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as-iosched: get rid of private REQ_SYNC/REQ_ASYNC defines 

We can just use the block layer BLK_RW_SYNC/ASYNC defines now.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2009-04-08 11:02:08 +02:00
parent ff6657c6c8
commit 1d6bfbdf38
1 changed files with 57 additions and 59 deletions
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116
block/as-iosched.c
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@ -17,9 +17,6 @@
#include <linux/rbtree.h> #include <linux/rbtree.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#define REQ_SYNC 1
#define REQ_ASYNC 0
/* /*
* See Documentation/block/as-iosched.txt * See Documentation/block/as-iosched.txt
*/ */
@ -93,7 +90,7 @@ struct as_data {
struct list_head fifo_list[2]; struct list_head fifo_list[2];
struct request *next_rq[2]; /* next in sort order */ struct request *next_rq[2]; /* next in sort order */
sector_t last_sector[2]; /* last REQ_SYNC & REQ_ASYNC sectors */ sector_t last_sector[2]; /* last SYNC & ASYNC sectors */
unsigned long exit_prob; /* probability a task will exit while unsigned long exit_prob; /* probability a task will exit while
being waited on */ being waited on */
@ -109,7 +106,7 @@ struct as_data {
unsigned long last_check_fifo[2]; unsigned long last_check_fifo[2];
int changed_batch; /* 1: waiting for old batch to end */ int changed_batch; /* 1: waiting for old batch to end */
int new_batch; /* 1: waiting on first read complete */ int new_batch; /* 1: waiting on first read complete */
int batch_data_dir; /* current batch REQ_SYNC / REQ_ASYNC */ int batch_data_dir; /* current batch SYNC / ASYNC */
int write_batch_count; /* max # of reqs in a write batch */ int write_batch_count; /* max # of reqs in a write batch */
int current_write_count; /* how many requests left this batch */ int current_write_count; /* how many requests left this batch */
int write_batch_idled; /* has the write batch gone idle? */ int write_batch_idled; /* has the write batch gone idle? */
@ -554,7 +551,7 @@ static void as_update_iohist(struct as_data *ad, struct as_io_context *aic,
if (aic == NULL) if (aic == NULL)
return; return;
if (data_dir == REQ_SYNC) { if (data_dir == BLK_RW_SYNC) {
unsigned long in_flight = atomic_read(&aic->nr_queued) unsigned long in_flight = atomic_read(&aic->nr_queued)
+ atomic_read(&aic->nr_dispatched); + atomic_read(&aic->nr_dispatched);
spin_lock(&aic->lock); spin_lock(&aic->lock);
@ -811,7 +808,7 @@ static void as_update_rq(struct as_data *ad, struct request *rq)
*/ */
static void update_write_batch(struct as_data *ad) static void update_write_batch(struct as_data *ad)
{ {
unsigned long batch = ad->batch_expire[REQ_ASYNC]; unsigned long batch = ad->batch_expire[BLK_RW_ASYNC];
long write_time; long write_time;
write_time = (jiffies - ad->current_batch_expires) + batch; write_time = (jiffies - ad->current_batch_expires) + batch;
@ -855,7 +852,7 @@ static void as_completed_request(struct request_queue *q, struct request *rq)
kblockd_schedule_work(q, &ad->antic_work); kblockd_schedule_work(q, &ad->antic_work);
ad->changed_batch = 0; ad->changed_batch = 0;
if (ad->batch_data_dir == REQ_SYNC) if (ad->batch_data_dir == BLK_RW_SYNC)
ad->new_batch = 1; ad->new_batch = 1;
} }
WARN_ON(ad->nr_dispatched == 0); WARN_ON(ad->nr_dispatched == 0);
@ -869,7 +866,7 @@ static void as_completed_request(struct request_queue *q, struct request *rq)
if (ad->new_batch && ad->batch_data_dir == rq_is_sync(rq)) { if (ad->new_batch && ad->batch_data_dir == rq_is_sync(rq)) {
update_write_batch(ad); update_write_batch(ad);
ad->current_batch_expires = jiffies + ad->current_batch_expires = jiffies +
ad->batch_expire[REQ_SYNC]; ad->batch_expire[BLK_RW_SYNC];
