root/fs/cifs/fcntl.c

DEFINITIONS

1. convert_to_cifs_notify_flags
2. cifs_dir_notify

/*
 *   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 = 0;
        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;
}