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 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.

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.  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.

       -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 (preallocated) extents that do not contain
              written  data.  With  the  -v  option,  the   flags   column   will   show   which   extents   are
              preallocated/unwritten.

       -v     Shows  verbose  information.  When  this  flag is specified, additional 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)