1 // SPDX-License-Identifier: GPL-2.0
3 * Write ahead logging implementation copyright Chris Mason 2000
5 * The background commits make this code very interrelated, and
6 * overly complex. I need to rethink things a bit....The major players:
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.
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.
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.
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
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
34 * -- Note, if you call this as an immediate flush from
35 * within kupdate, it will ignore the immediate flag
38 #include <linux/time.h>
39 #include <linux/semaphore.h>
40 #include <linux/vmalloc.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>
56 /* gets a struct reiserfs_journal_list * from a list head */
57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
60 /* must be correct to keep the desc and commit structs at 4k */
61 #define JOURNAL_TRANS_HALF 1018
62 #define BUFNR 64 /*read ahead */
64 /* cnode stat bits. Move these into reiserfs_fs.h */
66 /* this block was freed, and can't be written. */
68 /* this block was freed during this transaction, and can't be written */
69 #define BLOCK_FREED_HOLDER 3
71 /* used in flush_journal_list */
72 #define BLOCK_NEEDS_FLUSH 4
73 #define BLOCK_DIRTIED 5
75 /* journal list state bits */
76 #define LIST_TOUCHED 1
78 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
80 /* flags for do_journal_end */
81 #define FLUSH_ALL 1 /* flush commit and real blocks */
82 #define COMMIT_NOW 2 /* end and commit this transaction */
83 #define WAIT 4 /* wait for the log blocks to hit the disk */
85 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
86 static int flush_journal_list(struct super_block *s,
87 struct reiserfs_journal_list *jl, int flushall);
88 static int flush_commit_list(struct super_block *s,
89 struct reiserfs_journal_list *jl, int flushall);
90 static int can_dirty(struct reiserfs_journal_cnode *cn);
91 static int journal_join(struct reiserfs_transaction_handle *th,
92 struct super_block *sb);
93 static void release_journal_dev(struct super_block *super,
94 struct reiserfs_journal *journal);
95 static void dirty_one_transaction(struct super_block *s,
96 struct reiserfs_journal_list *jl);
97 static void flush_async_commits(struct work_struct *work);
98 static void queue_log_writer(struct super_block *s);
100 /* values for join in do_journal_begin_r */
102 JBEGIN_REG = 0, /* regular journal begin */
103 /* join the running transaction if at all possible */
105 /* called from cleanup code, ignores aborted flag */
109 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
110 struct super_block *sb,
111 unsigned long nblocks, int join);
113 static void init_journal_hash(struct super_block *sb)
115 struct reiserfs_journal *journal = SB_JOURNAL(sb);
116 memset(journal->j_hash_table, 0,
117 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
121 * clears BH_Dirty and sticks the buffer on the clean list. Called because
122 * I can't allow refile_buffer to make schedule happen after I've freed a
123 * block. Look at remove_from_transaction and journal_mark_freed for
126 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
129 clear_buffer_dirty(bh);
130 clear_buffer_journal_test(bh);
135 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
138 struct reiserfs_bitmap_node *bn;
141 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
145 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
151 INIT_LIST_HEAD(&bn->list);
155 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
157 struct reiserfs_journal *journal = SB_JOURNAL(sb);
158 struct reiserfs_bitmap_node *bn = NULL;
159 struct list_head *entry = journal->j_bitmap_nodes.next;
161 journal->j_used_bitmap_nodes++;
164 if (entry != &journal->j_bitmap_nodes) {
165 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
167 memset(bn->data, 0, sb->s_blocksize);
168 journal->j_free_bitmap_nodes--;
171 bn = allocate_bitmap_node(sb);
178 static inline void free_bitmap_node(struct super_block *sb,
179 struct reiserfs_bitmap_node *bn)
181 struct reiserfs_journal *journal = SB_JOURNAL(sb);
182 journal->j_used_bitmap_nodes--;
183 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
187 list_add(&bn->list, &journal->j_bitmap_nodes);
188 journal->j_free_bitmap_nodes++;
192 static void allocate_bitmap_nodes(struct super_block *sb)
195 struct reiserfs_journal *journal = SB_JOURNAL(sb);
196 struct reiserfs_bitmap_node *bn = NULL;
197 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
198 bn = allocate_bitmap_node(sb);
200 list_add(&bn->list, &journal->j_bitmap_nodes);
201 journal->j_free_bitmap_nodes++;
203 /* this is ok, we'll try again when more are needed */
209 static int set_bit_in_list_bitmap(struct super_block *sb,
211 struct reiserfs_list_bitmap *jb)
213 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
214 unsigned int bit_nr = block % (sb->s_blocksize << 3);
216 if (!jb->bitmaps[bmap_nr]) {
217 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
219 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
223 static void cleanup_bitmap_list(struct super_block *sb,
224 struct reiserfs_list_bitmap *jb)
227 if (jb->bitmaps == NULL)
230 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
231 if (jb->bitmaps[i]) {
232 free_bitmap_node(sb, jb->bitmaps[i]);
233 jb->bitmaps[i] = NULL;
239 * only call this on FS unmount.
241 static int free_list_bitmaps(struct super_block *sb,
242 struct reiserfs_list_bitmap *jb_array)
245 struct reiserfs_list_bitmap *jb;
246 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
248 jb->journal_list = NULL;
249 cleanup_bitmap_list(sb, jb);
256 static int free_bitmap_nodes(struct super_block *sb)
258 struct reiserfs_journal *journal = SB_JOURNAL(sb);
259 struct list_head *next = journal->j_bitmap_nodes.next;
260 struct reiserfs_bitmap_node *bn;
262 while (next != &journal->j_bitmap_nodes) {
263 bn = list_entry(next, struct reiserfs_bitmap_node, list);
267 next = journal->j_bitmap_nodes.next;
268 journal->j_free_bitmap_nodes--;
275 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
276 * jb_array is the array to be filled in.
278 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
279 struct reiserfs_list_bitmap *jb_array,
280 unsigned int bmap_nr)
284 struct reiserfs_list_bitmap *jb;
285 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
287 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
289 jb->journal_list = NULL;
290 jb->bitmaps = vzalloc(mem);
292 reiserfs_warning(sb, "clm-2000", "unable to "
293 "allocate bitmaps for journal lists");
299 free_list_bitmaps(sb, jb_array);
306 * find an available list bitmap. If you can't find one, flush a commit list
309 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
310 struct reiserfs_journal_list
314 struct reiserfs_journal *journal = SB_JOURNAL(sb);
315 struct reiserfs_list_bitmap *jb = NULL;
317 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
318 i = journal->j_list_bitmap_index;
319 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
320 jb = journal->j_list_bitmap + i;
321 if (journal->j_list_bitmap[i].journal_list) {
322 flush_commit_list(sb,
323 journal->j_list_bitmap[i].
325 if (!journal->j_list_bitmap[i].journal_list) {
332 /* double check to make sure if flushed correctly */
333 if (jb->journal_list)
335 jb->journal_list = jl;
340 * allocates a new chunk of X nodes, and links them all together as a list.
341 * Uses the cnode->next and cnode->prev pointers
342 * returns NULL on failure
344 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
346 struct reiserfs_journal_cnode *head;
348 if (num_cnodes <= 0) {
351 head = vzalloc(array_size(num_cnodes,
352 sizeof(struct reiserfs_journal_cnode)));
357 head[0].next = head + 1;
358 for (i = 1; i < num_cnodes; i++) {
359 head[i].prev = head + (i - 1);
360 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
362 head[num_cnodes - 1].next = NULL;
366 /* pulls a cnode off the free list, or returns NULL on failure */
367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
369 struct reiserfs_journal_cnode *cn;
370 struct reiserfs_journal *journal = SB_JOURNAL(sb);
372 reiserfs_check_lock_depth(sb, "get_cnode");
374 if (journal->j_cnode_free <= 0) {
377 journal->j_cnode_used++;
378 journal->j_cnode_free--;
379 cn = journal->j_cnode_free_list;
384 cn->next->prev = NULL;
386 journal->j_cnode_free_list = cn->next;
387 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
392 * returns a cnode to the free list
394 static void free_cnode(struct super_block *sb,
395 struct reiserfs_journal_cnode *cn)
397 struct reiserfs_journal *journal = SB_JOURNAL(sb);
399 reiserfs_check_lock_depth(sb, "free_cnode");
401 journal->j_cnode_used--;
402 journal->j_cnode_free++;
403 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
404 cn->next = journal->j_cnode_free_list;
405 if (journal->j_cnode_free_list) {
406 journal->j_cnode_free_list->prev = cn;
408 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
409 journal->j_cnode_free_list = cn;
412 static void clear_prepared_bits(struct buffer_head *bh)
414 clear_buffer_journal_prepared(bh);
415 clear_buffer_journal_restore_dirty(bh);
419 * return a cnode with same dev, block number and size in table,
420 * or null if not found
422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
426 reiserfs_journal_cnode
430 struct reiserfs_journal_cnode *cn;
431 cn = journal_hash(table, sb, bl);
433 if (cn->blocknr == bl && cn->sb == sb)
437 return (struct reiserfs_journal_cnode *)0;
441 * this actually means 'can this block be reallocated yet?'. If you set
442 * search_all, a block can only be allocated if it is not in the current
443 * transaction, was not freed by the current transaction, and has no chance
444 * of ever being overwritten by a replay after crashing.
446 * If you don't set search_all, a block can only be allocated if it is not
447 * in the current transaction. Since deleting a block removes it from the
448 * current transaction, this case should never happen. If you don't set
449 * search_all, make sure you never write the block without logging it.
451 * next_zero_bit is a suggestion about the next block to try for find_forward.
452 * when bl is rejected because it is set in a journal list bitmap, we search
453 * for the next zero bit in the bitmap that rejected bl. Then, we return
454 * that through next_zero_bit for find_forward to try.
456 * Just because we return something in next_zero_bit does not mean we won't
457 * reject it on the next call to reiserfs_in_journal
459 int reiserfs_in_journal(struct super_block *sb,
460 unsigned int bmap_nr, int bit_nr, int search_all,
461 b_blocknr_t * next_zero_bit)
463 struct reiserfs_journal *journal = SB_JOURNAL(sb);
464 struct reiserfs_list_bitmap *jb;
468 *next_zero_bit = 0; /* always start this at zero. */
470 PROC_INFO_INC(sb, journal.in_journal);
472 * If we aren't doing a search_all, this is a metablock, and it
473 * will be logged before use. if we crash before the transaction
474 * that freed it commits, this transaction won't have committed
475 * either, and the block will never be written
478 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
479 PROC_INFO_INC(sb, journal.in_journal_bitmap);
480 jb = journal->j_list_bitmap + i;
481 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
483 (unsigned long *)jb->bitmaps[bmap_nr]->
486 find_next_zero_bit((unsigned long *)
487 (jb->bitmaps[bmap_nr]->
489 sb->s_blocksize << 3,
496 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
497 /* is it in any old transactions? */
499 && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
503 /* is it in the current transaction. This should never happen */
504 if ((get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
509 PROC_INFO_INC(sb, journal.in_journal_reusable);
514 /* insert cn into table */
515 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
516 struct reiserfs_journal_cnode *cn)
518 struct reiserfs_journal_cnode *cn_orig;
520 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
526 journal_hash(table, cn->sb, cn->blocknr) = cn;
529 /* lock the current transaction */
530 static inline void lock_journal(struct super_block *sb)
532 PROC_INFO_INC(sb, journal.lock_journal);
534 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
537 /* unlock the current transaction */
538 static inline void unlock_journal(struct super_block *sb)
540 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
543 static inline void get_journal_list(struct reiserfs_journal_list *jl)
548 static inline void put_journal_list(struct super_block *s,
549 struct reiserfs_journal_list *jl)
551 if (jl->j_refcount < 1) {
552 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
553 jl->j_trans_id, jl->j_refcount);
555 if (--jl->j_refcount == 0)
560 * this used to be much more involved, and I'm keeping it just in case
561 * things get ugly again. it gets called by flush_commit_list, and
562 * cleans up any data stored about blocks freed during a transaction.
564 static void cleanup_freed_for_journal_list(struct super_block *sb,
565 struct reiserfs_journal_list *jl)
568 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
570 cleanup_bitmap_list(sb, jb);
572 jl->j_list_bitmap->journal_list = NULL;
573 jl->j_list_bitmap = NULL;
576 static int journal_list_still_alive(struct super_block *s,
577 unsigned int trans_id)
579 struct reiserfs_journal *journal = SB_JOURNAL(s);
580 struct list_head *entry = &journal->j_journal_list;
581 struct reiserfs_journal_list *jl;
583 if (!list_empty(entry)) {
584 jl = JOURNAL_LIST_ENTRY(entry->next);
585 if (jl->j_trans_id <= trans_id) {
593 * If page->mapping was null, we failed to truncate this page for
594 * some reason. Most likely because it was truncated after being
595 * logged via data=journal.
597 * This does a check to see if the buffer belongs to one of these
598 * lost pages before doing the final put_bh. If page->mapping was
599 * null, it tries to free buffers on the page, which should make the
600 * final put_page drop the page from the lru.
