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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:42 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:35 -0600
commitd40f75a06dd675808eed385d490ba9468200b23f (patch)
treebe5fbf53681dbe330c4066cf3f1024f8d5fc18d1 /include/linux/blkdev.h
parentec8a6f2643923ee5b74d24fa8d134240379f436b (diff)
writeback, blkcg: restructure blk_{set|clear}_queue_congested()
blk_{set|clear}_queue_congested() take @q and set or clear, respectively, the congestion state of its bdi's root wb. Because bdi used to be able to handle congestion state only on the root wb, the callers of those functions tested whether the congestion is on the root blkcg and skipped if not. This is cumbersome and makes implementation of per cgroup bdi_writeback congestion state propagation difficult. This patch renames blk_{set|clear}_queue_congested() to blk_{set|clear}_congested(), and makes them take request_list instead of request_queue and test whether the specified request_list is the root one before updating bdi_writeback congestion state. This makes the tests in the callers unnecessary and simplifies them. As there are no external users of these functions, the definitions are moved from include/linux/blkdev.h to block/blk-core.c. This patch doesn't introduce any noticeable behavior difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h19
1 files changed, 0 insertions, 19 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 60d2726a6b62..ab4a27852f1b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -790,25 +790,6 @@ extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
extern void blk_queue_bio(struct request_queue *q, struct bio *bio);
-/*
- * A queue has just exitted congestion. Note this in the global counter of
- * congested queues, and wake up anyone who was waiting for requests to be
- * put back.
- */
-static inline void blk_clear_queue_congested(struct request_queue *q, int sync)
-{
- clear_bdi_congested(&q->backing_dev_info, sync);
-}
-
-/*
- * 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 inline void blk_set_queue_congested(struct request_queue *q, int sync)
-{
- set_bdi_congested(&q->backing_dev_info, sync);
-}
-
extern void blk_start_queue(struct request_queue *q);
extern void blk_stop_queue(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q);