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bcache: Fix for when no journal entries are found 

The journal replay code didn't handle this case, causing it to go into
an infinite loop...

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kent Overstreet 2013-09-23 23:17:29 -07:00 committed by Linus Torvalds
parent aee6f1cfff
commit c426c4fd46
1 changed files with 18 additions and 12 deletions
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30
drivers/md/bcache/journal.c
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@ -153,7 +153,8 @@ int bch_journal_read(struct cache_set *c, struct list_head *list,
bitmap_zero(bitmap, SB_JOURNAL_BUCKETS);
pr_debug("%u journal buckets", ca->sb.njournal_buckets);
/* Read journal buckets ordered by golden ratio hash to quickly
/*
* Read journal buckets ordered by golden ratio hash to quickly
* find a sequence of buckets with valid journal entries
*/
for (i = 0; i < ca->sb.njournal_buckets; i++) {
@ -166,18 +167,20 @@ int bch_journal_read(struct cache_set *c, struct list_head *list,
goto bsearch;
}
/* If that fails, check all the buckets we haven't checked
/*
* If that fails, check all the buckets we haven't checked
* already
*/
pr_debug("falling back to linear search");
for (l = 0; l < ca->sb.njournal_buckets; l++) {
if (test_bit(l, bitmap))
continue;
for (l = find_first_zero_bit(bitmap, ca->sb.njournal_buckets);
l < ca->sb.njournal_buckets;
l = find_next_zero_bit(bitmap, ca->sb.njournal_buckets, l + 1))
if (read_bucket(l))
goto bsearch;
}
if (list_empty(list))
continue;
bsearch:
/* Binary search */
m = r = find_next_bit(bitmap, ca->sb.njournal_buckets, l + 1);
@ -197,10 +200,12 @@ bsearch:
r = m;
}
/* Read buckets in reverse order until we stop finding more
/*
* Read buckets in reverse order until we stop finding more
* journal entries
*/
pr_debug("finishing up");
pr_debug("finishing up: m %u njournal_buckets %u",
m, ca->sb.njournal_buckets);
l = m;
while (1) {
@ -228,9 +233,10 @@ bsearch:
}
}
c->journal.seq = list_entry(list->prev,
struct journal_replay,
list)->j.seq;
if (!list_empty(list))
c->journal.seq = list_entry(list->prev,
struct journal_replay,
list)->j.seq;
return 0;
#undef read_bucket