1 # SPDX-License-Identifier: GPL-2.0
4 tristate "Btrfs filesystem support"
11 select ZSTD_DECOMPRESS
17 Btrfs is a general purpose copy-on-write filesystem with extents,
18 writable snapshotting, support for multiple devices and many more
19 features focused on fault tolerance, repair and easy administration.
21 The filesystem disk format is no longer unstable, and it's not
22 expected to change unless there are strong reasons to do so. If there
23 is a format change, file systems with a unchanged format will
24 continue to be mountable and usable by newer kernels.
26 For more information, please see the web pages at
27 http://btrfs.wiki.kernel.org.
29 To compile this file system support as a module, choose M here. The
30 module will be called btrfs.
34 config BTRFS_FS_POSIX_ACL
35 bool "Btrfs POSIX Access Control Lists"
39 POSIX Access Control Lists (ACLs) support permissions for users and
40 groups beyond the owner/group/world scheme.
42 If you don't know what Access Control Lists are, say N
44 config BTRFS_FS_CHECK_INTEGRITY
45 bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
48 Adds code that examines all block write requests (including
49 writes of the super block). The goal is to verify that the
50 state of the filesystem on disk is always consistent, i.e.,
51 after a power-loss or kernel panic event the filesystem is
52 in a consistent state.
54 If the integrity check tool is included and activated in
55 the mount options, plenty of kernel memory is used, and
56 plenty of additional CPU cycles are spent. Enabling this
57 functionality is not intended for normal use.
59 In most cases, unless you are a btrfs developer who needs
60 to verify the integrity of (super)-block write requests
61 during the run of a regression test, say N
63 config BTRFS_FS_RUN_SANITY_TESTS
64 bool "Btrfs will run sanity tests upon loading"
67 This will run some basic sanity tests on the free space cache
68 code to make sure it is acting as it should. These are mostly
69 regression tests and are only really interesting to btrfs
75 bool "Btrfs debugging support"
78 Enable run-time debugging support for the btrfs filesystem. This may
79 enable additional and expensive checks with negative impact on
80 performance, or export extra information via sysfs.
85 bool "Btrfs assert support"
88 Enable run-time assertion checking. This will result in panics if
89 any of the assertions trip. This is meant for btrfs developers only.
93 config BTRFS_FS_REF_VERIFY
94 bool "Btrfs with the ref verify tool compiled in"
98 Enable run-time extent reference verification instrumentation. This
99 is meant to be used by btrfs developers for tracking down extent
100 reference problems or verifying they didn't break something.