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FILEFRAG(8) System Manager's Manual FILEFRAG(8)
filefrag - report on file fragmentation
filefrag [ -bblocksize ] [ -BeksvxX ] [ files... ]
filefrag reports on how badly fragmented a particular file might be.
It makes allowances for indirect blocks for ext2 and ext3
filesystems, but can be used on files for any filesystem.
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.
-bblocksize
Use blocksize in bytes, or with [KMG] suffix, up to 1GB for
output instead of the filesystem blocksize. For compatibility
with earlier versions of filefrag, if blocksize is unspecified
it defaults to 1024 bytes.
-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.
-P Pre-load the ext4's extent status cache for the file. 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 '-b 1024').
-s Sync the file before requesting the mapping.
-v Be verbose when checking for file fragmentation.
-x Display mapping of extended attributes.
-X Display extent block numbers in hexadecimal format.
filefrag was written by Theodore Ts'o <tytso@mit.edu>.
This page is part of the e2fsprogs (utilities for ext2/3/4
filesystems) project. Information about the project can be found at
⟨http://e2fsprogs.sourceforge.net/⟩. It is not known how to report
bugs for this man page; if you know, please send a mail to
man-pages@man7.org. This page was obtained from the project's
upstream Git repository
⟨git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git⟩ on 2020-09-18.
(At that time, the date of the most recent commit that was found in
the repository was 2020-03-21.) If you discover any rendering prob‐
lems in this HTML version of the page, or you believe there is a bet‐
ter or more up-to-date source for the page, or you have corrections
or improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to man-pages@man7.org
E2fsprogs version 1.46-WIP March 2020 FILEFRAG(8)
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