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 of with is the block number - given in decimal is the offset within that block - given in hexadecimal is an even-numbered string of hexadecimal digits to write to the disk b[tree] [] * not implemented yet * displays one node of the btree located at of 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] [] displays the directory entries at and enters subcommand mode is the directory's inode - given in decimal currently must be zero SUBCOMMANDS: m => modify entries x => exit subcommand mode d[isplay] [ [ [ []]]] displays objects located at the of in is the block number - given in decimal is the offset within - given in hexadecimal 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 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] [] displays root of the directory btree located at and enters a subcommand mode to navigate the btree is the directory's inode - given in decimal 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 h[elp] [] displays help for if no command is given, all possible commands are displayed ia[g] [] [a | s | ] displays IAG information for and enters subcommand mode is given in decimal a is to use the primary aggregate inode table s is to use the secondary aggregate inode table 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] [] [a | s | ] displays inode information for and enters sub‐ command mode is given in decimal a is to use the primary aggregate inode table s is to use the secondary aggregate inode table 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] [ ] * not implemented yet * set user-defined to if no arguments are given, displays all set variables must begin with an alphabetic character 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 and enters a subcommand mode to navigate the btree is the directory's inode - given in decimal 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.

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/ October 29, 2002 jfs_debugfs(8)

SEE ALSO

jfs_fsck(8), jfs_mkfs(8), jfs_fscklog(8), jfs_logdump(8), jfs_tune(8),

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