diff options
| author | Alberto Garcia <berto@igalia.com> | 2015-11-04 15:15:36 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-11-11 16:25:47 +0100 |
| commit | a0d64a61db602696f4f1895a890c65eda5b3b618 (patch) | |
| tree | a448fb1c4f0a3b60b0fb09f0bd81beab9ef748db /include/block | |
| parent | 5ac724184c286b367525035eabf4b8bb4a386c54 (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/block')
| -rw-r--r-- | include/block/block_int.h | 5 |
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. |