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block: clarify the meaning of BDRV_O_NOCACHE

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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>
This commit is contained in:
Christoph Hellwig 2011-05-17 18:04:06 +02:00 • committed by Kevin Wolf
parent 69c38b8fce
commit a659979328
7 changed files with 13 additions and 19 deletions
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2
block/raw-posix.c
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@ -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;