1335debeeSAlexey Dobriyanconfig BTRFS_FS 2aa825914SDavid Sterba tristate "Btrfs filesystem support" 314a958e6SFilipe David Borba Manana select CRYPTO 414a958e6SFilipe David Borba Manana select CRYPTO_CRC32C 5335debeeSAlexey Dobriyan select ZLIB_INFLATE 6335debeeSAlexey Dobriyan select ZLIB_DEFLATE 7a6fa6faeSLi Zefan select LZO_COMPRESS 8a6fa6faeSLi Zefan select LZO_DECOMPRESS 953b381b3SDavid Woodhouse select RAID6_PQ 1010e78e3aSTomasz Torcz select XOR_BLOCKS 1183fe27eaSPranith Kumar select SRCU 1253b381b3SDavid Woodhouse 13335debeeSAlexey Dobriyan help 144204617dSDavid Sterba Btrfs is a general purpose copy-on-write filesystem with extents, 154204617dSDavid Sterba writable snapshotting, support for multiple devices and many more 164204617dSDavid Sterba features focused on fault tolerance, repair and easy administration. 17335debeeSAlexey Dobriyan 184204617dSDavid Sterba The filesystem disk format is no longer unstable, and it's not 194204617dSDavid Sterba expected to change unless there are strong reasons to do so. If there 204204617dSDavid Sterba is a format change, file systems with a unchanged format will 214204617dSDavid Sterba continue to be mountable and usable by newer kernels. 224204617dSDavid Sterba 234204617dSDavid Sterba For more information, please see the web pages at 244204617dSDavid Sterba http://btrfs.wiki.kernel.org. 25335debeeSAlexey Dobriyan 26335debeeSAlexey Dobriyan To compile this file system support as a module, choose M here. The 27335debeeSAlexey Dobriyan module will be called btrfs. 28335debeeSAlexey Dobriyan 29335debeeSAlexey Dobriyan If unsure, say N. 30bef62ef3SChristian Hesse 31bef62ef3SChristian Hesseconfig BTRFS_FS_POSIX_ACL 32bef62ef3SChristian Hesse bool "Btrfs POSIX Access Control Lists" 33bef62ef3SChristian Hesse depends on BTRFS_FS 34bef62ef3SChristian Hesse select FS_POSIX_ACL 35bef62ef3SChristian Hesse help 36bef62ef3SChristian Hesse POSIX Access Control Lists (ACLs) support permissions for users and 37bef62ef3SChristian Hesse groups beyond the owner/group/world scheme. 38bef62ef3SChristian Hesse 39bef62ef3SChristian Hesse To learn more about Access Control Lists, visit the POSIX ACLs for 40bef62ef3SChristian Hesse Linux website <http://acl.bestbits.at/>. 41bef62ef3SChristian Hesse 42bef62ef3SChristian Hesse If you don't know what Access Control Lists are, say N 43c975dd46SStefan Behrens 44c975dd46SStefan Behrensconfig BTRFS_FS_CHECK_INTEGRITY 45c975dd46SStefan Behrens bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 46c975dd46SStefan Behrens depends on BTRFS_FS 47c975dd46SStefan Behrens help 48c975dd46SStefan Behrens Adds code that examines all block write requests (including 49c975dd46SStefan Behrens writes of the super block). The goal is to verify that the 50c975dd46SStefan Behrens state of the filesystem on disk is always consistent, i.e., 51c975dd46SStefan Behrens after a power-loss or kernel panic event the filesystem is 52c975dd46SStefan Behrens in a consistent state. 53c975dd46SStefan Behrens 54c975dd46SStefan Behrens If the integrity check tool is included and activated in 55c975dd46SStefan Behrens the mount options, plenty of kernel memory is used, and 56c975dd46SStefan Behrens plenty of additional CPU cycles are spent. Enabling this 57c975dd46SStefan Behrens functionality is not intended for normal use. 58c975dd46SStefan Behrens 59c975dd46SStefan Behrens In most cases, unless you are a btrfs developer who needs 60c975dd46SStefan Behrens to verify the integrity of (super)-block write requests 61c975dd46SStefan Behrens during the run of a regression test, say N 6274255aa0SJosef Bacik 6374255aa0SJosef Bacikconfig BTRFS_FS_RUN_SANITY_TESTS 6474255aa0SJosef Bacik bool "Btrfs will run sanity tests upon loading" 6574255aa0SJosef Bacik depends on BTRFS_FS 6674255aa0SJosef Bacik help 6774255aa0SJosef Bacik This will run some basic sanity tests on the free space cache 6874255aa0SJosef Bacik code to make sure it is acting as it should. These are mostly 69a26a8746SMichael Witten regression tests and are only really interesting to btrfs 70a26a8746SMichael Witten developers. 7174255aa0SJosef Bacik 7274255aa0SJosef Bacik If unsure, say N. 7374255aa0SJosef Bacik 746d49ba1bSEric Sandeenconfig BTRFS_DEBUG 756d49ba1bSEric Sandeen bool "Btrfs debugging support" 766d49ba1bSEric Sandeen depends on BTRFS_FS 776d49ba1bSEric Sandeen help 786d49ba1bSEric Sandeen Enable run-time debugging support for the btrfs filesystem. This may 796d49ba1bSEric Sandeen enable additional and expensive checks with negative impact on 806d49ba1bSEric Sandeen performance, or export extra information via sysfs. 816d49ba1bSEric Sandeen 826d49ba1bSEric Sandeen If unsure, say N. 832e17c7c6SJosef Bacik 842e17c7c6SJosef Bacikconfig BTRFS_ASSERT 852e17c7c6SJosef Bacik bool "Btrfs assert support" 862e17c7c6SJosef Bacik depends on BTRFS_FS 872e17c7c6SJosef Bacik help 882e17c7c6SJosef Bacik Enable run-time assertion checking. This will result in panics if 892e17c7c6SJosef Bacik any of the assertions trip. This is meant for btrfs developers only. 902e17c7c6SJosef Bacik 912e17c7c6SJosef Bacik If unsure, say N. 92