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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <nbdkit-plugin.h>
static void
disconnect_unload (void)
{
nbdkit_debug ("clean disconnect");
}
static void *
disconnect_open (int readonly)
{
return NBDKIT_HANDLE_NOT_NEEDED;
}
static int64_t
disconnect_get_size (void *handle)
{
return 1024*1024;
}
#define THREAD_MODEL NBDKIT_THREAD_MODEL_PARALLEL
/* Reads are delayed to show effect of disconnect on in-flight commands */
static int
disconnect_pread (void *handle, void *buf, uint32_t count, uint64_t offset)
{
memset (buf, 0, count);
if (nbdkit_nanosleep (2, 0) == -1)
nbdkit_debug ("read delay ended early, returning success anyway");
return 0;
}
/* Writing causes a disconnect; export name determines severity. */
static int
disconnect_pwrite (void *handle, const void *buf, uint32_t count,
uint64_t offset)
{
const char *name = nbdkit_export_name ();
bool hard = name && *name;
nbdkit_debug ("%s disconnect triggered!", hard ? "hard" : "soft");
nbdkit_disconnect (hard);
/* Despite the disconnect, we still claim the write succeeded */
return 0;
}
static struct nbdkit_plugin plugin = {
.name = "disconnect",
.version = PACKAGE_VERSION,
.unload = disconnect_unload,
.open = disconnect_open,
.get_size = disconnect_get_size,
.pread = disconnect_pread,
.pwrite = disconnect_pwrite,
};
NBDKIT_REGISTER_PLUGIN (plugin)
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