Thomas, I was able to reproduce your problem (which is also bug #624) and I
have a fix which worked for my test cases. Can you try the following patch
and let me know:
https://bugzilla.fsl.cs.sunysb.edu/attachment.cgi?id=233
I also included the patch below. This was for 2.6.29, but should apply to
other kernels as well.
Thanks,
Erez.
##############################################################################
Unionfs: fix readonly nfs2/3 permission handling
In unionfs_permission: NFSv2/3 return EACCES on readonly-exported, locally
readonly-mounted file systems, instead of EROFS like other file systems do.
So we have no choice here but to intercept this and ignore it for NFS
branches marked readonly.
Signed-off-by: Erez Zadok <e...@cs.sunysb.edu>
diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 7c17093..bbb44d0 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -843,6 +843,19 @@ static int unionfs_permission(struct inode *inode, int
mask)
}
/*
+ * NFS HACK: NFSv2/3 return EACCES on readonly-exported,
+ * locally readonly-mounted file systems, instead of EROFS
+ * like other file systems do. So we have no choice here
+ * but to intercept this and ignore it for NFS branches
+ * marked readonly.
+ */
+ if (err && err == -EACCES &&
+ is_robranch_super(inode->i_sb, bindex) &&
+ lower_inode->i_sb->s_magic == NFS_SUPER_MAGIC)
+ err = 0;
+
+
+ /*
* The permissions are an intersection of the overall directory
* permissions, so we fail if one fails.
*/
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