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writeback: Generalize and expose wb_completion

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wb_completion is used to track writeback completions.  We want to use
it from memcg side for foreign inode flushes.  This patch updates it
to remember the target waitq instead of assuming bdi->wb_waitq and
expose it outside of fs-writeback.c.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-08-26 09:06:52 -07:00 • committed by Jens Axboe
parent 38b4e09fbc
commit 5b9cce4c7e
3 changed files with 36 additions and 33 deletions
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include/linux/backing-dev.h
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@ -44,6 +44,8 @@ void wb_start_background_writeback(struct bdi_writeback *wb);
void wb_workfn(struct work_struct *work);
void wb_wakeup_delayed(struct bdi_writeback *wb);
void wb_wait_for_completion(struct wb_completion *done);
extern spinlock_t bdi_lock;
extern struct list_head bdi_list;