1 .. SPDX-License-Identifier: GPL-2.0 2 3 ===== 4 BTRFS 5 ===== 6 7 Btrfs is a copy on write filesystem for Linux aimed at implementing advanced 8 features while focusing on fault tolerance, repair and easy administration. 9 Jointly developed by several companies, licensed under the GPL and open for 10 contribution from anyone. 11 12 The 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 36 For more information please refer to the documentation site or wiki 37 38 https://btrfs.readthedocs.io 39 40 41 that maintains information about administration tasks, frequently asked 42 questions, use cases, mount options, comprehensible changelogs, features, 43 manual pages, source code repositories, contacts etc.
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