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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>
#define NBDKIT_API_VERSION 2
#include <nbdkit-plugin.h>
/* level abuses our knowledge of internal nbdkit values:
* -1: force error during connect
* 0: no flush, no FUA
* 1: flush works, FUA is emulated
* 2: flush works, FUA is native
*/
static int level = -1;
static int
flush_config (const char *key, const char *value)
{
if (strcmp (key, "level") == 0)
return nbdkit_parse_int (key, value, &level);
nbdkit_error ("unknown parameter '%s'", key);
return -1;
}
/* Implements both .can_flush and .can_fua */
static int
flush_level (void *handle)
{
return level;
}
static void *
flush_open (int readonly)
{
return NBDKIT_HANDLE_NOT_NEEDED;
}
static int64_t
flush_get_size (void *handle)
{
return 1024*1024;
}
#define THREAD_MODEL NBDKIT_THREAD_MODEL_PARALLEL
static int
flush_pread (void *handle, void *buf, uint32_t count, uint64_t offset,
uint32_t flags)
{
memset (buf, 0, count);
return 0;
}
static int
flush_pwrite (void *handle, const void *buf, uint32_t count, uint64_t offset,
uint32_t flags)
{
if (flags & NBDKIT_FLAG_FUA)
nbdkit_debug (" **handling native FUA");
return 0;
}
static int
flush_flush (void *handle, uint32_t flags)
{
nbdkit_debug (" **handling flush");
return 0;
}
static struct nbdkit_plugin plugin = {
.name = "flush",
.version = PACKAGE_VERSION,
.config = flush_config,
.magic_config_key = "level",
.open = flush_open,
.get_size = flush_get_size,
.pread = flush_pread,
.pwrite = flush_pwrite,
.can_flush = flush_level,
.can_fua = flush_level,
.flush = flush_flush,
};
NBDKIT_REGISTER_PLUGIN (plugin)
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