glusterfs/0316-snapshot-remove-stale-entry.patch

From ed178ad11c75da242d68de5d24d9b0a8faaf9deb Mon Sep 17 00:00:00 2001
From: Sunny Kumar <sunkumar@redhat.com>
Date: Tue, 3 Jul 2018 16:03:35 +0530
Subject: [PATCH 316/325] snapshot : remove stale entry

        During snap delete after removing brick-path we should remove
        snap-path too i.e. /var/run/gluster/snaps/<snap-name>.

        During snap deactivate also we should remove snap-path.

>fixes: bz#1597662
>Signed-off-by: Sunny Kumar <sunkumar@redhat.com>
Upstream Patch : https://review.gluster.org/#/c/20454/
Change-Id: Ib80b5d8844d6479d31beafa732e5671b0322248b
BUG: 1547903

Signed-off-by: Sunny Kumar <sunkumar@redhat.com>
Change-Id: I93827f4e15a37247bafeb077575dc60658b8851f
Reviewed-on: https://code.engineering.redhat.com/gerrit/143814
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
---
 tests/bugs/snapshot/bug-1597662.t             | 57 +++++++++++++++++++++++++++
 xlators/mgmt/glusterd/src/glusterd-snapshot.c | 38 ++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 tests/bugs/snapshot/bug-1597662.t

diff --git a/tests/bugs/snapshot/bug-1597662.t b/tests/bugs/snapshot/bug-1597662.t
new file mode 100644
index 0000000..dc87d17
--- /dev/null
+++ b/tests/bugs/snapshot/bug-1597662.t
@@ -0,0 +1,57 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../snapshot.rc
+
+cleanup;
+
+TEST init_n_bricks 3;
+TEST setup_lvm 3;
+TEST glusterd;
+TEST pidof glusterd;
+
+TEST $CLI volume create $V0 $H0:$L1 $H0:$L2 $H0:$L3;
+TEST $CLI volume start $V0;
+
+snap_path=/var/run/gluster/snaps
+
+TEST $CLI snapshot create snap1 $V0 no-timestamp;
+
+$CLI snapshot activate snap1;
+
+EXPECT 'Started' snapshot_status snap1;
+
+# This Function will check for entry /var/run/gluster/snaps/<snap-name>
+# against snap-name
+
+function is_snap_path
+{
+        echo `ls $snap_path | grep snap1 | wc -l`
+}
+
+# snap is active so snap_path should exist
+EXPECT "1" is_snap_path
+
+$CLI snapshot deactivate snap1;
+
+# snap is deactivated so snap_path should not exist
+EXPECT "0" is_snap_path
+
+# activate snap again
+$CLI snapshot activate snap1;
+
+# snap is active so snap_path should exist
+EXPECT "1" is_snap_path
+
+# delete snap now
+TEST $CLI snapshot delete snap1;
+
+# snap is deleted so snap_path should not exist
+EXPECT "0" is_snap_path
+
+TEST $CLI volume stop $V0;
+TEST $CLI volume delete $V0;
+
+cleanup;
+
diff --git a/xlators/mgmt/glusterd/src/glusterd-snapshot.c b/xlators/mgmt/glusterd/src/glusterd-snapshot.c
index 84335ef..304cef6 100644
--- a/xlators/mgmt/glusterd/src/glusterd-snapshot.c
+++ b/xlators/mgmt/glusterd/src/glusterd-snapshot.c
@@ -2945,6 +2945,7 @@ glusterd_lvm_snapshot_remove (dict_t *rsp_dict, glusterd_volinfo_t *snap_vol)
         glusterd_brickinfo_t *brickinfo            = NULL;
         xlator_t             *this                 = NULL;
         char                  brick_dir[PATH_MAX]  = "";
+        char                  snap_path[PATH_MAX]  = "";
         char                 *tmp                  = NULL;
         char                 *brick_mount_path     = NULL;
         gf_boolean_t          is_brick_dir_present = _gf_false;
@@ -3116,6 +3117,28 @@ remove_brick_path:
                                         brick_dir, strerror (errno));
                                 goto out;
                 }
+
+                /* After removing brick_dir, fetch and remove snap path
+                 * i.e. /var/run/gluster/snaps/<snap-name>.
+                 */
+                if (!snap_vol->snapshot) {
+                        gf_msg (this->name, GF_LOG_WARNING, EINVAL,
+                                GD_MSG_INVALID_ENTRY, "snapshot not"
+                                "present in snap_vol");
+                        ret = -1;
+                        goto out;
+                }
+
+                snprintf (snap_path, sizeof (snap_path) - 1, "%s/%s",
+                          snap_mount_dir, snap_vol->snapshot->snapname);
+                ret = recursive_rmdir (snap_path);
+                if (ret) {
+                        gf_msg (this->name, GF_LOG_ERROR, errno,
+                                GD_MSG_DIR_OP_FAILED, "Failed to remove "
+                                "%s directory : error : %s", snap_path,
+                                strerror (errno));
+                        goto out;
+                }
         }
 
         ret = 0;
@@ -6260,6 +6283,7 @@ glusterd_snapshot_deactivate_commit (dict_t *dict, char **op_errstr,
         glusterd_snap_t          *snap                 = NULL;
         glusterd_volinfo_t       *snap_volinfo         = NULL;
         xlator_t                 *this                 = NULL;
+        char                      snap_path[PATH_MAX]  =  "";
 
         this = THIS;
         GF_ASSERT (this);
@@ -6318,6 +6342,20 @@ glusterd_snapshot_deactivate_commit (dict_t *dict, char **op_errstr,
                         "Failed to unmounts for %s", snap->snapname);
         }
 
+        /*Remove /var/run/gluster/snaps/<snap-name> entry for deactivated snaps.
+         * This entry will be created again during snap activate.
+         */
+        snprintf (snap_path, sizeof (snap_path) - 1, "%s/%s",
+                  snap_mount_dir, snapname);
+        ret = recursive_rmdir (snap_path);
+        if (ret) {
+                gf_msg (this->name, GF_LOG_ERROR, errno,
+                        GD_MSG_DIR_OP_FAILED, "Failed to remove "
+                        "%s directory : error : %s", snap_path,
+                        strerror (errno));
+                goto out;
+        }
+
         ret = dict_set_dynstr_with_alloc (rsp_dict, "snapuuid",
                                           uuid_utoa (snap->snap_id));
         if (ret) {
-- 
1.8.3.1