Re: [PATCH] ocfs2: avoid getting dlm lock of the target directory multiple times during reflink process

[Joseph Qi]

Hi Gang,


On 8/26/21 3:59 PM, Gang He wrote:
> During the reflink process, we should acquire the target directory
> inode dlm lock at the beginning, and hold this dlm lock until end
> of the function.
> With this patch, we avoid dlm lock ping-pong effect when clone
> files to the same directory simultaneously from multiple nodes.
> There is a typical user scenario, users regularly back up files
> to a specified directory through the reflink feature from the
> multiple nodes.
> 
Since now it take dir inode lock across the whole reflink, it may impact
other concurrent operations under the same directory.
Have you evaluated such cases?

Thanks,
Joseph