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