table of contents
other versions
- jessie 3.17-1.1
- jessie-backports 4.7.3-1~bpo8+1
- stretch 4.7.3-1
- stretch-backports 4.13.3-1~bpo9+1
BTRFS-INSPECT-INTE(8) | Btrfs Manual | BTRFS-INSPECT-INTE(8) |
NAME¶
btrfs-inspect-internal - query various internal informationSYNOPSIS¶
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
dump-tree [options] <device>
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
(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
inode-resolve [-v] <ino> <path>
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
(needs root privileges)
resolve paths to all files with given inode number ino in a given
subvolume at path, ie. all hardlinks
Options
-v
logical-resolve [-Pv] [-s <bufsize>] <logical>
<path>
verbose mode, print count of returned paths and ioctl()
return value
(needs root privileges)
resolve paths to all files at given logical address in the linear
filesystem space
Options
-P
min-dev-size [options] <path>
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
(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>
rootid <path>
specify the device id to query, default is 1 if
this option is not used
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)10/02/2016 | Btrfs v4.7.3 |