 0;
1184 }
1185 if (match_int(&args[0], &option) != 0)
1186 return 0;
1187 *n_blocks_count = option;
1188 break;
1189 case Opt_nobh:
1190 set_opt(sbi->s_mount_opt, NOBH);
1191 break;
1192 case Opt_bh:
1193 clear_opt(sbi->s_mount_opt, NOBH);
1194 break;
1195 case Opt_extents:
1196 set_opt (sbi->s_mount_opt, EXTENTS);
1197 break;
1198 case Opt_noextents:
1199 clear_opt (sbi->s_mount_opt, EXTENTS);
1200 break;
1201 default:
1202 printk (KERN_ERR
1203 "EXT4-fs: Unrecognized mount option \"%s\" "
1204 "or missing value\n", p);
1205 return 0;
1206 }
1207 }
1208 #ifdef CONFIG_QUOTA
1209 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1210 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1211 sbi->s_qf_names[USRQUOTA])
1212 clear_opt(sbi->s_mount_opt, USRQUOTA);
1213
1214 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1215 sbi->s_qf_names[GRPQUOTA])
1216 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1217
1218 if ((sbi->s_qf_names[USRQUOTA] &&
1219 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1220 (sbi->s_qf_names[GRPQUOTA] &&
1221 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1222 printk(KERN_ERR "EXT4-fs: old and new quota "
1223 "format mixing.\n");
1224 return 0;
1225 }
1226
1227 if (!sbi->s_jquota_fmt) {
1228 printk(KERN_ERR "EXT4-fs: journalled quota format "
1229 "not specified.\n");
1230 return 0;
1231 }
1232 } else {
1233 if (sbi->s_jquota_fmt) {
1234 printk(KERN_ERR "EXT4-fs: journalled quota format "
1235 "specified with no journalling "
1236 "enabled.\n");
1237 return 0;
1238 }
1239 }
1240 #endif
1241 return 1;
1242 }
1243
1244 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1245 int read_only)
1246 {
1247 struct ext4_sb_info *sbi = EXT4_SB(sb);
1248 int res = 0;
1249
1250 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1251 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1252 "forcing read-only mode\n");
1253 res = MS_RDONLY;
1254 }
1255 if (read_only)
1256 return res;
1257 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1258 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1259 "running e2fsck is recommended\n");
1260 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1261 printk (KERN_WARNING
1262 "EXT4-fs warning: mounting fs with errors, "
1263 "running e2fsck is recommended\n");
1264 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1265 le16_to_cpu(es->s_mnt_count) >=
1266 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1267 printk (KERN_WARNING
1268 "EXT4-fs warning: maximal mount count reached, "
1269 "running e2fsck is recommended\n");
1270 else if (le32_to_cpu(es->s_checkinterval) &&
1271 (le32_to_cpu(es->s_lastcheck) +
1272 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1273 printk (KERN_WARNING
1274 "EXT4-fs warning: checktime reached, "
1275 "running e2fsck is recommended\n");
1276 #if 0
1277 /* @@@ We _will_ want to clear the valid bit if we find
1278 * inconsistencies, to force a fsck at reboot. But for
1279 * a plain journaled filesystem we can keep it set as
1280 * valid forever! :)
1281 */
1282 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1283 #endif
1284 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1285 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1286 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1287 es->s_mtime = cpu_to_le32(get_seconds());
1288 ext4_update_dynamic_rev(sb);
1289 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1290
1291 ext4_commit_super(sb, es, 1);
1292 if (test_opt(sb, DEBUG))
1293 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1294 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1295 sb->s_blocksize,
1296 sbi->s_groups_count,
1297 EXT4_BLOCKS_PER_GROUP(sb),
1298 EXT4_INODES_PER_GROUP(sb),
1299 sbi->s_mount_opt);
1300
1301 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1302 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1303 char b[BDEVNAME_SIZE];
1304
1305 printk("external journal on %s\n",
1306 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1307 } else {
1308 printk("internal journal\n");
1309 }
1310 return res;
1311 }
1312
1313 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1314 struct ext4_group_desc *gdp)
1315 {
1316 __u16 crc = 0;
1317
1318 if (sbi->s_es->s_feature_ro_compat &
1319 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1320 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1321 __le32 le_group = cpu_to_le32(block_group);
1322
1323 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1324 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1325 crc = crc16(crc, (__u8 *)gdp, offset);
1326 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1327 /* for checksum of struct ext4_group_desc do the rest...*/
1328 if ((sbi->s_es->s_feature_incompat &
1329 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1330 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1331 crc = crc16(crc, (__u8 *)gdp + offset,
1332 le16_to_cpu(sbi->s_es->s_desc_size) -
1333 offset);
1334 }
1335
1336 return cpu_to_le16(crc);
1337 }
1338
1339 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1340 struct ext4_group_desc *gdp)
1341 {
1342 if ((sbi->s_es->s_feature_ro_compat &
1343 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1344 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1345 return 0;
1346
1347 return 1;
1348 }
1349
1350 /* Called at mount-time, super-block is locked */
1351 static int ext4_check_descriptors (struct super_block * sb)
1352 {
1353 struct ext4_sb_info *sbi = EXT4_SB(sb);
1354 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1355 ext4_fsblk_t last_block;
1356 ext4_fsblk_t block_bitmap;
1357 ext4_fsblk_t inode_bitmap;
1358 ext4_fsblk_t inode_table;
1359 struct ext4_group_desc * gdp = NULL;
1360 int desc_block = 0;
1361 int flexbg_flag = 0;
1362 int i;
1363
1364 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1365 flexbg_flag = 1;
1366
1367 ext4_debug ("Checking group descriptors");
1368
1369 for (i = 0; i < sbi->s_groups_count; i++)
1370 {
1371 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1372 last_block = ext4_blocks_count(sbi->s_es) - 1;
1373 else
1374 last_block = first_block +
1375 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1376
1377 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1378 gdp = (struct ext4_group_desc *)
1379 sbi->s_group_desc[desc_block++]->b_data;
1380 block_bitmap = ext4_block_bitmap(sb, gdp);
1381 if (block_bitmap < first_block || block_bitmap > last_block)
1382 {
1383 ext4_error (sb, "ext4_check_descriptors",
1384 "Block bitmap for group %d"
1385 " not in group (block %llu)!",
1386 i, block_bitmap);
1387 return 0;
1388 }
1389 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1390 if (inode_bitmap < first_block || inode_bitmap > last_block)
1391 {
1392 ext4_error (sb, "ext4_check_descriptors",
1393 "Inode bitmap for group %d"
1394 " not in group (block %llu)!",
1395 i, inode_bitmap);
1396 return 0;
1397 }
1398 inode_table = ext4_inode_table(sb, gdp);
1399 if (inode_table < first_block ||
1400 inode_table + sbi->s_itb_per_group - 1 > last_block)
1401 {
1402 ext4_error (sb, "ext4_check_descriptors",
1403 "Inode table for group %d"
1404 " not in group (block %llu)!",
1405 i, inode_table);
1406 return 0;
1407 }
1408 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1409 ext4_error(sb, __FUNCTION__,
1410 "Checksum for group %d failed (%u!=%u)\n", i,
1411 le16_to_cpu(ext4_group_desc_csum(sbi, i,
1412 gdp)),
1413 le16_to_cpu(gdp->bg_checksum));
1414 return 0;
1415 }
1416 if (!flexbg_flag)
1417 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1418 gdp = (struct ext4_group_desc *)
1419 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1420 }
1421
1422 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1423 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1424 return 1;
1425 }
1426
1427
1428 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1429 * the superblock) which were deleted from all directories, but held open by
1430 * a process at the time of a crash. We walk the list and try to delete these
1431 * inodes at recovery time (only with a read-write filesystem).
