In order to connect disconnected dentries into the tree, we must be
able to determine their parent. Add a get_parent routine for NFS
which does a LOOKUPP operation (in the case of NFSv4), finds the
parent inode and then obtains the dentry for it.
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
---
fs/nfs/export.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/fs/nfs/export.c b/fs/nfs/export.c
index a40a9fc31d13..e1c8165652c5 100644
--- a/fs/nfs/export.c
+++ b/fs/nfs/export.c
@@ -119,8 +119,51 @@ out:
return ret ? ERR_PTR(ret) : dentry;
}
+static struct dentry *
+nfs_get_parent(struct dentry *dentry)
+{
+ int ret;
+ struct inode *inode = d_inode(dentry), *pinode;
+ struct super_block *sb = inode->i_sb;
+ struct nfs_server *server = NFS_SB(sb);
+ struct nfs_fattr *fattr = NULL;
+ struct nfs4_label *label = NULL;
+ struct dentry *parent;
+ struct nfs_rpc_ops const *ops = server->nfs_client->rpc_ops;
+ struct nfs_fh fh;
+
+ if (!ops->lookupp)
+ return ERR_PTR(-EACCES);
+
+ fattr = nfs_alloc_fattr();
+ if (fattr == NULL) {
+ parent = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ label = nfs4_label_alloc(server, GFP_KERNEL);
+ if (IS_ERR(label)) {
+ parent = ERR_CAST(label);
+ goto out;
+ }
+
+ ret = ops->lookupp(inode, &fh, fattr, label);
+ if (ret) {
+ parent = ERR_PTR(ret);
+ goto out;
+ }
+
+ pinode = nfs_fhget(sb, &fh, fattr, label);
+ parent = d_obtain_alias(pinode);
+out:
+ nfs4_label_free(label);
+ nfs_free_fattr(fattr);
+ return parent;
+}
+
const struct export_operations nfs_export_ops = {
.encode_fh = nfs_encode_fh,
.fh_to_dentry = nfs_fh_to_dentry,
+ .get_parent = nfs_get_parent,
.flags = EXPORT_OP_NOWCC|EXPORT_OP_NOSUBTREECHK|EXPORT_OP_CLOSE_BEFORE_UNLINK,
};
--
2.4.3
--
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