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diff --git a/fs/ext4/super.c b/fs/ext4/super.c
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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/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
38
39#include <asm/uaccess.h>
40
41#include "xattr.h"
42#include "acl.h"
43#include "namei.h"
44
45static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
46 unsigned long journal_devnum);
47static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
48 unsigned int);
49static void ext4_commit_super (struct super_block * sb,
50 struct ext4_super_block * es,
51 int sync);
52static void ext4_mark_recovery_complete(struct super_block * sb,
53 struct ext4_super_block * es);
54static void ext4_clear_journal_err(struct super_block * sb,
55 struct ext4_super_block * es);
56static int ext4_sync_fs(struct super_block *sb, int wait);
57static const char *ext4_decode_error(struct super_block * sb, int errno,
58 char nbuf[16]);
59static int ext4_remount (struct super_block * sb, int * flags, char * data);
60static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
61static void ext4_unlockfs(struct super_block *sb);
62static void ext4_write_super (struct super_block * sb);
63static void ext4_write_super_lockfs(struct super_block *sb);
64
65
66ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
67 struct ext4_group_desc *bg)
68{
69 return le32_to_cpu(bg->bg_block_bitmap) |
70 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
71 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
72}
73
74ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
75 struct ext4_group_desc *bg)
76{
77 return le32_to_cpu(bg->bg_inode_bitmap) |
78 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
79 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
80}
81
82ext4_fsblk_t ext4_inode_table(struct super_block *sb,
83 struct ext4_group_desc *bg)
84{
85 return le32_to_cpu(bg->bg_inode_table) |
86 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
87 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
88}
89
90void ext4_block_bitmap_set(struct super_block *sb,
91 struct ext4_group_desc *bg, ext4_fsblk_t blk)
92{
93 bg->bg_block_bitmap = cpu_to_le32((u32)blk);
94 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
95 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
96}
97
98void ext4_inode_bitmap_set(struct super_block *sb,
99 struct ext4_group_desc *bg, ext4_fsblk_t blk)
100{
101 bg->bg_inode_bitmap = cpu_to_le32((u32)blk);
102 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
103 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
104}
105
106void ext4_inode_table_set(struct super_block *sb,
107 struct ext4_group_desc *bg, ext4_fsblk_t blk)
108{
109 bg->bg_inode_table = cpu_to_le32((u32)blk);
110 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
111 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
112}
113
114/*
115 * Wrappers for jbd2_journal_start/end.
116 *
117 * The only special thing we need to do here is to make sure that all
118 * journal_end calls result in the superblock being marked dirty, so
119 * that sync() will call the filesystem's write_super callback if
120 * appropriate.
121 */
122handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
123{
124 journal_t *journal;
125
126 if (sb->s_flags & MS_RDONLY)
127 return ERR_PTR(-EROFS);
128
129 /* Special case here: if the journal has aborted behind our
130 * backs (eg. EIO in the commit thread), then we still need to
131 * take the FS itself readonly cleanly. */
132 journal = EXT4_SB(sb)->s_journal;
133 if (is_journal_aborted(journal)) {
134 ext4_abort(sb, __FUNCTION__,
135 "Detected aborted journal");
136 return ERR_PTR(-EROFS);
137 }
138
139 return jbd2_journal_start(journal, nblocks);
140}
141
142/*
143 * The only special thing we need to do here is to make sure that all
144 * jbd2_journal_stop calls result in the superblock being marked dirty, so
145 * that sync() will call the filesystem's write_super callback if
146 * appropriate.
147 */
148int __ext4_journal_stop(const char *where, handle_t *handle)
149{
150 struct super_block *sb;
151 int err;
152 int rc;
153
154 sb = handle->h_transaction->t_journal->j_private;
155 err = handle->h_err;
156 rc = jbd2_journal_stop(handle);
157
158 if (!err)
159 err = rc;
160 if (err)
161 __ext4_std_error(sb, where, err);
162 return err;
163}
164
165void ext4_journal_abort_handle(const char *caller, const char *err_fn,
166 struct buffer_head *bh, handle_t *handle, int err)
167{
168 char nbuf[16];
169 const char *errstr = ext4_decode_error(NULL, err, nbuf);
170
171 if (bh)
172 BUFFER_TRACE(bh, "abort");
173
174 if (!handle->h_err)
175 handle->h_err = err;
176
177 if (is_handle_aborted(handle))
178 return;
179
180 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
181 caller, errstr, err_fn);
182
183 jbd2_journal_abort_handle(handle);
184}
185
186/* Deal with the reporting of failure conditions on a filesystem such as
187 * inconsistencies detected or read IO failures.
188 *
189 * On ext2, we can store the error state of the filesystem in the
190 * superblock. That is not possible on ext4, because we may have other
191 * write ordering constraints on the superblock which prevent us from
192 * writing it out straight away; and given that the journal is about to
193 * be aborted, we can't rely on the current, or future, transactions to
194 * write out the superblock safely.
195 *
196 * We'll just use the jbd2_journal_abort() error code to record an error in
197 * the journal instead. On recovery, the journal will compain about
198 * that error until we've noted it down and cleared it.
199 */
200
201static void ext4_handle_error(struct super_block *sb)
202{
203 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
204
205 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
206 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
207
208 if (sb->s_flags & MS_RDONLY)
209 return;
210
211 if (!test_opt (sb, ERRORS_CONT)) {
212 journal_t *journal = EXT4_SB(sb)->s_journal;
213
214 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
215 if (journal)
216 jbd2_journal_abort(journal, -EIO);
217 }
218 if (test_opt (sb, ERRORS_RO)) {
219 printk (KERN_CRIT "Remounting filesystem read-only\n");
220 sb->s_flags |= MS_RDONLY;
221 }
222 ext4_commit_super(sb, es, 1);
223 if (test_opt(sb, ERRORS_PANIC))
224 panic("EXT4-fs (device %s): panic forced after error\n",
225 sb->s_id);
226}
227
228void ext4_error (struct super_block * sb, const char * function,
229 const char * fmt, ...)
230{
231 va_list args;
232
233 va_start(args, fmt);
234 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
235 vprintk(fmt, args);
236 printk("\n");
237 va_end(args);
238
239 ext4_handle_error(sb);
240}
241
242static const char *ext4_decode_error(struct super_block * sb, int errno,
243 char nbuf[16])
244{
245 char *errstr = NULL;
246
247 switch (errno) {
248 case -EIO:
249 errstr = "IO failure";
250 break;
251 case -ENOMEM:
252 errstr = "Out of memory";
253 break;
254 case -EROFS:
255 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
256 errstr = "Journal has aborted";
257 else
258 errstr = "Readonly filesystem";
259 break;
260 default:
261 /* If the caller passed in an extra buffer for unknown
262 * errors, textualise them now. Else we just return
263 * NULL. */
264 if (nbuf) {
265 /* Check for truncated error codes... */
266 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
267 errstr = nbuf;
268 }
269 break;
270 }
271
272 return errstr;
273}
274
275/* __ext4_std_error decodes expected errors from journaling functions
276 * automatically and invokes the appropriate error response. */
277
278void __ext4_std_error (struct super_block * sb, const char * function,
279 int errno)
280{
281 char nbuf[16];
282 const char *errstr;
283
284 /* Special case: if the error is EROFS, and we're not already
285 * inside a transaction, then there's really no point in logging
286 * an error. */
287 if (errno == -EROFS && journal_current_handle() == NULL &&
288 (sb->s_flags & MS_RDONLY))
289 return;
290
291 errstr = ext4_decode_error(sb, errno, nbuf);
292 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
293 sb->s_id, function, errstr);
294
295 ext4_handle_error(sb);
296}
297
298/*
299 * ext4_abort is a much stronger failure handler than ext4_error. The
300 * abort function may be used to deal with unrecoverable failures such
301 * as journal IO errors or ENOMEM at a critical moment in log management.
302 *
303 * We unconditionally force the filesystem into an ABORT|READONLY state,
304 * unless the error response on the fs has been set to panic in which
305 * case we take the easy way out and panic immediately.
306 */
307
308void ext4_abort (struct super_block * sb, const char * function,
309 const char * fmt, ...)
310{
311 va_list args;
312
313 printk (KERN_CRIT "ext4_abort called.\n");
314
315 va_start(args, fmt);
316 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
317 vprintk(fmt, args);
318 printk("\n");
319 va_end(args);
320
321 if (test_opt(sb, ERRORS_PANIC))
322 panic("EXT4-fs panic from previous error\n");
323
324 if (sb->s_flags & MS_RDONLY)
325 return;
326
327 printk(KERN_CRIT "Remounting filesystem read-only\n");
328 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
329 sb->s_flags |= MS_RDONLY;
330 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
331 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
332}
333
334void ext4_warning (struct super_block * sb, const char * function,
335 const char * fmt, ...)
336{
337 va_list args;
338
339 va_start(args, fmt);
340 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
341 sb->s_id, function);
342 vprintk(fmt, args);
343 printk("\n");
344 va_end(args);
345}
346
347void ext4_update_dynamic_rev(struct super_block *sb)
348{
349 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
350
351 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
352 return;
353
354 ext4_warning(sb, __FUNCTION__,
355 "updating to rev %d because of new feature flag, "
356 "running e2fsck is recommended",
357 EXT4_DYNAMIC_REV);
358
359 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
360 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
361 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
362 /* leave es->s_feature_*compat flags alone */
363 /* es->s_uuid will be set by e2fsck if empty */
364
365 /*
366 * The rest of the superblock fields should be zero, and if not it
367 * means they are likely already in use, so leave them alone. We
368 * can leave it up to e2fsck to clean up any inconsistencies there.
