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rbd: simplify rbd_dev_v1_probe()

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An rbd_dev structure's fields are all zero-filled for an initial
probe, so there's no need to explicitly zero the parent_spec
and parent_overlap fields in rbd_dev_v1_probe().  Removing these
assignments makes rbd_dev_v1_probe() *almost* trivial.

Move the dout() message that announces discovery of an image into
rbd_dev_image_probe(), generalize to support images in either format
and only show it if an image is fully discovered.

This highlights that are some unnecessary cleanups in the error
path for rbd_dev_v1_probe(), so they can be removed.

Now rbd_dev_v1_probe() *is* a trivial wrapper function.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-05-06 09:51:30 -05:00
parent 662518b128
commit 30d60ba2f2
1 changed files with 7 additions and 30 deletions
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37
drivers/block/rbd.c
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@ -4469,31 +4469,7 @@ static void rbd_dev_unprobe(struct rbd_device *rbd_dev)
static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) static int rbd_dev_v1_probe(struct rbd_device *rbd_dev)
{ {
int ret; return rbd_dev_v1_header_read(rbd_dev);
/* Populate rbd image metadata */
ret = rbd_dev_v1_header_read(rbd_dev);
if (ret < 0)
goto out_err;
/* Version 1 images have no parent (no layering) */
rbd_dev->parent_spec = NULL;
rbd_dev->parent_overlap = 0;
dout("discovered version 1 image, header name is %s\n",
rbd_dev->header_name);
return 0;
out_err:
kfree(rbd_dev->header_name);
rbd_dev->header_name = NULL;
kfree(rbd_dev->spec->image_id);
rbd_dev->spec->image_id = NULL;
return ret;
} }
static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
@ -4553,9 +4529,6 @@ static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
if (ret) if (ret)
goto out_err; goto out_err;
dout("discovered version 2 image, header name is %s\n",
rbd_dev->header_name);
return 0; return 0;
out_err: out_err:
rbd_dev->parent_overlap = 0; rbd_dev->parent_overlap = 0;
@ -4758,9 +4731,13 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool read_only)
rbd_dev->mapping.read_only = read_only; rbd_dev->mapping.read_only = read_only;
ret = rbd_dev_probe_parent(rbd_dev); ret = rbd_dev_probe_parent(rbd_dev);
if (!ret) if (ret)
return 0; goto err_out_probe;
dout("discovered format %u image, header name is %s\n",
rbd_dev->image_format, rbd_dev->header_name);
return 0;
err_out_probe: err_out_probe:
rbd_dev_unprobe(rbd_dev); rbd_dev_unprobe(rbd_dev);
err_out_watch: err_out_watch: