feature/geo-rep: Keep marker.tstamp's mtime unchangeable during snapshot.

Problem:

Geo-replicatoin does a full xsync crawl after snapshot
restoration of slave and master. It does not do history crawl.

Analysis:

Marker creates 'marker.tstamp' file when geo-rep is started
for the first time. The virtual extended attribute
'trusted.glusterfs.volume-mark' is maintained and whenever
it is queried on gluster mount point, marker fills it on
the fly and returns the combination of uuid, ctime of
marker.tstamp and others. So ctime of marker.tstamp, in other
sense 'volume-mark'  marks the geo-rep start time when the
session is freshly created.

From the above, after the first filesystem crawl(xsync) is
done during first geo-rep start, stime should always be less
than 'volume-mark'. So whenever stime is less than volume-mark,
it does full filesystem crawl (xsync).

Root Cause:

When snapshot is restored, marker.tstamp file is freshly
created losing the timestamps, it was originally created with.

Solution:

1. Change is made to depend on mtime instead of ctime.
2. mtime and atime of marker.tstamp is restored back when
   snapshot is created and restored.

Change-Id: I4891b112f4aedc50cfae402832c50c5145807d7a
BUG: 1125918
Signed-off-by: Kotresh H R <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/8401
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 54 insertions, 11 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index 9701c6b939c..f1e30e1ee82 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -16,6 +16,7 @@
 #include <fnmatch.h>
 #include <sys/wait.h>
 #include <dlfcn.h>
+#include <utime.h>
 
 #if (HAVE_LIB_XML)
 #include <libxml/encoding.h>
@@ -3824,12 +3825,34 @@ get_vol_tstamp_file (char *filename, glusterd_volinfo_t *volinfo)
                  PATH_MAX - strlen(filename) - 1);
 }
 
+static void
+get_parent_vol_tstamp_file (char *filename, glusterd_volinfo_t *volinfo)
+{
+        glusterd_conf_t *priv  = NULL;
+        xlator_t        *this  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        snprintf (filename, PATH_MAX, "%s/vols/%s", priv->workdir,
+                  volinfo->parent_volname);
+        strncat (filename, "/marker.tstamp",
+                 PATH_MAX - strlen(filename) - 1);
+}
+
 int
 generate_brick_volfiles (glusterd_volinfo_t *volinfo)
 {
-        glusterd_brickinfo_t    *brickinfo = NULL;
-        char                     tstamp_file[PATH_MAX] = {0,};
-        int                      ret = -1;
+        glusterd_brickinfo_t    *brickinfo                    = NULL;
+        char                     tstamp_file[PATH_MAX]        = {0,};
+        char                     parent_tstamp_file[PATH_MAX] = {0,};
+        int                      ret                          = -1;
+        xlator_t                *this                         = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
 
         ret = glusterd_volinfo_get_boolean (volinfo, VKEY_MARKER_XTIME);
         if (ret == -1)
@@ -3840,29 +3863,49 @@ generate_brick_volfiles (glusterd_volinfo_t *volinfo)
         if (ret) {
                 ret = open (tstamp_file, O_WRONLY|O_CREAT|O_EXCL, 0600);
                 if (ret == -1 && errno == EEXIST) {
-                        gf_log ("", GF_LOG_DEBUG, "timestamp file exist");
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "timestamp file exist");
                         ret = -2;
                 }
                 if (ret == -1) {
-                        gf_log ("", GF_LOG_ERROR, "failed to create %s (%s)",
-                                tstamp_file, strerror (errno));
+                        gf_log (this->name, GF_LOG_ERROR, "failed to create "
+                                "%s (%s)", tstamp_file, strerror (errno));
                         return -1;
                 }
-                if (ret >= 0)
+                if (ret >= 0) {
                         close (ret);
+                        /* If snap_volume, retain timestamp for marker.tstamp
+                         * from parent. Geo-replication depends on mtime of
+                         * 'marker.tstamp' to decide the volume-mark, i.e.,
+                         * geo-rep start time just after session is created.
+                         */
+                        if (volinfo->is_snap_volume) {
+                                get_parent_vol_tstamp_file (parent_tstamp_file,
+                                                            volinfo);
+                                ret = gf_set_timestamp (parent_tstamp_file,
+                                                        tstamp_file);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "Unable to set atime and mtime"
+                                                " of %s as of %s", tstamp_file,
+                                                parent_tstamp_file);
+                                        goto out;
+                                }
+                        }
+                }
         } else {
                 ret = unlink (tstamp_file);
                 if (ret == -1 && errno == ENOENT)
                         ret = 0;
                 if (ret == -1) {
-                        gf_log ("", GF_LOG_ERROR, "failed to unlink %s (%s)",
-                                tstamp_file, strerror (errno));
+                        gf_log (this->name, GF_LOG_ERROR, "failed to unlink "
+                                "%s (%s)", tstamp_file, strerror (errno));
                         return -1;
                 }
         }
 
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                gf_log ("", GF_LOG_DEBUG,
+                gf_log (this->name, GF_LOG_DEBUG,
                         "Found a brick - %s:%s", brickinfo->hostname,
                         brickinfo->path);
 
@@ -3875,7 +3918,7 @@ generate_brick_volfiles (glusterd_volinfo_t *volinfo)
         ret = 0;
 
 out:
-        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }