f2fs: add sysfs entries to select the gc policy

[linux-2.6-block.git] / fs / f2fs / gc.c

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 60d4f674efa7fb9f8749141c1e49b1827dedaaf5..d286d8be8e6845d0b8b2334190bfcfca9b2bf88e 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -106,6 +106,8 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
        gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
        gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
 
+       gc_th->gc_idle = 0;
+
        sbi->gc_thread = gc_th;
        init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
        sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
@@ -130,9 +132,17 @@ void stop_gc_thread(struct f2fs_sb_info *sbi)
        sbi->gc_thread = NULL;
 }
 
-static int select_gc_type(int gc_type)
+static int select_gc_type(struct f2fs_gc_kthread *gc_th, int gc_type)
 {
-       return (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
+       int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
+
+       if (gc_th && gc_th->gc_idle) {
+               if (gc_th->gc_idle == 1)
+                       gc_mode = GC_CB;
+               else if (gc_th->gc_idle == 2)
+                       gc_mode = GC_GREEDY;
+       }
+       return gc_mode;
 }
 
 static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
@@ -145,7 +155,7 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
                p->dirty_segmap = dirty_i->dirty_segmap[type];
                p->ofs_unit = 1;
        } else {
-               p->gc_mode = select_gc_type(gc_type);
+               p->gc_mode = select_gc_type(sbi->gc_thread, gc_type);
                p->dirty_segmap = dirty_i->dirty_segmap[DIRTY];
                p->ofs_unit = sbi->segs_per_sec;
        }