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-rw-r--r--fs/ext4/super.c2754
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diff --git a/fs/ext4/super.c b/fs/ext4/super.c
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1/*
2 * linux/fs/ext3/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/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.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 ext3_load_journal(struct super_block *, struct ext3_super_block *,
46 unsigned long journal_devnum);
47static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
48 unsigned int);
49static void ext3_commit_super (struct super_block * sb,
50 struct ext3_super_block * es,
51 int sync);
52static void ext3_mark_recovery_complete(struct super_block * sb,
53 struct ext3_super_block * es);
54static void ext3_clear_journal_err(struct super_block * sb,
55 struct ext3_super_block * es);
56static int ext3_sync_fs(struct super_block *sb, int wait);
57static const char *ext3_decode_error(struct super_block * sb, int errno,
58 char nbuf[16]);
59static int ext3_remount (struct super_block * sb, int * flags, char * data);
60static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
61static void ext3_unlockfs(struct super_block *sb);
62static void ext3_write_super (struct super_block * sb);
63static void ext3_write_super_lockfs(struct super_block *sb);
64
65/*
66 * Wrappers for journal_start/end.
67 *
68 * The only special thing we need to do here is to make sure that all
69 * journal_end calls result in the superblock being marked dirty, so
70 * that sync() will call the filesystem's write_super callback if
71 * appropriate.
72 */
73handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74{
75 journal_t *journal;
76
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
79
80 /* Special case here: if the journal has aborted behind our
81 * backs (eg. EIO in the commit thread), then we still need to
82 * take the FS itself readonly cleanly. */
83 journal = EXT3_SB(sb)->s_journal;
84 if (is_journal_aborted(journal)) {
85 ext3_abort(sb, __FUNCTION__,
86 "Detected aborted journal");
87 return ERR_PTR(-EROFS);
88 }
89
90 return journal_start(journal, nblocks);
91}
92
93/*
94 * The only special thing we need to do here is to make sure that all
95 * journal_stop calls result in the superblock being marked dirty, so
96 * that sync() will call the filesystem's write_super callback if
97 * appropriate.
98 */
99int __ext3_journal_stop(const char *where, handle_t *handle)
100{
101 struct super_block *sb;
102 int err;
103 int rc;
104
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
108
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114}
115
116void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117 struct buffer_head *bh, handle_t *handle, int err)
118{
119 char nbuf[16];
120 const char *errstr = ext3_decode_error(NULL, err, nbuf);
121
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
124
125 if (!handle->h_err)
126 handle->h_err = err;
127
128 if (is_handle_aborted(handle))
129 return;
130
131 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
133
134 journal_abort_handle(handle);
135}
136
137/* Deal with the reporting of failure conditions on a filesystem such as
138 * inconsistencies detected or read IO failures.
139 *
140 * On ext2, we can store the error state of the filesystem in the
141 * superblock. That is not possible on ext3, because we may have other
142 * write ordering constraints on the superblock which prevent us from
143 * writing it out straight away; and given that the journal is about to
144 * be aborted, we can't rely on the current, or future, transactions to
145 * write out the superblock safely.
146 *
147 * We'll just use the journal_abort() error code to record an error in
148 * the journal instead. On recovery, the journal will compain about
149 * that error until we've noted it down and cleared it.
150 */
151
152static void ext3_handle_error(struct super_block *sb)
153{
154 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
155
156 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
157 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
158
159 if (sb->s_flags & MS_RDONLY)
160 return;
161
162 if (!test_opt (sb, ERRORS_CONT)) {
163 journal_t *journal = EXT3_SB(sb)->s_journal;
164
165 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
166 if (journal)
167 journal_abort(journal, -EIO);
168 }
169 if (test_opt (sb, ERRORS_RO)) {
170 printk (KERN_CRIT "Remounting filesystem read-only\n");
171 sb->s_flags |= MS_RDONLY;
172 }
173 ext3_commit_super(sb, es, 1);
174 if (test_opt(sb, ERRORS_PANIC))
175 panic("EXT3-fs (device %s): panic forced after error\n",
176 sb->s_id);
177}
178
179void ext3_error (struct super_block * sb, const char * function,
180 const char * fmt, ...)
181{
182 va_list args;
183
184 va_start(args, fmt);
185 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
186 vprintk(fmt, args);
187 printk("\n");
188 va_end(args);
189
190 ext3_handle_error(sb);
191}
192
193static const char *ext3_decode_error(struct super_block * sb, int errno,
194 char nbuf[16])
195{
196 char *errstr = NULL;
197
198 switch (errno) {
199 case -EIO:
200 errstr = "IO failure";
201 break;
202 case -ENOMEM:
203 errstr = "Out of memory";
204 break;
205 case -EROFS:
206 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
207 errstr = "Journal has aborted";
208 else
209 errstr = "Readonly filesystem";
210 break;
211 default:
212 /* If the caller passed in an extra buffer for unknown
213 * errors, textualise them now. Else we just return
214 * NULL. */
215 if (nbuf) {
216 /* Check for truncated error codes... */
217 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
218 errstr = nbuf;
219 }
220 break;
221 }
222
223 return errstr;
224}
225
226/* __ext3_std_error decodes expected errors from journaling functions
227 * automatically and invokes the appropriate error response. */
228
229void __ext3_std_error (struct super_block * sb, const char * function,
230 int errno)
231{
232 char nbuf[16];
233 const char *errstr;
234
235 /* Special case: if the error is EROFS, and we're not already
236 * inside a transaction, then there's really no point in logging
237 * an error. */
238 if (errno == -EROFS && journal_current_handle() == NULL &&
239 (sb->s_flags & MS_RDONLY))
240 return;
241
242 errstr = ext3_decode_error(sb, errno, nbuf);
243 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
244 sb->s_id, function, errstr);
245
246 ext3_handle_error(sb);
247}
248
249/*
250 * ext3_abort is a much stronger failure handler than ext3_error. The
251 * abort function may be used to deal with unrecoverable failures such
252 * as journal IO errors or ENOMEM at a critical moment in log management.
253 *
254 * We unconditionally force the filesystem into an ABORT|READONLY state,
255 * unless the error response on the fs has been set to panic in which
256 * case we take the easy way out and panic immediately.
257 */
258
259void ext3_abort (struct super_block * sb, const char * function,
260 const char * fmt, ...)
261{
262 va_list args;
263
264 printk (KERN_CRIT "ext3_abort called.\n");
265
266 va_start(args, fmt);
267 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
268 vprintk(fmt, args);
269 printk("\n");
270 va_end(args);
271
272 if (test_opt(sb, ERRORS_PANIC))
273 panic("EXT3-fs panic from previous error\n");
274
275 if (sb->s_flags & MS_RDONLY)
276 return;
277
278 printk(KERN_CRIT "Remounting filesystem read-only\n");
279 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
280 sb->s_flags |= MS_RDONLY;
281 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
282 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
283}
284
285void ext3_warning (struct super_block * sb, const char * function,
286 const char * fmt, ...)
287{
288 va_list args;
289
290 va_start(args, fmt);
291 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
292 sb->s_id, function);
293 vprintk(fmt, args);
294 printk("\n");
295 va_end(args);
296}
297
298void ext3_update_dynamic_rev(struct super_block *sb)
299{
300 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
301
302 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
303 return;
304
305 ext3_warning(sb, __FUNCTION__,
306 "updating to rev %d because of new feature flag, "
307 "running e2fsck is recommended",
308 EXT3_DYNAMIC_REV);
309
310 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
311 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
312 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
313 /* leave es->s_feature_*compat flags alone */
314 /* es->s_uuid will be set by e2fsck if empty */
315
316 /*
317 * The rest of the superblock fields should be zero, and if not it
318 * means they are likely already in use, so leave them alone. We
319 * can leave it up to e2fsck to clean up any inconsistencies there.
320 */
321}
322
323/*
324 * Open the external journal device
325 */
326static struct block_device *ext3_blkdev_get(dev_t dev)
327{
328 struct block_device *bdev;
329 char b[BDEVNAME_SIZE];
330
331 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
332 if (IS_ERR(bdev))
333 goto fail;
334 return bdev;
335
336fail:
337 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
338 __bdevname(dev, b), PTR_ERR(bdev));
339 return NULL;
340}
341
342/*
343 * Release the journal device
344 */
345static int ext3_blkdev_put(struct block_device *bdev)
346{
347 bd_release(bdev);
348 return blkdev_put(bdev);
349}
350
351static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
352{
353 struct block_device *bdev;
354 int ret = -ENODEV;
355
356 bdev = sbi->journal_bdev;
357 if (bdev) {
358 ret = ext3_blkdev_put(bdev);
359 sbi->journal_bdev = NULL;
360 }
361 return ret;
362}
363
364static inline struct inode *orphan_list_entry(struct list_head *l)
365{
366 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
367}
368
369static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
370{
371 struct list_head *l;
372
373 printk(KERN_ERR "sb orphan head is %d\n",
374 le32_to_cpu(sbi->s_es->s_last_orphan));
375
376 printk(KERN_ERR "sb_info orphan list:\n");
377 list_for_each(l, &sbi->s_orphan) {
378 struct inode *inode = orphan_list_entry(l);
379 printk(KERN_ERR " "
380 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
381 inode->i_sb->s_id, inode->i_ino, inode,
382 inode->i_mode, inode->i_nlink,
383 NEXT_ORPHAN(inode));
384 }
385}
386
387static void ext3_put_super (struct super_block * sb)
388{
389 struct ext3_sb_info *sbi = EXT3_SB(sb);
390 struct ext3_super_block *es = sbi->s_es;
391 int i;
392
393 ext3_xattr_put_super(sb);
394 journal_destroy(sbi->s_journal);
395 if (!(sb->s_flags & MS_RDONLY)) {
396 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
397 es->s_state = cpu_to_le16(sbi->s_mount_state);
398 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
399 mark_buffer_dirty(sbi->s_sbh);
400 ext3_commit_super(sb, es, 1);
401 }
402
403 for (i = 0; i < sbi->s_gdb_count; i++)
404 brelse(sbi->s_group_desc[i]);
405 kfree(sbi->s_group_desc);
406 percpu_counter_destroy(&sbi->s_freeblocks_counter);
407 percpu_counter_destroy(&sbi->s_freeinodes_counter);
408 percpu_counter_destroy(&sbi->s_dirs_counter);
409 brelse(sbi->s_sbh);
410#ifdef CONFIG_QUOTA
411 for (i = 0; i < MAXQUOTAS; i++)
412 kfree(sbi->s_qf_names[i]);
413#endif
414
415 /* Debugging code just in case the in-memory inode orphan list
416 * isn't empty. The on-disk one can be non-empty if we've
417 * detected an error and taken the fs readonly, but the
418 * in-memory list had better be clean by this point. */
419 if (!list_empty(&sbi->s_orphan))
420 dump_orphan_list(sb, sbi);
421 J_ASSERT(list_empty(&sbi->s_orphan));
422
423 invalidate_bdev(sb->s_bdev, 0);
424 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
425 /*
426 * Invalidate the journal device's buffers. We don't want them
427 * floating about in memory - the physical journal device may
428 * hotswapped, and it breaks the `ro-after' testing code.
