Re: OK, I give..Help?
"Chris Furlough": > What I'd like to be able to do, is to mount something over the whole "/" > mount point. Then you did it. And you see everything under /root/jukebox_cddb/aufs, except /proc, /sys, /dev/pts and /dev/shm, don't you? Is it enough for you? Junjiro Okajima - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
Re: mount.aufs and busybox
Wolfgang Barth: > Oops, I was wrong. The order of options from busybox mount is correct, but > the following test: > >test ! -r $f -o \( $do_update -eq 1 -a ! -w $f \) ... > > I'm using aufs during boot phase, so /etc/mtab did not exist. mount -n > won't update /etc/mtab, so why "test ! -r $f" ? I didn't know mount(8) can work even if /etc/mtab doesn't exist. I will modify mount.aufs but it may take some time since I am busy now. Until then, won't you create an empty /etc/mtab just before mount? Junjiro Okajima - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
Re: OK, I give..Help?
> Will you show me your /proc/mounts? rootfs / rootfs rw 0 0 udev /dev tmpfs rw 0 0 /dev/hda2 / reiserfs rw 0 0 proc /proc proc rw 0 0 sysfs /sys sysfs rw 0 0 debugfs /sys/kernel/debug debugfs rw 0 0 devpts /dev/pts devpts rw 0 0 tmpfs /dev/shm tmpfs rw 0 0 /dev/hda3 /root/jukebox_cddb reiserfs rw 0 0 none /root/jukebox_cddb/aufs aufs rw,xino=/root/jukebox_cddb/rw/.aufs.xino,br:/root/jukebox_cddb/rw=rw:/=ro 0 0 What I'd like to be able to do, is to mount something over the whole "/" mount point. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
Re: aufs max branches
Tomas M: > It was in Linux Live CD all the time, using 'mount' command from > busybox. Now I tried it in a normal Linux (installed) and it doesn't > segfault, remount simply exits with E2BIG (Argument list too long). Thi is the effect of the patch I sent. If you used the un-patched aufs, it would not return the error and cause a problem. > I noticed the line in /etc/mtab (mount arguments) can't be longer than > 4096 characters. This is 2^12 I guess. Yes, it is the limitation of mount and /proc/mounts. It is the size of a memory page. And aufs will try sysfs as you suggested. -- > Now I decided to skip unionctl at all, and use > >mount -n -o remount,add:1:/new/branch=ro aufs /union ::: > Remount segfaults the same in Live CD. BUT! I am unable to reproduce the > problem in my installed Linux, even if using busybox's mount. So it it > very strange :) Please let me make sure. - you did it on your hdd-installed Linux, instead of Live CD - the aufs patch was applied - mount.aufs was not installed - you executed busybox mount -n -o remount,add:1:/new/branch=ro aufs /union - the busybox aborted by segfault Which problem do you wrote as "unable to reproduce"? -- > So here is how did I fix it: > - I call: > > mount -o remount,ro aufs . Well, probably it is a busybox issue. But aufs should work correctly which includes the expected error. Do you think aufs has no problem anymore? I am confused a little... Junjiro Okajima - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
Re: mount.aufs and busybox
On Tue, Feb 13, 2007 at 10:55:23AM +0900, [EMAIL PROTECTED] wrote: > Wolfgang Barth: > > mount.aufs (20070205) won't work correctly with busybox - I'm using an old > > version 1.01. mount.aufs depends on the correct order of arguments, but the > > mount program from busybox seems not compatible with the standard linux > > one. > > > > Is there a plan to parse the options in a robust way instead of assuming > > the right order? > > Ok, I will try getopt. > Will you show me the actual arguments, by un-comment out "set -x" line > in mount.aufs? Oops, I was wrong. The order of options from busybox mount is correct, but the following test: test ! -r $f -o \( $do_update -eq 1 -a ! -w $f \) ... I'm using aufs during boot phase, so /etc/mtab did not exist. mount -n won't update /etc/mtab, so why "test ! -r $f" ? The output from mount.aufs as screen shot is attached as image. wob -- * http://www.swobspace.de mount.aufs.gif Description: GIF image - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
aufs remount - FIXED
So here is how did I fix it:
- I call:
mount -o remount,ro aufs .
instead of
mount -o remount,ro .
This fixes my issue. No more problems at all.
It's a busybox issue while calling mount(2) command IMHO!
I tried strace with the first command and it calls
mount("aufs", "/union", 0x807e6ec, \
MS_READONLY|MS_REMOUNT|MS_VERBOSE, "xino=...")
which causes segmentation fault. But when I call strace with the second
command, it calls
mount("aufs", "/union", 0, MS_READONLY|MS_REMOUNT|MS_VERBOSE, NULL )
As you can see, using the second way doesn't pass any arguments to the
mount command, but NULL.
NOTE: I tried with patched and unpatched opts.c, works in both cases.
So, I think the problem is fixed, at least for me.
