From 30d60ba2f258da24b91edb880338c7178f901de9 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 6 May 2013 09:51:30 -0500 Subject: [PATCH] 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: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 37 +++++++------------------------------ 1 file changed, 7 insertions(+), 30 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index e4586f2e04c2..ae223819bbf0 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -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: -- 2.20.1