1432 *
1433 * In order to keep the orphan inode chain consistent during traversal (in
1434 * case of crash during recovery), we link each inode into the superblock
1435 * orphan list_head and handle it the same way as an inode deletion during
1436 * normal operation (which journals the operations for us).
1437 *
1438 * We only do an iget() and an iput() on each inode, which is very safe if we
1439 * accidentally point at an in-use or already deleted inode. The worst that
1440 * can happen in this case is that we get a "bit already cleared" message from
1441 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1442 * e2fsck was run on this filesystem, and it must have already done the orphan
1443 * inode cleanup for us, so we can safely abort without any further action.
1444 */
1445 static void ext4_orphan_cleanup (struct super_block * sb,
1446 struct ext4_super_block * es)
1447 {
1448 unsigned int s_flags = sb->s_flags;
1449 int nr_orphans = 0, nr_truncates = 0;
1450 #ifdef CONFIG_QUOTA
1451 int i;
1452 #endif
1453 if (!es->s_last_orphan) {
1454 jbd_debug(4, "no orphan inodes to clean up\n");
1455 return;
1456 }
1457
1458 if (bdev_read_only(sb->s_bdev)) {
1459 printk(KERN_ERR "EXT4-fs: write access "
1460 "unavailable, skipping orphan cleanup.\n");
1461 return;
1462 }
1463
1464 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1465 if (es->s_last_orphan)
1466 jbd_debug(1, "Errors on filesystem, "
1467 "clearing orphan list.\n");
1468 es->s_last_orphan = 0;
1469 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1470 return;
1471 }
1472
1473 if (s_flags & MS_RDONLY) {
1474 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1475 sb->s_id);
1476 sb->s_flags &= ~MS_RDONLY;
1477 }
1478 #ifdef CONFIG_QUOTA
1479 /* Needed for iput() to work correctly and not trash data */
1480 sb->s_flags |= MS_ACTIVE;
1481 /* Turn on quotas so that they are updated correctly */
1482 for (i = 0; i < MAXQUOTAS; i++) {
1483 if (EXT4_SB(sb)->s_qf_names[i]) {
1484 int ret = ext4_quota_on_mount(sb, i);
1485 if (ret < 0)
1486 printk(KERN_ERR
1487 "EXT4-fs: Cannot turn on journalled "
1488 "quota: error %d\n", ret);
1489 }
1490 }
1491 #endif
1492
1493 while (es->s_last_orphan) {
1494 struct inode *inode;
1495
1496 if (!(inode =
1497 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1498 es->s_last_orphan = 0;
1499 break;
1500 }
1501
1502 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1503 DQUOT_INIT(inode);
1504 if (inode->i_nlink) {
1505 printk(KERN_DEBUG
1506 "%s: truncating inode %lu to %Ld bytes\n",
1507 __FUNCTION__, inode->i_ino, inode->i_size);
1508 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1509 inode->i_ino, inode->i_size);
1510 ext4_truncate(inode);
1511 nr_truncates++;
1512 } else {
1513 printk(KERN_DEBUG
1514 "%s: deleting unreferenced inode %lu\n",
1515 __FUNCTION__, inode->i_ino);
1516 jbd_debug(2, "deleting unreferenced inode %lu\n",
1517 inode->i_ino);
1518 nr_orphans++;
1519 }
1520 iput(inode); /* The delete magic happens here! */
1521 }
1522
1523 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1524
1525 if (nr_orphans)
1526 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1527 sb->s_id, PLURAL(nr_orphans));
1528 if (nr_truncates)
1529 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1530 sb->s_id, PLURAL(nr_truncates));
1531 #ifdef CONFIG_QUOTA
1532 /* Turn quotas off */
1533 for (i = 0; i < MAXQUOTAS; i++) {
1534 if (sb_dqopt(sb)->files[i])
1535 vfs_quota_off(sb, i);
1536 }
1537 #endif
1538 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1539 }
1540
1541 /*
1542 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1543 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1544 * We need to be 1 filesystem block less than the 2^32 sector limit.
1545 */
1546 static loff_t ext4_max_size(int bits)
1547 {
1548 loff_t res = EXT4_NDIR_BLOCKS;
1549 /* This constant is calculated to be the largest file size for a
1550 * dense, 4k-blocksize file such that the total number of
1551 * sectors in the file, including data and all indirect blocks,
1552 * does not exceed 2^32. */
1553 const loff_t upper_limit = 0x1ff7fffd000LL;
1554
1555 res += 1LL << (bits-2);
1556 res += 1LL << (2*(bits-2));
1557 res += 1LL << (3*(bits-2));
1558 res <<= bits;
1559 if (res > upper_limit)
1560 res = upper_limit;
1561 return res;
1562 }
1563
1564 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1565 ext4_fsblk_t logical_sb_block, int nr)
1566 {
1567 struct ext4_sb_info *sbi = EXT4_SB(sb);
1568 unsigned long bg, first_meta_bg;
1569 int has_super = 0;
1570
1571 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1572
1573 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1574 nr < first_meta_bg)
1575 return logical_sb_block + nr + 1;
1576 bg = sbi->s_desc_per_block * nr;
1577 if (ext4_bg_has_super(sb, bg))
1578 has_super = 1;
1579 return (has_super + ext4_group_first_block_no(sb, bg));
1580 }
1581
1582
1583 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1584 {
1585 struct buffer_head * bh;
1586 struct ext4_super_block *es = NULL;
1587 struct ext4_sb_info *sbi;
1588 ext4_fsblk_t block;
1589 ext4_fsblk_t sb_block = get_sb_block(&data);
1590 ext4_fsblk_t logical_sb_block;
1591 unsigned long offset = 0;
1592 unsigned int journal_inum = 0;
1593 unsigned long journal_devnum = 0;
1594 unsigned long def_mount_opts;
1595 struct inode *root;
1596 int blocksize;
1597 int hblock;
1598 int db_count;
1599 int i;
1600 int needs_recovery;
1601 __le32 features;
1602 __u64 blocks_count;
1603 int err;
1604
1605 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1606 if (!sbi)
1607 return -ENOMEM;
1608 sb->s_fs_info = sbi;
1609 sbi->s_mount_opt = 0;
1610 sbi->s_resuid = EXT4_DEF_RESUID;
1611 sbi->s_resgid = EXT4_DEF_RESGID;
1612 sbi->s_sb_block = sb_block;
1613
1614 unlock_kernel();
1615
1616 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1617 if (!blocksize) {
1618 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1619 goto out_fail;
1620 }
1621
1622 /*
1623 * The ext4 superblock will not be buffer aligned for other than 1kB
1624 * block sizes. We need to calculate the offset from buffer start.
