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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/journal.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * journal.c
  5  *
  6  * Defines functions of journalling api
  7  *
  8  * Copyright (C) 2003, 2004 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  */
 25 
 26 #include <linux/fs.h>
 27 #include <linux/types.h>
 28 #include <linux/slab.h>
 29 #include <linux/highmem.h>
 30 #include <linux/kthread.h>
 31 #include <linux/time.h>
 32 #include <linux/random.h>
 33 #include <linux/delay.h>
 34 
 35 #include <cluster/masklog.h>
 36 
 37 #include "ocfs2.h"
 38 
 39 #include "alloc.h"
 40 #include "blockcheck.h"
 41 #include "dir.h"
 42 #include "dlmglue.h"
 43 #include "extent_map.h"
 44 #include "heartbeat.h"
 45 #include "inode.h"
 46 #include "journal.h"
 47 #include "localalloc.h"
 48 #include "slot_map.h"
 49 #include "super.h"
 50 #include "sysfile.h"
 51 #include "uptodate.h"
 52 #include "quota.h"
 53 #include "file.h"
 54 #include "namei.h"
 55 
 56 #include "buffer_head_io.h"
 57 #include "ocfs2_trace.h"
 58 
 59 DEFINE_SPINLOCK(trans_inc_lock);
 60 
 61 #define ORPHAN_SCAN_SCHEDULE_TIMEOUT 300000
 62 
 63 static int ocfs2_force_read_journal(struct inode *inode);
 64 static int ocfs2_recover_node(struct ocfs2_super *osb,
 65                               int node_num, int slot_num);
 66 static int __ocfs2_recovery_thread(void *arg);
 67 static int ocfs2_commit_cache(struct ocfs2_super *osb);
 68 static int __ocfs2_wait_on_mount(struct ocfs2_super *osb, int quota);
 69 static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
 70                                       int dirty, int replayed);
 71 static int ocfs2_trylock_journal(struct ocfs2_super *osb,
 72                                  int slot_num);
 73 static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 74                                  int slot,
 75                                  enum ocfs2_orphan_reco_type orphan_reco_type);
 76 static int ocfs2_commit_thread(void *arg);
 77 static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
 78                                             int slot_num,
 79                                             struct ocfs2_dinode *la_dinode,
 80                                             struct ocfs2_dinode *tl_dinode,
 81                                             struct ocfs2_quota_recovery *qrec,
 82                                             enum ocfs2_orphan_reco_type orphan_reco_type);
 83 
 84 static inline int ocfs2_wait_on_mount(struct ocfs2_super *osb)
 85 {
 86         return __ocfs2_wait_on_mount(osb, 0);
 87 }
 88 
 89 static inline int ocfs2_wait_on_quotas(struct ocfs2_super *osb)
 90 {
 91         return __ocfs2_wait_on_mount(osb, 1);
 92 }
 93 
 94 /*
 95  * This replay_map is to track online/offline slots, so we could recover
 96  * offline slots during recovery and mount
 97  */
 98 
 99 enum ocfs2_replay_state {
100         REPLAY_UNNEEDED = 0,    /* Replay is not needed, so ignore this map */
101         REPLAY_NEEDED,          /* Replay slots marked in rm_replay_slots */
102         REPLAY_DONE             /* Replay was already queued */
103 };
104 
105 struct ocfs2_replay_map {
106         unsigned int rm_slots;
107         enum ocfs2_replay_state rm_state;
108         unsigned char rm_replay_slots[0];
109 };
110 
111 static void ocfs2_replay_map_set_state(struct ocfs2_super *osb, int state)
112 {
113         if (!osb->replay_map)
114                 return;
115 
116         /* If we've already queued the replay, we don't have any more to do */
117         if (osb->replay_map->rm_state == REPLAY_DONE)
118                 return;
119 
120         osb->replay_map->rm_state = state;
121 }
122 
123 int ocfs2_compute_replay_slots(struct ocfs2_super *osb)
124 {
125         struct ocfs2_replay_map *replay_map;
126         int i, node_num;
127 
128         /* If replay map is already set, we don't do it again */
129         if (osb->replay_map)
130                 return 0;
131 
132         replay_map = kzalloc(sizeof(struct ocfs2_replay_map) +
133                              (osb->max_slots * sizeof(char)), GFP_KERNEL);
134 
135         if (!replay_map) {
136                 mlog_errno(-ENOMEM);
137                 return -ENOMEM;
138         }
139 
140         spin_lock(&osb->osb_lock);
141 
142         replay_map->rm_slots = osb->max_slots;
143         replay_map->rm_state = REPLAY_UNNEEDED;
144 
145         /* set rm_replay_slots for offline slot(s) */
146         for (i = 0; i < replay_map->rm_slots; i++) {
147                 if (ocfs2_slot_to_node_num_locked(osb, i, &node_num) == -ENOENT)
148                         replay_map->rm_replay_slots[i] = 1;
149         }
150 
151         osb->replay_map = replay_map;
152         spin_unlock(&osb->osb_lock);
153         return 0;
154 }
155 
156 static void ocfs2_queue_replay_slots(struct ocfs2_super *osb,
157                 enum ocfs2_orphan_reco_type orphan_reco_type)
158 {
159         struct ocfs2_replay_map *replay_map = osb->replay_map;
160         int i;
161 
162         if (!replay_map)
163                 return;
164 
165         if (replay_map->rm_state != REPLAY_NEEDED)
166                 return;
167 
168         for (i = 0; i < replay_map->rm_slots; i++)
169                 if (replay_map->rm_replay_slots[i])
170                         ocfs2_queue_recovery_completion(osb->journal, i, NULL,
171                                                         NULL, NULL,
172                                                         orphan_reco_type);
173         replay_map->rm_state = REPLAY_DONE;
174 }
175 
176 static void ocfs2_free_replay_slots(struct ocfs2_super *osb)
177 {
178         struct ocfs2_replay_map *replay_map = osb->replay_map;
179 
180         if (!osb->replay_map)
181                 return;
182 
183         kfree(replay_map);
184         osb->replay_map = NULL;
185 }
186 
187 int ocfs2_recovery_init(struct ocfs2_super *osb)
188 {
189         struct ocfs2_recovery_map *rm;
190 
191         mutex_init(&osb->recovery_lock);
192         osb->disable_recovery = 0;
193         osb->recovery_thread_task = NULL;
194         init_waitqueue_head(&osb->recovery_event);
195 
196         rm = kzalloc(sizeof(struct ocfs2_recovery_map) +
197                      osb->max_slots * sizeof(unsigned int),
198                      GFP_KERNEL);
199         if (!rm) {
200                 mlog_errno(-ENOMEM);
201                 return -ENOMEM;
202         }
203 
204         rm->rm_entries = (unsigned int *)((char *)rm +
205                                           sizeof(struct ocfs2_recovery_map));
206         osb->recovery_map = rm;
207 
208         return 0;
209 }
210 
211 /* we can't grab the goofy sem lock from inside wait_event, so we use
212  * memory barriers to make sure that we'll see the null task before
213  * being woken up */
214 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
215 {
216         mb();
217         return osb->recovery_thread_task != NULL;
218 }
219 
220 void ocfs2_recovery_exit(struct ocfs2_super *osb)
221 {
222         struct ocfs2_recovery_map *rm;
223 
224         /* disable any new recovery threads and wait for any currently
225          * running ones to exit. Do this before setting the vol_state. */
226         mutex_lock(&osb->recovery_lock);
227         osb->disable_recovery = 1;
228         mutex_unlock(&osb->recovery_lock);
229         wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
230 
231         /* At this point, we know that no more recovery threads can be
232          * launched, so wait for any recovery completion work to
233          * complete. */
234         flush_workqueue(osb->ocfs2_wq);
235 
236         /*
237          * Now that recovery is shut down, and the osb is about to be
238          * freed,  the osb_lock is not taken here.
239          */
240         rm = osb->recovery_map;
241         /* XXX: Should we bug if there are dirty entries? */
242 
243         kfree(rm);
244 }
245 
246 static int __ocfs2_recovery_map_test(struct ocfs2_super *osb,
247                                      unsigned int node_num)
248 {
249         int i;
250         struct ocfs2_recovery_map *rm = osb->recovery_map;
251 
252         assert_spin_locked(&osb->osb_lock);
253 
254         for (i = 0; i < rm->rm_used; i++) {
255                 if (rm->rm_entries[i] == node_num)
256                         return 1;
257         }
258 
259         return 0;
260 }
261 
262 /* Behaves like test-and-set.  Returns the previous value */
263 static int ocfs2_recovery_map_set(struct ocfs2_super *osb,
264                                   unsigned int node_num)
265 {
266         struct ocfs2_recovery_map *rm = osb->recovery_map;
267 
268         spin_lock(&osb->osb_lock);
269         if (__ocfs2_recovery_map_test(osb, node_num)) {
270                 spin_unlock(&osb->osb_lock);
271                 return 1;
272         }
273 
274         /* XXX: Can this be exploited? Not from o2dlm... */
275         BUG_ON(rm->rm_used >= osb->max_slots);
276 
277         rm->rm_entries[rm->rm_used] = node_num;
278         rm->rm_used++;
279         spin_unlock(&osb->osb_lock);
280 
281         return 0;
282 }
283 
284 static void ocfs2_recovery_map_clear(struct ocfs2_super *osb,
285                                      unsigned int node_num)
286 {
287         int i;
288         struct ocfs2_recovery_map *rm = osb->recovery_map;
289 
290         spin_lock(&osb->osb_lock);
291 
292         for (i = 0; i < rm->rm_used; i++) {
293                 if (rm->rm_entries[i] == node_num)
294                         break;
295         }
296 
297         if (i < rm->rm_used) {
298                 /* XXX: be careful with the pointer math */
299                 memmove(&(rm->rm_entries[i]), &(rm->rm_entries[i + 1]),
300                         (rm->rm_used - i - 1) * sizeof(unsigned int));
301                 rm->rm_used--;
302         }
303 
304         spin_unlock(&osb->osb_lock);
305 }
306 
307 static int ocfs2_commit_cache(struct ocfs2_super *osb)
308 {
309         int status = 0;
310         unsigned int flushed;
311         struct ocfs2_journal *journal = NULL;
312 
313         journal = osb->journal;
314 
315         /* Flush all pending commits and checkpoint the journal. */
316         down_write(&journal->j_trans_barrier);
317 
318         flushed = atomic_read(&journal->j_num_trans);
319         trace_ocfs2_commit_cache_begin(flushed);
320         if (flushed == 0) {
321                 up_write(&journal->j_trans_barrier);
322                 goto finally;
323         }
324 
325         jbd2_journal_lock_updates(journal->j_journal);
326         status = jbd2_journal_flush(journal->j_journal);
327         jbd2_journal_unlock_updates(journal->j_journal);
328         if (status < 0) {
329                 up_write(&journal->j_trans_barrier);
330                 mlog_errno(status);
331                 goto finally;
332         }
333 
334         ocfs2_inc_trans_id(journal);
335 
336         flushed = atomic_read(&journal->j_num_trans);
337         atomic_set(&journal->j_num_trans, 0);
338         up_write(&journal->j_trans_barrier);
339 
340         trace_ocfs2_commit_cache_end(journal->j_trans_id, flushed);
341 
342         ocfs2_wake_downconvert_thread(osb);
343         wake_up(&journal->j_checkpointed);
344 finally:
345         return status;
346 }
347 
348 handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
349 {
350         journal_t *journal = osb->journal->j_journal;
351         handle_t *handle;
352 
353         BUG_ON(!osb || !osb->journal->j_journal);
354 
355         if (ocfs2_is_hard_readonly(osb))
356                 return ERR_PTR(-EROFS);
357 
358         BUG_ON(osb->journal->j_state == OCFS2_JOURNAL_FREE);
359         BUG_ON(max_buffs <= 0);
360 
361         /* Nested transaction? Just return the handle... */
362         if (journal_current_handle())
363                 return jbd2_journal_start(journal, max_buffs);
364 
365         sb_start_intwrite(osb->sb);
366 
367         down_read(&osb->journal->j_trans_barrier);
368 
369         handle = jbd2_journal_start(journal, max_buffs);
370         if (IS_ERR(handle)) {
371                 up_read(&osb->journal->j_trans_barrier);
372                 sb_end_intwrite(osb->sb);
373 
374                 mlog_errno(PTR_ERR(handle));
375 
376                 if (is_journal_aborted(journal)) {
377                         ocfs2_abort(osb->sb, "Detected aborted journal\n");
378                         handle = ERR_PTR(-EROFS);
379                 }
380         } else {
381                 if (!ocfs2_mount_local(osb))
382                         atomic_inc(&(osb->journal->j_num_trans));
383         }
384 
385         return handle;
386 }
387 
388 int ocfs2_commit_trans(struct ocfs2_super *osb,
389                        handle_t *handle)
390 {
391         int ret, nested;
392         struct ocfs2_journal *journal = osb->journal;
393 
394         BUG_ON(!handle);
395 
396         nested = handle->h_ref > 1;
397         ret = jbd2_journal_stop(handle);
398         if (ret < 0)
399                 mlog_errno(ret);
400 
401         if (!nested) {
402                 up_read(&journal->j_trans_barrier);
403                 sb_end_intwrite(osb->sb);
404         }
405 
406         return ret;
407 }
408 
409 /*
410  * 'nblocks' is what you want to add to the current transaction.
