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>

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index b35cc56..a592afc 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -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;