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


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


-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.


Enable extended inode refs.


Enable skinny metadata extent refs.


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.


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

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