369 */
370}
371
372/*
373 * Open the external journal device
374 */
375static struct block_device *ext4_blkdev_get(dev_t dev)
376{
377 struct block_device *bdev;
378 char b[BDEVNAME_SIZE];
379
380 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
381 if (IS_ERR(bdev))
382 goto fail;
383 return bdev;
384
385fail:
386 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
387 __bdevname(dev, b), PTR_ERR(bdev));
388 return NULL;
389}
390
391/*
392 * Release the journal device
393 */
394static int ext4_blkdev_put(struct block_device *bdev)
395{
396 bd_release(bdev);
397 return blkdev_put(bdev);
398}
399
400static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
401{
402 struct block_device *bdev;
403 int ret = -ENODEV;
404
405 bdev = sbi->journal_bdev;
406 if (bdev) {
407 ret = ext4_blkdev_put(bdev);
408 sbi->journal_bdev = NULL;
409 }
410 return ret;
411}
412
413static inline struct inode *orphan_list_entry(struct list_head *l)
414{
415 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
416}
417
418static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
419{
420 struct list_head *l;
421
422 printk(KERN_ERR "sb orphan head is %d\n",
423 le32_to_cpu(sbi->s_es->s_last_orphan));
424
425 printk(KERN_ERR "sb_info orphan list:\n");
426 list_for_each(l, &sbi->s_orphan) {
427 struct inode *inode = orphan_list_entry(l);
428 printk(KERN_ERR " "
429 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
430 inode->i_sb->s_id, inode->i_ino, inode,
431 inode->i_mode, inode->i_nlink,
432 NEXT_ORPHAN(inode));
433 }
434}
435
436static void ext4_put_super (struct super_block * sb)
437{
438 struct ext4_sb_info *sbi = EXT4_SB(sb);
439 struct ext4_super_block *es = sbi->s_es;
440 int i;
441
442 ext4_ext_release(sb);
443 ext4_xattr_put_super(sb);
444 jbd2_journal_destroy(sbi->s_journal);
445 if (!(sb->s_flags & MS_RDONLY)) {
446 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
447 es->s_state = cpu_to_le16(sbi->s_mount_state);
448 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
449 mark_buffer_dirty(sbi->s_sbh);
450 ext4_commit_super(sb, es, 1);
451 }
452
453 for (i = 0; i < sbi->s_gdb_count; i++)
454 brelse(sbi->s_group_desc[i]);
455 kfree(sbi->s_group_desc);
456 percpu_counter_destroy(&sbi->s_freeblocks_counter);
457 percpu_counter_destroy(&sbi->s_freeinodes_counter);
458 percpu_counter_destroy(&sbi->s_dirs_counter);
459 brelse(sbi->s_sbh);
460#ifdef CONFIG_QUOTA
461 for (i = 0; i < MAXQUOTAS; i++)
462 kfree(sbi->s_qf_names[i]);
463#endif
464
465 /* Debugging code just in case the in-memory inode orphan list
466 * isn't empty. The on-disk one can be non-empty if we've
467 * detected an error and taken the fs readonly, but the
468 * in-memory list had better be clean by this point. */
469 if (!list_empty(&sbi->s_orphan))
470 dump_orphan_list(sb, sbi);
471 J_ASSERT(list_empty(&sbi->s_orphan));
472
473 invalidate_bdev(sb->s_bdev, 0);
474 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
475 /*
476 * Invalidate the journal device's buffers. We don't want them
477 * floating about in memory - the physical journal device may
478 * hotswapped, and it breaks the `ro-after' testing code.
479 */
480 sync_blockdev(sbi->journal_bdev);
481 invalidate_bdev(sbi->journal_bdev, 0);
482 ext4_blkdev_remove(sbi);
483 }
484 sb->s_fs_info = NULL;
485 kfree(sbi);
486 return;
487}
488
489static kmem_cache_t *ext4_inode_cachep;
490
491/*
492 * Called inside transaction, so use GFP_NOFS
493 */
494static struct inode *ext4_alloc_inode(struct super_block *sb)
495{
496 struct ext4_inode_info *ei;
497
498 ei = kmem_cache_alloc(ext4_inode_cachep, SLAB_NOFS);
499 if (!ei)
500 return NULL;
501#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
502 ei->i_acl = EXT4_ACL_NOT_CACHED;
503 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
504#endif
505 ei->i_block_alloc_info = NULL;
506 ei->vfs_inode.i_version = 1;
507 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
508 return &ei->vfs_inode;
509}
510
511static void ext4_destroy_inode(struct inode *inode)
512{
513 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
514}
515
516static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
517{
518 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
519
520 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
521 SLAB_CTOR_CONSTRUCTOR) {
522 INIT_LIST_HEAD(&ei->i_orphan);
523#ifdef CONFIG_EXT4DEV_FS_XATTR
524 init_rwsem(&ei->xattr_sem);
525#endif
526 mutex_init(&ei->truncate_mutex);
527 inode_init_once(&ei->vfs_inode);
528 }
529}
530
531static int init_inodecache(void)
532{
533 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
534 sizeof(struct ext4_inode_info),
535 0, (SLAB_RECLAIM_ACCOUNT|
536 SLAB_MEM_SPREAD),
537 init_once, NULL);
538 if (ext4_inode_cachep == NULL)
539 return -ENOMEM;
540 return 0;
541}
542
543static void destroy_inodecache(void)
544{
545 kmem_cache_destroy(ext4_inode_cachep);
546}
547
548static void ext4_clear_inode(struct inode *inode)
549{
550 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
551#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
552 if (EXT4_I(inode)->i_acl &&
553 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
554 posix_acl_release(EXT4_I(inode)->i_acl);
555 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
556 }
557 if (EXT4_I(inode)->i_default_acl &&
558 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
559 posix_acl_release(EXT4_I(inode)->i_default_acl);
560 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
561 }
562#endif
563 ext4_discard_reservation(inode);
564 EXT4_I(inode)->i_block_alloc_info = NULL;
565 if (unlikely(rsv))
566 kfree(rsv);
567}
568
569static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
570{
571#if defined(CONFIG_QUOTA)
572 struct ext4_sb_info *sbi = EXT4_SB(sb);
573
574 if (sbi->s_jquota_fmt)
575 seq_printf(seq, ",jqfmt=%s",
576 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
577
578 if (sbi->s_qf_names[USRQUOTA])
579 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
580
581 if (sbi->s_qf_names[GRPQUOTA])
582 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
583
584 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
585 seq_puts(seq, ",usrquota");
586
587 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
588 seq_puts(seq, ",grpquota");
589#endif
590}
591
592static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
593{
594 struct super_block *sb = vfs->mnt_sb;
595
596 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
597 seq_puts(seq, ",data=journal");
598 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
599 seq_puts(seq, ",data=ordered");
600 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
601 seq_puts(seq, ",data=writeback");
602
603 ext4_show_quota_options(seq, sb);
604
605 return 0;
606}
607
608
609static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
610{
611 __u32 *objp = vobjp;
612 unsigned long ino = objp[0];
613 __u32 generation = objp[1];
614 struct inode *inode;
615 struct dentry *result;
616
617 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
618 return ERR_PTR(-ESTALE);
619 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
620 return ERR_PTR(-ESTALE);
621
622 /* iget isn't really right if the inode is currently unallocated!!
623 *
624 * ext4_read_inode will return a bad_inode if the inode had been
625 * deleted, so we should be safe.
626 *
627 * Currently we don't know the generation for parent directory, so
628 * a generation of 0 means "accept any"
629 */
630 inode = iget(sb, ino);
631 if (inode == NULL)
632 return ERR_PTR(-ENOMEM);
633 if (is_bad_inode(inode) ||
634 (generation && inode->i_generation != generation)) {
635 iput(inode);
636 return ERR_PTR(-ESTALE);
637 }
638 /* now to find a dentry.
639 * If possible, get a well-connected one
640 */
641 result = d_alloc_anon(inode);
642 if (!result) {
643 iput(inode);
644 return ERR_PTR(-ENOMEM);
645 }
646 return result;
647}
648
649#ifdef CONFIG_QUOTA
650#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
651#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
652
653static int ext4_dquot_initialize(struct inode *inode, int type);
654static int ext4_dquot_drop(struct inode *inode);
655static int ext4_write_dquot(struct dquot *dquot);
656static int ext4_acquire_dquot(struct dquot *dquot);
657static int ext4_release_dquot(struct dquot *dquot);
658static int ext4_mark_dquot_dirty(struct dquot *dquot);
659static int ext4_write_info(struct super_block *sb, int type);
660static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
661static int ext4_quota_on_mount(struct super_block *sb, int type);
662static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
663 size_t len, loff_t off);
664static ssize_t ext4_quota_write(struct super_block *sb, int type,
665 const char *data, size_t len, loff_t off);
666
667static struct dquot_operations ext4_quota_operations = {
668 .initialize = ext4_dquot_initialize,
669 .drop = ext4_dquot_drop,
670 .alloc_space = dquot_alloc_space,
671 .alloc_inode = dquot_alloc_inode,
672 .free_space = dquot_free_space,
673 .free_inode = dquot_free_inode,
674 .transfer = dquot_transfer,
675 .write_dquot = ext4_write_dquot,
676 .acquire_dquot = ext4_acquire_dquot,
677 .release_dquot = ext4_release_dquot,
678 .mark_dirty = ext4_mark_dquot_dirty,
679 .write_info = ext4_write_info
680};
681
682static struct quotactl_ops ext4_qctl_operations = {
683 .quota_on = ext4_quota_on,
684 .quota_off = vfs_quota_off,
685 .quota_sync = vfs_quota_sync,
686 .get_info = vfs_get_dqinfo,
687 .set_info = vfs_set_dqinfo,
688 .get_dqblk = vfs_get_dqblk,
689 .set_dqblk = vfs_set_dqblk
690};
691#endif
692
693static struct super_operations ext4_sops = {
694 .alloc_inode = ext4_alloc_inode,
695 .destroy_inode = ext4_destroy_inode,
696 .read_inode = ext4_read_inode,
697 .write_inode = ext4_write_inode,
698 .dirty_inode = ext4_dirty_inode,
699 .delete_inode = ext4_delete_inode,
700 .put_super = ext4_put_super,
701 .write_super = ext4_write_super,
702 .sync_fs = ext4_sync_fs,
703 .write_super_lockfs = ext4_write_super_lockfs,
704 .unlockfs = ext4_unlockfs,
705 .statfs = ext4_statfs,
706 .remount_fs = ext4_remount,
707 .clear_inode = ext4_clear_inode,
708 .show_options = ext4_show_options,
709#ifdef CONFIG_QUOTA
710 .quota_read = ext4_quota_read,
711 .quota_write = ext4_quota_write,
712#endif
713};
714
715static struct export_operations ext4_export_ops = {
716 .get_parent = ext4_get_parent,