411  *
412  * This might call jbd2_journal_restart() which will commit dirty buffers
413  * and then restart the transaction. Before calling
414  * ocfs2_extend_trans(), any changed blocks should have been
415  * dirtied. After calling it, all blocks which need to be changed must
416  * go through another set of journal_access/journal_dirty calls.
417  *
418  * WARNING: This will not release any semaphores or disk locks taken
419  * during the transaction, so make sure they were taken *before*
420  * start_trans or we'll have ordering deadlocks.
421  *
422  * WARNING2: Note that we do *not* drop j_trans_barrier here. This is
423  * good because transaction ids haven't yet been recorded on the
424  * cluster locks associated with this handle.
425  */
426 int ocfs2_extend_trans(handle_t *handle, int nblocks)
427 {
428         int status, old_nblocks;
429 
430         BUG_ON(!handle);
431         BUG_ON(nblocks < 0);
432 
433         if (!nblocks)
434                 return 0;
435 
436         old_nblocks = handle->h_buffer_credits;
437 
438         trace_ocfs2_extend_trans(old_nblocks, nblocks);
439 
440 #ifdef CONFIG_OCFS2_DEBUG_FS
441         status = 1;
442 #else
443         status = jbd2_journal_extend(handle, nblocks);
444         if (status < 0) {
445                 mlog_errno(status);
446                 goto bail;
447         }
448 #endif
449 
450         if (status > 0) {
451                 trace_ocfs2_extend_trans_restart(old_nblocks + nblocks);
452                 status = jbd2_journal_restart(handle,
453                                               old_nblocks + nblocks);
454                 if (status < 0) {
455                         mlog_errno(status);
456                         goto bail;
457                 }
458         }
459 
460         status = 0;
461 bail:
462         return status;
463 }
464 
465 /*
466  * If we have fewer than thresh credits, extend by OCFS2_MAX_TRANS_DATA.
467  * If that fails, restart the transaction & regain write access for the
468  * buffer head which is used for metadata modifications.
469  * Taken from Ext4: extend_or_restart_transaction()
470  */
471 int ocfs2_allocate_extend_trans(handle_t *handle, int thresh)
472 {
473         int status, old_nblks;
474 
475         BUG_ON(!handle);
476 
477         old_nblks = handle->h_buffer_credits;
478         trace_ocfs2_allocate_extend_trans(old_nblks, thresh);
479 
480         if (old_nblks < thresh)
481                 return 0;
482 
483         status = jbd2_journal_extend(handle, OCFS2_MAX_TRANS_DATA);
484         if (status < 0) {
485                 mlog_errno(status);
486                 goto bail;
487         }
488 
489         if (status > 0) {
490                 status = jbd2_journal_restart(handle, OCFS2_MAX_TRANS_DATA);
491                 if (status < 0)
492                         mlog_errno(status);
493         }
494 
495 bail:
496         return status;
497 }
498 
499 
500 struct ocfs2_triggers {
501         struct jbd2_buffer_trigger_type ot_triggers;
502         int                             ot_offset;
503 };
504 
505 static inline struct ocfs2_triggers *to_ocfs2_trigger(struct jbd2_buffer_trigger_type *triggers)
506 {
507         return container_of(triggers, struct ocfs2_triggers, ot_triggers);
508 }
509 
510 static void ocfs2_frozen_trigger(struct jbd2_buffer_trigger_type *triggers,
511                                  struct buffer_head *bh,
512                                  void *data, size_t size)
513 {
514         struct ocfs2_triggers *ot = to_ocfs2_trigger(triggers);
515 
516         /*
517          * We aren't guaranteed to have the superblock here, so we
518          * must unconditionally compute the ecc data.
519          * __ocfs2_journal_access() will only set the triggers if
520          * metaecc is enabled.
521          */
522         ocfs2_block_check_compute(data, size, data + ot->ot_offset);
523 }
524 
525 /*
526  * Quota blocks have their own trigger because the struct ocfs2_block_check
527  * offset depends on the blocksize.
528  */
529 static void ocfs2_dq_frozen_trigger(struct jbd2_buffer_trigger_type *triggers,
530                                  struct buffer_head *bh,
531                                  void *data, size_t size)
532 {
533         struct ocfs2_disk_dqtrailer *dqt =
534                 ocfs2_block_dqtrailer(size, data);
535 
536         /*
537          * We aren't guaranteed to have the superblock here, so we
538          * must unconditionally compute the ecc data.
539          * __ocfs2_journal_access() will only set the triggers if
540          * metaecc is enabled.
541          */
542         ocfs2_block_check_compute(data, size, &dqt->dq_check);
543 }
544 
545 /*
546  * Directory blocks also have their own trigger because the
547  * struct ocfs2_block_check offset depends on the blocksize.
548  */
549 static void ocfs2_db_frozen_trigger(struct jbd2_buffer_trigger_type *triggers,
550                                  struct buffer_head *bh,
551                                  void *data, size_t size)
552 {
553         struct ocfs2_dir_block_trailer *trailer =
554                 ocfs2_dir_trailer_from_size(size, data);
555 
556         /*
557          * We aren't guaranteed to have the superblock here, so we
558          * must unconditionally compute the ecc data.
559          * __ocfs2_journal_access() will only set the triggers if
560          * metaecc is enabled.
561          */
562         ocfs2_block_check_compute(data, size, &trailer->db_check);
563 }
564 
565 static void ocfs2_abort_trigger(struct jbd2_buffer_trigger_type *triggers,
566                                 struct buffer_head *bh)
567 {
568         mlog(ML_ERROR,
569              "ocfs2_abort_trigger called by JBD2.  bh = 0x%lx, "
570              "bh->b_blocknr = %llu\n",
571              (unsigned long)bh,
572              (unsigned long long)bh->b_blocknr);
573 
574         ocfs2_error(bh->b_bdev->bd_super,
575                     "JBD2 has aborted our journal, ocfs2 cannot continue\n");
576 }
577 
578 static struct ocfs2_triggers di_triggers = {
579         .ot_triggers = {
580                 .t_frozen = ocfs2_frozen_trigger,
581                 .t_abort = ocfs2_abort_trigger,
582         },
583         .ot_offset      = offsetof(struct ocfs2_dinode, i_check),
584 };
585 
586 static struct ocfs2_triggers eb_triggers = {
587         .ot_triggers = {
588                 .t_frozen = ocfs2_frozen_trigger,
589                 .t_abort = ocfs2_abort_trigger,
590         },
591         .ot_offset      = offsetof(struct ocfs2_extent_block, h_check),
592 };
593 
594 static struct ocfs2_triggers rb_triggers = {
595         .ot_triggers = {
596                 .t_frozen = ocfs2_frozen_trigger,
597                 .t_abort = ocfs2_abort_trigger,
598         },
599         .ot_offset      = offsetof(struct ocfs2_refcount_block, rf_check),
600 };
601 
602 static struct ocfs2_triggers gd_triggers = {
603         .ot_triggers = {
604                 .t_frozen = ocfs2_frozen_trigger,
605                 .t_abort = ocfs2_abort_trigger,
606         },
607         .ot_offset      = offsetof(struct ocfs2_group_desc, bg_check),
608 };
609 
610 static struct ocfs2_triggers db_triggers = {
611         .ot_triggers = {
612                 .t_frozen = ocfs2_db_frozen_trigger,
613                 .t_abort = ocfs2_abort_trigger,
614         },
615 };
616 
617 static struct ocfs2_triggers xb_triggers = {
618         .ot_triggers = {
619                 .t_frozen = ocfs2_frozen_trigger,
620                 .t_abort = ocfs2_abort_trigger,
621         },
622         .ot_offset      = offsetof(struct ocfs2_xattr_block, xb_check),
623 };
624 
625 static struct ocfs2_triggers dq_triggers = {
626         .ot_triggers = {
627                 .t_frozen = ocfs2_dq_frozen_trigger,
628                 .t_abort = ocfs2_abort_trigger,
629         },
630 };
631 
632 static struct ocfs2_triggers dr_triggers = {
633         .ot_triggers = {
634                 .t_frozen = ocfs2_frozen_trigger,
635                 .t_abort = ocfs2_abort_trigger,
636         },
637         .ot_offset      = offsetof(struct ocfs2_dx_root_block, dr_check),
638 };
639 
640 static struct ocfs2_triggers dl_triggers = {
641         .ot_triggers = {
642                 .t_frozen = ocfs2_frozen_trigger,
643                 .t_abort = ocfs2_abort_trigger,
644         },
645         .ot_offset      = offsetof(struct ocfs2_dx_leaf, dl_check),
646 };
647 
648 static int __ocfs2_journal_access(handle_t *handle,
649                                   struct ocfs2_caching_info *ci,
650                                   struct buffer_head *bh,
651                                   struct ocfs2_triggers *triggers,
652                                   int type)
653 {
654         int status;
655         struct ocfs2_super *osb =
656                 OCFS2_SB(ocfs2_metadata_cache_get_super(ci));
657 
658         BUG_ON(!ci || !ci->ci_ops);
659         BUG_ON(!handle);
660         BUG_ON(!bh);
661 
662         trace_ocfs2_journal_access(
663                 (unsigned long long)ocfs2_metadata_cache_owner(ci),
664                 (unsigned long long)bh->b_blocknr, type, bh->b_size);
665 
666         /* we can safely remove this assertion after testing. */
667         if (!buffer_uptodate(bh)) {
668                 mlog(ML_ERROR, "giving me a buffer that's not uptodate!\n");
669                 mlog(ML_ERROR, "b_blocknr=%llu\n",
670                      (unsigned long long)bh->b_blocknr);
671 
672                 lock_buffer(bh);
673                 /*
674                  * A previous attempt to write this buffer head failed.
