e2undo
replay ext filesystem undo logs
TLDR
Display undo file info
$ e2undo -h [path/to/undo_file] [/dev/sdXN]
Dry run showing candidate blocks$ e2undo -nv [path/to/undo_file] [/dev/sdXN]
Perform undo operation$ e2undo [path/to/undo_file] [/dev/sdXN]
Perform undo with verbose output$ e2undo -v [path/to/undo_file] [/dev/sdXN]
Create backup undo file before overwriting$ e2undo -z [path/to/file.e2undo] [path/to/undo_file] [/dev/sdXN]
SYNOPSIS
e2undo [options] undo-file device
DESCRIPTION
e2undo replays undo logs for ext2/ext3/ext4 filesystems. This can reverse a failed or unwanted operation by e2fsprogs tools like e2fsck, resize2fs, or tune2fs, providing a safety mechanism for filesystem modifications.
Undo files are created when these tools are run with the -z option. The undo file records all blocks modified during the operation, allowing precise rollback to the pre-operation state. This is particularly valuable when testing filesystem modifications or recovering from interrupted operations.
PARAMETERS
-h
Display undo file information-n
Dry run, don't modify filesystem-v
Verbose output-z file
Create backup undo file
CAVEATS
Requires undo file created with -z option. Part of e2fsprogs. Filesystem must be unmounted.