2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
4 * Trivial changes by Alan Cox to add the LFS fixes
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <asm/uaccess.h>
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/exportfs.h>
26 #include <linux/quotaops.h>
27 #include <linux/vfs.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.h>
31 #include <linux/seq_file.h>
33 struct file_system_type reiserfs_fs_type;
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
41 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42 strlen(reiserfs_3_5_magic_string));
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
47 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48 strlen(reiserfs_3_6_magic_string));
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
53 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54 strlen(reiserfs_jr_magic_string));
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
59 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65 void show_alloc_options(struct seq_file *seq, struct super_block *s);
67 static int reiserfs_sync_fs(struct super_block *s, int wait)
69 struct reiserfs_transaction_handle th;
72 * Writeback quota in non-journalled quota case - journalled quota has
75 dquot_writeback_dquots(s, -1);
76 reiserfs_write_lock(s);
77 if (!journal_begin(&th, s, 1))
78 if (!journal_end_sync(&th, s, 1))
79 reiserfs_flush_old_commits(s);
80 reiserfs_write_unlock(s);
84 static void flush_old_commits(struct work_struct *work)
86 struct reiserfs_sb_info *sbi;
87 struct super_block *s;
89 sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
90 s = sbi->s_journal->j_work_sb;
92 spin_lock(&sbi->old_work_lock);
94 spin_unlock(&sbi->old_work_lock);
96 reiserfs_sync_fs(s, 1);
99 void reiserfs_schedule_old_flush(struct super_block *s)
101 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
104 if (s->s_flags & MS_RDONLY)
107 spin_lock(&sbi->old_work_lock);
108 if (!sbi->work_queued) {
109 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
110 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
111 sbi->work_queued = 1;
113 spin_unlock(&sbi->old_work_lock);
116 static void cancel_old_flush(struct super_block *s)
118 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
120 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
121 spin_lock(&sbi->old_work_lock);
122 sbi->work_queued = 0;
123 spin_unlock(&sbi->old_work_lock);
126 static int reiserfs_freeze(struct super_block *s)
128 struct reiserfs_transaction_handle th;
132 reiserfs_write_lock(s);
133 if (!(s->s_flags & MS_RDONLY)) {
134 int err = journal_begin(&th, s, 1);
136 reiserfs_block_writes(&th);
138 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
140 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
141 reiserfs_block_writes(&th);
142 journal_end_sync(&th, s, 1);
145 reiserfs_write_unlock(s);
149 static int reiserfs_unfreeze(struct super_block *s)
151 reiserfs_allow_writes(s);
155 extern const struct in_core_key MAX_IN_CORE_KEY;
157 /* this is used to delete "save link" when there are no items of a
158 file it points to. It can either happen if unlink is completed but
159 "save unlink" removal, or if file has both unlink and truncate
160 pending and as unlink completes first (because key of "save link"
161 protecting unlink is bigger that a key lf "save link" which
162 protects truncate), so there left no items to make truncate
164 static int remove_save_link_only(struct super_block *s,
165 struct reiserfs_key *key, int oid_free)
167 struct reiserfs_transaction_handle th;
170 /* we are going to do one balancing */
171 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
175 reiserfs_delete_solid_item(&th, NULL, key);
177 /* removals are protected by direct items */
178 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
180 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
184 static int reiserfs_quota_on_mount(struct super_block *, int);
187 /* look for uncompleted unlinks and truncates and complete them */
188 static int finish_unfinished(struct super_block *s)
190 INITIALIZE_PATH(path);
191 struct cpu_key max_cpu_key, obj_key;
192 struct reiserfs_key save_link_key, last_inode_key;
194 struct item_head *ih;
195 struct buffer_head *bh;
204 int quota_enabled[MAXQUOTAS];
207 /* compose key to look for "save" links */
208 max_cpu_key.version = KEY_FORMAT_3_5;
209 max_cpu_key.on_disk_key.k_dir_id = ~0U;
210 max_cpu_key.on_disk_key.k_objectid = ~0U;
211 set_cpu_key_k_offset(&max_cpu_key, ~0U);
212 max_cpu_key.key_length = 3;
214 memset(&last_inode_key, 0, sizeof(last_inode_key));
217 /* Needed for iput() to work correctly and not trash data */
218 if (s->s_flags & MS_ACTIVE) {
222 s->s_flags |= MS_ACTIVE;
224 /* Turn on quotas so that they are updated correctly */
225 for (i = 0; i < MAXQUOTAS; i++) {
226 quota_enabled[i] = 1;
227 if (REISERFS_SB(s)->s_qf_names[i]) {
230 if (sb_has_quota_active(s, i)) {
231 quota_enabled[i] = 0;
234 ret = reiserfs_quota_on_mount(s, i);
236 reiserfs_warning(s, "reiserfs-2500",
237 "cannot turn on journaled "
238 "quota: error %d", ret);
244 REISERFS_SB(s)->s_is_unlinked_ok = 1;
246 retval = search_item(s, &max_cpu_key, &path);
247 if (retval != ITEM_NOT_FOUND) {
248 reiserfs_error(s, "vs-2140",
249 "search_by_key returned %d", retval);
253 bh = get_last_bh(&path);
254 item_pos = get_item_pos(&path);
255 if (item_pos != B_NR_ITEMS(bh)) {
256 reiserfs_warning(s, "vs-2060",
257 "wrong position found");
261 ih = B_N_PITEM_HEAD(bh, item_pos);
263 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
264 /* there are no "save" links anymore */
267 save_link_key = ih->ih_key;
268 if (is_indirect_le_ih(ih))
273 /* reiserfs_iget needs k_dirid and k_objectid only */
274 item = B_I_PITEM(bh, ih);
275 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
276 obj_key.on_disk_key.k_objectid =
277 le32_to_cpu(ih->ih_key.k_objectid);
278 obj_key.on_disk_key.k_offset = 0;
279 obj_key.on_disk_key.k_type = 0;
283 inode = reiserfs_iget(s, &obj_key);
285 /* the unlink almost completed, it just did not manage to remove
286 "save" link and release objectid */
287 reiserfs_warning(s, "vs-2180", "iget failed for %K",
289 retval = remove_save_link_only(s, &save_link_key, 1);
293 if (!truncate && inode->i_nlink) {
294 /* file is not unlinked */
295 reiserfs_warning(s, "vs-2185",
296 "file %K is not unlinked",
298 retval = remove_save_link_only(s, &save_link_key, 0);
301 dquot_initialize(inode);
303 if (truncate && S_ISDIR(inode->i_mode)) {
304 /* We got a truncate request for a dir which is impossible.
