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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
*/
/* Demonstrate low-level use of nbd_opt_structured_reply(). */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <libnbd.h>
static int
check_extent (void *data, const char *metacontext, uint64_t offset,
uint32_t *entries, size_t nr_entries, int *error)
{
/* If we got here, structured replies were negotiated. */
bool *seen = data;
*seen = true;
return 0;
}
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
const char *cmd[] = {
NBDKIT, "-s", "-v", "--exit-with-parent", "memory", "1048576", NULL
};
int r;
bool extents_worked = false;
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Connect to the server in opt mode, without structured replies. */
if (nbd_set_opt_mode (nbd, true) == -1 ||
nbd_set_request_structured_replies (nbd, false) == -1 ||
nbd_connect_command (nbd, (char **)cmd) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
r = nbd_get_structured_replies_negotiated (nbd);
if (r == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (r != 0) {
fprintf (stderr, "%s: not expecting structured replies yet\n", argv[0]);
exit (EXIT_FAILURE);
}
/* First request should succeed. */
r = nbd_opt_structured_reply (nbd);
if (r == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (r != 1) {
fprintf (stderr, "%s: expecting structured replies\n", argv[0]);
exit (EXIT_FAILURE);
}
r = nbd_get_structured_replies_negotiated (nbd);
if (r == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (r != 1) {
fprintf (stderr, "%s: expecting structured replies\n", argv[0]);
exit (EXIT_FAILURE);
}
/* nbdkit 1.32 allows a second request, nbdkit 1.34 diagnoses it. */
r = nbd_opt_structured_reply (nbd);
if (r == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
printf ("%s: server's response to second request: %s\n", argv[0],
r ? "accepted" : "rejected");
/* Regardless of whether second request passed, structured replies were
* negotiated, so we should be able to do block status.
*/
r = nbd_get_structured_replies_negotiated (nbd);
if (r == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (r != 1) {
fprintf (stderr, "%s: expecting structured replies\n", argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_add_meta_context (nbd, LIBNBD_CONTEXT_BASE_ALLOCATION) == -1 ||
nbd_opt_go (nbd) == -1 ||
(r = nbd_can_meta_context (nbd, LIBNBD_CONTEXT_BASE_ALLOCATION)) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (r != 1) {
fprintf (stderr, "%s: expecting base:allocation support\n", argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_block_status (nbd, 65536, 0,
(nbd_extent_callback) { .callback = check_extent,
.user_data = &extents_worked },
0) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
if (!extents_worked) {
fprintf (stderr, "%s: expecting block_status success\n", argv[0]);
exit (EXIT_FAILURE);
}
nbd_close (nbd);
exit (EXIT_SUCCESS);
}
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