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