xfs_logprint(8) System Manager's Manual xfs_logprint(8)
xfs_logprint - print the log of an XFS filesystem
xfs_logprint [ options ] device-name
xfs_logprint -f [ options ] filename
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 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
Common options are:
-b Extract and print buffer information. Only used in transac-
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
-f The log is a file.
-l External log device. Only for those filesystems which use an
-i Extract and print inode information. Only used in transactional
-q Extract and print quota information. Only used in transactional
-n Do not try and interpret log data; just interpret log header
-o Also print buffer data in hex. Normally, buffer data is just
decoded, so better information can be printed.
Override any notion of where to start printing.
-t Print out the transactional view.