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