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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/>.
*/
#include "xlator.h"
#include "call-stub.h"
#include "defaults.h"
#include "dict.h"
#include "compat-errno.h"
#include "ha.h"
#define HA_TRANSPORT_NOTCONN(_ret, _errno, _fd) \
((_ret == -1) && (_fd ? (_errno == EBADFD):(_errno == ENOTCONN)))
int ha_alloc_init_fd (call_frame_t *frame, fd_t *fd)
{
ha_local_t *local = NULL;
int i = -1;
ha_private_t *pvt = NULL;
int child_count = 0;
int ret = -1;
hafd_t *hafdp = NULL;
xlator_t *this = NULL;
uint64_t tmp_hafdp = 0;
this = frame->this;
local = frame->local;
pvt = this->private;
child_count = pvt->child_count;
if (local == NULL) {
ret = fd_ctx_get (fd, this, &tmp_hafdp);
if (ret < 0) {
goto out;
}
hafdp = (hafd_t *)(long)tmp_hafdp;
local = frame->local = GF_CALLOC (1, sizeof (*local),
gf_ha_mt_ha_local_t);
if (local == NULL) {
ret = -ENOMEM;
goto out;
}
local->state = GF_CALLOC (1, child_count,
gf_ha_mt_child_count);
if (local->state == NULL) {
ret = -ENOMEM;
goto out;
}
/* take care of the preferred subvolume */
if (pvt->pref_subvol == -1)
local->active = hafdp->active;
else
local->active = pvt->pref_subvol;
LOCK (&hafdp->lock);
memcpy (local->state, hafdp->fdstate, child_count);
UNLOCK (&hafdp->lock);
/* in case the preferred subvolume is down */
if ((local->active != -1) && (local->state[local->active] == 0))
local->active = -1;
for (i = 0; i < child_count; i++) {
if (local->state[i]) {
if (local->active == -1)
local->active = i;
local->tries++;
}
}
if (local->active == -1) {
ret = -ENOTCONN;
goto out;
}
local->fd = fd_ref (fd);
}
ret = 0;
out:
return ret;
}
int ha_handle_cbk (call_frame_t *frame, void *cookie, int op_ret, int op_errno)
{
xlator_t *xl = NULL;
ha_private_t *pvt = NULL;
xlator_t **children = NULL;
int prev_child = -1;
hafd_t *hafdp = NULL;
int ret = -1;
call_stub_t *stub = NULL;
ha_local_t *local = NULL;
uint64_t tmp_hafdp = 0;
xl = frame->this;
pvt = xl->private;
children = pvt->children;
prev_child = (long) cookie;
local = frame->local;
if (op_ret == -1) {
gf_log (xl->name, GF_LOG_ERROR ,"(child=%s) (op_ret=%d op_errno=%s)",
children[prev_child]->name, op_ret, strerror (op_errno));
}
if (HA_TRANSPORT_NOTCONN (op_ret, op_errno, (local->fd))) {
ret = 0;
if (local->fd) {
ret = fd_ctx_get (local->fd, xl, &tmp_hafdp);
}
hafdp = (hafd_t *)(long)tmp_hafdp;
if (ret == 0) {
if (local->fd) {
LOCK(&hafdp->lock);
hafdp->fdstate[prev_child] = 0;
UNLOCK(&hafdp->lock);
}
local->tries--;
if (local->tries != 0) {
while (1) {
local->active = (local->active + 1) % pvt->child_count;
if (local->state[local->active])
break;
}
stub = local->stub;
local->stub = NULL;
call_resume (stub);
return -1;
}
}
}
if (local->stub) {
call_stub_destroy (local->stub);
local->stub = NULL;
}
if (local->fd) {
GF_FREE (local->state);
local->state = NULL;
fd_unref (local->fd);
local->fd = NULL;
}
return 0;
}
int ha_alloc_init_inode (call_frame_t *frame, inode_t *inode)
{
int i = -1;
ha_private_t *pvt = NULL;
xlator_t *xl = NULL;
int ret = -1;
ha_local_t *local = NULL;
uint64_t tmp_state = 0;
xl = frame->this;
pvt = xl->private;
local = frame->local;
if (local == NULL) {
local = frame->local = GF_CALLOC (1, sizeof (*local),
gf_ha_mt_ha_local_t);
if (local == NULL) {
ret = -ENOMEM;
goto out;
}
local->active = pvt->pref_subvol;
ret = inode_ctx_get (inode, xl, &tmp_state);
if (ret < 0) {
goto out;
}
local->state = (char *)(long)tmp_state;
if (local->active != -1 && local->state[local->active] == 0)
local->active = -1;
for (i = 0; i < pvt->child_count; i++) {
if (local->state[i]) {
if (local->active == -1)
local->active = i;
local->tries++;
}
}
if (local->active == -1) {
ret = -ENOTCONN;
goto out;
}
}
ret = 0;
out:
return ret;
}
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