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[Qemu-devel] [PATCH v7 5/9] file-posix: support BDRV_REQ_ALLOCATE
From: |
Anton Nefedov |
Subject: |
[Qemu-devel] [PATCH v7 5/9] file-posix: support BDRV_REQ_ALLOCATE |
Date: |
Thu, 18 Jan 2018 20:49:03 +0300 |
Current write_zeroes implementation is good enough to satisfy this flag too
Signed-off-by: Anton Nefedov <address@hidden>
Reviewed-by: Alberto Garcia <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 36ee89e..c36e156 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -558,7 +558,10 @@ 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
@@ -593,6 +596,7 @@ 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
@@ -1413,6 +1417,10 @@ 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-devel] [PATCH v7 0/9] qcow2: cluster space preallocation, Anton Nefedov, 2018/01/18
- [Qemu-devel] [PATCH v7 6/9] block: support BDRV_REQ_ALLOCATE in passthrough drivers, Anton Nefedov, 2018/01/18
- [Qemu-devel] [PATCH v7 5/9] file-posix: support BDRV_REQ_ALLOCATE,
Anton Nefedov <=
- [Qemu-devel] [PATCH v7 2/9] blkverify: set supported write/zero flags, Anton Nefedov, 2018/01/18
- [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Anton Nefedov, 2018/01/18
- Re: [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Max Reitz, 2018/01/29
- Re: [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Anton Nefedov, 2018/01/30
- Re: [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Max Reitz, 2018/01/31
- Re: [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Eric Blake, 2018/01/31
- Re: [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Max Reitz, 2018/01/31
- Re: [Qemu-devel] [PATCH v7 8/9] qcow2: skip writing zero buffers to empty COW areas, Eric Blake, 2018/01/31