717 .get_dentry = ext4_get_dentry,
718};
719
720enum {
721 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
722 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
723 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
724 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
725 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
726 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
727 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
728 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
729 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
730 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
731 Opt_grpquota, Opt_extents,
732};
733
734static match_table_t tokens = {
735 {Opt_bsd_df, "bsddf"},
736 {Opt_minix_df, "minixdf"},
737 {Opt_grpid, "grpid"},
738 {Opt_grpid, "bsdgroups"},
739 {Opt_nogrpid, "nogrpid"},
740 {Opt_nogrpid, "sysvgroups"},
741 {Opt_resgid, "resgid=%u"},
742 {Opt_resuid, "resuid=%u"},
743 {Opt_sb, "sb=%u"},
744 {Opt_err_cont, "errors=continue"},
745 {Opt_err_panic, "errors=panic"},
746 {Opt_err_ro, "errors=remount-ro"},
747 {Opt_nouid32, "nouid32"},
748 {Opt_nocheck, "nocheck"},
749 {Opt_nocheck, "check=none"},
750 {Opt_debug, "debug"},
751 {Opt_oldalloc, "oldalloc"},
752 {Opt_orlov, "orlov"},
753 {Opt_user_xattr, "user_xattr"},
754 {Opt_nouser_xattr, "nouser_xattr"},
755 {Opt_acl, "acl"},
756 {Opt_noacl, "noacl"},
757 {Opt_reservation, "reservation"},
758 {Opt_noreservation, "noreservation"},
759 {Opt_noload, "noload"},
760 {Opt_nobh, "nobh"},
761 {Opt_bh, "bh"},
762 {Opt_commit, "commit=%u"},
763 {Opt_journal_update, "journal=update"},
764 {Opt_journal_inum, "journal=%u"},
765 {Opt_journal_dev, "journal_dev=%u"},
766 {Opt_abort, "abort"},
767 {Opt_data_journal, "data=journal"},
768 {Opt_data_ordered, "data=ordered"},
769 {Opt_data_writeback, "data=writeback"},
770 {Opt_offusrjquota, "usrjquota="},
771 {Opt_usrjquota, "usrjquota=%s"},
772 {Opt_offgrpjquota, "grpjquota="},
773 {Opt_grpjquota, "grpjquota=%s"},
774 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
775 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
776 {Opt_grpquota, "grpquota"},
777 {Opt_noquota, "noquota"},
778 {Opt_quota, "quota"},
779 {Opt_usrquota, "usrquota"},
780 {Opt_barrier, "barrier=%u"},
781 {Opt_extents, "extents"},
782 {Opt_err, NULL},
783 {Opt_resize, "resize"},
784};
785
786static ext4_fsblk_t get_sb_block(void **data)
787{
788 ext4_fsblk_t sb_block;
789 char *options = (char *) *data;
790
791 if (!options || strncmp(options, "sb=", 3) != 0)
792 return 1; /* Default location */
793 options += 3;
794 /*todo: use simple_strtoll with >32bit ext4 */
795 sb_block = simple_strtoul(options, &options, 0);
796 if (*options && *options != ',') {
797 printk("EXT4-fs: Invalid sb specification: %s\n",
798 (char *) *data);
799 return 1;
800 }
801 if (*options == ',')
802 options++;
803 *data = (void *) options;
804 return sb_block;
805}
806
807static int parse_options (char *options, struct super_block *sb,
808 unsigned int *inum, unsigned long *journal_devnum,
809 ext4_fsblk_t *n_blocks_count, int is_remount)
810{
811 struct ext4_sb_info *sbi = EXT4_SB(sb);
812 char * p;
813 substring_t args[MAX_OPT_ARGS];
814 int data_opt = 0;
815 int option;
816#ifdef CONFIG_QUOTA
817 int qtype;
818 char *qname;
819#endif
820
821 if (!options)
822 return 1;
823
824 while ((p = strsep (&options, ",")) != NULL) {
825 int token;
826 if (!*p)
827 continue;
828
829 token = match_token(p, tokens, args);
830 switch (token) {
831 case Opt_bsd_df:
832 clear_opt (sbi->s_mount_opt, MINIX_DF);
833 break;
834 case Opt_minix_df:
835 set_opt (sbi->s_mount_opt, MINIX_DF);
836 break;
837 case Opt_grpid:
838 set_opt (sbi->s_mount_opt, GRPID);
839 break;
840 case Opt_nogrpid:
841 clear_opt (sbi->s_mount_opt, GRPID);
842 break;
843 case Opt_resuid:
844 if (match_int(&args[0], &option))
845 return 0;
846 sbi->s_resuid = option;
847 break;
848 case Opt_resgid:
849 if (match_int(&args[0], &option))
850 return 0;
851 sbi->s_resgid = option;
852 break;
853 case Opt_sb:
854 /* handled by get_sb_block() instead of here */
855 /* *sb_block = match_int(&args[0]); */
856 break;
857 case Opt_err_panic:
858 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
859 clear_opt (sbi->s_mount_opt, ERRORS_RO);
860 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
861 break;
862 case Opt_err_ro:
863 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
864 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
865 set_opt (sbi->s_mount_opt, ERRORS_RO);
866 break;
867 case Opt_err_cont:
868 clear_opt (sbi->s_mount_opt, ERRORS_RO);
869 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
870 set_opt (sbi->s_mount_opt, ERRORS_CONT);
871 break;
872 case Opt_nouid32:
873 set_opt (sbi->s_mount_opt, NO_UID32);
874 break;
875 case Opt_nocheck:
876 clear_opt (sbi->s_mount_opt, CHECK);
877 break;
878 case Opt_debug:
879 set_opt (sbi->s_mount_opt, DEBUG);
880 break;
881 case Opt_oldalloc:
882 set_opt (sbi->s_mount_opt, OLDALLOC);
883 break;
884 case Opt_orlov:
885 clear_opt (sbi->s_mount_opt, OLDALLOC);
886 break;
887#ifdef CONFIG_EXT4DEV_FS_XATTR
888 case Opt_user_xattr:
889 set_opt (sbi->s_mount_opt, XATTR_USER);
890 break;
891 case Opt_nouser_xattr:
892 clear_opt (sbi->s_mount_opt, XATTR_USER);
893 break;
894#else
895 case Opt_user_xattr:
896 case Opt_nouser_xattr:
897 printk("EXT4 (no)user_xattr options not supported\n");
898 break;
899#endif
900#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
901 case Opt_acl:
902 set_opt(sbi->s_mount_opt, POSIX_ACL);
903 break;
904 case Opt_noacl:
905 clear_opt(sbi->s_mount_opt, POSIX_ACL);
906 break;
907#else
908 case Opt_acl:
909 case Opt_noacl:
910 printk("EXT4 (no)acl options not supported\n");
911 break;
912#endif
913 case Opt_reservation:
914 set_opt(sbi->s_mount_opt, RESERVATION);
915 break;
916 case Opt_noreservation:
917 clear_opt(sbi->s_mount_opt, RESERVATION);
918 break;
919 case Opt_journal_update:
920 /* @@@ FIXME */
921 /* Eventually we will want to be able to create
922 a journal file here. For now, only allow the
923 user to specify an existing inode to be the
924 journal file. */
925 if (is_remount) {
926 printk(KERN_ERR "EXT4-fs: cannot specify "
927 "journal on remount\n");
928 return 0;
929 }
930 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
931 break;
932 case Opt_journal_inum:
933 if (is_remount) {
934 printk(KERN_ERR "EXT4-fs: cannot specify "
935 "journal on remount\n");
936 return 0;
937 }
938 if (match_int(&args[0], &option))
939 return 0;
940 *inum = option;
941 break;
942 case Opt_journal_dev:
943 if (is_remount) {
944 printk(KERN_ERR "EXT4-fs: cannot specify "
945 "journal on remount\n");
946 return 0;
947 }
948 if (match_int(&args[0], &option))
949 return 0;
950 *journal_devnum = option;
951 break;
952 case Opt_noload:
953 set_opt (sbi->s_mount_opt, NOLOAD);
954 break;
955 case Opt_commit:
956 if (match_int(&args[0], &option))
957 return 0;
958 if (option < 0)
959 return 0;
960 if (option == 0)
961 option = JBD_DEFAULT_MAX_COMMIT_AGE;
962 sbi->s_commit_interval = HZ * option;
963 break;
964 case Opt_data_journal:
965 data_opt = EXT4_MOUNT_JOURNAL_DATA;
966 goto datacheck;
967 case Opt_data_ordered:
968 data_opt = EXT4_MOUNT_ORDERED_DATA;
969 goto datacheck;
970 case Opt_data_writeback:
971 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
972 datacheck:
973 if (is_remount) {
974 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
975 != data_opt) {
976 printk(KERN_ERR
977 "EXT4-fs: cannot change data "
978 "mode on remount\n");
979 return 0;
980 }
981 } else {
982 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
983 sbi->s_mount_opt |= data_opt;
984 }
985 break;
986#ifdef CONFIG_QUOTA
987 case Opt_usrjquota:
988 qtype = USRQUOTA;
989 goto set_qf_name;
990 case Opt_grpjquota:
991 qtype = GRPQUOTA;
992set_qf_name:
993 if (sb_any_quota_enabled(sb)) {
994 printk(KERN_ERR
995 "EXT4-fs: Cannot change journalled "
996 "quota options when quota turned on.\n");
997 return 0;
998 }
999 qname = match_strdup(&args[0]);
1000 if (!qname) {
1001 printk(KERN_ERR
1002 "EXT4-fs: not enough memory for "
1003 "storing quotafile name.\n");
1004 return 0;
1005 }
1006 if (sbi->s_qf_names[qtype] &&
1007 strcmp(sbi->s_qf_names[qtype], qname)) {
1008 printk(KERN_ERR
1009 "EXT4-fs: %s quota file already "
1010 "specified.\n", QTYPE2NAME(qtype));
1011 kfree(qname);
1012 return 0;
1013 }
1014 sbi->s_qf_names[qtype] = qname;
1015 if (strchr(sbi->s_qf_names[qtype], '/')) {
1016 printk(KERN_ERR
1017 "EXT4-fs: quotafile must be on "
1018 "filesystem root.\n");
1019 kfree(sbi->s_qf_names[qtype]);
1020 sbi->s_qf_names[qtype] = NULL;
1021 return 0;
1022 }
1023 set_opt(sbi->s_mount_opt, QUOTA);
1024 break;
1025 case Opt_offusrjquota:
1026 qtype = USRQUOTA;
1027 goto clear_qf_name;
1028 case Opt_offgrpjquota:
1029 qtype = GRPQUOTA;
1030clear_qf_name:
1031 if (sb_any_quota_enabled(sb)) {
1032 printk(KERN_ERR "EXT4-fs: Cannot change "
1033 "journalled quota options when "
1034 "quota turned on.\n");
1035 return 0;
1036 }
1037 /*
1038 * The space will be released later when all options
1039 * are confirmed to be correct
1040 */
1041 sbi->s_qf_names[qtype] = NULL;
1042 break;
1043 case Opt_jqfmt_vfsold:
1044 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1045 break;
1046 case Opt_jqfmt_vfsv0:
1047 sbi->s_jquota_fmt = QFMT_VFS_V0;
1048 break;
1049 case Opt_quota:
1050 case Opt_usrquota:
1051 set_opt(sbi->s_mount_opt, QUOTA);
1052 set_opt(sbi->s_mount_opt, USRQUOTA);
1053 break;
1054 case Opt_grpquota:
1055 set_opt(sbi->s_mount_opt, QUOTA);
1056 set_opt(sbi->s_mount_opt, GRPQUOTA);
1057 break;
1058 case Opt_noquota:
1059 if (sb_any_quota_enabled(sb)) {
1060 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1061 "options when quota turned on.\n");
1062 return 0;
1063 }
1064 clear_opt(sbi->s_mount_opt, QUOTA);
1065 clear_opt(sbi->s_mount_opt, USRQUOTA);
1066 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1067 break;
1068#else
1069 case Opt_quota:
1070 case Opt_usrquota:
1071 case Opt_grpquota:
1072 case Opt_usrjquota:
1073 case Opt_grpjquota:
1074 case Opt_offusrjquota:
1075 case Opt_offgrpjquota:
1076 case Opt_jqfmt_vfsold:
1077 case Opt_jqfmt_vfsv0:
1078 printk(KERN_ERR
1079 "EXT4-fs: journalled quota options not "
1080 "supported.\n");
1081 break;
1082 case Opt_noquota:
1083 break;
1084#endif
1085 case Opt_abort:
