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Subjectnfsfh.c:nfsd_findparent lookup("..") failure fix in 2.4.4 - xfs related?
The following diff was made in 2.4.4.

diff -u --recursive --new-file v2.4.4/linux/fs/nfsd/nfsfh.c linux/fs/nfsd/nfsfh.c
--- v2.4.4/linux/fs/nfsd/nfsfh.c Fri Feb 9 11:29:44 2001
+++ linux/fs/nfsd/nfsfh.c Sat May 19 17:47:55 2001
@@ -244,6 +245,11 @@
*/
pdentry = child->d_inode->i_op->lookup(child->d_inode, tdentry);
d_drop(tdentry); /* we never want ".." hashed */
+ if (!pdentry && tdentry->d_inode == NULL) {
+ /* File system cannot find ".." ... sad but possible */
+ dput(tdentry);
+ pdentry = ERR_PTR(-EINVAL);
+ }


Umh. How is it possible to have a valid dentry which has no parent?
Even "/.." is linked to "/."

Is this xfs related? At least it was triggered on 2.4.3-xfs with
exported xfs filesystems.
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