[PATCH 2/2] ->write_super lock_super pushdown

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Only four filesystems have both a ->write_super method and use lock_super
internally: ext4, fat, sysv, ufs.  Push down lock_super into these
filesystems and remove it from the caller.  Add a get_fs_excl/put_fs_excl
pair to sync_super for now to keep the current behaviour in that
respect.  Calling it a second time from write_super is fine as it's
only checked for beeing non-zero.


Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: vfs-2.6/fs/ext4/super.c
===================================================================
--- vfs-2.6.orig/fs/ext4/super.c	2009-05-06 21:35:40.923658961 +0200
+++ vfs-2.6/fs/ext4/super.c	2009-05-06 21:37:07.337661434 +0200
@@ -66,6 +66,7 @@ static int ext4_remount(struct super_blo
 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int ext4_unfreeze(struct super_block *sb);
 static void ext4_write_super(struct super_block *sb);
+static void ext4_write_super_locked(struct super_block *sb);
 static int ext4_freeze(struct super_block *sb);
 
 
@@ -566,7 +567,7 @@ static void ext4_put_super(struct super_
 	lock_super(sb);
 	lock_kernel();
 	if (sb->s_dirt)
-		ext4_write_super(sb);
+		ext4_write_super_locked(sb);
 
 	ext4_mb_release(sb);
 	ext4_ext_release(sb);
@@ -3273,7 +3274,7 @@ int ext4_force_commit(struct super_block
  * point.  (We can probably nuke this function altogether, and remove
  * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...)
  */
-static void ext4_write_super(struct super_block *sb)
+static void ext4_write_super_locked(struct super_block *sb)
 {
 	if (EXT4_SB(sb)->s_journal) {
 		if (mutex_trylock(&sb->s_lock) != 0)
@@ -3284,6 +3285,13 @@ static void ext4_write_super(struct supe
 	}
 }
 
+static void ext4_write_super(struct super_block *sb)
+{
+	lock_super(sb);
+	ext4_write_super_locked(sb);
+	unlock_super(sb);
+}
+
 static int ext4_sync_fs(struct super_block *sb, int wait)
 {
 	int ret = 0;
Index: vfs-2.6/fs/fat/inode.c
===================================================================
--- vfs-2.6.orig/fs/fat/inode.c	2009-05-06 21:37:16.737659384 +0200
+++ vfs-2.6/fs/fat/inode.c	2009-05-06 21:37:53.358661652 +0200
@@ -441,8 +441,10 @@ static void fat_clear_inode(struct inode
 
 static void fat_write_super(struct super_block *sb)
 {
+	lock_super(sb);
 	sb->s_dirt = 0;
 	fat_clusters_flush(sb);
+	unlock_super(sb);
 }
 
 static void fat_put_super(struct super_block *sb)
Index: vfs-2.6/fs/super.c
===================================================================
--- vfs-2.6.orig/fs/super.c	2009-05-06 21:41:00.805784126 +0200
+++ vfs-2.6/fs/super.c	2009-05-06 21:41:57.191661325 +0200
@@ -421,7 +421,6 @@ restart:
 			spin_unlock(&sb_lock);
 
 			down_read(&sb->s_umount);
-			lock_super(sb);
 			if (sb->s_root) {
 				/*
 				 * Avoid loops if a filesystem left s_dirt
@@ -433,10 +432,12 @@ restart:
 				if (sb->s_flags & MS_RDONLY)
 					sb->s_dirt = 0;
 
-				if (sb->s_dirt)
+				if (sb->s_dirt) {
+					get_fs_excl();
 					sb->s_op->write_super(sb);
+					put_fs_excl();
+				}
 			}
-			unlock_super(sb);
 			up_read(&sb->s_umount);
 
 			spin_lock(&sb_lock);
Index: vfs-2.6/fs/sysv/inode.c
===================================================================
--- vfs-2.6.orig/fs/sysv/inode.c	2009-05-06 21:39:21.263682879 +0200
+++ vfs-2.6/fs/sysv/inode.c	2009-05-06 21:39:58.219661498 +0200
@@ -37,6 +37,7 @@ static void sysv_write_super(struct supe
 	struct sysv_sb_info *sbi = SYSV_SB(sb);
 	unsigned long time = get_seconds(), old_time;
 
+	lock_super(sb);
 	lock_kernel();
 	/*
 	 * If we are going to write out the super block,
@@ -53,6 +54,7 @@ static void sysv_write_super(struct supe
 
 	sb->s_dirt = 0;
 	unlock_kernel();
+	unlock_super(sb);
 }
 
 static int sysv_remount(struct super_block *sb, int *flags, char *data)
Index: vfs-2.6/fs/ufs/super.c
===================================================================
--- vfs-2.6.orig/fs/ufs/super.c	2009-05-06 21:40:01.440659714 +0200
+++ vfs-2.6/fs/ufs/super.c	2009-05-06 21:40:33.502786591 +0200
@@ -1131,6 +1131,7 @@ static void ufs_write_super(struct super
 	struct ufs_super_block_third * usb3;
 	unsigned flags;
 
+	lock_super(sb);
 	lock_kernel();
 	UFSD("ENTER\n");
 	flags = UFS_SB(sb)->s_flags;
@@ -1149,6 +1150,7 @@ static void ufs_write_super(struct super
 	sb->s_dirt = 0;
 	UFSD("EXIT\n");
 	unlock_kernel();
+	unlock_super(sb);
 }
 
 static void ufs_put_super(struct super_block *sb)
--
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