1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 config BTRFS_FS 3 config BTRFS_FS
4 tristate "Btrfs filesystem support" 4 tristate "Btrfs filesystem support"
5 select BLK_CGROUP_PUNT_BIO 5 select BLK_CGROUP_PUNT_BIO
6 select CRYPTO 6 select CRYPTO
7 select CRYPTO_CRC32C 7 select CRYPTO_CRC32C
8 select LIBCRC32C 8 select LIBCRC32C
9 select CRYPTO_XXHASH 9 select CRYPTO_XXHASH
10 select CRYPTO_SHA256 10 select CRYPTO_SHA256
11 select CRYPTO_BLAKE2B 11 select CRYPTO_BLAKE2B
12 select ZLIB_INFLATE 12 select ZLIB_INFLATE
13 select ZLIB_DEFLATE 13 select ZLIB_DEFLATE
14 select LZO_COMPRESS 14 select LZO_COMPRESS
15 select LZO_DECOMPRESS 15 select LZO_DECOMPRESS
16 select ZSTD_COMPRESS 16 select ZSTD_COMPRESS
17 select ZSTD_DECOMPRESS 17 select ZSTD_DECOMPRESS
18 select FS_IOMAP 18 select FS_IOMAP
19 select RAID6_PQ 19 select RAID6_PQ
20 select XOR_BLOCKS 20 select XOR_BLOCKS
21 depends on PAGE_SIZE_LESS_THAN_256KB 21 depends on PAGE_SIZE_LESS_THAN_256KB
22 22
23 help 23 help
24 Btrfs is a general purpose copy-on-w 24 Btrfs is a general purpose copy-on-write filesystem with extents,
25 writable snapshotting, support for m 25 writable snapshotting, support for multiple devices and many more
26 features focused on fault tolerance, 26 features focused on fault tolerance, repair and easy administration.
27 27
28 The filesystem disk format is no lon 28 The filesystem disk format is no longer unstable, and it's not
29 expected to change unless there are 29 expected to change unless there are strong reasons to do so. If there
30 is a format change, file systems wit 30 is a format change, file systems with a unchanged format will
31 continue to be mountable and usable 31 continue to be mountable and usable by newer kernels.
32 32
33 For more information, please see the 33 For more information, please see the web pages at
34 https://btrfs.readthedocs.io !! 34 http://btrfs.wiki.kernel.org.
35 35
36 To compile this file system support 36 To compile this file system support as a module, choose M here. The
37 module will be called btrfs. 37 module will be called btrfs.
38 38
39 If unsure, say N. 39 If unsure, say N.
40 40
41 config BTRFS_FS_POSIX_ACL 41 config BTRFS_FS_POSIX_ACL
42 bool "Btrfs POSIX Access Control Lists 42 bool "Btrfs POSIX Access Control Lists"
43 depends on BTRFS_FS 43 depends on BTRFS_FS
44 select FS_POSIX_ACL 44 select FS_POSIX_ACL
45 help 45 help
46 POSIX Access Control Lists (ACLs) su 46 POSIX Access Control Lists (ACLs) support permissions for users and
47 groups beyond the owner/group/world 47 groups beyond the owner/group/world scheme.
48 48
49 If you don't know what Access Contro 49 If you don't know what Access Control Lists are, say N
>> 50
>> 51 config BTRFS_FS_CHECK_INTEGRITY
>> 52 bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
>> 53 depends on BTRFS_FS
>> 54 help
>> 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.
>> 60
>> 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.
>> 65
>> 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
50 69
51 config BTRFS_FS_RUN_SANITY_TESTS 70 config BTRFS_FS_RUN_SANITY_TESTS
52 bool "Btrfs will run sanity tests upon 71 bool "Btrfs will run sanity tests upon loading"
53 depends on BTRFS_FS 72 depends on BTRFS_FS
54 help 73 help
55 This will run some basic sanity test 74 This will run some basic sanity tests on the free space cache
56 code to make sure it is acting as it 75 code to make sure it is acting as it should. These are mostly
57 regression tests and are only really 76 regression tests and are only really interesting to btrfs
58 developers. 77 developers.
59 78
60 If unsure, say N. 79 If unsure, say N.
61 80
62 config BTRFS_DEBUG 81 config BTRFS_DEBUG
63 bool "Btrfs debugging support" 82 bool "Btrfs debugging support"
64 depends on BTRFS_FS 83 depends on BTRFS_FS
65 help 84 help
66 Enable run-time debugging support fo 85 Enable run-time debugging support for the btrfs filesystem. This may
67 enable additional and expensive chec 86 enable additional and expensive checks with negative impact on
68 performance, or export extra informa 87 performance, or export extra information via sysfs.
69 88
70 If unsure, say N. 89 If unsure, say N.
71 90
72 config BTRFS_ASSERT 91 config BTRFS_ASSERT
73 bool "Btrfs assert support" 92 bool "Btrfs assert support"
74 depends on BTRFS_FS 93 depends on BTRFS_FS
75 help 94 help
76 Enable run-time assertion checking. 95 Enable run-time assertion checking. This will result in panics if
77 any of the assertions trip. This is 96 any of the assertions trip. This is meant for btrfs developers only.
78 97
79 If unsure, say N. 98 If unsure, say N.
80 99
81 config BTRFS_FS_REF_VERIFY 100 config BTRFS_FS_REF_VERIFY
82 bool "Btrfs with the ref verify tool c 101 bool "Btrfs with the ref verify tool compiled in"
83 depends on BTRFS_FS 102 depends on BTRFS_FS
84 default n 103 default n
85 help 104 help
86 Enable run-time extent reference ver 105 Enable run-time extent reference verification instrumentation. This
87 is meant to be used by btrfs develop 106 is meant to be used by btrfs developers for tracking down extent
88 reference problems or verifying they 107 reference problems or verifying they didn't break something.
89 108
90 If unsure, say N. 109 If unsure, say N.
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