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TOMOYO Linux Cross Reference
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(s->s_fs_info);
633         s->s_fs_info = NULL;
634 }
635 
636 static struct kmem_cache *reiserfs_inode_cachep;
637 
638 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
639 {
640         struct reiserfs_inode_info *ei;
641         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
642         if (!ei)
643                 return NULL;
644         atomic_set(&ei->openers, 0);
645         mutex_init(&ei->tailpack);
646 #ifdef CONFIG_QUOTA
647         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
648 #endif
649 
650         return &ei->vfs_inode;
651 }
652 
653 static void reiserfs_i_callback(struct rcu_head *head)
654 {
655         struct inode *inode = container_of(head, struct inode, i_rcu);
656         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
657 }
658 
659 static void reiserfs_destroy_inode(struct inode *inode)
660 {
661         call_rcu(&inode->i_rcu, reiserfs_i_callback);
662 }
663 
664 static void init_once(void *foo)
665 {
666         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
667 
668         INIT_LIST_HEAD(&ei->i_prealloc_list);
669         inode_init_once(&ei->vfs_inode);
670 }
671 
672 static int __init init_inodecache(void)
673 {
674         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
675                                                   sizeof(struct
676                                                          reiserfs_inode_info),
677                                                   0, (SLAB_RECLAIM_ACCOUNT|
678                                                       SLAB_MEM_SPREAD|
679                                                       SLAB_ACCOUNT),
680                                                   init_once);
681         if (reiserfs_inode_cachep == NULL)
682                 return -ENOMEM;
683         return 0;
684 }
685 
686 static void destroy_inodecache(void)
687 {
688         /*
689          * Make sure all delayed rcu free inodes are flushed before we
690          * destroy cache.
691          */
692         rcu_barrier();
693         kmem_cache_destroy(reiserfs_inode_cachep);
694 }
695 
696 /* we don't mark inodes dirty, we just log them */
697 static void reiserfs_dirty_inode(struct inode *inode, int flags)
698 {
699         struct reiserfs_transaction_handle th;
700 
701         int err = 0;
702 
703         if (sb_rdonly(inode->i_sb)) {
704                 reiserfs_warning(inode->i_sb, "clm-6006",
705                                  "writing inode %lu on readonly FS",
706                                  inode->i_ino);
707                 return;
708         }
709         reiserfs_write_lock(inode->i_sb);
710 
711         /*
712          * this is really only used for atime updates, so they don't have
713          * to be included in O_SYNC or fsync
714          */
715         err = journal_begin(&th, inode->i_sb, 1);
716         if (err)
717                 goto out;
718 
719         reiserfs_update_sd(&th, inode);
720         journal_end(&th);
721 
722 out:
723         reiserfs_write_unlock(inode->i_sb);
724 }
725 
726 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
727 {
728         struct super_block *s = root->d_sb;
729         struct reiserfs_journal *journal = SB_JOURNAL(s);
730         long opts = REISERFS_SB(s)->s_mount_opt;
731 
732         if (opts & (1 << REISERFS_LARGETAIL))
733                 seq_puts(seq, ",tails=on");
734         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
735                 seq_puts(seq, ",notail");
736         /* tails=small is default so we don't show it */
737 
738         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
739                 seq_puts(seq, ",barrier=none");
740         /* barrier=flush is default so we don't show it */
741 
742         if (opts & (1 << REISERFS_ERROR_CONTINUE))
743                 seq_puts(seq, ",errors=continue");
744         else if (opts & (1 << REISERFS_ERROR_PANIC))
745                 seq_puts(seq, ",errors=panic");
746         /* errors=ro is default so we don't show it */
747 
748         if (opts & (1 << REISERFS_DATA_LOG))
749                 seq_puts(seq, ",data=journal");
750         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
751                 seq_puts(seq, ",data=writeback");
752         /* data=ordered is default so we don't show it */
753 
754         if (opts & (1 << REISERFS_ATTRS))
755                 seq_puts(seq, ",attrs");
756 
757         if (opts & (1 << REISERFS_XATTRS_USER))
758                 seq_puts(seq, ",user_xattr");
759 
760         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
761                 seq_puts(seq, ",expose_privroot");
762 
763         if (opts & (1 << REISERFS_POSIXACL))
764                 seq_puts(seq, ",acl");
765 
766         if (REISERFS_SB(s)->s_jdev)
767                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
768 
769         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
770                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
771 
772 #ifdef CONFIG_QUOTA
773         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
774                 seq_show_option(seq, "usrjquota",
775                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
776         else if (opts & (1 << REISERFS_USRQUOTA))
777                 seq_puts(seq, ",usrquota");
778         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
779                 seq_show_option(seq, "grpjquota",
780                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
781         else if (opts & (1 << REISERFS_GRPQUOTA))
782                 seq_puts(seq, ",grpquota");
783         if (REISERFS_SB(s)->s_jquota_fmt) {
784                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
785                         seq_puts(seq, ",jqfmt=vfsold");
786                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
787                         seq_puts(seq, ",jqfmt=vfsv0");
788         }
789 #endif
790 
791         /* Block allocator options */
792         if (opts & (1 << REISERFS_NO_BORDER))
793                 seq_puts(seq, ",block-allocator=noborder");
794         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
795                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
796         if (opts & (1 << REISERFS_HASHED_RELOCATION))
797                 seq_puts(seq, ",block-allocator=hashed_relocation");
798         if (opts & (1 << REISERFS_TEST4))
799                 seq_puts(seq, ",block-allocator=test4");
800         show_alloc_options(seq, s);
801         return 0;
802 }
803 
804 #ifdef CONFIG_QUOTA
805 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
806                                     size_t, loff_t);
807 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
808                                    loff_t);
809 
810 static struct dquot **reiserfs_get_dquots(struct inode *inode)
811 {
812         return REISERFS_I(inode)->i_dquot;
813 }
814 #endif
815 
816 static const struct super_operations reiserfs_sops = {
817         .alloc_inode = reiserfs_alloc_inode,
818         .destroy_inode = reiserfs_destroy_inode,
819         .write_inode = reiserfs_write_inode,
820         .dirty_inode = reiserfs_dirty_inode,
821         .evict_inode = reiserfs_evict_inode,
822         .put_super = reiserfs_put_super,
823         .sync_fs = reiserfs_sync_fs,
824         .freeze_fs = reiserfs_freeze,
825         .unfreeze_fs = reiserfs_unfreeze,
826         .statfs = reiserfs_statfs,
827         .remount_fs = reiserfs_remount,
828         .show_options = reiserfs_show_options,
829 #ifdef CONFIG_QUOTA
830         .quota_read = reiserfs_quota_read,
831         .quota_write = reiserfs_quota_write,
832         .get_dquots = reiserfs_get_dquots,
833 #endif
834 };
835 
836 #ifdef CONFIG_QUOTA
837 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
838 
839 static int reiserfs_write_dquot(struct dquot *);
840 static int reiserfs_acquire_dquot(struct dquot *);
841 static int reiserfs_release_dquot(struct dquot *);
842 static int reiserfs_mark_dquot_dirty(struct dquot *);
843 static int reiserfs_write_info(struct super_block *, int);
844 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
845 
846 static const struct dquot_operations reiserfs_quota_operations = {
847         .write_dquot = reiserfs_write_dquot,
848         .acquire_dquot = reiserfs_acquire_dquot,
849         .release_dquot = reiserfs_release_dquot,
850         .mark_dirty = reiserfs_mark_dquot_dirty,
851         .write_info = reiserfs_write_info,
852         .alloc_dquot    = dquot_alloc,
853         .destroy_dquot  = dquot_destroy,
854         .get_next_id    = dquot_get_next_id,
855 };
856 
857 static const struct quotactl_ops reiserfs_qctl_operations = {
858         .quota_on = reiserfs_quota_on,
859         .quota_off = reiserfs_quota_off,
860         .quota_sync = dquot_quota_sync,
861         .get_state = dquot_get_state,
862         .set_info = dquot_set_dqinfo,
863         .get_dqblk = dquot_get_dqblk,
864         .set_dqblk = dquot_set_dqblk,
865 };
866 #endif
867 
868 static const struct export_operations reiserfs_export_ops = {
869         .encode_fh = reiserfs_encode_fh,
870         .fh_to_dentry = reiserfs_fh_to_dentry,
871         .fh_to_parent = reiserfs_fh_to_parent,
872         .get_parent = reiserfs_get_parent,
873 };
874 
875 /*
876  * this struct is used in reiserfs_getopt () for containing the value for
877  * those mount options that have values rather than being toggles.
