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block: Always set writeback mode in blk_new_open()

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All callers of blk_new_open() either don't rely on the WCE bit set after
blk_new_open() because they explicitly set it anyway, or they pass
BDRV_O_CACHE_WB unconditionally.

This patch changes blk_new_open() so that it always enables writeback
mode and asserts that BDRV_O_CACHE_WB is clear. For those callers that
used to pass BDRV_O_CACHE_WB unconditionally, the flag is removed now.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-15 14:34:37 +01:00
parent e4b24b497e
commit 72e775c7d9
12 changed files with 20 additions and 28 deletions
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4
block/block-backend.c
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@ -148,6 +148,8 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
BlockBackend *blk;
int ret;
assert((flags & BDRV_O_CACHE_WB) == 0);
blk = blk_new_with_bs(errp);
if (!blk) {
QDECREF(options);
@ -160,6 +162,8 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
return NULL;
}
blk_set_enable_write_cache(blk, true);
return blk;
}