Okajima,
Thanks for looking into this.
If there is a chance of this warning coming even after using udba=notify, I
am not inclined to mounting with that option and taking the performance hit.
Meanwhile I'll try to see if I can print (in the warning) full path of file
or directory UDBA that is causing is. This way I can make the userspace
touch that file or dir through the aufs mount and not underlying branch
directly.
Prasad
On Sun, Feb 10, 2013 at 9:37 PM, <[1]sf...@users.sourceforge.net> wrote:
Hello Prasad,
Prasad Koya:
> Looking at aufs3.x sources, I see the same behavior ie., that if code ever
> hits below condition it evaluates to true (if CRAMFS is not configured). I
> can try enabling CONFIG_AUFS_HNOTIFY option but is there is anyway I could
> verify that enabling this config and using mount option "fixes" this
issue.
Sorry for my slow response.
If I remember correctly, even if you set udba=notify, there are a few
cases left the warning produced.
(from the aufs manual)
----------------------------------------
To rename/rmdir a directory on a branch directory may reveal the same
named
directory on the lower branch. Aufs tries re-lookuping the renamed
directory and the revealed directory and assigning different inode
number to them. But the inode number including their children can be a
problem. The inode numbers will be changed silently, and
aufs may produce a warning. If you rename a directory repeatedly and
reveal/hide the lower directory, then aufs may confuse their inode
numbers too. It depends upon the system cache.
When you make a directory in aufs and mount other filesystem on it,
the directory in aufs cannot be removed expectedly because it is a
mount point. But the same named directory on the writable branch can
be removed, if someone wants. It is just an empty directory, instead
of a mount point.
Aufs cannot stop such direct rmdir, but produces a warning about it.
----------------------------------------
I will develop a script to reproduce the warning, bu I am not sure when
it succeeds.
J. R. Okajima
References
1. mailto:sf...@users.sourceforge.net
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