ad->new_batch = 0; ad->new_batch = 0;
} }
@ -960,7 +957,7 @@ static inline int as_batch_expired(struct as_data *ad)
if (ad->changed_batch || ad->new_batch) if (ad->changed_batch || ad->new_batch)
return 0; return 0;
if (ad->batch_data_dir == REQ_SYNC) if (ad->batch_data_dir == BLK_RW_SYNC)
/* TODO! add a check so a complete fifo gets written? */ /* TODO! add a check so a complete fifo gets written? */
return time_after(jiffies, ad->current_batch_expires); return time_after(jiffies, ad->current_batch_expires);
@ -986,7 +983,7 @@ static void as_move_to_dispatch(struct as_data *ad, struct request *rq)
*/ */
ad->last_sector[data_dir] = rq->sector + rq->nr_sectors; ad->last_sector[data_dir] = rq->sector + rq->nr_sectors;
if (data_dir == REQ_SYNC) { if (data_dir == BLK_RW_SYNC) {
struct io_context *ioc = RQ_IOC(rq); struct io_context *ioc = RQ_IOC(rq);
/* In case we have to anticipate after this */ /* In case we have to anticipate after this */
copy_io_context(&ad->io_context, &ioc); copy_io_context(&ad->io_context, &ioc);
@ -1025,41 +1022,41 @@ static void as_move_to_dispatch(struct as_data *ad, struct request *rq)
static int as_dispatch_request(struct request_queue *q, int force) static int as_dispatch_request(struct request_queue *q, int force)
{ {
struct as_data *ad = q->elevator->elevator_data; struct as_data *ad = q->elevator->elevator_data;
const int reads = !list_empty(&ad->fifo_list[REQ_SYNC]); const int reads = !list_empty(&ad->fifo_list[BLK_RW_SYNC]);
const int writes = !list_empty(&ad->fifo_list[REQ_ASYNC]); const int writes = !list_empty(&ad->fifo_list[BLK_RW_ASYNC]);
struct request *rq; struct request *rq;
if (unlikely(force)) { if (unlikely(force)) {
/* /*
* Forced dispatch, accounting is useless. Reset * Forced dispatch, accounting is useless. Reset
* accounting states and dump fifo_lists. Note that * accounting states and dump fifo_lists. Note that
* batch_data_dir is reset to REQ_SYNC to avoid * batch_data_dir is reset to BLK_RW_SYNC to avoid
* screwing write batch accounting as write batch * screwing write batch accounting as write batch
* accounting occurs on W->R transition. * accounting occurs on W->R transition.
*/ */
int dispatched = 0; int dispatched = 0;
ad->batch_data_dir = REQ_SYNC; ad->batch_data_dir = BLK_RW_SYNC;
ad->changed_batch = 0; ad->changed_batch = 0;
ad->new_batch = 0; ad->new_batch = 0;
while (ad->next_rq[REQ_SYNC]) { while (ad->next_rq[BLK_RW_SYNC]) {
as_move_to_dispatch(ad, ad->next_rq[REQ_SYNC]); as_move_to_dispatch(ad, ad->next_rq[BLK_RW_SYNC]);
dispatched++; dispatched++;
} }
ad->last_check_fifo[REQ_SYNC] = jiffies; ad->last_check_fifo[BLK_RW_SYNC] = jiffies;
while (ad->next_rq[REQ_ASYNC]) { while (ad->next_rq[BLK_RW_ASYNC]) {
as_move_to_dispatch(ad, ad->next_rq[REQ_ASYNC]); as_move_to_dispatch(ad, ad->next_rq[BLK_RW_ASYNC]);
dispatched++; dispatched++;
} }
ad->last_check_fifo[REQ_ASYNC] = jiffies; ad->last_check_fifo[BLK_RW_ASYNC] = jiffies;
return dispatched; return dispatched;
} }
/* Signal that the write batch was uncontended, so we can't time it */ /* Signal that the write batch was uncontended, so we can't time it */
if (ad->batch_data_dir == REQ_ASYNC && !reads) { if (ad->batch_data_dir == BLK_RW_ASYNC && !reads) {
if (ad->current_write_count == 0 || !writes) if (ad->current_write_count == 0 || !writes)
ad->write_batch_idled = 1; ad->write_batch_idled = 1;
} }
@ -1076,8 +1073,8 @@ static int as_dispatch_request(struct request_queue *q, int force)
*/ */
rq = ad->next_rq[ad->batch_data_dir]; rq = ad->next_rq[ad->batch_data_dir];
if (ad->batch_data_dir == REQ_SYNC && ad->antic_expire) { if (ad->batch_data_dir == BLK_RW_SYNC && ad->antic_expire) {
