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block: Introduce bdrv_co_do_pwritev()

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This is going to become the bdrv_co_do_preadv() equivalent for writes.
In this patch, however, just a function taking byte offsets is created,
it doesn't align anything yet.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
This commit is contained in:
Kevin Wolf 2013-12-03 14:40:18 +01:00
parent 244eadef5c
commit 6601553e27
1 changed files with 18 additions and 6 deletions
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24
block.c
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@ -3196,8 +3196,8 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
/*
* Handle a write request in coroutine context
*/
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags)
{
int ret;
@ -3208,21 +3208,33 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
if (bs->read_only) {
return -EACCES;
}
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
if (bdrv_check_byte_request(bs, offset, bytes)) {
return -EIO;
}
/* throttling disk I/O */
if (bs->io_limits_enabled) {
bdrv_io_limits_intercept(bs, nb_sectors, true);
/* TODO Switch to byte granularity */
bdrv_io_limits_intercept(bs, bytes >> BDRV_SECTOR_BITS, true);
}
ret = bdrv_aligned_pwritev(bs, sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
ret = bdrv_aligned_pwritev(bs, offset, bytes, qiov, flags);
return ret;
}
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
BdrvRequestFlags flags)
{
if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) {
return -EINVAL;
}
return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
}
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{