xfs_logprint(8) manual page
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xfs_logprint - print the log of an XFS filesystem
xfs_logprint
[ options ] device
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 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.
- -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.
- -v
- Print "overwrite" data.
- -V
- Prints the version number and exits.
mkfs.xfs(8)
, mount(8)
.
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