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authorTejun Heo <tj@kernel.org>2015-05-23 00:13:58 +0300
committerJens Axboe <axboe@fb.com>2015-06-02 17:33:36 +0300
commitcc395d7f1f7b9c740ab6d367ef1f6eb248595dff (patch)
treea99a691af5b57da0f323f9e50ecf68be0d97ff01 /mm/backing-dev.c
parentac7b19a34f332fdf8b13aac8708b14188fd1fbd2 (diff)
downloadlinux-cc395d7f1f7b9c740ab6d367ef1f6eb248595dff.tar.xz
writeback: implement bdi_wait_for_completion()
If the completion of a wb_writeback_work can be waited upon by setting its ->done to a struct completion and waiting on it; however, for cgroup writeback support, it's necessary to issue multiple work items to multiple bdi_writebacks and wait for the completion of all. This patch implements wb_completion which can wait for multiple work items and replaces the struct completion with it. It can be defined using DEFINE_WB_COMPLETION_ONSTACK(), used for multiple work items and waited for by wb_wait_for_completion(). Nobody currently issues multiple work items and this patch doesn't introduce any behavior changes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index d2f16fc9069a..ad5608d01e8c 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -768,6 +768,7 @@ int bdi_init(struct backing_dev_info *bdi)
bdi->max_ratio = 100;
bdi->max_prop_frac = FPROP_FRAC_BASE;
INIT_LIST_HEAD(&bdi->bdi_list);
+ init_waitqueue_head(&bdi->wb_waitq);
err = wb_init(&bdi->wb, bdi, GFP_KERNEL);
if (err)