878  */
879 typedef struct {
880         char *value;
881         /*
882          * bitmask which is to set on mount_options bitmask
883          * when this value is found, 0 is no bits are to be changed.
884          */
885         int setmask;
886         /*
887          * bitmask which is to clear on mount_options bitmask
888          * when this value is found, 0 is no bits are to be changed.
889          * This is applied BEFORE setmask
890          */
891         int clrmask;
892 } arg_desc_t;
893 
894 /* Set this bit in arg_required to allow empty arguments */
895 #define REISERFS_OPT_ALLOWEMPTY 31
896 
897 /*
898  * this struct is used in reiserfs_getopt() for describing the
899  * set of reiserfs mount options
900  */
901 typedef struct {
902         char *option_name;
903 
904         /* 0 if argument is not required, not 0 otherwise */
905         int arg_required;
906 
907         /* list of values accepted by an option */
908         const arg_desc_t *values;
909 
910         /*
911          * bitmask which is to set on mount_options bitmask
912          * when this value is found, 0 is no bits are to be changed.
913          */
914         int setmask;
915 
916         /*
917          * bitmask which is to clear on mount_options bitmask
918          * when this value is found, 0 is no bits are to be changed.
919          * This is applied BEFORE setmask
920          */
921         int clrmask;
922 } opt_desc_t;
923 
924 /* possible values for -o data= */
925 static const arg_desc_t logging_mode[] = {
926         {"ordered", 1 << REISERFS_DATA_ORDERED,
927          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
928         {"journal", 1 << REISERFS_DATA_LOG,
929          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
930         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
931          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
932         {.value = NULL}
933 };
934 
935 /* possible values for -o barrier= */
936 static const arg_desc_t barrier_mode[] = {
937         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
938         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
939         {.value = NULL}
940 };
941 
942 /*
943  * possible values for "-o block-allocator=" and bits which are to be set in
944  * s_mount_opt of reiserfs specific part of in-core super block
945  */
946 static const arg_desc_t balloc[] = {
947         {"noborder", 1 << REISERFS_NO_BORDER, 0},
948         {"border", 0, 1 << REISERFS_NO_BORDER},
949         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
950         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
951         {"test4", 1 << REISERFS_TEST4, 0},
952         {"notest4", 0, 1 << REISERFS_TEST4},
953         {NULL, 0, 0}
954 };
955 
956 static const arg_desc_t tails[] = {
957         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
958         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
959         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
960         {NULL, 0, 0}
961 };
962 
963 static const arg_desc_t error_actions[] = {
964         {"panic", 1 << REISERFS_ERROR_PANIC,
965          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
966         {"ro-remount", 1 << REISERFS_ERROR_RO,
967          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
968 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
969         {"continue", 1 << REISERFS_ERROR_CONTINUE,
970          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
971 #endif
972         {NULL, 0, 0},
973 };
974 
975 /*
976  * proceed only one option from a list *cur - string containing of mount
977  * options
978  * opts - array of options which are accepted
979  * opt_arg - if option is found and requires an argument and if it is specifed
980  * in the input - pointer to the argument is stored here
981  * bit_flags - if option requires to set a certain bit - it is set here
982  * return -1 if unknown option is found, opt->arg_required otherwise
983  */
984 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
985                            char **opt_arg, unsigned long *bit_flags)
986 {
987         char *p;
988         /*
989          * foo=bar,
990          * ^   ^  ^
991          * |   |  +-- option_end
992          * |   +-- arg_start
993          * +-- option_start
994          */
995         const opt_desc_t *opt;
996         const arg_desc_t *arg;
997 
998         p = *cur;
999 
1000         /* assume argument cannot contain commas */
1001         *cur = strchr(p, ',');
1002         if (*cur) {
1003                 *(*cur) = '\0';
1004                 (*cur)++;
1005         }
1006 
1007         if (!strncmp(p, "alloc=", 6)) {
1008                 /*
1009                  * Ugly special case, probably we should redo options
1010                  * parser so that it can understand several arguments for
1011                  * some options, also so that it can fill several bitfields
1012                  * with option values.
1013                  */
1014                 if (reiserfs_parse_alloc_options(s, p + 6)) {
1015                         return -1;
1016                 } else {
1017                         return 0;
1018                 }
1019         }
1020 
1021         /* for every option in the list */
1022         for (opt = opts; opt->option_name; opt++) {
1023                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1024                         if (bit_flags) {
1025                                 if (opt->clrmask ==
1026                                     (1 << REISERFS_UNSUPPORTED_OPT))
1027                                         reiserfs_warning(s, "super-6500",
1028                                                          "%s not supported.\n",
1029                                                          p);
1030                                 else
1031                                         *bit_flags &= ~opt->clrmask;
1032                                 if (opt->setmask ==
1033                                     (1 << REISERFS_UNSUPPORTED_OPT))
1034                                         reiserfs_warning(s, "super-6501",
1035                                                          "%s not supported.\n",
1036                                                          p);
1037                                 else
1038                                         *bit_flags |= opt->setmask;
1039                         }
1040                         break;
1041                 }
1042         }
1043         if (!opt->option_name) {
1044                 reiserfs_warning(s, "super-6502",
1045                                  "unknown mount option \"%s\"", p);
1046                 return -1;
1047         }
1048 
1049         p += strlen(opt->option_name);
1050         switch (*p) {
1051         case '=':
1052                 if (!opt->arg_required) {
1053                         reiserfs_warning(s, "super-6503",
1054                                          "the option \"%s\" does not "
1055                                          "require an argument\n",
1056                                          opt->option_name);
1057                         return -1;
1058                 }
1059                 break;
1060 
1061         case 0:
1062                 if (opt->arg_required) {
1063                         reiserfs_warning(s, "super-6504",
1064                                          "the option \"%s\" requires an "
1065                                          "argument\n", opt->option_name);
1066                         return -1;
1067                 }
1068                 break;
1069         default:
1070                 reiserfs_warning(s, "super-6505",
1071                                  "head of option \"%s\" is only correct\n",
1072                                  opt->option_name);
1073                 return -1;
1074         }
1075 
1076         /*
1077          * move to the argument, or to next option if argument is not
1078          * required
1079          */
1080         p++;
1081 
1082         if (opt->arg_required
1083             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1084             && !strlen(p)) {
1085                 /* this catches "option=," if not allowed */
1086                 reiserfs_warning(s, "super-6506",
1087                                  "empty argument for \"%s\"\n",
1088                                  opt->option_name);
1089                 return -1;
1090         }
1091 
1092         if (!opt->values) {
1093                 /* *=NULLopt_arg contains pointer to argument */
1094                 *opt_arg = p;
1095                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1096         }
1097 
1098         /* values possible for this option are listed in opt->values */
1099         for (arg = opt->values; arg->value; arg++) {
1100                 if (!strcmp(p, arg->value)) {
1101                         if (bit_flags) {
1102                                 *bit_flags &= ~arg->clrmask;
1103                                 *bit_flags |= arg->setmask;
1104                         }
1105                         return opt->arg_required;
1106                 }
1107         }
1108 
1109         reiserfs_warning(s, "super-6506",
1110                          "bad value \"%s\" for option \"%s\"\n", p,
1111                          opt->option_name);
1112         return -1;
1113 }
1114 
1115 /* returns 0 if something is wrong in option string, 1 - otherwise */
1116 static int reiserfs_parse_options(struct super_block *s,
1117 
1118                                   /* string given via mount's -o */
1119                                   char *options,
1120 
1121                                   /*
1122                                    * after the parsing phase, contains the
1123                                    * collection of bitflags defining what
1124                                    * mount options were selected.
1125                                    */
1126                                   unsigned long *mount_options,
1127 
1128                                   /* strtol-ed from NNN of resize=NNN */
1129                                   unsigned long *blocks,
1130                                   char **jdev_name,
1131                                   unsigned int *commit_max_age,
1132                                   char **qf_names,
1133                                   unsigned int *qfmt)
1134 {
1135         int c;
1136         char *arg = NULL;
1137         char *pos;
1138         opt_desc_t opts[] = {
1139                 /*
1140                  * Compatibility stuff, so that -o notail for old
1141                  * setups still work
1142                  */
1143                 {"tails",.arg_required = 't',.values = tails},
1144                 {"notail",.clrmask =
1145                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1146                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1147                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1148                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1149                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1150 #ifdef CONFIG_REISERFS_FS_XATTR
1151                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1152                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1153 #else
1154                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1155                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1156 #endif
1157 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1158                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1159                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1160 #else
1161                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1162                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1163 #endif
1164                 {.option_name = "nolog"},
1165                 {"replayonly",.setmask = 1 << REPLAYONLY},
1166                 {"block-allocator",.arg_required = 'a',.values = balloc},
1167                 {"data",.arg_required = 'd',.values = logging_mode},
1168                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1169                 {"resize",.arg_required = 'r',.values = NULL},
1170                 {"jdev",.arg_required = 'j',.values = NULL},
1171                 {"nolargeio",.arg_required = 'w',.values = NULL},
1172                 {"commit",.arg_required = 'c',.values = NULL},
1173                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1174                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1175                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1176                 {"errors",.arg_required = 'e',.values = error_actions},
1177                 {"usrjquota",.arg_required =
1178                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1179                 {"grpjquota",.arg_required =
1180                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1181                 {"jqfmt",.arg_required = 'f',.values = NULL},
1182                 {.option_name = NULL}
1183         };
1184 
1185         *blocks = 0;
1186         if (!options || !*options)
1187                 /*
1188                  * use default configuration: create tails, journaling on, no
1189                  * conversion to newest format
1190                  */
1191                 return 1;
1192 
1193         for (pos = options; pos;) {
1194                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1195                 if (c == -1)
1196                         /* wrong option is given */
1197                         return 0;
1198 
1199                 if (c == 'r') {
1200                         char *p;
1201 
1202                         p = NULL;
1203                         /* "resize=NNN" or "resize=auto" */
1204 
1205                         if (!strcmp(arg, "auto")) {
1206                                 /* From JFS code, to auto-get the size. */
1207                                 *blocks =
1208                                     i_size_read(s->s_bdev->bd_inode) >> s->
1209                                     s_blocksize_bits;
1210                         } else {
1211                                 *blocks = simple_strtoul(arg, &p, 0);
1212                                 if (*p != '\0') {
1213                                         /* NNN does not look like a number */
1214                                         reiserfs_warning(s, "super-6507",
1215                                                          "bad value %s for "
1216                                                          "-oresize\n", arg);
1217                                         return 0;
1218                                 }
1219                         }
1220                 }
1221 
1222                 if (c == 'c') {
1223                         char *p = NULL;
1224                         unsigned long val = simple_strtoul(arg, &p, 0);
1225                         /* commit=NNN (time in seconds) */
1226                         if (*p != '\0' || val >= (unsigned int)-1) {
1227                                 reiserfs_warning(s, "super-6508",
1228                                                  "bad value %s for -ocommit\n",
1229                                                  arg);
1230                                 return 0;
1231                         }
1232                         *commit_max_age = (unsigned int)val;
1233                 }
1234 
1235                 if (c == 'w') {
1236                         reiserfs_warning(s, "super-6509", "nolargeio option "
1237                                          "is no longer supported");
1238                         return 0;
1239                 }
1240 
1241                 if (c == 'j') {
1242                         if (arg && *arg && jdev_name) {
1243                                 /* Hm, already assigned? */
1244                                 if (*jdev_name) {
1245                                         reiserfs_warning(s, "super-6510",
1246                                                          "journal device was "
1247                                                          "already specified to "
1248                                                          "be %s", *jdev_name);
1249                                         return 0;
1250                                 }
1251                                 *jdev_name = arg;
1252                         }
1253                 }
1254 #ifdef CONFIG_QUOTA
1255                 if (c == 'u' || c == 'g') {
1256                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1257 
1258                         if (sb_any_quota_loaded(s) &&
1259                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1260                                 reiserfs_warning(s, "super-6511",
1261                                                  "cannot change journaled "
1262                                                  "quota options when quota "
1263                                                  "turned on.");
1264                                 return 0;
1265                         }
1266                         if (*arg) {     /* Some filename specified? */
1267                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1268                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1269                                               arg)) {
1270                                         reiserfs_warning(s, "super-6512",
1271                                                          "%s quota file "
1272                                                          "already specified.",
1273                                                          QTYPE2NAME(qtype));
1274                                         return 0;
1275                                 }
1276                                 if (strchr(arg, '/')) {
1277                                         reiserfs_warning(s, "super-6513",
1278                                                          "quotafile must be "
1279                                                          "on filesystem root.");
1280                                         return 0;
1281                                 }
1282                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1283                                 if (!qf_names[qtype]) {
1284                                         reiserfs_warning(s, "reiserfs-2502",
1285                                                          "not enough memory "
1286                                                          "for storing "
1287                                                          "quotafile name.");
1288                                         return 0;
1289                                 }
1290                                 if (qtype == USRQUOTA)
1291                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1292                                 else
