243 lines
9.2 KiB
ReStructuredText
243 lines
9.2 KiB
ReStructuredText
btrfs-inspect-internal(8)
|
|
=========================
|
|
|
|
SYNOPSIS
|
|
--------
|
|
|
|
**btrfs inspect-internal** <subcommand> <args>
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
|
|
This command group provides an interface to query internal information. The
|
|
functionality ranges from a simple UI to an ioctl or a more complex query that
|
|
assembles the result from several internal structures. The latter usually
|
|
requires calls to privileged ioctls.
|
|
|
|
SUBCOMMAND
|
|
----------
|
|
|
|
dump-super [options] <device> [device...]
|
|
Show btrfs superblock information stored on given devices in textual form.
|
|
By default the first superblock is printed, more details about all copies or
|
|
additional backup data can be printed.
|
|
|
|
Besides verification of the filesystem signature, there are no other sanity
|
|
checks. The superblock checksum status is reported, the device item and
|
|
filesystem UUIDs are checked and reported.
|
|
|
|
.. note::
|
|
|
|
The meaning of option *-s* has changed in version 4.8 to be consistent
|
|
with other tools to specify superblock copy rather the offset. The old way still
|
|
works, but prints a warning. Please update your scripts to use *--bytenr*
|
|
instead. The option *-i* has been deprecated.
|
|
|
|
``Options``
|
|
|
|
-f|--full
|
|
print full superblock information, including the system chunk array and backup roots
|
|
-a|--all
|
|
print information about all present superblock copies (cannot be used together
|
|
with *-s* option)
|
|
|
|
-i <super>
|
|
(deprecated since 4.8, same behaviour as *--super*)
|
|
--bytenr <bytenr>
|
|
specify offset to a superblock in a non-standard location at *bytenr*, useful
|
|
for debugging (disables the *-f* option)
|
|
|
|
If there are multiple options specified, only the last one applies.
|
|
|
|
-F|--force
|
|
attempt to print the superblock even if a valid BTRFS signature is not found;
|
|
the result may be completely wrong if the data does not resemble a superblock
|
|
-s|--super <bytenr>
|
|
(see compatibility note above)
|
|
|
|
specify which mirror to print, valid values are 0, 1 and 2 and the superblock
|
|
must be present on the device with a valid signature, can be used together with
|
|
*--force*
|
|
|
|
dump-tree [options] <device> [device...]
|
|
Dump tree structures from a given device in textual form, expand keys to human
|
|
readable equivalents where possible.
|
|
This is useful for analyzing filesystem state or inconsistencies and has
|
|
a positive educational effect on understanding the internal filesystem structure.
|
|
|
|
.. note::
|
|
Contains file names, consider that if you're asked to send the dump for
|
|
analysis. Does not contain file data.
|
|
|
|
``Options``
|
|
|
|
-e|--extents
|
|
print only extent-related information: extent and device trees
|
|
-d|--device
|
|
print only device-related information: tree root, chunk and device trees
|
|
-r|--roots
|
|
print only short root node information, i.e. the root tree keys
|
|
-R|--backups
|
|
same as *--roots* plus print backup root info, i.e. the backup root keys and
|
|
the respective tree root block offset
|
|
-u|--uuid
|
|
print only the uuid tree information, empty output if the tree does not exist
|
|
|
|
-b <block_num>
|
|
print info of the specified block only, can be specified multiple times
|
|
|
|
--follow
|
|
use with *-b*, print all children tree blocks of *<block_num>*
|
|
--dfs
|
|
(default up to 5.2)
|
|
|
|
use depth-first search to print trees, the nodes and leaves are
|
|
intermixed in the output
|
|
|
|
--bfs
|
|
(default since 5.3)
|
|
|
|
use breadth-first search to print trees, the nodes are printed before all
|
|
leaves
|
|
|
|
--hide-names
|
|
print a placeholder *HIDDEN* instead of various names, useful for developers to
|
|
inspect the dump while keeping potentially sensitive information hidden
|
|
|
|
This is:
|
|
|
|
* directory entries (files, directories, subvolumes)
|
|
* default subvolume
|
|
* extended attributes (name, value)
|
|
* hardlink names (if stored inside another item or as extended references in standalone items)
|
|
|
|
.. note::
|
|
Lengths are not hidden because they can be calculated from the item size anyway.