if (as_fifo_expired(ad, REQ_SYNC)) if (as_fifo_expired(ad, BLK_RW_SYNC))
goto fifo_expired; goto fifo_expired;
if (as_can_anticipate(ad, rq)) { if (as_can_anticipate(ad, rq)) {
@ -1090,7 +1087,7 @@ static int as_dispatch_request(struct request_queue *q, int force)
/* we have a "next request" */ /* we have a "next request" */
if (reads && !writes) if (reads && !writes)
ad->current_batch_expires = ad->current_batch_expires =
jiffies + ad->batch_expire[REQ_SYNC]; jiffies + ad->batch_expire[BLK_RW_SYNC];
goto dispatch_request; goto dispatch_request;
} }
} }
@ -1101,20 +1098,20 @@ static int as_dispatch_request(struct request_queue *q, int force)
*/ */
if (reads) { if (reads) {
BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_SYNC])); BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[BLK_RW_SYNC]));
if (writes && ad->batch_data_dir == REQ_SYNC) if (writes && ad->batch_data_dir == BLK_RW_SYNC)
/* /*
* Last batch was a read, switch to writes * Last batch was a read, switch to writes
*/ */
goto dispatch_writes; goto dispatch_writes;
if (ad->batch_data_dir == REQ_ASYNC) { if (ad->batch_data_dir == BLK_RW_ASYNC) {
WARN_ON(ad->new_batch); WARN_ON(ad->new_batch);
ad->changed_batch = 1; ad->changed_batch = 1;
} }
ad->batch_data_dir = REQ_SYNC; ad->batch_data_dir = BLK_RW_SYNC;
rq = rq_entry_fifo(ad->fifo_list[REQ_SYNC].next); rq = rq_entry_fifo(ad->fifo_list[BLK_RW_SYNC].next);
ad->last_check_fifo[ad->batch_data_dir] = jiffies; ad->last_check_fifo[ad->batch_data_dir] = jiffies;
goto dispatch_request; goto dispatch_request;
} }
@ -1125,9 +1122,9 @@ static int as_dispatch_request(struct request_queue *q, int force)
if (writes) { if (writes) {
dispatch_writes: dispatch_writes:
BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_ASYNC])); BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[BLK_RW_ASYNC]));
if (ad->batch_data_dir == REQ_SYNC) { if (ad->batch_data_dir == BLK_RW_SYNC) {
ad->changed_batch = 1; ad->changed_batch = 1;
/* /*
@ -1137,11 +1134,11 @@ dispatch_writes:
*/ */
ad->new_batch = 0; ad->new_batch = 0;
} }
ad->batch_data_dir = REQ_ASYNC; ad->batch_data_dir = BLK_RW_ASYNC;
ad->current_write_count = ad->write_batch_count; ad->current_write_count = ad->write_batch_count;
ad->write_batch_idled = 0; ad->write_batch_idled = 0;
rq = rq_entry_fifo(ad->fifo_list[REQ_ASYNC].next); rq = rq_entry_fifo(ad->fifo_list[BLK_RW_ASYNC].next);
ad->last_check_fifo[REQ_ASYNC] = jiffies; ad->last_check_fifo[BLK_RW_ASYNC] = jiffies;
goto dispatch_request; goto dispatch_request;
} }
@ -1164,9 +1161,9 @@ fifo_expired:
if (ad->nr_dispatched) if (ad->nr_dispatched)
return 0; return 0;
if (ad->batch_data_dir == REQ_ASYNC) if (ad->batch_data_dir == BLK_RW_ASYNC)
ad->current_batch_expires = jiffies + ad->current_batch_expires = jiffies +
ad->batch_expire[REQ_ASYNC]; ad->batch_expire[BLK_RW_ASYNC];
else else
ad->new_batch = 1; ad->new_batch = 1;
@ -1238,8 +1235,8 @@ static int as_queue_empty(struct request_queue *q)
{ {
struct as_data *ad = q->elevator->elevator_data; struct as_data *ad = q->elevator->elevator_data;
return list_empty(&ad->fifo_list[REQ_ASYNC]) return list_empty(&ad->fifo_list[BLK_RW_ASYNC])
&& list_empty(&ad->fifo_list[REQ_SYNC]); && list_empty(&ad->fifo_list[BLK_RW_SYNC]);
} }
static int static int
@ -1346,8 +1343,8 @@ static void as_exit_queue(struct elevator_queue *e)
del_timer_sync(&ad->antic_timer); del_timer_sync(&ad->antic_timer);
cancel_work_sync(&ad->antic_work); cancel_work_sync(&ad->antic_work);
BUG_ON(!list_empty(&ad->fifo_list[REQ_SYNC])); BUG_ON(!list_empty(&ad->fifo_list[BLK_RW_SYNC]));
BUG_ON(!list_empty(&ad->fifo_list[REQ_ASYNC])); BUG_ON(!list_empty(&ad->fifo_list[BLK_RW_ASYNC]));
put_io_context(ad->io_context); put_io_context(ad->io_context);
