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suppose I have 2 btrfs filesystems:

  1. one mounted on /mnt/big spanning across /dev/sda /dev/sdb /dev/sdc /dev/sdd
  2. the other mounted on /mnt/small on a single drive: /dev/sde

How would I shrink the btrfs filesystem lying on /dev/sde to /dev/sde1?

The reason I want to do this is that /mnt/big is raid1 while /mnt/small is not and I would like to extend /mnt/big.

Thanks!

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If you feel a little like a python developer, see the https://github.com/g2p/blocks. It already does a similar stuff - shrinking a partition a few bytes off, to make a little place for bcache/lvm metadata.

If you don't - at least you can post a feature request. It should be relatively easy to add such feature to the already existing code.

Personally, I've used the blocks for bcache and it worked well for me.

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I don't think that is possible without using another drive.

If you have all of /dev/sde under btrfs management, how would you create the partition /dev/sde1 on the drive /dev/sde without destroying the existing file system?

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