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block: Introduce bdrv_driver_pwritev()

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This is a function that simply calls into the block driver for doing a
write, providing the byte granularity interface we want to eventually
have everywhere, and using whatever interface that driver supports.

This one is a bit more interesting than the version for reads: It adds
support for .bdrv_co_writev_flags() everywhere, so that drivers
implementing this function can drop .bdrv_co_writev() now.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-04-25 12:13:39 +02:00
parent 166fe96051
commit 78a07294d5
4 changed files with 36 additions and 40 deletions
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8
block/iscsi.c
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@ -513,13 +513,6 @@ retry:
return 0;
}
static int coroutine_fn
iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
QEMUIOVector *iov)
{
return iscsi_co_writev_flags(bs, sector_num, nb_sectors, iov, 0);
}
static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun,
int64_t sector_num, int nb_sectors)
@ -1847,7 +1840,6 @@ static BlockDriver bdrv_iscsi = {
.bdrv_co_discard = iscsi_co_discard,
.bdrv_co_write_zeroes = iscsi_co_write_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev = iscsi_co_writev,
.bdrv_co_writev_flags = iscsi_co_writev_flags,
.supported_write_flags = BDRV_REQ_FUA,
.bdrv_co_flush_to_disk = iscsi_co_flush,