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Linux/fs/reiserfs/super.c

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  1 /*
  2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
  3  *
  4  * Trivial changes by Alan Cox to add the LFS fixes
  5  *
  6  * Trivial Changes:
  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.
 10  *
 11  * NO WARRANTY
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/slab.h>
 16 #include <linux/vmalloc.h>
 17 #include <linux/time.h>
 18 #include <linux/uaccess.h>
 19 #include "reiserfs.h"
 20 #include "acl.h"
 21 #include "xattr.h"
 22 #include <linux/init.h>
 23 #include <linux/blkdev.h>
 24 #include <linux/backing-dev.h>
 25 #include <linux/buffer_head.h>
 26 #include <linux/exportfs.h>
 27 #include <linux/quotaops.h>
 28 #include <linux/vfs.h>
 29 #include <linux/mount.h>
 30 #include <linux/namei.h>
 31 #include <linux/crc32.h>
 32 #include <linux/seq_file.h>
 33 
 34 struct file_system_type reiserfs_fs_type;
 35 
 36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
 37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
 38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
 39 
 40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
 41 {
 42         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
 43                         strlen(reiserfs_3_5_magic_string));
 44 }
 45 
 46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
 47 {
 48         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
 49                         strlen(reiserfs_3_6_magic_string));
 50 }
 51 
 52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
 53 {
 54         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
 55                         strlen(reiserfs_jr_magic_string));
 56 }
 57 
 58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
 59 {
 60         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
 61                 is_reiserfs_jr(rs));
 62 }
 63 
 64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
 65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
 66 
 67 static int reiserfs_sync_fs(struct super_block *s, int wait)
 68 {
 69         struct reiserfs_transaction_handle th;
 70 
 71         /*
 72          * Writeback quota in non-journalled quota case - journalled quota has
 73          * no dirty dquots
 74          */
 75         dquot_writeback_dquots(s, -1);
 76         reiserfs_write_lock(s);
 77         if (!journal_begin(&th, s, 1))
 78                 if (!journal_end_sync(&th))
 79                         reiserfs_flush_old_commits(s);
 80         reiserfs_write_unlock(s);
 81         return 0;
 82 }
 83 
 84 static void flush_old_commits(struct work_struct *work)
 85 {
 86         struct reiserfs_sb_info *sbi;
 87         struct super_block *s;
 88 
 89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
 90         s = sbi->s_journal->j_work_sb;
 91 
 92         /*
 93          * We need s_umount for protecting quota writeback. We have to use
 94          * trylock as reiserfs_cancel_old_flush() may be waiting for this work
 95          * to complete with s_umount held.
 96          */
 97         if (!down_read_trylock(&s->s_umount)) {
 98                 /* Requeue work if we are not cancelling it */
 99                 spin_lock(&sbi->old_work_lock);
100                 if (sbi->work_queued == 1)
101                         queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
102                 spin_unlock(&sbi->old_work_lock);
103                 return;
104         }
105         spin_lock(&sbi->old_work_lock);
106         /* Avoid clobbering the cancel state... */
107         if (sbi->work_queued == 1)
108                 sbi->work_queued = 0;
109         spin_unlock(&sbi->old_work_lock);
110 
111         reiserfs_sync_fs(s, 1);
112         up_read(&s->s_umount);
113 }
114 
115 void reiserfs_schedule_old_flush(struct super_block *s)
116 {
117         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
118         unsigned long delay;
119 
120         /*
121          * Avoid scheduling flush when sb is being shut down. It can race
122          * with journal shutdown and free still queued delayed work.
123          */
124         if (sb_rdonly(s) || !(s->s_flags & SB_ACTIVE))
125                 return;
126 
127         spin_lock(&sbi->old_work_lock);
128         if (!sbi->work_queued) {
129                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
130                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
131                 sbi->work_queued = 1;
132         }
133         spin_unlock(&sbi->old_work_lock);
134 }
135 
136 void reiserfs_cancel_old_flush(struct super_block *s)
137 {
138         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
139 
140         spin_lock(&sbi->old_work_lock);
141         /* Make sure no new flushes will be queued */
142         sbi->work_queued = 2;
143         spin_unlock(&sbi->old_work_lock);
144         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
145 }
146 
147 static int reiserfs_freeze(struct super_block *s)
148 {
149         struct reiserfs_transaction_handle th;
150 
151         reiserfs_cancel_old_flush(s);
152 
153         reiserfs_write_lock(s);
154         if (!sb_rdonly(s)) {
155                 int err = journal_begin(&th, s, 1);
156                 if (err) {
157                         reiserfs_block_writes(&th);
158                 } else {
159                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
160                                                      1);
161                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
162                         reiserfs_block_writes(&th);
163                         journal_end_sync(&th);
164                 }
165         }
166         reiserfs_write_unlock(s);
167         return 0;
168 }
169 
170 static int reiserfs_unfreeze(struct super_block *s)
171 {
172         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
173 
174         reiserfs_allow_writes(s);
175         spin_lock(&sbi->old_work_lock);
176         /* Allow old_work to run again */
177         sbi->work_queued = 0;
178         spin_unlock(&sbi->old_work_lock);
179         return 0;
180 }
181 
182 extern const struct in_core_key MAX_IN_CORE_KEY;
183 
184 /*
185  * this is used to delete "save link" when there are no items of a
186  * file it points to. It can either happen if unlink is completed but
187  * "save unlink" removal, or if file has both unlink and truncate
188  * pending and as unlink completes first (because key of "save link"
189  * protecting unlink is bigger that a key lf "save link" which
190  * protects truncate), so there left no items to make truncate
191  * completion on
192  */
193 static int remove_save_link_only(struct super_block *s,
194                                  struct reiserfs_key *key, int oid_free)
195 {
196         struct reiserfs_transaction_handle th;
197         int err;
198 
199         /* we are going to do one balancing */
200         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
201         if (err)
202                 return err;
203 
204         reiserfs_delete_solid_item(&th, NULL, key);
205         if (oid_free)
206                 /* removals are protected by direct items */
207                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
208 
209         return journal_end(&th);
210 }
211 
212 #ifdef CONFIG_QUOTA
213 static int reiserfs_quota_on_mount(struct super_block *, int);
214 #endif
215 
216 /*
217  * Look for uncompleted unlinks and truncates and complete them
218  *
219  * Called with superblock write locked.  If quotas are enabled, we have to
220  * release/retake lest we call dquot_quota_on_mount(), proceed to
221  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
222  * cpu worklets to complete flush_async_commits() that in turn wait for the
223  * superblock write lock.
224  */
225 static int finish_unfinished(struct super_block *s)
226 {
227         INITIALIZE_PATH(path);
228         struct cpu_key max_cpu_key, obj_key;
229         struct reiserfs_key save_link_key, last_inode_key;
230         int retval = 0;
231         struct item_head *ih;
232         struct buffer_head *bh;
233         int item_pos;
234         char *item;
235         int done;
236         struct inode *inode;
237         int truncate;
238 #ifdef CONFIG_QUOTA
239         int i;
240         int ms_active_set;
241         int quota_enabled[REISERFS_MAXQUOTAS];
242 #endif
243 
244         /* compose key to look for "save" links */
245         max_cpu_key.version = KEY_FORMAT_3_5;
246         max_cpu_key.on_disk_key.k_dir_id = ~0U;
247         max_cpu_key.on_disk_key.k_objectid = ~0U;
248         set_cpu_key_k_offset(&max_cpu_key, ~0U);
249         max_cpu_key.key_length = 3;
250 
251         memset(&last_inode_key, 0, sizeof(last_inode_key));
252 
253 #ifdef CONFIG_QUOTA
254         /* Needed for iput() to work correctly and not trash data */
255         if (s->s_flags & SB_ACTIVE) {
256                 ms_active_set = 0;
257         } else {
258                 ms_active_set = 1;
259                 s->s_flags |= SB_ACTIVE;
260         }
261         /* Turn on quotas so that they are updated correctly */
262         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
263                 quota_enabled[i] = 1;
264                 if (REISERFS_SB(s)->s_qf_names[i]) {
265                         int ret;
266 
267                         if (sb_has_quota_active(s, i)) {
268                                 quota_enabled[i] = 0;
269                                 continue;
270                         }
271                         reiserfs_write_unlock(s);
272                         ret = reiserfs_quota_on_mount(s, i);
273                         reiserfs_write_lock(s);
274                         if (ret < 0)
275                                 reiserfs_warning(s, "reiserfs-2500",
276                                                  "cannot turn on journaled "
277                                                  "quota: error %d", ret);
278                 }
279         }
280 #endif
281 
282         done = 0;
283         REISERFS_SB(s)->s_is_unlinked_ok = 1;
284         while (!retval) {
285                 int depth;
286                 retval = search_item(s, &max_cpu_key, &path);
287                 if (retval != ITEM_NOT_FOUND) {
288                         reiserfs_error(s, "vs-2140",
289                                        "search_by_key returned %d", retval);
290                         break;
291                 }
292 
293                 bh = get_last_bh(&path);
294                 item_pos = get_item_pos(&path);
295                 if (item_pos != B_NR_ITEMS(bh)) {
296                         reiserfs_warning(s, "vs-2060",
297                                          "wrong position found");
298                         break;
299                 }
300                 item_pos--;
301                 ih = item_head(bh, item_pos);
302 
303                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
304                         /* there are no "save" links anymore */
305                         break;
306 
307                 save_link_key = ih->ih_key;
308                 if (is_indirect_le_ih(ih))
309                         truncate = 1;
310                 else
311                         truncate = 0;
312 
313                 /* reiserfs_iget needs k_dirid and k_objectid only */
314                 item = ih_item_body(bh, ih);
315                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
316                 obj_key.on_disk_key.k_objectid =
317                     le32_to_cpu(ih->ih_key.k_objectid);
318                 obj_key.on_disk_key.k_offset = 0;
319                 obj_key.on_disk_key.k_type = 0;
320 
321                 pathrelse(&path);
322 
323                 inode = reiserfs_iget(s, &obj_key);
324                 if (IS_ERR_OR_NULL(inode)) {
325                         /*
326                          * the unlink almost completed, it just did not
327                          * manage to remove "save" link and release objectid
328                          */
329                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
330                                          &obj_key);
331                         retval = remove_save_link_only(s, &save_link_key, 1);
332                         continue;
333                 }
334 
335                 if (!truncate && inode->i_nlink) {
336                         /* file is not unlinked */
337                         reiserfs_warning(s, "vs-2185",
338                                          "file %K is not unlinked",
339                                          &obj_key);
340                         retval = remove_save_link_only(s, &save_link_key, 0);
341                         continue;
342                 }
343                 depth = reiserfs_write_unlock_nested(inode->i_sb);
344                 dquot_initialize(inode);
345                 reiserfs_write_lock_nested(inode->i_sb, depth);
346 
347                 if (truncate && S_ISDIR(inode->i_mode)) {
348                         /*
349                          * We got a truncate request for a dir which
350                          * is impossible.  The only imaginable way is to
351                          * execute unfinished truncate request then boot
352                          * into old kernel, remove the file and create dir
353                          * with the same key.
