features/cloudsync: Make plugins configurable

This patch brings the configuration option for plugins.

For new plugins, an entry has to be created in to cs_plugin structure e.g.
struct cs_plugin plugins[] = {
        {
          .name = "amazons3",
          .library = "libamazons3.so",
          .description = "amazon s3 store."
        },

        {.name = NULL},
};

Library field describes the name of the shared library for the plugin.

To configure plugin type "feature.cloudsync-storetype" option need
to be set to the remote-store type. e.g.

gluster volume set VOLNAME cloudsync-storetype amazons3. This should be same
as the ".name" field in cs_plugin structure.

cs_init will pick this up in run time to load the plugin.

Change-Id: I2cec10b206f71ac4e71d472631a3a5badf278b59
fixes: bz#1576842
Signed-off-by: Susant Palai <spalai@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/xlators/features/cloudsync/src/cloudsync.h b/xlators/features/cloudsync/src/cloudsync.h
index bd54d760864..18840a6523d 100644
--- a/xlators/features/cloudsync/src/cloudsync.h
+++ b/xlators/features/cloudsync/src/cloudsync.h
@@ -34,6 +34,12 @@ typedef struct cs_inode_ctx {
         gf_cs_obj_state state;
 } cs_inode_ctx_t;
 
+struct cs_plugin {
+        char    *name; /* store name */
+        char    *library; /* library to load for the given store */
+        char    *description; /* description about the store */
+};
+
 cs_local_t *
 cs_local_init (xlator_t *this, call_frame_t *frame, loc_t *loc, fd_t *fd,
                glusterfs_fop_t fop);