66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2001, 2002 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: symlink.c,v 1.16 2005/03/01 10:50:48 dedekind Exp $
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include "nodelist.h"
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static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);
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struct inode_operations jffs2_symlink_inode_operations =
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{
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.readlink = generic_readlink,
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.follow_link = jffs2_follow_link,
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.setattr = jffs2_setattr
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};
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static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
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{
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struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
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char *p = (char *)f->dents;
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/*
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* We don't acquire the f->sem mutex here since the only data we
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* use is f->dents which in case of the symlink inode points to the
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* symlink's target path.
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*
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* 1. If we are here the inode has already built and f->dents has
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* to point to the target path.
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* 2. Nobody uses f->dents (if the inode is symlink's inode). The
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* exception is inode freeing function which frees f->dents. But
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* it can't be called while we are here and before VFS has
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* stopped using our f->dents string which we provide by means of
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* nd_set_link() call.
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*/
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if (!p) {
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printk(KERN_ERR "jffs2_follow_link(): can't find symlink taerget\n");
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p = ERR_PTR(-EIO);
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} else {
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D1(printk(KERN_DEBUG "jffs2_follow_link(): target path is '%s'\n", (char *) f->dents));
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}
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nd_set_link(nd, p);
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/*
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* We unlock the f->sem mutex but VFS will use the f->dents string. This is safe
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* since the only way that may cause f->dents to be changed is iput() operation.
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* But VFS will not use f->dents after iput() has been called.
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*/
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return NULL;
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}
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