Current write_zeroes implementation is good enough to satisfy this flag too
Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com>
---
block/file-posix.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index cfbb236..bd52b31 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -527,7 +527,6 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
s->has_discard = true;
s->has_write_zeroes = true;
- bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
if ((bs->open_flags & BDRV_O_NOCACHE) != 0) {
s->needs_alignment = true;
}
@@ -577,6 +576,11 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
}
#endif
+ bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
+ if (s->has_write_zeroes || s->has_fallocate) {
+ bs->supported_zero_flags |= BDRV_REQ_ALLOCATE;
+ }
+
ret = 0;
fail:
if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
@@ -1390,6 +1394,9 @@ static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData
*aiocb)
}
#endif
+ if (!s->has_fallocate) {
+ aiocb->bs->supported_zero_flags &= ~BDRV_REQ_ALLOCATE;
+ }
return -ENOTSUP;
}
--
2.7.4