354                          */
355                         reiserfs_warning(s, "green-2101",
356                                          "impossible truncate on a "
357                                          "directory %k. Please report",
358                                          INODE_PKEY(inode));
359                         retval = remove_save_link_only(s, &save_link_key, 0);
360                         truncate = 0;
361                         iput(inode);
362                         continue;
363                 }
364 
365                 if (truncate) {
366                         REISERFS_I(inode)->i_flags |=
367                             i_link_saved_truncate_mask;
368                         /*
369                          * not completed truncate found. New size was
370                          * committed together with "save" link
371                          */
372                         reiserfs_info(s, "Truncating %k to %lld ..",
373                                       INODE_PKEY(inode), inode->i_size);
374 
375                         /* don't update modification time */
376                         reiserfs_truncate_file(inode, 0);
377 
378                         retval = remove_save_link(inode, truncate);
379                 } else {
380                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
381                         /* not completed unlink (rmdir) found */
382                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
383                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
384                                         sizeof(last_inode_key))){
385                                 last_inode_key = *INODE_PKEY(inode);
386                                 /* removal gets completed in iput */
387                                 retval = 0;
388                         } else {
389                                 reiserfs_warning(s, "super-2189", "Dead loop "
390                                                  "in finish_unfinished "
391                                                  "detected, just remove "
392                                                  "save link\n");
393                                 retval = remove_save_link_only(s,
394                                                         &save_link_key, 0);
395                         }
396                 }
397 
398                 iput(inode);
399                 printk("done\n");
400                 done++;
401         }
402         REISERFS_SB(s)->s_is_unlinked_ok = 0;
403 
404 #ifdef CONFIG_QUOTA
405         /* Turn quotas off */
406         reiserfs_write_unlock(s);
407         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
408                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
409                         dquot_quota_off(s, i);
410         }
411         reiserfs_write_lock(s);
412         if (ms_active_set)
413                 /* Restore the flag back */
414                 s->s_flags &= ~SB_ACTIVE;
415 #endif
416         pathrelse(&path);
417         if (done)
418                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
419                               "Completed\n", done);
420         return retval;
421 }
422 
423 /*
424  * to protect file being unlinked from getting lost we "safe" link files
425  * being unlinked. This link will be deleted in the same transaction with last
426  * item of file. mounting the filesystem we scan all these links and remove
427  * files which almost got lost
428  */
429 void add_save_link(struct reiserfs_transaction_handle *th,
430                    struct inode *inode, int truncate)
431 {
432         INITIALIZE_PATH(path);
433         int retval;
434         struct cpu_key key;
435         struct item_head ih;
436         __le32 link;
437 
438         BUG_ON(!th->t_trans_id);
439 
440         /* file can only get one "save link" of each kind */
441         RFALSE(truncate &&
442                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
443                "saved link already exists for truncated inode %lx",
444                (long)inode->i_ino);
445         RFALSE(!truncate &&
446                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
447                "saved link already exists for unlinked inode %lx",
448                (long)inode->i_ino);
449 
450         /* setup key of "save" link */
451         key.version = KEY_FORMAT_3_5;
452         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
453         key.on_disk_key.k_objectid = inode->i_ino;
454         if (!truncate) {
455                 /* unlink, rmdir, rename */
456                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
457                 set_cpu_key_k_type(&key, TYPE_DIRECT);
458 
459                 /* item head of "safe" link */
460                 make_le_item_head(&ih, &key, key.version,
461                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
462                                   4 /*length */ , 0xffff /*free space */ );
463         } else {
464                 /* truncate */
465                 if (S_ISDIR(inode->i_mode))
466                         reiserfs_warning(inode->i_sb, "green-2102",
467                                          "Adding a truncate savelink for "
468                                          "a directory %k! Please report",
469                                          INODE_PKEY(inode));
470                 set_cpu_key_k_offset(&key, 1);
471                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
472 
473                 /* item head of "safe" link */
474                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
475                                   4 /*length */ , 0 /*free space */ );
476         }
477         key.key_length = 3;
478 
479         /* look for its place in the tree */
480         retval = search_item(inode->i_sb, &key, &path);
481         if (retval != ITEM_NOT_FOUND) {
482                 if (retval != -ENOSPC)
483                         reiserfs_error(inode->i_sb, "vs-2100",
484                                        "search_by_key (%K) returned %d", &key,
485                                        retval);
486                 pathrelse(&path);
487                 return;
488         }
489 
490         /* body of "save" link */
491         link = INODE_PKEY(inode)->k_dir_id;
492 
493         /* put "save" link into tree, don't charge quota to anyone */
494         retval =
495             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
496         if (retval) {
497                 if (retval != -ENOSPC)
498                         reiserfs_error(inode->i_sb, "vs-2120",
499                                        "insert_item returned %d", retval);
500         } else {
501                 if (truncate)
502                         REISERFS_I(inode)->i_flags |=
503                             i_link_saved_truncate_mask;
504                 else
505                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
506         }
507 }
508 
509 /* this opens transaction unlike add_save_link */
510 int remove_save_link(struct inode *inode, int truncate)
511 {
512         struct reiserfs_transaction_handle th;
513         struct reiserfs_key key;
514         int err;
515 
516         /* we are going to do one balancing only */
517         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
518         if (err)
519                 return err;
520 
521         /* setup key of "save" link */
522         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
523         key.k_objectid = INODE_PKEY(inode)->k_objectid;
524         if (!truncate) {
525                 /* unlink, rmdir, rename */
526                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
527                                     1 + inode->i_sb->s_blocksize);
528                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
529         } else {
530                 /* truncate */
531                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
532                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
533         }
534 
535         if ((truncate &&
536              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
537             (!truncate &&
538              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
539                 /* don't take quota bytes from anywhere */
540                 reiserfs_delete_solid_item(&th, NULL, &key);
541         if (!truncate) {
542                 reiserfs_release_objectid(&th, inode->i_ino);
543                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
544         } else
545                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
546 
547         return journal_end(&th);
548 }
549 
550 static void reiserfs_kill_sb(struct super_block *s)
551 {
552         if (REISERFS_SB(s)) {
553                 reiserfs_proc_info_done(s);
554                 /*
555                  * Force any pending inode evictions to occur now. Any
556                  * inodes to be removed that have extended attributes
557                  * associated with them need to clean them up before
558                  * we can release the extended attribute root dentries.
559                  * shrink_dcache_for_umount will BUG if we don't release
560                  * those before it's called so ->put_super is too late.
561                  */
562                 shrink_dcache_sb(s);
563 
564                 dput(REISERFS_SB(s)->xattr_root);
565                 REISERFS_SB(s)->xattr_root = NULL;
566                 dput(REISERFS_SB(s)->priv_root);
567                 REISERFS_SB(s)->priv_root = NULL;
568         }
569 
570         kill_block_super(s);
571 }
572 
573 #ifdef CONFIG_QUOTA
574 static int reiserfs_quota_off(struct super_block *sb, int type);
575 
576 static void reiserfs_quota_off_umount(struct super_block *s)
577 {
578         int type;
579 
580         for (type = 0; type < REISERFS_MAXQUOTAS; type++)
581                 reiserfs_quota_off(s, type);
582 }
583 #else
584 static inline void reiserfs_quota_off_umount(struct super_block *s)
585 {
586 }
587 #endif
588 
589 static void reiserfs_put_super(struct super_block *s)
590 {
591         struct reiserfs_transaction_handle th;
592         th.t_trans_id = 0;
593 
594         reiserfs_quota_off_umount(s);
595 
596         reiserfs_write_lock(s);
597 
598         /*
599          * change file system state to current state if it was mounted
600          * with read-write permissions
601          */
602         if (!sb_rdonly(s)) {
603                 if (!journal_begin(&th, s, 10)) {
604                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
605                                                      1);
606                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
607                                             REISERFS_SB(s)->s_mount_state);
608                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
609                 }
610         }
611 
612         /*
613          * note, journal_release checks for readonly mount, and can
614          * decide not to do a journal_end
615          */
616         journal_release(&th, s);
617 
618         reiserfs_free_bitmap_cache(s);
619 
620         brelse(SB_BUFFER_WITH_SB(s));
621 
622         print_statistics(s);
623 
624         if (REISERFS_SB(s)->reserved_blocks != 0) {
625                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
626                                  REISERFS_SB(s)->reserved_blocks);
627         }
628 
629         reiserfs_write_unlock(s);
630         mutex_destroy(&REISERFS_SB(s)->lock);
631         destroy_workqueue(REISERFS_SB(s)->commit_wq);
632         kfree(REISERFS_SB(s)->s_jdev);
633         kfree(s->s_fs_info);
634         s->s_fs_info = NULL;
635 }
636 
637 static struct kmem_cache *reiserfs_inode_cachep;
638 
639 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
640 {
641         struct reiserfs_inode_info *ei;
642         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
643         if (!ei)
644                 return NULL;
645         atomic_set(&ei->openers, 0);
646         mutex_init(&ei->tailpack);
647 #ifdef CONFIG_QUOTA
648         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
649 #endif
650 
651         return &ei->vfs_inode;
652 }
653 
654 static void reiserfs_free_inode(struct inode *inode)
655 {
656         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
657 }
658 
659 static void init_once(void *foo)
660 {
661         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
662 
663         INIT_LIST_HEAD(&ei->i_prealloc_list);
664         inode_init_once(&ei->vfs_inode);
665 }
666 
667 static int __init init_inodecache(void)
668 {
669         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
670                                                   sizeof(struct
671                                                          reiserfs_inode_info),
672                                                   0, (SLAB_RECLAIM_ACCOUNT|
673                                                       SLAB_MEM_SPREAD|
674                                                       SLAB_ACCOUNT),
675                                                   init_once);
676         if (reiserfs_inode_cachep == NULL)
677                 return -ENOMEM;
678         return 0;
679 }
680 
681 static void destroy_inodecache(void)
682 {
683         /*
684          * Make sure all delayed rcu free inodes are flushed before we
685          * destroy cache.
