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 help 66 Enable run-time debugging support for the btrfs filesystem. 67 68 Additional potentially expensive checks, debugging functionality or 69 sysfs exported information is enabled, like leak checks of internal 70 objects, optional forced space fragmentation and /sys/fs/btrfs/debug . 71 This has negative impact on performance. 72 73 If unsure, say N. 74 75config BTRFS_ASSERT 76 bool "Btrfs assert support" 77 depends on BTRFS_FS 78 help 79 Enable run-time assertion checking. Additional safety checks are 80 done, simple enough not to affect performance but verify invariants 81 and assumptions of code to run properly. This may result in panics, 82 and is meant for developers but can be enabled in general. 83 84 If unsure, say N. 85 86config BTRFS_EXPERIMENTAL 87 bool "Btrfs experimental features" 88 depends on BTRFS_FS 89 default n 90 help 91 Enable experimental features. These features may not be stable enough 92 for end users. This is meant for btrfs developers or users who wish 93 to test the functionality and report problems. 94 95 Current list: 96 97 - COW fixup worker warning - last warning before removing the 98 functionality catching out-of-band page 99 dirtying, not necessary since 5.8 100 101 - RAID mirror read policy - additional read policies for balancing 102 reading from redundant block group 103 profiles (currently: pid, round-robin, 104 fixed devid) 105 106 - send stream protocol v3 - fs-verity support 107 108 - checksum offload mode - sysfs knob to affect when checksums are 109 calculated (at IO time, or in a thread) 110 111 - raid-stripe-tree - additional mapping of extents to devices to 112 support RAID1* profiles on zoned devices, 113 RAID56 not yet supported 114 115 - extent tree v2 - complex rework of extent tracking 116 117 If unsure, say N. 118 119config BTRFS_FS_REF_VERIFY 120 bool "Btrfs with the ref verify tool compiled in" 121 depends on BTRFS_FS 122 default n 123 help 124 Enable run-time extent reference verification instrumentation. This 125 is meant to be used by btrfs developers for tracking down extent 126 reference problems or verifying they didn't break something. 127 128 If unsure, say N. 129