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

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  1 /*
  2 ** Write ahead logging implementation copyright Chris Mason 2000
  3 **
  4 ** The background commits make this code very interrelated, and
  5 ** overly complex.  I need to rethink things a bit....The major players:
  6 **
  7 ** journal_begin -- call with the number of blocks you expect to log.
  8 **                  If the current transaction is too
  9 **                  old, it will block until the current transaction is
 10 **                  finished, and then start a new one.
 11 **                  Usually, your transaction will get joined in with
 12 **                  previous ones for speed.
 13 **
 14 ** journal_join  -- same as journal_begin, but won't block on the current
 15 **                  transaction regardless of age.  Don't ever call
 16 **                  this.  Ever.  There are only two places it should be
 17 **                  called from, and they are both inside this file.
 18 **
 19 ** journal_mark_dirty -- adds blocks into this transaction.  clears any flags
 20 **                       that might make them get sent to disk
 21 **                       and then marks them BH_JDirty.  Puts the buffer head
 22 **                       into the current transaction hash.
 23 **
 24 ** journal_end -- if the current transaction is batchable, it does nothing
 25 **                   otherwise, it could do an async/synchronous commit, or
 26 **                   a full flush of all log and real blocks in the
 27 **                   transaction.
 28 **
 29 ** flush_old_commits -- if the current transaction is too old, it is ended and
 30 **                      commit blocks are sent to disk.  Forces commit blocks
 31 **                      to disk for all backgrounded commits that have been
 32 **                      around too long.
 33 **                   -- Note, if you call this as an immediate flush from
 34 **                      from within kupdate, it will ignore the immediate flag
 35 */
 36 
 37 #include <linux/time.h>
 38 #include <linux/semaphore.h>
 39 #include <linux/vmalloc.h>
 40 #include "reiserfs.h"
 41 #include <linux/kernel.h>
 42 #include <linux/errno.h>
 43 #include <linux/fcntl.h>
 44 #include <linux/stat.h>
 45 #include <linux/string.h>
 46 #include <linux/buffer_head.h>
 47 #include <linux/workqueue.h>
 48 #include <linux/writeback.h>
 49 #include <linux/blkdev.h>
 50 #include <linux/backing-dev.h>
 51 #include <linux/uaccess.h>
 52 #include <linux/slab.h>
 53 
 54 
 55 /* gets a struct reiserfs_journal_list * from a list head */
 56 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
 57                                j_list))
 58 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
 59                                j_working_list))
 60 
 61 /* the number of mounted filesystems.  This is used to decide when to
 62 ** start and kill the commit workqueue
 63 */
 64 static int reiserfs_mounted_fs_count;
 65 
 66 static struct workqueue_struct *commit_wq;
 67 
 68 #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
 69                                    structs at 4k */
 70 #define BUFNR 64                /*read ahead */
 71 
 72 /* cnode stat bits.  Move these into reiserfs_fs.h */
 73 
 74 #define BLOCK_FREED 2           /* this block was freed, and can't be written.  */
 75 #define BLOCK_FREED_HOLDER 3    /* this block was freed during this transaction, and can't be written */
 76 
 77 #define BLOCK_NEEDS_FLUSH 4     /* used in flush_journal_list */
 78 #define BLOCK_DIRTIED 5
 79 
 80 /* journal list state bits */
 81 #define LIST_TOUCHED 1
 82 #define LIST_DIRTY   2
 83 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
 84 
 85 /* flags for do_journal_end */
 86 #define FLUSH_ALL   1           /* flush commit and real blocks */
 87 #define COMMIT_NOW  2           /* end and commit this transaction */
 88 #define WAIT        4           /* wait for the log blocks to hit the disk */
 89 
 90 static int do_journal_end(struct reiserfs_transaction_handle *,
 91                           struct super_block *, unsigned long nblocks,
 92                           int flags);
 93 static int flush_journal_list(struct super_block *s,
 94                               struct reiserfs_journal_list *jl, int flushall);
 95 static int flush_commit_list(struct super_block *s,
 96                              struct reiserfs_journal_list *jl, int flushall);
 97 static int can_dirty(struct reiserfs_journal_cnode *cn);
 98 static int journal_join(struct reiserfs_transaction_handle *th,
 99                         struct super_block *sb, unsigned long nblocks);
100 static int release_journal_dev(struct super_block *super,
101                                struct reiserfs_journal *journal);
102 static int dirty_one_transaction(struct super_block *s,
103                                  struct reiserfs_journal_list *jl);
104 static void flush_async_commits(struct work_struct *work);
105 static void queue_log_writer(struct super_block *s);
106 
107 /* values for join in do_journal_begin_r */
108 enum {
109         JBEGIN_REG = 0,         /* regular journal begin */
110         JBEGIN_JOIN = 1,        /* join the running transaction if at all possible */
111         JBEGIN_ABORT = 2,       /* called from cleanup code, ignores aborted flag */
112 };
113 
114 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
115                               struct super_block *sb,
116                               unsigned long nblocks, int join);
117 
118 static void init_journal_hash(struct super_block *sb)
119 {
120         struct reiserfs_journal *journal = SB_JOURNAL(sb);
121         memset(journal->j_hash_table, 0,
122                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
123 }
124 
125 /*
126 ** clears BH_Dirty and sticks the buffer on the clean list.  Called because I can't allow refile_buffer to
127 ** make schedule happen after I've freed a block.  Look at remove_from_transaction and journal_mark_freed for
128 ** more details.
129 */
130 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
131 {
132         if (bh) {
133                 clear_buffer_dirty(bh);
134                 clear_buffer_journal_test(bh);
135         }
136         return 0;
137 }
138 
139 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
140                                                          *sb)
141 {
142         struct reiserfs_bitmap_node *bn;
143         static int id;
144 
145         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
146         if (!bn) {
147                 return NULL;
148         }
149         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
150         if (!bn->data) {
151                 kfree(bn);
152                 return NULL;
153         }
154         bn->id = id++;
155         INIT_LIST_HEAD(&bn->list);
156         return bn;
157 }
158 
159 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
160 {
161         struct reiserfs_journal *journal = SB_JOURNAL(sb);
162         struct reiserfs_bitmap_node *bn = NULL;
163         struct list_head *entry = journal->j_bitmap_nodes.next;
164 
165         journal->j_used_bitmap_nodes++;
166       repeat:
167 
168         if (entry != &journal->j_bitmap_nodes) {
169                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
170                 list_del(entry);
171                 memset(bn->data, 0, sb->s_blocksize);
172                 journal->j_free_bitmap_nodes--;
173                 return bn;
174         }
175         bn = allocate_bitmap_node(sb);
176         if (!bn) {
177                 yield();
178                 goto repeat;
179         }
180         return bn;
181 }
182 static inline void free_bitmap_node(struct super_block *sb,
183                                     struct reiserfs_bitmap_node *bn)
184 {
185         struct reiserfs_journal *journal = SB_JOURNAL(sb);
186         journal->j_used_bitmap_nodes--;
187         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
188                 kfree(bn->data);
189                 kfree(bn);
190         } else {
191                 list_add(&bn->list, &journal->j_bitmap_nodes);
192                 journal->j_free_bitmap_nodes++;
193         }
194 }
195 
196 static void allocate_bitmap_nodes(struct super_block *sb)
197 {
198         int i;
199         struct reiserfs_journal *journal = SB_JOURNAL(sb);
200         struct reiserfs_bitmap_node *bn = NULL;
201         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
202                 bn = allocate_bitmap_node(sb);
203                 if (bn) {
204                         list_add(&bn->list, &journal->j_bitmap_nodes);
205                         journal->j_free_bitmap_nodes++;
206                 } else {
207                         break;  /* this is ok, we'll try again when more are needed */
208                 }
209         }
210 }
211 
212 static int set_bit_in_list_bitmap(struct super_block *sb,
213                                   b_blocknr_t block,
214                                   struct reiserfs_list_bitmap *jb)
215 {
216         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
217         unsigned int bit_nr = block % (sb->s_blocksize << 3);
218 
219         if (!jb->bitmaps[bmap_nr]) {
220                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
221         }
222         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
223         return 0;
224 }
225 
226 static void cleanup_bitmap_list(struct super_block *sb,
227                                 struct reiserfs_list_bitmap *jb)
228 {
229         int i;
230         if (jb->bitmaps == NULL)
231                 return;
232 
233         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
234                 if (jb->bitmaps[i]) {
235                         free_bitmap_node(sb, jb->bitmaps[i]);
236                         jb->bitmaps[i] = NULL;
237                 }
238         }
239 }
240 
241 /*
242 ** only call this on FS unmount.
243 */
244 static int free_list_bitmaps(struct super_block *sb,
245                              struct reiserfs_list_bitmap *jb_array)
246 {
247         int i;
248         struct reiserfs_list_bitmap *jb;
249         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
250                 jb = jb_array + i;
251                 jb->journal_list = NULL;
252                 cleanup_bitmap_list(sb, jb);
253                 vfree(jb->bitmaps);
254                 jb->bitmaps = NULL;
255         }
256         return 0;
257 }
258 
259 static int free_bitmap_nodes(struct super_block *sb)
260 {
261         struct reiserfs_journal *journal = SB_JOURNAL(sb);
262         struct list_head *next = journal->j_bitmap_nodes.next;
263         struct reiserfs_bitmap_node *bn;
264 
265         while (next != &journal->j_bitmap_nodes) {
266                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
267                 list_del(next);
268                 kfree(bn->data);
269                 kfree(bn);
270                 next = journal->j_bitmap_nodes.next;
271                 journal->j_free_bitmap_nodes--;
272         }
273 
274         return 0;
275 }
276 
277 /*
278 ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
279 ** jb_array is the array to be filled in.
280 */
281 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
282                                    struct reiserfs_list_bitmap *jb_array,
283                                    unsigned int bmap_nr)
284 {
285         int i;
286         int failed = 0;
287         struct reiserfs_list_bitmap *jb;
288         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
289 
290         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
291                 jb = jb_array + i;
292                 jb->journal_list = NULL;
293                 jb->bitmaps = vzalloc(mem);
294                 if (!jb->bitmaps) {
295                         reiserfs_warning(sb, "clm-2000", "unable to "
296                                          "allocate bitmaps for journal lists");
297                         failed = 1;
298                         break;
299                 }
300         }
301         if (failed) {
302                 free_list_bitmaps(sb, jb_array);
303                 return -1;
304         }
305         return 0;
306 }
307 
308 /*
309 ** find an available list bitmap.  If you can't find one, flush a commit list
310 ** and try again
311 */
312 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
313                                                     struct reiserfs_journal_list
314                                                     *jl)
315 {
316         int i, j;
317         struct reiserfs_journal *journal = SB_JOURNAL(sb);
318         struct reiserfs_list_bitmap *jb = NULL;
319 
320         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
321                 i = journal->j_list_bitmap_index;
322                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
323                 jb = journal->j_list_bitmap + i;
324                 if (journal->j_list_bitmap[i].journal_list) {
325                         flush_commit_list(sb,
326                                           journal->j_list_bitmap[i].
327                                           journal_list, 1);
328                         if (!journal->j_list_bitmap[i].journal_list) {
329                                 break;
330                         }
331                 } else {
332                         break;
333                 }
334         }
335         if (jb->journal_list) { /* double check to make sure if flushed correctly */
336                 return NULL;
337         }
338         jb->journal_list = jl;
339         return jb;
340 }
341 
342 /*
343 ** allocates a new chunk of X nodes, and links them all together as a list.
344 ** Uses the cnode->next and cnode->prev pointers
345 ** returns NULL on failure
346 */
347 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
348 {
349         struct reiserfs_journal_cnode *head;
350         int i;
351         if (num_cnodes <= 0) {
352                 return NULL;
353         }
354         head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
355         if (!head) {
356                 return NULL;
357         }
358         head[0].prev = NULL;
359         head[0].next = head + 1;
360         for (i = 1; i < num_cnodes; i++) {
361                 head[i].prev = head + (i - 1);
362                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
363         }
364         head[num_cnodes - 1].next = NULL;
365         return head;
366 }
367 
368 /*
369 ** pulls a cnode off the free list, or returns NULL on failure
370 */
371 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
372 {
373         struct reiserfs_journal_cnode *cn;
374         struct reiserfs_journal *journal = SB_JOURNAL(sb);
375 
376         reiserfs_check_lock_depth(sb, "get_cnode");
377 
378         if (journal->j_cnode_free <= 0) {
379                 return NULL;
380         }
381         journal->j_cnode_used++;
382         journal->j_cnode_free--;
383         cn = journal->j_cnode_free_list;
384         if (!cn) {
385                 return cn;
386         }
387         if (cn->next) {
388                 cn->next->prev = NULL;
389         }
390         journal->j_cnode_free_list = cn->next;
391         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
392         return cn;
393 }
394 
395 /*
396 ** returns a cnode to the free list
397 */
398 static void free_cnode(struct super_block *sb,
399                        struct reiserfs_journal_cnode *cn)
400 {
401         struct reiserfs_journal *journal = SB_JOURNAL(sb);
402 
403         reiserfs_check_lock_depth(sb, "free_cnode");
404 
405         journal->j_cnode_used--;
406         journal->j_cnode_free++;
407         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
408         cn->next = journal->j_cnode_free_list;
409         if (journal->j_cnode_free_list) {
410                 journal->j_cnode_free_list->prev = cn;
411         }
412         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
413         journal->j_cnode_free_list = cn;
414 }
415 
416 static void clear_prepared_bits(struct buffer_head *bh)
417 {
418         clear_buffer_journal_prepared(bh);
419         clear_buffer_journal_restore_dirty(bh);
420 }
421 
422 /* return a cnode with same dev, block number and size in table, or null if not found */
423 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
424                                                                   super_block
425                                                                   *sb,
426                                                                   struct
427                                                                   reiserfs_journal_cnode
428                                                                   **table,
429                                                                   long bl)
430 {
431         struct reiserfs_journal_cnode *cn;
432         cn = journal_hash(table, sb, bl);
433         while (cn) {
434                 if (cn->blocknr == bl && cn->sb == sb)
435                         return cn;
436                 cn = cn->hnext;
437         }
438         return (struct reiserfs_journal_cnode *)0;
439 }
440 
441 /*
442 ** this actually means 'can this block be reallocated yet?'.  If you set search_all, a block can only be allocated
443 ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
444 ** being overwritten by a replay after crashing.
445 **
446 ** If you don't set search_all, a block can only be allocated if it is not in the current transaction.  Since deleting
447 ** a block removes it from the current transaction, this case should never happen.  If you don't set search_all, make
448 ** sure you never write the block without logging it.
449 **
450 ** next_zero_bit is a suggestion about the next block to try for find_forward.
451 ** when bl is rejected because it is set in a journal list bitmap, we search
452 ** for the next zero bit in the bitmap that rejected bl.  Then, we return that
453 ** through next_zero_bit for find_forward to try.
454 **
455 ** Just because we return something in next_zero_bit does not mean we won't
456 ** reject it on the next call to reiserfs_in_journal
457 **
458 */
459 int reiserfs_in_journal(struct super_block *sb,
460                         unsigned int bmap_nr, int bit_nr, int search_all,
461                         b_blocknr_t * next_zero_bit)
462 {
463         struct reiserfs_journal *journal = SB_JOURNAL(sb);
464         struct reiserfs_journal_cnode *cn;
465         struct reiserfs_list_bitmap *jb;
466         int i;
467         unsigned long bl;
468 
469         *next_zero_bit = 0;     /* always start this at zero. */
470 
471         PROC_INFO_INC(sb, journal.in_journal);
472         /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
473          ** if we crash before the transaction that freed it commits,  this transaction won't
474          ** have committed either, and the block will never be written
475          */
476         if (search_all) {
477                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
478                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
479                         jb = journal->j_list_bitmap + i;
480                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
481                             test_bit(bit_nr,
482                                      (unsigned long *)jb->bitmaps[bmap_nr]->
483                                      data)) {
484                                 *next_zero_bit =
485                                     find_next_zero_bit((unsigned long *)
486                                                        (jb->bitmaps[bmap_nr]->
487                                                         data),
488                                                        sb->s_blocksize << 3,
489                                                        bit_nr + 1);
490                                 return 1;
491                         }
492                 }
493         }
494 
495         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
496         /* is it in any old transactions? */
497         if (search_all
498             && (cn =
499                 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
500                 return 1;
501         }
502 
503         /* is it in the current transaction.  This should never happen */
504         if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
505                 BUG();
506                 return 1;
507         }
508 
509         PROC_INFO_INC(sb, journal.in_journal_reusable);
510         /* safe for reuse */
511         return 0;
512 }
513 
514 /* insert cn into table
515 */
516 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
517                                        struct reiserfs_journal_cnode *cn)
518 {
519         struct reiserfs_journal_cnode *cn_orig;
520 
521         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
522         cn->hnext = cn_orig;
523         cn->hprev = NULL;
524         if (cn_orig) {
525                 cn_orig->hprev = cn;
526         }
527         journal_hash(table, cn->sb, cn->blocknr) = cn;
528 }
529 
530 /* lock the current transaction */
531 static inline void lock_journal(struct super_block *sb)
532 {
533         PROC_INFO_INC(sb, journal.lock_journal);
534 
535         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
536 }
537 
538 /* unlock the current transaction */
539 static inline void unlock_journal(struct super_block *sb)
540 {
541         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
542 }
543 
544 static inline void get_journal_list(struct reiserfs_journal_list *jl)
545 {
546         jl->j_refcount++;
547 }
548 
549 static inline void put_journal_list(struct super_block *s,
550                                     struct reiserfs_journal_list *jl)
551 {
552         if (jl->j_refcount < 1) {
553                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
554                                jl->j_trans_id, jl->j_refcount);
555         }
556         if (--jl->j_refcount == 0)
557                 kfree(jl);
558 }
559 
560 /*
561 ** this used to be much more involved, and I'm keeping it just in case things get ugly again.
562 ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
563 ** transaction.
