1debugfs.ocfs2(8) OCFS2 Manual Pages debugfs.ocfs2(8)
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6 debugfs.ocfs2 - OCFS2 file system debugger.
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9 debugfs.ocfs2 [-f cmdfile] [-R command] [-s backup] [-nwV?] [device]
10 debugfs.ocfs2 -l [tracebit ... [allow|off|deny]] ...
12 debugfs.ocfs2 -d, --decode lockname
14 debugfs.ocfs2 -e, --encode lock_type block_num [generation | parent]
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19 The debugfs.ocfs2 program is an interactive file system debugger useful
20 in displaying on-disk OCFS2 filesystem structures on the specified
21 device.
22
25 -d, --decode lockname
26 Display the information encoded in the lockname.
27 -e, --encode lock_type block_num [generation | parent]
30 Display the lockname obtained by encoding the arguments pro‐
31 vided.
32 -f, --file cmdfile
35 Executes the debugfs commands in cmdfile.
36 -i, --image
39 Specifies device is an o2image file created by o2image tool.
40 -l [tracebit ... [allow|off|deny]] ...
43 Control OCFS2 filesystem tracing by enabling and disabling trace
44 bits. Do debugfs.ocfs2 -l to get the list of all trace bits.
45 -n, --noprompt
48 Hide prompt.
49 -R, --request command
52 Executes a single debugfs command.
53 -s, --superblock backup-number
56 mkfs.ocfs2 makes upto 6 backup copies of the superblock at off‐
57 sets 1G, 4G, 16G, 64G, 256G and 1T depending on the size of the
58 volume. Use this option to specify the backup, 1 thru 6, to use
59 to open the volume.
60 -w, --write
63 Opens the filesystem in RW mode. By default the filesystem is
64 opened in RO mode.
65 -V, --version
68 Display version and exit.
69 -?, --help
72 Displays help and exit.
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76 Many debugfs.ocfs2 commands take a filespec as an argument to specify
77 an inode (as opposed to a pathname) in the filesystem which is cur‐
78 rently opened by debugfs.ocfs2. The filespec argument may be specified
79 in two forms. The first form is an inode number or lockname surrounded
80 by angle brackets, e.g., <32>. The second form is a pathname; if the
81 pathname is prefixed by a forward slash ('/'), then it is interpreted
82 relative to the root of the filesystem which is currently opened by
83 debugfs.ocfs2. If not, the path is interpreted relative to the current
84 working directory as maintained by debugfs.ocfs2, which can be modified
85 using the command cd. If the pathname is prefixed by a double forward
86 slash ('//'), then it is interpreted relative to the root of the system
87 directory of the filesystem opened by debugfs.ocfs2.
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91 Locknames are specially formatted strings used by the file system to
92 uniquely identify objects in the filesystem. Most locknames used by
93 OCFS2 are generated using the inode number and its generation number
94 and can be decoded using the decode command or used directly in place
95 of an inode number in commands requiring a filespec. Like inode num‐
96 bers, locknames need to be enclosed in angle brackets, e.g.,
97 <M000000000000000040c40c044069cf>. To generate a lockname for a given
98 object, use the encode command.
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102 This is a list of the commands which debugfs.ocfs2 supports.
103 bmap filespec logical_block
106 Display the physical block number corresponding to the logical
107 block number logical_block in the inode filespec.
108 cat filespec
111 Dump the contents of inode filespec to stdout.
112 cd filespec
115 Change the current working directory to filespec.
116 chroot filespec
119 Change the root directory to be the directory filespec.
120 close Close the currently opened filesystem.
123 controld dump
126 Display information obtained from ocfs2_controld.
127 curdev Show the currently open device.
130 decode <lockname>
133 Display the inode number encoded in the lockname.
134 dirblocks <filespec>
137 Display the directory blocks associated with the given filespec.
138 dlm_locks [-f <file>] [-l] [<lockname(s)>]...
141 Display the status of all lock resources in the o2dlm domain
142 that the file system is a member of. This command expects the
143 debugfs filesystem to be mounted as mount -t debugfs debugfs
144 /sys/kernel/debug. Use lockname(s) to limit the output to the
145 given lock resources, -l to include contents of the lock value
146 block and -f <file> to specify a saved copy of /sys/ker‐
147 nel/debug/o2dlm/<DOMAIN>/locking_state.
148 dump [-p] filespec outfile
151 Dump the contents of the inode filespec to the output file out‐
152 file. If the -p is given, set the owner, group, timestamps and
153 permissions information on outfile to match those of filespec.
154 encode filespec
157 Display the lockname for the filespec.
158 extent block#
161 Display the contents of the extent structure at block#.
162 findpath [<lockname>|<inode#>]
165 Display the pathname for the inode specified by lockname or
166 inode#. This command does not display all the hard-linked paths
167 for the inode.
168 fs_locks [-f <file>] [-l] [-B] [<lockname(s)>]...
171 Display the status of all locks known by the file system. This
172 command expects the debugfs filesystem to be mounted as mount -t
173 debugfs debugfs /sys/kernel/debug. Use lockname(s) to limit the
174 output to the given lock resources, -B to limit the output to
175 only the busy locks, -l to include contents of the lock value
176 block and -f <file> to specify a saved copy of /sys/ker‐
177 nel/debug/ocfs2/<UUID>/locking_state.
178 group block#
181 Display the contents of the group descriptor at block#.
182 hb Display the contents of the heartbeat system file.
185 help, ?
188 Print the list of commands understood by debugfs.ocfs2.
189 icheck block# ...
192 Display the inodes that use the one or more blocks specified on
193 the command line. If the inode is a regular file, also display
194 the corresponding logical block offset.
195 lcd directory
198 Change the current working directory of the debugfs.ocfs2
199 process to the directory on the native filesystem.
200 locate [<lockname>|<inode#>] ...
203 Display all pathnames for the inode(s) specified by locknames or
204 inode#s.
205 logdump node#
208 Display the contents of the journal for node node#.
209 ls [-l] filespec
212 Print the listing of the files in the directory filespec. The
213 -l flag will list files in the long format.
214 ncheck [<lockname>|<inode#>] ...
217 See locate.
218 open device
221 Open the filesystem on device.
222 quit, q
225 Quit debugfs.ocfs2.
226 rdump [-v] filespec outdir
229 Recursively dump directory filespec and all its contents
230 (including regular files, symbolic links and other directories)
231 into the outdir which should be an existing directory on the
232 native filesystem.
233 slotmap
236 Display the contents of the slotmap system file.
237 stat filespec
240 Display the contents of the inode structure for the filespec.
241 stats [-h] [-s backup-number]
244 Display the contents of the superblock. Use -s to display a spe‐
245 cific backup superblock. Use -h to hide the inode.
246 xattr [-v] <filespec>
249 Display extended attributes associated with the given filespec.
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253 This tool has been modelled after debugfs, a debugging tool for ext2.
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257 mkfs.ocfs2(8) fsck.ocfs2(8) tunefs.ocfs2(8) mounted.ocfs2(8) ocfs2con‐
258 sole(8) o2image(8) o2cb(7)
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262 Oracle Corporation
263
266 Copyright © 2004, 2009 Oracle. All rights reserved.
267Version 1.4.3 April 2009 debugfs.ocfs2(8)