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