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xfs_bmap(1M)							  xfs_bmap(1M)

NAME    [Toc]    [Back]

     xfs_bmap -	print block mapping for	an XFS file

SYNOPSIS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     fcntl(F_GETBMAPX) filename: Invalid argument
	       The file	filename is not	in an XFS filesystem.

									Page 1

xfs_bmap(1M)							  xfs_bmap(1M)

SEE ALSO    [Toc]    [Back]

     fcntl(2), lv(7M), xlv(7M).

									PPPPaaaaggggeeee 2222
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