429 */
430 sync_blockdev(sbi->journal_bdev);
431 invalidate_bdev(sbi->journal_bdev, 0);
432 ext3_blkdev_remove(sbi);
433 }
434 sb->s_fs_info = NULL;
435 kfree(sbi);
436 return;
437}
438
439static kmem_cache_t *ext3_inode_cachep;
440
441/*
442 * Called inside transaction, so use GFP_NOFS
443 */
444static struct inode *ext3_alloc_inode(struct super_block *sb)
445{
446 struct ext3_inode_info *ei;
447
448 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
449 if (!ei)
450 return NULL;
451#ifdef CONFIG_EXT3_FS_POSIX_ACL
452 ei->i_acl = EXT3_ACL_NOT_CACHED;
453 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
454#endif
455 ei->i_block_alloc_info = NULL;
456 ei->vfs_inode.i_version = 1;
457 return &ei->vfs_inode;
458}
459
460static void ext3_destroy_inode(struct inode *inode)
461{
462 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
463}
464
465static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
466{
467 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
468
469 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
470 SLAB_CTOR_CONSTRUCTOR) {
471 INIT_LIST_HEAD(&ei->i_orphan);
472#ifdef CONFIG_EXT3_FS_XATTR
473 init_rwsem(&ei->xattr_sem);
474#endif
475 mutex_init(&ei->truncate_mutex);
476 inode_init_once(&ei->vfs_inode);
477 }
478}
479
480static int init_inodecache(void)
481{
482 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
483 sizeof(struct ext3_inode_info),
484 0, (SLAB_RECLAIM_ACCOUNT|
485 SLAB_MEM_SPREAD),
486 init_once, NULL);
487 if (ext3_inode_cachep == NULL)
488 return -ENOMEM;
489 return 0;
490}
491
492static void destroy_inodecache(void)
493{
494 kmem_cache_destroy(ext3_inode_cachep);
495}
496
497static void ext3_clear_inode(struct inode *inode)
498{
499 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
500#ifdef CONFIG_EXT3_FS_POSIX_ACL
501 if (EXT3_I(inode)->i_acl &&
502 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
503 posix_acl_release(EXT3_I(inode)->i_acl);
504 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
505 }
506 if (EXT3_I(inode)->i_default_acl &&
507 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
508 posix_acl_release(EXT3_I(inode)->i_default_acl);
509 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
510 }
511#endif
512 ext3_discard_reservation(inode);
513 EXT3_I(inode)->i_block_alloc_info = NULL;
514 if (unlikely(rsv))
515 kfree(rsv);
516}
517
518static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
519{
520#if defined(CONFIG_QUOTA)
521 struct ext3_sb_info *sbi = EXT3_SB(sb);
522
523 if (sbi->s_jquota_fmt)
524 seq_printf(seq, ",jqfmt=%s",
525 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
526
527 if (sbi->s_qf_names[USRQUOTA])
528 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
529
530 if (sbi->s_qf_names[GRPQUOTA])
531 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
532
533 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
534 seq_puts(seq, ",usrquota");
535
536 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
537 seq_puts(seq, ",grpquota");
538#endif
539}
540
541static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
542{
543 struct super_block *sb = vfs->mnt_sb;
544
545 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
546 seq_puts(seq, ",data=journal");
547 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
548 seq_puts(seq, ",data=ordered");
549 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
550 seq_puts(seq, ",data=writeback");
551
552 ext3_show_quota_options(seq, sb);
553
554 return 0;
555}
556
557
558static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
559{
560 __u32 *objp = vobjp;
561 unsigned long ino = objp[0];
562 __u32 generation = objp[1];
563 struct inode *inode;
564 struct dentry *result;
565
566 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
567 return ERR_PTR(-ESTALE);
568 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
569 return ERR_PTR(-ESTALE);
570
571 /* iget isn't really right if the inode is currently unallocated!!
572 *
573 * ext3_read_inode will return a bad_inode if the inode had been
574 * deleted, so we should be safe.
575 *
576 * Currently we don't know the generation for parent directory, so
577 * a generation of 0 means "accept any"
578 */
579 inode = iget(sb, ino);
580 if (inode == NULL)
581 return ERR_PTR(-ENOMEM);
582 if (is_bad_inode(inode) ||
583 (generation && inode->i_generation != generation)) {
584 iput(inode);
585 return ERR_PTR(-ESTALE);
586 }
587 /* now to find a dentry.
588 * If possible, get a well-connected one
589 */
590 result = d_alloc_anon(inode);
591 if (!result) {
592 iput(inode);
593 return ERR_PTR(-ENOMEM);
594 }
595 return result;
596}
597
598#ifdef CONFIG_QUOTA
599#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
600#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
601
602static int ext3_dquot_initialize(struct inode *inode, int type);
603static int ext3_dquot_drop(struct inode *inode);
604static int ext3_write_dquot(struct dquot *dquot);
605static int ext3_acquire_dquot(struct dquot *dquot);
606static int ext3_release_dquot(struct dquot *dquot);
607static int ext3_mark_dquot_dirty(struct dquot *dquot);
608static int ext3_write_info(struct super_block *sb, int type);
609static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
610static int ext3_quota_on_mount(struct super_block *sb, int type);
611static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
612 size_t len, loff_t off);
613static ssize_t ext3_quota_write(struct super_block *sb, int type,
614 const char *data, size_t len, loff_t off);
615
616static struct dquot_operations ext3_quota_operations = {
617 .initialize = ext3_dquot_initialize,
618 .drop = ext3_dquot_drop,
619 .alloc_space = dquot_alloc_space,
620 .alloc_inode = dquot_alloc_inode,
621 .free_space = dquot_free_space,
622 .free_inode = dquot_free_inode,
623 .transfer = dquot_transfer,
624 .write_dquot = ext3_write_dquot,
625 .acquire_dquot = ext3_acquire_dquot,
626 .release_dquot = ext3_release_dquot,
627 .mark_dirty = ext3_mark_dquot_dirty,
628 .write_info = ext3_write_info
629};
630
631static struct quotactl_ops ext3_qctl_operations = {
632 .quota_on = ext3_quota_on,
633 .quota_off = vfs_quota_off,
634 .quota_sync = vfs_quota_sync,
635 .get_info = vfs_get_dqinfo,
636 .set_info = vfs_set_dqinfo,
637 .get_dqblk = vfs_get_dqblk,
638 .set_dqblk = vfs_set_dqblk
639};
640#endif
641
642static struct super_operations ext3_sops = {
643 .alloc_inode = ext3_alloc_inode,
644 .destroy_inode = ext3_destroy_inode,
645 .read_inode = ext3_read_inode,
646 .write_inode = ext3_write_inode,
647 .dirty_inode = ext3_dirty_inode,
648 .delete_inode = ext3_delete_inode,
649 .put_super = ext3_put_super,
650 .write_super = ext3_write_super,
651 .sync_fs = ext3_sync_fs,
652 .write_super_lockfs = ext3_write_super_lockfs,
653 .unlockfs = ext3_unlockfs,
654 .statfs = ext3_statfs,
655 .remount_fs = ext3_remount,
656 .clear_inode = ext3_clear_inode,
657 .show_options = ext3_show_options,
658#ifdef CONFIG_QUOTA
659 .quota_read = ext3_quota_read,
660 .quota_write = ext3_quota_write,
661#endif
662};
663
664static struct export_operations ext3_export_ops = {
665 .get_parent = ext3_get_parent,
666 .get_dentry = ext3_get_dentry,
667};
668
669enum {
670 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
671 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
672 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
673 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
674 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
675 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
676 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
677 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
678 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
679 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
680 Opt_grpquota
681};
682
683static match_table_t tokens = {
684 {Opt_bsd_df, "bsddf"},
685 {Opt_minix_df, "minixdf"},
686 {Opt_grpid, "grpid"},
687 {Opt_grpid, "bsdgroups"},
688 {Opt_nogrpid, "nogrpid"},
689 {Opt_nogrpid, "sysvgroups"},
690 {Opt_resgid, "resgid=%u"},
691 {Opt_resuid, "resuid=%u"},
692 {Opt_sb, "sb=%u"},
693 {Opt_err_cont, "errors=continue"},
694 {Opt_err_panic, "errors=panic"},
695 {Opt_err_ro, "errors=remount-ro"},
696 {Opt_nouid32, "nouid32"},
697 {Opt_nocheck, "nocheck"},
698 {Opt_nocheck, "check=none"},
699 {Opt_debug, "debug"},
700 {Opt_oldalloc, "oldalloc"},
701 {Opt_orlov, "orlov"},
702 {Opt_user_xattr, "user_xattr"},
703 {Opt_nouser_xattr, "nouser_xattr"},
704 {Opt_acl, "acl"},
705 {Opt_noacl, "noacl"},
706 {Opt_reservation, "reservation"},
707 {Opt_noreservation, "noreservation"},
708 {Opt_noload, "noload"},
709 {Opt_nobh, "nobh"},
710 {Opt_bh, "bh"},
711 {Opt_commit, "commit=%u"},
712 {Opt_journal_update, "journal=update"},
713 {Opt_journal_inum, "journal=%u"},
714 {Opt_journal_dev, "journal_dev=%u"},
715 {Opt_abort, "abort"},
716 {Opt_data_journal, "data=journal"},
717 {Opt_data_ordered, "data=ordered"},
718 {Opt_data_writeback, "data=writeback"},
719 {Opt_offusrjquota, "usrjquota="},
720 {Opt_usrjquota, "usrjquota=%s"},
721 {Opt_offgrpjquota, "grpjquota="},
722 {Opt_grpjquota, "grpjquota=%s"},
723 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
