glusterfs/SOURCES/0256-features-snapview-server-use-the-same-volfile-server.patch

From f90df1167bc70c634ba33c181232321da6770709 Mon Sep 17 00:00:00 2001
From: Raghavendra Bhat <raghavendra@redhat.com>
Date: Tue, 25 Jun 2019 10:51:33 -0400
Subject: [PATCH 256/261] features/snapview-server: use the same volfile server
 for gfapi options

snapview server xlator makes use of "localhost" as the volfile server while
initing the new glfs instance to talk to a snapshot. While localhost is fine,
better use the same volfile server that was used to start the snapshot
daemon containing the snapview-server xlator.

Upstream Patch:
>Change-Id: I4485d39b0e3d066f481adc6958ace53ea33237f7
>fixes: bz#1725211
>Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
> patch: https://review.gluster.org/#/c/glusterfs/+/22974/

BUG: 1722757
Change-Id: I4485d39b0e3d066f481adc6958ace53ea33237f7
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/175984
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 .../snapview-server/src/snapview-server-helpers.c  | 44 ++++++++++++++++++++--
 .../snapview-server/src/snapview-server-messages.h |  2 +-
 2 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/xlators/features/snapview-server/src/snapview-server-helpers.c b/xlators/features/snapview-server/src/snapview-server-helpers.c
index 5514a54..62c1dda 100644
--- a/xlators/features/snapview-server/src/snapview-server-helpers.c
+++ b/xlators/features/snapview-server/src/snapview-server-helpers.c
@@ -476,6 +476,7 @@ __svs_initialise_snapshot_volume(xlator_t *this, const char *name,
     char logfile[PATH_MAX] = {
         0,
     };
+    char *volfile_server = NULL;
 
     GF_VALIDATE_OR_GOTO("snapview-server", this, out);
     GF_VALIDATE_OR_GOTO(this->name, this->private, out);
@@ -512,14 +513,50 @@ __svs_initialise_snapshot_volume(xlator_t *this, const char *name,
         goto out;
     }
 
-    ret = glfs_set_volfile_server(fs, "tcp", "localhost", 24007);
+    /*
+     * Before, localhost was used as the volfile server. But, with that
+     * method, accessing snapshots started giving ENOENT error if a
+     * specific bind address is mentioned in the glusterd volume file.
+     * Check the bug https://bugzilla.redhat.com/show_bug.cgi?id=1725211.
+     * So, the new method is tried below, where, snapview-server first
+     * uses the volfile server used by the snapd (obtained from the
+     * command line arguments saved in the global context of the process).
+     * If the volfile server in global context is NULL, then localhost
+     * is tried (like before).
+     */
+    if (this->ctx->cmd_args.volfile_server) {
+        volfile_server = gf_strdup(this->ctx->cmd_args.volfile_server);
+        if (!volfile_server) {
+            gf_msg(this->name, GF_LOG_WARNING, ENOMEM,
+                   SVS_MSG_VOLFILE_SERVER_GET_FAIL,
+                   "failed to copy volfile server %s. ",
+                   this->ctx->cmd_args.volfile_server);
+            ret = -1;
+            goto out;
+        }
+    } else {
+        gf_msg(this->name, GF_LOG_WARNING, ENOMEM,
+               SVS_MSG_VOLFILE_SERVER_GET_FAIL,
+               "volfile server is NULL in cmd args. "
+               "Trying with localhost");
+        volfile_server = gf_strdup("localhost");
+        if (!volfile_server) {
+            gf_msg(this->name, GF_LOG_WARNING, ENOMEM,
+                   SVS_MSG_VOLFILE_SERVER_GET_FAIL,
+                   "failed to copy volfile server localhost.");
+            ret = -1;
+            goto out;
+        }
+    }
+
+    ret = glfs_set_volfile_server(fs, "tcp", volfile_server, 24007);
     if (ret) {
         gf_msg(this->name, GF_LOG_ERROR, local_errno,
                SVS_MSG_SET_VOLFILE_SERVR_FAILED,
                "setting the "
-               "volfile server for snap volume %s "
+               "volfile server %s for snap volume %s "
                "failed",
-               dirent->name);
+               volfile_server, dirent->name);
         goto out;
     }
 
@@ -561,6 +598,7 @@ out:
         dirent->fs = fs;
     }
 
+    GF_FREE(volfile_server);
     return fs;
 }
 
diff --git a/xlators/features/snapview-server/src/snapview-server-messages.h b/xlators/features/snapview-server/src/snapview-server-messages.h
index 8548015..f634ab5 100644
--- a/xlators/features/snapview-server/src/snapview-server-messages.h
+++ b/xlators/features/snapview-server/src/snapview-server-messages.h
@@ -49,6 +49,6 @@ GLFS_MSGID(SNAPVIEW_SERVER, SVS_MSG_NO_MEMORY, SVS_MSG_MEM_ACNT_FAILED,
            SVS_MSG_CLOSEDIR_FAILED, SVS_MSG_CLOSE_FAILED,
            SVS_MSG_GFID_GEN_FAILED, SVS_MSG_GLFS_NEW_FAILED,
            SVS_MSG_SET_VOLFILE_SERVR_FAILED, SVS_MSG_SET_LOGGING_FAILED,
-           SVS_MSG_GLFS_INIT_FAILED);
+           SVS_MSG_VOLFILE_SERVER_GET_FAIL, SVS_MSG_GLFS_INIT_FAILED);
 
 #endif /* !_SNAPVIEW_CLIENT_MESSAGES_H_ */
-- 
1.8.3.1