Manual: filefrag

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	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.

       -x     Display mapping of extended attributes.

       -X     Display extent block numbers in hexadecimal format.

AUTHOR
       filefrag was written by Theodore Ts'o .

E2fsprogs version 1.47.2				January 2025						 FILEFRAG(8)