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xfs_bmap(8)                 System Manager's Manual                xfs_bmap(8)

       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 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.

       If portions of the file have been migrated offline by a DMAPI  applica-
       tion, 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.