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block: Add blk_next_root_bs()

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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: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-03-16 19:54:42 +01:00 committed by Kevin Wolf
parent 262b4e8f74
commit 981f4f578e
2 changed files with 25 additions and 0 deletions
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24
block/block-backend.c
View File

@ -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.

1
include/sysemu/block-backend.h
View File

@ -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);