diff options
| -rw-r--r-- | block/ll_rw_blk.c | 12 | ||||
| -rw-r--r-- | fs/nfs/write.c | 1 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 1 | ||||
| -rw-r--r-- | include/linux/writeback.h | 1 | ||||
| -rw-r--r-- | mm/page-writeback.c | 9 |
5 files changed, 24 insertions, 0 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index ddd9253f9d55..dcbd6ff1fa33 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -2734,6 +2734,18 @@ long blk_congestion_wait(int rw, long timeout) 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 */ diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 453d44666ea5..38ba5c09af08 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -396,6 +396,7 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) out: clear_bit(BDI_write_congested, &bdi->state); wake_up_all(&nfs_write_congestion); + writeback_congestion_end(); return err; } diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index aafe82788b4e..96c9040c00a8 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -746,6 +746,7 @@ extern void blk_queue_free_tags(request_queue_t *); extern int blk_queue_resize_tags(request_queue_t *, int); extern void blk_queue_invalidate_tags(request_queue_t *); 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 int blkdev_issue_flush(struct block_device *, sector_t *); diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 9e38b566d0e7..0422036af4eb 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -85,6 +85,7 @@ int wakeup_pdflush(long nr_pages); void laptop_io_completion(void); void laptop_sync_completion(void); void throttle_vm_writeout(void); +void writeback_congestion_end(void); /* These are exported to sysctl. */ extern int dirty_background_ratio; diff --git a/mm/page-writeback.c b/mm/page-writeback.c index e630188ccc40..77a0bc4e261a 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -803,6 +803,15 @@ int test_set_page_writeback(struct page *page) 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 * passed tag. */ |