NFSv4: Follow a referral
Respond to a moved error on NFS lookup by setting up the referral.
Note: We don't actually follow the referral during lookup/getattr, but
later when we detect fsid mismatch in inode revalidation (similar to the
processing done for cloning submounts). Referrals will have fake attributes
until they are actually followed or traversed.
Signed-off-by: Manoj Naik <manoj@almaden.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index e426516..8ca44b7 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -58,7 +58,10 @@
if (err != 0)
goto out_err;
- mnt = nfs_do_submount(nd->mnt, nd->dentry, &fh, &fattr);
+ if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL)
+ mnt = nfs_do_refmount(nd->mnt, nd->dentry);
+ else
+ mnt = nfs_do_submount(nd->mnt, nd->dentry, &fh, &fattr);
err = PTR_ERR(mnt);
if (IS_ERR(mnt))
goto out_err;
@@ -94,6 +97,10 @@
.getattr = nfs_getattr,
};
+struct inode_operations nfs_referral_inode_operations = {
+ .follow_link = nfs_follow_mountpoint,
+};
+
static void nfs_expire_automounts(void *data)
{
struct list_head *list = (struct list_head *)data;