1086 set_opt(sbi->s_mount_opt, ABORT);
1087 break;
1088 case Opt_barrier:
1089 if (match_int(&args[0], &option))
1090 return 0;
1091 if (option)
1092 set_opt(sbi->s_mount_opt, BARRIER);
1093 else
1094 clear_opt(sbi->s_mount_opt, BARRIER);
1095 break;
1096 case Opt_ignore:
1097 break;
1098 case Opt_resize:
1099 if (!is_remount) {
1100 printk("EXT4-fs: resize option only available "
1101 "for remount\n");
1102 return 0;
1103 }
1104 if (match_int(&args[0], &option) != 0)
1105 return 0;
1106 *n_blocks_count = option;
1107 break;
1108 case Opt_nobh:
1109 set_opt(sbi->s_mount_opt, NOBH);
1110 break;
1111 case Opt_bh:
1112 clear_opt(sbi->s_mount_opt, NOBH);
1113 break;
1114 case Opt_extents:
1115 set_opt (sbi->s_mount_opt, EXTENTS);
1116 break;
1117 default:
1118 printk (KERN_ERR
1119 "EXT4-fs: Unrecognized mount option \"%s\" "
1120 "or missing value\n", p);
1121 return 0;
1122 }
1123 }
1124#ifdef CONFIG_QUOTA
1125 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1126 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1127 sbi->s_qf_names[USRQUOTA])
1128 clear_opt(sbi->s_mount_opt, USRQUOTA);
1129
1130 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1131 sbi->s_qf_names[GRPQUOTA])
1132 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1133
1134 if ((sbi->s_qf_names[USRQUOTA] &&
1135 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1136 (sbi->s_qf_names[GRPQUOTA] &&
1137 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1138 printk(KERN_ERR "EXT4-fs: old and new quota "
1139 "format mixing.\n");
1140 return 0;
1141 }
1142
1143 if (!sbi->s_jquota_fmt) {
1144 printk(KERN_ERR "EXT4-fs: journalled quota format "
1145 "not specified.\n");
1146 return 0;
1147 }
1148 } else {
1149 if (sbi->s_jquota_fmt) {
1150 printk(KERN_ERR "EXT4-fs: journalled quota format "
1151 "specified with no journalling "
1152 "enabled.\n");
1153 return 0;
1154 }
1155 }
1156#endif
1157 return 1;
1158}
1159
1160static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1161 int read_only)
1162{
1163 struct ext4_sb_info *sbi = EXT4_SB(sb);
1164 int res = 0;
1165
1166 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1167 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1168 "forcing read-only mode\n");
1169 res = MS_RDONLY;
1170 }
1171 if (read_only)
1172 return res;
1173 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1174 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1175 "running e2fsck is recommended\n");
1176 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1177 printk (KERN_WARNING
1178 "EXT4-fs warning: mounting fs with errors, "
1179 "running e2fsck is recommended\n");
1180 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1181 le16_to_cpu(es->s_mnt_count) >=
1182 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1183 printk (KERN_WARNING
1184 "EXT4-fs warning: maximal mount count reached, "
1185 "running e2fsck is recommended\n");
1186 else if (le32_to_cpu(es->s_checkinterval) &&
1187 (le32_to_cpu(es->s_lastcheck) +
1188 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1189 printk (KERN_WARNING
1190 "EXT4-fs warning: checktime reached, "
1191 "running e2fsck is recommended\n");
1192#if 0
1193 /* @@@ We _will_ want to clear the valid bit if we find
1194 * inconsistencies, to force a fsck at reboot. But for
1195 * a plain journaled filesystem we can keep it set as
1196 * valid forever! :)
1197 */
1198 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1199#endif
1200 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1201 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1202 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1203 es->s_mtime = cpu_to_le32(get_seconds());
1204 ext4_update_dynamic_rev(sb);
1205 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1206
1207 ext4_commit_super(sb, es, 1);
1208 if (test_opt(sb, DEBUG))
1209 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1210 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1211 sb->s_blocksize,
1212 sbi->s_groups_count,
1213 EXT4_BLOCKS_PER_GROUP(sb),
1214 EXT4_INODES_PER_GROUP(sb),
1215 sbi->s_mount_opt);
1216
1217 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1218 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1219 char b[BDEVNAME_SIZE];
1220
1221 printk("external journal on %s\n",
1222 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1223 } else {
1224 printk("internal journal\n");
1225 }
1226 return res;
1227}
1228
1229/* Called at mount-time, super-block is locked */
1230static int ext4_check_descriptors (struct super_block * sb)
1231{
1232 struct ext4_sb_info *sbi = EXT4_SB(sb);
1233 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1234 ext4_fsblk_t last_block;
1235 ext4_fsblk_t block_bitmap;
1236 ext4_fsblk_t inode_bitmap;
1237 ext4_fsblk_t inode_table;
1238 struct ext4_group_desc * gdp = NULL;
1239 int desc_block = 0;
1240 int i;
1241
1242 ext4_debug ("Checking group descriptors");
1243
1244 for (i = 0; i < sbi->s_groups_count; i++)
1245 {
1246 if (i == sbi->s_groups_count - 1)
1247 last_block = ext4_blocks_count(sbi->s_es) - 1;
1248 else
1249 last_block = first_block +
1250 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1251
1252 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1253 gdp = (struct ext4_group_desc *)
1254 sbi->s_group_desc[desc_block++]->b_data;
1255 block_bitmap = ext4_block_bitmap(sb, gdp);
1256 if (block_bitmap < first_block || block_bitmap > last_block)
1257 {
1258 ext4_error (sb, "ext4_check_descriptors",
1259 "Block bitmap for group %d"
1260 " not in group (block %llu)!",
1261 i, block_bitmap);
1262 return 0;
1263 }
1264 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1265 if (inode_bitmap < first_block || inode_bitmap > last_block)
1266 {
1267 ext4_error (sb, "ext4_check_descriptors",
1268 "Inode bitmap for group %d"
1269 " not in group (block %llu)!",
1270 i, inode_bitmap);
1271 return 0;
1272 }
1273 inode_table = ext4_inode_table(sb, gdp);
1274 if (inode_table < first_block ||
1275 inode_table + sbi->s_itb_per_group > last_block)
1276 {
1277 ext4_error (sb, "ext4_check_descriptors",
1278 "Inode table for group %d"
1279 " not in group (block %llu)!",
1280 i, inode_table);
1281 return 0;
1282 }
1283 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1284 gdp = (struct ext4_group_desc *)
1285 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1286 }
1287
1288 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1289 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1290 return 1;
1291}
1292
1293
1294/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1295 * the superblock) which were deleted from all directories, but held open by
1296 * a process at the time of a crash. We walk the list and try to delete these
1297 * inodes at recovery time (only with a read-write filesystem).
1298 *
1299 * In order to keep the orphan inode chain consistent during traversal (in
1300 * case of crash during recovery), we link each inode into the superblock
1301 * orphan list_head and handle it the same way as an inode deletion during
1302 * normal operation (which journals the operations for us).
1303 *
1304 * We only do an iget() and an iput() on each inode, which is very safe if we
1305 * accidentally point at an in-use or already deleted inode. The worst that
1306 * can happen in this case is that we get a "bit already cleared" message from
1307 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1308 * e2fsck was run on this filesystem, and it must have already done the orphan
1309 * inode cleanup for us, so we can safely abort without any further action.
1310 */
1311static void ext4_orphan_cleanup (struct super_block * sb,
1312 struct ext4_super_block * es)
1313{
1314 unsigned int s_flags = sb->s_flags;
1315 int nr_orphans = 0, nr_truncates = 0;
1316#ifdef CONFIG_QUOTA
1317 int i;
1318#endif
1319 if (!es->s_last_orphan) {
1320 jbd_debug(4, "no orphan inodes to clean up\n");
1321 return;
1322 }
1323
1324 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1325 if (es->s_last_orphan)
1326 jbd_debug(1, "Errors on filesystem, "
1327 "clearing orphan list.\n");
1328 es->s_last_orphan = 0;
1329 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1330 return;
1331 }
1332
1333 if (s_flags & MS_RDONLY) {
1334 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1335 sb->s_id);
1336 sb->s_flags &= ~MS_RDONLY;
1337 }
1338#ifdef CONFIG_QUOTA
1339 /* Needed for iput() to work correctly and not trash data */
1340 sb->s_flags |= MS_ACTIVE;
1341 /* Turn on quotas so that they are updated correctly */
1342 for (i = 0; i < MAXQUOTAS; i++) {
1343 if (EXT4_SB(sb)->s_qf_names[i]) {
1344 int ret = ext4_quota_on_mount(sb, i);
1345 if (ret < 0)
1346 printk(KERN_ERR
1347 "EXT4-fs: Cannot turn on journalled "
1348 "quota: error %d\n", ret);
1349 }
1350 }
1351#endif
1352
1353 while (es->s_last_orphan) {
1354 struct inode *inode;
1355
1356 if (!(inode =
1357 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1358 es->s_last_orphan = 0;
1359 break;
1360 }
1361
1362 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1363 DQUOT_INIT(inode);
1364 if (inode->i_nlink) {
1365 printk(KERN_DEBUG
1366 "%s: truncating inode %lu to %Ld bytes\n",
1367 __FUNCTION__, inode->i_ino, inode->i_size);
1368 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1369 inode->i_ino, inode->i_size);
1370 ext4_truncate(inode);
1371 nr_truncates++;
1372 } else {
1373 printk(KERN_DEBUG
1374 "%s: deleting unreferenced inode %lu\n",
1375 __FUNCTION__, inode->i_ino);
1376 jbd_debug(2, "deleting unreferenced inode %lu\n",
1377 inode->i_ino);
1378 nr_orphans++;
1379 }
1380 iput(inode); /* The delete magic happens here! */
1381 }
1382
1383#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1384
1385 if (nr_orphans)
1386 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1387 sb->s_id, PLURAL(nr_orphans));
1388 if (nr_truncates)
1389 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1390 sb->s_id, PLURAL(nr_truncates));
1391#ifdef CONFIG_QUOTA
1392 /* Turn quotas off */
1393 for (i = 0; i < MAXQUOTAS; i++) {
1394 if (sb_dqopt(sb)->files[i])
1395 vfs_quota_off(sb, i);
1396 }
1397#endif
1398 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1399}
1400
1401#define log2(n) ffz(~(n))
1402
1403/*
1404 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1405 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1406 * We need to be 1 filesystem block less than the 2^32 sector limit.