675                  * Nothing we can do but to retry the write and hope for
676                  * the best.
677                  */
678                 if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) {
679                         clear_buffer_write_io_error(bh);
680                         set_buffer_uptodate(bh);
681                 }
682 
683                 if (!buffer_uptodate(bh)) {
684                         unlock_buffer(bh);
685                         return -EIO;
686                 }
687                 unlock_buffer(bh);
688         }
689 
690         /* Set the current transaction information on the ci so
691          * that the locking code knows whether it can drop it's locks
692          * on this ci or not. We're protected from the commit
693          * thread updating the current transaction id until
694          * ocfs2_commit_trans() because ocfs2_start_trans() took
695          * j_trans_barrier for us. */
696         ocfs2_set_ci_lock_trans(osb->journal, ci);
697 
698         ocfs2_metadata_cache_io_lock(ci);
699         switch (type) {
700         case OCFS2_JOURNAL_ACCESS_CREATE:
701         case OCFS2_JOURNAL_ACCESS_WRITE:
702                 status = jbd2_journal_get_write_access(handle, bh);
703                 break;
704 
705         case OCFS2_JOURNAL_ACCESS_UNDO:
706                 status = jbd2_journal_get_undo_access(handle, bh);
707                 break;
708 
709         default:
710                 status = -EINVAL;
711                 mlog(ML_ERROR, "Unknown access type!\n");
712         }
713         if (!status && ocfs2_meta_ecc(osb) && triggers)
714                 jbd2_journal_set_triggers(bh, &triggers->ot_triggers);
715         ocfs2_metadata_cache_io_unlock(ci);
716 
717         if (status < 0)
718                 mlog(ML_ERROR, "Error %d getting %d access to buffer!\n",
719                      status, type);
720 
721         return status;
722 }
723 
724 int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci,
725                             struct buffer_head *bh, int type)
726 {
727         return __ocfs2_journal_access(handle, ci, bh, &di_triggers, type);
728 }
729 
730 int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci,
731                             struct buffer_head *bh, int type)
732 {
733         return __ocfs2_journal_access(handle, ci, bh, &eb_triggers, type);
734 }
735 
736 int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci,
737                             struct buffer_head *bh, int type)
738 {
739         return __ocfs2_journal_access(handle, ci, bh, &rb_triggers,
740                                       type);
741 }
742 
743 int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci,
744                             struct buffer_head *bh, int type)
745 {
746         return __ocfs2_journal_access(handle, ci, bh, &gd_triggers, type);
747 }
748 
749 int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci,
750                             struct buffer_head *bh, int type)
751 {
752         return __ocfs2_journal_access(handle, ci, bh, &db_triggers, type);
753 }
754 
755 int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci,
756                             struct buffer_head *bh, int type)
757 {
758         return __ocfs2_journal_access(handle, ci, bh, &xb_triggers, type);
759 }
760 
761 int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci,
762                             struct buffer_head *bh, int type)
763 {
764         return __ocfs2_journal_access(handle, ci, bh, &dq_triggers, type);
765 }
766 
767 int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci,
768                             struct buffer_head *bh, int type)
769 {
770         return __ocfs2_journal_access(handle, ci, bh, &dr_triggers, type);
771 }
772 
773 int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci,
774                             struct buffer_head *bh, int type)
775 {
776         return __ocfs2_journal_access(handle, ci, bh, &dl_triggers, type);
777 }
778 
779 int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci,
780                          struct buffer_head *bh, int type)
781 {
782         return __ocfs2_journal_access(handle, ci, bh, NULL, type);
783 }
784 
785 void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh)
786 {
787         int status;
788 
789         trace_ocfs2_journal_dirty((unsigned long long)bh->b_blocknr);
790 
791         status = jbd2_journal_dirty_metadata(handle, bh);
792         if (status) {
793                 mlog_errno(status);
794                 if (!is_handle_aborted(handle)) {
795                         journal_t *journal = handle->h_transaction->t_journal;
796                         struct super_block *sb = bh->b_bdev->bd_super;
797 
798                         mlog(ML_ERROR, "jbd2_journal_dirty_metadata failed. "
799                                         "Aborting transaction and journal.\n");
800                         handle->h_err = status;
801                         jbd2_journal_abort_handle(handle);
802                         jbd2_journal_abort(journal, status);
803                         ocfs2_abort(sb, "Journal already aborted.\n");
804                 }
805         }
806 }
807 
808 #define OCFS2_DEFAULT_COMMIT_INTERVAL   (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE)
809 
810 void ocfs2_set_journal_params(struct ocfs2_super *osb)
811 {
812         journal_t *journal = osb->journal->j_journal;
813         unsigned long commit_interval = OCFS2_DEFAULT_COMMIT_INTERVAL;
814 
815         if (osb->osb_commit_interval)
816                 commit_interval = osb->osb_commit_interval;
817 
818         write_lock(&journal->j_state_lock);
819         journal->j_commit_interval = commit_interval;
820         if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
821                 journal->j_flags |= JBD2_BARRIER;
822         else
823                 journal->j_flags &= ~JBD2_BARRIER;
824         write_unlock(&journal->j_state_lock);
825 }
826 
827 int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)
828 {
829         int status = -1;
830         struct inode *inode = NULL; /* the journal inode */
831         journal_t *j_journal = NULL;
832         struct ocfs2_dinode *di = NULL;
833         struct buffer_head *bh = NULL;
834         struct ocfs2_super *osb;
835         int inode_lock = 0;
836 
837         BUG_ON(!journal);
838 
839         osb = journal->j_osb;
840 
841         /* already have the inode for our journal */
842         inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
843                                             osb->slot_num);
844         if (inode == NULL) {
845                 status = -EACCES;
846                 mlog_errno(status);
847                 goto done;
848         }
849         if (is_bad_inode(inode)) {
850                 mlog(ML_ERROR, "access error (bad inode)\n");
851                 iput(inode);
852                 inode = NULL;
853                 status = -EACCES;
854                 goto done;
855         }
856 
857         SET_INODE_JOURNAL(inode);
858         OCFS2_I(inode)->ip_open_count++;
859 
860         /* Skip recovery waits here - journal inode metadata never
861          * changes in a live cluster so it can be considered an
862          * exception to the rule. */
863         status = ocfs2_inode_lock_full(inode, &bh, 1, OCFS2_META_LOCK_RECOVERY);
864         if (status < 0) {
865                 if (status != -ERESTARTSYS)
866                         mlog(ML_ERROR, "Could not get lock on journal!\n");
867                 goto done;
868         }
869 
870         inode_lock = 1;
871         di = (struct ocfs2_dinode *)bh->b_data;
872 
873         if (i_size_read(inode) <  OCFS2_MIN_JOURNAL_SIZE) {
874                 mlog(ML_ERROR, "Journal file size (%lld) is too small!\n",
875                      i_size_read(inode));
876                 status = -EINVAL;
877                 goto done;
878         }
879 
880         trace_ocfs2_journal_init(i_size_read(inode),
881                                  (unsigned long long)inode->i_blocks,
882                                  OCFS2_I(inode)->ip_clusters);
883 
884         /* call the kernels journal init function now */
885         j_journal = jbd2_journal_init_inode(inode);
886         if (j_journal == NULL) {
887                 mlog(ML_ERROR, "Linux journal layer error\n");
888                 status = -EINVAL;
889                 goto done;
890         }
891 
892         trace_ocfs2_journal_init_maxlen(j_journal->j_maxlen);
893 
894         *dirty = (le32_to_cpu(di->id1.journal1.ij_flags) &
895                   OCFS2_JOURNAL_DIRTY_FL);
896 
897         journal->j_journal = j_journal;
898         journal->j_inode = inode;
899         journal->j_bh = bh;
900 
901         ocfs2_set_journal_params(osb);
902 
903         journal->j_state = OCFS2_JOURNAL_LOADED;
904 
905         status = 0;
906 done:
907         if (status < 0) {
908                 if (inode_lock)
909                         ocfs2_inode_unlock(inode, 1);
910                 brelse(bh);
911                 if (inode) {
912                         OCFS2_I(inode)->ip_open_count--;
913                         iput(inode);
914                 }
915         }
916 
917         return status;
918 }
919 
920 static void ocfs2_bump_recovery_generation(struct ocfs2_dinode *di)
921 {
922         le32_add_cpu(&(di->id1.journal1.ij_recovery_generation), 1);
923 }
924 
925 static u32 ocfs2_get_recovery_generation(struct ocfs2_dinode *di)
926 {
927         return le32_to_cpu(di->id1.journal1.ij_recovery_generation);
928 }
929 
930 static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
931                                       int dirty, int replayed)
932 {
933         int status;
934         unsigned int flags;
935         struct ocfs2_journal *journal = osb->journal;
936         struct buffer_head *bh = journal->j_bh;
937         struct ocfs2_dinode *fe;
938 
939         fe = (struct ocfs2_dinode *)bh->b_data;
940 
941         /* The journal bh on the osb always comes from ocfs2_journal_init()
942          * and was validated there inside ocfs2_inode_lock_full().  It's a
943          * code bug if we mess it up. */
944         BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
945 
946         flags = le32_to_cpu(fe->id1.journal1.ij_flags);
947         if (dirty)
948                 flags |= OCFS2_JOURNAL_DIRTY_FL;
949         else
950                 flags &= ~OCFS2_JOURNAL_DIRTY_FL;
951         fe->id1.journal1.ij_flags = cpu_to_le32(flags);
952 
953         if (replayed)
954                 ocfs2_bump_recovery_generation(fe);
955 
956         ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &fe->i_check);
957         status = ocfs2_write_block(osb, bh, INODE_CACHE(journal->j_inode));
958         if (status < 0)
959                 mlog_errno(status);
960 
961         return status;
962 }
963 
964 /*
965  * If the journal has been kmalloc'd it needs to be freed after this
966  * call.
