CIFS: Migrate to shared superblock model

Add cifs_match_super to use in sget to share superblock between mounts
that have the same //server/sharename, credentials and mount options.
It helps us to improve performance on work with future SMB2.1 leases.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 68ec457f8476..ca0c3789206e 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -210,6 +210,25 @@ struct smb_vol {
         struct nls_table *local_nls;
 };
 
+#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
+                         CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
+                         CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
+                         CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
+                         CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
+                         CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
+                         CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
+                         CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
+                         CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO)
+
+#define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
+                      MS_NODEV | MS_SYNCHRONOUS)
+
+struct cifs_mnt_data {
+        struct cifs_sb_info *cifs_sb;
+        struct smb_vol *vol;
+        int flags;
+};
+
 struct TCP_Server_Info {
         struct list_head tcp_ses_list;
         struct list_head smb_ses_list;