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cfq-iosched: apply bool value where we return 0/1 

Saves 16 bytes of text, woohoo. But the more important point is
that it makes the code more readable when returning bool for 0/1
cases.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2009-10-07 20:02:57 +02:00
parent ec60e4f674
commit a6151c3a5c
1 changed files with 31 additions and 37 deletions
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68
block/cfq-iosched.c
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@ -230,7 +230,7 @@ CFQ_CFQQ_FNS(coop);
blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args)
static void cfq_dispatch_insert(struct request_queue *, struct request *);
static struct cfq_queue *cfq_get_queue(struct cfq_data *, int,
static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool,
struct io_context *, gfp_t);
static struct cfq_io_context *cfq_cic_lookup(struct cfq_data *,
struct io_context *);
@ -241,27 +241,24 @@ static inline int rq_in_driver(struct cfq_data *cfqd)
}
static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_context *cic,
int is_sync)
bool is_sync)
{
return cic->cfqq[!!is_sync];
return cic->cfqq[is_sync];
}
static inline void cic_set_cfqq(struct cfq_io_context *cic,
struct cfq_queue *cfqq, int is_sync)
struct cfq_queue *cfqq, bool is_sync)
{
cic->cfqq[!!is_sync] = cfqq;
cic->cfqq[is_sync] = cfqq;
}
/*
* We regard a request as SYNC, if it's either a read or has the SYNC bit
* set (in which case it could also be direct WRITE).
*/
static inline int cfq_bio_sync(struct bio *bio)
static inline bool cfq_bio_sync(struct bio *bio)
{
if (bio_data_dir(bio) == READ || bio_rw_flagged(bio, BIO_RW_SYNCIO))
return 1;
return 0;
return bio_data_dir(bio) == READ || bio_rw_flagged(bio, BIO_RW_SYNCIO);
}
/*
@ -288,7 +285,7 @@ static int cfq_queue_empty(struct request_queue *q)
* if a queue is marked sync and has sync io queued. A sync queue with async
* io only, should not get full sync slice length.
*/
static inline int cfq_prio_slice(struct cfq_data *cfqd, int sync,
static inline int cfq_prio_slice(struct cfq_data *cfqd, bool sync,
unsigned short prio)
{
const int base_slice = cfqd->cfq_slice[sync];
@ -316,7 +313,7 @@ cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq)
* isn't valid until the first request from the dispatch is activated
* and the slice time set.
*/
static inline int cfq_slice_used(struct cfq_queue *cfqq)
static inline bool cfq_slice_used(struct cfq_queue *cfqq)
{
if (cfq_cfqq_slice_new(cfqq))
return 0;
@ -491,7 +488,7 @@ static unsigned long cfq_slice_offset(struct cfq_data *cfqd,
* we will service the queues.
*/
static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
int add_front)
bool add_front)
{
struct rb_node **p, *parent;
struct cfq_queue *__cfqq;
@ -853,7 +850,7 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
* Disallow merge of a sync bio into an async request.
*/
if (cfq_bio_sync(bio) && !rq_is_sync(rq))
return 0;
return false;
/*
* Lookup the cfqq that this bio will be queued with. Allow
@ -861,13 +858,10 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
*/
cic = cfq_cic_lookup(cfqd, current->io_context);
if (!cic)
return 0;
return false;
cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio));
if (cfqq == RQ_CFQQ(rq))
return 1;
return 0;
return cfqq == RQ_CFQQ(rq);
}
static void __cfq_set_active_queue(struct cfq_data *cfqd,
@ -895,7 +889,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
*/
static void
__cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
int timed_out)
bool timed_out)
{
cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out);
@ -923,7 +917,7 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
}
static inline void cfq_slice_expired(struct cfq_data *cfqd, int timed_out)
static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out)
{
struct cfq_queue *cfqq = cfqd->active_queue;
@ -1035,7 +1029,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
*/
static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
struct cfq_queue *cur_cfqq,
int probe)
bool probe)
{
struct cfq_queue *cfqq;
@ -1676,7 +1670,7 @@ static void cfq_ioc_set_ioprio(struct io_context *ioc)
}
static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq,
pid_t pid, int is_sync)
pid_t pid, bool is_sync)
{
RB_CLEAR_NODE(&cfqq->rb_node);
RB_CLEAR_NODE(&cfqq->p_node);
@ -1696,7 +1690,7 @@ static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
static struct cfq_queue *
cfq_find_alloc_queue(struct cfq_data *cfqd, int is_sync,
cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,
struct io_context *ioc, gfp_t gfp_mask)
{
struct cfq_queue *cfqq, *new_cfqq = NULL;
@ -1760,7 +1754,7 @@ cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio)
}
static struct cfq_queue *
cfq_get_queue(struct cfq_data *cfqd, int is_sync, struct io_context *ioc,
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
gfp_t gfp_mask)
{
const int ioprio = task_ioprio(ioc);
@ -2017,7 +2011,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* Check if new_cfqq should preempt the currently active queue. Return 0 for
* no or if we aren't sure, a 1 will cause a preempt.
*/
static int
static bool
cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
struct request *rq)
{
@ -2025,48 +2019,48 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
cfqq = cfqd->active_queue;
if (!cfqq)
return 0;
return false;
if (cfq_slice_used(cfqq))
return 1;
return true;
if (cfq_class_idle(new_cfqq))
return 0;
return false;
if (cfq_class_idle(cfqq))
return 1;
return true;
/*
* if the new request is sync, but the currently running queue is
* not, let the sync request have priority.
*/
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq))
return 1;
return true;
/*
* So both queues are sync. Let the new request get disk time if
* it's a metadata request and the current queue is doing regular IO.
*/
if (rq_is_meta(rq) && !cfqq->meta_pending)
return 1;
return false;
/*
* Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice.
*/
if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq))
return 1;
return true;
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq))
return 0;
return false;
/*
* if this request is as-good as one we would expect from the
* current cfqq, let it preempt
*/
if (cfq_rq_close(cfqd, rq))
return 1;
return true;
return 0;
return false;
}
/*
@ -2331,7 +2325,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask)
struct cfq_data *cfqd = q->elevator->elevator_data;
struct cfq_io_context *cic;
const int rw = rq_data_dir(rq);
const int is_sync = rq_is_sync(rq);
const bool is_sync = rq_is_sync(rq);
struct cfq_queue *cfqq;
unsigned long flags;