602 static void release_buffer_page(struct buffer_head *bh)
604 struct page *page = bh->b_page;
605 if (!page->mapping && trylock_page(page)) {
609 try_to_free_buffers(page);
617 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
619 if (buffer_journaled(bh)) {
620 reiserfs_warning(NULL, "clm-2084",
621 "pinned buffer %lu:%pg sent to disk",
622 bh->b_blocknr, bh->b_bdev);
625 set_buffer_uptodate(bh);
627 clear_buffer_uptodate(bh);
630 release_buffer_page(bh);
633 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
636 set_buffer_uptodate(bh);
638 clear_buffer_uptodate(bh);
643 static void submit_logged_buffer(struct buffer_head *bh)
646 bh->b_end_io = reiserfs_end_buffer_io_sync;
647 clear_buffer_journal_new(bh);
648 clear_buffer_dirty(bh);
649 if (!test_clear_buffer_journal_test(bh))
651 if (!buffer_uptodate(bh))
653 submit_bh(REQ_OP_WRITE, 0, bh);
656 static void submit_ordered_buffer(struct buffer_head *bh)
659 bh->b_end_io = reiserfs_end_ordered_io;
660 clear_buffer_dirty(bh);
661 if (!buffer_uptodate(bh))
663 submit_bh(REQ_OP_WRITE, 0, bh);
666 #define CHUNK_SIZE 32
667 struct buffer_chunk {
668 struct buffer_head *bh[CHUNK_SIZE];
672 static void write_chunk(struct buffer_chunk *chunk)
675 for (i = 0; i < chunk->nr; i++) {
676 submit_logged_buffer(chunk->bh[i]);
681 static void write_ordered_chunk(struct buffer_chunk *chunk)
684 for (i = 0; i < chunk->nr; i++) {
685 submit_ordered_buffer(chunk->bh[i]);
690 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
691 spinlock_t * lock, void (fn) (struct buffer_chunk *))
694 BUG_ON(chunk->nr >= CHUNK_SIZE);
695 chunk->bh[chunk->nr++] = bh;
696 if (chunk->nr >= CHUNK_SIZE) {
709 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
710 static struct reiserfs_jh *alloc_jh(void)
712 struct reiserfs_jh *jh;
714 jh = kmalloc(sizeof(*jh), GFP_NOFS);
716 atomic_inc(&nr_reiserfs_jh);
724 * we want to free the jh when the buffer has been written
727 void reiserfs_free_jh(struct buffer_head *bh)
729 struct reiserfs_jh *jh;
733 bh->b_private = NULL;
735 list_del_init(&jh->list);
737 if (atomic_read(&nr_reiserfs_jh) <= 0)
739 atomic_dec(&nr_reiserfs_jh);
744 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
747 struct reiserfs_jh *jh;
750 spin_lock(&j->j_dirty_buffers_lock);
751 if (!bh->b_private) {
752 spin_unlock(&j->j_dirty_buffers_lock);
756 list_del_init(&jh->list);
761 spin_lock(&j->j_dirty_buffers_lock);
763 * buffer must be locked for __add_jh, should be able to have
764 * two adds at the same time
766 BUG_ON(bh->b_private);
770 jh->jl = j->j_current_jl;
772 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
774 list_add_tail(&jh->list, &jh->jl->j_bh_list);
776 spin_unlock(&j->j_dirty_buffers_lock);
780 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
782 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
784 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
789 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
790 static int write_ordered_buffers(spinlock_t * lock,
791 struct reiserfs_journal *j,
792 struct reiserfs_journal_list *jl,
793 struct list_head *list)
795 struct buffer_head *bh;
796 struct reiserfs_jh *jh;
797 int ret = j->j_errno;
798 struct buffer_chunk chunk;
799 struct list_head tmp;
800 INIT_LIST_HEAD(&tmp);
804 while (!list_empty(list)) {
805 jh = JH_ENTRY(list->next);
808 if (!trylock_buffer(bh)) {
809 if (!buffer_dirty(bh)) {
810 list_move(&jh->list, &tmp);
815 write_ordered_chunk(&chunk);
822 * in theory, dirty non-uptodate buffers should never get here,
823 * but the upper layer io error paths still have a few quirks.
824 * Handle them here as gracefully as we can
826 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
827 clear_buffer_dirty(bh);
830 if (buffer_dirty(bh)) {
831 list_move(&jh->list, &tmp);
832 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
834 reiserfs_free_jh(bh);
839 cond_resched_lock(lock);
843 write_ordered_chunk(&chunk);
846 while (!list_empty(&tmp)) {
847 jh = JH_ENTRY(tmp.prev);
850 reiserfs_free_jh(bh);
852 if (buffer_locked(bh)) {
857 if (!buffer_uptodate(bh)) {
861 * ugly interaction with invalidatepage here.
862 * reiserfs_invalidate_page will pin any buffer that has a
863 * valid journal head from an older transaction. If someone
864 * else sets our buffer dirty after we write it in the first
865 * loop, and then someone truncates the page away, nobody
866 * will ever write the buffer. We're safe if we write the
867 * page one last time after freeing the journal header.
869 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
871 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
875 cond_resched_lock(lock);
881 static int flush_older_commits(struct super_block *s,
882 struct reiserfs_journal_list *jl)
884 struct reiserfs_journal *journal = SB_JOURNAL(s);
885 struct reiserfs_journal_list *other_jl;
886 struct reiserfs_journal_list *first_jl;
887 struct list_head *entry;
888 unsigned int trans_id = jl->j_trans_id;
889 unsigned int other_trans_id;
893 * first we walk backwards to find the oldest uncommitted transation
896 entry = jl->j_list.prev;
898 other_jl = JOURNAL_LIST_ENTRY(entry);
899 if (entry == &journal->j_journal_list ||
900 atomic_read(&other_jl->j_older_commits_done))
904 entry = other_jl->j_list.prev;
907 /* if we didn't find any older uncommitted transactions, return now */
908 if (first_jl == jl) {
912 entry = &first_jl->j_list;
914 other_jl = JOURNAL_LIST_ENTRY(entry);
915 other_trans_id = other_jl->j_trans_id;
917 if (other_trans_id < trans_id) {
918 if (atomic_read(&other_jl->j_commit_left) != 0) {
919 flush_commit_list(s, other_jl, 0);
921 /* list we were called with is gone, return */
922 if (!journal_list_still_alive(s, trans_id))
926 * the one we just flushed is gone, this means
927 * all older lists are also gone, so first_jl
928 * is no longer valid either. Go back to the
931 if (!journal_list_still_alive
932 (s, other_trans_id)) {
937 if (entry == &journal->j_journal_list)
946 static int reiserfs_async_progress_wait(struct super_block *s)
948 struct reiserfs_journal *j = SB_JOURNAL(s);
950 if (atomic_read(&j->j_async_throttle)) {
953 depth = reiserfs_write_unlock_nested(s);
954 congestion_wait(BLK_RW_ASYNC, HZ / 10);
955 reiserfs_write_lock_nested(s, depth);
962 * if this journal list still has commit blocks unflushed, send them to disk.
964 * log areas must be flushed in order (transaction 2 can't commit before
965 * transaction 1) Before the commit block can by written, every other log
966 * block must be safely on disk
968 static int flush_commit_list(struct super_block *s,
969 struct reiserfs_journal_list *jl, int flushall)
973 struct buffer_head *tbh = NULL;
974 unsigned int trans_id = jl->j_trans_id;
975 struct reiserfs_journal *journal = SB_JOURNAL(s);
980 reiserfs_check_lock_depth(s, "flush_commit_list");
982 if (atomic_read(&jl->j_older_commits_done)) {
987 * before we can put our commit blocks on disk, we have to make
988 * sure everyone older than us is on disk too
990 BUG_ON(jl->j_len <= 0);
991 BUG_ON(trans_id == journal->j_trans_id);
993 get_journal_list(jl);
995 if (flush_older_commits(s, jl) == 1) {
997 * list disappeared during flush_older_commits.
1004 /* make sure nobody is trying to flush this one at the same time */
1005 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1007 if (!journal_list_still_alive(s, trans_id)) {
1008 mutex_unlock(&jl->j_commit_mutex);
1011 BUG_ON(jl->j_trans_id == 0);
1013 /* this commit is done, exit */
1014 if (atomic_read(&jl->j_commit_left) <= 0) {
1016 atomic_set(&jl->j_older_commits_done, 1);
1018 mutex_unlock(&jl->j_commit_mutex);
1022 if (!list_empty(&jl->j_bh_list)) {
1026 * We might sleep in numerous places inside
1027 * write_ordered_buffers. Relax the write lock.
1029 depth = reiserfs_write_unlock_nested(s);
1030 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1031 journal, jl, &jl->j_bh_list);
1032 if (ret < 0 && retval == 0)
1034 reiserfs_write_lock_nested(s, depth);
1036 BUG_ON(!list_empty(&jl->j_bh_list));
1038 * for the description block and all the log blocks, submit any buffers
1039 * that haven't already reached the disk. Try to write at least 256
1040 * log blocks. later on, we will only wait on blocks that correspond
1041 * to this transaction, but while we're unplugging we might as well
1042 * get a chunk of data on there.
1044 atomic_inc(&journal->j_async_throttle);
1045 write_len = jl->j_len + 1;
1046 if (write_len < 256)
1048 for (i = 0 ; i < write_len ; i++) {
1049 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1050 SB_ONDISK_JOURNAL_SIZE(s);
1051 tbh = journal_find_get_block(s, bn);
1053 if (buffer_dirty(tbh)) {
1054 depth = reiserfs_write_unlock_nested(s);
1055 ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1056 reiserfs_write_lock_nested(s, depth);
1061 atomic_dec(&journal->j_async_throttle);
1063 for (i = 0; i < (jl->j_len + 1); i++) {
1064 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1065 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1066 tbh = journal_find_get_block(s, bn);
1068 depth = reiserfs_write_unlock_nested(s);
1069 __wait_on_buffer(tbh);
1070 reiserfs_write_lock_nested(s, depth);
1072 * since we're using ll_rw_blk above, it might have skipped
1073 * over a locked buffer. Double check here
1075 /* redundant, sync_dirty_buffer() checks */
1076 if (buffer_dirty(tbh)) {
1077 depth = reiserfs_write_unlock_nested(s);
1078 sync_dirty_buffer(tbh);
1079 reiserfs_write_lock_nested(s, depth);
1081 if (unlikely(!buffer_uptodate(tbh))) {
1082 #ifdef CONFIG_REISERFS_CHECK
1083 reiserfs_warning(s, "journal-601",
1084 "buffer write failed");
1088 /* once for journal_find_get_block */
1090 /* once due to original getblk in do_journal_end */
1092 atomic_dec(&jl->j_commit_left);
1095 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1098 * If there was a write error in the journal - we can't commit
1099 * this transaction - it will be invalid and, if successful,
1100 * will just end up propagating the write error out to
1103 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1104 if (buffer_dirty(jl->j_commit_bh))
1106 mark_buffer_dirty(jl->j_commit_bh) ;
1107 depth = reiserfs_write_unlock_nested(s);
1108 if (reiserfs_barrier_flush(s))
1109 __sync_dirty_buffer(jl->j_commit_bh,
1110 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1112 sync_dirty_buffer(jl->j_commit_bh);
1113 reiserfs_write_lock_nested(s, depth);
1117 * If there was a write error in the journal - we can't commit this
1118 * transaction - it will be invalid and, if successful, will just end
1119 * up propagating the write error out to the filesystem.
1121 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1122 #ifdef CONFIG_REISERFS_CHECK
1123 reiserfs_warning(s, "journal-615", "buffer write failed");
1127 bforget(jl->j_commit_bh);
1128 if (journal->j_last_commit_id != 0 &&
1129 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1130 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1131 journal->j_last_commit_id, jl->j_trans_id);
1133 journal->j_last_commit_id = jl->j_trans_id;
1136 * now, every commit block is on the disk. It is safe to allow
1137 * blocks freed during this transaction to be reallocated
1139 cleanup_freed_for_journal_list(s, jl);
1141 retval = retval ? retval : journal->j_errno;
1143 /* mark the metadata dirty */
1145 dirty_one_transaction(s, jl);
1146 atomic_dec(&jl->j_commit_left);
1149 atomic_set(&jl->j_older_commits_done, 1);
1151 mutex_unlock(&jl->j_commit_mutex);
1153 put_journal_list(s, jl);
1156 reiserfs_abort(s, retval, "Journal write error in %s",
1162 * flush_journal_list frequently needs to find a newer transaction for a
1163 * given block. This does that, or returns NULL if it can't find anything
1165 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1166 reiserfs_journal_cnode
1169 struct super_block *sb = cn->sb;
1170 b_blocknr_t blocknr = cn->blocknr;
1174 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1182 static void remove_journal_hash(struct super_block *,
1183 struct reiserfs_journal_cnode **,
1184 struct reiserfs_journal_list *, unsigned long,
1188 * once all the real blocks have been flushed, it is safe to remove them
1189 * from the journal list for this transaction. Aside from freeing the
1190 * cnode, this also allows the block to be reallocated for data blocks
1191 * if it had been deleted.
1193 static void remove_all_from_journal_list(struct super_block *sb,
1194 struct reiserfs_journal_list *jl,
1197 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1198 struct reiserfs_journal_cnode *cn, *last;
1199 cn = jl->j_realblock;
1202 * which is better, to lock once around the whole loop, or
1203 * to lock for each call to remove_journal_hash?