564 */
565 static void cleanup_freed_for_journal_list(struct super_block *sb,
566                                            struct reiserfs_journal_list *jl)
567 {
568 
569         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
570         if (jb) {
571                 cleanup_bitmap_list(sb, jb);
572         }
573         jl->j_list_bitmap->journal_list = NULL;
574         jl->j_list_bitmap = NULL;
575 }
576 
577 static int journal_list_still_alive(struct super_block *s,
578                                     unsigned int trans_id)
579 {
580         struct reiserfs_journal *journal = SB_JOURNAL(s);
581         struct list_head *entry = &journal->j_journal_list;
582         struct reiserfs_journal_list *jl;
583 
584         if (!list_empty(entry)) {
585                 jl = JOURNAL_LIST_ENTRY(entry->next);
586                 if (jl->j_trans_id <= trans_id) {
587                         return 1;
588                 }
589         }
590         return 0;
591 }
592 
593 /*
594  * If page->mapping was null, we failed to truncate this page for
595  * some reason.  Most likely because it was truncated after being
596  * logged via data=journal.
597  *
598  * This does a check to see if the buffer belongs to one of these
599  * lost pages before doing the final put_bh.  If page->mapping was
600  * null, it tries to free buffers on the page, which should make the
601  * final page_cache_release drop the page from the lru.
602  */
603 static void release_buffer_page(struct buffer_head *bh)
604 {
605         struct page *page = bh->b_page;
606         if (!page->mapping && trylock_page(page)) {
607                 page_cache_get(page);
608                 put_bh(bh);
609                 if (!page->mapping)
610                         try_to_free_buffers(page);
611                 unlock_page(page);
612                 page_cache_release(page);
613         } else {
614                 put_bh(bh);
615         }
616 }
617 
618 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
619 {
620         char b[BDEVNAME_SIZE];
621 
622         if (buffer_journaled(bh)) {
623                 reiserfs_warning(NULL, "clm-2084",
624                                  "pinned buffer %lu:%s sent to disk",
625                                  bh->b_blocknr, bdevname(bh->b_bdev, b));
626         }
627         if (uptodate)
628                 set_buffer_uptodate(bh);
629         else
630                 clear_buffer_uptodate(bh);
631 
632         unlock_buffer(bh);
633         release_buffer_page(bh);
634 }
635 
636 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
637 {
638         if (uptodate)
639                 set_buffer_uptodate(bh);
640         else
641                 clear_buffer_uptodate(bh);
642         unlock_buffer(bh);
643         put_bh(bh);
644 }
645 
646 static void submit_logged_buffer(struct buffer_head *bh)
647 {
648         get_bh(bh);
649         bh->b_end_io = reiserfs_end_buffer_io_sync;
650         clear_buffer_journal_new(bh);
651         clear_buffer_dirty(bh);
652         if (!test_clear_buffer_journal_test(bh))
653                 BUG();
654         if (!buffer_uptodate(bh))
655                 BUG();
656         submit_bh(WRITE, bh);
657 }
658 
659 static void submit_ordered_buffer(struct buffer_head *bh)
660 {
661         get_bh(bh);
662         bh->b_end_io = reiserfs_end_ordered_io;
663         clear_buffer_dirty(bh);
664         if (!buffer_uptodate(bh))
665                 BUG();
666         submit_bh(WRITE, bh);
667 }
668 
669 #define CHUNK_SIZE 32
670 struct buffer_chunk {
671         struct buffer_head *bh[CHUNK_SIZE];
672         int nr;
673 };
674 
675 static void write_chunk(struct buffer_chunk *chunk)
676 {
677         int i;
678         for (i = 0; i < chunk->nr; i++) {
679                 submit_logged_buffer(chunk->bh[i]);
680         }
681         chunk->nr = 0;
682 }
683 
684 static void write_ordered_chunk(struct buffer_chunk *chunk)
685 {
686         int i;
687         for (i = 0; i < chunk->nr; i++) {
688                 submit_ordered_buffer(chunk->bh[i]);
689         }
690         chunk->nr = 0;
691 }
692 
693 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
694                         spinlock_t * lock, void (fn) (struct buffer_chunk *))
695 {
696         int ret = 0;
697         BUG_ON(chunk->nr >= CHUNK_SIZE);
698         chunk->bh[chunk->nr++] = bh;
699         if (chunk->nr >= CHUNK_SIZE) {
700                 ret = 1;
701                 if (lock)
702                         spin_unlock(lock);
703                 fn(chunk);
704                 if (lock)
705                         spin_lock(lock);
706         }
707         return ret;
708 }
709 
710 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
711 static struct reiserfs_jh *alloc_jh(void)
712 {
713         struct reiserfs_jh *jh;
714         while (1) {
715                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
716                 if (jh) {
717                         atomic_inc(&nr_reiserfs_jh);
718                         return jh;
719                 }
720                 yield();
721         }
722 }
723 
724 /*
725  * we want to free the jh when the buffer has been written
726  * and waited on
727  */
728 void reiserfs_free_jh(struct buffer_head *bh)
729 {
730         struct reiserfs_jh *jh;
731 
732         jh = bh->b_private;
733         if (jh) {
734                 bh->b_private = NULL;
735                 jh->bh = NULL;
736                 list_del_init(&jh->list);
737                 kfree(jh);
738                 if (atomic_read(&nr_reiserfs_jh) <= 0)
739                         BUG();
740                 atomic_dec(&nr_reiserfs_jh);
741                 put_bh(bh);
742         }
743 }
744 
745 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
746                            int tail)
747 {
748         struct reiserfs_jh *jh;
749 
750         if (bh->b_private) {
751                 spin_lock(&j->j_dirty_buffers_lock);
752                 if (!bh->b_private) {
753                         spin_unlock(&j->j_dirty_buffers_lock);
754                         goto no_jh;
755                 }
756                 jh = bh->b_private;
757                 list_del_init(&jh->list);
758         } else {
759               no_jh:
760                 get_bh(bh);
761                 jh = alloc_jh();
762                 spin_lock(&j->j_dirty_buffers_lock);
763                 /* buffer must be locked for __add_jh, should be able to have
764                  * two adds at the same time
765                  */
766                 BUG_ON(bh->b_private);
767                 jh->bh = bh;
768                 bh->b_private = jh;
769         }
770         jh->jl = j->j_current_jl;
771         if (tail)
772                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
773         else {
774                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
775         }
776         spin_unlock(&j->j_dirty_buffers_lock);
777         return 0;
778 }
779 
780 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
781 {
782         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
783 }
784 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
785 {
786         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
787 }
788 
789 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
790 static int write_ordered_buffers(spinlock_t * lock,
791                                  struct reiserfs_journal *j,
792                                  struct reiserfs_journal_list *jl,
793                                  struct list_head *list)
794 {
795         struct buffer_head *bh;
796         struct reiserfs_jh *jh;
797         int ret = j->j_errno;
798         struct buffer_chunk chunk;
799         struct list_head tmp;
800         INIT_LIST_HEAD(&tmp);
801 
802         chunk.nr = 0;
803         spin_lock(lock);
804         while (!list_empty(list)) {
805                 jh = JH_ENTRY(list->next);
806                 bh = jh->bh;
807                 get_bh(bh);
808                 if (!trylock_buffer(bh)) {
809                         if (!buffer_dirty(bh)) {
810                                 list_move(&jh->list, &tmp);
811                                 goto loop_next;
812                         }
813                         spin_unlock(lock);
814                         if (chunk.nr)
815                                 write_ordered_chunk(&chunk);
816                         wait_on_buffer(bh);
817                         cond_resched();
818                         spin_lock(lock);
819                         goto loop_next;
820                 }
821                 /* in theory, dirty non-uptodate buffers should never get here,
822                  * but the upper layer io error paths still have a few quirks.
823                  * Handle them here as gracefully as we can
824                  */
825                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
826                         clear_buffer_dirty(bh);
827                         ret = -EIO;
828                 }
829                 if (buffer_dirty(bh)) {
830                         list_move(&jh->list, &tmp);
831                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
832                 } else {
833                         reiserfs_free_jh(bh);
834                         unlock_buffer(bh);
835                 }
836               loop_next:
837                 put_bh(bh);
838                 cond_resched_lock(lock);
839         }
840         if (chunk.nr) {
841                 spin_unlock(lock);
842                 write_ordered_chunk(&chunk);
843                 spin_lock(lock);
844         }
845         while (!list_empty(&tmp)) {
846                 jh = JH_ENTRY(tmp.prev);
847                 bh = jh->bh;
848                 get_bh(bh);
849                 reiserfs_free_jh(bh);
850 
851                 if (buffer_locked(bh)) {
852                         spin_unlock(lock);
853                         wait_on_buffer(bh);
854                         spin_lock(lock);
855                 }
856                 if (!buffer_uptodate(bh)) {
857                         ret = -EIO;
858                 }
859                 /* ugly interaction with invalidatepage here.
860                  * reiserfs_invalidate_page will pin any buffer that has a valid
861                  * journal head from an older transaction.  If someone else sets
862                  * our buffer dirty after we write it in the first loop, and
863                  * then someone truncates the page away, nobody will ever write
864                  * the buffer. We're safe if we write the page one last time
865                  * after freeing the journal header.
866                  */
867                 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
868                         spin_unlock(lock);
869                         ll_rw_block(WRITE, 1, &bh);
870                         spin_lock(lock);
871                 }
872                 put_bh(bh);
873                 cond_resched_lock(lock);
874         }
875         spin_unlock(lock);
876         return ret;
877 }
878 
879 static int flush_older_commits(struct super_block *s,
880                                struct reiserfs_journal_list *jl)
881 {
882         struct reiserfs_journal *journal = SB_JOURNAL(s);
883         struct reiserfs_journal_list *other_jl;
884         struct reiserfs_journal_list *first_jl;
885         struct list_head *entry;
886         unsigned int trans_id = jl->j_trans_id;
887         unsigned int other_trans_id;
888         unsigned int first_trans_id;
889 
890       find_first:
891         /*
892          * first we walk backwards to find the oldest uncommitted transation
893          */
894         first_jl = jl;
895         entry = jl->j_list.prev;
896         while (1) {
897                 other_jl = JOURNAL_LIST_ENTRY(entry);
898                 if (entry == &journal->j_journal_list ||
899                     atomic_read(&other_jl->j_older_commits_done))
900                         break;
901 
902                 first_jl = other_jl;
903                 entry = other_jl->j_list.prev;
904         }
905 
906         /* if we didn't find any older uncommitted transactions, return now */
907         if (first_jl == jl) {
908                 return 0;
909         }
910 
911         first_trans_id = first_jl->j_trans_id;
912 
913         entry = &first_jl->j_list;
914         while (1) {
915                 other_jl = JOURNAL_LIST_ENTRY(entry);
916                 other_trans_id = other_jl->j_trans_id;
917 
918                 if (other_trans_id < trans_id) {
919                         if (atomic_read(&other_jl->j_commit_left) != 0) {
920                                 flush_commit_list(s, other_jl, 0);
921 
922                                 /* list we were called with is gone, return */
923                                 if (!journal_list_still_alive(s, trans_id))
924                                         return 1;
925 
926                                 /* the one we just flushed is gone, this means all
927                                  * older lists are also gone, so first_jl is no longer
928                                  * valid either.  Go back to the beginning.
929                                  */
930                                 if (!journal_list_still_alive
931                                     (s, other_trans_id)) {
932                                         goto find_first;
933                                 }
934                         }
935                         entry = entry->next;
936                         if (entry == &journal->j_journal_list)
937                                 return 0;
938                 } else {
939                         return 0;
940                 }
941         }
942         return 0;
943 }
944 
945 static int reiserfs_async_progress_wait(struct super_block *s)
946 {
947         struct reiserfs_journal *j = SB_JOURNAL(s);
948 
949         if (atomic_read(&j->j_async_throttle)) {
950                 reiserfs_write_unlock(s);
951                 congestion_wait(BLK_RW_ASYNC, HZ / 10);
952                 reiserfs_write_lock(s);
953         }
954 
955         return 0;
956 }
957 
958 /*
959 ** if this journal list still has commit blocks unflushed, send them to disk.
960 **
961 ** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
962 ** Before the commit block can by written, every other log block must be safely on disk
963 **
964 */
965 static int flush_commit_list(struct super_block *s,
966                              struct reiserfs_journal_list *jl, int flushall)
967 {
968         int i;
969         b_blocknr_t bn;
970         struct buffer_head *tbh = NULL;
971         unsigned int trans_id = jl->j_trans_id;
972         struct reiserfs_journal *journal = SB_JOURNAL(s);
973         int retval = 0;
974         int write_len;
975 
976         reiserfs_check_lock_depth(s, "flush_commit_list");
977 
978         if (atomic_read(&jl->j_older_commits_done)) {
979                 return 0;
980         }
981 
982         /* before we can put our commit blocks on disk, we have to make sure everyone older than
983          ** us is on disk too
984          */
985         BUG_ON(jl->j_len <= 0);
986         BUG_ON(trans_id == journal->j_trans_id);
987 
988         get_journal_list(jl);
989         if (flushall) {
990                 if (flush_older_commits(s, jl) == 1) {
991                         /* list disappeared during flush_older_commits.  return */
992                         goto put_jl;
993                 }
994         }
995 
996         /* make sure nobody is trying to flush this one at the same time */
997         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
998 
999         if (!journal_list_still_alive(s, trans_id)) {
1000                 mutex_unlock(&jl->j_commit_mutex);
1001                 goto put_jl;
1002         }
1003         BUG_ON(jl->j_trans_id == 0);
1004 
1005         /* this commit is done, exit */
1006         if (atomic_read(&(jl->j_commit_left)) <= 0) {
1007                 if (flushall) {
1008                         atomic_set(&(jl->j_older_commits_done), 1);
1009                 }
1010                 mutex_unlock(&jl->j_commit_mutex);
1011                 goto put_jl;
1012         }
1013 
1014         if (!list_empty(&jl->j_bh_list)) {
1015                 int ret;
1016 
1017                 /*
1018                  * We might sleep in numerous places inside
1019                  * write_ordered_buffers. Relax the write lock.
1020                  */
1021                 reiserfs_write_unlock(s);
1022                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1023                                             journal, jl, &jl->j_bh_list);
1024                 if (ret < 0 && retval == 0)
1025                         retval = ret;
1026                 reiserfs_write_lock(s);
1027         }
1028         BUG_ON(!list_empty(&jl->j_bh_list));
1029         /*
1030          * for the description block and all the log blocks, submit any buffers
1031          * that haven't already reached the disk.  Try to write at least 256
1032          * log blocks. later on, we will only wait on blocks that correspond
1033          * to this transaction, but while we're unplugging we might as well
1034          * get a chunk of data on there.
1035          */
1036         atomic_inc(&journal->j_async_throttle);
1037         write_len = jl->j_len + 1;
1038         if (write_len < 256)
1039                 write_len = 256;
1040         for (i = 0 ; i < write_len ; i++) {
1041                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1042                     SB_ONDISK_JOURNAL_SIZE(s);
1043                 tbh = journal_find_get_block(s, bn);
1044                 if (tbh) {
1045                         if (buffer_dirty(tbh)) {
1046                             reiserfs_write_unlock(s);
1047                             ll_rw_block(WRITE, 1, &tbh);
1048                             reiserfs_write_lock(s);
1049                         }
1050                         put_bh(tbh) ;
1051                 }
1052         }
1053         atomic_dec(&journal->j_async_throttle);
1054 
1055         for (i = 0; i < (jl->j_len + 1); i++) {
1056                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1057                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1058                 tbh = journal_find_get_block(s, bn);
1059 
1060                 reiserfs_write_unlock(s);
1061                 wait_on_buffer(tbh);
1062                 reiserfs_write_lock(s);
1063                 // since we're using ll_rw_blk above, it might have skipped over
1064                 // a locked buffer.  Double check here
1065                 //
1066                 /* redundant, sync_dirty_buffer() checks */
1067                 if (buffer_dirty(tbh)) {
1068                         reiserfs_write_unlock(s);
1069                         sync_dirty_buffer(tbh);
1070                         reiserfs_write_lock(s);
1071                 }
1072                 if (unlikely(!buffer_uptodate(tbh))) {
1073 #ifdef CONFIG_REISERFS_CHECK
1074                         reiserfs_warning(s, "journal-601",
1075                                          "buffer write failed");
1076 #endif
1077                         retval = -EIO;
1078                 }
1079                 put_bh(tbh);    /* once for journal_find_get_block */
1080                 put_bh(tbh);    /* once due to original getblk in do_journal_end */
1081                 atomic_dec(&(jl->j_commit_left));
1082         }
1083 
1084         BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1085 
1086         /* If there was a write error in the journal - we can't commit
1087          * this transaction - it will be invalid and, if successful,
1088          * will just end up propagating the write error out to
1089          * the file system. */
1090         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1091                 if (buffer_dirty(jl->j_commit_bh))
1092                         BUG();
1093                 mark_buffer_dirty(jl->j_commit_bh) ;
1094                 reiserfs_write_unlock(s);
1095                 if (reiserfs_barrier_flush(s))
1096                         __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1097                 else
1098                         sync_dirty_buffer(jl->j_commit_bh);
1099                 reiserfs_write_lock(s);
1100         }
1101 
1102         /* If there was a write error in the journal - we can't commit this
1103          * transaction - it will be invalid and, if successful, will just end
1104          * up propagating the write error out to the filesystem. */
1105         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1106 #ifdef CONFIG_REISERFS_CHECK
1107                 reiserfs_warning(s, "journal-615", "buffer write failed");
1108 #endif
1109                 retval = -EIO;
1110         }
1111         bforget(jl->j_commit_bh);
1112         if (journal->j_last_commit_id != 0 &&
1113             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1114                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1115                                  journal->j_last_commit_id, jl->j_trans_id);
1116         }
1117         journal->j_last_commit_id = jl->j_trans_id;
1118 
1119         /* now, every commit block is on the disk.  It is safe to allow blocks freed during this transaction to be reallocated */
1120         cleanup_freed_for_journal_list(s, jl);
1121 
1122         retval = retval ? retval : journal->j_errno;
1123 
1124         /* mark the metadata dirty */
1125         if (!retval)
1126                 dirty_one_transaction(s, jl);
1127         atomic_dec(&(jl->j_commit_left));
1128 
1129         if (flushall) {
1130                 atomic_set(&(jl->j_older_commits_done), 1);
1131         }
1132         mutex_unlock(&jl->j_commit_mutex);
1133       put_jl:
1134         put_journal_list(s, jl);
1135 
1136         if (retval)
1137                 reiserfs_abort(s, retval, "Journal write error in %s",
1138                                __func__);
1139         return retval;
1140 }
1141 
1142 /*
1143 ** flush_journal_list frequently needs to find a newer transaction for a given block.  This does that, or
1144 ** returns NULL if it can't find anything
1145 */
1146 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1147                                                           reiserfs_journal_cnode
1148                                                           *cn)
1149 {
1150         struct super_block *sb = cn->sb;
1151         b_blocknr_t blocknr = cn->blocknr;
1152 
1153         cn = cn->hprev;
1154         while (cn) {
1155                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1156                         return cn->jlist;
1157                 }
1158                 cn = cn->hprev;
1159         }
1160         return NULL;
1161 }
1162 
1163 static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1164 {
1165         struct super_block *sb = cn->sb;
1166         b_blocknr_t blocknr = cn->blocknr;
1167 
1168         cn = cn->hprev;
1169         while (cn) {
1170                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1171                     atomic_read(&cn->jlist->j_commit_left) != 0)
1172                                     return 0;
1173                 cn = cn->hprev;
1174         }
1175         return 1;
1176 }
1177 
1178 static void remove_journal_hash(struct super_block *,
1179                                 struct reiserfs_journal_cnode **,
1180                                 struct reiserfs_journal_list *, unsigned long,
1181                                 int);
1182 
1183 /*
1184 ** once all the real blocks have been flushed, it is safe to remove them from the
1185 ** journal list for this transaction.  Aside from freeing the cnode, this also allows the
1186 ** block to be reallocated for data blocks if it had been deleted.
