From: Tang Junhui <[email protected]> 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 <[email protected]> --- drivers/md/bcache/sysfs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index b418409..9c8fdd5 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -195,7 +195,7 @@ { 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 @@ if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) return -EINVAL; + v = -ENOENT; list_for_each_entry(c, &bch_cache_sets, list) { v = bch_cached_dev_attach(dc, c); if (!v) @@ -277,7 +278,7 @@ } pr_err("Can't attach %s: cache set not found", buf); - size = v; + return v; } if (attr == &sysfs_detach && dc->disk.c) -- 1.8.3.1
