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authorAlberto Garcia <berto@igalia.com>2015-11-04 15:15:36 +0200
committerKevin Wolf <kwolf@redhat.com>2015-11-11 16:25:47 +0100
commita0d64a61db602696f4f1895a890c65eda5b3b618 (patch)
treea448fb1c4f0a3b60b0fb09f0bd81beab9ef748db /include
parent5ac724184c286b367525035eabf4b8bb4a386c54 (diff)
throttle: Use bs->throttle_state instead of bs->io_limits_enabled
There are two ways to check for I/O limits in a BlockDriverState: - bs->throttle_state: if this pointer is not NULL, it means that this BDS is member of a throttling group, its ThrottleTimers structure has been initialized and its I/O limits are ready to be applied. - bs->io_limits_enabled: if true it means that the throttle_state pointer is valid _and_ the limits are currently enabled. The latter is used in several places to check whether a BDS has I/O limits configured, but what it really checks is whether requests are being throttled or not. For example, io_limits_enabled can be temporarily set to false in cases like bdrv_read_unthrottled() without otherwise touching the throtting configuration of that BDS. This patch replaces bs->io_limits_enabled with bs->throttle_state in all cases where what we really want to check is the existence of I/O limits, not whether they are currently enabled or not. Signed-off-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/block/block_int.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 6a3f64da12..603145a21d 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -390,7 +390,10 @@ struct BlockDriverState {
/* number of in-flight serialising requests */
unsigned int serialising_in_flight;
- /* I/O throttling */
+ /* I/O throttling.
+ * throttle_state tells us if this BDS has I/O limits configured.
+ * io_limits_enabled tells us if they are currently being
+ * enforced, but it can be temporarily set to false */
CoQueue throttled_reqs[2];
bool io_limits_enabled;
/* The following fields are protected by the ThrottleGroup lock.