1206 if (cn->blocknr != 0) {
1208 reiserfs_warning(sb, "reiserfs-2201",
1209 "block %u, bh is %d, state %ld",
1210 cn->blocknr, cn->bh ? 1 : 0,
1214 remove_journal_hash(sb, journal->j_list_hash_table,
1215 jl, cn->blocknr, 1);
1219 free_cnode(sb, last);
1221 jl->j_realblock = NULL;
1225 * if this timestamp is greater than the timestamp we wrote last to the
1226 * header block, write it to the header block. once this is done, I can
1227 * safely say the log area for this transaction won't ever be replayed,
1228 * and I can start releasing blocks in this transaction for reuse as data
1229 * blocks. called by flush_journal_list, before it calls
1230 * remove_all_from_journal_list
1232 static int _update_journal_header_block(struct super_block *sb,
1233 unsigned long offset,
1234 unsigned int trans_id)
1236 struct reiserfs_journal_header *jh;
1237 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1240 if (reiserfs_is_journal_aborted(journal))
1243 if (trans_id >= journal->j_last_flush_trans_id) {
1244 if (buffer_locked((journal->j_header_bh))) {
1245 depth = reiserfs_write_unlock_nested(sb);
1246 __wait_on_buffer(journal->j_header_bh);
1247 reiserfs_write_lock_nested(sb, depth);
1248 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1249 #ifdef CONFIG_REISERFS_CHECK
1250 reiserfs_warning(sb, "journal-699",
1251 "buffer write failed");
1256 journal->j_last_flush_trans_id = trans_id;
1257 journal->j_first_unflushed_offset = offset;
1258 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1260 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1261 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1262 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1264 set_buffer_dirty(journal->j_header_bh);
1265 depth = reiserfs_write_unlock_nested(sb);
1267 if (reiserfs_barrier_flush(sb))
1268 __sync_dirty_buffer(journal->j_header_bh,
1269 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1271 sync_dirty_buffer(journal->j_header_bh);
1273 reiserfs_write_lock_nested(sb, depth);
1274 if (!buffer_uptodate(journal->j_header_bh)) {
1275 reiserfs_warning(sb, "journal-837",
1276 "IO error during journal replay");
1283 static int update_journal_header_block(struct super_block *sb,
1284 unsigned long offset,
1285 unsigned int trans_id)
1287 return _update_journal_header_block(sb, offset, trans_id);
1291 ** flush any and all journal lists older than you are
1292 ** can only be called from flush_journal_list
1294 static int flush_older_journal_lists(struct super_block *sb,
1295 struct reiserfs_journal_list *jl)
1297 struct list_head *entry;
1298 struct reiserfs_journal_list *other_jl;
1299 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1300 unsigned int trans_id = jl->j_trans_id;
1303 * we know we are the only ones flushing things, no extra race
1304 * protection is required.
1307 entry = journal->j_journal_list.next;
1309 if (entry == &journal->j_journal_list)
1311 other_jl = JOURNAL_LIST_ENTRY(entry);
1312 if (other_jl->j_trans_id < trans_id) {
1313 BUG_ON(other_jl->j_refcount <= 0);
1314 /* do not flush all */
1315 flush_journal_list(sb, other_jl, 0);
1317 /* other_jl is now deleted from the list */
1323 static void del_from_work_list(struct super_block *s,
1324 struct reiserfs_journal_list *jl)
1326 struct reiserfs_journal *journal = SB_JOURNAL(s);
1327 if (!list_empty(&jl->j_working_list)) {
1328 list_del_init(&jl->j_working_list);
1329 journal->j_num_work_lists--;
1334 * flush a journal list, both commit and real blocks
1336 * always set flushall to 1, unless you are calling from inside
1337 * flush_journal_list
1339 * IMPORTANT. This can only be called while there are no journal writers,
1340 * and the journal is locked. That means it can only be called from
1341 * do_journal_end, or by journal_release
1343 static int flush_journal_list(struct super_block *s,
1344 struct reiserfs_journal_list *jl, int flushall)
1346 struct reiserfs_journal_list *pjl;
1347 struct reiserfs_journal_cnode *cn;
1351 struct buffer_head *saved_bh;
1352 unsigned long j_len_saved = jl->j_len;
1353 struct reiserfs_journal *journal = SB_JOURNAL(s);
1357 BUG_ON(j_len_saved <= 0);
1359 if (atomic_read(&journal->j_wcount) != 0) {
1360 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1361 atomic_read(&journal->j_wcount));
1364 /* if flushall == 0, the lock is already held */
1366 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1367 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1372 if (j_len_saved > journal->j_trans_max) {
1373 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1374 j_len_saved, jl->j_trans_id);
1378 /* if all the work is already done, get out of here */
1379 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1380 atomic_read(&jl->j_commit_left) <= 0) {
1381 goto flush_older_and_return;
1385 * start by putting the commit list on disk. This will also flush
1386 * the commit lists of any olders transactions
1388 flush_commit_list(s, jl, 1);
1390 if (!(jl->j_state & LIST_DIRTY)
1391 && !reiserfs_is_journal_aborted(journal))
1394 /* are we done now? */
1395 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1396 atomic_read(&jl->j_commit_left) <= 0) {
1397 goto flush_older_and_return;
1401 * loop through each cnode, see if we need to write it,
1402 * or wait on a more recent transaction, or just ignore it
1404 if (atomic_read(&journal->j_wcount) != 0) {
1405 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1408 cn = jl->j_realblock;
1413 /* blocknr of 0 is no longer in the hash, ignore it */
1414 if (cn->blocknr == 0) {
1419 * This transaction failed commit.
1420 * Don't write out to the disk
1422 if (!(jl->j_state & LIST_DIRTY))
1425 pjl = find_newer_jl_for_cn(cn);
1427 * the order is important here. We check pjl to make sure we
1428 * don't clear BH_JDirty_wait if we aren't the one writing this
1431 if (!pjl && cn->bh) {
1435 * we do this to make sure nobody releases the
1436 * buffer while we are working with it
1440 if (buffer_journal_dirty(saved_bh)) {
1441 BUG_ON(!can_dirty(cn));
1444 } else if (can_dirty(cn)) {
1446 * everything with !pjl && jwait
1447 * should be writable
1454 * if someone has this block in a newer transaction, just make
1455 * sure they are committed, and don't try writing it to disk
1458 if (atomic_read(&pjl->j_commit_left))
1459 flush_commit_list(s, pjl, 1);
1464 * bh == NULL when the block got to disk on its own, OR,
1465 * the block got freed in a future transaction
1467 if (saved_bh == NULL) {
1472 * this should never happen. kupdate_one_transaction has
1473 * this list locked while it works, so we should never see a
1474 * buffer here that is not marked JDirty_wait
1476 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1477 reiserfs_warning(s, "journal-813",
1478 "BAD! buffer %llu %cdirty %cjwait, "
1479 "not in a newer transaction",
1480 (unsigned long long)saved_bh->
1481 b_blocknr, was_dirty ? ' ' : '!',
1482 was_jwait ? ' ' : '!');
1486 * we inc again because saved_bh gets decremented
1490 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1491 lock_buffer(saved_bh);
1492 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1493 if (buffer_dirty(saved_bh))
1494 submit_logged_buffer(saved_bh);
1496 unlock_buffer(saved_bh);
1499 reiserfs_warning(s, "clm-2082",
1500 "Unable to flush buffer %llu in %s",
1501 (unsigned long long)saved_bh->
1502 b_blocknr, __func__);
1508 * we incremented this to keep others from
1509 * taking the buffer head away
1512 if (atomic_read(&saved_bh->b_count) < 0) {
1513 reiserfs_warning(s, "journal-945",
1514 "saved_bh->b_count < 0");
1519 cn = jl->j_realblock;
1521 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1523 reiserfs_panic(s, "journal-1011",
1527 depth = reiserfs_write_unlock_nested(s);
1528 __wait_on_buffer(cn->bh);
1529 reiserfs_write_lock_nested(s, depth);
1532 reiserfs_panic(s, "journal-1012",
1535 if (unlikely(!buffer_uptodate(cn->bh))) {
1536 #ifdef CONFIG_REISERFS_CHECK
1537 reiserfs_warning(s, "journal-949",
1538 "buffer write failed");
1543 * note, we must clear the JDirty_wait bit
1544 * after the up to date check, otherwise we
1545 * race against our flushpage routine
1547 BUG_ON(!test_clear_buffer_journal_dirty
1550 /* drop one ref for us */
1552 /* drop one ref for journal_mark_dirty */
1553 release_buffer_page(cn->bh);
1560 reiserfs_abort(s, -EIO,
1561 "Write error while pushing transaction to disk in %s",
1563 flush_older_and_return:
1566 * before we can update the journal header block, we _must_ flush all
1567 * real blocks from all older transactions to disk. This is because
1568 * once the header block is updated, this transaction will not be
1569 * replayed after a crash
1572 flush_older_journal_lists(s, jl);
1575 err = journal->j_errno;
1577 * before we can remove everything from the hash tables for this
1578 * transaction, we must make sure it can never be replayed
1580 * since we are only called from do_journal_end, we know for sure there
1581 * are no allocations going on while we are flushing journal lists. So,
1582 * we only need to update the journal header block for the last list
1585 if (!err && flushall) {
1587 update_journal_header_block(s,
1588 (jl->j_start + jl->j_len +
1589 2) % SB_ONDISK_JOURNAL_SIZE(s),
1592 reiserfs_abort(s, -EIO,
1593 "Write error while updating journal header in %s",
1596 remove_all_from_journal_list(s, jl, 0);
1597 list_del_init(&jl->j_list);
1598 journal->j_num_lists--;
1599 del_from_work_list(s, jl);
1601 if (journal->j_last_flush_id != 0 &&
1602 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1603 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1604 journal->j_last_flush_id, jl->j_trans_id);
1606 journal->j_last_flush_id = jl->j_trans_id;
1609 * not strictly required since we are freeing the list, but it should
1610 * help find code using dead lists later on
1613 atomic_set(&jl->j_nonzerolen, 0);
1615 jl->j_realblock = NULL;
1616 jl->j_commit_bh = NULL;
1619 put_journal_list(s, jl);
1621 mutex_unlock(&journal->j_flush_mutex);
1625 static int write_one_transaction(struct super_block *s,
1626 struct reiserfs_journal_list *jl,
1627 struct buffer_chunk *chunk)
1629 struct reiserfs_journal_cnode *cn;
1632 jl->j_state |= LIST_TOUCHED;
1633 del_from_work_list(s, jl);
1634 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1638 cn = jl->j_realblock;
1641 * if the blocknr == 0, this has been cleared from the hash,
1644 if (cn->blocknr == 0) {
1647 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1648 struct buffer_head *tmp_bh;
1650 * we can race against journal_mark_freed when we try
1651 * to lock_buffer(cn->bh), so we have to inc the buffer
1652 * count, and recheck things after locking
1656 lock_buffer(tmp_bh);
1657 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1658 if (!buffer_journal_dirty(tmp_bh) ||
1659 buffer_journal_prepared(tmp_bh))
1661 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1664 /* note, cn->bh might be null now */
1665 unlock_buffer(tmp_bh);
1676 /* used by flush_commit_list */
1677 static void dirty_one_transaction(struct super_block *s,
1678 struct reiserfs_journal_list *jl)
1680 struct reiserfs_journal_cnode *cn;
1681 struct reiserfs_journal_list *pjl;
1683 jl->j_state |= LIST_DIRTY;
1684 cn = jl->j_realblock;
1687 * look for a more recent transaction that logged this
1688 * buffer. Only the most recent transaction with a buffer in
1689 * it is allowed to send that buffer to disk
1691 pjl = find_newer_jl_for_cn(cn);
1692 if (!pjl && cn->blocknr && cn->bh
1693 && buffer_journal_dirty(cn->bh)) {
1694 BUG_ON(!can_dirty(cn));
1696 * if the buffer is prepared, it will either be logged
1697 * or restored. If restored, we need to make sure
1698 * it actually gets marked dirty
1700 clear_buffer_journal_new(cn->bh);
1701 if (buffer_journal_prepared(cn->bh)) {
1702 set_buffer_journal_restore_dirty(cn->bh);
1704 set_buffer_journal_test(cn->bh);
1705 mark_buffer_dirty(cn->bh);
1712 static int kupdate_transactions(struct super_block *s,
1713 struct reiserfs_journal_list *jl,
1714 struct reiserfs_journal_list **next_jl,
1715 unsigned int *next_trans_id,
1716 int num_blocks, int num_trans)
1720 int transactions_flushed = 0;
1721 unsigned int orig_trans_id = jl->j_trans_id;
1722 struct buffer_chunk chunk;
1723 struct list_head *entry;
1724 struct reiserfs_journal *journal = SB_JOURNAL(s);
1727 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1728 if (!journal_list_still_alive(s, orig_trans_id)) {
1733 * we've got j_flush_mutex held, nobody is going to delete any
1734 * of these lists out from underneath us
1736 while ((num_trans && transactions_flushed < num_trans) ||
1737 (!num_trans && written < num_blocks)) {
1739 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1740 atomic_read(&jl->j_commit_left)
1741 || !(jl->j_state & LIST_DIRTY)) {
1742 del_from_work_list(s, jl);
1745 ret = write_one_transaction(s, jl, &chunk);
1749 transactions_flushed++;
1751 entry = jl->j_list.next;
1754 if (entry == &journal->j_journal_list) {
1757 jl = JOURNAL_LIST_ENTRY(entry);
1759 /* don't bother with older transactions */
1760 if (jl->j_trans_id <= orig_trans_id)
1764 write_chunk(&chunk);
1768 mutex_unlock(&journal->j_flush_mutex);
1773 * for o_sync and fsync heavy applications, they tend to use
1774 * all the journa list slots with tiny transactions. These
1775 * trigger lots and lots of calls to update the header block, which
1776 * adds seeks and slows things down.
