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jfs_fsck(8)			 JFS utility - file system check		      jfs_fsck(8)

NAME
       jfs_fsck  - initiate replay of the JFS transaction log, and check and repair a JFS format-
       ted device

SYNOPSIS
       jfs_fsck [ -afnpvV ] [ -j journal_device ]  [  --omit_journal_replay  ]	[  --replay_jour-
       nal_only ] device

DESCRIPTION
       jfs_fsck  is  used  to  replay  the  JFS transaction log, check a JFS formatted device for
       errors, and fix any errors found.

       device is the special file name corresponding to the actual device  to  be  checked  (e.g.
       /dev/hdb1).

       jfs_fsck must be run as root.

WARNING
       jfs_fsck  should  only  be used to check an unmounted file system or a file system that is
       mounted READ ONLY.  Using jfs_fsck to check a file system mounted  other  than  READ  ONLY
       could seriously damage the file system!

OPTIONS
       If no options are selected, the default is -p.

       -a     Autocheck  mode  -  Replay  the  transaction  log.  Do not continue fsck processing
	      unless the aggregate state is dirty or the log replay failed.  Functionally equiva-
	      lent  to	-p.   Autocheck  mode is typically the default mode used when jfs_fsck is
	      called at boot time.

       -f     Replay the transaction log and force checking  even  if  the  file  system  appears
	      clean.  Repair all problems automatically.

       -j journal_device
	      Specify the journal device.

       -n     Open the file system read only.  Do not replay the transaction log.  Report errors,
	      but do not repair them.

       --omit_journal_replay
	      Omit the replay of the transaction log.  This option should not be used unless as a
	      last resort (i.e.  the log has been severely corrupted and replaying it causes fur-
	      ther problems).

       -p     Automatically repair ("preen") the file system.  Replay the  transaction	log.   Do
	      not  continue fsck processing unless the aggregate state is dirty or the log replay
	      failed.  Functionally equivalent to -a.

       --replay_journal_only
	      Only replay the transaction log.	Do not continue with a full file system check  if
	      the  replay fails or if the file system is still dirty even after a journal replay.
	      In general, this option should only be used for  debugging  purposes  as	it  could
	      leave the file system in an unmountable state.  This option cannot be used with -f,
	      -n, or --omit_journal_replay.

       -v     Verbose messaging - print details and debug statements to stdout.

       -V     Print version information and exit (regardless of any other chosen options).

EXAMPLES
       Check the 3rd partition on the 2nd hard disk, print extended information to stdout, replay
       the  transaction  log, force complete jfs_fsck checking, and give permission to repair all
       errors:

	      jfs_fsck -v -f /dev/hdb3

       Check the 5th partition on the 1st hard disk, and report, but do not repair, any errors:

	      jfs_fsck -n /dev/hda5

EXIT CODE
       The exit code returned by jfs_fsck represents one of the following conditions:

	0     No errors

	1     File system errors corrected and/or transaction log replayed successfully

	2     File system errors corrected, system should be rebooted if file system was mounted

	4     File system errors left uncorrected

	8     Operational error

	16    Usage or syntax error

	128   Shared library error

REPORTING BUGS
       If you find a bug in JFS or jfs_fsck,  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 option on the JFS device.

SEE ALSO
       fsck(8), jfs_mkfs(8), jfs_fscklog(8), jfs_tune(8), jfs_logdump(8), jfs_debugfs(8)

AUTHORS
       Barry Arndt  (barndt@us.ibm.com)
       William Braswell, Jr.

       jfs_fsck is maintained by IBM.
       See the JFS project web site for more details:
       http://jfs.sourceforge.net/

					 October 29, 2002			      jfs_fsck(8)
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