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authorSteve French <stfrench@microsoft.com>2018-04-26 06:19:09 +0300
committerSteve French <stfrench@microsoft.com>2018-05-28 01:56:35 +0300
commit3d4ef9a15343f038ccae17f60468569f23113312 (patch)
tree78a482f5ff0df0a41853800285f0df1a197851c1 /fs/cifs/cifs_fs_sb.h
parentb04e217704b7f879c6b91222b066983a44a7a09f (diff)
downloadlinux-3d4ef9a15343f038ccae17f60468569f23113312.tar.xz
smb3: fix redundant opens on root
In SMB2/SMB3 unlike in cifs we unnecessarily open the root of the share over and over again in various places during mount and path revalidation and also in statfs. This patch cuts redundant traffic (opens and closes) by simply keeping the directory handle for the root around (and reopening it as needed on reconnect), so query calls don't require three round trips to copmlete - just one, and eases load on network, client and server (on mount alone, cuts network traffic by more than a third). Also add a new cifs mount parm "nohandlecache" to allow users whose servers might have resource constraints (eg in case they have a server with so many users connecting to it that this extra handle per mount could possibly be a resource concern). Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Diffstat (limited to 'fs/cifs/cifs_fs_sb.h')
-rw-r--r--fs/cifs/cifs_fs_sb.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 350fa55a1bf7..9731d0d891e7 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -50,6 +50,7 @@
* root mountable
*/
#define CIFS_MOUNT_UID_FROM_ACL 0x2000000 /* try to get UID via special SID */
+#define CIFS_MOUNT_NO_HANDLE_CACHE 0x4000000 /* disable caching dir handles */
struct cifs_sb_info {
struct rb_root tlink_tree;