mgmt/glusterd: check the availability of fuse for few glusterd operations

Change-Id: I410cc6a86c32637566e5498f69f46cb40322e7fb
BUG: 2715
Reviewed-on: http://review.gluster.com/364
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

5 files changed, 76 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-geo-rep.c b/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
index 86681146bb2..6dca708f7d1 100644
--- a/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
+++ b/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
@@ -942,6 +942,7 @@ glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
         gf_boolean_t            exists   = _gf_false;
         glusterd_volinfo_t      *volinfo = NULL;
         char                    errmsg[PATH_MAX] = {0,};
+        dict_t                  *ctx = NULL;
 
 
         ret = dict_get_int32 (dict, "type", &type);
@@ -981,7 +982,24 @@ glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
         case GF_GSYNC_OPTION_TYPE_START:
                 ret = glusterd_op_verify_gsync_start_options (volinfo, slave,
                                                               op_errstr);
+                if (ret)
+                        goto out;
+                ctx = glusterd_op_get_ctx();
+                if (ctx) {
+                        /*gsyncd does a fuse mount to start the geo-rep session*/
+                        if (!glusterd_is_fuse_available ()) {
+                                gf_log ("glusterd", GF_LOG_ERROR, "Unable to open"
+                                        " /dev/fuse (%s), geo-replication start"
+                                        " failed", strerror (errno));
+                                snprintf (errmsg, sizeof(errmsg),
+                                          "fuse unvailable");
+                                *op_errstr = gf_strdup (errmsg);
+                                ret = -1;
+                                goto out;
+                        }
+                }
                 break;
+
         case GF_GSYNC_OPTION_TYPE_STOP:
                 ret = glusterd_op_verify_gsync_running (volinfo, slave,
                                                         op_errstr);
diff --git a/xlators/mgmt/glusterd/src/glusterd-quota.c b/xlators/mgmt/glusterd/src/glusterd-quota.c
index c81a94501e3..709f8533bc3 100644
--- a/xlators/mgmt/glusterd/src/glusterd-quota.c
+++ b/xlators/mgmt/glusterd/src/glusterd-quota.c
@@ -785,6 +785,8 @@ glusterd_op_stage_quota (dict_t *dict, char **op_errstr)
         int                ret           = 0;
         char              *volname       = NULL;
         gf_boolean_t       exists        = _gf_false;
+        int                type          = 0;
+        dict_t            *ctx           = NULL;
 
         GF_ASSERT (dict);
         GF_ASSERT (op_errstr);
@@ -805,6 +807,29 @@ glusterd_op_stage_quota (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
+        ret = dict_get_int32 (dict, "type", &type);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get 'type' for quota op");
+                *op_errstr = gf_strdup ("Volume quota failed, internal error "
+                                        ", unable to get type of operation");
+                goto out;
+        }
+
+
+        ctx = glusterd_op_get_ctx();
+        if (ctx && (type == GF_QUOTA_OPTION_TYPE_ENABLE
+                    || type == GF_QUOTA_OPTION_TYPE_LIST)) {
+                /* Fuse mount req. only for enable & list-usage options*/
+                if (!glusterd_is_fuse_available ()) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "Unable to open /dev/"
+                                "fuse (%s), quota command failed",
+                                strerror (errno));
+                        *op_errstr = gf_strdup ("Fuse unavailable");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
 out:
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-replace-brick.c b/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
index f84dae17484..060d40bed9e 100644
--- a/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
+++ b/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
@@ -237,6 +237,7 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
         glusterd_peerinfo_t                     *peerinfo = NULL;
         glusterd_brickinfo_t                    *dst_brickinfo = NULL;
         gf_boolean_t                            is_run         = _gf_false;
+        dict_t                                  *ctx           = NULL;
 
         ret = dict_get_str (dict, "src-brick", &src_brick);
 
@@ -382,6 +383,20 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                 goto out;
         }
 
+        ctx = glusterd_op_get_ctx();
+        if (ctx) {
+                if (!glusterd_is_fuse_available ()) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "Unable to open /dev/"
+                                "fuse (%s), replace-brick command failed",
+                                strerror (errno));
+                        snprintf (msg, sizeof(msg), "Fuse unavailable\n "
+                                "Replace-brick failed");
+                        *op_errstr = gf_strdup (msg);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
         if (!glusterd_is_local_addr (src_brickinfo->hostname)) {
                 gf_log ("", GF_LOG_DEBUG,
                         "I AM THE SOURCE HOST");
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 3aafd6e9ab7..8694f753631 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -94,6 +94,20 @@ glusterd_unset_lock_owner (uuid_t owner)
 }
 
 gf_boolean_t
+glusterd_is_fuse_available ()
+{
+
+        int     fd = 0;
+
+        fd = open ("/dev/fuse", O_RDWR);
+
+        if (fd > -1 && !close (fd))
+                return _gf_true;
+        else
+                return _gf_false;
+}
+
+gf_boolean_t
 glusterd_is_loopback_localhost (const struct sockaddr *sa, char *hostname)
 {
         GF_ASSERT (sa);
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 57e5c82f4d5..2ee36936ade 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -286,4 +286,8 @@ int32_t
 glusterd_add_brick_to_dict (glusterd_volinfo_t *volinfo,
                             glusterd_brickinfo_t *brickinfo,
                             dict_t  *dict, int32_t count);
+
+gf_boolean_t
+glusterd_is_fuse_available ();
+
 #endif