305 The only imaginable way is to execute unfinished truncate request
306 then boot into old kernel, remove the file and create dir with
308 reiserfs_warning(s, "green-2101",
309 "impossible truncate on a "
310 "directory %k. Please report",
312 retval = remove_save_link_only(s, &save_link_key, 0);
319 REISERFS_I(inode)->i_flags |=
320 i_link_saved_truncate_mask;
321 /* not completed truncate found. New size was committed together
323 reiserfs_info(s, "Truncating %k to %Ld ..",
324 INODE_PKEY(inode), inode->i_size);
325 reiserfs_truncate_file(inode,
327 /*don't update modification time */
329 retval = remove_save_link(inode, truncate);
331 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
332 /* not completed unlink (rmdir) found */
333 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
334 if (memcmp(&last_inode_key, INODE_PKEY(inode),
335 sizeof(last_inode_key))){
336 last_inode_key = *INODE_PKEY(inode);
337 /* removal gets completed in iput */
340 reiserfs_warning(s, "super-2189", "Dead loop "
341 "in finish_unfinished "
342 "detected, just remove "
344 retval = remove_save_link_only(s,
353 REISERFS_SB(s)->s_is_unlinked_ok = 0;
356 /* Turn quotas off */
357 for (i = 0; i < MAXQUOTAS; i++) {
358 if (sb_dqopt(s)->files[i] && quota_enabled[i])
359 dquot_quota_off(s, i);
362 /* Restore the flag back */
363 s->s_flags &= ~MS_ACTIVE;
367 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
368 "Completed\n", done);
372 /* to protect file being unlinked from getting lost we "safe" link files
373 being unlinked. This link will be deleted in the same transaction with last
374 item of file. mounting the filesystem we scan all these links and remove
375 files which almost got lost */
376 void add_save_link(struct reiserfs_transaction_handle *th,
377 struct inode *inode, int truncate)
379 INITIALIZE_PATH(path);
385 BUG_ON(!th->t_trans_id);
387 /* file can only get one "save link" of each kind */
389 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
390 "saved link already exists for truncated inode %lx",
393 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
394 "saved link already exists for unlinked inode %lx",
397 /* setup key of "save" link */
398 key.version = KEY_FORMAT_3_5;
399 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
400 key.on_disk_key.k_objectid = inode->i_ino;
402 /* unlink, rmdir, rename */
403 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
404 set_cpu_key_k_type(&key, TYPE_DIRECT);
406 /* item head of "safe" link */
407 make_le_item_head(&ih, &key, key.version,
408 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
409 4 /*length */ , 0xffff /*free space */ );
412 if (S_ISDIR(inode->i_mode))
413 reiserfs_warning(inode->i_sb, "green-2102",
414 "Adding a truncate savelink for "
415 "a directory %k! Please report",
417 set_cpu_key_k_offset(&key, 1);
418 set_cpu_key_k_type(&key, TYPE_INDIRECT);
420 /* item head of "safe" link */
421 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
422 4 /*length */ , 0 /*free space */ );
426 /* look for its place in the tree */
427 retval = search_item(inode->i_sb, &key, &path);
428 if (retval != ITEM_NOT_FOUND) {
429 if (retval != -ENOSPC)
430 reiserfs_error(inode->i_sb, "vs-2100",
431 "search_by_key (%K) returned %d", &key,
437 /* body of "save" link */
438 link = INODE_PKEY(inode)->k_dir_id;
440 /* put "save" link into tree, don't charge quota to anyone */
442 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
444 if (retval != -ENOSPC)
445 reiserfs_error(inode->i_sb, "vs-2120",
446 "insert_item returned %d", retval);
449 REISERFS_I(inode)->i_flags |=
450 i_link_saved_truncate_mask;
452 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
456 /* this opens transaction unlike add_save_link */
457 int remove_save_link(struct inode *inode, int truncate)
459 struct reiserfs_transaction_handle th;
460 struct reiserfs_key key;
463 /* we are going to do one balancing only */
464 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
468 /* setup key of "save" link */
469 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
470 key.k_objectid = INODE_PKEY(inode)->k_objectid;
472 /* unlink, rmdir, rename */
473 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
474 1 + inode->i_sb->s_blocksize);
475 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
478 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
479 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
483 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
485 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
486 /* don't take quota bytes from anywhere */
487 reiserfs_delete_solid_item(&th, NULL, &key);
489 reiserfs_release_objectid(&th, inode->i_ino);
490 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
492 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
494 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
497 static void reiserfs_kill_sb(struct super_block *s)
499 if (REISERFS_SB(s)) {
501 * Force any pending inode evictions to occur now. Any
502 * inodes to be removed that have extended attributes
503 * associated with them need to clean them up before
504 * we can release the extended attribute root dentries.
505 * shrink_dcache_for_umount will BUG if we don't release
506 * those before it's called so ->put_super is too late.
510 dput(REISERFS_SB(s)->xattr_root);
511 REISERFS_SB(s)->xattr_root = NULL;
512 dput(REISERFS_SB(s)->priv_root);
513 REISERFS_SB(s)->priv_root = NULL;
519 static void reiserfs_put_super(struct super_block *s)
521 struct reiserfs_transaction_handle th;
524 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
526 reiserfs_write_lock(s);
528 /* change file system state to current state if it was mounted with read-write permissions */
529 if (!(s->s_flags & MS_RDONLY)) {
530 if (!journal_begin(&th, s, 10)) {
531 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
533 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
534 REISERFS_SB(s)->s_mount_state);
535 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
539 /* note, journal_release checks for readonly mount, and can decide not
540 ** to do a journal_end
542 journal_release(&th, s);
544 reiserfs_free_bitmap_cache(s);
546 brelse(SB_BUFFER_WITH_SB(s));
550 if (REISERFS_SB(s)->reserved_blocks != 0) {
551 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
552 REISERFS_SB(s)->reserved_blocks);
555 reiserfs_proc_info_done(s);
557 reiserfs_write_unlock(s);
558 mutex_destroy(&REISERFS_SB(s)->lock);
563 static struct kmem_cache *reiserfs_inode_cachep;
565 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
567 struct reiserfs_inode_info *ei;
568 ei = (struct reiserfs_inode_info *)
569 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
572 atomic_set(&ei->openers, 0);
573 mutex_init(&ei->tailpack);
574 return &ei->vfs_inode;
577 static void reiserfs_i_callback(struct rcu_head *head)
579 struct inode *inode = container_of(head, struct inode, i_rcu);
580 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
583 static void reiserfs_destroy_inode(struct inode *inode)
585 call_rcu(&inode->i_rcu, reiserfs_i_callback);
588 static void init_once(void *foo)
590 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
592 INIT_LIST_HEAD(&ei->i_prealloc_list);
593 inode_init_once(&ei->vfs_inode);
596 static int init_inodecache(void)
598 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
600 reiserfs_inode_info),
601 0, (SLAB_RECLAIM_ACCOUNT|
604 if (reiserfs_inode_cachep == NULL)
609 static void destroy_inodecache(void)
612 * Make sure all delayed rcu free inodes are flushed before we
616 kmem_cache_destroy(reiserfs_inode_cachep);
