1
2
3config BTRFS_FS
4 tristate "Btrfs filesystem support"
5 select CRYPTO
6 select CRYPTO_CRC32C
7 select LIBCRC32C
8 select CRYPTO_XXHASH
9 select CRYPTO_SHA256
10 select CRYPTO_BLAKE2B
11 select ZLIB_INFLATE
12 select ZLIB_DEFLATE
13 select LZO_COMPRESS
14 select LZO_DECOMPRESS
15 select ZSTD_COMPRESS
16 select ZSTD_DECOMPRESS
17 select FS_IOMAP
18 select RAID6_PQ
19 select XOR_BLOCKS
20 select SRCU
21 depends on !PPC_256K_PAGES
22 depends on !PAGE_SIZE_256KB
23
24 help
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.
28
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.
33
34 For more information, please see the web pages at
35 http://btrfs.wiki.kernel.org.
36
37 To compile this file system support as a module, choose M here. The
38 module will be called btrfs.
39
40 If unsure, say N.
41
42config BTRFS_FS_POSIX_ACL
43 bool "Btrfs POSIX Access Control Lists"
44 depends on BTRFS_FS
45 select FS_POSIX_ACL
46 help
47 POSIX Access Control Lists (ACLs) support permissions for users and
48 groups beyond the owner/group/world scheme.
49
50 If you don't know what Access Control Lists are, say N
51
52config BTRFS_FS_CHECK_INTEGRITY
53 bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
54 depends on BTRFS_FS
55 help
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.
61
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.
66
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
70
71config BTRFS_FS_RUN_SANITY_TESTS
72 bool "Btrfs will run sanity tests upon loading"
73 depends on BTRFS_FS
74 help
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
78 developers.
79
80 If unsure, say N.
81
82config BTRFS_DEBUG
83 bool "Btrfs debugging support"
84 depends on BTRFS_FS
85 help
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.
89
90 If unsure, say N.
91
92config BTRFS_ASSERT
93 bool "Btrfs assert support"
94 depends on BTRFS_FS
95 help
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.
98
99 If unsure, say N.
100
101config BTRFS_FS_REF_VERIFY
102 bool "Btrfs with the ref verify tool compiled in"
103 depends on BTRFS_FS
104 default n
105 help
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.
109
110 If unsure, say N.
111