1625 */
1626 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1627 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1628 offset = do_div(logical_sb_block, blocksize);
1629 } else {
1630 logical_sb_block = sb_block;
1631 }
1632
1633 if (!(bh = sb_bread(sb, logical_sb_block))) {
1634 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1635 goto out_fail;
1636 }
1637 /*
1638 * Note: s_es must be initialized as soon as possible because
1639 * some ext4 macro-instructions depend on its value
1640 */
1641 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1642 sbi->s_es = es;
1643 sb->s_magic = le16_to_cpu(es->s_magic);
1644 if (sb->s_magic != EXT4_SUPER_MAGIC)
1645 goto cantfind_ext4;
1646
1647 /* Set defaults before we parse the mount options */
1648 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1649 if (def_mount_opts & EXT4_DEFM_DEBUG)
1650 set_opt(sbi->s_mount_opt, DEBUG);
1651 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1652 set_opt(sbi->s_mount_opt, GRPID);
1653 if (def_mount_opts & EXT4_DEFM_UID16)
1654 set_opt(sbi->s_mount_opt, NO_UID32);
1655 #ifdef CONFIG_EXT4DEV_FS_XATTR
1656 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1657 set_opt(sbi->s_mount_opt, XATTR_USER);
1658 #endif
1659 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1660 if (def_mount_opts & EXT4_DEFM_ACL)
1661 set_opt(sbi->s_mount_opt, POSIX_ACL);
1662 #endif
1663 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1664 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1665 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1666 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1667 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1668 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1669
1670 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1671 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1672 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1673 set_opt(sbi->s_mount_opt, ERRORS_RO);
1674 else
1675 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1676
1677 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1678 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1679
1680 set_opt(sbi->s_mount_opt, RESERVATION);
1681
1682 /*
1683 * turn on extents feature by default in ext4 filesystem
1684 * User -o noextents to turn it off
1685 */
1686 set_opt(sbi->s_mount_opt, EXTENTS);
1687
1688 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1689 NULL, 0))
1690 goto failed_mount;
1691
1692 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1693 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1694
1695 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1696 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1697 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1698 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1699 printk(KERN_WARNING
1700 "EXT4-fs warning: feature flags set on rev 0 fs, "
1701 "running e2fsck is recommended\n");
1702 /*
1703 * Check feature flags regardless of the revision level, since we
1704 * previously didn't change the revision level when setting the flags,
1705 * so there is a chance incompat flags are set on a rev 0 filesystem.
1706 */
1707 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1708 if (features) {
1709 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1710 "unsupported optional features (%x).\n",
1711 sb->s_id, le32_to_cpu(features));
1712 goto failed_mount;
1713 }
1714 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1715 if (!(sb->s_flags & MS_RDONLY) && features) {
1716 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1717 "unsupported optional features (%x).\n",
1718 sb->s_id, le32_to_cpu(features));
1719 goto failed_mount;
1720 }
1721 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1722
1723 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1724 blocksize > EXT4_MAX_BLOCK_SIZE) {
1725 printk(KERN_ERR
1726 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1727 blocksize, sb->s_id);
1728 goto failed_mount;
1729 }
1730
1731 hblock = bdev_hardsect_size(sb->s_bdev);
1732 if (sb->s_blocksize != blocksize) {
1733 /*
1734 * Make sure the blocksize for the filesystem is larger
1735 * than the hardware sectorsize for the machine.
1736 */
1737 if (blocksize < hblock) {
1738 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1739 "device blocksize %d.\n", blocksize, hblock);
1740 goto failed_mount;
1741 }
1742
1743 brelse (bh);
1744 sb_set_blocksize(sb, blocksize);
1745 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1746 offset = do_div(logical_sb_block, blocksize);
1747 bh = sb_bread(sb, logical_sb_block);
1748 if (!bh) {
1749 printk(KERN_ERR
1750 "EXT4-fs: Can't read superblock on 2nd try.\n");
1751 goto failed_mount;
1752 }
1753 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1754 sbi->s_es = es;
1755 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1756 printk (KERN_ERR
1757 "EXT4-fs: Magic mismatch, very weird !\n");
1758 goto failed_mount;
1759 }
1760 }
1761
1762 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1763
1764 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1765 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1766 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1767 } else {
1768 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1769 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1770 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1771 (!is_power_of_2(sbi->s_inode_size)) ||
1772 (sbi->s_inode_size > blocksize)) {
1773 printk (KERN_ERR
1774 "EXT4-fs: unsupported inode size: %d\n",
1775 sbi->s_inode_size);
1776 goto failed_mount;
1777 }
1778 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1779 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
1780 }
1781 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1782 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1783 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1784 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1785 !is_power_of_2(sbi->s_desc_size)) {
1786 printk(KERN_ERR
1787 "EXT4-fs: unsupported descriptor size %lu\n",
1788 sbi->s_desc_size);
1789 goto failed_mount;
1790 }
1791 } else
1792 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1793 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1794 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1795 if (EXT4_INODE_SIZE(sb) == 0)
1796 goto cantfind_ext4;
1797 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1798 if (sbi->s_inodes_per_block == 0)
1799 goto cantfind_ext4;
1800 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1801 sbi->s_inodes_per_block;
1802 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1803 sbi->s_sbh = bh;
1804 sbi->s_mount_state = le16_to_cpu(es->s_state);
1805 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1806 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
1807 for (i=0; i < 4; i++)
1808 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1809 sbi->s_def_hash_version = es->s_def_hash_version;
1810
1811 if (sbi->s_blocks_per_group > blocksize * 8) {
1812 printk (KERN_ERR
1813 "EXT4-fs: #blocks per group too big: %lu\n",
1814 sbi->s_blocks_per_group);
1815 goto failed_mount;
1816 }
1817 if (sbi->s_inodes_per_group > blocksize * 8) {
1818 printk (KERN_ERR
1819 "EXT4-fs: #inodes per group too big: %lu\n",
1820 sbi->s_inodes_per_group);
1821 goto failed_mount;
1822 }
1823
1824 if (ext4_blocks_count(es) >
1825 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1826 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1827 " too large to mount safely\n", sb->s_id);
1828 if (sizeof(sector_t) < 8)
1829 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1830 "enabled\n");
1831 goto failed_mount;
1832 }
1833
1834 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1835 goto cantfind_ext4;
1836 blocks_count = (ext4_blocks_count(es) -
1837 le32_to_cpu(es->s_first_data_block) +
1838 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1839 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1840 sbi->s_groups_count = blocks_count;
1841 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1842 EXT4_DESC_PER_BLOCK(sb);
1843 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1844 GFP_KERNEL);
1845 if (sbi->s_group_desc == NULL) {
1846 printk (KERN_ERR "EXT4-fs: not enough memory\n");
1847 goto failed_mount;
1848 }
1849
1850 bgl_lock_init(&sbi->s_blockgroup_lock);
1851
1852 for (i = 0; i < db_count; i++) {
1853 block = descriptor_loc(sb, logical_sb_block, i);
1854 sbi->s_group_desc[i] = sb_bread(sb, block);
1855 if (!sbi->s_group_desc[i]) {
1856 printk (KERN_ERR "EXT4-fs: "
1857 "can't read group descriptor %d\n", i);
1858 db_count = i;
1859 goto failed_mount2;
1860 }
1861 }
1862 if (!ext4_check_descriptors (sb)) {
1863 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1864 goto failed_mount2;
1865 }
1866 sbi->s_gdb_count = db_count;
1867 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1868 spin_lock_init(&sbi->s_next_gen_lock);
1869
1870 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1871 ext4_count_free_blocks(sb));
1872 if (!err) {
1873 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1874 ext4_count_free_inodes(sb));
1875 }
1876 if (!err) {
1877 err = percpu_counter_init(&sbi->s_dirs_counter,
1878 ext4_count_dirs(sb));
1879 }
1880 if (err) {
1881 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
1882 goto failed_mount3;
1883 }
1884
1885 /* per fileystem reservation list head & lock */
1886 spin_lock_init(&sbi->s_rsv_window_lock);
1887 sbi->s_rsv_window_root = RB_ROOT;
1888 /* Add a single, static dummy reservation to the start of the
1889 * reservation window list --- it gives us a placeholder for
1890 * append-at-start-of-list which makes the allocation logic
1891 * _much_ simpler. */
1892 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1893 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1894 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1895 sbi->s_rsv_window_head.rsv_goal_size = 0;
1896 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1897
1898 /*
1899 * set up enough so that it can read an inode
1900 */
1901 sb->s_op = &ext4_sops;
1902 sb->s_export_op = &ext4_export_ops;
1903 sb->s_xattr = ext4_xattr_handlers;
1904 #ifdef CONFIG_QUOTA
1905 sb->s_qcop = &ext4_qctl_operations;
1906 sb->dq_op = &ext4_quota_operations;
1907 #endif
1908 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1909
1910 sb->s_root = NULL;
1911
1912 needs_recovery = (es->s_last_orphan != 0 ||
1913 EXT4_HAS_INCOMPAT_FEATURE(sb,
1914 EXT4_FEATURE_INCOMPAT_RECOVER));
1915
1916 /*
1917 * The first inode we look at is the journal inode. Don't try
1918 * root first: it may be modified in the journal!
