Commit 1c89e1fa authored by Kevin Wolf's avatar Kevin Wolf
Browse files

block: Add blk_by_dev() 



This finds a BlockBackend given the device model that is attached to it.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
parent 6bed0280

block/block-backend.c

+19 −0
Original line number Diff line number Diff line
@@ -559,6 +559,25 @@ void *blk_get_attached_dev(BlockBackend *blk) 
    return blk->dev;

}



/*

 * Return the BlockBackend which has the device model @dev attached if it

 * exists, else null.

 *

 * @dev must not be null.

 */

BlockBackend *blk_by_dev(void *dev)

{

    BlockBackend *blk = NULL;



    assert(dev != NULL);

    while ((blk = blk_all_next(blk)) != NULL) {

        if (blk->dev == dev) {

            return blk;

        }

    }

    return NULL;

}



/*

 * Set @blk's device model callbacks to @ops.

 * @opaque is the opaque argument to pass to the callbacks.

include/sysemu/block-backend.h

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ int blk_attach_dev(BlockBackend *blk, void *dev); 
void blk_attach_dev_nofail(BlockBackend *blk, void *dev);

void blk_detach_dev(BlockBackend *blk, void *dev);

void *blk_get_attached_dev(BlockBackend *blk);

BlockBackend *blk_by_dev(void *dev);

void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);

int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf,

                          int count);