[PATCH] move remove_dquot_ref to dqout.c

Remove_dquot_ref can move to dqout.c instead of beeing in inode.c under
#ifdef CONFIG_QUOTA.  Also clean the resulting code up a tiny little bit by
testing sb->dq_op earlier - it's constant over a filesystems lifetime.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/dquot.c

@@ -79,6 +79,7 @@
 #include <linux/buffer_head.h>
 #include <linux/capability.h>
 #include <linux/quotaops.h>
+#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
 
 #include <asm/uaccess.h>
 
@@ -755,15 +756,30 @@ static void put_dquot_list(struct list_head *tofree_head)
 	}
 }
 
+static void remove_dquot_ref(struct super_block *sb, int type,
+		struct list_head *tofree_head)
+{
+	struct inode *inode;
+
+	spin_lock(&inode_lock);
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+		if (!IS_NOQUOTA(inode))
+			remove_inode_dquot_ref(inode, type, tofree_head);
+	}
+	spin_unlock(&inode_lock);
+}
+
 /* Gather all references from inodes and drop them */
 static void drop_dquot_ref(struct super_block *sb, int type)
 {
 	LIST_HEAD(tofree_head);
 
-	down_write(&sb_dqopt(sb)->dqptr_sem);
-	remove_dquot_ref(sb, type, &tofree_head);
-	up_write(&sb_dqopt(sb)->dqptr_sem);
-	put_dquot_list(&tofree_head);
+	if (sb->dq_op) {
+		down_write(&sb_dqopt(sb)->dqptr_sem);
+		remove_dquot_ref(sb, type, &tofree_head);
+		up_write(&sb_dqopt(sb)->dqptr_sem);
+		put_dquot_list(&tofree_head);
+	}
 }
 
 static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number)

fs/inode.c

@@ -1251,33 +1251,6 @@ int inode_needs_sync(struct inode *inode)
 
 EXPORT_SYMBOL(inode_needs_sync);
 
-/*
- *	Quota functions that want to walk the inode lists..
- */
-#ifdef CONFIG_QUOTA
-
-void remove_dquot_ref(struct super_block *sb, int type,
-			struct list_head *tofree_head)
-{
-	struct inode *inode;
-
-	if (!sb->dq_op)
-		return;	/* nothing to do */
-	spin_lock(&inode_lock);	/* This lock is for inodes code */
-
-	/*
-	 * We don't have to lock against quota code - test IS_QUOTAINIT is
-	 * just for speedup...
-	 */
-	list_for_each_entry(inode, &sb->s_inodes, i_sb_list)
-		if (!IS_NOQUOTA(inode))
-			remove_inode_dquot_ref(inode, type, tofree_head);
-
-	spin_unlock(&inode_lock);
-}
-
-#endif
-
 int inode_wait(void *word)
 {
 	schedule();

include/linux/fs.h

@@ -1688,7 +1688,6 @@ extern struct inode *new_inode(struct super_block *);
 extern int __remove_suid(struct dentry *, int);
 extern int should_remove_suid(struct dentry *);
 extern int remove_suid(struct dentry *);
-extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
 
 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
 extern void remove_inode_hash(struct inode *);