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

       filefrag - report on file fragmentation

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

       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.

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

              Use blocksize in bytes, or with [KMG] suffix, up to 1GB for output instead of the file system blocksize.  For compat‐
              ibility 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 sup‐
              ported 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 was written by Theodore Ts'o <>.

E2fsprogs version 1.47.0                                   February 2023                                                FILEFRAG(8)