Commit 79e2de4b authored by Thomas Maier's avatar Thomas Maier Committed by Linus Torvalds
Browse files

[PATCH] export clear_queue_congested and set_queue_congested



Export the clear_queue_congested() and set_queue_congested() functions
located in ll_rw_blk.c

The functions are renamed to blk_clear_queue_congested() and
blk_set_queue_congested().

(needed in the pktcdvd driver's bio write congestion control)
Signed-off-by: default avatarThomas Maier <balagi@justmail.de>
Cc: Peter Osterlund <petero2@telia.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 26da8205
......@@ -117,7 +117,7 @@ static void blk_queue_congestion_threshold(struct request_queue *q)
* congested queues, and wake up anyone who was waiting for requests to be
* put back.
*/
static void clear_queue_congested(request_queue_t *q, int rw)
void blk_clear_queue_congested(request_queue_t *q, int rw)
{
enum bdi_state bit;
wait_queue_head_t *wqh = &congestion_wqh[rw];
......@@ -128,18 +128,20 @@ static void clear_queue_congested(request_queue_t *q, int rw)
if (waitqueue_active(wqh))
wake_up(wqh);
}
EXPORT_SYMBOL(blk_clear_queue_congested);
/*
* A queue has just entered congestion. Flag that in the queue's VM-visible
* state flags and increment the global gounter of congested queues.
*/
static void set_queue_congested(request_queue_t *q, int rw)
void blk_set_queue_congested(request_queue_t *q, int rw)
{
enum bdi_state bit;
bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
set_bit(bit, &q->backing_dev_info.state);
}
EXPORT_SYMBOL(blk_set_queue_congested);
/**
* blk_get_backing_dev_info - get the address of a queue's backing_dev_info
......@@ -159,7 +161,6 @@ struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev)
ret = &q->backing_dev_info;
return ret;
}
EXPORT_SYMBOL(blk_get_backing_dev_info);
void blk_queue_activity_fn(request_queue_t *q, activity_fn *fn, void *data)
......@@ -167,7 +168,6 @@ void blk_queue_activity_fn(request_queue_t *q, activity_fn *fn, void *data)
q->activity_fn = fn;
q->activity_data = data;
}
EXPORT_SYMBOL(blk_queue_activity_fn);
/**
......@@ -2067,7 +2067,7 @@ static void __freed_request(request_queue_t *q, int rw)
struct request_list *rl = &q->rq;
if (rl->count[rw] < queue_congestion_off_threshold(q))
clear_queue_congested(q, rw);
blk_clear_queue_congested(q, rw);
if (rl->count[rw] + 1 <= q->nr_requests) {
if (waitqueue_active(&rl->wait[rw]))
......@@ -2137,7 +2137,7 @@ static struct request *get_request(request_queue_t *q, int rw, struct bio *bio,
}
}
}
set_queue_congested(q, rw);
blk_set_queue_congested(q, rw);
}
/*
......@@ -3765,14 +3765,14 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count)
blk_queue_congestion_threshold(q);
if (rl->count[READ] >= queue_congestion_on_threshold(q))
set_queue_congested(q, READ);
blk_set_queue_congested(q, READ);
else if (rl->count[READ] < queue_congestion_off_threshold(q))
clear_queue_congested(q, READ);
blk_clear_queue_congested(q, READ);
if (rl->count[WRITE] >= queue_congestion_on_threshold(q))
set_queue_congested(q, WRITE);
blk_set_queue_congested(q, WRITE);
else if (rl->count[WRITE] < queue_congestion_off_threshold(q))
clear_queue_congested(q, WRITE);
blk_clear_queue_congested(q, WRITE);
if (rl->count[READ] >= q->nr_requests) {
blk_set_queue_full(q, READ);
......
......@@ -651,6 +651,8 @@ extern void blk_recount_segments(request_queue_t *, struct bio *);
extern int scsi_cmd_ioctl(struct file *, struct gendisk *, unsigned int, void __user *);
extern int sg_scsi_ioctl(struct file *, struct request_queue *,
struct gendisk *, struct scsi_ioctl_command __user *);
extern void blk_clear_queue_congested(request_queue_t *q, int rw);
extern void blk_set_queue_congested(request_queue_t *q, int rw);
extern void blk_start_queue(request_queue_t *q);
extern void blk_stop_queue(request_queue_t *q);
extern void blk_sync_queue(struct request_queue *q);
......
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