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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Write ahead logging implementation copyright Chris Mason 2000
  4  *
  5  * The background commits make this code very interrelated, and
  6  * overly complex.  I need to rethink things a bit....The major players:
  7  *
  8  * journal_begin -- call with the number of blocks you expect to log.
  9  *                  If the current transaction is too
 10  *                  old, it will block until the current transaction is
 11  *                  finished, and then start a new one.
 12  *                  Usually, your transaction will get joined in with
 13  *                  previous ones for speed.
 14  *
 15  * journal_join  -- same as journal_begin, but won't block on the current
 16  *                  transaction regardless of age.  Don't ever call
 17  *                  this.  Ever.  There are only two places it should be
 18  *                  called from, and they are both inside this file.
 19  *
 20  * journal_mark_dirty -- adds blocks into this transaction.  clears any flags
 21  *                       that might make them get sent to disk
 22  *                       and then marks them BH_JDirty.  Puts the buffer head
 23  *                       into the current transaction hash.
 24  *
 25  * journal_end -- if the current transaction is batchable, it does nothing
 26  *                   otherwise, it could do an async/synchronous commit, or
 27  *                   a full flush of all log and real blocks in the
 28  *                   transaction.
 29  *
 30  * flush_old_commits -- if the current transaction is too old, it is ended and
 31  *                      commit blocks are sent to disk.  Forces commit blocks
 32  *                      to disk for all backgrounded commits that have been
 33  *                      around too long.
 34  *                   -- Note, if you call this as an immediate flush from
 35  *                      from within kupdate, it will ignore the immediate flag
 36  */
 37 
 38 #include <linux/time.h>
 39 #include <linux/semaphore.h>
 40 #include <linux/vmalloc.h>
 41 #include "reiserfs.h"
 42 #include <linux/kernel.h>
 43 #include <linux/errno.h>
 44 #include <linux/fcntl.h>
 45 #include <linux/stat.h>
 46 #include <linux/string.h>
 47 #include <linux/buffer_head.h>
 48 #include <linux/workqueue.h>
 49 #include <linux/writeback.h>
 50 #include <linux/blkdev.h>
 51 #include <linux/backing-dev.h>
 52 #include <linux/uaccess.h>
 53 #include <linux/slab.h>
 54 
 55 
 56 /* gets a struct reiserfs_journal_list * from a list head */
 57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
 58                                j_list))
 59 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
 60                                j_working_list))
 61 
 62 /* must be correct to keep the desc and commit structs at 4k */
 63 #define JOURNAL_TRANS_HALF 1018
 64 #define BUFNR 64                /*read ahead */
 65 
 66 /* cnode stat bits.  Move these into reiserfs_fs.h */
 67 
 68 /* this block was freed, and can't be written.  */
 69 #define BLOCK_FREED 2
 70 /* this block was freed during this transaction, and can't be written */
 71 #define BLOCK_FREED_HOLDER 3
 72 
 73 /* used in flush_journal_list */
 74 #define BLOCK_NEEDS_FLUSH 4
 75 #define BLOCK_DIRTIED 5
 76 
 77 /* journal list state bits */
 78 #define LIST_TOUCHED 1
 79 #define LIST_DIRTY   2
 80 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
 81 
 82 /* flags for do_journal_end */
 83 #define FLUSH_ALL   1           /* flush commit and real blocks */
 84 #define COMMIT_NOW  2           /* end and commit this transaction */
 85 #define WAIT        4           /* wait for the log blocks to hit the disk */
 86 
 87 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
 88 static int flush_journal_list(struct super_block *s,
 89                               struct reiserfs_journal_list *jl, int flushall);
 90 static int flush_commit_list(struct super_block *s,
 91                              struct reiserfs_journal_list *jl, int flushall);
 92 static int can_dirty(struct reiserfs_journal_cnode *cn);
 93 static int journal_join(struct reiserfs_transaction_handle *th,
 94                         struct super_block *sb);
 95 static void release_journal_dev(struct super_block *super,
 96                                struct reiserfs_journal *journal);
 97 static int dirty_one_transaction(struct super_block *s,
 98                                  struct reiserfs_journal_list *jl);
 99 static void flush_async_commits(struct work_struct *work);
100 static void queue_log_writer(struct super_block *s);
101 
102 /* values for join in do_journal_begin_r */
103 enum {
104         JBEGIN_REG = 0,         /* regular journal begin */
105         /* join the running transaction if at all possible */
106         JBEGIN_JOIN = 1,
107         /* called from cleanup code, ignores aborted flag */
108         JBEGIN_ABORT = 2,
109 };
110 
111 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
112                               struct super_block *sb,
113                               unsigned long nblocks, int join);
114 
115 static void init_journal_hash(struct super_block *sb)
116 {
117         struct reiserfs_journal *journal = SB_JOURNAL(sb);
118         memset(journal->j_hash_table, 0,
119                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
120 }
121 
122 /*
123  * clears BH_Dirty and sticks the buffer on the clean list.  Called because
124  * I can't allow refile_buffer to make schedule happen after I've freed a
125  * block.  Look at remove_from_transaction and journal_mark_freed for
126  * more details.
127  */
128 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
129 {
130         if (bh) {
131                 clear_buffer_dirty(bh);
132                 clear_buffer_journal_test(bh);
133         }
134         return 0;
135 }
136 
137 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
138                                                          *sb)
139 {
140         struct reiserfs_bitmap_node *bn;
141         static int id;
142 
143         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
144         if (!bn) {
145                 return NULL;
146         }
147         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
148         if (!bn->data) {
149                 kfree(bn);
150                 return NULL;
151         }
152         bn->id = id++;
153         INIT_LIST_HEAD(&bn->list);
154         return bn;
155 }
156 
157 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
158 {
159         struct reiserfs_journal *journal = SB_JOURNAL(sb);
160         struct reiserfs_bitmap_node *bn = NULL;
161         struct list_head *entry = journal->j_bitmap_nodes.next;
162 
163         journal->j_used_bitmap_nodes++;
164 repeat:
165 
166         if (entry != &journal->j_bitmap_nodes) {
167                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
168                 list_del(entry);
169                 memset(bn->data, 0, sb->s_blocksize);
170                 journal->j_free_bitmap_nodes--;
171                 return bn;
172         }
173         bn = allocate_bitmap_node(sb);
174         if (!bn) {
175                 yield();
176                 goto repeat;
177         }
178         return bn;
179 }
180 static inline void free_bitmap_node(struct super_block *sb,
181                                     struct reiserfs_bitmap_node *bn)
182 {
183         struct reiserfs_journal *journal = SB_JOURNAL(sb);
184         journal->j_used_bitmap_nodes--;
185         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
186                 kfree(bn->data);
187                 kfree(bn);
188         } else {
189                 list_add(&bn->list, &journal->j_bitmap_nodes);
190                 journal->j_free_bitmap_nodes++;
191         }
192 }
193 
194 static void allocate_bitmap_nodes(struct super_block *sb)
195 {
196         int i;
197         struct reiserfs_journal *journal = SB_JOURNAL(sb);
198         struct reiserfs_bitmap_node *bn = NULL;
199         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
200                 bn = allocate_bitmap_node(sb);
201                 if (bn) {
202                         list_add(&bn->list, &journal->j_bitmap_nodes);
203                         journal->j_free_bitmap_nodes++;
204                 } else {
205                         /* this is ok, we'll try again when more are needed */
206                         break;
207                 }
208         }
209 }
210 
211 static int set_bit_in_list_bitmap(struct super_block *sb,
212                                   b_blocknr_t block,
213                                   struct reiserfs_list_bitmap *jb)
214 {
215         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
216         unsigned int bit_nr = block % (sb->s_blocksize << 3);
217 
218         if (!jb->bitmaps[bmap_nr]) {
219                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
220         }
221         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
222         return 0;
223 }
224 
225 static void cleanup_bitmap_list(struct super_block *sb,
226                                 struct reiserfs_list_bitmap *jb)
227 {
228         int i;
229         if (jb->bitmaps == NULL)
230                 return;
231 
232         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
233                 if (jb->bitmaps[i]) {
234                         free_bitmap_node(sb, jb->bitmaps[i]);
235                         jb->bitmaps[i] = NULL;
236                 }
237         }
238 }
239 
240 /*
241  * only call this on FS unmount.
242  */
243 static int free_list_bitmaps(struct super_block *sb,
244                              struct reiserfs_list_bitmap *jb_array)
245 {
246         int i;
247         struct reiserfs_list_bitmap *jb;
248         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
249                 jb = jb_array + i;
250                 jb->journal_list = NULL;
251                 cleanup_bitmap_list(sb, jb);
252                 vfree(jb->bitmaps);
253                 jb->bitmaps = NULL;
254         }
255         return 0;
256 }
257 
258 static int free_bitmap_nodes(struct super_block *sb)
259 {
260         struct reiserfs_journal *journal = SB_JOURNAL(sb);
261         struct list_head *next = journal->j_bitmap_nodes.next;
262         struct reiserfs_bitmap_node *bn;
263 
264         while (next != &journal->j_bitmap_nodes) {
265                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
266                 list_del(next);
267                 kfree(bn->data);
268                 kfree(bn);
269                 next = journal->j_bitmap_nodes.next;
270                 journal->j_free_bitmap_nodes--;
271         }
272 
273         return 0;
274 }
275 
276 /*
277  * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
278  * jb_array is the array to be filled in.
279  */
280 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
281                                    struct reiserfs_list_bitmap *jb_array,
282                                    unsigned int bmap_nr)
283 {
284         int i;
285         int failed = 0;
286         struct reiserfs_list_bitmap *jb;
287         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
288 
289         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
290                 jb = jb_array + i;
291                 jb->journal_list = NULL;
292                 jb->bitmaps = vzalloc(mem);
293                 if (!jb->bitmaps) {
294                         reiserfs_warning(sb, "clm-2000", "unable to "
295                                          "allocate bitmaps for journal lists");
296                         failed = 1;
297                         break;
298                 }
299         }
300         if (failed) {
301                 free_list_bitmaps(sb, jb_array);
302                 return -1;
303         }
304         return 0;
305 }
306 
307 /*
308  * find an available list bitmap.  If you can't find one, flush a commit list
309  * and try again
310  */
311 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
312                                                     struct reiserfs_journal_list
313                                                     *jl)
314 {
315         int i, j;
316         struct reiserfs_journal *journal = SB_JOURNAL(sb);
317         struct reiserfs_list_bitmap *jb = NULL;
318 
319         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
320                 i = journal->j_list_bitmap_index;
321                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
322                 jb = journal->j_list_bitmap + i;
323                 if (journal->j_list_bitmap[i].journal_list) {
324                         flush_commit_list(sb,
325                                           journal->j_list_bitmap[i].
326                                           journal_list, 1);
327                         if (!journal->j_list_bitmap[i].journal_list) {
328                                 break;
329                         }
330                 } else {
331                         break;
332                 }
333         }
334         /* double check to make sure if flushed correctly */
335         if (jb->journal_list)
336                 return NULL;
337         jb->journal_list = jl;
338         return jb;
339 }
340 
341 /*
342  * allocates a new chunk of X nodes, and links them all together as a list.
343  * Uses the cnode->next and cnode->prev pointers
344  * returns NULL on failure
345  */
346 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
347 {
348         struct reiserfs_journal_cnode *head;
349         int i;
350         if (num_cnodes <= 0) {
351                 return NULL;
352         }
353         head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
354         if (!head) {
355                 return NULL;
356         }
357         head[0].prev = NULL;
358         head[0].next = head + 1;
359         for (i = 1; i < num_cnodes; i++) {
360                 head[i].prev = head + (i - 1);
361                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
362         }
363         head[num_cnodes - 1].next = NULL;
364         return head;
365 }
366 
367 /* pulls a cnode off the free list, or returns NULL on failure */
368 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
369 {
370         struct reiserfs_journal_cnode *cn;
371         struct reiserfs_journal *journal = SB_JOURNAL(sb);
372 
373         reiserfs_check_lock_depth(sb, "get_cnode");
374 
375         if (journal->j_cnode_free <= 0) {
376                 return NULL;
377         }
378         journal->j_cnode_used++;
379         journal->j_cnode_free--;
380         cn = journal->j_cnode_free_list;
381         if (!cn) {
382                 return cn;
383         }
384         if (cn->next) {
385                 cn->next->prev = NULL;
386         }
387         journal->j_cnode_free_list = cn->next;
388         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
389         return cn;
390 }
391 
392 /*
393  * returns a cnode to the free list
394  */
395 static void free_cnode(struct super_block *sb,
396                        struct reiserfs_journal_cnode *cn)
397 {
398         struct reiserfs_journal *journal = SB_JOURNAL(sb);
399 
400         reiserfs_check_lock_depth(sb, "free_cnode");
401 
402         journal->j_cnode_used--;
403         journal->j_cnode_free++;
404         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
405         cn->next = journal->j_cnode_free_list;
406         if (journal->j_cnode_free_list) {
407                 journal->j_cnode_free_list->prev = cn;
408         }
409         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
410         journal->j_cnode_free_list = cn;
411 }
412 
413 static void clear_prepared_bits(struct buffer_head *bh)
414 {
415         clear_buffer_journal_prepared(bh);
416         clear_buffer_journal_restore_dirty(bh);
417 }
418 
419 /*
420  * return a cnode with same dev, block number and size in table,
421  * or null if not found
422  */
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
443  * search_all, a block can only be allocated if it is not in the current
444  * transaction, was not freed by the current transaction, and has no chance
445  * of ever being overwritten by a replay after crashing.
446  *
447  * If you don't set search_all, a block can only be allocated if it is not
448  * in the current transaction.  Since deleting a block removes it from the
449  * current transaction, this case should never happen.  If you don't set
450  * search_all, make sure you never write the block without logging it.
451  *
452  * next_zero_bit is a suggestion about the next block to try for find_forward.
453  * when bl is rejected because it is set in a journal list bitmap, we search
454  * for the next zero bit in the bitmap that rejected bl.  Then, we return
455  * that through next_zero_bit for find_forward to try.
456  *
457  * Just because we return something in next_zero_bit does not mean we won't
458  * reject it on the next call to reiserfs_in_journal
459  */
460 int reiserfs_in_journal(struct super_block *sb,
461                         unsigned int bmap_nr, int bit_nr, int search_all,
462                         b_blocknr_t * next_zero_bit)
463 {
464         struct reiserfs_journal *journal = SB_JOURNAL(sb);
465         struct reiserfs_journal_cnode *cn;
466         struct reiserfs_list_bitmap *jb;
467         int i;
468         unsigned long bl;
469 
470         *next_zero_bit = 0;     /* always start this at zero. */
471 
472         PROC_INFO_INC(sb, journal.in_journal);
473         /*
474          * If we aren't doing a search_all, this is a metablock, and it
475          * will be logged before use.  if we crash before the transaction
476          * that freed it commits,  this transaction won't have committed
477          * either, and the block will never be written
478          */
479         if (search_all) {
480                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
481                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
482                         jb = journal->j_list_bitmap + i;
483                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
484                             test_bit(bit_nr,
485                                      (unsigned long *)jb->bitmaps[bmap_nr]->
486                                      data)) {
487                                 *next_zero_bit =
488                                     find_next_zero_bit((unsigned long *)
489                                                        (jb->bitmaps[bmap_nr]->
490                                                         data),
491                                                        sb->s_blocksize << 3,
492                                                        bit_nr + 1);
493                                 return 1;
494                         }
495                 }
496         }
497 
498         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
499         /* is it in any old transactions? */
500         if (search_all
501             && (cn =
502                 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
503                 return 1;
504         }
505 
506         /* is it in the current transaction.  This should never happen */
507         if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
508                 BUG();
509                 return 1;
510         }
511 
512         PROC_INFO_INC(sb, journal.in_journal_reusable);
513         /* safe for reuse */
514         return 0;
515 }
516 
517 /* insert cn into table */
518 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
519                                        struct reiserfs_journal_cnode *cn)
520 {
521         struct reiserfs_journal_cnode *cn_orig;
522 
523         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
524         cn->hnext = cn_orig;
525         cn->hprev = NULL;
526         if (cn_orig) {
527                 cn_orig->hprev = cn;
528         }
529         journal_hash(table, cn->sb, cn->blocknr) = cn;
530 }
531 
532 /* lock the current transaction */
533 static inline void lock_journal(struct super_block *sb)
534 {
535         PROC_INFO_INC(sb, journal.lock_journal);
536 
537         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
538 }
539 
540 /* unlock the current transaction */
541 static inline void unlock_journal(struct super_block *sb)
542 {
543         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
544 }
545 
546 static inline void get_journal_list(struct reiserfs_journal_list *jl)
547 {
548         jl->j_refcount++;
549 }
550 
551 static inline void put_journal_list(struct super_block *s,
552                                     struct reiserfs_journal_list *jl)
553 {
554         if (jl->j_refcount < 1) {
555                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
556                                jl->j_trans_id, jl->j_refcount);
557         }
558         if (--jl->j_refcount == 0)
559                 kfree(jl);
560 }
561 
562 /*
563  * this used to be much more involved, and I'm keeping it just in case
564  * things get ugly again.  it gets called by flush_commit_list, and
565  * cleans up any data stored about blocks freed during a transaction.
566  */
567 static void cleanup_freed_for_journal_list(struct super_block *sb,
568                                            struct reiserfs_journal_list *jl)
569 {
570 
571         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
572         if (jb) {
573                 cleanup_bitmap_list(sb, jb);
574         }
575         jl->j_list_bitmap->journal_list = NULL;
576         jl->j_list_bitmap = NULL;
577 }
578 
579 static int journal_list_still_alive(struct super_block *s,
580                                     unsigned int trans_id)
581 {
582         struct reiserfs_journal *journal = SB_JOURNAL(s);
583         struct list_head *entry = &journal->j_journal_list;
584         struct reiserfs_journal_list *jl;
585 
586         if (!list_empty(entry)) {
587                 jl = JOURNAL_LIST_ENTRY(entry->next);
588                 if (jl->j_trans_id <= trans_id) {
589                         return 1;
590                 }
591         }
592         return 0;
593 }
594 
595 /*
596  * If page->mapping was null, we failed to truncate this page for
597  * some reason.  Most likely because it was truncated after being
598  * logged via data=journal.