686          */
687         rcu_barrier();
688         kmem_cache_destroy(reiserfs_inode_cachep);
689 }
690 
691 /* we don't mark inodes dirty, we just log them */
692 static void reiserfs_dirty_inode(struct inode *inode, int flags)
693 {
694         struct reiserfs_transaction_handle th;
695 
696         int err = 0;
697 
698         if (sb_rdonly(inode->i_sb)) {
699                 reiserfs_warning(inode->i_sb, "clm-6006",
700                                  "writing inode %lu on readonly FS",
701                                  inode->i_ino);
702                 return;
703         }
704         reiserfs_write_lock(inode->i_sb);
705 
706         /*
707          * this is really only used for atime updates, so they don't have
708          * to be included in O_SYNC or fsync
709          */
710         err = journal_begin(&th, inode->i_sb, 1);
711         if (err)
712                 goto out;
713 
714         reiserfs_update_sd(&th, inode);
715         journal_end(&th);
716 
717 out:
718         reiserfs_write_unlock(inode->i_sb);
719 }
720 
721 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
722 {
723         struct super_block *s = root->d_sb;
724         struct reiserfs_journal *journal = SB_JOURNAL(s);
725         long opts = REISERFS_SB(s)->s_mount_opt;
726 
727         if (opts & (1 << REISERFS_LARGETAIL))
728                 seq_puts(seq, ",tails=on");
729         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
730                 seq_puts(seq, ",notail");
731         /* tails=small is default so we don't show it */
732 
733         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
734                 seq_puts(seq, ",barrier=none");
735         /* barrier=flush is default so we don't show it */
736 
737         if (opts & (1 << REISERFS_ERROR_CONTINUE))
738                 seq_puts(seq, ",errors=continue");
739         else if (opts & (1 << REISERFS_ERROR_PANIC))
740                 seq_puts(seq, ",errors=panic");
741         /* errors=ro is default so we don't show it */
742 
743         if (opts & (1 << REISERFS_DATA_LOG))
744                 seq_puts(seq, ",data=journal");
745         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
746                 seq_puts(seq, ",data=writeback");
747         /* data=ordered is default so we don't show it */
748 
749         if (opts & (1 << REISERFS_ATTRS))
750                 seq_puts(seq, ",attrs");
751 
752         if (opts & (1 << REISERFS_XATTRS_USER))
753                 seq_puts(seq, ",user_xattr");
754 
755         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
756                 seq_puts(seq, ",expose_privroot");
757 
758         if (opts & (1 << REISERFS_POSIXACL))
759                 seq_puts(seq, ",acl");
760 
761         if (REISERFS_SB(s)->s_jdev)
762                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
763 
764         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
765                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
766 
767 #ifdef CONFIG_QUOTA
768         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
769                 seq_show_option(seq, "usrjquota",
770                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
771         else if (opts & (1 << REISERFS_USRQUOTA))
772                 seq_puts(seq, ",usrquota");
773         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
774                 seq_show_option(seq, "grpjquota",
775                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
776         else if (opts & (1 << REISERFS_GRPQUOTA))
777                 seq_puts(seq, ",grpquota");
778         if (REISERFS_SB(s)->s_jquota_fmt) {
779                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
780                         seq_puts(seq, ",jqfmt=vfsold");
781                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
782                         seq_puts(seq, ",jqfmt=vfsv0");
783         }
784 #endif
785 
786         /* Block allocator options */
787         if (opts & (1 << REISERFS_NO_BORDER))
788                 seq_puts(seq, ",block-allocator=noborder");
789         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
790                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
791         if (opts & (1 << REISERFS_HASHED_RELOCATION))
792                 seq_puts(seq, ",block-allocator=hashed_relocation");
793         if (opts & (1 << REISERFS_TEST4))
794                 seq_puts(seq, ",block-allocator=test4");
795         show_alloc_options(seq, s);
796         return 0;
797 }
798 
799 #ifdef CONFIG_QUOTA
800 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
801                                     size_t, loff_t);
802 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
803                                    loff_t);
804 
805 static struct dquot **reiserfs_get_dquots(struct inode *inode)
806 {
807         return REISERFS_I(inode)->i_dquot;
808 }
809 #endif
810 
811 static const struct super_operations reiserfs_sops = {
812         .alloc_inode = reiserfs_alloc_inode,
813         .free_inode = reiserfs_free_inode,
814         .write_inode = reiserfs_write_inode,
815         .dirty_inode = reiserfs_dirty_inode,
816         .evict_inode = reiserfs_evict_inode,
817         .put_super = reiserfs_put_super,
818         .sync_fs = reiserfs_sync_fs,
819         .freeze_fs = reiserfs_freeze,
820         .unfreeze_fs = reiserfs_unfreeze,
821         .statfs = reiserfs_statfs,
822         .remount_fs = reiserfs_remount,
823         .show_options = reiserfs_show_options,
824 #ifdef CONFIG_QUOTA
825         .quota_read = reiserfs_quota_read,
826         .quota_write = reiserfs_quota_write,
827         .get_dquots = reiserfs_get_dquots,
828 #endif
829 };
830 
831 #ifdef CONFIG_QUOTA
832 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
833 
834 static int reiserfs_write_dquot(struct dquot *);
835 static int reiserfs_acquire_dquot(struct dquot *);
836 static int reiserfs_release_dquot(struct dquot *);
837 static int reiserfs_mark_dquot_dirty(struct dquot *);
838 static int reiserfs_write_info(struct super_block *, int);
839 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
840 
841 static const struct dquot_operations reiserfs_quota_operations = {
842         .write_dquot = reiserfs_write_dquot,
843         .acquire_dquot = reiserfs_acquire_dquot,
844         .release_dquot = reiserfs_release_dquot,
845         .mark_dirty = reiserfs_mark_dquot_dirty,
846         .write_info = reiserfs_write_info,
847         .alloc_dquot    = dquot_alloc,
848         .destroy_dquot  = dquot_destroy,
849         .get_next_id    = dquot_get_next_id,
850 };
851 
852 static const struct quotactl_ops reiserfs_qctl_operations = {
853         .quota_on = reiserfs_quota_on,
854         .quota_off = reiserfs_quota_off,
855         .quota_sync = dquot_quota_sync,
856         .get_state = dquot_get_state,
857         .set_info = dquot_set_dqinfo,
858         .get_dqblk = dquot_get_dqblk,
859         .set_dqblk = dquot_set_dqblk,
860 };
861 #endif
862 
863 static const struct export_operations reiserfs_export_ops = {
864         .encode_fh = reiserfs_encode_fh,
865         .fh_to_dentry = reiserfs_fh_to_dentry,
866         .fh_to_parent = reiserfs_fh_to_parent,
867         .get_parent = reiserfs_get_parent,
868 };
869 
870 /*
871  * this struct is used in reiserfs_getopt () for containing the value for
872  * those mount options that have values rather than being toggles.
873  */
874 typedef struct {
875         char *value;
876         /*
877          * bitmask which is to set on mount_options bitmask
878          * when this value is found, 0 is no bits are to be changed.
879          */
880         int setmask;
881         /*
882          * bitmask which is to clear on mount_options bitmask
883          * when this value is found, 0 is no bits are to be changed.
884          * This is applied BEFORE setmask
885          */
886         int clrmask;
887 } arg_desc_t;
888 
889 /* Set this bit in arg_required to allow empty arguments */
890 #define REISERFS_OPT_ALLOWEMPTY 31
891 
892 /*
893  * this struct is used in reiserfs_getopt() for describing the
894  * set of reiserfs mount options
895  */
896 typedef struct {
897         char *option_name;
898 
899         /* 0 if argument is not required, not 0 otherwise */
900         int arg_required;
901 
902         /* list of values accepted by an option */
903         const arg_desc_t *values;
904 
905         /*
906          * bitmask which is to set on mount_options bitmask
907          * when this value is found, 0 is no bits are to be changed.
908          */
909         int setmask;
910 
911         /*
912          * bitmask which is to clear on mount_options bitmask
913          * when this value is found, 0 is no bits are to be changed.
914          * This is applied BEFORE setmask
915          */
916         int clrmask;
917 } opt_desc_t;
918 
919 /* possible values for -o data= */
920 static const arg_desc_t logging_mode[] = {
921         {"ordered", 1 << REISERFS_DATA_ORDERED,
922          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
923         {"journal", 1 << REISERFS_DATA_LOG,
924          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
925         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
926          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
927         {.value = NULL}
928 };
929 
930 /* possible values for -o barrier= */
931 static const arg_desc_t barrier_mode[] = {
932         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
933         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
934         {.value = NULL}
935 };
936 
937 /*
938  * possible values for "-o block-allocator=" and bits which are to be set in
939  * s_mount_opt of reiserfs specific part of in-core super block
940  */
941 static const arg_desc_t balloc[] = {
942         {"noborder", 1 << REISERFS_NO_BORDER, 0},
943         {"border", 0, 1 << REISERFS_NO_BORDER},
944         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
945         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
946         {"test4", 1 << REISERFS_TEST4, 0},
947         {"notest4", 0, 1 << REISERFS_TEST4},
948         {NULL, 0, 0}
949 };
950 
951 static const arg_desc_t tails[] = {
952         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
953         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
954         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
955         {NULL, 0, 0}
956 };
957 
958 static const arg_desc_t error_actions[] = {
959         {"panic", 1 << REISERFS_ERROR_PANIC,
960          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
961         {"ro-remount", 1 << REISERFS_ERROR_RO,
962          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
963 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
964         {"continue", 1 << REISERFS_ERROR_CONTINUE,
965          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
966 #endif
967         {NULL, 0, 0},
968 };
969 
970 /*
971  * proceed only one option from a list *cur - string containing of mount
972  * options
973  * opts - array of options which are accepted
974  * opt_arg - if option is found and requires an argument and if it is specifed
975  * in the input - pointer to the argument is stored here
976  * bit_flags - if option requires to set a certain bit - it is set here
977  * return -1 if unknown option is found, opt->arg_required otherwise
978  */
979 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
980                            char **opt_arg, unsigned long *bit_flags)
981 {
982         char *p;
983         /*
984          * foo=bar,
985          * ^   ^  ^
986          * |   |  +-- option_end
987          * |   +-- arg_start
988          * +-- option_start
989          */
990         const opt_desc_t *opt;
991         const arg_desc_t *arg;
992 
993         p = *cur;
994 
995         /* assume argument cannot contain commas */
996         *cur = strchr(p, ',');
997         if (*cur) {
998                 *(*cur) = '\0';
999                 (*cur)++;
1000         }
1001 
1002         if (!strncmp(p, "alloc=", 6)) {
1003                 /*
1004                  * Ugly special case, probably we should redo options
1005                  * parser so that it can understand several arguments for
1006                  * some options, also so that it can fill several bitfields
1007                  * with option values.
