btrfs-progs: docs: formatting, fixups, updates
- update Status page - new features in 6.7 - more ioctls - CSS fix to wrap long lines in tables [ci skip] Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
parent
ffebbf6f2a
commit
fcd9142b67
|
|
@ -93,6 +93,16 @@ features see :doc:`Status<Status>` page.
|
|||
finalizing the directory, the cache also gains significant speedups (up
|
||||
to 10x).
|
||||
|
||||
6.7 - raid-stripe-tree
|
||||
New tree for logical mapping, allows some RAID modes for zoned mode.
|
||||
|
||||
6.7 - simplified quota accounting
|
||||
A simplified mode of qgroups accounting
|
||||
|
||||
6.7 - temporary fsid
|
||||
Mount of cloned devices is now possible, the filesystem will get a new
|
||||
randomly generated UUID on mount
|
||||
|
||||
5.x
|
||||
---
|
||||
|
||||
|
|
|
|||
|
|
@ -5,43 +5,45 @@ BTRFS is a modern copy on write (COW) filesystem for Linux aimed at
|
|||
implementing advanced features while also focusing on fault tolerance, repair
|
||||
and easy administration. Its main features and benefits are:
|
||||
|
||||
* Snapshots which do not make a full copy of the files
|
||||
* Built-in volume management, support for software-based RAID 0, RAID 1, RAID 10 and others
|
||||
* Self-healing - checksums for data and metadata, automatic detection of silent data corruptions
|
||||
* Snapshots which do not make a full copy of the files
|
||||
* Built-in volume management, support for software-based RAID 0, RAID 1, RAID 10 and others
|
||||
* Self-healing - checksums for data and metadata, automatic detection of silent data corruptions
|
||||
|
||||
Feature overview:
|
||||
|
||||
* Extent based file storage
|
||||
* 2\ :sup:`64` byte == 16 EiB maximum file size (practical limit is 8 EiB due to Linux VFS)
|
||||
* Space-efficient packing of small files
|
||||
* Space-efficient indexed directories
|
||||
* Dynamic inode allocation
|
||||
* Writable snapshots, read-only snapshots
|
||||
* Subvolumes (separate internal filesystem roots)
|
||||
* Checksums on data and metadata (crc32c, xxhash, sha256, blake2b)
|
||||
* Compression (ZLIB, LZO, ZSTD), heuristics
|
||||
* Integrated multiple device support
|
||||
* File Striping
|
||||
* File Mirroring
|
||||
* File Striping+Mirroring
|
||||
* Single and Dual Parity implementations (experimental, not production-ready)
|
||||
* SSD (flash storage) awareness (TRIM/Discard for reporting free blocks for
|
||||
reuse) and optimizations (e.g. avoiding unnecessary seek optimizations,
|
||||
sending writes in clusters, even if they are from unrelated files. This
|
||||
results in larger write operations and faster write throughput)
|
||||
* Efficient incremental backup
|
||||
* Background scrub process for finding and repairing errors of files with redundant copies
|
||||
* Online filesystem defragmentation
|
||||
* Offline filesystem check
|
||||
* In-place conversion of existing ext2/3/4 and reiserfs file systems
|
||||
* Seed devices. Create a (readonly) filesystem that acts as a template to seed
|
||||
other Btrfs filesystems. The original filesystem and devices are included as
|
||||
a readonly starting point for the new filesystem. Using copy on write, all
|
||||
modifications are stored on different devices; the original is unchanged.
|
||||
* Subvolume-aware quota support
|
||||
* Send/receive of subvolume changes
|
||||
* Efficient incremental filesystem mirroring
|
||||
* Batch, or out-of-band deduplication (happens after writes, not during)
|
||||
* Swapfile support
|
||||
* Tree-checker, post-read and pre-write metadata verification
|
||||
* Zoned mode support (SMR/ZBC/ZNS friendly allocation)
|
||||
* Extent based file storage
|
||||
* 2\ :sup:`64` byte == 16 EiB maximum file size (practical limit is 8 EiB due to Linux VFS)
|
||||
* Space-efficient packing of small files
|
||||
* Space-efficient indexed directories
|
||||
* Dynamic inode allocation
|
||||
* Writable snapshots, read-only snapshots
|
||||
* Subvolumes (separate internal filesystem roots)
|
||||
* Checksums on data and metadata (crc32c, xxhash, sha256, blake2b)
|
||||
* Compression (ZLIB, LZO, ZSTD), heuristics
|
||||
* Integrated multiple device support
|
||||
|
||||
* File Striping
|
||||
* File Mirroring
|
||||
* File Striping+Mirroring
|
||||
* Single and Dual Parity implementations (experimental, not production-ready)
|
||||
* SSD (flash storage) awareness (TRIM/Discard for reporting free blocks for
|
||||
reuse) and optimizations (e.g. avoiding unnecessary seek optimizations,
|
||||
sending writes in clusters, even if they are from unrelated files. This
|
||||
results in larger write operations and faster write throughput)
|
||||
* Efficient incremental backup
|
||||
* Background scrub process for finding and repairing errors of files with redundant copies
|
||||
* Online filesystem defragmentation
|
||||
* Offline filesystem check
|
||||
* In-place conversion of existing ext2/3/4 and reiserfs file systems
|
||||
* Seed devices. Create a (readonly) filesystem that acts as a template to seed
|
||||
other Btrfs filesystems. The original filesystem and devices are included as
|
||||
a readonly starting point for the new filesystem. Using copy on write, all
|
||||
modifications are stored on different devices; the original is unchanged.
|
||||
* Subvolume-aware quota support
|
||||
* Send/receive of subvolume changes
|
||||
|
||||
* Efficient incremental filesystem mirroring
|
||||
* Batch, or out-of-band deduplication (happens after writes, not during)
|
||||
* Swapfile support
|
||||
* Tree-checker, post-read and pre-write metadata verification
|
||||
* Zoned mode support (SMR/ZBC/ZNS friendly allocation)
|
||||
|
|
|
|||
|
|
@ -13,7 +13,7 @@ in meeting your performance expectations for your specific workload.
|
|||
Combination of features can vary in performance, the table does not
|
||||
cover all possibilities.
|
||||
|
||||
**The table is based on the latest released linux kernel: 6.5**
|
||||
**The table is based on the latest released linux kernel: 6.6**
|
||||
|
||||
The columns for each feature reflect the status of the implementation
|
||||
in following ways:
|
||||
|
|
@ -123,6 +123,10 @@ in following ways:
|
|||
- :statusok:`OK`
|
||||
- OK
|
||||
-
|
||||
* - Temporary UUID
|
||||
- 6.7
|
||||
- 6.7
|
||||
-
|
||||
* - :doc:`Seeding<Seeding-device>`
|
||||
- :statusok:`OK`
|
||||
- OK
|
||||
|
|
@ -131,6 +135,10 @@ in following ways:
|
|||
- :statusmok:`mostly OK`
|
||||
- mostly OK
|
||||
- qgroups with many snapshots slows down balance
|
||||
* - :doc:`Quotas, simple qgroups<Qgroups>`
|
||||
- 6.7
|
||||
- 6.7
|
||||
- simplified qgroup accounting, better performance
|
||||
* - :doc:`Swapfile<Swapfile>`
|
||||
- :statusok:`OK`
|
||||
- n/a
|
||||
|
|
@ -226,7 +234,11 @@ converted later).
|
|||
- :statusok:`OK`
|
||||
- OK
|
||||
-
|
||||
* - :ref:`Block group tree`<mkfs-feature-block-group-tree>`
|
||||
* - :ref:`Block group tree<mkfs-feature-block-group-tree>`
|
||||
- :statusok:`OK`
|
||||
- OK
|
||||
-
|
||||
* - :ref:`Raid stripe tree<mkfs-feature-raid-stripe-tree>`
|
||||
- :statusok:`OK`
|
||||
- OK
|
||||
-
|
||||
|
|
@ -321,7 +333,7 @@ are unaffected by the zoned device constraints.
|
|||
- Notes
|
||||
* - Boot
|
||||
- :statusincompat:`incompatible`
|
||||
- The blocks where partition table is stored is used for super block
|
||||
- The blocks where partition table is stored are used for super block
|
||||
* - Mixed block groups
|
||||
- :statusincompat:`incompatible`
|
||||
- Interleaving data and metadata would lead to out of order write
|
||||
|
|
@ -343,6 +355,12 @@ are unaffected by the zoned device constraints.