599  *
600  * This does a check to see if the buffer belongs to one of these
601  * lost pages before doing the final put_bh.  If page->mapping was
602  * null, it tries to free buffers on the page, which should make the
603  * final put_page drop the page from the lru.
604  */
605 static void release_buffer_page(struct buffer_head *bh)
606 {
607         struct page *page = bh->b_page;
608         if (!page->mapping && trylock_page(page)) {
609                 get_page(page);
610                 put_bh(bh);
611                 if (!page->mapping)
612                         try_to_free_buffers(page);
613                 unlock_page(page);
614                 put_page(page);
615         } else {
616                 put_bh(bh);
617         }
618 }
619 
620 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
621 {
622         if (buffer_journaled(bh)) {
623                 reiserfs_warning(NULL, "clm-2084",
624                                  "pinned buffer %lu:%pg sent to disk",
625                                  bh->b_blocknr, bh->b_bdev);
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(REQ_OP_WRITE, 0, 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(REQ_OP_WRITE, 0, 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                         spin_lock(lock);
705                 } else {
706                         fn(chunk);
707                 }
708         }
709         return ret;
710 }
711 
712 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
713 static struct reiserfs_jh *alloc_jh(void)
714 {
715         struct reiserfs_jh *jh;
716         while (1) {
717                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
718                 if (jh) {
719                         atomic_inc(&nr_reiserfs_jh);
720                         return jh;
721                 }
722                 yield();
723         }
724 }
725 
726 /*
727  * we want to free the jh when the buffer has been written
728  * and waited on
729  */
730 void reiserfs_free_jh(struct buffer_head *bh)
731 {
732         struct reiserfs_jh *jh;
733 
734         jh = bh->b_private;
735         if (jh) {
736                 bh->b_private = NULL;
737                 jh->bh = NULL;
738                 list_del_init(&jh->list);
739                 kfree(jh);
740                 if (atomic_read(&nr_reiserfs_jh) <= 0)
741                         BUG();
742                 atomic_dec(&nr_reiserfs_jh);
743                 put_bh(bh);
744         }
745 }
746 
747 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
748                            int tail)
749 {
750         struct reiserfs_jh *jh;
751 
752         if (bh->b_private) {
753                 spin_lock(&j->j_dirty_buffers_lock);
754                 if (!bh->b_private) {
755                         spin_unlock(&j->j_dirty_buffers_lock);
756                         goto no_jh;
757                 }
758                 jh = bh->b_private;
759                 list_del_init(&jh->list);
760         } else {
761 no_jh:
762                 get_bh(bh);
763                 jh = alloc_jh();
764                 spin_lock(&j->j_dirty_buffers_lock);
765                 /*
766                  * buffer must be locked for __add_jh, should be able to have
767                  * two adds at the same time
768                  */
769                 BUG_ON(bh->b_private);
770                 jh->bh = bh;
771                 bh->b_private = jh;
772         }
773         jh->jl = j->j_current_jl;
774         if (tail)
775                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
776         else {
777                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
778         }
779         spin_unlock(&j->j_dirty_buffers_lock);
780         return 0;
781 }
782 
783 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
784 {
785         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
786 }
787 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
788 {
789         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
790 }
791 
792 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
793 static int write_ordered_buffers(spinlock_t * lock,
794                                  struct reiserfs_journal *j,
795                                  struct reiserfs_journal_list *jl,
796                                  struct list_head *list)
797 {
798         struct buffer_head *bh;
799         struct reiserfs_jh *jh;
800         int ret = j->j_errno;
801         struct buffer_chunk chunk;
802         struct list_head tmp;
803         INIT_LIST_HEAD(&tmp);
804 
805         chunk.nr = 0;
806         spin_lock(lock);
807         while (!list_empty(list)) {
808                 jh = JH_ENTRY(list->next);
809                 bh = jh->bh;
810                 get_bh(bh);
811                 if (!trylock_buffer(bh)) {
812                         if (!buffer_dirty(bh)) {
813                                 list_move(&jh->list, &tmp);
814                                 goto loop_next;
815                         }
816                         spin_unlock(lock);
817                         if (chunk.nr)
818                                 write_ordered_chunk(&chunk);
819                         wait_on_buffer(bh);
820                         cond_resched();
821                         spin_lock(lock);
822                         goto loop_next;
823                 }
824                 /*
825                  * in theory, dirty non-uptodate buffers should never get here,
826                  * but the upper layer io error paths still have a few quirks.
827                  * Handle them here as gracefully as we can
828                  */
829                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
830                         clear_buffer_dirty(bh);
831                         ret = -EIO;
832                 }
833                 if (buffer_dirty(bh)) {
834                         list_move(&jh->list, &tmp);
835                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
836                 } else {
837                         reiserfs_free_jh(bh);
838                         unlock_buffer(bh);
839                 }
840 loop_next:
841                 put_bh(bh);
842                 cond_resched_lock(lock);
843         }
844         if (chunk.nr) {
845                 spin_unlock(lock);
846                 write_ordered_chunk(&chunk);
847                 spin_lock(lock);
848         }
849         while (!list_empty(&tmp)) {
850                 jh = JH_ENTRY(tmp.prev);
851                 bh = jh->bh;
852                 get_bh(bh);
853                 reiserfs_free_jh(bh);
854 
855                 if (buffer_locked(bh)) {
856                         spin_unlock(lock);
857                         wait_on_buffer(bh);
858                         spin_lock(lock);
859                 }
860                 if (!buffer_uptodate(bh)) {
861                         ret = -EIO;
862                 }
863                 /*
864                  * ugly interaction with invalidatepage here.
865                  * reiserfs_invalidate_page will pin any buffer that has a
866                  * valid journal head from an older transaction.  If someone
867                  * else sets our buffer dirty after we write it in the first
868                  * loop, and then someone truncates the page away, nobody
869                  * will ever write the buffer. We're safe if we write the
870                  * page one last time after freeing the journal header.
871                  */
872                 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
873                         spin_unlock(lock);
874                         ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
875                         spin_lock(lock);
876                 }
877                 put_bh(bh);
878                 cond_resched_lock(lock);
879         }
880         spin_unlock(lock);
881         return ret;
882 }
883 
884 static int flush_older_commits(struct super_block *s,
885                                struct reiserfs_journal_list *jl)
886 {
887         struct reiserfs_journal *journal = SB_JOURNAL(s);
888         struct reiserfs_journal_list *other_jl;
889         struct reiserfs_journal_list *first_jl;
890         struct list_head *entry;
891         unsigned int trans_id = jl->j_trans_id;
892         unsigned int other_trans_id;
893         unsigned int first_trans_id;
894 
895 find_first:
896         /*
897          * first we walk backwards to find the oldest uncommitted transation
898          */
899         first_jl = jl;
900         entry = jl->j_list.prev;
901         while (1) {
902                 other_jl = JOURNAL_LIST_ENTRY(entry);
903                 if (entry == &journal->j_journal_list ||
904                     atomic_read(&other_jl->j_older_commits_done))
905                         break;
906 
907                 first_jl = other_jl;
908                 entry = other_jl->j_list.prev;
909         }
910 
911         /* if we didn't find any older uncommitted transactions, return now */
912         if (first_jl == jl) {
913                 return 0;
914         }
915 
916         first_trans_id = first_jl->j_trans_id;
917 
918         entry = &first_jl->j_list;
919         while (1) {
920                 other_jl = JOURNAL_LIST_ENTRY(entry);
921                 other_trans_id = other_jl->j_trans_id;
922 
923                 if (other_trans_id < trans_id) {
924                         if (atomic_read(&other_jl->j_commit_left) != 0) {
925                                 flush_commit_list(s, other_jl, 0);
926 
927                                 /* list we were called with is gone, return */
928                                 if (!journal_list_still_alive(s, trans_id))
929                                         return 1;
930 
931                                 /*
932                                  * the one we just flushed is gone, this means
933                                  * all older lists are also gone, so first_jl
934                                  * is no longer valid either.  Go back to the
935                                  * beginning.
936                                  */
937                                 if (!journal_list_still_alive
938                                     (s, other_trans_id)) {
939                                         goto find_first;
940                                 }
941                         }
942                         entry = entry->next;
943                         if (entry == &journal->j_journal_list)
944                                 return 0;
945                 } else {
946                         return 0;
947                 }
948         }
949         return 0;
950 }
951 
952 static int reiserfs_async_progress_wait(struct super_block *s)
953 {
954         struct reiserfs_journal *j = SB_JOURNAL(s);
955 
956         if (atomic_read(&j->j_async_throttle)) {
957                 int depth;
958 
959                 depth = reiserfs_write_unlock_nested(s);
960                 congestion_wait(BLK_RW_ASYNC, HZ / 10);
961                 reiserfs_write_lock_nested(s, depth);
962         }
963 
964         return 0;
965 }
966 
967 /*
968  * if this journal list still has commit blocks unflushed, send them to disk.
969  *
970  * log areas must be flushed in order (transaction 2 can't commit before
971  * transaction 1) Before the commit block can by written, every other log
972  * block must be safely on disk
973  */
974 static int flush_commit_list(struct super_block *s,
975                              struct reiserfs_journal_list *jl, int flushall)
976 {
977         int i;
978         b_blocknr_t bn;
979         struct buffer_head *tbh = NULL;
980         unsigned int trans_id = jl->j_trans_id;
981         struct reiserfs_journal *journal = SB_JOURNAL(s);
982         int retval = 0;
983         int write_len;
984         int depth;
985 
986         reiserfs_check_lock_depth(s, "flush_commit_list");
987 
988         if (atomic_read(&jl->j_older_commits_done)) {
989                 return 0;
990         }
991 
992         /*
993          * before we can put our commit blocks on disk, we have to make
994          * sure everyone older than us is on disk too
995          */
996         BUG_ON(jl->j_len <= 0);
997         BUG_ON(trans_id == journal->j_trans_id);
998 
999         get_journal_list(jl);
1000         if (flushall) {
1001                 if (flush_older_commits(s, jl) == 1) {
1002                         /*
1003                          * list disappeared during flush_older_commits.
1004                          * return
1005                          */
1006                         goto put_jl;
1007                 }
1008         }
1009 
1010         /* make sure nobody is trying to flush this one at the same time */
1011         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1012 
1013         if (!journal_list_still_alive(s, trans_id)) {
1014                 mutex_unlock(&jl->j_commit_mutex);
1015                 goto put_jl;
1016         }
1017         BUG_ON(jl->j_trans_id == 0);
1018 
1019         /* this commit is done, exit */
1020         if (atomic_read(&jl->j_commit_left) <= 0) {
1021                 if (flushall) {
1022                         atomic_set(&jl->j_older_commits_done, 1);
1023                 }
1024                 mutex_unlock(&jl->j_commit_mutex);
1025                 goto put_jl;
1026         }
1027 
1028         if (!list_empty(&jl->j_bh_list)) {
1029                 int ret;
1030 
1031                 /*
1032                  * We might sleep in numerous places inside
1033                  * write_ordered_buffers. Relax the write lock.
1034                  */
1035                 depth = reiserfs_write_unlock_nested(s);
1036                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1037                                             journal, jl, &jl->j_bh_list);
1038                 if (ret < 0 && retval == 0)
1039                         retval = ret;
1040                 reiserfs_write_lock_nested(s, depth);
1041         }
1042         BUG_ON(!list_empty(&jl->j_bh_list));
1043         /*
1044          * for the description block and all the log blocks, submit any buffers
1045          * that haven't already reached the disk.  Try to write at least 256
1046          * log blocks. later on, we will only wait on blocks that correspond
1047          * to this transaction, but while we're unplugging we might as well
1048          * get a chunk of data on there.
1049          */
1050         atomic_inc(&journal->j_async_throttle);
1051         write_len = jl->j_len + 1;
1052         if (write_len < 256)
1053                 write_len = 256;
1054         for (i = 0 ; i < write_len ; i++) {
1055                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1056                     SB_ONDISK_JOURNAL_SIZE(s);
1057                 tbh = journal_find_get_block(s, bn);
1058                 if (tbh) {
1059                         if (buffer_dirty(tbh)) {
1060                             depth = reiserfs_write_unlock_nested(s);
1061                             ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1062                             reiserfs_write_lock_nested(s, depth);
1063                         }
1064                         put_bh(tbh) ;
1065                 }
1066         }
1067         atomic_dec(&journal->j_async_throttle);
1068 
1069         for (i = 0; i < (jl->j_len + 1); i++) {
1070                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1071                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1072                 tbh = journal_find_get_block(s, bn);
1073 
1074                 depth = reiserfs_write_unlock_nested(s);
1075                 __wait_on_buffer(tbh);
1076                 reiserfs_write_lock_nested(s, depth);
1077                 /*
1078                  * since we're using ll_rw_blk above, it might have skipped
1079                  * over a locked buffer.  Double check here
1080                  */
1081                 /* redundant, sync_dirty_buffer() checks */
1082                 if (buffer_dirty(tbh)) {
1083                         depth = reiserfs_write_unlock_nested(s);
1084                         sync_dirty_buffer(tbh);
1085                         reiserfs_write_lock_nested(s, depth);
1086                 }
1087                 if (unlikely(!buffer_uptodate(tbh))) {
1088 #ifdef CONFIG_REISERFS_CHECK
1089                         reiserfs_warning(s, "journal-601",
1090                                          "buffer write failed");
1091 #endif
1092                         retval = -EIO;
1093                 }
1094                 /* once for journal_find_get_block */
1095                 put_bh(tbh);
1096                 /* once due to original getblk in do_journal_end */
1097                 put_bh(tbh);
1098                 atomic_dec(&jl->j_commit_left);
1099         }
1100 
1101         BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1102 
1103         /*
1104          * If there was a write error in the journal - we can't commit
1105          * this transaction - it will be invalid and, if successful,
1106          * will just end up propagating the write error out to
1107          * the file system.
1108          */
1109         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1110                 if (buffer_dirty(jl->j_commit_bh))
1111                         BUG();
1112                 mark_buffer_dirty(jl->j_commit_bh) ;
1113                 depth = reiserfs_write_unlock_nested(s);
1114                 if (reiserfs_barrier_flush(s))
1115                         __sync_dirty_buffer(jl->j_commit_bh,
1116                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1117                 else
1118                         sync_dirty_buffer(jl->j_commit_bh);
1119                 reiserfs_write_lock_nested(s, depth);
1120         }
1121 
1122         /*
1123          * If there was a write error in the journal - we can't commit this
1124          * transaction - it will be invalid and, if successful, will just end
1125          * up propagating the write error out to the filesystem.
1126          */
1127         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1128 #ifdef CONFIG_REISERFS_CHECK
1129                 reiserfs_warning(s, "journal-615", "buffer write failed");
1130 #endif
1131                 retval = -EIO;
1132         }
1133         bforget(jl->j_commit_bh);
1134         if (journal->j_last_commit_id != 0 &&
1135             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1136                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1137                                  journal->j_last_commit_id, jl->j_trans_id);
1138         }
1139         journal->j_last_commit_id = jl->j_trans_id;
1140 
1141         /*
1142          * now, every commit block is on the disk.  It is safe to allow
1143          * blocks freed during this transaction to be reallocated
1144          */
1145         cleanup_freed_for_journal_list(s, jl);
1146 
1147         retval = retval ? retval : journal->j_errno;
1148 
1149         /* mark the metadata dirty */
1150         if (!retval)
1151                 dirty_one_transaction(s, jl);
1152         atomic_dec(&jl->j_commit_left);
1153 
1154         if (flushall) {
1155                 atomic_set(&jl->j_older_commits_done, 1);
1156         }
1157         mutex_unlock(&jl->j_commit_mutex);
1158 put_jl:
1159         put_journal_list(s, jl);
1160 
1161         if (retval)
1162                 reiserfs_abort(s, retval, "Journal write error in %s",
1163                                __func__);
1164         return retval;
1165 }
1166 
1167 /*
1168  * flush_journal_list frequently needs to find a newer transaction for a
1169  * given block.  This does that, or returns NULL if it can't find anything
1170  */
1171 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1172                                                           reiserfs_journal_cnode
1173                                                           *cn)
1174 {
1175         struct super_block *sb = cn->sb;
1176         b_blocknr_t blocknr = cn->blocknr;
1177 
1178         cn = cn->hprev;
1179         while (cn) {
1180                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1181                         return cn->jlist;
1182                 }
1183                 cn = cn->hprev;
1184         }
1185         return NULL;
1186 }
1187 
1188 static void remove_journal_hash(struct super_block *,
1189                                 struct reiserfs_journal_cnode **,
1190                                 struct reiserfs_journal_list *, unsigned long,
1191                                 int);
1192 
1193 /*
1194  * once all the real blocks have been flushed, it is safe to remove them
1195  * from the journal list for this transaction.  Aside from freeing the
1196  * cnode, this also allows the block to be reallocated for data blocks
1197  * if it had been deleted.
1198  */
1199 static void remove_all_from_journal_list(struct super_block *sb,
1200                                          struct reiserfs_journal_list *jl,
1201                                          int debug)
1202 {
1203         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1204         struct reiserfs_journal_cnode *cn, *last;
1205         cn = jl->j_realblock;
1206 
1207         /*
1208          * which is better, to lock once around the whole loop, or
1209          * to lock for each call to remove_journal_hash?