1778 * This function tries to clear out a large chunk of the journal lists
1779 * at once, which makes everything faster since only the newest journal
1780 * list updates the header block
1782 static int flush_used_journal_lists(struct super_block *s,
1783 struct reiserfs_journal_list *jl)
1785 unsigned long len = 0;
1786 unsigned long cur_len;
1789 struct reiserfs_journal_list *tjl;
1790 struct reiserfs_journal_list *flush_jl;
1791 unsigned int trans_id;
1792 struct reiserfs_journal *journal = SB_JOURNAL(s);
1794 flush_jl = tjl = jl;
1796 /* in data logging mode, try harder to flush a lot of blocks */
1797 if (reiserfs_data_log(s))
1799 /* flush for 256 transactions or limit blocks, whichever comes first */
1800 for (i = 0; i < 256 && len < limit; i++) {
1801 if (atomic_read(&tjl->j_commit_left) ||
1802 tjl->j_trans_id < jl->j_trans_id) {
1805 cur_len = atomic_read(&tjl->j_nonzerolen);
1807 tjl->j_state &= ~LIST_TOUCHED;
1811 if (tjl->j_list.next == &journal->j_journal_list)
1813 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1815 get_journal_list(jl);
1816 get_journal_list(flush_jl);
1819 * try to find a group of blocks we can flush across all the
1820 * transactions, but only bother if we've actually spanned
1821 * across multiple lists
1824 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1826 flush_journal_list(s, flush_jl, 1);
1827 put_journal_list(s, flush_jl);
1828 put_journal_list(s, jl);
1833 * removes any nodes in table with name block and dev as bh.
1834 * only touchs the hnext and hprev pointers.
1836 static void remove_journal_hash(struct super_block *sb,
1837 struct reiserfs_journal_cnode **table,
1838 struct reiserfs_journal_list *jl,
1839 unsigned long block, int remove_freed)
1841 struct reiserfs_journal_cnode *cur;
1842 struct reiserfs_journal_cnode **head;
1844 head = &(journal_hash(table, sb, block));
1850 if (cur->blocknr == block && cur->sb == sb
1851 && (jl == NULL || jl == cur->jlist)
1852 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1854 cur->hnext->hprev = cur->hprev;
1857 cur->hprev->hnext = cur->hnext;
1865 * anybody who clears the cur->bh will also
1866 * dec the nonzerolen
1868 if (cur->bh && cur->jlist)
1869 atomic_dec(&cur->jlist->j_nonzerolen);
1877 static void free_journal_ram(struct super_block *sb)
1879 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1880 kfree(journal->j_current_jl);
1881 journal->j_num_lists--;
1883 vfree(journal->j_cnode_free_orig);
1884 free_list_bitmaps(sb, journal->j_list_bitmap);
1885 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1886 if (journal->j_header_bh) {
1887 brelse(journal->j_header_bh);
1890 * j_header_bh is on the journal dev, make sure
1891 * not to release the journal dev until we brelse j_header_bh
1893 release_journal_dev(sb, journal);
1898 * call on unmount. Only set error to 1 if you haven't made your way out
1899 * of read_super() yet. Any other caller must keep error at 0.
1901 static int do_journal_release(struct reiserfs_transaction_handle *th,
1902 struct super_block *sb, int error)
1904 struct reiserfs_transaction_handle myth;
1905 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1908 * we only want to flush out transactions if we were
1909 * called with error == 0
1911 if (!error && !sb_rdonly(sb)) {
1912 /* end the current trans */
1913 BUG_ON(!th->t_trans_id);
1914 do_journal_end(th, FLUSH_ALL);
1917 * make sure something gets logged to force
1918 * our way into the flush code
1920 if (!journal_join(&myth, sb)) {
1921 reiserfs_prepare_for_journal(sb,
1922 SB_BUFFER_WITH_SB(sb),
1924 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1925 do_journal_end(&myth, FLUSH_ALL);
1929 /* this also catches errors during the do_journal_end above */
1930 if (!error && reiserfs_is_journal_aborted(journal)) {
1931 memset(&myth, 0, sizeof(myth));
1932 if (!journal_join_abort(&myth, sb)) {
1933 reiserfs_prepare_for_journal(sb,
1934 SB_BUFFER_WITH_SB(sb),
1936 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1937 do_journal_end(&myth, FLUSH_ALL);
1943 * We must release the write lock here because
1944 * the workqueue job (flush_async_commit) needs this lock
1946 reiserfs_write_unlock(sb);
1949 * Cancel flushing of old commits. Note that neither of these works
1950 * will be requeued because superblock is being shutdown and doesn't
1951 * have SB_ACTIVE set.
1953 reiserfs_cancel_old_flush(sb);
1954 /* wait for all commits to finish */
1955 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1957 free_journal_ram(sb);
1959 reiserfs_write_lock(sb);
1964 /* * call on unmount. flush all journal trans, release all alloc'd ram */
1965 int journal_release(struct reiserfs_transaction_handle *th,
1966 struct super_block *sb)
1968 return do_journal_release(th, sb, 0);
1971 /* only call from an error condition inside reiserfs_read_super! */
1972 int journal_release_error(struct reiserfs_transaction_handle *th,
1973 struct super_block *sb)
1975 return do_journal_release(th, sb, 1);
1979 * compares description block with commit block.
1980 * returns 1 if they differ, 0 if they are the same
1982 static int journal_compare_desc_commit(struct super_block *sb,
1983 struct reiserfs_journal_desc *desc,
1984 struct reiserfs_journal_commit *commit)
1986 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1987 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1988 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1989 get_commit_trans_len(commit) <= 0) {
1996 * returns 0 if it did not find a description block
1997 * returns -1 if it found a corrupt commit block
1998 * returns 1 if both desc and commit were valid
1999 * NOTE: only called during fs mount
2001 static int journal_transaction_is_valid(struct super_block *sb,
2002 struct buffer_head *d_bh,
2003 unsigned int *oldest_invalid_trans_id,
2004 unsigned long *newest_mount_id)
2006 struct reiserfs_journal_desc *desc;
2007 struct reiserfs_journal_commit *commit;
2008 struct buffer_head *c_bh;
2009 unsigned long offset;
2014 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2015 if (get_desc_trans_len(desc) > 0
2016 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2017 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2018 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2019 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2020 "journal-986: transaction "
2021 "is valid returning because trans_id %d is greater than "
2022 "oldest_invalid %lu",
2023 get_desc_trans_id(desc),
2024 *oldest_invalid_trans_id);
2028 && *newest_mount_id > get_desc_mount_id(desc)) {
2029 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2030 "journal-1087: transaction "
2031 "is valid returning because mount_id %d is less than "
2032 "newest_mount_id %lu",
2033 get_desc_mount_id(desc),
2037 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2038 reiserfs_warning(sb, "journal-2018",
2039 "Bad transaction length %d "
2040 "encountered, ignoring transaction",
2041 get_desc_trans_len(desc));
2044 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2047 * ok, we have a journal description block,
2048 * let's see if the transaction was valid
2052 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2053 ((offset + get_desc_trans_len(desc) +
2054 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2057 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2058 if (journal_compare_desc_commit(sb, desc, commit)) {
2059 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2060 "journal_transaction_is_valid, commit offset %ld had bad "
2061 "time %d or length %d",
2063 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2064 get_commit_trans_id(commit),
2065 get_commit_trans_len(commit));
2067 if (oldest_invalid_trans_id) {
2068 *oldest_invalid_trans_id =
2069 get_desc_trans_id(desc);
2070 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2072 "transaction_is_valid setting oldest invalid trans_id "
2074 get_desc_trans_id(desc));
2079 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2080 "journal-1006: found valid "
2081 "transaction start offset %llu, len %d id %d",
2083 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2084 get_desc_trans_len(desc),
2085 get_desc_trans_id(desc));
2092 static void brelse_array(struct buffer_head **heads, int num)
2095 for (i = 0; i < num; i++) {
2101 * given the start, and values for the oldest acceptable transactions,
2102 * this either reads in a replays a transaction, or returns because the
2103 * transaction is invalid, or too old.
2104 * NOTE: only called during fs mount
2106 static int journal_read_transaction(struct super_block *sb,
2107 unsigned long cur_dblock,
2108 unsigned long oldest_start,
2109 unsigned int oldest_trans_id,
2110 unsigned long newest_mount_id)
2112 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2113 struct reiserfs_journal_desc *desc;
2114 struct reiserfs_journal_commit *commit;
2115 unsigned int trans_id = 0;
2116 struct buffer_head *c_bh;
2117 struct buffer_head *d_bh;
2118 struct buffer_head **log_blocks = NULL;
2119 struct buffer_head **real_blocks = NULL;
2120 unsigned int trans_offset;
2124 d_bh = journal_bread(sb, cur_dblock);
2127 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2128 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2129 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2130 "journal_read_transaction, offset %llu, len %d mount_id %d",
2131 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2132 get_desc_trans_len(desc), get_desc_mount_id(desc));
2133 if (get_desc_trans_id(desc) < oldest_trans_id) {
2134 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2135 "journal_read_trans skipping because %lu is too old",
2137 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2141 if (get_desc_mount_id(desc) != newest_mount_id) {
2142 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2143 "journal_read_trans skipping because %d is != "
2144 "newest_mount_id %lu", get_desc_mount_id(desc),
2149 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2150 ((trans_offset + get_desc_trans_len(desc) + 1) %
2151 SB_ONDISK_JOURNAL_SIZE(sb)));
2156 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2157 if (journal_compare_desc_commit(sb, desc, commit)) {
2158 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2159 "journal_read_transaction, "
2160 "commit offset %llu had bad time %d or length %d",
2162 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2163 get_commit_trans_id(commit),
2164 get_commit_trans_len(commit));
2170 if (bdev_read_only(sb->s_bdev)) {
2171 reiserfs_warning(sb, "clm-2076",
2172 "device is readonly, unable to replay log");
2178 trans_id = get_desc_trans_id(desc);
2180 * now we know we've got a good transaction, and it was
2181 * inside the valid time ranges
2183 log_blocks = kmalloc_array(get_desc_trans_len(desc),
2184 sizeof(struct buffer_head *),
2186 real_blocks = kmalloc_array(get_desc_trans_len(desc),
2187 sizeof(struct buffer_head *),
2189 if (!log_blocks || !real_blocks) {
2194 reiserfs_warning(sb, "journal-1169",
2195 "kmalloc failed, unable to mount FS");
2198 /* get all the buffer heads */
2199 trans_half = journal_trans_half(sb->s_blocksize);
2200 for (i = 0; i < get_desc_trans_len(desc); i++) {
2203 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2205 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2206 if (i < trans_half) {
2209 le32_to_cpu(desc->j_realblock[i]));
2213 le32_to_cpu(commit->
2214 j_realblock[i - trans_half]));
2216 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2217 reiserfs_warning(sb, "journal-1207",
2218 "REPLAY FAILURE fsck required! "
2219 "Block to replay is outside of "
2223 /* make sure we don't try to replay onto log or reserved area */
2224 if (is_block_in_log_or_reserved_area
2225 (sb, real_blocks[i]->b_blocknr)) {
2226 reiserfs_warning(sb, "journal-1204",
2227 "REPLAY FAILURE fsck required! "
2228 "Trying to replay onto a log block");
2230 brelse_array(log_blocks, i);
2231 brelse_array(real_blocks, i);
2239 /* read in the log blocks, memcpy to the corresponding real block */
2240 ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2241 for (i = 0; i < get_desc_trans_len(desc); i++) {
2243 wait_on_buffer(log_blocks[i]);
2244 if (!buffer_uptodate(log_blocks[i])) {
2245 reiserfs_warning(sb, "journal-1212",
2246 "REPLAY FAILURE fsck required! "
2247 "buffer write failed");
2248 brelse_array(log_blocks + i,
2249 get_desc_trans_len(desc) - i);
2250 brelse_array(real_blocks, get_desc_trans_len(desc));
2257 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2258 real_blocks[i]->b_size);
2259 set_buffer_uptodate(real_blocks[i]);
2260 brelse(log_blocks[i]);
2262 /* flush out the real blocks */
2263 for (i = 0; i < get_desc_trans_len(desc); i++) {
2264 set_buffer_dirty(real_blocks[i]);
2265 write_dirty_buffer(real_blocks[i], 0);
2267 for (i = 0; i < get_desc_trans_len(desc); i++) {
2268 wait_on_buffer(real_blocks[i]);
2269 if (!buffer_uptodate(real_blocks[i])) {
2270 reiserfs_warning(sb, "journal-1226",
2271 "REPLAY FAILURE, fsck required! "
2272 "buffer write failed");
2273 brelse_array(real_blocks + i,
2274 get_desc_trans_len(desc) - i);
2281 brelse(real_blocks[i]);
2284 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2285 ((trans_offset + get_desc_trans_len(desc) +
2286 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2287 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2288 "journal-1095: setting journal " "start to offset %ld",
2289 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2292 * init starting values for the first transaction, in case
2293 * this is the last transaction to be replayed.
