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block: Create bdrv_inherited_flags()

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Instead of having bdrv_open_flags() as a function that creates flags for
several unrelated places and then adding open-coded flags on top, create
a new function that derives the flags for bs->file from the flags for bs.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2014-04-11 21:29:52 +02:00
parent cffb12051a
commit 0b50cc8853
1 changed files with 26 additions and 2 deletions
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28
block.c
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@ -774,6 +774,30 @@ void bdrv_disable_copy_on_read(BlockDriverState *bs)
bs->copy_on_read--;
}
/*
* Returns the flags that bs->file should get, based on the given flags for
* the parent BDS
*/
static int bdrv_inherited_flags(int flags)
{
/* Enable protocol handling, disable format probing for bs->file */
flags |= BDRV_O_PROTOCOL;
/* Our block drivers take care to send flushes and respect unmap policy,
* so we can enable both unconditionally on lower layers. */
flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP;
/* The backing file of a temporary snapshot is read-only */
if (flags & BDRV_O_SNAPSHOT) {
flags &= ~BDRV_O_RDWR;
}
/* Clear flags that only apply to the top layer */
flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
return flags;
}
static int bdrv_open_flags(BlockDriverState *bs, int flags)
{
int open_flags = flags | BDRV_O_CACHE_WB;
@ -1333,8 +1357,8 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
assert(file == NULL);
ret = bdrv_open_image(&file, filename, options, "file",
bdrv_open_flags(bs, flags | BDRV_O_UNMAP) |
BDRV_O_PROTOCOL, true, &local_err);
bdrv_inherited_flags(flags),
true, &local_err);
if (ret < 0) {
goto unlink_and_fail;
}