kclient: fh_to_parent

diff --git a/src/kernel/export.c b/src/kernel/export.c
index 94ab31a82cef186706f4f9bc957cf7139338ecd0..28539d1522a09eb9824eb2890c07b2e4a06c78ff 100644 (file)
--- a/src/kernel/export.c
+++ b/src/kernel/export.c
@@ -70,7 +70,45 @@ struct dentry *ceph_fh_to_dentry(struct super_block *sb, struct fid *fid,
        return dentry;  
 }
 
+struct dentry *ceph_fh_to_parent(struct super_block *sb, struct fid *fid,
+                                int fh_len, int fh_type)
+{
+       u32 *fh = fid->raw;
+       u64 ino = *(u64 *)(fh + 3);
+       u32 gen;
+       struct inode *inode;
+       struct dentry *dentry;
+       
+       if (fh_len < 6)
+               return ERR_PTR(-ESTALE);
+
+       inode = ceph_get_inode(sb, ino);
+       if (!inode) {
+               dout(10, "fh_to_parent %llx.%d -- no inode\n", ino, gen);
+               return ERR_PTR(-ESTALE);
+       }
+       gen = fh[5];
+       if (inode->i_generation != gen) {
+               dout(10, "fh_to_parent %llx.%d -- %p bad gen %d\n", ino, gen,
+                    inode, inode->i_generation);
+               iput(inode);
+               return ERR_PTR(-ESTALE);
+       }
+       
+       dentry = d_alloc_anon(inode);
+       if (!dentry) {
+               dout(10, "fh_to_parent %llx.%d -- inode %p but ENOMEM\n", 
+                    ino, gen, inode);
+               iput(inode);
+               return ERR_PTR(-ENOMEM);
+       }
+       dout(10, "fh_to_parent %llx.%d -- inode %p dentry %p\n", ino, gen,
+            inode, dentry);
+       return dentry;  
+}
+
 const struct export_operations ceph_export_ops = {
        .encode_fh = ceph_encode_fh,
        .fh_to_dentry = ceph_fh_to_dentry,
+       .fh_to_parent = ceph_fh_to_parent,
 };