1852eb3aeSDavid Sterba# SPDX-License-Identifier: GPL-2.0 2852eb3aeSDavid Sterba 3335debeeSAlexey Dobriyanconfig BTRFS_FS 4aa825914SDavid Sterba tristate "Btrfs filesystem support" 5d5178578SJohannes Thumshirn select CRYPTO 6d5178578SJohannes Thumshirn select CRYPTO_CRC32C 7314c4cd6SYueHaibing select LIBCRC32C 83951e7f0SJohannes Thumshirn select CRYPTO_XXHASH 93831bf00SJohannes Thumshirn select CRYPTO_SHA256 1078f926f7SDavid Sterba select CRYPTO_BLAKE2B 11335debeeSAlexey Dobriyan select ZLIB_INFLATE 12335debeeSAlexey Dobriyan select ZLIB_DEFLATE 13a6fa6faeSLi Zefan select LZO_COMPRESS 14a6fa6faeSLi Zefan select LZO_DECOMPRESS 155c1aab1dSNick Terrell select ZSTD_COMPRESS 165c1aab1dSNick Terrell select ZSTD_DECOMPRESS 1753b381b3SDavid Woodhouse select RAID6_PQ 1810e78e3aSTomasz Torcz select XOR_BLOCKS 1983fe27eaSPranith Kumar select SRCU 2053b381b3SDavid Woodhouse 21335debeeSAlexey Dobriyan help 224204617dSDavid Sterba Btrfs is a general purpose copy-on-write filesystem with extents, 234204617dSDavid Sterba writable snapshotting, support for multiple devices and many more 244204617dSDavid Sterba features focused on fault tolerance, repair and easy administration. 25335debeeSAlexey Dobriyan 264204617dSDavid Sterba The filesystem disk format is no longer unstable, and it's not 274204617dSDavid Sterba expected to change unless there are strong reasons to do so. If there 284204617dSDavid Sterba is a format change, file systems with a unchanged format will 294204617dSDavid Sterba continue to be mountable and usable by newer kernels. 304204617dSDavid Sterba 314204617dSDavid Sterba For more information, please see the web pages at 324204617dSDavid Sterba http://btrfs.wiki.kernel.org. 33335debeeSAlexey Dobriyan 34335debeeSAlexey Dobriyan To compile this file system support as a module, choose M here. The 35335debeeSAlexey Dobriyan module will be called btrfs. 36335debeeSAlexey Dobriyan 37335debeeSAlexey Dobriyan If unsure, say N. 38bef62ef3SChristian Hesse 39bef62ef3SChristian Hesseconfig BTRFS_FS_POSIX_ACL 40bef62ef3SChristian Hesse bool "Btrfs POSIX Access Control Lists" 41bef62ef3SChristian Hesse depends on BTRFS_FS 42bef62ef3SChristian Hesse select FS_POSIX_ACL 43bef62ef3SChristian Hesse help 44bef62ef3SChristian Hesse POSIX Access Control Lists (ACLs) support permissions for users and 45bef62ef3SChristian Hesse groups beyond the owner/group/world scheme. 46bef62ef3SChristian Hesse 47bef62ef3SChristian Hesse If you don't know what Access Control Lists are, say N 48c975dd46SStefan Behrens 49c975dd46SStefan Behrensconfig BTRFS_FS_CHECK_INTEGRITY 50c975dd46SStefan Behrens bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 51c975dd46SStefan Behrens depends on BTRFS_FS 52c975dd46SStefan Behrens help 53c975dd46SStefan Behrens Adds code that examines all block write requests (including 54c975dd46SStefan Behrens writes of the super block). The goal is to verify that the 55c975dd46SStefan Behrens state of the filesystem on disk is always consistent, i.e., 56c975dd46SStefan Behrens after a power-loss or kernel panic event the filesystem is 57c975dd46SStefan Behrens in a consistent state. 58c975dd46SStefan Behrens 59c975dd46SStefan Behrens If the integrity check tool is included and activated in 60c975dd46SStefan Behrens the mount options, plenty of kernel memory is used, and 61c975dd46SStefan Behrens plenty of additional CPU cycles are spent. Enabling this 62c975dd46SStefan Behrens functionality is not intended for normal use. 63c975dd46SStefan Behrens 64c975dd46SStefan Behrens In most cases, unless you are a btrfs developer who needs 65c975dd46SStefan Behrens to verify the integrity of (super)-block write requests 66c975dd46SStefan Behrens during the run of a regression test, say N 6774255aa0SJosef Bacik 6874255aa0SJosef Bacikconfig BTRFS_FS_RUN_SANITY_TESTS 6974255aa0SJosef Bacik bool "Btrfs will run sanity tests upon loading" 7074255aa0SJosef Bacik depends on BTRFS_FS 7174255aa0SJosef Bacik help 7274255aa0SJosef Bacik This will run some basic sanity tests on the free space cache 7374255aa0SJosef Bacik code to make sure it is acting as it should. These are mostly 74a26a8746SMichael Witten regression tests and are only really interesting to btrfs 75a26a8746SMichael Witten developers. 7674255aa0SJosef Bacik 7774255aa0SJosef Bacik If unsure, say N. 7874255aa0SJosef Bacik 796d49ba1bSEric Sandeenconfig BTRFS_DEBUG 806d49ba1bSEric Sandeen bool "Btrfs debugging support" 816d49ba1bSEric Sandeen depends on BTRFS_FS 826d49ba1bSEric Sandeen help 836d49ba1bSEric Sandeen Enable run-time debugging support for the btrfs filesystem. This may 846d49ba1bSEric Sandeen enable additional and expensive checks with negative impact on 856d49ba1bSEric Sandeen performance, or export extra information via sysfs. 866d49ba1bSEric Sandeen 876d49ba1bSEric Sandeen If unsure, say N. 882e17c7c6SJosef Bacik 892e17c7c6SJosef Bacikconfig BTRFS_ASSERT 902e17c7c6SJosef Bacik bool "Btrfs assert support" 912e17c7c6SJosef Bacik depends on BTRFS_FS 922e17c7c6SJosef Bacik help 932e17c7c6SJosef Bacik Enable run-time assertion checking. This will result in panics if 942e17c7c6SJosef Bacik any of the assertions trip. This is meant for btrfs developers only. 952e17c7c6SJosef Bacik 962e17c7c6SJosef Bacik If unsure, say N. 97fd708b81SJosef Bacik 98fd708b81SJosef Bacikconfig BTRFS_FS_REF_VERIFY 99fd708b81SJosef Bacik bool "Btrfs with the ref verify tool compiled in" 100fd708b81SJosef Bacik depends on BTRFS_FS 101fd708b81SJosef Bacik default n 102fd708b81SJosef Bacik help 103fd708b81SJosef Bacik Enable run-time extent reference verification instrumentation. This 104fd708b81SJosef Bacik is meant to be used by btrfs developers for tracking down extent 105fd708b81SJosef Bacik reference problems or verifying they didn't break something. 106fd708b81SJosef Bacik 107fd708b81SJosef Bacik If unsure, say N. 108