ceph: Update max_len with minimum required size

encode_fh on error should update max_len with minimum required
size, so that caller can redo the call with the reallocated buffer.
This is required with open by handle patch series

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 387c5823944e..e38423e82f2e 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -62,13 +62,16 @@ static int ceph_encode_fh(struct dentry *dentry, u32 *rawfh, int *max_len,
                 *max_len = connected_handle_length;
                 type = 2;
         } else if (*max_len >= handle_length) {
-                if (connectable)
+                if (connectable) {
+                        *max_len = connected_handle_length;
                         return 255;
+                }
                 dout("encode_fh %p\n", dentry);
                 fh->ino = ceph_ino(dentry->d_inode);
                 *max_len = handle_length;
                 type = 1;
         } else {
+                *max_len = handle_length;
                 return 255;
         }
         return type;