1852eb3aeSDavid Sterba# SPDX-License-Identifier: GPL-2.0 2852eb3aeSDavid Sterba 3335debeeSAlexey Dobriyanconfig BTRFS_FS 4aa825914SDavid Sterba tristate "Btrfs filesystem support" 5*2c275afeSChristoph Hellwig select BLK_CGROUP_PUNT_BIO 6d5178578SJohannes Thumshirn select CRYPTO 7d5178578SJohannes Thumshirn select CRYPTO_CRC32C 8314c4cd6SYueHaibing select LIBCRC32C 93951e7f0SJohannes Thumshirn select CRYPTO_XXHASH 103831bf00SJohannes Thumshirn select CRYPTO_SHA256 1178f926f7SDavid Sterba select CRYPTO_BLAKE2B 12335debeeSAlexey Dobriyan select ZLIB_INFLATE 13335debeeSAlexey Dobriyan select ZLIB_DEFLATE 14a6fa6faeSLi Zefan select LZO_COMPRESS 15a6fa6faeSLi Zefan select LZO_DECOMPRESS 165c1aab1dSNick Terrell select ZSTD_COMPRESS 175c1aab1dSNick Terrell select ZSTD_DECOMPRESS 18f85781fbSGoldwyn Rodrigues select FS_IOMAP 1953b381b3SDavid Woodhouse select RAID6_PQ 2010e78e3aSTomasz Torcz select XOR_BLOCKS 21e9009095SNathan Chancellor depends on PAGE_SIZE_LESS_THAN_256KB 2253b381b3SDavid Woodhouse 23335debeeSAlexey Dobriyan help 244204617dSDavid Sterba Btrfs is a general purpose copy-on-write filesystem with extents, 254204617dSDavid Sterba writable snapshotting, support for multiple devices and many more 264204617dSDavid Sterba features focused on fault tolerance, repair and easy administration. 27335debeeSAlexey Dobriyan 284204617dSDavid Sterba The filesystem disk format is no longer unstable, and it's not 294204617dSDavid Sterba expected to change unless there are strong reasons to do so. If there 304204617dSDavid Sterba is a format change, file systems with a unchanged format will 314204617dSDavid Sterba continue to be mountable and usable by newer kernels. 324204617dSDavid Sterba 334204617dSDavid Sterba For more information, please see the web pages at 344204617dSDavid Sterba http://btrfs.wiki.kernel.org. 35335debeeSAlexey Dobriyan 36335debeeSAlexey Dobriyan To compile this file system support as a module, choose M here. The 37335debeeSAlexey Dobriyan module will be called btrfs. 38335debeeSAlexey Dobriyan 39335debeeSAlexey Dobriyan If unsure, say N. 40bef62ef3SChristian Hesse 41bef62ef3SChristian Hesseconfig BTRFS_FS_POSIX_ACL 42bef62ef3SChristian Hesse bool "Btrfs POSIX Access Control Lists" 43bef62ef3SChristian Hesse depends on BTRFS_FS 44bef62ef3SChristian Hesse select FS_POSIX_ACL 45bef62ef3SChristian Hesse help 46bef62ef3SChristian Hesse POSIX Access Control Lists (ACLs) support permissions for users and 47bef62ef3SChristian Hesse groups beyond the owner/group/world scheme. 48bef62ef3SChristian Hesse 49bef62ef3SChristian Hesse If you don't know what Access Control Lists are, say N 50c975dd46SStefan Behrens 51c975dd46SStefan Behrensconfig BTRFS_FS_CHECK_INTEGRITY 52c975dd46SStefan Behrens bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 53c975dd46SStefan Behrens depends on BTRFS_FS 54c975dd46SStefan Behrens help 55c975dd46SStefan Behrens Adds code that examines all block write requests (including 56c975dd46SStefan Behrens writes of the super block). The goal is to verify that the 57c975dd46SStefan Behrens state of the filesystem on disk is always consistent, i.e., 58c975dd46SStefan Behrens after a power-loss or kernel panic event the filesystem is 59c975dd46SStefan Behrens in a consistent state. 60c975dd46SStefan Behrens 61c975dd46SStefan Behrens If the integrity check tool is included and activated in 62c975dd46SStefan Behrens the mount options, plenty of kernel memory is used, and 63c975dd46SStefan Behrens plenty of additional CPU cycles are spent. Enabling this 64c975dd46SStefan Behrens functionality is not intended for normal use. 65c975dd46SStefan Behrens 66c975dd46SStefan Behrens In most cases, unless you are a btrfs developer who needs 67c975dd46SStefan Behrens to verify the integrity of (super)-block write requests 68c975dd46SStefan Behrens during the run of a regression test, say N 6974255aa0SJosef Bacik 7074255aa0SJosef Bacikconfig BTRFS_FS_RUN_SANITY_TESTS 7174255aa0SJosef Bacik bool "Btrfs will run sanity tests upon loading" 7274255aa0SJosef Bacik depends on BTRFS_FS 7374255aa0SJosef Bacik help 7474255aa0SJosef Bacik This will run some basic sanity tests on the free space cache 7574255aa0SJosef Bacik code to make sure it is acting as it should. These are mostly 76a26a8746SMichael Witten regression tests and are only really interesting to btrfs 77a26a8746SMichael Witten developers. 7874255aa0SJosef Bacik 7974255aa0SJosef Bacik If unsure, say N. 8074255aa0SJosef Bacik 816d49ba1bSEric Sandeenconfig BTRFS_DEBUG 826d49ba1bSEric Sandeen bool "Btrfs debugging support" 836d49ba1bSEric Sandeen depends on BTRFS_FS 846d49ba1bSEric Sandeen help 856d49ba1bSEric Sandeen Enable run-time debugging support for the btrfs filesystem. This may 866d49ba1bSEric Sandeen enable additional and expensive checks with negative impact on 876d49ba1bSEric Sandeen performance, or export extra information via sysfs. 886d49ba1bSEric Sandeen 896d49ba1bSEric Sandeen If unsure, say N. 902e17c7c6SJosef Bacik 912e17c7c6SJosef Bacikconfig BTRFS_ASSERT 922e17c7c6SJosef Bacik bool "Btrfs assert support" 932e17c7c6SJosef Bacik depends on BTRFS_FS 942e17c7c6SJosef Bacik help 952e17c7c6SJosef Bacik Enable run-time assertion checking. This will result in panics if 962e17c7c6SJosef Bacik any of the assertions trip. This is meant for btrfs developers only. 972e17c7c6SJosef Bacik 982e17c7c6SJosef Bacik If unsure, say N. 99fd708b81SJosef Bacik 100fd708b81SJosef Bacikconfig BTRFS_FS_REF_VERIFY 101fd708b81SJosef Bacik bool "Btrfs with the ref verify tool compiled in" 102fd708b81SJosef Bacik depends on BTRFS_FS 103fd708b81SJosef Bacik default n 104fd708b81SJosef Bacik help 105fd708b81SJosef Bacik Enable run-time extent reference verification instrumentation. This 106fd708b81SJosef Bacik is meant to be used by btrfs developers for tracking down extent 107fd708b81SJosef Bacik reference problems or verifying they didn't break something. 108fd708b81SJosef Bacik 109fd708b81SJosef Bacik If unsure, say N. 110