Tomas M
slax.org
-
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Re: aufs max branches
So now I tried something even more different :) Before, I was calling unionctl to add branches one by one. Now I decided to skip unionctl at all, and use mount -n -o remount,add:1:/new/branch=ro aufs /union directly for all branches. Note -n switch to bypass the mtab at all. I removed mount.aufs as well. Remount segfaults the same in Live CD. BUT! I am unable to reproduce the problem in my installed Linux, even if using busybox's mount. So it it very strange :) The problem is only with liveCD. I noticed my busybox's mount ignores -n switch. I'll try to debug more and I'll post here. Tomas - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
Re: aufs max branches
Yes it's still the same, starts with BUG: ... NULL pointer ... even with the patched aufs loaded. It was in Linux Live CD all the time, using 'mount' command from busybox. Now I tried it in a normal Linux (installed) and it doesn't segfault, remount simply exits with E2BIG (Argument list too long). BUT! when I copy mount.aufs to /sbin then mount calls /sbin/mount.aufs. It works better now, I am able to add 113 branches to union. Then it fails with: [mntent]: line 9 in /etc/mtab is bad; rest of file ignored I noticed the line in /etc/mtab (mount arguments) can't be longer than 4096 characters. This is 2^12 I guess. Hope this helps a bit. Tomas [EMAIL PROTECTED] wrote: > Tomas M: >> I tested the patch. No difference, remount,ro causes oops in >> kernel/exit.c:860 > > How about "BUG: ... NULL pointer ..."? > Your gif file showed me it before "BUG: at kernel/exit.c:860". > > Junjiro Okajima > - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
Re: aufs max branches
Tomas M: > I tested the patch. No difference, remount,ro causes oops in > kernel/exit.c:860 How about "BUG: ... NULL pointer ..."? Your gif file showed me it before "BUG: at kernel/exit.c:860". Junjiro Okajima - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
Re: aufs max branches
I tested the patch. No difference, remount,ro causes oops in
kernel/exit.c:860
What should the patch do?
Thank you
Tomas M
> I think so.
> Will you try this patch?
>
> Junjiro Okajima
>
> Index: fs/aufs/opts.c
> ===
> RCS file: /cvsroot/aufs/aufs/fs/aufs/opts.c,v
> retrieving revision 1.24
> diff -u -p -r1.24 opts.c
> --- fs/aufs/opts.c12 Feb 2007 02:57:13 - 1.24
> +++ fs/aufs/opts.c13 Feb 2007 12:04:21 -
> @@ -633,9 +633,12 @@ int parse_opts(struct super_block *sb, c
> Err("unknown option %s\n", opt_str);
> break;
> }
> +
> if (!err && !skipped) {
> if (unlikely(++opt > opt_tail)) {
> err = -E2BIG;
> + opt--;
> + opt->type = Opt_tail;
> break;
> }
> opt->type = Opt_tail;
>
-
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Re: aufs max branches
Tomas M:
> and then I add branches one by one, by using
>
> mount -o remount,add:1:/mnt/images/image1 aufs /union
>
> for example. This works OK and branches are added to the union, but
> remounting the union ro causes the oops I sent you. Do you still agree
> it's a problem of the lenght of mount arguments?
I think so.
Will you try this patch?
Junjiro Okajima
Index: fs/aufs/opts.c
===
RCS file: /cvsroot/aufs/aufs/fs/aufs/opts.c,v
retrieving revision 1.24
diff -u -p -r1.24 opts.c
--- fs/aufs/opts.c 12 Feb 2007 02:57:13 - 1.24
+++ fs/aufs/opts.c 13 Feb 2007 12:04:21 -
@@ -633,9 +633,12 @@ int parse_opts(struct super_block *sb, c
Err("unknown option %s\n", opt_str);
break;
}
+
if (!err && !skipped) {
if (unlikely(++opt > opt_tail)) {
err = -E2BIG;
+ opt--;
+ opt->type = Opt_tail;
break;
}
opt->type = Opt_tail;
-
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Re: aufs max branches
> Then, I will try sysfs instead of /proc. > Give me some time. > > But I don't think it is good to implement >> echo add:1:/mnt/path > /proc/fs/aufs/0/branches > > The (re)mount interface is better. Thank you very much for your consideration! I like the (re)mount very much, but will your modification fix the problem I reported? (the kernel oops or whatever it was in kernel/exit.c) To make things more clear, I don't call 'mount' command with a huge list of branches to mount the union, but instead I create the union in /union mount -t aufs -o br:/memory=rw aufs /union and then I add branches one by one, by using mount -o remount,add:1:/mnt/images/image1 aufs /union for example. This works OK and branches are added to the union, but remounting the union ro causes the oops I sent you. Do you still agree it's a problem of the lenght of mount arguments? Tomas M slax.org - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
Re: mount.aufs and busybox
>> mount.aufs (20070205) won't work correctly with busybox - I'm using an old >> version 1.01. What about compiling a new version of busybox? :) I use busybox for a long time and it's better and better with all new releases. Tomas M - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
