original development tree for Linux kernel GTP module; now long in mainline.
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/*
* fs/cifs/fcntl.c
*
* vfs operations that deal with the file control API
*
* Copyright (C) International Business Machines Corp., 2003,2004
* Author(s): Steve French (sfrench@us.ibm.com)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifsfs.h"
static __u32 convert_to_cifs_notify_flags(unsigned long fcntl_notify_flags)
{
__u32 cifs_ntfy_flags = 0;
/* No way on Linux VFS to ask to monitor xattr
changes (and no stream support either */
if (fcntl_notify_flags & DN_ACCESS) {
cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
}
if (fcntl_notify_flags & DN_MODIFY) {
/* What does this mean on directories? */
cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_SIZE;
}
if (fcntl_notify_flags & DN_CREATE) {
cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_CREATION |
FILE_NOTIFY_CHANGE_LAST_WRITE;
}
if (fcntl_notify_flags & DN_DELETE) {
cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE;
}
if (fcntl_notify_flags & DN_RENAME) {
/* BB review this - checking various server behaviors */
cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_FILE_NAME;
}
if (fcntl_notify_flags & DN_ATTRIB) {
cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_SECURITY |
FILE_NOTIFY_CHANGE_ATTRIBUTES;
}
/* if (fcntl_notify_flags & DN_MULTISHOT) {
cifs_ntfy_flags |= ;
} */ /* BB fixme - not sure how to handle this with CIFS yet */
return cifs_ntfy_flags;
}
int cifs_dir_notify(struct file * file, unsigned long arg)
{
int xid;
int rc = -EINVAL;
int oplock = FALSE;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
char *full_path = NULL;
__u32 filter = FILE_NOTIFY_CHANGE_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES;
__u16 netfid;
if (experimEnabled == 0)
return 0;
xid = GetXid();
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
pTcon = cifs_sb->tcon;
full_path = build_path_from_dentry(file->f_path.dentry);
if (full_path == NULL) {
rc = -ENOMEM;
} else {
cFYI(1, ("dir notify on file %s Arg 0x%lx", full_path, arg));
rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
GENERIC_READ | SYNCHRONIZE, 0 /* create options */,
&netfid, &oplock, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
/* BB fixme - add this handle to a notify handle list */
if (rc) {
cFYI(1, ("Could not open directory for notify"));
} else {
filter = convert_to_cifs_notify_flags(arg);
if (filter != 0) {
rc = CIFSSMBNotify(xid, pTcon,
0 /* no subdirs */, netfid,
filter, file, arg & DN_MULTISHOT,
cifs_sb->local_nls);
} else {
rc = -EINVAL;
}
/* BB add code to close file eventually (at unmount
it would close automatically but may be a way
to do it easily when inode freed or when
notify info is cleared/changed */
cFYI(1, ("notify rc %d", rc));
}
}
FreeXid(xid);
return rc;
}