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| author | NeilBrown <neilb@suse.de> | 2012-01-09 01:41:51 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-01-11 08:35:17 +1100 |
| commit | 307729c8bc5b5a41361af8af95906eee7552acb1 (patch) | |
| tree | 9b20fe9c898ee4de85b64a8e41c92123dae0b093 /drivers/md | |
| parent | f2a371c5e74dd5685ab47effa4ac7b23b1fdaae5 (diff) | |
| download | linux-307729c8bc5b5a41361af8af95906eee7552acb1.tar.gz linux-307729c8bc5b5a41361af8af95906eee7552acb1.tar.bz2 linux-307729c8bc5b5a41361af8af95906eee7552acb1.zip | |
md/raid1: perform bad-block tests for WriteMostly devices too.
We normally try to avoid reading from write-mostly devices, but when
we do we really have to check for bad blocks and be sure not to
try reading them.
With the current code, best_good_sectors might not get set and that
causes zero-length read requests to be send down which is very
confusing.
This bug was introduced in commit d2eb35acfdccbe2 and so the patch
is suitable for 3.1.x and 3.2.x
Reported-and-tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reported-and-tested-by: Art -kwaak- van Breemen <ard@telegraafnet.nl>
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid1.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index cc24f0cb7ee3..a368db2431a5 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -531,8 +531,17 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect if (test_bit(WriteMostly, &rdev->flags)) { /* Don't balance among write-mostly, just * use the first as a last resort */ - if (best_disk < 0) + if (best_disk < 0) { + if (is_badblock(rdev, this_sector, sectors, + &first_bad, &bad_sectors)) { + if (first_bad < this_sector) + /* Cannot use this */ + continue; + best_good_sectors = first_bad - this_sector; + } else + best_good_sectors = sectors; best_disk = disk; + } continue; } /* This is a reasonable device to use. It might |