nilfs2: get rid of back pointer to writable sb instance

Nilfs object holds a back pointer to a writable super block instance
in nilfs->ns_writer, and this became eliminable since sb is now made
per device and all inodes have a valid pointer to it.

This deletes the ns_writer pointer and a reader/writer semaphore
protecting it.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 0 insertions, 4 deletions

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index b0c5e08d06c8..56350bf1f79f 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2799,7 +2799,6 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
 int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi,
                                      struct nilfs_root *root)
 {
-        struct the_nilfs *nilfs = sbi->s_nilfs;
         int err;
 
         if (NILFS_SC(sbi)) {
@@ -2815,10 +2814,8 @@ int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi,
         if (!sbi->s_sc_info)
                 return -ENOMEM;
 
-        nilfs_attach_writer(nilfs, sbi);
         err = nilfs_segctor_start_thread(NILFS_SC(sbi));
         if (err) {
-                nilfs_detach_writer(nilfs, sbi);
                 kfree(sbi->s_sc_info);
                 sbi->s_sc_info = NULL;
         }
@@ -2855,5 +2852,4 @@ void nilfs_detach_segment_constructor(struct nilfs_sb_info *sbi)
         up_write(&nilfs->ns_segctor_sem);
 
         nilfs_dispose_list(sbi, &garbage_list, 1);
-        nilfs_detach_writer(nilfs, sbi);
 }