1 # SPDX-License-Identifier: GPL-2.0
4 tristate "Btrfs filesystem support"
16 select ZSTD_DECOMPRESS
21 depends on PAGE_SIZE_LESS_THAN_256KB
24 Btrfs is a general purpose copy-on-write filesystem with extents,
25 writable snapshotting, support for multiple devices and many more
26 features focused on fault tolerance, repair and easy administration.
28 The filesystem disk format is no longer unstable, and it's not
29 expected to change unless there are strong reasons to do so. If there
30 is a format change, file systems with a unchanged format will
31 continue to be mountable and usable by newer kernels.
33 For more information, please see the web pages at
34 http://btrfs.wiki.kernel.org.
36 To compile this file system support as a module, choose M here. The
37 module will be called btrfs.
41 config BTRFS_FS_POSIX_ACL
42 bool "Btrfs POSIX Access Control Lists"
46 POSIX Access Control Lists (ACLs) support permissions for users and
47 groups beyond the owner/group/world scheme.
49 If you don't know what Access Control Lists are, say N
51 config BTRFS_FS_CHECK_INTEGRITY
52 bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
55 Adds code that examines all block write requests (including
56 writes of the super block). The goal is to verify that the
57 state of the filesystem on disk is always consistent, i.e.,
58 after a power-loss or kernel panic event the filesystem is
59 in a consistent state.
61 If the integrity check tool is included and activated in
62 the mount options, plenty of kernel memory is used, and
63 plenty of additional CPU cycles are spent. Enabling this
64 functionality is not intended for normal use.
66 In most cases, unless you are a btrfs developer who needs
67 to verify the integrity of (super)-block write requests
68 during the run of a regression test, say N
70 config BTRFS_FS_RUN_SANITY_TESTS
71 bool "Btrfs will run sanity tests upon loading"
74 This will run some basic sanity tests on the free space cache
75 code to make sure it is acting as it should. These are mostly
76 regression tests and are only really interesting to btrfs
82 bool "Btrfs debugging support"
85 Enable run-time debugging support for the btrfs filesystem. This may
86 enable additional and expensive checks with negative impact on
87 performance, or export extra information via sysfs.
92 bool "Btrfs assert support"
95 Enable run-time assertion checking. This will result in panics if
96 any of the assertions trip. This is meant for btrfs developers only.
100 config BTRFS_FS_REF_VERIFY
101 bool "Btrfs with the ref verify tool compiled in"
105 Enable run-time extent reference verification instrumentation. This
106 is meant to be used by btrfs developers for tracking down extent
107 reference problems or verifying they didn't break something.