1008                  */
1009                 if (reiserfs_parse_alloc_options(s, p + 6)) {
1010                         return -1;
1011                 } else {
1012                         return 0;
1013                 }
1014         }
1015 
1016         /* for every option in the list */
1017         for (opt = opts; opt->option_name; opt++) {
1018                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1019                         if (bit_flags) {
1020                                 if (opt->clrmask ==
1021                                     (1 << REISERFS_UNSUPPORTED_OPT))
1022                                         reiserfs_warning(s, "super-6500",
1023                                                          "%s not supported.\n",
1024                                                          p);
1025                                 else
1026                                         *bit_flags &= ~opt->clrmask;
1027                                 if (opt->setmask ==
1028                                     (1 << REISERFS_UNSUPPORTED_OPT))
1029                                         reiserfs_warning(s, "super-6501",
1030                                                          "%s not supported.\n",
1031                                                          p);
1032                                 else
1033                                         *bit_flags |= opt->setmask;
1034                         }
1035                         break;
1036                 }
1037         }
1038         if (!opt->option_name) {
1039                 reiserfs_warning(s, "super-6502",
1040                                  "unknown mount option \"%s\"", p);
1041                 return -1;
1042         }
1043 
1044         p += strlen(opt->option_name);
1045         switch (*p) {
1046         case '=':
1047                 if (!opt->arg_required) {
1048                         reiserfs_warning(s, "super-6503",
1049                                          "the option \"%s\" does not "
1050                                          "require an argument\n",
1051                                          opt->option_name);
1052                         return -1;
1053                 }
1054                 break;
1055 
1056         case 0:
1057                 if (opt->arg_required) {
1058                         reiserfs_warning(s, "super-6504",
1059                                          "the option \"%s\" requires an "
1060                                          "argument\n", opt->option_name);
1061                         return -1;
1062                 }
1063                 break;
1064         default:
1065                 reiserfs_warning(s, "super-6505",
1066                                  "head of option \"%s\" is only correct\n",
1067                                  opt->option_name);
1068                 return -1;
1069         }
1070 
1071         /*
1072          * move to the argument, or to next option if argument is not
1073          * required
1074          */
1075         p++;
1076 
1077         if (opt->arg_required
1078             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1079             && !strlen(p)) {
1080                 /* this catches "option=," if not allowed */
1081                 reiserfs_warning(s, "super-6506",
1082                                  "empty argument for \"%s\"\n",
1083                                  opt->option_name);
1084                 return -1;
1085         }
1086 
1087         if (!opt->values) {
1088                 /* *=NULLopt_arg contains pointer to argument */
1089                 *opt_arg = p;
1090                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1091         }
1092 
1093         /* values possible for this option are listed in opt->values */
1094         for (arg = opt->values; arg->value; arg++) {
1095                 if (!strcmp(p, arg->value)) {
1096                         if (bit_flags) {
1097                                 *bit_flags &= ~arg->clrmask;
1098                                 *bit_flags |= arg->setmask;
1099                         }
1100                         return opt->arg_required;
1101                 }
1102         }
1103 
1104         reiserfs_warning(s, "super-6506",
1105                          "bad value \"%s\" for option \"%s\"\n", p,
1106                          opt->option_name);
1107         return -1;
1108 }
1109 
1110 /* returns 0 if something is wrong in option string, 1 - otherwise */
1111 static int reiserfs_parse_options(struct super_block *s,
1112 
1113                                   /* string given via mount's -o */
1114                                   char *options,
1115 
1116                                   /*
1117                                    * after the parsing phase, contains the
1118                                    * collection of bitflags defining what
1119                                    * mount options were selected.
1120                                    */
1121                                   unsigned long *mount_options,
1122 
1123                                   /* strtol-ed from NNN of resize=NNN */
1124                                   unsigned long *blocks,
1125                                   char **jdev_name,
1126                                   unsigned int *commit_max_age,
1127                                   char **qf_names,
1128                                   unsigned int *qfmt)
1129 {
1130         int c;
1131         char *arg = NULL;
1132         char *pos;
1133         opt_desc_t opts[] = {
1134                 /*
1135                  * Compatibility stuff, so that -o notail for old
1136                  * setups still work
1137                  */
1138                 {"tails",.arg_required = 't',.values = tails},
1139                 {"notail",.clrmask =
1140                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1141                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1142                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1143                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1144                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1145 #ifdef CONFIG_REISERFS_FS_XATTR
1146                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1147                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1148 #else
1149                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1150                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1151 #endif
1152 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1153                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1154                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1155 #else
1156                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1157                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1158 #endif
1159                 {.option_name = "nolog"},
1160                 {"replayonly",.setmask = 1 << REPLAYONLY},
1161                 {"block-allocator",.arg_required = 'a',.values = balloc},
1162                 {"data",.arg_required = 'd',.values = logging_mode},
1163                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1164                 {"resize",.arg_required = 'r',.values = NULL},
1165                 {"jdev",.arg_required = 'j',.values = NULL},
1166                 {"nolargeio",.arg_required = 'w',.values = NULL},
1167                 {"commit",.arg_required = 'c',.values = NULL},
1168                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1169                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1170                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1171                 {"errors",.arg_required = 'e',.values = error_actions},
1172                 {"usrjquota",.arg_required =
1173                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1174                 {"grpjquota",.arg_required =
1175                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1176                 {"jqfmt",.arg_required = 'f',.values = NULL},
1177                 {.option_name = NULL}
1178         };
1179 
1180         *blocks = 0;
1181         if (!options || !*options)
1182                 /*
1183                  * use default configuration: create tails, journaling on, no
1184                  * conversion to newest format
1185                  */
1186                 return 1;
1187 
1188         for (pos = options; pos;) {
1189                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1190                 if (c == -1)
1191                         /* wrong option is given */
1192                         return 0;
1193 
1194                 if (c == 'r') {
1195                         char *p;
1196 
1197                         p = NULL;
1198                         /* "resize=NNN" or "resize=auto" */
1199 
1200                         if (!strcmp(arg, "auto")) {
1201                                 /* From JFS code, to auto-get the size. */
1202                                 *blocks =
1203                                     i_size_read(s->s_bdev->bd_inode) >> s->
1204                                     s_blocksize_bits;
1205                         } else {
1206                                 *blocks = simple_strtoul(arg, &p, 0);
1207                                 if (*p != '\0') {
1208                                         /* NNN does not look like a number */
1209                                         reiserfs_warning(s, "super-6507",
1210                                                          "bad value %s for "
1211                                                          "-oresize\n", arg);
1212                                         return 0;
1213                                 }
1214                         }
1215                 }
1216 
1217                 if (c == 'c') {
1218                         char *p = NULL;
1219                         unsigned long val = simple_strtoul(arg, &p, 0);
1220                         /* commit=NNN (time in seconds) */
1221                         if (*p != '\0' || val >= (unsigned int)-1) {
1222                                 reiserfs_warning(s, "super-6508",
1223                                                  "bad value %s for -ocommit\n",
1224                                                  arg);
1225                                 return 0;
1226                         }
1227                         *commit_max_age = (unsigned int)val;
1228                 }
1229 
1230                 if (c == 'w') {
1231                         reiserfs_warning(s, "super-6509", "nolargeio option "
1232                                          "is no longer supported");
1233                         return 0;
1234                 }
1235 
1236                 if (c == 'j') {
1237                         if (arg && *arg && jdev_name) {
1238                                 /* Hm, already assigned? */
1239                                 if (*jdev_name) {
1240                                         reiserfs_warning(s, "super-6510",
1241                                                          "journal device was "
1242                                                          "already specified to "
1243                                                          "be %s", *jdev_name);
1244                                         return 0;
1245                                 }
1246                                 *jdev_name = arg;
1247                         }
1248                 }
1249 #ifdef CONFIG_QUOTA
1250                 if (c == 'u' || c == 'g') {
1251                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1252 
1253                         if (sb_any_quota_loaded(s) &&
1254                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1255                                 reiserfs_warning(s, "super-6511",
1256                                                  "cannot change journaled "
1257                                                  "quota options when quota "
1258                                                  "turned on.");
1259                                 return 0;
1260                         }
1261                         if (qf_names[qtype] !=
1262                             REISERFS_SB(s)->s_qf_names[qtype])
1263                                 kfree(qf_names[qtype]);
1264                         qf_names[qtype] = NULL;
1265                         if (*arg) {     /* Some filename specified? */
1266                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1267                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1268                                               arg)) {
1269                                         reiserfs_warning(s, "super-6512",
1270                                                          "%s quota file "
1271                                                          "already specified.",
1272                                                          QTYPE2NAME(qtype));
1273                                         return 0;
1274                                 }
1275                                 if (strchr(arg, '/')) {
1276                                         reiserfs_warning(s, "super-6513",
1277                                                          "quotafile must be "
1278                                                          "on filesystem root.");
1279                                         return 0;
1280                                 }
1281                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1282                                 if (!qf_names[qtype]) {
1283                                         reiserfs_warning(s, "reiserfs-2502",
1284                                                          "not enough memory "
1285                                                          "for storing "
1286                                                          "quotafile name.");
1287                                         return 0;
1288                                 }
1289                                 if (qtype == USRQUOTA)
1290                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1291                                 else
1292                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1293                         } else {
1294                                 if (qtype == USRQUOTA)
1295                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1296                                 else
1297                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1298                         }
1299                 }
1300                 if (c == 'f') {
1301                         if (!strcmp(arg, "vfsold"))
1302                                 *qfmt = QFMT_VFS_OLD;
1303                         else if (!strcmp(arg, "vfsv0"))
1304                                 *qfmt = QFMT_VFS_V0;
1305                         else {
1306                                 reiserfs_warning(s, "super-6514",
1307                                                  "unknown quota format "
1308                                                  "specified.");
1309                                 return 0;
1310                         }
1311                         if (sb_any_quota_loaded(s) &&
1312                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1313                                 reiserfs_warning(s, "super-6515",
1314                                                  "cannot change journaled "
1315                                                  "quota options when quota "
1316                                                  "turned on.");
1317                                 return 0;
1318                         }
1319                 }
1320 #else
1321                 if (c == 'u' || c == 'g' || c == 'f') {
1322                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1323                                          "quota options not supported.");
1324                         return 0;
1325                 }
