"Christoph Pleger":
> [ 193.1356342] aufs au_do_cpup_xattr:96:setupcon[987]: system.nfs4_acl,
> err -95
This message means that
- the internal copy-up happens.
- the file on the lower branch has an XATTR called "system.nfs4_acl".
- as a part of copy-up, aufs tries copying all XATTR from lower to
upper.
- but the upper branch doesn't support "system.nfs4_acl", and aufs gets
an error.
In other words, your lower nfs4 branch supports XATTR including its own
specific one, but obviously your upper tmpfs branch doesn't know such
XATTR at all.
Aufs has some branch attributes to address such case.
- read the manual, especially
.TP
.B icexsec | icexsys | icextr | icexusr | icexoth | icex
Ignore the error on copying\-up/down XATTR.
When an internal copy\-up/down happens, aufs tries copying all XATTRs.
Here an error can happen because of the XATTR support on the dst
branch may different from the src branch. If you know how the branch
supports or unsupports XATTR, you can specify these attributes.
`icexsec' means to ignore an error on copying\-up/down XATTR categorized
as "security" (for LSM and capability). And `icexsys,' `icextr,' and
`icexusr,' are for "system" (for posix ACL), "trusted" and "user"
categories individually.
`icexoth' is for any other category. To be convenient, `icex` sets them
all.
See also linux/Documentation/filesystems/aufs/design/06xattr.txt.
These attributes are essentially for the writable branches. But when you
use
.B
aufs_fhsm(5),
you may want to
specify them to the readonly branches too. So they are available for the
readonly branches.
- and specify "icexsys" attr to your upper rw branch, such like
# mount -t aufs -o br:/live/cow=rw+icexsys:/live/image none /your/aufs
For your case, there may exist some other workarounds such like
- specify 'noacl' to branches.
- re-configure and disable xattr.
- etc.
But I'd suggest you to try "icexsys" first, because it doesn't require
re-compiling.
J. R. Okajima
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