diff options
| author | Sergio Lopez <slp@redhat.com> | 2021-06-02 08:05:51 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2021-06-02 14:23:20 +0200 |
| commit | 095cc4d0f62513d75e9bc1da37f08d9e97f267c4 (patch) | |
| tree | 7e274b2a5d0feb2059bac2b94ef534f1b77a6af1 | |
| parent | 30ebb9aa9203b5051c5c4f4e2421803b94e5f2cc (diff) | |
block-backend: add drained_poll
Allow block backends to poll their devices/users to check if they have
been quiesced when entering a drained section.
This will be used in the next patch to wait for the NBD server to be
completely quiesced.
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20210602060552.17433-2-slp@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/block-backend.c | 7 | ||||
| -rw-r--r-- | include/sysemu/block-backend.h | 4 |
2 files changed, 10 insertions, 1 deletions
diff --git a/block/block-backend.c b/block/block-backend.c index 5be32c0c42..15f1ea4288 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -2386,8 +2386,13 @@ static void blk_root_drained_begin(BdrvChild *child) static bool blk_root_drained_poll(BdrvChild *child) { BlockBackend *blk = child->opaque; + bool busy = false; assert(blk->quiesce_counter); - return !!blk->in_flight; + + if (blk->dev_ops && blk->dev_ops->drained_poll) { + busy = blk->dev_ops->drained_poll(blk->dev_opaque); + } + return busy || !!blk->in_flight; } static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter) diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index 880e903293..5423e3d9c6 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -66,6 +66,10 @@ typedef struct BlockDevOps { * Runs when the backend's last drain request ends. */ void (*drained_end)(void *opaque); + /* + * Is the device still busy? + */ + bool (*drained_poll)(void *opaque); } BlockDevOps; /* This struct is embedded in (the private) BlockBackend struct and contains |