--- /usr/src/linux-2.4.16/fs/reiserfs/file.c.obd-orig	Thu Dec 13 14:35:00 2001
+++ /usr/src/linux-2.4.16/fs/reiserfs/file.c	Thu Dec 13 14:35:08 2001
@@ -28,8 +28,8 @@
     struct reiserfs_transaction_handle th ;
     int windex ;
 
-    if (!S_ISREG (inode->i_mode))
-	BUG ();
+    //if (!S_ISREG (inode->i_mode))
+    //BUG ();
 
     /* fast out for when nothing needs to be done */
     if ((atomic_read(&inode->i_count) > 1 ||
--- /usr/src/linux-2.4.16/fs/namespace.c.obd-orig	Tue Dec 11 20:44:15 2001
+++ /usr/src/linux-2.4.16/fs/namespace.c	Tue Dec 11 20:44:35 2001
@@ -332,7 +332,7 @@
 	}
 }
 
-static int do_umount(struct vfsmount *mnt, int flags)
+int do_umount(struct vfsmount *mnt, int flags)
 {
 	struct super_block * sb = mnt->mnt_sb;
 	int retval = 0;
--- /usr/src/linux-2.4.16/kernel/ksyms.c.obd-orig	Tue Dec 11 14:22:09 2001
+++ /usr/src/linux-2.4.16/kernel/ksyms.c	Tue Dec 11 18:05:30 2001
@@ -268,6 +268,7 @@
 EXPORT_SYMBOL(__pollwait);
 EXPORT_SYMBOL(poll_freewait);
 EXPORT_SYMBOL(ROOT_DEV);
+EXPORT_SYMBOL(pagecache_lock);
 EXPORT_SYMBOL(__find_get_page);
 EXPORT_SYMBOL(__find_lock_page);
 EXPORT_SYMBOL(grab_cache_page);
--- /usr/src/linux-2.4.16/mm/filemap.c.obd-orig	Mon Nov 26 06:29:17 2001
+++ /usr/src/linux-2.4.16/mm/filemap.c	Tue Dec 11 14:29:50 2001
@@ -2846,8 +2846,7 @@
  * file system has to do this all by itself, unfortunately.
  *							okir@monad.swb.de
  */
-ssize_t
-generic_file_write(struct file *file,const char *buf,size_t count, loff_t *ppos)
+ssize_t do_generic_file_write(struct file *file,const char *buf,size_t count,loff_t *ppos, int (*actor)(char *, char *, size_t ))
 {
 	struct address_space *mapping = file->f_dentry->d_inode->i_mapping;
 	struct inode	*inode = mapping->host;
@@ -2862,8 +2861,10 @@
 	if ((ssize_t) count < 0)
 		return -EINVAL;
 
+#if 0
 	if (!access_ok(VERIFY_READ, buf, count))
 		return -EFAULT;
+#endif
 
 	cached_page = NULL;
 
@@ -2987,10 +2988,12 @@
 		 * same page as we're writing to, without it being marked
 		 * up-to-date.
 		 */
+#if 0
 		{ volatile unsigned char dummy;
 			__get_user(dummy, buf);
 			__get_user(dummy, buf+bytes-1);
 		}
+#endif
 
 		status = -ENOMEM;	/* we'll assign it later anyway */
 		page = __grab_cache_page(mapping, index, &cached_page);
@@ -3006,7 +3009,7 @@
 		status = mapping->a_ops->prepare_write(file, page, offset, offset+bytes);
 		if (status)
 			goto unlock;
-		page_fault = __copy_from_user(kaddr+offset, buf, bytes);
+		page_fault = actor(kaddr+offset, buf, bytes);
 		flush_dcache_page(page);
 		status = mapping->a_ops->commit_write(file, page, offset, offset+bytes);
 		if (page_fault)
@@ -3072,6 +3075,23 @@
 	goto out_status;
 }
 
+
+static inline int actor_from_user(char *dst, char *src, size_t len)
+{
+	if (!access_ok(VERIFY_READ, src, len))
+		return -EFAULT;
+		
+	return __copy_from_user(dst, src, len);
+}
+
+ssize_t
+generic_file_write(struct file *file,const char *buf,size_t count,loff_t *ppos)
+{
+	return do_generic_file_write(file, buf, count, ppos, &actor_from_user);
+}
+
+
+
 void __init page_cache_init(unsigned long mempages)
 {
 	unsigned long htable_size, order;
--- /usr/src/linux-2.4.16/include/linux/fs.h.obd-orig	Tue Dec 11 14:23:29 2001
+++ /usr/src/linux-2.4.16/include/linux/fs.h	Tue Dec 11 20:45:00 2001
@@ -978,8 +978,10 @@
 extern int register_filesystem(struct file_system_type *);
 extern int unregister_filesystem(struct file_system_type *);
 extern struct vfsmount *kern_mount(struct file_system_type *);
+struct vfsmount *do_kern_mount(char *type, int flags, char *name, void *data);
 extern int may_umount(struct vfsmount *);
 extern long do_mount(char *, char *, char *, unsigned long, void *);
+int do_umount(struct vfsmount *mnt, int flags);
 
 #define kern_umount mntput
 
@@ -1044,6 +1046,35 @@
 
 asmlinkage long sys_open(const char *, int, int);
 asmlinkage long sys_close(unsigned int);	/* yes, it's really unsigned */
+asmlinkage ssize_t sys_read(unsigned int fd, char * buf, size_t count);
+asmlinkage ssize_t sys_write(unsigned int fd, const char * buf, size_t count);
+asmlinkage long sys_truncate64(const char * path, loff_t length);
+asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length);
+asmlinkage long sys_mount(char * dev_name, char * dir_name, char * type,
+			  unsigned long flags, void * data);
+asmlinkage long sys_umount(char * name, int flags);
+asmlinkage long sys_stat(char * filename, struct __old_kernel_stat * statbuf);
+asmlinkage long sys_mknod(const char * filename, int mode, dev_t dev);
+asmlinkage long sys_mkdir(const char * pathname, int mode);
+asmlinkage long sys_rmdir(const char * pathname);
+asmlinkage long sys_unlink(const char * pathname);
+asmlinkage long sys_symlink(const char * oldname, const char * newname);
+asmlinkage long sys_link(const char * oldname, const char * newname);
+asmlinkage long sys_rename(const char * oldname, const char * newname);
+asmlinkage long sys_lstat64(char * filename, struct stat64 * statbuf, long flags);
+asmlinkage long sys_stat64(char * filename, struct stat64 * statbuf, long flags);
+asmlinkage long sys_fstat64(unsigned long fd, struct stat64 * statbuf, long flags);
+
+
+
+
+
+
+
+
+
+
+
 extern int do_truncate(struct dentry *, loff_t start);
 
 extern struct file *filp_open(const char *, int, int);
@@ -1395,6 +1426,8 @@
 extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
 extern ssize_t generic_file_write(struct file *, const char *, size_t, loff_t *);
 extern void do_generic_file_read(struct file *, loff_t *, read_descriptor_t *, read_actor_t);
+ssize_t do_generic_file_write(struct file *file,const char *buf,size_t count,loff_t *ppos, int (*actor)(char *, char *, size_t ));
+
 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
 extern ssize_t generic_read_dir(struct file *, char *, size_t, loff_t *);