From: Alex Elder Date: Thu, 19 Jul 2012 13:49:18 +0000 (-0500) Subject: rbd: set snapc->seq only when refreshing header X-Git-Tag: firefly_0821_release~3680^2~2292^2~38 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=505cbb9bedc8c609c31d86ff4f8f656e5a0f9c49;p=firefly-linux-kernel-4.4.55.git rbd: set snapc->seq only when refreshing header In rbd_header_add_snap() there is code to set snapc->seq to the just-added snapshot id. This is the only remnant left of the use of that field for recording which snapshot an rbd_dev was associated with. That functionality is no longer supported, so get rid of that final bit of code. Doing so means we never actually set snapc->seq any more. On the server, the snapshot context's sequence value represents the highest snapshot id ever issued for a particular rbd image. So we'll make it have that meaning here as well. To do so, set this value whenever the rbd header is (re-)read. That way it will always be consistent with the rest of the snapshot context we maintain. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index ac8a83fc2ad9..c299a55e3ff1 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -537,6 +537,7 @@ static int rbd_header_from_disk(struct rbd_image_header *header, atomic_set(&header->snapc->nref, 1); header->snap_seq = le64_to_cpu(ondisk->snap_seq); + header->snapc->seq = le64_to_cpu(ondisk->snap_seq); header->snapc->num_snaps = snap_count; header->total_snaps = snap_count; @@ -1685,14 +1686,7 @@ static int rbd_header_add_snap(struct rbd_device *rbd_dev, kfree(data); - if (ret < 0) - return ret; - - down_write(&rbd_dev->header_rwsem); - rbd_dev->header.snapc->seq = new_snapid; - up_write(&rbd_dev->header_rwsem); - - return 0; + return ret < 0 ? ret : 0; bad: return -ERANGE; }