1326 #endif
1327         }
1328 
1329 #ifdef CONFIG_QUOTA
1330         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1331             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1332                 reiserfs_warning(s, "super-6515",
1333                                  "journaled quota format not specified.");
1334                 return 0;
1335         }
1336         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1337                sb_has_quota_loaded(s, USRQUOTA)) ||
1338             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1339                sb_has_quota_loaded(s, GRPQUOTA))) {
1340                 reiserfs_warning(s, "super-6516", "quota options must "
1341                                  "be present when quota is turned on.");
1342                 return 0;
1343         }
1344 #endif
1345 
1346         return 1;
1347 }
1348 
1349 static void switch_data_mode(struct super_block *s, unsigned long mode)
1350 {
1351         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1352                                          (1 << REISERFS_DATA_ORDERED) |
1353                                          (1 << REISERFS_DATA_WRITEBACK));
1354         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1355 }
1356 
1357 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1358 {
1359         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1360                 if (!reiserfs_data_log(s)) {
1361                         switch_data_mode(s, REISERFS_DATA_LOG);
1362                         reiserfs_info(s, "switching to journaled data mode\n");
1363                 }
1364         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1365                 if (!reiserfs_data_ordered(s)) {
1366                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1367                         reiserfs_info(s, "switching to ordered data mode\n");
1368                 }
1369         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1370                 if (!reiserfs_data_writeback(s)) {
1371                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1372                         reiserfs_info(s, "switching to writeback data mode\n");
1373                 }
1374         }
1375 }
1376 
1377 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1378 {
1379         int flush = (1 << REISERFS_BARRIER_FLUSH);
1380         int none = (1 << REISERFS_BARRIER_NONE);
1381         int all_barrier = flush | none;
1382 
1383         if (bits & all_barrier) {
1384                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1385                 if (bits & flush) {
1386                         REISERFS_SB(s)->s_mount_opt |= flush;
1387                         printk("reiserfs: enabling write barrier flush mode\n");
1388                 } else if (bits & none) {
1389                         REISERFS_SB(s)->s_mount_opt |= none;
1390                         printk("reiserfs: write barriers turned off\n");
1391                 }
1392         }
1393 }
1394 
1395 static void handle_attrs(struct super_block *s)
1396 {
1397         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1398 
1399         if (reiserfs_attrs(s)) {
1400                 if (old_format_only(s)) {
1401                         reiserfs_warning(s, "super-6517", "cannot support "
1402                                          "attributes on 3.5.x disk format");
1403                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1404                         return;
1405                 }
1406                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1407                         reiserfs_warning(s, "super-6518", "cannot support "
1408                                          "attributes until flag is set in "
1409                                          "super-block");
1410                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1411                 }
1412         }
1413 }
1414 
1415 #ifdef CONFIG_QUOTA
1416 static void handle_quota_files(struct super_block *s, char **qf_names,
1417                                unsigned int *qfmt)
1418 {
1419         int i;
1420 
1421         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1422                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1423                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1424                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1425         }
1426         if (*qfmt)
1427                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1428 }
1429 #endif
1430 
1431 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1432 {
1433         struct reiserfs_super_block *rs;
1434         struct reiserfs_transaction_handle th;
1435         unsigned long blocks;
1436         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1437         unsigned long safe_mask = 0;
1438         unsigned int commit_max_age = (unsigned int)-1;
1439         struct reiserfs_journal *journal = SB_JOURNAL(s);
1440         char *new_opts;
1441         int err;
1442         char *qf_names[REISERFS_MAXQUOTAS];
1443         unsigned int qfmt = 0;
1444 #ifdef CONFIG_QUOTA
1445         int i;
1446 #endif
1447 
1448         new_opts = kstrdup(arg, GFP_KERNEL);
1449         if (arg && !new_opts)
1450                 return -ENOMEM;
1451 
1452         sync_filesystem(s);
1453         reiserfs_write_lock(s);
1454 
1455 #ifdef CONFIG_QUOTA
1456         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1457 #endif
1458 
1459         rs = SB_DISK_SUPER_BLOCK(s);
1460 
1461         if (!reiserfs_parse_options
1462             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1463             qf_names, &qfmt)) {
1464 #ifdef CONFIG_QUOTA
1465                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1466                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1467                                 kfree(qf_names[i]);
1468 #endif
1469                 err = -EINVAL;
1470                 goto out_err_unlock;
1471         }
1472 #ifdef CONFIG_QUOTA
1473         handle_quota_files(s, qf_names, &qfmt);
1474 #endif
1475 
1476         handle_attrs(s);
1477 
1478         /* Add options that are safe here */
1479         safe_mask |= 1 << REISERFS_SMALLTAIL;
1480         safe_mask |= 1 << REISERFS_LARGETAIL;
1481         safe_mask |= 1 << REISERFS_NO_BORDER;
1482         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1483         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1484         safe_mask |= 1 << REISERFS_TEST4;
1485         safe_mask |= 1 << REISERFS_ATTRS;
1486         safe_mask |= 1 << REISERFS_XATTRS_USER;
1487         safe_mask |= 1 << REISERFS_POSIXACL;
1488         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1489         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1490         safe_mask |= 1 << REISERFS_ERROR_RO;
1491         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1492         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1493         safe_mask |= 1 << REISERFS_USRQUOTA;
1494         safe_mask |= 1 << REISERFS_GRPQUOTA;
1495 
1496         /*
1497          * Update the bitmask, taking care to keep
1498          * the bits we're not allowed to change here
1499          */
1500         REISERFS_SB(s)->s_mount_opt =
1501             (REISERFS_SB(s)->
1502              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1503 
1504         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1505                 journal->j_max_commit_age = commit_max_age;
1506                 journal->j_max_trans_age = commit_max_age;
1507         } else if (commit_max_age == 0) {
1508                 /* 0 means restore defaults. */
1509                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1510                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1511         }
1512 
1513         if (blocks) {
1514                 err = reiserfs_resize(s, blocks);
1515                 if (err != 0)
1516                         goto out_err_unlock;
1517         }
1518 
1519         if (*mount_flags & SB_RDONLY) {
1520                 reiserfs_write_unlock(s);
1521                 reiserfs_xattr_init(s, *mount_flags);
1522                 /* remount read-only */
1523                 if (sb_rdonly(s))
1524                         /* it is read-only already */
1525                         goto out_ok_unlocked;
1526 
1527                 err = dquot_suspend(s, -1);
1528                 if (err < 0)
1529                         goto out_err;
1530 
1531                 /* try to remount file system with read-only permissions */
1532                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1533                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1534                         goto out_ok_unlocked;
1535                 }
1536 
1537                 reiserfs_write_lock(s);
1538 
1539                 err = journal_begin(&th, s, 10);
1540                 if (err)
1541                         goto out_err_unlock;
1542 
1543                 /* Mounting a rw partition read-only. */
1544                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1545                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1546                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1547         } else {
1548                 /* remount read-write */
1549                 if (!sb_rdonly(s)) {
1550                         reiserfs_write_unlock(s);
1551                         reiserfs_xattr_init(s, *mount_flags);
1552                         goto out_ok_unlocked;   /* We are read-write already */
1553                 }
1554 
1555                 if (reiserfs_is_journal_aborted(journal)) {
1556                         err = journal->j_errno;
1557                         goto out_err_unlock;
1558                 }
1559 
1560                 handle_data_mode(s, mount_options);
1561                 handle_barrier_mode(s, mount_options);
1562                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1563 
1564                 /* now it is safe to call journal_begin */
1565                 s->s_flags &= ~SB_RDONLY;
1566                 err = journal_begin(&th, s, 10);
1567                 if (err)
1568                         goto out_err_unlock;
1569 
1570                 /* Mount a partition which is read-only, read-write */
1571                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1572                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1573                 s->s_flags &= ~SB_RDONLY;
1574                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1575                 if (!old_format_only(s))
1576                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1577                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1578                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1579                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1580         }
1581         /* this will force a full flush of all journal lists */
1582         SB_JOURNAL(s)->j_must_wait = 1;
1583         err = journal_end(&th);
1584         if (err)
1585                 goto out_err_unlock;
1586 
1587         reiserfs_write_unlock(s);
1588         if (!(*mount_flags & SB_RDONLY)) {
1589                 dquot_resume(s, -1);
1590                 reiserfs_write_lock(s);
1591                 finish_unfinished(s);
1592                 reiserfs_write_unlock(s);
1593                 reiserfs_xattr_init(s, *mount_flags);
1594         }
1595 
1596 out_ok_unlocked:
1597         return 0;
1598 
1599 out_err_unlock:
1600         reiserfs_write_unlock(s);
1601 out_err:
1602         kfree(new_opts);
1603         return err;
1604 }
1605 
1606 static int read_super_block(struct super_block *s, int offset)
1607 {
1608         struct buffer_head *bh;
1609         struct reiserfs_super_block *rs;
1610         int fs_blocksize;
1611 
1612         bh = sb_bread(s, offset / s->s_blocksize);
1613         if (!bh) {
1614                 reiserfs_warning(s, "sh-2006",
1615                                  "bread failed (dev %s, block %lu, size %lu)",
1616                                  s->s_id, offset / s->s_blocksize,
1617                                  s->s_blocksize);
1618                 return 1;
1619         }
1620 
1621         rs = (struct reiserfs_super_block *)bh->b_data;
1622         if (!is_any_reiserfs_magic_string(rs)) {
1623                 brelse(bh);
1624                 return 1;
1625         }
1626         /*
1627          * ok, reiserfs signature (old or new) found in at the given offset
1628          */
1629         fs_blocksize = sb_blocksize(rs);
1630         brelse(bh);
1631         sb_set_blocksize(s, fs_blocksize);
1632 
1633         bh = sb_bread(s, offset / s->s_blocksize);
1634         if (!bh) {
1635                 reiserfs_warning(s, "sh-2007",
1636                                  "bread failed (dev %s, block %lu, size %lu)",
1637                                  s->s_id, offset / s->s_blocksize,
1638                                  s->s_blocksize);
1639                 return 1;
1640         }
1641 
1642         rs = (struct reiserfs_super_block *)bh->b_data;
1643         if (sb_blocksize(rs) != s->s_blocksize) {
1644                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1645                                  "filesystem on (dev %s, block %llu, size %lu)",
1646                                  s->s_id,
1647                                  (unsigned long long)bh->b_blocknr,
1648                                  s->s_blocksize);
1649                 brelse(bh);
1650                 return 1;
1651         }
1652 
1653         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1654                 brelse(bh);
1655                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1656                                  "--rebuild-tree run detected. Please run\n"
1657                                  "reiserfsck --rebuild-tree and wait for a "
1658                                  "completion. If that fails\n"
1659                                  "get newer reiserfsprogs package");
1660                 return 1;
1661         }
1662 
1663         SB_BUFFER_WITH_SB(s) = bh;
1664         SB_DISK_SUPER_BLOCK(s) = rs;
1665 
1666         /*
1667          * magic is of non-standard journal filesystem, look at s_version to
1668          * find which format is in use
1669          */
1670         if (is_reiserfs_jr(rs)) {
1671                 if (sb_version(rs) == REISERFS_VERSION_2)
1672                         reiserfs_info(s, "found reiserfs format \"3.6\""
1673                                       " with non-standard journal\n");
1674                 else if (sb_version(rs) == REISERFS_VERSION_1)
1675                         reiserfs_info(s, "found reiserfs format \"3.5\""
1676                                       " with non-standard journal\n");
1677                 else {
1678                         reiserfs_warning(s, "sh-2012", "found unknown "
1679                                          "format \"%u\" of reiserfs with "
1680                                          "non-standard magic", sb_version(rs));
1681                         return 1;
1682                 }
1683         } else
1684                 /*
1685                  * s_version of standard format may contain incorrect
1686                  * information, so we just look at the magic string
1687                  */
1688                 reiserfs_info(s,
1689                               "found reiserfs format \"%s\" with standard journal\n",
1690                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1691 
1692         s->s_op = &reiserfs_sops;
1693         s->s_export_op = &reiserfs_export_ops;
1694 #ifdef CONFIG_QUOTA
1695         s->s_qcop = &reiserfs_qctl_operations;
1696         s->dq_op = &reiserfs_quota_operations;
1697         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1698 #endif
1699 
1700         /*
1701          * new format is limited by the 32 bit wide i_blocks field, want to
1702          * be one full block below that.
