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smb3: do not try to cache root directory if dir leases not supported 

To servers which do not support directory leases (e.g. Samba)
it is wasteful to try to open_shroot (ie attempt to cache the
root directory handle).  Skip attempt to open_shroot when
server does not indicate support for directory leases.

Cuts the number of requests on mount from 17 to 15, and
cuts the number of requests on stat of the root directory
from 4 to 3.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org> # v5.1+
This commit is contained in:
Steve French 2020-10-21 00:15:42 -05:00
parent 3c3317daef
commit 3c6e65e679
1 changed files with 4 additions and 1 deletions
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5
fs/cifs/connect.c
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@ -3608,7 +3608,10 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
*/
tcon->retry = volume_info->retry;
tcon->nocase = volume_info->nocase;
tcon->nohandlecache = volume_info->nohandlecache;
if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
tcon->nohandlecache = volume_info->nohandlecache;
else
tcon->nohandlecache = 1;
tcon->nodelete = volume_info->nodelete;
tcon->local_lease = volume_info->local_lease;
INIT_LIST_HEAD(&tcon->pending_opens);