1919 */
1920 if (!test_opt(sb, NOLOAD) &&
1921 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1922 if (ext4_load_journal(sb, es, journal_devnum))
1923 goto failed_mount3;
1924 } else if (journal_inum) {
1925 if (ext4_create_journal(sb, es, journal_inum))
1926 goto failed_mount3;
1927 } else {
1928 if (!silent)
1929 printk (KERN_ERR
1930 "ext4: No journal on filesystem on %s\n",
1931 sb->s_id);
1932 goto failed_mount3;
1933 }
1934
1935 if (ext4_blocks_count(es) > 0xffffffffULL &&
1936 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
1937 JBD2_FEATURE_INCOMPAT_64BIT)) {
1938 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
1939 goto failed_mount4;
1940 }
1941
1942 /* We have now updated the journal if required, so we can
1943 * validate the data journaling mode. */
1944 switch (test_opt(sb, DATA_FLAGS)) {
1945 case 0:
1946 /* No mode set, assume a default based on the journal
1947 * capabilities: ORDERED_DATA if the journal can
1948 * cope, else JOURNAL_DATA
1949 */
1950 if (jbd2_journal_check_available_features
1951 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1952 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1953 else
1954 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1955 break;
1956
1957 case EXT4_MOUNT_ORDERED_DATA:
1958 case EXT4_MOUNT_WRITEBACK_DATA:
1959 if (!jbd2_journal_check_available_features
1960 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1961 printk(KERN_ERR "EXT4-fs: Journal does not support "
1962 "requested data journaling mode\n");
1963 goto failed_mount4;
1964 }
1965 default:
1966 break;
1967 }
1968
1969 if (test_opt(sb, NOBH)) {
1970 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1971 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1972 "its supported only with writeback mode\n");
1973 clear_opt(sbi->s_mount_opt, NOBH);
1974 }
1975 }
1976 /*
1977 * The jbd2_journal_load will have done any necessary log recovery,
1978 * so we can safely mount the rest of the filesystem now.
1979 */
1980
1981 root = iget(sb, EXT4_ROOT_INO);
1982 sb->s_root = d_alloc_root(root);
1983 if (!sb->s_root) {
1984 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1985 iput(root);
1986 goto failed_mount4;
1987 }
1988 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1989 dput(sb->s_root);
1990 sb->s_root = NULL;
1991 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1992 goto failed_mount4;
1993 }
1994
1995 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1996
1997 /* determine the minimum size of new large inodes, if present */
1998 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
1999 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2000 EXT4_GOOD_OLD_INODE_SIZE;
2001 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2002 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2003 if (sbi->s_want_extra_isize <
2004 le16_to_cpu(es->s_want_extra_isize))
2005 sbi->s_want_extra_isize =
2006 le16_to_cpu(es->s_want_extra_isize);
2007 if (sbi->s_want_extra_isize <
2008 le16_to_cpu(es->s_min_extra_isize))
2009 sbi->s_want_extra_isize =
2010 le16_to_cpu(es->s_min_extra_isize);
2011 }
2012 }
2013 /* Check if enough inode space is available */
2014 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2015 sbi->s_inode_size) {
2016 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2017 EXT4_GOOD_OLD_INODE_SIZE;
2018 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2019 "available.\n");
2020 }
2021
2022 /*
2023 * akpm: core read_super() calls in here with the superblock locked.
2024 * That deadlocks, because orphan cleanup needs to lock the superblock
2025 * in numerous places. Here we just pop the lock - it's relatively
2026 * harmless, because we are now ready to accept write_super() requests,
2027 * and aviro says that's the only reason for hanging onto the
2028 * superblock lock.
2029 */
2030 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2031 ext4_orphan_cleanup(sb, es);
2032 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2033 if (needs_recovery)
2034 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2035 ext4_mark_recovery_complete(sb, es);
2036 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2037 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2038 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2039 "writeback");
2040
2041 ext4_ext_init(sb);
2042
2043 lock_kernel();
2044 return 0;
2045
2046 cantfind_ext4:
2047 if (!silent)
2048 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2049 sb->s_id);
2050 goto failed_mount;
2051
2052 failed_mount4:
2053 jbd2_journal_destroy(sbi->s_journal);
2054 failed_mount3:
2055 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2056 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2057 percpu_counter_destroy(&sbi->s_dirs_counter);
2058 failed_mount2:
2059 for (i = 0; i < db_count; i++)
2060 brelse(sbi->s_group_desc[i]);
2061 kfree(sbi->s_group_desc);
2062 failed_mount:
2063 #ifdef CONFIG_QUOTA
2064 for (i = 0; i < MAXQUOTAS; i++)
2065 kfree(sbi->s_qf_names[i]);
2066 #endif
2067 ext4_blkdev_remove(sbi);
2068 brelse(bh);
2069 out_fail:
2070 sb->s_fs_info = NULL;
2071 kfree(sbi);
2072 lock_kernel();
2073 return -EINVAL;
2074 }
2075
2076 /*
2077 * Setup any per-fs journal parameters now. We'll do this both on
2078 * initial mount, once the journal has been initialised but before we've
2079 * done any recovery; and again on any subsequent remount.
