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, 2 deletions

diff --git a/fs/gfs2/export.c b/fs/gfs2/export.c
index 9023db8184f9..b5a5e60df0d5 100644
--- a/fs/gfs2/export.c
+++ b/fs/gfs2/export.c
@@ -36,9 +36,13 @@ static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
         struct super_block *sb = inode->i_sb;
         struct gfs2_inode *ip = GFS2_I(inode);
 
-        if (*len < GFS2_SMALL_FH_SIZE ||
-            (connectable && *len < GFS2_LARGE_FH_SIZE))
+        if (connectable && (*len < GFS2_LARGE_FH_SIZE)) {
+                *len = GFS2_LARGE_FH_SIZE;
                 return 255;
+        } else if (*len < GFS2_SMALL_FH_SIZE) {
+                *len = GFS2_SMALL_FH_SIZE;
+                return 255;
+        }
 
         fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
         fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);