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Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers |
Date: |
Thu, 13 Sep 2012 18:12:58 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 |
Il 13/09/2012 17:49, Jeff Cody ha scritto:
> Block drivers should always open the files in writeback mode (see commit
> e1e9b0ac), so raw-posix/raw-win32 should not parse the BDRV_O_CACHE_WB
> flag.
>
> Signed-off-by: Jeff Cody <address@hidden>
> ---
> block/raw-posix.c | 3 ---
> block/raw-win32.c | 3 ---
> 2 files changed, 6 deletions(-)
>
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index 7d3ac9d..4a1047c 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c
> @@ -202,9 +202,6 @@ static void raw_parse_flags(int bdrv_flags, int
> *open_flags)
> if ((bdrv_flags & BDRV_O_NOCACHE)) {
> *open_flags |= O_DIRECT;
> }
> - if (!(bdrv_flags & BDRV_O_CACHE_WB)) {
> - *open_flags |= O_DSYNC;
> - }
> }
>
> static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags)
> diff --git a/block/raw-win32.c b/block/raw-win32.c
> index 335c06a..78c8306 100644
> --- a/block/raw-win32.c
> +++ b/block/raw-win32.c
> @@ -92,9 +92,6 @@ static void raw_parse_flags(int flags, int *access_flags,
> DWORD *overlapped)
> if (flags & BDRV_O_NOCACHE) {
> *overlapped |= FILE_FLAG_NO_BUFFERING;
> }
> - if (!(flags & BDRV_O_CACHE_WB)) {
> - *overlapped |= FILE_FLAG_WRITE_THROUGH;
> - }
> }
>
> static int raw_open(BlockDriverState *bs, const char *filename, int flags)
>
Why does this matter? If raw-posix was opened directly (i.e. without
the bs->file indirection) this would cause a writethrough file to be
incorrectly opened as writeback.
Paolo
- [Qemu-devel] [PATCH v2 00/16] block: bdrv_reopen() patches, Jeff Cody, 2012/09/13
- [Qemu-devel] [PATCH v2 01/16] block: correctly set the keep_read_only flag, Jeff Cody, 2012/09/13
- [Qemu-devel] [PATCH v2 02/16] block: make bdrv_set_enable_write_cache() modify open_flags, Jeff Cody, 2012/09/13
- [Qemu-devel] [PATCH v2 03/16] block: Framework for reopening files safely, Jeff Cody, 2012/09/13
- [Qemu-devel] [PATCH v2 04/16] block: move aio initialization into a helper function, Jeff Cody, 2012/09/13
- [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Jeff Cody, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Jeff Cody, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Paolo Bonzini, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Jeff Cody, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Paolo Bonzini, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Paolo Bonzini, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Jeff Cody, 2012/09/13
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Paolo Bonzini, 2012/09/14
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Kevin Wolf, 2012/09/14
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Kevin Wolf, 2012/09/14
- Re: [Qemu-devel] [PATCH v2 06/16] block: do not parse BDRV_O_CACHE_WB in raw block drivers, Paolo Bonzini, 2012/09/14