sysfs: various updates.

- Don't do extra dget() when creating symlink. 
This is a long-standing bug with a simple and obvious fix. We were doing 
an extra dget() on the dentry after d_instantiate(). It only gets decremented
once on removal, so the dentry was never really going away, and the directory
wasn't, either. 

- Use simple_unlink() instead of sysfs_unlink().

- Use simple_rmdir() instead of our own, unrolled, version. 

- Remove MODULE_LICENSE(), since it's always in the kernel. 

fs/sysfs/inode.c

@@ -135,26 +135,14 @@ static int sysfs_symlink(struct inode * dir, struct dentry *dentry, const char *
 	if (inode) {
 		int l = strlen(symname)+1;
 		error = page_symlink(inode, symname, l);
-		if (!error) {
+		if (!error)
 			d_instantiate(dentry, inode);
-			dget(dentry);
-		} else
+		else
 			iput(inode);
 	}
 	return error;
 }
 
-static int sysfs_unlink(struct inode *dir, struct dentry *dentry)
-{
-	struct inode *inode = dentry->d_inode;
-	down(&inode->i_sem);
-	dentry->d_inode->i_nlink--;
-	up(&inode->i_sem);
-	d_invalidate(dentry);
-	dput(dentry);
-	return 0;
-}
-
 /**
  *	sysfs_read_file - read an attribute. 
  *	@file:	file pointer.
@@ -583,7 +571,8 @@ static void hash_and_remove(struct dentry * dir, const char * name)
 		/* make sure dentry is really there */
 		if (victim->d_inode && 
 		    (victim->d_parent->d_inode == dir->d_inode)) {
-			sysfs_unlink(dir->d_inode,victim);
+			d_invalidate(victim);
+			simple_unlink(dir->d_inode,victim);
 		}
 	}
 	up(&dir->d_inode->i_sem);
@@ -641,18 +630,15 @@ void sysfs_remove_dir(struct kobject * kobj)
 	list_for_each_safe(node,next,&dentry->d_subdirs) {
 		struct dentry * d = list_entry(node,struct dentry,d_child);
 		/* make sure dentry is still there */
-		if (d->d_inode)
-			sysfs_unlink(dentry->d_inode,d);
+		if (d->d_inode) {
+			d_invalidate(d);
+			simple_unlink(dentry->d_inode,d);
+		}
 	}
 
-	d_invalidate(dentry);
-	if (simple_empty(dentry)) {
-		dentry->d_inode->i_nlink -= 2;
-		dentry->d_inode->i_flags |= S_DEAD;
-		parent->d_inode->i_nlink--;
-	}
 	up(&dentry->d_inode->i_sem);
-	dput(dentry);
+	d_invalidate(dentry);
+	simple_rmdir(parent->d_inode,dentry);
 
 	up(&parent->d_inode->i_sem);
 	dput(parent);
@@ -664,4 +650,3 @@ EXPORT_SYMBOL(sysfs_create_link);
 EXPORT_SYMBOL(sysfs_remove_link);
 EXPORT_SYMBOL(sysfs_create_dir);
 EXPORT_SYMBOL(sysfs_remove_dir);
-MODULE_LICENSE("GPL");