Provided by: xfsprogs_6.8.0-2.2ubuntu1.1_amd64 
NAME
xfs_bmap - print block mapping for an XFS file
SYNOPSIS
xfs_bmap [ -adelpv ] [ -n num_extents ] file
xfs_bmap -V
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.
-e If this option is used, xfs_bmap obtains all delayed allocation extents, and does not flush dirty
pages to disk before querying extent data. With the -v option, the flags column will show which
extents have not yet been allocated.
-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 will display at most num_extents extents. In the absence of -n,
xfs_bmap will display all extents in the file.
-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.
-V Prints the version number and exits.
SEE ALSO
xfs_fsr(8), xfs(5). xfs_bmap(8)