f2fs: enable in-place-update for fdatasync

This patch enforces in-place-updates only when fdatasync is requested.
If we adopt this in-place-updates for the fdatasync, we can skip to write the
recovery information.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

3 files changed, 12 insertions, 0 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ab3602576fb2..8f8685e16863 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -998,6 +998,7 @@ enum {
         FI_INLINE_DATA,         /* used for inline data*/
         FI_APPEND_WRITE,        /* inode has appended data */
         FI_UPDATE_WRITE,        /* inode has in-place-update data */
+        FI_NEED_IPU,            /* used fo ipu for fdatasync */
 };
 
 static inline void set_inode_flag(struct f2fs_inode_info *fi, int flag)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9b888fbf08b6..95501358932c 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -127,7 +127,14 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
                 return 0;
 
         trace_f2fs_sync_file_enter(inode);
+
+        /* if fdatasync is triggered, let's do in-place-update */
+        if (datasync)
+                set_inode_flag(fi, FI_NEED_IPU);
+
         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
+        if (datasync)
+                clear_inode_flag(fi, FI_NEED_IPU);
         if (ret) {
                 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
                 return ret;
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index ee5c75e08d9c..55973f7b0330 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -486,6 +486,10 @@ static inline bool need_inplace_update(struct inode *inode)
         if (S_ISDIR(inode->i_mode))
                 return false;
 
+        /* this is only set during fdatasync */
+        if (is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))
+                return true;
+
         switch (SM_I(sbi)->ipu_policy) {
         case F2FS_IPU_FORCE:
                 return true;