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