1# SPDX-License-Identifier: GPL-2.0 2 3config BTRFS_FS 4 tristate "Btrfs filesystem support" 5 select BLK_CGROUP_PUNT_BIO 6 select CRC32 7 select CRYPTO 8 select CRYPTO_CRC32C 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_RUN_SANITY_TESTS 52 bool "Btrfs will run sanity tests upon loading" 53 depends on BTRFS_FS 54 help 55 This will run sanity tests for core functionality like free space, 56 extent maps, extent io, extent buffers, inodes, qgroups and others, 57 at module load time. These are mostly regression tests and are only 58 interesting to developers. 59 60 If unsure, say N. 61 62config BTRFS_DEBUG 63 bool "Btrfs debugging support" 64 depends on BTRFS_FS 65 select REF_TRACKER if STACKTRACE_SUPPORT 66 help 67 Enable run-time debugging support for the btrfs filesystem. 68 69 Additional potentially expensive checks, debugging functionality or 70 sysfs exported information is enabled, like leak checks of internal 71 objects, optional forced space fragmentation and /sys/fs/btrfs/debug . 72 This has negative impact on performance. 73 74 If unsure, say N. 75 76config BTRFS_ASSERT 77 bool "Btrfs assert support" 78 depends on BTRFS_FS 79 help 80 Enable run-time assertion checking. Additional safety checks are 81 done, simple enough not to affect performance but verify invariants 82 and assumptions of code to run properly. This may result in panics, 83 and is meant for developers but can be enabled in general. 84 85 If unsure, say N. 86 87config BTRFS_EXPERIMENTAL 88 bool "Btrfs experimental features" 89 depends on BTRFS_FS 90 default n 91 help 92 Enable experimental features. These features may not be stable enough 93 for end users. This is meant for btrfs developers or users who wish 94 to test the functionality and report problems. 95 96 Current list: 97 98 - COW fixup worker warning - last warning before removing the 99 functionality catching out-of-band page 100 dirtying, not necessary since 5.8 101 102 - RAID mirror read policy - additional read policies for balancing 103 reading from redundant block group 104 profiles (currently: pid, round-robin, 105 fixed devid) 106 107 - send stream protocol v3 - fs-verity support 108 109 - checksum offload mode - sysfs knob to affect when checksums are 110 calculated (at IO time, or in a thread) 111 112 - raid-stripe-tree - additional mapping of extents to devices to 113 support RAID1* profiles on zoned devices, 114 RAID56 not yet supported 115 116 - extent tree v2 - complex rework of extent tracking 117 118 - large folio support 119 120 If unsure, say N. 121