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rbd: clean up a few things in the refresh path

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This includes a few relatively small fixes I found while examining
the code that refreshes image information.

This resolves:
    http://tracker.ceph.com/issues/5040

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-05-29 11:18:59 -05:00 committed by Sage Weil
parent e215605417
commit 3b5cf2a2f1
1 changed files with 43 additions and 10 deletions
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53
drivers/block/rbd.c
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@ -2860,7 +2860,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
(unsigned int)opcode);
ret = rbd_dev_refresh(rbd_dev);
if (ret)
rbd_warn(rbd_dev, ": header refresh error (%d)\n", ret);
rbd_warn(rbd_dev, "header refresh error (%d)\n", ret);
rbd_obj_notify_ack(rbd_dev, notify_id);
}
@ -3340,8 +3340,8 @@ static int rbd_dev_refresh(struct rbd_device *rbd_dev)
int ret;
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
mapping_size = rbd_dev->mapping.size;
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
mapping_size = rbd_dev->mapping.size;
if (rbd_dev->image_format == 1)
ret = rbd_dev_v1_header_info(rbd_dev);
else
@ -3814,6 +3814,7 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
void *end;
u64 pool_id;
char *image_id;
u64 snap_id;
u64 overlap;
int ret;
@ -3873,24 +3874,56 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
(unsigned long long)pool_id, U32_MAX);
goto out_err;
}
parent_spec->pool_id = pool_id;
image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
if (IS_ERR(image_id)) {
ret = PTR_ERR(image_id);
goto out_err;
}
parent_spec->image_id = image_id;
ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err);
ceph_decode_64_safe(&p, end, snap_id, out_err);
ceph_decode_64_safe(&p, end, overlap, out_err);
if (overlap) {
rbd_spec_put(rbd_dev->parent_spec);
/*
* The parent won't change (except when the clone is
* flattened, already handled that). So we only need to
* record the parent spec we have not already done so.
*/
if (!rbd_dev->parent_spec) {
parent_spec->pool_id = pool_id;
parent_spec->image_id = image_id;
parent_spec->snap_id = snap_id;
rbd_dev->parent_spec = parent_spec;
parent_spec = NULL; /* rbd_dev now owns this */
rbd_dev->parent_overlap = overlap;
} else {
rbd_warn(rbd_dev, "ignoring parent of clone with overlap 0\n");
}
/*
* We always update the parent overlap. If it's zero we
* treat it specially.
*/
rbd_dev->parent_overlap = overlap;
smp_mb();
if (!overlap) {
/* A null parent_spec indicates it's the initial probe */
if (parent_spec) {
/*
* The overlap has become zero, so the clone
* must have been resized down to 0 at some
* point. Treat this the same as a flatten.
*/
rbd_dev_parent_put(rbd_dev);
pr_info("%s: clone image now standalone\n",
rbd_dev->disk->disk_name);
} else {
/*
* For the initial probe, if we find the
* overlap is zero we just pretend there was
* no parent image.
*/
rbd_warn(rbd_dev, "ignoring parent of "
"clone with overlap 0\n");
}
}
out:
ret = 0;