feature/changelog: Virtual xattr to trigger explicit sync in geo-rep.

A virtual xattr "glusterfs.geo-rep.trigger-sync" is provided
in glusterfs through changelog translator. Geo-rep triggers
a explicit data sync on setting this xattr on a file.
Changelog captures a DATA entry on file's gfid on setting this
virtual xattr on a file. This is supported only for files. It
doesn't support directories.

Usage: setfattr -n glusterfs.geo-rep.trigger-sync <file-path>

Change-Id: Ia689326ac2dcb31035ffbecad2c548eda4eb9245
BUG: 1176934
Signed-off-by: Kotresh HR <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/9337
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Venky Shankar <vshankar@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/xlators/features/changelog/src/changelog.c b/xlators/features/changelog/src/changelog.c
index d2e30f7f001..e047288d43d 100644
--- a/xlators/features/changelog/src/changelog.c
+++ b/xlators/features/changelog/src/changelog.c
@@ -1326,6 +1326,17 @@ changelog_setxattr (call_frame_t *frame,
         CHANGELOG_INIT (this, frame->local,
                         loc->inode, loc->inode->gfid, 1);
 
+        /* On setting this virtual xattr on a file, an explicit data
+           sync is triggered from geo-rep as DATA entry is recorded
+           in changelog. */
+        if (dict_get (dict, GF_XATTR_TRIGGER_SYNC)
+            && loc->inode->ia_type != IA_IFDIR) {
+                changelog_update (this, priv, frame->local,
+                                  CHANGELOG_TYPE_DATA);
+                CHANGELOG_STACK_UNWIND (setxattr, frame, 0, 0, xdata);
+                return 0;
+        }
+
         co = changelog_get_usable_buffer (frame->local);
         if (!co)
                 goto wind;