1293                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1294                         } else {
1295                                 if (qf_names[qtype] !=
1296                                     REISERFS_SB(s)->s_qf_names[qtype])
1297                                         kfree(qf_names[qtype]);
1298                                 qf_names[qtype] = NULL;
1299                                 if (qtype == USRQUOTA)
1300                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1301                                 else
1302                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1303                         }
1304                 }
1305                 if (c == 'f') {
1306                         if (!strcmp(arg, "vfsold"))
1307                                 *qfmt = QFMT_VFS_OLD;
1308                         else if (!strcmp(arg, "vfsv0"))
1309                                 *qfmt = QFMT_VFS_V0;
1310                         else {
1311                                 reiserfs_warning(s, "super-6514",
1312                                                  "unknown quota format "
1313                                                  "specified.");
1314                                 return 0;
1315                         }
1316                         if (sb_any_quota_loaded(s) &&
1317                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1318                                 reiserfs_warning(s, "super-6515",
1319                                                  "cannot change journaled "
1320                                                  "quota options when quota "
1321                                                  "turned on.");
1322                                 return 0;
1323                         }
1324                 }
1325 #else
1326                 if (c == 'u' || c == 'g' || c == 'f') {
1327                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1328                                          "quota options not supported.");
1329                         return 0;
1330                 }
1331 #endif
1332         }
1333 
1334 #ifdef CONFIG_QUOTA
1335         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1336             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1337                 reiserfs_warning(s, "super-6515",
1338                                  "journaled quota format not specified.");
1339                 return 0;
1340         }
1341         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1342                sb_has_quota_loaded(s, USRQUOTA)) ||
1343             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1344                sb_has_quota_loaded(s, GRPQUOTA))) {
1345                 reiserfs_warning(s, "super-6516", "quota options must "
1346                                  "be present when quota is turned on.");
1347                 return 0;
1348         }
1349 #endif
1350 
1351         return 1;
1352 }
1353 
1354 static void switch_data_mode(struct super_block *s, unsigned long mode)
1355 {
1356         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1357                                          (1 << REISERFS_DATA_ORDERED) |
1358                                          (1 << REISERFS_DATA_WRITEBACK));
1359         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1360 }
1361 
1362 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1363 {
1364         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1365                 if (!reiserfs_data_log(s)) {
1366                         switch_data_mode(s, REISERFS_DATA_LOG);
1367                         reiserfs_info(s, "switching to journaled data mode\n");
1368                 }
1369         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1370                 if (!reiserfs_data_ordered(s)) {
1371                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1372                         reiserfs_info(s, "switching to ordered data mode\n");
1373                 }
1374         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1375                 if (!reiserfs_data_writeback(s)) {
1376                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1377                         reiserfs_info(s, "switching to writeback data mode\n");
1378                 }
1379         }
1380 }
1381 
1382 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1383 {
1384         int flush = (1 << REISERFS_BARRIER_FLUSH);
1385         int none = (1 << REISERFS_BARRIER_NONE);
1386         int all_barrier = flush | none;
1387 
1388         if (bits & all_barrier) {
1389                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1390                 if (bits & flush) {
1391                         REISERFS_SB(s)->s_mount_opt |= flush;
1392                         printk("reiserfs: enabling write barrier flush mode\n");
1393                 } else if (bits & none) {
1394                         REISERFS_SB(s)->s_mount_opt |= none;
1395                         printk("reiserfs: write barriers turned off\n");
1396                 }
1397         }
1398 }
1399 
1400 static void handle_attrs(struct super_block *s)
1401 {
1402         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1403 
1404         if (reiserfs_attrs(s)) {
1405                 if (old_format_only(s)) {
1406                         reiserfs_warning(s, "super-6517", "cannot support "
1407                                          "attributes on 3.5.x disk format");
1408                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1409                         return;
1410                 }
1411                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1412                         reiserfs_warning(s, "super-6518", "cannot support "
1413                                          "attributes until flag is set in "
1414                                          "super-block");
1415                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1416                 }
1417         }
1418 }
1419 
1420 #ifdef CONFIG_QUOTA
1421 static void handle_quota_files(struct super_block *s, char **qf_names,
1422                                unsigned int *qfmt)
1423 {
1424         int i;
1425 
1426         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1427                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1428                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1429                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1430         }
1431         if (*qfmt)
1432                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1433 }
1434 #endif
1435 
1436 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1437 {
1438         struct reiserfs_super_block *rs;
1439         struct reiserfs_transaction_handle th;
1440         unsigned long blocks;
1441         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1442         unsigned long safe_mask = 0;
1443         unsigned int commit_max_age = (unsigned int)-1;
1444         struct reiserfs_journal *journal = SB_JOURNAL(s);
1445         char *new_opts;
1446         int err;
1447         char *qf_names[REISERFS_MAXQUOTAS];
1448         unsigned int qfmt = 0;
1449 #ifdef CONFIG_QUOTA
1450         int i;
1451 #endif
1452 
1453         new_opts = kstrdup(arg, GFP_KERNEL);
1454         if (arg && !new_opts)
1455                 return -ENOMEM;
1456 
1457         sync_filesystem(s);
1458         reiserfs_write_lock(s);
1459 
1460 #ifdef CONFIG_QUOTA
1461         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1462 #endif
1463 
1464         rs = SB_DISK_SUPER_BLOCK(s);
1465 
1466         if (!reiserfs_parse_options
1467             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1468             qf_names, &qfmt)) {
1469 #ifdef CONFIG_QUOTA
1470                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1471                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1472                                 kfree(qf_names[i]);
1473 #endif
1474                 err = -EINVAL;
1475                 goto out_err_unlock;
1476         }
1477 #ifdef CONFIG_QUOTA
1478         handle_quota_files(s, qf_names, &qfmt);
1479 #endif
1480 
1481         handle_attrs(s);
1482 
1483         /* Add options that are safe here */
1484         safe_mask |= 1 << REISERFS_SMALLTAIL;
1485         safe_mask |= 1 << REISERFS_LARGETAIL;
1486         safe_mask |= 1 << REISERFS_NO_BORDER;
1487         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1488         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1489         safe_mask |= 1 << REISERFS_TEST4;
1490         safe_mask |= 1 << REISERFS_ATTRS;
1491         safe_mask |= 1 << REISERFS_XATTRS_USER;
1492         safe_mask |= 1 << REISERFS_POSIXACL;
1493         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1494         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1495         safe_mask |= 1 << REISERFS_ERROR_RO;
1496         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1497         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1498         safe_mask |= 1 << REISERFS_USRQUOTA;