|
|||
* - Free space tree
|
||||
- :statusok:`supported`
|
||||
-
|
||||
* - Block group tree
|
||||
- :statusok:`supported`
|
||||
-
|
||||
* - Raid stripe tree
|
||||
- :statusok:`supported`
|
||||
- Allows to use RAID in zoned mode
|
||||
* - Filesystem resize
|
||||
- :statusok:`supported`
|
||||
-
|
||||
|
|
@ -352,9 +370,12 @@ are unaffected by the zoned device constraints.
|
|||
* - Metadata UUID change
|
||||
- :statusok:`supported`
|
||||
-
|
||||
* - RAID (all)
|
||||
* - RAID0, RAID1*
|
||||
- :statusok:`supported`
|
||||
- requires `raid-stripe-tree`
|
||||
* - RAID56
|
||||
- not implemented
|
||||
- This requires raid-stripe-tree feature which is still work in progress
|
||||
- will be supported once raid-stripe-tree support is implemented
|
||||
* - discard
|
||||
- not implemented
|
||||
- May not be required at all due to automatic zone reclaim
|
||||
|
|
|
|||
|
|
@ -2,6 +2,14 @@
|
|||
max-width: 1200px !important;
|
||||
}
|
||||
|
||||
.wy-table-responsive {
|
||||
white-space: normal !important;
|
||||
}
|
||||
|
||||
.wy-table-responsive table td, .wy-table-responsive table th {
|
||||
white-space: normal !important;
|
||||
}
|
||||
|
||||
.green {
|
||||
color: green;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -240,10 +240,7 @@ LIST OF IOCTLS
|
|||
* - Name
|
||||
- Description
|
||||
- Data
|
||||
* - BTRFS_IOC_SUBVOL_CREATE
|
||||
- (obsolete) create a subvolume
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - BTRFS_IOC_SNAP_CREATE
|
||||
* - :ref:`BTRFS_IOC_SNAP_CREATE<BTRFS_IOC_SNAP_CREATE>`
|
||||
- (obsolete) create a snapshot of a subvolume
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - BTRFS_IOC_DEFRAG
|
||||
|
|
@ -252,9 +249,9 @@ LIST OF IOCTLS
|
|||
* - BTRFS_IOC_RESIZE
|
||||
-
|
||||
-
|
||||
* - BTRFS_IOC_SCAN_DEV
|
||||
-
|
||||
-
|
||||
* - :ref:`BTRFS_IOC_SCAN_DEV<BTRFS_IOC_SCAN_DEV>`
|
||||
- scan and register a given device path with filesystem module
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - :ref:`BTRFS_IOC_SYNC<BTRFS_IOC_SYNC>`
|
||||
- Sync the filesystem, possibly process queued up work
|
||||
- NULL
|
||||
|
|
@ -273,12 +270,12 @@ LIST OF IOCTLS
|
|||
* - BTRFS_IOC_CLONE_RANGE
|
||||
-
|
||||
-
|
||||
* - BTRFS_IOC_SUBVOL_CREATE
|
||||
-
|
||||
-
|
||||
* - BTRFS_IOC_SNAP_DESTROY
|
||||
-
|
||||
-
|
||||
* - :ref:`BTRFS_IOC_SUBVOL_CREATE<BTRFS_IOC_SUBVOL_CREATE>`
|
||||
- (obsolete) create a subvolume
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - :ref:`BTRFS_IOC_SNAP_DESTROY<BTRFS_IOC_SNAP_DESTROY>`
|
||||
- (obsolete) delete a subvolume
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - BTRFS_IOC_DEFRAG_RANGE
|
||||
-
|
||||
-
|
||||
|
|
@ -291,9 +288,9 @@ LIST OF IOCTLS
|
|||
* - BTRFS_IOC_INO_LOOKUP
|
||||
-
|
||||
-
|
||||
* - BTRFS_IOC_DEFAULT_SUBVOL
|
||||
-
|
||||
-
|
||||
* - :ref:`BTRFS_IOC_DEFAULT_SUBVOL<BTRFS_IOC_DEFAULT_SUBVOL>`
|
||||
- set the default subvolume id
|
||||
- uint64_t
|
||||
* - BTRFS_IOC_SPACE_INFO
|
||||
-
|
||||
-
|
||||
|
|
@ -421,29 +418,7 @@ LIST OF IOCTLS
|
|||
DETAILED DESCRIPTION
|
||||
--------------------
|
||||
|
||||
BTRFS_IOC_SUBVOL_CREATE
|
||||
~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
.. note::
|
||||
obsoleted by :ref:`BTRFS_IOC_SUBVOL_CREATE_V2<BTRFS_IOC_SUBVOL_CREATE_V2>`
|
||||
|
||||
*(since: 3.0, obsoleted: 4.0)* Create a subvolume.
