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 <kw...@redhat.com>
---
block.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/block.c b/block.c
index fe55217..328f592 100644
--- a/block.c
+++ b/block.c
@@ -3016,8 +3016,8 @@ 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;
@@ -3028,21 +3028,33 @@ 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)
{
--
1.8.1.4