1187 */
1188 static void remove_all_from_journal_list(struct super_block *sb,
1189                                          struct reiserfs_journal_list *jl,
1190                                          int debug)
1191 {
1192         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1193         struct reiserfs_journal_cnode *cn, *last;
1194         cn = jl->j_realblock;
1195 
1196         /* which is better, to lock once around the whole loop, or
1197          ** to lock for each call to remove_journal_hash?
1198          */
1199         while (cn) {
1200                 if (cn->blocknr != 0) {
1201                         if (debug) {
1202                                 reiserfs_warning(sb, "reiserfs-2201",
1203                                                  "block %u, bh is %d, state %ld",
1204                                                  cn->blocknr, cn->bh ? 1 : 0,
1205                                                  cn->state);
1206                         }
1207                         cn->state = 0;
1208                         remove_journal_hash(sb, journal->j_list_hash_table,
1209                                             jl, cn->blocknr, 1);
1210                 }
1211                 last = cn;
1212                 cn = cn->next;
1213                 free_cnode(sb, last);
1214         }
1215         jl->j_realblock = NULL;
1216 }
1217 
1218 /*
1219 ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1220 ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1221 ** releasing blocks in this transaction for reuse as data blocks.
1222 ** called by flush_journal_list, before it calls remove_all_from_journal_list
1223 **
1224 */
1225 static int _update_journal_header_block(struct super_block *sb,
1226                                         unsigned long offset,
1227                                         unsigned int trans_id)
1228 {
1229         struct reiserfs_journal_header *jh;
1230         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1231 
1232         if (reiserfs_is_journal_aborted(journal))
1233                 return -EIO;
1234 
1235         if (trans_id >= journal->j_last_flush_trans_id) {
1236                 if (buffer_locked((journal->j_header_bh))) {
1237                         reiserfs_write_unlock(sb);
1238                         wait_on_buffer((journal->j_header_bh));
1239                         reiserfs_write_lock(sb);
1240                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1241 #ifdef CONFIG_REISERFS_CHECK
1242                                 reiserfs_warning(sb, "journal-699",
1243                                                  "buffer write failed");
1244 #endif
1245                                 return -EIO;
1246                         }
1247                 }
1248                 journal->j_last_flush_trans_id = trans_id;
1249                 journal->j_first_unflushed_offset = offset;
1250                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1251                                                         b_data);
1252                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1253                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1254                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1255 
1256                 set_buffer_dirty(journal->j_header_bh);
1257                 reiserfs_write_unlock(sb);
1258 
1259                 if (reiserfs_barrier_flush(sb))
1260                         __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1261                 else
1262                         sync_dirty_buffer(journal->j_header_bh);
1263 
1264                 reiserfs_write_lock(sb);
1265                 if (!buffer_uptodate(journal->j_header_bh)) {
1266                         reiserfs_warning(sb, "journal-837",
1267                                          "IO error during journal replay");
1268                         return -EIO;
1269                 }
1270         }
1271         return 0;
1272 }
1273 
1274 static int update_journal_header_block(struct super_block *sb,
1275                                        unsigned long offset,
1276                                        unsigned int trans_id)
1277 {
1278         return _update_journal_header_block(sb, offset, trans_id);
1279 }
1280 
1281 /*
1282 ** flush any and all journal lists older than you are
1283 ** can only be called from flush_journal_list
1284 */
1285 static int flush_older_journal_lists(struct super_block *sb,
1286                                      struct reiserfs_journal_list *jl)
1287 {
1288         struct list_head *entry;
1289         struct reiserfs_journal_list *other_jl;
1290         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1291         unsigned int trans_id = jl->j_trans_id;
1292 
1293         /* we know we are the only ones flushing things, no extra race
1294          * protection is required.
1295          */
1296       restart:
1297         entry = journal->j_journal_list.next;
1298         /* Did we wrap? */
1299         if (entry == &journal->j_journal_list)
1300                 return 0;
1301         other_jl = JOURNAL_LIST_ENTRY(entry);
1302         if (other_jl->j_trans_id < trans_id) {
1303                 BUG_ON(other_jl->j_refcount <= 0);
1304                 /* do not flush all */
1305                 flush_journal_list(sb, other_jl, 0);
1306 
1307                 /* other_jl is now deleted from the list */
1308                 goto restart;
1309         }
1310         return 0;
1311 }
1312 
1313 static void del_from_work_list(struct super_block *s,
1314                                struct reiserfs_journal_list *jl)
1315 {
1316         struct reiserfs_journal *journal = SB_JOURNAL(s);
1317         if (!list_empty(&jl->j_working_list)) {
1318                 list_del_init(&jl->j_working_list);
1319                 journal->j_num_work_lists--;
1320         }
1321 }
1322 
1323 /* flush a journal list, both commit and real blocks
1324 **
1325 ** always set flushall to 1, unless you are calling from inside
1326 ** flush_journal_list
1327 **
1328 ** IMPORTANT.  This can only be called while there are no journal writers,
1329 ** and the journal is locked.  That means it can only be called from
1330 ** do_journal_end, or by journal_release
1331 */
1332 static int flush_journal_list(struct super_block *s,
1333                               struct reiserfs_journal_list *jl, int flushall)
1334 {
1335         struct reiserfs_journal_list *pjl;
1336         struct reiserfs_journal_cnode *cn, *last;
1337         int count;
1338         int was_jwait = 0;
1339         int was_dirty = 0;
1340         struct buffer_head *saved_bh;
1341         unsigned long j_len_saved = jl->j_len;
1342         struct reiserfs_journal *journal = SB_JOURNAL(s);
1343         int err = 0;
1344 
1345         BUG_ON(j_len_saved <= 0);
1346 
1347         if (atomic_read(&journal->j_wcount) != 0) {
1348                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1349                                  atomic_read(&journal->j_wcount));
1350         }
1351         BUG_ON(jl->j_trans_id == 0);
1352 
1353         /* if flushall == 0, the lock is already held */
1354         if (flushall) {
1355                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1356         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1357                 BUG();
1358         }
1359 
1360         count = 0;
1361         if (j_len_saved > journal->j_trans_max) {
1362                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1363                                j_len_saved, jl->j_trans_id);
1364                 return 0;
1365         }
1366 
1367         /* if all the work is already done, get out of here */
1368         if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1369             atomic_read(&(jl->j_commit_left)) <= 0) {
1370                 goto flush_older_and_return;
1371         }
1372 
1373         /* start by putting the commit list on disk.  This will also flush
1374          ** the commit lists of any olders transactions
1375          */
1376         flush_commit_list(s, jl, 1);
1377 
1378         if (!(jl->j_state & LIST_DIRTY)
1379             && !reiserfs_is_journal_aborted(journal))
1380                 BUG();
1381 
1382         /* are we done now? */
1383         if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1384             atomic_read(&(jl->j_commit_left)) <= 0) {
1385                 goto flush_older_and_return;
1386         }
1387 
1388         /* loop through each cnode, see if we need to write it,
1389          ** or wait on a more recent transaction, or just ignore it
1390          */
1391         if (atomic_read(&(journal->j_wcount)) != 0) {
1392                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1393                                "wcount is not 0");
1394         }
1395         cn = jl->j_realblock;
1396         while (cn) {
1397                 was_jwait = 0;
1398                 was_dirty = 0;
1399                 saved_bh = NULL;
1400                 /* blocknr of 0 is no longer in the hash, ignore it */
1401                 if (cn->blocknr == 0) {
1402                         goto free_cnode;
1403                 }
1404 
1405                 /* This transaction failed commit. Don't write out to the disk */
1406                 if (!(jl->j_state & LIST_DIRTY))
1407                         goto free_cnode;
1408 
1409                 pjl = find_newer_jl_for_cn(cn);
1410                 /* the order is important here.  We check pjl to make sure we
1411                  ** don't clear BH_JDirty_wait if we aren't the one writing this
1412                  ** block to disk
1413                  */
1414                 if (!pjl && cn->bh) {
1415                         saved_bh = cn->bh;
1416 
1417                         /* we do this to make sure nobody releases the buffer while
1418                          ** we are working with it
1419                          */
1420                         get_bh(saved_bh);
1421 
1422                         if (buffer_journal_dirty(saved_bh)) {
1423                                 BUG_ON(!can_dirty(cn));
1424                                 was_jwait = 1;
1425                                 was_dirty = 1;
1426                         } else if (can_dirty(cn)) {
1427                                 /* everything with !pjl && jwait should be writable */
1428                                 BUG();
1429                         }
1430                 }
1431 
1432                 /* if someone has this block in a newer transaction, just make
1433                  ** sure they are committed, and don't try writing it to disk
1434                  */
1435                 if (pjl) {
1436                         if (atomic_read(&pjl->j_commit_left))
1437                                 flush_commit_list(s, pjl, 1);
1438                         goto free_cnode;
1439                 }
1440 
1441                 /* bh == NULL when the block got to disk on its own, OR,
1442                  ** the block got freed in a future transaction
1443                  */
1444                 if (saved_bh == NULL) {
1445                         goto free_cnode;
1446                 }
1447 
1448                 /* this should never happen.  kupdate_one_transaction has this list
1449                  ** locked while it works, so we should never see a buffer here that
1450                  ** is not marked JDirty_wait
1451                  */
1452                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1453                         reiserfs_warning(s, "journal-813",
1454                                          "BAD! buffer %llu %cdirty %cjwait, "
1455                                          "not in a newer tranasction",
1456                                          (unsigned long long)saved_bh->
1457                                          b_blocknr, was_dirty ? ' ' : '!',
1458                                          was_jwait ? ' ' : '!');
1459                 }
1460                 if (was_dirty) {
1461                         /* we inc again because saved_bh gets decremented at free_cnode */
1462                         get_bh(saved_bh);
1463                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1464                         lock_buffer(saved_bh);
1465                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1466                         if (buffer_dirty(saved_bh))
1467                                 submit_logged_buffer(saved_bh);
1468                         else
1469                                 unlock_buffer(saved_bh);
1470                         count++;
1471                 } else {
1472                         reiserfs_warning(s, "clm-2082",
1473                                          "Unable to flush buffer %llu in %s",
1474                                          (unsigned long long)saved_bh->
1475                                          b_blocknr, __func__);
1476                 }
1477               free_cnode:
1478                 last = cn;
1479                 cn = cn->next;
1480                 if (saved_bh) {
1481                         /* we incremented this to keep others from taking the buffer head away */
1482                         put_bh(saved_bh);
1483                         if (atomic_read(&(saved_bh->b_count)) < 0) {
1484                                 reiserfs_warning(s, "journal-945",
1485                                                  "saved_bh->b_count < 0");
1486                         }
1487                 }
1488         }
1489         if (count > 0) {
1490                 cn = jl->j_realblock;
1491                 while (cn) {
1492                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1493                                 if (!cn->bh) {
1494                                         reiserfs_panic(s, "journal-1011",
1495                                                        "cn->bh is NULL");
1496                                 }
1497 
1498                                 reiserfs_write_unlock(s);
1499                                 wait_on_buffer(cn->bh);
1500                                 reiserfs_write_lock(s);
1501 
1502                                 if (!cn->bh) {
1503                                         reiserfs_panic(s, "journal-1012",
1504                                                        "cn->bh is NULL");
1505                                 }
1506                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1507 #ifdef CONFIG_REISERFS_CHECK
1508                                         reiserfs_warning(s, "journal-949",
1509                                                          "buffer write failed");
1510 #endif
1511                                         err = -EIO;
1512                                 }
1513                                 /* note, we must clear the JDirty_wait bit after the up to date
1514                                  ** check, otherwise we race against our flushpage routine
1515                                  */
1516                                 BUG_ON(!test_clear_buffer_journal_dirty
1517                                        (cn->bh));
1518 
1519                                 /* drop one ref for us */
1520                                 put_bh(cn->bh);
1521                                 /* drop one ref for journal_mark_dirty */
1522                                 release_buffer_page(cn->bh);
1523                         }
1524                         cn = cn->next;
1525                 }
1526         }
1527 
1528         if (err)
1529                 reiserfs_abort(s, -EIO,
1530                                "Write error while pushing transaction to disk in %s",
1531                                __func__);
1532       flush_older_and_return:
1533 
1534         /* before we can update the journal header block, we _must_ flush all
1535          ** real blocks from all older transactions to disk.  This is because
1536          ** once the header block is updated, this transaction will not be
1537          ** replayed after a crash
1538          */
1539         if (flushall) {
1540                 flush_older_journal_lists(s, jl);
1541         }
1542 
1543         err = journal->j_errno;
1544         /* before we can remove everything from the hash tables for this
1545          ** transaction, we must make sure it can never be replayed
1546          **
1547          ** since we are only called from do_journal_end, we know for sure there
1548          ** are no allocations going on while we are flushing journal lists.  So,
1549          ** we only need to update the journal header block for the last list
1550          ** being flushed
1551          */
1552         if (!err && flushall) {
1553                 err =
1554                     update_journal_header_block(s,
1555                                                 (jl->j_start + jl->j_len +
1556                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1557                                                 jl->j_trans_id);
1558                 if (err)
1559                         reiserfs_abort(s, -EIO,
1560                                        "Write error while updating journal header in %s",
1561                                        __func__);
1562         }
1563         remove_all_from_journal_list(s, jl, 0);
1564         list_del_init(&jl->j_list);
1565         journal->j_num_lists--;
1566         del_from_work_list(s, jl);
1567 
1568         if (journal->j_last_flush_id != 0 &&
1569             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1570                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1571                                  journal->j_last_flush_id, jl->j_trans_id);
1572         }
1573         journal->j_last_flush_id = jl->j_trans_id;
1574 
1575         /* not strictly required since we are freeing the list, but it should
1576          * help find code using dead lists later on
1577          */
1578         jl->j_len = 0;
1579         atomic_set(&(jl->j_nonzerolen), 0);
1580         jl->j_start = 0;
1581         jl->j_realblock = NULL;
1582         jl->j_commit_bh = NULL;
1583         jl->j_trans_id = 0;
1584         jl->j_state = 0;
1585         put_journal_list(s, jl);
1586         if (flushall)
1587                 mutex_unlock(&journal->j_flush_mutex);
1588         return err;
1589 }
1590 
1591 static int test_transaction(struct super_block *s,
1592                             struct reiserfs_journal_list *jl)
1593 {
1594         struct reiserfs_journal_cnode *cn;
1595 
1596         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1597                 return 1;
1598 
1599         cn = jl->j_realblock;
1600         while (cn) {
1601                 /* if the blocknr == 0, this has been cleared from the hash,
1602                  ** skip it
1603                  */
1604                 if (cn->blocknr == 0) {
1605                         goto next;
1606                 }
1607                 if (cn->bh && !newer_jl_done(cn))
1608                         return 0;
1609               next:
1610                 cn = cn->next;
1611                 cond_resched();
1612         }
1613         return 0;
1614 }
1615 
1616 static int write_one_transaction(struct super_block *s,
1617                                  struct reiserfs_journal_list *jl,
1618                                  struct buffer_chunk *chunk)
1619 {
1620         struct reiserfs_journal_cnode *cn;
1621         int ret = 0;
1622 
1623         jl->j_state |= LIST_TOUCHED;
1624         del_from_work_list(s, jl);
1625         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1626                 return 0;
1627         }
1628 
1629         cn = jl->j_realblock;
1630         while (cn) {
1631                 /* if the blocknr == 0, this has been cleared from the hash,
1632                  ** skip it
1633                  */
1634                 if (cn->blocknr == 0) {
1635                         goto next;
1636                 }
1637                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1638                         struct buffer_head *tmp_bh;
1639                         /* we can race against journal_mark_freed when we try
1640                          * to lock_buffer(cn->bh), so we have to inc the buffer
1641                          * count, and recheck things after locking
1642                          */
1643                         tmp_bh = cn->bh;
1644                         get_bh(tmp_bh);
1645                         lock_buffer(tmp_bh);
1646                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1647                                 if (!buffer_journal_dirty(tmp_bh) ||
1648                                     buffer_journal_prepared(tmp_bh))
1649                                         BUG();
1650                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1651                                 ret++;
1652                         } else {
1653                                 /* note, cn->bh might be null now */
1654                                 unlock_buffer(tmp_bh);
1655                         }
1656                         put_bh(tmp_bh);
1657                 }
1658               next:
1659                 cn = cn->next;
1660                 cond_resched();
1661         }
1662         return ret;
1663 }
1664 
1665 /* used by flush_commit_list */
1666 static int dirty_one_transaction(struct super_block *s,
1667                                  struct reiserfs_journal_list *jl)
1668 {
1669         struct reiserfs_journal_cnode *cn;
1670         struct reiserfs_journal_list *pjl;
1671         int ret = 0;
1672 
1673         jl->j_state |= LIST_DIRTY;
1674         cn = jl->j_realblock;
1675         while (cn) {
1676                 /* look for a more recent transaction that logged this
1677                  ** buffer.  Only the most recent transaction with a buffer in
1678                  ** it is allowed to send that buffer to disk
1679                  */
1680                 pjl = find_newer_jl_for_cn(cn);
1681                 if (!pjl && cn->blocknr && cn->bh
1682                     && buffer_journal_dirty(cn->bh)) {
1683                         BUG_ON(!can_dirty(cn));
1684                         /* if the buffer is prepared, it will either be logged
1685                          * or restored.  If restored, we need to make sure
1686                          * it actually gets marked dirty
1687                          */
1688                         clear_buffer_journal_new(cn->bh);
1689                         if (buffer_journal_prepared(cn->bh)) {
1690                                 set_buffer_journal_restore_dirty(cn->bh);
1691                         } else {
1692                                 set_buffer_journal_test(cn->bh);
1693                                 mark_buffer_dirty(cn->bh);
1694                         }
1695                 }
1696                 cn = cn->next;
1697         }
1698         return ret;
1699 }
1700 
1701 static int kupdate_transactions(struct super_block *s,
1702                                 struct reiserfs_journal_list *jl,
1703                                 struct reiserfs_journal_list **next_jl,
1704                                 unsigned int *next_trans_id,
1705                                 int num_blocks, int num_trans)
1706 {
1707         int ret = 0;
1708         int written = 0;
1709         int transactions_flushed = 0;
1710         unsigned int orig_trans_id = jl->j_trans_id;
1711         struct buffer_chunk chunk;
1712         struct list_head *entry;
1713         struct reiserfs_journal *journal = SB_JOURNAL(s);
1714         chunk.nr = 0;
1715 
1716         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1717         if (!journal_list_still_alive(s, orig_trans_id)) {
1718                 goto done;
1719         }
1720 
1721         /* we've got j_flush_mutex held, nobody is going to delete any
1722          * of these lists out from underneath us
1723          */
1724         while ((num_trans && transactions_flushed < num_trans) ||
1725                (!num_trans && written < num_blocks)) {
1726 
1727                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1728                     atomic_read(&jl->j_commit_left)
1729                     || !(jl->j_state & LIST_DIRTY)) {
1730                         del_from_work_list(s, jl);
1731                         break;
1732                 }
1733                 ret = write_one_transaction(s, jl, &chunk);
1734 
1735                 if (ret < 0)
1736                         goto done;
1737                 transactions_flushed++;
1738                 written += ret;
1739                 entry = jl->j_list.next;
1740 
1741                 /* did we wrap? */
1742                 if (entry == &journal->j_journal_list) {
1743                         break;
1744                 }
1745                 jl = JOURNAL_LIST_ENTRY(entry);
1746 
1747                 /* don't bother with older transactions */
1748                 if (jl->j_trans_id <= orig_trans_id)
1749                         break;
1750         }
1751         if (chunk.nr) {
1752                 write_chunk(&chunk);
1753         }
1754 
1755       done:
1756         mutex_unlock(&journal->j_flush_mutex);
1757         return ret;
1758 }
1759 
1760 /* for o_sync and fsync heavy applications, they tend to use
1761 ** all the journa list slots with tiny transactions.  These
1762 ** trigger lots and lots of calls to update the header block, which
1763 ** adds seeks and slows things down.
