Commit 16a389dc authored by Kevin Wolf's avatar Kevin Wolf
Browse files

block: Introduce .bdrv_co_ioctl() driver callback 



This allows drivers to implement ioctls in a coroutine-based way.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
parent 61b24504

block/io.c

+10 −6
Original line number Diff line number Diff line
@@ -2502,17 +2502,21 @@ int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf) 
    BlockAIOCB *acb;



    tracked_request_begin(&tracked_req, bs, 0, 0, BDRV_TRACKED_IOCTL);

    if (!drv || !drv->bdrv_aio_ioctl) {

    if (!drv || (!drv->bdrv_aio_ioctl && !drv->bdrv_co_ioctl)) {

        co.ret = -ENOTSUP;

        goto out;

    }



    if (drv->bdrv_co_ioctl) {

        co.ret = drv->bdrv_co_ioctl(bs, req, buf);

    } else {

        acb = drv->bdrv_aio_ioctl(bs, req, buf, bdrv_co_io_em_complete, &co);

        if (!acb) {

            co.ret = -ENOTSUP;

            goto out;

        }

        qemu_coroutine_yield();

    }

out:

    tracked_request_end(&tracked_req);

    return co.ret;

include/block/block_int.h

+2 −0
Original line number Diff line number Diff line
@@ -244,6 +244,8 @@ struct BlockDriver { 
    BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,

        unsigned long int req, void *buf,

        BlockCompletionFunc *cb, void *opaque);

    int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs,

                                      unsigned long int req, void *buf);



    /* List of options for creating images, terminated by name == NULL */

    QemuOptsList *create_opts;