967  */
968 void ocfs2_journal_shutdown(struct ocfs2_super *osb)
969 {
970         struct ocfs2_journal *journal = NULL;
971         int status = 0;
972         struct inode *inode = NULL;
973         int num_running_trans = 0;
974 
975         BUG_ON(!osb);
976 
977         journal = osb->journal;
978         if (!journal)
979                 goto done;
980 
981         inode = journal->j_inode;
982 
983         if (journal->j_state != OCFS2_JOURNAL_LOADED)
984                 goto done;
985 
986         /* need to inc inode use count - jbd2_journal_destroy will iput. */
987         if (!igrab(inode))
988                 BUG();
989 
990         num_running_trans = atomic_read(&(osb->journal->j_num_trans));
991         trace_ocfs2_journal_shutdown(num_running_trans);
992 
993         /* Do a commit_cache here. It will flush our journal, *and*
994          * release any locks that are still held.
995          * set the SHUTDOWN flag and release the trans lock.
996          * the commit thread will take the trans lock for us below. */
997         journal->j_state = OCFS2_JOURNAL_IN_SHUTDOWN;
998 
999         /* The OCFS2_JOURNAL_IN_SHUTDOWN will signal to commit_cache to not
1000          * drop the trans_lock (which we want to hold until we
1001          * completely destroy the journal. */
1002         if (osb->commit_task) {
1003                 /* Wait for the commit thread */
1004                 trace_ocfs2_journal_shutdown_wait(osb->commit_task);
1005                 kthread_stop(osb->commit_task);
1006                 osb->commit_task = NULL;
1007         }
1008 
1009         BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0);
1010 
1011         if (ocfs2_mount_local(osb)) {
1012                 jbd2_journal_lock_updates(journal->j_journal);
1013                 status = jbd2_journal_flush(journal->j_journal);
1014                 jbd2_journal_unlock_updates(journal->j_journal);
1015                 if (status < 0)
1016                         mlog_errno(status);
1017         }
1018 
1019         if (status == 0) {
1020                 /*
1021                  * Do not toggle if flush was unsuccessful otherwise
1022                  * will leave dirty metadata in a "clean" journal
1023                  */
1024                 status = ocfs2_journal_toggle_dirty(osb, 0, 0);
1025                 if (status < 0)
1026                         mlog_errno(status);
1027         }
1028 
1029         /* Shutdown the kernel journal system */
1030         jbd2_journal_destroy(journal->j_journal);
1031         journal->j_journal = NULL;
1032 
1033         OCFS2_I(inode)->ip_open_count--;
1034 
1035         /* unlock our journal */
1036         ocfs2_inode_unlock(inode, 1);
1037 
1038         brelse(journal->j_bh);
1039         journal->j_bh = NULL;
1040 
1041         journal->j_state = OCFS2_JOURNAL_FREE;
1042 
1043 //      up_write(&journal->j_trans_barrier);
1044 done:
1045         iput(inode);
1046 }
1047 
1048 static void ocfs2_clear_journal_error(struct super_block *sb,
1049                                       journal_t *journal,
1050                                       int slot)
1051 {
1052         int olderr;
1053 
1054         olderr = jbd2_journal_errno(journal);
1055         if (olderr) {
1056                 mlog(ML_ERROR, "File system error %d recorded in "
1057                      "journal %u.\n", olderr, slot);
1058                 mlog(ML_ERROR, "File system on device %s needs checking.\n",
1059                      sb->s_id);
1060 
1061                 jbd2_journal_ack_err(journal);
1062                 jbd2_journal_clear_err(journal);
1063         }
1064 }
1065 
1066 int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed)
1067 {
1068         int status = 0;
1069         struct ocfs2_super *osb;
1070 
1071         BUG_ON(!journal);
1072 
1073         osb = journal->j_osb;
1074 
1075         status = jbd2_journal_load(journal->j_journal);
1076         if (status < 0) {
1077                 mlog(ML_ERROR, "Failed to load journal!\n");
1078                 goto done;
1079         }
1080 
1081         ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num);
1082 
1083         status = ocfs2_journal_toggle_dirty(osb, 1, replayed);
1084         if (status < 0) {
1085                 mlog_errno(status);
1086                 goto done;
1087         }
1088 
1089         /* Launch the commit thread */
1090         if (!local) {
1091                 osb->commit_task = kthread_run(ocfs2_commit_thread, osb,
1092                                 "ocfs2cmt-%s", osb->uuid_str);
1093                 if (IS_ERR(osb->commit_task)) {
1094                         status = PTR_ERR(osb->commit_task);
1095                         osb->commit_task = NULL;
1096                         mlog(ML_ERROR, "unable to launch ocfs2commit thread, "
1097                              "error=%d", status);
1098                         goto done;
1099                 }
1100         } else
1101                 osb->commit_task = NULL;
1102 
1103 done:
1104         return status;
1105 }
1106 
1107 
1108 /* 'full' flag tells us whether we clear out all blocks or if we just
1109  * mark the journal clean */
1110 int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full)
1111 {
1112         int status;
1113 
1114         BUG_ON(!journal);
1115 
1116         status = jbd2_journal_wipe(journal->j_journal, full);
1117         if (status < 0) {
1118                 mlog_errno(status);
1119                 goto bail;
1120         }
1121 
1122         status = ocfs2_journal_toggle_dirty(journal->j_osb, 0, 0);
1123         if (status < 0)
1124                 mlog_errno(status);
1125 
1126 bail:
1127         return status;
1128 }
1129 
1130 static int ocfs2_recovery_completed(struct ocfs2_super *osb)
1131 {
1132         int empty;
1133         struct ocfs2_recovery_map *rm = osb->recovery_map;
1134 
1135         spin_lock(&osb->osb_lock);
1136         empty = (rm->rm_used == 0);
1137         spin_unlock(&osb->osb_lock);
1138 
1139         return empty;
1140 }
1141 
1142 void ocfs2_wait_for_recovery(struct ocfs2_super *osb)
1143 {
1144         wait_event(osb->recovery_event, ocfs2_recovery_completed(osb));
1145 }
1146 
1147 /*
1148  * JBD Might read a cached version of another nodes journal file. We
1149  * don't want this as this file changes often and we get no
1150  * notification on those changes. The only way to be sure that we've
1151  * got the most up to date version of those blocks then is to force
1152  * read them off disk. Just searching through the buffer cache won't
1153  * work as there may be pages backing this file which are still marked
1154  * up to date. We know things can't change on this file underneath us
1155  * as we have the lock by now :)
1156  */
1157 static int ocfs2_force_read_journal(struct inode *inode)
1158 {
1159         int status = 0;
1160         int i;
1161         u64 v_blkno, p_blkno, p_blocks, num_blocks;
1162 #define CONCURRENT_JOURNAL_FILL 32ULL
1163         struct buffer_head *bhs[CONCURRENT_JOURNAL_FILL];
1164 
1165         memset(bhs, 0, sizeof(struct buffer_head *) * CONCURRENT_JOURNAL_FILL);
1166 
1167         num_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
1168         v_blkno = 0;
1169         while (v_blkno < num_blocks) {
1170                 status = ocfs2_extent_map_get_blocks(inode, v_blkno,
1171                                                      &p_blkno, &p_blocks, NULL);
1172                 if (status < 0) {
1173                         mlog_errno(status);
1174                         goto bail;
1175                 }
1176 
1177                 if (p_blocks > CONCURRENT_JOURNAL_FILL)
1178                         p_blocks = CONCURRENT_JOURNAL_FILL;
1179 
1180                 /* We are reading journal data which should not
1181                  * be put in the uptodate cache */
1182                 status = ocfs2_read_blocks_sync(OCFS2_SB(inode->i_sb),
1183                                                 p_blkno, p_blocks, bhs);
1184                 if (status < 0) {
1185                         mlog_errno(status);
1186                         goto bail;
1187                 }
1188 
1189                 for(i = 0; i < p_blocks; i++) {
1190                         brelse(bhs[i]);
1191                         bhs[i] = NULL;
1192                 }
1193 
1194                 v_blkno += p_blocks;
1195         }
1196 
1197 bail:
1198         for(i = 0; i < CONCURRENT_JOURNAL_FILL; i++)
1199                 brelse(bhs[i]);
1200         return status;
1201 }
1202 
1203 struct ocfs2_la_recovery_item {
1204         struct list_head        lri_list;
1205         int                     lri_slot;
1206         struct ocfs2_dinode     *lri_la_dinode;
1207         struct ocfs2_dinode     *lri_tl_dinode;
1208         struct ocfs2_quota_recovery *lri_qrec;
1209         enum ocfs2_orphan_reco_type  lri_orphan_reco_type;
1210 };
1211 
1212 /* Does the second half of the recovery process. By this point, the
1213  * node is marked clean and can actually be considered recovered,
1214  * hence it's no longer in the recovery map, but there's still some
1215  * cleanup we can do which shouldn't happen within the recovery thread
1216  * as locking in that context becomes very difficult if we are to take
1217  * recovering nodes into account.
1218  *
1219  * NOTE: This function can and will sleep on recovery of other nodes
1220  * during cluster locking, just like any other ocfs2 process.
