f2fs: change the ipu_policy option to enable combinations

This patch changes the ipu_policy setting to use any combination of orthogonal policies.

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

3 files changed, 20 insertions, 27 deletions

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index d010da85a769..2cca5a25ef89 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -192,9 +192,9 @@ Files in /sys/fs/f2fs/<devname>
 
  ipu_policy                   This parameter controls the policy of in-place
                               updates in f2fs. There are five policies:
-                               0: F2FS_IPU_FORCE, 1: F2FS_IPU_SSR,
-                               2: F2FS_IPU_UTIL,  3: F2FS_IPU_SSR_UTIL,
-                               4: F2FS_IPU_FSYNC, 5: F2FS_IPU_DISABLE.
+                               0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,
+                               0x04: F2FS_IPU_UTIL,  0x08: F2FS_IPU_SSR_UTIL,
+                               0x10: F2FS_IPU_FSYNC.
 
  min_ipu_util                 This parameter controls the threshold to trigger
                               in-place-updates. The number indicates percentage
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 24b768ae39c4..3125a3d35245 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1928,7 +1928,7 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
         sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
         sm_info->rec_prefree_segments = sm_info->main_segments *
                                         DEF_RECLAIM_PREFREE_SEGMENTS / 100;
-        sm_info->ipu_policy = F2FS_IPU_FSYNC;
+        sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
         sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
         sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
 
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 032c0905a12b..d317b61f83a5 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -487,40 +487,33 @@ enum {
         F2FS_IPU_UTIL,
         F2FS_IPU_SSR_UTIL,
         F2FS_IPU_FSYNC,
-        F2FS_IPU_DISABLE,
 };
 
 static inline bool need_inplace_update(struct inode *inode)
 {
         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+        unsigned int policy = SM_I(sbi)->ipu_policy;
 
         /* IPU can be done only for the user data */
         if (S_ISDIR(inode->i_mode))
                 return false;
 
-        switch (SM_I(sbi)->ipu_policy) {
-        case F2FS_IPU_FORCE:
+        if (policy & (0x1 << F2FS_IPU_FORCE))
                 return true;
-        case F2FS_IPU_SSR:
-                if (need_SSR(sbi))
-                        return true;
-                break;
-        case F2FS_IPU_UTIL:
-                if (utilization(sbi) > SM_I(sbi)->min_ipu_util)
-                        return true;
-                break;
-        case F2FS_IPU_SSR_UTIL:
-                if (need_SSR(sbi) && utilization(sbi) > SM_I(sbi)->min_ipu_util)
-                        return true;
-                break;
-        case F2FS_IPU_FSYNC:
-                /* this is only set during fdatasync */
-                if (is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))
-                        return true;
-                break;
-        case F2FS_IPU_DISABLE:
-                break;
-        }
+        if (policy & (0x1 << F2FS_IPU_SSR) && need_SSR(sbi))
+                return true;
+        if (policy & (0x1 << F2FS_IPU_UTIL) &&
+                        utilization(sbi) > SM_I(sbi)->min_ipu_util)
+                return true;
+        if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && need_SSR(sbi) &&
+                        utilization(sbi) > SM_I(sbi)->min_ipu_util)
+                return true;
+
+        /* this is only set during fdatasync */
+        if (policy & (0x1 << F2FS_IPU_FSYNC) &&
+                        is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))
+                return true;
+
         return false;
 }