1703          */
1704         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1705         return 0;
1706 }
1707 
1708 /* after journal replay, reread all bitmap and super blocks */
1709 static int reread_meta_blocks(struct super_block *s)
1710 {
1711         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1712         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1713         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1714                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1715                 return 1;
1716         }
1717 
1718         return 0;
1719 }
1720 
1721 /* hash detection stuff */
1722 
1723 /*
1724  * if root directory is empty - we set default - Yura's - hash and
1725  * warn about it
1726  * FIXME: we look for only one name in a directory. If tea and yura
1727  * both have the same value - we ask user to send report to the
1728  * mailing list
1729  */
1730 static __u32 find_hash_out(struct super_block *s)
1731 {
1732         int retval;
1733         struct inode *inode;
1734         struct cpu_key key;
1735         INITIALIZE_PATH(path);
1736         struct reiserfs_dir_entry de;
1737         struct reiserfs_de_head *deh;
1738         __u32 hash = DEFAULT_HASH;
1739         __u32 deh_hashval, teahash, r5hash, yurahash;
1740 
1741         inode = d_inode(s->s_root);
1742 
1743         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1744         retval = search_by_entry_key(s, &key, &path, &de);
1745         if (retval == IO_ERROR) {
1746                 pathrelse(&path);
1747                 return UNSET_HASH;
1748         }
1749         if (retval == NAME_NOT_FOUND)
1750                 de.de_entry_num--;
1751 
1752         set_de_name_and_namelen(&de);
1753         deh = de.de_deh + de.de_entry_num;
1754 
1755         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1756                 /* allow override in this case */
1757                 if (reiserfs_rupasov_hash(s))
1758                         hash = YURA_HASH;
1759                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1760                 goto out;
1761         }
1762 
1763         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1764         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1765         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1766         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1767 
1768         if ((teahash == r5hash && deh_hashval == r5hash) ||
1769             (teahash == yurahash && deh_hashval == yurahash) ||
1770             (r5hash == yurahash && deh_hashval == yurahash)) {
1771                 reiserfs_warning(s, "reiserfs-2506",
1772                                  "Unable to automatically detect hash "
1773                                  "function. Please mount with -o "
1774                                  "hash={tea,rupasov,r5}");
1775                 hash = UNSET_HASH;
1776                 goto out;
1777         }
1778 
1779         if (deh_hashval == yurahash)
1780                 hash = YURA_HASH;
1781         else if (deh_hashval == teahash)
1782                 hash = TEA_HASH;
1783         else if (deh_hashval == r5hash)
1784                 hash = R5_HASH;
1785         else {
1786                 reiserfs_warning(s, "reiserfs-2506",
1787                                  "Unrecognised hash function");
1788                 hash = UNSET_HASH;
1789         }
1790 out:
1791         pathrelse(&path);
1792         return hash;
1793 }
1794 
1795 /* finds out which hash names are sorted with */
1796 static int what_hash(struct super_block *s)
1797 {
1798         __u32 code;
1799 
1800         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1801 
1802         /*
1803          * reiserfs_hash_detect() == true if any of the hash mount options
1804          * were used.  We must check them to make sure the user isn't
1805          * using a bad hash value
1806          */
1807         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1808                 code = find_hash_out(s);
1809 
1810         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1811                 /*
1812                  * detection has found the hash, and we must check against the
1813                  * mount options
1814                  */
1815                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1816                         reiserfs_warning(s, "reiserfs-2507",
1817                                          "Error, %s hash detected, "
1818                                          "unable to force rupasov hash",
1819                                          reiserfs_hashname(code));
1820                         code = UNSET_HASH;
1821                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1822                         reiserfs_warning(s, "reiserfs-2508",
1823                                          "Error, %s hash detected, "
1824                                          "unable to force tea hash",
1825                                          reiserfs_hashname(code));
1826                         code = UNSET_HASH;
1827                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1828                         reiserfs_warning(s, "reiserfs-2509",
1829                                          "Error, %s hash detected, "
1830                                          "unable to force r5 hash",
1831                                          reiserfs_hashname(code));
1832                         code = UNSET_HASH;
1833                 }
1834         } else {
1835                 /*
1836                  * find_hash_out was not called or
1837                  * could not determine the hash
1838                  */
1839                 if (reiserfs_rupasov_hash(s)) {
1840                         code = YURA_HASH;
1841                 } else if (reiserfs_tea_hash(s)) {
1842                         code = TEA_HASH;
1843                 } else if (reiserfs_r5_hash(s)) {
1844                         code = R5_HASH;
1845                 }
1846         }
1847 
1848         /*
1849          * if we are mounted RW, and we have a new valid hash code, update
1850          * the super
1851          */
1852         if (code != UNSET_HASH &&
1853             !sb_rdonly(s) &&
1854             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1855                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1856         }
1857         return code;
1858 }
1859 
1860 /* return pointer to appropriate function */
1861 static hashf_t hash_function(struct super_block *s)
1862 {
1863         switch (what_hash(s)) {
1864         case TEA_HASH:
1865                 reiserfs_info(s, "Using tea hash to sort names\n");
1866                 return keyed_hash;
1867         case YURA_HASH:
1868                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1869                 return yura_hash;
1870         case R5_HASH:
1871                 reiserfs_info(s, "Using r5 hash to sort names\n");
1872                 return r5_hash;
1873         }
1874         return NULL;
1875 }
1876 
1877 /* this is used to set up correct value for old partitions */
1878 static int function2code(hashf_t func)
1879 {
1880         if (func == keyed_hash)
1881                 return TEA_HASH;
1882         if (func == yura_hash)
1883                 return YURA_HASH;
1884         if (func == r5_hash)
1885                 return R5_HASH;
1886 
1887         BUG();                  /* should never happen */
1888 
1889         return 0;
1890 }
1891 
1892 #define SWARN(silent, s, id, ...)                       \
1893         if (!(silent))                          \
1894                 reiserfs_warning(s, id, __VA_ARGS__)
1895 
1896 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1897 {
1898         struct inode *root_inode;
1899         struct reiserfs_transaction_handle th;
1900         int old_format = 0;
1901         unsigned long blocks;
1902         unsigned int commit_max_age = 0;
1903         int jinit_done = 0;
1904         struct reiserfs_iget_args args;
1905         struct reiserfs_super_block *rs;
1906         char *jdev_name;
1907         struct reiserfs_sb_info *sbi;
1908         int errval = -EINVAL;
1909         char *qf_names[REISERFS_MAXQUOTAS] = {};
1910         unsigned int qfmt = 0;
1911 
1912         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1913         if (!sbi)
1914                 return -ENOMEM;
1915         s->s_fs_info = sbi;
1916         /* Set default values for options: non-aggressive tails, RO on errors */
1917         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1918         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1919         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1920         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1921         sbi->s_alloc_options.preallocmin = 0;
1922         /* Preallocate by 16 blocks (17-1) at once */
1923         sbi->s_alloc_options.preallocsize = 17;
1924         /* setup default block allocator options */
1925         reiserfs_init_alloc_options(s);
1926 
1927         spin_lock_init(&sbi->old_work_lock);
1928         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1929         mutex_init(&sbi->lock);
1930         sbi->lock_depth = -1;
1931 
1932         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1933                                          s->s_id);
1934         if (!sbi->commit_wq) {
1935                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1936                 errval = -ENOMEM;
1937                 goto error_unlocked;
1938         }
1939 
1940         jdev_name = NULL;
1941         if (reiserfs_parse_options
1942             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1943              &commit_max_age, qf_names, &qfmt) == 0) {
1944                 goto error_unlocked;
1945         }
1946         if (jdev_name && jdev_name[0]) {
1947                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1948                 if (!sbi->s_jdev) {
1949                         SWARN(silent, s, "", "Cannot allocate memory for "
1950                                 "journal device name");
1951                         goto error_unlocked;
1952                 }
1953         }
1954 #ifdef CONFIG_QUOTA
1955         handle_quota_files(s, qf_names, &qfmt);
1956 #endif
1957 
1958         if (blocks) {
1959                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1960                 goto error_unlocked;
1961         }
1962 
1963         /*
1964          * try old format (undistributed bitmap, super block in 8-th 1k
1965          * block of a device)
1966          */
1967         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1968                 old_format = 1;
1969 
1970         /*
1971          * try new format (64-th 1k block), which can contain reiserfs
1972          * super block
1973          */
1974         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1975                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1976                       s->s_id);
1977                 goto error_unlocked;
1978         }
1979 
1980         s->s_time_min = 0;
1981         s->s_time_max = U32_MAX;
1982 
1983         rs = SB_DISK_SUPER_BLOCK(s);
1984         /*
1985          * Let's do basic sanity check to verify that underlying device is not
1986          * smaller than the filesystem. If the check fails then abort and
1987          * scream, because bad stuff will happen otherwise.