724 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
725 {Opt_grpquota, "grpquota"},
726 {Opt_noquota, "noquota"},
727 {Opt_quota, "quota"},
728 {Opt_usrquota, "usrquota"},
729 {Opt_barrier, "barrier=%u"},
730 {Opt_err, NULL},
731 {Opt_resize, "resize"},
732};
733
734static ext3_fsblk_t get_sb_block(void **data)
735{
736 ext3_fsblk_t sb_block;
737 char *options = (char *) *data;
738
739 if (!options || strncmp(options, "sb=", 3) != 0)
740 return 1; /* Default location */
741 options += 3;
742 /*todo: use simple_strtoll with >32bit ext3 */
743 sb_block = simple_strtoul(options, &options, 0);
744 if (*options && *options != ',') {
745 printk("EXT3-fs: Invalid sb specification: %s\n",
746 (char *) *data);
747 return 1;
748 }
749 if (*options == ',')
750 options++;
751 *data = (void *) options;
752 return sb_block;
753}
754
755static int parse_options (char *options, struct super_block *sb,
756 unsigned int *inum, unsigned long *journal_devnum,
757 ext3_fsblk_t *n_blocks_count, int is_remount)
758{
759 struct ext3_sb_info *sbi = EXT3_SB(sb);
760 char * p;
761 substring_t args[MAX_OPT_ARGS];
762 int data_opt = 0;
763 int option;
764#ifdef CONFIG_QUOTA
765 int qtype;
766 char *qname;
767#endif
768
769 if (!options)
770 return 1;
771
772 while ((p = strsep (&options, ",")) != NULL) {
773 int token;
774 if (!*p)
775 continue;
776
777 token = match_token(p, tokens, args);
778 switch (token) {
779 case Opt_bsd_df:
780 clear_opt (sbi->s_mount_opt, MINIX_DF);
781 break;
782 case Opt_minix_df:
783 set_opt (sbi->s_mount_opt, MINIX_DF);
784 break;
785 case Opt_grpid:
786 set_opt (sbi->s_mount_opt, GRPID);
787 break;
788 case Opt_nogrpid:
789 clear_opt (sbi->s_mount_opt, GRPID);
790 break;
791 case Opt_resuid:
792 if (match_int(&args[0], &option))
793 return 0;
794 sbi->s_resuid = option;
795 break;
796 case Opt_resgid:
797 if (match_int(&args[0], &option))
798 return 0;
799 sbi->s_resgid = option;
800 break;
801 case Opt_sb:
802 /* handled by get_sb_block() instead of here */
803 /* *sb_block = match_int(&args[0]); */
804 break;
805 case Opt_err_panic:
806 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
807 clear_opt (sbi->s_mount_opt, ERRORS_RO);
808 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
809 break;
810 case Opt_err_ro:
811 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
812 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
813 set_opt (sbi->s_mount_opt, ERRORS_RO);
814 break;
815 case Opt_err_cont:
816 clear_opt (sbi->s_mount_opt, ERRORS_RO);
817 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
818 set_opt (sbi->s_mount_opt, ERRORS_CONT);
819 break;
820 case Opt_nouid32:
821 set_opt (sbi->s_mount_opt, NO_UID32);
822 break;
823 case Opt_nocheck:
824 clear_opt (sbi->s_mount_opt, CHECK);
825 break;
826 case Opt_debug:
827 set_opt (sbi->s_mount_opt, DEBUG);
828 break;
829 case Opt_oldalloc:
830 set_opt (sbi->s_mount_opt, OLDALLOC);
831 break;
832 case Opt_orlov:
833 clear_opt (sbi->s_mount_opt, OLDALLOC);
834 break;
835#ifdef CONFIG_EXT3_FS_XATTR
836 case Opt_user_xattr:
837 set_opt (sbi->s_mount_opt, XATTR_USER);
838 break;
839 case Opt_nouser_xattr:
840 clear_opt (sbi->s_mount_opt, XATTR_USER);
841 break;
842#else
843 case Opt_user_xattr:
844 case Opt_nouser_xattr:
845 printk("EXT3 (no)user_xattr options not supported\n");
846 break;
847#endif
848#ifdef CONFIG_EXT3_FS_POSIX_ACL
849 case Opt_acl:
850 set_opt(sbi->s_mount_opt, POSIX_ACL);
851 break;
852 case Opt_noacl:
853 clear_opt(sbi->s_mount_opt, POSIX_ACL);
854 break;
855#else
856 case Opt_acl:
857 case Opt_noacl:
858 printk("EXT3 (no)acl options not supported\n");
859 break;
860#endif
861 case Opt_reservation:
862 set_opt(sbi->s_mount_opt, RESERVATION);
863 break;
864 case Opt_noreservation:
865 clear_opt(sbi->s_mount_opt, RESERVATION);
866 break;
867 case Opt_journal_update:
868 /* @@@ FIXME */
869 /* Eventually we will want to be able to create
870 a journal file here. For now, only allow the
871 user to specify an existing inode to be the
872 journal file. */
873 if (is_remount) {
874 printk(KERN_ERR "EXT3-fs: cannot specify "
875 "journal on remount\n");
876 return 0;
877 }
878 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
879 break;
880 case Opt_journal_inum:
881 if (is_remount) {
882 printk(KERN_ERR "EXT3-fs: cannot specify "
883 "journal on remount\n");
884 return 0;
885 }
886 if (match_int(&args[0], &option))
887 return 0;
888 *inum = option;
889 break;
890 case Opt_journal_dev:
891 if (is_remount) {
892 printk(KERN_ERR "EXT3-fs: cannot specify "
893 "journal on remount\n");
894 return 0;
895 }
896 if (match_int(&args[0], &option))
897 return 0;
898 *journal_devnum = option;
899 break;
900 case Opt_noload:
901 set_opt (sbi->s_mount_opt, NOLOAD);
902 break;
903 case Opt_commit:
904 if (match_int(&args[0], &option))
905 return 0;
906 if (option < 0)
907 return 0;
908 if (option == 0)
909 option = JBD_DEFAULT_MAX_COMMIT_AGE;
910 sbi->s_commit_interval = HZ * option;
911 break;
912 case Opt_data_journal:
913 data_opt = EXT3_MOUNT_JOURNAL_DATA;
914 goto datacheck;
915 case Opt_data_ordered:
916 data_opt = EXT3_MOUNT_ORDERED_DATA;
917 goto datacheck;
918 case Opt_data_writeback:
919 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
920 datacheck:
921 if (is_remount) {
922 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
923 != data_opt) {
924 printk(KERN_ERR
925 "EXT3-fs: cannot change data "
926 "mode on remount\n");
927 return 0;
928 }
929 } else {
930 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
931 sbi->s_mount_opt |= data_opt;
932 }
933 break;
934#ifdef CONFIG_QUOTA
935 case Opt_usrjquota:
936 qtype = USRQUOTA;
937 goto set_qf_name;
938 case Opt_grpjquota:
939 qtype = GRPQUOTA;
940set_qf_name:
941 if (sb_any_quota_enabled(sb)) {
942 printk(KERN_ERR
943 "EXT3-fs: Cannot change journalled "
944 "quota options when quota turned on.\n");
945 return 0;
946 }
947 qname = match_strdup(&args[0]);
948 if (!qname) {
949 printk(KERN_ERR
950 "EXT3-fs: not enough memory for "
951 "storing quotafile name.\n");
952 return 0;
953 }
954 if (sbi->s_qf_names[qtype] &&
955 strcmp(sbi->s_qf_names[qtype], qname)) {
956 printk(KERN_ERR
957 "EXT3-fs: %s quota file already "
958 "specified.\n", QTYPE2NAME(qtype));
959 kfree(qname);
960 return 0;
961 }
962 sbi->s_qf_names[qtype] = qname;
963 if (strchr(sbi->s_qf_names[qtype], '/')) {
964 printk(KERN_ERR
965 "EXT3-fs: quotafile must be on "
966 "filesystem root.\n");
967 kfree(sbi->s_qf_names[qtype]);
968 sbi->s_qf_names[qtype] = NULL;
969 return 0;
970 }
971 set_opt(sbi->s_mount_opt, QUOTA);
972 break;
973 case Opt_offusrjquota:
974 qtype = USRQUOTA;
975 goto clear_qf_name;
976 case Opt_offgrpjquota:
977 qtype = GRPQUOTA;
978clear_qf_name:
979 if (sb_any_quota_enabled(sb)) {
980 printk(KERN_ERR "EXT3-fs: Cannot change "
981 "journalled quota options when "
982 "quota turned on.\n");
983 return 0;
984 }
985 /*
986 * The space will be released later when all options
987 * are confirmed to be correct
988 */
989 sbi->s_qf_names[qtype] = NULL;
990 break;
991 case Opt_jqfmt_vfsold:
992 sbi->s_jquota_fmt = QFMT_VFS_OLD;
993 break;
994 case Opt_jqfmt_vfsv0:
995 sbi->s_jquota_fmt = QFMT_VFS_V0;
996 break;
997 case Opt_quota:
998 case Opt_usrquota:
999 set_opt(sbi->s_mount_opt, QUOTA);
1000 set_opt(sbi->s_mount_opt, USRQUOTA);
1001 break;
1002 case Opt_grpquota:
1003 set_opt(sbi->s_mount_opt, QUOTA);
1004 set_opt(sbi->s_mount_opt, GRPQUOTA);
1005 break;
1006 case Opt_noquota:
1007 if (sb_any_quota_enabled(sb)) {
1008 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1009 "options when quota turned on.\n");
1010 return 0;
1011 }
1012 clear_opt(sbi->s_mount_opt, QUOTA);
1013 clear_opt(sbi->s_mount_opt, USRQUOTA);
1014 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1015 break;
1016#else
1017 case Opt_quota:
1018 case Opt_usrquota:
1019 case Opt_grpquota:
1020 case Opt_usrjquota:
1021 case Opt_grpjquota:
1022 case Opt_offusrjquota:
1023 case Opt_offgrpjquota:
1024 case Opt_jqfmt_vfsold:
1025 case Opt_jqfmt_vfsv0:
1026 printk(KERN_ERR
1027 "EXT3-fs: journalled quota options not "
1028 "supported.\n");
1029 break;
1030 case Opt_noquota:
1031 break;
1032#endif
1033 case Opt_abort:
1034 set_opt(sbi->s_mount_opt, ABORT);
1035 break;
1036 case Opt_barrier:
1037 if (match_int(&args[0], &option))
1038 return 0;
1039 if (option)
1040 set_opt(sbi->s_mount_opt, BARRIER);
1041 else
1042 clear_opt(sbi->s_mount_opt, BARRIER);
1043 break;
1044 case Opt_ignore:
1045 break;
1046 case Opt_resize:
1047 if (!is_remount) {
1048 printk("EXT3-fs: resize option only available "
1049 "for remount\n");
1050 return 0;
1051 }
1052 if (match_int(&args[0], &option) != 0)
1053 return 0;
1054 *n_blocks_count = option;
1055 break;
1056 case Opt_nobh:
1057 set_opt(sbi->s_mount_opt, NOBH);
1058 break;
1059 case Opt_bh:
1060 clear_opt(sbi->s_mount_opt, NOBH);
1061 break;
1062 default:
1063 printk (KERN_ERR
1064 "EXT3-fs: Unrecognized mount option \"%s\" "
1065 "or missing value\n", p);
1066 return 0;
1067 }
1068 }
1069#ifdef CONFIG_QUOTA
1070 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1071 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1072 sbi->s_qf_names[USRQUOTA])
1073 clear_opt(sbi->s_mount_opt, USRQUOTA);
1074