1210          */
1211         while (cn) {
1212                 if (cn->blocknr != 0) {
1213                         if (debug) {
1214                                 reiserfs_warning(sb, "reiserfs-2201",
1215                                                  "block %u, bh is %d, state %ld",
1216                                                  cn->blocknr, cn->bh ? 1 : 0,
1217                                                  cn->state);
1218                         }
1219                         cn->state = 0;
1220                         remove_journal_hash(sb, journal->j_list_hash_table,
1221                                             jl, cn->blocknr, 1);
1222                 }
1223                 last = cn;
1224                 cn = cn->next;
1225                 free_cnode(sb, last);
1226         }
1227         jl->j_realblock = NULL;
1228 }
1229 
1230 /*
1231  * if this timestamp is greater than the timestamp we wrote last to the
1232  * header block, write it to the header block.  once this is done, I can
1233  * safely say the log area for this transaction won't ever be replayed,
1234  * and I can start releasing blocks in this transaction for reuse as data
1235  * blocks.  called by flush_journal_list, before it calls
1236  * remove_all_from_journal_list
1237  */
1238 static int _update_journal_header_block(struct super_block *sb,
1239                                         unsigned long offset,
1240                                         unsigned int trans_id)
1241 {
1242         struct reiserfs_journal_header *jh;
1243         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1244         int depth;
1245 
1246         if (reiserfs_is_journal_aborted(journal))
1247                 return -EIO;
1248 
1249         if (trans_id >= journal->j_last_flush_trans_id) {
1250                 if (buffer_locked((journal->j_header_bh))) {
1251                         depth = reiserfs_write_unlock_nested(sb);
1252                         __wait_on_buffer(journal->j_header_bh);
1253                         reiserfs_write_lock_nested(sb, depth);
1254                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1255 #ifdef CONFIG_REISERFS_CHECK
1256                                 reiserfs_warning(sb, "journal-699",
1257                                                  "buffer write failed");
1258 #endif
1259                                 return -EIO;
1260                         }
1261                 }
1262                 journal->j_last_flush_trans_id = trans_id;
1263                 journal->j_first_unflushed_offset = offset;
1264                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1265                                                         b_data);
1266                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1267                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1268                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1269 
1270                 set_buffer_dirty(journal->j_header_bh);
1271                 depth = reiserfs_write_unlock_nested(sb);
1272 
1273                 if (reiserfs_barrier_flush(sb))
1274                         __sync_dirty_buffer(journal->j_header_bh,
1275                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1276                 else
1277                         sync_dirty_buffer(journal->j_header_bh);
1278 
1279                 reiserfs_write_lock_nested(sb, depth);
1280                 if (!buffer_uptodate(journal->j_header_bh)) {
1281                         reiserfs_warning(sb, "journal-837",
1282                                          "IO error during journal replay");
1283                         return -EIO;
1284                 }
1285         }
1286         return 0;
1287 }
1288 
1289 static int update_journal_header_block(struct super_block *sb,
1290                                        unsigned long offset,
1291                                        unsigned int trans_id)
1292 {
1293         return _update_journal_header_block(sb, offset, trans_id);
1294 }
1295 
1296 /*
1297 ** flush any and all journal lists older than you are
1298 ** can only be called from flush_journal_list
1299 */
1300 static int flush_older_journal_lists(struct super_block *sb,
1301                                      struct reiserfs_journal_list *jl)
1302 {
1303         struct list_head *entry;
1304         struct reiserfs_journal_list *other_jl;
1305         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1306         unsigned int trans_id = jl->j_trans_id;
1307 
1308         /*
1309          * we know we are the only ones flushing things, no extra race
1310          * protection is required.
1311          */
1312 restart:
1313         entry = journal->j_journal_list.next;
1314         /* Did we wrap? */
1315         if (entry == &journal->j_journal_list)
1316                 return 0;
1317         other_jl = JOURNAL_LIST_ENTRY(entry);
1318         if (other_jl->j_trans_id < trans_id) {
1319                 BUG_ON(other_jl->j_refcount <= 0);
1320                 /* do not flush all */
1321                 flush_journal_list(sb, other_jl, 0);
1322 
1323                 /* other_jl is now deleted from the list */
1324                 goto restart;
1325         }
1326         return 0;
1327 }
1328 
1329 static void del_from_work_list(struct super_block *s,
1330                                struct reiserfs_journal_list *jl)
1331 {
1332         struct reiserfs_journal *journal = SB_JOURNAL(s);
1333         if (!list_empty(&jl->j_working_list)) {
1334                 list_del_init(&jl->j_working_list);
1335                 journal->j_num_work_lists--;
1336         }
1337 }
1338 
1339 /*
1340  * flush a journal list, both commit and real blocks
1341  *
1342  * always set flushall to 1, unless you are calling from inside
1343  * flush_journal_list
1344  *
1345  * IMPORTANT.  This can only be called while there are no journal writers,
1346  * and the journal is locked.  That means it can only be called from
1347  * do_journal_end, or by journal_release
1348  */
1349 static int flush_journal_list(struct super_block *s,
1350                               struct reiserfs_journal_list *jl, int flushall)
1351 {
1352         struct reiserfs_journal_list *pjl;
1353         struct reiserfs_journal_cnode *cn, *last;
1354         int count;
1355         int was_jwait = 0;
1356         int was_dirty = 0;
1357         struct buffer_head *saved_bh;
1358         unsigned long j_len_saved = jl->j_len;
1359         struct reiserfs_journal *journal = SB_JOURNAL(s);
1360         int err = 0;
1361         int depth;
1362 
1363         BUG_ON(j_len_saved <= 0);
1364 
1365         if (atomic_read(&journal->j_wcount) != 0) {
1366                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1367                                  atomic_read(&journal->j_wcount));
1368         }
1369 
1370         /* if flushall == 0, the lock is already held */
1371         if (flushall) {
1372                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1373         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1374                 BUG();
1375         }
1376 
1377         count = 0;
1378         if (j_len_saved > journal->j_trans_max) {
1379                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1380                                j_len_saved, jl->j_trans_id);
1381                 return 0;
1382         }
1383 
1384         /* if all the work is already done, get out of here */
1385         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1386             atomic_read(&jl->j_commit_left) <= 0) {
1387                 goto flush_older_and_return;
1388         }
1389 
1390         /*
1391          * start by putting the commit list on disk.  This will also flush
1392          * the commit lists of any olders transactions
1393          */
1394         flush_commit_list(s, jl, 1);
1395 
1396         if (!(jl->j_state & LIST_DIRTY)
1397             && !reiserfs_is_journal_aborted(journal))
1398                 BUG();
1399 
1400         /* are we done now? */
1401         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1402             atomic_read(&jl->j_commit_left) <= 0) {
1403                 goto flush_older_and_return;
1404         }
1405 
1406         /*
1407          * loop through each cnode, see if we need to write it,
1408          * or wait on a more recent transaction, or just ignore it
1409          */
1410         if (atomic_read(&journal->j_wcount) != 0) {
1411                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1412                                "wcount is not 0");
1413         }
1414         cn = jl->j_realblock;
1415         while (cn) {
1416                 was_jwait = 0;
1417                 was_dirty = 0;
1418                 saved_bh = NULL;
1419                 /* blocknr of 0 is no longer in the hash, ignore it */
1420                 if (cn->blocknr == 0) {
1421                         goto free_cnode;
1422                 }
1423 
1424                 /*
1425                  * This transaction failed commit.
1426                  * Don't write out to the disk
1427                  */
1428                 if (!(jl->j_state & LIST_DIRTY))
1429                         goto free_cnode;
1430 
1431                 pjl = find_newer_jl_for_cn(cn);
1432                 /*
1433                  * the order is important here.  We check pjl to make sure we
1434                  * don't clear BH_JDirty_wait if we aren't the one writing this
1435                  * block to disk
1436                  */
1437                 if (!pjl && cn->bh) {
1438                         saved_bh = cn->bh;
1439 
1440                         /*
1441                          * we do this to make sure nobody releases the
1442                          * buffer while we are working with it
1443                          */
1444                         get_bh(saved_bh);
1445 
1446                         if (buffer_journal_dirty(saved_bh)) {
1447                                 BUG_ON(!can_dirty(cn));
1448                                 was_jwait = 1;
1449                                 was_dirty = 1;
1450                         } else if (can_dirty(cn)) {
1451                                 /*
1452                                  * everything with !pjl && jwait
1453                                  * should be writable
1454                                  */
1455                                 BUG();
1456                         }
1457                 }
1458 
1459                 /*
1460                  * if someone has this block in a newer transaction, just make
1461                  * sure they are committed, and don't try writing it to disk
1462                  */
1463                 if (pjl) {
1464                         if (atomic_read(&pjl->j_commit_left))
1465                                 flush_commit_list(s, pjl, 1);
1466                         goto free_cnode;
1467                 }
1468 
1469                 /*
1470                  * bh == NULL when the block got to disk on its own, OR,
1471                  * the block got freed in a future transaction
1472                  */
1473                 if (saved_bh == NULL) {
1474                         goto free_cnode;
1475                 }
1476 
1477                 /*
1478                  * this should never happen.  kupdate_one_transaction has
1479                  * this list locked while it works, so we should never see a
1480                  * buffer here that is not marked JDirty_wait
1481                  */
1482                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1483                         reiserfs_warning(s, "journal-813",
1484                                          "BAD! buffer %llu %cdirty %cjwait, "
1485                                          "not in a newer transaction",
1486                                          (unsigned long long)saved_bh->
1487                                          b_blocknr, was_dirty ? ' ' : '!',
1488                                          was_jwait ? ' ' : '!');
1489                 }
1490                 if (was_dirty) {
1491                         /*
1492                          * we inc again because saved_bh gets decremented
1493                          * at free_cnode
1494                          */
1495                         get_bh(saved_bh);
1496                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1497                         lock_buffer(saved_bh);
1498                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1499                         if (buffer_dirty(saved_bh))
1500                                 submit_logged_buffer(saved_bh);
1501                         else
1502                                 unlock_buffer(saved_bh);
1503                         count++;
1504                 } else {
1505                         reiserfs_warning(s, "clm-2082",
1506                                          "Unable to flush buffer %llu in %s",
1507                                          (unsigned long long)saved_bh->
1508                                          b_blocknr, __func__);
1509                 }
1510 free_cnode:
1511                 last = cn;
1512                 cn = cn->next;
1513                 if (saved_bh) {
1514                         /*
1515                          * we incremented this to keep others from
1516                          * taking the buffer head away
1517                          */
1518                         put_bh(saved_bh);
1519                         if (atomic_read(&saved_bh->b_count) < 0) {
1520                                 reiserfs_warning(s, "journal-945",
1521                                                  "saved_bh->b_count < 0");
1522                         }
1523                 }
1524         }
1525         if (count > 0) {
1526                 cn = jl->j_realblock;
1527                 while (cn) {
1528                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1529                                 if (!cn->bh) {
1530                                         reiserfs_panic(s, "journal-1011",
1531                                                        "cn->bh is NULL");
1532                                 }
1533 
1534                                 depth = reiserfs_write_unlock_nested(s);
1535                                 __wait_on_buffer(cn->bh);
1536                                 reiserfs_write_lock_nested(s, depth);
1537 
1538                                 if (!cn->bh) {
1539                                         reiserfs_panic(s, "journal-1012",
1540                                                        "cn->bh is NULL");
1541                                 }
1542                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1543 #ifdef CONFIG_REISERFS_CHECK
1544                                         reiserfs_warning(s, "journal-949",
1545                                                          "buffer write failed");
1546 #endif
1547                                         err = -EIO;
1548                                 }
1549                                 /*
1550                                  * note, we must clear the JDirty_wait bit
1551                                  * after the up to date check, otherwise we
1552                                  * race against our flushpage routine
1553                                  */
1554                                 BUG_ON(!test_clear_buffer_journal_dirty
1555                                        (cn->bh));
1556 
1557                                 /* drop one ref for us */
1558                                 put_bh(cn->bh);
1559                                 /* drop one ref for journal_mark_dirty */
1560                                 release_buffer_page(cn->bh);
1561                         }
1562                         cn = cn->next;
1563                 }
1564         }
1565 
1566         if (err)
1567                 reiserfs_abort(s, -EIO,
1568                                "Write error while pushing transaction to disk in %s",
1569                                __func__);
1570 flush_older_and_return:
1571 
1572         /*
1573          * before we can update the journal header block, we _must_ flush all
1574          * real blocks from all older transactions to disk.  This is because
1575          * once the header block is updated, this transaction will not be
1576          * replayed after a crash
1577          */
1578         if (flushall) {
1579                 flush_older_journal_lists(s, jl);
1580         }
1581 
1582         err = journal->j_errno;
1583         /*
1584          * before we can remove everything from the hash tables for this
1585          * transaction, we must make sure it can never be replayed
1586          *
1587          * since we are only called from do_journal_end, we know for sure there
1588          * are no allocations going on while we are flushing journal lists.  So,
1589          * we only need to update the journal header block for the last list
1590          * being flushed
1591          */
1592         if (!err && flushall) {
1593                 err =
1594                     update_journal_header_block(s,
1595                                                 (jl->j_start + jl->j_len +
1596                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1597                                                 jl->j_trans_id);
1598                 if (err)
1599                         reiserfs_abort(s, -EIO,
1600                                        "Write error while updating journal header in %s",
1601                                        __func__);
1602         }
1603         remove_all_from_journal_list(s, jl, 0);
1604         list_del_init(&jl->j_list);
1605         journal->j_num_lists--;
1606         del_from_work_list(s, jl);
1607 
1608         if (journal->j_last_flush_id != 0 &&
1609             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1610                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1611                                  journal->j_last_flush_id, jl->j_trans_id);
1612         }
1613         journal->j_last_flush_id = jl->j_trans_id;
1614 
1615         /*
1616          * not strictly required since we are freeing the list, but it should
1617          * help find code using dead lists later on
1618          */
1619         jl->j_len = 0;
1620         atomic_set(&jl->j_nonzerolen, 0);
1621         jl->j_start = 0;
1622         jl->j_realblock = NULL;
1623         jl->j_commit_bh = NULL;
1624         jl->j_trans_id = 0;
1625         jl->j_state = 0;
1626         put_journal_list(s, jl);
1627         if (flushall)
1628                 mutex_unlock(&journal->j_flush_mutex);
1629         return err;
1630 }
1631 
1632 static int write_one_transaction(struct super_block *s,
1633                                  struct reiserfs_journal_list *jl,
1634                                  struct buffer_chunk *chunk)
1635 {
1636         struct reiserfs_journal_cnode *cn;
1637         int ret = 0;
1638 
1639         jl->j_state |= LIST_TOUCHED;
1640         del_from_work_list(s, jl);
1641         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1642                 return 0;
1643         }
1644 
1645         cn = jl->j_realblock;
1646         while (cn) {
1647                 /*
1648                  * if the blocknr == 0, this has been cleared from the hash,
1649                  * skip it
1650                  */
1651                 if (cn->blocknr == 0) {
1652                         goto next;
1653                 }
1654                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1655                         struct buffer_head *tmp_bh;
1656                         /*
1657                          * we can race against journal_mark_freed when we try
1658                          * to lock_buffer(cn->bh), so we have to inc the buffer
1659                          * count, and recheck things after locking
1660                          */
1661                         tmp_bh = cn->bh;
1662                         get_bh(tmp_bh);
1663                         lock_buffer(tmp_bh);
1664                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1665                                 if (!buffer_journal_dirty(tmp_bh) ||
1666                                     buffer_journal_prepared(tmp_bh))
1667                                         BUG();
1668                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1669                                 ret++;
1670                         } else {
1671                                 /* note, cn->bh might be null now */
1672                                 unlock_buffer(tmp_bh);
1673                         }
1674                         put_bh(tmp_bh);
1675                 }
1676 next:
1677                 cn = cn->next;
1678                 cond_resched();
1679         }
1680         return ret;
1681 }
1682 
1683 /* used by flush_commit_list */
1684 static int dirty_one_transaction(struct super_block *s,
1685                                  struct reiserfs_journal_list *jl)
1686 {
1687         struct reiserfs_journal_cnode *cn;
1688         struct reiserfs_journal_list *pjl;
1689         int ret = 0;
1690 
1691         jl->j_state |= LIST_DIRTY;
1692         cn = jl->j_realblock;
1693         while (cn) {
1694                 /*
1695                  * look for a more recent transaction that logged this
1696                  * buffer.  Only the most recent transaction with a buffer in
1697                  * it is allowed to send that buffer to disk
1698                  */
1699                 pjl = find_newer_jl_for_cn(cn);
1700                 if (!pjl && cn->blocknr && cn->bh
1701                     && buffer_journal_dirty(cn->bh)) {
1702                         BUG_ON(!can_dirty(cn));
1703                         /*
1704                          * if the buffer is prepared, it will either be logged
1705                          * or restored.  If restored, we need to make sure
1706                          * it actually gets marked dirty
1707                          */
1708                         clear_buffer_journal_new(cn->bh);
1709                         if (buffer_journal_prepared(cn->bh)) {
1710                                 set_buffer_journal_restore_dirty(cn->bh);
1711                         } else {
1712                                 set_buffer_journal_test(cn->bh);
1713                                 mark_buffer_dirty(cn->bh);
1714                         }
1715                 }
1716                 cn = cn->next;
1717         }
1718         return ret;
1719 }
1720 
1721 static int kupdate_transactions(struct super_block *s,
1722                                 struct reiserfs_journal_list *jl,
1723                                 struct reiserfs_journal_list **next_jl,
1724                                 unsigned int *next_trans_id,
1725                                 int num_blocks, int num_trans)
1726 {
1727         int ret = 0;
1728         int written = 0;
1729         int transactions_flushed = 0;
1730         unsigned int orig_trans_id = jl->j_trans_id;
1731         struct buffer_chunk chunk;
1732         struct list_head *entry;
1733         struct reiserfs_journal *journal = SB_JOURNAL(s);
1734         chunk.nr = 0;
1735 
1736         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1737         if (!journal_list_still_alive(s, orig_trans_id)) {
1738                 goto done;
1739         }
1740 
1741         /*
1742          * we've got j_flush_mutex held, nobody is going to delete any
1743          * of these lists out from underneath us
1744          */
1745         while ((num_trans && transactions_flushed < num_trans) ||
1746                (!num_trans && written < num_blocks)) {
1747 
1748                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1749                     atomic_read(&jl->j_commit_left)
1750                     || !(jl->j_state & LIST_DIRTY)) {
1751                         del_from_work_list(s, jl);
1752                         break;
1753                 }
1754                 ret = write_one_transaction(s, jl, &chunk);
1755 
1756                 if (ret < 0)
1757                         goto done;
1758                 transactions_flushed++;
1759                 written += ret;
1760                 entry = jl->j_list.next;
1761 
1762                 /* did we wrap? */
1763                 if (entry == &journal->j_journal_list) {
1764                         break;
1765                 }
1766                 jl = JOURNAL_LIST_ENTRY(entry);
1767 
1768                 /* don't bother with older transactions */
1769                 if (jl->j_trans_id <= orig_trans_id)
1770                         break;
1771         }
1772         if (chunk.nr) {
1773                 write_chunk(&chunk);
1774         }
1775 
1776 done:
1777         mutex_unlock(&journal->j_flush_mutex);
1778         return ret;
1779 }
1780 
1781 /*
1782  * for o_sync and fsync heavy applications, they tend to use
1783  * all the journa list slots with tiny transactions.  These
1784  * trigger lots and lots of calls to update the header block, which
1785  * adds seeks and slows things down.
