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xfs_bmap(8)							   xfs_bmap(8)

NAME
       xfs_bmap - print block mapping for an XFS file

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

DESCRIPTION
       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.

OPTIONS
       -a     If this  option  is  specified,  information  about  the	file's
	      attribute 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
	      holes.

       -l     If this option is used, then

		   <nblocks>  blocks

	      will be appended to each line.  nblocks is  the  length  of  the
	      extent 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
	      option, the flags column will show which	extents	 are  preallo‐
	      cated/unwritten.

       -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.

SEE ALSO
       xfs_fsr(8), xfs(5).

								   xfs_bmap(8)

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