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block: Factor out bdrv_open_flags 

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2012-11-12 17:05:39 +01:00
parent c57b6656c3
commit 7b27245239
1 changed files with 21 additions and 14 deletions
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35
block.c
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@ -634,6 +634,26 @@ void bdrv_disable_copy_on_read(BlockDriverState *bs)
bs->copy_on_read--;
}
static int bdrv_open_flags(BlockDriverState *bs, int flags)
{
int open_flags = flags | BDRV_O_CACHE_WB;
/*
* Clear flags that are internal to the block layer before opening the
* image.
*/
open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
/*
* Snapshots should be writable.
*/
if (bs->is_temporary) {
open_flags |= BDRV_O_RDWR;
}
return open_flags;
}
/*
* Common part for opening disk images and files
*/
@ -665,20 +685,7 @@ static int bdrv_open_common(BlockDriverState *bs, const char *filename,
bs->opaque = g_malloc0(drv->instance_size);
bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB);
open_flags = flags | BDRV_O_CACHE_WB;
/*
* Clear flags that are internal to the block layer before opening the
* image.
*/
open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
/*
* Snapshots should be writable.
*/
if (bs->is_temporary) {
open_flags |= BDRV_O_RDWR;
}
open_flags = bdrv_open_flags(bs, flags);
bs->read_only = !(open_flags & BDRV_O_RDWR);