From 00746b32c0c28bd8f0dbb114b380fb10f6121d54 Mon Sep 17 00:00:00 2001
From: Louis Dureuil <louis@meilisearch.com>
Date: Tue, 10 Jan 2023 09:46:28 +0100
Subject: [PATCH] Add Index::map_size

---
 milli/src/index.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/milli/src/index.rs b/milli/src/index.rs
index 50a4e909f..46f8eb6a3 100644
--- a/milli/src/index.rs
+++ b/milli/src/index.rs
@@ -255,6 +255,16 @@ impl Index {
         Ok(self.env.real_disk_size()?)
     }
 
+    /// Returns the map size the underlying environment was opened with, in bytes.
+    ///
+    /// This value does not represent the current on-disk size of the index.
+    ///
+    /// This value is the maximum between the map size passed during the opening of the index
+    /// and the on-disk size of the index at the time of opening.
+    pub fn map_size(&self) -> Result<usize> {
+        Ok(self.env.map_size()?)
+    }
+
     pub fn copy_to_path<P: AsRef<Path>>(&self, path: P, option: CompactionOption) -> Result<File> {
         self.env.copy_to_path(path, option).map_err(Into::into)
     }