Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
xfs_bmap(8)		    System Manager's Manual		   xfs_bmap(8)

       xfs_bmap	- print	block mapping for an XFS file

       xfs_bmap	[ -adlpv ] [ -n	num_extents ] file
       xfs_bmap	-V

       xfs_bmap	prints the map of disk blocks used by files in an XFS filesys-
       tem.  The map lists each	extent used by the file, as well as regions in
       the  file that do not have any corresponding blocks (holes).  Each line
       of the listings takes the following form:

	      extent: [startoffset..endoffset]:	startblock..endblock

       Holes are marked	by replacing the startblock..endblock with hole.   All
       the  file  offsets  and disk blocks are in units	of 512-byte blocks, no
       matter what the filesystem's block size is.

       -a     If this option is	specified, information about the file's	attri-
	      bute fork	is printed instead of the default data fork.

       -d     If  portions  of	the file have been migrated offline by a DMAPI
	      application, a DMAPI read	event will be generated	to bring those
	      portions back online before the disk block map is	printed.  How-
	      ever if the -d option is used, no	DMAPI read event will be  gen-
	      erated for a DMAPI file and offline portions will	be reported as

       -l     If this option is	used, then

		   <nblocks>  blocks

	      will be appended to each line.  nblocks is the length of the ex-
	      tent described on	the line in units of 512-byte blocks.

	      This flag	has no effect if the -v	option is used.

       -n num_extents
	      If this option is	given, xfs_bmap	obtains	the extent list	of the
	      file in groups of	num_extents extents. In	 the  absence  of  -n,
	      xfs_bmap	queries	 the  system  for the number of	extents	in the
	      file and uses that value to compute the group size.

       -p     If this option is	used, xfs_bmap obtains all unwritten (preallo-
	      cated) extents that do not contain written data. With the	-v op-
	      tion, the	flags column will  show	 which	extents	 are  preallo-

       -v     Shows  verbose  information.  When this flag is specified, addi-
	      tional AG	specific information is	appended to each line  in  the
	      following	form:

		   agno	(startagoffset..endagoffset) nblocks flags

	      A	second -v option will print out	the flags legend.

       -V     Prints the version number	and exits.

       xfs_fsr(8), xfs(5).



Want to link to this manual page? Use this URL:

home | help