619 /* we don't mark inodes dirty, we just log them */
620 static void reiserfs_dirty_inode(struct inode *inode, int flags)
622 struct reiserfs_transaction_handle th;
627 if (inode->i_sb->s_flags & MS_RDONLY) {
628 reiserfs_warning(inode->i_sb, "clm-6006",
629 "writing inode %lu on readonly FS",
633 lock_depth = reiserfs_write_lock_once(inode->i_sb);
635 /* this is really only used for atime updates, so they don't have
636 ** to be included in O_SYNC or fsync
638 err = journal_begin(&th, inode->i_sb, 1);
642 reiserfs_update_sd(&th, inode);
643 journal_end(&th, inode->i_sb, 1);
646 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
649 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
651 struct super_block *s = root->d_sb;
652 struct reiserfs_journal *journal = SB_JOURNAL(s);
653 long opts = REISERFS_SB(s)->s_mount_opt;
655 if (opts & (1 << REISERFS_LARGETAIL))
656 seq_puts(seq, ",tails=on");
657 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
658 seq_puts(seq, ",notail");
659 /* tails=small is default so we don't show it */
661 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
662 seq_puts(seq, ",barrier=none");
663 /* barrier=flush is default so we don't show it */
665 if (opts & (1 << REISERFS_ERROR_CONTINUE))
666 seq_puts(seq, ",errors=continue");
667 else if (opts & (1 << REISERFS_ERROR_PANIC))
668 seq_puts(seq, ",errors=panic");
669 /* errors=ro is default so we don't show it */
671 if (opts & (1 << REISERFS_DATA_LOG))
672 seq_puts(seq, ",data=journal");
673 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
674 seq_puts(seq, ",data=writeback");
675 /* data=ordered is default so we don't show it */
677 if (opts & (1 << REISERFS_ATTRS))
678 seq_puts(seq, ",attrs");
680 if (opts & (1 << REISERFS_XATTRS_USER))
681 seq_puts(seq, ",user_xattr");
683 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
684 seq_puts(seq, ",expose_privroot");
686 if (opts & (1 << REISERFS_POSIXACL))
687 seq_puts(seq, ",acl");
689 if (REISERFS_SB(s)->s_jdev)
690 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
692 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
693 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
696 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
697 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
698 else if (opts & (1 << REISERFS_USRQUOTA))
699 seq_puts(seq, ",usrquota");
700 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
701 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
702 else if (opts & (1 << REISERFS_GRPQUOTA))
703 seq_puts(seq, ",grpquota");
704 if (REISERFS_SB(s)->s_jquota_fmt) {
705 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
706 seq_puts(seq, ",jqfmt=vfsold");
707 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
708 seq_puts(seq, ",jqfmt=vfsv0");
712 /* Block allocator options */
713 if (opts & (1 << REISERFS_NO_BORDER))
714 seq_puts(seq, ",block-allocator=noborder");
715 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
716 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
717 if (opts & (1 << REISERFS_HASHED_RELOCATION))
718 seq_puts(seq, ",block-allocator=hashed_relocation");
719 if (opts & (1 << REISERFS_TEST4))
720 seq_puts(seq, ",block-allocator=test4");
721 show_alloc_options(seq, s);
726 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
728 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
732 static const struct super_operations reiserfs_sops = {
733 .alloc_inode = reiserfs_alloc_inode,
734 .destroy_inode = reiserfs_destroy_inode,
735 .write_inode = reiserfs_write_inode,
736 .dirty_inode = reiserfs_dirty_inode,
737 .evict_inode = reiserfs_evict_inode,
738 .put_super = reiserfs_put_super,
739 .sync_fs = reiserfs_sync_fs,
740 .freeze_fs = reiserfs_freeze,
741 .unfreeze_fs = reiserfs_unfreeze,
742 .statfs = reiserfs_statfs,
743 .remount_fs = reiserfs_remount,
744 .show_options = reiserfs_show_options,
746 .quota_read = reiserfs_quota_read,
747 .quota_write = reiserfs_quota_write,
752 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
754 static int reiserfs_write_dquot(struct dquot *);
755 static int reiserfs_acquire_dquot(struct dquot *);
756 static int reiserfs_release_dquot(struct dquot *);
757 static int reiserfs_mark_dquot_dirty(struct dquot *);
758 static int reiserfs_write_info(struct super_block *, int);
759 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
761 static const struct dquot_operations reiserfs_quota_operations = {
762 .write_dquot = reiserfs_write_dquot,
763 .acquire_dquot = reiserfs_acquire_dquot,
764 .release_dquot = reiserfs_release_dquot,
765 .mark_dirty = reiserfs_mark_dquot_dirty,
766 .write_info = reiserfs_write_info,
767 .alloc_dquot = dquot_alloc,
768 .destroy_dquot = dquot_destroy,
771 static const struct quotactl_ops reiserfs_qctl_operations = {
772 .quota_on = reiserfs_quota_on,
773 .quota_off = dquot_quota_off,
774 .quota_sync = dquot_quota_sync,
775 .get_info = dquot_get_dqinfo,
776 .set_info = dquot_set_dqinfo,
777 .get_dqblk = dquot_get_dqblk,
778 .set_dqblk = dquot_set_dqblk,
782 static const struct export_operations reiserfs_export_ops = {
783 .encode_fh = reiserfs_encode_fh,
784 .fh_to_dentry = reiserfs_fh_to_dentry,
785 .fh_to_parent = reiserfs_fh_to_parent,
786 .get_parent = reiserfs_get_parent,
789 /* this struct is used in reiserfs_getopt () for containing the value for those
790 mount options that have values rather than being toggles. */
793 int setmask; /* bitmask which is to set on mount_options bitmask when this
794 value is found, 0 is no bits are to be changed. */
795 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
796 value is found, 0 is no bits are to be changed. This is
797 applied BEFORE setmask */
800 /* Set this bit in arg_required to allow empty arguments */
801 #define REISERFS_OPT_ALLOWEMPTY 31
803 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
807 int arg_required; /* 0 if argument is not required, not 0 otherwise */
808 const arg_desc_t *values; /* list of values accepted by an option */
809 int setmask; /* bitmask which is to set on mount_options bitmask when this
810 value is found, 0 is no bits are to be changed. */
811 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
812 value is found, 0 is no bits are to be changed. This is
813 applied BEFORE setmask */
816 /* possible values for -o data= */
817 static const arg_desc_t logging_mode[] = {
818 {"ordered", 1 << REISERFS_DATA_ORDERED,
819 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
820 {"journal", 1 << REISERFS_DATA_LOG,
821 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
822 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
823 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
827 /* possible values for -o barrier= */
828 static const arg_desc_t barrier_mode[] = {
829 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
830 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
834 /* possible values for "-o block-allocator=" and bits which are to be set in
835 s_mount_opt of reiserfs specific part of in-core super block */
836 static const arg_desc_t balloc[] = {
837 {"noborder", 1 << REISERFS_NO_BORDER, 0},
838 {"border", 0, 1 << REISERFS_NO_BORDER},
839 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
840 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
841 {"test4", 1 << REISERFS_TEST4, 0},
842 {"notest4", 0, 1 << REISERFS_TEST4},
846 static const arg_desc_t tails[] = {
847 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
848 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
849 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
853 static const arg_desc_t error_actions[] = {
854 {"panic", 1 << REISERFS_ERROR_PANIC,