1786  *
1787  * This function tries to clear out a large chunk of the journal lists
1788  * at once, which makes everything faster since only the newest journal
1789  * list updates the header block
1790  */
1791 static int flush_used_journal_lists(struct super_block *s,
1792                                     struct reiserfs_journal_list *jl)
1793 {
1794         unsigned long len = 0;
1795         unsigned long cur_len;
1796         int ret;
1797         int i;
1798         int limit = 256;
1799         struct reiserfs_journal_list *tjl;
1800         struct reiserfs_journal_list *flush_jl;
1801         unsigned int trans_id;
1802         struct reiserfs_journal *journal = SB_JOURNAL(s);
1803 
1804         flush_jl = tjl = jl;
1805 
1806         /* in data logging mode, try harder to flush a lot of blocks */
1807         if (reiserfs_data_log(s))
1808                 limit = 1024;
1809         /* flush for 256 transactions or limit blocks, whichever comes first */
1810         for (i = 0; i < 256 && len < limit; i++) {
1811                 if (atomic_read(&tjl->j_commit_left) ||
1812                     tjl->j_trans_id < jl->j_trans_id) {
1813                         break;
1814                 }
1815                 cur_len = atomic_read(&tjl->j_nonzerolen);
1816                 if (cur_len > 0) {
1817                         tjl->j_state &= ~LIST_TOUCHED;
1818                 }
1819                 len += cur_len;
1820                 flush_jl = tjl;
1821                 if (tjl->j_list.next == &journal->j_journal_list)
1822                         break;
1823                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1824         }
1825         get_journal_list(jl);
1826         get_journal_list(flush_jl);
1827 
1828         /*
1829          * try to find a group of blocks we can flush across all the
1830          * transactions, but only bother if we've actually spanned
1831          * across multiple lists
1832          */
1833         if (flush_jl != jl) {
1834                 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1835         }
1836         flush_journal_list(s, flush_jl, 1);
1837         put_journal_list(s, flush_jl);
1838         put_journal_list(s, jl);
1839         return 0;
1840 }
1841 
1842 /*
1843  * removes any nodes in table with name block and dev as bh.
1844  * only touchs the hnext and hprev pointers.
1845  */
1846 void remove_journal_hash(struct super_block *sb,
1847                          struct reiserfs_journal_cnode **table,
1848                          struct reiserfs_journal_list *jl,
1849                          unsigned long block, int remove_freed)
1850 {
1851         struct reiserfs_journal_cnode *cur;
1852         struct reiserfs_journal_cnode **head;
1853 
1854         head = &(journal_hash(table, sb, block));
1855         if (!head) {
1856                 return;
1857         }
1858         cur = *head;
1859         while (cur) {
1860                 if (cur->blocknr == block && cur->sb == sb
1861                     && (jl == NULL || jl == cur->jlist)
1862                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1863                         if (cur->hnext) {
1864                                 cur->hnext->hprev = cur->hprev;
1865                         }
1866                         if (cur->hprev) {
1867                                 cur->hprev->hnext = cur->hnext;
1868                         } else {
1869                                 *head = cur->hnext;
1870                         }
1871                         cur->blocknr = 0;
1872                         cur->sb = NULL;
1873                         cur->state = 0;
1874                         /*
1875                          * anybody who clears the cur->bh will also
1876                          * dec the nonzerolen
1877                          */
1878                         if (cur->bh && cur->jlist)
1879                                 atomic_dec(&cur->jlist->j_nonzerolen);
1880                         cur->bh = NULL;
1881                         cur->jlist = NULL;
1882                 }
1883                 cur = cur->hnext;
1884         }
1885 }
1886 
1887 static void free_journal_ram(struct super_block *sb)
1888 {
1889         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1890         kfree(journal->j_current_jl);
1891         journal->j_num_lists--;
1892 
1893         vfree(journal->j_cnode_free_orig);
1894         free_list_bitmaps(sb, journal->j_list_bitmap);
1895         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1896         if (journal->j_header_bh) {
1897                 brelse(journal->j_header_bh);
1898         }
1899         /*
1900          * j_header_bh is on the journal dev, make sure
1901          * not to release the journal dev until we brelse j_header_bh
1902          */
1903         release_journal_dev(sb, journal);
1904         vfree(journal);
1905 }
1906 
1907 /*
1908  * call on unmount.  Only set error to 1 if you haven't made your way out
1909  * of read_super() yet.  Any other caller must keep error at 0.
1910  */
1911 static int do_journal_release(struct reiserfs_transaction_handle *th,
1912                               struct super_block *sb, int error)
1913 {
1914         struct reiserfs_transaction_handle myth;
1915         int flushed = 0;
1916         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1917 
1918         /*
1919          * we only want to flush out transactions if we were
1920          * called with error == 0
1921          */
1922         if (!error && !sb_rdonly(sb)) {
1923                 /* end the current trans */
1924                 BUG_ON(!th->t_trans_id);
1925                 do_journal_end(th, FLUSH_ALL);
1926 
1927                 /*
1928                  * make sure something gets logged to force
1929                  * our way into the flush code
1930                  */
1931                 if (!journal_join(&myth, sb)) {
1932                         reiserfs_prepare_for_journal(sb,
1933                                                      SB_BUFFER_WITH_SB(sb),
1934                                                      1);
1935                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1936                         do_journal_end(&myth, FLUSH_ALL);
1937                         flushed = 1;
1938                 }
1939         }
1940 
1941         /* this also catches errors during the do_journal_end above */
1942         if (!error && reiserfs_is_journal_aborted(journal)) {
1943                 memset(&myth, 0, sizeof(myth));
1944                 if (!journal_join_abort(&myth, sb)) {
1945                         reiserfs_prepare_for_journal(sb,
1946                                                      SB_BUFFER_WITH_SB(sb),
1947                                                      1);
1948                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1949                         do_journal_end(&myth, FLUSH_ALL);
1950                 }
1951         }
1952 
1953 
1954         /*
1955          * We must release the write lock here because
1956          * the workqueue job (flush_async_commit) needs this lock
1957          */
1958         reiserfs_write_unlock(sb);
1959 
1960         /*
1961          * Cancel flushing of old commits. Note that neither of these works
1962          * will be requeued because superblock is being shutdown and doesn't
1963          * have SB_ACTIVE set.
1964          */
1965         reiserfs_cancel_old_flush(sb);
1966         /* wait for all commits to finish */
1967         cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1968 
1969         free_journal_ram(sb);
1970 
1971         reiserfs_write_lock(sb);
1972 
1973         return 0;
1974 }
1975 
1976 /* * call on unmount.  flush all journal trans, release all alloc'd ram */
1977 int journal_release(struct reiserfs_transaction_handle *th,
1978                     struct super_block *sb)
1979 {
1980         return do_journal_release(th, sb, 0);
1981 }
1982 
1983 /* only call from an error condition inside reiserfs_read_super!  */
1984 int journal_release_error(struct reiserfs_transaction_handle *th,
1985                           struct super_block *sb)
1986 {
1987         return do_journal_release(th, sb, 1);
1988 }
1989 
1990 /*
1991  * compares description block with commit block.
1992  * returns 1 if they differ, 0 if they are the same
1993  */
1994 static int journal_compare_desc_commit(struct super_block *sb,
1995                                        struct reiserfs_journal_desc *desc,
1996                                        struct reiserfs_journal_commit *commit)
1997 {
1998         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1999             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
2000             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
2001             get_commit_trans_len(commit) <= 0) {
2002                 return 1;
2003         }
2004         return 0;
2005 }
2006 
2007 /*
2008  * returns 0 if it did not find a description block
2009  * returns -1 if it found a corrupt commit block
2010  * returns 1 if both desc and commit were valid
2011  * NOTE: only called during fs mount
2012  */
2013 static int journal_transaction_is_valid(struct super_block *sb,
2014                                         struct buffer_head *d_bh,
2015                                         unsigned int *oldest_invalid_trans_id,
2016                                         unsigned long *newest_mount_id)
2017 {
2018         struct reiserfs_journal_desc *desc;
2019         struct reiserfs_journal_commit *commit;
2020         struct buffer_head *c_bh;
2021         unsigned long offset;
2022 
2023         if (!d_bh)
2024                 return 0;
2025 
2026         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2027         if (get_desc_trans_len(desc) > 0
2028             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2029                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2030                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2031                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2032                                        "journal-986: transaction "
2033                                        "is valid returning because trans_id %d is greater than "
2034                                        "oldest_invalid %lu",
2035                                        get_desc_trans_id(desc),
2036                                        *oldest_invalid_trans_id);
2037                         return 0;
2038                 }
2039                 if (newest_mount_id
2040                     && *newest_mount_id > get_desc_mount_id(desc)) {
2041                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2042                                        "journal-1087: transaction "
2043                                        "is valid returning because mount_id %d is less than "
2044                                        "newest_mount_id %lu",
2045                                        get_desc_mount_id(desc),
2046                                        *newest_mount_id);
2047                         return -1;
2048                 }
2049                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2050                         reiserfs_warning(sb, "journal-2018",
2051                                          "Bad transaction length %d "
2052                                          "encountered, ignoring transaction",
2053                                          get_desc_trans_len(desc));
2054                         return -1;
2055                 }
2056                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2057 
2058                 /*
2059                  * ok, we have a journal description block,
2060                  * let's see if the transaction was valid
2061                  */
2062                 c_bh =
2063                     journal_bread(sb,
2064                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2065                                   ((offset + get_desc_trans_len(desc) +
2066                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2067                 if (!c_bh)
2068                         return 0;
2069                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2070                 if (journal_compare_desc_commit(sb, desc, commit)) {
2071                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2072                                        "journal_transaction_is_valid, commit offset %ld had bad "
2073                                        "time %d or length %d",
2074                                        c_bh->b_blocknr -
2075                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2076                                        get_commit_trans_id(commit),
2077                                        get_commit_trans_len(commit));
2078                         brelse(c_bh);
2079                         if (oldest_invalid_trans_id) {
2080                                 *oldest_invalid_trans_id =
2081                                     get_desc_trans_id(desc);
2082                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2083                                                "journal-1004: "
2084                                                "transaction_is_valid setting oldest invalid trans_id "
2085                                                "to %d",
2086                                                get_desc_trans_id(desc));
2087                         }
2088                         return -1;
2089                 }
2090                 brelse(c_bh);
2091                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2092                                "journal-1006: found valid "
2093                                "transaction start offset %llu, len %d id %d",
2094                                d_bh->b_blocknr -
2095                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2096                                get_desc_trans_len(desc),
2097                                get_desc_trans_id(desc));
2098                 return 1;
2099         } else {
2100                 return 0;
2101         }
2102 }
2103 
2104 static void brelse_array(struct buffer_head **heads, int num)
2105 {
2106         int i;
2107         for (i = 0; i < num; i++) {
2108                 brelse(heads[i]);
2109         }
2110 }
2111 
2112 /*
2113  * given the start, and values for the oldest acceptable transactions,
2114  * this either reads in a replays a transaction, or returns because the
2115  * transaction is invalid, or too old.
2116  * NOTE: only called during fs mount
2117  */
2118 static int journal_read_transaction(struct super_block *sb,
2119                                     unsigned long cur_dblock,
2120                                     unsigned long oldest_start,
2121                                     unsigned int oldest_trans_id,
2122                                     unsigned long newest_mount_id)
2123 {
2124         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2125         struct reiserfs_journal_desc *desc;
2126         struct reiserfs_journal_commit *commit;
2127         unsigned int trans_id = 0;
2128         struct buffer_head *c_bh;
2129         struct buffer_head *d_bh;
2130         struct buffer_head **log_blocks = NULL;
2131         struct buffer_head **real_blocks = NULL;
2132         unsigned int trans_offset;
2133         int i;
2134         int trans_half;
2135 
2136         d_bh = journal_bread(sb, cur_dblock);
2137         if (!d_bh)
2138                 return 1;
2139         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2140         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2141         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2142                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2143                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2144                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2145         if (get_desc_trans_id(desc) < oldest_trans_id) {
2146                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2147                                "journal_read_trans skipping because %lu is too old",
2148                                cur_dblock -
2149                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2150                 brelse(d_bh);
2151                 return 1;
2152         }
2153         if (get_desc_mount_id(desc) != newest_mount_id) {
2154                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2155                                "journal_read_trans skipping because %d is != "
2156                                "newest_mount_id %lu", get_desc_mount_id(desc),
2157                                newest_mount_id);
2158                 brelse(d_bh);
2159                 return 1;
2160         }
2161         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2162                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2163                               SB_ONDISK_JOURNAL_SIZE(sb)));
2164         if (!c_bh) {
2165                 brelse(d_bh);
2166                 return 1;
2167         }
2168         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2169         if (journal_compare_desc_commit(sb, desc, commit)) {
2170                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2171                                "journal_read_transaction, "
2172                                "commit offset %llu had bad time %d or length %d",
2173                                c_bh->b_blocknr -
2174                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2175                                get_commit_trans_id(commit),
2176                                get_commit_trans_len(commit));
2177                 brelse(c_bh);
2178                 brelse(d_bh);
2179                 return 1;
2180         }
2181 
2182         if (bdev_read_only(sb->s_bdev)) {
2183                 reiserfs_warning(sb, "clm-2076",
2184                                  "device is readonly, unable to replay log");
2185                 brelse(c_bh);
2186                 brelse(d_bh);
2187                 return -EROFS;
2188         }
2189 
2190         trans_id = get_desc_trans_id(desc);
2191         /*
2192          * now we know we've got a good transaction, and it was
2193          * inside the valid time ranges
2194          */
2195         log_blocks = kmalloc(get_desc_trans_len(desc) *
2196                              sizeof(struct buffer_head *), GFP_NOFS);
2197         real_blocks = kmalloc(get_desc_trans_len(desc) *
2198                               sizeof(struct buffer_head *), GFP_NOFS);
2199         if (!log_blocks || !real_blocks) {
2200                 brelse(c_bh);
2201                 brelse(d_bh);
2202                 kfree(log_blocks);
2203                 kfree(real_blocks);
2204                 reiserfs_warning(sb, "journal-1169",
2205                                  "kmalloc failed, unable to mount FS");
2206                 return -1;
2207         }
2208         /* get all the buffer heads */
2209         trans_half = journal_trans_half(sb->s_blocksize);
2210         for (i = 0; i < get_desc_trans_len(desc); i++) {
2211                 log_blocks[i] =
2212                     journal_getblk(sb,
2213                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2214                                    (trans_offset + 1 +
2215                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2216                 if (i < trans_half) {
2217                         real_blocks[i] =
2218                             sb_getblk(sb,
2219                                       le32_to_cpu(desc->j_realblock[i]));
2220                 } else {
2221                         real_blocks[i] =
2222                             sb_getblk(sb,
2223                                       le32_to_cpu(commit->
2224                                                   j_realblock[i - trans_half]));
2225                 }
2226                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2227                         reiserfs_warning(sb, "journal-1207",
2228                                          "REPLAY FAILURE fsck required! "
2229                                          "Block to replay is outside of "
2230                                          "filesystem");
2231                         goto abort_replay;
2232                 }
2233                 /* make sure we don't try to replay onto log or reserved area */
2234                 if (is_block_in_log_or_reserved_area
2235                     (sb, real_blocks[i]->b_blocknr)) {
2236                         reiserfs_warning(sb, "journal-1204",
2237                                          "REPLAY FAILURE fsck required! "
2238                                          "Trying to replay onto a log block");
2239 abort_replay:
2240                         brelse_array(log_blocks, i);
2241                         brelse_array(real_blocks, i);
2242                         brelse(c_bh);
2243                         brelse(d_bh);
2244                         kfree(log_blocks);
2245                         kfree(real_blocks);
2246                         return -1;
2247                 }
2248         }
2249         /* read in the log blocks, memcpy to the corresponding real block */
2250         ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2251         for (i = 0; i < get_desc_trans_len(desc); i++) {
2252 
2253                 wait_on_buffer(log_blocks[i]);
2254                 if (!buffer_uptodate(log_blocks[i])) {
2255                         reiserfs_warning(sb, "journal-1212",
2256                                          "REPLAY FAILURE fsck required! "
2257                                          "buffer write failed");
2258                         brelse_array(log_blocks + i,
2259                                      get_desc_trans_len(desc) - i);
2260                         brelse_array(real_blocks, get_desc_trans_len(desc));
2261                         brelse(c_bh);
2262                         brelse(d_bh);
2263                         kfree(log_blocks);
2264                         kfree(real_blocks);
2265                         return -1;
2266                 }
2267                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2268                        real_blocks[i]->b_size);
2269                 set_buffer_uptodate(real_blocks[i]);
2270                 brelse(log_blocks[i]);
2271         }
2272         /* flush out the real blocks */
2273         for (i = 0; i < get_desc_trans_len(desc); i++) {
2274                 set_buffer_dirty(real_blocks[i]);
2275                 write_dirty_buffer(real_blocks[i], 0);
2276         }
2277         for (i = 0; i < get_desc_trans_len(desc); i++) {
2278                 wait_on_buffer(real_blocks[i]);
2279                 if (!buffer_uptodate(real_blocks[i])) {
2280                         reiserfs_warning(sb, "journal-1226",
2281                                          "REPLAY FAILURE, fsck required! "
2282                                          "buffer write failed");
2283                         brelse_array(real_blocks + i,
2284                                      get_desc_trans_len(desc) - i);
2285                         brelse(c_bh);
2286                         brelse(d_bh);
2287                         kfree(log_blocks);
2288                         kfree(real_blocks);
2289                         return -1;
2290                 }
2291                 brelse(real_blocks[i]);
2292         }
2293         cur_dblock =
2294             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2295             ((trans_offset + get_desc_trans_len(desc) +
2296               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2297         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2298                        "journal-1095: setting journal " "start to offset %ld",
2299                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2300 
2301         /*
2302          * init starting values for the first transaction, in case
2303          * this is the last transaction to be replayed.