1764 **
1765 ** This function tries to clear out a large chunk of the journal lists
1766 ** at once, which makes everything faster since only the newest journal
1767 ** list updates the header block
1768 */
1769 static int flush_used_journal_lists(struct super_block *s,
1770                                     struct reiserfs_journal_list *jl)
1771 {
1772         unsigned long len = 0;
1773         unsigned long cur_len;
1774         int ret;
1775         int i;
1776         int limit = 256;
1777         struct reiserfs_journal_list *tjl;
1778         struct reiserfs_journal_list *flush_jl;
1779         unsigned int trans_id;
1780         struct reiserfs_journal *journal = SB_JOURNAL(s);
1781 
1782         flush_jl = tjl = jl;
1783 
1784         /* in data logging mode, try harder to flush a lot of blocks */
1785         if (reiserfs_data_log(s))
1786                 limit = 1024;
1787         /* flush for 256 transactions or limit blocks, whichever comes first */
1788         for (i = 0; i < 256 && len < limit; i++) {
1789                 if (atomic_read(&tjl->j_commit_left) ||
1790                     tjl->j_trans_id < jl->j_trans_id) {
1791                         break;
1792                 }
1793                 cur_len = atomic_read(&tjl->j_nonzerolen);
1794                 if (cur_len > 0) {
1795                         tjl->j_state &= ~LIST_TOUCHED;
1796                 }
1797                 len += cur_len;
1798                 flush_jl = tjl;
1799                 if (tjl->j_list.next == &journal->j_journal_list)
1800                         break;
1801                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1802         }
1803         /* try to find a group of blocks we can flush across all the
1804          ** transactions, but only bother if we've actually spanned
1805          ** across multiple lists
1806          */
1807         if (flush_jl != jl) {
1808                 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1809         }
1810         flush_journal_list(s, flush_jl, 1);
1811         return 0;
1812 }
1813 
1814 /*
1815 ** removes any nodes in table with name block and dev as bh.
1816 ** only touchs the hnext and hprev pointers.
1817 */
1818 void remove_journal_hash(struct super_block *sb,
1819                          struct reiserfs_journal_cnode **table,
1820                          struct reiserfs_journal_list *jl,
1821                          unsigned long block, int remove_freed)
1822 {
1823         struct reiserfs_journal_cnode *cur;
1824         struct reiserfs_journal_cnode **head;
1825 
1826         head = &(journal_hash(table, sb, block));
1827         if (!head) {
1828                 return;
1829         }
1830         cur = *head;
1831         while (cur) {
1832                 if (cur->blocknr == block && cur->sb == sb
1833                     && (jl == NULL || jl == cur->jlist)
1834                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1835                         if (cur->hnext) {
1836                                 cur->hnext->hprev = cur->hprev;
1837                         }
1838                         if (cur->hprev) {
1839                                 cur->hprev->hnext = cur->hnext;
1840                         } else {
1841                                 *head = cur->hnext;
1842                         }
1843                         cur->blocknr = 0;
1844                         cur->sb = NULL;
1845                         cur->state = 0;
1846                         if (cur->bh && cur->jlist)      /* anybody who clears the cur->bh will also dec the nonzerolen */
1847                                 atomic_dec(&(cur->jlist->j_nonzerolen));
1848                         cur->bh = NULL;
1849                         cur->jlist = NULL;
1850                 }
1851                 cur = cur->hnext;
1852         }
1853 }
1854 
1855 static void free_journal_ram(struct super_block *sb)
1856 {
1857         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1858         kfree(journal->j_current_jl);
1859         journal->j_num_lists--;
1860 
1861         vfree(journal->j_cnode_free_orig);
1862         free_list_bitmaps(sb, journal->j_list_bitmap);
1863         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1864         if (journal->j_header_bh) {
1865                 brelse(journal->j_header_bh);
1866         }
1867         /* j_header_bh is on the journal dev, make sure not to release the journal
1868          * dev until we brelse j_header_bh
1869          */
1870         release_journal_dev(sb, journal);
1871         vfree(journal);
1872 }
1873 
1874 /*
1875 ** call on unmount.  Only set error to 1 if you haven't made your way out
1876 ** of read_super() yet.  Any other caller must keep error at 0.
1877 */
1878 static int do_journal_release(struct reiserfs_transaction_handle *th,
1879                               struct super_block *sb, int error)
1880 {
1881         struct reiserfs_transaction_handle myth;
1882         int flushed = 0;
1883         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1884 
1885         /* we only want to flush out transactions if we were called with error == 0
1886          */
1887         if (!error && !(sb->s_flags & MS_RDONLY)) {
1888                 /* end the current trans */
1889                 BUG_ON(!th->t_trans_id);
1890                 do_journal_end(th, sb, 10, FLUSH_ALL);
1891 
1892                 /* make sure something gets logged to force our way into the flush code */
1893                 if (!journal_join(&myth, sb, 1)) {
1894                         reiserfs_prepare_for_journal(sb,
1895                                                      SB_BUFFER_WITH_SB(sb),
1896                                                      1);
1897                         journal_mark_dirty(&myth, sb,
1898                                            SB_BUFFER_WITH_SB(sb));
1899                         do_journal_end(&myth, sb, 1, FLUSH_ALL);
1900                         flushed = 1;
1901                 }
1902         }
1903 
1904         /* this also catches errors during the do_journal_end above */
1905         if (!error && reiserfs_is_journal_aborted(journal)) {
1906                 memset(&myth, 0, sizeof(myth));
1907                 if (!journal_join_abort(&myth, sb, 1)) {
1908                         reiserfs_prepare_for_journal(sb,
1909                                                      SB_BUFFER_WITH_SB(sb),
1910                                                      1);
1911                         journal_mark_dirty(&myth, sb,
1912                                            SB_BUFFER_WITH_SB(sb));
1913                         do_journal_end(&myth, sb, 1, FLUSH_ALL);
1914                 }
1915         }
1916 
1917         reiserfs_mounted_fs_count--;
1918         /* wait for all commits to finish */
1919         cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1920 
1921         /*
1922          * We must release the write lock here because
1923          * the workqueue job (flush_async_commit) needs this lock
1924          */
1925         reiserfs_write_unlock(sb);
1926 
1927         cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
1928         flush_workqueue(commit_wq);
1929 
1930         if (!reiserfs_mounted_fs_count) {
1931                 destroy_workqueue(commit_wq);
1932                 commit_wq = NULL;
1933         }
1934 
1935         free_journal_ram(sb);
1936 
1937         reiserfs_write_lock(sb);
1938 
1939         return 0;
1940 }
1941 
1942 /*
1943 ** call on unmount.  flush all journal trans, release all alloc'd ram
1944 */
1945 int journal_release(struct reiserfs_transaction_handle *th,
1946                     struct super_block *sb)
1947 {
1948         return do_journal_release(th, sb, 0);
1949 }
1950 
1951 /*
1952 ** only call from an error condition inside reiserfs_read_super!
1953 */
1954 int journal_release_error(struct reiserfs_transaction_handle *th,
1955                           struct super_block *sb)
1956 {
1957         return do_journal_release(th, sb, 1);
1958 }
1959 
1960 /* compares description block with commit block.  returns 1 if they differ, 0 if they are the same */
1961 static int journal_compare_desc_commit(struct super_block *sb,
1962                                        struct reiserfs_journal_desc *desc,
1963                                        struct reiserfs_journal_commit *commit)
1964 {
1965         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1966             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1967             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1968             get_commit_trans_len(commit) <= 0) {
1969                 return 1;
1970         }
1971         return 0;
1972 }
1973 
1974 /* returns 0 if it did not find a description block
1975 ** returns -1 if it found a corrupt commit block
1976 ** returns 1 if both desc and commit were valid
1977 */
1978 static int journal_transaction_is_valid(struct super_block *sb,
1979                                         struct buffer_head *d_bh,
1980                                         unsigned int *oldest_invalid_trans_id,
1981                                         unsigned long *newest_mount_id)
1982 {
1983         struct reiserfs_journal_desc *desc;
1984         struct reiserfs_journal_commit *commit;
1985         struct buffer_head *c_bh;
1986         unsigned long offset;
1987 
1988         if (!d_bh)
1989                 return 0;
1990 
1991         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1992         if (get_desc_trans_len(desc) > 0
1993             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1994                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1995                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1996                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
1997                                        "journal-986: transaction "
1998                                        "is valid returning because trans_id %d is greater than "
1999                                        "oldest_invalid %lu",
2000                                        get_desc_trans_id(desc),
2001                                        *oldest_invalid_trans_id);
2002                         return 0;
2003                 }
2004                 if (newest_mount_id
2005                     && *newest_mount_id > get_desc_mount_id(desc)) {
2006                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2007                                        "journal-1087: transaction "
2008                                        "is valid returning because mount_id %d is less than "
2009                                        "newest_mount_id %lu",
2010                                        get_desc_mount_id(desc),
2011                                        *newest_mount_id);
2012                         return -1;
2013                 }
2014                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2015                         reiserfs_warning(sb, "journal-2018",
2016                                          "Bad transaction length %d "
2017                                          "encountered, ignoring transaction",
2018                                          get_desc_trans_len(desc));
2019                         return -1;
2020                 }
2021                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2022 
2023                 /* ok, we have a journal description block, lets see if the transaction was valid */
2024                 c_bh =
2025                     journal_bread(sb,
2026                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2027                                   ((offset + get_desc_trans_len(desc) +
2028                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2029                 if (!c_bh)
2030                         return 0;
2031                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2032                 if (journal_compare_desc_commit(sb, desc, commit)) {
2033                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2034                                        "journal_transaction_is_valid, commit offset %ld had bad "
2035                                        "time %d or length %d",
2036                                        c_bh->b_blocknr -
2037                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2038                                        get_commit_trans_id(commit),
2039                                        get_commit_trans_len(commit));
2040                         brelse(c_bh);
2041                         if (oldest_invalid_trans_id) {
2042                                 *oldest_invalid_trans_id =
2043                                     get_desc_trans_id(desc);
2044                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2045                                                "journal-1004: "
2046                                                "transaction_is_valid setting oldest invalid trans_id "
2047                                                "to %d",
2048                                                get_desc_trans_id(desc));
2049                         }
2050                         return -1;
2051                 }
2052                 brelse(c_bh);
2053                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2054                                "journal-1006: found valid "
2055                                "transaction start offset %llu, len %d id %d",
2056                                d_bh->b_blocknr -
2057                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2058                                get_desc_trans_len(desc),
2059                                get_desc_trans_id(desc));
2060                 return 1;
2061         } else {
2062                 return 0;
2063         }
2064 }
2065 
2066 static void brelse_array(struct buffer_head **heads, int num)
2067 {
2068         int i;
2069         for (i = 0; i < num; i++) {
2070                 brelse(heads[i]);
2071         }
2072 }
2073 
2074 /*
2075 ** given the start, and values for the oldest acceptable transactions,
2076 ** this either reads in a replays a transaction, or returns because the transaction
2077 ** is invalid, or too old.
