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BTRFS-INSPECT-INTE(8)            Btrfs Manual            BTRFS-INSPECT-INTE(8)

NAME
       btrfs-inspect-internal - query various internal information
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...]
           (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 verifictaion 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 thre's no valid BTRFS
               signature found, the result may be completely wrong if the data
               do 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:
               o   case does not matter
               o   the C source definition, eg. BTRFS_ROOT_TREE_OBJECTID
               o   short forms without BTRFS_ prefix, without _TREE and
                   _OBJECTID suffix, eg. ROOT_TREE, ROOT
               o   convenience aliases, eg. DEVICE for the DEV tree, CHECKSUM
                   for CSUM
               o   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.
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 btrfs wiki
       http://btrfs.wiki.kernel.org for further details.
SEE ALSO
       mkfs.btrfs(8)

Btrfs v4.9.1                      08/06/2017             BTRFS-INSPECT-INTE(8)