1221  */
1222 void ocfs2_complete_recovery(struct work_struct *work)
1223 {
1224         int ret = 0;
1225         struct ocfs2_journal *journal =
1226                 container_of(work, struct ocfs2_journal, j_recovery_work);
1227         struct ocfs2_super *osb = journal->j_osb;
1228         struct ocfs2_dinode *la_dinode, *tl_dinode;
1229         struct ocfs2_la_recovery_item *item, *n;
1230         struct ocfs2_quota_recovery *qrec;
1231         enum ocfs2_orphan_reco_type orphan_reco_type;
1232         LIST_HEAD(tmp_la_list);
1233 
1234         trace_ocfs2_complete_recovery(
1235                 (unsigned long long)OCFS2_I(journal->j_inode)->ip_blkno);
1236 
1237         spin_lock(&journal->j_lock);
1238         list_splice_init(&journal->j_la_cleanups, &tmp_la_list);
1239         spin_unlock(&journal->j_lock);
1240 
1241         list_for_each_entry_safe(item, n, &tmp_la_list, lri_list) {
1242                 list_del_init(&item->lri_list);
1243 
1244                 ocfs2_wait_on_quotas(osb);
1245 
1246                 la_dinode = item->lri_la_dinode;
1247                 tl_dinode = item->lri_tl_dinode;
1248                 qrec = item->lri_qrec;
1249                 orphan_reco_type = item->lri_orphan_reco_type;
1250 
1251                 trace_ocfs2_complete_recovery_slot(item->lri_slot,
1252                         la_dinode ? le64_to_cpu(la_dinode->i_blkno) : 0,
1253                         tl_dinode ? le64_to_cpu(tl_dinode->i_blkno) : 0,
1254                         qrec);
1255 
1256                 if (la_dinode) {
1257                         ret = ocfs2_complete_local_alloc_recovery(osb,
1258                                                                   la_dinode);
1259                         if (ret < 0)
1260                                 mlog_errno(ret);
1261 
1262                         kfree(la_dinode);
1263                 }
1264 
1265                 if (tl_dinode) {
1266                         ret = ocfs2_complete_truncate_log_recovery(osb,
1267                                                                    tl_dinode);
1268                         if (ret < 0)
1269                                 mlog_errno(ret);
1270 
1271                         kfree(tl_dinode);
1272                 }
1273 
1274                 ret = ocfs2_recover_orphans(osb, item->lri_slot,
1275                                 orphan_reco_type);
1276                 if (ret < 0)
1277                         mlog_errno(ret);
1278 
1279                 if (qrec) {
1280                         ret = ocfs2_finish_quota_recovery(osb, qrec,
1281                                                           item->lri_slot);
1282                         if (ret < 0)
1283                                 mlog_errno(ret);
1284                         /* Recovery info is already freed now */
1285                 }
1286 
1287                 kfree(item);
1288         }
1289 
1290         trace_ocfs2_complete_recovery_end(ret);
1291 }
1292 
1293 /* NOTE: This function always eats your references to la_dinode and
1294  * tl_dinode, either manually on error, or by passing them to
1295  * ocfs2_complete_recovery */
1296 static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
1297                                             int slot_num,
1298                                             struct ocfs2_dinode *la_dinode,
1299                                             struct ocfs2_dinode *tl_dinode,
1300                                             struct ocfs2_quota_recovery *qrec,
1301                                             enum ocfs2_orphan_reco_type orphan_reco_type)
1302 {
1303         struct ocfs2_la_recovery_item *item;
1304 
1305         item = kmalloc(sizeof(struct ocfs2_la_recovery_item), GFP_NOFS);
1306         if (!item) {
1307                 /* Though we wish to avoid it, we are in fact safe in
1308                  * skipping local alloc cleanup as fsck.ocfs2 is more
1309                  * than capable of reclaiming unused space. */
1310                 kfree(la_dinode);
1311                 kfree(tl_dinode);
1312 
1313                 if (qrec)
1314                         ocfs2_free_quota_recovery(qrec);
1315 
1316                 mlog_errno(-ENOMEM);
1317                 return;
1318         }
1319 
1320         INIT_LIST_HEAD(&item->lri_list);
1321         item->lri_la_dinode = la_dinode;
1322         item->lri_slot = slot_num;
1323         item->lri_tl_dinode = tl_dinode;
1324         item->lri_qrec = qrec;
1325         item->lri_orphan_reco_type = orphan_reco_type;
1326 
1327         spin_lock(&journal->j_lock);
1328         list_add_tail(&item->lri_list, &journal->j_la_cleanups);
1329         queue_work(journal->j_osb->ocfs2_wq, &journal->j_recovery_work);
1330         spin_unlock(&journal->j_lock);
1331 }
1332 
1333 /* Called by the mount code to queue recovery the last part of
1334  * recovery for it's own and offline slot(s). */
1335 void ocfs2_complete_mount_recovery(struct ocfs2_super *osb)
1336 {
1337         struct ocfs2_journal *journal = osb->journal;
1338 
1339         if (ocfs2_is_hard_readonly(osb))
1340                 return;
1341 
1342         /* No need to queue up our truncate_log as regular cleanup will catch
1343          * that */
1344         ocfs2_queue_recovery_completion(journal, osb->slot_num,
1345                                         osb->local_alloc_copy, NULL, NULL,
1346                                         ORPHAN_NEED_TRUNCATE);
1347         ocfs2_schedule_truncate_log_flush(osb, 0);
1348 
1349         osb->local_alloc_copy = NULL;
1350         osb->dirty = 0;
1351 
1352         /* queue to recover orphan slots for all offline slots */
1353         ocfs2_replay_map_set_state(osb, REPLAY_NEEDED);
1354         ocfs2_queue_replay_slots(osb, ORPHAN_NEED_TRUNCATE);
1355         ocfs2_free_replay_slots(osb);
1356 }
1357 
1358 void ocfs2_complete_quota_recovery(struct ocfs2_super *osb)
1359 {
1360         if (osb->quota_rec) {
1361                 ocfs2_queue_recovery_completion(osb->journal,
1362                                                 osb->slot_num,
1363                                                 NULL,
1364                                                 NULL,
1365                                                 osb->quota_rec,
1366                                                 ORPHAN_NEED_TRUNCATE);
1367                 osb->quota_rec = NULL;
1368         }
1369 }
1370 
1371 static int __ocfs2_recovery_thread(void *arg)
1372 {
1373         int status, node_num, slot_num;
1374         struct ocfs2_super *osb = arg;
1375         struct ocfs2_recovery_map *rm = osb->recovery_map;
1376         int *rm_quota = NULL;
1377         int rm_quota_used = 0, i;
1378         struct ocfs2_quota_recovery *qrec;
1379 
1380         status = ocfs2_wait_on_mount(osb);
1381         if (status < 0) {
1382                 goto bail;
1383         }
1384 
1385         rm_quota = kzalloc(osb->max_slots * sizeof(int), GFP_NOFS);
1386         if (!rm_quota) {
1387                 status = -ENOMEM;
1388                 goto bail;
1389         }
1390 restart:
1391         status = ocfs2_super_lock(osb, 1);
1392         if (status < 0) {
1393                 mlog_errno(status);
1394                 goto bail;
1395         }
1396 
1397         status = ocfs2_compute_replay_slots(osb);
1398         if (status < 0)
1399                 mlog_errno(status);
1400 
1401         /* queue recovery for our own slot */
1402         ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL,
1403                                         NULL, NULL, ORPHAN_NO_NEED_TRUNCATE);
1404 
1405         spin_lock(&osb->osb_lock);
1406         while (rm->rm_used) {
1407                 /* It's always safe to remove entry zero, as we won't
1408                  * clear it until ocfs2_recover_node() has succeeded. */
1409                 node_num = rm->rm_entries[0];
1410                 spin_unlock(&osb->osb_lock);
1411                 slot_num = ocfs2_node_num_to_slot(osb, node_num);
1412                 trace_ocfs2_recovery_thread_node(node_num, slot_num);
1413                 if (slot_num == -ENOENT) {
1414                         status = 0;
1415                         goto skip_recovery;
1416                 }
1417 
1418                 /* It is a bit subtle with quota recovery. We cannot do it
1419                  * immediately because we have to obtain cluster locks from
1420                  * quota files and we also don't want to just skip it because
1421                  * then quota usage would be out of sync until some node takes
1422                  * the slot. So we remember which nodes need quota recovery
1423                  * and when everything else is done, we recover quotas. */
1424                 for (i = 0; i < rm_quota_used && rm_quota[i] != slot_num; i++);
1425                 if (i == rm_quota_used)
1426                         rm_quota[rm_quota_used++] = slot_num;
1427 
1428                 status = ocfs2_recover_node(osb, node_num, slot_num);
1429 skip_recovery:
1430                 if (!status) {
1431                         ocfs2_recovery_map_clear(osb, node_num);
1432                 } else {
1433                         mlog(ML_ERROR,
1434                              "Error %d recovering node %d on device (%u,%u)!\n",
1435                              status, node_num,
1436                              MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1437                         mlog(ML_ERROR, "Volume requires unmount.\n");
1438                 }
1439 
1440                 spin_lock(&osb->osb_lock);
1441         }
1442         spin_unlock(&osb->osb_lock);
1443         trace_ocfs2_recovery_thread_end(status);
1444 
1445         /* Refresh all journal recovery generations from disk */
1446         status = ocfs2_check_journals_nolocks(osb);
1447         status = (status == -EROFS) ? 0 : status;
1448         if (status < 0)
1449                 mlog_errno(status);
1450 
1451         /* Now it is right time to recover quotas... We have to do this under
1452          * superblock lock so that no one can start using the slot (and crash)
1453          * before we recover it */
1454         for (i = 0; i < rm_quota_used; i++) {
1455                 qrec = ocfs2_begin_quota_recovery(osb, rm_quota[i]);
1456                 if (IS_ERR(qrec)) {
1457                         status = PTR_ERR(qrec);
1458                         mlog_errno(status);
1459                         continue;
1460                 }
1461                 ocfs2_queue_recovery_completion(osb->journal, rm_quota[i],
1462                                                 NULL, NULL, qrec,
1463                                                 ORPHAN_NEED_TRUNCATE);
1464         }
1465 
1466         ocfs2_super_unlock(osb, 1);
1467 
1468         /* queue recovery for offline slots */
1469         ocfs2_queue_replay_slots(osb, ORPHAN_NEED_TRUNCATE);
1470 
1471 bail:
1472         mutex_lock(&osb->recovery_lock);
1473         if (!status && !ocfs2_recovery_completed(osb)) {
1474                 mutex_unlock(&osb->recovery_lock);
1475                 goto restart;
1476         }
1477 
1478         ocfs2_free_replay_slots(osb);
1479         osb->recovery_thread_task = NULL;
1480         mb(); /* sync with ocfs2_recovery_thread_running */
1481         wake_up(&osb->recovery_event);
1482 
1483         mutex_unlock(&osb->recovery_lock);
1484 
1485         kfree(rm_quota);
1486 
1487         /* no one is callint kthread_stop() for us so the kthread() api
1488          * requires that we call do_exit().  And it isn't exported, but
1489          * complete_and_exit() seems to be a minimal wrapper around it. */
1490         complete_and_exit(NULL, status);
1491 }
1492 
1493 void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num)
1494 {
1495         mutex_lock(&osb->recovery_lock);
1496 
1497         trace_ocfs2_recovery_thread(node_num, osb->node_num,
1498                 osb->disable_recovery, osb->recovery_thread_task,
1499                 osb->disable_recovery ?
