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 con-
       taining 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 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 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 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).

                                                                                                                                   xfs_logprint(8)