NAME
btrfs-property - get/set/list properties for given filesystem object
SYNOPSIS
btrfs property <subcommand> <args>
DESCRIPTION
btrfs property is used to get/set/list property for given filesystem object. The object can be an inode (file or directory), subvolume or the whole filesystem.
btrfs property provides an unified and user-friendly method to tune different btrfs properties instead of using the traditional method like chattr(1) or lsattr(1).
Object
types
A property might apply to several object types so in some
cases it's necessary to specify that explicitly, however
it's not needed in the most common case of files and
directories.
The subcommands take parameter -t, use first letter as a shortcut (f/s/d/i) of the type:
|
• |
filesystem |
|||
|
• |
subvolume |
|||
|
• |
device |
|||
|
• |
inode (file or directory) |
Inode
properties
compression
compression algorithm set for an inode (it's not possible to set the compression level this way), possible values:
|
• |
lzo | ||
|
• |
zlib | ||
|
• |
zstd | ||
|
• |
no or none - disable compression (equivalent to chattr +m) | ||
|
• |
"" (empty string) - set the default value |
NOTE:
This has changed in version 5.18 of btrfs-progs and requires kernel 5.14 or newer to work.
Subvolume properties
|
ro |
read-only flag of subvolume: true or false. Please also see section SUBVOLUME FLAGS in btrfs-subvolume(8) for possible implications regarding incremental send. |
Filesystem properties
|
label |
label of the filesystem. For an unmounted filesystem, provide a path to a block device as object. For a mounted filesystem, specify a mount point. |
SUBCOMMAND
get [-t <type>] <object> [<name>]
Read value of a property name of btrfs object of given type, empty name will read all of them
list [-t <type>] <object>
List available properties with their descriptions for the given object.
set [-f] [-t <type>] <object> <name> <value>
Set value of property name on a given btrfs object.
Options
|
-f |
Force the change. Changing some properties may involve safety checks or additional changes that depend on the properties semantics. |
EXAMPLES
Set compression on a file:
$ touch file1
$ btrfs prop get file1
[ empty output ]
$ btrfs prop set file1 compression zstd
$ btrfs prop get file1
compression=zstd
Make a writeable subvolume read-only:
$ btrfs subvol
create subvol1
[ fill subvol1 with data ]
$ btrfs prop get subvol1
ro=false
$ btrfs prop set subvol1 ro true
ro=true
EXIT STATUS
btrfs property returns a zero exit status if it succeeds. Non zero is returned in case of failure.
AVAILABILITY
btrfs is part of btrfs-progs. Please refer to the documentation at https://btrfs.readthedocs.io.