Am Montag 08 März 2010 00:27:58 schrieb Jeff Garzik: > I'm curious, what is the overall deployment status of ext4 defragging? > I actually worked on this problem years ago[1], and am hopeful that I > will see defragging in a Linux distribution sometime in my lifetime! ;-) I had to make the following patch. (There was the same patch already on the e2fsprogs mailing list, but I cannot find that at the moment. Would be good if this patch can make it into the next version). --- a/misc/e4defrag.c +++ b/misc/e4defrag.c @@ -1605,7 +1605,7 @@ static int file_defrag(const char *file, const struct stat64 *buf, return 0; } - fd = open64(file, O_RDONLY); + fd = open64(file, O_RDWR); if (fd < 0) { if (mode_flag & DETAIL) { PRINT_FILE_NAME(file); I did use it on two machines and it does not seem to break anything. Some bigger things are missing in the e4defrag tool: - make the indirect to extend change for old files - e.g. converted ext3 file systems. Adding the MIGRATE ioctl does not look very hard, but who knows? - defragging directories (and also remove deleted entries) - free space optimization is only done as a side effect - overall layout considerations (e.g. putting files close to its directory or use the atime to move often used files to the beginning of a disk etc.) -- 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