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block: Move throttling fields from BDS to BB

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This patch changes where the throttling state is stored (used to be the
BlockDriverState, now it is the BlockBackend), but it doesn't actually
make it a BB level feature yet. For example, throttling is still
disabled when the BDS is detached from the BB.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-21 12:56:44 +01:00
parent 49d2165d7d
commit 27ccdd5259
10 changed files with 142 additions and 118 deletions
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11
include/sysemu/block-backend.h
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@ -14,6 +14,7 @@
#define BLOCK_BACKEND_H
#include "qemu/iov.h"
#include "block/throttle-groups.h"
/*
* TODO Have to include block/block.h for a bunch of block layer
@ -63,9 +64,17 @@ typedef struct BlockDevOps {
* fields that must be public. This is in particular for QLIST_ENTRY() and
* friends so that BlockBackends can be kept in lists outside block-backend.c */
typedef struct BlockBackendPublic {
/* I/O throttling */
/* I/O throttling.
* throttle_state tells us if this BlockBackend has I/O limits configured.
* io_limits_disabled tells us if they are currently being enforced */
CoQueue throttled_reqs[2];
unsigned int io_limits_disabled;
/* The following fields are protected by the ThrottleGroup lock.
* See the ThrottleGroup documentation for details. */
ThrottleState *throttle_state;
ThrottleTimers throttle_timers;
unsigned pending_reqs[2];
QLIST_ENTRY(BlockBackendPublic) round_robin;
} BlockBackendPublic;