jfs_debugfs
NAME
SYNOPSIS
DESCRIPTION
COMMANDS
REPORTING BUGS
SEE ALSO
AUTHORS
NAME
jfs_debugfs − shell-type JFS file system editor
SYNOPSIS
jfs_debugfs device
DESCRIPTION
jfs_debugfs is a program which can be used to perform various low-level actions on a JFS formatted device.
device is the special file name corresponding to the actual device to be edited (e.g. /dev/hdb1).
jfs_debugfs must be run as root.
COMMANDS
a[lter]
replaces the data located at the
b[tree]
* not implemented yet *
displays one node of the btree located at
SUBCOMMANDS:
l => visit left sibling
m => modify current node
p => visit parent node
r => visit right sibling
[0-9] => visit the n’th child node
x => exit subcommand mode
cb[blfsck]
displays the area used by ClearBadBlockList for communication with fsck
SUBCOMMANDS:
m => modify entries
x => exit subcommand mode
dir[ectory]
displays the directory entries at
SUBCOMMANDS:
m => modify entries
x => exit subcommand mode
d[isplay] [
displays
a => ascii
b => block allocation map
d => decimal
i => inode
I => inode allocation map
s => superblock
x => hexadecimal
X => extent allocation descriptor
|
dm[ap] |
displays aggregate disk (block) map |
SUBCOMMANDS
m => modify map fields
f => display free count
t => display tree levels
x => exit subcommand mode
dt[ree]
displays root of the directory btree located at
SUBCOMMANDS
l => visit left sibling
m => modify current node
p => visit parent node (not parent directory)
r => visit right sibling
[0-9] => visit the n’th child node
x => exit subcommand mode
fsckw[sphdr]
displays the header of the fsck workspace in the aggregate
SUBCOMMANDS:
m => modify entries
x => exit subcommand mode
h[elp] [
displays help for
if no command is given, all possible commands are displayed
ia[g] [
displays IAG information for
a is to use the primary aggregate inode table
s is to use the secondary aggregate inode table
SUBCOMMANDS
e => display/modify inode extents map
m => modify IAG
p => display/modify persistent map
w => display/modify working map
x => exit subcommand mode
i[node] [
displays inode information for
a is to use the primary aggregate inode table
s is to use the secondary aggregate inode table
SUBCOMMANDS
a => display/modify inode’s ACL
m => modify inode
x => exit subcommand mode
logs[uper]
displays the journal log superblock and enters subcommand mode
SUBCOMMANDS
m => modify journal log superblock
x => exit subcommand mode
|
q[uit] |
exits jfs_debugfs |
se[t] [
* not implemented yet *
set user-defined
if no arguments are given, displays all set variables
su[perblock] [p | s]
displays superblock data
p displays the primary superblock
s displays the secondary superblock
SUBCOMMANDS:
m => modify entries
x => exit subcommand mode
s2p[erblock] [p | s]
displays alternate superblock data
p displays the primary superblock
s displays the secondary superblock
SUBCOMMANDS:
m => modify entries
x => exit subcommand mode
u[nset]
* not implemented yet *
deletes user-defined
xt[ree]
displays root of the non-directory btree located at
SUBCOMMANDS
l => visit left sibling
m => modify current node
p => visit parent node (not parent directory)
r => visit right sibling
[0-9] => visit the n’th child node
x => exit subcommand mode
REPORTING BUGS
If you find a bug in JFS or jfs_debugfs, please report it via the bug tracking system (“Report Bugs” section) of the JFS project web site:
http://jfs.sourceforge.net/
Please send as much pertinent information as possible, including the complete output of running jfs_fsck with the −v and −n options on the JFS device.
SEE ALSO
jfs_fsck(8), jfs_mkfs(8), jfs_fscklog(8), jfs_logdump(8), jfs_tune(8),
AUTHORS
Barry Arndt (barndt@us.ibm.com)
William Braswell, Jr.
jfs_debugfs is maintained by IBM.
See the JFS project web site for more details:
http://jfs.sourceforge.net/