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NAME | SYNOPSIS | DESCRIPTION | SUBCOMMAND | EXIT STATUS | AVAILABILITY | SEE ALSO | COLOPHON |
BTRFS-INSPECT-INTE(8) Btrfs Manual BTRFS-INSPECT-INTE(8)
btrfs-inspect-internal - query various internal information
btrfs inspect-internal <subcommand> <args>
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.
dump-super [options] <device> [device...]
(replaces the standalone tool btrfs-show-super)
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>
(replaces the standalone tool btrfs-debug-tree)
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, ie. the root tree
keys
-R|--backups
same as --roots plus print backup root info, ie. 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
-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, eg. BTRFS_ROOT_TREE_OBJECTID
· short forms without BTRFS_ prefix, without _TREE and
_OBJECTID suffix, eg. ROOT_TREE, ROOT
· convenience aliases, eg. 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, ie. all hardlinks
Options
-v
verbose mode, print count of returned paths and ioctl()
return value
logical-resolve [-Pv] [-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
-v
verbose mode, print count of returned paths and all ioctl()
return values
-s <bufsize>
set internal buffer for storing the file names to bufsize,
default is 4096, maximum 64k
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, for a subvolume itself return it’s own tree id (ie. subvol
id)
Note
The result is undefined for the so-called empty subvolumes
(identified by inode number 2), but such subvolume does not
contain any files anyway
subvolid-resolve <subvolid> <path>
(needs root privileges)
resolve the absolute path of a the subvolume id subvolid
tree-stats [options] <device>
(needs root privileges)
Print sizes and statistics of trees.
Options
-b
Print raw numbers in bytes.
btrfs inspect-internal returns a zero exit status if it succeeds. Non
zero is returned in case of failure.
btrfs is part of btrfs-progs. Please refer to the btrfs wiki
http://btrfs.wiki.kernel.org for further details.
mkfs.btrfs(8)
This page is part of the btrfs-progs (btrfs filesystem tools)
project. Information about the project can be found at
⟨https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositories⟩.
If you have a bug report for this manual page, see
⟨https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#How_do_I_report_bugs_and_issues.3F⟩.
This page was obtained from the project's upstream Git repository
⟨git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git⟩
on 2017-07-05. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-to-
date source for the page, or you have corrections or improvements to
the information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
Btrfs v4.6.1 03/12/2017 BTRFS-INSPECT-INTE(8)
Pages that refer to this page: btrfs(8), btrfs-select-super(8)