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block: Introduce .bdrv_co_ioctl() driver callback

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

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2016-10-20 15:07:27 +02:00
parent 61b2450414
commit 16a389dc9e
2 changed files with 12 additions and 6 deletions
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16
block/io.c
View File

@ -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;
}
acb = drv->bdrv_aio_ioctl(bs, req, buf, bdrv_co_io_em_complete, &co);
if (!acb) {
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();
}
qemu_coroutine_yield();
out:
tracked_request_end(&tracked_req);
return co.ret;

2
include/block/block_int.h
View File

@ -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;