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rbd: set snapc->seq only when refreshing header

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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 <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-07-19 08:49:18 -05:00 committed by Sage Weil
parent 78dc447d3c
commit 505cbb9bed
1 changed files with 2 additions and 8 deletions
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10
drivers/block/rbd.c
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@ -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;
}