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block: introduce BDRV_REQ_MAY_UNMAP request flag

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Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2013-10-24 12:06:52 +02:00 • committed by Kevin Wolf
parent aa7bfbfff7
commit d32f35cbc5
4 changed files with 14 additions and 2 deletions
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4
block.c
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@ -2818,6 +2818,10 @@ int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs,
{
trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors);
if (!(bs->open_flags & BDRV_O_UNMAP)) {
flags &= ~BDRV_REQ_MAY_UNMAP;
}
return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL,
BDRV_REQ_ZERO_WRITE | flags);
}