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authorAnand Avati <avati@redhat.com>2012-07-12 15:37:38 -0700
committerAnand Avati <avati@redhat.com>2012-07-18 12:10:44 -0700
commit2475e0193c4b4a37028bd8168113d6cd6949fe0e (patch)
treecc11b8a64601a94ac9c0603e3bc12eee9c796b56 /api/src/glfs-resolve.c
parent162505c019934c13aadf63ed82d4532d5cf5ca82 (diff)
gfapi: API/library for accessing gluster volumes
Change-Id: Ie4cbcf91b58218bebf23cf951c313aceeb29f311 BUG: 839950 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.com/3664 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com> Reviewed-by: Bharata B Rao <bharata.rao@gmail.com>
Diffstat (limited to 'api/src/glfs-resolve.c')
-rw-r--r--api/src/glfs-resolve.c244
1 files changed, 244 insertions, 0 deletions
diff --git a/api/src/glfs-resolve.c b/api/src/glfs-resolve.c
new file mode 100644
index 00000000000..c03c4154db0
--- /dev/null
+++ b/api/src/glfs-resolve.c
@@ -0,0 +1,244 @@
+/*
+ Copyright (c) 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.
+*/
+
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <inttypes.h>
+#include <limits.h>
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "stack.h"
+#include "event.h"
+#include "glfs-mem-types.h"
+#include "common-utils.h"
+#include "syncop.h"
+#include "call-stub.h"
+
+#include "glfs-internal.h"
+
+
+void
+glfs_first_lookup (xlator_t *subvol)
+{
+ loc_t loc = {0, };
+ int ret = -1;
+
+ loc.inode = subvol->itable->root;
+ memset (loc.gfid, 0, 16);
+ loc.gfid[15] = 1;
+ loc.path = "/";
+ loc.name = "";
+
+ ret = syncop_lookup (subvol, &loc, 0, 0, 0, 0);
+
+ gf_log (subvol->name, GF_LOG_DEBUG, "first lookup complete %d", ret);
+
+ return;
+}
+
+
+int
+glfs_loc_touchup (loc_t *loc)
+{
+ char *path = NULL;
+ int ret = -1;
+ char *bn = NULL;
+
+ ret = inode_path (loc->parent, loc->name, &path);
+
+ loc->path = path;
+
+ if (ret < 0 || !path) {
+ ret = -1;
+ errno = ENOMEM;
+ goto out;
+ }
+
+ bn = strrchr (path, '/');
+ if (bn)
+ bn++;
+ loc->name = bn;
+ ret = 0;
+out:
+ return ret;
+}
+
+
+inode_t *
+glfs_resolve_component (struct glfs *fs, xlator_t *subvol, inode_t *parent,
+ const char *component, struct iatt *iatt)
+{
+ loc_t loc = {0, };
+ inode_t *inode = NULL;
+ int reval = 0;
+ int ret = -1;
+ int glret = -1;
+ struct iatt ciatt = {0, };
+ uuid_t gfid;
+ dict_t *xattr_req = NULL;
+
+ loc.name = component;
+
+ loc.parent = inode_ref (parent);
+ uuid_copy (loc.pargfid, parent->gfid);
+
+ xattr_req = dict_new ();
+ if (!xattr_req) {
+ errno = ENOMEM;
+ goto out;
+ }
+
+ ret = dict_set_static_bin (xattr_req, "gfid-req", gfid, 16);
+ if (ret) {
+ errno = ENOMEM;
+ goto out;
+ }
+
+ loc.inode = inode_grep (parent->table, parent, component);
+
+ if (loc.inode) {
+ uuid_copy (loc.gfid, loc.inode->gfid);
+ reval = 1;
+ } else {
+ uuid_generate (gfid);
+ loc.inode = inode_new (parent->table);
+ }
+
+ if (!loc.inode)
+ goto out;
+
+
+ glret = glfs_loc_touchup (&loc);
+ if (glret < 0) {
+ ret = -1;
+ goto out;
+ }
+
+ ret = syncop_lookup (subvol, &loc, xattr_req, &ciatt, NULL, NULL);
+ if (ret && reval) {
+ inode_unref (loc.inode);
+ loc.inode = inode_new (parent->table);
+ if (!loc.inode)
+ goto out;
+ uuid_generate (gfid);
+ ret = syncop_lookup (subvol, &loc, xattr_req, &ciatt,
+ NULL, NULL);
+ }
+ if (ret)
+ goto out;
+
+ inode = inode_link (loc.inode, loc.parent, component, &ciatt);
+ if (inode)
+ inode_lookup (inode);
+ if (iatt)
+ *iatt = ciatt;
+out:
+ if (xattr_req)
+ dict_destroy (xattr_req);
+
+ loc_wipe (&loc);
+
+ return inode;
+}
+
+
+int
+glfs_resolve (struct glfs *fs, xlator_t *subvol, const char *origpath,
+ loc_t *loc, struct iatt *iatt)
+{
+ inode_t *inode = NULL;
+ inode_t *parent = NULL;
+ char *saveptr = NULL;
+ char *path = NULL;
+ char *component = NULL;
+ char *next_component = NULL;
+ int ret = -1;
+ struct iatt ciatt = {0, };
+
+ path = gf_strdup (origpath);
+ if (!path) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ parent = NULL;
+ inode = inode_ref (subvol->itable->root);
+
+ for (component = strtok_r (path, "/", &saveptr);
+ component; component = next_component) {
+
+ next_component = strtok_r (NULL, "/", &saveptr);
+
+ if (parent)
+ inode_unref (parent);
+
+ parent = inode;
+
+ inode = glfs_resolve_component (fs, subvol, parent,
+ component, &ciatt);
+ if (!inode)
+ break;
+
+ if (!next_component)
+ break;
+
+ if (!IA_ISDIR (ciatt.ia_type)) {
+ /* next_component exists and this component is
+ not a directory
+ */
+ inode_unref (inode);
+ inode = NULL;
+ ret = -1;
+ errno = ENOTDIR;
+ break;
+ }
+ }
+
+ if (parent && next_component)
+ /* resolution failed mid-way */
+ goto out;
+
+ /* At this point, all components up to the last parent directory
+ have been resolved successfully (@parent). Resolution of basename
+ might have failed (@inode) if at all.
+ */
+
+ loc->parent = parent;
+ if (parent) {
+ uuid_copy (loc->pargfid, parent->gfid);
+ loc->name = component;
+ }
+
+ loc->inode = inode;
+ if (inode) {
+ uuid_copy (loc->gfid, inode->gfid);
+ if (iatt)
+ *iatt = ciatt;
+ ret = 0;
+ }
+
+ glfs_loc_touchup (loc);
+out:
+ GF_FREE (path);
+
+ /* do NOT loc_wipe here as only last component might be missing */
+
+ return ret;
+}
+