UML - Make hostfs_setattr() support operations on unlinked open files.

Index: linux-2.6.21-mm/fs/hostfs/hostfs.h
===================================================================
@@ -55,7 +55,7 @@ extern int stat_file(const char *path, u
 		     int *mode_out, int *nlink_out, int *uid_out, int *gid_out,
 		     unsigned long long *size_out, struct timespec *atime_out,
 		     struct timespec *mtime_out, struct timespec *ctime_out,
-		     int *blksize_out, unsigned long long *blocks_out);
+		     int *blksize_out, unsigned long long *blocks_out, int fd);
 extern int access_file(char *path, int r, int w, int x);
 extern int open_file(char *path, int r, int w, int append);
 extern int file_type(const char *path, int *maj, int *min);

@@ -71,7 +71,7 @@ extern int lseek_file(int fd, long long 
 extern int fsync_file(int fd, int datasync);
 extern int file_create(char *name, int ur, int uw, int ux, int gr,
 		       int gw, int gx, int or, int ow, int ox);
-extern int set_attr(const char *file, struct hostfs_iattr *attrs);
+extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
 extern int make_symlink(const char *from, const char *to);
 extern int unlink_file(const char *file);
 extern int do_mkdir(const char *file, int mode);

Index: linux-2.6.21-mm/fs/hostfs/hostfs_kern.c
===================================================================
@@ -147,7 +147,7 @@ static int read_name(struct inode *ino, 
 
 	err = stat_file(name, &i_ino, &i_mode, &i_nlink, &ino->i_uid,
 			&ino->i_gid, &i_size, &ino->i_atime, &ino->i_mtime,
-			&ino->i_ctime, &i_blksize, &i_blocks);
+			&ino->i_ctime, &i_blksize, &i_blocks, -1);
 	if(err)
 		return(err);
 

@@ -820,6 +820,8 @@ int hostfs_setattr(struct dentry *dentry
 	char *name;
 	int err;
 
+	int fd = HOSTFS_I(dentry->d_inode)->fd;
+
 	err = inode_change_ok(dentry->d_inode, attr);
 	if (err)
 		return err;

@@ -864,7 +866,7 @@ int hostfs_setattr(struct dentry *dentry
 	}
 	name = dentry_name(dentry, 0);
 	if(name == NULL) return(-ENOMEM);
-	err = set_attr(name, &attrs);
+	err = set_attr(name, &attrs, fd);
 	kfree(name);
 	if(err)
 		return(err);

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