xfs_logprint(8) System Manager's Manual xfs_logprint(8)
NAME
xfs_logprint - print the log of an XFS filesystem
SYNOPSIS
xfs_logprint [ options ] device
DESCRIPTION
xfs_logprint prints the log of an XFS filesystem (see xfs(5)). The de-
vice argument is the pathname of the partition or logical volume con-
taining the filesystem. The device can be a regular file if the -f op-
tion is used. 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 transac-
tional view prints only the portion of the log that pertains to recov-
ery. In other words, it prints out complete transactions between the
tail and the head. This view tries to display each transaction 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 overlaps 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.
OPTIONS
-b Extract and print buffer information. Only used in transactional
view.
-c Attempt to continue when an error is detected.
-C filename
Copy the log from the filesystem to the file filename. The log
itself is not printed.
-d Dump the log from front to end, printing where each log record is
located on disk.
-D Do not 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 Specifies that the filesystem image to be processed is stored in
a regular file at device (see the mkfs.xfs(8) -d file option).
This might happen if an image copy of a filesystem has been made
into an ordinary file with xfs_copy(8).
-l logdev
External log device. Only for those filesystems which use an ex-
ternal log.
-i Extract and print inode information. Only used in transactional
view.
-q Extract and print quota information. Only used in transactional
view.
-n Do not try and interpret log data; just interpret log header in-
formation.
-o Also print buffer data in hex. Normally, buffer data is just de-
coded, so better information can be printed.
-s start-block
Override any notion of where to start printing.
-t Print out the transactional view.
-v Print "overwrite" data.
-V Prints the version number and exits.
SEE ALSO
mkfs.xfs(8), mount(8).
xfs_logprint(8)
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