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    Command:

    jfs_debugfs

    
    
    
    

    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] <block> <offset> <hex_string>
                   replaces  the  data  located  at  the  <offset> of <block> with
                  <hex_string>
    
                  <block> is the block number - given in decimal
    
                  <offset> is the offset within that block - given in hexadecimal
    
                  <hex_string> is an even-numbered string of hexadecimal digits to
                  write to the disk
    
           b[tree] <block> [<offset>]
                  * not implemented yet *
                   displays  one  node of the btree located at <offset> of <block>
                  and enters a subcommand mode to navigate the btree
    
                  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] <inode_number> [<file_set>]
                  <format>
    
                  <block> is the block number - given in decimal
    
                  <offset> is the offset within <block> - given in hexadecimal
    
                  <format> is one of the following:
                   a => ascii
                   b => block allocation map
                   d => decimal
                   i => inode
                   I => inode allocation map
                   s => superblock
                   x => hexadecimal
                   X => extent allocation descriptor
    
                  <count> is the number of objects to display - given in decimal
    
           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] <inode_number> [<file_set>]
                   displays  root of the directory btree located at <inode_number>
                  and enters a subcommand mode to navigate the btree
    
                  <inode_number> is the directory's inode - given in decimal
    
                  <file_set> currently must be zero
    
                  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
    
                  s is to use the secondary aggregate inode table
    
                  <file_set> currently must be zero
    
                  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] [<inode_number>] [a | s | <file_set>]
                   displays  inode  information for <inode_number> and enters sub-
                  command mode
    
                  <inode_number> is given in decimal
    
                  a is to use the primary aggregate inode table
    
                  s is to use the secondary aggregate inode table
    
                  <file_set> currently must be zero
    
                  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] [<variable> <value>]
                  * not implemented yet *
                   set user-defined <variable> to <value>
                   if no arguments are given, displays all set variables
    
                  <variable> must begin with an alphabetic character
    
           su[perblock] [p | s]
                   displays superblock data
    
                  s displays the secondary superblock
    
                  SUBCOMMANDS:
                   m => modify entries
                   x => exit subcommand mode
    
           u[nset] <variable>
                  * not implemented yet *
                   deletes user-defined <variable>
    
           xt[ree] <inode_number> [<file_set>]
                   displays root of the non-directory btree located at <inode_num-
                  ber> and enters a subcommand mode to navigate the btree
    
                  <inode_number> is the directory's inode - given in decimal
    
                  <file_set> currently must be zero
    
                  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/
    
    
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