[PATCH 004 of 18] knfsd: nfsd: make exp_rootfh handle exp_parent errors

[NeilBrown]

From: J.Bruce Fields <bfields@xxxxxxxxxxxx>

Since exp_parent can fail by returning an error (-EAGAIN) in addition 
to by returning NULL, we should check for that case in exp_rootfh.

(TODO: we should check that userland handles these errors too.)

Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
Signed-off-by: Neil Brown <neilb@xxxxxxx>

### Diffstat output
 ./fs/nfsd/export.c |    4 ++++
 1 file changed, 4 insertions(+)

diff .prev/fs/nfsd/export.c ./fs/nfsd/export.c
--- .prev/fs/nfsd/export.c	2006-12-08 12:07:28.000000000 +1100
+++ ./fs/nfsd/export.c	2006-12-08 12:08:20.000000000 +1100
@@ -1104,6 +1104,10 @@ exp_rootfh(svc_client *clp, char *path, 
 		 path, nd.dentry, clp->name,
 		 inode->i_sb->s_id, inode->i_ino);
 	exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
+	if (IS_ERR(exp)) {
+		err = PTR_ERR(exp);
+		goto out;
+	}
 	if (!exp) {
 		dprintk("nfsd: exp_rootfh export not found.\n");
 		goto out;
-
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