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102 lines
2.7 KiB
ReStructuredText
102 lines
2.7 KiB
ReStructuredText
.. BTRFS integration related pages index
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Interoperability
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================
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.. _interop-cgroups:
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cgroups
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-------
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Cgroups are supported for the IO controller, for compressed and uncompressed
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data. This can be used to limit bandwidth or for accounting. The cgroups can
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be configured directly or e.g. via systemd directives *IOAccounting*,
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*IOWeight* etc.
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See also :manref:`systemd.resource-control(5)`.
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.. _interop-fsverity:
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fsverity
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--------
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The fs-verity is a support layer that filesystems can hook into to
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support transparent integrity and authenticity protection of read-only
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files. This requires a separate management utility :command:`fsverity`.
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The ioctls supported by btrfs:
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* `FS_IOC_ENABLE_VERITY <https://www.kernel.org/doc/html/latest/filesystems/fsverity.html#fs-ioc-enable-verity>`__
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* `FS_IOC_MEASURE_VERITY <https://www.kernel.org/doc/html/latest/filesystems/fsverity.html#fs-ioc-measure-verity>`__
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See also:
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https://www.kernel.org/doc/html/latest/filesystems/fsverity.html
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.. _interop-idmapped:
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idmapped mounts
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---------------
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Btrfs supports mount with UID/GID mapped according to another namespace since
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version 5.15.
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See also:
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https://lwn.net/Articles/837566/
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Device mapper, MD-RAID
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----------------------
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Btrfs works on top of device mapper (DM) and linux multi-device software RAID
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(MD-RAID) block devices transparently without any need for additional
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configuration. There is no integration so device failures are not handled
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automatically in any way, must be resolved either in btrfs or on the DM/MD
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layer.
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The functionality of DM/MD may duplicate the one provided by btrfs (like
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mirroring), it's possible to use it that way but is probably wasteful and may
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degrade performance. Creating a filesystem on top of the multiplexed device is
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likely the desired way.
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overlayfs
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---------
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Since kernel 4.15 the btrfs filesystem can be used as *lower* filesystem
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for overlayfs (supporting the rename modes of *exchange* and *whiteout*).
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SELinux
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-------
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.. _interop-io-uring:
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io_uring
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--------
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.. _interop-nfs:
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NFS
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---
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NFS is supported. When exporting a subvolume it is recommended to use the
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*fsid* option with a unique id in case the server needs to restart. This
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is recommended namely when clients use the mount option *hard*.
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Example of server side export:
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.. code-block:: none
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/mnt/data/subvolume1 192.168.1.2/24(fsid=12345,rw,sync)
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/mnt/data/subvolume2 192.168.1.2/24(fsid=23456,rw,sync)
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See also :manref:`exports(5)`.
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.. _interop-samba:
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Samba
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-----
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The Samba VFS module *btrfs* adds support for compression, snapshots and server-side
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copy (backed by reflink/clone range ioctl).
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See also:
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https://wiki.samba.org/index.php/Server-Side_Copy#Btrfs_Enhanced_Server-Side_Copy_Offload
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