2304          */
2305         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2306         journal->j_last_flush_trans_id = trans_id;
2307         journal->j_trans_id = trans_id + 1;
2308         /* check for trans_id overflow */
2309         if (journal->j_trans_id == 0)
2310                 journal->j_trans_id = 10;
2311         brelse(c_bh);
2312         brelse(d_bh);
2313         kfree(log_blocks);
2314         kfree(real_blocks);
2315         return 0;
2316 }
2317 
2318 /*
2319  * This function reads blocks starting from block and to max_block of bufsize
2320  * size (but no more than BUFNR blocks at a time). This proved to improve
2321  * mounting speed on self-rebuilding raid5 arrays at least.
2322  * Right now it is only used from journal code. But later we might use it
2323  * from other places.
2324  * Note: Do not use journal_getblk/sb_getblk functions here!
2325  */
2326 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2327                                            b_blocknr_t block, int bufsize,
2328                                            b_blocknr_t max_block)
2329 {
2330         struct buffer_head *bhlist[BUFNR];
2331         unsigned int blocks = BUFNR;
2332         struct buffer_head *bh;
2333         int i, j;
2334 
2335         bh = __getblk(dev, block, bufsize);
2336         if (buffer_uptodate(bh))
2337                 return (bh);
2338 
2339         if (block + BUFNR > max_block) {
2340                 blocks = max_block - block;
2341         }
2342         bhlist[0] = bh;
2343         j = 1;
2344         for (i = 1; i < blocks; i++) {
2345                 bh = __getblk(dev, block + i, bufsize);
2346                 if (buffer_uptodate(bh)) {
2347                         brelse(bh);
2348                         break;
2349                 } else
2350                         bhlist[j++] = bh;
2351         }
2352         ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2353         for (i = 1; i < j; i++)
2354                 brelse(bhlist[i]);
2355         bh = bhlist[0];
2356         wait_on_buffer(bh);
2357         if (buffer_uptodate(bh))
2358                 return bh;
2359         brelse(bh);
2360         return NULL;
2361 }
2362 
2363 /*
2364  * read and replay the log
2365  * on a clean unmount, the journal header's next unflushed pointer will be
2366  * to an invalid transaction.  This tests that before finding all the
2367  * transactions in the log, which makes normal mount times fast.
2368  *
2369  * After a crash, this starts with the next unflushed transaction, and
2370  * replays until it finds one too old, or invalid.
2371  *
2372  * On exit, it sets things up so the first transaction will work correctly.
2373  * NOTE: only called during fs mount
2374  */
2375 static int journal_read(struct super_block *sb)
2376 {
2377         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2378         struct reiserfs_journal_desc *desc;
2379         unsigned int oldest_trans_id = 0;
2380         unsigned int oldest_invalid_trans_id = 0;
2381         time_t start;
2382         unsigned long oldest_start = 0;
2383         unsigned long cur_dblock = 0;
2384         unsigned long newest_mount_id = 9;
2385         struct buffer_head *d_bh;
2386         struct reiserfs_journal_header *jh;
2387         int valid_journal_header = 0;
2388         int replay_count = 0;
2389         int continue_replay = 1;
2390         int ret;
2391 
2392         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2393         reiserfs_info(sb, "checking transaction log (%pg)\n",
2394                       journal->j_dev_bd);
2395         start = get_seconds();
2396 
2397         /*
2398          * step 1, read in the journal header block.  Check the transaction
2399          * it says is the first unflushed, and if that transaction is not
2400          * valid, replay is done
2401          */
2402         journal->j_header_bh = journal_bread(sb,
2403                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2404                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2405         if (!journal->j_header_bh) {
2406                 return 1;
2407         }
2408         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2409         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2410             SB_ONDISK_JOURNAL_SIZE(sb)
2411             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2412                 oldest_start =
2413                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2414                     le32_to_cpu(jh->j_first_unflushed_offset);
2415                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2416                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2417                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2418                                "journal-1153: found in "
2419                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2420                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2421                                le32_to_cpu(jh->j_last_flush_trans_id));
2422                 valid_journal_header = 1;
2423 
2424                 /*
2425                  * now, we try to read the first unflushed offset.  If it
2426                  * is not valid, there is nothing more we can do, and it
2427                  * makes no sense to read through the whole log.
2428                  */
2429                 d_bh =
2430                     journal_bread(sb,
2431                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2432                                   le32_to_cpu(jh->j_first_unflushed_offset));
2433                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2434                 if (!ret) {
2435                         continue_replay = 0;
2436                 }
2437                 brelse(d_bh);
2438                 goto start_log_replay;
2439         }
2440 
2441         /*
2442          * ok, there are transactions that need to be replayed.  start
2443          * with the first log block, find all the valid transactions, and
2444          * pick out the oldest.
2445          */
2446         while (continue_replay
2447                && cur_dblock <
2448                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2449                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2450                 /*
2451                  * Note that it is required for blocksize of primary fs
2452                  * device and journal device to be the same
2453                  */
2454                 d_bh =
2455                     reiserfs_breada(journal->j_dev_bd, cur_dblock,
2456                                     sb->s_blocksize,
2457                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2458                                     SB_ONDISK_JOURNAL_SIZE(sb));
2459                 ret =
2460                     journal_transaction_is_valid(sb, d_bh,
2461                                                  &oldest_invalid_trans_id,
2462                                                  &newest_mount_id);
2463                 if (ret == 1) {
2464                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2465                         if (oldest_start == 0) {        /* init all oldest_ values */
2466                                 oldest_trans_id = get_desc_trans_id(desc);
2467                                 oldest_start = d_bh->b_blocknr;
2468                                 newest_mount_id = get_desc_mount_id(desc);
2469                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2470                                                "journal-1179: Setting "
2471                                                "oldest_start to offset %llu, trans_id %lu",
2472                                                oldest_start -
2473                                                SB_ONDISK_JOURNAL_1st_BLOCK
2474                                                (sb), oldest_trans_id);
2475                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2476                                 /* one we just read was older */
2477                                 oldest_trans_id = get_desc_trans_id(desc);
2478                                 oldest_start = d_bh->b_blocknr;
2479                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2480                                                "journal-1180: Resetting "
2481                                                "oldest_start to offset %lu, trans_id %lu",
2482                                                oldest_start -
2483                                                SB_ONDISK_JOURNAL_1st_BLOCK
2484                                                (sb), oldest_trans_id);
2485                         }
2486                         if (newest_mount_id < get_desc_mount_id(desc)) {
2487                                 newest_mount_id = get_desc_mount_id(desc);
2488                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2489                                                "journal-1299: Setting "
2490                                                "newest_mount_id to %d",
2491                                                get_desc_mount_id(desc));
2492                         }
2493                         cur_dblock += get_desc_trans_len(desc) + 2;
2494                 } else {
2495                         cur_dblock++;
2496                 }
2497                 brelse(d_bh);
2498         }
2499 
2500 start_log_replay:
2501         cur_dblock = oldest_start;
2502         if (oldest_trans_id) {
2503                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2504                                "journal-1206: Starting replay "
2505                                "from offset %llu, trans_id %lu",
2506                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2507                                oldest_trans_id);
2508 
2509         }
2510         replay_count = 0;
2511         while (continue_replay && oldest_trans_id > 0) {
2512                 ret =
2513                     journal_read_transaction(sb, cur_dblock, oldest_start,
2514                                              oldest_trans_id, newest_mount_id);
2515                 if (ret < 0) {
2516                         return ret;
2517                 } else if (ret != 0) {
2518                         break;
2519                 }
2520                 cur_dblock =
2521                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2522                 replay_count++;
2523                 if (cur_dblock == oldest_start)
2524                         break;
2525         }
2526 
2527         if (oldest_trans_id == 0) {
2528                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2529                                "journal-1225: No valid " "transactions found");
2530         }
2531         /*
2532          * j_start does not get set correctly if we don't replay any
2533          * transactions.  if we had a valid journal_header, set j_start
2534          * to the first unflushed transaction value, copy the trans_id
2535          * from the header
2536          */
2537         if (valid_journal_header && replay_count == 0) {
2538                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2539                 journal->j_trans_id =
2540                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2541                 /* check for trans_id overflow */
2542                 if (journal->j_trans_id == 0)
2543                         journal->j_trans_id = 10;
2544                 journal->j_last_flush_trans_id =
2545                     le32_to_cpu(jh->j_last_flush_trans_id);
2546                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2547         } else {
2548                 journal->j_mount_id = newest_mount_id + 1;
2549         }
2550         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2551                        "newest_mount_id to %lu", journal->j_mount_id);
2552         journal->j_first_unflushed_offset = journal->j_start;
2553         if (replay_count > 0) {
2554                 reiserfs_info(sb,
2555                               "replayed %d transactions in %lu seconds\n",
2556                               replay_count, get_seconds() - start);
2557         }
2558         /* needed to satisfy the locking in _update_journal_header_block */
2559         reiserfs_write_lock(sb);
2560         if (!bdev_read_only(sb->s_bdev) &&
2561             _update_journal_header_block(sb, journal->j_start,
2562                                          journal->j_last_flush_trans_id)) {
2563                 reiserfs_write_unlock(sb);
2564                 /*
2565                  * replay failed, caller must call free_journal_ram and abort
2566                  * the mount
2567                  */
2568                 return -1;
2569         }
2570         reiserfs_write_unlock(sb);
2571         return 0;
2572 }
2573 
2574 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2575 {
2576         struct reiserfs_journal_list *jl;
2577         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2578                      GFP_NOFS | __GFP_NOFAIL);
2579         INIT_LIST_HEAD(&jl->j_list);
2580         INIT_LIST_HEAD(&jl->j_working_list);
2581         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2582         INIT_LIST_HEAD(&jl->j_bh_list);
2583         mutex_init(&jl->j_commit_mutex);
2584         SB_JOURNAL(s)->j_num_lists++;
2585         get_journal_list(jl);
2586         return jl;
2587 }
2588 
2589 static void journal_list_init(struct super_block *sb)
2590 {
2591         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2592 }
2593 
2594 static void release_journal_dev(struct super_block *super,
2595                                struct reiserfs_journal *journal)
2596 {
2597         if (journal->j_dev_bd != NULL) {
2598                 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2599                 journal->j_dev_bd = NULL;
2600         }
2601 }
2602 
2603 static int journal_init_dev(struct super_block *super,
2604                             struct reiserfs_journal *journal,
2605                             const char *jdev_name)
2606 {
2607         int result;
2608         dev_t jdev;
2609         fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2610         char b[BDEVNAME_SIZE];
2611 
2612         result = 0;
2613 
2614         journal->j_dev_bd = NULL;
2615         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2616             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2617 
2618         if (bdev_read_only(super->s_bdev))
2619                 blkdev_mode = FMODE_READ;
2620 
2621         /* there is no "jdev" option and journal is on separate device */
2622         if ((!jdev_name || !jdev_name[0])) {
2623                 if (jdev == super->s_dev)
2624                         blkdev_mode &= ~FMODE_EXCL;
2625                 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2626                                                       journal);
2627                 journal->j_dev_mode = blkdev_mode;
2628                 if (IS_ERR(journal->j_dev_bd)) {
2629                         result = PTR_ERR(journal->j_dev_bd);
2630                         journal->j_dev_bd = NULL;
2631                         reiserfs_warning(super, "sh-458",
2632                                          "cannot init journal device '%s': %i",
2633                                          __bdevname(jdev, b), result);
2634                         return result;
2635                 } else if (jdev != super->s_dev)
2636                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2637 
2638                 return 0;
2639         }
2640 
2641         journal->j_dev_mode = blkdev_mode;
2642         journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2643         if (IS_ERR(journal->j_dev_bd)) {
2644                 result = PTR_ERR(journal->j_dev_bd);
2645                 journal->j_dev_bd = NULL;
2646                 reiserfs_warning(super,
2647                                  "journal_init_dev: Cannot open '%s': %i",
2648                                  jdev_name, result);
2649                 return result;
2650         }
2651 
2652         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2653         reiserfs_info(super,
2654                       "journal_init_dev: journal device: %pg\n",
2655                       journal->j_dev_bd);
2656         return 0;
2657 }
2658 
2659 /*
2660  * When creating/tuning a file system user can assign some
2661  * journal params within boundaries which depend on the ratio
2662  * blocksize/standard_blocksize.
2663  *
2664  * For blocks >= standard_blocksize transaction size should
2665  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2666  * then JOURNAL_TRANS_MAX_DEFAULT.
2667  *
2668  * For blocks < standard_blocksize these boundaries should be
2669  * decreased proportionally.
2670  */
2671 #define REISERFS_STANDARD_BLKSIZE (4096)
2672 
2673 static int check_advise_trans_params(struct super_block *sb,
2674                                      struct reiserfs_journal *journal)
2675 {
2676         if (journal->j_trans_max) {
2677                 /* Non-default journal params.  Do sanity check for them. */
2678                 int ratio = 1;
2679                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2680                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2681 
2682                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2683                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2684                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2685                     JOURNAL_MIN_RATIO) {
2686                         reiserfs_warning(sb, "sh-462",
2687                                          "bad transaction max size (%u). "
2688                                          "FSCK?", journal->j_trans_max);
2689                         return 1;
2690                 }
2691                 if (journal->j_max_batch != (journal->j_trans_max) *
2692                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2693                         reiserfs_warning(sb, "sh-463",
2694                                          "bad transaction max batch (%u). "
2695                                          "FSCK?", journal->j_max_batch);
2696                         return 1;
2697                 }
2698         } else {
2699                 /*
2700                  * Default journal params.
2701                  * The file system was created by old version
2702                  * of mkreiserfs, so some fields contain zeros,
2703                  * and we need to advise proper values for them
2704                  */
2705                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2706                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2707                                          sb->s_blocksize);
2708                         return 1;
2709                 }
2710                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2711                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2712                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2713         }
2714         return 0;
2715 }
2716 
2717 /* must be called once on fs mount.  calls journal_read for you */
2718 int journal_init(struct super_block *sb, const char *j_dev_name,
2719                  int old_format, unsigned int commit_max_age)
2720 {
2721         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2722         struct buffer_head *bhjh;
2723         struct reiserfs_super_block *rs;
2724         struct reiserfs_journal_header *jh;
2725         struct reiserfs_journal *journal;
2726         struct reiserfs_journal_list *jl;
2727         int ret;
2728 
2729         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2730         if (!journal) {
2731                 reiserfs_warning(sb, "journal-1256",
2732                                  "unable to get memory for journal structure");
2733                 return 1;
2734         }
2735         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2736         INIT_LIST_HEAD(&journal->j_prealloc_list);
2737         INIT_LIST_HEAD(&journal->j_working_list);
2738         INIT_LIST_HEAD(&journal->j_journal_list);
2739         journal->j_persistent_trans = 0;
2740         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2741                                            reiserfs_bmap_count(sb)))
2742                 goto free_and_return;
2743 
2744         allocate_bitmap_nodes(sb);
2745 
2746         /* reserved for journal area support */
2747         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2748                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2749                                                  / sb->s_blocksize +
2750                                                  reiserfs_bmap_count(sb) +
2751                                                  1 :
2752                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2753                                                  sb->s_blocksize + 2);
2754 
2755         /*
2756          * Sanity check to see is the standard journal fitting
2757          * within first bitmap (actual for small blocksizes)
2758          */
2759         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2760             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2761              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2762                 reiserfs_warning(sb, "journal-1393",
2763                                  "journal does not fit for area addressed "
2764                                  "by first of bitmap blocks. It starts at "
2765                                  "%u and its size is %u. Block size %ld",
2766                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2767                                  SB_ONDISK_JOURNAL_SIZE(sb),
2768                                  sb->s_blocksize);
2769                 goto free_and_return;
2770         }
2771 
2772         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2773                 reiserfs_warning(sb, "sh-462",
2774                                  "unable to initialize journal device");
2775                 goto free_and_return;
2776         }
2777 
2778         rs = SB_DISK_SUPER_BLOCK(sb);
2779 
2780         /* read journal header */
2781         bhjh = journal_bread(sb,
2782                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2783                              SB_ONDISK_JOURNAL_SIZE(sb));
2784         if (!bhjh) {
2785                 reiserfs_warning(sb, "sh-459",
2786                                  "unable to read journal header");
2787                 goto free_and_return;
2788         }
2789         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2790 
2791         /* make sure that journal matches to the super block */
2792         if (is_reiserfs_jr(rs)
2793             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2794                 sb_jp_journal_magic(rs))) {
2795                 reiserfs_warning(sb, "sh-460",
2796                                  "journal header magic %x (device %pg) does "
2797                                  "not match to magic found in super block %x",
2798                                  jh->jh_journal.jp_journal_magic,
2799                                  journal->j_dev_bd,
2800                                  sb_jp_journal_magic(rs));
2801                 brelse(bhjh);
2802                 goto free_and_return;
2803         }
2804 
2805         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2806         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2807         journal->j_max_commit_age =
2808             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2809         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2810 
2811         if (check_advise_trans_params(sb, journal) != 0)
2812                 goto free_and_return;
2813         journal->j_default_max_commit_age = journal->j_max_commit_age;
2814 
2815         if (commit_max_age != 0) {
2816                 journal->j_max_commit_age = commit_max_age;
2817                 journal->j_max_trans_age = commit_max_age;
2818         }
2819 
2820         reiserfs_info(sb, "journal params: device %pg, size %u, "
2821                       "journal first block %u, max trans len %u, max batch %u, "
2822                       "max commit age %u, max trans age %u\n",
2823                       journal->j_dev_bd,
2824                       SB_ONDISK_JOURNAL_SIZE(sb),
2825                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2826                       journal->j_trans_max,
2827                       journal->j_max_batch,
2828                       journal->j_max_commit_age, journal->j_max_trans_age);
2829 
2830         brelse(bhjh);
2831 
2832         journal->j_list_bitmap_index = 0;
2833         journal_list_init(sb);
2834 
2835         memset(journal->j_list_hash_table, 0,
2836                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2837 
2838         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2839         spin_lock_init(&journal->j_dirty_buffers_lock);
2840 
2841         journal->j_start = 0;
2842         journal->j_len = 0;
2843         journal->j_len_alloc = 0;
2844         atomic_set(&journal->j_wcount, 0);
2845         atomic_set(&journal->j_async_throttle, 0);
2846         journal->j_bcount = 0;
2847         journal->j_trans_start_time = 0;
2848         journal->j_last = NULL;
2849         journal->j_first = NULL;
2850         init_waitqueue_head(&journal->j_join_wait);
2851         mutex_init(&journal->j_mutex);
2852         mutex_init(&journal->j_flush_mutex);
2853 
2854         journal->j_trans_id = 10;
2855         journal->j_mount_id = 10;
2856         journal->j_state = 0;
2857         atomic_set(&journal->j_jlock, 0);
2858         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2859         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2860         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2861         journal->j_cnode_used = 0;
2862         journal->j_must_wait = 0;
2863 
2864         if (journal->j_cnode_free == 0) {
2865                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2866                                  "allocation failed (%ld bytes). Journal is "
2867                                  "too large for available memory. Usually "
2868                                  "this is due to a journal that is too large.",
2869                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2870                 goto free_and_return;
2871         }
2872 
2873         init_journal_hash(sb);
2874         jl = journal->j_current_jl;
2875 
2876         /*
2877          * get_list_bitmap() may call flush_commit_list() which
2878          * requires the lock. Calling flush_commit_list() shouldn't happen
2879          * this early but I like to be paranoid.
