nilfs2: stop using periodic write_super callback

This removes nilfs_write_super and commit super block in nilfs
internal thread, instead of periodic write_super callback.

VFS layer calls ->write_super callback periodically.  However,
it looks like that calling back is ommited when disk I/O is busy.
And when cleanerd (nilfs GC) is runnig, disk I/O tend to be busy thus
nilfs superblock is not synchronized as nilfs designed.

To avoid it, syncing superblock by nilfs thread instead of pdflush.

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

2 files changed, 7 insertions, 46 deletions

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 51ff3d0a4ee..683df89dbae 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2501,7 +2501,8 @@ static int nilfs_segctor_construct(struct nilfs_sc_info *sci,
                 if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
                     nilfs_discontinued(nilfs)) {
                         down_write(&nilfs->ns_sem);
-                        req->sb_err = nilfs_commit_super(sbi, 0);
+                        req->sb_err = nilfs_commit_super(sbi,
+                                        nilfs_altsb_need_update(nilfs));
                         up_write(&nilfs->ns_sem);
                 }
         }
@@ -2689,6 +2690,7 @@ static int nilfs_segctor_thread(void *arg)
         } else {
                 DEFINE_WAIT(wait);
                 int should_sleep = 1;
+                struct the_nilfs *nilfs;
 
                 prepare_to_wait(&sci->sc_wait_daemon, &wait,
                                 TASK_INTERRUPTIBLE);
@@ -2709,6 +2711,9 @@ static int nilfs_segctor_thread(void *arg)
                 finish_wait(&sci->sc_wait_daemon, &wait);
                 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
                            time_after_eq(jiffies, sci->sc_timer->expires));
+                nilfs = sci->sc_sbi->s_nilfs;
+                if (sci->sc_super->s_dirt && nilfs_sb_need_update(nilfs))
+                        set_nilfs_discontinued(nilfs);
         }
         goto loop;
 
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 70e8613a195..ed8ec5718ae 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -67,7 +67,6 @@ MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
                    "(NILFS)");
 MODULE_LICENSE("GPL");
 
-static void nilfs_write_super(struct super_block *sb);
 static int nilfs_remount(struct super_block *sb, int *flags, char *data);
 
 /**
@@ -335,49 +334,6 @@ static void nilfs_put_super(struct super_block *sb)
         unlock_kernel();
 }
 
-/**
- * nilfs_write_super - write super block(s) of NILFS
- * @sb: super_block
- *
- * nilfs_write_super() gets a fs-dependent lock, writes super block(s), and
- * clears s_dirt.  This function is called in the section protected by
- * lock_super().
- *
- * The s_dirt flag is managed by each filesystem and we protect it by ns_sem
- * of the struct the_nilfs.  Lock order must be as follows:
- *
- *   1. lock_super()
- *   2.    down_write(&nilfs->ns_sem)
- *
- * Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer
- * of the super block (nilfs->ns_sbp[]).
- *
- * In most cases, VFS functions call lock_super() before calling these
- * methods.  So we must be careful not to bring on deadlocks when using
- * lock_super();  see generic_shutdown_super(), write_super(), and so on.
- *
- * Note that order of lock_kernel() and lock_super() depends on contexts
- * of VFS.  We should also note that lock_kernel() can be used in its
- * protective section and only the outermost one has an effect.
- */
-static void nilfs_write_super(struct super_block *sb)
-{
-        struct nilfs_sb_info *sbi = NILFS_SB(sb);
-        struct the_nilfs *nilfs = sbi->s_nilfs;
-
-        down_write(&nilfs->ns_sem);
-        if (!(sb->s_flags & MS_RDONLY)) {
-                if (!nilfs_discontinued(nilfs) &&
-                    !nilfs_sb_need_update(nilfs)) {
-                        up_write(&nilfs->ns_sem);
-                        return;
-                }
-                nilfs_commit_super(sbi, nilfs_altsb_need_update(nilfs));
-        }
-        sb->s_dirt = 0;
-        up_write(&nilfs->ns_sem);
-}
-
 static int nilfs_sync_fs(struct super_block *sb, int wait)
 {
         struct nilfs_sb_info *sbi = NILFS_SB(sb);
@@ -558,7 +514,7 @@ static struct super_operations nilfs_sops = {
         /* .drop_inode    = nilfs_drop_inode, */
         .delete_inode   = nilfs_delete_inode,
         .put_super      = nilfs_put_super,
-        .write_super    = nilfs_write_super,
+        /* .write_super    = nilfs_write_super, */
         .sync_fs        = nilfs_sync_fs,
         /* .write_super_lockfs */
         /* .unlockfs */