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         unsigned int xid;
  38         struct cifs_sb_info *cifs_sb;
  39 #ifdef CONFIG_CIFS_POSIX
  40         struct cifsFileInfo *pSMBFile = filep->private_data;
  41         struct cifs_tcon *tcon;
  42         __u64   ExtAttrBits = 0;
  43         __u64   ExtAttrMask = 0;
  44         __u64   caps;
  45 #endif /* CONFIG_CIFS_POSIX */
  46
  47         xid = get_xid();
  48
  49         cFYI(1, "ioctl file %p  cmd %u  arg %lu", filep, command, arg);
  50
  51         cifs_sb = CIFS_SB(inode->i_sb);
  52
  53         switch (command) {
  54                 static bool warned = false;
  55                 case CIFS_IOC_CHECKUMOUNT:
  56                         if (!warned) {
  57                                 warned = true;
  58                                 cERROR(1, "the CIFS_IOC_CHECKMOUNT ioctl will "
  59                                           "be deprecated in 3.7. Please "
  60                                           "migrate away from the use of "
  61                                           "umount.cifs");
  62                         }
  63                         cFYI(1, "User unmount attempted");
  64                         if (cifs_sb->mnt_uid == current_uid())
  65                                 rc = 0;
  66                         else {
  67                                 rc = -EACCES;
  68                                 cFYI(1, "uids do not match");
  69                         }
  70                         break;
  71 #ifdef CONFIG_CIFS_POSIX
  72                 case FS_IOC_GETFLAGS:
  73                         if (pSMBFile == NULL)
  74                                 break;
  75                         tcon = tlink_tcon(pSMBFile->tlink);
  76                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
  77                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
  78                                 rc = CIFSGetExtAttr(xid, tcon, pSMBFile->netfid,
  79                                         &ExtAttrBits, &ExtAttrMask);
  80                                 if (rc == 0)
  81                                         rc = put_user(ExtAttrBits &
  82                                                 FS_FL_USER_VISIBLE,
  83                                                 (int __user *)arg);
  84                         }
  85                         break;
  86
  87                 case FS_IOC_SETFLAGS:
  88                         if (pSMBFile == NULL)
  89                                 break;
  90                         tcon = tlink_tcon(pSMBFile->tlink);
  91                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
  92                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
  93                                 if (get_user(ExtAttrBits, (int __user *)arg)) {
  94                                         rc = -EFAULT;
  95                                         break;
  96                                 }
  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         free_xid(xid);
 109         return rc;
 110 }