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Commit 30d60ba2 authored by Alex Elder's avatar Alex Elder
Browse files

rbd: simplify rbd_dev_v1_probe() 



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: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent 662518b1

drivers/block/rbd.c

+7 −30
Original line number Diff line number Diff line
@@ -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)

{

	int ret;



	/* 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;

	return rbd_dev_v1_header_read(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)

		goto out_err;



	dout("discovered version 2 image, header name is %s\n",

		rbd_dev->header_name);



	return 0;

out_err:

	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;



	ret = rbd_dev_probe_parent(rbd_dev);

	if (!ret)

		return 0;

	if (ret)

		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:

	rbd_dev_unprobe(rbd_dev);

err_out_watch: