fs/cifs/fcntl.c

   1 /*
   2  *   fs/cifs/fcntl.c
   3  *
   4  *   vfs operations that deal with the file control API
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2003,2004
   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 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/fcntl.h>
  26 #include "cifsglob.h"
  27 #include "cifsproto.h"
  28 #include "cifs_unicode.h"
  29 #include "cifs_debug.h"
  30 #include "cifsfs.h"
  31
  32 static __u32 convert_to_cifs_notify_flags(unsigned long fcntl_notify_flags)
  33 {
  34         __u32 cifs_ntfy_flags = 0;
  35
  36         /* No way on Linux VFS to ask to monitor xattr
  37         changes (and no stream support either */
  38         if (fcntl_notify_flags & DN_ACCESS) {
  39                 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
  40         }
  41         if (fcntl_notify_flags & DN_MODIFY) {
  42                 /* What does this mean on directories? */
  43                 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE |
  44                         FILE_NOTIFY_CHANGE_SIZE;
  45         }
  46         if (fcntl_notify_flags & DN_CREATE) {
  47                 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_CREATION |
  48                         FILE_NOTIFY_CHANGE_LAST_WRITE;
  49         }
  50         if (fcntl_notify_flags & DN_DELETE) {
  51                 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE;
  52         }
  53         if (fcntl_notify_flags & DN_RENAME) {
  54                 /* BB review this - checking various server behaviors */
  55                 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_DIR_NAME |
  56                         FILE_NOTIFY_CHANGE_FILE_NAME;
  57         }
  58         if (fcntl_notify_flags & DN_ATTRIB) {
  59                 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_SECURITY |
  60                         FILE_NOTIFY_CHANGE_ATTRIBUTES;
  61         }
  62 /*      if (fcntl_notify_flags & DN_MULTISHOT) {
  63                 cifs_ntfy_flags |= ;
  64         } */ /* BB fixme - not sure how to handle this with CIFS yet */
  65
  66         return cifs_ntfy_flags;
  67 }
  68
  69 int cifs_dir_notify(struct file * file, unsigned long arg)
  70 {
  71         int xid;
  72         int rc = -EINVAL;
  73         int oplock = FALSE;
  74         struct cifs_sb_info *cifs_sb;
  75         struct cifsTconInfo *pTcon;
  76         char *full_path = NULL;
  77         __u32 filter = FILE_NOTIFY_CHANGE_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES;
  78         __u16 netfid;
  79
  80         if (experimEnabled == 0)
  81                 return 0;
  82
  83         xid = GetXid();
  84         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
  85         pTcon = cifs_sb->tcon;
  86
  87         full_path = build_path_from_dentry(file->f_path.dentry);
  88
  89         if (full_path == NULL) {
  90                 rc = -ENOMEM;
  91         } else {
  92                 cFYI(1, ("dir notify on file %s Arg 0x%lx", full_path, arg));
  93                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
  94                         GENERIC_READ | SYNCHRONIZE, 0 /* create options */,
  95                         &netfid, &oplock, NULL, cifs_sb->local_nls,
  96                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
  97                 /* BB fixme - add this handle to a notify handle list */
  98                 if (rc) {
  99                         cFYI(1, ("Could not open directory for notify"));
 100                 } else {
 101                         filter = convert_to_cifs_notify_flags(arg);
 102                         if (filter != 0) {
 103                                 rc = CIFSSMBNotify(xid, pTcon,
 104                                         0 /* no subdirs */, netfid,
 105                                         filter, file, arg & DN_MULTISHOT,
 106                                         cifs_sb->local_nls);
 107                         } else {
 108                                 rc = -EINVAL;
 109                         }
 110                         /* BB add code to close file eventually (at unmount
 111                         it would close automatically but may be a way
 112                         to do it easily when inode freed or when
 113                         notify info is cleared/changed */
 114                         cFYI(1, ("notify rc %d", rc));
 115                 }
 116         }
 117
 118         FreeXid(xid);
 119         return rc;
 120 }