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/*
Copyright (c) 2008-2009 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "glusterfs.h"
#include "xlator.h"
#include "compat.h"
#include "dht-common.h"
int
dht_linkfile_xattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno)
{
dht_local_t *local = NULL;
local = frame->local;
local->linkfile.linkfile_cbk (frame, cookie, this, op_ret, op_errno,
local->linkfile.inode,
&local->linkfile.stbuf, NULL, NULL);
return 0;
}
int
dht_linkfile_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno, inode_t *inode,
struct iatt *stbuf, struct iatt *preparent,
struct iatt *postparent)
{
dht_local_t *local = NULL;
call_frame_t *prev = NULL;
dict_t *xattr = NULL;
data_t *str_data = NULL;
int ret = -1;
local = frame->local;
prev = cookie;
if (op_ret == -1)
goto err;
xattr = get_new_dict ();
if (!xattr) {
gf_log (this->name, GF_LOG_ERROR,
"Out of memory");
op_errno = ENOMEM;
goto err;
}
local->linkfile.xattr = dict_ref (xattr);
local->linkfile.inode = inode_ref (inode);
str_data = str_to_data (local->linkfile.srcvol->name);
if (!str_data) {
gf_log (this->name, GF_LOG_ERROR,
"Out of memory");
op_errno = ENOMEM;
goto err;
}
ret = dict_set (xattr, "trusted.glusterfs.dht.linkto", str_data);
if (ret < 0) {
gf_log (this->name, GF_LOG_DEBUG,
"failed to initialize linkfile data");
op_errno = EINVAL;
}
str_data = NULL;
local->linkfile.stbuf = *stbuf;
STACK_WIND (frame, dht_linkfile_xattr_cbk,
prev->this, prev->this->fops->setxattr,
&local->linkfile.loc, local->linkfile.xattr, 0);
return 0;
err:
if (str_data) {
data_destroy (str_data);
str_data = NULL;
}
local->linkfile.linkfile_cbk (frame, cookie, this, op_ret, op_errno,
inode, stbuf, preparent, postparent);
return 0;
}
int
dht_linkfile_create (call_frame_t *frame, fop_mknod_cbk_t linkfile_cbk,
xlator_t *tovol, xlator_t *fromvol, loc_t *loc)
{
dht_local_t *local = NULL;
local = frame->local;
local->linkfile.linkfile_cbk = linkfile_cbk;
local->linkfile.srcvol = tovol;
loc_copy (&local->linkfile.loc, loc);
STACK_WIND (frame, dht_linkfile_create_cbk,
fromvol, fromvol->fops->mknod, loc,
S_IFREG | DHT_LINKFILE_MODE, 0);
return 0;
}
int
dht_linkfile_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno,
struct iatt *preparent, struct iatt *postparent)
{
dht_local_t *local = NULL;
call_frame_t *prev = NULL;
xlator_t *subvol = NULL;
local = frame->local;
prev = cookie;
subvol = prev->this;
if (op_ret == -1) {
gf_log (this->name, GF_LOG_DEBUG,
"unlinking linkfile %s on %s failed (%s)",
local->loc.path, subvol->name, strerror (op_errno));
}
DHT_STACK_DESTROY (frame);
return 0;
}
int
dht_linkfile_unlink (call_frame_t *frame, xlator_t *this,
xlator_t *subvol, loc_t *loc)
{
call_frame_t *unlink_frame = NULL;
dht_local_t *unlink_local = NULL;
unlink_frame = copy_frame (frame);
if (!unlink_frame) {
gf_log (this->name, GF_LOG_ERROR,
"Out of memory");
goto err;
}
unlink_local = dht_local_init (unlink_frame);
if (!unlink_local) {
gf_log (this->name, GF_LOG_ERROR,
"Out of memory");
goto err;
}
loc_copy (&unlink_local->loc, loc);
STACK_WIND (unlink_frame, dht_linkfile_unlink_cbk,
subvol, subvol->fops->unlink,
&unlink_local->loc);
return 0;
err:
if (unlink_frame)
DHT_STACK_DESTROY (unlink_frame);
return -1;
}
xlator_t *
dht_linkfile_subvol (xlator_t *this, inode_t *inode, struct iatt *stbuf,
dict_t *xattr)
{
dht_conf_t *conf = NULL;
xlator_t *subvol = NULL;
void *volname = NULL;
int i = 0, ret = 0;
conf = this->private;
if (!xattr)
goto out;
ret = dict_get_ptr (xattr, "trusted.glusterfs.dht.linkto", &volname);
if ((-1 == ret) || !volname)
goto out;
for (i = 0; i < conf->subvolume_cnt; i++) {
if (strcmp (conf->subvolumes[i]->name, (char *)volname) == 0) {
subvol = conf->subvolumes[i];
break;
}
}
out:
return subvol;
}
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