1075 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1076 sbi->s_qf_names[GRPQUOTA])
1077 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1078
1079 if ((sbi->s_qf_names[USRQUOTA] &&
1080 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1081 (sbi->s_qf_names[GRPQUOTA] &&
1082 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1083 printk(KERN_ERR "EXT3-fs: old and new quota "
1084 "format mixing.\n");
1085 return 0;
1086 }
1087
1088 if (!sbi->s_jquota_fmt) {
1089 printk(KERN_ERR "EXT3-fs: journalled quota format "
1090 "not specified.\n");
1091 return 0;
1092 }
1093 } else {
1094 if (sbi->s_jquota_fmt) {
1095 printk(KERN_ERR "EXT3-fs: journalled quota format "
1096 "specified with no journalling "
1097 "enabled.\n");
1098 return 0;
1099 }
1100 }
1101#endif
1102 return 1;
1103}
1104
1105static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1106 int read_only)
1107{
1108 struct ext3_sb_info *sbi = EXT3_SB(sb);
1109 int res = 0;
1110
1111 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1112 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1113 "forcing read-only mode\n");
1114 res = MS_RDONLY;
1115 }
1116 if (read_only)
1117 return res;
1118 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1119 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1120 "running e2fsck is recommended\n");
1121 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1122 printk (KERN_WARNING
1123 "EXT3-fs warning: mounting fs with errors, "
1124 "running e2fsck is recommended\n");
1125 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1126 le16_to_cpu(es->s_mnt_count) >=
1127 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1128 printk (KERN_WARNING
1129 "EXT3-fs warning: maximal mount count reached, "
1130 "running e2fsck is recommended\n");
1131 else if (le32_to_cpu(es->s_checkinterval) &&
1132 (le32_to_cpu(es->s_lastcheck) +
1133 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1134 printk (KERN_WARNING
1135 "EXT3-fs warning: checktime reached, "
1136 "running e2fsck is recommended\n");
1137#if 0
1138 /* @@@ We _will_ want to clear the valid bit if we find
1139 inconsistencies, to force a fsck at reboot. But for
1140 a plain journaled filesystem we can keep it set as
1141 valid forever! :) */
1142 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1143#endif
1144 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1145 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1146 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1147 es->s_mtime = cpu_to_le32(get_seconds());
1148 ext3_update_dynamic_rev(sb);
1149 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1150
1151 ext3_commit_super(sb, es, 1);
1152 if (test_opt(sb, DEBUG))
1153 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1154 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1155 sb->s_blocksize,
1156 sbi->s_groups_count,
1157 EXT3_BLOCKS_PER_GROUP(sb),
1158 EXT3_INODES_PER_GROUP(sb),
1159 sbi->s_mount_opt);
1160
1161 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1162 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1163 char b[BDEVNAME_SIZE];
1164
1165 printk("external journal on %s\n",
1166 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1167 } else {
1168 printk("internal journal\n");
1169 }
1170 return res;
1171}
1172
1173/* Called at mount-time, super-block is locked */
1174static int ext3_check_descriptors (struct super_block * sb)
1175{
1176 struct ext3_sb_info *sbi = EXT3_SB(sb);
1177 ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1178 ext3_fsblk_t last_block;
1179 struct ext3_group_desc * gdp = NULL;
1180 int desc_block = 0;
1181 int i;
1182
1183 ext3_debug ("Checking group descriptors");
1184
1185 for (i = 0; i < sbi->s_groups_count; i++)
1186 {
1187 if (i == sbi->s_groups_count - 1)
1188 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1189 else
1190 last_block = first_block +
1191 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1192
1193 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1194 gdp = (struct ext3_group_desc *)
1195 sbi->s_group_desc[desc_block++]->b_data;
1196 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1197 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1198 {
1199 ext3_error (sb, "ext3_check_descriptors",
1200 "Block bitmap for group %d"
1201 " not in group (block %lu)!",
1202 i, (unsigned long)
1203 le32_to_cpu(gdp->bg_block_bitmap));
1204 return 0;
1205 }
1206 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1207 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1208 {
1209 ext3_error (sb, "ext3_check_descriptors",
1210 "Inode bitmap for group %d"
1211 " not in group (block %lu)!",
1212 i, (unsigned long)
1213 le32_to_cpu(gdp->bg_inode_bitmap));
1214 return 0;
1215 }
1216 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1217 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
1218 last_block)
1219 {
1220 ext3_error (sb, "ext3_check_descriptors",
1221 "Inode table for group %d"
1222 " not in group (block %lu)!",
1223 i, (unsigned long)
1224 le32_to_cpu(gdp->bg_inode_table));
1225 return 0;
1226 }
1227 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1228 gdp++;
1229 }
1230
1231 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1232 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1233 return 1;
1234}
1235
1236
1237/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1238 * the superblock) which were deleted from all directories, but held open by
1239 * a process at the time of a crash. We walk the list and try to delete these
1240 * inodes at recovery time (only with a read-write filesystem).
1241 *
1242 * In order to keep the orphan inode chain consistent during traversal (in
1243 * case of crash during recovery), we link each inode into the superblock
1244 * orphan list_head and handle it the same way as an inode deletion during
1245 * normal operation (which journals the operations for us).
1246 *
1247 * We only do an iget() and an iput() on each inode, which is very safe if we
1248 * accidentally point at an in-use or already deleted inode. The worst that
1249 * can happen in this case is that we get a "bit already cleared" message from
1250 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1251 * e2fsck was run on this filesystem, and it must have already done the orphan
1252 * inode cleanup for us, so we can safely abort without any further action.
1253 */
1254static void ext3_orphan_cleanup (struct super_block * sb,
1255 struct ext3_super_block * es)
1256{
1257 unsigned int s_flags = sb->s_flags;
1258 int nr_orphans = 0, nr_truncates = 0;
1259#ifdef CONFIG_QUOTA
1260 int i;
1261#endif
1262 if (!es->s_last_orphan) {
1263 jbd_debug(4, "no orphan inodes to clean up\n");
1264 return;
1265 }
1266
1267 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1268 if (es->s_last_orphan)
1269 jbd_debug(1, "Errors on filesystem, "
1270 "clearing orphan list.\n");
1271 es->s_last_orphan = 0;
1272 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1273 return;
1274 }
1275
1276 if (s_flags & MS_RDONLY) {
1277 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1278 sb->s_id);
1279 sb->s_flags &= ~MS_RDONLY;
1280 }
1281#ifdef CONFIG_QUOTA
1282 /* Needed for iput() to work correctly and not trash data */
1283 sb->s_flags |= MS_ACTIVE;
1284 /* Turn on quotas so that they are updated correctly */
1285 for (i = 0; i < MAXQUOTAS; i++) {
1286 if (EXT3_SB(sb)->s_qf_names[i]) {
1287 int ret = ext3_quota_on_mount(sb, i);
1288 if (ret < 0)
1289 printk(KERN_ERR
1290 "EXT3-fs: Cannot turn on journalled "
1291 "quota: error %d\n", ret);
1292 }
1293 }
1294#endif
1295
1296 while (es->s_last_orphan) {
1297 struct inode *inode;
1298
1299 if (!(inode =
1300 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1301 es->s_last_orphan = 0;
1302 break;
1303 }
1304
1305 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1306 DQUOT_INIT(inode);
1307 if (inode->i_nlink) {
1308 printk(KERN_DEBUG
1309 "%s: truncating inode %lu to %Ld bytes\n",
1310 __FUNCTION__, inode->i_ino, inode->i_size);
1311 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1312 inode->i_ino, inode->i_size);
1313 ext3_truncate(inode);
1314 nr_truncates++;
1315 } else {
1316 printk(KERN_DEBUG
1317 "%s: deleting unreferenced inode %lu\n",
1318 __FUNCTION__, inode->i_ino);
1319 jbd_debug(2, "deleting unreferenced inode %lu\n",
1320 inode->i_ino);
1321 nr_orphans++;
1322 }
1323 iput(inode); /* The delete magic happens here! */
1324 }
1325
1326#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1327
1328 if (nr_orphans)
1329 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1330 sb->s_id, PLURAL(nr_orphans));
1331 if (nr_truncates)
1332 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1333 sb->s_id, PLURAL(nr_truncates));
1334#ifdef CONFIG_QUOTA
1335 /* Turn quotas off */
1336 for (i = 0; i < MAXQUOTAS; i++) {
1337 if (sb_dqopt(sb)->files[i])
1338 vfs_quota_off(sb, i);
1339 }
1340#endif
1341 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1342}
1343
1344#define log2(n) ffz(~(n))
1345
1346/*
1347 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1348 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1349 * We need to be 1 filesystem block less than the 2^32 sector limit.
