fs/cifs/ioctl.c

   1 /*
   2  *   fs/cifs/ioctl.c
   3  *
   4  *   vfs operations that deal with io control
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2005,2007
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/fs.h>
  25 #include "cifspdu.h"
  26 #include "cifsglob.h"
  27 #include "cifsproto.h"
  28 #include "cifs_debug.h"
  29 #include "cifsfs.h"
  30
  31 #define CIFS_IOC_CHECKUMOUNT _IO(0xCF, 2)
  32
  33 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
  34 {
  35         struct inode *inode = filep->f_dentry->d_inode;
  36         int rc = -ENOTTY; /* strange error - but the precedent */
  37         int xid;
  38         struct cifs_sb_info *cifs_sb;
  39 #ifdef CONFIG_CIFS_POSIX
  40         __u64   ExtAttrBits = 0;
  41         __u64   ExtAttrMask = 0;
  42         __u64   caps;
  43         struct cifsTconInfo *tcon;
  44         struct cifsFileInfo *pSMBFile =
  45                 (struct cifsFileInfo *)filep->private_data;
  46 #endif /* CONFIG_CIFS_POSIX */
  47
  48         xid = GetXid();
  49
  50         cFYI(1, "ioctl file %p  cmd %u  arg %lu", filep, command, arg);
  51
  52         cifs_sb = CIFS_SB(inode->i_sb);
  53
  54 #ifdef CONFIG_CIFS_POSIX
  55         tcon = cifs_sb->tcon;
  56         if (tcon)
  57                 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
  58         else {
  59                 rc = -EIO;
  60                 FreeXid(xid);
  61                 return -EIO;
  62         }
  63 #endif /* CONFIG_CIFS_POSIX */
  64
  65         switch (command) {
  66                 case CIFS_IOC_CHECKUMOUNT:
  67                         cFYI(1, "User unmount attempted");
  68                         if (cifs_sb->mnt_uid == current_uid())
  69                                 rc = 0;
  70                         else {
  71                                 rc = -EACCES;
  72                                 cFYI(1, "uids do not match");
  73                         }
  74                         break;
  75 #ifdef CONFIG_CIFS_POSIX
  76                 case FS_IOC_GETFLAGS:
  77                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
  78                                 if (pSMBFile == NULL)
  79                                         break;
  80                                 rc = CIFSGetExtAttr(xid, tcon, pSMBFile->netfid,
  81                                         &ExtAttrBits, &ExtAttrMask);
  82                                 if (rc == 0)
  83                                         rc = put_user(ExtAttrBits &
  84                                                 FS_FL_USER_VISIBLE,
  85                                                 (int __user *)arg);
  86                         }
  87                         break;
  88
  89                 case FS_IOC_SETFLAGS:
  90                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
  91                                 if (get_user(ExtAttrBits, (int __user *)arg)) {
  92                                         rc = -EFAULT;
  93                                         break;
  94                                 }
  95                                 if (pSMBFile == NULL)
  96                                         break;
  97                                 /* rc= CIFSGetExtAttr(xid,tcon,pSMBFile->netfid,
  98                                         extAttrBits, &ExtAttrMask);*/
  99                         }
 100                         cFYI(1, "set flags not implemented yet");
 101                         break;
 102 #endif /* CONFIG_CIFS_POSIX */
 103                 default:
 104                         cFYI(1, "unsupported ioctl");
 105                         break;
 106         }
 107
 108         FreeXid(xid);
 109         return rc;
 110 }