f2fs: use more free segments until SSR is activated

Previously, f2fs activates SSR if the # of free segments reaches to the # of
overprovisioned segments.
In this case, SSR starts to use dirty segments only, so that the overprovisoned
space cannot be selected for new data.
This means that we have no chance to utilizae the overprovisioned space at all.

This patch fixes that by allowing LFS allocations until the # of free segments
reaches to the last threshold, reserved space.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index d317b61f83a52fcc65e0eb3b473d9f3885347ba0..4588545b30304b2b97a184256b10be18554b7862 100644 (file)
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -437,8 +437,10 @@ static inline int reserved_sections(struct f2fs_sb_info *sbi)
 
 static inline bool need_SSR(struct f2fs_sb_info *sbi)
 {
-       return (prefree_segments(sbi) / sbi->segs_per_sec)
-                       + free_sections(sbi) < overprovision_sections(sbi);
+       int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
+       int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
+       return free_sections(sbi) <= (node_secs + 2 * dent_secs +
+                                               reserved_sections(sbi) + 1);
 }
 
 static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)