kfree(ad); kfree(ad);
@ -1372,18 +1369,18 @@ static void *as_init_queue(struct request_queue *q)
init_timer(&ad->antic_timer); init_timer(&ad->antic_timer);
INIT_WORK(&ad->antic_work, as_work_handler); INIT_WORK(&ad->antic_work, as_work_handler);
INIT_LIST_HEAD(&ad->fifo_list[REQ_SYNC]); INIT_LIST_HEAD(&ad->fifo_list[BLK_RW_SYNC]);
INIT_LIST_HEAD(&ad->fifo_list[REQ_ASYNC]); INIT_LIST_HEAD(&ad->fifo_list[BLK_RW_ASYNC]);
ad->sort_list[REQ_SYNC] = RB_ROOT; ad->sort_list[BLK_RW_SYNC] = RB_ROOT;
ad->sort_list[REQ_ASYNC] = RB_ROOT; ad->sort_list[BLK_RW_ASYNC] = RB_ROOT;
ad->fifo_expire[REQ_SYNC] = default_read_expire; ad->fifo_expire[BLK_RW_SYNC] = default_read_expire;
ad->fifo_expire[REQ_ASYNC] = default_write_expire; ad->fifo_expire[BLK_RW_ASYNC] = default_write_expire;
ad->antic_expire = default_antic_expire; ad->antic_expire = default_antic_expire;
ad->batch_expire[REQ_SYNC] = default_read_batch_expire; ad->batch_expire[BLK_RW_SYNC] = default_read_batch_expire;
ad->batch_expire[REQ_ASYNC] = default_write_batch_expire; ad->batch_expire[BLK_RW_ASYNC] = default_write_batch_expire;
ad->current_batch_expires = jiffies + ad->batch_expire[REQ_SYNC]; ad->current_batch_expires = jiffies + ad->batch_expire[BLK_RW_SYNC];
ad->write_batch_count = ad->batch_expire[REQ_ASYNC] / 10; ad->write_batch_count = ad->batch_expire[BLK_RW_ASYNC] / 10;
if (ad->write_batch_count < 2) if (ad->write_batch_count < 2)
ad->write_batch_count = 2; ad->write_batch_count = 2;
@ -1432,11 +1429,11 @@ static ssize_t __FUNC(struct elevator_queue *e, char *page) \
struct as_data *ad = e->elevator_data; \ struct as_data *ad = e->elevator_data; \
return as_var_show(jiffies_to_msecs((__VAR)), (page)); \ return as_var_show(jiffies_to_msecs((__VAR)), (page)); \
} }
SHOW_FUNCTION(as_read_expire_show, ad->fifo_expire[REQ_SYNC]); SHOW_FUNCTION(as_read_expire_show, ad->fifo_expire[BLK_RW_SYNC]);
SHOW_FUNCTION(as_write_expire_show, ad->fifo_expire[REQ_ASYNC]); SHOW_FUNCTION(as_write_expire_show, ad->fifo_expire[BLK_RW_ASYNC]);
SHOW_FUNCTION(as_antic_expire_show, ad->antic_expire); SHOW_FUNCTION(as_antic_expire_show, ad->antic_expire);
SHOW_FUNCTION(as_read_batch_expire_show, ad->batch_expire[REQ_SYNC]); SHOW_FUNCTION(as_read_batch_expire_show, ad->batch_expire[BLK_RW_SYNC]);
SHOW_FUNCTION(as_write_batch_expire_show, ad->batch_expire[REQ_ASYNC]); SHOW_FUNCTION(as_write_batch_expire_show, ad->batch_expire[BLK_RW_ASYNC]);
#undef SHOW_FUNCTION #undef SHOW_FUNCTION
#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \ #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \
@ -1451,13 +1448,14 @@ static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count)
*(__PTR) = msecs_to_jiffies(*(__PTR)); \ *(__PTR) = msecs_to_jiffies(*(__PTR)); \
return ret; \ return ret; \
} }
STORE_FUNCTION(as_read_expire_store, &ad->fifo_expire[REQ_SYNC], 0, INT_MAX); STORE_FUNCTION(as_read_expire_store, &ad->fifo_expire[BLK_RW_SYNC], 0, INT_MAX);
STORE_FUNCTION(as_write_expire_store, &ad->fifo_expire[REQ_ASYNC], 0, INT_MAX); STORE_FUNCTION(as_write_expire_store,
&ad->fifo_expire[BLK_RW_ASYNC], 0, INT_MAX);
STORE_FUNCTION(as_antic_expire_store, &ad->antic_expire, 0, INT_MAX); STORE_FUNCTION(as_antic_expire_store, &ad->antic_expire, 0, INT_MAX);
STORE_FUNCTION(as_read_batch_expire_store, STORE_FUNCTION(as_read_batch_expire_store,
&ad->batch_expire[REQ_SYNC], 0, INT_MAX); &ad->batch_expire[BLK_RW_SYNC], 0, INT_MAX);
STORE_FUNCTION(as_write_batch_expire_store, STORE_FUNCTION(as_write_batch_expire_store,
&ad->batch_expire[REQ_ASYNC], 0, INT_MAX); &ad->batch_expire[BLK_RW_ASYNC], 0, INT_MAX);
#undef STORE_FUNCTION #undef STORE_FUNCTION
#define AS_ATTR(name) \ #define AS_ATTR(name) \