From b199291909e5951b74c9ad43163b5022a329dc26 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 31 Aug 2016 18:13:16 -0400
Subject: [PATCH] debugfs: add the debugfs copy_inode subcommand

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 debugfs/debug_cmds.ct |  3 +++
 debugfs/debugfs.8.in  |  6 ++++++
 debugfs/debugfs.c     | 29 +++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/debugfs/debug_cmds.ct b/debugfs/debug_cmds.ct
index 34dad9e6..1ff6c9dc 100644
--- a/debugfs/debug_cmds.ct
+++ b/debugfs/debug_cmds.ct
@@ -73,6 +73,9 @@ request do_rm, "Remove a file (unlink and kill_file, if appropriate)",
 request do_kill_file, "Deallocate an inode and its blocks",
 	kill_file;
 
+request do_copy_inode, "Copy the inode structure",
+	copy_inode;
+
 request do_clri, "Clear an inode's contents",
 	clri;
 
diff --git a/debugfs/debugfs.8.in b/debugfs/debugfs.8.in
index e85034ab..e151d43a 100644
--- a/debugfs/debugfs.8.in
+++ b/debugfs/debugfs.8.in
@@ -225,6 +225,12 @@ master superblock.
 Clear the contents of the inode
 .IR filespec .
 .TP
+.BI copy_inode " source_inode destination_inode"
+Copy the conents of the inode structure in
+.I source_inode
+and use it to overwrite the inode structure at
+.IR destination_inode .
+.TP
 .BI dirsearch " filespec filename"
 Search the directory
 .I filespec
diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index b2b06fe6..f25ab1e4 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -1584,6 +1584,35 @@ void do_unlink(int argc, char *argv[])
 
 	unlink_file_by_name(argv[1]);
 }
+
+void do_copy_inode(int argc, char *argv[])
+{
+	ext2_ino_t	src_ino, dest_ino;
+	struct ext2_inode inode;
+	unsigned char	buf[4096];
+	int		retval;
+
+	if (common_args_process(argc, argv, 3, 3, "copy_inode",
+				"<source file> <dest_name>", CHECK_FS_RW))
+		return;
+
+	src_ino = string_to_inode(argv[1]);
+	if (!src_ino)
+		return;
+
+	dest_ino = string_to_inode(argv[2]);
+	if (!dest_ino)
+		return;
+
+	if (debugfs_read_inode_full(src_ino, (struct ext2_inode *) buf,
+				    argv[0], sizeof(buf)))
+		return;
+
+	if (debugfs_write_inode_full(dest_ino, (struct ext2_inode *) buf,
+				     argv[0], sizeof(buf)))
+		return;
+}
+
 #endif /* READ_ONLY */
 
 void do_find_free_block(int argc, char *argv[])