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