On 05/12/2014 17:15, Ming Lei wrote:
> From: Ming Lei <ming....@caonical.com>
>
> QEMU block should have supported to read/write at most
> 0x7fffff * 512 bytes, unfortunately INT_MAX is used to check
> bytes in both bdrv_co_do_writev() and bdrv_check_byte_request(),
> so cause write failure if nr_sectors is equal or more
> than 0x400000.
>
> There are still other INT_MAX usages in block.c, and they might
> need to change to UINT_MAX too in future, but at least
> this patch's change can make SCSI WRITE SAME 16 workable.
>
> Cc: qemu-sta...@nongnu.org
> Signed-off-by: Ming Lei <ming....@caonical.com>
Alternatively, I'd accept a SCSI patch setting max_ws_blocks and friends
to 2GB - 1 block.
Paolo
> ---
> block.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/block.c b/block.c
> index a612594..ddc18c2 100644
> --- a/block.c
> +++ b/block.c
> @@ -2607,7 +2607,7 @@ static int bdrv_check_byte_request(BlockDriverState
> *bs, int64_t offset,
> {
> int64_t len;
>
> - if (size > INT_MAX) {
> + if (size > UINT_MAX) {
> return -EIO;
> }
>
> @@ -3420,7 +3420,7 @@ 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)) {
> + if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) {
> return -EINVAL;
> }
>
>
