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

# [NAME](#NAME)

filefrag - report on file fragmentation

# [SYNOPSIS](#SYNOPSIS)

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

# [DESCRIPTION](#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](#OPTIONS)

[**-B**](#B)

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

[**-bblocksize**](#b)

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**](#e)

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

[**-E**](#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**](#k)

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

[**-P**](#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**](#s)

Sync the file before requesting the mapping.

[**-v**](#v)

Be verbose when checking for file fragmentation.

[**-V**](#V)

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

[**-x**](#x)

Display mapping of extended attributes.

[**-X**](#X)

Display extent block numbers in hexadecimal format.

# [AUTHOR](#AUTHOR)

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

March 2025 E2fsprogs version 1.47.4

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Document: filefrag(8) from e2fsprogs 1.47.4-r2 (Chainguard OS)
Source: https://github.com/tytso/e2fsprogs