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[Qemu-devel] [PATCH] block-raw: Make cache=off default again
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH] block-raw: Make cache=off default again |
Date: |
Mon, 22 Jun 2009 13:18:03 +0200 |
Since the patch that suggested it woudl revert qcow2 to writeback caching, in
fact none of the drivers has had cache=off as default any more. This patch
restores the desired behaviour.
Signed-off-by: Kevin Wolf <address@hidden>
---
block/raw-posix.c | 4 ++++
block/raw-win32.c | 8 ++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index fa1a394..513e8e8 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -143,6 +143,10 @@ static int raw_open_common(BlockDriverState *bs, const
char *filename,
/* Use O_DSYNC for write-through caching, no flags for write-back caching,
* and O_DIRECT for no caching. */
+ if (bdrv_flags & BDRV_O_CACHE_DEF) {
+ bdrv_flags = (bdrv_flags & ~BDRV_O_CACHE_MASK) | BDRV_O_NOCACHE;
+ }
+
if ((bdrv_flags & BDRV_O_NOCACHE))
s->open_flags |= O_DIRECT;
else if (!(bdrv_flags & BDRV_O_CACHE_WB))
diff --git a/block/raw-win32.c b/block/raw-win32.c
index 72acad5..5da957c 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -92,6 +92,10 @@ static int raw_open(BlockDriverState *bs, const char
*filename, int flags)
create_flags = OPEN_EXISTING;
}
overlapped = FILE_ATTRIBUTE_NORMAL;
+
+ if (flags & BDRV_O_CACHE_DEF) {
+ flags = (flags & ~BDRV_O_CACHE_MASK) | BDRV_O_NOCACHE;
+ }
if ((flags & BDRV_O_NOCACHE))
overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
else if (!(flags & BDRV_O_CACHE_WB))
@@ -345,6 +349,10 @@ static int hdev_open(BlockDriverState *bs, const char
*filename, int flags)
create_flags = OPEN_EXISTING;
overlapped = FILE_ATTRIBUTE_NORMAL;
+
+ if (flags & BDRV_O_CACHE_DEF) {
+ flags = (flags & ~BDRV_O_CACHE_MASK) | BDRV_O_NOCACHE;
+ }
if ((flags & BDRV_O_NOCACHE))
overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
else if (!(flags & BDRV_O_CACHE_WB))
--
1.6.0.6
- [Qemu-devel] [PATCH] block-raw: Make cache=off default again,
Kevin Wolf <=
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Christoph Hellwig, 2009/06/22
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Kevin Wolf, 2009/06/22
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Avi Kivity, 2009/06/22
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Kevin Wolf, 2009/06/22
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Avi Kivity, 2009/06/22
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Kevin Wolf, 2009/06/22
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Jamie Lokier, 2009/06/23
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Kevin Wolf, 2009/06/23
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Jamie Lokier, 2009/06/24
- Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again, Kevin Wolf, 2009/06/25