Commit 981f4f57 authored by Max Reitz's avatar Max Reitz Committed by Kevin Wolf
Browse files

block: Add blk_next_root_bs() 



This function iterates over all BDSs attached to a BB. We are going to
need it when rewriting bdrv_next() so it no longer uses bdrv_states.

Signed-off-by: default avatarMax Reitz <mreitz@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 262b4e8f

block/block-backend.c

+24 −0
Original line number Diff line number Diff line
@@ -249,6 +249,30 @@ BlockBackend *blk_next(BlockBackend *blk) 
               : QTAILQ_FIRST(&monitor_block_backends);

}



/*

 * Iterates over all BlockDriverStates which are attached to a BlockBackend.

 * This function is for use by bdrv_next().

 *

 * @bs must be NULL or a BDS that is attached to a BB.

 */

BlockDriverState *blk_next_root_bs(BlockDriverState *bs)

{

    BlockBackend *blk;



    if (bs) {

        assert(bs->blk);

        blk = bs->blk;

    } else {

        blk = NULL;

    }



    do {

        blk = blk_all_next(blk);

    } while (blk && !blk->bs);



    return blk ? blk->bs : NULL;

}



/*

 * Add a BlockBackend into the list of backends referenced by the monitor, with

 * the given @name acting as the handle for the monitor.

include/sysemu/block-backend.h

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ void blk_remove_all_bs(void); 
const char *blk_name(BlockBackend *blk);

BlockBackend *blk_by_name(const char *name);

BlockBackend *blk_next(BlockBackend *blk);

BlockDriverState *blk_next_root_bs(BlockDriverState *bs);

bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp);

void monitor_remove_blk(BlockBackend *blk);