Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
[linux-2.6/linux-2.6-openrd.git] / fs / jffs2 / symlink.c
blob4ec11e8bda8c75a33336cba971128c2cd5ca073e
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/fs.h>
15 #include <linux/namei.h>
16 #include "nodelist.h"
18 static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);
20 const struct inode_operations jffs2_symlink_inode_operations =
22 .readlink = generic_readlink,
23 .follow_link = jffs2_follow_link,
24 .check_acl = jffs2_check_acl,
25 .setattr = jffs2_setattr,
26 .setxattr = jffs2_setxattr,
27 .getxattr = jffs2_getxattr,
28 .listxattr = jffs2_listxattr,
29 .removexattr = jffs2_removexattr
32 static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
34 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
35 char *p = (char *)f->target;
38 * We don't acquire the f->sem mutex here since the only data we
39 * use is f->target.
41 * 1. If we are here the inode has already built and f->target has
42 * to point to the target path.
43 * 2. Nobody uses f->target (if the inode is symlink's inode). The
44 * exception is inode freeing function which frees f->target. But
45 * it can't be called while we are here and before VFS has
46 * stopped using our f->target string which we provide by means of
47 * nd_set_link() call.
50 if (!p) {
51 printk(KERN_ERR "jffs2_follow_link(): can't find symlink target\n");
52 p = ERR_PTR(-EIO);
54 D1(printk(KERN_DEBUG "jffs2_follow_link(): target path is '%s'\n", (char *) f->target));
56 nd_set_link(nd, p);
59 * We will unlock the f->sem mutex but VFS will use the f->target string. This is safe
60 * since the only way that may cause f->target to be changed is iput() operation.
61 * But VFS will not use f->target after iput() has been called.
63 return NULL;