Avoid losing context by propagating the various reason why we
initiate writeback. If we are doing more important reclaim or
synchronous writeback, the lower levels should know about it.
Signed-off-by: Jens Axboe <ax...@fb.com>
---
fs/fs-writeback.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index fee81e8768c9..4300ee7b1139 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -52,6 +52,7 @@ 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 for_reclaim:1; /* for mem reclaim */
unsigned int auto_free:1; /* free on completion */
enum wb_reason reason; /* why was writeback initiated? */
@@ -944,6 +945,17 @@ void wb_start_writeback(struct bdi_writeback *wb, long
nr_pages,
work->reason = reason;
work->auto_free = 1;
+ switch (reason) {
+ case WB_REASON_TRY_TO_FREE_PAGES:
+ case WB_REASON_FREE_MORE_MEM:
+ work->for_reclaim = 1;
+ case WB_REASON_SYNC:
+ work->for_sync = 1;
+ break;
+ default:
+ break;
+ }
+
wb_queue_work(wb, work);
}
@@ -1446,6 +1458,7 @@ static long writeback_sb_inodes(struct super_block *sb,
.for_kupdate = work->for_kupdate,
.for_background = work->for_background,
.for_sync = work->for_sync,
+ .for_reclaim = work->for_reclaim,
.range_cyclic = work->range_cyclic,
.range_start = 0,
.range_end = LLONG_MAX,
--
2.8.0.rc4.6.g7e4ba36