2295 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2296 journal->j_last_flush_trans_id = trans_id;
2297 journal->j_trans_id = trans_id + 1;
2298 /* check for trans_id overflow */
2299 if (journal->j_trans_id == 0)
2300 journal->j_trans_id = 10;
2309 * This function reads blocks starting from block and to max_block of bufsize
2310 * size (but no more than BUFNR blocks at a time). This proved to improve
2311 * mounting speed on self-rebuilding raid5 arrays at least.
2312 * Right now it is only used from journal code. But later we might use it
2313 * from other places.
2314 * Note: Do not use journal_getblk/sb_getblk functions here!
2316 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2317 b_blocknr_t block, int bufsize,
2318 b_blocknr_t max_block)
2320 struct buffer_head *bhlist[BUFNR];
2321 unsigned int blocks = BUFNR;
2322 struct buffer_head *bh;
2325 bh = __getblk(dev, block, bufsize);
2326 if (buffer_uptodate(bh))
2329 if (block + BUFNR > max_block) {
2330 blocks = max_block - block;
2334 for (i = 1; i < blocks; i++) {
2335 bh = __getblk(dev, block + i, bufsize);
2336 if (buffer_uptodate(bh)) {
2342 ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2343 for (i = 1; i < j; i++)
2347 if (buffer_uptodate(bh))
2354 * read and replay the log
2355 * on a clean unmount, the journal header's next unflushed pointer will be
2356 * to an invalid transaction. This tests that before finding all the
2357 * transactions in the log, which makes normal mount times fast.
2359 * After a crash, this starts with the next unflushed transaction, and
2360 * replays until it finds one too old, or invalid.
2362 * On exit, it sets things up so the first transaction will work correctly.
2363 * NOTE: only called during fs mount
2365 static int journal_read(struct super_block *sb)
2367 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2368 struct reiserfs_journal_desc *desc;
2369 unsigned int oldest_trans_id = 0;
2370 unsigned int oldest_invalid_trans_id = 0;
2372 unsigned long oldest_start = 0;
2373 unsigned long cur_dblock = 0;
2374 unsigned long newest_mount_id = 9;
2375 struct buffer_head *d_bh;
2376 struct reiserfs_journal_header *jh;
2377 int valid_journal_header = 0;
2378 int replay_count = 0;
2379 int continue_replay = 1;
2382 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2383 reiserfs_info(sb, "checking transaction log (%pg)\n",
2385 start = ktime_get_seconds();
2388 * step 1, read in the journal header block. Check the transaction
2389 * it says is the first unflushed, and if that transaction is not
2390 * valid, replay is done
2392 journal->j_header_bh = journal_bread(sb,
2393 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2394 + SB_ONDISK_JOURNAL_SIZE(sb));
2395 if (!journal->j_header_bh) {
2398 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2399 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2400 SB_ONDISK_JOURNAL_SIZE(sb)
2401 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2403 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2404 le32_to_cpu(jh->j_first_unflushed_offset);
2405 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2406 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2407 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2408 "journal-1153: found in "
2409 "header: first_unflushed_offset %d, last_flushed_trans_id "
2410 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2411 le32_to_cpu(jh->j_last_flush_trans_id));
2412 valid_journal_header = 1;
2415 * now, we try to read the first unflushed offset. If it
2416 * is not valid, there is nothing more we can do, and it
2417 * makes no sense to read through the whole log.
2421 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2422 le32_to_cpu(jh->j_first_unflushed_offset));
2423 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2425 continue_replay = 0;
2428 goto start_log_replay;
2432 * ok, there are transactions that need to be replayed. start
2433 * with the first log block, find all the valid transactions, and
2434 * pick out the oldest.
2436 while (continue_replay
2438 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2439 SB_ONDISK_JOURNAL_SIZE(sb))) {
2441 * Note that it is required for blocksize of primary fs
2442 * device and journal device to be the same
2445 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2447 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2448 SB_ONDISK_JOURNAL_SIZE(sb));
2450 journal_transaction_is_valid(sb, d_bh,
2451 &oldest_invalid_trans_id,
2454 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2455 if (oldest_start == 0) { /* init all oldest_ values */
2456 oldest_trans_id = get_desc_trans_id(desc);
2457 oldest_start = d_bh->b_blocknr;
2458 newest_mount_id = get_desc_mount_id(desc);
2459 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2460 "journal-1179: Setting "
2461 "oldest_start to offset %llu, trans_id %lu",
2463 SB_ONDISK_JOURNAL_1st_BLOCK
2464 (sb), oldest_trans_id);
2465 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2466 /* one we just read was older */
2467 oldest_trans_id = get_desc_trans_id(desc);
2468 oldest_start = d_bh->b_blocknr;
2469 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2470 "journal-1180: Resetting "
2471 "oldest_start to offset %lu, trans_id %lu",
2473 SB_ONDISK_JOURNAL_1st_BLOCK
2474 (sb), oldest_trans_id);
2476 if (newest_mount_id < get_desc_mount_id(desc)) {
2477 newest_mount_id = get_desc_mount_id(desc);
2478 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2479 "journal-1299: Setting "
2480 "newest_mount_id to %d",
2481 get_desc_mount_id(desc));
2483 cur_dblock += get_desc_trans_len(desc) + 2;
2491 cur_dblock = oldest_start;
2492 if (oldest_trans_id) {
2493 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2494 "journal-1206: Starting replay "
2495 "from offset %llu, trans_id %lu",
2496 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501 while (continue_replay && oldest_trans_id > 0) {
2503 journal_read_transaction(sb, cur_dblock, oldest_start,
2504 oldest_trans_id, newest_mount_id);
2507 } else if (ret != 0) {
2511 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2513 if (cur_dblock == oldest_start)
2517 if (oldest_trans_id == 0) {
2518 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2519 "journal-1225: No valid " "transactions found");
2522 * j_start does not get set correctly if we don't replay any
2523 * transactions. if we had a valid journal_header, set j_start
2524 * to the first unflushed transaction value, copy the trans_id
2527 if (valid_journal_header && replay_count == 0) {
2528 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2529 journal->j_trans_id =
2530 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2531 /* check for trans_id overflow */
2532 if (journal->j_trans_id == 0)
2533 journal->j_trans_id = 10;
2534 journal->j_last_flush_trans_id =
2535 le32_to_cpu(jh->j_last_flush_trans_id);
2536 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2538 journal->j_mount_id = newest_mount_id + 1;
2540 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2541 "newest_mount_id to %lu", journal->j_mount_id);
2542 journal->j_first_unflushed_offset = journal->j_start;
2543 if (replay_count > 0) {
2545 "replayed %d transactions in %lu seconds\n",
2546 replay_count, ktime_get_seconds() - start);
2548 /* needed to satisfy the locking in _update_journal_header_block */
2549 reiserfs_write_lock(sb);
2550 if (!bdev_read_only(sb->s_bdev) &&
2551 _update_journal_header_block(sb, journal->j_start,
2552 journal->j_last_flush_trans_id)) {
2553 reiserfs_write_unlock(sb);
2555 * replay failed, caller must call free_journal_ram and abort
2560 reiserfs_write_unlock(sb);
2564 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2566 struct reiserfs_journal_list *jl;
2567 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2568 GFP_NOFS | __GFP_NOFAIL);
2569 INIT_LIST_HEAD(&jl->j_list);
2570 INIT_LIST_HEAD(&jl->j_working_list);
2571 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2572 INIT_LIST_HEAD(&jl->j_bh_list);
2573 mutex_init(&jl->j_commit_mutex);
2574 SB_JOURNAL(s)->j_num_lists++;
2575 get_journal_list(jl);
2579 static void journal_list_init(struct super_block *sb)
2581 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2584 static void release_journal_dev(struct super_block *super,
2585 struct reiserfs_journal *journal)
2587 if (journal->j_dev_bd != NULL) {
2588 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2589 journal->j_dev_bd = NULL;
2593 static int journal_init_dev(struct super_block *super,
2594 struct reiserfs_journal *journal,
2595 const char *jdev_name)
2599 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2603 journal->j_dev_bd = NULL;
2604 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2605 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2607 if (bdev_read_only(super->s_bdev))
2608 blkdev_mode = FMODE_READ;
2610 /* there is no "jdev" option and journal is on separate device */
2611 if ((!jdev_name || !jdev_name[0])) {
2612 if (jdev == super->s_dev)
2613 blkdev_mode &= ~FMODE_EXCL;
2614 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2616 journal->j_dev_mode = blkdev_mode;
2617 if (IS_ERR(journal->j_dev_bd)) {
2618 result = PTR_ERR(journal->j_dev_bd);
2619 journal->j_dev_bd = NULL;
2620 reiserfs_warning(super, "sh-458",
2621 "cannot init journal device unknown-block(%u,%u): %i",
2622 MAJOR(jdev), MINOR(jdev), result);
2624 } else if (jdev != super->s_dev)
2625 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2630 journal->j_dev_mode = blkdev_mode;
2631 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2632 if (IS_ERR(journal->j_dev_bd)) {
2633 result = PTR_ERR(journal->j_dev_bd);
2634 journal->j_dev_bd = NULL;
2635 reiserfs_warning(super, "sh-457",
2636 "journal_init_dev: Cannot open '%s': %i",
2641 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2642 reiserfs_info(super,
2643 "journal_init_dev: journal device: %pg\n",
2649 * When creating/tuning a file system user can assign some
2650 * journal params within boundaries which depend on the ratio
2651 * blocksize/standard_blocksize.
2653 * For blocks >= standard_blocksize transaction size should
2654 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2655 * then JOURNAL_TRANS_MAX_DEFAULT.
2657 * For blocks < standard_blocksize these boundaries should be
2658 * decreased proportionally.
2660 #define REISERFS_STANDARD_BLKSIZE (4096)
2662 static int check_advise_trans_params(struct super_block *sb,
2663 struct reiserfs_journal *journal)
2665 if (journal->j_trans_max) {
2666 /* Non-default journal params. Do sanity check for them. */
2668 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2669 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2671 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2672 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2673 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2674 JOURNAL_MIN_RATIO) {
2675 reiserfs_warning(sb, "sh-462",
2676 "bad transaction max size (%u). "
2677 "FSCK?", journal->j_trans_max);
2680 if (journal->j_max_batch != (journal->j_trans_max) *
2681 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2682 reiserfs_warning(sb, "sh-463",
2683 "bad transaction max batch (%u). "
2684 "FSCK?", journal->j_max_batch);
2689 * Default journal params.
2690 * The file system was created by old version
2691 * of mkreiserfs, so some fields contain zeros,
2692 * and we need to advise proper values for them
2694 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2695 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2699 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2700 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2701 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2706 /* must be called once on fs mount. calls journal_read for you */
2707 int journal_init(struct super_block *sb, const char *j_dev_name,
2708 int old_format, unsigned int commit_max_age)
2710 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2711 struct buffer_head *bhjh;
2712 struct reiserfs_super_block *rs;
2713 struct reiserfs_journal_header *jh;
2714 struct reiserfs_journal *journal;
2715 struct reiserfs_journal_list *jl;
2718 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2720 reiserfs_warning(sb, "journal-1256",
2721 "unable to get memory for journal structure");
2724 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2725 INIT_LIST_HEAD(&journal->j_prealloc_list);
2726 INIT_LIST_HEAD(&journal->j_working_list);
2727 INIT_LIST_HEAD(&journal->j_journal_list);
2728 journal->j_persistent_trans = 0;
2729 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2730 reiserfs_bmap_count(sb)))
2731 goto free_and_return;
2733 allocate_bitmap_nodes(sb);
2735 /* reserved for journal area support */
2736 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2737 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2739 reiserfs_bmap_count(sb) +
2741 REISERFS_DISK_OFFSET_IN_BYTES /
2742 sb->s_blocksize + 2);
2745 * Sanity check to see is the standard journal fitting
2746 * within first bitmap (actual for small blocksizes)
2748 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2749 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2750 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2751 reiserfs_warning(sb, "journal-1393",
2752 "journal does not fit for area addressed "
2753 "by first of bitmap blocks. It starts at "
2754 "%u and its size is %u. Block size %ld",
2755 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2756 SB_ONDISK_JOURNAL_SIZE(sb),
2758 goto free_and_return;
2761 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2762 reiserfs_warning(sb, "sh-462",
2763 "unable to initialize journal device");
2764 goto free_and_return;
2767 rs = SB_DISK_SUPER_BLOCK(sb);
2769 /* read journal header */
2770 bhjh = journal_bread(sb,
2771 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2772 SB_ONDISK_JOURNAL_SIZE(sb));
2774 reiserfs_warning(sb, "sh-459",
2775 "unable to read journal header");
2776 goto free_and_return;
2778 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2780 /* make sure that journal matches to the super block */
2781 if (is_reiserfs_jr(rs)
2782 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2783 sb_jp_journal_magic(rs))) {
2784 reiserfs_warning(sb, "sh-460",
2785 "journal header magic %x (device %pg) does "
2786 "not match to magic found in super block %x",
2787 jh->jh_journal.jp_journal_magic,
2789 sb_jp_journal_magic(rs));
2791 goto free_and_return;
2794 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2795 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2796 journal->j_max_commit_age =
2797 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2798 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2800 if (check_advise_trans_params(sb, journal) != 0)
2801 goto free_and_return;
2802 journal->j_default_max_commit_age = journal->j_max_commit_age;
2804 if (commit_max_age != 0) {
2805 journal->j_max_commit_age = commit_max_age;
2806 journal->j_max_trans_age = commit_max_age;
2809 reiserfs_info(sb, "journal params: device %pg, size %u, "
2810 "journal first block %u, max trans len %u, max batch %u, "
2811 "max commit age %u, max trans age %u\n",
2813 SB_ONDISK_JOURNAL_SIZE(sb),
2814 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2815 journal->j_trans_max,
2816 journal->j_max_batch,
2817 journal->j_max_commit_age, journal->j_max_trans_age);
2821 journal->j_list_bitmap_index = 0;
2822 journal_list_init(sb);
2824 memset(journal->j_list_hash_table, 0,
2825 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2827 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2828 spin_lock_init(&journal->j_dirty_buffers_lock);
2830 journal->j_start = 0;
2832 journal->j_len_alloc = 0;
2833 atomic_set(&journal->j_wcount, 0);
2834 atomic_set(&journal->j_async_throttle, 0);
2835 journal->j_bcount = 0;
2836 journal->j_trans_start_time = 0;
2837 journal->j_last = NULL;
2838 journal->j_first = NULL;
2839 init_waitqueue_head(&journal->j_join_wait);
2840 mutex_init(&journal->j_mutex);
2841 mutex_init(&journal->j_flush_mutex);
2843 journal->j_trans_id = 10;
2844 journal->j_mount_id = 10;
2845 journal->j_state = 0;
2846 atomic_set(&journal->j_jlock, 0);
2847 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2848 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2849 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2850 journal->j_cnode_used = 0;
2851 journal->j_must_wait = 0;
2853 if (journal->j_cnode_free == 0) {
2854 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2855 "allocation failed (%ld bytes). Journal is "
2856 "too large for available memory. Usually "
2857 "this is due to a journal that is too large.",
2858 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2859 goto free_and_return;
2862 init_journal_hash(sb);
2863 jl = journal->j_current_jl;
2866 * get_list_bitmap() may call flush_commit_list() which
2867 * requires the lock. Calling flush_commit_list() shouldn't happen
2868 * this early but I like to be paranoid.
