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 23 * Integrated multiple device support, with several raid algorithms 24 * Offline filesystem check 25 * Efficient incremental backup and FS mirroring 26 * Online filesystem defragmentation 27 28For more information please refer to the wiki 29 30 https://btrfs.wiki.kernel.org 31 32that maintains information about administration tasks, frequently asked 33questions, use cases, mount options, comprehensible changelogs, features, 34manual pages, source code repositories, contacts etc. 35