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 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.

           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.

           print full superblock information, including the system chunk
           array and backup roots

           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

           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.

           contains file names, consider that if you're asked to send the
           dump for analysis. Does not contain file data.

           print only extent-related information: extent and device trees

           print only device-related information: tree root, chunk and
           device trees

           print only short root node information, ie. the root tree keys

           same as --roots plus print backup root info, ie. the backup
           root keys and the respective tree root block offset

           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


           verbose mode, print count of returned paths and ioctl() return

   logical-resolve [-Pv] [-s <bufsize>] <logical> <path>
       (needs root privileges)

       resolve paths to all files at given logical address in the linear
       filesystem space


           skip the path resolving and print the inodes instead

           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


       --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)

           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.


           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 for further details.



More Linux Commands

perlstyle(1) - Perl style guide (Commands - Linux man page)
Each programmer will, of course, have his or her own preferences in regards to formatting, but there are some general guidelines that will make your programs ea

gnutls_openpgp_privkey_get_pk_algorithm(3) - API function...
gnutls_openpgp_privkey_get_pk_algorithm.3 - This function will return the public key algorithm of an OpenPGP certificate. If bits is non null, it should have en

Tcl_CreateNamespace(3) - manipulate namespaces (Man Page)...
Namespaces are hierarchic naming contexts that can contain commands and variables. They also maintain a list of patterns that describes what commands are export

getresgid(2) - get real, effective and saved user/group IDs
getresuid() returns the real UID, the effective UID, and the saved set-user-ID of the calling process, in the arguments ruid, euid, and suid, respectively. getr

tnameserv(1) - (unknown subject) (Commands - Linux man page)
This document discusses using the Java IDL Transient Naming Service, tnameserv. Java IDL also includes the Object Request Broker Daemon (ORBD). ORBD is a daemon

gnutls_rsa_params_import_raw(3) - API function (Man Page)...
gnutls_rsa_params_import_raw.3 - This function will replace the parameters in the given structure. The new parameters should be stored in the appropriate gnutls

gnutls_x509_crl_set_crt_serial(3) - API function (Man Page)
gnutls_x509_crl_set_crt_serial.3 - This function will set a revoked certificates serial number to the CRL. RETURNS On success, GNUTLS_E_SUCCESS (0) is returned,

gjarsigner(1) - Java ARchive (JAR) file signing and verifica
When the first form is used, the tool signs the designated JAR file. The second form, on the other hand, is used to verify a previously signed JAR file. FILE is

tiffdither(1) convert a greyscale image to bilevel using dit
tiffdither converts a single channel 8-bit greyscale image to a bilevel image using Floyd-Steinberg error propagation with thresholding. OPTIONS -c Specify the

glGetTexEnvfv(3gl) - return texture environment parameters
glGetTexEnv returns in params selected values of a texture environment that was specified with glTexEnv. target specifies a texture environment. Currently, only

SDL_JoyAxisEvent(3) - Joystick axis motion event structure
SDL_JoyAxisEvent is a member of the SDL_Event union and is used when an event of type SDL_JOYAXISMOTION is reported. A SDL_JOYAXISMOTION event occurs when ever

ldapexop(1) - issue LDAP extended operations (Man Page).....
ldapexop issues the LDAP extended operation specified by oid or one of the special keywords whoami, cancel, or refresh. Additional data for the extended operati

We can't live, work or learn in freedom unless the software we use is free.