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Add a real API for dealing with blk_congestion_wait()

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-08-22 20:06:24 -04:00
parent 94a6d75320
commit 275a082fe9
5 changed files with 24 additions and 0 deletions
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12
block/ll_rw_blk.c
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@ -2734,6 +2734,18 @@ long blk_congestion_wait(int rw, long timeout)
EXPORT_SYMBOL(blk_congestion_wait); EXPORT_SYMBOL(blk_congestion_wait);
/**
* blk_congestion_end - wake up sleepers on a congestion queue
* @rw: READ or WRITE
*/
void blk_congestion_end(int rw)
{
wait_queue_head_t *wqh = &congestion_wqh[rw];
if (waitqueue_active(wqh))
wake_up(wqh);
}
/* /*
* Has to be called with the request spinlock acquired * Has to be called with the request spinlock acquired
*/ */

1
fs/nfs/write.c
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@ -396,6 +396,7 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
out: out:
clear_bit(BDI_write_congested, &bdi->state); clear_bit(BDI_write_congested, &bdi->state);
wake_up_all(&nfs_write_congestion); wake_up_all(&nfs_write_congestion);
writeback_congestion_end();
return err; return err;
} }

1
include/linux/blkdev.h
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@ -746,6 +746,7 @@ extern void blk_queue_free_tags(request_queue_t *);
extern int blk_queue_resize_tags(request_queue_t *, int); extern int blk_queue_resize_tags(request_queue_t *, int);
extern void blk_queue_invalidate_tags(request_queue_t *); extern void blk_queue_invalidate_tags(request_queue_t *);
extern long blk_congestion_wait(int rw, long timeout); extern long blk_congestion_wait(int rw, long timeout);
extern void blk_congestion_end(int rw);
extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *); extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *);
extern int blkdev_issue_flush(struct block_device *, sector_t *); extern int blkdev_issue_flush(struct block_device *, sector_t *);

1
include/linux/writeback.h
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@ -85,6 +85,7 @@ int wakeup_pdflush(long nr_pages);
void laptop_io_completion(void); void laptop_io_completion(void);
void laptop_sync_completion(void); void laptop_sync_completion(void);
void throttle_vm_writeout(void); void throttle_vm_writeout(void);
void writeback_congestion_end(void);
/* These are exported to sysctl. */ /* These are exported to sysctl. */
extern int dirty_background_ratio; extern int dirty_background_ratio;

9
mm/page-writeback.c
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@ -802,6 +802,15 @@ int test_set_page_writeback(struct page *page)
} }
EXPORT_SYMBOL(test_set_page_writeback); EXPORT_SYMBOL(test_set_page_writeback);
/*
* Wakes up tasks that are being throttled due to writeback congestion
*/
void writeback_congestion_end(void)
{
blk_congestion_end(WRITE);
}
EXPORT_SYMBOL(writeback_congestion_end);
/* /*
* Return true if any of the pages in the mapping are marged with the * Return true if any of the pages in the mapping are marged with the
* passed tag. * passed tag.