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author | Tejun Heo <tj@kernel.org> | 2015-05-22 17:13:58 -0400 |
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committer | Jens Axboe <axboe@fb.com> | 2015-06-02 08:33:36 -0600 |
commit | cc395d7f1f7b9c740ab6d367ef1f6eb248595dff (patch) | |
tree | a99a691af5b57da0f323f9e50ecf68be0d97ff01 /include/linux/backing-dev-defs.h | |
parent | ac7b19a34f332fdf8b13aac8708b14188fd1fbd2 (diff) | |
download | linux-stable-cc395d7f1f7b9c740ab6d367ef1f6eb248595dff.tar.gz linux-stable-cc395d7f1f7b9c740ab6d367ef1f6eb248595dff.tar.bz2 linux-stable-cc395d7f1f7b9c740ab6d367ef1f6eb248595dff.zip |
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 'include/linux/backing-dev-defs.h')
-rw-r--r-- | include/linux/backing-dev-defs.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index 8c857d723023..97a92fa0cdb5 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -155,6 +155,8 @@ struct backing_dev_info { struct rb_root cgwb_congested_tree; /* their congested states */ atomic_t usage_cnt; /* counts both cgwbs and cgwb_contested's */ #endif + wait_queue_head_t wb_waitq; + struct device *dev; struct timer_list laptop_mode_wb_timer; |