|
||||
|
||||
.. list-table::
|
||||
:header-rows: 1
|
||||
|
||||
* - Field
|
||||
- Description
|
||||
* - ioctl fd
|
||||
- file descriptor of the parent directory of the new subvolume
|
||||
* - ioctl args
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - args.fd
|
||||
- ignored
|
||||
* - args.name
|
||||
- name of the subvolume, although the buffer can be almost 4k, the file
|
||||
size is limited by Linux VFS to 255 characters and must not contain a slash
|
||||
('/')
|
||||
.. _BTRFS_IOC_SNAP_CREATE:
|
||||
|
||||
BTRFS_IOC_SNAP_CREATE
|
||||
~~~~~~~~~~~~~~~~~~~~~
|
||||
|
|
@ -466,10 +441,34 @@ BTRFS_IOC_SNAP_CREATE
|
|||
- file descriptor of any directory inside the subvolume to snapshot,
|
||||
must be on the same filesystem
|
||||
* - args.name
|
||||
- name of the subvolume, although the buffer can be almost 4k, the file
|
||||
- name of the subvolume, although the buffer can be almost 4KiB, the file
|
||||
size is limited by Linux VFS to 255 characters and must not contain a slash
|
||||
('/')
|
||||
|
||||
.. _BTRFS_IOC_SCAN_DEV:
|
||||
|
||||
BTRFS_IOC_SCAN_DEV
|
||||
~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Scan and register a given device in the filesystem module, which can be later
|
||||
used for automatic device and filesystem association at mount time. This
|
||||
operates on the control device, not files from a mounted filesystem.
|
||||
Can be safely called repeatedly with same device path.
|
||||
|
||||
.. list-table::
|
||||
:header-rows: 1
|
||||
|
||||
* - Field
|
||||
- Description
|
||||
* - ioctl fd
|
||||
- file descriptor of the control device :file:`/dev/btrfs-control`
|
||||
* - ioctl args
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - args.fd
|
||||
- ignored
|
||||
* - args.name
|
||||
- full path of the device
|
||||
|
||||
.. _BTRFS_IOC_SYNC:
|
||||
|
||||
BTRFS_IOC_SYNC
|
||||
|
|
@ -489,6 +488,76 @@ subvolume cleaning or queued defragmentation.
|
|||
* - ioctl args
|
||||
- NULL
|
||||
|
||||
.. _BTRFS_IOC_SUBVOL_CREATE:
|
||||
|
||||
BTRFS_IOC_SUBVOL_CREATE
|
||||
~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
.. note::
|
||||
obsoleted by :ref:`BTRFS_IOC_SUBVOL_CREATE_V2<BTRFS_IOC_SUBVOL_CREATE_V2>`
|
||||
|
||||
*(since: 3.0, obsoleted: 4.0)* Create a subvolume.
|
||||
|
||||
.. list-table::
|
||||
:header-rows: 1
|
||||
|
||||
* - Field
|
||||
- Description
|
||||
* - ioctl fd
|
||||
- file descriptor of the parent directory of the new subvolume
|
||||
* - ioctl args
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - args.fd
|
||||
- ignored
|
||||
* - args.name
|
||||
- name of the subvolume, although the buffer can be almost 4KiB, the file
|
||||
size is limited by Linux VFS to 255 characters and must not contain a slash
|
||||
('/')
|
||||
|
||||
.. _BTRFS_IOC_SNAP_DESTROY:
|
||||
|
||||
BTRFS_IOC_SNAP_DESTROY
|
||||
~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
.. note::
|
||||
obsoleted by :ref:`BTRFS_IOC_SNAP_DESTROY_V2<BTRFS_IOC_SNAP_DESTROY_V2>`
|
||||
|
||||
*(since: 2.6.33, obsoleted: 5.7)* Delete a subvolume.