1350 */
1351static loff_t ext3_max_size(int bits)
1352{
1353 loff_t res = EXT3_NDIR_BLOCKS;
1354 /* This constant is calculated to be the largest file size for a
1355 * dense, 4k-blocksize file such that the total number of
1356 * sectors in the file, including data and all indirect blocks,
1357 * does not exceed 2^32. */
1358 const loff_t upper_limit = 0x1ff7fffd000LL;
1359
1360 res += 1LL << (bits-2);
1361 res += 1LL << (2*(bits-2));
1362 res += 1LL << (3*(bits-2));
1363 res <<= bits;
1364 if (res > upper_limit)
1365 res = upper_limit;
1366 return res;
1367}
1368
1369static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1370 ext3_fsblk_t logic_sb_block,
1371 int nr)
1372{
1373 struct ext3_sb_info *sbi = EXT3_SB(sb);
1374 unsigned long bg, first_meta_bg;
1375 int has_super = 0;
1376
1377 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1378
1379 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1380 nr < first_meta_bg)
1381 return (logic_sb_block + nr + 1);
1382 bg = sbi->s_desc_per_block * nr;
1383 if (ext3_bg_has_super(sb, bg))
1384 has_super = 1;
1385 return (has_super + ext3_group_first_block_no(sb, bg));
1386}
1387
1388
1389static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1390{
1391 struct buffer_head * bh;
1392 struct ext3_super_block *es = NULL;
1393 struct ext3_sb_info *sbi;
1394 ext3_fsblk_t block;
1395 ext3_fsblk_t sb_block = get_sb_block(&data);
1396 ext3_fsblk_t logic_sb_block;
1397 unsigned long offset = 0;
1398 unsigned int journal_inum = 0;
1399 unsigned long journal_devnum = 0;
1400 unsigned long def_mount_opts;
1401 struct inode *root;
1402 int blocksize;
1403 int hblock;
1404 int db_count;
1405 int i;
1406 int needs_recovery;
1407 __le32 features;
1408
1409 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1410 if (!sbi)
1411 return -ENOMEM;
1412 sb->s_fs_info = sbi;
1413 sbi->s_mount_opt = 0;
1414 sbi->s_resuid = EXT3_DEF_RESUID;
1415 sbi->s_resgid = EXT3_DEF_RESGID;
1416
1417 unlock_kernel();
1418
1419 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1420 if (!blocksize) {
1421 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1422 goto out_fail;
1423 }
1424
1425 /*
1426 * The ext3 superblock will not be buffer aligned for other than 1kB
1427 * block sizes. We need to calculate the offset from buffer start.
1428 */
1429 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1430 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1431 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1432 } else {
1433 logic_sb_block = sb_block;
1434 }
1435
1436 if (!(bh = sb_bread(sb, logic_sb_block))) {
1437 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1438 goto out_fail;
1439 }
1440 /*
1441 * Note: s_es must be initialized as soon as possible because
1442 * some ext3 macro-instructions depend on its value
1443 */
1444 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1445 sbi->s_es = es;
1446 sb->s_magic = le16_to_cpu(es->s_magic);
1447 if (sb->s_magic != EXT3_SUPER_MAGIC)
1448 goto cantfind_ext3;
1449
1450 /* Set defaults before we parse the mount options */
1451 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1452 if (def_mount_opts & EXT3_DEFM_DEBUG)
1453 set_opt(sbi->s_mount_opt, DEBUG);
1454 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1455 set_opt(sbi->s_mount_opt, GRPID);
1456 if (def_mount_opts & EXT3_DEFM_UID16)
1457 set_opt(sbi->s_mount_opt, NO_UID32);
1458 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1459 set_opt(sbi->s_mount_opt, XATTR_USER);
1460 if (def_mount_opts & EXT3_DEFM_ACL)
1461 set_opt(sbi->s_mount_opt, POSIX_ACL);
1462 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1463 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1464 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1465 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1466 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1467 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1468
1469 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1470 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1471 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1472 set_opt(sbi->s_mount_opt, ERRORS_RO);
1473
1474 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1475 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1476
1477 set_opt(sbi->s_mount_opt, RESERVATION);
1478
1479 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1480 NULL, 0))
1481 goto failed_mount;
1482
1483 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1484 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1485
1486 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1487 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1488 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1489 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1490 printk(KERN_WARNING
1491 "EXT3-fs warning: feature flags set on rev 0 fs, "
1492 "running e2fsck is recommended\n");
1493 /*
1494 * Check feature flags regardless of the revision level, since we
1495 * previously didn't change the revision level when setting the flags,
1496 * so there is a chance incompat flags are set on a rev 0 filesystem.
1497 */
1498 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1499 if (features) {
1500 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1501 "unsupported optional features (%x).\n",
1502 sb->s_id, le32_to_cpu(features));
1503 goto failed_mount;
1504 }
1505 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1506 if (!(sb->s_flags & MS_RDONLY) && features) {
1507 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1508 "unsupported optional features (%x).\n",
1509 sb->s_id, le32_to_cpu(features));
1510 goto failed_mount;
1511 }
1512 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1513
1514 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1515 blocksize > EXT3_MAX_BLOCK_SIZE) {
1516 printk(KERN_ERR
1517 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1518 blocksize, sb->s_id);
1519 goto failed_mount;
1520 }
1521
1522 hblock = bdev_hardsect_size(sb->s_bdev);
1523 if (sb->s_blocksize != blocksize) {
1524 /*
1525 * Make sure the blocksize for the filesystem is larger
1526 * than the hardware sectorsize for the machine.
1527 */
1528 if (blocksize < hblock) {
1529 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1530 "device blocksize %d.\n", blocksize, hblock);
1531 goto failed_mount;
1532 }
1533
1534 brelse (bh);
1535 sb_set_blocksize(sb, blocksize);
1536 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1537 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1538 bh = sb_bread(sb, logic_sb_block);
1539 if (!bh) {
1540 printk(KERN_ERR
1541 "EXT3-fs: Can't read superblock on 2nd try.\n");
1542 goto failed_mount;
1543 }
1544 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1545 sbi->s_es = es;
1546 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1547 printk (KERN_ERR
1548 "EXT3-fs: Magic mismatch, very weird !\n");
1549 goto failed_mount;
1550 }
1551 }
1552
1553 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1554
1555 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1556 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1557 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1558 } else {
1559 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1560 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1561 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1562 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1563 (sbi->s_inode_size > blocksize)) {
1564 printk (KERN_ERR
1565 "EXT3-fs: unsupported inode size: %d\n",
1566 sbi->s_inode_size);
1567 goto failed_mount;
1568 }
1569 }
1570 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1571 le32_to_cpu(es->s_log_frag_size);
1572 if (blocksize != sbi->s_frag_size) {
1573 printk(KERN_ERR
1574 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1575 sbi->s_frag_size, blocksize);
1576 goto failed_mount;
1577 }
1578 sbi->s_frags_per_block = 1;
1579 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1580 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1581 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1582 if (EXT3_INODE_SIZE(sb) == 0)
1583 goto cantfind_ext3;
1584 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1585 if (sbi->s_inodes_per_block == 0)
1586 goto cantfind_ext3;
1587 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1588 sbi->s_inodes_per_block;
1589 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1590 sbi->s_sbh = bh;
1591 sbi->s_mount_state = le16_to_cpu(es->s_state);
1592 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1593 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1594 for (i=0; i < 4; i++)
1595 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1596 sbi->s_def_hash_version = es->s_def_hash_version;
1597
1598 if (sbi->s_blocks_per_group > blocksize * 8) {
1599 printk (KERN_ERR
1600 "EXT3-fs: #blocks per group too big: %lu\n",
1601 sbi->s_blocks_per_group);
1602 goto failed_mount;
1603 }
1604 if (sbi->s_frags_per_group > blocksize * 8) {
1605 printk (KERN_ERR
1606 "EXT3-fs: #fragments per group too big: %lu\n",
1607 sbi->s_frags_per_group);
1608 goto failed_mount;
1609 }
1610 if (sbi->s_inodes_per_group > blocksize * 8) {
1611 printk (KERN_ERR
1612 "EXT3-fs: #inodes per group too big: %lu\n",
1613 sbi->s_inodes_per_group);
1614 goto failed_mount;
1615 }
1616
1617 if (le32_to_cpu(es->s_blocks_count) >
1618 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1619 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1620 " too large to mount safely\n", sb->s_id);
1621 if (sizeof(sector_t) < 8)
1622 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1623 "enabled\n");
1624 goto failed_mount;
1625 }
1626
1627 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1628 goto cantfind_ext3;
1629 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1630 le32_to_cpu(es->s_first_data_block) - 1)
1631 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1632 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1633 EXT3_DESC_PER_BLOCK(sb);
1634 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1635 GFP_KERNEL);
1636 if (sbi->s_group_desc == NULL) {
1637 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1638 goto failed_mount;
1639 }
1640
1641 bgl_lock_init(&sbi->s_blockgroup_lock);
1642
1643 for (i = 0; i < db_count; i++) {
1644 block = descriptor_loc(sb, logic_sb_block, i);
1645 sbi->s_group_desc[i] = sb_bread(sb, block);
1646 if (!sbi->s_group_desc[i]) {
1647 printk (KERN_ERR "EXT3-fs: "
1648 "can't read group descriptor %d\n", i);
1649 db_count = i;
1650 goto failed_mount2;
1651 }
1652 }
1653 if (!ext3_check_descriptors (sb)) {
1654 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1655 goto failed_mount2;
1656 }
1657 sbi->s_gdb_count = db_count;
1658 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1659 spin_lock_init(&sbi->s_next_gen_lock);
1660
1661 percpu_counter_init(&sbi->s_freeblocks_counter,
1662 ext3_count_free_blocks(sb));
1663 percpu_counter_init(&sbi->s_freeinodes_counter,
1664 ext3_count_free_inodes(sb));
1665 percpu_counter_init(&sbi->s_dirs_counter,
1666 ext3_count_dirs(sb));
1667
1668 /* per fileystem reservation list head & lock */
1669 spin_lock_init(&sbi->s_rsv_window_lock);
1670 sbi->s_rsv_window_root = RB_ROOT;
1671 /* Add a single, static dummy reservation to the start of the
1672 * reservation window list --- it gives us a placeholder for
1673 * append-at-start-of-list which makes the allocation logic
1674 * _much_ simpler. */
1675 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1676 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1677 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1678 sbi->s_rsv_window_head.rsv_goal_size = 0;
1679 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1680
1681 /*
1682 * set up enough so that it can read an inode
1683 */
1684 sb->s_op = &ext3_sops;
1685 sb->s_export_op = &ext3_export_ops;
1686 sb->s_xattr = ext3_xattr_handlers;
1687#ifdef CONFIG_QUOTA
1688 sb->s_qcop = &ext3_qctl_operations;
1689 sb->dq_op = &ext3_quota_operations;
1690#endif
1691 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1692
1693 sb->s_root = NULL;
1694
1695 needs_recovery = (es->s_last_orphan != 0 ||
1696 EXT3_HAS_INCOMPAT_FEATURE(sb,
1697 EXT3_FEATURE_INCOMPAT_RECOVER));
1698
1699 /*
1700 * The first inode we look at is the journal inode. Don't try
1701 * root first: it may be modified in the journal!
