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bdi: separate out congested state into a separate struct

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Currently, a wb's (bdi_writeback) congestion state is carried in its
->state field; however, cgroup writeback support will require multiple
wb's sharing the same congestion state.  This patch separates out
congestion state into its own struct - struct bdi_writeback_congested.
A new field wb field, wb_congested, points to its associated congested
struct.  The default wb, bdi->wb, always points to bdi->wb_congested.

While this patch adds a layer of indirection, it doesn't introduce any
behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-05-22 17:13:35 -04:00 • committed by Jens Axboe
parent 8395cd9f81
commit 4aa9c692e0
3 changed files with 18 additions and 5 deletions
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7
mm/backing-dev.c
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@ -383,6 +383,9 @@ int bdi_init(struct backing_dev_info *bdi)
if (err)
return err;
bdi->wb_congested.state = 0;
bdi->wb.congested = &bdi->wb_congested;
return 0;
}
EXPORT_SYMBOL(bdi_init);
@ -504,7 +507,7 @@ void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
wait_queue_head_t *wqh = &congestion_wqh[sync];
bit = sync ? WB_sync_congested : WB_async_congested;
if (test_and_clear_bit(bit, &bdi->wb.state))
if (test_and_clear_bit(bit, &bdi->wb.congested->state))
atomic_dec(&nr_bdi_congested[sync]);
smp_mb__after_atomic();
if (waitqueue_active(wqh))
@ -517,7 +520,7 @@ void set_bdi_congested(struct backing_dev_info *bdi, int sync)
enum wb_state bit;
bit = sync ? WB_sync_congested : WB_async_congested;
if (!test_and_set_bit(bit, &bdi->wb.state))
if (!test_and_set_bit(bit, &bdi->wb.congested->state))
atomic_inc(&nr_bdi_congested[sync]);
}
EXPORT_SYMBOL(set_bdi_congested);