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1.. SPDX-License-Identifier: GPL-2.02 3=====4BTRFS5=====6 7Btrfs is a copy on write filesystem for Linux aimed at implementing advanced8features while focusing on fault tolerance, repair and easy administration.9Jointly developed by several companies, licensed under the GPL and open for10contribution 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 files16 * Space efficient indexed directories17 * Dynamic inode allocation18 * Writable snapshots19 * Subvolumes (separate internal filesystem roots)20 * Object level mirroring and striping21 * Checksums on data and metadata (multiple algorithms available)22 * Compression (multiple algorithms available)23 * Reflink, deduplication24 * Scrub (on-line checksum verification)25 * Hierarchical quota groups (subvolume and snapshot support)26 * Integrated multiple device support, with several raid algorithms27 * Offline filesystem check28 * Efficient incremental backup and FS mirroring (send/receive)29 * Trim/discard30 * Online filesystem defragmentation31 * Swapfile support32 * Zoned mode33 * Read/write metadata verification34 * Online resize (shrink, grow)35 36For more information please refer to the documentation site or wiki37 38 https://btrfs.readthedocs.io39 40 41that maintains information about administration tasks, frequently asked42questions, use cases, mount options, comprehensible changelogs, features,43manual pages, source code repositories, contacts etc.44