From 53092bbaab60944c19e7477940d3edd140e7e720 Mon Sep 17 00:00:00 2001

From: Atin Mukherjee <amukherj@redhat.com>

Date: Tue, 26 Apr 2016 15:27:43 +0530

Subject: [PATCH 105/139] glusterd: persist brickinfo->real_path

Backport of http://review.gluster.org/14124

            http://review.gluster.org/14075

Since real_path was not persisted and gets constructed at every glusterd

restart, glusterd will fail to come up if one of the brick's underlying file

system is crashed.

Solution is to construct real_path only once and get it persisted.

Change-Id: I97abc30372c1ffbbb2d43b716d7af09172147b47

BUG: 1330385

Signed-off-by: Atin Mukherjee <amukherj@redhat.com>

Reviewed-on: http://review.gluster.org/14075

CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

Smoke: Gluster Build System <jenkins@build.gluster.com>

Reviewed-by: Kaushal M <kaushal@redhat.com>

NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>

Reviewed-on: http://review.gluster.org/14124

Reviewed-by: Jeff Darcy <jdarcy@redhat.com>

Reviewed-on: https://code.engineering.redhat.com/gerrit/73410

---

 xlators/mgmt/glusterd/src/glusterd-store.c |   39 ++++++++++++++++++----------

 xlators/mgmt/glusterd/src/glusterd-store.h |    1 +

 xlators/mgmt/glusterd/src/glusterd-utils.c |   24 +++++++++--------

 3 files changed, 39 insertions(+), 25 deletions(-)

diff --git a/xlators/mgmt/glusterd/src/glusterd-store.c b/xlators/mgmt/glusterd/src/glusterd-store.c

index 8b76cbf..4408081 100644

--- a/xlators/mgmt/glusterd/src/glusterd-store.c

+++ b/xlators/mgmt/glusterd/src/glusterd-store.c

@@ -383,6 +383,11 @@ glusterd_store_brickinfo_write (int fd, glusterd_brickinfo_t *brickinfo)

         if (ret)

                 goto out;

+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_REAL_PATH,

+                                   brickinfo->path);

+        if (ret)

+                goto out;

+

         snprintf (value, sizeof(value), "%d", brickinfo->port);

         ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_PORT, value);

@@ -2314,6 +2319,10 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)

                                     strlen (GLUSTERD_STORE_KEY_BRICK_PATH))) {

                                 strncpy (brickinfo->path, value,

                                          sizeof (brickinfo->path));

+                        } else if (!strncmp (key, GLUSTERD_STORE_KEY_BRICK_REAL_PATH,

+                                    strlen (GLUSTERD_STORE_KEY_BRICK_REAL_PATH))) {

+                                strncpy (brickinfo->real_path, value,

+                                         sizeof (brickinfo->real_path));

                         } else if (!strncmp (key, GLUSTERD_STORE_KEY_BRICK_PORT,

                                     strlen (GLUSTERD_STORE_KEY_BRICK_PORT))) {

                                 gf_string2int (value, &brickinfo->port);

@@ -2414,8 +2423,8 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)

                  * snapshot or snapshot restored volume this would be done post

                  * creating the brick mounts

                  */

-                if (!volinfo->is_snap_volume &&

-                    gf_uuid_is_null (volinfo->restored_from_snap)) {

+                if (brickinfo->real_path[0] == '\0' && !volinfo->is_snap_volume

+                    && gf_uuid_is_null (volinfo->restored_from_snap)) {

                         /* By now if the brick is a local brick then it will be

                          * able to resolve which is the only thing we want now

                          * for checking  whether the brickinfo->uuid matches

@@ -3309,19 +3318,21 @@ glusterd_recreate_vol_brick_mounts (xlator_t  *this,

                                 "Failed to mount brick_mount_path");

                 }

                 if (!gf_uuid_compare(brickinfo->uuid, MY_UUID)) {

-                        if (!realpath (brickinfo->path, abspath)) {

-                                gf_msg (this->name, GF_LOG_CRITICAL,

-                                        errno,

-                                        GD_MSG_BRICKINFO_CREATE_FAIL,

-                                        "realpath() failed for brick %s"

