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/smp_lock.h>
  17 #include <linux/net.h>
  18 #include <linux/namei.h>
  19
  20 #include <asm/uaccess.h>
  21 #include <asm/system.h>
  22
  23 #include <linux/smbno.h>
  24 #include <linux/smb_fs.h>
  25
  26 #include "smb_debug.h"
  27 #include "proto.h"
  28
  29 int smb_symlink(struct inode *inode, struct dentry *dentry, const char *oldname)
  30 {
  31         DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));
  32
  33         return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
  34 }
  35
  36 static void *smb_follow_link(struct dentry *dentry, struct nameidata *nd)
  37 {
  38         char *link = __getname();
  39         DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
  40
  41         if (!link) {
  42                 link = ERR_PTR(-ENOMEM);
  43         } else {
  44                 int len = smb_proc_read_link(server_from_dentry(dentry),
  45                                                 dentry, link, PATH_MAX - 1);
  46                 if (len < 0) {
  47                         __putname(link);
  48                         link = ERR_PTR(len);
  49                 } else {
  50                         link[len] = 0;
  51                 }
  52         }
  53         nd_set_link(nd, link);
  54         return NULL;
  55 }
  56
  57 static void smb_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
  58 {
  59         char *s = nd_get_link(nd);
  60         if (!IS_ERR(s))
  61                 __putname(s);
  62 }
  63
  64 const struct inode_operations smb_link_inode_operations =
  65 {
  66         .readlink       = generic_readlink,
  67         .follow_link    = smb_follow_link,
  68         .put_link       = smb_put_link,
  69 };