btrfs-convert(8)
================

NAME
----
btrfs-convert - convert from ext2/3/4 filesystem to btrfs or rollback

SYNOPSIS
--------
*btrfs-convert* [options] <device>

DESCRIPTION
-----------
*btrfs-convert* is used to convert existed ext2/3/4 to btrfs filesystem,
and the original filesystem image is accessible as from separate subvolume
named 'ext2_saved' as file image.

WARNING: If one hopes to rollback to ext2/3/4, they should not execute
*btrfs balance* command on converted btrfs, since it will change the extent
layout and make *btrfs-convert* unable to rollback.

NOTE: If one is satisfied with converted btrfs, and not longer wants to
rollback to ext2/3/4, it is highly recommended to remove 'ext2_saved' subvolume
and execute *btrfs filesystem defragment* and *btrfs balance* command on the
converted btrfs.

OPTIONS
-------
-d|--no-datasum::
Disable data checksum calculations and set NODATASUM file flag. This can speed
up the conversion.
-i|--no-xattr::
Ignore xattrs and ACLs.
-n|--no-inline::
Disable inlining of small files to metadata blocks.
-N|--nodesize <SIZE>::
Set filesystem nodesize, the tree block size in which btrfs stores data.
The default value is 16KB (16384) or the page size, whichever is bigger.
Must be a multiple of the sectorsize, but not larger than 65536.
-r|--rollback::
Roll back to ext2fs.
-l|--label <LABEL>::
set filesystem label during conversion.
-L|--copy-label::
use label from the converted filesystem.
-p|--progress::
Show progress of conversion, on by default.
--no-progress::
Disable detailed progress and show only the main phases of conversion.

EXIT STATUS
-----------
*btrfs-convert* will return 0 if no error happened.
If any problems happened, 1 will be returned.

SEE ALSO
--------
`mkfs.btrfs`(8)