xfs_bmap(1M)

NAME
     xfs_bmap - print block mapping for an XFS file

SYNOPSIS
     xfs_bmap [ -a ] [ -l ] [ -d ] [ -n nnn ] [ -v ] 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.

     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.

     If the -v option is given, the XFS allocation group and allocation group
     offsets are displayed for each extent.  If the allocation is on a striped
     device, a flag is also displayed indicating if the extent does not fall
     on a stripe boundry.

DIAGNOSTICS
     fcntl(F_GETBMAPX) filename: Invalid argument
               The file filename is not in an XFS filesystem.
SEE ALSO
     fcntl(2), lv(7M), xlv(7M).