1499         safe_mask |= 1 << REISERFS_GRPQUOTA;
1500 
1501         /*
1502          * Update the bitmask, taking care to keep
1503          * the bits we're not allowed to change here
1504          */
1505         REISERFS_SB(s)->s_mount_opt =
1506             (REISERFS_SB(s)->
1507              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1508 
1509         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1510                 journal->j_max_commit_age = commit_max_age;
1511                 journal->j_max_trans_age = commit_max_age;
1512         } else if (commit_max_age == 0) {
1513                 /* 0 means restore defaults. */
1514                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1515                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1516         }
1517 
1518         if (blocks) {
1519                 err = reiserfs_resize(s, blocks);
1520                 if (err != 0)
1521                         goto out_err_unlock;
1522         }
1523 
1524         if (*mount_flags & SB_RDONLY) {
1525                 reiserfs_write_unlock(s);
1526                 reiserfs_xattr_init(s, *mount_flags);
1527                 /* remount read-only */
1528                 if (sb_rdonly(s))
1529                         /* it is read-only already */
1530                         goto out_ok_unlocked;
1531 
1532                 err = dquot_suspend(s, -1);
1533                 if (err < 0)
1534                         goto out_err;
1535 
1536                 /* try to remount file system with read-only permissions */
1537                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1538                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1539                         goto out_ok_unlocked;
1540                 }
1541 
1542                 reiserfs_write_lock(s);
1543 
1544                 err = journal_begin(&th, s, 10);
1545                 if (err)
1546                         goto out_err_unlock;
1547 
1548                 /* Mounting a rw partition read-only. */
1549                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1550                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1551                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1552         } else {
1553                 /* remount read-write */
1554                 if (!sb_rdonly(s)) {
1555                         reiserfs_write_unlock(s);
1556                         reiserfs_xattr_init(s, *mount_flags);
1557                         goto out_ok_unlocked;   /* We are read-write already */
1558                 }
1559 
1560                 if (reiserfs_is_journal_aborted(journal)) {
1561                         err = journal->j_errno;
1562                         goto out_err_unlock;
1563                 }
1564 
1565                 handle_data_mode(s, mount_options);
1566                 handle_barrier_mode(s, mount_options);
1567                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1568 
1569                 /* now it is safe to call journal_begin */
1570                 s->s_flags &= ~SB_RDONLY;
1571                 err = journal_begin(&th, s, 10);
1572                 if (err)
1573                         goto out_err_unlock;
1574 
1575                 /* Mount a partition which is read-only, read-write */
1576                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1577                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1578                 s->s_flags &= ~SB_RDONLY;
1579                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1580                 if (!old_format_only(s))
1581                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1582                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1583                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1584                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1585         }
1586         /* this will force a full flush of all journal lists */
1587         SB_JOURNAL(s)->j_must_wait = 1;
1588         err = journal_end(&th);
1589         if (err)
1590                 goto out_err_unlock;
1591 
1592         reiserfs_write_unlock(s);
1593         if (!(*mount_flags & SB_RDONLY)) {
1594                 dquot_resume(s, -1);
1595                 reiserfs_write_lock(s);
1596                 finish_unfinished(s);
1597                 reiserfs_write_unlock(s);
1598                 reiserfs_xattr_init(s, *mount_flags);
1599         }
1600 
1601 out_ok_unlocked:
1602         return 0;
1603 
1604 out_err_unlock:
1605         reiserfs_write_unlock(s);
1606 out_err:
1607         kfree(new_opts);
1608         return err;
1609 }
1610 
1611 static int read_super_block(struct super_block *s, int offset)
1612 {
1613         struct buffer_head *bh;
1614         struct reiserfs_super_block *rs;
1615         int fs_blocksize;
1616 
1617         bh = sb_bread(s, offset / s->s_blocksize);
1618         if (!bh) {
1619                 reiserfs_warning(s, "sh-2006",
1620                                  "bread failed (dev %s, block %lu, size %lu)",
1621                                  s->s_id, offset / s->s_blocksize,
1622                                  s->s_blocksize);
1623                 return 1;
1624         }
1625 
1626         rs = (struct reiserfs_super_block *)bh->b_data;
1627         if (!is_any_reiserfs_magic_string(rs)) {
1628                 brelse(bh);
1629                 return 1;
1630         }
1631         /*
1632          * ok, reiserfs signature (old or new) found in at the given offset
1633          */
1634         fs_blocksize = sb_blocksize(rs);
1635         brelse(bh);
1636         sb_set_blocksize(s, fs_blocksize);
1637 
1638         bh = sb_bread(s, offset / s->s_blocksize);
1639         if (!bh) {
1640                 reiserfs_warning(s, "sh-2007",
1641                                  "bread failed (dev %s, block %lu, size %lu)",
1642                                  s->s_id, offset / s->s_blocksize,
1643                                  s->s_blocksize);
1644                 return 1;
1645         }
1646 
1647         rs = (struct reiserfs_super_block *)bh->b_data;
1648         if (sb_blocksize(rs) != s->s_blocksize) {
1649                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1650                                  "filesystem on (dev %s, block %llu, size %lu)",
1651                                  s->s_id,
1652                                  (unsigned long long)bh->b_blocknr,
1653                                  s->s_blocksize);
1654                 brelse(bh);
1655                 return 1;
1656         }
1657 
1658         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1659                 brelse(bh);
1660                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1661                                  "--rebuild-tree run detected. Please run\n"
1662                                  "reiserfsck --rebuild-tree and wait for a "
1663                                  "completion. If that fails\n"
1664                                  "get newer reiserfsprogs package");
1665                 return 1;
1666         }
1667 
1668         SB_BUFFER_WITH_SB(s) = bh;
1669         SB_DISK_SUPER_BLOCK(s) = rs;
1670 
1671         /*
1672          * magic is of non-standard journal filesystem, look at s_version to
1673          * find which format is in use
1674          */
1675         if (is_reiserfs_jr(rs)) {
1676                 if (sb_version(rs) == REISERFS_VERSION_2)
1677                         reiserfs_info(s, "found reiserfs format \"3.6\""
1678                                       " with non-standard journal\n");
1679                 else if (sb_version(rs) == REISERFS_VERSION_1)
1680                         reiserfs_info(s, "found reiserfs format \"3.5\""
1681                                       " with non-standard journal\n");
1682                 else {
1683                         reiserfs_warning(s, "sh-2012", "found unknown "
1684                                          "format \"%u\" of reiserfs with "
1685                                          "non-standard magic", sb_version(rs));
1686                         return 1;
1687                 }
1688         } else
1689                 /*
1690                  * s_version of standard format may contain incorrect
1691                  * information, so we just look at the magic string
1692                  */
1693                 reiserfs_info(s,
1694                               "found reiserfs format \"%s\" with standard journal\n",
1695                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1696 
1697         s->s_op = &reiserfs_sops;
1698         s->s_export_op = &reiserfs_export_ops;
1699 #ifdef CONFIG_QUOTA
1700         s->s_qcop = &reiserfs_qctl_operations;
1701         s->dq_op = &reiserfs_quota_operations;
1702         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1703 #endif
1704 
1705         /*
1706          * new format is limited by the 32 bit wide i_blocks field, want to
1707          * be one full block below that.
1708          */
1709         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1710         return 0;
1711 }
1712 
1713 /* after journal replay, reread all bitmap and super blocks */
1714 static int reread_meta_blocks(struct super_block *s)
1715 {
1716         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1717         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1718         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1719                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1720                 return 1;
1721         }
1722 
1723         return 0;
1724 }
1725 
1726 /* hash detection stuff */
1727 
1728 /*
1729  * if root directory is empty - we set default - Yura's - hash and
1730  * warn about it
1731  * FIXME: we look for only one name in a directory. If tea and yura
1732  * both have the same value - we ask user to send report to the
1733  * mailing list
1734  */
1735 static __u32 find_hash_out(struct super_block *s)
1736 {
1737         int retval;
1738         struct inode *inode;
1739         struct cpu_key key;
1740         INITIALIZE_PATH(path);
1741         struct reiserfs_dir_entry de;
1742         struct reiserfs_de_head *deh;
1743         __u32 hash = DEFAULT_HASH;
1744         __u32 deh_hashval, teahash, r5hash, yurahash;
1745 
1746         inode = d_inode(s->s_root);
1747 
1748         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1749         retval = search_by_entry_key(s, &key, &path, &de);
1750         if (retval == IO_ERROR) {
1751                 pathrelse(&path);
1752                 return UNSET_HASH;
1753         }
1754         if (retval == NAME_NOT_FOUND)
1755                 de.de_entry_num--;
1756 
1757         set_de_name_and_namelen(&de);
1758         deh = de.de_deh + de.de_entry_num;
1759 
1760         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1761                 /* allow override in this case */
1762                 if (reiserfs_rupasov_hash(s))
1763                         hash = YURA_HASH;
1764                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1765                 goto out;
1766         }
1767 
1768         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1769         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1770         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1771         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1772 
1773         if ((teahash == r5hash && deh_hashval == r5hash) ||
1774             (teahash == yurahash && deh_hashval == yurahash) ||
1775             (r5hash == yurahash && deh_hashval == yurahash)) {
1776                 reiserfs_warning(s, "reiserfs-2506",
1777                                  "Unable to automatically detect hash "
1778                                  "function. Please mount with -o "
1779                                  "hash={tea,rupasov,r5}");
1780                 hash = UNSET_HASH;
1781                 goto out;
1782         }
1783 
1784         if (deh_hashval == yurahash)
1785                 hash = YURA_HASH;
1786         else if (deh_hashval == teahash)
1787                 hash = TEA_HASH;
1788         else if (deh_hashval == r5hash)
1789                 hash = R5_HASH;
1790         else {
1791                 reiserfs_warning(s, "reiserfs-2506",
1792                                  "Unrecognised hash function");
1793                 hash = UNSET_HASH;
1794         }
1795 out:
1796         pathrelse(&path);
1797         return hash;
1798 }
1799 
1800 /* finds out which hash names are sorted with */
1801 static int what_hash(struct super_block *s)
1802 {
1803         __u32 code;
1804 
1805         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1806 
1807         /*
1808          * reiserfs_hash_detect() == true if any of the hash mount options
1809          * were used.  We must check them to make sure the user isn't
1810          * using a bad hash value
1811          */
1812         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1813                 code = find_hash_out(s);
1814 
1815         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1816                 /*
1817                  * detection has found the hash, and we must check against the
1818                  * mount options
1819                  */
1820                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1821                         reiserfs_warning(s, "reiserfs-2507",
1822                                          "Error, %s hash detected, "
1823                                          "unable to force rupasov hash",
1824                                          reiserfs_hashname(code));
1825                         code = UNSET_HASH;
1826                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1827                         reiserfs_warning(s, "reiserfs-2508",
1828                                          "Error, %s hash detected, "
1829                                          "unable to force tea hash",
1830                                          reiserfs_hashname(code));
1831                         code = UNSET_HASH;
1832                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1833                         reiserfs_warning(s, "reiserfs-2509",
1834                                          "Error, %s hash detected, "
1835                                          "unable to force r5 hash",
1836                                          reiserfs_hashname(code));
1837                         code = UNSET_HASH;
1838                 }
1839         } else {
1840                 /*
1841                  * find_hash_out was not called or
1842                  * could not determine the hash
1843                  */
1844                 if (reiserfs_rupasov_hash(s)) {
1845                         code = YURA_HASH;
1846                 } else if (reiserfs_tea_hash(s)) {
1847                         code = TEA_HASH;
1848                 } else if (reiserfs_r5_hash(s)) {
1849                         code = R5_HASH;
1850                 }
1851         }
1852 
1853         /*
1854          * if we are mounted RW, and we have a new valid hash code, update
1855          * the super
1856          */
1857         if (code != UNSET_HASH &&
1858             !sb_rdonly(s) &&
1859             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1860                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1861         }
1862         return code;
1863 }
1864 
1865 /* return pointer to appropriate function */
1866 static hashf_t hash_function(struct super_block *s)
1867 {
1868         switch (what_hash(s)) {
1869         case TEA_HASH:
1870                 reiserfs_info(s, "Using tea hash to sort names\n");
1871                 return keyed_hash;
1872         case YURA_HASH:
1873                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1874                 return yura_hash;
1875         case R5_HASH:
1876                 reiserfs_info(s, "Using r5 hash to sort names\n");
1877                 return r5_hash;
1878         }
1879         return NULL;
1880 }
1881 
1882 /* this is used to set up correct value for old partitions */
1883 static int function2code(hashf_t func)
1884 {
1885         if (func == keyed_hash)
1886                 return TEA_HASH;
1887         if (func == yura_hash)
1888                 return YURA_HASH;
1889         if (func == r5_hash)
1890                 return R5_HASH;
1891 
1892         BUG();                  /* should never happen */
1893 
1894         return 0;
1895 }
1896 
1897 #define SWARN(silent, s, id, ...)                       \
1898         if (!(silent))                          \
1899                 reiserfs_warning(s, id, __VA_ARGS__)
1900 
1901 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1902 {
1903         struct inode *root_inode;
1904         struct reiserfs_transaction_handle th;
1905         int old_format = 0;
1906         unsigned long blocks;
1907         unsigned int commit_max_age = 0;
1908         int jinit_done = 0;
1909         struct reiserfs_iget_args args;
1910         struct reiserfs_super_block *rs;
1911         char *jdev_name;
1912         struct reiserfs_sb_info *sbi;
1913         int errval = -EINVAL;
1914         char *qf_names[REISERFS_MAXQUOTAS] = {};
1915         unsigned int qfmt = 0;
1916 
1917         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1918         if (!sbi)
1919                 return -ENOMEM;
1920         s->s_fs_info = sbi;
1921         /* Set default values for options: non-aggressive tails, RO on errors */
1922         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1923         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1924         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1925         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1926         sbi->s_alloc_options.preallocmin = 0;
1927         /* Preallocate by 16 blocks (17-1) at once */
1928         sbi->s_alloc_options.preallocsize = 17;
1929         /* setup default block allocator options */
1930         reiserfs_init_alloc_options(s);
1931 
1932         spin_lock_init(&sbi->old_work_lock);
1933         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1934         mutex_init(&sbi->lock);
1935         sbi->lock_depth = -1;
1936 
1937         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1938                                          s->s_id);
1939         if (!sbi->commit_wq) {
1940                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1941                 errval = -ENOMEM;
1942                 goto error_unlocked;
1943         }
1944 
1945         jdev_name = NULL;
1946         if (reiserfs_parse_options
1947             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1948              &commit_max_age, qf_names, &qfmt) == 0) {
1949                 goto error_unlocked;
1950         }
1951         if (jdev_name && jdev_name[0]) {
1952                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1953                 if (!sbi->s_jdev) {
1954                         SWARN(silent, s, "", "Cannot allocate memory for "
1955                                 "journal device name");
1956                         goto error;
1957                 }
1958         }
1959 #ifdef CONFIG_QUOTA
1960         handle_quota_files(s, qf_names, &qfmt);
1961 #endif
1962 
1963         if (blocks) {
1964                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1965                 goto error_unlocked;
1966         }
1967 
1968         /*
1969          * try old format (undistributed bitmap, super block in 8-th 1k
1970          * block of a device)
1971          */
1972         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1973                 old_format = 1;
1974 
1975         /*
1976          * try new format (64-th 1k block), which can contain reiserfs
1977          * super block
1978          */
1979         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1980                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1981                       s->s_id);
1982                 goto error_unlocked;
1983         }
1984 
1985         rs = SB_DISK_SUPER_BLOCK(s);
1986         /*
1987          * Let's do basic sanity check to verify that underlying device is not
1988          * smaller than the filesystem. If the check fails then abort and
1989          * scream, because bad stuff will happen otherwise.
