Provided by: xfsprogs_2.7.7-1_i386 bug


       xfs_bmap - print block mapping for an XFS file


       xfs_bmap [ -a ] [ -l ] [ -d ] [ -n nnn ] file ...


       xfs_bmap  prints  the  map  of  disk  blocks  used  by  files in an XFS
       filesystem.  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.

       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.  However  if
       the  -d  option  is  used,  no DMAPI read event will be generated for a
       DMAPI file and offline portions will be reported as holes.

       If the -l 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.

       If  the -a option is given, information about the file’s attribute fork
       is printed instead of the default data fork.

       If the -n nnn option is given, xfs_bmap obtains the extent list of  the
       file  in groups of nnn 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.