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/*
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;
}
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