|
|
|
|
--csum-headers
|
|
print b-tree node checksums stored in headers (metadata)
|
|
--csum-items
|
|
print checksums stored in checksum items (data)
|
|
--noscan
|
|
do not automatically scan the system for other devices from the same
|
|
filesystem, only use the devices provided as the arguments
|
|
-t <tree_id>
|
|
print only the tree with the specified ID, where the ID can be numerical or
|
|
common name in a flexible human readable form
|
|
|
|
The tree id name recognition rules:
|
|
|
|
* case does not matter
|
|
* the C source definition, e.g. BTRFS_ROOT_TREE_OBJECTID
|
|
* short forms without BTRFS\_ prefix, without _TREE and _OBJECTID suffix, e.g. ROOT_TREE, ROOT
|
|
* convenience aliases, e.g. DEVICE for the DEV tree, CHECKSUM for CSUM
|
|
* unrecognized ID is an error
|
|
|
|
inode-resolve [-v] <ino> <path>
|
|
(needs root privileges)
|
|
|
|
resolve paths to all files with given inode number *ino* in a given subvolume
|
|
at *path*, i.e. all hardlinks
|
|
|
|
``Options``
|
|
|
|
-v
|
|
(deprecated) alias for global *-v* option
|
|
|
|
logical-resolve [-Pvo] [-s <bufsize>] <logical> <path>
|
|
(needs root privileges)
|
|
|
|
resolve paths to all files at given *logical* address in the linear filesystem space
|
|
|
|
``Options``
|
|
|
|
-P
|
|
skip the path resolving and print the inodes instead
|
|
-o
|
|
ignore offsets, find all references to an extent instead of a single block.
|
|
Requires kernel support for the V2 ioctl (added in 4.15). The results might need
|
|
further processing to filter out unwanted extents by the offset that is supposed
|
|
to be obtained by other means.
|
|
-s <bufsize>
|
|
set internal buffer for storing the file names to *bufsize*, default is 64KiB,
|
|
maximum 16MiB. Buffer sizes over 64Kib require kernel support for the V2 ioctl
|
|
(added in 4.15).
|
|
-v
|
|
(deprecated) alias for global *-v* option
|
|
|
|
map-swapfile [options] <file>
|
|
(needs root privileges)
|
|
|
|
Find device-specific physical offset of *file* that can be used for
|
|
hibernation. Also verify that the *file* is suitable as a swapfile.
|
|
See also command :command:`btrfs filesystem mkswapfile` and the
|
|
:doc:`Swapfile feature<Swapfile>` description.
|
|
|
|
.. note::
|
|
Do not use :command:`filefrag` or *FIEMAP* ioctl values reported as
|
|
physical, this is different due to internal filesystem mappings.
|
|
The hibernation expects offset relative to the physical block device.
|
|
|
|
``Options``
|
|
|
|
-r|--resume-offset
|
|
print only the value suitable as resume offset for file */sys/power/resume_offset*
|
|
|
|
min-dev-size [options] <path>
|
|
(needs root privileges)
|
|
|
|
return the minimum size the device can be shrunk to, without performing any
|
|
resize operation, this may be useful before executing the actual resize operation
|
|
|
|
``Options``
|
|
|
|
--id <id>
|
|
specify the device *id* to query, default is 1 if this option is not used
|
|
|
|
rootid <path>
|
|
for a given file or directory, return the containing tree root id, but for a
|
|
subvolume itself return its own tree id (i.e. subvol id)
|
|
|
|
.. note::
|
|
The result is undefined for the so-called empty subvolumes (identified by
|
|
inode number 2), but such a subvolume does not contain any files anyway
|
|
|
|
subvolid-resolve <subvolid> <path>
|
|
(needs root privileges)
|
|
|
|
resolve the absolute path of the subvolume id *subvolid*
|
|
|
|
tree-stats [options] <device>
|
|
(needs root privileges)
|
|
|
|
Print sizes and statistics of trees. This takes a device as an argument
|
|
and not a mount point unlike other commands.
|
|
|
|
.. note::
|
|
In case the the filesystem is still mounted it's possible to
|
|
run the command but the results may be inaccurate or various
|
|
errors may be printed in case there are ongoing writes to the
|
|
filesystem. A warning is printed in such case.
|
|
|
|
``Options``
|
|
|
|
-b
|
|
Print raw numbers in bytes.
|
|
|
|
EXIT STATUS
|
|
-----------
|
|
|
|
**btrfs inspect-internal** returns a zero exit status if it succeeds. Non zero is
|
|
returned in case of failure.
|
|
|
|
AVAILABILITY
|
|
------------
|
|
|
|
**btrfs** is part of btrfs-progs. Please refer to the documentation at
|
|
`https://btrfs.readthedocs.io <https://btrfs.readthedocs.io>`_.
|
|
|
|
SEE ALSO
|
|
--------
|
|
|
|
:doc:`mkfs.btrfs(8)<mkfs.btrfs>`
|