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/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/fcntl.h>
  13 #include <linux/stat.h>
  14 #include <linux/mm.h>
  15 #include <linux/slab.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/smp_lock.h>
  18 #include <linux/net.h>
  19 #include <linux/namei.h>
  20
  21 #include <asm/uaccess.h>
  22 #include <asm/system.h>
  23
  24 #include <linux/smbno.h>
  25 #include <linux/smb_fs.h>
  26
  27 #include "smb_debug.h"
  28 #include "proto.h"
  29
  30 int smb_symlink(struct inode *inode, struct dentry *dentry, const char *oldname)
  31 {
  32         DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));
  33
  34         return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
  35 }
  36
  37 static void *smb_follow_link(struct dentry *dentry, struct nameidata *nd)
  38 {
  39         char *link = __getname();
  40         DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
  41
  42         if (!link) {
  43                 link = ERR_PTR(-ENOMEM);
  44         } else {
  45                 int len = smb_proc_read_link(server_from_dentry(dentry),
  46                                                 dentry, link, PATH_MAX - 1);
  47                 if (len < 0) {
  48                         putname(link);
  49                         link = ERR_PTR(len);
  50                 } else {
  51                         link[len] = 0;
  52                 }
  53         }
  54         nd_set_link(nd, link);
  55         return NULL;
  56 }
  57
  58 static void smb_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
  59 {
  60         char *s = nd_get_link(nd);
  61         if (!IS_ERR(s))
  62                 putname(s);
  63 }
  64
  65 struct inode_operations smb_link_inode_operations =
  66 {
  67         .readlink       = generic_readlink,
  68         .follow_link    = smb_follow_link,
  69         .put_link       = smb_put_link,
  70 };