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block-backend: add drained_begin / drained_end ops

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Allow block backends to forward drain requests to their devices/users.
The initial intended purpose for this patch is to allow BBs to forward
requests along to BlockJobs, which will want to pause if their associated
BB has entered a drained region.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-id: 20170316212351.13797-3-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
John Snow 2017-03-16 17:23:50 -04:00 • committed by Jeff Cody
parent e3796a245a
commit f4d9cc88ee
2 changed files with 30 additions and 2 deletions
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8
include/sysemu/block-backend.h
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@ -58,6 +58,14 @@ typedef struct BlockDevOps {
* Runs when the size changed (e.g. monitor command block_resize)
*/
void (*resize_cb)(void *opaque);
/*
* Runs when the backend receives a drain request.
*/
void (*drained_begin)(void *opaque);
/*
* Runs when the backend's last drain request ends.
*/
void (*drained_end)(void *opaque);
} BlockDevOps;
/* This struct is embedded in (the private) BlockBackend struct and contains