diff options
| author | Christoph Hellwig <hch@lst.de> | 2011-05-17 18:04:06 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-06-08 10:39:32 +0200 |
| commit | a659979328fb6d4d6100d398f5bd9a2310c3e169 (patch) | |
| tree | 8d465d20ea1efc82134941d9a589c4b224ce4b3b /block | |
| parent | 69c38b8fcec823da05f98f6ea98ec2b0013d64e2 (diff) | |
| download | qemu-a659979328fb6d4d6100d398f5bd9a2310c3e169.zip qemu-a659979328fb6d4d6100d398f5bd9a2310c3e169.tar.gz qemu-a659979328fb6d4d6100d398f5bd9a2310c3e169.tar.bz2 | |
block: clarify the meaning of BDRV_O_NOCACHE
Change BDRV_O_NOCACHE to only imply bypassing the host OS file cache,
but no writeback semantics. All existing callers are changed to also
specify BDRV_O_CACHE_WB to give them writeback semantics.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2.c | 2 | ||||
| -rw-r--r-- | block/raw-posix.c | 2 | ||||
| -rw-r--r-- | block/raw-win32.c | 12 |
3 files changed, 8 insertions, 8 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 75b8bec..db1931b 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -229,7 +229,7 @@ static int qcow2_open(BlockDriverState *bs, int flags) } /* alloc L2 table/refcount block cache */ - writethrough = ((flags & BDRV_O_CACHE_MASK) == 0); + writethrough = ((flags & BDRV_O_CACHE_WB) == 0); s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE, writethrough); s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE, writethrough); diff --git a/block/raw-posix.c b/block/raw-posix.c index 6b72470..50428fd 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -154,7 +154,7 @@ static int raw_open_common(BlockDriverState *bs, const char *filename, * and O_DIRECT for no caching. */ if ((bdrv_flags & BDRV_O_NOCACHE)) s->open_flags |= O_DIRECT; - else if (!(bdrv_flags & BDRV_O_CACHE_WB)) + if (!(bdrv_flags & BDRV_O_CACHE_WB)) s->open_flags |= O_DSYNC; s->fd = -1; diff --git a/block/raw-win32.c b/block/raw-win32.c index c204a80..56bd719 100644 --- a/block/raw-win32.c +++ b/block/raw-win32.c @@ -88,9 +88,9 @@ static int raw_open(BlockDriverState *bs, const char *filename, int flags) } overlapped = FILE_ATTRIBUTE_NORMAL; - if ((flags & BDRV_O_NOCACHE)) - overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH; - else if (!(flags & BDRV_O_CACHE_WB)) + if (flags & BDRV_O_NOCACHE) + overlapped |= FILE_FLAG_NO_BUFFERING; + if (!(flags & BDRV_O_CACHE_WB)) overlapped |= FILE_FLAG_WRITE_THROUGH; s->hfile = CreateFile(filename, access_flags, FILE_SHARE_READ, NULL, @@ -349,9 +349,9 @@ static int hdev_open(BlockDriverState *bs, const char *filename, int flags) create_flags = OPEN_EXISTING; overlapped = FILE_ATTRIBUTE_NORMAL; - if ((flags & BDRV_O_NOCACHE)) - overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH; - else if (!(flags & BDRV_O_CACHE_WB)) + if (flags & BDRV_O_NOCACHE) + overlapped |= FILE_FLAG_NO_BUFFERING; + if (!(flags & BDRV_O_CACHE_WB)) overlapped |= FILE_FLAG_WRITE_THROUGH; s->hfile = CreateFile(filename, access_flags, FILE_SHARE_READ, NULL, |