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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 <fcntl.h>
#include <unistd.h>
#include "nbdcopy.h"
static struct rw_ops pipe_ops;
struct rw_pipe {
struct rw rw;
int fd;
};
struct rw *
pipe_create (const char *name, int fd)
{
struct rw_pipe *rwp = calloc (1, sizeof *rwp);
if (rwp == NULL) { perror ("calloc"); exit (EXIT_FAILURE); }
/* Set size == -1 which means don't know. */
rwp->rw.ops = &pipe_ops;
rwp->rw.name = name;
rwp->rw.size = -1;
rwp->rw.preferred = 4096;
rwp->fd = fd;
return &rwp->rw;
}
static void
pipe_close (struct rw *rw)
{
struct rw_pipe *rwp = (struct rw_pipe *)rw;
if (close (rwp->fd) == -1) {
fprintf (stderr, "%s: close: %m\n", rw->name);
exit (EXIT_FAILURE);
}
}
static void
pipe_flush (struct rw *rw)
{
/* We don't need to do anything here as the close will return an
* error if the pipe could not be flushed.
*/
}
static bool
pipe_is_read_only (struct rw *rw)
{
return false;
}
static bool
pipe_can_extents (struct rw *rw)
{
return false;
}
static bool
pipe_can_multi_conn (struct rw *rw)
{
return false;
}
static void
pipe_start_multi_conn (struct rw *rw)
{
/* Should never be called. */
abort ();
}
static size_t
pipe_synch_read (struct rw *rw,
void *data, size_t len, uint64_t offset)
{
struct rw_pipe *rwp = (struct rw_pipe *)rw;
ssize_t r;
r = read (rwp->fd, data, len);
if (r == -1) {
perror (rw->name);
exit (EXIT_FAILURE);
}
return r;
}
static void
pipe_synch_write (struct rw *rw,
const void *data, size_t len, uint64_t offset)
{
struct rw_pipe *rwp = (struct rw_pipe *)rw;
while (len > 0) {
ssize_t r = write (rwp->fd, data, len);
if (r == -1) {
perror (rw->name);
exit (EXIT_FAILURE);
}
data = (char *)data + r;
len -= r;
}
}
static bool
pipe_synch_zero (struct rw *rw, uint64_t offset, uint64_t count, bool allocate)
{
return false; /* not supported by pipes */
}
static void
pipe_asynch_read (struct rw *rw,
struct command *command,
nbd_completion_callback cb)
{
abort (); /* See comment below. */
}
static void
pipe_asynch_write (struct rw *rw,
struct command *command,
nbd_completion_callback cb)
{
abort (); /* See comment below. */
}
static bool
pipe_asynch_zero (struct rw *rw, struct command *command,
nbd_completion_callback cb, bool allocate)
{
return false; /* not supported by pipes */
}
static unsigned
pipe_in_flight (struct rw *rw, size_t index)
{
return 0;
}
static struct rw_ops pipe_ops = {
.ops_name = "pipe_ops",
.close = pipe_close,
.is_read_only = pipe_is_read_only,
.can_extents = pipe_can_extents,
.can_multi_conn = pipe_can_multi_conn,
.start_multi_conn = pipe_start_multi_conn,
.flush = pipe_flush,
.synch_read = pipe_synch_read,
.synch_write = pipe_synch_write,
.synch_zero = pipe_synch_zero,
/* Asynch pipe read/write operations are not defined. These should
* never be called because pipes/streams/sockets force synchronous
* mode. Because calling a NULL pointer screws up the stack trace
* when we're not using frame pointers, these are defined to
* functions that call abort().
*/
.asynch_read = pipe_asynch_read,
.asynch_write = pipe_asynch_write,
.asynch_zero = pipe_asynch_zero,
.in_flight = pipe_in_flight,
.get_polling_fd = get_polling_fd_not_supported,
.asynch_notify_read = asynch_notify_read_write_not_supported,
.asynch_notify_write = asynch_notify_read_write_not_supported,
.get_extents = default_get_extents,
};
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