ext4: online defrag -- Ext4 online defrag command manpage From: Akira Fujita <a-fujita@xxxxxxxxxxxxx> Following is e4defrag command manpage. Please use `nroff -man e4defrag.8 | less` to view. Signed-off-by: Kazuya Mio <k-mio@xxxxxxxxxxxxx> Signed-off-by: Akira Fujita <a-fujita@xxxxxxxxxxxxx> --- .TH E4DEFRAG 8 "May 2009" "e4defrag version 2.0" .SH NAME e4defrag \- online defragmenter for ext4 filesystem .SH SYNOPSIS .B e4defrag [ .B \-c ] [ .B \-v ] .I target \&... .SH DESCRIPTION .B e4defrag reduces fragmentation of extent based file. The file targeted by .B e4defrag is created on ext4 filesystem made with "-O extent" option (see .BR mke2fs (8)). The targeted file gets more contiguous blocks and improves the file access speed. .PP .I target is a regular file, a directory, or a device that is mounted as ext4 filesystem. If .I target is a directory, .B e4defrag reduces fragmentation of all files in it. If .I target is a device, .B e4defrag gets the mount point of it and reduces fragmentation of all files in this mount point. .SH OPTIONS .TP .B \-c Get the fragmentation count and calculate fragmentation score based on it before and after defrag. By seeing this score, we can determine whether we should execute .B e4defrag to .IR target . When used with .B \-v option, the fragmentation count before and after defrag is printed for each file. .IP If this option is specified, .I target is never defragmented. .TP .B \-v Print error messages and the fragmentation count before and after defrag for each file. .SH NOTES .B e4defrag does not support swap file, files in lost+found directory, and files allocated in indirect blocks. When .I target is a device or a mount point, .B e4defrag doesn't defragment files in mount point of other device. .PP Non-privileged users can execute .B e4defrag to their own file, but the score is not printed if .B \-c option is specified. Therefore, it is desirable to be executed by root user. .SH AUTHOR Written by Akira Fujita <a-fujita@xxxxxxxxxxxxx> and Takashi Sato <t-sato@xxxxxxxxxxxxx>. .SH SEE ALSO .BR mke2fs (8), .BR mount (8). -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
