2 files changed, 8 insertions, 0 deletions

diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 8ad2330ba061..877c85409f1f 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -30,6 +30,7 @@
 #define CIFS_MOUNT_CIFS_ACL     0x200 /* send ACL requests to non-POSIX srv   */
 #define CIFS_MOUNT_OVERR_UID    0x400 /* override uid returned from server    */
 #define CIFS_MOUNT_OVERR_GID    0x800 /* override gid returned from server    */
+#define CIFS_MOUNT_DYNPERM      0x1000 /* allow in-memory only mode setting */
 
 struct cifs_sb_info {
         struct cifsTconInfo *tcon;      /* primary mount */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index f428bf3bf1a9..8e2fa6d46c72 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -75,6 +75,7 @@ struct smb_vol {
         bool setuids:1;
         bool override_uid:1;
         bool override_gid:1;
+        bool dynperm:1;
         bool noperm:1;
         bool no_psx_acl:1; /* set if posix acl support should be disabled */
         bool cifs_acl:1;
@@ -1246,6 +1247,10 @@ cifs_parse_mount_options(char *options, const char *devname,
                         vol->setuids = 1;
                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
                         vol->setuids = 0;
+                } else if (strnicmp(data, "dynperm", 7) == 0) {
+                        vol->dynperm = true;
+                } else if (strnicmp(data, "nodynperm", 9) == 0) {
+                        vol->dynperm = false;
                 } else if (strnicmp(data, "nohard", 6) == 0) {
                         vol->retry = 0;
                 } else if (strnicmp(data, "nosoft", 6) == 0) {
@@ -2125,6 +2130,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
                 if (volume_info.override_gid)
                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
+                if (volume_info.dynperm)
+                        cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
                 if (volume_info.direct_io) {
                         cFYI(1, ("mounting share using direct i/o"));
                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;