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[PATCH] block: unmap (discard) blocks only if discard_zeros flag is true
From: |
luzhipeng |
Subject: |
[PATCH] block: unmap (discard) blocks only if discard_zeros flag is true |
Date: |
Fri, 23 Sep 2022 18:02:24 +0800 |
From: lu zhipeng <luzhipeng@cestc.cn>
we can unmap(discard) blocks for block devices of supporting discard zeros
or regular file.
Signed-off-by: lu zhipeng <luzhipeng@cestc.cn>
---
block/file-posix.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index 48cd096624..c35dbc0d88 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -799,7 +799,8 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
#endif
s->needs_alignment = raw_needs_alignment(bs);
- bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
+ bs->supported_zero_flags = s->discard_zeroes ?
+ BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK : 0;
if (S_ISREG(st.st_mode)) {
/* When extending regular files, we get zeros from the OS */
bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
--
2.31.1
- [PATCH] block: unmap (discard) blocks only if discard_zeros flag is true,
luzhipeng <=