2078 */
2079 static int journal_read_transaction(struct super_block *sb,
2080                                     unsigned long cur_dblock,
2081                                     unsigned long oldest_start,
2082                                     unsigned int oldest_trans_id,
2083                                     unsigned long newest_mount_id)
2084 {
2085         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2086         struct reiserfs_journal_desc *desc;
2087         struct reiserfs_journal_commit *commit;
2088         unsigned int trans_id = 0;
2089         struct buffer_head *c_bh;
2090         struct buffer_head *d_bh;
2091         struct buffer_head **log_blocks = NULL;
2092         struct buffer_head **real_blocks = NULL;
2093         unsigned int trans_offset;
2094         int i;
2095         int trans_half;
2096 
2097         d_bh = journal_bread(sb, cur_dblock);
2098         if (!d_bh)
2099                 return 1;
2100         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2101         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2102         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2103                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2104                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2105                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2106         if (get_desc_trans_id(desc) < oldest_trans_id) {
2107                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2108                                "journal_read_trans skipping because %lu is too old",
2109                                cur_dblock -
2110                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2111                 brelse(d_bh);
2112                 return 1;
2113         }
2114         if (get_desc_mount_id(desc) != newest_mount_id) {
2115                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2116                                "journal_read_trans skipping because %d is != "
2117                                "newest_mount_id %lu", get_desc_mount_id(desc),
2118                                newest_mount_id);
2119                 brelse(d_bh);
2120                 return 1;
2121         }
2122         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2123                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2124                               SB_ONDISK_JOURNAL_SIZE(sb)));
2125         if (!c_bh) {
2126                 brelse(d_bh);
2127                 return 1;
2128         }
2129         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2130         if (journal_compare_desc_commit(sb, desc, commit)) {
2131                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2132                                "journal_read_transaction, "
2133                                "commit offset %llu had bad time %d or length %d",
2134                                c_bh->b_blocknr -
2135                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2136                                get_commit_trans_id(commit),
2137                                get_commit_trans_len(commit));
2138                 brelse(c_bh);
2139                 brelse(d_bh);
2140                 return 1;
2141         }
2142 
2143         if (bdev_read_only(sb->s_bdev)) {
2144                 reiserfs_warning(sb, "clm-2076",
2145                                  "device is readonly, unable to replay log");
2146                 brelse(c_bh);
2147                 brelse(d_bh);
2148                 return -EROFS;
2149         }
2150 
2151         trans_id = get_desc_trans_id(desc);
2152         /* now we know we've got a good transaction, and it was inside the valid time ranges */
2153         log_blocks = kmalloc(get_desc_trans_len(desc) *
2154                              sizeof(struct buffer_head *), GFP_NOFS);
2155         real_blocks = kmalloc(get_desc_trans_len(desc) *
2156                               sizeof(struct buffer_head *), GFP_NOFS);
2157         if (!log_blocks || !real_blocks) {
2158                 brelse(c_bh);
2159                 brelse(d_bh);
2160                 kfree(log_blocks);
2161                 kfree(real_blocks);
2162                 reiserfs_warning(sb, "journal-1169",
2163                                  "kmalloc failed, unable to mount FS");
2164                 return -1;
2165         }
2166         /* get all the buffer heads */
2167         trans_half = journal_trans_half(sb->s_blocksize);
2168         for (i = 0; i < get_desc_trans_len(desc); i++) {
2169                 log_blocks[i] =
2170                     journal_getblk(sb,
2171                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2172                                    (trans_offset + 1 +
2173                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2174                 if (i < trans_half) {
2175                         real_blocks[i] =
2176                             sb_getblk(sb,
2177                                       le32_to_cpu(desc->j_realblock[i]));
2178                 } else {
2179                         real_blocks[i] =
2180                             sb_getblk(sb,
2181                                       le32_to_cpu(commit->
2182                                                   j_realblock[i - trans_half]));
2183                 }
2184                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2185                         reiserfs_warning(sb, "journal-1207",
2186                                          "REPLAY FAILURE fsck required! "
2187                                          "Block to replay is outside of "
2188                                          "filesystem");
2189                         goto abort_replay;
2190                 }
2191                 /* make sure we don't try to replay onto log or reserved area */
2192                 if (is_block_in_log_or_reserved_area
2193                     (sb, real_blocks[i]->b_blocknr)) {
2194                         reiserfs_warning(sb, "journal-1204",
2195                                          "REPLAY FAILURE fsck required! "
2196                                          "Trying to replay onto a log block");
2197                       abort_replay:
2198                         brelse_array(log_blocks, i);
2199                         brelse_array(real_blocks, i);
2200                         brelse(c_bh);
2201                         brelse(d_bh);
2202                         kfree(log_blocks);
2203                         kfree(real_blocks);
2204                         return -1;
2205                 }
2206         }
2207         /* read in the log blocks, memcpy to the corresponding real block */
2208         ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2209         for (i = 0; i < get_desc_trans_len(desc); i++) {
2210 
2211                 reiserfs_write_unlock(sb);
2212                 wait_on_buffer(log_blocks[i]);
2213                 reiserfs_write_lock(sb);
2214 
2215                 if (!buffer_uptodate(log_blocks[i])) {
2216                         reiserfs_warning(sb, "journal-1212",
2217                                          "REPLAY FAILURE fsck required! "
2218                                          "buffer write failed");
2219                         brelse_array(log_blocks + i,
2220                                      get_desc_trans_len(desc) - i);
2221                         brelse_array(real_blocks, get_desc_trans_len(desc));
2222                         brelse(c_bh);
2223                         brelse(d_bh);
2224                         kfree(log_blocks);
2225                         kfree(real_blocks);
2226                         return -1;
2227                 }
2228                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2229                        real_blocks[i]->b_size);
2230                 set_buffer_uptodate(real_blocks[i]);
2231                 brelse(log_blocks[i]);
2232         }
2233         /* flush out the real blocks */
2234         for (i = 0; i < get_desc_trans_len(desc); i++) {
2235                 set_buffer_dirty(real_blocks[i]);
2236                 write_dirty_buffer(real_blocks[i], WRITE);
2237         }
2238         for (i = 0; i < get_desc_trans_len(desc); i++) {
2239                 wait_on_buffer(real_blocks[i]);
2240                 if (!buffer_uptodate(real_blocks[i])) {
2241                         reiserfs_warning(sb, "journal-1226",
2242                                          "REPLAY FAILURE, fsck required! "
2243                                          "buffer write failed");
2244                         brelse_array(real_blocks + i,
2245                                      get_desc_trans_len(desc) - i);
2246                         brelse(c_bh);
2247                         brelse(d_bh);
2248                         kfree(log_blocks);
2249                         kfree(real_blocks);
2250                         return -1;
2251                 }
2252                 brelse(real_blocks[i]);
2253         }
2254         cur_dblock =
2255             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2256             ((trans_offset + get_desc_trans_len(desc) +
2257               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2258         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2259                        "journal-1095: setting journal " "start to offset %ld",
2260                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2261 
2262         /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2263         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2264         journal->j_last_flush_trans_id = trans_id;
2265         journal->j_trans_id = trans_id + 1;
2266         /* check for trans_id overflow */
2267         if (journal->j_trans_id == 0)
2268                 journal->j_trans_id = 10;
2269         brelse(c_bh);
2270         brelse(d_bh);
2271         kfree(log_blocks);
2272         kfree(real_blocks);
2273         return 0;
2274 }
2275 
2276 /* This function reads blocks starting from block and to max_block of bufsize
2277    size (but no more than BUFNR blocks at a time). This proved to improve
2278    mounting speed on self-rebuilding raid5 arrays at least.
2279    Right now it is only used from journal code. But later we might use it
2280    from other places.
2281    Note: Do not use journal_getblk/sb_getblk functions here! */
2282 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2283                                            b_blocknr_t block, int bufsize,
2284                                            b_blocknr_t max_block)
2285 {
2286         struct buffer_head *bhlist[BUFNR];
2287         unsigned int blocks = BUFNR;
2288         struct buffer_head *bh;
2289         int i, j;
2290 
2291         bh = __getblk(dev, block, bufsize);
2292         if (buffer_uptodate(bh))
2293                 return (bh);
2294 
2295         if (block + BUFNR > max_block) {
2296                 blocks = max_block - block;
2297         }
2298         bhlist[0] = bh;
2299         j = 1;
2300         for (i = 1; i < blocks; i++) {
2301                 bh = __getblk(dev, block + i, bufsize);
2302                 if (buffer_uptodate(bh)) {
2303                         brelse(bh);
2304                         break;
2305                 } else
2306                         bhlist[j++] = bh;
2307         }
2308         ll_rw_block(READ, j, bhlist);
2309         for (i = 1; i < j; i++)
2310                 brelse(bhlist[i]);
2311         bh = bhlist[0];
2312         wait_on_buffer(bh);
2313         if (buffer_uptodate(bh))
2314                 return bh;
2315         brelse(bh);
2316         return NULL;
2317 }
2318 
2319 /*
2320 ** read and replay the log
2321 ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2322 ** transaction.  This tests that before finding all the transactions in the log, which makes normal mount times fast.
2323 **
2324 ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2325 **
2326 ** On exit, it sets things up so the first transaction will work correctly.
2327 */
2328 static int journal_read(struct super_block *sb)
2329 {
2330         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2331         struct reiserfs_journal_desc *desc;
2332         unsigned int oldest_trans_id = 0;
2333         unsigned int oldest_invalid_trans_id = 0;
2334         time_t start;
2335         unsigned long oldest_start = 0;
2336         unsigned long cur_dblock = 0;
2337         unsigned long newest_mount_id = 9;
2338         struct buffer_head *d_bh;
2339         struct reiserfs_journal_header *jh;
2340         int valid_journal_header = 0;
2341         int replay_count = 0;
2342         int continue_replay = 1;
2343         int ret;
2344         char b[BDEVNAME_SIZE];
2345 
2346         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2347         reiserfs_info(sb, "checking transaction log (%s)\n",
2348                       bdevname(journal->j_dev_bd, b));
2349         start = get_seconds();
2350 
2351         /* step 1, read in the journal header block.  Check the transaction it says
2352          ** is the first unflushed, and if that transaction is not valid,
2353          ** replay is done
2354          */
2355         journal->j_header_bh = journal_bread(sb,
2356                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2357                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2358         if (!journal->j_header_bh) {
2359                 return 1;
2360         }
2361         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2362         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2363             SB_ONDISK_JOURNAL_SIZE(sb)
2364             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2365                 oldest_start =
2366                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2367                     le32_to_cpu(jh->j_first_unflushed_offset);
2368                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2369                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2370                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2371                                "journal-1153: found in "
2372                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2373                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2374                                le32_to_cpu(jh->j_last_flush_trans_id));
2375                 valid_journal_header = 1;
2376 
2377                 /* now, we try to read the first unflushed offset.  If it is not valid,
2378                  ** there is nothing more we can do, and it makes no sense to read
2379                  ** through the whole log.
2380                  */
2381                 d_bh =
2382                     journal_bread(sb,
2383                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2384                                   le32_to_cpu(jh->j_first_unflushed_offset));
2385                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2386                 if (!ret) {
2387                         continue_replay = 0;
2388                 }
2389                 brelse(d_bh);
2390                 goto start_log_replay;
2391         }
2392 
2393         /* ok, there are transactions that need to be replayed.  start with the first log block, find
2394          ** all the valid transactions, and pick out the oldest.
2395          */
2396         while (continue_replay
2397                && cur_dblock <
2398                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2399                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2400                 /* Note that it is required for blocksize of primary fs device and journal
2401                    device to be the same */
2402                 d_bh =
2403                     reiserfs_breada(journal->j_dev_bd, cur_dblock,
2404                                     sb->s_blocksize,
2405                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2406                                     SB_ONDISK_JOURNAL_SIZE(sb));
2407                 ret =
2408                     journal_transaction_is_valid(sb, d_bh,
2409                                                  &oldest_invalid_trans_id,
2410                                                  &newest_mount_id);
2411                 if (ret == 1) {
2412                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2413                         if (oldest_start == 0) {        /* init all oldest_ values */
2414                                 oldest_trans_id = get_desc_trans_id(desc);
2415                                 oldest_start = d_bh->b_blocknr;
2416                                 newest_mount_id = get_desc_mount_id(desc);
2417                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2418                                                "journal-1179: Setting "
2419                                                "oldest_start to offset %llu, trans_id %lu",
2420                                                oldest_start -
2421                                                SB_ONDISK_JOURNAL_1st_BLOCK
2422                                                (sb), oldest_trans_id);
2423                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2424                                 /* one we just read was older */
2425                                 oldest_trans_id = get_desc_trans_id(desc);
2426                                 oldest_start = d_bh->b_blocknr;
2427                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2428                                                "journal-1180: Resetting "
2429                                                "oldest_start to offset %lu, trans_id %lu",
2430                                                oldest_start -
2431                                                SB_ONDISK_JOURNAL_1st_BLOCK
2432                                                (sb), oldest_trans_id);
2433                         }
2434                         if (newest_mount_id < get_desc_mount_id(desc)) {
2435                                 newest_mount_id = get_desc_mount_id(desc);
2436                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2437                                                "journal-1299: Setting "
2438                                                "newest_mount_id to %d",
2439                                                get_desc_mount_id(desc));
2440                         }
2441                         cur_dblock += get_desc_trans_len(desc) + 2;
2442                 } else {
2443                         cur_dblock++;
2444                 }
2445                 brelse(d_bh);
2446         }
2447 
2448       start_log_replay:
2449         cur_dblock = oldest_start;
2450         if (oldest_trans_id) {
2451                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2452                                "journal-1206: Starting replay "
2453                                "from offset %llu, trans_id %lu",
2454                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2455                                oldest_trans_id);
2456 
2457         }
2458         replay_count = 0;
2459         while (continue_replay && oldest_trans_id > 0) {
2460                 ret =
2461                     journal_read_transaction(sb, cur_dblock, oldest_start,
2462                                              oldest_trans_id, newest_mount_id);
2463                 if (ret < 0) {
2464                         return ret;
2465                 } else if (ret != 0) {
2466                         break;
2467                 }
2468                 cur_dblock =
2469                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2470                 replay_count++;
2471                 if (cur_dblock == oldest_start)
2472                         break;
2473         }
2474 
2475         if (oldest_trans_id == 0) {
2476                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2477                                "journal-1225: No valid " "transactions found");
2478         }
2479         /* j_start does not get set correctly if we don't replay any transactions.
2480          ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2481          ** copy the trans_id from the header
2482          */
2483         if (valid_journal_header && replay_count == 0) {
2484                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2485                 journal->j_trans_id =
2486                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2487                 /* check for trans_id overflow */
2488                 if (journal->j_trans_id == 0)
2489                         journal->j_trans_id = 10;
2490                 journal->j_last_flush_trans_id =
2491                     le32_to_cpu(jh->j_last_flush_trans_id);
2492                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2493         } else {
2494                 journal->j_mount_id = newest_mount_id + 1;
2495         }
2496         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2497                        "newest_mount_id to %lu", journal->j_mount_id);
2498         journal->j_first_unflushed_offset = journal->j_start;
2499         if (replay_count > 0) {
2500                 reiserfs_info(sb,
2501                               "replayed %d transactions in %lu seconds\n",
2502                               replay_count, get_seconds() - start);
2503         }
2504         if (!bdev_read_only(sb->s_bdev) &&
2505             _update_journal_header_block(sb, journal->j_start,
2506                                          journal->j_last_flush_trans_id)) {
2507                 /* replay failed, caller must call free_journal_ram and abort
2508                  ** the mount
2509                  */
2510                 return -1;
2511         }
2512         return 0;
2513 }
2514 
2515 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2516 {
2517         struct reiserfs_journal_list *jl;
2518         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2519                      GFP_NOFS | __GFP_NOFAIL);
2520         INIT_LIST_HEAD(&jl->j_list);
2521         INIT_LIST_HEAD(&jl->j_working_list);
2522         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2523         INIT_LIST_HEAD(&jl->j_bh_list);
2524         mutex_init(&jl->j_commit_mutex);
2525         SB_JOURNAL(s)->j_num_lists++;
2526         get_journal_list(jl);
2527         return jl;
2528 }
2529 
2530 static void journal_list_init(struct super_block *sb)
2531 {
2532         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2533 }
2534 
2535 static int release_journal_dev(struct super_block *super,
2536                                struct reiserfs_journal *journal)
2537 {
2538         int result;
2539 
2540         result = 0;
2541 
2542         if (journal->j_dev_bd != NULL) {
2543                 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2544                 journal->j_dev_bd = NULL;
2545         }
2546 
2547         if (result != 0) {
2548                 reiserfs_warning(super, "sh-457",
2549                                  "Cannot release journal device: %i", result);
2550         }
2551         return result;
2552 }
2553 
2554 static int journal_init_dev(struct super_block *super,
2555                             struct reiserfs_journal *journal,
2556                             const char *jdev_name)
2557 {
2558         int result;
2559         dev_t jdev;
2560         fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2561         char b[BDEVNAME_SIZE];
2562 
2563         result = 0;
2564 
2565         journal->j_dev_bd = NULL;
2566         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2567             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2568 
2569         if (bdev_read_only(super->s_bdev))
2570                 blkdev_mode = FMODE_READ;
2571 
2572         /* there is no "jdev" option and journal is on separate device */
2573         if ((!jdev_name || !jdev_name[0])) {
2574                 if (jdev == super->s_dev)
2575                         blkdev_mode &= ~FMODE_EXCL;
2576                 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2577                                                       journal);
2578                 journal->j_dev_mode = blkdev_mode;
2579                 if (IS_ERR(journal->j_dev_bd)) {
2580                         result = PTR_ERR(journal->j_dev_bd);
2581                         journal->j_dev_bd = NULL;
2582                         reiserfs_warning(super, "sh-458",
2583                                          "cannot init journal device '%s': %i",
2584                                          __bdevname(jdev, b), result);
2585                         return result;
2586                 } else if (jdev != super->s_dev)
2587                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2588 
2589                 return 0;
2590         }
2591 
2592         journal->j_dev_mode = blkdev_mode;
2593         journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2594         if (IS_ERR(journal->j_dev_bd)) {
2595                 result = PTR_ERR(journal->j_dev_bd);
2596                 journal->j_dev_bd = NULL;
2597                 reiserfs_warning(super,
2598                                  "journal_init_dev: Cannot open '%s': %i",
2599                                  jdev_name, result);
2600                 return result;
2601         }
2602 
2603         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2604         reiserfs_info(super,
2605                       "journal_init_dev: journal device: %s\n",
2606                       bdevname(journal->j_dev_bd, b));
2607         return 0;
2608 }
2609 
2610 /**
2611  * When creating/tuning a file system user can assign some
2612  * journal params within boundaries which depend on the ratio
2613  * blocksize/standard_blocksize.
2614  *
2615  * For blocks >= standard_blocksize transaction size should
2616  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2617  * then JOURNAL_TRANS_MAX_DEFAULT.
2618  *
2619  * For blocks < standard_blocksize these boundaries should be
2620  * decreased proportionally.
2621  */
2622 #define REISERFS_STANDARD_BLKSIZE (4096)
2623 
2624 static int check_advise_trans_params(struct super_block *sb,
2625                                      struct reiserfs_journal *journal)
2626 {
2627         if (journal->j_trans_max) {
2628                 /* Non-default journal params.
2629                    Do sanity check for them. */
2630                 int ratio = 1;
2631                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2632                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2633 
2634                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2635                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2636                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2637                     JOURNAL_MIN_RATIO) {
2638                         reiserfs_warning(sb, "sh-462",
2639                                          "bad transaction max size (%u). "
2640                                          "FSCK?", journal->j_trans_max);
2641                         return 1;
2642                 }
2643                 if (journal->j_max_batch != (journal->j_trans_max) *
2644                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2645                         reiserfs_warning(sb, "sh-463",
2646                                          "bad transaction max batch (%u). "
2647                                          "FSCK?", journal->j_max_batch);
2648                         return 1;
2649                 }
2650         } else {
2651                 /* Default journal params.
