# SPDX-License-Identifier: GPL-2.0 config BTRFS_FS tristate "Btrfs filesystem support" select BLK_CGROUP_PUNT_BIO select CRC32 select CRYPTO select CRYPTO_CRC32C select CRYPTO_XXHASH select CRYPTO_SHA256 select CRYPTO_BLAKE2B select ZLIB_INFLATE select ZLIB_DEFLATE select LZO_COMPRESS select LZO_DECOMPRESS select ZSTD_COMPRESS select ZSTD_DECOMPRESS select FS_IOMAP select RAID6_PQ select XOR_BLOCKS depends on PAGE_SIZE_LESS_THAN_256KB help Btrfs is a general purpose copy-on-write filesystem with extents, writable snapshotting, support for multiple devices and many more features focused on fault tolerance, repair and easy administration. The filesystem disk format is no longer unstable, and it's not expected to change unless there are strong reasons to do so. If there is a format change, file systems with a unchanged format will continue to be mountable and usable by newer kernels. For more information, please see the web pages at https://btrfs.readthedocs.io To compile this file system support as a module, choose M here. The module will be called btrfs. If unsure, say N. config BTRFS_FS_POSIX_ACL bool "Btrfs POSIX Access Control Lists" depends on BTRFS_FS select FS_POSIX_ACL help POSIX Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme. If you don't know what Access Control Lists are, say N config BTRFS_FS_RUN_SANITY_TESTS bool "Btrfs will run sanity tests upon loading" depends on BTRFS_FS help This will run sanity tests for core functionality like free space, extent maps, extent io, extent buffers, inodes, qgroups and others, at module load time. These are mostly regression tests and are only interesting to developers. If unsure, say N. config BTRFS_DEBUG bool "Btrfs debugging support" depends on BTRFS_FS help Enable run-time debugging support for the btrfs filesystem. Additional potentially expensive checks, debugging functionality or sysfs exported information is enabled, like leak checks of internal objects, optional forced space fragmentation and /sys/fs/btrfs/debug . This has negative impact on performance. If unsure, say N. config BTRFS_ASSERT bool "Btrfs assert support" depends on BTRFS_FS help Enable run-time assertion checking. Additional safety checks are done, simple enough not to affect performance but verify invariants and assumptions of code to run properly. This may result in panics, and is meant for developers but can be enabled in general. If unsure, say N. config BTRFS_EXPERIMENTAL bool "Btrfs experimental features" depends on BTRFS_FS default n help Enable experimental features. These features may not be stable enough for end users. This is meant for btrfs developers or users who wish to test the functionality and report problems. Current list: - COW fixup worker warning - last warning before removing the functionality catching out-of-band page dirtying, not necessary since 5.8 - RAID mirror read policy - additional read policies for balancing reading from redundant block group profiles (currently: pid, round-robin, fixed devid) - send stream protocol v3 - fs-verity support - checksum offload mode - sysfs knob to affect when checksums are calculated (at IO time, or in a thread) - raid-stripe-tree - additional mapping of extents to devices to support RAID1* profiles on zoned devices, RAID56 not yet supported - extent tree v2 - complex rework of extent tracking If unsure, say N. config BTRFS_FS_REF_VERIFY bool "Btrfs with the ref verify tool compiled in" depends on BTRFS_FS default n help Enable run-time extent reference verification instrumentation. This is meant to be used by btrfs developers for tracking down extent reference problems or verifying they didn't break something. If unsure, say N.