fs/ext3/ialloc.c        |   35 ++++++++++++++++++++++++++++++++++-
 fs/ext3/ioctl.c         |   25 +++++++++++++++++++++++++
 fs/ext3/namei.c         |   21 +++++++++++++++++----
 include/linux/dcache.h  |    5 +++++
 include/linux/ext3_fs.h |    5 ++++-
 5 files changed, 85 insertions(+), 6 deletions(-)

Index: linux-2.6.15/fs/ext3/ialloc.c
===================================================================
--- linux-2.6.15.orig/fs/ext3/ialloc.c	2006-02-19 15:23:12.000000000 +0300
+++ linux-2.6.15/fs/ext3/ialloc.c	2006-02-21 00:26:52.000000000 +0300
@@ -420,7 +420,8 @@ static int find_group_other(struct super
  * 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, struct inode * dir, int mode,
+				unsigned long goal)
 {
 	struct super_block *sb;
 	struct buffer_head *bitmap_bh = NULL;
@@ -448,6 +449,38 @@ struct inode *ext3_new_inode(handle_t *h
 
 	sbi = EXT3_SB(sb);
 	es = sbi->s_es;
+	if (goal) {
+		group = (goal - 1) / EXT3_INODES_PER_GROUP(sb);
+		ino = (goal - 1) % EXT3_INODES_PER_GROUP(sb);
+		gdp = ext3_get_group_desc(sb, group, &bh2);
+
+		err = -EIO;
+		bitmap_bh = read_inode_bitmap (sb, group);
+		if (!bitmap_bh)
+			goto fail;
+
+		BUFFER_TRACE(bh, "get_write_access");
+		err = ext3_journal_get_write_access(handle, bitmap_bh);
+		if (err) goto fail;
+
+		if (ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
+					ino, bitmap_bh->b_data)) {
+			printk(KERN_ERR "goal inode %lu unavailable\n", goal);
+			/* Oh well, we tried. */
+			goto continue_allocation;
+		}
+
+		BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
+		err = ext3_journal_dirty_metadata(handle, bitmap_bh);
+		if (err) goto fail;
+
+		/* We've shortcircuited the allocation system successfully,
+		 * now finish filling in the inode.
+		 */
+		goto got;
+	}
+
+continue_allocation:
 	if (S_ISDIR(mode)) {
 		if (test_opt (sb, OLDALLOC))
 			group = find_group_dir(sb, dir);
Index: linux-2.6.15/fs/ext3/ioctl.c
===================================================================
--- linux-2.6.15.orig/fs/ext3/ioctl.c	2005-11-11 08:33:12.000000000 +0300
+++ linux-2.6.15/fs/ext3/ioctl.c	2006-02-21 00:26:52.000000000 +0300
@@ -25,6 +25,31 @@ int ext3_ioctl (struct inode * inode, st
 	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, NULL);
+			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 __user *) arg);
Index: linux-2.6.15/fs/ext3/namei.c
===================================================================
--- linux-2.6.15.orig/fs/ext3/namei.c	2006-02-19 15:23:12.000000000 +0300
+++ linux-2.6.15/fs/ext3/namei.c	2006-02-21 00:28:17.000000000 +0300
@@ -1631,6 +1631,16 @@ static int ext3_add_nondir(handle_t *han
 	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)
+		inum = (unsigned long) dentry->d_fsdata;
+	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
@@ -1656,7 +1666,7 @@ retry:
 	if (IS_DIRSYNC(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;
@@ -1690,7 +1700,7 @@ retry:
 	if (IS_DIRSYNC(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);
@@ -1726,7 +1736,7 @@ retry:
 	if (IS_DIRSYNC(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;
@@ -2131,7 +2141,7 @@ retry:
 	if (IS_DIRSYNC(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-2.6.15/include/linux/ext3_fs.h
===================================================================
--- linux-2.6.15.orig/include/linux/ext3_fs.h	2005-11-11 08:33:12.000000000 +0300
+++ linux-2.6.15/include/linux/ext3_fs.h	2006-02-21 00:26:52.000000000 +0300
@@ -762,7 +762,8 @@ extern int ext3fs_dirhash(const char *na
 			  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 *, 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 *);
@@ -844,4 +845,6 @@ extern struct inode_operations ext3_fast
 
 #endif	/* __KERNEL__ */
 
+/* EXT3_IOC_CREATE_INUM at bottom of file (visible to kernel and user). */
+#define EXT3_IOC_CREATE_INUM			_IOW('f', 5, long)
 #endif	/* _LINUX_EXT3_FS_H */