1702 */
1703 if (!test_opt(sb, NOLOAD) &&
1704 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1705 if (ext3_load_journal(sb, es, journal_devnum))
1706 goto failed_mount3;
1707 } else if (journal_inum) {
1708 if (ext3_create_journal(sb, es, journal_inum))
1709 goto failed_mount3;
1710 } else {
1711 if (!silent)
1712 printk (KERN_ERR
1713 "ext3: No journal on filesystem on %s\n",
1714 sb->s_id);
1715 goto failed_mount3;
1716 }
1717
1718 /* We have now updated the journal if required, so we can
1719 * validate the data journaling mode. */
1720 switch (test_opt(sb, DATA_FLAGS)) {
1721 case 0:
1722 /* No mode set, assume a default based on the journal
1723 capabilities: ORDERED_DATA if the journal can
1724 cope, else JOURNAL_DATA */
1725 if (journal_check_available_features
1726 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1727 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1728 else
1729 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1730 break;
1731
1732 case EXT3_MOUNT_ORDERED_DATA:
1733 case EXT3_MOUNT_WRITEBACK_DATA:
1734 if (!journal_check_available_features
1735 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1736 printk(KERN_ERR "EXT3-fs: Journal does not support "
1737 "requested data journaling mode\n");
1738 goto failed_mount4;
1739 }
1740 default:
1741 break;
1742 }
1743
1744 if (test_opt(sb, NOBH)) {
1745 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1746 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1747 "its supported only with writeback mode\n");
1748 clear_opt(sbi->s_mount_opt, NOBH);
1749 }
1750 }
1751 /*
1752 * The journal_load will have done any necessary log recovery,
1753 * so we can safely mount the rest of the filesystem now.
1754 */
1755
1756 root = iget(sb, EXT3_ROOT_INO);
1757 sb->s_root = d_alloc_root(root);
1758 if (!sb->s_root) {
1759 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1760 iput(root);
1761 goto failed_mount4;
1762 }
1763 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1764 dput(sb->s_root);
1765 sb->s_root = NULL;
1766 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1767 goto failed_mount4;
1768 }
1769
1770 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1771 /*
1772 * akpm: core read_super() calls in here with the superblock locked.
1773 * That deadlocks, because orphan cleanup needs to lock the superblock
1774 * in numerous places. Here we just pop the lock - it's relatively
1775 * harmless, because we are now ready to accept write_super() requests,
1776 * and aviro says that's the only reason for hanging onto the
1777 * superblock lock.
1778 */
1779 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1780 ext3_orphan_cleanup(sb, es);
1781 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1782 if (needs_recovery)
1783 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1784 ext3_mark_recovery_complete(sb, es);
1785 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1786 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1787 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1788 "writeback");
1789
1790 lock_kernel();
1791 return 0;
1792
1793cantfind_ext3:
1794 if (!silent)
1795 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1796 sb->s_id);
1797 goto failed_mount;
1798
1799failed_mount4:
1800 journal_destroy(sbi->s_journal);
1801failed_mount3:
1802 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1803 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1804 percpu_counter_destroy(&sbi->s_dirs_counter);
1805failed_mount2:
1806 for (i = 0; i < db_count; i++)
1807 brelse(sbi->s_group_desc[i]);
1808 kfree(sbi->s_group_desc);
1809failed_mount:
1810#ifdef CONFIG_QUOTA
1811 for (i = 0; i < MAXQUOTAS; i++)
1812 kfree(sbi->s_qf_names[i]);
1813#endif
1814 ext3_blkdev_remove(sbi);
1815 brelse(bh);
1816out_fail:
1817 sb->s_fs_info = NULL;
1818 kfree(sbi);
1819 lock_kernel();
1820 return -EINVAL;
1821}
1822
1823/*
1824 * Setup any per-fs journal parameters now. We'll do this both on
1825 * initial mount, once the journal has been initialised but before we've
1826 * done any recovery; and again on any subsequent remount.
1827 */
1828static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1829{
1830 struct ext3_sb_info *sbi = EXT3_SB(sb);
1831
1832 if (sbi->s_commit_interval)
1833 journal->j_commit_interval = sbi->s_commit_interval;
1834 /* We could also set up an ext3-specific default for the commit
1835 * interval here, but for now we'll just fall back to the jbd
1836 * default. */
1837
1838 spin_lock(&journal->j_state_lock);
1839 if (test_opt(sb, BARRIER))
1840 journal->j_flags |= JFS_BARRIER;
1841 else
1842 journal->j_flags &= ~JFS_BARRIER;
1843 spin_unlock(&journal->j_state_lock);
1844}
1845
1846static journal_t *ext3_get_journal(struct super_block *sb,
1847 unsigned int journal_inum)
1848{
1849 struct inode *journal_inode;
1850 journal_t *journal;
1851
1852 /* First, test for the existence of a valid inode on disk. Bad
1853 * things happen if we iget() an unused inode, as the subsequent
1854 * iput() will try to delete it. */
1855
1856 journal_inode = iget(sb, journal_inum);
1857 if (!journal_inode) {
1858 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1859 return NULL;
1860 }
1861 if (!journal_inode->i_nlink) {
1862 make_bad_inode(journal_inode);
1863 iput(journal_inode);
1864 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1865 return NULL;
1866 }
1867
1868 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1869 journal_inode, journal_inode->i_size);
1870 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1871 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1872 iput(journal_inode);
1873 return NULL;
1874 }
1875
1876 journal = journal_init_inode(journal_inode);
1877 if (!journal) {
1878 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1879 iput(journal_inode);
1880 return NULL;
1881 }
1882 journal->j_private = sb;
1883 ext3_init_journal_params(sb, journal);
1884 return journal;
1885}
1886
1887static journal_t *ext3_get_dev_journal(struct super_block *sb,
1888 dev_t j_dev)
1889{
1890 struct buffer_head * bh;
1891 journal_t *journal;
1892 ext3_fsblk_t start;
1893 ext3_fsblk_t len;
1894 int hblock, blocksize;
1895 ext3_fsblk_t sb_block;
1896 unsigned long offset;
1897 struct ext3_super_block * es;
1898 struct block_device *bdev;
1899
1900 bdev = ext3_blkdev_get(j_dev);
1901 if (bdev == NULL)
1902 return NULL;
1903
1904 if (bd_claim(bdev, sb)) {
1905 printk(KERN_ERR
1906 "EXT3: failed to claim external journal device.\n");
1907 blkdev_put(bdev);
1908 return NULL;
1909 }
1910
1911 blocksize = sb->s_blocksize;
1912 hblock = bdev_hardsect_size(bdev);
1913 if (blocksize < hblock) {
1914 printk(KERN_ERR
1915 "EXT3-fs: blocksize too small for journal device.\n");
1916 goto out_bdev;
1917 }
1918
1919 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1920 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1921 set_blocksize(bdev, blocksize);
1922 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1923 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1924 "external journal\n");
1925 goto out_bdev;
1926 }
1927
1928 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1929 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1930 !(le32_to_cpu(es->s_feature_incompat) &
1931 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1932 printk(KERN_ERR "EXT3-fs: external journal has "
1933 "bad superblock\n");
1934 brelse(bh);
1935 goto out_bdev;
1936 }
1937
1938 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1939 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1940 brelse(bh);
1941 goto out_bdev;
1942 }
1943
1944 len = le32_to_cpu(es->s_blocks_count);
1945 start = sb_block + 1;
1946 brelse(bh); /* we're done with the superblock */
1947
1948 journal = journal_init_dev(bdev, sb->s_bdev,
1949 start, len, blocksize);
1950 if (!journal) {
1951 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1952 goto out_bdev;
1953 }
1954 journal->j_private = sb;
1955 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1956 wait_on_buffer(journal->j_sb_buffer);
1957 if (!buffer_uptodate(journal->j_sb_buffer)) {
1958 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1959 goto out_journal;
1960 }
1961 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1962 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1963 "user (unsupported) - %d\n",
1964 be32_to_cpu(journal->j_superblock->s_nr_users));
1965 goto out_journal;
1966 }
1967 EXT3_SB(sb)->journal_bdev = bdev;
1968 ext3_init_journal_params(sb, journal);
1969 return journal;
1970out_journal:
1971 journal_destroy(journal);
1972out_bdev:
1973 ext3_blkdev_put(bdev);
1974 return NULL;
1975}
1976
1977static int ext3_load_journal(struct super_block *sb,
1978 struct ext3_super_block *es,
1979 unsigned long journal_devnum)
1980{
1981 journal_t *journal;
1982 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
1983 dev_t journal_dev;
1984 int err = 0;
1985 int really_read_only;
1986
1987 if (journal_devnum &&
1988 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1989 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1990 "numbers have changed\n");
1991 journal_dev = new_decode_dev(journal_devnum);
1992 } else
1993 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1994
1995 really_read_only = bdev_read_only(sb->s_bdev);
1996
1997 /*
1998 * Are we loading a blank journal or performing recovery after a
1999 * crash? For recovery, we need to check in advance whether we
2000 * can get read-write access to the device.
