[PATCH 24/45] writeback: add wb_writeback_work->auto_free
From: Tejun Heo <tj@kernel.org>
Date: 2015-01-06 21:26:01
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
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> --- fs/fs-writeback.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8bf13e6..3c012b8 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c@@ -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 */
@@ -272,6 +273,7 @@ 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); }
@@ -1173,19 +1175,16 @@ 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); } /*
--
2.1.0
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