2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001, 2002 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
10 * $Id: symlink.c,v 1.19 2005/11/07 11:14:42 gleixner Exp $
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
18 #include <linux/namei.h>
21 static void *jffs2_follow_link(struct dentry
*dentry
, struct nameidata
*nd
);
23 struct inode_operations jffs2_symlink_inode_operations
=
25 .readlink
= generic_readlink
,
26 .follow_link
= jffs2_follow_link
,
27 .setattr
= jffs2_setattr
30 static void *jffs2_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
32 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(dentry
->d_inode
);
33 char *p
= (char *)f
->target
;
36 * We don't acquire the f->sem mutex here since the only data we
39 * 1. If we are here the inode has already built and f->target has
40 * to point to the target path.
41 * 2. Nobody uses f->target (if the inode is symlink's inode). The
42 * exception is inode freeing function which frees f->target. But
43 * it can't be called while we are here and before VFS has
44 * stopped using our f->target string which we provide by means of
49 printk(KERN_ERR
"jffs2_follow_link(): can't find symlink taerget\n");
52 D1(printk(KERN_DEBUG
"jffs2_follow_link(): target path is '%s'\n", (char *) f
->target
));
57 * We will unlock the f->sem mutex but VFS will use the f->target string. This is safe
58 * since the only way that may cause f->target to be changed is iput() operation.
59 * But VFS will not use f->target after iput() has been called.