29f382042b
Enhance the sorting capabilities of 'inspect list-chunks' to allow
multiple keys. Drop the gaps, this works only for pstart and it's hard
to make it work with arbitrary sort keys.
Usage is printed by default, assuming this is an interesting info and
even if it slows down the output (due to extra lookups) it's more
convenient to print it rather than not.
The options related to usage and empty were removed.
Output changes:
- rename Number to PNumber, meaning physical number on the device
- print Devid, device number, can be also sort key
Examples:
btrfs inspect list-chunks /mnt
btrfs inspect list-chunks --sort length,usage
btrfs inspect list-chunks --sort lstart
Depending on the sort key order, the output can be wild, for that the
PNumber and LNumber give some hint where the chunks lie in their space.
Example output:
$ sudo ./btrfs inspect list-chunks --sort length,usage /
Devid PNumber Type/profile PStart Length PEnd LNumber LStart Usage%
----- ------- ----------------- --------- --------- --------- ------- --------- ------
1 7 Data/single 1.52GiB 16.00MiB 1.54GiB 69 191.68GiB 86.04
1 3 System/DUP 117.00MiB 32.00MiB 149.00MiB 40 140.17GiB 0.05
1 2 System/DUP 85.00MiB 32.00MiB 117.00MiB 39 140.17GiB 0.05
1 15 Data/single 8.04GiB 64.00MiB 8.10GiB 61 188.60GiB 94.46
1 1 Data/single 1.00MiB 84.00MiB 85.00MiB 68 191.60GiB 74.24
1 5 Metadata/DUP 341.00MiB 192.00MiB 533.00MiB 60 188.41GiB 82.58
1 4 Metadata/DUP 149.00MiB 192.00MiB 341.00MiB 59 188.41GiB 82.58
1 20 Metadata/DUP 9.29GiB 256.00MiB 9.54GiB 38 139.92GiB 57.76
1 19 Metadata/DUP 9.04GiB 256.00MiB 9.29GiB 37 139.92GiB 57.76
1 22 Metadata/DUP 9.79GiB 256.00MiB 10.04GiB 25 113.15GiB 57.93
1 21 Metadata/DUP 9.54GiB 256.00MiB 9.79GiB 24 113.15GiB 57.93
1 46 Metadata/DUP 29.29GiB 256.00MiB 29.54GiB 43 142.71GiB 62.38
Signed-off-by: David Sterba <dsterba@suse.com>
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||
|---|---|---|
| .github/workflows | ||
| check | ||
| ci | ||
| cmds | ||
| common | ||
| config | ||
| convert | ||
| crypto | ||
| Documentation | ||
| image | ||
| include | ||
| kernel-lib | ||
| kernel-shared | ||
| libbtrfs | ||
| libbtrfsutil | ||
| mkfs | ||
| tests | ||
| tune | ||
| .editorconfig | ||
| .gitignore | ||
| .readthedocs.yaml | ||
| 64-btrfs-dm.rules | ||
| 64-btrfs-zoned.rules | ||
| autogen.sh | ||
| btrfs-completion | ||
| btrfs-corrupt-block.c | ||
| btrfs-crc.c | ||
| btrfs-debugfs | ||
| btrfs-find-root.c | ||
| btrfs-map-logical.c | ||
| btrfs-sb-mod.c | ||
| btrfs-select-super.c | ||
| btrfs.c | ||
| CHANGES | ||
| configure.ac | ||
| COPYING | ||
| fsck.btrfs | ||
| inject-error | ||
| INSTALL | ||
| Makefile | ||
| Makefile.extrawarn | ||
| Makefile.inc.in | ||
| README.md | ||
| show-blocks | ||
| VERSION | ||
Btrfs-progs
Userspace utilities to manage btrfs filesystems. License: GPLv2.
Btrfs is a copy on write (COW) filesystem for Linux aimed at implementing advanced features while focusing on fault tolerance, repair and easy administration.
This repository hosts following utilities and also documentation:
- btrfs — the main administration tool (manual page)
- mkfs.btrfs — utility to create the filesystem (manual page)
- all-in-one binary in the busybox style with mkfs.btrfs, btrfs-image and other tools built-in (standalone tools)
- libbtrfsutil (LGPL v2.1) — C and python 3 bindings, see libbtrfsutil/README.md for more
- manual pages and documentation source published at btrfs.readthedocs.io (RTD)
See INSTALL for build instructions, tests/README.md for testing information and ci/README.md for CI information.
