Hi, On Mon, Oct 26, 2009 at 04:07:58PM +0200, Riku Voipio wrote: > Hi Osamu, > > On Mon, Oct 26, 2009 at 09:25:36PM +0900, Osamu Aoki wrote: > > I realized that mkfs.ext2 creates different superblock depending on which > > system it is run under. The difference can be observed by tune2fs -l: > > > > ext2 created by Debian lenny on amd64: > > Filesystem flags: signed_directory_hash > > > > ext2 created by Ubuntu 09.4 armel: > > Filesystem flags: unsigned_directory_hash > > > > It seems it comes from the fact that armel uses unsigned for char.
I should have put some reference why I said it. This was because of Ted's patch. > Ted, can you check if e2fsprogs expects signed char in the code that > checks for signed directory hash? I can see http://patchwork.kernel.org/patch/22568/ (2009-05-08 11:58:01) has: From: Theodore Ts'o <[email protected]> The original ext3 hash algorithms assumed that variables of type char were signed, as God and K&R intended. Unfortunately, this assumption is not true on some architectures. Userspace support for marking filesystems with non-native signed/unsigned chars was added two years ago, but the kernel-side support was never added (until now). Signed-off-by: "Theodore Ts'o" <[email protected]> Cc: [email protected] Cc: [email protected] ... > > Since kernel support of this flag is new and lenny or jaunty one seems > > to ignore it, I could move file between these 2 system. (I do fsck -p > > to get hash fixed every time I move, first.) So it works now but this > > is sloppy. > > > > What is the right tool to change this "Filesystem flags" setting. I do > > not see in lenny or jaunty. Can new tune2fs adjust this parameter? > > What is the right way to move ext2 filesystem between system? > > Rather, lets try to get it fixed instead. There should be no reason > to run tune2fs when moving a filesystem from armel to x86 machine. With newer patched kernels after 2009-05-08 11:58:01, I expect this is handled well. But now we do fsck in one environment without changing this signed/unsigned flag. By doind so will make filesystem to be fsck clean but not matching signed/unsigned flag. This is why I asked how you have been dealing this situation as porters. > > PS: I am playing with Sharp PC-Z1. > > http://wiki.debian.org/InstallingDebianOn/Sharp/PC-Z1NetWalker > > Seems like a very interesting device :) Yes. It is my toy. Since this is almost like PC with USB and microSD card, I am tempted to format them in ext2. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
