1# SPDX-License-Identifier: GPL-2.0 2 3config BTRFS_FS 4 tristate "Btrfs filesystem support" 5 select BLK_CGROUP_PUNT_BIO 6 select CRYPTO 7 select CRYPTO_CRC32C 8 select LIBCRC32C 9 select CRYPTO_XXHASH 10 select CRYPTO_SHA256 11 select CRYPTO_BLAKE2B 12 select ZLIB_INFLATE 13 select ZLIB_DEFLATE 14 select LZO_COMPRESS 15 select LZO_DECOMPRESS 16 select ZSTD_COMPRESS 17 select ZSTD_DECOMPRESS 18 select FS_IOMAP 19 select RAID6_PQ 20 select XOR_BLOCKS 21 depends on PAGE_SIZE_LESS_THAN_256KB 22 23 help 24 Btrfs is a general purpose copy-on-write filesystem with extents, 25 writable snapshotting, support for multiple devices and many more 26 features focused on fault tolerance, repair and easy administration. 27 28 The filesystem disk format is no longer unstable, and it's not 29 expected to change unless there are strong reasons to do so. If there 30 is a format change, file systems with a unchanged format will 31 continue to be mountable and usable by newer kernels. 32 33 For more information, please see the web pages at 34 https://btrfs.readthedocs.io 35 36 To compile this file system support as a module, choose M here. The 37 module will be called btrfs. 38 39 If unsure, say N. 40 41config BTRFS_FS_POSIX_ACL 42 bool "Btrfs POSIX Access Control Lists" 43 depends on BTRFS_FS 44 select FS_POSIX_ACL 45 help 46 POSIX Access Control Lists (ACLs) support permissions for users and 47 groups beyond the owner/group/world scheme. 48 49 If you don't know what Access Control Lists are, say N 50 51config BTRFS_FS_CHECK_INTEGRITY 52 bool "Btrfs with integrity check tool compiled in (DEPRECATED)" 53 depends on BTRFS_FS 54 help 55 This feature has been deprecated and will be removed in 6.7. 56 57 Adds code that examines all block write requests (including 58 writes of the super block). The goal is to verify that the 59 state of the filesystem on disk is always consistent, i.e., 60 after a power-loss or kernel panic event the filesystem is 61 in a consistent state. 62 63 If the integrity check tool is included and activated in 64 the mount options, plenty of kernel memory is used, and 65 plenty of additional CPU cycles are spent. Enabling this 66 functionality is not intended for normal use. 67 68 In most cases, unless you are a btrfs developer who needs 69 to verify the integrity of (super)-block write requests 70 during the run of a regression test, say N 71 72config BTRFS_FS_RUN_SANITY_TESTS 73 bool "Btrfs will run sanity tests upon loading" 74 depends on BTRFS_FS 75 help 76 This will run some basic sanity tests on the free space cache 77 code to make sure it is acting as it should. These are mostly 78 regression tests and are only really interesting to btrfs 79 developers. 80 81 If unsure, say N. 82 83config BTRFS_DEBUG 84 bool "Btrfs debugging support" 85 depends on BTRFS_FS 86 help 87 Enable run-time debugging support for the btrfs filesystem. This may 88 enable additional and expensive checks with negative impact on 89 performance, or export extra information via sysfs. 90 91 If unsure, say N. 92 93config BTRFS_ASSERT 94 bool "Btrfs assert support" 95 depends on BTRFS_FS 96 help 97 Enable run-time assertion checking. This will result in panics if 98 any of the assertions trip. This is meant for btrfs developers only. 99 100 If unsure, say N. 101 102config BTRFS_FS_REF_VERIFY 103 bool "Btrfs with the ref verify tool compiled in" 104 depends on BTRFS_FS 105 default n 106 help 107 Enable run-time extent reference verification instrumentation. This 108 is meant to be used by btrfs developers for tracking down extent 109 reference problems or verifying they didn't break something. 110 111 If unsure, say N. 112