Commit e1e9b0ac authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Kevin Wolf
Browse files

block: always open drivers in writeback mode 



Formats are entirely in charge of flushes for metadata writes.  For
guest-initiated writes, a writethrough cache is faked in the block layer.
So we can always open in writeback mode.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 425b0148

block.c

+2 −1
Original line number Diff line number Diff line
@@ -649,12 +649,13 @@ 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 = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);

    open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);



    /*

     * Snapshots should be writable.