# xfs_bmap(8) - man - phpMan

[xfs_bmap(8)](https://www.chedong.com/phpMan.php/man/xfsbmap/8/markdown)                            System Manager's Manual                           [xfs_bmap(8)](https://www.chedong.com/phpMan.php/man/xfsbmap/8/markdown)



## 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 correspond‐
       ing 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
              instead of the default data fork.

### -e
              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

                   <_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
              If this option is given, **xfs**___**bmap** will display at most _num_extents_ extents. In the ab‐
              sence of **-n**, **xfs**___**bmap** will display all extents in the file.

### -p
              not contain written data. With the **-v** option, the _flags_ column will show which extents
              are preallocated/unwritten.

### -v
              mation 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

## SEE ALSO
       **xfs**___**[fsr**(8)](https://www.chedong.com/phpMan.php/man/fsr/8/markdown), [**xfs**(5)](https://www.chedong.com/phpMan.php/man/xfs/5/markdown).



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