1988          */
1989         if (s->s_bdev && s->s_bdev->bd_inode
1990             && i_size_read(s->s_bdev->bd_inode) <
1991             sb_block_count(rs) * sb_blocksize(rs)) {
1992                 SWARN(silent, s, "", "Filesystem cannot be "
1993                       "mounted because it is bigger than the device");
1994                 SWARN(silent, s, "", "You may need to run fsck "
1995                       "or increase size of your LVM partition");
1996                 SWARN(silent, s, "", "Or may be you forgot to "
1997                       "reboot after fdisk when it told you to");
1998                 goto error_unlocked;
1999         }
2000 
2001         sbi->s_mount_state = SB_REISERFS_STATE(s);
2002         sbi->s_mount_state = REISERFS_VALID_FS;
2003 
2004         if ((errval = reiserfs_init_bitmap_cache(s))) {
2005                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2006                 goto error_unlocked;
2007         }
2008 
2009         errval = -EINVAL;
2010 #ifdef CONFIG_REISERFS_CHECK
2011         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2012         SWARN(silent, s, "", "- it is slow mode for debugging.");
2013 #endif
2014 
2015         /* make data=ordered the default */
2016         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2017             !reiserfs_data_writeback(s)) {
2018                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2019         }
2020 
2021         if (reiserfs_data_log(s)) {
2022                 reiserfs_info(s, "using journaled data mode\n");
2023         } else if (reiserfs_data_ordered(s)) {
2024                 reiserfs_info(s, "using ordered data mode\n");
2025         } else {
2026                 reiserfs_info(s, "using writeback data mode\n");
2027         }
2028         if (reiserfs_barrier_flush(s)) {
2029                 printk("reiserfs: using flush barriers\n");
2030         }
2031 
2032         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2033                 SWARN(silent, s, "sh-2022",
2034                       "unable to initialize journal space");
2035                 goto error_unlocked;
2036         } else {
2037                 /*
2038                  * once this is set, journal_release must be called
2039                  * if we error out of the mount
2040                  */
2041                 jinit_done = 1;
2042         }
2043 
2044         if (reread_meta_blocks(s)) {
2045                 SWARN(silent, s, "jmacd-9",
2046                       "unable to reread meta blocks after journal init");
2047                 goto error_unlocked;
2048         }
2049 
2050         if (replay_only(s))
2051                 goto error_unlocked;
2052 
2053         s->s_xattr = reiserfs_xattr_handlers;
2054 
2055         if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2056                 SWARN(silent, s, "clm-7000",
2057                       "Detected readonly device, marking FS readonly");
2058                 s->s_flags |= SB_RDONLY;
2059         }
2060         args.objectid = REISERFS_ROOT_OBJECTID;
2061         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2062         root_inode =
2063             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2064                          reiserfs_init_locked_inode, (void *)&args);
2065         if (!root_inode) {
2066                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2067                 goto error_unlocked;
2068         }
2069 
2070         /*
2071          * This path assumed to be called with the BKL in the old times.
2072          * Now we have inherited the big reiserfs lock from it and many
2073          * reiserfs helpers called in the mount path and elsewhere require
2074          * this lock to be held even if it's not always necessary. Let's be
2075          * conservative and hold it early. The window can be reduced after
2076          * careful review of the code.
2077          */
2078         reiserfs_write_lock(s);
2079 
2080         if (root_inode->i_state & I_NEW) {
2081                 reiserfs_read_locked_inode(root_inode, &args);
2082                 unlock_new_inode(root_inode);
2083         }
2084 
2085         s->s_root = d_make_root(root_inode);
2086         if (!s->s_root)
2087                 goto error;
2088         /* define and initialize hash function */
2089         sbi->s_hash_function = hash_function(s);
2090         if (sbi->s_hash_function == NULL) {
2091                 dput(s->s_root);
2092                 s->s_root = NULL;
2093                 goto error;
2094         }
2095 
2096         if (is_reiserfs_3_5(rs)
2097             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2098                 set_bit(REISERFS_3_5, &sbi->s_properties);
2099         else if (old_format)
2100                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2101         else
2102                 set_bit(REISERFS_3_6, &sbi->s_properties);
2103 
2104         if (!sb_rdonly(s)) {
2105 
2106                 errval = journal_begin(&th, s, 1);
2107                 if (errval) {
2108                         dput(s->s_root);
2109                         s->s_root = NULL;
2110                         goto error;
2111                 }
2112                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2113 
2114                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2115                 set_sb_fs_state(rs, 0);
2116 
2117                 /*
2118                  * Clear out s_bmap_nr if it would wrap. We can handle this
2119                  * case, but older revisions can't. This will cause the
2120                  * file system to fail mount on those older implementations,
2121                  * avoiding corruption. -jeffm
2122                  */
2123                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2124                     sb_bmap_nr(rs) != 0) {
2125                         reiserfs_warning(s, "super-2030", "This file system "
2126                                         "claims to use %u bitmap blocks in "
2127                                         "its super block, but requires %u. "
2128                                         "Clearing to zero.", sb_bmap_nr(rs),
2129                                         reiserfs_bmap_count(s));
2130 
2131                         set_sb_bmap_nr(rs, 0);
2132                 }
2133 
2134                 if (old_format_only(s)) {
2135                         /*
2136                          * filesystem of format 3.5 either with standard
2137                          * or non-standard journal
2138                          */
2139                         if (convert_reiserfs(s)) {
2140                                 /* and -o conv is given */
2141                                 if (!silent)
2142                                         reiserfs_info(s,
2143                                                       "converting 3.5 filesystem to the 3.6 format");
2144 
2145                                 if (is_reiserfs_3_5(rs))
2146                                         /*
2147                                          * put magic string of 3.6 format.
2148                                          * 2.2 will not be able to
2149                                          * mount this filesystem anymore
2150                                          */
2151                                         memcpy(rs->s_v1.s_magic,
2152                                                reiserfs_3_6_magic_string,
2153                                                sizeof
2154                                                (reiserfs_3_6_magic_string));
2155 
2156                                 set_sb_version(rs, REISERFS_VERSION_2);
2157                                 reiserfs_convert_objectid_map_v1(s);
2158                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2159                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2160                         } else if (!silent) {
2161                                 reiserfs_info(s, "using 3.5.x disk format\n");
2162                         }
2163                 } else
2164                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2165 
2166 
2167                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2168                 errval = journal_end(&th);
2169                 if (errval) {
2170                         dput(s->s_root);
2171                         s->s_root = NULL;
2172                         goto error;
2173                 }
2174 
2175                 reiserfs_write_unlock(s);
2176                 if ((errval = reiserfs_lookup_privroot(s)) ||
2177                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2178                         dput(s->s_root);
2179                         s->s_root = NULL;
2180                         goto error_unlocked;
2181                 }
2182                 reiserfs_write_lock(s);
2183 
2184                 /*
2185                  * look for files which were to be removed in previous session
2186                  */
2187                 finish_unfinished(s);
2188         } else {
2189                 if (old_format_only(s) && !silent) {
2190                         reiserfs_info(s, "using 3.5.x disk format\n");
2191                 }
2192 
2193                 reiserfs_write_unlock(s);
2194                 if ((errval = reiserfs_lookup_privroot(s)) ||
2195                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2196                         dput(s->s_root);
2197                         s->s_root = NULL;
2198                         goto error_unlocked;
2199                 }
2200                 reiserfs_write_lock(s);
2201         }
2202         /*
2203          * mark hash in super block: it could be unset. overwrite should be ok
2204          */
2205         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2206 
2207         handle_attrs(s);
2208 
2209         reiserfs_proc_info_init(s);
2210 
2211         init_waitqueue_head(&(sbi->s_wait));
2212         spin_lock_init(&sbi->bitmap_lock);
2213 
2214         reiserfs_write_unlock(s);
2215 
2216         return (0);
2217 
2218 error:
2219         reiserfs_write_unlock(s);
2220 
2221 error_unlocked:
2222         /* kill the commit thread, free journal ram */
2223         if (jinit_done) {
2224                 reiserfs_write_lock(s);
2225                 journal_release_error(NULL, s);
2226                 reiserfs_write_unlock(s);
2227         }
2228 
2229         if (sbi->commit_wq)
2230                 destroy_workqueue(sbi->commit_wq);
2231 
2232         reiserfs_cancel_old_flush(s);
2233 
2234         reiserfs_free_bitmap_cache(s);
2235         if (SB_BUFFER_WITH_SB(s))
2236                 brelse(SB_BUFFER_WITH_SB(s));
2237 #ifdef CONFIG_QUOTA
2238         {
2239                 int j;
2240                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2241                         kfree(qf_names[j]);
2242         }
2243 #endif
2244         kfree(sbi->s_jdev);
2245         kfree(sbi);
2246 
2247         s->s_fs_info = NULL;
2248         return errval;
2249 }
2250 
2251 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2252 {
2253         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2254 
2255         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2256         buf->f_bfree = sb_free_blocks(rs);
2257         buf->f_bavail = buf->f_bfree;
2258         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2259         buf->f_bsize = dentry->d_sb->s_blocksize;
2260         /* changed to accommodate gcc folks. */
2261         buf->f_type = REISERFS_SUPER_MAGIC;
2262         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2263         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2264                                 sizeof(rs->s_uuid)/2);
2265 
2266         return 0;
2267 }
2268 
2269 #ifdef CONFIG_QUOTA
2270 static int reiserfs_write_dquot(struct dquot *dquot)
2271 {
2272         struct reiserfs_transaction_handle th;
2273         int ret, err;
2274         int depth;
2275 
2276         reiserfs_write_lock(dquot->dq_sb);
2277         ret =
2278             journal_begin(&th, dquot->dq_sb,
2279                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2280         if (ret)
2281                 goto out;
2282         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2283         ret = dquot_commit(dquot);
2284         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2285         err = journal_end(&th);
2286         if (!ret && err)
2287                 ret = err;
2288 out:
2289         reiserfs_write_unlock(dquot->dq_sb);
2290         return ret;
2291 }
2292 
2293 static int reiserfs_acquire_dquot(struct dquot *dquot)
2294 {
2295         struct reiserfs_transaction_handle th;
2296         int ret, err;
2297         int depth;
2298 
2299         reiserfs_write_lock(dquot->dq_sb);
2300         ret =
2301             journal_begin(&th, dquot->dq_sb,
2302                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2303         if (ret)
2304                 goto out;
2305         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2306         ret = dquot_acquire(dquot);
2307         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2308         err = journal_end(&th);
2309         if (!ret && err)
2310                 ret = err;
2311 out:
2312         reiserfs_write_unlock(dquot->dq_sb);
2313         return ret;
2314 }
2315 
2316 static int reiserfs_release_dquot(struct dquot *dquot)
2317 {
2318         struct reiserfs_transaction_handle th;
2319         int ret, err;
2320 
2321         reiserfs_write_lock(dquot->dq_sb);
2322         ret =
2323             journal_begin(&th, dquot->dq_sb,
2324                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2325         reiserfs_write_unlock(dquot->dq_sb);
2326         if (ret) {
2327                 /* Release dquot anyway to avoid endless cycle in dqput() */
2328                 dquot_release(dquot);
2329                 goto out;
2330         }
2331         ret = dquot_release(dquot);
2332         reiserfs_write_lock(dquot->dq_sb);
2333         err = journal_end(&th);
2334         if (!ret && err)
2335                 ret = err;
2336         reiserfs_write_unlock(dquot->dq_sb);
2337 out:
2338         return ret;
2339 }
2340 
2341 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2342 {
2343         /* Are we journaling quotas? */
2344         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2345             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2346                 dquot_mark_dquot_dirty(dquot);
2347                 return reiserfs_write_dquot(dquot);
2348         } else
2349                 return dquot_mark_dquot_dirty(dquot);
2350 }
2351 
2352 static int reiserfs_write_info(struct super_block *sb, int type)
2353 {
2354         struct reiserfs_transaction_handle th;
2355         int ret, err;
2356         int depth;
2357 
2358         /* Data block + inode block */
2359         reiserfs_write_lock(sb);
2360         ret = journal_begin(&th, sb, 2);
2361         if (ret)
2362                 goto out;
2363         depth = reiserfs_write_unlock_nested(sb);
2364         ret = dquot_commit_info(sb, type);
2365         reiserfs_write_lock_nested(sb, depth);
2366         err = journal_end(&th);
2367         if (!ret && err)
2368                 ret = err;
2369 out:
2370         reiserfs_write_unlock(sb);
2371         return ret;
2372 }
2373 
2374 /*
2375  * Turn on quotas during mount time - we need to find the quota file and such...
