fsck.jfs(8)
NAME
jfs_fsck - initiate replay of the JFS transaction log, and check and repair a JFS formatted device
SYNOPSIS
jfs_fsck [ -afnpvV ] [ -j journal_device ] [ --omit_journal_replay ] [ --replay_journal_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 equivalent 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 further 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 ([email protected]) 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)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