855 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
856 {"ro-remount", 1 << REISERFS_ERROR_RO,
857 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
858 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
859 {"continue", 1 << REISERFS_ERROR_CONTINUE,
860 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
865 /* proceed only one option from a list *cur - string containing of mount options
866 opts - array of options which are accepted
867 opt_arg - if option is found and requires an argument and if it is specifed
868 in the input - pointer to the argument is stored here
869 bit_flags - if option requires to set a certain bit - it is set here
870 return -1 if unknown option is found, opt->arg_required otherwise */
871 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
872 char **opt_arg, unsigned long *bit_flags)
881 const opt_desc_t *opt;
882 const arg_desc_t *arg;
886 /* assume argument cannot contain commas */
887 *cur = strchr(p, ',');
893 if (!strncmp(p, "alloc=", 6)) {
894 /* Ugly special case, probably we should redo options parser so that
895 it can understand several arguments for some options, also so that
896 it can fill several bitfields with option values. */
897 if (reiserfs_parse_alloc_options(s, p + 6)) {
904 /* for every option in the list */
905 for (opt = opts; opt->option_name; opt++) {
906 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
909 (1 << REISERFS_UNSUPPORTED_OPT))
910 reiserfs_warning(s, "super-6500",
911 "%s not supported.\n",
914 *bit_flags &= ~opt->clrmask;
916 (1 << REISERFS_UNSUPPORTED_OPT))
917 reiserfs_warning(s, "super-6501",
918 "%s not supported.\n",
921 *bit_flags |= opt->setmask;
926 if (!opt->option_name) {
927 reiserfs_warning(s, "super-6502",
928 "unknown mount option \"%s\"", p);
932 p += strlen(opt->option_name);
935 if (!opt->arg_required) {
936 reiserfs_warning(s, "super-6503",
937 "the option \"%s\" does not "
938 "require an argument\n",
945 if (opt->arg_required) {
946 reiserfs_warning(s, "super-6504",
947 "the option \"%s\" requires an "
948 "argument\n", opt->option_name);
953 reiserfs_warning(s, "super-6505",
954 "head of option \"%s\" is only correct\n",
959 /* move to the argument, or to next option if argument is not required */
962 if (opt->arg_required
963 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
965 /* this catches "option=," if not allowed */
966 reiserfs_warning(s, "super-6506",
967 "empty argument for \"%s\"\n",
973 /* *=NULLopt_arg contains pointer to argument */
975 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
978 /* values possible for this option are listed in opt->values */
979 for (arg = opt->values; arg->value; arg++) {
980 if (!strcmp(p, arg->value)) {
982 *bit_flags &= ~arg->clrmask;
983 *bit_flags |= arg->setmask;
985 return opt->arg_required;
989 reiserfs_warning(s, "super-6506",
990 "bad value \"%s\" for option \"%s\"\n", p,
995 /* returns 0 if something is wrong in option string, 1 - otherwise */
996 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
997 unsigned long *mount_options,
998 /* after the parsing phase, contains the
999 collection of bitflags defining what
1000 mount options were selected. */
1001 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
1003 unsigned int *commit_max_age,
1010 opt_desc_t opts[] = {
1011 /* Compatibility stuff, so that -o notail for old setups still work */
1012 {"tails",.arg_required = 't',.values = tails},
1013 {"notail",.clrmask =
1014 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1015 {"conv",.setmask = 1 << REISERFS_CONVERT},
1016 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1017 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1018 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1019 #ifdef CONFIG_REISERFS_FS_XATTR
1020 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1021 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1023 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1024 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1027 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1028 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1030 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1031 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033 {.option_name = "nolog"},
1034 {"replayonly",.setmask = 1 << REPLAYONLY},
1035 {"block-allocator",.arg_required = 'a',.values = balloc},
1036 {"data",.arg_required = 'd',.values = logging_mode},
1037 {"barrier",.arg_required = 'b',.values = barrier_mode},
1038 {"resize",.arg_required = 'r',.values = NULL},
1039 {"jdev",.arg_required = 'j',.values = NULL},
1040 {"nolargeio",.arg_required = 'w',.values = NULL},
1041 {"commit",.arg_required = 'c',.values = NULL},
1042 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1043 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1044 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1045 {"errors",.arg_required = 'e',.values = error_actions},
1046 {"usrjquota",.arg_required =
1047 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1048 {"grpjquota",.arg_required =
1049 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050 {"jqfmt",.arg_required = 'f',.values = NULL},
1051 {.option_name = NULL}
1055 if (!options || !*options)
1056 /* use default configuration: create tails, journaling on, no
1057 conversion to newest format */
1060 for (pos = options; pos;) {
1061 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1063 /* wrong option is given */
1070 /* "resize=NNN" or "resize=auto" */
1072 if (!strcmp(arg, "auto")) {
1073 /* From JFS code, to auto-get the size. */
1075 s->s_bdev->bd_inode->i_size >> s->
1078 *blocks = simple_strtoul(arg, &p, 0);
1080 /* NNN does not look like a number */
1081 reiserfs_warning(s, "super-6507",
1091 unsigned long val = simple_strtoul(arg, &p, 0);
1092 /* commit=NNN (time in seconds) */
1093 if (*p != '\0' || val >= (unsigned int)-1) {
1094 reiserfs_warning(s, "super-6508",
1095 "bad value %s for -ocommit\n",
1099 *commit_max_age = (unsigned int)val;
1103 reiserfs_warning(s, "super-6509", "nolargeio option "
1104 "is no longer supported");
1109 if (arg && *arg && jdev_name) {
1110 if (*jdev_name) { //Hm, already assigned?
1111 reiserfs_warning(s, "super-6510",
1112 "journal device was "
1113 "already specified to "
1114 "be %s", *jdev_name);
1121 if (c == 'u' || c == 'g') {
1122 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1124 if (sb_any_quota_loaded(s) &&
1125 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1126 reiserfs_warning(s, "super-6511",
1127 "cannot change journaled "
1128 "quota options when quota "
1132 if (*arg) { /* Some filename specified? */
1133 if (REISERFS_SB(s)->s_qf_names[qtype]
1134 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1136 reiserfs_warning(s, "super-6512",
1138 "already specified.",
1142 if (strchr(arg, '/')) {
1143 reiserfs_warning(s, "super-6513",
1144 "quotafile must be "
1145 "on filesystem root.");
1149 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1150 if (!qf_names[qtype]) {
1151 reiserfs_warning(s, "reiserfs-2502",
1152 "not enough memory "
1157 strcpy(qf_names[qtype], arg);
1158 if (qtype == USRQUOTA)
1159 *mount_options |= 1 << REISERFS_USRQUOTA;
1161 *mount_options |= 1 << REISERFS_GRPQUOTA;
1163 if (qf_names[qtype] !=
1164 REISERFS_SB(s)->s_qf_names[qtype])
1165 kfree(qf_names[qtype]);
1166 qf_names[qtype] = NULL;
1167 if (qtype == USRQUOTA)
1168 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1170 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1174 if (!strcmp(arg, "vfsold"))
1175 *qfmt = QFMT_VFS_OLD;
1176 else if (!strcmp(arg, "vfsv0"))