2080 */
2081 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2082 {
2083 struct ext4_sb_info *sbi = EXT4_SB(sb);
2084
2085 if (sbi->s_commit_interval)
2086 journal->j_commit_interval = sbi->s_commit_interval;
2087 /* We could also set up an ext4-specific default for the commit
2088 * interval here, but for now we'll just fall back to the jbd
2089 * default. */
2090
2091 spin_lock(&journal->j_state_lock);
2092 if (test_opt(sb, BARRIER))
2093 journal->j_flags |= JBD2_BARRIER;
2094 else
2095 journal->j_flags &= ~JBD2_BARRIER;
2096 spin_unlock(&journal->j_state_lock);
2097 }
2098
2099 static journal_t *ext4_get_journal(struct super_block *sb,
2100 unsigned int journal_inum)
2101 {
2102 struct inode *journal_inode;
2103 journal_t *journal;
2104
2105 /* First, test for the existence of a valid inode on disk. Bad
2106 * things happen if we iget() an unused inode, as the subsequent
2107 * iput() will try to delete it. */
2108
2109 journal_inode = iget(sb, journal_inum);
2110 if (!journal_inode) {
2111 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2112 return NULL;
2113 }
2114 if (!journal_inode->i_nlink) {
2115 make_bad_inode(journal_inode);
2116 iput(journal_inode);
2117 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2118 return NULL;
2119 }
2120
2121 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2122 journal_inode, journal_inode->i_size);
2123 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
2124 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2125 iput(journal_inode);
2126 return NULL;
2127 }
2128
2129 journal = jbd2_journal_init_inode(journal_inode);
2130 if (!journal) {
2131 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2132 iput(journal_inode);
2133 return NULL;
2134 }
2135 journal->j_private = sb;
2136 ext4_init_journal_params(sb, journal);
2137 return journal;
2138 }
2139
2140 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2141 dev_t j_dev)
2142 {
2143 struct buffer_head * bh;
2144 journal_t *journal;
2145 ext4_fsblk_t start;
2146 ext4_fsblk_t len;
2147 int hblock, blocksize;
2148 ext4_fsblk_t sb_block;
2149 unsigned long offset;
2150 struct ext4_super_block * es;
2151 struct block_device *bdev;
2152
2153 bdev = ext4_blkdev_get(j_dev);
2154 if (bdev == NULL)
2155 return NULL;
2156
2157 if (bd_claim(bdev, sb)) {
2158 printk(KERN_ERR
2159 "EXT4: failed to claim external journal device.\n");
2160 blkdev_put(bdev);
2161 return NULL;
2162 }
2163
2164 blocksize = sb->s_blocksize;
2165 hblock = bdev_hardsect_size(bdev);
2166 if (blocksize < hblock) {
2167 printk(KERN_ERR
2168 "EXT4-fs: blocksize too small for journal device.\n");
2169 goto out_bdev;
2170 }
2171
2172 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2173 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2174 set_blocksize(bdev, blocksize);
2175 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2176 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2177 "external journal\n");
2178 goto out_bdev;
2179 }
2180
2181 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2182 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2183 !(le32_to_cpu(es->s_feature_incompat) &
2184 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2185 printk(KERN_ERR "EXT4-fs: external journal has "
2186 "bad superblock\n");
2187 brelse(bh);
2188 goto out_bdev;
2189 }
2190
2191 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2192 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2193 brelse(bh);
2194 goto out_bdev;
2195 }
2196
2197 len = ext4_blocks_count(es);
2198 start = sb_block + 1;
2199 brelse(bh); /* we're done with the superblock */
2200
2201 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2202 start, len, blocksize);
2203 if (!journal) {
2204 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2205 goto out_bdev;
2206 }
2207 journal->j_private = sb;
2208 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2209 wait_on_buffer(journal->j_sb_buffer);
2210 if (!buffer_uptodate(journal->j_sb_buffer)) {
2211 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2212 goto out_journal;
2213 }
2214 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2215 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2216 "user (unsupported) - %d\n",
2217 be32_to_cpu(journal->j_superblock->s_nr_users));
2218 goto out_journal;
2219 }
2220 EXT4_SB(sb)->journal_bdev = bdev;
2221 ext4_init_journal_params(sb, journal);
2222 return journal;
2223 out_journal:
2224 jbd2_journal_destroy(journal);
2225 out_bdev:
2226 ext4_blkdev_put(bdev);
2227 return NULL;
2228 }
2229
2230 static int ext4_load_journal(struct super_block *sb,
2231 struct ext4_super_block *es,
2232 unsigned long journal_devnum)
2233 {
2234 journal_t *journal;
2235 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2236 dev_t journal_dev;
2237 int err = 0;
2238 int really_read_only;
2239
2240 if (journal_devnum &&
2241 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2242 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2243 "numbers have changed\n");
2244 journal_dev = new_decode_dev(journal_devnum);
2245 } else
2246 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2247
2248 really_read_only = bdev_read_only(sb->s_bdev);
2249
2250 /*
2251 * Are we loading a blank journal or performing recovery after a
2252 * crash? For recovery, we need to check in advance whether we
2253 * can get read-write access to the device.
2254 */
2255
2256 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2257 if (sb->s_flags & MS_RDONLY) {
2258 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2259 "required on readonly filesystem.\n");
2260 if (really_read_only) {
2261 printk(KERN_ERR "EXT4-fs: write access "
2262 "unavailable, cannot proceed.\n");
2263 return -EROFS;
2264 }
2265 printk (KERN_INFO "EXT4-fs: write access will "
2266 "be enabled during recovery.\n");
2267 }
2268 }
2269
2270 if (journal_inum && journal_dev) {
2271 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2272 "and inode journals!\n");
2273 return -EINVAL;
2274 }
2275
2276 if (journal_inum) {
2277 if (!(journal = ext4_get_journal(sb, journal_inum)))
2278 return -EINVAL;
2279 } else {
2280 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2281 return -EINVAL;
2282 }
2283
2284 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2285 err = jbd2_journal_update_format(journal);
2286 if (err) {
2287 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2288 jbd2_journal_destroy(journal);
2289 return err;
2290 }
2291 }
2292
2293 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2294 err = jbd2_journal_wipe(journal, !really_read_only);
2295 if (!err)
2296 err = jbd2_journal_load(journal);
2297
2298 if (err) {
2299 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2300 jbd2_journal_destroy(journal);
2301 return err;
2302 }
2303
2304 EXT4_SB(sb)->s_journal = journal;
2305 ext4_clear_journal_err(sb, es);
2306
2307 if (journal_devnum &&
2308 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2309 es->s_journal_dev = cpu_to_le32(journal_devnum);
2310 sb->s_dirt = 1;
2311
2312 /* Make sure we flush the recovery flag to disk. */
2313 ext4_commit_super(sb, es, 1);
2314 }
2315
2316 return 0;
2317 }
2318
2319 static int ext4_create_journal(struct super_block * sb,
2320 struct ext4_super_block * es,
2321 unsigned int journal_inum)
2322 {
2323 journal_t *journal;
2324 int err;
2325
2326 if (sb->s_flags & MS_RDONLY) {
2327 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2328 "create journal.\n");
2329 return -EROFS;
2330 }
2331
2332 journal = ext4_get_journal(sb, journal_inum);
2333 if (!journal)
2334 return -EINVAL;
2335
2336 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2337 journal_inum);
2338
2339 err = jbd2_journal_create(journal);
2340 if (err) {
2341 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2342 jbd2_journal_destroy(journal);
2343 return -EIO;
2344 }
2345
2346 EXT4_SB(sb)->s_journal = journal;
2347
2348 ext4_update_dynamic_rev(sb);
2349 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2350 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2351
2352 es->s_journal_inum = cpu_to_le32(journal_inum);
2353 sb->s_dirt = 1;
2354
2355 /* Make sure we flush the recovery flag to disk. */
2356 ext4_commit_super(sb, es, 1);
2357
2358 return 0;
2359 }
2360
2361 static void ext4_commit_super (struct super_block * sb,
2362 struct ext4_super_block * es,
2363 int sync)
2364 {
2365 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2366
2367 if (!sbh)
2368 return;
2369 es->s_wtime = cpu_to_le32(get_seconds());
2370 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2371 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2372 BUFFER_TRACE(sbh, "marking dirty");
2373 mark_buffer_dirty(sbh);
2374 if (sync)
2375 sync_dirty_buffer(sbh);
2376 }
2377
2378
2379 /*
2380 * Have we just finished recovery? If so, and if we are mounting (or
2381 * remounting) the filesystem readonly, then we will end up with a
2382 * consistent fs on disk. Record that fact.
