fs/ext3/ialloc.c        |   40 ++++++++++++++++++++++++++++++++++++++--
 fs/ext3/inode.c         |    2 +-
 fs/ext3/ioctl.c         |   25 +++++++++++++++++++++++++
 fs/ext3/namei.c         |   21 +++++++++++++++++----
 include/linux/dcache.h  |    5 +++++
 include/linux/ext3_fs.h |    5 ++++-
 6 files changed, 90 insertions(+), 8 deletions(-)

Index: linux-2.4.21-chaos/fs/ext3/namei.c
===================================================================
--- linux-2.4.21-chaos.orig/fs/ext3/namei.c	2003-12-12 16:18:41.000000000 +0300
+++ linux-2.4.21-chaos/fs/ext3/namei.c	2003-12-12 16:18:53.000000000 +0300
@@ -1534,6 +1534,19 @@
 	return err;
 }
 
+static struct inode * ext3_new_inode_wantedi(handle_t *handle, struct inode *dir,
+						int mode, struct dentry *dentry)
+{
+	unsigned long inum = 0;
+
+	if (dentry->d_fsdata != NULL) {
+		struct dentry_params *param =
+			(struct dentry_params *) dentry->d_fsdata;
+		inum = param->p_inum;
+	}
+	return ext3_new_inode(handle, dir, mode, inum);
+}
+
 /*
  * By the time this is called, we already have created
  * the directory cache entry for the new file, but it
@@ -1557,7 +1570,7 @@
 	if (IS_SYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, mode);
+	inode = ext3_new_inode_wantedi (handle, dir, mode, dentry);
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
 		inode->i_op = &ext3_file_inode_operations;
@@ -1585,7 +1598,7 @@
 	if (IS_SYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, mode);
+	inode = ext3_new_inode_wantedi (handle, dir, mode, dentry);
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
 		init_special_inode(inode, inode->i_mode, rdev);
@@ -1618,7 +1631,7 @@
 	if (IS_SYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, S_IFDIR | mode);
+	inode = ext3_new_inode_wantedi (handle, dir, S_IFDIR | mode, dentry);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
 		goto out_stop;
@@ -2012,7 +2025,7 @@
 	if (IS_SYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, S_IFLNK|S_IRWXUGO);
+	inode = ext3_new_inode_wantedi (handle, dir, S_IFLNK|S_IRWXUGO, dentry);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
 		goto out_stop;
Index: linux-2.4.21-chaos/fs/ext3/ialloc.c
===================================================================
--- linux-2.4.21-chaos.orig/fs/ext3/ialloc.c	2003-12-12 16:18:52.000000000 +0300
+++ linux-2.4.21-chaos/fs/ext3/ialloc.c	2003-12-12 16:18:53.000000000 +0300
@@ -330,7 +330,8 @@
  * For other inodes, search forward from the parent directory's block
  * group to find a free inode.
  */
-struct inode * ext3_new_inode (handle_t *handle, struct inode * dir, int mode)
+struct inode * ext3_new_inode(handle_t *handle, const struct inode * dir,
+			      int mode, unsigned long goal)
 {
 	struct super_block * sb;
 	struct buffer_head * bh;
@@ -359,7 +360,41 @@
 	init_rwsem(&ei->truncate_sem);
 
 	lock_super (sb);
-	es = sbi->s_es;
+	es = EXT3_SB(sb)->s_es;
+
+	if (goal) {
+		i = (goal - 1) / EXT3_INODES_PER_GROUP(sb);
+		j = (goal - 1) % EXT3_INODES_PER_GROUP(sb);
+		gdp = ext3_get_group_desc(sb, i, &bh2);
+
+		bitmap_nr = load_inode_bitmap (sb, i);
+		if (bitmap_nr < 0) {
+			err = bitmap_nr;
+			goto fail;
+		}
+
+		bh = EXT3_SB(sb)->s_inode_bitmap[bitmap_nr];
+
+		BUFFER_TRACE(bh, "get_write_access");
+		err = ext3_journal_get_write_access(handle, bh);
+		if (err) goto fail;
+
+		if (ext3_set_bit(j, bh->b_data)) {
+			printk(KERN_ERR "goal inode %lu unavailable\n", goal);
+			/* Oh well, we tried. */
+			goto repeat;
+		}
+
+		BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
+		err = ext3_journal_dirty_metadata(handle, bh);
+		if (err) goto fail;
+
+		/* We've shortcircuited the allocation system successfully,
+		 * now finish filling in the inode.
+		 */
+		goto have_bit_and_group;
+	}
+
 repeat:
 	gdp = NULL;
 	i = 0;
@@ -474,6 +509,7 @@
 		}
 		goto repeat;
 	}
+ have_bit_and_group:
 	j += i * EXT3_INODES_PER_GROUP(sb) + 1;
 	if (j < EXT3_FIRST_INO(sb) || j > le32_to_cpu(es->s_inodes_count)) {
 		ext3_error (sb, "ext3_new_inode",
Index: linux-2.4.21-chaos/fs/ext3/inode.c
===================================================================
--- linux-2.4.21-chaos.orig/fs/ext3/inode.c	2003-12-12 16:18:52.000000000 +0300
+++ linux-2.4.21-chaos/fs/ext3/inode.c	2003-12-12 16:18:53.000000000 +0300
@@ -2233,7 +2233,7 @@
 	if (IS_ERR(handle))
 		goto out_truncate;
 
