#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
+#include "qemu/module.h"
+#include "qemu/option.h"
+#include "block/block-io.h"
#include "block/block_int.h"
+#include "sysemu/replay.h"
#define NULL_OPT_LATENCY "latency-ns"
#define NULL_OPT_ZEROES "read-zeroes"
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
- .name = "filename",
- .type = QEMU_OPT_STRING,
- .help = "",
- },
- {
.name = BLOCK_OPT_SIZE,
.type = QEMU_OPT_SIZE,
.help = "size of the null block",
},
};
+static void null_co_parse_filename(const char *filename, QDict *options,
+ Error **errp)
+{
+ /* This functions only exists so that a null-co:// filename is accepted
+ * with the null-co driver. */
+ if (strcmp(filename, "null-co://")) {
+ error_setg(errp, "The only allowed filename for this driver is "
+ "'null-co://'");
+ return;
+ }
+}
+
+static void null_aio_parse_filename(const char *filename, QDict *options,
+ Error **errp)
+{
+ /* This functions only exists so that a null-aio:// filename is accepted
+ * with the null-aio driver. */
+ if (strcmp(filename, "null-aio://")) {
+ error_setg(errp, "The only allowed filename for this driver is "
+ "'null-aio://'");
+ return;
+ }
+}
+
static int null_file_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
}
s->read_zeroes = qemu_opt_get_bool(opts, NULL_OPT_ZEROES, false);
qemu_opts_del(opts);
+ bs->supported_write_flags = BDRV_REQ_FUA;
return ret;
}
-static void null_close(BlockDriverState *bs)
-{
-}
-
-static int64_t null_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn null_co_getlength(BlockDriverState *bs)
{
BDRVNullState *s = bs->opaque;
return s->length;
BDRVNullState *s = bs->opaque;
if (s->latency_ns) {
- co_aio_sleep_ns(bdrv_get_aio_context(bs), QEMU_CLOCK_REALTIME,
- s->latency_ns);
+ qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, s->latency_ns);
}
return 0;
}
-static coroutine_fn int null_co_readv(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors,
- QEMUIOVector *qiov)
+static coroutine_fn int null_co_preadv(BlockDriverState *bs,
+ int64_t offset, int64_t bytes,
+ QEMUIOVector *qiov,
+ BdrvRequestFlags flags)
{
BDRVNullState *s = bs->opaque;
if (s->read_zeroes) {
- qemu_iovec_memset(qiov, 0, 0, nb_sectors * BDRV_SECTOR_SIZE);
+ qemu_iovec_memset(qiov, 0, 0, bytes);
}
return null_co_common(bs);
}
-static coroutine_fn int null_co_writev(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors,
- QEMUIOVector *qiov)
+static coroutine_fn int null_co_pwritev(BlockDriverState *bs,
+ int64_t offset, int64_t bytes,
+ QEMUIOVector *qiov,
+ BdrvRequestFlags flags)
{
return null_co_common(bs);
}
typedef struct {
BlockAIOCB common;
- QEMUBH *bh;
QEMUTimer timer;
} NullAIOCB;
{
NullAIOCB *acb = opaque;
acb->common.cb(acb->common.opaque, 0);
- qemu_bh_delete(acb->bh);
qemu_aio_unref(acb);
}
timer_mod_ns(&acb->timer,
qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + s->latency_ns);
} else {
- acb->bh = aio_bh_new(bdrv_get_aio_context(bs), null_bh_cb, acb);
- qemu_bh_schedule(acb->bh);
+ replay_bh_schedule_oneshot_event(bdrv_get_aio_context(bs),
+ null_bh_cb, acb);
}
return &acb->common;
}
-static BlockAIOCB *null_aio_readv(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov,
- int nb_sectors,
- BlockCompletionFunc *cb,
- void *opaque)
+static BlockAIOCB *null_aio_preadv(BlockDriverState *bs,
+ int64_t offset, int64_t bytes,
+ QEMUIOVector *qiov, BdrvRequestFlags flags,
+ BlockCompletionFunc *cb,
+ void *opaque)
{
BDRVNullState *s = bs->opaque;
if (s->read_zeroes) {
- qemu_iovec_memset(qiov, 0, 0, nb_sectors * BDRV_SECTOR_SIZE);
+ qemu_iovec_memset(qiov, 0, 0, bytes);
}
return null_aio_common(bs, cb, opaque);
}
-static BlockAIOCB *null_aio_writev(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov,
