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>

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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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14

include/linux/backing-dev-defs.h

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2

include/linux/backing-dev.h

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