1xfs_logprint(8)             System Manager's Manual            xfs_logprint(8)
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NAME

6       xfs_logprint - print the log of an XFS filesystem
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SYNOPSIS

9       xfs_logprint [ options ] device
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DESCRIPTION

12       xfs_logprint  prints  the  log  of an XFS filesystem (see xfs(5)).  The
13       device argument is the pathname of the partition or logical volume con‐
14       taining  the  filesystem.  The  device  can be a regular file if the -f
15       option is used. The contents  of  the  filesystem  remain  undisturbed.
16       There are two major modes of operation in xfs_logprint.
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18       One  mode  is  better for filesystem operation debugging.  It is called
19       the transactional view and is enabled through the -t option. The trans‐
20       actional  view  prints  only  the  portion  of the log that pertains to
21       recovery. In other words, it prints out complete  transactions  between
22       the  tail  and  the  head.  This view tries to display each transaction
23       without regard to how they are split across log records.
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25       The second mode starts printing out information from the  beginning  of
26       the  log.   Some  error blocks might print out in the beginning because
27       the last log record usually overlaps the oldest log record.  A  message
28       is  printed  when  the  physical end of the log is reached and when the
29       logical end of the log is reached. A log record view is  displayed  one
30       record at a time. Transactions that span log records may not be decoded
31       fully.
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OPTIONS

34       -b     Extract and print buffer information. Only used in transactional
35              view.
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37       -c     Attempt to continue when an error is detected.
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39       -C filename
40              Copy  the log from the filesystem to the file filename.  The log
41              itself is not printed.
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43       -d     Dump the log from front to end, printing where each  log  record
44              is located on disk.
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46       -D     Do not decode anything; just print data.
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48       -e     Exit  when  an error is found in the log. Normally, xfs_logprint
49              tries to continue and unwind from bad logs.  However,  sometimes
50              it  just  dies  in  bad  ways.   Using this option prevents core
51              dumps.
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53       -f     Specifies that the filesystem image to be processed is stored in
54              a  regular  file at device (see the mkfs.xfs(8) -d file option).
55              This might happen if an image copy of a filesystem has been made
56              into an ordinary file with xfs_copy(8).
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58       -l logdev
59              External  log  device.  Only  for those filesystems which use an
60              external log.
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62       -i     Extract and print inode information. Only used in  transactional
63              view.
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65       -q     Extract  and print quota information. Only used in transactional
66              view.
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68       -n     Do not try and interpret log data;  just  interpret  log  header
69              information.
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71       -o     Also  print  buffer  data in hex.  Normally, buffer data is just
72              decoded, so better information can be printed.
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74       -s start-block
75              Override any notion of where to start printing.
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77       -t     Print out the transactional view.
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SEE ALSO

80       mkfs.xfs(8), mount(8).
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84                                                               xfs_logprint(8)
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