2870 reiserfs_write_lock(sb);
2871 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2872 reiserfs_write_unlock(sb);
2873 if (!jl->j_list_bitmap) {
2874 reiserfs_warning(sb, "journal-2005",
2875 "get_list_bitmap failed for journal list 0");
2876 goto free_and_return;
2879 ret = journal_read(sb);
2881 reiserfs_warning(sb, "reiserfs-2006",
2882 "Replay Failure, unable to mount");
2883 goto free_and_return;
2886 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2887 journal->j_work_sb = sb;
2890 free_journal_ram(sb);
2895 * test for a polite end of the current transaction. Used by file_write,
2896 * and should be used by delete to make sure they don't write more than
2897 * can fit inside a single transaction
2899 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2902 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2903 time64_t now = ktime_get_seconds();
2904 /* cannot restart while nested */
2905 BUG_ON(!th->t_trans_id);
2906 if (th->t_refcount > 1)
2908 if (journal->j_must_wait > 0 ||
2909 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2910 atomic_read(&journal->j_jlock) ||
2911 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2912 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2916 journal->j_len_alloc += new_alloc;
2917 th->t_blocks_allocated += new_alloc ;
2921 /* this must be called inside a transaction */
2922 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2924 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2925 BUG_ON(!th->t_trans_id);
2926 journal->j_must_wait = 1;
2927 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2931 /* this must be called without a transaction started */
2932 void reiserfs_allow_writes(struct super_block *s)
2934 struct reiserfs_journal *journal = SB_JOURNAL(s);
2935 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2936 wake_up(&journal->j_join_wait);
2939 /* this must be called without a transaction started */
2940 void reiserfs_wait_on_write_block(struct super_block *s)
2942 struct reiserfs_journal *journal = SB_JOURNAL(s);
2943 wait_event(journal->j_join_wait,
2944 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2947 static void queue_log_writer(struct super_block *s)
2949 wait_queue_entry_t wait;
2950 struct reiserfs_journal *journal = SB_JOURNAL(s);
2951 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2954 * we don't want to use wait_event here because
2955 * we only want to wait once.
2957 init_waitqueue_entry(&wait, current);
2958 add_wait_queue(&journal->j_join_wait, &wait);
2959 set_current_state(TASK_UNINTERRUPTIBLE);
2960 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2961 int depth = reiserfs_write_unlock_nested(s);
2963 reiserfs_write_lock_nested(s, depth);
2965 __set_current_state(TASK_RUNNING);
2966 remove_wait_queue(&journal->j_join_wait, &wait);
2969 static void wake_queued_writers(struct super_block *s)
2971 struct reiserfs_journal *journal = SB_JOURNAL(s);
2972 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2973 wake_up(&journal->j_join_wait);
2976 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2978 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2979 unsigned long bcount = journal->j_bcount;
2983 depth = reiserfs_write_unlock_nested(sb);
2984 schedule_timeout_uninterruptible(1);
2985 reiserfs_write_lock_nested(sb, depth);
2987 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2988 while ((atomic_read(&journal->j_wcount) > 0 ||
2989 atomic_read(&journal->j_jlock)) &&
2990 journal->j_trans_id == trans_id) {
2991 queue_log_writer(sb);
2993 if (journal->j_trans_id != trans_id)
2995 if (bcount == journal->j_bcount)
2997 bcount = journal->j_bcount;
3002 * join == true if you must join an existing transaction.
3003 * join == false if you can deal with waiting for others to finish
3005 * this will block until the transaction is joinable. send the number of
3006 * blocks you expect to use in nblocks.
3008 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3009 struct super_block *sb, unsigned long nblocks,
3012 time64_t now = ktime_get_seconds();
3013 unsigned int old_trans_id;
3014 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3015 struct reiserfs_transaction_handle myth;
3016 int sched_count = 0;
3020 reiserfs_check_lock_depth(sb, "journal_begin");
3021 BUG_ON(nblocks > journal->j_trans_max);
3023 PROC_INFO_INC(sb, journal.journal_being);
3024 /* set here for journal_join */
3030 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3032 retval = journal->j_errno;
3035 journal->j_bcount++;
3037 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3039 depth = reiserfs_write_unlock_nested(sb);
3040 reiserfs_wait_on_write_block(sb);
3041 reiserfs_write_lock_nested(sb, depth);
3042 PROC_INFO_INC(sb, journal.journal_relock_writers);
3045 now = ktime_get_seconds();
3048 * if there is no room in the journal OR
3049 * if this transaction is too old, and we weren't called joinable,
3050 * wait for it to finish before beginning we don't sleep if there
3051 * aren't other writers
3054 if ((!join && journal->j_must_wait > 0) ||
3056 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3057 || (!join && atomic_read(&journal->j_wcount) > 0
3058 && journal->j_trans_start_time > 0
3059 && (now - journal->j_trans_start_time) >
3060 journal->j_max_trans_age) || (!join
3061 && atomic_read(&journal->j_jlock))
3062 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3064 old_trans_id = journal->j_trans_id;
3065 /* allow others to finish this transaction */
3068 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3069 journal->j_max_batch &&
3070 ((journal->j_len + nblocks + 2) * 100) <
3071 (journal->j_len_alloc * 75)) {
3072 if (atomic_read(&journal->j_wcount) > 10) {
3074 queue_log_writer(sb);
3079 * don't mess with joining the transaction if all we
3080 * have to do is wait for someone else to do a commit
3082 if (atomic_read(&journal->j_jlock)) {
3083 while (journal->j_trans_id == old_trans_id &&
3084 atomic_read(&journal->j_jlock)) {
3085 queue_log_writer(sb);
3089 retval = journal_join(&myth, sb);
3093 /* someone might have ended the transaction while we joined */
3094 if (old_trans_id != journal->j_trans_id) {
3095 retval = do_journal_end(&myth, 0);
3097 retval = do_journal_end(&myth, COMMIT_NOW);
3103 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3106 /* we are the first writer, set trans_id */
3107 if (journal->j_trans_start_time == 0) {
3108 journal->j_trans_start_time = ktime_get_seconds();
3110 atomic_inc(&journal->j_wcount);
3111 journal->j_len_alloc += nblocks;
3112 th->t_blocks_logged = 0;
3113 th->t_blocks_allocated = nblocks;
3114 th->t_trans_id = journal->j_trans_id;
3116 INIT_LIST_HEAD(&th->t_list);
3120 memset(th, 0, sizeof(*th));
3122 * Re-set th->t_super, so we can properly keep track of how many
3123 * persistent transactions there are. We need to do this so if this
3124 * call is part of a failed restart_transaction, we can free it later
3130 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3136 struct reiserfs_transaction_handle *th;
3139 * if we're nesting into an existing transaction. It will be
3140 * persistent on its own
3142 if (reiserfs_transaction_running(s)) {
3143 th = current->journal_info;
3145 BUG_ON(th->t_refcount < 2);
3149 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3152 ret = journal_begin(th, s, nblocks);
3158 SB_JOURNAL(s)->j_persistent_trans++;
3162 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3164 struct super_block *s = th->t_super;
3167 ret = journal_end(th);
3170 if (th->t_refcount == 0) {
3171 SB_JOURNAL(s)->j_persistent_trans--;
3177 static int journal_join(struct reiserfs_transaction_handle *th,
3178 struct super_block *sb)
3180 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3183 * this keeps do_journal_end from NULLing out the
3184 * current->journal_info pointer
3186 th->t_handle_save = cur_th;
3187 BUG_ON(cur_th && cur_th->t_refcount > 1);
3188 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3191 int journal_join_abort(struct reiserfs_transaction_handle *th,
3192 struct super_block *sb)
3194 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3197 * this keeps do_journal_end from NULLing out the
3198 * current->journal_info pointer
3200 th->t_handle_save = cur_th;
3201 BUG_ON(cur_th && cur_th->t_refcount > 1);
3202 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3205 int journal_begin(struct reiserfs_transaction_handle *th,
3206 struct super_block *sb, unsigned long nblocks)
3208 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3211 th->t_handle_save = NULL;
3213 /* we are nesting into the current transaction */
3214 if (cur_th->t_super == sb) {
3215 BUG_ON(!cur_th->t_refcount);
3216 cur_th->t_refcount++;
3217 memcpy(th, cur_th, sizeof(*th));
3218 if (th->t_refcount <= 1)
3219 reiserfs_warning(sb, "reiserfs-2005",
3220 "BAD: refcount <= 1, but "
3221 "journal_info != 0");
3225 * we've ended up with a handle from a different
3226 * filesystem. save it and restore on journal_end.
3227 * This should never really happen...
3229 reiserfs_warning(sb, "clm-2100",
3230 "nesting info a different FS");
3231 th->t_handle_save = current->journal_info;
3232 current->journal_info = th;
3235 current->journal_info = th;
3237 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3238 BUG_ON(current->journal_info != th);
3241 * I guess this boils down to being the reciprocal of clm-2100 above.
3242 * If do_journal_begin_r fails, we need to put it back, since
3243 * journal_end won't be called to do it. */
3245 current->journal_info = th->t_handle_save;
3247 BUG_ON(!th->t_refcount);
3253 * puts bh into the current transaction. If it was already there, reorders
3254 * removes the old pointers from the hash, and puts new ones in (to make
3255 * sure replay happen in the right order).
3257 * if it was dirty, cleans and files onto the clean list. I can't let it
3258 * be dirty again until the transaction is committed.
3260 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3262 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3263 struct buffer_head *bh)
3265 struct super_block *sb = th->t_super;
3266 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3267 struct reiserfs_journal_cnode *cn = NULL;
3268 int count_already_incd = 0;
3270 BUG_ON(!th->t_trans_id);
3272 PROC_INFO_INC(sb, journal.mark_dirty);
3273 if (th->t_trans_id != journal->j_trans_id) {
3274 reiserfs_panic(th->t_super, "journal-1577",
3275 "handle trans id %ld != current trans id %ld",
3276 th->t_trans_id, journal->j_trans_id);
3279 prepared = test_clear_buffer_journal_prepared(bh);
3280 clear_buffer_journal_restore_dirty(bh);
3281 /* already in this transaction, we are done */
3282 if (buffer_journaled(bh)) {
3283 PROC_INFO_INC(sb, journal.mark_dirty_already);
3288 * this must be turned into a panic instead of a warning. We can't
3289 * allow a dirty or journal_dirty or locked buffer to be logged, as
3290 * some changes could get to disk too early. NOT GOOD.
3292 if (!prepared || buffer_dirty(bh)) {
3293 reiserfs_warning(sb, "journal-1777",
3294 "buffer %llu bad state "
3295 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3296 (unsigned long long)bh->b_blocknr,
3297 prepared ? ' ' : '!',
3298 buffer_locked(bh) ? ' ' : '!',
3299 buffer_dirty(bh) ? ' ' : '!',
3300 buffer_journal_dirty(bh) ? ' ' : '!');
3303 if (atomic_read(&journal->j_wcount) <= 0) {
3304 reiserfs_warning(sb, "journal-1409",
3305 "returning because j_wcount was %d",
3306 atomic_read(&journal->j_wcount));
3310 * this error means I've screwed up, and we've overflowed
3311 * the transaction. Nothing can be done here, except make the
3312 * FS readonly or panic.
