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rbd: move more initialization into rbd_dev_image_probe()

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Move a block of initialization related to the "ceph-side" of an rbd
image out of rbd_dev_probe_finish() and into rbd_dev_image_probe().

Add appropriate error handling to clean things up in the event any
of these new functions return an error.

We know that rbd_dev_snaps_update(), rbd_dev_spec_update(), and
rbd_dev_probe_parent() all clean up after themselves before they
return an error, so no special cleanup is required except when an
earlier call succeeds.  Since rbd_dev_spec_update() only updates the
spec field (whose cleanup will be handled by dropping the last
reference to the spec) there is no cleanup action associatied with
that.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-04-27 09:59:30 -05:00 committed by Sage Weil
parent 5de10f3b0c
commit 9bb81c9be9
1 changed files with 20 additions and 20 deletions
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40
drivers/block/rbd.c
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@ -4755,26 +4755,13 @@ static int rbd_dev_probe_finish(struct rbd_device *rbd_dev)
{
int ret;
/* no need to lock here, as rbd_dev is not registered yet */
ret = rbd_dev_snaps_update(rbd_dev);
ret = rbd_dev_header_watch_sync(rbd_dev, 1);
if (ret)
return ret;
ret = rbd_dev_spec_update(rbd_dev);
if (ret)
goto err_out_snaps;
ret = rbd_dev_header_watch_sync(rbd_dev, 1);
if (ret)
goto err_out_snaps;
ret = rbd_dev_mapping_set(rbd_dev);
if (ret)
goto err_out_snaps;
ret = rbd_dev_probe_parent(rbd_dev);
if (ret)
goto err_out_mapping;
return ret;
/* generate unique id: find highest unique id, add one */
rbd_dev_id_get(rbd_dev);
@ -4818,11 +4805,7 @@ err_out_blkdev:
unregister_blkdev(rbd_dev->major, rbd_dev->name);
err_out_id:
rbd_dev_id_put(rbd_dev);
rbd_dev_remove_parent(rbd_dev);
err_out_mapping:
rbd_dev_mapping_clear(rbd_dev);
err_out_snaps:
rbd_remove_all_snaps(rbd_dev);
return ret;
}
@ -4854,11 +4837,28 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev)
if (ret)
goto out_err;
ret = rbd_dev_snaps_update(rbd_dev);
if (ret)
goto out_err;
ret = rbd_dev_spec_update(rbd_dev);
if (ret)
goto err_out_snaps;
ret = rbd_dev_probe_parent(rbd_dev);
if (ret)
goto err_out_snaps;
ret = rbd_dev_probe_finish(rbd_dev);
if (ret)
rbd_header_free(&rbd_dev->header);
goto err_out_parent;
return ret;
err_out_parent:
rbd_dev_remove_parent(rbd_dev);
rbd_header_free(&rbd_dev->header);
err_out_snaps:
rbd_remove_all_snaps(rbd_dev);
out_err:
kfree(rbd_dev->spec->image_id);
rbd_dev->spec->image_id = NULL;