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 RAID6_PQ 18 select XOR_BLOCKS 19 select SRCU 20 21 help 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. 25 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. 30 31 For more information, please see the web pages at 32 http://btrfs.wiki.kernel.org. 33 34 To compile this file system support as a module, choose M here. The 35 module will be called btrfs. 36 37 If unsure, say N. 38 39config BTRFS_FS_POSIX_ACL 40 bool "Btrfs POSIX Access Control Lists" 41 depends on BTRFS_FS 42 select FS_POSIX_ACL 43 help 44 POSIX Access Control Lists (ACLs) support permissions for users and 45 groups beyond the owner/group/world scheme. 46 47 If you don't know what Access Control Lists are, say N 48 49config BTRFS_FS_CHECK_INTEGRITY 50 bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 51 depends on BTRFS_FS 52 help 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. 58 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. 63 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 67 68config BTRFS_FS_RUN_SANITY_TESTS 69 bool "Btrfs will run sanity tests upon loading" 70 depends on BTRFS_FS 71 help 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 75 developers. 76 77 If unsure, say N. 78 79config BTRFS_DEBUG 80 bool "Btrfs debugging support" 81 depends on BTRFS_FS 82 help 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. 86 87 If unsure, say N. 88 89config BTRFS_ASSERT 90 bool "Btrfs assert support" 91 depends on BTRFS_FS 92 help 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. 95 96 If unsure, say N. 97 98config BTRFS_FS_REF_VERIFY 99 bool "Btrfs with the ref verify tool compiled in" 100 depends on BTRFS_FS 101 default n 102 help 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. 106 107 If unsure, say N. 108