1177 *qfmt = QFMT_VFS_V0;
1179 reiserfs_warning(s, "super-6514",
1180 "unknown quota format "
1184 if (sb_any_quota_loaded(s) &&
1185 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1186 reiserfs_warning(s, "super-6515",
1187 "cannot change journaled "
1188 "quota options when quota "
1194 if (c == 'u' || c == 'g' || c == 'f') {
1195 reiserfs_warning(s, "reiserfs-2503", "journaled "
1196 "quota options not supported.");
1203 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1204 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1205 reiserfs_warning(s, "super-6515",
1206 "journaled quota format not specified.");
1209 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1210 sb_has_quota_loaded(s, USRQUOTA)) ||
1211 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1212 sb_has_quota_loaded(s, GRPQUOTA))) {
1213 reiserfs_warning(s, "super-6516", "quota options must "
1214 "be present when quota is turned on.");
1222 static void switch_data_mode(struct super_block *s, unsigned long mode)
1224 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1225 (1 << REISERFS_DATA_ORDERED) |
1226 (1 << REISERFS_DATA_WRITEBACK));
1227 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1230 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1232 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1233 if (!reiserfs_data_log(s)) {
1234 switch_data_mode(s, REISERFS_DATA_LOG);
1235 reiserfs_info(s, "switching to journaled data mode\n");
1237 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1238 if (!reiserfs_data_ordered(s)) {
1239 switch_data_mode(s, REISERFS_DATA_ORDERED);
1240 reiserfs_info(s, "switching to ordered data mode\n");
1242 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1243 if (!reiserfs_data_writeback(s)) {
1244 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1245 reiserfs_info(s, "switching to writeback data mode\n");
1250 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1252 int flush = (1 << REISERFS_BARRIER_FLUSH);
1253 int none = (1 << REISERFS_BARRIER_NONE);
1254 int all_barrier = flush | none;
1256 if (bits & all_barrier) {
1257 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1259 REISERFS_SB(s)->s_mount_opt |= flush;
1260 printk("reiserfs: enabling write barrier flush mode\n");
1261 } else if (bits & none) {
1262 REISERFS_SB(s)->s_mount_opt |= none;
1263 printk("reiserfs: write barriers turned off\n");
1268 static void handle_attrs(struct super_block *s)
1270 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1272 if (reiserfs_attrs(s)) {
1273 if (old_format_only(s)) {
1274 reiserfs_warning(s, "super-6517", "cannot support "
1275 "attributes on 3.5.x disk format");
1276 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1279 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1280 reiserfs_warning(s, "super-6518", "cannot support "
1281 "attributes until flag is set in "
1283 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1289 static void handle_quota_files(struct super_block *s, char **qf_names,
1294 for (i = 0; i < MAXQUOTAS; i++) {
1295 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1296 kfree(REISERFS_SB(s)->s_qf_names[i]);
1297 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1300 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1304 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1306 struct reiserfs_super_block *rs;
1307 struct reiserfs_transaction_handle th;
1308 unsigned long blocks;
1309 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1310 unsigned long safe_mask = 0;
1311 unsigned int commit_max_age = (unsigned int)-1;
1312 struct reiserfs_journal *journal = SB_JOURNAL(s);
1313 char *new_opts = kstrdup(arg, GFP_KERNEL);
1315 char *qf_names[MAXQUOTAS];
1316 unsigned int qfmt = 0;
1321 reiserfs_write_lock(s);
1324 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1327 rs = SB_DISK_SUPER_BLOCK(s);
1329 if (!reiserfs_parse_options
1330 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1333 for (i = 0; i < MAXQUOTAS; i++)
1334 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1341 handle_quota_files(s, qf_names, &qfmt);
1346 /* Add options that are safe here */
1347 safe_mask |= 1 << REISERFS_SMALLTAIL;
1348 safe_mask |= 1 << REISERFS_LARGETAIL;
1349 safe_mask |= 1 << REISERFS_NO_BORDER;
1350 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1351 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1352 safe_mask |= 1 << REISERFS_TEST4;
1353 safe_mask |= 1 << REISERFS_ATTRS;
1354 safe_mask |= 1 << REISERFS_XATTRS_USER;
1355 safe_mask |= 1 << REISERFS_POSIXACL;
1356 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1357 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1358 safe_mask |= 1 << REISERFS_ERROR_RO;
1359 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1360 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1361 safe_mask |= 1 << REISERFS_USRQUOTA;
1362 safe_mask |= 1 << REISERFS_GRPQUOTA;
1364 /* Update the bitmask, taking care to keep
1365 * the bits we're not allowed to change here */
1366 REISERFS_SB(s)->s_mount_opt =
1368 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1370 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1371 journal->j_max_commit_age = commit_max_age;
1372 journal->j_max_trans_age = commit_max_age;
1373 } else if (commit_max_age == 0) {
1374 /* 0 means restore defaults. */
1375 journal->j_max_commit_age = journal->j_default_max_commit_age;
1376 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1380 err = reiserfs_resize(s, blocks);
1385 if (*mount_flags & MS_RDONLY) {
1386 reiserfs_xattr_init(s, *mount_flags);
1387 /* remount read-only */
1388 if (s->s_flags & MS_RDONLY)
1389 /* it is read-only already */
1393 * Drop write lock. Quota will retake it when needed and lock
1394 * ordering requires calling dquot_suspend() without it.
1396 reiserfs_write_unlock(s);
1397 err = dquot_suspend(s, -1);
1400 reiserfs_write_lock(s);
1402 /* try to remount file system with read-only permissions */
1403 if (sb_umount_state(rs) == REISERFS_VALID_FS
1404 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1408 err = journal_begin(&th, s, 10);
1412 /* Mounting a rw partition read-only. */
1413 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1414 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1415 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1417 /* remount read-write */
1418 if (!(s->s_flags & MS_RDONLY)) {
1419 reiserfs_xattr_init(s, *mount_flags);
1420 goto out_ok; /* We are read-write already */
1423 if (reiserfs_is_journal_aborted(journal)) {
1424 err = journal->j_errno;
1428 handle_data_mode(s, mount_options);
1429 handle_barrier_mode(s, mount_options);
1430 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1431 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1432 err = journal_begin(&th, s, 10);
1436 /* Mount a partition which is read-only, read-write */
1437 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1438 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1439 s->s_flags &= ~MS_RDONLY;
1440 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1441 if (!old_format_only(s))
1442 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1443 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1444 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1445 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1447 /* this will force a full flush of all journal lists */
1448 SB_JOURNAL(s)->j_must_wait = 1;
1449 err = journal_end(&th, s, 10);
1453 if (!(*mount_flags & MS_RDONLY)) {
1455 * Drop write lock. Quota will retake it when needed and lock
1456 * ordering requires calling dquot_resume() without it.