3314 if (journal->j_len >= journal->j_trans_max) {
3315 reiserfs_panic(th->t_super, "journal-1413",
3316 "j_len (%lu) is too big",
3320 if (buffer_journal_dirty(bh)) {
3321 count_already_incd = 1;
3322 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3323 clear_buffer_journal_dirty(bh);
3326 if (journal->j_len > journal->j_len_alloc) {
3327 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3330 set_buffer_journaled(bh);
3332 /* now put this guy on the end */
3336 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3339 if (th->t_blocks_logged == th->t_blocks_allocated) {
3340 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3341 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3343 th->t_blocks_logged++;
3347 cn->blocknr = bh->b_blocknr;
3350 insert_journal_hash(journal->j_hash_table, cn);
3351 if (!count_already_incd) {
3356 cn->prev = journal->j_last;
3358 if (journal->j_last) {
3359 journal->j_last->next = cn;
3360 journal->j_last = cn;
3362 journal->j_first = cn;
3363 journal->j_last = cn;
3365 reiserfs_schedule_old_flush(sb);
3369 int journal_end(struct reiserfs_transaction_handle *th)
3371 struct super_block *sb = th->t_super;
3372 if (!current->journal_info && th->t_refcount > 1)
3373 reiserfs_warning(sb, "REISER-NESTING",
3374 "th NULL, refcount %d", th->t_refcount);
3376 if (!th->t_trans_id) {
3382 if (th->t_refcount > 0) {
3383 struct reiserfs_transaction_handle *cur_th =
3384 current->journal_info;
3387 * we aren't allowed to close a nested transaction on a
3388 * different filesystem from the one in the task struct
3390 BUG_ON(cur_th->t_super != th->t_super);
3393 memcpy(current->journal_info, th, sizeof(*th));
3398 return do_journal_end(th, 0);
3403 * removes from the current transaction, relsing and descrementing any counters.
3404 * also files the removed buffer directly onto the clean list
3406 * called by journal_mark_freed when a block has been deleted
3408 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3410 static int remove_from_transaction(struct super_block *sb,
3411 b_blocknr_t blocknr, int already_cleaned)
3413 struct buffer_head *bh;
3414 struct reiserfs_journal_cnode *cn;
3415 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3418 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3419 if (!cn || !cn->bh) {
3424 cn->prev->next = cn->next;
3427 cn->next->prev = cn->prev;
3429 if (cn == journal->j_first) {
3430 journal->j_first = cn->next;
3432 if (cn == journal->j_last) {
3433 journal->j_last = cn->prev;
3435 remove_journal_hash(sb, journal->j_hash_table, NULL,
3437 clear_buffer_journaled(bh); /* don't log this one */
3439 if (!already_cleaned) {
3440 clear_buffer_journal_dirty(bh);
3441 clear_buffer_dirty(bh);
3442 clear_buffer_journal_test(bh);
3444 if (atomic_read(&bh->b_count) < 0) {
3445 reiserfs_warning(sb, "journal-1752",
3451 journal->j_len_alloc--;
3457 * for any cnode in a journal list, it can only be dirtied of all the
3458 * transactions that include it are committed to disk.
3459 * this checks through each transaction, and returns 1 if you are allowed
3460 * to dirty, and 0 if you aren't
3462 * it is called by dirty_journal_list, which is called after
3463 * flush_commit_list has gotten all the log blocks for a given
3464 * transaction on disk
3467 static int can_dirty(struct reiserfs_journal_cnode *cn)
3469 struct super_block *sb = cn->sb;
3470 b_blocknr_t blocknr = cn->blocknr;
3471 struct reiserfs_journal_cnode *cur = cn->hprev;
3475 * first test hprev. These are all newer than cn, so any node here
3476 * with the same block number and dev means this node can't be sent
3477 * to disk right now.
3479 while (cur && can_dirty) {
3480 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3481 cur->blocknr == blocknr) {
3487 * then test hnext. These are all older than cn. As long as they
3488 * are committed to the log, it is safe to write cn to disk
3491 while (cur && can_dirty) {
3492 if (cur->jlist && cur->jlist->j_len > 0 &&
3493 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3494 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3503 * syncs the commit blocks, but does not force the real buffers to disk
3504 * will wait until the current transaction is done/committed before returning
3506 int journal_end_sync(struct reiserfs_transaction_handle *th)
3508 struct super_block *sb = th->t_super;
3509 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3511 BUG_ON(!th->t_trans_id);
3512 /* you can sync while nested, very, very bad */
3513 BUG_ON(th->t_refcount > 1);
3514 if (journal->j_len == 0) {
3515 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3517 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3519 return do_journal_end(th, COMMIT_NOW | WAIT);
3522 /* writeback the pending async commits to disk */
3523 static void flush_async_commits(struct work_struct *work)
3525 struct reiserfs_journal *journal =
3526 container_of(work, struct reiserfs_journal, j_work.work);
3527 struct super_block *sb = journal->j_work_sb;
3528 struct reiserfs_journal_list *jl;
3529 struct list_head *entry;
3531 reiserfs_write_lock(sb);
3532 if (!list_empty(&journal->j_journal_list)) {
3533 /* last entry is the youngest, commit it and you get everything */
3534 entry = journal->j_journal_list.prev;
3535 jl = JOURNAL_LIST_ENTRY(entry);
3536 flush_commit_list(sb, jl, 1);
3538 reiserfs_write_unlock(sb);
3542 * flushes any old transactions to disk
3543 * ends the current transaction if it is too old
3545 void reiserfs_flush_old_commits(struct super_block *sb)
3548 struct reiserfs_transaction_handle th;
3549 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3551 now = ktime_get_seconds();
3553 * safety check so we don't flush while we are replaying the log during
3556 if (list_empty(&journal->j_journal_list))
3560 * check the current transaction. If there are no writers, and it is
3561 * too old, finish it, and force the commit blocks to disk
3563 if (atomic_read(&journal->j_wcount) <= 0 &&
3564 journal->j_trans_start_time > 0 &&
3565 journal->j_len > 0 &&
3566 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3567 if (!journal_join(&th, sb)) {
3568 reiserfs_prepare_for_journal(sb,
3569 SB_BUFFER_WITH_SB(sb),
3571 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3574 * we're only being called from kreiserfsd, it makes
3575 * no sense to do an async commit so that kreiserfsd
3578 do_journal_end(&th, COMMIT_NOW | WAIT);
3584 * returns 0 if do_journal_end should return right away, returns 1 if
3585 * do_journal_end should finish the commit
3587 * if the current transaction is too old, but still has writers, this will
3588 * wait on j_join_wait until all the writers are done. By the time it
3589 * wakes up, the transaction it was called has already ended, so it just
3590 * flushes the commit list and returns 0.
3592 * Won't batch when flush or commit_now is set. Also won't batch when
3593 * others are waiting on j_join_wait.
3595 * Note, we can't allow the journal_end to proceed while there are still
3596 * writers in the log.
3598 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3602 int flush = flags & FLUSH_ALL;
3603 int commit_now = flags & COMMIT_NOW;
3604 int wait_on_commit = flags & WAIT;
3605 struct reiserfs_journal_list *jl;
3606 struct super_block *sb = th->t_super;
3607 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3609 BUG_ON(!th->t_trans_id);
3611 if (th->t_trans_id != journal->j_trans_id) {
3612 reiserfs_panic(th->t_super, "journal-1577",
3613 "handle trans id %ld != current trans id %ld",
3614 th->t_trans_id, journal->j_trans_id);
3617 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3618 /* <= 0 is allowed. unmounting might not call begin */
3619 if (atomic_read(&journal->j_wcount) > 0)
3620 atomic_dec(&journal->j_wcount);
3623 * BUG, deal with case where j_len is 0, but people previously
3624 * freed blocks need to be released will be dealt with by next
3625 * transaction that actually writes something, but should be taken
3626 * care of in this trans
3628 BUG_ON(journal->j_len == 0);
3631 * if wcount > 0, and we are called to with flush or commit_now,
3632 * we wait on j_join_wait. We will wake up when the last writer has
3633 * finished the transaction, and started it on its way to the disk.
3634 * Then, we flush the commit or journal list, and just return 0
3635 * because the rest of journal end was already done for this
3638 if (atomic_read(&journal->j_wcount) > 0) {
3639 if (flush || commit_now) {
3642 jl = journal->j_current_jl;
3643 trans_id = jl->j_trans_id;
3645 jl->j_state |= LIST_COMMIT_PENDING;
3646 atomic_set(&journal->j_jlock, 1);
3648 journal->j_next_full_flush = 1;
3653 * sleep while the current transaction is
3656 while (journal->j_trans_id == trans_id) {
3657 if (atomic_read(&journal->j_jlock)) {
3658 queue_log_writer(sb);
3661 if (journal->j_trans_id == trans_id) {
3662 atomic_set(&journal->j_jlock,
3668 BUG_ON(journal->j_trans_id == trans_id);
3671 && journal_list_still_alive(sb, trans_id)
3672 && wait_on_commit) {
3673 flush_commit_list(sb, jl, 1);
3681 /* deal with old transactions where we are the last writers */
3682 now = ktime_get_seconds();
3683 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3685 journal->j_next_async_flush = 1;
3687 /* don't batch when someone is waiting on j_join_wait */
3688 /* don't batch when syncing the commit or flushing the whole trans */
3689 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3690 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3691 && journal->j_len_alloc < journal->j_max_batch
3692 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3693 journal->j_bcount++;
3698 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3699 reiserfs_panic(sb, "journal-003",
3700 "j_start (%ld) is too high",
3707 * Does all the work that makes deleting blocks safe.
3708 * when deleting a block mark BH_JNew, just remove it from the current
3709 * transaction, clean it's buffer_head and move on.
3712 * set a bit for the block in the journal bitmap. That will prevent it from
3713 * being allocated for unformatted nodes before this transaction has finished.
3715 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3716 * That will prevent any old transactions with this block from trying to flush
3717 * to the real location. Since we aren't removing the cnode from the
3718 * journal_list_hash, *the block can't be reallocated yet.
3720 * Then remove it from the current transaction, decrementing any counters and
3721 * filing it on the clean list.
3723 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3724 struct super_block *sb, b_blocknr_t blocknr)
3726 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3727 struct reiserfs_journal_cnode *cn = NULL;
3728 struct buffer_head *bh = NULL;
3729 struct reiserfs_list_bitmap *jb = NULL;
3731 BUG_ON(!th->t_trans_id);
3733 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3738 /* if it is journal new, we just remove it from this transaction */
3739 if (bh && buffer_journal_new(bh)) {
3740 clear_buffer_journal_new(bh);
3741 clear_prepared_bits(bh);
3742 reiserfs_clean_and_file_buffer(bh);
3743 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3746 * set the bit for this block in the journal bitmap
3747 * for this transaction
3749 jb = journal->j_current_jl->j_list_bitmap;
3751 reiserfs_panic(sb, "journal-1702",
3752 "journal_list_bitmap is NULL");
3754 set_bit_in_list_bitmap(sb, blocknr, jb);
3756 /* Note, the entire while loop is not allowed to schedule. */
3759 clear_prepared_bits(bh);
3760 reiserfs_clean_and_file_buffer(bh);
3762 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3765 * find all older transactions with this block,
3766 * make sure they don't try to write it out
3768 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3771 if (sb == cn->sb && blocknr == cn->blocknr) {
3772 set_bit(BLOCK_FREED, &cn->state);
3775 * remove_from_transaction will brelse
3776 * the buffer if it was in the current
3780 clear_buffer_journal_dirty(cn->
3782 clear_buffer_dirty(cn->bh);
3783 clear_buffer_journal_test(cn->
3788 (&cn->bh->b_count) < 0) {
3789 reiserfs_warning(sb,
3791 "cn->bh->b_count < 0");
3795 * since we are clearing the bh,
3796 * we MUST dec nonzerolen
3799 atomic_dec(&cn->jlist->
3810 release_buffer_page(bh); /* get_hash grabs the buffer */
3814 void reiserfs_update_inode_transaction(struct inode *inode)
3816 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3817 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3818 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3822 * returns -1 on error, 0 if no commits/barriers were done and 1
3823 * if a transaction was actually committed and the barrier was done
3825 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3826 struct reiserfs_journal_list *jl)
3828 struct reiserfs_transaction_handle th;
3829 struct super_block *sb = inode->i_sb;
3830 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3834 * is it from the current transaction,
3835 * or from an unknown transaction?