- int nb_sectors,
- BlockCompletionFunc *cb,
- void *opaque)
+static BlockAIOCB *null_aio_pwritev(BlockDriverState *bs,
+ int64_t offset, int64_t bytes,
+ QEMUIOVector *qiov, BdrvRequestFlags flags,
+ BlockCompletionFunc *cb,
+ void *opaque)
{
return null_aio_common(bs, cb, opaque);
}
return 0;
}
-static int64_t coroutine_fn null_co_get_block_status(BlockDriverState *bs,
- int64_t sector_num,
- int nb_sectors, int *pnum,
- BlockDriverState **file)
+static int coroutine_fn null_co_block_status(BlockDriverState *bs,
+ bool want_zero, int64_t offset,
+ int64_t bytes, int64_t *pnum,
+ int64_t *map,
+ BlockDriverState **file)
{
BDRVNullState *s = bs->opaque;
- off_t start = sector_num * BDRV_SECTOR_SIZE;
+ int ret = BDRV_BLOCK_OFFSET_VALID;
- *pnum = nb_sectors;
+ *pnum = bytes;
+ *map = offset;
*file = bs;
if (s->read_zeroes) {
- return BDRV_BLOCK_OFFSET_VALID | start | BDRV_BLOCK_ZERO;
- } else {
- return BDRV_BLOCK_OFFSET_VALID | start;
+ ret |= BDRV_BLOCK_ZERO;
}
+ return ret;
}
-static void null_refresh_filename(BlockDriverState *bs, QDict *opts)
+static void null_refresh_filename(BlockDriverState *bs)
{
- QINCREF(opts);
- qdict_del(opts, "filename");
-
- if (!qdict_size(opts)) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
- bs->drv->format_name);
+ const QDictEntry *e;
+
+ for (e = qdict_first(bs->full_open_options); e;
+ e = qdict_next(bs->full_open_options, e))
+ {
+ /* These options can be ignored */
+ if (strcmp(qdict_entry_key(e), "filename") &&
+ strcmp(qdict_entry_key(e), "driver") &&
+ strcmp(qdict_entry_key(e), NULL_OPT_LATENCY))
+ {
+ return;
+ }
}
- qdict_put(opts, "driver", qstring_from_str(bs->drv->format_name));
- bs->full_open_options = opts;
+ snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
+ bs->drv->format_name);
}
+static int64_t coroutine_fn
+null_co_get_allocated_file_size(BlockDriverState *bs)
+{
+ return 0;
+}
+
+static const char *const null_strong_runtime_opts[] = {
+ BLOCK_OPT_SIZE,
+ NULL_OPT_ZEROES,
+
+ NULL
+};
+
static BlockDriver bdrv_null_co = {
.format_name = "null-co",
.protocol_name = "null-co",
.instance_size = sizeof(BDRVNullState),
.bdrv_file_open = null_file_open,
- .bdrv_close = null_close,
- .bdrv_getlength = null_getlength,
+ .bdrv_parse_filename = null_co_parse_filename,
+ .bdrv_co_getlength = null_co_getlength,
+ .bdrv_co_get_allocated_file_size = null_co_get_allocated_file_size,
- .bdrv_co_readv = null_co_readv,
- .bdrv_co_writev = null_co_writev,
+ .bdrv_co_preadv = null_co_preadv,
+ .bdrv_co_pwritev = null_co_pwritev,
.bdrv_co_flush_to_disk = null_co_flush,
.bdrv_reopen_prepare = null_reopen_prepare,
- .bdrv_co_get_block_status = null_co_get_block_status,
+ .bdrv_co_block_status = null_co_block_status,
.bdrv_refresh_filename = null_refresh_filename,
+ .strong_runtime_opts = null_strong_runtime_opts,
};
static BlockDriver bdrv_null_aio = {
.instance_size = sizeof(BDRVNullState),
.bdrv_file_open = null_file_open,
- .bdrv_close = null_close,
- .bdrv_getlength = null_getlength,
+ .bdrv_parse_filename = null_aio_parse_filename,
+ .bdrv_co_getlength = null_co_getlength,
+ .bdrv_co_get_allocated_file_size = null_co_get_allocated_file_size,
- .bdrv_aio_readv = null_aio_readv,
- .bdrv_aio_writev = null_aio_writev,
+ .bdrv_aio_preadv = null_aio_preadv,
+ .bdrv_aio_pwritev = null_aio_pwritev,
.bdrv_aio_flush = null_aio_flush,
.bdrv_reopen_prepare = null_reopen_prepare,
- .bdrv_co_get_block_status = null_co_get_block_status,
+ .bdrv_co_block_status = null_co_block_status,
.bdrv_refresh_filename = null_refresh_filename,
+ .strong_runtime_opts = null_strong_runtime_opts,
};
static void bdrv_null_init(void)
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