2383 */
2384 static void ext4_mark_recovery_complete(struct super_block * sb,
2385 struct ext4_super_block * es)
2386 {
2387 journal_t *journal = EXT4_SB(sb)->s_journal;
2388
2389 jbd2_journal_lock_updates(journal);
2390 jbd2_journal_flush(journal);
2391 lock_super(sb);
2392 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2393 sb->s_flags & MS_RDONLY) {
2394 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2395 sb->s_dirt = 0;
2396 ext4_commit_super(sb, es, 1);
2397 }
2398 unlock_super(sb);
2399 jbd2_journal_unlock_updates(journal);
2400 }
2401
2402 /*
2403 * If we are mounting (or read-write remounting) a filesystem whose journal
2404 * has recorded an error from a previous lifetime, move that error to the
2405 * main filesystem now.
2406 */
2407 static void ext4_clear_journal_err(struct super_block * sb,
2408 struct ext4_super_block * es)
2409 {
2410 journal_t *journal;
2411 int j_errno;
2412 const char *errstr;
2413
2414 journal = EXT4_SB(sb)->s_journal;
2415
2416 /*
2417 * Now check for any error status which may have been recorded in the
2418 * journal by a prior ext4_error() or ext4_abort()
2419 */
2420
2421 j_errno = jbd2_journal_errno(journal);
2422 if (j_errno) {
2423 char nbuf[16];
2424
2425 errstr = ext4_decode_error(sb, j_errno, nbuf);
2426 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2427 "from previous mount: %s", errstr);
2428 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2429 "filesystem check.");
2430
2431 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2432 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2433 ext4_commit_super (sb, es, 1);
2434
2435 jbd2_journal_clear_err(journal);
2436 }
2437 }
2438
2439 /*
2440 * Force the running and committing transactions to commit,
2441 * and wait on the commit.
2442 */
2443 int ext4_force_commit(struct super_block *sb)
2444 {
2445 journal_t *journal;
2446 int ret;
2447
2448 if (sb->s_flags & MS_RDONLY)
2449 return 0;
2450
2451 journal = EXT4_SB(sb)->s_journal;
2452 sb->s_dirt = 0;
2453 ret = ext4_journal_force_commit(journal);
2454 return ret;
2455 }
2456
2457 /*
2458 * Ext4 always journals updates to the superblock itself, so we don't
2459 * have to propagate any other updates to the superblock on disk at this
2460 * point. Just start an async writeback to get the buffers on their way
2461 * to the disk.
2462 *
2463 * This implicitly triggers the writebehind on sync().
2464 */
2465
2466 static void ext4_write_super (struct super_block * sb)
2467 {
2468 if (mutex_trylock(&sb->s_lock) != 0)
2469 BUG();
2470 sb->s_dirt = 0;
2471 }
2472
2473 static int ext4_sync_fs(struct super_block *sb, int wait)
2474 {
2475 tid_t target;
2476
2477 sb->s_dirt = 0;
2478 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2479 if (wait)
2480 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2481 }
2482 return 0;
2483 }
2484
2485 /*
2486 * LVM calls this function before a (read-only) snapshot is created. This
2487 * gives us a chance to flush the journal completely and mark the fs clean.
2488 */
2489 static void ext4_write_super_lockfs(struct super_block *sb)
2490 {
2491 sb->s_dirt = 0;
2492
2493 if (!(sb->s_flags & MS_RDONLY)) {
2494 journal_t *journal = EXT4_SB(sb)->s_journal;
2495
2496 /* Now we set up the journal barrier. */
2497 jbd2_journal_lock_updates(journal);
2498 jbd2_journal_flush(journal);
2499
2500 /* Journal blocked and flushed, clear needs_recovery flag. */
2501 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2502 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2503 }
2504 }
2505
2506 /*
2507 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2508 * flag here, even though the filesystem is not technically dirty yet.
2509 */
2510 static void ext4_unlockfs(struct super_block *sb)
2511 {
2512 if (!(sb->s_flags & MS_RDONLY)) {
2513 lock_super(sb);
2514 /* Reser the needs_recovery flag before the fs is unlocked. */
2515 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2516 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2517 unlock_super(sb);
2518 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2519 }
2520 }
2521
2522 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2523 {
2524 struct ext4_super_block * es;
2525 struct ext4_sb_info *sbi = EXT4_SB(sb);
2526 ext4_fsblk_t n_blocks_count = 0;
2527 unsigned long old_sb_flags;
2528 struct ext4_mount_options old_opts;
2529 int err;
2530 #ifdef CONFIG_QUOTA
2531 int i;
2532 #endif
2533
2534 /* Store the original options */
2535 old_sb_flags = sb->s_flags;
2536 old_opts.s_mount_opt = sbi->s_mount_opt;
2537 old_opts.s_resuid = sbi->s_resuid;
2538 old_opts.s_resgid = sbi->s_resgid;
2539 old_opts.s_commit_interval = sbi->s_commit_interval;
2540 #ifdef CONFIG_QUOTA
2541 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2542 for (i = 0; i < MAXQUOTAS; i++)
2543 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2544 #endif
2545
2546 /*
2547 * Allow the "check" option to be passed as a remount option.
2548 */
2549 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2550 err = -EINVAL;
2551 goto restore_opts;
2552 }
2553
2554 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2555 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2556
2557 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2558 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2559
2560 es = sbi->s_es;
2561
2562 ext4_init_journal_params(sb, sbi->s_journal);
2563
2564 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2565 n_blocks_count > ext4_blocks_count(es)) {
2566 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2567 err = -EROFS;
2568 goto restore_opts;
2569 }
2570
2571 if (*flags & MS_RDONLY) {
2572 /*
2573 * First of all, the unconditional stuff we have to do
2574 * to disable replay of the journal when we next remount
2575 */
2576 sb->s_flags |= MS_RDONLY;
2577
2578 /*
2579 * OK, test if we are remounting a valid rw partition
2580 * readonly, and if so set the rdonly flag and then
2581 * mark the partition as valid again.
2582 */
2583 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2584 (sbi->s_mount_state & EXT4_VALID_FS))
2585 es->s_state = cpu_to_le16(sbi->s_mount_state);
2586
2587 /*
2588 * We have to unlock super so that we can wait for
2589 * transactions.
