drivers/staging/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 "smbno.h"
  23 #include "smb_fs.h"
  24 #include "smb_debug.h"
  25 #include "proto.h"
  26
  27 int smb_symlink(struct inode *inode, struct dentry *dentry, const char *oldname)
  28 {
  29         DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));
  30
  31         return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
  32 }
  33
  34 static void *smb_follow_link(struct dentry *dentry, struct nameidata *nd)
  35 {
  36         char *link = __getname();
  37         DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
  38
  39         if (!link) {
  40                 link = ERR_PTR(-ENOMEM);
  41         } else {
  42                 int len = smb_proc_read_link(server_from_dentry(dentry),
  43                                                 dentry, link, PATH_MAX - 1);
  44                 if (len < 0) {
  45                         __putname(link);
  46                         link = ERR_PTR(len);
  47                 } else {
  48                         link[len] = 0;
  49                 }
  50         }
  51         nd_set_link(nd, link);
  52         return NULL;
  53 }
  54
  55 static void smb_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
  56 {
  57         char *s = nd_get_link(nd);
  58         if (!IS_ERR(s))
  59                 __putname(s);
  60 }
  61
  62 const struct inode_operations smb_link_inode_operations =
  63 {
  64         .readlink       = generic_readlink,
  65         .follow_link    = smb_follow_link,
  66         .put_link       = smb_put_link,
  67 };