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-rw-r--r--xlators/mgmt/glusterd/src/glusterd-volgen.c132
1 files changed, 131 insertions, 1 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index 9012003c9..783958279 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -28,6 +28,8 @@
#include "logging.h"
#include "dict.h"
#include "graph-utils.h"
+#include "glusterd-store.h"
+#include "glusterd-hooks.h"
#include "trie.h"
#include "glusterd-mem-types.h"
#include "cli1-xdr.h"
@@ -1648,7 +1650,8 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
}
/* Check for read-only volume option, and add it to the graph */
- if (dict_get_str_boolean (set_dict, "features.read-only", 0)) {
+ if (dict_get_str_boolean (set_dict, "features.read-only", 0)
+ || volinfo -> is_snap_volume) {
xl = volgen_graph_add (graph, "features/read-only", volname);
if (!xl) {
ret = -1;
@@ -3553,6 +3556,8 @@ generate_client_volfiles (glusterd_volinfo_t *volinfo,
out:
if (dict)
dict_unref (dict);
+
+ gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
return ret;
}
@@ -4182,3 +4187,128 @@ gd_is_boolean_option (char *key)
return _gf_false;
}
+
+/* This function will restore origin volume to it's snap.
+ * The restore operation will simply replace the Gluster origin
+ * volume with the snap volume.
+ * TODO: Multi-volume delete to be done.
+ * Cleanup in case of restore failure is pending.
+ *
+ * @param orig_vol volinfo of origin volume
+ * @param snap_vol volinfo of snapshot volume
+ *
+ * @return 0 on success and negative value on error
+ */
+int
+gd_restore_snap_volume (dict_t *rsp_dict,
+ glusterd_volinfo_t *orig_vol,
+ glusterd_volinfo_t *snap_vol)
+{
+ int ret = -1;
+ glusterd_volinfo_t *new_volinfo = NULL;
+ glusterd_snap_t *snap = NULL;
+ xlator_t *this = NULL;
+ glusterd_conf_t *conf = NULL;
+ glusterd_volinfo_t *temp_volinfo = NULL;
+ glusterd_volinfo_t *voliter = NULL;
+
+ this = THIS;
+ GF_ASSERT (this);
+ GF_ASSERT (rsp_dict);
+ conf = this->private;
+ GF_ASSERT (conf);
+
+ GF_VALIDATE_OR_GOTO (this->name, orig_vol, out);
+ GF_VALIDATE_OR_GOTO (this->name, snap_vol, out);
+ snap = snap_vol->snapshot;
+ GF_VALIDATE_OR_GOTO (this->name, snap, out);
+
+ /* Snap volume must be stoped before performing the
+ * restore operation.
+ */
+ ret = glusterd_stop_volume (snap_vol);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR, "Failed to stop "
+ "snap volume(%s)", snap_vol->volname);
+ goto out;
+ }
+
+ /* Create a new volinfo for the restored volume */
+ ret = glusterd_volinfo_dup (snap_vol, &new_volinfo, _gf_true);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR, "Failed to create volinfo");
+ goto out;
+ }
+
+ /* Following entries need to be derived from origin volume. */
+ strcpy (new_volinfo->volname, orig_vol->volname);
+ uuid_copy (new_volinfo->volume_id, orig_vol->volume_id);
+ new_volinfo->snap_count = orig_vol->snap_count;
+ new_volinfo->snap_max_hard_limit = orig_vol->snap_max_hard_limit;
+ new_volinfo->is_volume_restored = _gf_true;
+
+ /* Bump the version of the restored volume, so that nodes *
+ * which are done can sync during handshake */
+ new_volinfo->version = orig_vol->version;
+
+ list_for_each_entry_safe (voliter, temp_volinfo,
+ &orig_vol->snap_volumes, snapvol_list) {
+ list_add_tail (&voliter->snapvol_list,
+ &new_volinfo->snap_volumes);
+ }
+ /* Copy the snap vol info to the new_volinfo.*/
+ ret = glusterd_snap_volinfo_restore (rsp_dict, new_volinfo, snap_vol);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR, "Failed to restore snap");
+ (void)glusterd_volinfo_delete (new_volinfo);
+ goto out;
+ }
+
+ /* If the orig_vol is already restored then we should delete
+ * the backend LVMs */
+ if (orig_vol->is_volume_restored) {
+ ret = glusterd_lvm_snapshot_remove (rsp_dict, orig_vol);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR, "Failed to remove "
+ "LVM backend");
+ (void)glusterd_volinfo_delete (new_volinfo);
+ goto out;
+ }
+ }
+
+ /* Once the new_volinfo is completely constructed then delete
+ * the orinal volinfo
+ */
+ ret = glusterd_volinfo_delete (orig_vol);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR, "Failed to delete volinfo");
+ (void)glusterd_volinfo_delete (new_volinfo);
+ goto out;
+ }
+ /* New volinfo always shows the status as created. Therefore
+ * set the status to stop. */
+ glusterd_set_volume_status (new_volinfo, GLUSTERD_STATUS_STOPPED);
+
+ list_add_tail (&new_volinfo->vol_list, &conf->volumes);
+
+ /* Now delete the snap entry. As a first step delete the snap
+ * volume information stored in store. */
+ ret = glusterd_snap_remove (rsp_dict, snap, _gf_false, _gf_true);
+ if (ret) {
+ gf_log (this->name, GF_LOG_WARNING, "Failed to delete "
+ "snap %s", snap->snapname);
+ goto out;
+ }
+
+ ret = glusterd_store_volinfo (new_volinfo,
+ GLUSTERD_VOLINFO_VER_AC_INCREMENT);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR, "Failed to store volinfo");
+ goto out;
+ }
+
+ ret = 0;
+out:
+
+ return ret;
+}