2652                    The file system was created by old version
2653                    of mkreiserfs, so some fields contain zeros,
2654                    and we need to advise proper values for them */
2655                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2656                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2657                                          sb->s_blocksize);
2658                         return 1;
2659                 }
2660                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2661                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2662                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2663         }
2664         return 0;
2665 }
2666 
2667 /*
2668 ** must be called once on fs mount.  calls journal_read for you
2669 */
2670 int journal_init(struct super_block *sb, const char *j_dev_name,
2671                  int old_format, unsigned int commit_max_age)
2672 {
2673         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2674         struct buffer_head *bhjh;
2675         struct reiserfs_super_block *rs;
2676         struct reiserfs_journal_header *jh;
2677         struct reiserfs_journal *journal;
2678         struct reiserfs_journal_list *jl;
2679         char b[BDEVNAME_SIZE];
2680         int ret;
2681 
2682         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2683         if (!journal) {
2684                 reiserfs_warning(sb, "journal-1256",
2685                                  "unable to get memory for journal structure");
2686                 return 1;
2687         }
2688         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2689         INIT_LIST_HEAD(&journal->j_prealloc_list);
2690         INIT_LIST_HEAD(&journal->j_working_list);
2691         INIT_LIST_HEAD(&journal->j_journal_list);
2692         journal->j_persistent_trans = 0;
2693         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2694                                            reiserfs_bmap_count(sb)))
2695                 goto free_and_return;
2696 
2697         allocate_bitmap_nodes(sb);
2698 
2699         /* reserved for journal area support */
2700         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2701                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2702                                                  / sb->s_blocksize +
2703                                                  reiserfs_bmap_count(sb) +
2704                                                  1 :
2705                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2706                                                  sb->s_blocksize + 2);
2707 
2708         /* Sanity check to see is the standard journal fitting within first bitmap
2709            (actual for small blocksizes) */
2710         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2711             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2712              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2713                 reiserfs_warning(sb, "journal-1393",
2714                                  "journal does not fit for area addressed "
2715                                  "by first of bitmap blocks. It starts at "
2716                                  "%u and its size is %u. Block size %ld",
2717                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2718                                  SB_ONDISK_JOURNAL_SIZE(sb),
2719                                  sb->s_blocksize);
2720                 goto free_and_return;
2721         }
2722 
2723         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2724                 reiserfs_warning(sb, "sh-462",
2725                                  "unable to initialize jornal device");
2726                 goto free_and_return;
2727         }
2728 
2729         rs = SB_DISK_SUPER_BLOCK(sb);
2730 
2731         /* read journal header */
2732         bhjh = journal_bread(sb,
2733                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2734                              SB_ONDISK_JOURNAL_SIZE(sb));
2735         if (!bhjh) {
2736                 reiserfs_warning(sb, "sh-459",
2737                                  "unable to read journal header");
2738                 goto free_and_return;
2739         }
2740         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2741 
2742         /* make sure that journal matches to the super block */
2743         if (is_reiserfs_jr(rs)
2744             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2745                 sb_jp_journal_magic(rs))) {
2746                 reiserfs_warning(sb, "sh-460",
2747                                  "journal header magic %x (device %s) does "
2748                                  "not match to magic found in super block %x",
2749                                  jh->jh_journal.jp_journal_magic,
2750                                  bdevname(journal->j_dev_bd, b),
2751                                  sb_jp_journal_magic(rs));
2752                 brelse(bhjh);
2753                 goto free_and_return;
2754         }
2755 
2756         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2757         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2758         journal->j_max_commit_age =
2759             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2760         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2761 
2762         if (check_advise_trans_params(sb, journal) != 0)
2763                 goto free_and_return;
2764         journal->j_default_max_commit_age = journal->j_max_commit_age;
2765 
2766         if (commit_max_age != 0) {
2767                 journal->j_max_commit_age = commit_max_age;
2768                 journal->j_max_trans_age = commit_max_age;
2769         }
2770 
2771         reiserfs_info(sb, "journal params: device %s, size %u, "
2772                       "journal first block %u, max trans len %u, max batch %u, "
2773                       "max commit age %u, max trans age %u\n",
2774                       bdevname(journal->j_dev_bd, b),
2775                       SB_ONDISK_JOURNAL_SIZE(sb),
2776                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2777                       journal->j_trans_max,
2778                       journal->j_max_batch,
2779                       journal->j_max_commit_age, journal->j_max_trans_age);
2780 
2781         brelse(bhjh);
2782 
2783         journal->j_list_bitmap_index = 0;
2784         journal_list_init(sb);
2785 
2786         memset(journal->j_list_hash_table, 0,
2787                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2788 
2789         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2790         spin_lock_init(&journal->j_dirty_buffers_lock);
2791 
2792         journal->j_start = 0;
2793         journal->j_len = 0;
2794         journal->j_len_alloc = 0;
2795         atomic_set(&(journal->j_wcount), 0);
2796         atomic_set(&(journal->j_async_throttle), 0);
2797         journal->j_bcount = 0;
2798         journal->j_trans_start_time = 0;
2799         journal->j_last = NULL;
2800         journal->j_first = NULL;
2801         init_waitqueue_head(&(journal->j_join_wait));
2802         mutex_init(&journal->j_mutex);
2803         mutex_init(&journal->j_flush_mutex);
2804 
2805         journal->j_trans_id = 10;
2806         journal->j_mount_id = 10;
2807         journal->j_state = 0;
2808         atomic_set(&(journal->j_jlock), 0);
2809         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2810         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2811         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2812         journal->j_cnode_used = 0;
2813         journal->j_must_wait = 0;
2814 
2815         if (journal->j_cnode_free == 0) {
2816                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2817                                  "allocation failed (%ld bytes). Journal is "
2818                                  "too large for available memory. Usually "
2819                                  "this is due to a journal that is too large.",
2820                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2821                 goto free_and_return;
2822         }
2823 
2824         init_journal_hash(sb);
2825         jl = journal->j_current_jl;
2826 
2827         /*
2828          * get_list_bitmap() may call flush_commit_list() which
2829          * requires the lock. Calling flush_commit_list() shouldn't happen
2830          * this early but I like to be paranoid.
2831          */
2832         reiserfs_write_lock(sb);
2833         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2834         reiserfs_write_unlock(sb);
2835         if (!jl->j_list_bitmap) {
2836                 reiserfs_warning(sb, "journal-2005",
2837                                  "get_list_bitmap failed for journal list 0");
2838                 goto free_and_return;
2839         }
2840 
2841         /*
2842          * Journal_read needs to be inspected in order to push down
2843          * the lock further inside (or even remove it).
2844          */
2845         reiserfs_write_lock(sb);
2846         ret = journal_read(sb);
2847         reiserfs_write_unlock(sb);
2848         if (ret < 0) {
2849                 reiserfs_warning(sb, "reiserfs-2006",
2850                                  "Replay Failure, unable to mount");
2851                 goto free_and_return;
2852         }
2853 
2854         reiserfs_mounted_fs_count++;
2855         if (reiserfs_mounted_fs_count <= 1)
2856                 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
2857 
2858         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2859         journal->j_work_sb = sb;
2860         return 0;
2861       free_and_return:
2862         free_journal_ram(sb);
2863         return 1;
2864 }
2865 
2866 /*
2867 ** test for a polite end of the current transaction.  Used by file_write, and should
2868 ** be used by delete to make sure they don't write more than can fit inside a single
2869 ** transaction
2870 */
2871 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2872                                    int new_alloc)
2873 {
2874         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2875         time_t now = get_seconds();
2876         /* cannot restart while nested */
2877         BUG_ON(!th->t_trans_id);
2878         if (th->t_refcount > 1)
2879                 return 0;
2880         if (journal->j_must_wait > 0 ||
2881             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2882             atomic_read(&(journal->j_jlock)) ||
2883             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2884             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2885                 return 1;
2886         }
2887 
2888         journal->j_len_alloc += new_alloc;
2889         th->t_blocks_allocated += new_alloc ;
2890         return 0;
2891 }
2892 
2893 /* this must be called inside a transaction
2894 */
2895 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2896 {
2897         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2898         BUG_ON(!th->t_trans_id);
2899         journal->j_must_wait = 1;
2900         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2901         return;
2902 }
2903 
2904 /* this must be called without a transaction started
2905 */
2906 void reiserfs_allow_writes(struct super_block *s)
2907 {
2908         struct reiserfs_journal *journal = SB_JOURNAL(s);
2909         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2910         wake_up(&journal->j_join_wait);
2911 }
2912 
2913 /* this must be called without a transaction started
2914 */
2915 void reiserfs_wait_on_write_block(struct super_block *s)
2916 {
2917         struct reiserfs_journal *journal = SB_JOURNAL(s);
2918         wait_event(journal->j_join_wait,
2919                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2920 }
2921 
2922 static void queue_log_writer(struct super_block *s)
2923 {
2924         wait_queue_t wait;
2925         struct reiserfs_journal *journal = SB_JOURNAL(s);
2926         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2927 
2928         /*
2929          * we don't want to use wait_event here because
2930          * we only want to wait once.
2931          */
2932         init_waitqueue_entry(&wait, current);
2933         add_wait_queue(&journal->j_join_wait, &wait);
2934         set_current_state(TASK_UNINTERRUPTIBLE);
2935         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2936                 reiserfs_write_unlock(s);
2937                 schedule();
2938                 reiserfs_write_lock(s);
2939         }
2940         __set_current_state(TASK_RUNNING);
2941         remove_wait_queue(&journal->j_join_wait, &wait);
2942 }
2943 
2944 static void wake_queued_writers(struct super_block *s)
2945 {
2946         struct reiserfs_journal *journal = SB_JOURNAL(s);
2947         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2948                 wake_up(&journal->j_join_wait);
2949 }
2950 
2951 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2952 {
2953         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2954         unsigned long bcount = journal->j_bcount;
2955         while (1) {
2956                 reiserfs_write_unlock(sb);
2957                 schedule_timeout_uninterruptible(1);
2958                 reiserfs_write_lock(sb);
2959                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2960                 while ((atomic_read(&journal->j_wcount) > 0 ||
2961                         atomic_read(&journal->j_jlock)) &&
2962                        journal->j_trans_id == trans_id) {
2963                         queue_log_writer(sb);
2964                 }
2965                 if (journal->j_trans_id != trans_id)
2966                         break;
2967                 if (bcount == journal->j_bcount)
2968                         break;
2969                 bcount = journal->j_bcount;
2970         }
2971 }
2972 
2973 /* join == true if you must join an existing transaction.
2974 ** join == false if you can deal with waiting for others to finish
2975 **
2976 ** this will block until the transaction is joinable.  send the number of blocks you
2977 ** expect to use in nblocks.
2978 */
2979 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2980                               struct super_block *sb, unsigned long nblocks,
2981                               int join)
2982 {
2983         time_t now = get_seconds();
2984         unsigned int old_trans_id;
2985         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2986         struct reiserfs_transaction_handle myth;
2987         int sched_count = 0;
2988         int retval;
2989 
2990         reiserfs_check_lock_depth(sb, "journal_begin");
2991         BUG_ON(nblocks > journal->j_trans_max);
2992 
2993         PROC_INFO_INC(sb, journal.journal_being);
2994         /* set here for journal_join */
2995         th->t_refcount = 1;
2996         th->t_super = sb;
2997 
2998       relock:
2999         lock_journal(sb);
3000         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3001                 unlock_journal(sb);
3002                 retval = journal->j_errno;
3003                 goto out_fail;
3004         }
3005         journal->j_bcount++;
3006 
3007         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3008                 unlock_journal(sb);
3009                 reiserfs_write_unlock(sb);
3010                 reiserfs_wait_on_write_block(sb);
3011                 reiserfs_write_lock(sb);
3012                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3013                 goto relock;
3014         }
3015         now = get_seconds();
3016 
3017         /* if there is no room in the journal OR
3018          ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3019          ** we don't sleep if there aren't other writers
3020          */
3021 
3022         if ((!join && journal->j_must_wait > 0) ||
3023             (!join
3024              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3025             || (!join && atomic_read(&journal->j_wcount) > 0
3026                 && journal->j_trans_start_time > 0
3027                 && (now - journal->j_trans_start_time) >
3028                 journal->j_max_trans_age) || (!join
3029                                               && atomic_read(&journal->j_jlock))
3030             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3031 
3032                 old_trans_id = journal->j_trans_id;
3033                 unlock_journal(sb);     /* allow others to finish this transaction */
3034 
3035                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3036                     journal->j_max_batch &&
3037                     ((journal->j_len + nblocks + 2) * 100) <
3038                     (journal->j_len_alloc * 75)) {
3039                         if (atomic_read(&journal->j_wcount) > 10) {
3040                                 sched_count++;
3041                                 queue_log_writer(sb);
3042                                 goto relock;
3043                         }
3044                 }
3045                 /* don't mess with joining the transaction if all we have to do is
3046                  * wait for someone else to do a commit
3047                  */
3048                 if (atomic_read(&journal->j_jlock)) {
3049                         while (journal->j_trans_id == old_trans_id &&
3050                                atomic_read(&journal->j_jlock)) {
3051                                 queue_log_writer(sb);
3052                         }
3053                         goto relock;
3054                 }
3055                 retval = journal_join(&myth, sb, 1);
3056                 if (retval)
3057                         goto out_fail;
3058 
3059                 /* someone might have ended the transaction while we joined */
3060                 if (old_trans_id != journal->j_trans_id) {
3061                         retval = do_journal_end(&myth, sb, 1, 0);
3062                 } else {
3063                         retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
3064                 }
3065 
3066                 if (retval)
3067                         goto out_fail;
3068 
3069                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3070                 goto relock;
3071         }
3072         /* we are the first writer, set trans_id */
3073         if (journal->j_trans_start_time == 0) {
3074                 journal->j_trans_start_time = get_seconds();
3075         }
3076         atomic_inc(&(journal->j_wcount));
3077         journal->j_len_alloc += nblocks;
3078         th->t_blocks_logged = 0;
3079         th->t_blocks_allocated = nblocks;
3080         th->t_trans_id = journal->j_trans_id;
3081         unlock_journal(sb);
3082         INIT_LIST_HEAD(&th->t_list);
3083         return 0;
3084 
3085       out_fail:
3086         memset(th, 0, sizeof(*th));
3087         /* Re-set th->t_super, so we can properly keep track of how many
3088          * persistent transactions there are. We need to do this so if this
3089          * call is part of a failed restart_transaction, we can free it later */
3090         th->t_super = sb;
3091         return retval;
3092 }
3093 
3094 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3095                                                                     super_block
3096                                                                     *s,
3097                                                                     int nblocks)
3098 {
3099         int ret;
3100         struct reiserfs_transaction_handle *th;
3101 
3102         /* if we're nesting into an existing transaction.  It will be
3103          ** persistent on its own
3104          */
3105         if (reiserfs_transaction_running(s)) {
3106                 th = current->journal_info;
3107                 th->t_refcount++;
3108                 BUG_ON(th->t_refcount < 2);
3109                 
3110                 return th;
3111         }
3112         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3113         if (!th)
3114                 return NULL;
3115         ret = journal_begin(th, s, nblocks);
3116         if (ret) {
3117                 kfree(th);
3118                 return NULL;
3119         }
3120 
3121         SB_JOURNAL(s)->j_persistent_trans++;
3122         return th;
3123 }
3124 
3125 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3126 {
3127         struct super_block *s = th->t_super;
3128         int ret = 0;
3129         if (th->t_trans_id)
3130                 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3131         else
3132                 ret = -EIO;
3133         if (th->t_refcount == 0) {
3134                 SB_JOURNAL(s)->j_persistent_trans--;
3135                 kfree(th);
3136         }
3137         return ret;
3138 }
3139 
3140 static int journal_join(struct reiserfs_transaction_handle *th,
3141                         struct super_block *sb, unsigned long nblocks)
3142 {
3143         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3144 
3145         /* this keeps do_journal_end from NULLing out the current->journal_info
3146          ** pointer
3147          */
3148         th->t_handle_save = cur_th;
3149         BUG_ON(cur_th && cur_th->t_refcount > 1);
3150         return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
3151 }
3152 
3153 int journal_join_abort(struct reiserfs_transaction_handle *th,
3154                        struct super_block *sb, unsigned long nblocks)
3155 {
3156         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3157 
3158         /* this keeps do_journal_end from NULLing out the current->journal_info
3159          ** pointer
3160          */
3161         th->t_handle_save = cur_th;
3162         BUG_ON(cur_th && cur_th->t_refcount > 1);
3163         return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
3164 }
3165 
3166 int journal_begin(struct reiserfs_transaction_handle *th,
3167                   struct super_block *sb, unsigned long nblocks)
3168 {
3169         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3170         int ret;
3171 
3172         th->t_handle_save = NULL;
3173         if (cur_th) {
3174                 /* we are nesting into the current transaction */
3175                 if (cur_th->t_super == sb) {
3176                         BUG_ON(!cur_th->t_refcount);
3177                         cur_th->t_refcount++;
3178                         memcpy(th, cur_th, sizeof(*th));
3179                         if (th->t_refcount <= 1)
3180                                 reiserfs_warning(sb, "reiserfs-2005",
3181                                                  "BAD: refcount <= 1, but "
3182                                                  "journal_info != 0");
3183                         return 0;
3184                 } else {
3185                         /* we've ended up with a handle from a different filesystem.
3186                          ** save it and restore on journal_end.  This should never
3187                          ** really happen...
3188                          */
3189                         reiserfs_warning(sb, "clm-2100",
3190                                          "nesting info a different FS");
3191                         th->t_handle_save = current->journal_info;
3192                         current->journal_info = th;
3193                 }
3194         } else {
3195                 current->journal_info = th;
3196         }
3197         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3198         BUG_ON(current->journal_info != th);
3199 
3200         /* I guess this boils down to being the reciprocal of clm-2100 above.
3201          * If do_journal_begin_r fails, we need to put it back, since journal_end
3202          * won't be called to do it. */
3203         if (ret)
3204                 current->journal_info = th->t_handle_save;
3205         else
3206                 BUG_ON(!th->t_refcount);
3207 
3208         return ret;
3209 }
3210 
3211 /*
3212 ** puts bh into the current transaction.  If it was already there, reorders removes the
3213 ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3214 **
3215 ** if it was dirty, cleans and files onto the clean list.  I can't let it be dirty again until the
3216 ** transaction is committed.
3217 **
3218 ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3219 */
3220 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3221                        struct super_block *sb, struct buffer_head *bh)
3222 {
3223         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3224         struct reiserfs_journal_cnode *cn = NULL;
3225         int count_already_incd = 0;
3226         int prepared = 0;
3227         BUG_ON(!th->t_trans_id);
3228 
3229         PROC_INFO_INC(sb, journal.mark_dirty);
3230         if (th->t_trans_id != journal->j_trans_id) {
3231                 reiserfs_panic(th->t_super, "journal-1577",
3232                                "handle trans id %ld != current trans id %ld",
3233                                th->t_trans_id, journal->j_trans_id);
3234         }
3235 
3236         prepared = test_clear_buffer_journal_prepared(bh);
3237         clear_buffer_journal_restore_dirty(bh);
3238         /* already in this transaction, we are done */
3239         if (buffer_journaled(bh)) {
3240                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3241                 return 0;
3242         }
3243 
3244         /* this must be turned into a panic instead of a warning.  We can't allow
3245          ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3246          ** could get to disk too early.  NOT GOOD.
3247          */
3248         if (!prepared || buffer_dirty(bh)) {
3249                 reiserfs_warning(sb, "journal-1777",
3250                                  "buffer %llu bad state "
3251                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3252                                  (unsigned long long)bh->b_blocknr,
3253                                  prepared ? ' ' : '!',
3254                                  buffer_locked(bh) ? ' ' : '!',
3255                                  buffer_dirty(bh) ? ' ' : '!',
3256                                  buffer_journal_dirty(bh) ? ' ' : '!');
3257         }
3258 
3259         if (atomic_read(&(journal->j_wcount)) <= 0) {
3260                 reiserfs_warning(sb, "journal-1409",
3261                                  "returning because j_wcount was %d",
3262                                  atomic_read(&(journal->j_wcount)));
3263                 return 1;
3264         }
3265         /* this error means I've screwed up, and we've overflowed the transaction.
