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authorAnand Avati <avati@redhat.com>2014-03-26 11:52:53 -0700
committerAnand Avati <avati@redhat.com>2014-05-05 17:28:55 -0700
commit8160399a36eff62a49a066f16dea9140d877c5e8 (patch)
treee51d49bd93ff98822986569fdfada5d2819546b0 /xlators/meta/src/plugins/graph-dir.c
parent7fba3a88f1ced610eca0c23516a1e720d75160cd (diff)
meta: (re-)Implement Meta translator
The meta translator exposes details about glusterfs itself in the form of a virtual namespace. Loading the translator on the client side creates the meta virtual view under $mntpoint/.meta by default. The directory is not listed (even with ls -a) and can be accessed by doing a "cd /mnt/.meta" Change-Id: I5ffdf39203841a9562a8280a1f79dc76d4dded5d BUG: 1089216 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/7509 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
Diffstat (limited to 'xlators/meta/src/plugins/graph-dir.c')
-rw-r--r--xlators/meta/src/plugins/graph-dir.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/xlators/meta/src/plugins/graph-dir.c b/xlators/meta/src/plugins/graph-dir.c
new file mode 100644
index 00000000000..3cd6b482e74
--- /dev/null
+++ b/xlators/meta/src/plugins/graph-dir.c
@@ -0,0 +1,106 @@
+/*
+ Copyright (c) 2014 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
+
+#include "xlator.h"
+#include "defaults.h"
+
+#include "meta-mem-types.h"
+#include "meta.h"
+#include "meta-hooks.h"
+
+
+static struct meta_dirent graph_dir_dirents[] = {
+ DOT_DOTDOT,
+
+ { .name = "top",
+ .type = IA_IFLNK,
+ .hook = meta_top_link_hook,
+ },
+ { .name = "volfile",
+ .type = IA_IFREG,
+ .hook = meta_volfile_file_hook,
+ },
+ { .name = NULL }
+};
+
+
+static int
+graph_dir_fill (xlator_t *this, inode_t *inode, struct meta_dirent **dp)
+{
+ struct meta_dirent *dirents = NULL;
+ glusterfs_graph_t *graph = NULL;
+ int i = 0;
+ int count = 0;
+ xlator_t *xl = NULL;
+
+ graph = meta_ctx_get (inode, this);
+
+ for (xl = graph->first; xl; xl = xl->next)
+ count++;
+
+ dirents = GF_CALLOC (sizeof (*dirents), count, gf_meta_mt_dirents_t);
+ if (!dirents)
+ return -1;
+
+ i = 0;
+ for (xl = graph->first; xl; xl = xl->next) {
+ dirents[i].name = gf_strdup (xl->name);
+ dirents[i].type = IA_IFDIR;
+ dirents[i].hook = meta_xlator_dir_hook;
+ i++;
+ }
+
+ *dp = dirents;
+ return i;
+}
+
+
+struct meta_ops graph_dir_ops = {
+ .fixed_dirents = graph_dir_dirents,
+ .dir_fill = graph_dir_fill,
+};
+
+
+static glusterfs_graph_t *
+glusterfs_graph_lookup (xlator_t *this, const char *graph_uuid)
+{
+ glusterfs_graph_t *graph = NULL;
+ glusterfs_graph_t *tmp = NULL;
+
+ list_for_each_entry (tmp, &this->ctx->graphs, list) {
+ if (strcmp (graph_uuid, tmp->graph_uuid) == 0) {
+ graph = tmp;
+ break;
+ }
+ }
+
+ return graph;
+}
+
+
+int
+meta_graph_dir_hook (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ dict_t *xdata)
+{
+ glusterfs_graph_t *graph = NULL;
+
+ graph = glusterfs_graph_lookup (this, loc->name);
+
+ meta_ops_set (loc->inode, this, &graph_dir_ops);
+
+ meta_ctx_set (loc->inode, this, (void *) graph);
+
+ return 0;
+}