1# SPDX-License-Identifier: GPL-2.0 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 # powerpc 22 depends on !PAGE_SIZE_256KB # hexagon 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