f2fs: change reclaim rate in percentage

It is more reasonable to determine the reclaiming rate of prefree segments
according to the volume size, which is set to 5% by default.
For example, if the volume is 128GB, the prefree segments are reclaimed
when the number reaches to 6.4GB.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

2 files changed, 3 insertions, 2 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 6c5a4f0218ca..e7ff23a536a4 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1758,7 +1758,8 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
         sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
         sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
         sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
-        sm_info->rec_prefree_segments = DEF_RECLAIM_PREFREE_SEGMENTS;
+        sm_info->rec_prefree_segments = sm_info->main_segments *
+                                        DEF_RECLAIM_PREFREE_SEGMENTS / 100;
         sm_info->ipu_policy = F2FS_IPU_DISABLE;
         sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
 
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 9fc46ee27bb8..7091204680f4 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -14,7 +14,7 @@
 #define NULL_SEGNO                      ((unsigned int)(~0))
 #define NULL_SECNO                      ((unsigned int)(~0))
 
-#define DEF_RECLAIM_PREFREE_SEGMENTS    100     /* 200MB of prefree segments */
+#define DEF_RECLAIM_PREFREE_SEGMENTS    5       /* 5% over total segments */
 
 /* L: Logical segment # in volume, R: Relative segment # in main area */
 #define GET_L2R_SEGNO(free_i, segno)    (segno - free_i->start_segno)