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writeback: add wb_writeback_work->auto_free 

Currently, a wb_writeback_work is freed automatically on completion if
it doesn't have ->done set.  Add wb_writeback_work->auto_free to make
the switch explicit.  This will help cgroup writeback support where
waiting for completion and whether to free automatically don't
necessarily move together.

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>
This commit is contained in:
Tejun Heo 2015-05-22 17:13:57 -04:00 committed by Jens Axboe
parent 001fe6f617
commit ac7b19a34f
1 changed files with 6 additions and 7 deletions
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13
fs/fs-writeback.c
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@ -47,6 +47,7 @@ struct wb_writeback_work {
unsigned int range_cyclic:1;
unsigned int for_background:1;
unsigned int for_sync:1; /* sync(2) WB_SYNC_ALL writeback */
unsigned int auto_free:1; /* free on completion */
enum wb_reason reason; /* why was writeback initiated? */
struct list_head list; /* pending work list */
@ -258,6 +259,7 @@ void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
work->nr_pages = nr_pages;
work->range_cyclic = range_cyclic;
work->reason = reason;
work->auto_free = 1;
wb_queue_work(wb, work);
}
@ -1141,19 +1143,16 @@ static long wb_do_writeback(struct bdi_writeback *wb)
set_bit(WB_writeback_running, &wb->state);
while ((work = get_next_work_item(wb)) != NULL) {
struct completion *done = work->done;
trace_writeback_exec(wb->bdi, work);
wrote += wb_writeback(wb, work);
/*
* Notify the caller of completion if this is a synchronous
* work item, otherwise just free it.
*/
if (work->done)
complete(work->done);
else
if (work->auto_free)
kfree(work);
if (done)
complete(done);
}
/*