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bcache: return attach error when no cache set exist
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>
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@ -198,7 +198,7 @@ STORE(__cached_dev)
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{
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struct cached_dev *dc = container_of(kobj, struct cached_dev,
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disk.kobj);
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ssize_t v = size;
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ssize_t v;
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struct cache_set *c;
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struct kobj_uevent_env *env;
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@ -275,6 +275,7 @@ STORE(__cached_dev)
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if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16)
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return -EINVAL;
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v = -ENOENT;
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list_for_each_entry(c, &bch_cache_sets, list) {
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v = bch_cached_dev_attach(dc, c);
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if (!v)
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@ -282,7 +283,7 @@ STORE(__cached_dev)
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}
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pr_err("Can't attach %s: cache set not found", buf);
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size = v;
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return v;
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}
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if (attr == &sysfs_detach && dc->disk.c)
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