2880          */
2881         reiserfs_write_lock(sb);
2882         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2883         reiserfs_write_unlock(sb);
2884         if (!jl->j_list_bitmap) {
2885                 reiserfs_warning(sb, "journal-2005",
2886                                  "get_list_bitmap failed for journal list 0");
2887                 goto free_and_return;
2888         }
2889 
2890         ret = journal_read(sb);
2891         if (ret < 0) {
2892                 reiserfs_warning(sb, "reiserfs-2006",
2893                                  "Replay Failure, unable to mount");
2894                 goto free_and_return;
2895         }
2896 
2897         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2898         journal->j_work_sb = sb;
2899         return 0;
2900 free_and_return:
2901         free_journal_ram(sb);
2902         return 1;
2903 }
2904 
2905 /*
2906  * test for a polite end of the current transaction.  Used by file_write,
2907  * and should be used by delete to make sure they don't write more than
2908  * can fit inside a single transaction
2909  */
2910 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2911                                    int new_alloc)
2912 {
2913         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2914         time_t now = get_seconds();
2915         /* cannot restart while nested */
2916         BUG_ON(!th->t_trans_id);
2917         if (th->t_refcount > 1)
2918                 return 0;
2919         if (journal->j_must_wait > 0 ||
2920             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2921             atomic_read(&journal->j_jlock) ||
2922             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2923             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2924                 return 1;
2925         }
2926 
2927         journal->j_len_alloc += new_alloc;
2928         th->t_blocks_allocated += new_alloc ;
2929         return 0;
2930 }
2931 
2932 /* this must be called inside a transaction */
2933 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2934 {
2935         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2936         BUG_ON(!th->t_trans_id);
2937         journal->j_must_wait = 1;
2938         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2939         return;
2940 }
2941 
2942 /* this must be called without a transaction started */
2943 void reiserfs_allow_writes(struct super_block *s)
2944 {
2945         struct reiserfs_journal *journal = SB_JOURNAL(s);
2946         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2947         wake_up(&journal->j_join_wait);
2948 }
2949 
2950 /* this must be called without a transaction started */
2951 void reiserfs_wait_on_write_block(struct super_block *s)
2952 {
2953         struct reiserfs_journal *journal = SB_JOURNAL(s);
2954         wait_event(journal->j_join_wait,
2955                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2956 }
2957 
2958 static void queue_log_writer(struct super_block *s)
2959 {
2960         wait_queue_entry_t wait;
2961         struct reiserfs_journal *journal = SB_JOURNAL(s);
2962         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2963 
2964         /*
2965          * we don't want to use wait_event here because
2966          * we only want to wait once.
2967          */
2968         init_waitqueue_entry(&wait, current);
2969         add_wait_queue(&journal->j_join_wait, &wait);
2970         set_current_state(TASK_UNINTERRUPTIBLE);
2971         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2972                 int depth = reiserfs_write_unlock_nested(s);
2973                 schedule();
2974                 reiserfs_write_lock_nested(s, depth);
2975         }
2976         __set_current_state(TASK_RUNNING);
2977         remove_wait_queue(&journal->j_join_wait, &wait);
2978 }
2979 
2980 static void wake_queued_writers(struct super_block *s)
2981 {
2982         struct reiserfs_journal *journal = SB_JOURNAL(s);
2983         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2984                 wake_up(&journal->j_join_wait);
2985 }
2986 
2987 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2988 {
2989         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2990         unsigned long bcount = journal->j_bcount;
2991         while (1) {
2992                 int depth;
2993 
2994                 depth = reiserfs_write_unlock_nested(sb);
2995                 schedule_timeout_uninterruptible(1);
2996                 reiserfs_write_lock_nested(sb, depth);
2997 
2998                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2999                 while ((atomic_read(&journal->j_wcount) > 0 ||
3000                         atomic_read(&journal->j_jlock)) &&
3001                        journal->j_trans_id == trans_id) {
3002                         queue_log_writer(sb);
3003                 }
3004                 if (journal->j_trans_id != trans_id)
3005                         break;
3006                 if (bcount == journal->j_bcount)
3007                         break;
3008                 bcount = journal->j_bcount;
3009         }
3010 }
3011 
3012 /*
3013  * join == true if you must join an existing transaction.
3014  * join == false if you can deal with waiting for others to finish
3015  *
3016  * this will block until the transaction is joinable.  send the number of
3017  * blocks you expect to use in nblocks.
3018 */
3019 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3020                               struct super_block *sb, unsigned long nblocks,
3021                               int join)
3022 {
3023         time_t now = get_seconds();
3024         unsigned int old_trans_id;
3025         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3026         struct reiserfs_transaction_handle myth;
3027         int sched_count = 0;
3028         int retval;
3029         int depth;
3030 
3031         reiserfs_check_lock_depth(sb, "journal_begin");
3032         BUG_ON(nblocks > journal->j_trans_max);
3033 
3034         PROC_INFO_INC(sb, journal.journal_being);
3035         /* set here for journal_join */
3036         th->t_refcount = 1;
3037         th->t_super = sb;
3038 
3039 relock:
3040         lock_journal(sb);
3041         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3042                 unlock_journal(sb);
3043                 retval = journal->j_errno;
3044                 goto out_fail;
3045         }
3046         journal->j_bcount++;
3047 
3048         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3049                 unlock_journal(sb);
3050                 depth = reiserfs_write_unlock_nested(sb);
3051                 reiserfs_wait_on_write_block(sb);
3052                 reiserfs_write_lock_nested(sb, depth);
3053                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3054                 goto relock;
3055         }
3056         now = get_seconds();
3057 
3058         /*
3059          * if there is no room in the journal OR
3060          * if this transaction is too old, and we weren't called joinable,
3061          * wait for it to finish before beginning we don't sleep if there
3062          * aren't other writers
3063          */
3064 
3065         if ((!join && journal->j_must_wait > 0) ||
3066             (!join
3067              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3068             || (!join && atomic_read(&journal->j_wcount) > 0
3069                 && journal->j_trans_start_time > 0
3070                 && (now - journal->j_trans_start_time) >
3071                 journal->j_max_trans_age) || (!join
3072                                               && atomic_read(&journal->j_jlock))
3073             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3074 
3075                 old_trans_id = journal->j_trans_id;
3076                 /* allow others to finish this transaction */
3077                 unlock_journal(sb);
3078 
3079                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3080                     journal->j_max_batch &&
3081                     ((journal->j_len + nblocks + 2) * 100) <
3082                     (journal->j_len_alloc * 75)) {
3083                         if (atomic_read(&journal->j_wcount) > 10) {
3084                                 sched_count++;
3085                                 queue_log_writer(sb);
3086                                 goto relock;
3087                         }
3088                 }
3089                 /*
3090                  * don't mess with joining the transaction if all we
3091                  * have to do is wait for someone else to do a commit
3092                  */
3093                 if (atomic_read(&journal->j_jlock)) {
3094                         while (journal->j_trans_id == old_trans_id &&
3095                                atomic_read(&journal->j_jlock)) {
3096                                 queue_log_writer(sb);
3097                         }
3098                         goto relock;
3099                 }
3100                 retval = journal_join(&myth, sb);
3101                 if (retval)
3102                         goto out_fail;
3103 
3104                 /* someone might have ended the transaction while we joined */
3105                 if (old_trans_id != journal->j_trans_id) {
3106                         retval = do_journal_end(&myth, 0);
3107                 } else {
3108                         retval = do_journal_end(&myth, COMMIT_NOW);
3109                 }
3110 
3111                 if (retval)
3112                         goto out_fail;
3113 
3114                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3115                 goto relock;
3116         }
3117         /* we are the first writer, set trans_id */
3118         if (journal->j_trans_start_time == 0) {
3119                 journal->j_trans_start_time = get_seconds();
3120         }
3121         atomic_inc(&journal->j_wcount);
3122         journal->j_len_alloc += nblocks;
3123         th->t_blocks_logged = 0;
3124         th->t_blocks_allocated = nblocks;
3125         th->t_trans_id = journal->j_trans_id;
3126         unlock_journal(sb);
3127         INIT_LIST_HEAD(&th->t_list);
3128         return 0;
3129 
3130 out_fail:
3131         memset(th, 0, sizeof(*th));
3132         /*
3133          * Re-set th->t_super, so we can properly keep track of how many
3134          * persistent transactions there are. We need to do this so if this
3135          * call is part of a failed restart_transaction, we can free it later
3136          */
3137         th->t_super = sb;
3138         return retval;
3139 }
3140 
3141 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3142                                                                     super_block
3143                                                                     *s,
3144                                                                     int nblocks)
3145 {
3146         int ret;
3147         struct reiserfs_transaction_handle *th;
3148 
3149         /*
3150          * if we're nesting into an existing transaction.  It will be
3151          * persistent on its own
3152          */
3153         if (reiserfs_transaction_running(s)) {
3154                 th = current->journal_info;
3155                 th->t_refcount++;
3156                 BUG_ON(th->t_refcount < 2);
3157 
3158                 return th;
3159         }
3160         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3161         if (!th)
3162                 return NULL;
3163         ret = journal_begin(th, s, nblocks);
3164         if (ret) {
3165                 kfree(th);
3166                 return NULL;
3167         }
3168 
3169         SB_JOURNAL(s)->j_persistent_trans++;
3170         return th;
3171 }
3172 
3173 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3174 {
3175         struct super_block *s = th->t_super;
3176         int ret = 0;
3177         if (th->t_trans_id)
3178                 ret = journal_end(th);
3179         else
3180                 ret = -EIO;
3181         if (th->t_refcount == 0) {
3182                 SB_JOURNAL(s)->j_persistent_trans--;
3183                 kfree(th);
3184         }
3185         return ret;
3186 }
3187 
3188 static int journal_join(struct reiserfs_transaction_handle *th,
3189                         struct super_block *sb)
3190 {
3191         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3192 
3193         /*
3194          * this keeps do_journal_end from NULLing out the
3195          * current->journal_info pointer
3196          */
3197         th->t_handle_save = cur_th;
3198         BUG_ON(cur_th && cur_th->t_refcount > 1);
3199         return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3200 }
3201 
3202 int journal_join_abort(struct reiserfs_transaction_handle *th,
3203                        struct super_block *sb)
3204 {
3205         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3206 
3207         /*
3208          * this keeps do_journal_end from NULLing out the
3209          * current->journal_info pointer
3210          */
3211         th->t_handle_save = cur_th;
3212         BUG_ON(cur_th && cur_th->t_refcount > 1);
3213         return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3214 }
3215 
3216 int journal_begin(struct reiserfs_transaction_handle *th,
3217                   struct super_block *sb, unsigned long nblocks)
3218 {
3219         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3220         int ret;
3221 
3222         th->t_handle_save = NULL;
3223         if (cur_th) {
3224                 /* we are nesting into the current transaction */
3225                 if (cur_th->t_super == sb) {
3226                         BUG_ON(!cur_th->t_refcount);
3227                         cur_th->t_refcount++;
3228                         memcpy(th, cur_th, sizeof(*th));
3229                         if (th->t_refcount <= 1)
3230                                 reiserfs_warning(sb, "reiserfs-2005",
3231                                                  "BAD: refcount <= 1, but "
3232                                                  "journal_info != 0");
3233                         return 0;
3234                 } else {
3235                         /*
3236                          * we've ended up with a handle from a different
3237                          * filesystem.  save it and restore on journal_end.
3238                          * This should never really happen...
3239                          */
3240                         reiserfs_warning(sb, "clm-2100",
3241                                          "nesting info a different FS");
3242                         th->t_handle_save = current->journal_info;
3243                         current->journal_info = th;
3244                 }
3245         } else {
3246                 current->journal_info = th;
3247         }
3248         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3249         BUG_ON(current->journal_info != th);
3250 
3251         /*
3252          * I guess this boils down to being the reciprocal of clm-2100 above.
3253          * If do_journal_begin_r fails, we need to put it back, since
3254          * journal_end won't be called to do it. */
3255         if (ret)
3256                 current->journal_info = th->t_handle_save;
3257         else
3258                 BUG_ON(!th->t_refcount);
3259 
3260         return ret;
3261 }
3262 
3263 /*
3264  * puts bh into the current transaction.  If it was already there, reorders
3265  * removes the old pointers from the hash, and puts new ones in (to make
3266  * sure replay happen in the right order).
3267  *
3268  * if it was dirty, cleans and files onto the clean list.  I can't let it
3269  * be dirty again until the transaction is committed.
3270  *
3271  * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3272  */
3273 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3274                        struct buffer_head *bh)
3275 {
3276         struct super_block *sb = th->t_super;
3277         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3278         struct reiserfs_journal_cnode *cn = NULL;
3279         int count_already_incd = 0;
3280         int prepared = 0;
3281         BUG_ON(!th->t_trans_id);
3282 
3283         PROC_INFO_INC(sb, journal.mark_dirty);
3284         if (th->t_trans_id != journal->j_trans_id) {
3285                 reiserfs_panic(th->t_super, "journal-1577",
3286                                "handle trans id %ld != current trans id %ld",
3287                                th->t_trans_id, journal->j_trans_id);
3288         }
3289 
3290         prepared = test_clear_buffer_journal_prepared(bh);
3291         clear_buffer_journal_restore_dirty(bh);
3292         /* already in this transaction, we are done */
3293         if (buffer_journaled(bh)) {
3294                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3295                 return 0;
3296         }
3297 
3298         /*
3299          * this must be turned into a panic instead of a warning.  We can't
3300          * allow a dirty or journal_dirty or locked buffer to be logged, as
3301          * some changes could get to disk too early.  NOT GOOD.
3302          */
3303         if (!prepared || buffer_dirty(bh)) {
3304                 reiserfs_warning(sb, "journal-1777",
3305                                  "buffer %llu bad state "
3306                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3307                                  (unsigned long long)bh->b_blocknr,
3308                                  prepared ? ' ' : '!',
3309                                  buffer_locked(bh) ? ' ' : '!',
3310                                  buffer_dirty(bh) ? ' ' : '!',
3311                                  buffer_journal_dirty(bh) ? ' ' : '!');
3312         }
3313 
3314         if (atomic_read(&journal->j_wcount) <= 0) {
3315                 reiserfs_warning(sb, "journal-1409",
3316                                  "returning because j_wcount was %d",
3317                                  atomic_read(&journal->j_wcount));
3318                 return 1;
3319         }
3320         /*
3321          * this error means I've screwed up, and we've overflowed
3322          * the transaction.  Nothing can be done here, except make the
3323          * FS readonly or panic.