2001 */
2002
2003 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2004 if (sb->s_flags & MS_RDONLY) {
2005 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2006 "required on readonly filesystem.\n");
2007 if (really_read_only) {
2008 printk(KERN_ERR "EXT3-fs: write access "
2009 "unavailable, cannot proceed.\n");
2010 return -EROFS;
2011 }
2012 printk (KERN_INFO "EXT3-fs: write access will "
2013 "be enabled during recovery.\n");
2014 }
2015 }
2016
2017 if (journal_inum && journal_dev) {
2018 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2019 "and inode journals!\n");
2020 return -EINVAL;
2021 }
2022
2023 if (journal_inum) {
2024 if (!(journal = ext3_get_journal(sb, journal_inum)))
2025 return -EINVAL;
2026 } else {
2027 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2028 return -EINVAL;
2029 }
2030
2031 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2032 err = journal_update_format(journal);
2033 if (err) {
2034 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2035 journal_destroy(journal);
2036 return err;
2037 }
2038 }
2039
2040 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2041 err = journal_wipe(journal, !really_read_only);
2042 if (!err)
2043 err = journal_load(journal);
2044
2045 if (err) {
2046 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2047 journal_destroy(journal);
2048 return err;
2049 }
2050
2051 EXT3_SB(sb)->s_journal = journal;
2052 ext3_clear_journal_err(sb, es);
2053
2054 if (journal_devnum &&
2055 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2056 es->s_journal_dev = cpu_to_le32(journal_devnum);
2057 sb->s_dirt = 1;
2058
2059 /* Make sure we flush the recovery flag to disk. */
2060 ext3_commit_super(sb, es, 1);
2061 }
2062
2063 return 0;
2064}
2065
2066static int ext3_create_journal(struct super_block * sb,
2067 struct ext3_super_block * es,
2068 unsigned int journal_inum)
2069{
2070 journal_t *journal;
2071
2072 if (sb->s_flags & MS_RDONLY) {
2073 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2074 "create journal.\n");
2075 return -EROFS;
2076 }
2077
2078 if (!(journal = ext3_get_journal(sb, journal_inum)))
2079 return -EINVAL;
2080
2081 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2082 journal_inum);
2083
2084 if (journal_create(journal)) {
2085 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2086 journal_destroy(journal);
2087 return -EIO;
2088 }
2089
2090 EXT3_SB(sb)->s_journal = journal;
2091
2092 ext3_update_dynamic_rev(sb);
2093 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2094 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2095
2096 es->s_journal_inum = cpu_to_le32(journal_inum);
2097 sb->s_dirt = 1;
2098
2099 /* Make sure we flush the recovery flag to disk. */
2100 ext3_commit_super(sb, es, 1);
2101
2102 return 0;
2103}
2104
2105static void ext3_commit_super (struct super_block * sb,
2106 struct ext3_super_block * es,
2107 int sync)
2108{
2109 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2110
2111 if (!sbh)
2112 return;
2113 es->s_wtime = cpu_to_le32(get_seconds());
2114 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2115 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2116 BUFFER_TRACE(sbh, "marking dirty");
2117 mark_buffer_dirty(sbh);
2118 if (sync)
2119 sync_dirty_buffer(sbh);
2120}
2121
2122
2123/*
2124 * Have we just finished recovery? If so, and if we are mounting (or
2125 * remounting) the filesystem readonly, then we will end up with a
2126 * consistent fs on disk. Record that fact.
2127 */
2128static void ext3_mark_recovery_complete(struct super_block * sb,
2129 struct ext3_super_block * es)
2130{
2131 journal_t *journal = EXT3_SB(sb)->s_journal;
2132
2133 journal_lock_updates(journal);
2134 journal_flush(journal);
2135 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2136 sb->s_flags & MS_RDONLY) {
2137 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2138 sb->s_dirt = 0;
2139 ext3_commit_super(sb, es, 1);
2140 }
2141 journal_unlock_updates(journal);
2142}
2143
2144/*
2145 * If we are mounting (or read-write remounting) a filesystem whose journal
2146 * has recorded an error from a previous lifetime, move that error to the
2147 * main filesystem now.
2148 */
2149static void ext3_clear_journal_err(struct super_block * sb,
2150 struct ext3_super_block * es)
2151{
2152 journal_t *journal;
2153 int j_errno;
2154 const char *errstr;
2155
2156 journal = EXT3_SB(sb)->s_journal;
2157
2158 /*
2159 * Now check for any error status which may have been recorded in the
2160 * journal by a prior ext3_error() or ext3_abort()
2161 */
2162
2163 j_errno = journal_errno(journal);
2164 if (j_errno) {
2165 char nbuf[16];
2166
2167 errstr = ext3_decode_error(sb, j_errno, nbuf);
2168 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2169 "from previous mount: %s", errstr);
2170 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2171 "filesystem check.");
2172
2173 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2174 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2175 ext3_commit_super (sb, es, 1);
2176
2177 journal_clear_err(journal);
2178 }
2179}
2180
2181/*
2182 * Force the running and committing transactions to commit,
2183 * and wait on the commit.
2184 */
2185int ext3_force_commit(struct super_block *sb)
2186{
2187 journal_t *journal;
2188 int ret;
2189
2190 if (sb->s_flags & MS_RDONLY)
2191 return 0;
2192
2193 journal = EXT3_SB(sb)->s_journal;
2194 sb->s_dirt = 0;
2195 ret = ext3_journal_force_commit(journal);
2196 return ret;
2197}
2198
2199/*
2200 * Ext3 always journals updates to the superblock itself, so we don't
2201 * have to propagate any other updates to the superblock on disk at this
2202 * point. Just start an async writeback to get the buffers on their way
2203 * to the disk.
2204 *
2205 * This implicitly triggers the writebehind on sync().
2206 */
2207
2208static void ext3_write_super (struct super_block * sb)
2209{
2210 if (mutex_trylock(&sb->s_lock) != 0)
2211 BUG();
2212 sb->s_dirt = 0;
2213}
2214
2215static int ext3_sync_fs(struct super_block *sb, int wait)
2216{
2217 tid_t target;
2218
2219 sb->s_dirt = 0;
2220 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2221 if (wait)
2222 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2223 }
2224 return 0;
2225}
2226
2227/*
2228 * LVM calls this function before a (read-only) snapshot is created. This
2229 * gives us a chance to flush the journal completely and mark the fs clean.
2230 */
2231static void ext3_write_super_lockfs(struct super_block *sb)
2232{
2233 sb->s_dirt = 0;
2234
2235 if (!(sb->s_flags & MS_RDONLY)) {
2236 journal_t *journal = EXT3_SB(sb)->s_journal;
2237
2238 /* Now we set up the journal barrier. */
2239 journal_lock_updates(journal);
2240 journal_flush(journal);
2241
2242 /* Journal blocked and flushed, clear needs_recovery flag. */
2243 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2244 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2245 }
2246}
2247
2248/*
2249 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2250 * flag here, even though the filesystem is not technically dirty yet.
2251 */
2252static void ext3_unlockfs(struct super_block *sb)
2253{
2254 if (!(sb->s_flags & MS_RDONLY)) {
2255 lock_super(sb);
2256 /* Reser the needs_recovery flag before the fs is unlocked. */
2257 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2258 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2259 unlock_super(sb);
2260 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2261 }
2262}
2263
2264static int ext3_remount (struct super_block * sb, int * flags, char * data)
2265{
2266 struct ext3_super_block * es;
2267 struct ext3_sb_info *sbi = EXT3_SB(sb);
2268 ext3_fsblk_t n_blocks_count = 0;
2269 unsigned long old_sb_flags;
2270 struct ext3_mount_options old_opts;
2271 int err;
2272#ifdef CONFIG_QUOTA
2273 int i;
2274#endif
2275
2276 /* Store the original options */
2277 old_sb_flags = sb->s_flags;
2278 old_opts.s_mount_opt = sbi->s_mount_opt;
2279 old_opts.s_resuid = sbi->s_resuid;
2280 old_opts.s_resgid = sbi->s_resgid;
2281 old_opts.s_commit_interval = sbi->s_commit_interval;
2282#ifdef CONFIG_QUOTA
2283 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2284 for (i = 0; i < MAXQUOTAS; i++)
2285 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2286#endif
2287
2288 /*
2289 * Allow the "check" option to be passed as a remount option.
2290 */
2291 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2292 err = -EINVAL;
2293 goto restore_opts;
2294 }
2295
2296 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2297 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2298
2299 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2300 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2301
2302 es = sbi->s_es;
2303
2304 ext3_init_journal_params(sb, sbi->s_journal);
2305
2306 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2307 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2308 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2309 err = -EROFS;
2310 goto restore_opts;
2311 }
2312
2313 if (*flags & MS_RDONLY) {
2314 /*
2315 * First of all, the unconditional stuff we have to do
2316 * to disable replay of the journal when we next remount
2317 */
2318 sb->s_flags |= MS_RDONLY;
2319
2320 /*
2321 * OK, test if we are remounting a valid rw partition
2322 * readonly, and if so set the rdonly flag and then
2323 * mark the partition as valid again.
2324 */
2325 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2326 (sbi->s_mount_state & EXT3_VALID_FS))
2327 es->s_state = cpu_to_le16(sbi->s_mount_state);
2328
2329 ext3_mark_recovery_complete(sb, es);
2330 } else {
2331 __le32 ret;
2332 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2333 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2334 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2335 "remount RDWR because of unsupported "
2336 "optional features (%x).\n",
2337 sb->s_id, le32_to_cpu(ret));
2338 err = -EROFS;
2339 goto restore_opts;
2340 }
2341 /*
2342 * Mounting a RDONLY partition read-write, so reread
2343 * and store the current valid flag. (It may have
2344 * been changed by e2fsck since we originally mounted
2345 * the partition.)
2346 */
2347 ext3_clear_journal_err(sb, es);
2348 sbi->s_mount_state = le16_to_cpu(es->s_state);
2349 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2350 goto restore_opts;
2351 if (!ext3_setup_super (sb, es, 0))
2352 sb->s_flags &= ~MS_RDONLY;
2353 }
2354 }
2355#ifdef CONFIG_QUOTA
2356 /* Release old quota file names */
2357 for (i = 0; i < MAXQUOTAS; i++)
2358 if (old_opts.s_qf_names[i] &&
2359 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2360 kfree(old_opts.s_qf_names[i]);
2361#endif
2362 return 0;
2363restore_opts:
2364 sb->s_flags = old_sb_flags;
2365 sbi->s_mount_opt = old_opts.s_mount_opt;
2366 sbi->s_resuid = old_opts.s_resuid;
2367 sbi->s_resgid = old_opts.s_resgid;
2368 sbi->s_commit_interval = old_opts.s_commit_interval;
2369#ifdef CONFIG_QUOTA
2370 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2371 for (i = 0; i < MAXQUOTAS; i++) {
2372 if (sbi->s_qf_names[i] &&
2373 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2374 kfree(sbi->s_qf_names[i]);
2375 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2376 }
2377#endif
2378 return err;
2379}
2380
2381static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2382{
2383 struct super_block *sb = dentry->d_sb;
2384 struct ext3_sb_info *sbi = EXT3_SB(sb);
2385 struct ext3_super_block *es = sbi->s_es;
2386 ext3_fsblk_t overhead;
2387 int i;
2388
2389 if (test_opt (sb, MINIX_DF))
2390 overhead = 0;
2391 else {
2392 unsigned long ngroups;
2393 ngroups = EXT3_SB(sb)->s_groups_count;
2394 smp_rmb();
2395
2396 /*
2397 * Compute the overhead (FS structures)
2398 */
2399
2400 /*
2401 * All of the blocks before first_data_block are
2402 * overhead
2403 */
2404 overhead = le32_to_cpu(es->s_first_data_block);
2405
2406 /*
2407 * Add the overhead attributed to the superblock and
2408 * block group descriptors. If the sparse superblocks
2409 * feature is turned on, then not all groups have this.
