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, 3 insertions, 1 deletions

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 86753fe10bd1..0e277ec4b612 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -757,8 +757,10 @@ fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable)
         struct inode *inode =  de->d_inode;
         u32 ipos_h, ipos_m, ipos_l;
 
-        if (len < 5)
+        if (len < 5) {
+                *lenp = 5;
                 return 255; /* no room */
+        }
 
         ipos_h = MSDOS_I(inode)->i_pos >> 8;
         ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24;