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., 2005,2013
   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 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
  32 {
  33         struct inode *inode = file_inode(filep);
  34         int rc = -ENOTTY; /* strange error - but the precedent */
  35         unsigned int xid;
  36         struct cifs_sb_info *cifs_sb;
  37         struct cifsFileInfo *pSMBFile = filep->private_data;
  38         struct cifs_tcon *tcon;
  39         __u64   ExtAttrBits = 0;
  40         __u64   caps;
  41
  42         xid = get_xid();
  43
  44         cifs_dbg(FYI, "ioctl file %p  cmd %u  arg %lu\n", filep, command, arg);
  45
  46         cifs_sb = CIFS_SB(inode->i_sb);
  47
  48         switch (command) {
  49                 case FS_IOC_GETFLAGS:
  50                         if (pSMBFile == NULL)
  51                                 break;
  52                         tcon = tlink_tcon(pSMBFile->tlink);
  53                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
  54 #ifdef CONFIG_CIFS_POSIX
  55                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
  56                                 __u64   ExtAttrMask = 0;
  57                                 rc = CIFSGetExtAttr(xid, tcon,
  58                                                     pSMBFile->fid.netfid,
  59                                                     &ExtAttrBits, &ExtAttrMask);
  60                                 if (rc == 0)
  61                                         rc = put_user(ExtAttrBits &
  62                                                 FS_FL_USER_VISIBLE,
  63                                                 (int __user *)arg);
  64                                 if (rc != EOPNOTSUPP)
  65                                         break;
  66                         }
  67 #endif /* CONFIG_CIFS_POSIX */
  68                         rc = 0;
  69                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
  70                                 /* add in the compressed bit */
  71                                 ExtAttrBits = FS_COMPR_FL;
  72                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
  73                                               (int __user *)arg);
  74                         }
  75                         break;
  76                 case FS_IOC_SETFLAGS:
  77                         if (pSMBFile == NULL)
  78                                 break;
  79                         tcon = tlink_tcon(pSMBFile->tlink);
  80                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
  81
  82                         if (get_user(ExtAttrBits, (int __user *)arg)) {
  83                                 rc = -EFAULT;
  84                                 break;
  85                         }
  86
  87                         /*
  88                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
  89                          *      rc = CIFSSetExtAttr(xid, tcon,
  90                          *                     pSMBFile->fid.netfid,
  91                          *                     extAttrBits,
  92                          *                     &ExtAttrMask);
  93                          * if (rc != EOPNOTSUPP)
  94                          *      break;
  95                          */
  96
  97                         /* Currently only flag we can set is compressed flag */
  98                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
  99                                 break;
 100
 101                         /* Try to set compress flag */
 102                         if (tcon->ses->server->ops->set_compression) {
 103                                 rc = tcon->ses->server->ops->set_compression(
 104                                                         xid, tcon, pSMBFile);
 105                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 106                         }
 107                         break;
 108                 default:
 109                         cifs_dbg(FYI, "unsupported ioctl\n");
 110                         break;
 111         }
 112
 113         free_xid(xid);
 114         return rc;
 115 }