1458 reiserfs_write_unlock(s);
1459 dquot_resume(s, -1);
1460 reiserfs_write_lock(s);
1461 finish_unfinished(s);
1462 reiserfs_xattr_init(s, *mount_flags);
1466 replace_mount_options(s, new_opts);
1467 reiserfs_write_unlock(s);
1471 reiserfs_write_unlock(s);
1477 static int read_super_block(struct super_block *s, int offset)
1479 struct buffer_head *bh;
1480 struct reiserfs_super_block *rs;
1483 bh = sb_bread(s, offset / s->s_blocksize);
1485 reiserfs_warning(s, "sh-2006",
1486 "bread failed (dev %s, block %lu, size %lu)",
1487 reiserfs_bdevname(s), offset / s->s_blocksize,
1492 rs = (struct reiserfs_super_block *)bh->b_data;
1493 if (!is_any_reiserfs_magic_string(rs)) {
1498 // ok, reiserfs signature (old or new) found in at the given offset
1500 fs_blocksize = sb_blocksize(rs);
1502 sb_set_blocksize(s, fs_blocksize);
1504 bh = sb_bread(s, offset / s->s_blocksize);
1506 reiserfs_warning(s, "sh-2007",
1507 "bread failed (dev %s, block %lu, size %lu)",
1508 reiserfs_bdevname(s), offset / s->s_blocksize,
1513 rs = (struct reiserfs_super_block *)bh->b_data;
1514 if (sb_blocksize(rs) != s->s_blocksize) {
1515 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1516 "filesystem on (dev %s, block %Lu, size %lu)",
1517 reiserfs_bdevname(s),
1518 (unsigned long long)bh->b_blocknr,
1524 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1526 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1527 "--rebuild-tree run detected. Please run\n"
1528 "reiserfsck --rebuild-tree and wait for a "
1529 "completion. If that fails\n"
1530 "get newer reiserfsprogs package");
1534 SB_BUFFER_WITH_SB(s) = bh;
1535 SB_DISK_SUPER_BLOCK(s) = rs;
1537 if (is_reiserfs_jr(rs)) {
1538 /* magic is of non-standard journal filesystem, look at s_version to
1539 find which format is in use */
1540 if (sb_version(rs) == REISERFS_VERSION_2)
1541 reiserfs_info(s, "found reiserfs format \"3.6\""
1542 " with non-standard journal\n");
1543 else if (sb_version(rs) == REISERFS_VERSION_1)
1544 reiserfs_info(s, "found reiserfs format \"3.5\""
1545 " with non-standard journal\n");
1547 reiserfs_warning(s, "sh-2012", "found unknown "
1548 "format \"%u\" of reiserfs with "
1549 "non-standard magic", sb_version(rs));
1553 /* s_version of standard format may contain incorrect information,
1554 so we just look at the magic string */
1556 "found reiserfs format \"%s\" with standard journal\n",
1557 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1559 s->s_op = &reiserfs_sops;
1560 s->s_export_op = &reiserfs_export_ops;
1562 s->s_qcop = &reiserfs_qctl_operations;
1563 s->dq_op = &reiserfs_quota_operations;
1566 /* new format is limited by the 32 bit wide i_blocks field, want to
1567 ** be one full block below that.
1569 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1573 /* after journal replay, reread all bitmap and super blocks */
1574 static int reread_meta_blocks(struct super_block *s)
1576 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1577 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1578 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1579 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1586 /////////////////////////////////////////////////////
1587 // hash detection stuff
1589 // if root directory is empty - we set default - Yura's - hash and
1591 // FIXME: we look for only one name in a directory. If tea and yura
1592 // bith have the same value - we ask user to send report to the
1594 static __u32 find_hash_out(struct super_block *s)
1597 struct inode *inode;
1599 INITIALIZE_PATH(path);
1600 struct reiserfs_dir_entry de;
1601 __u32 hash = DEFAULT_HASH;
1603 inode = s->s_root->d_inode;
1605 do { // Some serious "goto"-hater was there ;)
1606 u32 teahash, r5hash, yurahash;
1608 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1609 retval = search_by_entry_key(s, &key, &path, &de);
1610 if (retval == IO_ERROR) {
1614 if (retval == NAME_NOT_FOUND)
1616 set_de_name_and_namelen(&de);
1617 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1618 /* allow override in this case */
1619 if (reiserfs_rupasov_hash(s)) {
1622 reiserfs_info(s, "FS seems to be empty, autodetect "
1623 "is using the default hash\n");
1626 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1627 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1628 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1629 if (((teahash == r5hash)
1631 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1632 == r5hash)) || ((teahash == yurahash)
1634 GET_HASH_VALUE(deh_offset
1639 || ((r5hash == yurahash)
1641 GET_HASH_VALUE(deh_offset
1642 (&(de.de_deh[de.de_entry_num])))))) {
1643 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1644 "automatically detect hash function. "
1645 "Please mount with -o "
1646 "hash={tea,rupasov,r5}");
1650 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1653 else if (GET_HASH_VALUE
1654 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1656 else if (GET_HASH_VALUE
1657 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1660 reiserfs_warning(s, "reiserfs-2506",
1661 "Unrecognised hash function");
1670 // finds out which hash names are sorted with
1671 static int what_hash(struct super_block *s)
1675 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1677 /* reiserfs_hash_detect() == true if any of the hash mount options
1678 ** were used. We must check them to make sure the user isn't
1679 ** using a bad hash value
1681 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1682 code = find_hash_out(s);
1684 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1685 /* detection has found the hash, and we must check against the
1688 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1689 reiserfs_warning(s, "reiserfs-2507",
1690 "Error, %s hash detected, "
1691 "unable to force rupasov hash",
1692 reiserfs_hashname(code));
1694 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1695 reiserfs_warning(s, "reiserfs-2508",
1696 "Error, %s hash detected, "
1697 "unable to force tea hash",
1698 reiserfs_hashname(code));
1700 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1701 reiserfs_warning(s, "reiserfs-2509",
1702 "Error, %s hash detected, "
1703 "unable to force r5 hash",
1704 reiserfs_hashname(code));
1708 /* find_hash_out was not called or could not determine the hash */
1709 if (reiserfs_rupasov_hash(s)) {
1711 } else if (reiserfs_tea_hash(s)) {
1713 } else if (reiserfs_r5_hash(s)) {
1718 /* if we are mounted RW, and we have a new valid hash code, update
1721 if (code != UNSET_HASH &&
1722 !(s->s_flags & MS_RDONLY) &&
1723 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1724 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1729 // return pointer to appropriate function
1730 static hashf_t hash_function(struct super_block *s)
1732 switch (what_hash(s)) {
1734 reiserfs_info(s, "Using tea hash to sort names\n");
1737 reiserfs_info(s, "Using rupasov hash to sort names\n");
1740 reiserfs_info(s, "Using r5 hash to sort names\n");
1746 // this is used to set up correct value for old partitions
1747 static int function2code(hashf_t func)
1749 if (func == keyed_hash)
1751 if (func == yura_hash)
1753 if (func == r5_hash)
1756 BUG(); // should never happen
1761 #define SWARN(silent, s, id, ...) \
1763 reiserfs_warning(s, id, __VA_ARGS__)
1765 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1767 struct inode *root_inode;
1768 struct reiserfs_transaction_handle th;
1770 unsigned long blocks;
1771 unsigned int commit_max_age = 0;
1773 struct reiserfs_iget_args args;
1774 struct reiserfs_super_block *rs;
1776 struct reiserfs_sb_info *sbi;
1777 int errval = -EINVAL;
1778 char *qf_names[MAXQUOTAS] = {};
1779 unsigned int qfmt = 0;
1781 save_mount_options(s, data);
1783 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1787 /* Set default values for options: non-aggressive tails, RO on errors */