2590 */
2591 unlock_super(sb);
2592 ext4_mark_recovery_complete(sb, es);
2593 lock_super(sb);
2594 } else {
2595 __le32 ret;
2596 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2597 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2598 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2599 "remount RDWR because of unsupported "
2600 "optional features (%x).\n",
2601 sb->s_id, le32_to_cpu(ret));
2602 err = -EROFS;
2603 goto restore_opts;
2604 }
2605
2606 /*
2607 * If we have an unprocessed orphan list hanging
2608 * around from a previously readonly bdev mount,
2609 * require a full umount/remount for now.
2610 */
2611 if (es->s_last_orphan) {
2612 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2613 "remount RDWR because of unprocessed "
2614 "orphan inode list. Please "
2615 "umount/remount instead.\n",
2616 sb->s_id);
2617 err = -EINVAL;
2618 goto restore_opts;
2619 }
2620
2621 /*
2622 * Mounting a RDONLY partition read-write, so reread
2623 * and store the current valid flag. (It may have
2624 * been changed by e2fsck since we originally mounted
2625 * the partition.)
2626 */
2627 ext4_clear_journal_err(sb, es);
2628 sbi->s_mount_state = le16_to_cpu(es->s_state);
2629 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2630 goto restore_opts;
2631 if (!ext4_setup_super (sb, es, 0))
2632 sb->s_flags &= ~MS_RDONLY;
2633 }
2634 }
2635 #ifdef CONFIG_QUOTA
2636 /* Release old quota file names */
2637 for (i = 0; i < MAXQUOTAS; i++)
2638 if (old_opts.s_qf_names[i] &&
2639 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2640 kfree(old_opts.s_qf_names[i]);
2641 #endif
2642 return 0;
2643 restore_opts:
2644 sb->s_flags = old_sb_flags;
2645 sbi->s_mount_opt = old_opts.s_mount_opt;
2646 sbi->s_resuid = old_opts.s_resuid;
2647 sbi->s_resgid = old_opts.s_resgid;
2648 sbi->s_commit_interval = old_opts.s_commit_interval;
2649 #ifdef CONFIG_QUOTA
2650 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2651 for (i = 0; i < MAXQUOTAS; i++) {
2652 if (sbi->s_qf_names[i] &&
2653 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2654 kfree(sbi->s_qf_names[i]);
2655 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2656 }
2657 #endif
2658 return err;
2659 }
2660
2661 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2662 {
2663 struct super_block *sb = dentry->d_sb;
2664 struct ext4_sb_info *sbi = EXT4_SB(sb);
2665 struct ext4_super_block *es = sbi->s_es;
2666 u64 fsid;
2667
2668 if (test_opt(sb, MINIX_DF)) {
2669 sbi->s_overhead_last = 0;
2670 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
2671 unsigned long ngroups = sbi->s_groups_count, i;
2672 ext4_fsblk_t overhead = 0;
2673 smp_rmb();
2674
2675 /*
2676 * Compute the overhead (FS structures). This is constant
2677 * for a given filesystem unless the number of block groups
2678 * changes so we cache the previous value until it does.
2679 */
2680
2681 /*
2682 * All of the blocks before first_data_block are
2683 * overhead
2684 */
2685 overhead = le32_to_cpu(es->s_first_data_block);
2686
2687 /*
2688 * Add the overhead attributed to the superblock and
2689 * block group descriptors. If the sparse superblocks
2690 * feature is turned on, then not all groups have this.
2691 */
2692 for (i = 0; i < ngroups; i++) {
2693 overhead += ext4_bg_has_super(sb, i) +
2694 ext4_bg_num_gdb(sb, i);
2695 cond_resched();
2696 }
2697
2698 /*
2699 * Every block group has an inode bitmap, a block
2700 * bitmap, and an inode table.
2701 */
2702 overhead += ngroups * (2 + sbi->s_itb_per_group);
2703 sbi->s_overhead_last = overhead;
2704 smp_wmb();
2705 sbi->s_blocks_last = ext4_blocks_count(es);
2706 }
2707
2708 buf->f_type = EXT4_SUPER_MAGIC;
2709 buf->f_bsize = sb->s_blocksize;
2710 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
2711 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2712 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2713 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2714 if (buf->f_bfree < ext4_r_blocks_count(es))
2715 buf->f_bavail = 0;
2716 buf->f_files = le32_to_cpu(es->s_inodes_count);
2717 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2718 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2719 buf->f_namelen = EXT4_NAME_LEN;
2720 fsid = le64_to_cpup((void *)es->s_uuid) ^
2721 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2722 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2723 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2724 return 0;
2725 }
2726
2727 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2728 * is locked for write. Otherwise the are possible deadlocks:
2729 * Process 1 Process 2
2730 * ext4_create() quota_sync()
2731 * jbd2_journal_start() write_dquot()
2732 * DQUOT_INIT() down(dqio_mutex)
2733 * down(dqio_mutex) jbd2_journal_start()
2734 *
2735 */
2736
2737 #ifdef CONFIG_QUOTA
2738
2739 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2740 {
2741 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2742 }
2743
2744 static int ext4_dquot_initialize(struct inode *inode, int type)
2745 {
2746 handle_t *handle;
2747 int ret, err;
2748
2749 /* We may create quota structure so we need to reserve enough blocks */
2750 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2751 if (IS_ERR(handle))
2752 return PTR_ERR(handle);
2753 ret = dquot_initialize(inode, type);
2754 err = ext4_journal_stop(handle);
2755 if (!ret)
2756 ret = err;
2757 return ret;
2758 }
2759
2760 static int ext4_dquot_drop(struct inode *inode)
2761 {
2762 handle_t *handle;
2763 int ret, err;
2764
2765 /* We may delete quota structure so we need to reserve enough blocks */
2766 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2767 if (IS_ERR(handle))
2768 return PTR_ERR(handle);
2769 ret = dquot_drop(inode);
2770 err = ext4_journal_stop(handle);
2771 if (!ret)
2772 ret = err;
2773 return ret;
2774 }
2775
2776 static int ext4_write_dquot(struct dquot *dquot)
2777 {
2778 int ret, err;
2779 handle_t *handle;
2780 struct inode *inode;
2781
2782 inode = dquot_to_inode(dquot);
2783 handle = ext4_journal_start(inode,
2784 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2785 if (IS_ERR(handle))
2786 return PTR_ERR(handle);
2787 ret = dquot_commit(dquot);
2788 err = ext4_journal_stop(handle);
2789 if (!ret)
2790 ret = err;
2791 return ret;
2792 }
2793
2794 static int ext4_acquire_dquot(struct dquot *dquot)
2795 {
2796 int ret, err;
2797 handle_t *handle;
2798
2799 handle = ext4_journal_start(dquot_to_inode(dquot),
2800 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2801 if (IS_ERR(handle))
2802 return PTR_ERR(handle);
2803 ret = dquot_acquire(dquot);
2804 err = ext4_journal_stop(handle);
2805 if (!ret)
2806 ret = err;
2807 return ret;
2808 }
2809
2810 static int ext4_release_dquot(struct dquot *dquot)
2811 {
2812 int ret, err;
2813 handle_t *handle;
2814
2815 handle = ext4_journal_start(dquot_to_inode(dquot),
2816 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2817 if (IS_ERR(handle)) {
2818 /* Release dquot anyway to avoid endless cycle in dqput() */
2819 dquot_release(dquot);
2820 return PTR_ERR(handle);
2821 }
2822 ret = dquot_release(dquot);
2823 err = ext4_journal_stop(handle);
2824 if (!ret)
2825 ret = err;
2826 return ret;
2827 }
2828
2829 static int ext4_mark_dquot_dirty(struct dquot *dquot)
2830 {
2831 /* Are we journalling quotas? */
2832 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2833 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2834 dquot_mark_dquot_dirty(dquot);
2835 return ext4_write_dquot(dquot);
2836 } else {
2837 return dquot_mark_dquot_dirty(dquot);
2838 }
2839 }
2840
2841 static int ext4_write_info(struct super_block *sb, int type)
2842 {
2843 int ret, err;
2844 handle_t *handle;
2845
2846 /* Data block + inode block */
2847 handle = ext4_journal_start(sb->s_root->d_inode, 2);
2848 if (IS_ERR(handle))
2849 return PTR_ERR(handle);
2850 ret = dquot_commit_info(sb, type);
2851 err = ext4_journal_stop(handle);
2852 if (!ret)
2853 ret = err;
2854 return ret;
2855 }
2856
2857 /*
2858 * Turn on quotas during mount time - we need to find
2859 * the quota file and such...
