Allow discard to fail, and fall back to the write operation. This
is needed because there's no simple way to probe for availability
of FALLOC_FL_PUNCH_HOLE.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
block.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/block.c b/block.c
index af73497..7397df6 100644
--- a/block.c
+++ b/block.c
@@ -1798,7 +1798,10 @@ static int coroutine_fn
bdrv_co_do_write_zeroes(BlockDriverState *bs,
bdi.discard_granularity &&
(sector_num & (bdi.discard_granularity - 1)) == 0 &&
(nb_sectors & (bdi.discard_granularity - 1)) == 0) {
- return bdrv_co_do_discard(bs, sector_num, nb_sectors);
+ ret = bdrv_co_do_discard(bs, sector_num, nb_sectors);
+ if (ret != -ENOTSUP) {
+ return ret;
+ }
}
if (qiov) {
--
1.7.7.6
