vfs_glusterfs: Fix exporting subdirs with shadow_copy2

Since the glusterfs vfs module does not operate on a
locally mounted path, but on a "virtual" path starting
at the volume root, some assumptions of the code about
the vfs connect path fail. One example is the shadow_copy2
module which tries to detect the mount point from the
connectpath. In order to circumvent this problem, this
patch forces the "shadow:mountpoint" option to "/", which
skips the mount-point-detection code.

This patch will only have an effect if both the glusterfs
and the shadow_copy2 module are listed in vfs objects
in the right order, i.e. first shadow_copy2, and then
glusterfs.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13091

Pair-Programmed-With: Anoop C S <anoopcs@redhat.com>

Signed-off-by: Michael Adam <obnox@samba.org>
Signed-off-by: Anoop C S <anoopcs@redhat.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
(cherry picked from commit 1249801ec73c55449068dd72efde81ce6235ec8e)

diff --git a/source3/modules/vfs_glusterfs.c b/source3/modules/vfs_glusterfs.c
index 1c9be2d97f1eb74f2f07adeca5b4f03b41537017..2b6d827d21e26a9afbd4a2e3bf1f47b2f75e2dbf 100644 (file)
--- a/source3/modules/vfs_glusterfs.c
+++ b/source3/modules/vfs_glusterfs.c
@@ -352,6 +352,16 @@ static int vfs_gluster_connect(struct vfs_handle_struct *handle,
                          volume, strerror(errno)));
                goto done;
        }
+
+       /*
+        * The shadow_copy2 module will fail to export subdirectories
+        * of a gluster volume unless we specify the mount point,
+        * because the detection fails if the file system is not
+        * locally mounted:
+        * https://bugzilla.samba.org/show_bug.cgi?id=13091
+        */
+       lp_do_parameter(SNUM(handle->conn), "shadow:mountpoint", "/");
+
 done:
        if (ret < 0) {
                if (fs)