FILEFRAG(8)		    System Manager's Manual		   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 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.

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

E2fsprogs version 1.47.3	   July 2025			   FILEFRAG(8)