1407 */
1408static loff_t ext4_max_size(int bits)
1409{
1410 loff_t res = EXT4_NDIR_BLOCKS;
1411 /* This constant is calculated to be the largest file size for a
1412 * dense, 4k-blocksize file such that the total number of
1413 * sectors in the file, including data and all indirect blocks,
1414 * does not exceed 2^32. */
1415 const loff_t upper_limit = 0x1ff7fffd000LL;
1416
1417 res += 1LL << (bits-2);
1418 res += 1LL << (2*(bits-2));
1419 res += 1LL << (3*(bits-2));
1420 res <<= bits;
1421 if (res > upper_limit)
1422 res = upper_limit;
1423 return res;
1424}
1425
1426static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1427 ext4_fsblk_t logical_sb_block, int nr)
1428{
1429 struct ext4_sb_info *sbi = EXT4_SB(sb);
1430 unsigned long bg, first_meta_bg;
1431 int has_super = 0;
1432
1433 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1434
1435 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1436 nr < first_meta_bg)
1437 return logical_sb_block + nr + 1;
1438 bg = sbi->s_desc_per_block * nr;
1439 if (ext4_bg_has_super(sb, bg))
1440 has_super = 1;
1441 return (has_super + ext4_group_first_block_no(sb, bg));
1442}
1443
1444
1445static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1446{
1447 struct buffer_head * bh;
1448 struct ext4_super_block *es = NULL;
1449 struct ext4_sb_info *sbi;
1450 ext4_fsblk_t block;
1451 ext4_fsblk_t sb_block = get_sb_block(&data);
1452 ext4_fsblk_t logical_sb_block;
1453 unsigned long offset = 0;
1454 unsigned int journal_inum = 0;
1455 unsigned long journal_devnum = 0;
1456 unsigned long def_mount_opts;
1457 struct inode *root;
1458 int blocksize;
1459 int hblock;
1460 int db_count;
1461 int i;
1462 int needs_recovery;
1463 __le32 features;
1464 __u64 blocks_count;
1465
1466 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1467 if (!sbi)
1468 return -ENOMEM;
1469 sb->s_fs_info = sbi;
1470 sbi->s_mount_opt = 0;
1471 sbi->s_resuid = EXT4_DEF_RESUID;
1472 sbi->s_resgid = EXT4_DEF_RESGID;
1473
1474 unlock_kernel();
1475
1476 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1477 if (!blocksize) {
1478 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1479 goto out_fail;
1480 }
1481
1482 /*
1483 * The ext4 superblock will not be buffer aligned for other than 1kB
1484 * block sizes. We need to calculate the offset from buffer start.
1485 */
1486 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1487 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1488 offset = do_div(logical_sb_block, blocksize);
1489 } else {
1490 logical_sb_block = sb_block;
1491 }
1492
1493 if (!(bh = sb_bread(sb, logical_sb_block))) {
1494 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1495 goto out_fail;
1496 }
1497 /*
1498 * Note: s_es must be initialized as soon as possible because
1499 * some ext4 macro-instructions depend on its value
1500 */
1501 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1502 sbi->s_es = es;
1503 sb->s_magic = le16_to_cpu(es->s_magic);
1504 if (sb->s_magic != EXT4_SUPER_MAGIC)
1505 goto cantfind_ext4;
1506
1507 /* Set defaults before we parse the mount options */
1508 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1509 if (def_mount_opts & EXT4_DEFM_DEBUG)
1510 set_opt(sbi->s_mount_opt, DEBUG);
1511 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1512 set_opt(sbi->s_mount_opt, GRPID);
1513 if (def_mount_opts & EXT4_DEFM_UID16)
1514 set_opt(sbi->s_mount_opt, NO_UID32);
1515 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1516 set_opt(sbi->s_mount_opt, XATTR_USER);
1517 if (def_mount_opts & EXT4_DEFM_ACL)
1518 set_opt(sbi->s_mount_opt, POSIX_ACL);
1519 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1520 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1521 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1522 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1523 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1524 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1525
1526 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1527 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1528 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1529 set_opt(sbi->s_mount_opt, ERRORS_RO);
1530 else
1531 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1532
1533 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1534 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1535
1536 set_opt(sbi->s_mount_opt, RESERVATION);
1537
1538 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1539 NULL, 0))
1540 goto failed_mount;
1541
1542 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1543 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1544
1545 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1546 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1547 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1548 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1549 printk(KERN_WARNING
1550 "EXT4-fs warning: feature flags set on rev 0 fs, "
1551 "running e2fsck is recommended\n");
1552 /*
1553 * Check feature flags regardless of the revision level, since we
1554 * previously didn't change the revision level when setting the flags,
1555 * so there is a chance incompat flags are set on a rev 0 filesystem.
1556 */
1557 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1558 if (features) {
1559 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1560 "unsupported optional features (%x).\n",
1561 sb->s_id, le32_to_cpu(features));
1562 goto failed_mount;
1563 }
1564 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1565 if (!(sb->s_flags & MS_RDONLY) && features) {
1566 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1567 "unsupported optional features (%x).\n",
1568 sb->s_id, le32_to_cpu(features));
1569 goto failed_mount;
1570 }
1571 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1572
1573 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1574 blocksize > EXT4_MAX_BLOCK_SIZE) {
1575 printk(KERN_ERR
1576 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1577 blocksize, sb->s_id);
1578 goto failed_mount;
1579 }
1580
1581 hblock = bdev_hardsect_size(sb->s_bdev);
1582 if (sb->s_blocksize != blocksize) {
1583 /*
1584 * Make sure the blocksize for the filesystem is larger
1585 * than the hardware sectorsize for the machine.
1586 */
1587 if (blocksize < hblock) {
1588 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1589 "device blocksize %d.\n", blocksize, hblock);
1590 goto failed_mount;
1591 }
1592
1593 brelse (bh);
1594 sb_set_blocksize(sb, blocksize);
1595 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1596 offset = do_div(logical_sb_block, blocksize);
1597 bh = sb_bread(sb, logical_sb_block);
1598 if (!bh) {
1599 printk(KERN_ERR
1600 "EXT4-fs: Can't read superblock on 2nd try.\n");
1601 goto failed_mount;
1602 }
1603 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1604 sbi->s_es = es;
1605 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1606 printk (KERN_ERR
1607 "EXT4-fs: Magic mismatch, very weird !\n");
1608 goto failed_mount;
1609 }
1610 }
1611
1612 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1613
1614 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1615 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1616 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1617 } else {
1618 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1619 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1620 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1621 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1622 (sbi->s_inode_size > blocksize)) {
1623 printk (KERN_ERR
1624 "EXT4-fs: unsupported inode size: %d\n",
1625 sbi->s_inode_size);
1626 goto failed_mount;
1627 }
1628 }
1629 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
1630 le32_to_cpu(es->s_log_frag_size);
1631 if (blocksize != sbi->s_frag_size) {
1632 printk(KERN_ERR
1633 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
1634 sbi->s_frag_size, blocksize);
1635 goto failed_mount;
1636 }
1637 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1638 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1639 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1640 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1641 sbi->s_desc_size & (sbi->s_desc_size - 1)) {
1642 printk(KERN_ERR
1643 "EXT4-fs: unsupported descriptor size %lu\n",
1644 sbi->s_desc_size);
1645 goto failed_mount;
1646 }
1647 } else
1648 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1649 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1650 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1651 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1652 if (EXT4_INODE_SIZE(sb) == 0)
1653 goto cantfind_ext4;
1654 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1655 if (sbi->s_inodes_per_block == 0)
1656 goto cantfind_ext4;
1657 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1658 sbi->s_inodes_per_block;
1659 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1660 sbi->s_sbh = bh;
1661 sbi->s_mount_state = le16_to_cpu(es->s_state);
1662 sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));
1663 sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb));
1664 for (i=0; i < 4; i++)
1665 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1666 sbi->s_def_hash_version = es->s_def_hash_version;
1667
1668 if (sbi->s_blocks_per_group > blocksize * 8) {
1669 printk (KERN_ERR
1670 "EXT4-fs: #blocks per group too big: %lu\n",
1671 sbi->s_blocks_per_group);
1672 goto failed_mount;
1673 }
1674 if (sbi->s_frags_per_group > blocksize * 8) {
1675 printk (KERN_ERR
1676 "EXT4-fs: #fragments per group too big: %lu\n",
1677 sbi->s_frags_per_group);
1678 goto failed_mount;
1679 }
1680 if (sbi->s_inodes_per_group > blocksize * 8) {
1681 printk (KERN_ERR
1682 "EXT4-fs: #inodes per group too big: %lu\n",
1683 sbi->s_inodes_per_group);
1684 goto failed_mount;
1685 }
1686
1687 if (ext4_blocks_count(es) >
1688 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1689 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1690 " too large to mount safely\n", sb->s_id);
1691 if (sizeof(sector_t) < 8)
1692 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1693 "enabled\n");
1694 goto failed_mount;
1695 }
1696
1697 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1698 goto cantfind_ext4;
1699 blocks_count = (ext4_blocks_count(es) -
1700 le32_to_cpu(es->s_first_data_block) +
1701 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1702 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1703 sbi->s_groups_count = blocks_count;
1704 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1705 EXT4_DESC_PER_BLOCK(sb);
1706 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1707 GFP_KERNEL);
1708 if (sbi->s_group_desc == NULL) {
1709 printk (KERN_ERR "EXT4-fs: not enough memory\n");
1710 goto failed_mount;
1711 }
1712
1713 bgl_lock_init(&sbi->s_blockgroup_lock);
1714
1715 for (i = 0; i < db_count; i++) {
1716 block = descriptor_loc(sb, logical_sb_block, i);
1717 sbi->s_group_desc[i] = sb_bread(sb, block);
1718 if (!sbi->s_group_desc[i]) {
1719 printk (KERN_ERR "EXT4-fs: "
1720 "can't read group descriptor %d\n", i);
1721 db_count = i;
1722 goto failed_mount2;
1723 }
1724 }
1725 if (!ext4_check_descriptors (sb)) {
1726 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1727 goto failed_mount2;
1728 }
1729 sbi->s_gdb_count = db_count;
1730 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1731 spin_lock_init(&sbi->s_next_gen_lock);
1732
1733 percpu_counter_init(&sbi->s_freeblocks_counter,
1734 ext4_count_free_blocks(sb));
1735 percpu_counter_init(&sbi->s_freeinodes_counter,
1736 ext4_count_free_inodes(sb));
1737 percpu_counter_init(&sbi->s_dirs_counter,
1738 ext4_count_dirs(sb));
1739
1740 /* per fileystem reservation list head & lock */
1741 spin_lock_init(&sbi->s_rsv_window_lock);
1742 sbi->s_rsv_window_root = RB_ROOT;
1743 /* Add a single, static dummy reservation to the start of the
1744 * reservation window list --- it gives us a placeholder for
1745 * append-at-start-of-list which makes the allocation logic
1746 * _much_ simpler. */
1747 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1748 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1749 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1750 sbi->s_rsv_window_head.rsv_goal_size = 0;
1751 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1752
1753 /*
1754 * set up enough so that it can read an inode
1755 */
1756 sb->s_op = &ext4_sops;
1757 sb->s_export_op = &ext4_export_ops;
1758 sb->s_xattr = ext4_xattr_handlers;
1759#ifdef CONFIG_QUOTA
1760 sb->s_qcop = &ext4_qctl_operations;
1761 sb->dq_op = &ext4_quota_operations;
1762#endif
1763 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1764
1765 sb->s_root = NULL;
1766
1767 needs_recovery = (es->s_last_orphan != 0 ||
1768 EXT4_HAS_INCOMPAT_FEATURE(sb,
1769 EXT4_FEATURE_INCOMPAT_RECOVER));
1770
1771 /*
1772 * The first inode we look at is the journal inode. Don't try
1773 * root first: it may be modified in the journal!