1500                 -1 : ocfs2_recovery_map_set(osb, node_num));
1501 
1502         if (osb->disable_recovery)
1503                 goto out;
1504 
1505         if (osb->recovery_thread_task)
1506                 goto out;
1507 
1508         osb->recovery_thread_task =  kthread_run(__ocfs2_recovery_thread, osb,
1509                         "ocfs2rec-%s", osb->uuid_str);
1510         if (IS_ERR(osb->recovery_thread_task)) {
1511                 mlog_errno((int)PTR_ERR(osb->recovery_thread_task));
1512                 osb->recovery_thread_task = NULL;
1513         }
1514 
1515 out:
1516         mutex_unlock(&osb->recovery_lock);
1517         wake_up(&osb->recovery_event);
1518 }
1519 
1520 static int ocfs2_read_journal_inode(struct ocfs2_super *osb,
1521                                     int slot_num,
1522                                     struct buffer_head **bh,
1523                                     struct inode **ret_inode)
1524 {
1525         int status = -EACCES;
1526         struct inode *inode = NULL;
1527 
1528         BUG_ON(slot_num >= osb->max_slots);
1529 
1530         inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
1531                                             slot_num);
1532         if (!inode || is_bad_inode(inode)) {
1533                 mlog_errno(status);
1534                 goto bail;
1535         }
1536         SET_INODE_JOURNAL(inode);
1537 
1538         status = ocfs2_read_inode_block_full(inode, bh, OCFS2_BH_IGNORE_CACHE);
1539         if (status < 0) {
1540                 mlog_errno(status);
1541                 goto bail;
1542         }
1543 
1544         status = 0;
1545 
1546 bail:
1547         if (inode) {
1548                 if (status || !ret_inode)
1549                         iput(inode);
1550                 else
1551                         *ret_inode = inode;
1552         }
1553         return status;
1554 }
1555 
1556 /* Does the actual journal replay and marks the journal inode as
1557  * clean. Will only replay if the journal inode is marked dirty. */
1558 static int ocfs2_replay_journal(struct ocfs2_super *osb,
1559                                 int node_num,
1560                                 int slot_num)
1561 {
1562         int status;
1563         int got_lock = 0;
1564         unsigned int flags;
1565         struct inode *inode = NULL;
1566         struct ocfs2_dinode *fe;
1567         journal_t *journal = NULL;
1568         struct buffer_head *bh = NULL;
1569         u32 slot_reco_gen;
1570 
1571         status = ocfs2_read_journal_inode(osb, slot_num, &bh, &inode);
1572         if (status) {
1573                 mlog_errno(status);
1574                 goto done;
1575         }
1576 
1577         fe = (struct ocfs2_dinode *)bh->b_data;
1578         slot_reco_gen = ocfs2_get_recovery_generation(fe);
1579         brelse(bh);
1580         bh = NULL;
1581 
1582         /*
1583          * As the fs recovery is asynchronous, there is a small chance that
1584          * another node mounted (and recovered) the slot before the recovery
1585          * thread could get the lock. To handle that, we dirty read the journal
1586          * inode for that slot to get the recovery generation. If it is
1587          * different than what we expected, the slot has been recovered.
1588          * If not, it needs recovery.
1589          */
1590         if (osb->slot_recovery_generations[slot_num] != slot_reco_gen) {
1591                 trace_ocfs2_replay_journal_recovered(slot_num,
1592                      osb->slot_recovery_generations[slot_num], slot_reco_gen);
1593                 osb->slot_recovery_generations[slot_num] = slot_reco_gen;
1594                 status = -EBUSY;
1595                 goto done;
1596         }
1597 
1598         /* Continue with recovery as the journal has not yet been recovered */
1599 
1600         status = ocfs2_inode_lock_full(inode, &bh, 1, OCFS2_META_LOCK_RECOVERY);
1601         if (status < 0) {
1602                 trace_ocfs2_replay_journal_lock_err(status);
1603                 if (status != -ERESTARTSYS)
1604                         mlog(ML_ERROR, "Could not lock journal!\n");
1605                 goto done;
1606         }
1607         got_lock = 1;
1608 
1609         fe = (struct ocfs2_dinode *) bh->b_data;
1610 
1611         flags = le32_to_cpu(fe->id1.journal1.ij_flags);
1612         slot_reco_gen = ocfs2_get_recovery_generation(fe);
1613 
1614         if (!(flags & OCFS2_JOURNAL_DIRTY_FL)) {
1615                 trace_ocfs2_replay_journal_skip(node_num);
1616                 /* Refresh recovery generation for the slot */
1617                 osb->slot_recovery_generations[slot_num] = slot_reco_gen;
1618                 goto done;
1619         }
1620 
1621         /* we need to run complete recovery for offline orphan slots */
1622         ocfs2_replay_map_set_state(osb, REPLAY_NEEDED);
1623 
1624         printk(KERN_NOTICE "ocfs2: Begin replay journal (node %d, slot %d) on "\
1625                "device (%u,%u)\n", node_num, slot_num, MAJOR(osb->sb->s_dev),
1626                MINOR(osb->sb->s_dev));
1627 
1628         OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
1629 
1630         status = ocfs2_force_read_journal(inode);
1631         if (status < 0) {
1632                 mlog_errno(status);
1633                 goto done;
1634         }
1635 
1636         journal = jbd2_journal_init_inode(inode);
1637         if (journal == NULL) {
1638                 mlog(ML_ERROR, "Linux journal layer error\n");
1639                 status = -EIO;
1640                 goto done;
1641         }
1642 
1643         status = jbd2_journal_load(journal);
1644         if (status < 0) {
1645                 mlog_errno(status);
1646                 if (!igrab(inode))
1647                         BUG();
1648                 jbd2_journal_destroy(journal);
1649                 goto done;
1650         }
1651 
1652         ocfs2_clear_journal_error(osb->sb, journal, slot_num);
1653 
1654         /* wipe the journal */
1655         jbd2_journal_lock_updates(journal);
1656         status = jbd2_journal_flush(journal);
1657         jbd2_journal_unlock_updates(journal);
1658         if (status < 0)
1659                 mlog_errno(status);
1660 
1661         /* This will mark the node clean */
1662         flags = le32_to_cpu(fe->id1.journal1.ij_flags);
1663         flags &= ~OCFS2_JOURNAL_DIRTY_FL;
1664         fe->id1.journal1.ij_flags = cpu_to_le32(flags);
1665 
1666         /* Increment recovery generation to indicate successful recovery */
1667         ocfs2_bump_recovery_generation(fe);
1668         osb->slot_recovery_generations[slot_num] =
1669                                         ocfs2_get_recovery_generation(fe);
1670 
1671         ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &fe->i_check);
1672         status = ocfs2_write_block(osb, bh, INODE_CACHE(inode));
1673         if (status < 0)
1674                 mlog_errno(status);
1675 
1676         if (!igrab(inode))
1677                 BUG();
1678 
1679         jbd2_journal_destroy(journal);
1680 
1681         printk(KERN_NOTICE "ocfs2: End replay journal (node %d, slot %d) on "\
1682                "device (%u,%u)\n", node_num, slot_num, MAJOR(osb->sb->s_dev),
1683                MINOR(osb->sb->s_dev));
1684 done:
1685         /* drop the lock on this nodes journal */
1686         if (got_lock)
1687                 ocfs2_inode_unlock(inode, 1);
1688 
1689         iput(inode);
1690         brelse(bh);
1691 
1692         return status;
1693 }
1694 
1695 /*
1696  * Do the most important parts of node recovery:
1697  *  - Replay it's journal
1698  *  - Stamp a clean local allocator file
1699  *  - Stamp a clean truncate log
1700  *  - Mark the node clean
1701  *
1702  * If this function completes without error, a node in OCFS2 can be
1703  * said to have been safely recovered. As a result, failure during the
1704  * second part of a nodes recovery process (local alloc recovery) is
1705  * far less concerning.
1706  */
1707 static int ocfs2_recover_node(struct ocfs2_super *osb,
1708                               int node_num, int slot_num)
1709 {
1710         int status = 0;
1711         struct ocfs2_dinode *la_copy = NULL;
1712         struct ocfs2_dinode *tl_copy = NULL;
1713 
1714         trace_ocfs2_recover_node(node_num, slot_num, osb->node_num);
1715 
1716         /* Should not ever be called to recover ourselves -- in that
1717          * case we should've called ocfs2_journal_load instead. */
1718         BUG_ON(osb->node_num == node_num);
1719 
1720         status = ocfs2_replay_journal(osb, node_num, slot_num);
1721         if (status < 0) {
1722                 if (status == -EBUSY) {
1723                         trace_ocfs2_recover_node_skip(slot_num, node_num);
1724                         status = 0;
1725                         goto done;
1726                 }
1727                 mlog_errno(status);
1728                 goto done;
1729         }
1730 
1731         /* Stamp a clean local alloc file AFTER recovering the journal... */
1732         status = ocfs2_begin_local_alloc_recovery(osb, slot_num, &la_copy);
1733         if (status < 0) {
1734                 mlog_errno(status);
1735                 goto done;
1736         }
1737 
1738         /* An error from begin_truncate_log_recovery is not
1739          * serious enough to warrant halting the rest of
1740          * recovery. */
1741         status = ocfs2_begin_truncate_log_recovery(osb, slot_num, &tl_copy);
1742         if (status < 0)
1743                 mlog_errno(status);
1744 
1745         /* Likewise, this would be a strange but ultimately not so
1746          * harmful place to get an error... */
1747         status = ocfs2_clear_slot(osb, slot_num);
1748         if (status < 0)
1749                 mlog_errno(status);
1750 
1751         /* This will kfree the memory pointed to by la_copy and tl_copy */
1752         ocfs2_queue_recovery_completion(osb->journal, slot_num, la_copy,
1753                                         tl_copy, NULL, ORPHAN_NEED_TRUNCATE);
1754 
1755         status = 0;
1756 done:
1757 
1758         return status;
1759 }
1760 
1761 /* Test node liveness by trylocking his journal. If we get the lock,
1762  * we drop it here. Return 0 if we got the lock, -EAGAIN if node is
1763  * still alive (we couldn't get the lock) and < 0 on error. */
1764 static int ocfs2_trylock_journal(struct ocfs2_super *osb,
1765                                  int slot_num)
1766 {
1767         int status, flags;
1768         struct inode *inode = NULL;
1769 
1770         inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
1771                                             slot_num);
1772         if (inode == NULL) {
1773                 mlog(ML_ERROR, "access error\n");
1774                 status = -EACCES;
1775                 goto bail;
1776         }
1777         if (is_bad_inode(inode)) {
1778                 mlog(ML_ERROR, "access error (bad inode)\n");
1779                 iput(inode);
1780                 inode = NULL;
1781                 status = -EACCES;
1782                 goto bail;
1783         }
1784         SET_INODE_JOURNAL(inode);
1785 
1786         flags = OCFS2_META_LOCK_RECOVERY | OCFS2_META_LOCK_NOQUEUE;
1787         status = ocfs2_inode_lock_full(inode, NULL, 1, flags);
1788         if (status < 0) {
1789                 if (status != -EAGAIN)
1790                         mlog_errno(status);
1791                 goto bail;
1792         }
1793 
1794         ocfs2_inode_unlock(inode, 1);
1795 bail:
1796         iput(inode);
1797 
1798         return status;
1799 }
1800 
1801 /* Call this underneath ocfs2_super_lock. It also assumes that the
1802  * slot info struct has been updated from disk. */
1803 int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
1804 {
1805         unsigned int node_num;
1806         int status, i;
1807         u32 gen;
1808         struct buffer_head *bh = NULL;
1809         struct ocfs2_dinode *di;
1810 
1811         /* This is called with the super block cluster lock, so we
1812          * know that the slot map can't change underneath us. */
1813 
1814         for (i = 0; i < osb->max_slots; i++) {
1815                 /* Read journal inode to get the recovery generation */
1816                 status = ocfs2_read_journal_inode(osb, i, &bh, NULL);
1817                 if (status) {
1818                         mlog_errno(status);
1819                         goto bail;
1820                 }
1821                 di = (struct ocfs2_dinode *)bh->b_data;
1822                 gen = ocfs2_get_recovery_generation(di);
1823                 brelse(bh);
1824                 bh = NULL;
1825 
1826                 spin_lock(&osb->osb_lock);
1827                 osb->slot_recovery_generations[i] = gen;
1828 
1829                 trace_ocfs2_mark_dead_nodes(i,
1830                                             osb->slot_recovery_generations[i]);
1831 
1832                 if (i == osb->slot_num) {
1833                         spin_unlock(&osb->osb_lock);
1834                         continue;
1835                 }
1836 
1837                 status = ocfs2_slot_to_node_num_locked(osb, i, &node_num);
1838                 if (status == -ENOENT) {
1839                         spin_unlock(&osb->osb_lock);
1840                         continue;
1841                 }
1842 
1843                 if (__ocfs2_recovery_map_test(osb, node_num)) {
1844                         spin_unlock(&osb->osb_lock);
1845                         continue;
1846                 }
1847                 spin_unlock(&osb->osb_lock);
1848 
1849                 /* Ok, we have a slot occupied by another node which
1850                  * is not in the recovery map. We trylock his journal
1851                  * file here to test if he's alive. */
1852                 status = ocfs2_trylock_journal(osb, i);
1853                 if (!status) {
1854                         /* Since we're called from mount, we know that
1855                          * the recovery thread can't race us on
1856                          * setting / checking the recovery bits. */
1857                         ocfs2_recovery_thread(osb, node_num);
1858                 } else if ((status < 0) && (status != -EAGAIN)) {
1859                         mlog_errno(status);
1860                         goto bail;
1861                 }
1862         }
1863 
1864         status = 0;
1865 bail:
1866         return status;
1867 }
1868 
1869 /*
1870  * Scan timer should get fired every ORPHAN_SCAN_SCHEDULE_TIMEOUT. Add some
1871  * randomness to the timeout to minimize multple nodes firing the timer at the
1872  * same time.
