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