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| author | Tang Junhui <tang.junhui@zte.com.cn> | 2018-02-07 11:41:45 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:50:26 +0200 |
| commit | d4008f81ccdffd9960e92a8332b19125976174fb (patch) | |
| tree | d57a8ce5022361442776b696a54e80fee665b994 /drivers/md | |
| parent | 0d5da3123946e74d822022f95091fc3fe60f9f61 (diff) | |
bcache: return attach error when no cache set exist
[ Upstream commit 7f4fc93d4713394ee8f1cd44c238e046e11b4f15 ]
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>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/sysfs.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 1efe31615281..5a5c1f1bd8a5 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -191,7 +191,7 @@ 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; @@ -268,6 +268,7 @@ 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) @@ -275,7 +276,7 @@ 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) |