3266          ** Nothing can be done here, except make the FS readonly or panic.
3267          */
3268         if (journal->j_len >= journal->j_trans_max) {
3269                 reiserfs_panic(th->t_super, "journal-1413",
3270                                "j_len (%lu) is too big",
3271                                journal->j_len);
3272         }
3273 
3274         if (buffer_journal_dirty(bh)) {
3275                 count_already_incd = 1;
3276                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3277                 clear_buffer_journal_dirty(bh);
3278         }
3279 
3280         if (journal->j_len > journal->j_len_alloc) {
3281                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3282         }
3283 
3284         set_buffer_journaled(bh);
3285 
3286         /* now put this guy on the end */
3287         if (!cn) {
3288                 cn = get_cnode(sb);
3289                 if (!cn) {
3290                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3291                 }
3292 
3293                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3294                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3295                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3296                 }
3297                 th->t_blocks_logged++;
3298                 journal->j_len++;
3299 
3300                 cn->bh = bh;
3301                 cn->blocknr = bh->b_blocknr;
3302                 cn->sb = sb;
3303                 cn->jlist = NULL;
3304                 insert_journal_hash(journal->j_hash_table, cn);
3305                 if (!count_already_incd) {
3306                         get_bh(bh);
3307                 }
3308         }
3309         cn->next = NULL;
3310         cn->prev = journal->j_last;
3311         cn->bh = bh;
3312         if (journal->j_last) {
3313                 journal->j_last->next = cn;
3314                 journal->j_last = cn;
3315         } else {
3316                 journal->j_first = cn;
3317                 journal->j_last = cn;
3318         }
3319         reiserfs_schedule_old_flush(sb);
3320         return 0;
3321 }
3322 
3323 int journal_end(struct reiserfs_transaction_handle *th,
3324                 struct super_block *sb, unsigned long nblocks)
3325 {
3326         if (!current->journal_info && th->t_refcount > 1)
3327                 reiserfs_warning(sb, "REISER-NESTING",
3328                                  "th NULL, refcount %d", th->t_refcount);
3329 
3330         if (!th->t_trans_id) {
3331                 WARN_ON(1);
3332                 return -EIO;
3333         }
3334 
3335         th->t_refcount--;
3336         if (th->t_refcount > 0) {
3337                 struct reiserfs_transaction_handle *cur_th =
3338                     current->journal_info;
3339 
3340                 /* we aren't allowed to close a nested transaction on a different
3341                  ** filesystem from the one in the task struct
3342                  */
3343                 BUG_ON(cur_th->t_super != th->t_super);
3344 
3345                 if (th != cur_th) {
3346                         memcpy(current->journal_info, th, sizeof(*th));
3347                         th->t_trans_id = 0;
3348                 }
3349                 return 0;
3350         } else {
3351                 return do_journal_end(th, sb, nblocks, 0);
3352         }
3353 }
3354 
3355 /* removes from the current transaction, relsing and descrementing any counters.
3356 ** also files the removed buffer directly onto the clean list
3357 **
3358 ** called by journal_mark_freed when a block has been deleted
3359 **
3360 ** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3361 */
3362 static int remove_from_transaction(struct super_block *sb,
3363                                    b_blocknr_t blocknr, int already_cleaned)
3364 {
3365         struct buffer_head *bh;
3366         struct reiserfs_journal_cnode *cn;
3367         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3368         int ret = 0;
3369 
3370         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3371         if (!cn || !cn->bh) {
3372                 return ret;
3373         }
3374         bh = cn->bh;
3375         if (cn->prev) {
3376                 cn->prev->next = cn->next;
3377         }
3378         if (cn->next) {
3379                 cn->next->prev = cn->prev;
3380         }
3381         if (cn == journal->j_first) {
3382                 journal->j_first = cn->next;
3383         }
3384         if (cn == journal->j_last) {
3385                 journal->j_last = cn->prev;
3386         }
3387         if (bh)
3388                 remove_journal_hash(sb, journal->j_hash_table, NULL,
3389                                     bh->b_blocknr, 0);
3390         clear_buffer_journaled(bh);     /* don't log this one */
3391 
3392         if (!already_cleaned) {
3393                 clear_buffer_journal_dirty(bh);
3394                 clear_buffer_dirty(bh);
3395                 clear_buffer_journal_test(bh);
3396                 put_bh(bh);
3397                 if (atomic_read(&(bh->b_count)) < 0) {
3398                         reiserfs_warning(sb, "journal-1752",
3399                                          "b_count < 0");
3400                 }
3401                 ret = 1;
3402         }
3403         journal->j_len--;
3404         journal->j_len_alloc--;
3405         free_cnode(sb, cn);
3406         return ret;
3407 }
3408 
3409 /*
3410 ** for any cnode in a journal list, it can only be dirtied of all the
3411 ** transactions that include it are committed to disk.
3412 ** this checks through each transaction, and returns 1 if you are allowed to dirty,
3413 ** and 0 if you aren't
3414 **
3415 ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3416 ** blocks for a given transaction on disk
3417 **
3418 */
3419 static int can_dirty(struct reiserfs_journal_cnode *cn)
3420 {
3421         struct super_block *sb = cn->sb;
3422         b_blocknr_t blocknr = cn->blocknr;
3423         struct reiserfs_journal_cnode *cur = cn->hprev;
3424         int can_dirty = 1;
3425 
3426         /* first test hprev.  These are all newer than cn, so any node here
3427          ** with the same block number and dev means this node can't be sent
3428          ** to disk right now.
3429          */
3430         while (cur && can_dirty) {
3431                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3432                     cur->blocknr == blocknr) {
3433                         can_dirty = 0;
3434                 }
3435                 cur = cur->hprev;
3436         }
3437         /* then test hnext.  These are all older than cn.  As long as they
3438          ** are committed to the log, it is safe to write cn to disk
3439          */
3440         cur = cn->hnext;
3441         while (cur && can_dirty) {
3442                 if (cur->jlist && cur->jlist->j_len > 0 &&
3443                     atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3444                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3445                         can_dirty = 0;
3446                 }
3447                 cur = cur->hnext;
3448         }
3449         return can_dirty;
3450 }
3451 
3452 /* syncs the commit blocks, but does not force the real buffers to disk
3453 ** will wait until the current transaction is done/committed before returning
3454 */
3455 int journal_end_sync(struct reiserfs_transaction_handle *th,
3456                      struct super_block *sb, unsigned long nblocks)
3457 {
3458         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3459 
3460         BUG_ON(!th->t_trans_id);
3461         /* you can sync while nested, very, very bad */
3462         BUG_ON(th->t_refcount > 1);
3463         if (journal->j_len == 0) {
3464                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3465                                              1);
3466                 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3467         }
3468         return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
3469 }
3470 
3471 /*
3472 ** writeback the pending async commits to disk
3473 */
3474 static void flush_async_commits(struct work_struct *work)
3475 {
3476         struct reiserfs_journal *journal =
3477                 container_of(work, struct reiserfs_journal, j_work.work);
3478         struct super_block *sb = journal->j_work_sb;
3479         struct reiserfs_journal_list *jl;
3480         struct list_head *entry;
3481 
3482         reiserfs_write_lock(sb);
3483         if (!list_empty(&journal->j_journal_list)) {
3484                 /* last entry is the youngest, commit it and you get everything */
3485                 entry = journal->j_journal_list.prev;
3486                 jl = JOURNAL_LIST_ENTRY(entry);
3487                 flush_commit_list(sb, jl, 1);
3488         }
3489         reiserfs_write_unlock(sb);
3490 }
3491 
3492 /*
3493 ** flushes any old transactions to disk
3494 ** ends the current transaction if it is too old
3495 */
3496 void reiserfs_flush_old_commits(struct super_block *sb)
3497 {
3498         time_t now;
3499         struct reiserfs_transaction_handle th;
3500         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3501 
3502         now = get_seconds();
3503         /* safety check so we don't flush while we are replaying the log during
3504          * mount
3505          */
3506         if (list_empty(&journal->j_journal_list))
3507                 return;
3508 
3509         /* check the current transaction.  If there are no writers, and it is
3510          * too old, finish it, and force the commit blocks to disk
3511          */
3512         if (atomic_read(&journal->j_wcount) <= 0 &&
3513             journal->j_trans_start_time > 0 &&
3514             journal->j_len > 0 &&
3515             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3516                 if (!journal_join(&th, sb, 1)) {
3517                         reiserfs_prepare_for_journal(sb,
3518                                                      SB_BUFFER_WITH_SB(sb),
3519                                                      1);
3520                         journal_mark_dirty(&th, sb,
3521                                            SB_BUFFER_WITH_SB(sb));
3522 
3523                         /* we're only being called from kreiserfsd, it makes no sense to do
3524                          ** an async commit so that kreiserfsd can do it later
3525                          */
3526                         do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
3527                 }
3528         }
3529 }
3530 
3531 /*
3532 ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3533 **
3534 ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3535 ** the writers are done.  By the time it wakes up, the transaction it was called has already ended, so it just
3536 ** flushes the commit list and returns 0.
3537 **
3538 ** Won't batch when flush or commit_now is set.  Also won't batch when others are waiting on j_join_wait.
3539 **
3540 ** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3541 */
3542 static int check_journal_end(struct reiserfs_transaction_handle *th,
3543                              struct super_block *sb, unsigned long nblocks,
3544                              int flags)
3545 {
3546 
3547         time_t now;
3548         int flush = flags & FLUSH_ALL;
3549         int commit_now = flags & COMMIT_NOW;
3550         int wait_on_commit = flags & WAIT;
3551         struct reiserfs_journal_list *jl;
3552         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3553 
3554         BUG_ON(!th->t_trans_id);
3555 
3556         if (th->t_trans_id != journal->j_trans_id) {
3557                 reiserfs_panic(th->t_super, "journal-1577",
3558                                "handle trans id %ld != current trans id %ld",
3559                                th->t_trans_id, journal->j_trans_id);
3560         }
3561 
3562         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3563         if (atomic_read(&(journal->j_wcount)) > 0) {    /* <= 0 is allowed.  unmounting might not call begin */
3564                 atomic_dec(&(journal->j_wcount));
3565         }
3566 
3567         /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3568          ** will be dealt with by next transaction that actually writes something, but should be taken
3569          ** care of in this trans
3570          */
3571         BUG_ON(journal->j_len == 0);
3572 
3573         /* if wcount > 0, and we are called to with flush or commit_now,
3574          ** we wait on j_join_wait.  We will wake up when the last writer has
3575          ** finished the transaction, and started it on its way to the disk.
3576          ** Then, we flush the commit or journal list, and just return 0
3577          ** because the rest of journal end was already done for this transaction.
3578          */
3579         if (atomic_read(&(journal->j_wcount)) > 0) {
3580                 if (flush || commit_now) {
3581                         unsigned trans_id;
3582 
3583                         jl = journal->j_current_jl;
3584                         trans_id = jl->j_trans_id;
3585                         if (wait_on_commit)
3586                                 jl->j_state |= LIST_COMMIT_PENDING;
3587                         atomic_set(&(journal->j_jlock), 1);
3588                         if (flush) {
3589                                 journal->j_next_full_flush = 1;
3590                         }
3591                         unlock_journal(sb);
3592 
3593                         /* sleep while the current transaction is still j_jlocked */
3594                         while (journal->j_trans_id == trans_id) {
3595                                 if (atomic_read(&journal->j_jlock)) {
3596                                         queue_log_writer(sb);
3597                                 } else {
3598                                         lock_journal(sb);
3599                                         if (journal->j_trans_id == trans_id) {
3600                                                 atomic_set(&(journal->j_jlock),
3601                                                            1);
3602                                         }
3603                                         unlock_journal(sb);
3604                                 }
3605                         }
3606                         BUG_ON(journal->j_trans_id == trans_id);
3607                         
3608                         if (commit_now
3609                             && journal_list_still_alive(sb, trans_id)
3610                             && wait_on_commit) {
3611                                 flush_commit_list(sb, jl, 1);
3612                         }
3613                         return 0;
3614                 }
3615                 unlock_journal(sb);
3616                 return 0;
3617         }
3618 
3619         /* deal with old transactions where we are the last writers */
3620         now = get_seconds();
3621         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3622                 commit_now = 1;
3623                 journal->j_next_async_flush = 1;
3624         }
3625         /* don't batch when someone is waiting on j_join_wait */
3626         /* don't batch when syncing the commit or flushing the whole trans */
3627         if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3628             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3629             && journal->j_len_alloc < journal->j_max_batch
3630             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3631                 journal->j_bcount++;
3632                 unlock_journal(sb);
3633                 return 0;
3634         }
3635 
3636         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3637                 reiserfs_panic(sb, "journal-003",
3638                                "j_start (%ld) is too high",
3639                                journal->j_start);
3640         }
3641         return 1;
3642 }
3643 
3644 /*
3645 ** Does all the work that makes deleting blocks safe.
3646 ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3647 **
3648 ** otherwise:
3649 ** set a bit for the block in the journal bitmap.  That will prevent it from being allocated for unformatted nodes
3650 ** before this transaction has finished.
3651 **
3652 ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.  That will prevent any old transactions with
3653 ** this block from trying to flush to the real location.  Since we aren't removing the cnode from the journal_list_hash,
3654 ** the block can't be reallocated yet.
3655 **
3656 ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3657 */
3658 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3659                        struct super_block *sb, b_blocknr_t blocknr)
3660 {
3661         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3662         struct reiserfs_journal_cnode *cn = NULL;
3663         struct buffer_head *bh = NULL;
3664         struct reiserfs_list_bitmap *jb = NULL;
3665         int cleaned = 0;
3666         BUG_ON(!th->t_trans_id);
3667 
3668         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3669         if (cn && cn->bh) {
3670                 bh = cn->bh;
3671                 get_bh(bh);
3672         }
3673         /* if it is journal new, we just remove it from this transaction */
3674         if (bh && buffer_journal_new(bh)) {
3675                 clear_buffer_journal_new(bh);
3676                 clear_prepared_bits(bh);
3677                 reiserfs_clean_and_file_buffer(bh);
3678                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3679         } else {
3680                 /* set the bit for this block in the journal bitmap for this transaction */
3681                 jb = journal->j_current_jl->j_list_bitmap;
3682                 if (!jb) {
3683                         reiserfs_panic(sb, "journal-1702",
3684                                        "journal_list_bitmap is NULL");
3685                 }
3686                 set_bit_in_list_bitmap(sb, blocknr, jb);
3687 
3688                 /* Note, the entire while loop is not allowed to schedule.  */
3689 
3690                 if (bh) {
3691                         clear_prepared_bits(bh);
3692                         reiserfs_clean_and_file_buffer(bh);
3693                 }
3694                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3695 
3696                 /* find all older transactions with this block, make sure they don't try to write it out */
3697                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3698                                           blocknr);
3699                 while (cn) {
3700                         if (sb == cn->sb && blocknr == cn->blocknr) {
3701                                 set_bit(BLOCK_FREED, &cn->state);
3702                                 if (cn->bh) {
3703                                         if (!cleaned) {
3704                                                 /* remove_from_transaction will brelse the buffer if it was 
3705                                                  ** in the current trans
3706                                                  */
3707                                                 clear_buffer_journal_dirty(cn->
3708                                                                            bh);
3709                                                 clear_buffer_dirty(cn->bh);
3710                                                 clear_buffer_journal_test(cn->
3711                                                                           bh);
3712                                                 cleaned = 1;
3713                                                 put_bh(cn->bh);
3714                                                 if (atomic_read
3715                                                     (&(cn->bh->b_count)) < 0) {
3716                                                         reiserfs_warning(sb,
3717                                                                  "journal-2138",
3718                                                                  "cn->bh->b_count < 0");
3719                                                 }
3720                                         }
3721                                         if (cn->jlist) {        /* since we are clearing the bh, we MUST dec nonzerolen */
3722                                                 atomic_dec(&
3723                                                            (cn->jlist->
3724                                                             j_nonzerolen));
3725                                         }
3726                                         cn->bh = NULL;
3727                                 }
3728                         }
3729                         cn = cn->hnext;
3730                 }
3731         }
3732 
3733         if (bh)
3734                 release_buffer_page(bh); /* get_hash grabs the buffer */
3735         return 0;
3736 }
3737 
3738 void reiserfs_update_inode_transaction(struct inode *inode)
3739 {
3740         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3741         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3742         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3743 }
3744 
3745 /*
3746  * returns -1 on error, 0 if no commits/barriers were done and 1
3747  * if a transaction was actually committed and the barrier was done
3748  */
3749 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3750                              struct reiserfs_journal_list *jl)
3751 {
3752         struct reiserfs_transaction_handle th;
3753         struct super_block *sb = inode->i_sb;
3754         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3755         int ret = 0;
3756 
3757         /* is it from the current transaction, or from an unknown transaction? */
3758         if (id == journal->j_trans_id) {
3759                 jl = journal->j_current_jl;
3760                 /* try to let other writers come in and grow this transaction */
3761                 let_transaction_grow(sb, id);
3762                 if (journal->j_trans_id != id) {
3763                         goto flush_commit_only;
3764                 }
3765 
3766                 ret = journal_begin(&th, sb, 1);
3767                 if (ret)
3768                         return ret;
3769 
3770                 /* someone might have ended this transaction while we joined */
3771                 if (journal->j_trans_id != id) {
3772                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3773                                                      1);
3774                         journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3775                         ret = journal_end(&th, sb, 1);
3776                         goto flush_commit_only;
3777                 }
3778 
3779                 ret = journal_end_sync(&th, sb, 1);
3780                 if (!ret)
3781                         ret = 1;
3782 
3783         } else {
3784                 /* this gets tricky, we have to make sure the journal list in
3785                  * the inode still exists.  We know the list is still around
3786                  * if we've got a larger transaction id than the oldest list
3787                  */
3788               flush_commit_only:
3789                 if (journal_list_still_alive(inode->i_sb, id)) {
3790                         /*
3791                          * we only set ret to 1 when we know for sure
3792                          * the barrier hasn't been started yet on the commit
3793                          * block.
