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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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2
include/linux/backing-dev.h
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@ -167,7 +167,7 @@ static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits)
{
if (bdi->congested_fn)
return bdi->congested_fn(bdi->congested_data, bdi_bits);
return (bdi->wb.state & bdi_bits);
return (bdi->wb.congested->state & bdi_bits);
}
static inline int bdi_read_congested(struct backing_dev_info *bdi)