exportfs: Return the minimum required handle size

The exportfs encode handle function should return the minimum required
handle size. This helps user to find out the handle size by passing 0
handle size in the first step and then redoing to the call again with
the returned handle size value.

Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 0bae036831e2..1bba24bad820 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -1593,8 +1593,13 @@ int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
         struct inode *inode = dentry->d_inode;
         int maxlen = *lenp;
 
-        if (maxlen < 3)
+        if (need_parent && (maxlen < 5)) {
+                *lenp = 5;
                 return 255;
+        } else if (maxlen < 3) {
+                *lenp = 3;
+                return 255;
+        }
 
         data[0] = inode->i_ino;
         data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);