release/src-rt-6.x.4708/linux/linux-2.6.36/fs/smbfs/symlink.c

   1 /*
   2  *  symlink.c
   3  *
   4  *  Copyright (C) 2002 by John Newbigin
   5  *
   6  *  Please add a note about your changes to smbfs in the ChangeLog file.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/errno.h>
  11 #include <linux/fcntl.h>
  12 #include <linux/stat.h>
  13 #include <linux/mm.h>
  14 #include <linux/slab.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/net.h>
  17 #include <linux/namei.h>
  18
  19 #include <asm/uaccess.h>
  20 #include <asm/system.h>
  21
  22 #include <linux/smbno.h>
  23 #include <linux/smb_fs.h>
  24
  25 #include "smb_debug.h"
  26 #include "proto.h"
  27
  28 int smb_symlink(struct inode *inode, struct dentry *dentry, const char *oldname)
  29 {
  30         DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));
  31
  32         return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
  33 }
  34
  35 static void *smb_follow_link(struct dentry *dentry, struct nameidata *nd)
  36 {
  37         char *link = __getname();
  38         DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
  39
  40         if (!link) {
  41                 link = ERR_PTR(-ENOMEM);
  42         } else {
  43                 int len = smb_proc_read_link(server_from_dentry(dentry),
  44                                                 dentry, link, PATH_MAX - 1);
  45                 if (len < 0) {
  46                         __putname(link);
  47                         link = ERR_PTR(len);
  48                 } else {
  49                         link[len] = 0;
  50                 }
  51         }
  52         nd_set_link(nd, link);
  53         return NULL;
  54 }
  55
  56 static void smb_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
  57 {
  58         char *s = nd_get_link(nd);
  59         if (!IS_ERR(s))
  60                 __putname(s);
  61 }
  62
  63 const struct inode_operations smb_link_inode_operations =
  64 {
  65         .readlink       = generic_readlink,
  66         .follow_link    = smb_follow_link,
  67         .put_link       = smb_put_link,
  68 };