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authorMike Snitzer <snitzer@redhat.com>2013-05-10 14:37:14 +0100
committerAlasdair G Kergon <agk@redhat.com>2013-05-10 14:37:14 +0100
commitd793e684277124d55c5d2444007e224635821346 (patch)
treee4ce5af71082bdec32105a68c8405405273c1f90 /drivers
parentebb37277796269da36a8bc5d72ed1e8e1fb7d34b (diff)
downloadlinux-linaro-stable-d793e684277124d55c5d2444007e224635821346.tar.gz
dm stripe: fix regression in stripe_width calculation
Fix a regression in the calculation of the stripe_width in the dm stripe target which led to incorrect processing of device limits. The stripe_width is the stripe device length divided by the number of stripes. The group of commits in the range f14fa69 ("dm stripe: fix size test") to eb850de ("dm stripe: support for non power of 2 chunksize") interfered with each other (a merging error) and led to the stripe_width being set incorrectly to the stripe device length divided by chunk_size * stripe_count. For example, a stripe device's table with: 0 33553920 striped 3 512 ... should result in a stripe_width of 11184640 (33553920 / 3), but due to the bug it was getting set to 21845 (33553920 / (512 * 3)). The impact of this bug is that device topologies that previously worked fine with the stripe target are no longer considered valid. In particular, there is a higher risk of seeing this issue if one of the stripe devices has a 4K logical block size. Resulting in an error message like this: "device-mapper: table: 253:4: len=21845 not aligned to h/w logical block size 4096 of dm-1" The fix is to swap the order of the divisions and to use a temporary variable for the second one, so that width retains the intended value. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org # 3.6+ Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-stripe.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index ea5e878a30b9..d907ca6227ce 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -94,7 +94,7 @@ static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct stripe_c *sc;
- sector_t width;
+ sector_t width, tmp_len;
uint32_t stripes;
uint32_t chunk_size;
int r;
@@ -116,15 +116,16 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
width = ti->len;
- if (sector_div(width, chunk_size)) {
+ if (sector_div(width, stripes)) {
ti->error = "Target length not divisible by "
- "chunk size";
+ "number of stripes";
return -EINVAL;
}
- if (sector_div(width, stripes)) {
+ tmp_len = width;
+ if (sector_div(tmp_len, chunk_size)) {
ti->error = "Target length not divisible by "
- "number of stripes";
+ "chunk size";
return -EINVAL;
}