-	new_inode = ext3_new_inode(handle, old_inode, old_inode->i_mode);
+	new_inode = ext3_new_inode(handle, old_inode, old_inode->i_mode, 0);
 	if (IS_ERR(new_inode)) {
 		ext3_debug("truncate inode %lu directly (no new inodes)\n",
 			   old_inode->i_ino);
Index: linux-2.4.21-chaos/fs/ext3/ioctl.c
===================================================================
--- linux-2.4.21-chaos.orig/fs/ext3/ioctl.c	2003-12-12 16:18:40.000000000 +0300
+++ linux-2.4.21-chaos/fs/ext3/ioctl.c	2003-12-12 16:18:53.000000000 +0300
@@ -24,6 +24,31 @@
 	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
 
 	switch (cmd) {
+	case EXT3_IOC_CREATE_INUM: {
+		char name[32];
+		struct dentry *dchild, *dparent;
+		int rc = 0;
+
+		dparent = list_entry(inode->i_dentry.next, struct dentry,
+				     d_alias);
+		snprintf(name, sizeof name, "%lu", arg);
+		dchild = lookup_one_len(name, dparent, strlen(name));
+		if (dchild->d_inode) {
+			printk(KERN_ERR "%*s/%lu already exists (ino %lu)\n",
+			       dparent->d_name.len, dparent->d_name.name, arg,
+			       dchild->d_inode->i_ino);
+			rc = -EEXIST;
+		} else {
+			dchild->d_fsdata = (void *)arg;
+			rc = vfs_create(inode, dchild, 0644);
+			if (rc)
+				printk(KERN_ERR "vfs_create: %d\n", rc);
+			else if (dchild->d_inode->i_ino != arg)
+				rc = -EEXIST;
+		}
+		dput(dchild);
+		return rc;
+	}
 	case EXT3_IOC_GETFLAGS:
 		flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
 		return put_user(flags, (int *) arg);
Index: linux-2.4.21-chaos/include/linux/ext3_fs.h
===================================================================
--- linux-2.4.21-chaos.orig/include/linux/ext3_fs.h	2003-12-12 16:18:52.000000000 +0300
+++ linux-2.4.21-chaos/include/linux/ext3_fs.h	2003-12-12 16:18:53.000000000 +0300
@@ -204,6 +204,7 @@
 #define	EXT3_IOC_SETFLAGS		_IOW('f', 2, long)
 #define	EXT3_IOC_GETVERSION		_IOR('f', 3, long)
 #define	EXT3_IOC_SETVERSION		_IOW('f', 4, long)
+/* EXT3_IOC_CREATE_INUM at bottom of file (visible to kernel and user). */
 #define	EXT3_IOC_GETVERSION_OLD		_IOR('v', 1, long)
 #define	EXT3_IOC_SETVERSION_OLD		_IOW('v', 2, long)
 #ifdef CONFIG_JBD_DEBUG
@@ -671,7 +672,8 @@
 			  dx_hash_info *hinfo);
 
 /* ialloc.c */
-extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
+extern struct inode * ext3_new_inode (handle_t *, const struct inode *, int,
+				      unsigned long);
 extern void ext3_free_inode (handle_t *, struct inode *);
 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 extern unsigned long ext3_count_free_inodes (struct super_block *);
@@ -763,4 +765,5 @@
 
 #endif	/* __KERNEL__ */
 
+#define EXT3_IOC_CREATE_INUM			_IOW('f', 5, long)
 #endif	/* _LINUX_EXT3_FS_H */
Index: linux-2.4.21-chaos/include/linux/dcache.h
===================================================================
--- linux-2.4.21-chaos.orig/include/linux/dcache.h	2003-12-12 16:18:06.000000000 +0300
+++ linux-2.4.21-chaos/include/linux/dcache.h	2003-12-12 16:18:53.000000000 +0300
@@ -63,6 +63,11 @@
 
 #define IS_ROOT(x) ((x) == (x)->d_parent)
 
+struct dentry_params {
+	unsigned long   p_inum;
+	void            *p_ptr;
+};
+
 /*
  * "quick string" -- eases parameter passing, but more importantly
  * saves "metadata" about the string (ie length and the hash).