From 81eb8d6e2869b119d4a7b8c02091c3779733a3ac Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Thu, 24 Oct 2013 13:31:34 +0900 Subject: f2fs: reclaim prefree segments periodically Previously, f2fs postpones reclaiming prefree segments into free segments as much as possible. However, if user writes and deletes a bunch of data without any sync or fsync calls, some flash storages can suffer from garbage collections. So, this patch adds the reclaiming codes to f2fs_write_node_pages and background GC thread. If there are a lot of prefree segments, let's do checkpoint so that f2fs submits discard commands for the prefree regions to the flash storage. Signed-off-by: Changman Lee Signed-off-by: Jaegeuk Kim --- fs/f2fs/gc.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'fs/f2fs/gc.c') diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index cb286d7b02b2..783c6cc6253c 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -82,6 +82,11 @@ static int gc_thread_func(void *data) /* if return value is not zero, no victim was selected */ if (f2fs_gc(sbi)) wait_ms = gc_th->no_gc_sleep_time; + + /* balancing prefree segments */ + if (excess_prefree_segs(sbi)) + f2fs_sync_fs(sbi->sb, true); + } while (!kthread_should_stop()); return 0; } -- cgit v1.2.3