1774 */
1775 if (!test_opt(sb, NOLOAD) &&
1776 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1777 if (ext4_load_journal(sb, es, journal_devnum))
1778 goto failed_mount3;
1779 } else if (journal_inum) {
1780 if (ext4_create_journal(sb, es, journal_inum))
1781 goto failed_mount3;
1782 } else {
1783 if (!silent)
1784 printk (KERN_ERR
1785 "ext4: No journal on filesystem on %s\n",
1786 sb->s_id);
1787 goto failed_mount3;
1788 }
1789
1790 /* We have now updated the journal if required, so we can
1791 * validate the data journaling mode. */
1792 switch (test_opt(sb, DATA_FLAGS)) {
1793 case 0:
1794 /* No mode set, assume a default based on the journal
1795 * capabilities: ORDERED_DATA if the journal can
1796 * cope, else JOURNAL_DATA
1797 */
1798 if (jbd2_journal_check_available_features
1799 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1800 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1801 else
1802 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1803 break;
1804
1805 case EXT4_MOUNT_ORDERED_DATA:
1806 case EXT4_MOUNT_WRITEBACK_DATA:
1807 if (!jbd2_journal_check_available_features
1808 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1809 printk(KERN_ERR "EXT4-fs: Journal does not support "
1810 "requested data journaling mode\n");
1811 goto failed_mount4;
1812 }
1813 default:
1814 break;
1815 }
1816
1817 if (test_opt(sb, NOBH)) {
1818 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1819 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1820 "its supported only with writeback mode\n");
1821 clear_opt(sbi->s_mount_opt, NOBH);
1822 }
1823 }
1824 /*
1825 * The jbd2_journal_load will have done any necessary log recovery,
1826 * so we can safely mount the rest of the filesystem now.
1827 */
1828
1829 root = iget(sb, EXT4_ROOT_INO);
1830 sb->s_root = d_alloc_root(root);
1831 if (!sb->s_root) {
1832 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1833 iput(root);
1834 goto failed_mount4;
1835 }
1836 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1837 dput(sb->s_root);
1838 sb->s_root = NULL;
1839 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1840 goto failed_mount4;
1841 }
1842
1843 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1844 /*
1845 * akpm: core read_super() calls in here with the superblock locked.
1846 * That deadlocks, because orphan cleanup needs to lock the superblock
1847 * in numerous places. Here we just pop the lock - it's relatively
1848 * harmless, because we are now ready to accept write_super() requests,
1849 * and aviro says that's the only reason for hanging onto the
1850 * superblock lock.
1851 */
1852 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
1853 ext4_orphan_cleanup(sb, es);
1854 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
1855 if (needs_recovery)
1856 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
1857 ext4_mark_recovery_complete(sb, es);
1858 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
1859 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
1860 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
1861 "writeback");
1862
1863 ext4_ext_init(sb);
1864
1865 lock_kernel();
1866 return 0;
1867
1868cantfind_ext4:
1869 if (!silent)
1870 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
1871 sb->s_id);
1872 goto failed_mount;
1873
1874failed_mount4:
1875 jbd2_journal_destroy(sbi->s_journal);
1876failed_mount3:
1877 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1878 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1879 percpu_counter_destroy(&sbi->s_dirs_counter);
1880failed_mount2:
1881 for (i = 0; i < db_count; i++)
1882 brelse(sbi->s_group_desc[i]);
1883 kfree(sbi->s_group_desc);
1884failed_mount:
1885#ifdef CONFIG_QUOTA
1886 for (i = 0; i < MAXQUOTAS; i++)
1887 kfree(sbi->s_qf_names[i]);
1888#endif
1889 ext4_blkdev_remove(sbi);
1890 brelse(bh);
1891out_fail:
1892 sb->s_fs_info = NULL;
1893 kfree(sbi);
1894 lock_kernel();
1895 return -EINVAL;
1896}
1897
1898/*
1899 * Setup any per-fs journal parameters now. We'll do this both on
1900 * initial mount, once the journal has been initialised but before we've
1901 * done any recovery; and again on any subsequent remount.
1902 */
1903static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
1904{
1905 struct ext4_sb_info *sbi = EXT4_SB(sb);
1906
1907 if (sbi->s_commit_interval)
1908 journal->j_commit_interval = sbi->s_commit_interval;
1909 /* We could also set up an ext4-specific default for the commit
1910 * interval here, but for now we'll just fall back to the jbd
1911 * default. */
1912
1913 spin_lock(&journal->j_state_lock);
1914 if (test_opt(sb, BARRIER))
1915 journal->j_flags |= JBD2_BARRIER;
1916 else
1917 journal->j_flags &= ~JBD2_BARRIER;
1918 spin_unlock(&journal->j_state_lock);
1919}
1920
1921static journal_t *ext4_get_journal(struct super_block *sb,
1922 unsigned int journal_inum)
1923{
1924 struct inode *journal_inode;
1925 journal_t *journal;
1926
1927 /* First, test for the existence of a valid inode on disk. Bad
1928 * things happen if we iget() an unused inode, as the subsequent
1929 * iput() will try to delete it. */
1930
1931 journal_inode = iget(sb, journal_inum);
1932 if (!journal_inode) {
1933 printk(KERN_ERR "EXT4-fs: no journal found.\n");
1934 return NULL;
1935 }
1936 if (!journal_inode->i_nlink) {
1937 make_bad_inode(journal_inode);
1938 iput(journal_inode);
1939 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
1940 return NULL;
1941 }
1942
1943 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1944 journal_inode, journal_inode->i_size);
1945 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1946 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
1947 iput(journal_inode);
1948 return NULL;
1949 }
1950
1951 journal = jbd2_journal_init_inode(journal_inode);
1952 if (!journal) {
1953 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
1954 iput(journal_inode);
1955 return NULL;
1956 }
1957 journal->j_private = sb;
1958 ext4_init_journal_params(sb, journal);
1959 return journal;
1960}
1961
1962static journal_t *ext4_get_dev_journal(struct super_block *sb,
1963 dev_t j_dev)
1964{
1965 struct buffer_head * bh;
1966 journal_t *journal;
1967 ext4_fsblk_t start;
1968 ext4_fsblk_t len;
1969 int hblock, blocksize;
1970 ext4_fsblk_t sb_block;
1971 unsigned long offset;
1972 struct ext4_super_block * es;
1973 struct block_device *bdev;
1974
1975 bdev = ext4_blkdev_get(j_dev);
1976 if (bdev == NULL)
1977 return NULL;
1978
1979 if (bd_claim(bdev, sb)) {
1980 printk(KERN_ERR
1981 "EXT4: failed to claim external journal device.\n");
1982 blkdev_put(bdev);
1983 return NULL;
1984 }
1985
1986 blocksize = sb->s_blocksize;
1987 hblock = bdev_hardsect_size(bdev);
1988 if (blocksize < hblock) {
1989 printk(KERN_ERR
1990 "EXT4-fs: blocksize too small for journal device.\n");
1991 goto out_bdev;
1992 }
1993
1994 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
1995 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
1996 set_blocksize(bdev, blocksize);
1997 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1998 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
1999 "external journal\n");
2000 goto out_bdev;
2001 }
2002
2003 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2004 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2005 !(le32_to_cpu(es->s_feature_incompat) &
2006 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2007 printk(KERN_ERR "EXT4-fs: external journal has "
2008 "bad superblock\n");
2009 brelse(bh);
2010 goto out_bdev;
2011 }
2012
2013 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2014 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2015 brelse(bh);
2016 goto out_bdev;
2017 }
2018
2019 len = ext4_blocks_count(es);
2020 start = sb_block + 1;
2021 brelse(bh); /* we're done with the superblock */
2022
2023 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2024 start, len, blocksize);
2025 if (!journal) {
2026 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2027 goto out_bdev;
2028 }
2029 journal->j_private = sb;
2030 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2031 wait_on_buffer(journal->j_sb_buffer);
2032 if (!buffer_uptodate(journal->j_sb_buffer)) {
2033 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2034 goto out_journal;
2035 }
2036 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2037 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2038 "user (unsupported) - %d\n",
2039 be32_to_cpu(journal->j_superblock->s_nr_users));
2040 goto out_journal;
2041 }
2042 EXT4_SB(sb)->journal_bdev = bdev;
2043 ext4_init_journal_params(sb, journal);
2044 return journal;
2045out_journal:
2046 jbd2_journal_destroy(journal);
2047out_bdev:
2048 ext4_blkdev_put(bdev);
2049 return NULL;
2050}
2051
2052static int ext4_load_journal(struct super_block *sb,
2053 struct ext4_super_block *es,
2054 unsigned long journal_devnum)
2055{
2056 journal_t *journal;
2057 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2058 dev_t journal_dev;
2059 int err = 0;
2060 int really_read_only;
2061
2062 if (journal_devnum &&
2063 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2064 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2065 "numbers have changed\n");
2066 journal_dev = new_decode_dev(journal_devnum);
2067 } else
2068 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2069
2070 really_read_only = bdev_read_only(sb->s_bdev);
2071
2072 /*
2073 * Are we loading a blank journal or performing recovery after a
2074 * crash? For recovery, we need to check in advance whether we
2075 * can get read-write access to the device.
