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bcache: return attach error when no cache set exist

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[ Upstream commit 7f4fc93d47 ]

I attach a back-end device to a cache set, and the cache set is not
registered yet, this back-end device did not attach successfully, and no
error returned:
[root]# echo 87859280-fec6-4bcc-20df7ca8f86b > /sys/block/sde/bcache/attach
[root]#

In sysfs_attach(), the return value "v" is initialized to "size" in
the beginning, and if no cache set exist in bch_cache_sets, the "v" value
would not change any more, and return to sysfs, sysfs regard it as success
since the "size" is a positive number.

This patch fixes this issue by assigning "v" with "-ENOENT" in the
initialization.

Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tang Junhui 2018-02-07 11:41:45 -08:00 committed by Greg Kroah-Hartman
parent 4c8e0270dc
commit c4c9fd5589
1 changed files with 3 additions and 2 deletions
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5
drivers/md/bcache/sysfs.c
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@ -193,7 +193,7 @@ STORE(__cached_dev)
{
struct cached_dev *dc = container_of(kobj, struct cached_dev,
disk.kobj);
ssize_t v = size;
ssize_t v;
struct cache_set *c;
struct kobj_uevent_env *env;
@ -270,6 +270,7 @@ STORE(__cached_dev)
if (bch_parse_uuid(buf, set_uuid) < 16)
return -EINVAL;
v = -ENOENT;
list_for_each_entry(c, &bch_cache_sets, list) {
v = bch_cached_dev_attach(dc, c, set_uuid);
if (!v)
@ -277,7 +278,7 @@ STORE(__cached_dev)
}
pr_err("Can't attach %s: cache set not found", buf);
size = v;
return v;
}
if (attr == &sysfs_detach && dc->disk.c)