1990          */
1991         if (s->s_bdev && s->s_bdev->bd_inode
1992             && i_size_read(s->s_bdev->bd_inode) <
1993             sb_block_count(rs) * sb_blocksize(rs)) {
1994                 SWARN(silent, s, "", "Filesystem cannot be "
1995                       "mounted because it is bigger than the device");
1996                 SWARN(silent, s, "", "You may need to run fsck "
1997                       "or increase size of your LVM partition");
1998                 SWARN(silent, s, "", "Or may be you forgot to "
1999                       "reboot after fdisk when it told you to");
2000                 goto error_unlocked;
2001         }
2002 
2003         sbi->s_mount_state = SB_REISERFS_STATE(s);
2004         sbi->s_mount_state = REISERFS_VALID_FS;
2005 
2006         if ((errval = reiserfs_init_bitmap_cache(s))) {
2007                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2008                 goto error_unlocked;
2009         }
2010 
2011         errval = -EINVAL;
2012 #ifdef CONFIG_REISERFS_CHECK
2013         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2014         SWARN(silent, s, "", "- it is slow mode for debugging.");
2015 #endif
2016 
2017         /* make data=ordered the default */
2018         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2019             !reiserfs_data_writeback(s)) {
2020                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2021         }
2022 
2023         if (reiserfs_data_log(s)) {
2024                 reiserfs_info(s, "using journaled data mode\n");
2025         } else if (reiserfs_data_ordered(s)) {
2026                 reiserfs_info(s, "using ordered data mode\n");
2027         } else {
2028                 reiserfs_info(s, "using writeback data mode\n");
2029         }
2030         if (reiserfs_barrier_flush(s)) {
2031                 printk("reiserfs: using flush barriers\n");
2032         }
2033 
2034         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2035                 SWARN(silent, s, "sh-2022",
2036                       "unable to initialize journal space");
2037                 goto error_unlocked;
2038         } else {
2039                 /*
2040                  * once this is set, journal_release must be called
2041                  * if we error out of the mount
2042                  */
2043                 jinit_done = 1;
2044         }
2045 
2046         if (reread_meta_blocks(s)) {
2047                 SWARN(silent, s, "jmacd-9",
2048                       "unable to reread meta blocks after journal init");
2049                 goto error_unlocked;
2050         }
2051 
2052         if (replay_only(s))
2053                 goto error_unlocked;
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);
2245 
2246         s->s_fs_info = NULL;
2247         return errval;
2248 }
2249 
2250 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2251 {
2252         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2253 
2254         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2255         buf->f_bfree = sb_free_blocks(rs);
2256         buf->f_bavail = buf->f_bfree;
2257         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2258         buf->f_bsize = dentry->d_sb->s_blocksize;
2259         /* changed to accommodate gcc folks. */
2260         buf->f_type = REISERFS_SUPER_MAGIC;
2261         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2262         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2263                                 sizeof(rs->s_uuid)/2);
2264 
2265         return 0;
2266 }
2267 
2268 #ifdef CONFIG_QUOTA
2269 static int reiserfs_write_dquot(struct dquot *dquot)
2270 {
2271         struct reiserfs_transaction_handle th;
2272         int ret, err;
2273         int depth;
2274 
2275         reiserfs_write_lock(dquot->dq_sb);
2276         ret =
2277             journal_begin(&th, dquot->dq_sb,
2278                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2279         if (ret)
2280                 goto out;
2281         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2282         ret = dquot_commit(dquot);
2283         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2284         err = journal_end(&th);
2285         if (!ret && err)
2286                 ret = err;
2287 out:
2288         reiserfs_write_unlock(dquot->dq_sb);
2289         return ret;
2290 }
2291 
2292 static int reiserfs_acquire_dquot(struct dquot *dquot)
2293 {
2294         struct reiserfs_transaction_handle th;
2295         int ret, err;
2296         int depth;
2297 
2298         reiserfs_write_lock(dquot->dq_sb);
2299         ret =
2300             journal_begin(&th, dquot->dq_sb,
2301                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2302         if (ret)
2303                 goto out;
2304         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2305         ret = dquot_acquire(dquot);
2306         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2307         err = journal_end(&th);
2308         if (!ret && err)
2309                 ret = err;
2310 out:
2311         reiserfs_write_unlock(dquot->dq_sb);
2312         return ret;
2313 }
2314 
2315 static int reiserfs_release_dquot(struct dquot *dquot)
2316 {
2317         struct reiserfs_transaction_handle th;
2318         int ret, err;
2319 
2320         reiserfs_write_lock(dquot->dq_sb);
2321         ret =
2322             journal_begin(&th, dquot->dq_sb,
2323                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2324         reiserfs_write_unlock(dquot->dq_sb);
2325         if (ret) {
2326                 /* Release dquot anyway to avoid endless cycle in dqput() */
2327                 dquot_release(dquot);
2328                 goto out;
2329         }
2330         ret = dquot_release(dquot);
2331         reiserfs_write_lock(dquot->dq_sb);
2332         err = journal_end(&th);
2333         if (!ret && err)
2334                 ret = err;
2335         reiserfs_write_unlock(dquot->dq_sb);
2336 out:
2337         return ret;
2338 }
2339 
2340 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2341 {
2342         /* Are we journaling quotas? */
2343         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2344             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2345                 dquot_mark_dquot_dirty(dquot);
2346                 return reiserfs_write_dquot(dquot);
2347         } else
2348                 return dquot_mark_dquot_dirty(dquot);
2349 }
2350 
2351 static int reiserfs_write_info(struct super_block *sb, int type)
2352 {
2353         struct reiserfs_transaction_handle th;
2354         int ret, err;
2355         int depth;
2356 
2357         /* Data block + inode block */
2358         reiserfs_write_lock(sb);
2359         ret = journal_begin(&th, sb, 2);
2360         if (ret)
2361                 goto out;
2362         depth = reiserfs_write_unlock_nested(sb);
2363         ret = dquot_commit_info(sb, type);
2364         reiserfs_write_lock_nested(sb, depth);
2365         err = journal_end(&th);
2366         if (!ret && err)
2367                 ret = err;
2368 out:
2369         reiserfs_write_unlock(sb);
2370         return ret;
2371 }
2372 
2373 /*
2374  * Turn on quotas during mount time - we need to find the quota file and such...
2375  */
2376 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2377 {
2378         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2379                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2380 }
2381 
2382 /*
2383  * Standard function to be called on quota_on
2384  */
2385 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2386                              const struct path *path)
2387 {
2388         int err;
2389         struct inode *inode;
2390         struct reiserfs_transaction_handle th;
2391         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2392 
2393         reiserfs_write_lock(sb);
2394         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2395                 err = -EINVAL;
2396                 goto out;
2397         }
2398 
2399         /* Quotafile not on the same filesystem? */
2400         if (path->dentry->d_sb != sb) {
2401                 err = -EXDEV;
2402                 goto out;
2403         }
2404         inode = d_inode(path->dentry);
2405         /*
2406          * We must not pack tails for quota files on reiserfs for quota
2407          * IO to work
2408          */
2409         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2410                 err = reiserfs_unpack(inode, NULL);
2411                 if (err) {
2412                         reiserfs_warning(sb, "super-6520",
2413                                 "Unpacking tail of quota file failed"
2414                                 " (%d). Cannot turn on quotas.", err);
2415                         err = -EINVAL;
2416                         goto out;
2417                 }
2418                 mark_inode_dirty(inode);
2419         }
2420         /* Journaling quota? */
2421         if (REISERFS_SB(sb)->s_qf_names[type]) {
2422                 /* Quotafile not of fs root? */
2423                 if (path->dentry->d_parent != sb->s_root)
2424                         reiserfs_warning(sb, "super-6521",
2425                                  "Quota file not on filesystem root. "
2426                                  "Journalled quota will not work.");
2427         }
2428 
2429         /*
2430          * When we journal data on quota file, we have to flush journal to see
2431          * all updates to the file when we bypass pagecache...