1873  */
1874 static inline unsigned long ocfs2_orphan_scan_timeout(void)
1875 {
1876         unsigned long time;
1877 
1878         get_random_bytes(&time, sizeof(time));
1879         time = ORPHAN_SCAN_SCHEDULE_TIMEOUT + (time % 5000);
1880         return msecs_to_jiffies(time);
1881 }
1882 
1883 /*
1884  * ocfs2_queue_orphan_scan calls ocfs2_queue_recovery_completion for
1885  * every slot, queuing a recovery of the slot on the ocfs2_wq thread. This
1886  * is done to catch any orphans that are left over in orphan directories.
1887  *
1888  * It scans all slots, even ones that are in use. It does so to handle the
1889  * case described below:
1890  *
1891  *   Node 1 has an inode it was using. The dentry went away due to memory
1892  *   pressure.  Node 1 closes the inode, but it's on the free list. The node
1893  *   has the open lock.
1894  *   Node 2 unlinks the inode. It grabs the dentry lock to notify others,
1895  *   but node 1 has no dentry and doesn't get the message. It trylocks the
1896  *   open lock, sees that another node has a PR, and does nothing.
1897  *   Later node 2 runs its orphan dir. It igets the inode, trylocks the
1898  *   open lock, sees the PR still, and does nothing.
1899  *   Basically, we have to trigger an orphan iput on node 1. The only way
1900  *   for this to happen is if node 1 runs node 2's orphan dir.
1901  *
1902  * ocfs2_queue_orphan_scan gets called every ORPHAN_SCAN_SCHEDULE_TIMEOUT
1903  * seconds.  It gets an EX lock on os_lockres and checks sequence number
1904  * stored in LVB. If the sequence number has changed, it means some other
1905  * node has done the scan.  This node skips the scan and tracks the
1906  * sequence number.  If the sequence number didn't change, it means a scan
1907  * hasn't happened.  The node queues a scan and increments the
1908  * sequence number in the LVB.
1909  */
1910 static void ocfs2_queue_orphan_scan(struct ocfs2_super *osb)
1911 {
1912         struct ocfs2_orphan_scan *os;
1913         int status, i;
1914         u32 seqno = 0;
1915 
1916         os = &osb->osb_orphan_scan;
1917 
1918         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
1919                 goto out;
1920 
1921         trace_ocfs2_queue_orphan_scan_begin(os->os_count, os->os_seqno,
1922                                             atomic_read(&os->os_state));
1923 
1924         status = ocfs2_orphan_scan_lock(osb, &seqno);
1925         if (status < 0) {
1926                 if (status != -EAGAIN)
1927                         mlog_errno(status);
1928                 goto out;
1929         }
1930 
1931         /* Do no queue the tasks if the volume is being umounted */
1932         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
1933                 goto unlock;
1934 
1935         if (os->os_seqno != seqno) {
1936                 os->os_seqno = seqno;
1937                 goto unlock;
1938         }
1939 
1940         for (i = 0; i < osb->max_slots; i++)
1941                 ocfs2_queue_recovery_completion(osb->journal, i, NULL, NULL,
1942                                                 NULL, ORPHAN_NO_NEED_TRUNCATE);
1943         /*
1944          * We queued a recovery on orphan slots, increment the sequence
1945          * number and update LVB so other node will skip the scan for a while
1946          */
1947         seqno++;
1948         os->os_count++;
1949         os->os_scantime = CURRENT_TIME;
1950 unlock:
1951         ocfs2_orphan_scan_unlock(osb, seqno);
1952 out:
1953         trace_ocfs2_queue_orphan_scan_end(os->os_count, os->os_seqno,
1954                                           atomic_read(&os->os_state));
1955         return;
1956 }
1957 
1958 /* Worker task that gets fired every ORPHAN_SCAN_SCHEDULE_TIMEOUT millsec */
1959 static void ocfs2_orphan_scan_work(struct work_struct *work)
1960 {
1961         struct ocfs2_orphan_scan *os;
1962         struct ocfs2_super *osb;
1963 
1964         os = container_of(work, struct ocfs2_orphan_scan,
1965                           os_orphan_scan_work.work);
1966         osb = os->os_osb;
1967 
1968         mutex_lock(&os->os_lock);
1969         ocfs2_queue_orphan_scan(osb);
1970         if (atomic_read(&os->os_state) == ORPHAN_SCAN_ACTIVE)
1971                 queue_delayed_work(osb->ocfs2_wq, &os->os_orphan_scan_work,
1972                                       ocfs2_orphan_scan_timeout());
1973         mutex_unlock(&os->os_lock);
1974 }
1975 
1976 void ocfs2_orphan_scan_stop(struct ocfs2_super *osb)
1977 {
1978         struct ocfs2_orphan_scan *os;
1979 
1980         os = &osb->osb_orphan_scan;
1981         if (atomic_read(&os->os_state) == ORPHAN_SCAN_ACTIVE) {
1982                 atomic_set(&os->os_state, ORPHAN_SCAN_INACTIVE);
1983                 mutex_lock(&os->os_lock);
1984                 cancel_delayed_work(&os->os_orphan_scan_work);
1985                 mutex_unlock(&os->os_lock);
1986         }
1987 }
1988 
1989 void ocfs2_orphan_scan_init(struct ocfs2_super *osb)
1990 {
1991         struct ocfs2_orphan_scan *os;
1992 
1993         os = &osb->osb_orphan_scan;
1994         os->os_osb = osb;
1995         os->os_count = 0;
1996         os->os_seqno = 0;
1997         mutex_init(&os->os_lock);
1998         INIT_DELAYED_WORK(&os->os_orphan_scan_work, ocfs2_orphan_scan_work);
1999 }
2000 
2001 void ocfs2_orphan_scan_start(struct ocfs2_super *osb)
2002 {
2003         struct ocfs2_orphan_scan *os;
2004 
2005         os = &osb->osb_orphan_scan;
2006         os->os_scantime = CURRENT_TIME;
2007         if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb))
2008                 atomic_set(&os->os_state, ORPHAN_SCAN_INACTIVE);
2009         else {
2010                 atomic_set(&os->os_state, ORPHAN_SCAN_ACTIVE);
2011                 queue_delayed_work(osb->ocfs2_wq, &os->os_orphan_scan_work,
2012                                    ocfs2_orphan_scan_timeout());
2013         }
2014 }
2015 
2016 struct ocfs2_orphan_filldir_priv {
2017         struct dir_context      ctx;
2018         struct inode            *head;
2019         struct ocfs2_super      *osb;
2020         enum ocfs2_orphan_reco_type orphan_reco_type;
2021 };
2022 
2023 static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
2024                                 int name_len, loff_t pos, u64 ino,
2025                                 unsigned type)
2026 {
2027         struct ocfs2_orphan_filldir_priv *p =
2028                 container_of(ctx, struct ocfs2_orphan_filldir_priv, ctx);
2029         struct inode *iter;
2030 
2031         if (name_len == 1 && !strncmp(".", name, 1))
2032                 return 0;
2033         if (name_len == 2 && !strncmp("..", name, 2))
2034                 return 0;
2035 
2036         /* do not include dio entry in case of orphan scan */
2037         if ((p->orphan_reco_type == ORPHAN_NO_NEED_TRUNCATE) &&
2038                         (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
2039                         OCFS2_DIO_ORPHAN_PREFIX_LEN)))
2040                 return 0;
2041 
2042         /* Skip bad inodes so that recovery can continue */
2043         iter = ocfs2_iget(p->osb, ino,
2044                           OCFS2_FI_FLAG_ORPHAN_RECOVERY, 0);
2045         if (IS_ERR(iter))
2046                 return 0;
2047 
2048         if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
2049                         OCFS2_DIO_ORPHAN_PREFIX_LEN))
2050                 OCFS2_I(iter)->ip_flags |= OCFS2_INODE_DIO_ORPHAN_ENTRY;
2051 
2052         /* Skip inodes which are already added to recover list, since dio may
2053          * happen concurrently with unlink/rename */
2054         if (OCFS2_I(iter)->ip_next_orphan) {
2055                 iput(iter);
2056                 return 0;
2057         }
2058 
2059         trace_ocfs2_orphan_filldir((unsigned long long)OCFS2_I(iter)->ip_blkno);
2060         /* No locking is required for the next_orphan queue as there
2061          * is only ever a single process doing orphan recovery. */
2062         OCFS2_I(iter)->ip_next_orphan = p->head;
2063         p->head = iter;
2064 
2065         return 0;
2066 }
2067 
2068 static int ocfs2_queue_orphans(struct ocfs2_super *osb,
2069                                int slot,
2070                                struct inode **head,
2071                                enum ocfs2_orphan_reco_type orphan_reco_type)
2072 {
2073         int status;
2074         struct inode *orphan_dir_inode = NULL;
2075         struct ocfs2_orphan_filldir_priv priv = {
2076                 .ctx.actor = ocfs2_orphan_filldir,
2077                 .osb = osb,
2078                 .head = *head,
2079                 .orphan_reco_type = orphan_reco_type
2080         };
2081 
2082         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2083                                                        ORPHAN_DIR_SYSTEM_INODE,
2084                                                        slot);
2085         if  (!orphan_dir_inode) {
2086                 status = -ENOENT;
2087                 mlog_errno(status);
2088                 return status;
2089         }
2090 
2091         inode_lock(orphan_dir_inode);
2092         status = ocfs2_inode_lock(orphan_dir_inode, NULL, 0);
2093         if (status < 0) {
2094                 mlog_errno(status);
2095                 goto out;
2096         }
2097 
2098         status = ocfs2_dir_foreach(orphan_dir_inode, &priv.ctx);
2099         if (status) {
2100                 mlog_errno(status);
2101                 goto out_cluster;
2102         }
2103 
2104         *head = priv.head;
2105 
2106 out_cluster:
2107         ocfs2_inode_unlock(orphan_dir_inode, 0);
2108 out:
2109         inode_unlock(orphan_dir_inode);
2110         iput(orphan_dir_inode);
2111         return status;
2112 }
2113 
2114 static int ocfs2_orphan_recovery_can_continue(struct ocfs2_super *osb,
2115                                               int slot)
2116 {
2117         int ret;
2118 
2119         spin_lock(&osb->osb_lock);
2120         ret = !osb->osb_orphan_wipes[slot];
2121         spin_unlock(&osb->osb_lock);
2122         return ret;
2123 }
2124 
2125 static void ocfs2_mark_recovering_orphan_dir(struct ocfs2_super *osb,
2126                                              int slot)
2127 {
2128         spin_lock(&osb->osb_lock);
2129         /* Mark ourselves such that new processes in delete_inode()
2130          * know to quit early. */
2131         ocfs2_node_map_set_bit(osb, &osb->osb_recovering_orphan_dirs, slot);
2132         while (osb->osb_orphan_wipes[slot]) {
2133                 /* If any processes are already in the middle of an
2134                  * orphan wipe on this dir, then we need to wait for
2135                  * them. */
2136                 spin_unlock(&osb->osb_lock);
2137                 wait_event_interruptible(osb->osb_wipe_event,
2138                                          ocfs2_orphan_recovery_can_continue(osb, slot));
2139                 spin_lock(&osb->osb_lock);
2140         }
2141         spin_unlock(&osb->osb_lock);
2142 }
2143 
2144 static void ocfs2_clear_recovering_orphan_dir(struct ocfs2_super *osb,
2145                                               int slot)
2146 {
2147         ocfs2_node_map_clear_bit(osb, &osb->osb_recovering_orphan_dirs, slot);
2148 }
2149 
2150 /*
2151  * Orphan recovery. Each mounted node has it's own orphan dir which we
2152  * must run during recovery. Our strategy here is to build a list of
2153  * the inodes in the orphan dir and iget/iput them. The VFS does
2154  * (most) of the rest of the work.
