xfs_logprint - print the log of an XFS filesystem
SYNOPSIS
xfs_logprint [ options ] device-name
xfs_logprint -f [ options ] filename
DESCRIPTION
xfs_logprint prints the log of an XFS filesystem (see
xfs(5)). The device-name argument is the pathname of the
partition or logical volume containing the filesystem.
The contents of the filesystem remain undisturbed. There
are two major modes of operation in xfs_logprint.
One mode is better for filesystem operation debugging. It
is called the transactional view and is enabled through
the -t option. The transactional view prints only the
portion of the log that pertains to recovery. In other
words, it prints out complete transactions between the
tail and the head. This view tries to display each trans
action without regard to how they are split across log
records.
The second mode starts printing out information from the
beginning of the log. Some error blocks might print out
in the beginning because the last log record usually over
laps the oldest log record. A message is printed when the
physical end of the log is reached and when the logical
end of the log is reached. A log record view is displayed
one record at a time. Transactions that span log records
may not be decoded fully.
Common options are:
-b Extract and print buffer information. Only used in
transactional view.
-D Don't decode anything; just print data.
-e Exit when an error is found in the log. Normally,
xfs_logprint tries to continue and unwind from bad
logs. However, sometimes it just dies in bad ways.
Using this option prevents core dumps.
-f The log is a file.
-l External log device. Only for those filesystems
which use an external log.
-i Extract and print inode information. Only used in
transactional view.
-q Extract and print quota information. Only used in
transactional view.
log header information.
-o Also print buffer data in hex. Normally, buffer
data is just decoded, so better information can be
printed.
-s start-block
Override any notion of where to start printing.
-t Print out the transactional view.
SEE ALSO
mkfs.xfs(8), mount(8).
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