From 651385e4bbbff823f111e4e8a68b2e1613c34c79 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 16 Oct 2009 23:18:16 +0100 Subject: [PATCH] dm snapshot: lock snapshot while supplying status commit 4c6fff445d7aa753957856278d4d93bcad6e2c14 upstream. This patch locks the snapshot when returning status. It fixes a race when it could return an invalid number of free chunks if someone was simultaneously modifying it. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-snap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 53f4063f7ea4..b9dd22ce47d4 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -1147,6 +1147,8 @@ static int snapshot_status(struct dm_target *ti, status_type_t type, unsigned sz = 0; struct dm_snapshot *snap = ti->private; + down_write(&snap->lock); + switch (type) { case STATUSTYPE_INFO: if (!snap->valid) @@ -1178,6 +1180,8 @@ static int snapshot_status(struct dm_target *ti, status_type_t type, break; } + up_write(&snap->lock); + return 0; } -- 2.39.5