BTRFSTUNE(8)                               Btrfs Manual                              BTRFSTUNE(8)



NAME
       btrfstune - tune various btrfs filesystem parameters

SYNOPSIS
       btrfstune [options] <dev> [<dev>...]

DESCRIPTION
       btrfstune is used to tune various btrfs filesystem parameters,you can enable/disable some
       extended features for btrfs.

OPTIONS
       -S <value>
           Updates the seeding value. A positive value will enable seeding, zero will disable
           seeding, negtive is not allowed. Enable seeding forces a fs readonly so that you can
           use it to build other filesystems.

       -r
           Enable extended inode refs.

       -x
           Enable skinny metadata extent refs.

       -f
           Allow dangerous changes, e.g. clear the seeding flag

       When mounting the new device, btrfs will check whether the seeding flag is set when try to
       open seeding device. If the user clears the seeding flag of the seeding device, the new
       device will not be mountable. Even setting the seeding flag back will not fix this
       problem, because the generation will be changed at that time. Clear the seeding flag may
       damage the new filesystem.

EXIT STATUS
       btrfstune will return 0 if no error happened. If any problems happened, 1 will be
       returned.

SEE ALSO
       mkfs.btrfs(8)



Btrfs v3.17                                 11/22/2014                               BTRFSTUNE(8)