Add in cifs fcntl handling to fix remote dnotify problem

fs/cifs/CHANGES

+Version 1.09
+------------
+Fix /proc/fs module unload warning message (that could be logged
+to the kernel log)
+
 Version 1.08
 ------------
 Allow file_mode and dir_mode (specified at mount time) to be enforced

fs/cifs/Makefile

@@ -3,4 +3,4 @@
 #
 obj-$(CONFIG_CIFS) += cifs.o
 
-cifs-objs := cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o inode.o link.o misc.o netmisc.o smbdes.o smbencrypt.o transport.o asn1.o md4.o md5.o cifs_unicode.o nterr.o xattr.o cifsencrypt.o
+cifs-objs := cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o inode.o link.o misc.o netmisc.o smbdes.o smbencrypt.o transport.o asn1.o md4.o md5.o cifs_unicode.o nterr.o xattr.o cifsencrypt.o fcntl.o

fs/cifs/cifsfs.c

 /*
  *   fs/cifs/cifsfs.c
  *
- *   Copyright (C) International Business Machines  Corp., 2002,2003
+ *   Copyright (C) International Business Machines  Corp., 2002,2004
  *   Author(s): Steve French (sfrench@us.ibm.com)
  *
  *   Common Internet FileSystem (CIFS) client
@@ -537,12 +537,18 @@ struct file_operations cifs_file_ops = {
 	.flush = cifs_flush,
 	.mmap  = cifs_file_mmap,
 	.sendfile = generic_file_sendfile,
+#ifdef CIFS_FCNTL
+	.fcntl = cifs_fcntl,
+#endif
 };
 
 struct file_operations cifs_dir_ops = {
 	.readdir = cifs_readdir,
 	.release = cifs_closedir,
 	.read    = generic_read_dir,
+#ifdef CIFS_FCNTL
+	.fcntl   = cifs_fcntl,
+#endif
 };
 
 static void

fs/cifs/cifsfs.h

@@ -78,6 +78,7 @@ extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
 extern struct file_operations cifs_dir_ops;
 extern int cifs_dir_open(struct inode *inode, struct file *file);
 extern int cifs_readdir(struct file *file, void *direntry, filldir_t filldir);
+extern long cifs_fcntl(int, unsigned int, unsigned long, struct file *);
 
 /* Functions related to dir entries */
 extern struct dentry_operations cifs_dentry_ops;

fs/cifs/fcntl.c

+/*
+ *   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"
+
+int cifs_directory_notify(unsigned long arg, struct file * file)
+{
+	int xid;
+	int rc = -EINVAL;
+	struct cifs_sb_info *cifs_sb;
+	struct cifsTconInfo *pTcon;
+	char *full_path = NULL;
+
+	xid = GetXid();
+	cifs_sb = CIFS_SB(file->f_dentry->d_sb);
+	pTcon = cifs_sb->tcon;
+	full_path = build_path_from_dentry(file->f_dentry);
+	cFYI(1,("cifs dir notify on file %s",full_path));
+	/* CIFSSMBNotify */
+	FreeXid(xid);
+	return rc;
+}
+
+
+long cifs_fcntl(int file_desc, unsigned int command, unsigned long arg,
+				struct file * file)
+{
+	/* Few few file control functions need to be specially mapped. So far
+	only:
+		F_NOTIFY (for directory change notification)
+	And eventually:
+		F_GETLEASE
+		F_SETLEASE 
+	need to be mapped here. The others either already are mapped downstream
+	or do not need to go to the server (client only sideeffects):
+		F_DUPFD:
+		F_GETFD:
+		F_SETFD:
+		F_GETFL:
+		F_SETFL:
+		F_GETLK:
+		F_SETLK:
+		F_SETLKW:
+		F_GETOWN:
+		F_SETOWN:
+		F_GETSIG:
+		F_SETSIG:
+	*/
+	long rc = 0;
+
+	cFYI(1,("cifs_fcntl: command %d with arg %lx",command,arg)); /* BB removeme BB */
+
+	switch (command) {
+	case F_NOTIFY:
+		/* let the local call have a chance to fail first */
+		rc = generic_file_fcntl(file_desc,command,arg,file);
+		if(rc)
+			return rc;
+		else {
+			/* local call succeeded try to do remote notify to
+			pick up changes from other clients to server file */
+			cifs_directory_notify(arg, file);
+			/* BB add case to long and return rc from above */
+			return rc;
+		}
+		break;
+	default:
+		break;
+	}
+	return generic_file_fcntl(file_desc,command,arg,file);
+}
+