man > xfs_logprint(8)

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 device argument is the
       pathname of the partition or logical volume containing the filesystem. The device  can  be  a
       regular  file  if  the  -f option 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 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 old‐
       est 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 de‐
              vice (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 external 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 information.

       -o     Also  print  buffer data in hex.  Normally, buffer data is just decoded, so better in‐
              formation 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)