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debugfs.ocfs2

debugfs.ocfs2

Section: OCFS2 Manual Pages (8) Updated: September 2010
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NAME

debugfs.ocfs2 - OCFS2 file system debugger.  

SYNOPSIS

debugfs.ocfs2 [-f cmdfile] [-R command] [-s backup] [-nwV?] [device]
debugfs.ocfs2 -l [tracebit ... [allow|off|deny]] ...
debugfs.ocfs2 -d, --decode lockname
debugfs.ocfs2 -e, --encode lock_type block_num [generation | parent]

 

DESCRIPTION

The debugfs.ocfs2 program is an interactive file system debugger useful in displaying on-disk OCFS2 filesystem structures on the specified device.

 

OPTIONS

-d, --decode lockname
Display the information encoded in the lockname.

-e, --encode lock_type block_num [generation | parent]
Display the lockname obtained by encoding the arguments provided.

-f, --file cmdfile
Executes the debugfs commands in cmdfile.

-i, --image
Specifies device is an o2image file created by o2image tool.

-l [tracebit ... [allow|off|deny]] ...
Control OCFS2 filesystem tracing by enabling and disabling trace bits. Do debugfs.ocfs2 -l to get the list of all trace bits.

-n, --noprompt
Hide prompt.

-R, --request command
Executes a single debugfs command.

-s, --superblock backup-number
mkfs.ocfs2 makes upto 6 backup copies of the superblock at offsets 1G, 4G, 16G, 64G, 256G and 1T depending on the size of the volume. Use this option to specify the backup, 1 thru 6, to use to open the volume.

-w, --write
Opens the filesystem in RW mode. By default the filesystem is opened in RO mode.

-V, --version
Display version and exit.

-?, --help
Displays help and exit.

 

SPECIFYING FILES

Many debugfs.ocfs2 commands take a filespec as an argument to specify an inode (as opposed to a pathname) in the filesystem which is currently opened by debugfs.ocfs2. The filespec argument may be specified in two forms. The first form is an inode number or lockname surrounded by angle brackets, e.g., <32>. The second form is a pathname; if the pathname is prefixed by a forward slash ('/'), then it is interpreted relative to the root of the filesystem which is currently opened by debugfs.ocfs2. If not, the path is interpreted relative to the current working directory as maintained by debugfs.ocfs2, which can be modified using the command cd. If the pathname is prefixed by a double forward slash ('//'), then it is interpreted relative to the root of the system directory of the filesystem opened by debugfs.ocfs2.

 

LOCKNAMES

Locknames are specially formatted strings used by the file system to uniquely identify objects in the filesystem. Most locknames used by OCFS2 are generated using the inode number and its generation number and can be decoded using the decode command or used directly in place of an inode number in commands requiring a filespec. Like inode numbers, locknames need to be enclosed in angle brackets, e.g., <M000000000000000040c40c044069cf>. Use the encode command to generate all possible locknames for an object.

 

COMMANDS

This is a list of the commands which debugfs.ocfs2 supports.

bmap filespec logical_block
Display the physical block number corresponding to the logical block number logical_block in the inode filespec.

cat filespec
Dump the contents of inode filespec to stdout.

cd filespec
Change the current working directory to filespec.

chroot filespec
Change the root directory to be the directory filespec.

close
Close the currently opened filesystem.

controld dump
Display information obtained from ocfs2_controld.

curdev
Show the currently open device.

decode <lockname>
Display the inode number encoded in the lockname.

dirblocks <filespec>
Display the directory blocks associated with the given filespec.

dlm_locks [-f <file>] [-l] [<lockname(s)>]...
Display the status of all lock resources in the o2dlm domain that the file system is a member of. This command expects the debugfs filesystem to be mounted as mount -t debugfs debugfs /sys/kernel/debug. Use lockname(s) to limit the output to the given lock resources, -l to include contents of the lock value block and -f <file> to specify a saved copy of /sys/kernel/debug/o2dlm/<DOMAIN>/locking_state.

dump [-p] filespec outfile
Dump the contents of the inode filespec to the output file outfile. If the -p is given, set the owner, group, timestamps and permissions information on outfile to match those of filespec.

dx_dump filespec
Display the indexed directory information for the given directory.

dx_leaf <block#>
Display the contents of the given indexed directory leaf block.

dx_root <block#>
Display the contents of the given indexed directory root block.

dx_space filespec
Display the directory free space list.

encode filespec
Display the lockname for the filespec.

extent block#
Display the contents of the extent structure at block#.

findpath [<lockname>|<inode#>]
Display the pathname for the inode specified by lockname or inode#. This command does not display all the hard-linked paths for the inode.

frag filespec
Display the inode's number of extents to clusters ratio.

fs_locks [-f <file>] [-l] [-B] [<lockname(s)>]...
Display the status of all locks known by the file system. This command expects the debugfs filesystem to be mounted as mount -t debugfs debugfs /sys/kernel/debug. Use lockname(s) to limit the output to the given lock resources, -B to limit the output to only the busy locks, -l to include contents of the lock value block and -f <file> to specify a saved copy of /sys/kernel/debug/ocfs2/<UUID>/locking_state.

group block#
Display the contents of the group descriptor at block#.

hb
Display the contents of the heartbeat system file.

help, ?
Print the list of commands understood by debugfs.ocfs2.

icheck block# ...
Display the inodes that use the one or more blocks specified on the command line. If the inode is a regular file, also display the corresponding logical block offset.

lcd directory
Change the current working directory of the debugfs.ocfs2 process to the directory on the native filesystem.

locate [<lockname>|<inode#>] ...
Display all pathnames for the inode(s) specified by locknames or inode#s.

logdump node#
Display the contents of the journal for node node#.

ls [-l] filespec
Print the listing of the files in the directory filespec. The -l flag will list files in the long format.

ncheck [<lockname>|<inode#>] ...
See locate.

open device
Open the filesystem on device.

quit, q
Quit debugfs.ocfs2.

rdump [-v] filespec outdir
Recursively dump directory filespec and all its contents (including regular files, symbolic links and other directories) into the outdir which should be an existing directory on the native filesystem.

refcount [-e] filespec
Display the refcount block, and optionally its tree, of the specified inode.

slotmap
Display the contents of the slotmap system file.

stat [-t|-T] filespec
Display the contents of the inode structure for the filespec. The -t ("traverse") option selects traversal of the inode's metadata. The extent tree, chain list, or other extra metadata will be dumped. This is the default. The -T option turns off traversal to reduce the I/O required when basic inode information is needed.

stats [-h] [-s backup-number]
Display the contents of the superblock. Use -s to display a specific backup superblock. Use -h to hide the inode.

xattr [-v] <filespec>
Display extended attributes associated with the given filespec.

 

ACKNOWLEDGEMENT

This tool has been modelled after debugfs, a debugging tool for ext2.

 

SEE ALSO

mkfs.ocfs2(8) fsck.ocfs2(8) tunefs.ocfs2(8) mounted.ocfs2(8) ocfs2console(8) o2image(8) o2cb(7)

 

AUTHOR

Oracle Corporation

 

COPYRIGHT

Copyright © 2004, 2010 Oracle. All rights reserved.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SPECIFYING FILES
LOCKNAMES
COMMANDS
ACKNOWLEDGEMENT
SEE ALSO
AUTHOR
COPYRIGHT

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Time: 22:01:30 GMT, April 16, 2011