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 depends on PAGE_SIZE_LESS_THAN_256KB 21 22 help 23 Btrfs is a general purpose copy-on-write filesystem with extents, 24 writable snapshotting, support for multiple devices and many more 25 features focused on fault tolerance, repair and easy administration. 26 27 The filesystem disk format is no longer unstable, and it's not 28 expected to change unless there are strong reasons to do so. If there 29 is a format change, file systems with a unchanged format will 30 continue to be mountable and usable by newer kernels. 31 32 For more information, please see the web pages at 33 http://btrfs.wiki.kernel.org. 34 35 To compile this file system support as a module, choose M here. The 36 module will be called btrfs. 37 38 If unsure, say N. 39 40config BTRFS_FS_POSIX_ACL 41 bool "Btrfs POSIX Access Control Lists" 42 depends on BTRFS_FS 43 select FS_POSIX_ACL 44 help 45 POSIX Access Control Lists (ACLs) support permissions for users and 46 groups beyond the owner/group/world scheme. 47 48 If you don't know what Access Control Lists are, say N 49 50config BTRFS_FS_CHECK_INTEGRITY 51 bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 52 depends on BTRFS_FS 53 help 54 Adds code that examines all block write requests (including 55 writes of the super block). The goal is to verify that the 56 state of the filesystem on disk is always consistent, i.e., 57 after a power-loss or kernel panic event the filesystem is 58 in a consistent state. 59 60 If the integrity check tool is included and activated in 61 the mount options, plenty of kernel memory is used, and 62 plenty of additional CPU cycles are spent. Enabling this 63 functionality is not intended for normal use. 64 65 In most cases, unless you are a btrfs developer who needs 66 to verify the integrity of (super)-block write requests 67 during the run of a regression test, say N 68 69config BTRFS_FS_RUN_SANITY_TESTS 70 bool "Btrfs will run sanity tests upon loading" 71 depends on BTRFS_FS 72 help 73 This will run some basic sanity tests on the free space cache 74 code to make sure it is acting as it should. These are mostly 75 regression tests and are only really interesting to btrfs 76 developers. 77 78 If unsure, say N. 79 80config BTRFS_DEBUG 81 bool "Btrfs debugging support" 82 depends on BTRFS_FS 83 help 84 Enable run-time debugging support for the btrfs filesystem. This may 85 enable additional and expensive checks with negative impact on 86 performance, or export extra information via sysfs. 87 88 If unsure, say N. 89 90config BTRFS_ASSERT 91 bool "Btrfs assert support" 92 depends on BTRFS_FS 93 help 94 Enable run-time assertion checking. This will result in panics if 95 any of the assertions trip. This is meant for btrfs developers only. 96 97 If unsure, say N. 98 99config BTRFS_FS_REF_VERIFY 100 bool "Btrfs with the ref verify tool compiled in" 101 depends on BTRFS_FS 102 default n 103 help 104 Enable run-time extent reference verification instrumentation. This 105 is meant to be used by btrfs developers for tracking down extent 106 reference problems or verifying they didn't break something. 107 108 If unsure, say N. 109