diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/block.c b/block.c index 415ae3d619..40c5e1aa73 100644 --- a/block.c +++ b/block.c @@ -3289,6 +3289,15 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); + if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && + !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && + qemu_iovec_is_zero(qiov)) { + flags |= BDRV_REQ_ZERO_WRITE; + if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { + flags |= BDRV_REQ_MAY_UNMAP; + } + } + if (ret < 0) { /* Do nothing, write notifier decided to fail this request */ } else if (flags & BDRV_REQ_ZERO_WRITE) { |