Patch "bcache: Journal replay fix" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    bcache: Journal replay fix

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-journal-replay-fix.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 <stable@xxxxxxxxxxxxxxx> know about it.


>From faa5673617656ee58369a3cfe4a312cfcdc59c81 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Date: Thu, 11 Jul 2013 22:42:14 -0700
Subject: bcache: Journal replay fix

From: Kent Overstreet <kmo@xxxxxxxxxxxxx>

commit faa5673617656ee58369a3cfe4a312cfcdc59c81 upstream.

The journal replay code starts by finding something that looks like a
valid journal entry, then it does a binary search over the unchecked
region of the journal for the journal entries with the highest sequence
numbers.

Trouble is, the logic was wrong - journal_read_bucket() returns true if
it found journal entries we need, but if the range of journal entries
we're looking for loops around the end of the journal - in that case
journal_read_bucket() could return true when it hadn't found the highest
sequence number we'd seen yet, and in that case the binary search did
the wrong thing. Whoops.

Signed-off-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/md/bcache/journal.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -182,9 +182,14 @@ bsearch:
 		pr_debug("starting binary search, l %u r %u", l, r);
 
 		while (l + 1 < r) {
+			seq = list_entry(list->prev, struct journal_replay,
+					 list)->j.seq;
+
 			m = (l + r) >> 1;
+			read_bucket(m);
 
-			if (read_bucket(m))
+			if (seq != list_entry(list->prev, struct journal_replay,
+					      list)->j.seq)
 				l = m;
 			else
 				r = m;


Patches currently in stable-queue which might be from kmo@xxxxxxxxxxxxx are

queue-3.10/bcache-fix-a-dumb-race.patch
queue-3.10/bcache-advertise-that-flushes-are-supported.patch
queue-3.10/bcache-fix-gc_sectors_used-calculation.patch
queue-3.10/bcache-shutdown-fix.patch
queue-3.10/bcache-journal-replay-fix.patch
queue-3.10/bcache-fix-a-sysfs-splat-on-shutdown.patch
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