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 9335debeeSAlexey Dobriyan select ZLIB_INFLATE 10335debeeSAlexey Dobriyan select ZLIB_DEFLATE 11a6fa6faeSLi Zefan select LZO_COMPRESS 12a6fa6faeSLi Zefan select LZO_DECOMPRESS 135c1aab1dSNick Terrell select ZSTD_COMPRESS 145c1aab1dSNick Terrell select ZSTD_DECOMPRESS 1553b381b3SDavid Woodhouse select RAID6_PQ 1610e78e3aSTomasz Torcz select XOR_BLOCKS 1783fe27eaSPranith Kumar select SRCU 1853b381b3SDavid Woodhouse 19335debeeSAlexey Dobriyan help 204204617dSDavid Sterba Btrfs is a general purpose copy-on-write filesystem with extents, 214204617dSDavid Sterba writable snapshotting, support for multiple devices and many more 224204617dSDavid Sterba features focused on fault tolerance, repair and easy administration. 23335debeeSAlexey Dobriyan 244204617dSDavid Sterba The filesystem disk format is no longer unstable, and it's not 254204617dSDavid Sterba expected to change unless there are strong reasons to do so. If there 264204617dSDavid Sterba is a format change, file systems with a unchanged format will 274204617dSDavid Sterba continue to be mountable and usable by newer kernels. 284204617dSDavid Sterba 294204617dSDavid Sterba For more information, please see the web pages at 304204617dSDavid Sterba http://btrfs.wiki.kernel.org. 31335debeeSAlexey Dobriyan 32335debeeSAlexey Dobriyan To compile this file system support as a module, choose M here. The 33335debeeSAlexey Dobriyan module will be called btrfs. 34335debeeSAlexey Dobriyan 35335debeeSAlexey Dobriyan If unsure, say N. 36bef62ef3SChristian Hesse 37bef62ef3SChristian Hesseconfig BTRFS_FS_POSIX_ACL 38bef62ef3SChristian Hesse bool "Btrfs POSIX Access Control Lists" 39bef62ef3SChristian Hesse depends on BTRFS_FS 40bef62ef3SChristian Hesse select FS_POSIX_ACL 41bef62ef3SChristian Hesse help 42bef62ef3SChristian Hesse POSIX Access Control Lists (ACLs) support permissions for users and 43bef62ef3SChristian Hesse groups beyond the owner/group/world scheme. 44bef62ef3SChristian Hesse 45bef62ef3SChristian Hesse If you don't know what Access Control Lists are, say N 46c975dd46SStefan Behrens 47c975dd46SStefan Behrensconfig BTRFS_FS_CHECK_INTEGRITY 48c975dd46SStefan Behrens bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 49c975dd46SStefan Behrens depends on BTRFS_FS 50c975dd46SStefan Behrens help 51c975dd46SStefan Behrens Adds code that examines all block write requests (including 52c975dd46SStefan Behrens writes of the super block). The goal is to verify that the 53c975dd46SStefan Behrens state of the filesystem on disk is always consistent, i.e., 54c975dd46SStefan Behrens after a power-loss or kernel panic event the filesystem is 55c975dd46SStefan Behrens in a consistent state. 56c975dd46SStefan Behrens 57c975dd46SStefan Behrens If the integrity check tool is included and activated in 58c975dd46SStefan Behrens the mount options, plenty of kernel memory is used, and 59c975dd46SStefan Behrens plenty of additional CPU cycles are spent. Enabling this 60c975dd46SStefan Behrens functionality is not intended for normal use. 61c975dd46SStefan Behrens 62c975dd46SStefan Behrens In most cases, unless you are a btrfs developer who needs 63c975dd46SStefan Behrens to verify the integrity of (super)-block write requests 64c975dd46SStefan Behrens during the run of a regression test, say N 6574255aa0SJosef Bacik 6674255aa0SJosef Bacikconfig BTRFS_FS_RUN_SANITY_TESTS 6774255aa0SJosef Bacik bool "Btrfs will run sanity tests upon loading" 6874255aa0SJosef Bacik depends on BTRFS_FS 6974255aa0SJosef Bacik help 7074255aa0SJosef Bacik This will run some basic sanity tests on the free space cache 7174255aa0SJosef Bacik code to make sure it is acting as it should. These are mostly 72a26a8746SMichael Witten regression tests and are only really interesting to btrfs 73a26a8746SMichael Witten developers. 7474255aa0SJosef Bacik 7574255aa0SJosef Bacik If unsure, say N. 7674255aa0SJosef Bacik 776d49ba1bSEric Sandeenconfig BTRFS_DEBUG 786d49ba1bSEric Sandeen bool "Btrfs debugging support" 796d49ba1bSEric Sandeen depends on BTRFS_FS 806d49ba1bSEric Sandeen help 816d49ba1bSEric Sandeen Enable run-time debugging support for the btrfs filesystem. This may 826d49ba1bSEric Sandeen enable additional and expensive checks with negative impact on 836d49ba1bSEric Sandeen performance, or export extra information via sysfs. 846d49ba1bSEric Sandeen 856d49ba1bSEric Sandeen If unsure, say N. 862e17c7c6SJosef Bacik 872e17c7c6SJosef Bacikconfig BTRFS_ASSERT 882e17c7c6SJosef Bacik bool "Btrfs assert support" 892e17c7c6SJosef Bacik depends on BTRFS_FS 902e17c7c6SJosef Bacik help 912e17c7c6SJosef Bacik Enable run-time assertion checking. This will result in panics if 922e17c7c6SJosef Bacik any of the assertions trip. This is meant for btrfs developers only. 932e17c7c6SJosef Bacik 942e17c7c6SJosef Bacik If unsure, say N. 95fd708b81SJosef Bacik 96fd708b81SJosef Bacikconfig BTRFS_FS_REF_VERIFY 97fd708b81SJosef Bacik bool "Btrfs with the ref verify tool compiled in" 98fd708b81SJosef Bacik depends on BTRFS_FS 99fd708b81SJosef Bacik default n 100fd708b81SJosef Bacik help 101fd708b81SJosef Bacik Enable run-time extent reference verification instrumentation. This 102fd708b81SJosef Bacik is meant to be used by btrfs developers for tracking down extent 103fd708b81SJosef Bacik reference problems or verifying they didn't break something. 104fd708b81SJosef Bacik 105fd708b81SJosef Bacik If unsure, say N. 106