filefrag - report on file fragmentation

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

E2fsprogs version 1.47.2                          January 2025                                       FILEFRAG(8)

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

       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.

       filefrag - report on file fragmentation

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

       -bblocksize
              Use  blocksize  in  bytes,  or  with [KMG] suffix, up to 1GB for output instead of the file system
              blocksize.  For compatibility with earlier versions of filefrag, if blocksize  is  unspecified  it
              defaults  to  1024  bytes.   Since blocksize is an optional argument, it must be added without any
              space after -b.

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

       -E     Display the contents of ext4's extent status cache.  This feature is not supported on all kernels,
              and is only supported on ext4 file systems.

       -k     Use 1024-byte blocksize for output (identical to '-b1024').

       -P     Pre-load the ext4 extent status cache for the file.  This is not supported on all kernels, and  is
              only supported on ext4 file systems.

       -s     Sync the file before requesting the mapping.

       -v     Be verbose when checking for file fragmentation.

       -V     Print version number of program and library.  If given twice, also print the FIEMAP flags that are
              understood by the current version.

       -x     Display mapping of extended attributes.

       -X     Display extent block numbers in hexadecimal format.

filefrag [ -bblocksize ] [ -BeEkPsvVxX ] [ files...  ]