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file-win32: Switch to byte-based callbacks

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We are gradually moving away from sector-based interfaces, towards
byte-based.  Make the change for the last few sector-based callbacks
in the file-win32 driver.

Note that the driver was already using byte-based calls for
performing actual I/O, so this just gets rid of a round trip
of scaling; however, as I don't know if Windows is tolerant of
non-sector AIO operations, I went with the conservative approach
of modifying .bdrv_refresh_limits to override the block layer
defaults back to the pre-patch value of 512.

Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2018-04-24 14:25:02 -05:00 • committed by Kevin Wolf
parent e31f6864a6
commit de7056a3f9
3 changed files with 32 additions and 22 deletions
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5
block/win32-aio.c
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@ -112,15 +112,14 @@ static const AIOCBInfo win32_aiocb_info = {
BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
QEMUWin32AIOState *aio, HANDLE hfile,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
BlockCompletionFunc *cb, void *opaque, int type)
{
struct QEMUWin32AIOCB *waiocb;
uint64_t offset = sector_num * 512;
DWORD rc;
waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque);
waiocb->nbytes = nb_sectors * 512;
waiocb->nbytes = bytes;
waiocb->qiov = qiov;
waiocb->is_read = (type == QEMU_AIO_READ);