2432          */
2433         if (reiserfs_file_data_log(inode)) {
2434                 /* Just start temporary transaction and finish it */
2435                 err = journal_begin(&th, sb, 1);
2436                 if (err)
2437                         goto out;
2438                 err = journal_end_sync(&th);
2439                 if (err)
2440                         goto out;
2441         }
2442         reiserfs_write_unlock(sb);
2443         err = dquot_quota_on(sb, type, format_id, path);
2444         if (!err) {
2445                 inode_lock(inode);
2446                 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2447                                               REISERFS_NOATIME_FL;
2448                 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2449                                 S_IMMUTABLE | S_NOATIME);
2450                 inode_unlock(inode);
2451                 mark_inode_dirty(inode);
2452         }
2453         return err;
2454 out:
2455         reiserfs_write_unlock(sb);
2456         return err;
2457 }
2458 
2459 static int reiserfs_quota_off(struct super_block *sb, int type)
2460 {
2461         int err;
2462         struct inode *inode = sb_dqopt(sb)->files[type];
2463 
2464         if (!inode || !igrab(inode))
2465                 goto out;
2466 
2467         err = dquot_quota_off(sb, type);
2468         if (err)
2469                 goto out_put;
2470 
2471         inode_lock(inode);
2472         REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2473                                         REISERFS_NOATIME_FL);
2474         inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2475         inode_unlock(inode);
2476         mark_inode_dirty(inode);
2477 out_put:
2478         iput(inode);
2479         return err;
2480 out:
2481         return dquot_quota_off(sb, type);
2482 }
2483 
2484 /*
2485  * Read data from quotafile - avoid pagecache and such because we cannot afford
2486  * acquiring the locks... As quota files are never truncated and quota code
2487  * itself serializes the operations (and no one else should touch the files)
2488  * we don't have to be afraid of races
2489  */
2490 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2491                                    size_t len, loff_t off)
2492 {
2493         struct inode *inode = sb_dqopt(sb)->files[type];
2494         unsigned long blk = off >> sb->s_blocksize_bits;
2495         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2496         size_t toread;
2497         struct buffer_head tmp_bh, *bh;
2498         loff_t i_size = i_size_read(inode);
2499 
2500         if (off > i_size)
2501                 return 0;
2502         if (off + len > i_size)
2503                 len = i_size - off;
2504         toread = len;
2505         while (toread > 0) {
2506                 tocopy =
2507                     sb->s_blocksize - offset <
2508                     toread ? sb->s_blocksize - offset : toread;
2509                 tmp_bh.b_state = 0;
2510                 /*
2511                  * Quota files are without tails so we can safely
2512                  * use this function
2513                  */
2514                 reiserfs_write_lock(sb);
2515                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2516                 reiserfs_write_unlock(sb);
2517                 if (err)
2518                         return err;
2519                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2520                         memset(data, 0, tocopy);
2521                 else {
2522                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2523                         if (!bh)
2524                                 return -EIO;
2525                         memcpy(data, bh->b_data + offset, tocopy);
2526                         brelse(bh);
2527                 }
2528                 offset = 0;
2529                 toread -= tocopy;
2530                 data += tocopy;
2531                 blk++;
2532         }
2533         return len;
2534 }
2535 
2536 /*
2537  * Write to quotafile (we know the transaction is already started and has
2538  * enough credits)
2539  */
2540 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2541                                     const char *data, size_t len, loff_t off)
2542 {
2543         struct inode *inode = sb_dqopt(sb)->files[type];
2544         unsigned long blk = off >> sb->s_blocksize_bits;
2545         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2546         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2547         size_t towrite = len;
2548         struct buffer_head tmp_bh, *bh;
2549 
2550         if (!current->journal_info) {
2551                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2552                         (unsigned long long)off, (unsigned long long)len);
2553                 return -EIO;
2554         }
2555         while (towrite > 0) {
2556                 tocopy = sb->s_blocksize - offset < towrite ?
2557                     sb->s_blocksize - offset : towrite;
2558                 tmp_bh.b_state = 0;
2559                 reiserfs_write_lock(sb);
2560                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2561                 reiserfs_write_unlock(sb);
2562                 if (err)
2563                         goto out;
2564                 if (offset || tocopy != sb->s_blocksize)
2565                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2566                 else
2567                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2568                 if (!bh) {
2569                         err = -EIO;
2570                         goto out;
2571                 }
2572                 lock_buffer(bh);
2573                 memcpy(bh->b_data + offset, data, tocopy);
2574                 flush_dcache_page(bh->b_page);
2575                 set_buffer_uptodate(bh);
2576                 unlock_buffer(bh);
2577                 reiserfs_write_lock(sb);
2578                 reiserfs_prepare_for_journal(sb, bh, 1);
2579                 journal_mark_dirty(current->journal_info, bh);
2580                 if (!journal_quota)
2581                         reiserfs_add_ordered_list(inode, bh);
2582                 reiserfs_write_unlock(sb);
2583                 brelse(bh);
2584                 offset = 0;
2585                 towrite -= tocopy;
2586                 data += tocopy;
2587                 blk++;
2588         }
2589 out:
2590         if (len == towrite)
2591                 return err;
2592         if (inode->i_size < off + len - towrite)
2593                 i_size_write(inode, off + len - towrite);
2594         inode->i_mtime = inode->i_ctime = current_time(inode);
2595         mark_inode_dirty(inode);
2596         return len - towrite;
2597 }
2598 
2599 #endif
2600 
2601 static struct dentry *get_super_block(struct file_system_type *fs_type,
2602                            int flags, const char *dev_name,
2603                            void *data)
2604 {
2605         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2606 }
2607 
2608 static int __init init_reiserfs_fs(void)
2609 {
2610         int ret;
2611 
2612         ret = init_inodecache();
2613         if (ret)
2614                 return ret;
2615 
2616         reiserfs_proc_info_global_init();
2617 
2618         ret = register_filesystem(&reiserfs_fs_type);
2619         if (ret)
2620                 goto out;
2621 
2622         return 0;
2623 out:
2624         reiserfs_proc_info_global_done();
2625         destroy_inodecache();
2626 
2627         return ret;
2628 }
2629 
2630 static void __exit exit_reiserfs_fs(void)
2631 {
2632         reiserfs_proc_info_global_done();
2633         unregister_filesystem(&reiserfs_fs_type);
2634         destroy_inodecache();
2635 }
2636 
2637 struct file_system_type reiserfs_fs_type = {
2638         .owner = THIS_MODULE,
2639         .name = "reiserfs",
2640         .mount = get_super_block,
2641         .kill_sb = reiserfs_kill_sb,
2642         .fs_flags = FS_REQUIRES_DEV,
2643 };
2644 MODULE_ALIAS_FS("reiserfs");
2645 
2646 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2647 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2648 MODULE_LICENSE("GPL");
2649 
2650 module_init(init_reiserfs_fs);
2651 module_exit(exit_reiserfs_fs);
2652 

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