3324          */
3325         if (journal->j_len >= journal->j_trans_max) {
3326                 reiserfs_panic(th->t_super, "journal-1413",
3327                                "j_len (%lu) is too big",
3328                                journal->j_len);
3329         }
3330 
3331         if (buffer_journal_dirty(bh)) {
3332                 count_already_incd = 1;
3333                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3334                 clear_buffer_journal_dirty(bh);
3335         }
3336 
3337         if (journal->j_len > journal->j_len_alloc) {
3338                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3339         }
3340 
3341         set_buffer_journaled(bh);
3342 
3343         /* now put this guy on the end */
3344         if (!cn) {
3345                 cn = get_cnode(sb);
3346                 if (!cn) {
3347                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3348                 }
3349 
3350                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3351                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3352                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3353                 }
3354                 th->t_blocks_logged++;
3355                 journal->j_len++;
3356 
3357                 cn->bh = bh;
3358                 cn->blocknr = bh->b_blocknr;
3359                 cn->sb = sb;
3360                 cn->jlist = NULL;
3361                 insert_journal_hash(journal->j_hash_table, cn);
3362                 if (!count_already_incd) {
3363                         get_bh(bh);
3364                 }
3365         }
3366         cn->next = NULL;
3367         cn->prev = journal->j_last;
3368         cn->bh = bh;
3369         if (journal->j_last) {
3370                 journal->j_last->next = cn;
3371                 journal->j_last = cn;
3372         } else {
3373                 journal->j_first = cn;
3374                 journal->j_last = cn;
3375         }
3376         reiserfs_schedule_old_flush(sb);
3377         return 0;
3378 }
3379 
3380 int journal_end(struct reiserfs_transaction_handle *th)
3381 {
3382         struct super_block *sb = th->t_super;
3383         if (!current->journal_info && th->t_refcount > 1)
3384                 reiserfs_warning(sb, "REISER-NESTING",
3385                                  "th NULL, refcount %d", th->t_refcount);
3386 
3387         if (!th->t_trans_id) {
3388                 WARN_ON(1);
3389                 return -EIO;
3390         }
3391 
3392         th->t_refcount--;
3393         if (th->t_refcount > 0) {
3394                 struct reiserfs_transaction_handle *cur_th =
3395                     current->journal_info;
3396 
3397                 /*
3398                  * we aren't allowed to close a nested transaction on a
3399                  * different filesystem from the one in the task struct
3400                  */
3401                 BUG_ON(cur_th->t_super != th->t_super);
3402 
3403                 if (th != cur_th) {
3404                         memcpy(current->journal_info, th, sizeof(*th));
3405                         th->t_trans_id = 0;
3406                 }
3407                 return 0;
3408         } else {
3409                 return do_journal_end(th, 0);
3410         }
3411 }
3412 
3413 /*
3414  * removes from the current transaction, relsing and descrementing any counters.
3415  * also files the removed buffer directly onto the clean list
3416  *
3417  * called by journal_mark_freed when a block has been deleted
3418  *
3419  * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3420  */
3421 static int remove_from_transaction(struct super_block *sb,
3422                                    b_blocknr_t blocknr, int already_cleaned)
3423 {
3424         struct buffer_head *bh;
3425         struct reiserfs_journal_cnode *cn;
3426         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3427         int ret = 0;
3428 
3429         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3430         if (!cn || !cn->bh) {
3431                 return ret;
3432         }
3433         bh = cn->bh;
3434         if (cn->prev) {
3435                 cn->prev->next = cn->next;
3436         }
3437         if (cn->next) {
3438                 cn->next->prev = cn->prev;
3439         }
3440         if (cn == journal->j_first) {
3441                 journal->j_first = cn->next;
3442         }
3443         if (cn == journal->j_last) {
3444                 journal->j_last = cn->prev;
3445         }
3446         if (bh)
3447                 remove_journal_hash(sb, journal->j_hash_table, NULL,
3448                                     bh->b_blocknr, 0);
3449         clear_buffer_journaled(bh);     /* don't log this one */
3450 
3451         if (!already_cleaned) {
3452                 clear_buffer_journal_dirty(bh);
3453                 clear_buffer_dirty(bh);
3454                 clear_buffer_journal_test(bh);
3455                 put_bh(bh);
3456                 if (atomic_read(&bh->b_count) < 0) {
3457                         reiserfs_warning(sb, "journal-1752",
3458                                          "b_count < 0");
3459                 }
3460                 ret = 1;
3461         }
3462         journal->j_len--;
3463         journal->j_len_alloc--;
3464         free_cnode(sb, cn);
3465         return ret;
3466 }
3467 
3468 /*
3469  * for any cnode in a journal list, it can only be dirtied of all the
3470  * transactions that include it are committed to disk.
3471  * this checks through each transaction, and returns 1 if you are allowed
3472  * to dirty, and 0 if you aren't
3473  *
3474  * it is called by dirty_journal_list, which is called after
3475  * flush_commit_list has gotten all the log blocks for a given
3476  * transaction on disk
3477  *
3478  */
3479 static int can_dirty(struct reiserfs_journal_cnode *cn)
3480 {
3481         struct super_block *sb = cn->sb;
3482         b_blocknr_t blocknr = cn->blocknr;
3483         struct reiserfs_journal_cnode *cur = cn->hprev;
3484         int can_dirty = 1;
3485 
3486         /*
3487          * first test hprev.  These are all newer than cn, so any node here
3488          * with the same block number and dev means this node can't be sent
3489          * to disk right now.
3490          */
3491         while (cur && can_dirty) {
3492                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3493                     cur->blocknr == blocknr) {
3494                         can_dirty = 0;
3495                 }
3496                 cur = cur->hprev;
3497         }
3498         /*
3499          * then test hnext.  These are all older than cn.  As long as they
3500          * are committed to the log, it is safe to write cn to disk
3501          */
3502         cur = cn->hnext;
3503         while (cur && can_dirty) {
3504                 if (cur->jlist && cur->jlist->j_len > 0 &&
3505                     atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3506                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3507                         can_dirty = 0;
3508                 }
3509                 cur = cur->hnext;
3510         }
3511         return can_dirty;
3512 }
3513 
3514 /*
3515  * syncs the commit blocks, but does not force the real buffers to disk
3516  * will wait until the current transaction is done/committed before returning
3517  */
3518 int journal_end_sync(struct reiserfs_transaction_handle *th)
3519 {
3520         struct super_block *sb = th->t_super;
3521         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3522 
3523         BUG_ON(!th->t_trans_id);
3524         /* you can sync while nested, very, very bad */
3525         BUG_ON(th->t_refcount > 1);
3526         if (journal->j_len == 0) {
3527                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3528                                              1);
3529                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3530         }
3531         return do_journal_end(th, COMMIT_NOW | WAIT);
3532 }
3533 
3534 /* writeback the pending async commits to disk */
3535 static void flush_async_commits(struct work_struct *work)
3536 {
3537         struct reiserfs_journal *journal =
3538                 container_of(work, struct reiserfs_journal, j_work.work);
3539         struct super_block *sb = journal->j_work_sb;
3540         struct reiserfs_journal_list *jl;
3541         struct list_head *entry;
3542 
3543         reiserfs_write_lock(sb);
3544         if (!list_empty(&journal->j_journal_list)) {
3545                 /* last entry is the youngest, commit it and you get everything */
3546                 entry = journal->j_journal_list.prev;
3547                 jl = JOURNAL_LIST_ENTRY(entry);
3548                 flush_commit_list(sb, jl, 1);
3549         }
3550         reiserfs_write_unlock(sb);
3551 }
3552 
3553 /*
3554  * flushes any old transactions to disk
3555  * ends the current transaction if it is too old
3556  */
3557 void reiserfs_flush_old_commits(struct super_block *sb)
3558 {
3559         time_t now;
3560         struct reiserfs_transaction_handle th;
3561         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3562 
3563         now = get_seconds();
3564         /*
3565          * safety check so we don't flush while we are replaying the log during
3566          * mount
3567          */
3568         if (list_empty(&journal->j_journal_list))
3569                 return;
3570 
3571         /*
3572          * check the current transaction.  If there are no writers, and it is
3573          * too old, finish it, and force the commit blocks to disk
3574          */
3575         if (atomic_read(&journal->j_wcount) <= 0 &&
3576             journal->j_trans_start_time > 0 &&
3577             journal->j_len > 0 &&
3578             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3579                 if (!journal_join(&th, sb)) {
3580                         reiserfs_prepare_for_journal(sb,
3581                                                      SB_BUFFER_WITH_SB(sb),
3582                                                      1);
3583                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3584 
3585                         /*
3586                          * we're only being called from kreiserfsd, it makes
3587                          * no sense to do an async commit so that kreiserfsd
3588                          * can do it later
3589                          */
3590                         do_journal_end(&th, COMMIT_NOW | WAIT);
3591                 }
3592         }
3593 }
3594 
3595 /*
3596  * returns 0 if do_journal_end should return right away, returns 1 if
3597  * do_journal_end should finish the commit
3598  *
3599  * if the current transaction is too old, but still has writers, this will
3600  * wait on j_join_wait until all the writers are done.  By the time it
3601  * wakes up, the transaction it was called has already ended, so it just
3602  * flushes the commit list and returns 0.
3603  *
3604  * Won't batch when flush or commit_now is set.  Also won't batch when
3605  * others are waiting on j_join_wait.
3606  *
3607  * Note, we can't allow the journal_end to proceed while there are still
3608  * writers in the log.
3609  */
3610 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3611 {
3612 
3613         time_t now;
3614         int flush = flags & FLUSH_ALL;
3615         int commit_now = flags & COMMIT_NOW;
3616         int wait_on_commit = flags & WAIT;
3617         struct reiserfs_journal_list *jl;
3618         struct super_block *sb = th->t_super;
3619         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3620 
3621         BUG_ON(!th->t_trans_id);
3622 
3623         if (th->t_trans_id != journal->j_trans_id) {
3624                 reiserfs_panic(th->t_super, "journal-1577",
3625                                "handle trans id %ld != current trans id %ld",
3626                                th->t_trans_id, journal->j_trans_id);
3627         }
3628 
3629         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3630         /* <= 0 is allowed.  unmounting might not call begin */
3631         if (atomic_read(&journal->j_wcount) > 0)
3632                 atomic_dec(&journal->j_wcount);
3633 
3634         /*
3635          * BUG, deal with case where j_len is 0, but people previously
3636          * freed blocks need to be released will be dealt with by next
3637          * transaction that actually writes something, but should be taken
3638          * care of in this trans
3639          */
3640         BUG_ON(journal->j_len == 0);
3641 
3642         /*
3643          * if wcount > 0, and we are called to with flush or commit_now,
3644          * we wait on j_join_wait.  We will wake up when the last writer has
3645          * finished the transaction, and started it on its way to the disk.
3646          * Then, we flush the commit or journal list, and just return 0
3647          * because the rest of journal end was already done for this
3648          * transaction.
3649          */
3650         if (atomic_read(&journal->j_wcount) > 0) {
3651                 if (flush || commit_now) {
3652                         unsigned trans_id;
3653 
3654                         jl = journal->j_current_jl;
3655                         trans_id = jl->j_trans_id;
3656                         if (wait_on_commit)
3657                                 jl->j_state |= LIST_COMMIT_PENDING;
3658                         atomic_set(&journal->j_jlock, 1);
3659                         if (flush) {
3660                                 journal->j_next_full_flush = 1;
3661                         }
3662                         unlock_journal(sb);
3663 
3664                         /*
3665                          * sleep while the current transaction is
3666                          * still j_jlocked
3667                          */
3668                         while (journal->j_trans_id == trans_id) {
3669                                 if (atomic_read(&journal->j_jlock)) {
3670                                         queue_log_writer(sb);
3671                                 } else {
3672                                         lock_journal(sb);
3673                                         if (journal->j_trans_id == trans_id) {
3674                                                 atomic_set(&journal->j_jlock,
3675                                                            1);
3676                                         }
3677                                         unlock_journal(sb);
3678                                 }
3679                         }
3680                         BUG_ON(journal->j_trans_id == trans_id);
3681 
3682                         if (commit_now
3683                             && journal_list_still_alive(sb, trans_id)
3684                             && wait_on_commit) {
3685                                 flush_commit_list(sb, jl, 1);
3686                         }
3687                         return 0;
3688                 }
3689                 unlock_journal(sb);
3690                 return 0;
3691         }
3692 
3693         /* deal with old transactions where we are the last writers */
3694         now = get_seconds();
3695         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3696                 commit_now = 1;
3697                 journal->j_next_async_flush = 1;
3698         }
3699         /* don't batch when someone is waiting on j_join_wait */
3700         /* don't batch when syncing the commit or flushing the whole trans */
3701         if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3702             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3703             && journal->j_len_alloc < journal->j_max_batch
3704             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3705                 journal->j_bcount++;
3706                 unlock_journal(sb);
3707                 return 0;
3708         }
3709 
3710         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3711                 reiserfs_panic(sb, "journal-003",
3712                                "j_start (%ld) is too high",
3713                                journal->j_start);
3714         }
3715         return 1;
3716 }
3717 
3718 /*
3719  * Does all the work that makes deleting blocks safe.
3720  * when deleting a block mark BH_JNew, just remove it from the current
3721  * transaction, clean it's buffer_head and move on.
3722  *
3723  * otherwise:
3724  * set a bit for the block in the journal bitmap.  That will prevent it from
3725  * being allocated for unformatted nodes before this transaction has finished.
3726  *
3727  * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3728  * That will prevent any old transactions with this block from trying to flush
3729  * to the real location.  Since we aren't removing the cnode from the
3730  * journal_list_hash, *the block can't be reallocated yet.
3731  *
3732  * Then remove it from the current transaction, decrementing any counters and
3733  * filing it on the clean list.
3734  */
3735 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3736                        struct super_block *sb, b_blocknr_t blocknr)
3737 {
3738         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3739         struct reiserfs_journal_cnode *cn = NULL;
3740         struct buffer_head *bh = NULL;
3741         struct reiserfs_list_bitmap *jb = NULL;
3742         int cleaned = 0;
3743         BUG_ON(!th->t_trans_id);
3744 
3745         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3746         if (cn && cn->bh) {
3747                 bh = cn->bh;
3748                 get_bh(bh);
3749         }
3750         /* if it is journal new, we just remove it from this transaction */
3751         if (bh && buffer_journal_new(bh)) {
3752                 clear_buffer_journal_new(bh);
3753                 clear_prepared_bits(bh);
3754                 reiserfs_clean_and_file_buffer(bh);
3755                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3756         } else {
3757                 /*
3758                  * set the bit for this block in the journal bitmap
3759                  * for this transaction
3760                  */
3761                 jb = journal->j_current_jl->j_list_bitmap;
3762                 if (!jb) {
3763                         reiserfs_panic(sb, "journal-1702",
3764                                        "journal_list_bitmap is NULL");
3765                 }
3766                 set_bit_in_list_bitmap(sb, blocknr, jb);
3767 
3768                 /* Note, the entire while loop is not allowed to schedule.  */
3769 
3770                 if (bh) {
3771                         clear_prepared_bits(bh);
3772                         reiserfs_clean_and_file_buffer(bh);
3773                 }
3774                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3775 
3776                 /*
3777                  * find all older transactions with this block,
3778                  * make sure they don't try to write it out
3779                  */
3780                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3781                                           blocknr);
3782                 while (cn) {
3783                         if (sb == cn->sb && blocknr == cn->blocknr) {
3784                                 set_bit(BLOCK_FREED, &cn->state);
3785                                 if (cn->bh) {
3786                                         /*
3787                                          * remove_from_transaction will brelse
3788                                          * the buffer if it was in the current
3789                                          * trans
3790                                          */
3791                                         if (!cleaned) {
3792                                                 clear_buffer_journal_dirty(cn->
3793                                                                            bh);
3794                                                 clear_buffer_dirty(cn->bh);
3795                                                 clear_buffer_journal_test(cn->
3796                                                                           bh);
3797                                                 cleaned = 1;
3798                                                 put_bh(cn->bh);
3799                                                 if (atomic_read
3800                                                     (&cn->bh->b_count) < 0) {
3801                                                         reiserfs_warning(sb,
3802                                                                  "journal-2138",
3803                                                                  "cn->bh->b_count < 0");
3804                                                 }
3805                                         }
3806                                         /*
3807                                          * since we are clearing the bh,
3808                                          * we MUST dec nonzerolen
3809                                          */
3810                                         if (cn->jlist) {
3811                                                 atomic_dec(&cn->jlist->
3812                                                            j_nonzerolen);
3813                                         }
3814                                         cn->bh = NULL;
3815                                 }
3816                         }
3817                         cn = cn->hnext;
3818                 }
3819         }
3820 
3821         if (bh)
3822                 release_buffer_page(bh); /* get_hash grabs the buffer */
3823         return 0;
3824 }
3825 
3826 void reiserfs_update_inode_transaction(struct inode *inode)
3827 {
3828         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3829         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3830         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3831 }
3832 
3833 /*
3834  * returns -1 on error, 0 if no commits/barriers were done and 1
3835  * if a transaction was actually committed and the barrier was done
3836  */
3837 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3838                              struct reiserfs_journal_list *jl)
3839 {
3840         struct reiserfs_transaction_handle th;
3841         struct super_block *sb = inode->i_sb;
3842         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3843         int ret = 0;
3844 
3845         /*
3846          * is it from the current transaction,
3847          * or from an unknown transaction?
3848          */
3849         if (id == journal->j_trans_id) {
3850                 jl = journal->j_current_jl;
3851                 /*
3852                  * try to let other writers come in and
3853                  * grow this transaction
3854                  */
3855                 let_transaction_grow(sb, id);
3856                 if (journal->j_trans_id != id) {
3857                         goto flush_commit_only;
3858                 }
3859 
3860                 ret = journal_begin(&th, sb, 1);
3861                 if (ret)
3862                         return ret;
3863 
3864                 /* someone might have ended this transaction while we joined */
3865                 if (journal->j_trans_id != id) {
3866                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3867                                                      1);
3868                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3869                         ret = journal_end(&th);
3870                         goto flush_commit_only;
3871                 }
3872 
3873                 ret = journal_end_sync(&th);
3874                 if (!ret)
3875                         ret = 1;
3876 
3877         } else {
3878                 /*
3879                  * this gets tricky, we have to make sure the journal list in
3880                  * the inode still exists.  We know the list is still around
3881                  * if we've got a larger transaction id than the oldest list
3882                  */
3883 flush_commit_only:
3884                 if (journal_list_still_alive(inode->i_sb, id)) {
3885                         /*
3886                          * we only set ret to 1 when we know for sure
3887                          * the barrier hasn't been started yet on the commit
3888                          * block.
