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block: replace icq->changed with icq->flags

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icq->changed was used for ICQ_*_CHANGED bits.  Rename it to flags and
access it under ioc->lock instead of using atomic bitops.
ioc_get_changed() is added so that the changed part can be fetched and
cleared as before.

icq->flags will be used to carry other flags.

Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2012-02-15 09:45:49 +01:00 • committed by Jens Axboe
parent 7ada1dd628
commit d705ae6b13
3 changed files with 38 additions and 13 deletions
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9
include/linux/iocontext.h
View file

@ -6,8 +6,10 @@
#include <linux/workqueue.h>
enum {
ICQ_IOPRIO_CHANGED,
ICQ_CGROUP_CHANGED,
ICQ_IOPRIO_CHANGED = 1 << 0,
ICQ_CGROUP_CHANGED = 1 << 1,
ICQ_CHANGED_MASK = ICQ_IOPRIO_CHANGED | ICQ_CGROUP_CHANGED,
};
/*
@ -88,7 +90,7 @@ struct io_cq {
struct rcu_head __rcu_head;
};
unsigned long changed;
unsigned int flags;
};
/*
@ -139,6 +141,7 @@ struct io_context *get_task_io_context(struct task_struct *task,
gfp_t gfp_flags, int node);
void ioc_ioprio_changed(struct io_context *ioc, int ioprio);
void ioc_cgroup_changed(struct io_context *ioc);
unsigned int icq_get_changed(struct io_cq *icq);
#else
struct io_context;
static inline void put_io_context(struct io_context *ioc) { }