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# 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.
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