Release cycle
The major version releases are time-based and follow the cycle of the linux kernel releases. The cycle usually takes 2 months. A minor version releases may happen in the meantime if there are bug fixes or minor useful improvements queued.
The release tags are signed with a GPG key ID F2B4 1200 C54E FB30 380C 1756 C565 D5F9 D76D 583B,
release tarballs are hosted at kernel.org.
See file CHANGES or changelogs on RTD.
Releases with changelog are also published at Github release page.
Static binaries
For each release there are static binaries of btrfs and btrfs.box provided.
These can be used in rescue environments and are built for x86_64
architecture (with maximum backward compatibility), inside the Github Actions
workflow.
The btrfs.box is an all-in-one tool in the busybox
style, the functionality is determined by the binary names (either symlink,
hradlink or a file copy).
Feature compatibility
The btrfs-progs of version X.Y declare support of kernel features of the same version. New progs on old kernel are expected to work, limited only by features provided by the kernel.
Build compatibility
Build is supported on the GNU C library as the primary target, and on the musl libc.
The supported compilers are gcc (minimal version 4.8) and clang (minimal version 3.4).
Build tests are done on several distributions, see Github actions workflow.
Reporting bugs
There are several ways, each has its own specifics and audience that can give feedback or work on a fix. The following list is sorted in the order of preference:
- Github issue tracker
- to the mailing list linux-btrfs@vger.kernel.org -- (not required to subscribe), beware that the mail might get overlooked in other traffic
- IRC (irc.libera.chat #btrfs) -- good for discussions eg. if a bug is already known, but reports could miss developers' attention
- please don't use https://bugzilla.kernel.org for btrfs-progs bugs
Development
The development takes place in the mailing list (linux-btrfs@vger.kernel.org) or at Github (issues, pull requests). Changes should be split to logical parts if possible, documentation may be included in the same patch as to code or separately.
The development model of btrfs-progs shares a lot with the kernel model. The
- one logical change per patch: e.g. not mixing bugfixes, cleanups, features etc., sometimes it's not clear and will be usually pointed out during reviews
- proper subject line: e.g. prefix with btrfs-progs: subpart, ... ,
descriptive yet not too long, see
git log --onelinefor some inspiration - proper changelog: the changelogs are often missing or lacking explanation why the change was made, or how is something broken, what are user-visible effects of the bug or the fix, how does an improvement help or the intended usecase
- the Signed-off-by line is not mandatory for less significant changes
(typos, documentation) but is desired as this documents who authored the
change, you can read more about the
The Developer's Certificate of Origin (chapter 11)
- if you are not used to the signed-off style, your contributions won't be rejected just because of it's missing, the Author: tag will be added as a substitute in order to allow contributions without much bothering with formalities
Pull requests
The pull requests on Github may be used for code or documentation contributions. There are basic build checks enabled in the Github actions CI for pull requests. The status can be checked at the workflow page.
- open a PR against branches devel or master
- push update to the same branch if you need to
- close the PR in case it's wrong, a mistake or needs rework
- if you're sure the changes don't need a CI build verification, please add
[skip ci]to the changelog
Source code coding style and preferences follow the
kernel coding style.
You can find the editor settings in .editorconfig and use the
EditorConfig plugin to let your editor use that,
or update your editor settings manually.
Testing
The documentation for writing and running tests can be found in tests/ and continuous integration/container images in ci/.
Development branches are tested by Github Action workflows.
Code coverage provided by codecov.io can be found here.
Documentation updates
Documentation fixes or updates do not need much explanation so sticking to the code rules in the previous section is not necessary. GitHub pull requests are OK, patches could be sent to me directly and not required to be also in the mailing list. Pointing out typos via IRC also works, although might get accidentally lost in the noise.
Documentation sources are written in RST and built by sphinx.
Third-party sources
Build dependencies are listed in INSTALL. Implementation of checksum/hash functions is provided by copies of the respective sources to avoid adding dependencies that would make deployments in rescue or limited environments harder. The implementations are portable and there are optimized versions for some architectures. Optionally it's possible to use libgcrypt, libsodium, libkcapi, Botan or OpenSSL implementations.
The builtin implemtations uses the following sources: CRC32C, XXHASH, SHA256, BLAKE2.
Some other code is borrowed from kernel, eg. the raid5 tables or data structure implementation (list, rb-tree).