diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index e3d1785..b14788e 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -772,7 +772,7 @@
 
 static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
 {
-	struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	int ret = 0;
 
 	if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
@@ -788,8 +788,7 @@
 
 static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
 {
-	struct nilfs_sb_info *sbi = sci->sc_sbi;
-	struct the_nilfs *nilfs = sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 
 	nilfs_mdt_clear_dirty(sci->sc_root->ifile);
 	nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
@@ -799,7 +798,7 @@
 
 static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
 {
-	struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	struct buffer_head *bh_cp;
 	struct nilfs_checkpoint *raw_cp;
 	int err;
@@ -823,8 +822,7 @@
 
 static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
 {
-	struct nilfs_sb_info *sbi = sci->sc_sbi;
-	struct the_nilfs *nilfs = sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	struct buffer_head *bh_cp;
 	struct nilfs_checkpoint *raw_cp;
 	int err;
@@ -1048,8 +1046,7 @@
 
 static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
 {
-	struct nilfs_sb_info *sbi = sci->sc_sbi;
-	struct the_nilfs *nilfs = sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	struct list_head *head;
 	struct nilfs_inode_info *ii;
 	size_t ndone;
@@ -1858,7 +1855,7 @@
 {
 	struct nilfs_segment_buffer *segbuf;
 	struct page *bd_page = NULL, *fs_page = NULL;
-	struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	int update_sr = false;
 
 	list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
@@ -2029,8 +2026,7 @@
  */
 static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
 {
-	struct nilfs_sb_info *sbi = sci->sc_sbi;
-	struct the_nilfs *nilfs = sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	struct page *failed_page;
 	int err;
 
@@ -2388,7 +2384,7 @@
  */
 static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
 {
-	struct nilfs_sb_info *sbi = sci->sc_sbi;
+	struct nilfs_sb_info *sbi = NILFS_SB(sci->sc_super);
 	struct the_nilfs *nilfs = sbi->s_nilfs;
 	struct nilfs_super_block **sbp;
 	int err = 0;
@@ -2501,7 +2497,7 @@
 
 static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
 {
-	struct nilfs_sb_info *sbi = sci->sc_sbi;
+	struct nilfs_sb_info *sbi = NILFS_SB(sci->sc_super);
 	struct nilfs_transaction_info ti;
 
 	nilfs_transaction_lock(sbi, &ti, 0);
@@ -2561,7 +2557,7 @@
 static int nilfs_segctor_thread(void *arg)
 {
 	struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
-	struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	int timeout = 0;
 
 	sci->sc_timer.data = (unsigned long)current;
@@ -2682,7 +2678,6 @@
 	if (!sci)
 		return NULL;
 
-	sci->sc_sbi = sbi;
 	sci->sc_super = sbi->s_super;
 
 	nilfs_get_root(root);
@@ -2717,7 +2712,7 @@
 	/* The segctord thread was stopped and its timer was removed.
 	   But some tasks remain. */
 	do {
-		struct nilfs_sb_info *sbi = sci->sc_sbi;
+		struct nilfs_sb_info *sbi = NILFS_SB(sci->sc_super);
 		struct nilfs_transaction_info ti;
 
 		nilfs_transaction_lock(sbi, &ti, 0);
@@ -2737,7 +2732,7 @@
  */
 static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
 {
-	struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
+	struct the_nilfs *nilfs = NILFS_SB(sci->sc_super)->s_nilfs;
 	int flag;
 
 	up_write(&nilfs->ns_segctor_sem);