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man pages section 8: System Administration Commands

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Updated: Thursday, June 13, 2019

vfs_btrfs (8)


vfs_btrfs - Utilize features provided by the Btrfs filesystem


vfs objects = btrfs


System Administration tools                                       VFS_BTRFS(8)

       vfs_btrfs - Utilize features provided by the Btrfs filesystem

       vfs objects = btrfs

       This VFS module is part of the samba(8) suite.

       The vfs_btrfs VFS module exposes Btrfs specific features for use by

       Btrfs allows for multiple files to share the same on-disk data through
       the use cloned ranges. When an SMB client issues a request to copy
       duplicate data (via FSCTL_SRV_COPYCHUNK), this module maps the request
       to a Btrfs clone range IOCTL, instead of performing reads and writes
       required by a traditional copy. Doing so saves storage capacity and
       greatly reduces disk IO.

       This module also exposes Btrfs per-file compression support to SMB
       clients via the get/set compression fsctls.

       Btrfs snapshots can be manipulated by Samba's FSRVP server. Snapshot
       manipulation using this module is currently considered experimental,
       and is therefore disabled by default. The vfs_snapper module is instead
       recommended for this purpose.

       This module is stackable.

       btrfs: manipulate snapshots = [yes|no]
           When set to yes, experimental support for the creation and deletion
           of snapshots via corresponding Btrfs IOCTLs will be enabled. The
           default is no, which means that such requests are passed through to
           any underlying VFS module.

       vfs_btrfs requires that the underlying share path is a Btrfs subvolume.

                     vfs objects = btrfs
                     btrfs: manipulate snapshots = no

       To use the experimental snapshot manipulation functionality provided by
       this module, it must be explicitly enabled, and Samba's FSRVP server
       must be running.

       The vfs_shadow_copy module can be used to expose snapshots created by
       vfs_btrfs to Windows Explorer as file / directory "previous versions".

                     rpc_daemon:fssd = fork
                     registry shares = yes
                     include = registry

                     vfs objects = btrfs shadow_copy
                     btrfs: manipulate snapshots = yes

       This man page is part of version 4.9.3 of the Samba suite.

       The original Samba software and related utilities were created by
       Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

       See attributes(7) for descriptions of the following attributes:

       |Availability   | service/network/samba |
       |Stability      | Volatile              |
       This software was built from source available at
       https://github.com/oracle/solaris-userland.  The original community
       source was downloaded from

       Further information about this software can be found on the open source
       community website at http://www.samba.org/.

Samba 4.9.3                       01/24/2019                      VFS_BTRFS(8)