1 # SPDX-License-Identifier: GPL-2.0
4 tristate "Btrfs filesystem support"
16 select ZSTD_DECOMPRESS
21 depends on !PPC_256K_PAGES # powerpc
22 depends on !PAGE_SIZE_256KB # hexagon
25 Btrfs is a general purpose copy-on-write filesystem with extents,
26 writable snapshotting, support for multiple devices and many more
27 features focused on fault tolerance, repair and easy administration.
29 The filesystem disk format is no longer unstable, and it's not
30 expected to change unless there are strong reasons to do so. If there
31 is a format change, file systems with a unchanged format will
32 continue to be mountable and usable by newer kernels.
34 For more information, please see the web pages at
35 http://btrfs.wiki.kernel.org.
37 To compile this file system support as a module, choose M here. The
38 module will be called btrfs.
42 config BTRFS_FS_POSIX_ACL
43 bool "Btrfs POSIX Access Control Lists"
47 POSIX Access Control Lists (ACLs) support permissions for users and
48 groups beyond the owner/group/world scheme.
50 If you don't know what Access Control Lists are, say N
52 config BTRFS_FS_CHECK_INTEGRITY
53 bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
56 Adds code that examines all block write requests (including
57 writes of the super block). The goal is to verify that the
58 state of the filesystem on disk is always consistent, i.e.,
59 after a power-loss or kernel panic event the filesystem is
60 in a consistent state.
62 If the integrity check tool is included and activated in
63 the mount options, plenty of kernel memory is used, and
64 plenty of additional CPU cycles are spent. Enabling this
65 functionality is not intended for normal use.
67 In most cases, unless you are a btrfs developer who needs
68 to verify the integrity of (super)-block write requests
69 during the run of a regression test, say N
71 config BTRFS_FS_RUN_SANITY_TESTS
72 bool "Btrfs will run sanity tests upon loading"
75 This will run some basic sanity tests on the free space cache
76 code to make sure it is acting as it should. These are mostly
77 regression tests and are only really interesting to btrfs
83 bool "Btrfs debugging support"
86 Enable run-time debugging support for the btrfs filesystem. This may
87 enable additional and expensive checks with negative impact on
88 performance, or export extra information via sysfs.
93 bool "Btrfs assert support"
96 Enable run-time assertion checking. This will result in panics if
97 any of the assertions trip. This is meant for btrfs developers only.
101 config BTRFS_FS_REF_VERIFY
102 bool "Btrfs with the ref verify tool compiled in"
106 Enable run-time extent reference verification instrumentation. This
107 is meant to be used by btrfs developers for tracking down extent
108 reference problems or verifying they didn't break something.