Goldwyn Rodrigues wrote:

On 07/30/2015 03:49 AM, Guoqing Jiang wrote:

quoted

Modifying an exiting device's superblock or creating a new superblock
on an existing device needs to be checked because the device could be
in use by another node in another array. So, we check this by taking
all superblock locks in userspace so that we don't  step onto an active
device used by another node and safeguard against accidental edits.
After the edit is complete, we release all locks and the lockspace so
that it can be used by the kernel space.

Signed-off-by: Goldwyn Rodrigues <redacted>
Signed-off-by: Guoqing Jiang <redacted>
---
V2 Changes: use run-time check for dlm library

This may be better done using a structure of function pointers which
is setup and resolved one-time as opposed to performing symbol
resolution every time the function is called. You could include
get_cluster_name as well in it.

Good point, I will send another incremental patch for this.

Thanks,
Guoqing