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 select SRCU 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 http://btrfs.wiki.kernel.org. 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 (DANGEROUS)" 53 depends on BTRFS_FS 54 help 55 Adds code that examines all block write requests (including 56 writes of the super block). The goal is to verify that the 57 state of the filesystem on disk is always consistent, i.e., 58 after a power-loss or kernel panic event the filesystem is 59 in a consistent state. 60 61 If the integrity check tool is included and activated in 62 the mount options, plenty of kernel memory is used, and 63 plenty of additional CPU cycles are spent. Enabling this 64 functionality is not intended for normal use. 65 66 In most cases, unless you are a btrfs developer who needs 67 to verify the integrity of (super)-block write requests 68 during the run of a regression test, say N 69 70config BTRFS_FS_RUN_SANITY_TESTS 71 bool "Btrfs will run sanity tests upon loading" 72 depends on BTRFS_FS 73 help 74 This will run some basic sanity tests on the free space cache 75 code to make sure it is acting as it should. These are mostly 76 regression tests and are only really interesting to btrfs 77 developers. 78 79 If unsure, say N. 80 81config BTRFS_DEBUG 82 bool "Btrfs debugging support" 83 depends on BTRFS_FS 84 help 85 Enable run-time debugging support for the btrfs filesystem. This may 86 enable additional and expensive checks with negative impact on 87 performance, or export extra information via sysfs. 88 89 If unsure, say N. 90 91config BTRFS_ASSERT 92 bool "Btrfs assert support" 93 depends on BTRFS_FS 94 help 95 Enable run-time assertion checking. This will result in panics if 96 any of the assertions trip. This is meant for btrfs developers only. 97 98 If unsure, say N. 99 100config BTRFS_FS_REF_VERIFY 101 bool "Btrfs with the ref verify tool compiled in" 102 depends on BTRFS_FS 103 default n 104 help 105 Enable run-time extent reference verification instrumentation. This 106 is meant to be used by btrfs developers for tracking down extent 107 reference problems or verifying they didn't break something. 108 109 If unsure, say N. 110