2376  */
2377 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2378 {
2379         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2380                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2381 }
2382 
2383 /*
2384  * Standard function to be called on quota_on
2385  */
2386 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2387                              const struct path *path)
2388 {
2389         int err;
2390         struct inode *inode;
2391         struct reiserfs_transaction_handle th;
2392         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2393 
2394         reiserfs_write_lock(sb);
2395         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2396                 err = -EINVAL;
2397                 goto out;
2398         }
2399 
2400         /* Quotafile not on the same filesystem? */
2401         if (path->dentry->d_sb != sb) {
2402                 err = -EXDEV;
2403                 goto out;
2404         }
2405         inode = d_inode(path->dentry);
2406         /*
2407          * We must not pack tails for quota files on reiserfs for quota
2408          * IO to work
2409          */
2410         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2411                 err = reiserfs_unpack(inode, NULL);
2412                 if (err) {
2413                         reiserfs_warning(sb, "super-6520",
2414                                 "Unpacking tail of quota file failed"
2415                                 " (%d). Cannot turn on quotas.", err);
2416                         err = -EINVAL;
2417                         goto out;
2418                 }
2419                 mark_inode_dirty(inode);
2420         }
2421         /* Journaling quota? */
2422         if (REISERFS_SB(sb)->s_qf_names[type]) {
2423                 /* Quotafile not of fs root? */
2424                 if (path->dentry->d_parent != sb->s_root)
2425                         reiserfs_warning(sb, "super-6521",
2426                                  "Quota file not on filesystem root. "
2427                                  "Journalled quota will not work.");
2428         }
2429 
2430         /*
2431          * When we journal data on quota file, we have to flush journal to see
2432          * all updates to the file when we bypass pagecache...
2433          */
2434         if (reiserfs_file_data_log(inode)) {
2435                 /* Just start temporary transaction and finish it */
2436                 err = journal_begin(&th, sb, 1);
2437                 if (err)
2438                         goto out;
2439                 err = journal_end_sync(&th);
2440                 if (err)
2441                         goto out;
2442         }
2443         reiserfs_write_unlock(sb);
2444         err = dquot_quota_on(sb, type, format_id, path);
2445         if (!err) {
2446                 inode_lock(inode);
2447                 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2448                                               REISERFS_NOATIME_FL;
2449                 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2450                                 S_IMMUTABLE | S_NOATIME);
2451                 inode_unlock(inode);
2452                 mark_inode_dirty(inode);
2453         }
2454         return err;
2455 out:
2456         reiserfs_write_unlock(sb);
2457         return err;
2458 }
2459 
2460 static int reiserfs_quota_off(struct super_block *sb, int type)
2461 {
2462         int err;
2463         struct inode *inode = sb_dqopt(sb)->files[type];
2464 
2465         if (!inode || !igrab(inode))
2466                 goto out;
2467 
2468         err = dquot_quota_off(sb, type);
2469         if (err)
2470                 goto out_put;
2471 
2472         inode_lock(inode);
2473         REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2474                                         REISERFS_NOATIME_FL);
2475         inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2476         inode_unlock(inode);
2477         mark_inode_dirty(inode);
2478 out_put:
2479         iput(inode);
2480         return err;
2481 out:
2482         return dquot_quota_off(sb, type);
2483 }
2484 
2485 /*
2486  * Read data from quotafile - avoid pagecache and such because we cannot afford
2487  * acquiring the locks... As quota files are never truncated and quota code
2488  * itself serializes the operations (and no one else should touch the files)
2489  * we don't have to be afraid of races
2490  */
2491 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2492                                    size_t len, loff_t off)
2493 {
2494         struct inode *inode = sb_dqopt(sb)->files[type];
2495         unsigned long blk = off >> sb->s_blocksize_bits;
2496         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2497         size_t toread;
2498         struct buffer_head tmp_bh, *bh;
2499         loff_t i_size = i_size_read(inode);
2500 
2501         if (off > i_size)
2502                 return 0;
2503         if (off + len > i_size)
2504                 len = i_size - off;
2505         toread = len;
2506         while (toread > 0) {
2507                 tocopy =
2508                     sb->s_blocksize - offset <
2509                     toread ? sb->s_blocksize - offset : toread;
2510                 tmp_bh.b_state = 0;
2511                 /*
2512                  * Quota files are without tails so we can safely
2513                  * use this function
2514                  */
2515                 reiserfs_write_lock(sb);
2516                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2517                 reiserfs_write_unlock(sb);
2518                 if (err)
2519                         return err;
2520                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2521                         memset(data, 0, tocopy);
2522                 else {
2523                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2524                         if (!bh)
2525                                 return -EIO;
2526                         memcpy(data, bh->b_data + offset, tocopy);
2527                         brelse(bh);
2528                 }
2529                 offset = 0;
2530                 toread -= tocopy;
2531                 data += tocopy;
2532                 blk++;
2533         }
2534         return len;
2535 }
2536 
2537 /*
2538  * Write to quotafile (we know the transaction is already started and has
2539  * enough credits)
2540  */
2541 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2542                                     const char *data, size_t len, loff_t off)
2543 {
2544         struct inode *inode = sb_dqopt(sb)->files[type];
2545         unsigned long blk = off >> sb->s_blocksize_bits;
2546         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2547         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2548         size_t towrite = len;
2549         struct buffer_head tmp_bh, *bh;
2550 
2551         if (!current->journal_info) {
2552                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2553                         (unsigned long long)off, (unsigned long long)len);
2554                 return -EIO;
2555         }
2556         while (towrite > 0) {
2557                 tocopy = sb->s_blocksize - offset < towrite ?
2558                     sb->s_blocksize - offset : towrite;
2559                 tmp_bh.b_state = 0;
2560                 reiserfs_write_lock(sb);
2561                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2562                 reiserfs_write_unlock(sb);
2563                 if (err)
2564                         goto out;
2565                 if (offset || tocopy != sb->s_blocksize)
2566                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2567                 else
2568                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2569                 if (!bh) {
2570                         err = -EIO;
2571                         goto out;
2572                 }
2573                 lock_buffer(bh);
2574                 memcpy(bh->b_data + offset, data, tocopy);
2575                 flush_dcache_page(bh->b_page);
2576                 set_buffer_uptodate(bh);
2577                 unlock_buffer(bh);
2578                 reiserfs_write_lock(sb);
2579                 reiserfs_prepare_for_journal(sb, bh, 1);
2580                 journal_mark_dirty(current->journal_info, bh);
2581                 if (!journal_quota)
2582                         reiserfs_add_ordered_list(inode, bh);
2583                 reiserfs_write_unlock(sb);
2584                 brelse(bh);
2585                 offset = 0;
2586                 towrite -= tocopy;
2587                 data += tocopy;
2588                 blk++;
2589         }
2590 out:
2591         if (len == towrite)
2592                 return err;
2593         if (inode->i_size < off + len - towrite)
2594                 i_size_write(inode, off + len - towrite);
2595         inode->i_mtime = inode->i_ctime = current_time(inode);
2596         mark_inode_dirty(inode);
2597         return len - towrite;
2598 }
2599 
2600 #endif
2601 
2602 static struct dentry *get_super_block(struct file_system_type *fs_type,
2603                            int flags, const char *dev_name,
2604                            void *data)
2605 {
2606         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2607 }
2608 
2609 static int __init init_reiserfs_fs(void)
2610 {
2611         int ret;
2612 
2613         ret = init_inodecache();
2614         if (ret)
2615                 return ret;
2616 
2617         reiserfs_proc_info_global_init();
2618 
2619         ret = register_filesystem(&reiserfs_fs_type);
2620         if (ret)
2621                 goto out;
2622 
2623         return 0;
2624 out:
2625         reiserfs_proc_info_global_done();
2626         destroy_inodecache();
2627 
2628         return ret;
2629 }
2630 
2631 static void __exit exit_reiserfs_fs(void)
2632 {
2633         reiserfs_proc_info_global_done();
2634         unregister_filesystem(&reiserfs_fs_type);
2635         destroy_inodecache();
2636 }
2637 
2638 struct file_system_type reiserfs_fs_type = {
2639         .owner = THIS_MODULE,
2640         .name = "reiserfs",
2641         .mount = get_super_block,
2642         .kill_sb = reiserfs_kill_sb,
2643         .fs_flags = FS_REQUIRES_DEV,
2644 };
2645 MODULE_ALIAS_FS("reiserfs");
2646 
2647 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2648 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2649 MODULE_LICENSE("GPL");
2650 
2651 module_init(init_reiserfs_fs);
2652 module_exit(exit_reiserfs_fs);
2653 

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