mirror of https://github.com/vitalif/e2fsprogs
77 lines
1.8 KiB
Groff
77 lines
1.8 KiB
Groff
.TH E4DEFRAG 8 "May 2009" "e4defrag version 2.0"
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.SH NAME
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e4defrag \- online defragmenter for ext4 filesystem
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.SH SYNOPSIS
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.B e4defrag
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[
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.B \-c
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]
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[
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.B \-v
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]
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.I target
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\&...
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.SH DESCRIPTION
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.B e4defrag
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reduces fragmentation of extent based file. The file targeted by
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.B e4defrag
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is created on ext4 filesystem made with "-O extent" option (see
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.BR mke2fs (8)).
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The targeted file gets more contiguous blocks and improves the file access
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speed.
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.PP
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.I target
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is a regular file, a directory, or a device that is mounted as ext4 filesystem.
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If
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.I target
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is a directory,
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.B e4defrag
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reduces fragmentation of all files in it. If
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.I target
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is a device,
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.B e4defrag
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gets the mount point of it and reduces fragmentation of all files in this mount
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point.
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.SH OPTIONS
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.TP
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.B \-c
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Get the fragmentation count and calculate fragmentation score based on it
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before and after defrag. By seeing this score, we can determine whether we
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should execute
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.B e4defrag
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to
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.IR target .
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When used with
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.B \-v
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option, the fragmentation count before and after defrag is printed for each
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file.
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.IP
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If this option is specified,
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.I target
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is never defragmented.
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.TP
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.B \-v
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Print error messages and the fragmentation count before and after defrag for
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each file.
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.SH NOTES
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.B e4defrag
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does not support swap file, files in lost+found directory, and files allocated
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in indirect blocks. When
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.I target
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is a device or a mount point,
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.B e4defrag
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doesn't defragment files in mount point of other device.
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.PP
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Non-privileged users can execute
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.B e4defrag
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to their own file, but the score is not printed if
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.B \-c
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option is specified. Therefore, it is desirable to be executed by root user.
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.SH AUTHOR
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Written by Akira Fujita <a-fujita@rs.jp.nec.com> and Takashi Sato
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<t-sato@yk.jp.nec.com>.
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.SH SEE ALSO
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.BR mke2fs (8),
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.BR mount (8).
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