2860 */
2861 static int ext4_quota_on_mount(struct super_block *sb, int type)
2862 {
2863 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2864 EXT4_SB(sb)->s_jquota_fmt, type);
2865 }
2866
2867 /*
2868 * Standard function to be called on quota_on
2869 */
2870 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2871 char *path)
2872 {
2873 int err;
2874 struct nameidata nd;
2875
2876 if (!test_opt(sb, QUOTA))
2877 return -EINVAL;
2878 /* Not journalling quota? */
2879 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2880 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2881 return vfs_quota_on(sb, type, format_id, path);
2882 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2883 if (err)
2884 return err;
2885 /* Quotafile not on the same filesystem? */
2886 if (nd.mnt->mnt_sb != sb) {
2887 path_release(&nd);
2888 return -EXDEV;
2889 }
2890 /* Quotafile not of fs root? */
2891 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2892 printk(KERN_WARNING
2893 "EXT4-fs: Quota file not on filesystem root. "
2894 "Journalled quota will not work.\n");
2895 path_release(&nd);
2896 return vfs_quota_on(sb, type, format_id, path);
2897 }
2898
2899 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2900 * acquiring the locks... As quota files are never truncated and quota code
2901 * itself serializes the operations (and noone else should touch the files)
2902 * we don't have to be afraid of races */
2903 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2904 size_t len, loff_t off)
2905 {
2906 struct inode *inode = sb_dqopt(sb)->files[type];
2907 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2908 int err = 0;
2909 int offset = off & (sb->s_blocksize - 1);
2910 int tocopy;
2911 size_t toread;
2912 struct buffer_head *bh;
2913 loff_t i_size = i_size_read(inode);
2914
2915 if (off > i_size)
2916 return 0;
2917 if (off+len > i_size)
2918 len = i_size-off;
2919 toread = len;
2920 while (toread > 0) {
2921 tocopy = sb->s_blocksize - offset < toread ?
2922 sb->s_blocksize - offset : toread;
2923 bh = ext4_bread(NULL, inode, blk, 0, &err);
2924 if (err)
2925 return err;
2926 if (!bh) /* A hole? */
2927 memset(data, 0, tocopy);
2928 else
2929 memcpy(data, bh->b_data+offset, tocopy);
2930 brelse(bh);
2931 offset = 0;
2932 toread -= tocopy;
2933 data += tocopy;
2934 blk++;
2935 }
2936 return len;
2937 }
2938
2939 /* Write to quotafile (we know the transaction is already started and has
2940 * enough credits) */
2941 static ssize_t ext4_quota_write(struct super_block *sb, int type,
2942 const char *data, size_t len, loff_t off)
2943 {
2944 struct inode *inode = sb_dqopt(sb)->files[type];
2945 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2946 int err = 0;
2947 int offset = off & (sb->s_blocksize - 1);
2948 int tocopy;
2949 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2950 size_t towrite = len;
2951 struct buffer_head *bh;
2952 handle_t *handle = journal_current_handle();
2953
2954 if (!handle) {
2955 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2956 " cancelled because transaction is not started.\n",
2957 (unsigned long long)off, (unsigned long long)len);
2958 return -EIO;
2959 }
2960 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2961 while (towrite > 0) {
2962 tocopy = sb->s_blocksize - offset < towrite ?
2963 sb->s_blocksize - offset : towrite;
2964 bh = ext4_bread(handle, inode, blk, 1, &err);
2965 if (!bh)
2966 goto out;
2967 if (journal_quota) {
2968 err = ext4_journal_get_write_access(handle, bh);
2969 if (err) {
2970 brelse(bh);
2971 goto out;
2972 }
2973 }
2974 lock_buffer(bh);
2975 memcpy(bh->b_data+offset, data, tocopy);
2976 flush_dcache_page(bh->b_page);
2977 unlock_buffer(bh);
2978 if (journal_quota)
2979 err = ext4_journal_dirty_metadata(handle, bh);
2980 else {
2981 /* Always do at least ordered writes for quotas */
2982 err = ext4_journal_dirty_data(handle, bh);
2983 mark_buffer_dirty(bh);
2984 }
2985 brelse(bh);
2986 if (err)
2987 goto out;
2988 offset = 0;
2989 towrite -= tocopy;
2990 data += tocopy;
2991 blk++;
2992 }
2993 out:
2994 if (len == towrite)
2995 return err;
2996 if (inode->i_size < off+len-towrite) {
2997 i_size_write(inode, off+len-towrite);
2998 EXT4_I(inode)->i_disksize = inode->i_size;
2999 }
3000 inode->i_version++;
3001 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3002 ext4_mark_inode_dirty(handle, inode);
3003 mutex_unlock(&inode->i_mutex);
3004 return len - towrite;
3005 }
3006
3007 #endif
3008
3009 static int ext4_get_sb(struct file_system_type *fs_type,
3010 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3011 {
3012 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3013 }
3014
3015 static struct file_system_type ext4dev_fs_type = {
3016 .owner = THIS_MODULE,
3017 .name = "ext4dev",
3018 .get_sb = ext4_get_sb,
3019 .kill_sb = kill_block_super,
3020 .fs_flags = FS_REQUIRES_DEV,
3021 };
3022
3023 static int __init init_ext4_fs(void)
3024 {
3025 int err = init_ext4_xattr();
3026 if (err)
3027 return err;
3028 err = init_inodecache();
3029 if (err)
3030 goto out1;
3031 err = register_filesystem(&ext4dev_fs_type);
3032 if (err)
3033 goto out;
3034 return 0;
3035 out:
3036 destroy_inodecache();
3037 out1:
3038 exit_ext4_xattr();
3039 return err;
3040 }
3041
3042 static void __exit exit_ext4_fs(void)
3043 {
3044 unregister_filesystem(&ext4dev_fs_type);
3045 destroy_inodecache();
3046 exit_ext4_xattr();
3047 }
3048
3049 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3050 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3051 MODULE_LICENSE("GPL");
3052 module_init(init_ext4_fs)
3053 module_exit(exit_ext4_fs)
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