1.. SPDX-License-Identifier: GPL-2.0 2 3===== 4BTRFS 5===== 6 7Btrfs is a copy on write filesystem for Linux aimed at implementing advanced 8features while focusing on fault tolerance, repair and easy administration. 9Jointly developed by several companies, licensed under the GPL and open for 10contribution from anyone. 11 12The main Btrfs features include: 13 14 * Extent based file storage (2^64 max file size) 15 * Space efficient packing of small files 16 * Space efficient indexed directories 17 * Dynamic inode allocation 18 * Writable snapshots 19 * Subvolumes (separate internal filesystem roots) 20 * Object level mirroring and striping 21 * Checksums on data and metadata (multiple algorithms available) 22 * Compression (multiple algorithms available) 23 * Reflink, deduplication 24 * Scrub (on-line checksum verification) 25 * Hierarchical quota groups (subvolume and snapshot support) 26 * Integrated multiple device support, with several raid algorithms 27 * Offline filesystem check 28 * Efficient incremental backup and FS mirroring (send/receive) 29 * Trim/discard 30 * Online filesystem defragmentation 31 * Swapfile support 32 * Zoned mode 33 * Read/write metadata verification 34 * Online resize (shrink, grow) 35 36For more information please refer to the documentation site or wiki 37 38 https://btrfs.readthedocs.io 39 40 https://btrfs.wiki.kernel.org 41 42that maintains information about administration tasks, frequently asked 43questions, use cases, mount options, comprehensible changelogs, features, 44manual pages, source code repositories, contacts etc. 45