|
||||
|
||||
.. list-table::
|
||||
:header-rows: 1
|
||||
|
||||
* - Field
|
||||
- Description
|
||||
* - ioctl fd
|
||||
- file descriptor of the parent directory of the new subvolume
|
||||
* - ioctl args
|
||||
- :ref:`struct btrfs_ioctl_vol_args<struct_btrfs_ioctl_vol_args>`
|
||||
* - args.fd
|
||||
- ignored
|
||||
* - args.name
|
||||
- name of the subvolume, although the buffer can be almost 4KiB, the file
|
||||
size is limited by Linux VFS to 255 characters and must not contain a slash
|
||||
('/')
|
||||
|
||||
.. _BTRFS_IOC_DEFAULT_SUBVOL:
|
||||
|
||||
BTRFS_IOC_DEFAULT_SUBVOL
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Set the given subvolume id as the default one when mounting the filesystem
|
||||
without `subvol=path` or `subvolid=id` options.
|
||||
|
||||
.. list-table::
|
||||
:header-rows: 1
|
||||
|
||||
* - Field
|
||||
- Description
|
||||
* - ioctl fd
|
||||
- file descriptor of the directory inside which to create the new snapshot
|
||||
* - ioctl args
|
||||
- numeric value of subvolume to become default (uint64_t)
|
||||
|
||||
.. _BTRFS_IOC_SNAP_CREATE_V2:
|
||||
|
||||
BTRFS_IOC_SNAP_CREATE_V2
|
||||
|
|
@ -513,7 +582,7 @@ Create a snapshot of a subvolume.
|
|||
* - args.flags
|
||||
- any subset of `BTRFS_SUBVOL_RDONLY` to make the new snapshot read-only,
|
||||
or `BTRFS_SUBVOL_QGROUP_INHERIT` to apply the `qgroup_inherit` field
|
||||
* - name
|
||||
* - args.name
|
||||
- the name, under the ioctl fd, for the new subvolume
|
||||
|
||||
.. _BTRFS_IOC_SUBVOL_CREATE_V2:
|
||||
|
|
@ -547,7 +616,7 @@ BTRFS_IOC_SUBVOL_CREATE_V2
|
|||
(:ref:`struct btrfs_qgroup_inherit<struct_btrfs_qgroup_inherit>`) and
|
||||
limits (:ref:`struct btrfs_qgroup_limit<struct_btrfs_qgroup_limit>`)
|
||||
* - name
|
||||
- name of the subvolume, although the buffer can be almost 4k, the file
|
||||
- name of the subvolume, although the buffer can be almost 4KiB, the file
|
||||
size is limited by Linux VFS to 255 characters and must not contain a
|
||||
slash ('/')
|
||||
|
||||
|
|
|
|||
|
|
@ -333,6 +333,18 @@ block-group-tree
|
|||
enabled at *mkfs* time is possible, see :doc:`btrfstune`. Online
|
||||
conversion is not possible.
|
||||
|
||||
.. _mkfs-feature-raid-stripe-tree:
|
||||
|
||||
raid-stripe-tree
|
||||
(kernel support since 6.7)
|
||||
|
||||
New tree for logical file extent mapping where the physical mapping
|
||||
may not match on multiple devices. this is now used in zoned mode to
|
||||
implement RAID0/RAID1* profiles, but can be used in non-zoned mode as
|
||||
well. The support for RAID56 is in development and will eventually
|
||||
fix the problems with the current implementation. This is a backward
|
||||
incompatible feature and has to be enabled at mkfs time.
|
||||
|
||||
squota
|
||||
(kernel support since 6.7)
|
||||
|
||||
|
|
|
|||
|
|
@ -1171,7 +1171,7 @@ enum btrfs_err_code {
|
|||
struct btrfs_ioctl_vol_args)
|
||||
#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
|
||||
struct btrfs_ioctl_vol_args)
|
||||
#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
|
||||
#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 5, \
|
||||
struct btrfs_ioctl_vol_args)
|
||||
#define BTRFS_IOC_FORGET_DEV _IOW(BTRFS_IOCTL_MAGIC, 5, \
|
||||
struct btrfs_ioctl_vol_args)
|
||||
|
|
|
|||
Loading…
Reference in a new issue