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