2076 */
2077
2078 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2079 if (sb->s_flags & MS_RDONLY) {
2080 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2081 "required on readonly filesystem.\n");
2082 if (really_read_only) {
2083 printk(KERN_ERR "EXT4-fs: write access "
2084 "unavailable, cannot proceed.\n");
2085 return -EROFS;
2086 }
2087 printk (KERN_INFO "EXT4-fs: write access will "
2088 "be enabled during recovery.\n");
2089 }
2090 }
2091
2092 if (journal_inum && journal_dev) {
2093 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2094 "and inode journals!\n");
2095 return -EINVAL;
2096 }
2097
2098 if (journal_inum) {
2099 if (!(journal = ext4_get_journal(sb, journal_inum)))
2100 return -EINVAL;
2101 } else {
2102 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2103 return -EINVAL;
2104 }
2105
2106 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2107 err = jbd2_journal_update_format(journal);
2108 if (err) {
2109 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2110 jbd2_journal_destroy(journal);
2111 return err;
2112 }
2113 }
2114
2115 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2116 err = jbd2_journal_wipe(journal, !really_read_only);
2117 if (!err)
2118 err = jbd2_journal_load(journal);
2119
2120 if (err) {
2121 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2122 jbd2_journal_destroy(journal);
2123 return err;
2124 }
2125
2126 EXT4_SB(sb)->s_journal = journal;
2127 ext4_clear_journal_err(sb, es);
2128
2129 if (journal_devnum &&
2130 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2131 es->s_journal_dev = cpu_to_le32(journal_devnum);
2132 sb->s_dirt = 1;
2133
2134 /* Make sure we flush the recovery flag to disk. */
2135 ext4_commit_super(sb, es, 1);
2136 }
2137
2138 return 0;
2139}
2140
2141static int ext4_create_journal(struct super_block * sb,
2142 struct ext4_super_block * es,
2143 unsigned int journal_inum)
2144{
2145 journal_t *journal;
2146
2147 if (sb->s_flags & MS_RDONLY) {
2148 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2149 "create journal.\n");
2150 return -EROFS;
2151 }
2152
2153 if (!(journal = ext4_get_journal(sb, journal_inum)))
2154 return -EINVAL;
2155
2156 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2157 journal_inum);
2158
2159 if (jbd2_journal_create(journal)) {
2160 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2161 jbd2_journal_destroy(journal);
2162 return -EIO;
2163 }
2164
2165 EXT4_SB(sb)->s_journal = journal;
2166
2167 ext4_update_dynamic_rev(sb);
2168 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2169 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2170
2171 es->s_journal_inum = cpu_to_le32(journal_inum);
2172 sb->s_dirt = 1;
2173
2174 /* Make sure we flush the recovery flag to disk. */
2175 ext4_commit_super(sb, es, 1);
2176
2177 return 0;
2178}
2179
2180static void ext4_commit_super (struct super_block * sb,
2181 struct ext4_super_block * es,
2182 int sync)
2183{
2184 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2185
2186 if (!sbh)
2187 return;
2188 es->s_wtime = cpu_to_le32(get_seconds());
2189 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2190 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2191 BUFFER_TRACE(sbh, "marking dirty");
2192 mark_buffer_dirty(sbh);
2193 if (sync)
2194 sync_dirty_buffer(sbh);
2195}
2196
2197
2198/*
2199 * Have we just finished recovery? If so, and if we are mounting (or
2200 * remounting) the filesystem readonly, then we will end up with a
2201 * consistent fs on disk. Record that fact.
2202 */
2203static void ext4_mark_recovery_complete(struct super_block * sb,
2204 struct ext4_super_block * es)
2205{
2206 journal_t *journal = EXT4_SB(sb)->s_journal;
2207
2208 jbd2_journal_lock_updates(journal);
2209 jbd2_journal_flush(journal);
2210 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2211 sb->s_flags & MS_RDONLY) {
2212 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2213 sb->s_dirt = 0;
2214 ext4_commit_super(sb, es, 1);
2215 }
2216 jbd2_journal_unlock_updates(journal);
2217}
2218
2219/*
2220 * If we are mounting (or read-write remounting) a filesystem whose journal
2221 * has recorded an error from a previous lifetime, move that error to the
2222 * main filesystem now.
2223 */
2224static void ext4_clear_journal_err(struct super_block * sb,
2225 struct ext4_super_block * es)
2226{
2227 journal_t *journal;
2228 int j_errno;
2229 const char *errstr;
2230
2231 journal = EXT4_SB(sb)->s_journal;
2232
2233 /*
2234 * Now check for any error status which may have been recorded in the
2235 * journal by a prior ext4_error() or ext4_abort()
2236 */
2237
2238 j_errno = jbd2_journal_errno(journal);
2239 if (j_errno) {
2240 char nbuf[16];
2241
2242 errstr = ext4_decode_error(sb, j_errno, nbuf);
2243 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2244 "from previous mount: %s", errstr);
2245 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2246 "filesystem check.");
2247
2248 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2249 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2250 ext4_commit_super (sb, es, 1);
2251
2252 jbd2_journal_clear_err(journal);
2253 }
2254}
2255
2256/*
2257 * Force the running and committing transactions to commit,
2258 * and wait on the commit.
2259 */
2260int ext4_force_commit(struct super_block *sb)
2261{
2262 journal_t *journal;
2263 int ret;
2264
2265 if (sb->s_flags & MS_RDONLY)
2266 return 0;
2267
2268 journal = EXT4_SB(sb)->s_journal;
2269 sb->s_dirt = 0;
2270 ret = ext4_journal_force_commit(journal);
2271 return ret;
2272}
2273
2274/*
2275 * Ext4 always journals updates to the superblock itself, so we don't
2276 * have to propagate any other updates to the superblock on disk at this
2277 * point. Just start an async writeback to get the buffers on their way
2278 * to the disk.
2279 *
2280 * This implicitly triggers the writebehind on sync().
2281 */
2282
2283static void ext4_write_super (struct super_block * sb)
2284{
2285 if (mutex_trylock(&sb->s_lock) != 0)
2286 BUG();
2287 sb->s_dirt = 0;
2288}
2289
2290static int ext4_sync_fs(struct super_block *sb, int wait)
2291{
2292 tid_t target;
2293
2294 sb->s_dirt = 0;
2295 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2296 if (wait)
2297 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2298 }
2299 return 0;
2300}
2301
2302/*
2303 * LVM calls this function before a (read-only) snapshot is created. This
2304 * gives us a chance to flush the journal completely and mark the fs clean.
2305 */
2306static void ext4_write_super_lockfs(struct super_block *sb)
2307{
2308 sb->s_dirt = 0;
2309
2310 if (!(sb->s_flags & MS_RDONLY)) {
2311 journal_t *journal = EXT4_SB(sb)->s_journal;
2312
2313 /* Now we set up the journal barrier. */
2314 jbd2_journal_lock_updates(journal);
2315 jbd2_journal_flush(journal);
2316
2317 /* Journal blocked and flushed, clear needs_recovery flag. */
2318 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2319 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2320 }
2321}
2322
2323/*
2324 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2325 * flag here, even though the filesystem is not technically dirty yet.
2326 */
2327static void ext4_unlockfs(struct super_block *sb)
2328{
2329 if (!(sb->s_flags & MS_RDONLY)) {
2330 lock_super(sb);
2331 /* Reser the needs_recovery flag before the fs is unlocked. */
2332 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2333 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2334 unlock_super(sb);
2335 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2336 }
2337}
2338
2339static int ext4_remount (struct super_block * sb, int * flags, char * data)
2340{
2341 struct ext4_super_block * es;
2342 struct ext4_sb_info *sbi = EXT4_SB(sb);
2343 ext4_fsblk_t n_blocks_count = 0;
2344 unsigned long old_sb_flags;
2345 struct ext4_mount_options old_opts;
2346 int err;
2347#ifdef CONFIG_QUOTA
2348 int i;
2349#endif
2350
2351 /* Store the original options */
2352 old_sb_flags = sb->s_flags;
2353 old_opts.s_mount_opt = sbi->s_mount_opt;
2354 old_opts.s_resuid = sbi->s_resuid;
2355 old_opts.s_resgid = sbi->s_resgid;
2356 old_opts.s_commit_interval = sbi->s_commit_interval;
2357#ifdef CONFIG_QUOTA
2358 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2359 for (i = 0; i < MAXQUOTAS; i++)
2360 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2361#endif
2362
2363 /*
2364 * Allow the "check" option to be passed as a remount option.
2365 */
2366 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2367 err = -EINVAL;
2368 goto restore_opts;
2369 }
2370
2371 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2372 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2373
2374 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2375 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2376
2377 es = sbi->s_es;
2378
2379 ext4_init_journal_params(sb, sbi->s_journal);
2380
2381 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2382 n_blocks_count > ext4_blocks_count(es)) {
2383 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2384 err = -EROFS;
2385 goto restore_opts;
2386 }
2387
2388 if (*flags & MS_RDONLY) {
2389 /*
2390 * First of all, the unconditional stuff we have to do
2391 * to disable replay of the journal when we next remount
2392 */
2393 sb->s_flags |= MS_RDONLY;
2394
2395 /*
2396 * OK, test if we are remounting a valid rw partition
2397 * readonly, and if so set the rdonly flag and then
2398 * mark the partition as valid again.
2399 */
2400 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2401 (sbi->s_mount_state & EXT4_VALID_FS))
2402 es->s_state = cpu_to_le16(sbi->s_mount_state);
2403
2404 ext4_mark_recovery_complete(sb, es);
2405 } else {
2406 __le32 ret;
2407 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2408 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2409 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2410 "remount RDWR because of unsupported "
2411 "optional features (%x).\n",
2412 sb->s_id, le32_to_cpu(ret));
2413 err = -EROFS;
2414 goto restore_opts;
2415 }
2416 /*
2417 * Mounting a RDONLY partition read-write, so reread
2418 * and store the current valid flag. (It may have
2419 * been changed by e2fsck since we originally mounted
2420 * the partition.)
2421 */
2422 ext4_clear_journal_err(sb, es);
2423 sbi->s_mount_state = le16_to_cpu(es->s_state);
2424 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2425 goto restore_opts;
2426 if (!ext4_setup_super (sb, es, 0))
2427 sb->s_flags &= ~MS_RDONLY;
2428 }
2429 }
2430#ifdef CONFIG_QUOTA
2431 /* Release old quota file names */
2432 for (i = 0; i < MAXQUOTAS; i++)
2433 if (old_opts.s_qf_names[i] &&
2434 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2435 kfree(old_opts.s_qf_names[i]);
2436#endif
2437 return 0;
2438restore_opts:
2439 sb->s_flags = old_sb_flags;
2440 sbi->s_mount_opt = old_opts.s_mount_opt;
2441 sbi->s_resuid = old_opts.s_resuid;
2442 sbi->s_resgid = old_opts.s_resgid;
2443 sbi->s_commit_interval = old_opts.s_commit_interval;
2444#ifdef CONFIG_QUOTA
2445 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2446 for (i = 0; i < MAXQUOTAS; i++) {
2447 if (sbi->s_qf_names[i] &&
2448 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2449 kfree(sbi->s_qf_names[i]);
2450 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2451 }
2452#endif
2453 return err;
2454}
2455
2456static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2457{
2458 struct super_block *sb = dentry->d_sb;
2459 struct ext4_sb_info *sbi = EXT4_SB(sb);
2460 struct ext4_super_block *es = sbi->s_es;
2461 ext4_fsblk_t overhead;
2462 int i;
2463
2464 if (test_opt (sb, MINIX_DF))
2465 overhead = 0;
2466 else {
2467 unsigned long ngroups;
2468 ngroups = EXT4_SB(sb)->s_groups_count;
2469 smp_rmb();
2470
2471 /*
2472 * Compute the overhead (FS structures)
2473 */
2474
2475 /*
2476 * All of the blocks before first_data_block are
2477 * overhead
2478 */
2479 overhead = le32_to_cpu(es->s_first_data_block);
2480
2481 /*
2482 * Add the overhead attributed to the superblock and
2483 * block group descriptors. If the sparse superblocks
2484 * feature is turned on, then not all groups have this.
