[PATCH] autofs4: change may_umount* functions to boolean

Change the functions may_umount and may_umount_tree to boolean functions to
aid code readability.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/autofs/dirhash.c

@@ -92,7 +92,7 @@ struct autofs_dir_ent *autofs_expire(struct super_block *sb,
 			;
 		dput(dentry);
 
-		if ( may_umount(mnt) == 0 ) {
+		if ( may_umount(mnt) ) {
 			mntput(mnt);
 			DPRINTK(("autofs: signaling expire on %s\n", ent->name));
 			return ent; /* Expirable! */

fs/autofs4/expire.c

@@ -64,7 +64,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
 		goto done;
 
 	/* Update the expiry counter if fs is busy */
-	if (may_umount_tree(mnt)) {
+	if (!may_umount_tree(mnt)) {
 		struct autofs_info *ino = autofs4_dentry_ino(top);
 		ino->last_used = jiffies;
 		goto done;

fs/autofs4/root.c

@@ -699,7 +699,7 @@ static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
 {
 	int status = 0;
 
-	if (may_umount(mnt) == 0)
+	if (may_umount(mnt))
 		status = 1;
 
 	DPRINTK("returning %d", status);

fs/namespace.c

@@ -459,9 +459,9 @@ int may_umount_tree(struct vfsmount *mnt)
 	spin_unlock(&vfsmount_lock);
 
 	if (actual_refs > minimum_refs)
-		return -EBUSY;
+		return 0;
 
-	return 0;
+	return 1;
 }
 
 EXPORT_SYMBOL(may_umount_tree);
@@ -481,10 +481,10 @@ EXPORT_SYMBOL(may_umount_tree);
  */
 int may_umount(struct vfsmount *mnt)
 {
-	int ret = 0;
+	int ret = 1;
 	spin_lock(&vfsmount_lock);
 	if (propagate_mount_busy(mnt, 2))
-		ret = -EBUSY;
+		ret = 0;
 	spin_unlock(&vfsmount_lock);
 	return ret;
 }