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| author | Kent Overstreet <kmo@daterainc.com> | 2013-07-12 09:42:14 +0400 |
|---|---|---|
| committer | Kent Overstreet <kmo@daterainc.com> | 2013-07-12 11:22:48 +0400 |
| commit | faa5673617656ee58369a3cfe4a312cfcdc59c81 (patch) | |
| tree | 856e124ab4abab846bea0cdca7e41581eddf061f | |
| parent | 5caa52afc5abd1396e4af720469abb5843a71eb8 (diff) | |
| download | linux-faa5673617656ee58369a3cfe4a312cfcdc59c81.tar.xz | |
bcache: Journal replay fix
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@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
| -rw-r--r-- | drivers/md/bcache/journal.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c index 4b250667bb7f..ba95ab84b2be 100644 --- a/drivers/md/bcache/journal.c +++ b/drivers/md/bcache/journal.c @@ -184,9 +184,14 @@ 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; |