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[PATCH 1/2] block-backend: add drained_poll
From: |
Sergio Lopez |
Subject: |
[PATCH 1/2] block-backend: add drained_poll |
Date: |
Tue, 1 Jun 2021 07:57:27 +0200 |
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>
Signed-off-by: Sergio Lopez <slp@redhat.com>
---
block/block-backend.c | 7 ++++++-
include/sysemu/block-backend.h | 4 ++++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index de5496af66..163ca05b97 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -2393,8 +2393,13 @@ static void blk_root_drained_begin(BdrvChild *child)
static bool blk_root_drained_poll(BdrvChild *child)
{
BlockBackend *blk = child->opaque;
+ int ret = 0;
assert(blk->quiesce_counter);
- return !!blk->in_flight;
+
+ if (blk->dev_ops && blk->dev_ops->drained_poll) {
+ ret = blk->dev_ops->drained_poll(blk->dev_opaque);
+ }
+ return ret || !!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..9992072e18 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 drained?
+ */
+ bool (*drained_poll)(void *opaque);
} BlockDevOps;
/* This struct is embedded in (the private) BlockBackend struct and contains
--
2.26.2