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block/io: refactor coroutine wrappers

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Most of our coroutine wrappers already follow this convention:

We have 'coroutine_fn bdrv_co_<something>(<normal argument list>)' as
the core function, and a wrapper 'bdrv_<something>(<same argument
list>)' which does parameter packing and calls bdrv_run_co().

The only outsiders are the bdrv_prwv_co and
bdrv_common_block_status_above wrappers. Let's refactor them to behave
as the others, it simplifies further conversion of coroutine wrappers.

This patch adds an indirection layer, but it will be compensated by
a further commit, which will drop bdrv_co_prwv together with the
is_write logic, to keep the read and write paths separate.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200924185414.28642-3-vsementsov@virtuozzo.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-09-24 21:54:09 +03:00 committed by Stefan Hajnoczi
parent 5416645fcf
commit f9e694cb32
1 changed files with 32 additions and 28 deletions
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36
block/io.c
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@ -933,25 +933,29 @@ typedef struct RwCo {
BdrvRequestFlags flags;
} RwCo;
static int coroutine_fn bdrv_co_prwv(BdrvChild *child, int64_t offset,
QEMUIOVector *qiov, bool is_write,
BdrvRequestFlags flags)
{
if (is_write) {
return bdrv_co_pwritev(child, offset, qiov->size, qiov, flags);
} else {
return bdrv_co_preadv(child, offset, qiov->size, qiov, flags);
}
}
static int coroutine_fn bdrv_rw_co_entry(void *opaque)
{
RwCo *rwco = opaque;
if (!rwco->is_write) {
return bdrv_co_preadv(rwco->child, rwco->offset,
rwco->qiov->size, rwco->qiov,
rwco->flags);
} else {
return bdrv_co_pwritev(rwco->child, rwco->offset,
rwco->qiov->size, rwco->qiov,
rwco->flags);
}
return bdrv_co_prwv(rwco->child, rwco->offset, rwco->qiov,
rwco->is_write, rwco->flags);
}
/*
* Process a vectored synchronous request using coroutines
*/
static int bdrv_prwv_co(BdrvChild *child, int64_t offset,
static int bdrv_prwv(BdrvChild *child, int64_t offset,
QEMUIOVector *qiov, bool is_write,
BdrvRequestFlags flags)
{
@ -971,8 +975,7 @@ int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
{
QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, NULL, bytes);
return bdrv_prwv_co(child, offset, &qiov, true,
BDRV_REQ_ZERO_WRITE | flags);
return bdrv_prwv(child, offset, &qiov, true, BDRV_REQ_ZERO_WRITE | flags);
}
/*
@ -1021,7 +1024,7 @@ int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov)
{
int ret;
ret = bdrv_prwv_co(child, offset, qiov, false, 0);
ret = bdrv_prwv(child, offset, qiov, false, 0);
if (ret < 0) {
return ret;
}
@ -1045,7 +1048,7 @@ int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov)
{
int ret;
ret = bdrv_prwv_co(child, offset, qiov, true, 0);
ret = bdrv_prwv(child, offset, qiov, true, 0);
if (ret < 0) {
return ret;
}
@ -2449,7 +2452,8 @@ early_out:
return ret;
}
static int coroutine_fn bdrv_co_block_status_above(BlockDriverState *bs,
static int coroutine_fn
bdrv_co_common_block_status_above(BlockDriverState *bs,
BlockDriverState *base,
bool want_zero,
int64_t offset,
@ -2494,7 +2498,7 @@ static int coroutine_fn bdrv_block_status_above_co_entry(void *opaque)
{
BdrvCoBlockStatusData *data = opaque;
return bdrv_co_block_status_above(data->bs, data->base,
return bdrv_co_common_block_status_above(data->bs, data->base,
data->want_zero,
data->offset, data->bytes,
data->pnum, data->map, data->file);