[SMB3] Add parsing for new mount option controlling persistent handles

"nopersistenthandles" and "persistenthandles" mount options added.
The former will not request persistent handles on open even when
SMB3 negotiated and Continuous Availability share.  The latter
will request persistent handles (as long as server notes the
capability in protocol negotiation) even if share is not Continuous
Availability share.

Signed-off-by: Steve French <steve.french@primarydata.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b406a32deb1f6bf2f9e8d416bc019a71f589d8db..1849e29099d01c4e2e6b235243f6a723dbd7c6fa 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -493,7 +493,9 @@ struct smb_vol {
        bool mfsymlinks:1; /* use Minshall+French Symlinks */
        bool multiuser:1;
        bool rwpidforward:1; /* pid forward for read/write operations */
-       bool nosharesock;
+       bool nosharesock:1;
+       bool persistent:1;
+       bool nopersistent:1;
        unsigned int rsize;
        unsigned int wsize;
        bool sockopt_tcp_nodelay:1;

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 773f4dc776305284f4df53e4d4e44741a74b467f..9a9a543ddf4e310d1472906e31839dd9c9040290 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -87,6 +87,7 @@ enum {
        Opt_sign, Opt_seal, Opt_noac,
        Opt_fsc, Opt_mfsymlinks,
        Opt_multiuser, Opt_sloppy, Opt_nosharesock,
+       Opt_persistent, Opt_nopersistent,
 
        /* Mount options which take numeric value */
        Opt_backupuid, Opt_backupgid, Opt_uid,
@@ -169,6 +170,8 @@ static const match_table_t cifs_mount_option_tokens = {
        { Opt_multiuser, "multiuser" },
        { Opt_sloppy, "sloppy" },
        { Opt_nosharesock, "nosharesock" },
+       { Opt_persistent, "persistenthandles"},
+       { Opt_nopersistent, "nopersistenthandles"},
 
        { Opt_backupuid, "backupuid=%s" },
        { Opt_backupgid, "backupgid=%s" },
@@ -1497,6 +1500,22 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
                case Opt_nosharesock:
                        vol->nosharesock = true;
                        break;
+               case Opt_nopersistent:
+                       vol->nopersistent = true;
+                       if (vol->persistent) {
+                               cifs_dbg(VFS,
+                                 "persistenthandles mount options conflict\n");
+                               goto cifs_parse_mount_err;
+                       }
+                       break;
+               case Opt_persistent:
+                       vol->persistent = true;
+                       if (vol->nopersistent) {
+                               cifs_dbg(VFS,
+                                 "persistenthandles mount options conflict\n");
+                               goto cifs_parse_mount_err;
+                       }
+                       break;
 
                /* Numeric Values */
                case Opt_backupuid: