dumpseg man page on Manjaro

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DUMPSEG(8)							    DUMPSEG(8)

       dumpseg - print segment information of NILFS2

       dumpseg [-hV]

       dumpseg [device] segment-number ...

       The  dumpseg  program  is an analysis tool for on-disk logs of a NILFS2
       file system found in device.  It displays the  configuration  of	 every
       log  stored  in	the segments specified by one or more segment-numbers.
       The term segment here means a contiguous lump of disk blocks giving  an
       allocation unit of NILFS2 disk space.  When device is omitted, it tries
       to find an active NILFS2 file system from /proc/mounts.

       dumpseg is a tool for debugging rather than administration.  To list  a
       summary of segments, lssu(1) is available instead.

       -h, --help
	      Display help message and exit.

       -V, --version
	      Display version and exit.

       dumpseg	shows the configuration of each log with the following fields,
       where each field is printed in the style of ``field-name = value''.

       creation time
	      Creation date and time of the log.

       nfinfo Number of file information summaries.

       finfo  File information summary. This information starts with the  fol‐
	      lowing fields:

	      ino    Inode number of the file.

	      cno    Number  of the checkpoint that the blocks included in the
		     file belong to.  For normal writings, this	 is  equal  to
		     the  latest checkpoint number.  For the writings involved
		     in garbage collection, this indicates a  past  checkpoint

		     Number  of	 blocks	 of the file written in the log.  This
		     number is a sum of the number of data blocks  and	B-tree
		     node  blocks.   The  contents of these blocks are written
		     serially in the payload part of the log.	Only  modified
		     or newly created blocks are written to each log.

		     Number of data blocks of the file written in the log.

	      Then,  for each update block in the file, the following informa‐
	      tion will follow these headings.

		     Virtual block number.  Not printed for data blocks of the
		     Disk Address Translation file (DAT file).

	      blkoff Block  offset number.  Not printed for B-tree node blocks
		     except for the DAT file.

	      level  Level of B-tree node block.  Printed  only	 for  the  DAT

		     Block address on the device.  This is not an actual field
		     in the summary but is calculated from the disk address of
		     each log.

       Koji Sato

       dumpseg	is  part  of  the  nilfs-utils	package	 and is available from

       nilfs(8), lssu(1).

nilfs-utils version 2.2		   Apr 2014			    DUMPSEG(8)

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