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[Qemu-block] [PATCH v4 05/15] file-posix: support BDRV_REQ_ALLOCATE
From: |
Anton Nefedov |
Subject: |
[Qemu-block] [PATCH v4 05/15] file-posix: support BDRV_REQ_ALLOCATE |
Date: |
Tue, 1 Aug 2017 17:19:02 +0300 |
Current write_zeroes implementation is good enough to satisfy this flag too
Signed-off-by: Anton Nefedov <address@hidden>
---
block/file-posix.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/block/file-posix.c b/block/file-posix.c
index 765a440..4ef1b1d 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -539,7 +539,10 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
}
if (S_ISREG(st.st_mode)) {
s->discard_zeroes = true;
+#ifdef CONFIG_FALLOCATE
s->has_fallocate = true;
+ bs->supported_zero_flags |= BDRV_REQ_ALLOCATE;
+#endif
}
if (S_ISBLK(st.st_mode)) {
#ifdef BLKDISCARDZEROES
@@ -574,6 +577,7 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
#ifdef CONFIG_XFS
if (platform_test_xfs_fd(s->fd)) {
s->is_xfs = true;
+ bs->supported_zero_flags |= BDRV_REQ_ALLOCATE;
}
#endif
@@ -1388,6 +1392,10 @@ static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData
*aiocb)
}
s->has_fallocate = false;
}
+
+ if (!s->has_fallocate) {
+ aiocb->bs->supported_zero_flags &= ~BDRV_REQ_ALLOCATE;
+ }
#endif
return -ENOTSUP;
--
2.7.4
- [Qemu-block] [PATCH v4 00/15] qcow2: space preallocation and COW improvements, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 01/15] mirror: inherit supported write/zero flags, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 08/15] qcow2: set inactive flag, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 07/15] qcow2: preallocation at image expand, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 04/15] block: treat BDRV_REQ_ALLOCATE as serialising, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 05/15] file-posix: support BDRV_REQ_ALLOCATE,
Anton Nefedov <=
- [Qemu-block] [PATCH v4 06/15] block: support BDRV_REQ_ALLOCATE in passthrough drivers, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 09/15] qcow2: truncate preallocated space, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 02/15] blkverify: set supported write/zero flags, Anton Nefedov, 2017/08/01
- [Qemu-block] [PATCH v4 03/15] block: introduce BDRV_REQ_ALLOCATE flag, Anton Nefedov, 2017/08/01