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authorPeter Lieven <pl@kamp.de>2013-10-24 12:06:52 +0200
committerKevin Wolf <kwolf@redhat.com>2013-11-28 10:30:51 +0100
commitd32f35cbc5a87af5e1100dd55074a79fc2cb5307 (patch)
tree55fa60fcbf692789af57904cb5bc84be7b649df7 /block.c
parentaa7bfbfff792538a9eeefe879fc4c629aa0b4203 (diff)
downloadqemu-arm-d32f35cbc5a87af5e1100dd55074a79fc2cb5307.tar.gz
block: introduce BDRV_REQ_MAY_UNMAP request flag
Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block.c')
-rw-r--r--block.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block.c b/block.c
index e14ba48720..d34e974d07 100644
--- a/block.c
+++ b/block.c
@@ -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);
}