This is a note to let you know that I've just added the patch titled
bcache: Fix for when no journal entries are found
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcache-fix-for-when-no-journal-entries-are-found.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c426c4fd46f709ade2bddd51c5738729c7ae1db5 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <[email protected]>
Date: Mon, 23 Sep 2013 23:17:29 -0700
Subject: bcache: Fix for when no journal entries are found
From: Kent Overstreet <[email protected]>
commit c426c4fd46f709ade2bddd51c5738729c7ae1db5 upstream.
The journal replay code didn't handle this case, causing it to go into
an infinite loop...
Signed-off-by: Kent Overstreet <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/md/bcache/journal.c | 30 ++++++++++++++++++------------
1 file changed, 18 insertions(+), 12 deletions(-)
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -151,7 +151,8 @@ int bch_journal_read(struct cache_set *c
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++) {
@@ -164,18 +165,20 @@ int bch_journal_read(struct cache_set *c
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);
@@ -195,10 +198,12 @@ 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) {
@@ -226,9 +231,10 @@ 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
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/bcache-fix-a-flush-fua-performance-bug.patch
queue-3.10/bcache-fix-for-when-no-journal-entries-are-found.patch
queue-3.10/block-fix-bio_copy_data.patch
queue-3.10/bcache-fix-for-handling-overlapping-extents-when-reading-in-a-btree-node.patch
queue-3.10/bcache-fix-a-dumb-cpu-spinning-bug-in-writeback.patch
queue-3.10/bcache-strip-endline-when-writing-the-label-through-sysfs.patch
queue-3.10/bcache-fix-flushes-in-writeback-mode.patch
queue-3.10/bcache-fix-a-shrinker-deadlock.patch
queue-3.10/bcache-fix-a-writeback-performance-regression.patch
queue-3.10/bcache-fix-a-dumb-journal-discard-bug.patch
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