glusterfs_ctx_t: un-globalize the filesystem context

So far there has been a global glusterfs_ctx_t object which
represents the running instance of the filesystem (client or server).
It contains the various graphs, connection to the management daemon
over which new graphs are obtained, calls stacks issued on this
filesystem, and a bunch of such things.

With the introduction of libgfapi, it is no more true that there will
be only one filesystem context in a process. Applications can
be written to use libgfapi and obtain serveral instances of different
filesystems/volumes in the same process.

This involves messy untangling of assumptions inside libglusterfs that
there would only be one global glusterfs_ctx_t and offload that
assumption to glusterfsd/ and cli/ (where it is true).

Change-Id: Ifd7d1259428c26076140a5764a2dc7361694139c
BUG: 839950
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.com/3678
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/libglusterfs/src/ctx.c b/libglusterfs/src/ctx.c
new file mode 100644
index 00000000000..22591317d86
--- /dev/null
+++ b/libglusterfs/src/ctx.c
@@ -0,0 +1,47 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif /* !_CONFIG_H */
+
+#include <pthread.h>
+
+#include "glusterfs.h"
+#include "mem-pool.h"
+
+
+glusterfs_ctx_t *
+glusterfs_ctx_new ()
+{
+        int               ret = 0;
+	glusterfs_ctx_t  *ctx = NULL;
+
+	/* no GF_CALLOC here, gf_acct_mem_set_enable is not
+	   yet decided at this point */
+        ctx = CALLOC (1, sizeof (*ctx));
+        if (!ctx) {
+                ret = -1;
+                goto out;
+        }
+
+        INIT_LIST_HEAD (&ctx->graphs);
+	INIT_LIST_HEAD (&ctx->mempool_list);
+
+	ret = pthread_mutex_init (&ctx->lock, NULL);
+	if (ret) {
+		FREE (ctx);
+		ctx = NULL;
+	}
+out:
+	return ctx;
+}
+