f2fs: don't try to split extents shorter than F2FS_MIN_EXTENT_LEN

Since only parts of extents longer than F2FS_MIN_EXTENT_LEN will
be kept in extent cache after split, extents already shorter than
F2FS_MIN_EXTENT_LEN don't need to try split at all.

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

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index de55c08..ce0d5ec 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -585,7 +585,7 @@ static bool f2fs_update_extent_tree(struct inode *inode, pgoff_t fofs,
        __detach_extent_node(sbi, et, en);
 
        /* 2. if extent can be split more, split and insert the left part */
-       if (dei.len > 1) {
+       if (dei.len > F2FS_MIN_EXTENT_LEN) {
                /*  insert left part of split extent into cache */
                if (fofs - dei.fofs >= F2FS_MIN_EXTENT_LEN) {
                        set_extent_info(&ei, dei.fofs, dei.blk,