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1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
3 | * |
4 | * Copyright © 2001-2007 Red Hat, Inc. |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> |
7 | * |
8 | * For licensing information, see the file 'LICENCE' in this directory. |
9 | * |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/fs.h> |
14 | #include <linux/namei.h> |
15 | #include "nodelist.h" |
16 | |
17 | static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd); |
18 | |
19 | const struct inode_operations jffs2_symlink_inode_operations = |
20 | { |
21 | .readlink = generic_readlink, |
22 | .follow_link = jffs2_follow_link, |
23 | .check_acl = jffs2_check_acl, |
24 | .setattr = jffs2_setattr, |
25 | .setxattr = jffs2_setxattr, |
26 | .getxattr = jffs2_getxattr, |
27 | .listxattr = jffs2_listxattr, |
28 | .removexattr = jffs2_removexattr |
29 | }; |
30 | |
31 | static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
32 | { |
33 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
34 | char *p = (char *)f->target; |
35 | |
36 | /* |
37 | * We don't acquire the f->sem mutex here since the only data we |
38 | * use is f->target. |
39 | * |
40 | * 1. If we are here the inode has already built and f->target has |
41 | * to point to the target path. |
42 | * 2. Nobody uses f->target (if the inode is symlink's inode). The |
43 | * exception is inode freeing function which frees f->target. But |
44 | * it can't be called while we are here and before VFS has |
45 | * stopped using our f->target string which we provide by means of |
46 | * nd_set_link() call. |
47 | */ |
48 | |
49 | if (!p) { |
50 | printk(KERN_ERR "jffs2_follow_link(): can't find symlink target\n"); |
51 | p = ERR_PTR(-EIO); |
52 | } |
53 | D1(printk(KERN_DEBUG "jffs2_follow_link(): target path is '%s'\n", (char *) f->target)); |
54 | |
55 | nd_set_link(nd, p); |
56 | |
57 | /* |
58 | * We will unlock the f->sem mutex but VFS will use the f->target string. This is safe |
59 | * since the only way that may cause f->target to be changed is iput() operation. |
60 | * But VFS will not use f->target after iput() has been called. |
61 | */ |
62 | return NULL; |
63 | } |
64 | |
65 |
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