1788 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1789 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1790 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1791 /* no preallocation minimum, be smart in
1792 reiserfs_file_write instead */
1793 sbi->s_alloc_options.preallocmin = 0;
1794 /* Preallocate by 16 blocks (17-1) at once */
1795 sbi->s_alloc_options.preallocsize = 17;
1796 /* setup default block allocator options */
1797 reiserfs_init_alloc_options(s);
1799 spin_lock_init(&sbi->old_work_lock);
1800 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1801 mutex_init(&sbi->lock);
1802 sbi->lock_depth = -1;
1805 if (reiserfs_parse_options
1806 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1807 &commit_max_age, qf_names, &qfmt) == 0) {
1808 goto error_unlocked;
1810 if (jdev_name && jdev_name[0]) {
1811 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1813 SWARN(silent, s, "", "Cannot allocate memory for "
1814 "journal device name");
1819 handle_quota_files(s, qf_names, &qfmt);
1823 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1824 goto error_unlocked;
1827 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1828 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1830 /* try new format (64-th 1k block), which can contain reiserfs super block */
1831 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1832 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1833 reiserfs_bdevname(s));
1834 goto error_unlocked;
1837 rs = SB_DISK_SUPER_BLOCK(s);
1838 /* Let's do basic sanity check to verify that underlying device is not
1839 smaller than the filesystem. If the check fails then abort and scream,
1840 because bad stuff will happen otherwise. */
1841 if (s->s_bdev && s->s_bdev->bd_inode
1842 && i_size_read(s->s_bdev->bd_inode) <
1843 sb_block_count(rs) * sb_blocksize(rs)) {
1844 SWARN(silent, s, "", "Filesystem cannot be "
1845 "mounted because it is bigger than the device");
1846 SWARN(silent, s, "", "You may need to run fsck "
1847 "or increase size of your LVM partition");
1848 SWARN(silent, s, "", "Or may be you forgot to "
1849 "reboot after fdisk when it told you to");
1850 goto error_unlocked;
1853 sbi->s_mount_state = SB_REISERFS_STATE(s);
1854 sbi->s_mount_state = REISERFS_VALID_FS;
1856 if ((errval = reiserfs_init_bitmap_cache(s))) {
1857 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1858 goto error_unlocked;
1862 #ifdef CONFIG_REISERFS_CHECK
1863 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1864 SWARN(silent, s, "", "- it is slow mode for debugging.");
1867 /* make data=ordered the default */
1868 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1869 !reiserfs_data_writeback(s)) {
1870 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1873 if (reiserfs_data_log(s)) {
1874 reiserfs_info(s, "using journaled data mode\n");
1875 } else if (reiserfs_data_ordered(s)) {
1876 reiserfs_info(s, "using ordered data mode\n");
1878 reiserfs_info(s, "using writeback data mode\n");
1880 if (reiserfs_barrier_flush(s)) {
1881 printk("reiserfs: using flush barriers\n");
1884 // set_device_ro(s->s_dev, 1) ;
1885 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1886 SWARN(silent, s, "sh-2022",
1887 "unable to initialize journal space");
1888 goto error_unlocked;
1890 jinit_done = 1; /* once this is set, journal_release must be called
1891 ** if we error out of the mount
1895 if (reread_meta_blocks(s)) {
1896 SWARN(silent, s, "jmacd-9",
1897 "unable to reread meta blocks after journal init");
1898 goto error_unlocked;
1902 goto error_unlocked;
1904 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1905 SWARN(silent, s, "clm-7000",
1906 "Detected readonly device, marking FS readonly");
1907 s->s_flags |= MS_RDONLY;
1909 args.objectid = REISERFS_ROOT_OBJECTID;
1910 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1912 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1913 reiserfs_init_locked_inode, (void *)(&args));
1915 SWARN(silent, s, "jmacd-10", "get root inode failed");
1916 goto error_unlocked;
1920 * This path assumed to be called with the BKL in the old times.
1921 * Now we have inherited the big reiserfs lock from it and many
1922 * reiserfs helpers called in the mount path and elsewhere require
1923 * this lock to be held even if it's not always necessary. Let's be
1924 * conservative and hold it early. The window can be reduced after
1925 * careful review of the code.
1927 reiserfs_write_lock(s);
1929 if (root_inode->i_state & I_NEW) {
1930 reiserfs_read_locked_inode(root_inode, &args);
1931 unlock_new_inode(root_inode);
1934 s->s_root = d_make_root(root_inode);
1937 // define and initialize hash function
1938 sbi->s_hash_function = hash_function(s);
1939 if (sbi->s_hash_function == NULL) {
1945 if (is_reiserfs_3_5(rs)
1946 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1947 set_bit(REISERFS_3_5, &(sbi->s_properties));
1948 else if (old_format)
1949 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1951 set_bit(REISERFS_3_6, &(sbi->s_properties));
1953 if (!(s->s_flags & MS_RDONLY)) {
1955 errval = journal_begin(&th, s, 1);
1961 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1963 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1964 set_sb_fs_state(rs, 0);
1966 /* Clear out s_bmap_nr if it would wrap. We can handle this
1967 * case, but older revisions can't. This will cause the
1968 * file system to fail mount on those older implementations,
1969 * avoiding corruption. -jeffm */
1970 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1971 sb_bmap_nr(rs) != 0) {
1972 reiserfs_warning(s, "super-2030", "This file system "
1973 "claims to use %u bitmap blocks in "
1974 "its super block, but requires %u. "
1975 "Clearing to zero.", sb_bmap_nr(rs),
1976 reiserfs_bmap_count(s));
1978 set_sb_bmap_nr(rs, 0);
1981 if (old_format_only(s)) {
1982 /* filesystem of format 3.5 either with standard or non-standard
1984 if (convert_reiserfs(s)) {
1985 /* and -o conv is given */
1988 "converting 3.5 filesystem to the 3.6 format");
1990 if (is_reiserfs_3_5(rs))
1991 /* put magic string of 3.6 format. 2.2 will not be able to
1992 mount this filesystem anymore */
1993 memcpy(rs->s_v1.s_magic,
1994 reiserfs_3_6_magic_string,
1996 (reiserfs_3_6_magic_string));
1998 set_sb_version(rs, REISERFS_VERSION_2);
1999 reiserfs_convert_objectid_map_v1(s);
2000 set_bit(REISERFS_3_6, &(sbi->s_properties));
2001 clear_bit(REISERFS_3_5, &(sbi->s_properties));
2002 } else if (!silent) {
2003 reiserfs_info(s, "using 3.5.x disk format\n");
2006 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2009 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2010 errval = journal_end(&th, s, 1);
2017 if ((errval = reiserfs_lookup_privroot(s)) ||
2018 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2024 /* look for files which were to be removed in previous session */
2025 finish_unfinished(s);
2027 if (old_format_only(s) && !silent) {
2028 reiserfs_info(s, "using 3.5.x disk format\n");
2031 if ((errval = reiserfs_lookup_privroot(s)) ||
2032 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2038 // mark hash in super block: it could be unset. overwrite should be ok
2039 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2043 reiserfs_proc_info_init(s);
2045 init_waitqueue_head(&(sbi->s_wait));
2046 spin_lock_init(&sbi->bitmap_lock);
2048 reiserfs_write_unlock(s);
2053 reiserfs_write_unlock(s);
2056 /* kill the commit thread, free journal ram */
2058 reiserfs_write_lock(s);
2059 journal_release_error(NULL, s);
2060 reiserfs_write_unlock(s);
2063 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2065 reiserfs_free_bitmap_cache(s);
2066 if (SB_BUFFER_WITH_SB(s))
2067 brelse(SB_BUFFER_WITH_SB(s));
2071 for (j = 0; j < MAXQUOTAS; j++)
2077 s->s_fs_info = NULL;
