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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include "internal.h"
/* Internal functions to test state or groups of states. */
bool
nbd_internal_is_state_created (enum state state)
{
return state == STATE_START;
}
static int
is_connecting_group (enum state_group group)
{
switch (group) {
case GROUP_TOP:
return 0;
case GROUP_CONNECT:
case GROUP_CONNECT_TCP:
case GROUP_CONNECT_COMMAND:
case GROUP_MAGIC:
case GROUP_OLDSTYLE:
case GROUP_NEWSTYLE:
return 1;
default:
return is_connecting_group (nbd_internal_state_group_parent (group));
}
}
bool
nbd_internal_is_state_connecting (enum state state)
{
enum state_group group = nbd_internal_state_group (state);
return is_connecting_group (group);
}
bool
nbd_internal_is_state_negotiating (enum state state)
{
return state == STATE_NEGOTIATING;
}
bool
nbd_internal_is_state_ready (enum state state)
{
return state == STATE_READY;
}
static int
is_processing_group (enum state_group group)
{
switch (group) {
case GROUP_TOP:
return 0;
case GROUP_ISSUE_COMMAND:
case GROUP_REPLY:
return 1;
default:
return is_processing_group (nbd_internal_state_group_parent (group));
}
}
bool
nbd_internal_is_state_processing (enum state state)
{
enum state_group group = nbd_internal_state_group (state);
return is_processing_group (group);
}
bool
nbd_internal_is_state_dead (enum state state)
{
return state == STATE_DEAD;
}
bool
nbd_internal_is_state_closed (enum state state)
{
return state == STATE_CLOSED;
}
/* The nbd_unlocked_aio_is_* and nbd_unlocked_aio_get_direction calls are
* the public APIs for reading the state of the handle.
*
* They all have: is_locked = false, may_set_error = false.
*
* They all read the public state, not the real state. Therefore you
* SHOULD NOT call these functions from elsewhere in the library (use
* nbd_internal_is_* and nbd_internal_aio_get_direction instead).
*/
int
nbd_unlocked_aio_is_created (struct nbd_handle *h)
{
return nbd_internal_is_state_created (get_public_state (h));
}
int
nbd_unlocked_aio_is_connecting (struct nbd_handle *h)
{
return nbd_internal_is_state_connecting (get_public_state (h));
}
int
nbd_unlocked_aio_is_negotiating (struct nbd_handle *h)
{
return nbd_internal_is_state_negotiating (get_public_state (h));
}
int
nbd_unlocked_aio_is_ready (struct nbd_handle *h)
{
return nbd_internal_is_state_ready (get_public_state (h));
}
int
nbd_unlocked_aio_is_processing (struct nbd_handle *h)
{
return nbd_internal_is_state_processing (get_public_state (h));
}
int
nbd_unlocked_aio_is_dead (struct nbd_handle *h)
{
return nbd_internal_is_state_dead (get_public_state (h));
}
int
nbd_unlocked_aio_is_closed (struct nbd_handle *h)
{
return nbd_internal_is_state_closed (get_public_state (h));
}
unsigned
nbd_unlocked_aio_get_direction (struct nbd_handle *h)
{
return nbd_internal_aio_get_direction (get_public_state (h));
}
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