3794                          */
3795                         if (atomic_read(&jl->j_commit_left) > 1)
3796                                 ret = 1;
3797                         flush_commit_list(sb, jl, 1);
3798                         if (journal->j_errno)
3799                                 ret = journal->j_errno;
3800                 }
3801         }
3802         /* otherwise the list is gone, and long since committed */
3803         return ret;
3804 }
3805 
3806 int reiserfs_commit_for_inode(struct inode *inode)
3807 {
3808         unsigned int id = REISERFS_I(inode)->i_trans_id;
3809         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3810 
3811         /* for the whole inode, assume unset id means it was
3812          * changed in the current transaction.  More conservative
3813          */
3814         if (!id || !jl) {
3815                 reiserfs_update_inode_transaction(inode);
3816                 id = REISERFS_I(inode)->i_trans_id;
3817                 /* jl will be updated in __commit_trans_jl */
3818         }
3819 
3820         return __commit_trans_jl(inode, id, jl);
3821 }
3822 
3823 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3824                                       struct buffer_head *bh)
3825 {
3826         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3827         PROC_INFO_INC(sb, journal.restore_prepared);
3828         if (!bh) {
3829                 return;
3830         }
3831         if (test_clear_buffer_journal_restore_dirty(bh) &&
3832             buffer_journal_dirty(bh)) {
3833                 struct reiserfs_journal_cnode *cn;
3834                 cn = get_journal_hash_dev(sb,
3835                                           journal->j_list_hash_table,
3836                                           bh->b_blocknr);
3837                 if (cn && can_dirty(cn)) {
3838                         set_buffer_journal_test(bh);
3839                         mark_buffer_dirty(bh);
3840                 }
3841         }
3842         clear_buffer_journal_prepared(bh);
3843 }
3844 
3845 extern struct tree_balance *cur_tb;
3846 /*
3847 ** before we can change a metadata block, we have to make sure it won't
3848 ** be written to disk while we are altering it.  So, we must:
3849 ** clean it
3850 ** wait on it.
3851 **
3852 */
3853 int reiserfs_prepare_for_journal(struct super_block *sb,
3854                                  struct buffer_head *bh, int wait)
3855 {
3856         PROC_INFO_INC(sb, journal.prepare);
3857 
3858         if (!trylock_buffer(bh)) {
3859                 if (!wait)
3860                         return 0;
3861                 lock_buffer(bh);
3862         }
3863         set_buffer_journal_prepared(bh);
3864         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3865                 clear_buffer_journal_test(bh);
3866                 set_buffer_journal_restore_dirty(bh);
3867         }
3868         unlock_buffer(bh);
3869         return 1;
3870 }
3871 
3872 static void flush_old_journal_lists(struct super_block *s)
3873 {
3874         struct reiserfs_journal *journal = SB_JOURNAL(s);
3875         struct reiserfs_journal_list *jl;
3876         struct list_head *entry;
3877         time_t now = get_seconds();
3878 
3879         while (!list_empty(&journal->j_journal_list)) {
3880                 entry = journal->j_journal_list.next;
3881                 jl = JOURNAL_LIST_ENTRY(entry);
3882                 /* this check should always be run, to send old lists to disk */
3883                 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3884                     atomic_read(&jl->j_commit_left) == 0 &&
3885                     test_transaction(s, jl)) {
3886                         flush_used_journal_lists(s, jl);
3887                 } else {
3888                         break;
3889                 }
3890         }
3891 }
3892 
3893 /*
3894 ** long and ugly.  If flush, will not return until all commit
3895 ** blocks and all real buffers in the trans are on disk.
3896 ** If no_async, won't return until all commit blocks are on disk.
3897 **
3898 ** keep reading, there are comments as you go along
3899 **
3900 ** If the journal is aborted, we just clean up. Things like flushing
3901 ** journal lists, etc just won't happen.
3902 */
3903 static int do_journal_end(struct reiserfs_transaction_handle *th,
3904                           struct super_block *sb, unsigned long nblocks,
3905                           int flags)
3906 {
3907         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3908         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3909         struct reiserfs_journal_cnode *last_cn = NULL;
3910         struct reiserfs_journal_desc *desc;
3911         struct reiserfs_journal_commit *commit;
3912         struct buffer_head *c_bh;       /* commit bh */
3913         struct buffer_head *d_bh;       /* desc bh */
3914         int cur_write_start = 0;        /* start index of current log write */
3915         int old_start;
3916         int i;
3917         int flush;
3918         int wait_on_commit;
3919         struct reiserfs_journal_list *jl, *temp_jl;
3920         struct list_head *entry, *safe;
3921         unsigned long jindex;
3922         unsigned int commit_trans_id;
3923         int trans_half;
3924 
3925         BUG_ON(th->t_refcount > 1);
3926         BUG_ON(!th->t_trans_id);
3927 
3928         /* protect flush_older_commits from doing mistakes if the
3929            transaction ID counter gets overflowed.  */
3930         if (th->t_trans_id == ~0U)
3931                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3932         flush = flags & FLUSH_ALL;
3933         wait_on_commit = flags & WAIT;
3934 
3935         current->journal_info = th->t_handle_save;
3936         reiserfs_check_lock_depth(sb, "journal end");
3937         if (journal->j_len == 0) {
3938                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3939                                              1);
3940                 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3941         }
3942 
3943         lock_journal(sb);
3944         if (journal->j_next_full_flush) {
3945                 flags |= FLUSH_ALL;
3946                 flush = 1;
3947         }
3948         if (journal->j_next_async_flush) {
3949                 flags |= COMMIT_NOW | WAIT;
3950                 wait_on_commit = 1;
3951         }
3952 
3953         /* check_journal_end locks the journal, and unlocks if it does not return 1
3954          ** it tells us if we should continue with the journal_end, or just return
3955          */
3956         if (!check_journal_end(th, sb, nblocks, flags)) {
3957                 reiserfs_schedule_old_flush(sb);
3958                 wake_queued_writers(sb);
3959                 reiserfs_async_progress_wait(sb);
3960                 goto out;
3961         }
3962 
3963         /* check_journal_end might set these, check again */
3964         if (journal->j_next_full_flush) {
3965                 flush = 1;
3966         }
3967 
3968         /*
3969          ** j must wait means we have to flush the log blocks, and the real blocks for
3970          ** this transaction
3971          */
3972         if (journal->j_must_wait > 0) {
3973                 flush = 1;
3974         }
3975 #ifdef REISERFS_PREALLOCATE
3976         /* quota ops might need to nest, setup the journal_info pointer for them
3977          * and raise the refcount so that it is > 0. */
3978         current->journal_info = th;
3979         th->t_refcount++;
3980         reiserfs_discard_all_prealloc(th);      /* it should not involve new blocks into
3981                                                  * the transaction */
3982         th->t_refcount--;
3983         current->journal_info = th->t_handle_save;
3984 #endif
3985 
3986         /* setup description block */
3987         d_bh =
3988             journal_getblk(sb,
3989                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
3990                            journal->j_start);
3991         set_buffer_uptodate(d_bh);
3992         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
3993         memset(d_bh->b_data, 0, d_bh->b_size);
3994         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
3995         set_desc_trans_id(desc, journal->j_trans_id);
3996 
3997         /* setup commit block.  Don't write (keep it clean too) this one until after everyone else is written */
3998         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
3999                               ((journal->j_start + journal->j_len +
4000                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4001         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4002         memset(c_bh->b_data, 0, c_bh->b_size);
4003         set_commit_trans_id(commit, journal->j_trans_id);
4004         set_buffer_uptodate(c_bh);
4005 
4006         /* init this journal list */
4007         jl = journal->j_current_jl;
4008 
4009         /* we lock the commit before doing anything because
4010          * we want to make sure nobody tries to run flush_commit_list until
4011          * the new transaction is fully setup, and we've already flushed the
4012          * ordered bh list
4013          */
4014         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4015 
4016         /* save the transaction id in case we need to commit it later */
4017         commit_trans_id = jl->j_trans_id;
4018 
4019         atomic_set(&jl->j_older_commits_done, 0);
4020         jl->j_trans_id = journal->j_trans_id;
4021         jl->j_timestamp = journal->j_trans_start_time;
4022         jl->j_commit_bh = c_bh;
4023         jl->j_start = journal->j_start;
4024         jl->j_len = journal->j_len;
4025         atomic_set(&jl->j_nonzerolen, journal->j_len);
4026         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4027         jl->j_realblock = NULL;
4028 
4029         /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4030          **  for each real block, add it to the journal list hash,
4031          ** copy into real block index array in the commit or desc block
4032          */
4033         trans_half = journal_trans_half(sb->s_blocksize);
4034         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4035                 if (buffer_journaled(cn->bh)) {
4036                         jl_cn = get_cnode(sb);
4037                         if (!jl_cn) {
4038                                 reiserfs_panic(sb, "journal-1676",
4039                                                "get_cnode returned NULL");
4040                         }
4041                         if (i == 0) {
4042                                 jl->j_realblock = jl_cn;
4043                         }
4044                         jl_cn->prev = last_cn;
4045                         jl_cn->next = NULL;
4046                         if (last_cn) {
4047                                 last_cn->next = jl_cn;
4048                         }
4049                         last_cn = jl_cn;
4050                         /* make sure the block we are trying to log is not a block
4051                            of journal or reserved area */
4052 
4053                         if (is_block_in_log_or_reserved_area
4054                             (sb, cn->bh->b_blocknr)) {
4055                                 reiserfs_panic(sb, "journal-2332",
4056                                                "Trying to log block %lu, "
4057                                                "which is a log block",
4058                                                cn->bh->b_blocknr);
4059                         }
4060                         jl_cn->blocknr = cn->bh->b_blocknr;
4061                         jl_cn->state = 0;
4062                         jl_cn->sb = sb;
4063                         jl_cn->bh = cn->bh;
4064                         jl_cn->jlist = jl;
4065                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4066                         if (i < trans_half) {
4067                                 desc->j_realblock[i] =
4068                                     cpu_to_le32(cn->bh->b_blocknr);
4069                         } else {
4070                                 commit->j_realblock[i - trans_half] =
4071                                     cpu_to_le32(cn->bh->b_blocknr);
4072                         }
4073                 } else {
4074                         i--;
4075                 }
4076         }
4077         set_desc_trans_len(desc, journal->j_len);
4078         set_desc_mount_id(desc, journal->j_mount_id);
4079         set_desc_trans_id(desc, journal->j_trans_id);
4080         set_commit_trans_len(commit, journal->j_len);
4081 
4082         /* special check in case all buffers in the journal were marked for not logging */
4083         BUG_ON(journal->j_len == 0);
4084 
4085         /* we're about to dirty all the log blocks, mark the description block
4086          * dirty now too.  Don't mark the commit block dirty until all the
4087          * others are on disk
4088          */
4089         mark_buffer_dirty(d_bh);
4090 
4091         /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4092         cur_write_start = journal->j_start;
4093         cn = journal->j_first;
4094         jindex = 1;             /* start at one so we don't get the desc again */
4095         while (cn) {
4096                 clear_buffer_journal_new(cn->bh);
4097                 /* copy all the real blocks into log area.  dirty log blocks */
4098                 if (buffer_journaled(cn->bh)) {
4099                         struct buffer_head *tmp_bh;
4100                         char *addr;
4101                         struct page *page;
4102                         tmp_bh =
4103                             journal_getblk(sb,
4104                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4105                                            ((cur_write_start +
4106                                              jindex) %
4107                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4108                         set_buffer_uptodate(tmp_bh);
4109                         page = cn->bh->b_page;
4110                         addr = kmap(page);
4111                         memcpy(tmp_bh->b_data,
4112                                addr + offset_in_page(cn->bh->b_data),
4113                                cn->bh->b_size);
4114                         kunmap(page);
4115                         mark_buffer_dirty(tmp_bh);
4116                         jindex++;
4117                         set_buffer_journal_dirty(cn->bh);
4118                         clear_buffer_journaled(cn->bh);
4119                 } else {
4120                         /* JDirty cleared sometime during transaction.  don't log this one */
4121                         reiserfs_warning(sb, "journal-2048",
4122                                          "BAD, buffer in journal hash, "
4123                                          "but not JDirty!");
4124                         brelse(cn->bh);
4125                 }
4126                 next = cn->next;
4127                 free_cnode(sb, cn);
4128                 cn = next;
4129                 reiserfs_write_unlock(sb);
4130                 cond_resched();
4131                 reiserfs_write_lock(sb);
4132         }
4133 
4134         /* we are done  with both the c_bh and d_bh, but
4135          ** c_bh must be written after all other commit blocks,
4136          ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4137          */
4138 
4139         journal->j_current_jl = alloc_journal_list(sb);
4140 
4141         /* now it is safe to insert this transaction on the main list */
4142         list_add_tail(&jl->j_list, &journal->j_journal_list);
4143         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4144         journal->j_num_work_lists++;
4145 
4146         /* reset journal values for the next transaction */
4147         old_start = journal->j_start;
4148         journal->j_start =
4149             (journal->j_start + journal->j_len +
4150              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4151         atomic_set(&(journal->j_wcount), 0);
4152         journal->j_bcount = 0;
4153         journal->j_last = NULL;
4154         journal->j_first = NULL;
4155         journal->j_len = 0;
4156         journal->j_trans_start_time = 0;
4157         /* check for trans_id overflow */
4158         if (++journal->j_trans_id == 0)
4159                 journal->j_trans_id = 10;
4160         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4161         journal->j_must_wait = 0;
4162         journal->j_len_alloc = 0;
4163         journal->j_next_full_flush = 0;
4164         journal->j_next_async_flush = 0;
4165         init_journal_hash(sb);
4166 
4167         // make sure reiserfs_add_jh sees the new current_jl before we
4168         // write out the tails
4169         smp_mb();
4170 
4171         /* tail conversion targets have to hit the disk before we end the
4172          * transaction.  Otherwise a later transaction might repack the tail
4173          * before this transaction commits, leaving the data block unflushed and
4174          * clean, if we crash before the later transaction commits, the data block
4175          * is lost.
4176          */
4177         if (!list_empty(&jl->j_tail_bh_list)) {
4178                 reiserfs_write_unlock(sb);
4179                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4180                                       journal, jl, &jl->j_tail_bh_list);
4181                 reiserfs_write_lock(sb);
4182         }
4183         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4184         mutex_unlock(&jl->j_commit_mutex);
4185 
4186         /* honor the flush wishes from the caller, simple commits can
4187          ** be done outside the journal lock, they are done below
4188          **
4189          ** if we don't flush the commit list right now, we put it into
4190          ** the work queue so the people waiting on the async progress work
4191          ** queue don't wait for this proc to flush journal lists and such.
4192          */
4193         if (flush) {
4194                 flush_commit_list(sb, jl, 1);
4195                 flush_journal_list(sb, jl, 1);
4196         } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4197                 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4198 
4199         /* if the next transaction has any chance of wrapping, flush
4200          ** transactions that might get overwritten.  If any journal lists are very
4201          ** old flush them as well.
4202          */
4203       first_jl:
4204         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4205                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4206                 if (journal->j_start <= temp_jl->j_start) {
4207                         if ((journal->j_start + journal->j_trans_max + 1) >=
4208                             temp_jl->j_start) {
4209                                 flush_used_journal_lists(sb, temp_jl);
4210                                 goto first_jl;
4211                         } else if ((journal->j_start +
4212                                     journal->j_trans_max + 1) <
4213                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4214                                 /* if we don't cross into the next transaction and we don't
4215                                  * wrap, there is no way we can overlap any later transactions
4216                                  * break now
4217                                  */
4218                                 break;
4219                         }
4220                 } else if ((journal->j_start +
4221                             journal->j_trans_max + 1) >
4222                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4223                         if (((journal->j_start + journal->j_trans_max + 1) %
4224                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4225                             temp_jl->j_start) {
4226                                 flush_used_journal_lists(sb, temp_jl);
4227                                 goto first_jl;
4228                         } else {
4229                                 /* we don't overlap anything from out start to the end of the
4230                                  * log, and our wrapped portion doesn't overlap anything at
4231                                  * the start of the log.  We can break
4232                                  */
4233                                 break;
4234                         }
4235                 }
4236         }
4237         flush_old_journal_lists(sb);
4238 
4239         journal->j_current_jl->j_list_bitmap =
4240             get_list_bitmap(sb, journal->j_current_jl);
4241 
4242         if (!(journal->j_current_jl->j_list_bitmap)) {
4243                 reiserfs_panic(sb, "journal-1996",
4244                                "could not get a list bitmap");
4245         }
4246 
4247         atomic_set(&(journal->j_jlock), 0);
4248         unlock_journal(sb);
4249         /* wake up any body waiting to join. */
4250         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4251         wake_up(&(journal->j_join_wait));
4252 
4253         if (!flush && wait_on_commit &&
4254             journal_list_still_alive(sb, commit_trans_id)) {
4255                 flush_commit_list(sb, jl, 1);
4256         }
4257       out:
4258         reiserfs_check_lock_depth(sb, "journal end2");
4259 
4260         memset(th, 0, sizeof(*th));
4261         /* Re-set th->t_super, so we can properly keep track of how many
4262          * persistent transactions there are. We need to do this so if this
4263          * call is part of a failed restart_transaction, we can free it later */
4264         th->t_super = sb;
4265 
4266         return journal->j_errno;
4267 }
4268 
4269 /* Send the file system read only and refuse new transactions */
4270 void reiserfs_abort_journal(struct super_block *sb, int errno)
4271 {
4272         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4273         if (test_bit(J_ABORTED, &journal->j_state))
4274                 return;
4275 
4276         if (!journal->j_errno)
4277                 journal->j_errno = errno;
4278 
4279         sb->s_flags |= MS_RDONLY;
4280         set_bit(J_ABORTED, &journal->j_state);
4281 
4282 #ifdef CONFIG_REISERFS_CHECK
4283         dump_stack();
4284 #endif
4285 }
4286 

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