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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 <stdint.h>
#include <errno.h>
#include <inttypes.h>
#include <assert.h>
#include "internal.h"
int
nbd_unlocked_shutdown (struct nbd_handle *h, uint32_t flags)
{
/* If we are still in opt mode, end it gracefully. */
if (nbd_internal_is_state_negotiating (get_next_state (h))) {
if (nbd_unlocked_aio_opt_abort (h) == -1)
return -1;
goto wait;
}
/* If ABANDON_PENDING, abort any commands that have not yet had any
* bytes sent to the server, so NBD_CMD_DISC becomes next in line.
*/
if (flags & LIBNBD_SHUTDOWN_ABANDON_PENDING) {
struct command **cmd = &h->cmds_to_issue;
if (!nbd_internal_is_state_ready (get_next_state (h))) {
assert (*cmd);
h->cmds_to_issue_tail = *cmd;
cmd = &(*cmd)->next;
}
nbd_internal_abort_commands (h, cmd);
}
if (!h->disconnect_request &&
(nbd_internal_is_state_ready (get_next_state (h)) ||
nbd_internal_is_state_processing (get_next_state (h)))) {
if (nbd_unlocked_aio_disconnect (h, 0) == -1)
return -1;
}
wait:
while (!nbd_internal_is_state_closed (get_next_state (h)) &&
!nbd_internal_is_state_dead (get_next_state (h))) {
if (nbd_unlocked_poll (h, -1) == -1)
return -1;
}
return 0;
}
int
nbd_unlocked_aio_disconnect (struct nbd_handle *h, uint32_t flags)
{
int64_t id;
id = nbd_internal_command_common (h, flags, NBD_CMD_DISC, 0, 0, 0,
NULL, NULL);
if (id == -1)
return -1;
h->disconnect_request = true;
/* As the server does not reply to this command, it is left
* in-flight until the cleanup performed when moving to CLOSED or
* DEAD. We don't return a handle to the user, and thus also
* special case things so that the user cannot request the status of
* this command during aio_[peek_]command_completed.
*/
return 0;
}
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