2155  *
2156  * Orphan recovery can happen at any time, not just mount so we have a
2157  * couple of extra considerations.
2158  *
2159  * - We grab as many inodes as we can under the orphan dir lock -
2160  *   doing iget() outside the orphan dir risks getting a reference on
2161  *   an invalid inode.
2162  * - We must be sure not to deadlock with other processes on the
2163  *   system wanting to run delete_inode(). This can happen when they go
2164  *   to lock the orphan dir and the orphan recovery process attempts to
2165  *   iget() inside the orphan dir lock. This can be avoided by
2166  *   advertising our state to ocfs2_delete_inode().
2167  */
2168 static int ocfs2_recover_orphans(struct ocfs2_super *osb,
2169                                  int slot,
2170                                  enum ocfs2_orphan_reco_type orphan_reco_type)
2171 {
2172         int ret = 0;
2173         struct inode *inode = NULL;
2174         struct inode *iter;
2175         struct ocfs2_inode_info *oi;
2176         struct buffer_head *di_bh = NULL;
2177         struct ocfs2_dinode *di = NULL;
2178 
2179         trace_ocfs2_recover_orphans(slot);
2180 
2181         ocfs2_mark_recovering_orphan_dir(osb, slot);
2182         ret = ocfs2_queue_orphans(osb, slot, &inode, orphan_reco_type);
2183         ocfs2_clear_recovering_orphan_dir(osb, slot);
2184 
2185         /* Error here should be noted, but we want to continue with as
2186          * many queued inodes as we've got. */
2187         if (ret)
2188                 mlog_errno(ret);
2189 
2190         while (inode) {
2191                 oi = OCFS2_I(inode);
2192                 trace_ocfs2_recover_orphans_iput(
2193                                         (unsigned long long)oi->ip_blkno);
2194 
2195                 iter = oi->ip_next_orphan;
2196                 oi->ip_next_orphan = NULL;
2197 
2198                 if (oi->ip_flags & OCFS2_INODE_DIO_ORPHAN_ENTRY) {
2199                         inode_lock(inode);
2200                         ret = ocfs2_rw_lock(inode, 1);
2201                         if (ret < 0) {
2202                                 mlog_errno(ret);
2203                                 goto unlock_mutex;
2204                         }
2205                         /*
2206                          * We need to take and drop the inode lock to
2207                          * force read inode from disk.
2208                          */
2209                         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2210                         if (ret) {
2211                                 mlog_errno(ret);
2212                                 goto unlock_rw;
2213                         }
2214 
2215                         di = (struct ocfs2_dinode *)di_bh->b_data;
2216 
2217                         if (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) {
2218                                 ret = ocfs2_truncate_file(inode, di_bh,
2219                                                 i_size_read(inode));
2220                                 if (ret < 0) {
2221                                         if (ret != -ENOSPC)
2222                                                 mlog_errno(ret);
2223                                         goto unlock_inode;
2224                                 }
2225 
2226                                 ret = ocfs2_del_inode_from_orphan(osb, inode,
2227                                                 di_bh, 0, 0);
2228                                 if (ret)
2229                                         mlog_errno(ret);
2230                         }
2231 unlock_inode:
2232                         ocfs2_inode_unlock(inode, 1);
2233                         brelse(di_bh);
2234                         di_bh = NULL;
2235 unlock_rw:
2236                         ocfs2_rw_unlock(inode, 1);
2237 unlock_mutex:
2238                         inode_unlock(inode);
2239 
2240                         /* clear dio flag in ocfs2_inode_info */
2241                         oi->ip_flags &= ~OCFS2_INODE_DIO_ORPHAN_ENTRY;
2242                 } else {
2243                         spin_lock(&oi->ip_lock);
2244                         /* Set the proper information to get us going into
2245                          * ocfs2_delete_inode. */
2246                         oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
2247                         spin_unlock(&oi->ip_lock);
2248                 }
2249 
2250                 iput(inode);
2251                 inode = iter;
2252         }
2253 
2254         return ret;
2255 }
2256 
2257 static int __ocfs2_wait_on_mount(struct ocfs2_super *osb, int quota)
2258 {
2259         /* This check is good because ocfs2 will wait on our recovery
2260          * thread before changing it to something other than MOUNTED
2261          * or DISABLED. */
2262         wait_event(osb->osb_mount_event,
2263                   (!quota && atomic_read(&osb->vol_state) == VOLUME_MOUNTED) ||
2264                    atomic_read(&osb->vol_state) == VOLUME_MOUNTED_QUOTAS ||
2265                    atomic_read(&osb->vol_state) == VOLUME_DISABLED);
2266 
2267         /* If there's an error on mount, then we may never get to the
2268          * MOUNTED flag, but this is set right before
2269          * dismount_volume() so we can trust it. */
2270         if (atomic_read(&osb->vol_state) == VOLUME_DISABLED) {
2271                 trace_ocfs2_wait_on_mount(VOLUME_DISABLED);
2272                 mlog(0, "mount error, exiting!\n");
2273                 return -EBUSY;
2274         }
2275 
2276         return 0;
2277 }
2278 
2279 static int ocfs2_commit_thread(void *arg)
2280 {
2281         int status;
2282         struct ocfs2_super *osb = arg;
2283         struct ocfs2_journal *journal = osb->journal;
2284 
2285         /* we can trust j_num_trans here because _should_stop() is only set in
2286          * shutdown and nobody other than ourselves should be able to start
2287          * transactions.  committing on shutdown might take a few iterations
2288          * as final transactions put deleted inodes on the list */
2289         while (!(kthread_should_stop() &&
2290                  atomic_read(&journal->j_num_trans) == 0)) {
2291 
2292                 wait_event_interruptible(osb->checkpoint_event,
2293                                          atomic_read(&journal->j_num_trans)
2294                                          || kthread_should_stop());
2295 
2296                 status = ocfs2_commit_cache(osb);
2297                 if (status < 0) {
2298                         static unsigned long abort_warn_time;
2299 
2300                         /* Warn about this once per minute */
2301                         if (printk_timed_ratelimit(&abort_warn_time, 60*HZ))
2302                                 mlog(ML_ERROR, "status = %d, journal is "
2303                                                 "already aborted.\n", status);
2304                         /*
2305                          * After ocfs2_commit_cache() fails, j_num_trans has a
2306                          * non-zero value.  Sleep here to avoid a busy-wait
2307                          * loop.
2308                          */
2309                         msleep_interruptible(1000);
2310                 }
2311 
2312                 if (kthread_should_stop() && atomic_read(&journal->j_num_trans)){
2313                         mlog(ML_KTHREAD,
2314                              "commit_thread: %u transactions pending on "
2315                              "shutdown\n",
2316                              atomic_read(&journal->j_num_trans));
2317                 }
2318         }
2319 
2320         return 0;
2321 }
2322 
2323 /* Reads all the journal inodes without taking any cluster locks. Used
2324  * for hard readonly access to determine whether any journal requires
2325  * recovery. Also used to refresh the recovery generation numbers after
2326  * a journal has been recovered by another node.
2327  */
2328 int ocfs2_check_journals_nolocks(struct ocfs2_super *osb)
2329 {
2330         int ret = 0;
2331         unsigned int slot;
2332         struct buffer_head *di_bh = NULL;
2333         struct ocfs2_dinode *di;
2334         int journal_dirty = 0;
2335 
2336         for(slot = 0; slot < osb->max_slots; slot++) {
2337                 ret = ocfs2_read_journal_inode(osb, slot, &di_bh, NULL);
2338                 if (ret) {
2339                         mlog_errno(ret);
2340                         goto out;
2341                 }
2342 
2343                 di = (struct ocfs2_dinode *) di_bh->b_data;
2344 
2345                 osb->slot_recovery_generations[slot] =
2346                                         ocfs2_get_recovery_generation(di);
2347 
2348                 if (le32_to_cpu(di->id1.journal1.ij_flags) &
2349                     OCFS2_JOURNAL_DIRTY_FL)
2350                         journal_dirty = 1;
2351 
2352                 brelse(di_bh);
2353                 di_bh = NULL;
2354         }
2355 
2356 out:
2357         if (journal_dirty)
2358                 ret = -EROFS;
2359         return ret;
2360 }
2361 

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