-                                        ". The underlying file system "

-                                        "may be in bad state",

-                                        brickinfo->path);

-                                ret = -1;

-                                goto out;

+                        if (brickinfo->real_path[0] == '\0') {

+                                if (!realpath (brickinfo->path, abspath)) {

+                                        gf_msg (this->name, GF_LOG_CRITICAL,

+                                                errno,

+                                                GD_MSG_BRICKINFO_CREATE_FAIL,

+                                                "realpath() failed for brick %s"

+                                                ". The underlying file system "

+                                                "may be in bad state",

+                                                brickinfo->path);

+                                        ret = -1;

+                                        goto out;

+                                }

+                                strncpy (brickinfo->real_path, abspath,

+                                         strlen(abspath));

                         }

-                        strncpy (brickinfo->real_path, abspath,

-                                 strlen(abspath));

                 }

                 if (brick_mount_path) {

diff --git a/xlators/mgmt/glusterd/src/glusterd-store.h b/xlators/mgmt/glusterd/src/glusterd-store.h

index 683edae..93096d9 100644

--- a/xlators/mgmt/glusterd/src/glusterd-store.h

+++ b/xlators/mgmt/glusterd/src/glusterd-store.h

@@ -90,6 +90,7 @@ typedef enum glusterd_store_ver_ac_{

 #define GLUSTERD_STORE_KEY_BRICK_HOSTNAME       "hostname"

 #define GLUSTERD_STORE_KEY_BRICK_PATH           "path"

+#define GLUSTERD_STORE_KEY_BRICK_REAL_PATH      "real_path"

 #define GLUSTERD_STORE_KEY_BRICK_PORT           "listen-port"

 #define GLUSTERD_STORE_KEY_BRICK_RDMA_PORT      "rdma.listen-port"

 #define GLUSTERD_STORE_KEY_BRICK_DECOMMISSIONED "decommissioned"

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c

index d100ec3..1c6541c 100644

--- a/xlators/mgmt/glusterd/src/glusterd-utils.c

+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c

@@ -1113,7 +1113,7 @@ glusterd_brickinfo_new_from_brick (char *brick,

         strncpy (new_brickinfo->hostname, hostname, 1024);

         strncpy (new_brickinfo->path, path, 1024);

-        if (construct_real_path) {

+        if (construct_real_path && new_brickinfo->real_path[0] == '\0') {

                 if (!realpath (new_brickinfo->path, abspath)) {

                         /* ENOENT indicates that brick path has not been created

                          * which is a valid scenario */

@@ -3103,17 +3103,19 @@ glusterd_import_new_brick (dict_t *peer_data, int32_t vol_count,

         gf_uuid_parse (brick_uuid_str, new_brickinfo->uuid);

         if (!gf_uuid_compare(new_brickinfo->uuid, MY_UUID)) {

-                if (!realpath (new_brickinfo->path, abspath)) {

-                        gf_msg (this->name, GF_LOG_CRITICAL, errno,

-                                GD_MSG_BRICKINFO_CREATE_FAIL, "realpath() "

-                                "failed for brick %s. The underlying file "

-                                "system may be in bad state",

-                                new_brickinfo->path);

-                        ret = -1;

-                        goto out;

+                if (new_brickinfo->real_path[0] == '\0') {

+                        if (!realpath (new_brickinfo->path, abspath)) {

+                                gf_msg (this->name, GF_LOG_CRITICAL, errno,

+                                        GD_MSG_BRICKINFO_CREATE_FAIL,

+                                        "realpath() failed for brick %s. The "

+                                        "underlying file system may be in bad "

+                                        "state", new_brickinfo->path);

+                                ret = -1;

+                                goto out;

+                        }

+                        strncpy (new_brickinfo->real_path, abspath,

+                                 strlen(abspath));

                 }

-                strncpy (new_brickinfo->real_path, abspath,

-                         strlen(abspath));

         }

         *brickinfo = new_brickinfo;

-- 

1.7.1