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| author | Mikulas Patocka <mpatocka@redhat.com> | 2021-01-23 15:19:56 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2021-02-03 16:10:05 +0100 |
| commit | cb728484a7710c202f02b96aa0962ce9b07aa5c2 (patch) | |
| tree | 571ea5b9d22f486c26c06a3d2641d704e20bc9ac /drivers/md | |
| parent | dm integrity: introduce the "fix_hmac" argument (diff) | |
| download | linux-cb728484a7710c202f02b96aa0962ce9b07aa5c2.tar.xz linux-cb728484a7710c202f02b96aa0962ce9b07aa5c2.zip | |
dm writecache: fix performance degradation in ssd mode
Fix a thinko in ssd_commit_superblock. region.count is in sectors, not
bytes. This bug doesn't corrupt data, but it causes performance
degradation.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: dc8a01ae1dbd ("dm writecache: optimize superblock write")
Cc: stable@vger.kernel.org # v5.7+
Reported-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-writecache.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index d5223a0e5cc5..1769653c3d6b 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -523,7 +523,7 @@ static void ssd_commit_superblock(struct dm_writecache *wc) region.bdev = wc->ssd_dev->bdev; region.sector = 0; - region.count = PAGE_SIZE; + region.count = PAGE_SIZE >> SECTOR_SHIFT; if (unlikely(region.sector + region.count > wc->metadata_sectors)) region.count = wc->metadata_sectors - region.sector; |