cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath.
While debugging another issue today, Steve and I noticed that if a subdir for a file share is already mounted on the client, any new mount of any other subdir (or the file share root) of the same share results in sharing the cifs superblock, which e.g. can result in incorrect device name. While setting prefix path for the root of a cifs_sb, CIFS_MOUNT_USE_PREFIX_PATH flag should also be set. Without it, prepath is not even considered in some places, and output of "mount" and various /proc/<>/*mount* related options can be missing part of the device name. Signed-off-by:Shyam Prasad N <sprasad@microsoft.com> Reviewed-by:
Aurelien Aptel <aaptel@suse.com> Signed-off-by:
Steve French <stfrench@microsoft.com>
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