FILEFRAG(8)               (August 2021)               FILEFRAG(8)

     NAME
          filefrag - report on file fragmentation

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

     DESCRIPTION
          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.

     OPTIONS
          -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 sup-
               ported 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.

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     FILEFRAG(8)               (August 2021)               FILEFRAG(8)

          -x   Display mapping of extended attributes.

          -X   Display extent block numbers in hexadecimal format.

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

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