geo-rep: filter out xtime attribute during getxattr

georep gsyncd's xtime needs to filtered irrespective
of any process access.

This way, we can avoid (unnecessarily)syncing xtime attribute
to slave, which may raise permission denied errors.

test case modified to check for xtime xattr only in backend.

Back port of>
>BUG: 1353952
>Signed-off-by: Saravanakumar Arumugam <sarumuga@redhat.com>
>Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>
>Reviewed-on: https://review.gluster.org/14880
>Smoke: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Kotresh HR <khiremat@redhat.com>
>Tested-by: Kotresh HR <khiremat@redhat.com>
>NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
>CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

Change-Id: I2390b703048d5cc747d91fa2ae884dc55de58669
BUG: 1441576
Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>
Reviewed-on: https://review.gluster.org/17046
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra Talur <rtalur@redhat.com>

3 files changed, 61 insertions, 8 deletions

diff --git a/xlators/storage/posix/src/posix-helpers.c b/xlators/storage/posix/src/posix-helpers.c
index cc862c259ca..eef1546cc69 100644
--- a/xlators/storage/posix/src/posix-helpers.c
+++ b/xlators/storage/posix/src/posix-helpers.c
@@ -96,6 +96,57 @@ out:
         return flag;
 }
 
+int
+posix_handle_georep_xattrs (call_frame_t *frame, const char *name,
+                            int *op_errno, gf_boolean_t is_getxattr)
+{
+
+        int                i                = 0;
+        int                ret              = 0;
+        int                pid              = 1;
+        gf_boolean_t       filter_xattr     = _gf_true;
+        static const char *georep_xattr[]   = { "*.glusterfs.*.stime",
+                                                "*.glusterfs.*.xtime",
+                                                "*.glusterfs.*.entry_stime",
+                                                NULL
+                                              };
+        if (frame && frame->root) {
+                pid = frame->root->pid;
+        }
+
+        if (!name) {
+                /* No need to do anything here */
+                ret = 0;
+                goto out;
+        }
+
+        if (pid == GF_CLIENT_PID_GSYNCD && is_getxattr) {
+                filter_xattr = _gf_false;
+
+                /* getxattr from gsyncd process should return all the
+                 * internal xattr. In other cases ignore such xattrs
+                 */
+        }
+
+        for (i = 0; filter_xattr && georep_xattr[i]; i++) {
+                if (fnmatch (georep_xattr[i] , name, FNM_PERIOD) == 0) {
+                        ret = -1;
+                        if (op_errno)
+                               *op_errno = ENOATTR;
+
+                        gf_msg_debug ("posix", ENOATTR,
+                                      "Ignoring the key %s as an internal "
+                                      "xattrs.", name);
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+
 static gf_boolean_t
 _is_in_array (char **str_array, char *str)
 {
@@ -720,7 +771,7 @@ _handle_list_xattr (dict_t *xattr_req, const char *real_path, int fdnum,
                 if (posix_special_xattr (marker_xattrs, key))
                         goto next;
 
-                if (!fnmatch (GF_XATTR_STIME_PATTERN, key, 0))
+                if (posix_handle_georep_xattrs (NULL, key, NULL, _gf_false))
                         goto next;
 
                 if (dict_get (filler->xattr, key))
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index e8aeced59f9..f53207fc5a8 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -4396,11 +4396,10 @@ posix_getxattr (call_frame_t *frame, xlator_t *this,
         op_ret = -1;
         priv = this->private;
 
-        /* Allow access to stime xattr only to geo-rep worker */
-        if (frame->root->pid != GF_CLIENT_PID_GSYNCD && name &&
-            fnmatch ("*.glusterfs.*.stime", name, FNM_PERIOD) == 0) {
+        ret = posix_handle_georep_xattrs (frame, name, &op_errno, _gf_true);
+        if (ret == -1) {
                 op_ret = -1;
-                op_errno = ENOATTR;
+                /* errno should be set from the above function*/
                 goto out;
         }
 
@@ -4713,8 +4712,10 @@ posix_getxattr (call_frame_t *frame, xlator_t *this,
         list_offset = 0;
         while (remaining_size > 0) {
                 strncpy (keybuffer, list + list_offset, sizeof(keybuffer));
-                if (frame->root->pid != GF_CLIENT_PID_GSYNCD &&
-                    fnmatch ("*.glusterfs.*.stime", keybuffer, FNM_PERIOD) == 0)
+
+                ret = posix_handle_georep_xattrs (frame, keybuffer, NULL,
+                                                  _gf_false);
+                if (ret == -1)
                         goto ignore;
 
                 size = sys_lgetxattr (real_path, keybuffer, NULL, 0);
diff --git a/xlators/storage/posix/src/posix.h b/xlators/storage/posix/src/posix.h
index 4e43b1f2d32..febd4326aa1 100644
--- a/xlators/storage/posix/src/posix.h
+++ b/xlators/storage/posix/src/posix.h
@@ -275,7 +275,8 @@ int
 posix_get_ancestry (xlator_t *this, inode_t *leaf_inode,
                     gf_dirent_t *head, char **path, int type, int32_t *op_errno,
                     dict_t *xdata);
-
+int
+posix_handle_georep_xattrs (call_frame_t *, const char *, int *, gf_boolean_t);
 void
 posix_gfid_unset (xlator_t *this, dict_t *xdata);