3889                          */
3890                         if (atomic_read(&jl->j_commit_left) > 1)
3891                                 ret = 1;
3892                         flush_commit_list(sb, jl, 1);
3893                         if (journal->j_errno)
3894                                 ret = journal->j_errno;
3895                 }
3896         }
3897         /* otherwise the list is gone, and long since committed */
3898         return ret;
3899 }
3900 
3901 int reiserfs_commit_for_inode(struct inode *inode)
3902 {
3903         unsigned int id = REISERFS_I(inode)->i_trans_id;
3904         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3905 
3906         /*
3907          * for the whole inode, assume unset id means it was
3908          * changed in the current transaction.  More conservative
3909          */
3910         if (!id || !jl) {
3911                 reiserfs_update_inode_transaction(inode);
3912                 id = REISERFS_I(inode)->i_trans_id;
3913                 /* jl will be updated in __commit_trans_jl */
3914         }
3915 
3916         return __commit_trans_jl(inode, id, jl);
3917 }
3918 
3919 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3920                                       struct buffer_head *bh)
3921 {
3922         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3923         PROC_INFO_INC(sb, journal.restore_prepared);
3924         if (!bh) {
3925                 return;
3926         }
3927         if (test_clear_buffer_journal_restore_dirty(bh) &&
3928             buffer_journal_dirty(bh)) {
3929                 struct reiserfs_journal_cnode *cn;
3930                 reiserfs_write_lock(sb);
3931                 cn = get_journal_hash_dev(sb,
3932                                           journal->j_list_hash_table,
3933                                           bh->b_blocknr);
3934                 if (cn && can_dirty(cn)) {
3935                         set_buffer_journal_test(bh);
3936                         mark_buffer_dirty(bh);
3937                 }
3938                 reiserfs_write_unlock(sb);
3939         }
3940         clear_buffer_journal_prepared(bh);
3941 }
3942 
3943 extern struct tree_balance *cur_tb;
3944 /*
3945  * before we can change a metadata block, we have to make sure it won't
3946  * be written to disk while we are altering it.  So, we must:
3947  * clean it
3948  * wait on it.
3949  */
3950 int reiserfs_prepare_for_journal(struct super_block *sb,
3951                                  struct buffer_head *bh, int wait)
3952 {
3953         PROC_INFO_INC(sb, journal.prepare);
3954 
3955         if (!trylock_buffer(bh)) {
3956                 if (!wait)
3957                         return 0;
3958                 lock_buffer(bh);
3959         }
3960         set_buffer_journal_prepared(bh);
3961         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3962                 clear_buffer_journal_test(bh);
3963                 set_buffer_journal_restore_dirty(bh);
3964         }
3965         unlock_buffer(bh);
3966         return 1;
3967 }
3968 
3969 /*
3970  * long and ugly.  If flush, will not return until all commit
3971  * blocks and all real buffers in the trans are on disk.
3972  * If no_async, won't return until all commit blocks are on disk.
3973  *
3974  * keep reading, there are comments as you go along
3975  *
3976  * If the journal is aborted, we just clean up. Things like flushing
3977  * journal lists, etc just won't happen.
3978  */
3979 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3980 {
3981         struct super_block *sb = th->t_super;
3982         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3983         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3984         struct reiserfs_journal_cnode *last_cn = NULL;
3985         struct reiserfs_journal_desc *desc;
3986         struct reiserfs_journal_commit *commit;
3987         struct buffer_head *c_bh;       /* commit bh */
3988         struct buffer_head *d_bh;       /* desc bh */
3989         int cur_write_start = 0;        /* start index of current log write */
3990         int old_start;
3991         int i;
3992         int flush;
3993         int wait_on_commit;
3994         struct reiserfs_journal_list *jl, *temp_jl;
3995         struct list_head *entry, *safe;
3996         unsigned long jindex;
3997         unsigned int commit_trans_id;
3998         int trans_half;
3999         int depth;
4000 
4001         BUG_ON(th->t_refcount > 1);
4002         BUG_ON(!th->t_trans_id);
4003         BUG_ON(!th->t_super);
4004 
4005         /*
4006          * protect flush_older_commits from doing mistakes if the
4007          * transaction ID counter gets overflowed.
4008          */
4009         if (th->t_trans_id == ~0U)
4010                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4011         flush = flags & FLUSH_ALL;
4012         wait_on_commit = flags & WAIT;
4013 
4014         current->journal_info = th->t_handle_save;
4015         reiserfs_check_lock_depth(sb, "journal end");
4016         if (journal->j_len == 0) {
4017                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4018                                              1);
4019                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4020         }
4021 
4022         lock_journal(sb);
4023         if (journal->j_next_full_flush) {
4024                 flags |= FLUSH_ALL;
4025                 flush = 1;
4026         }
4027         if (journal->j_next_async_flush) {
4028                 flags |= COMMIT_NOW | WAIT;
4029                 wait_on_commit = 1;
4030         }
4031 
4032         /*
4033          * check_journal_end locks the journal, and unlocks if it does
4034          * not return 1 it tells us if we should continue with the
4035          * journal_end, or just return
4036          */
4037         if (!check_journal_end(th, flags)) {
4038                 reiserfs_schedule_old_flush(sb);
4039                 wake_queued_writers(sb);
4040                 reiserfs_async_progress_wait(sb);
4041                 goto out;
4042         }
4043 
4044         /* check_journal_end might set these, check again */
4045         if (journal->j_next_full_flush) {
4046                 flush = 1;
4047         }
4048 
4049         /*
4050          * j must wait means we have to flush the log blocks, and the
4051          * real blocks for this transaction
4052          */
4053         if (journal->j_must_wait > 0) {
4054                 flush = 1;
4055         }
4056 #ifdef REISERFS_PREALLOCATE
4057         /*
4058          * quota ops might need to nest, setup the journal_info pointer
4059          * for them and raise the refcount so that it is > 0.
4060          */
4061         current->journal_info = th;
4062         th->t_refcount++;
4063 
4064         /* it should not involve new blocks into the transaction */
4065         reiserfs_discard_all_prealloc(th);
4066 
4067         th->t_refcount--;
4068         current->journal_info = th->t_handle_save;
4069 #endif
4070 
4071         /* setup description block */
4072         d_bh =
4073             journal_getblk(sb,
4074                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4075                            journal->j_start);
4076         set_buffer_uptodate(d_bh);
4077         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4078         memset(d_bh->b_data, 0, d_bh->b_size);
4079         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4080         set_desc_trans_id(desc, journal->j_trans_id);
4081 
4082         /*
4083          * setup commit block.  Don't write (keep it clean too) this one
4084          * until after everyone else is written
4085          */
4086         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4087                               ((journal->j_start + journal->j_len +
4088                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4089         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4090         memset(c_bh->b_data, 0, c_bh->b_size);
4091         set_commit_trans_id(commit, journal->j_trans_id);
4092         set_buffer_uptodate(c_bh);
4093 
4094         /* init this journal list */
4095         jl = journal->j_current_jl;
4096 
4097         /*
4098          * we lock the commit before doing anything because
4099          * we want to make sure nobody tries to run flush_commit_list until
4100          * the new transaction is fully setup, and we've already flushed the
4101          * ordered bh list
4102          */
4103         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4104 
4105         /* save the transaction id in case we need to commit it later */
4106         commit_trans_id = jl->j_trans_id;
4107 
4108         atomic_set(&jl->j_older_commits_done, 0);
4109         jl->j_trans_id = journal->j_trans_id;
4110         jl->j_timestamp = journal->j_trans_start_time;
4111         jl->j_commit_bh = c_bh;
4112         jl->j_start = journal->j_start;
4113         jl->j_len = journal->j_len;
4114         atomic_set(&jl->j_nonzerolen, journal->j_len);
4115         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4116         jl->j_realblock = NULL;
4117 
4118         /*
4119          * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4120          * for each real block, add it to the journal list hash,
4121          * copy into real block index array in the commit or desc block
4122          */
4123         trans_half = journal_trans_half(sb->s_blocksize);
4124         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4125                 if (buffer_journaled(cn->bh)) {
4126                         jl_cn = get_cnode(sb);
4127                         if (!jl_cn) {
4128                                 reiserfs_panic(sb, "journal-1676",
4129                                                "get_cnode returned NULL");
4130                         }
4131                         if (i == 0) {
4132                                 jl->j_realblock = jl_cn;
4133                         }
4134                         jl_cn->prev = last_cn;
4135                         jl_cn->next = NULL;
4136                         if (last_cn) {
4137                                 last_cn->next = jl_cn;
4138                         }
4139                         last_cn = jl_cn;
4140                         /*
4141                          * make sure the block we are trying to log
4142                          * is not a block of journal or reserved area
4143                          */
4144                         if (is_block_in_log_or_reserved_area
4145                             (sb, cn->bh->b_blocknr)) {
4146                                 reiserfs_panic(sb, "journal-2332",
4147                                                "Trying to log block %lu, "
4148                                                "which is a log block",
4149                                                cn->bh->b_blocknr);
4150                         }
4151                         jl_cn->blocknr = cn->bh->b_blocknr;
4152                         jl_cn->state = 0;
4153                         jl_cn->sb = sb;
4154                         jl_cn->bh = cn->bh;
4155                         jl_cn->jlist = jl;
4156                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4157                         if (i < trans_half) {
4158                                 desc->j_realblock[i] =
4159                                     cpu_to_le32(cn->bh->b_blocknr);
4160                         } else {
4161                                 commit->j_realblock[i - trans_half] =
4162                                     cpu_to_le32(cn->bh->b_blocknr);
4163                         }
4164                 } else {
4165                         i--;
4166                 }
4167         }
4168         set_desc_trans_len(desc, journal->j_len);
4169         set_desc_mount_id(desc, journal->j_mount_id);
4170         set_desc_trans_id(desc, journal->j_trans_id);
4171         set_commit_trans_len(commit, journal->j_len);
4172 
4173         /*
4174          * special check in case all buffers in the journal
4175          * were marked for not logging
4176          */
4177         BUG_ON(journal->j_len == 0);
4178 
4179         /*
4180          * we're about to dirty all the log blocks, mark the description block
4181          * dirty now too.  Don't mark the commit block dirty until all the
4182          * others are on disk
4183          */
4184         mark_buffer_dirty(d_bh);
4185 
4186         /*
4187          * first data block is j_start + 1, so add one to
4188          * cur_write_start wherever you use it
4189          */
4190         cur_write_start = journal->j_start;
4191         cn = journal->j_first;
4192         jindex = 1;     /* start at one so we don't get the desc again */
4193         while (cn) {
4194                 clear_buffer_journal_new(cn->bh);
4195                 /* copy all the real blocks into log area.  dirty log blocks */
4196                 if (buffer_journaled(cn->bh)) {
4197                         struct buffer_head *tmp_bh;
4198                         char *addr;
4199                         struct page *page;
4200                         tmp_bh =
4201                             journal_getblk(sb,
4202                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4203                                            ((cur_write_start +
4204                                              jindex) %
4205                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4206                         set_buffer_uptodate(tmp_bh);
4207                         page = cn->bh->b_page;
4208                         addr = kmap(page);
4209                         memcpy(tmp_bh->b_data,
4210                                addr + offset_in_page(cn->bh->b_data),
4211                                cn->bh->b_size);
4212                         kunmap(page);
4213                         mark_buffer_dirty(tmp_bh);
4214                         jindex++;
4215                         set_buffer_journal_dirty(cn->bh);
4216                         clear_buffer_journaled(cn->bh);
4217                 } else {
4218                         /*
4219                          * JDirty cleared sometime during transaction.
4220                          * don't log this one
4221                          */
4222                         reiserfs_warning(sb, "journal-2048",
4223                                          "BAD, buffer in journal hash, "
4224                                          "but not JDirty!");
4225                         brelse(cn->bh);
4226                 }
4227                 next = cn->next;
4228                 free_cnode(sb, cn);
4229                 cn = next;
4230                 reiserfs_cond_resched(sb);
4231         }
4232 
4233         /*
4234          * we are done with both the c_bh and d_bh, but
4235          * c_bh must be written after all other commit blocks,
4236          * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4237          */
4238 
4239         journal->j_current_jl = alloc_journal_list(sb);
4240 
4241         /* now it is safe to insert this transaction on the main list */
4242         list_add_tail(&jl->j_list, &journal->j_journal_list);
4243         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4244         journal->j_num_work_lists++;
4245 
4246         /* reset journal values for the next transaction */
4247         old_start = journal->j_start;
4248         journal->j_start =
4249             (journal->j_start + journal->j_len +
4250              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4251         atomic_set(&journal->j_wcount, 0);
4252         journal->j_bcount = 0;
4253         journal->j_last = NULL;
4254         journal->j_first = NULL;
4255         journal->j_len = 0;
4256         journal->j_trans_start_time = 0;
4257         /* check for trans_id overflow */
4258         if (++journal->j_trans_id == 0)
4259                 journal->j_trans_id = 10;
4260         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4261         journal->j_must_wait = 0;
4262         journal->j_len_alloc = 0;
4263         journal->j_next_full_flush = 0;
4264         journal->j_next_async_flush = 0;
4265         init_journal_hash(sb);
4266 
4267         /*
4268          * make sure reiserfs_add_jh sees the new current_jl before we
4269          * write out the tails
4270          */
4271         smp_mb();
4272 
4273         /*
4274          * tail conversion targets have to hit the disk before we end the
4275          * transaction.  Otherwise a later transaction might repack the tail
4276          * before this transaction commits, leaving the data block unflushed
4277          * and clean, if we crash before the later transaction commits, the
4278          * data block is lost.
4279          */
4280         if (!list_empty(&jl->j_tail_bh_list)) {
4281                 depth = reiserfs_write_unlock_nested(sb);
4282                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4283                                       journal, jl, &jl->j_tail_bh_list);
4284                 reiserfs_write_lock_nested(sb, depth);
4285         }
4286         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4287         mutex_unlock(&jl->j_commit_mutex);
4288 
4289         /*
4290          * honor the flush wishes from the caller, simple commits can
4291          * be done outside the journal lock, they are done below
4292          *
4293          * if we don't flush the commit list right now, we put it into
4294          * the work queue so the people waiting on the async progress work
4295          * queue don't wait for this proc to flush journal lists and such.
4296          */
4297         if (flush) {
4298                 flush_commit_list(sb, jl, 1);
4299                 flush_journal_list(sb, jl, 1);
4300         } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4301                 /*
4302                  * Avoid queueing work when sb is being shut down. Transaction
4303                  * will be flushed on journal shutdown.
4304                  */
4305                 if (sb->s_flags & SB_ACTIVE)
4306                         queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4307                                            &journal->j_work, HZ / 10);
4308         }
4309 
4310         /*
4311          * if the next transaction has any chance of wrapping, flush
4312          * transactions that might get overwritten.  If any journal lists
4313          * are very old flush them as well.
4314          */
4315 first_jl:
4316         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4317                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4318                 if (journal->j_start <= temp_jl->j_start) {
4319                         if ((journal->j_start + journal->j_trans_max + 1) >=
4320                             temp_jl->j_start) {
4321                                 flush_used_journal_lists(sb, temp_jl);
4322                                 goto first_jl;
4323                         } else if ((journal->j_start +
4324                                     journal->j_trans_max + 1) <
4325                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4326                                 /*
4327                                  * if we don't cross into the next
4328                                  * transaction and we don't wrap, there is
4329                                  * no way we can overlap any later transactions
4330                                  * break now
4331                                  */
4332                                 break;
4333                         }
4334                 } else if ((journal->j_start +
4335                             journal->j_trans_max + 1) >
4336                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4337                         if (((journal->j_start + journal->j_trans_max + 1) %
4338                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4339                             temp_jl->j_start) {
4340                                 flush_used_journal_lists(sb, temp_jl);
4341                                 goto first_jl;
4342                         } else {
4343                                 /*
4344                                 * we don't overlap anything from out start
4345                                 * to the end of the log, and our wrapped
4346                                 * portion doesn't overlap anything at
4347                                 * the start of the log.  We can break
4348                                 */
4349                                 break;
4350                         }
4351                 }
4352         }
4353 
4354         journal->j_current_jl->j_list_bitmap =
4355             get_list_bitmap(sb, journal->j_current_jl);
4356 
4357         if (!(journal->j_current_jl->j_list_bitmap)) {
4358                 reiserfs_panic(sb, "journal-1996",
4359                                "could not get a list bitmap");
4360         }
4361 
4362         atomic_set(&journal->j_jlock, 0);
4363         unlock_journal(sb);
4364         /* wake up any body waiting to join. */
4365         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4366         wake_up(&journal->j_join_wait);
4367 
4368         if (!flush && wait_on_commit &&
4369             journal_list_still_alive(sb, commit_trans_id)) {
4370                 flush_commit_list(sb, jl, 1);
4371         }
4372 out:
4373         reiserfs_check_lock_depth(sb, "journal end2");
4374 
4375         memset(th, 0, sizeof(*th));
4376         /*
4377          * Re-set th->t_super, so we can properly keep track of how many
4378          * persistent transactions there are. We need to do this so if this
4379          * call is part of a failed restart_transaction, we can free it later
4380          */
4381         th->t_super = sb;
4382 
4383         return journal->j_errno;
4384 }
4385 
4386 /* Send the file system read only and refuse new transactions */
4387 void reiserfs_abort_journal(struct super_block *sb, int errno)
4388 {
4389         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4390         if (test_bit(J_ABORTED, &journal->j_state))
4391                 return;
4392 
4393         if (!journal->j_errno)
4394                 journal->j_errno = errno;
4395 
4396         sb->s_flags |= SB_RDONLY;
4397         set_bit(J_ABORTED, &journal->j_state);
4398 
4399 #ifdef CONFIG_REISERFS_CHECK
4400         dump_stack();
4401 #endif
4402 }
4403 

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