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/*
Copyright (c) 2008-2010 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 Affero 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero 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) {
gf_log (this->name, GF_LOG_WARNING,
"%s: failed to create link file (%s)",
local->linkfile.loc.path, strerror (op_errno));
goto err;
}
xattr = get_new_dict ();
if (!xattr) {
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) {
op_errno = ENOMEM;
goto err;
}
ret = dict_set (xattr, "trusted.glusterfs.dht.linkto", str_data);
if (ret < 0) {
gf_log (this->name, GF_LOG_INFO,
"%s: failed to initialize linkfile data",
local->linkfile.loc.path);
}
str_data = NULL;
local->linkfile.stbuf = *stbuf;
if (uuid_is_null (local->linkfile.loc.inode->gfid))
uuid_copy (local->linkfile.loc.gfid, stbuf->ia_gfid);
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;
dict_t *dict = NULL;
int ret = 0;
local = frame->local;
local->linkfile.linkfile_cbk = linkfile_cbk;
local->linkfile.srcvol = tovol;
loc_copy (&local->linkfile.loc, loc);
if (!uuid_is_null (local->gfid)) {
dict = dict_new ();
if (!dict)
goto out;
ret = dict_set_static_bin (dict, "gfid-req", local->gfid, 16);
if (ret)
gf_log ("dht-linkfile", GF_LOG_INFO,
"%s: gfid set failed", loc->path);
} else if (local->params) {
dict = dict_ref (local->params);
}
if (!dict)
gf_log (frame->this->name, GF_LOG_INFO,
"dict is NULL, need to make sure gfid's are same");
STACK_WIND (frame, dht_linkfile_create_cbk,
fromvol, fromvol->fops->mknod, loc,
S_IFREG | DHT_LINKFILE_MODE, 0, dict);
if (dict)
dict_unref (dict);
return 0;
out:
local->linkfile.linkfile_cbk (frame, NULL, frame->this, -1, ENOMEM,
loc->inode, NULL, NULL, NULL);
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_INFO,
"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) {
goto err;
}
unlink_local = dht_local_init (unlink_frame);
if (!unlink_local) {
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;
}
int
dht_recreate_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;
xlator_t *subvol = NULL;
xlator_t *src_cached = NULL;
xlator_t *dst_hashed = NULL;
call_frame_t *prev = NULL;
loc_t *loc = NULL;
GF_VALIDATE_OR_GOTO ("dht", frame, err);
GF_VALIDATE_OR_GOTO ("dht", this, err);
GF_VALIDATE_OR_GOTO ("dht", frame->local, err);
local = frame->local;
prev = cookie;
subvol = prev->this;
src_cached = local->src_cached;
dst_hashed = local->dst_hashed;
loc = &local->loc;
if (!src_cached || !dst_hashed) {
gf_log (this->name, GF_LOG_ERROR, "src_cached or dst_hashed"
"subvol is null");
local->op_ret = -1;
local->op_errno = EINVAL;
goto out;
}
if (op_ret == -1) {
gf_log (this->name, GF_LOG_ERROR,
"unlinking linkfile %s on %s failed (%s)",
loc->path, subvol->name, strerror (op_errno));
local->op_ret = op_ret;
local->op_errno = op_errno;
goto out;
}
gf_log (this->name, GF_LOG_DEBUG, "unlink successfull. Proceeding with"
" creation of link file %s", loc->path);
dht_linkfile_create (frame, local->linkfile.linkfile_cbk,
src_cached, dst_hashed, loc);
return 0;
out:
local->linkfile.linkfile_cbk (frame, NULL, frame->this, -1, EINVAL,
local->loc.inode, NULL, NULL, NULL);
err:
return -1;
}
int
dht_linkfile_recreate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno,
inode_t *inode, struct iatt *stbuf, dict_t *xattr,
struct iatt *postparent)
{
dht_local_t *local = NULL;
xlator_t *src_cached = NULL;
xlator_t *dst_hashed = NULL;
loc_t *loc = NULL;
GF_VALIDATE_OR_GOTO ("dht", frame, err);
GF_VALIDATE_OR_GOTO ("dht", this, err);
GF_VALIDATE_OR_GOTO ("dht", frame->local, err);
local = frame->local;
loc = &local->loc;
src_cached = local->src_cached;
dst_hashed = local->dst_hashed;
if (!src_cached || !dst_hashed) {
gf_log (this->name, GF_LOG_ERROR, "src_cached or dst_hashed"
" or hashed_subvol is null");
local->op_ret = -1;
local->op_errno = EINVAL;
goto out;
}
/* if link_file exists, remove it, else create it*/
if (!op_ret) {
if (!check_is_linkfile (inode, stbuf, xattr))
goto out;
gf_log (this->name, GF_LOG_DEBUG, "link file exists."
" Calling unlink on %s", loc->path);
STACK_WIND (frame, dht_recreate_linkfile_unlink_cbk,
dst_hashed, dst_hashed->fops->unlink,
loc);
} else if (op_errno == ENOENT) {
gf_log (this->name, GF_LOG_DEBUG, "link file does not exist."
" Proceeding to creation of linkfile %s", loc->path);
dht_linkfile_create (frame, local->linkfile.linkfile_cbk,
src_cached, dst_hashed, loc);
} else {
gf_log (this->name, GF_LOG_ERROR, "returned error %s",
strerror(op_errno));
local->op_ret = op_ret;
local->op_errno = op_errno;
goto out;
}
return 0;
out:
local->linkfile.linkfile_cbk (frame, NULL, frame->this, -1, EINVAL,
loc->inode, NULL, NULL, NULL);
err:
return -1;
}
int
dht_linkfile_recreate (call_frame_t *frame, fop_mknod_cbk_t linkfile_cbk,
xlator_t *tovol, xlator_t *fromvol, loc_t *loc)
{
dht_local_t *local = NULL;
GF_VALIDATE_OR_GOTO ("dht", frame, out);
GF_VALIDATE_OR_GOTO ("dht", loc, out);
GF_VALIDATE_OR_GOTO ("dht", tovol, out);
GF_VALIDATE_OR_GOTO ("dht", fromvol, out);
local = frame->local;
local->linkfile.linkfile_cbk = linkfile_cbk;
local->linkfile.srcvol = tovol;
loc_copy (&local->linkfile.loc, loc);
STACK_WIND (frame, dht_linkfile_recreate_cbk,
fromvol, fromvol->fops->lookup, loc, NULL);
return 0;
out:
linkfile_cbk (frame, NULL, frame->this, -1, EINVAL, loc->inode, NULL,
NULL, NULL);
return -1;
}
|