2410 */
2411 for (i = 0; i < ngroups; i++) {
2412 overhead += ext3_bg_has_super(sb, i) +
2413 ext3_bg_num_gdb(sb, i);
2414 cond_resched();
2415 }
2416
2417 /*
2418 * Every block group has an inode bitmap, a block
2419 * bitmap, and an inode table.
2420 */
2421 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2422 }
2423
2424 buf->f_type = EXT3_SUPER_MAGIC;
2425 buf->f_bsize = sb->s_blocksize;
2426 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2427 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2428 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2429 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2430 buf->f_bavail = 0;
2431 buf->f_files = le32_to_cpu(es->s_inodes_count);
2432 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2433 buf->f_namelen = EXT3_NAME_LEN;
2434 return 0;
2435}
2436
2437/* Helper function for writing quotas on sync - we need to start transaction before quota file
2438 * is locked for write. Otherwise the are possible deadlocks:
2439 * Process 1 Process 2
2440 * ext3_create() quota_sync()
2441 * journal_start() write_dquot()
2442 * DQUOT_INIT() down(dqio_mutex)
2443 * down(dqio_mutex) journal_start()
2444 *
2445 */
2446
2447#ifdef CONFIG_QUOTA
2448
2449static inline struct inode *dquot_to_inode(struct dquot *dquot)
2450{
2451 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2452}
2453
2454static int ext3_dquot_initialize(struct inode *inode, int type)
2455{
2456 handle_t *handle;
2457 int ret, err;
2458
2459 /* We may create quota structure so we need to reserve enough blocks */
2460 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2461 if (IS_ERR(handle))
2462 return PTR_ERR(handle);
2463 ret = dquot_initialize(inode, type);
2464 err = ext3_journal_stop(handle);
2465 if (!ret)
2466 ret = err;
2467 return ret;
2468}
2469
2470static int ext3_dquot_drop(struct inode *inode)
2471{
2472 handle_t *handle;
2473 int ret, err;
2474
2475 /* We may delete quota structure so we need to reserve enough blocks */
2476 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2477 if (IS_ERR(handle))
2478 return PTR_ERR(handle);
2479 ret = dquot_drop(inode);
2480 err = ext3_journal_stop(handle);
2481 if (!ret)
2482 ret = err;
2483 return ret;
2484}
2485
2486static int ext3_write_dquot(struct dquot *dquot)
2487{
2488 int ret, err;
2489 handle_t *handle;
2490 struct inode *inode;
2491
2492 inode = dquot_to_inode(dquot);
2493 handle = ext3_journal_start(inode,
2494 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2495 if (IS_ERR(handle))
2496 return PTR_ERR(handle);
2497 ret = dquot_commit(dquot);
2498 err = ext3_journal_stop(handle);
2499 if (!ret)
2500 ret = err;
2501 return ret;
2502}
2503
2504static int ext3_acquire_dquot(struct dquot *dquot)
2505{
2506 int ret, err;
2507 handle_t *handle;
2508
2509 handle = ext3_journal_start(dquot_to_inode(dquot),
2510 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2511 if (IS_ERR(handle))
2512 return PTR_ERR(handle);
2513 ret = dquot_acquire(dquot);
2514 err = ext3_journal_stop(handle);
2515 if (!ret)
2516 ret = err;
2517 return ret;
2518}
2519
2520static int ext3_release_dquot(struct dquot *dquot)
2521{
2522 int ret, err;
2523 handle_t *handle;
2524
2525 handle = ext3_journal_start(dquot_to_inode(dquot),
2526 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2527 if (IS_ERR(handle))
2528 return PTR_ERR(handle);
2529 ret = dquot_release(dquot);
2530 err = ext3_journal_stop(handle);
2531 if (!ret)
2532 ret = err;
2533 return ret;
2534}
2535
2536static int ext3_mark_dquot_dirty(struct dquot *dquot)
2537{
2538 /* Are we journalling quotas? */
2539 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2540 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2541 dquot_mark_dquot_dirty(dquot);
2542 return ext3_write_dquot(dquot);
2543 } else {
2544 return dquot_mark_dquot_dirty(dquot);
2545 }
2546}
2547
2548static int ext3_write_info(struct super_block *sb, int type)
2549{
2550 int ret, err;
2551 handle_t *handle;
2552
2553 /* Data block + inode block */
2554 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2555 if (IS_ERR(handle))
2556 return PTR_ERR(handle);
2557 ret = dquot_commit_info(sb, type);
2558 err = ext3_journal_stop(handle);
2559 if (!ret)
2560 ret = err;
2561 return ret;
2562}
2563
2564/*
2565 * Turn on quotas during mount time - we need to find
2566 * the quota file and such...
2567 */
2568static int ext3_quota_on_mount(struct super_block *sb, int type)
2569{
2570 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2571 EXT3_SB(sb)->s_jquota_fmt, type);
2572}
2573
2574/*
2575 * Standard function to be called on quota_on
2576 */
2577static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2578 char *path)
2579{
2580 int err;
2581 struct nameidata nd;
2582
2583 if (!test_opt(sb, QUOTA))
2584 return -EINVAL;
2585 /* Not journalling quota? */
2586 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2587 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2588 return vfs_quota_on(sb, type, format_id, path);
2589 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2590 if (err)
2591 return err;
2592 /* Quotafile not on the same filesystem? */
2593 if (nd.mnt->mnt_sb != sb) {
2594 path_release(&nd);
2595 return -EXDEV;
2596 }
2597 /* Quotafile not of fs root? */
2598 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2599 printk(KERN_WARNING
2600 "EXT3-fs: Quota file not on filesystem root. "
2601 "Journalled quota will not work.\n");
2602 path_release(&nd);
2603 return vfs_quota_on(sb, type, format_id, path);
2604}
2605
2606/* Read data from quotafile - avoid pagecache and such because we cannot afford
2607 * acquiring the locks... As quota files are never truncated and quota code
2608 * itself serializes the operations (and noone else should touch the files)
2609 * we don't have to be afraid of races */
2610static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2611 size_t len, loff_t off)
2612{
2613 struct inode *inode = sb_dqopt(sb)->files[type];
2614 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2615 int err = 0;
2616 int offset = off & (sb->s_blocksize - 1);
2617 int tocopy;
2618 size_t toread;
2619 struct buffer_head *bh;
2620 loff_t i_size = i_size_read(inode);
2621
2622 if (off > i_size)
2623 return 0;
2624 if (off+len > i_size)
2625 len = i_size-off;
2626 toread = len;
2627 while (toread > 0) {
2628 tocopy = sb->s_blocksize - offset < toread ?
2629 sb->s_blocksize - offset : toread;
2630 bh = ext3_bread(NULL, inode, blk, 0, &err);
2631 if (err)
2632 return err;
2633 if (!bh) /* A hole? */
2634 memset(data, 0, tocopy);
2635 else
2636 memcpy(data, bh->b_data+offset, tocopy);
2637 brelse(bh);
2638 offset = 0;
2639 toread -= tocopy;
2640 data += tocopy;
2641 blk++;
2642 }
2643 return len;
2644}
2645
2646/* Write to quotafile (we know the transaction is already started and has
2647 * enough credits) */
2648static ssize_t ext3_quota_write(struct super_block *sb, int type,
2649 const char *data, size_t len, loff_t off)
2650{
2651 struct inode *inode = sb_dqopt(sb)->files[type];
2652 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2653 int err = 0;
2654 int offset = off & (sb->s_blocksize - 1);
2655 int tocopy;
2656 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2657 size_t towrite = len;
2658 struct buffer_head *bh;
2659 handle_t *handle = journal_current_handle();
2660
2661 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2662 while (towrite > 0) {
2663 tocopy = sb->s_blocksize - offset < towrite ?
2664 sb->s_blocksize - offset : towrite;
2665 bh = ext3_bread(handle, inode, blk, 1, &err);
2666 if (!bh)
2667 goto out;
2668 if (journal_quota) {
2669 err = ext3_journal_get_write_access(handle, bh);
2670 if (err) {
2671 brelse(bh);
2672 goto out;
2673 }
2674 }
2675 lock_buffer(bh);
2676 memcpy(bh->b_data+offset, data, tocopy);
2677 flush_dcache_page(bh->b_page);
2678 unlock_buffer(bh);
2679 if (journal_quota)
2680 err = ext3_journal_dirty_metadata(handle, bh);
2681 else {
2682 /* Always do at least ordered writes for quotas */
2683 err = ext3_journal_dirty_data(handle, bh);
2684 mark_buffer_dirty(bh);
2685 }
2686 brelse(bh);
2687 if (err)
2688 goto out;
2689 offset = 0;
2690 towrite -= tocopy;
2691 data += tocopy;
2692 blk++;
2693 }
2694out:
2695 if (len == towrite)
2696 return err;
2697 if (inode->i_size < off+len-towrite) {
2698 i_size_write(inode, off+len-towrite);
2699 EXT3_I(inode)->i_disksize = inode->i_size;
2700 }
2701 inode->i_version++;
2702 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2703 ext3_mark_inode_dirty(handle, inode);
2704 mutex_unlock(&inode->i_mutex);
2705 return len - towrite;
2706}
2707
2708#endif
2709
2710static int ext3_get_sb(struct file_system_type *fs_type,
2711 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2712{
2713 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2714}
2715
2716static struct file_system_type ext3_fs_type = {
2717 .owner = THIS_MODULE,
2718 .name = "ext3",
2719 .get_sb = ext3_get_sb,
2720 .kill_sb = kill_block_super,
2721 .fs_flags = FS_REQUIRES_DEV,
2722};
2723
2724static int __init init_ext3_fs(void)
2725{
2726 int err = init_ext3_xattr();
2727 if (err)
2728 return err;
2729 err = init_inodecache();
2730 if (err)
2731 goto out1;
2732 err = register_filesystem(&ext3_fs_type);
2733 if (err)
2734 goto out;
2735 return 0;
2736out:
2737 destroy_inodecache();
2738out1:
2739 exit_ext3_xattr();
2740 return err;
2741}
2742
2743static void __exit exit_ext3_fs(void)
2744{
2745 unregister_filesystem(&ext3_fs_type);
2746 destroy_inodecache();
2747 exit_ext3_xattr();
2748}
2749
2750MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2751MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2752MODULE_LICENSE("GPL");
2753module_init(init_ext3_fs)
2754module_exit(exit_ext3_fs)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 00:59:02 -0500