3837 if (id == journal->j_trans_id) {
3838 jl = journal->j_current_jl;
3840 * try to let other writers come in and
3841 * grow this transaction
3843 let_transaction_grow(sb, id);
3844 if (journal->j_trans_id != id) {
3845 goto flush_commit_only;
3848 ret = journal_begin(&th, sb, 1);
3852 /* someone might have ended this transaction while we joined */
3853 if (journal->j_trans_id != id) {
3854 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3856 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3857 ret = journal_end(&th);
3858 goto flush_commit_only;
3861 ret = journal_end_sync(&th);
3867 * this gets tricky, we have to make sure the journal list in
3868 * the inode still exists. We know the list is still around
3869 * if we've got a larger transaction id than the oldest list
3872 if (journal_list_still_alive(inode->i_sb, id)) {
3874 * we only set ret to 1 when we know for sure
3875 * the barrier hasn't been started yet on the commit
3878 if (atomic_read(&jl->j_commit_left) > 1)
3880 flush_commit_list(sb, jl, 1);
3881 if (journal->j_errno)
3882 ret = journal->j_errno;
3885 /* otherwise the list is gone, and long since committed */
3889 int reiserfs_commit_for_inode(struct inode *inode)
3891 unsigned int id = REISERFS_I(inode)->i_trans_id;
3892 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3895 * for the whole inode, assume unset id means it was
3896 * changed in the current transaction. More conservative
3899 reiserfs_update_inode_transaction(inode);
3900 id = REISERFS_I(inode)->i_trans_id;
3901 /* jl will be updated in __commit_trans_jl */
3904 return __commit_trans_jl(inode, id, jl);
3907 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3908 struct buffer_head *bh)
3910 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3911 PROC_INFO_INC(sb, journal.restore_prepared);
3915 if (test_clear_buffer_journal_restore_dirty(bh) &&
3916 buffer_journal_dirty(bh)) {
3917 struct reiserfs_journal_cnode *cn;
3918 reiserfs_write_lock(sb);
3919 cn = get_journal_hash_dev(sb,
3920 journal->j_list_hash_table,
3922 if (cn && can_dirty(cn)) {
3923 set_buffer_journal_test(bh);
3924 mark_buffer_dirty(bh);
3926 reiserfs_write_unlock(sb);
3928 clear_buffer_journal_prepared(bh);
3931 extern struct tree_balance *cur_tb;
3933 * before we can change a metadata block, we have to make sure it won't
3934 * be written to disk while we are altering it. So, we must:
3938 int reiserfs_prepare_for_journal(struct super_block *sb,
3939 struct buffer_head *bh, int wait)
3941 PROC_INFO_INC(sb, journal.prepare);
3943 if (!trylock_buffer(bh)) {
3948 set_buffer_journal_prepared(bh);
3949 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3950 clear_buffer_journal_test(bh);
3951 set_buffer_journal_restore_dirty(bh);
3958 * long and ugly. If flush, will not return until all commit
3959 * blocks and all real buffers in the trans are on disk.
3960 * If no_async, won't return until all commit blocks are on disk.
3962 * keep reading, there are comments as you go along
3964 * If the journal is aborted, we just clean up. Things like flushing
3965 * journal lists, etc just won't happen.
3967 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3969 struct super_block *sb = th->t_super;
3970 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3971 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3972 struct reiserfs_journal_cnode *last_cn = NULL;
3973 struct reiserfs_journal_desc *desc;
3974 struct reiserfs_journal_commit *commit;
3975 struct buffer_head *c_bh; /* commit bh */
3976 struct buffer_head *d_bh; /* desc bh */
3977 int cur_write_start = 0; /* start index of current log write */
3981 struct reiserfs_journal_list *jl, *temp_jl;
3982 struct list_head *entry, *safe;
3983 unsigned long jindex;
3984 unsigned int commit_trans_id;
3988 BUG_ON(th->t_refcount > 1);
3989 BUG_ON(!th->t_trans_id);
3990 BUG_ON(!th->t_super);
3993 * protect flush_older_commits from doing mistakes if the
3994 * transaction ID counter gets overflowed.
3996 if (th->t_trans_id == ~0U)
3997 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3998 flush = flags & FLUSH_ALL;
3999 wait_on_commit = flags & WAIT;
4001 current->journal_info = th->t_handle_save;
4002 reiserfs_check_lock_depth(sb, "journal end");
4003 if (journal->j_len == 0) {
4004 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4006 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4010 if (journal->j_next_full_flush) {
4014 if (journal->j_next_async_flush) {
4015 flags |= COMMIT_NOW | WAIT;
4020 * check_journal_end locks the journal, and unlocks if it does
4021 * not return 1 it tells us if we should continue with the
4022 * journal_end, or just return
4024 if (!check_journal_end(th, flags)) {
4025 reiserfs_schedule_old_flush(sb);
4026 wake_queued_writers(sb);
4027 reiserfs_async_progress_wait(sb);
4031 /* check_journal_end might set these, check again */
4032 if (journal->j_next_full_flush) {
4037 * j must wait means we have to flush the log blocks, and the
4038 * real blocks for this transaction
4040 if (journal->j_must_wait > 0) {
4043 #ifdef REISERFS_PREALLOCATE
4045 * quota ops might need to nest, setup the journal_info pointer
4046 * for them and raise the refcount so that it is > 0.
4048 current->journal_info = th;
4051 /* it should not involve new blocks into the transaction */
4052 reiserfs_discard_all_prealloc(th);
4055 current->journal_info = th->t_handle_save;
4058 /* setup description block */
4061 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4063 set_buffer_uptodate(d_bh);
4064 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4065 memset(d_bh->b_data, 0, d_bh->b_size);
4066 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4067 set_desc_trans_id(desc, journal->j_trans_id);
4070 * setup commit block. Don't write (keep it clean too) this one
4071 * until after everyone else is written
4073 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4074 ((journal->j_start + journal->j_len +
4075 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4076 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4077 memset(c_bh->b_data, 0, c_bh->b_size);
4078 set_commit_trans_id(commit, journal->j_trans_id);
4079 set_buffer_uptodate(c_bh);
4081 /* init this journal list */
4082 jl = journal->j_current_jl;
4085 * we lock the commit before doing anything because
4086 * we want to make sure nobody tries to run flush_commit_list until
4087 * the new transaction is fully setup, and we've already flushed the
4090 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4092 /* save the transaction id in case we need to commit it later */
4093 commit_trans_id = jl->j_trans_id;
4095 atomic_set(&jl->j_older_commits_done, 0);
4096 jl->j_trans_id = journal->j_trans_id;
4097 jl->j_timestamp = journal->j_trans_start_time;
4098 jl->j_commit_bh = c_bh;
4099 jl->j_start = journal->j_start;
4100 jl->j_len = journal->j_len;
4101 atomic_set(&jl->j_nonzerolen, journal->j_len);
4102 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4103 jl->j_realblock = NULL;
4106 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4107 * for each real block, add it to the journal list hash,
4108 * copy into real block index array in the commit or desc block
4110 trans_half = journal_trans_half(sb->s_blocksize);
4111 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4112 if (buffer_journaled(cn->bh)) {
4113 jl_cn = get_cnode(sb);
4115 reiserfs_panic(sb, "journal-1676",
4116 "get_cnode returned NULL");
4119 jl->j_realblock = jl_cn;
4121 jl_cn->prev = last_cn;
4124 last_cn->next = jl_cn;
4128 * make sure the block we are trying to log
4129 * is not a block of journal or reserved area
4131 if (is_block_in_log_or_reserved_area
4132 (sb, cn->bh->b_blocknr)) {
4133 reiserfs_panic(sb, "journal-2332",
4134 "Trying to log block %lu, "
4135 "which is a log block",
4138 jl_cn->blocknr = cn->bh->b_blocknr;
4143 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4144 if (i < trans_half) {
4145 desc->j_realblock[i] =
4146 cpu_to_le32(cn->bh->b_blocknr);
4148 commit->j_realblock[i - trans_half] =
4149 cpu_to_le32(cn->bh->b_blocknr);
4155 set_desc_trans_len(desc, journal->j_len);
4156 set_desc_mount_id(desc, journal->j_mount_id);
4157 set_desc_trans_id(desc, journal->j_trans_id);
4158 set_commit_trans_len(commit, journal->j_len);
4161 * special check in case all buffers in the journal
4162 * were marked for not logging
4164 BUG_ON(journal->j_len == 0);
4167 * we're about to dirty all the log blocks, mark the description block
4168 * dirty now too. Don't mark the commit block dirty until all the
4169 * others are on disk
4171 mark_buffer_dirty(d_bh);
4174 * first data block is j_start + 1, so add one to
4175 * cur_write_start wherever you use it
4177 cur_write_start = journal->j_start;
4178 cn = journal->j_first;
4179 jindex = 1; /* start at one so we don't get the desc again */
4181 clear_buffer_journal_new(cn->bh);
4182 /* copy all the real blocks into log area. dirty log blocks */
4183 if (buffer_journaled(cn->bh)) {
4184 struct buffer_head *tmp_bh;
4189 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4192 SB_ONDISK_JOURNAL_SIZE(sb)));
4193 set_buffer_uptodate(tmp_bh);
4194 page = cn->bh->b_page;
4196 memcpy(tmp_bh->b_data,
4197 addr + offset_in_page(cn->bh->b_data),
4200 mark_buffer_dirty(tmp_bh);
4202 set_buffer_journal_dirty(cn->bh);
4203 clear_buffer_journaled(cn->bh);
4206 * JDirty cleared sometime during transaction.
4207 * don't log this one
4209 reiserfs_warning(sb, "journal-2048",
4210 "BAD, buffer in journal hash, "
4217 reiserfs_cond_resched(sb);
4221 * we are done with both the c_bh and d_bh, but
4222 * c_bh must be written after all other commit blocks,
4223 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4226 journal->j_current_jl = alloc_journal_list(sb);
4228 /* now it is safe to insert this transaction on the main list */
4229 list_add_tail(&jl->j_list, &journal->j_journal_list);
4230 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4231 journal->j_num_work_lists++;
4233 /* reset journal values for the next transaction */
4235 (journal->j_start + journal->j_len +
4236 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4237 atomic_set(&journal->j_wcount, 0);
4238 journal->j_bcount = 0;
4239 journal->j_last = NULL;
4240 journal->j_first = NULL;
4242 journal->j_trans_start_time = 0;
4243 /* check for trans_id overflow */
4244 if (++journal->j_trans_id == 0)
4245 journal->j_trans_id = 10;
4246 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4247 journal->j_must_wait = 0;
4248 journal->j_len_alloc = 0;
4249 journal->j_next_full_flush = 0;
4250 journal->j_next_async_flush = 0;
4251 init_journal_hash(sb);
4254 * make sure reiserfs_add_jh sees the new current_jl before we
4255 * write out the tails
4260 * tail conversion targets have to hit the disk before we end the
4261 * transaction. Otherwise a later transaction might repack the tail
4262 * before this transaction commits, leaving the data block unflushed
4263 * and clean, if we crash before the later transaction commits, the
4264 * data block is lost.
4266 if (!list_empty(&jl->j_tail_bh_list)) {
4267 depth = reiserfs_write_unlock_nested(sb);
4268 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4269 journal, jl, &jl->j_tail_bh_list);
4270 reiserfs_write_lock_nested(sb, depth);
4272 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4273 mutex_unlock(&jl->j_commit_mutex);
4276 * honor the flush wishes from the caller, simple commits can
4277 * be done outside the journal lock, they are done below
4279 * if we don't flush the commit list right now, we put it into
4280 * the work queue so the people waiting on the async progress work
4281 * queue don't wait for this proc to flush journal lists and such.
4284 flush_commit_list(sb, jl, 1);
4285 flush_journal_list(sb, jl, 1);
4286 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4288 * Avoid queueing work when sb is being shut down. Transaction
4289 * will be flushed on journal shutdown.
4291 if (sb->s_flags & SB_ACTIVE)
4292 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4293 &journal->j_work, HZ / 10);
4297 * if the next transaction has any chance of wrapping, flush
4298 * transactions that might get overwritten. If any journal lists
4299 * are very old flush them as well.
4302 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4303 temp_jl = JOURNAL_LIST_ENTRY(entry);
4304 if (journal->j_start <= temp_jl->j_start) {
4305 if ((journal->j_start + journal->j_trans_max + 1) >=
4307 flush_used_journal_lists(sb, temp_jl);
4309 } else if ((journal->j_start +
4310 journal->j_trans_max + 1) <
4311 SB_ONDISK_JOURNAL_SIZE(sb)) {
4313 * if we don't cross into the next
4314 * transaction and we don't wrap, there is
4315 * no way we can overlap any later transactions
4320 } else if ((journal->j_start +
4321 journal->j_trans_max + 1) >
4322 SB_ONDISK_JOURNAL_SIZE(sb)) {
4323 if (((journal->j_start + journal->j_trans_max + 1) %
4324 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4326 flush_used_journal_lists(sb, temp_jl);
4330 * we don't overlap anything from out start
4331 * to the end of the log, and our wrapped
4332 * portion doesn't overlap anything at
4333 * the start of the log. We can break
4340 journal->j_current_jl->j_list_bitmap =
4341 get_list_bitmap(sb, journal->j_current_jl);
4343 if (!(journal->j_current_jl->j_list_bitmap)) {
4344 reiserfs_panic(sb, "journal-1996",
4345 "could not get a list bitmap");
4348 atomic_set(&journal->j_jlock, 0);
4350 /* wake up any body waiting to join. */
4351 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4352 wake_up(&journal->j_join_wait);
4354 if (!flush && wait_on_commit &&
4355 journal_list_still_alive(sb, commit_trans_id)) {
4356 flush_commit_list(sb, jl, 1);
4359 reiserfs_check_lock_depth(sb, "journal end2");
4361 memset(th, 0, sizeof(*th));
4363 * Re-set th->t_super, so we can properly keep track of how many
4364 * persistent transactions there are. We need to do this so if this
4365 * call is part of a failed restart_transaction, we can free it later
4369 return journal->j_errno;
4372 /* Send the file system read only and refuse new transactions */
4373 void reiserfs_abort_journal(struct super_block *sb, int errno)
4375 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4376 if (test_bit(J_ABORTED, &journal->j_state))
4379 if (!journal->j_errno)
4380 journal->j_errno = errno;
4382 sb->s_flags |= SB_RDONLY;
4383 set_bit(J_ABORTED, &journal->j_state);
4385 #ifdef CONFIG_REISERFS_CHECK