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| author | Josh Durgin <josh.durgin@dreamhost.com> | 2011-12-05 10:47:13 -0800 |
|---|---|---|
| committer | Alex Elder <elder@dreamhost.com> | 2012-05-14 12:12:46 -0500 |
| commit | 403f24d3d51760a8b9368d595fa5f48c309f1a0f (patch) | |
| tree | 672324db44b12186b91235f293b971bb00cf377d | |
| parent | 50f7c4c967d0b5acd8e7ba6ab654dc4a7ac869ac (diff) | |
| download | linux-403f24d3d51760a8b9368d595fa5f48c309f1a0f.tar.bz2 | |
rbd: protect read of snapshot sequence number
This is updated whenever a snapshot is added or deleted, and the
snapc pointer is changed with every refresh of the header.
Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
Reviewed-by: Alex Elder <elder@dreamhost.com>
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
| -rw-r--r-- | drivers/block/rbd.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index a75fe93a25b1..5ab9f55d3e0c 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -1684,7 +1684,9 @@ static int rbd_header_add_snap(struct rbd_device *dev, if (ret < 0) return ret; - dev->header.snapc->seq = new_snapid; + down_write(&dev->header_rwsem); + dev->header.snapc->seq = new_snapid; + up_write(&dev->header_rwsem); return 0; bad: |