2485 */
2486 for (i = 0; i < ngroups; i++) {
2487 overhead += ext4_bg_has_super(sb, i) +
2488 ext4_bg_num_gdb(sb, i);
2489 cond_resched();
2490 }
2491
2492 /*
2493 * Every block group has an inode bitmap, a block
2494 * bitmap, and an inode table.
2495 */
2496 overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group));
2497 }
2498
2499 buf->f_type = EXT4_SUPER_MAGIC;
2500 buf->f_bsize = sb->s_blocksize;
2501 buf->f_blocks = ext4_blocks_count(es) - overhead;
2502 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2503 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2504 if (buf->f_bfree < ext4_r_blocks_count(es))
2505 buf->f_bavail = 0;
2506 buf->f_files = le32_to_cpu(es->s_inodes_count);
2507 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2508 buf->f_namelen = EXT4_NAME_LEN;
2509 return 0;
2510}
2511
2512/* Helper function for writing quotas on sync - we need to start transaction before quota file
2513 * is locked for write. Otherwise the are possible deadlocks:
2514 * Process 1 Process 2
2515 * ext4_create() quota_sync()
2516 * jbd2_journal_start() write_dquot()
2517 * DQUOT_INIT() down(dqio_mutex)
2518 * down(dqio_mutex) jbd2_journal_start()
2519 *
2520 */
2521
2522#ifdef CONFIG_QUOTA
2523
2524static inline struct inode *dquot_to_inode(struct dquot *dquot)
2525{
2526 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2527}
2528
2529static int ext4_dquot_initialize(struct inode *inode, int type)
2530{
2531 handle_t *handle;
2532 int ret, err;
2533
2534 /* We may create quota structure so we need to reserve enough blocks */
2535 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2536 if (IS_ERR(handle))
2537 return PTR_ERR(handle);
2538 ret = dquot_initialize(inode, type);
2539 err = ext4_journal_stop(handle);
2540 if (!ret)
2541 ret = err;
2542 return ret;
2543}
2544
2545static int ext4_dquot_drop(struct inode *inode)
2546{
2547 handle_t *handle;
2548 int ret, err;
2549
2550 /* We may delete quota structure so we need to reserve enough blocks */
2551 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2552 if (IS_ERR(handle))
2553 return PTR_ERR(handle);
2554 ret = dquot_drop(inode);
2555 err = ext4_journal_stop(handle);
2556 if (!ret)
2557 ret = err;
2558 return ret;
2559}
2560
2561static int ext4_write_dquot(struct dquot *dquot)
2562{
2563 int ret, err;
2564 handle_t *handle;
2565 struct inode *inode;
2566
2567 inode = dquot_to_inode(dquot);
2568 handle = ext4_journal_start(inode,
2569 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2570 if (IS_ERR(handle))
2571 return PTR_ERR(handle);
2572 ret = dquot_commit(dquot);
2573 err = ext4_journal_stop(handle);
2574 if (!ret)
2575 ret = err;
2576 return ret;
2577}
2578
2579static int ext4_acquire_dquot(struct dquot *dquot)
2580{
2581 int ret, err;
2582 handle_t *handle;
2583
2584 handle = ext4_journal_start(dquot_to_inode(dquot),
2585 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2586 if (IS_ERR(handle))
2587 return PTR_ERR(handle);
2588 ret = dquot_acquire(dquot);
2589 err = ext4_journal_stop(handle);
2590 if (!ret)
2591 ret = err;
2592 return ret;
2593}
2594
2595static int ext4_release_dquot(struct dquot *dquot)
2596{
2597 int ret, err;
2598 handle_t *handle;
2599
2600 handle = ext4_journal_start(dquot_to_inode(dquot),
2601 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2602 if (IS_ERR(handle))
2603 return PTR_ERR(handle);
2604 ret = dquot_release(dquot);
2605 err = ext4_journal_stop(handle);
2606 if (!ret)
2607 ret = err;
2608 return ret;
2609}
2610
2611static int ext4_mark_dquot_dirty(struct dquot *dquot)
2612{
2613 /* Are we journalling quotas? */
2614 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2615 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2616 dquot_mark_dquot_dirty(dquot);
2617 return ext4_write_dquot(dquot);
2618 } else {
2619 return dquot_mark_dquot_dirty(dquot);
2620 }
2621}
2622
2623static int ext4_write_info(struct super_block *sb, int type)
2624{
2625 int ret, err;
2626 handle_t *handle;
2627
2628 /* Data block + inode block */
2629 handle = ext4_journal_start(sb->s_root->d_inode, 2);
2630 if (IS_ERR(handle))
2631 return PTR_ERR(handle);
2632 ret = dquot_commit_info(sb, type);
2633 err = ext4_journal_stop(handle);
2634 if (!ret)
2635 ret = err;
2636 return ret;
2637}
2638
2639/*
2640 * Turn on quotas during mount time - we need to find
2641 * the quota file and such...
2642 */
2643static int ext4_quota_on_mount(struct super_block *sb, int type)
2644{
2645 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2646 EXT4_SB(sb)->s_jquota_fmt, type);
2647}
2648
2649/*
2650 * Standard function to be called on quota_on
2651 */
2652static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2653 char *path)
2654{
2655 int err;
2656 struct nameidata nd;
2657
2658 if (!test_opt(sb, QUOTA))
2659 return -EINVAL;
2660 /* Not journalling quota? */
2661 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2662 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2663 return vfs_quota_on(sb, type, format_id, path);
2664 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2665 if (err)
2666 return err;
2667 /* Quotafile not on the same filesystem? */
2668 if (nd.mnt->mnt_sb != sb) {
2669 path_release(&nd);
2670 return -EXDEV;
2671 }
2672 /* Quotafile not of fs root? */
2673 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2674 printk(KERN_WARNING
2675 "EXT4-fs: Quota file not on filesystem root. "
2676 "Journalled quota will not work.\n");
2677 path_release(&nd);
2678 return vfs_quota_on(sb, type, format_id, path);
2679}
2680
2681/* Read data from quotafile - avoid pagecache and such because we cannot afford
2682 * acquiring the locks... As quota files are never truncated and quota code
2683 * itself serializes the operations (and noone else should touch the files)
2684 * we don't have to be afraid of races */
2685static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2686 size_t len, loff_t off)
2687{
2688 struct inode *inode = sb_dqopt(sb)->files[type];
2689 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2690 int err = 0;
2691 int offset = off & (sb->s_blocksize - 1);
2692 int tocopy;
2693 size_t toread;
2694 struct buffer_head *bh;
2695 loff_t i_size = i_size_read(inode);
2696
2697 if (off > i_size)
2698 return 0;
2699 if (off+len > i_size)
2700 len = i_size-off;
2701 toread = len;
2702 while (toread > 0) {
2703 tocopy = sb->s_blocksize - offset < toread ?
2704 sb->s_blocksize - offset : toread;
2705 bh = ext4_bread(NULL, inode, blk, 0, &err);
2706 if (err)
2707 return err;
2708 if (!bh) /* A hole? */
2709 memset(data, 0, tocopy);
2710 else
2711 memcpy(data, bh->b_data+offset, tocopy);
2712 brelse(bh);
2713 offset = 0;
2714 toread -= tocopy;
2715 data += tocopy;
2716 blk++;
2717 }
2718 return len;
2719}
2720
2721/* Write to quotafile (we know the transaction is already started and has
2722 * enough credits) */
2723static ssize_t ext4_quota_write(struct super_block *sb, int type,
2724 const char *data, size_t len, loff_t off)
2725{
2726 struct inode *inode = sb_dqopt(sb)->files[type];
2727 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2728 int err = 0;
2729 int offset = off & (sb->s_blocksize - 1);
2730 int tocopy;
2731 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2732 size_t towrite = len;
2733 struct buffer_head *bh;
2734 handle_t *handle = journal_current_handle();
2735
2736 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2737 while (towrite > 0) {
2738 tocopy = sb->s_blocksize - offset < towrite ?
2739 sb->s_blocksize - offset : towrite;
2740 bh = ext4_bread(handle, inode, blk, 1, &err);
2741 if (!bh)
2742 goto out;
2743 if (journal_quota) {
2744 err = ext4_journal_get_write_access(handle, bh);
2745 if (err) {
2746 brelse(bh);
2747 goto out;
2748 }
2749 }
2750 lock_buffer(bh);
2751 memcpy(bh->b_data+offset, data, tocopy);
2752 flush_dcache_page(bh->b_page);
2753 unlock_buffer(bh);
2754 if (journal_quota)
2755 err = ext4_journal_dirty_metadata(handle, bh);
2756 else {
2757 /* Always do at least ordered writes for quotas */
2758 err = ext4_journal_dirty_data(handle, bh);
2759 mark_buffer_dirty(bh);
2760 }
2761 brelse(bh);
2762 if (err)
2763 goto out;
2764 offset = 0;
2765 towrite -= tocopy;
2766 data += tocopy;
2767 blk++;
2768 }
2769out:
2770 if (len == towrite)
2771 return err;
2772 if (inode->i_size < off+len-towrite) {
2773 i_size_write(inode, off+len-towrite);
2774 EXT4_I(inode)->i_disksize = inode->i_size;
2775 }
2776 inode->i_version++;
2777 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2778 ext4_mark_inode_dirty(handle, inode);
2779 mutex_unlock(&inode->i_mutex);
2780 return len - towrite;
2781}
2782
2783#endif
2784
2785static int ext4_get_sb(struct file_system_type *fs_type,
2786 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2787{
2788 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
2789}
2790
2791static struct file_system_type ext4dev_fs_type = {
2792 .owner = THIS_MODULE,
2793 .name = "ext4dev",
2794 .get_sb = ext4_get_sb,
2795 .kill_sb = kill_block_super,
2796 .fs_flags = FS_REQUIRES_DEV,
2797};
2798
2799static int __init init_ext4_fs(void)
2800{
2801 int err = init_ext4_xattr();
2802 if (err)
2803 return err;
2804 err = init_inodecache();
2805 if (err)
2806 goto out1;
2807 err = register_filesystem(&ext4dev_fs_type);
2808 if (err)
2809 goto out;
2810 return 0;
2811out:
2812 destroy_inodecache();
2813out1:
2814 exit_ext4_xattr();
2815 return err;
2816}
2817
2818static void __exit exit_ext4_fs(void)
2819{
2820 unregister_filesystem(&ext4dev_fs_type);
2821 destroy_inodecache();
2822 exit_ext4_xattr();
2823}
2824
2825MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2826MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
2827MODULE_LICENSE("GPL");
2828module_init(init_ext4_fs)
2829module_exit(exit_ext4_fs)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-13 18:43:29 -0500