cifs: improve symlink handling for smb2+
When creating inode for symlink, the client used to send below
requests to fill it in:
* create+query_info+close (STATUS_STOPPED_ON_SYMLINK)
* create(+reparse_flag)+query_info+close (set file attrs)
* create+ioctl(get_reparse)+close (query reparse tag)
and then for every access to the symlink dentry, the ->link() method
would send another:
* create+ioctl(get_reparse)+close (parse symlink)
So, in order to improve:
(i) Get rid of unnecessary roundtrips and then resolve symlinks as
follows:
* create+query_info+close (STATUS_STOPPED_ON_SYMLINK +
parse symlink + get reparse tag)
* create(+reparse_flag)+query_info+close (set file attrs)
(ii) Set the resolved symlink target directly in inode->i_link and
use simple_get_link() for ->link() to simply return it.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
14 files changed
