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Ntfs2btrfs
==========
Ntfs2btrfs is a tool which does in-place conversion of Microsoft's NTFS
filesystem to the open-source filesystem Btrfs, much as `btrfs-convert`
does for ext2. The original image is saved as a reflink copy at
`image/ntfs.img`, and if you want to keep the conversion you can delete
this to free up space.
Although I believe this tool to be stable, please note that I take no
responsibility if something goes awry!
You're probably also interested in [WinBtrfs](https://github.com/maharmstone/btrfs),
which is a Btrfs filesystem driver for Windows.
Thanks to [Eric Biggers](https://github.com/ebiggers), who [successfully reverse-engineered](https://github.com/ebiggers/ntfs-3g-system-compression/) Windows 10's
"WOF compressed data", and whose code I've used here.
Usage
-----
On Windows, from an Administrator command prompt:
`ntfs2btrfs.exe D:\`
Bear in mind that it won't work with your boot drive or a drive containing a
pagefile that's currently in use.
On Linux, as root:
`ntfs2btrfs /dev/sda1`
Installation
------------
On Windows, go to the [Releases page](https://github.com/maharmstone/ntfs2btrfs/releases) and
download the latest Zip file, or use [Scoop](https://github.com/ScoopInstaller/Main/blob/master/bucket/ntfs2btrfs.json).
For Linux:
* [Arch](https://aur.archlinux.org/packages/ntfs2btrfs)
* [Fedora](https://src.fedoraproject.org/rpms/ntfs2btrfs) (thanks to [Conan-Kudo](https://github.com/Conan-Kudo))
* Gentoo - available as sys-fs/ntfs2btrfs in the guru repository
* [Debian](https://packages.debian.org/ntfs2btrfs) (thanks to [alexmyczko](https://github.com/alexmyczko))
* [Ubuntu](https://packages.ubuntu.com/ntfs2btrfs) (thanks to [alexmyczko](https://github.com/alexmyczko))
* [openSUSE](https://build.opensuse.org/package/show/filesystems/ntfs2btrfs) (thanks to David Sterba)
For other distributions or operating systems, you will need to compile it yourself - see
below.
Changelog
---------
* 20240115
* Fixed compilation on GCC 14 (`-Werror=incompatible-pointer-types` now enabled by default)
* 20230501
* Fixed inline extent items being written out of order (not diagnosed by `btrfs check`)
* Fixed metadata items being written with wrong level value (not diagnosed by `btrfs check`)
* ADSes with overly-long names now get skipped
* 20220812
* Added --no-datasum option, to skip calculating checksums
* LXSS / WSL metadata is now preserved
* Fixed lowercase drive letters not being recognized
* Fixed crash due to iterator invalidation (thanks to nyanpasu64)
* Fixed corruption when NTFS places file in last megabyte of disk
* 20210923
* Added (Btrfs) compression support (zlib, lzo, and zstd)
* Added support for other hash algorithms: xxhash, sha256, and blake2
* Added support for rolling back to NTFS
* Added support for NT4-style security descriptors
* Increased conversion speed for volume with many inodes
* Fixed bug when fragmented file was in superblock location
* Fixed buffer overflow when reading security descriptors
* Fixed bug where filesystems would be corrupted in a way that `btrfs check` doesn't pick up
* 20210523
* Improved handling of large compressed files
* 20210402 (source code only release)
* Fixes for compilation on non-amd64 architectures
* 20210105
* Added support for NTFS compression
* Added support for "WOF compressed data"
* Fixed problems caused by sparse files
* Miscellaneous bug fixes
* 20201108
* Improved error handling
* Added better message if NTFS is corrupted or unclean
* Better handling of relocations
* 20200330
* Initial release
Compilation
-----------
On Windows, open the source directory in a recent version of MSVC, right-click
on CMakeLists.txt, and click Compile.
On Linux:
mkdir build
cd build
cmake ..
make
You'll also need [libfmt](https://github.com/fmtlib/fmt) installed - it should be
in your package manager.
Compression support requires zlib, lzo, and/or zstd - again, they will be in your
package manager. See also the cmake options WITH_ZLIB, WITH_LZO, and WITH_ZSTD,
if you want to disable this.
What works
----------
* Files
* Directories
* Symlinks
* Other reparse points
* Security descriptors
* Alternate data streams
* DOS attributes (hidden, system, etc.)
* Rollback to original NTFS image
* Preservation of LXSS metadata
What doesn't work
-----------------
* Windows' old extended attributes (you're not using these)
* Large (i.e >16KB) ADSes (you're not using these either)
* Preservation of the case-sensitivity flag
* Unusual cluster sizes (i.e. not 4 KB)
* Encrypted files
Can I boot Windows from Btrfs with this?
----------------------------------------
Yes, if the stars are right. See [Quibble](https://github.com/maharmstone/quibble).
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