2081 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2083 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2085 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2086 buf->f_bfree = sb_free_blocks(rs);
2087 buf->f_bavail = buf->f_bfree;
2088 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2089 buf->f_bsize = dentry->d_sb->s_blocksize;
2090 /* changed to accommodate gcc folks. */
2091 buf->f_type = REISERFS_SUPER_MAGIC;
2092 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2093 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2094 sizeof(rs->s_uuid)/2);
2100 static int reiserfs_write_dquot(struct dquot *dquot)
2102 struct reiserfs_transaction_handle th;
2105 reiserfs_write_lock(dquot->dq_sb);
2107 journal_begin(&th, dquot->dq_sb,
2108 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2111 ret = dquot_commit(dquot);
2113 journal_end(&th, dquot->dq_sb,
2114 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2118 reiserfs_write_unlock(dquot->dq_sb);
2122 static int reiserfs_acquire_dquot(struct dquot *dquot)
2124 struct reiserfs_transaction_handle th;
2127 reiserfs_write_lock(dquot->dq_sb);
2129 journal_begin(&th, dquot->dq_sb,
2130 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2133 ret = dquot_acquire(dquot);
2135 journal_end(&th, dquot->dq_sb,
2136 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2140 reiserfs_write_unlock(dquot->dq_sb);
2144 static int reiserfs_release_dquot(struct dquot *dquot)
2146 struct reiserfs_transaction_handle th;
2149 reiserfs_write_lock(dquot->dq_sb);
2151 journal_begin(&th, dquot->dq_sb,
2152 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2154 /* Release dquot anyway to avoid endless cycle in dqput() */
2155 dquot_release(dquot);
2158 ret = dquot_release(dquot);
2160 journal_end(&th, dquot->dq_sb,
2161 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2165 reiserfs_write_unlock(dquot->dq_sb);
2169 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2171 /* Are we journaling quotas? */
2172 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2173 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2174 dquot_mark_dquot_dirty(dquot);
2175 return reiserfs_write_dquot(dquot);
2177 return dquot_mark_dquot_dirty(dquot);
2180 static int reiserfs_write_info(struct super_block *sb, int type)
2182 struct reiserfs_transaction_handle th;
2185 /* Data block + inode block */
2186 reiserfs_write_lock(sb);
2187 ret = journal_begin(&th, sb, 2);
2190 ret = dquot_commit_info(sb, type);
2191 err = journal_end(&th, sb, 2);
2195 reiserfs_write_unlock(sb);
2200 * Turn on quotas during mount time - we need to find the quota file and such...
2202 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2204 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2205 REISERFS_SB(sb)->s_jquota_fmt, type);
2209 * Standard function to be called on quota_on
2211 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2215 struct inode *inode;
2216 struct reiserfs_transaction_handle th;
2217 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2219 reiserfs_write_lock(sb);
2220 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2225 /* Quotafile not on the same filesystem? */
2226 if (path->dentry->d_sb != sb) {
2230 inode = path->dentry->d_inode;
2231 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2232 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2233 err = reiserfs_unpack(inode, NULL);
2235 reiserfs_warning(sb, "super-6520",
2236 "Unpacking tail of quota file failed"
2237 " (%d). Cannot turn on quotas.", err);
2241 mark_inode_dirty(inode);
2243 /* Journaling quota? */
2244 if (REISERFS_SB(sb)->s_qf_names[type]) {
2245 /* Quotafile not of fs root? */
2246 if (path->dentry->d_parent != sb->s_root)
2247 reiserfs_warning(sb, "super-6521",
2248 "Quota file not on filesystem root. "
2249 "Journalled quota will not work.");
2253 * When we journal data on quota file, we have to flush journal to see
2254 * all updates to the file when we bypass pagecache...
2256 if (reiserfs_file_data_log(inode)) {
2257 /* Just start temporary transaction and finish it */
2258 err = journal_begin(&th, sb, 1);
2261 err = journal_end_sync(&th, sb, 1);
2265 reiserfs_write_unlock(sb);
2266 return dquot_quota_on(sb, type, format_id, path);
2268 reiserfs_write_unlock(sb);
2272 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2273 * acquiring the locks... As quota files are never truncated and quota code
2274 * itself serializes the operations (and no one else should touch the files)
2275 * we don't have to be afraid of races */
2276 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2277 size_t len, loff_t off)
2279 struct inode *inode = sb_dqopt(sb)->files[type];
2280 unsigned long blk = off >> sb->s_blocksize_bits;
2281 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2283 struct buffer_head tmp_bh, *bh;
2284 loff_t i_size = i_size_read(inode);
2288 if (off + len > i_size)
2291 while (toread > 0) {
2293 sb->s_blocksize - offset <
2294 toread ? sb->s_blocksize - offset : toread;
2296 /* Quota files are without tails so we can safely use this function */
2297 reiserfs_write_lock(sb);
2298 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2299 reiserfs_write_unlock(sb);
2302 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2303 memset(data, 0, tocopy);
2305 bh = sb_bread(sb, tmp_bh.b_blocknr);
2308 memcpy(data, bh->b_data + offset, tocopy);
2319 /* Write to quotafile (we know the transaction is already started and has
2320 * enough credits) */
2321 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2322 const char *data, size_t len, loff_t off)
2324 struct inode *inode = sb_dqopt(sb)->files[type];
2325 unsigned long blk = off >> sb->s_blocksize_bits;
2326 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2327 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2328 size_t towrite = len;
2329 struct buffer_head tmp_bh, *bh;
2331 if (!current->journal_info) {
2332 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2333 " cancelled because transaction is not started.\n",
2334 (unsigned long long)off, (unsigned long long)len);
2337 while (towrite > 0) {
2338 tocopy = sb->s_blocksize - offset < towrite ?
2339 sb->s_blocksize - offset : towrite;
2341 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2344 if (offset || tocopy != sb->s_blocksize)
2345 bh = sb_bread(sb, tmp_bh.b_blocknr);
2347 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2353 memcpy(bh->b_data + offset, data, tocopy);
2354 flush_dcache_page(bh->b_page);
2355 set_buffer_uptodate(bh);
2357 reiserfs_prepare_for_journal(sb, bh, 1);
2358 journal_mark_dirty(current->journal_info, sb, bh);
2360 reiserfs_add_ordered_list(inode, bh);
2370 if (inode->i_size < off + len - towrite)
2371 i_size_write(inode, off + len - towrite);
2373 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2374 mark_inode_dirty(inode);
2375 return len - towrite;
2380 static struct dentry *get_super_block(struct file_system_type *fs_type,
2381 int flags, const char *dev_name,
2384 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2387 static int __init init_reiserfs_fs(void)
2391 if ((ret = init_inodecache())) {
2395 reiserfs_proc_info_global_init();
2397 ret = register_filesystem(&reiserfs_fs_type);
2403 reiserfs_proc_info_global_done();
2404 destroy_inodecache();
2409 static void __exit exit_reiserfs_fs(void)
2411 reiserfs_proc_info_global_done();
2412 unregister_filesystem(&reiserfs_fs_type);
2413 destroy_inodecache();
2416 struct file_system_type reiserfs_fs_type = {
2417 .owner = THIS_MODULE,
2419 .mount = get_super_block,
2420 .kill_sb = reiserfs_kill_sb,
2421 .fs_flags = FS_REQUIRES_DEV,
2424 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2425 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2426 MODULE_LICENSE("GPL");
2428 module_init(init_reiserfs_fs);
2429 module_exit(exit_reiserfs_fs);