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The pr_err statement in the code for sysfs_attatch section would run
for various error codes, which maybe confusing.
E.g,
Run the command twice:
echo 796b5c05-b03c-4bc7-9cbd-a8df5e8be891 > \
/sys/block/bcache0/bcache/attach
[the backing dev got attached on the first run]
echo 796b5c05-b03c-4bc7-9cbd-a8df5e8be891 > \
/sys/block/bcache0/bcache/attach
In dmesg, after the command run twice, we can get:
bcache: bch_cached_dev_attach() Can't attach sda6: already attached
bcache: __cached_dev_store() Can't attach 796b5c05-b03c-4bc7-9cbd-\
a8df5e8be891
: cache set not found
The first statement in the message was right, but the second was
confusing.
bch_cached_dev_attach has various pr_ statements for various error
codes, except ENOENT.
After the change, rerun above command twice:
echo 796b5c05-b03c-4bc7-9cbd-a8df5e8be891 > \
/sys/block/bcache0/bcache/attach
echo 796b5c05-b03c-4bc7-9cbd-a8df5e8be891 > \
/sys/block/bcache0/bcache/attach
In dmesg we only got:
bcache: bch_cached_dev_attach() Can't attach sda6: already attached
No confusing "cache set not found" message anymore.
And for some not exist SET-UUID:
echo 796b5c05-b03c-4bc7-9cbd-a8df5e8be898 > \
/sys/block/bcache0/bcache/attach
In dmesg we can get:
bcache: __cached_dev_store() Can't attach 796b5c05-b03c-4bc7-9cbd-\
a8df5e8be898
: cache set not found
Signed-off-by: Shenghui Wang <shhuiw@foxmail.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
e921efeb07