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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-10-24 13:31:34 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-10-25 16:54:37 +0900
commit81eb8d6e2869b119d4a7b8c02091c3779733a3ac (patch)
treecdff776596fa79bfc9c2f2baf7aa59470dc29aec /fs/f2fs/gc.c
parentaabe51364f44681cbd83fb1c27ef7d3dbe567c45 (diff)
downloadop-kernel-dev-81eb8d6e2869b119d4a7b8c02091c3779733a3ac.zip
op-kernel-dev-81eb8d6e2869b119d4a7b8c02091c3779733a3ac.tar.gz
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 <cm224.lee@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/gc.c')
-rw-r--r--fs/f2fs/gc.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index cb286d7..783c6cc 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;
}
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