> I think you can. But I have never tried actually.
> Also you need to change the type of aufs_bindex_t, which is also defined
> in aufs_type.h, such like this.
>
> typedef short aufs_bindex_t;
I believe the max amount of branches shouldn't be such small.
I suggest at least 256.
> But I am afraid you may meet another problem.
> Since mount(2) and /proc/mounts has a limited space, too long mount
> options may cause an error.
This is probably my case.
> Currently I guess that your another bug report "bug on remount,ro" is
> related to mount(2) limit.
> Aufs should return an error in this case.
Well, I believe that aufs should be made so it can handle branches
differently, bypassing these limitations. Here is my suggestion. Would
you please consider branch manipulation through /proc? The /proc/mounts
would show only aufs is mounted somewhere and xino path and mount
options, but nothing more.
The rest would be in /proc/fs/aufs/{0-999x}/branches. If you cat this
file you'll get infos about branches. Moreover if you
echo add:1:/mnt/path > /proc/fs/aufs/0/branches
for example, then it would add the branch to the union 0. The same for
del, etc. Similarly, there could be /proc/fs/aufs/{0-999x}/info which
would contain some basic infos about the union, for example the mountpoint.
It is just a suggestion, I have no idea if this could even work, or if
there is a better way to do that. But I believe that aufs must bypass
the limitations of remount. It's pretty common to have 10 branches, with
250 characters-long paths each.
> Will you show me your /etc/mtab just before calling
> "mount -o remount,ro ."?
I'll show you, few hours later,
now I have to care about my little son :)
> And you didn't install /sbin/mount.aufs, did you?
No I didn't. I am using unionctl so maybe I should ... I will try it and
let you know.
Tomas M
slax.org
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