FILEFRAG(8)                          System Manager's Manual                          FILEFRAG(8)



NAME
       filefrag - report on file fragmentation

SYNOPSIS
       filefrag [ -bblocksize ] [ -BeksvxX ] [ files...  ]

DESCRIPTION
       filefrag  reports on how badly fragmented a particular file might be.  It makes allowances
       for indirect blocks for ext2 and ext3 filesystems, but  can  be  used  on  files  for  any
       filesystem.

       The  filefrag  program initially attempts to get the extent information using FIEMAP ioctl
       which is more efficient and faster.  If FIEMAP is not supported then  filefrag  will  fall
       back to using FIBMAP.

OPTIONS
       -B     Force  the  use  of  the older FIBMAP ioctl instead of the FIEMAP ioctl for testing
              purposes.

       -bblocksize
              Use blocksize in bytes for output instead of the filesystem blocksize.  For compat‐
              ibility  with earlier versions of filefrag, if blocksize is unspecified it defaults
              to 1024 bytes.

       -e     Print output in extent format, even for block-mapped files.

       -k     Use 1024-byte blocksize for output (identical to '-b 1024').

       -s     Sync the file before requesting the mapping.

       -v     Be verbose when checking for file fragmentation.

       -x     Display mapping of extended attributes.

       -X     Display extent block numbers in hexadecimal format.

AUTHOR
       filefrag was written by Theodore Ts'o <tytso AT mit.edu>.



E2fsprogs version 1.42.12                  August 2014                                FILEFRAG(8)