This patch adds more error message in bch_cached_dev_run() to indicate the exact reason why an error value is returned. Please notice when printing out the "is running already" message, pr_info() is used here, because in this case also -EBUSY is returned, the bcache device can continue to attach to the cache devince and run, so it won't be an error level message in kernel message.
Signed-off-by: Coly Li <[email protected]> --- drivers/md/bcache/super.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 4a6406b53de1..026e2df358c3 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -926,13 +926,18 @@ int bch_cached_dev_run(struct cached_dev *dc) NULL, }; - if (dc->io_disable) + if (dc->io_disable) { + pr_err("I/O disabled on cached dev %s", + dc->backing_dev_name); return -EIO; + } if (atomic_xchg(&dc->running, 1)) { kfree(env[1]); kfree(env[2]); kfree(buf); + pr_info("cached dev %s is running already", + dc->backing_dev_name); return -EBUSY; } @@ -961,7 +966,7 @@ int bch_cached_dev_run(struct cached_dev *dc) if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") || sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache")) { - pr_debug("error creating sysfs link"); + pr_err("Couldn't create bcache dev <-> disk sysfs symlinks"); return -ENOMEM; } -- 2.16.4
