posix: if brick-uid or brick-gid is not specified, do not set

Current code would set owner uid/gid explicitly to 0/0 on start
even if none was specified. Fix it.

Cherry picked from commit 8bdc329:
> Change-Id: I72dec9e79c51bd1eb3af5334c42b7c23b01d0258
> BUG: 1040275
> Signed-off-by: Anand Avati <avati@redhat.com>
> Reviewed-on: http://review.gluster.org/6476
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Tested-by: Lukáš Bezdička <lukas.bezdicka@gooddata.com>
> Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
> Reviewed-by: Vijay Bellur <vbellur@redhat.com>

Change-Id: Ie0396c1a4e6e0979ea9c855d33db963544a75c42
BUG: 1095971
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/7720
Tested-by: Gluster Build System <jenkins@build.gluster.com>

2 files changed, 76 insertions, 12 deletions

diff --git a/tests/bugs/brick-uid-reset-on-volume-restart.t b/tests/bugs/brick-uid-reset-on-volume-restart.t
new file mode 100755
index 00000000000..99629733f9b
--- /dev/null
+++ b/tests/bugs/brick-uid-reset-on-volume-restart.t
@@ -0,0 +1,47 @@
+#!/bin/bash
+
+. $(dirname $0)/../include.rc
+. $(dirname $0)/../volume.rc
+
+function get_uid() {
+    stat -c '%u' $1;
+}
+
+function get_gid() {
+    stat -c '%g' $1;
+}
+
+
+cleanup;
+
+TEST glusterd
+TEST pidof glusterd
+
+TEST $CLI volume create $V0 replica 2 stripe 2 $H0:$B0/${V0}{1,2,3,4,5,6,7,8};
+
+EXPECT "$V0" volinfo_field $V0 'Volume Name';
+EXPECT 'Created' volinfo_field $V0 'Status';
+EXPECT '8' brick_count $V0
+
+TEST $CLI volume start $V0;
+EXPECT 'Started' volinfo_field $V0 'Status';
+
+TEST glusterfs -s $H0 --volfile-id $V0 $M0;
+
+EXPECT 0 get_uid $M0;
+EXPECT 0 get_gid $M0;
+
+TEST chown 100:101 $M0;
+
+EXPECT 100 get_uid $M0;
+EXPECT 101 get_gid $M0;
+
+TEST $CLI volume stop $V0;
+TEST $CLI volume start $V0;
+
+sleep 10;
+
+EXPECT 100 get_uid $M0;
+EXPECT 101 get_gid $M0;
+
+cleanup;
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index f22770eb41a..6a7e691724e 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -5097,9 +5097,22 @@ posix_set_owner (xlator_t *this, uid_t uid, gid_t gid)
 {
         struct posix_private *priv = NULL;
         int                   ret  = -1;
+	struct stat st = {0,};
 
         priv = this->private;
 
+	ret = sys_lstat (priv->base_path, &st);
+	if (ret) {
+		gf_log (this->name, GF_LOG_ERROR, "Failed to stat "
+			"brick path %s (%s)",
+			priv->base_path, strerror (errno));
+		return ret;
+	}
+
+	if ((uid == -1 || st.st_uid == uid) &&
+	    (gid == -1 || st.st_gid == gid))
+		return 0;
+
         ret = sys_chown (priv->base_path, uid, gid);
         if (ret)
                 gf_log (this->name, GF_LOG_ERROR, "Failed to set "
@@ -5135,15 +5148,16 @@ reconfigure (xlator_t *this, dict_t *options)
 {
 	int                   ret = -1;
 	struct posix_private *priv = NULL;
-        uid_t                 uid = -1;
-        gid_t                 gid = -1;
+        int32_t               uid = -1;
+        int32_t               gid = -1;
 	char                 *batch_fsync_mode_str = NULL;
 
 	priv = this->private;
 
-        GF_OPTION_RECONF ("brick-uid", uid, options, uint32, out);
-        GF_OPTION_RECONF ("brick-gid", gid, options, uint32, out);
-        posix_set_owner (this, uid, gid);
+        GF_OPTION_RECONF ("brick-uid", uid, options, int32, out);
+        GF_OPTION_RECONF ("brick-gid", gid, options, int32, out);
+	if (uid != -1 || gid != -1)
+		posix_set_owner (this, uid, gid);
 
 	GF_OPTION_RECONF ("batch-fsync-delay-usec", priv->batch_fsync_delay_usec,
 			  options, uint32, out);
@@ -5209,8 +5223,8 @@ init (xlator_t *this)
         uuid_t                gfid          = {0,};
         uuid_t                rootgfid      = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
         char                 *guuid         = NULL;
-        uid_t                 uid           = -1;
-        gid_t                 gid           = -1;
+        int32_t               uid           = -1;
+        int32_t               gid           = -1;
 	char                 *batch_fsync_mode_str;
 
         dir_data = dict_get (this->options, "directory");
@@ -5545,9 +5559,10 @@ init (xlator_t *this)
 	_private->aio_init_done = _gf_false;
 	_private->aio_capable = _gf_false;
 
-        GF_OPTION_INIT ("brick-uid", uid, uint32, out);
-        GF_OPTION_INIT ("brick-gid", gid, uint32, out);
-        posix_set_owner (this, uid, gid);
+        GF_OPTION_INIT ("brick-uid", uid, int32, out);
+        GF_OPTION_INIT ("brick-gid", gid, int32, out);
+	if (uid != -1 || gid != -1)
+		posix_set_owner (this, uid, gid);
 
 	GF_OPTION_INIT ("linux-aio", _private->aio_configured, bool, out);
 
@@ -5708,15 +5723,17 @@ struct volume_options options[] = {
         {
           .key = {"brick-uid"},
           .type = GF_OPTION_TYPE_INT,
-          .min = 0,
+          .min = -1,
           .validate = GF_OPT_VALIDATE_MIN,
+	  .default_value = "-1",
           .description = "Support for setting uid of brick's owner"
         },
         {
           .key = {"brick-gid"},
           .type = GF_OPTION_TYPE_INT,
-          .min = 0,
+          .min = -1,
           .validate = GF_OPT_VALIDATE_MIN,
+	  .default_value = "-1",
           .description = "Support for setting gid of brick's owner"
         },
         { .key = {"node-uuid-pathinfo"},