protocol/server: do not do root-squashing for trusted clients

* As of now clients mounting within the storage pool using that machine's
  ip/hostname are trusted clients (i.e clients local to the glusterd).

* Be careful when the request itself comes in as nfsnobody (ex: posix tests).
  So move the squashing part to protocol/server when it creates a new frame
  for the request, instead of auth part of rpc layer.

* For nfs servers do root-squashing without checking if it is trusted client,
  as all the nfs servers would be running within the storage pool, hence will
  be trusted clients for the bricks.

* Provide one more option for mounting which actually says root-squash
  should/should not happen. This value is given priority only for the trusted
  clients. For non trusted clients, the volume option takes the priority. But
  for trusted clients if root-squash should not happen, then they have to be
  mounted with root-squash=no option. (This is done because by default
  blocking root-squashing for the trusted clients will cause problems for smb
  and UFO clients for which the requests have to be squashed if the option is
  enabled).

* For geo-replication and defrag clients do not do root-squashing.

* Introduce a new option in open-behind for doing read after successful open.

Change-Id: I8a8359840313dffc34824f3ea80a9c48375067f0
BUG: 954057
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/4863
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/xlators/mount/fuse/utils/mount.glusterfs.in b/xlators/mount/fuse/utils/mount.glusterfs.in
index ff6b524605a..d22f6a69b1e 100755
--- a/xlators/mount/fuse/utils/mount.glusterfs.in
+++ b/xlators/mount/fuse/utils/mount.glusterfs.in
@@ -171,7 +171,11 @@ start_glusterfs ()
         cmd_line=$(echo "$cmd_line --aux-gfid-mount");
     fi
 
-    # options with values start here
+    if [ -n "$no_root_squash" ]; then
+        cmd_line=$(echo "$cmd_line --no-root-squash");
+    fi
+
+#options with values start here
     if [ -n "$log_level" ]; then
         cmd_line=$(echo "$cmd_line --log-level=$log_level");
     fi
@@ -442,6 +446,13 @@ with_options()
         "use-readdirp")
             use_readdirp=$value
             ;;
+        "root-squash")
+            if [ $value == "no" ] ||
+                [ $value == "off" ] ||
+                [ $value == "disable" ] ||
+                [ $value == "false" ] ; then
+                no_root_squash=1;
+            fi ;;
         *)
             echo "Invalid option: $key"
             exit 0