Thanatermesis:
> The message that are showed most times is:
> 
> aufs au_append_plink:264:dpkg[10011]: unexpectedly many pseudo links, 2917

Basically this is a harmless message which I inserted to know how many
pseudo-links will be used. When the number is larger than
AUFS_PLINK_WARN which is defined in include/linux/aufs_type.h, this
warning is produced.
Since this large number can be a memory pressure. So I'd recommend you
to flush the aufs pseudo-links by remount or auplink script. The easiest
way is,
- install all aufs scripts to /sbin (as described in README)
- sudo mount -o remount,noplink,plink /your/aufs

If you don't want to see this message, try changing AUFS_PLINK_WARN or
hiding kern.warn syslog.


> aufs au_copy_file:226:dpkg[10011]: copying a large file 6801323

This is an informational message too. When the copying-up file is larger
than 4GB and CONFIG_AUFS_DEBUG is enabled, aufs produces this message
with kern.warn.


> aufs may_rename_srcdir:409:thunar[14455]: renaming dir who has child(ren) on
> multiple branches, is not supported

This is a feature of aufs. See below in detail.
The message is produced once in 256 times when aufs detects such case.

(from the aufs manual)
----------------------------------------------------------------------
To rename(2) directory may return EXDEV even if both of src and tgt
are on the same aufs. When the rename-src dir exists on multiple
branches and the lower dir has child(ren), aufs has to copyup all his
children. It can be recursive copyup. Current aufs does not support
such huge copyup operation at one time in kernel space, instead
produces a warning and returns EXDEV.
Generally, mv(1) detects this error and tries mkdir(2) and rename(2)
repeatedly. So the result is harmless.
If your application which issues rename(2) for a directory does not
support EXDEV, it will not work on aufs.
----------------------------------------------------------------------


Junjiro Okajima

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