diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2020-10-05 17:58:53 +0200 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2020-10-09 07:08:20 +0200 |
| commit | e336fd4c4b2fa04e5d6c7f8ee524bfd2d9e9e8f1 (patch) | |
| tree | 5e067cd1cc99e744e2eea9eac4cdb58904e564aa /include | |
| parent | 26b0b698c00bd9176f86c539aeb680481fa19473 (diff) | |
block: Add bdrv_co_enter()/leave()
Add a pair of functions to temporarily move the current coroutine to the
AioContext of a given BlockDriverState.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20201005155855.256490-13-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/block.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h index ce2ac39299..1027c58a41 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -641,6 +641,23 @@ bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); AioContext *bdrv_get_aio_context(BlockDriverState *bs); /** + * Move the current coroutine to the AioContext of @bs and return the old + * AioContext of the coroutine. Increase bs->in_flight so that draining @bs + * will wait for the operation to proceed until the corresponding + * bdrv_co_leave(). + * + * Consequently, you can't call drain inside a bdrv_co_enter/leave() section as + * this will deadlock. + */ +AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs); + +/** + * Ends a section started by bdrv_co_enter(). Move the current coroutine back + * to old_ctx and decrease bs->in_flight again. + */ +void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx); + +/** * Transfer control to @co in the aio context of @bs */ void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); |