From 546a709f202024c8a5173ad372a87ddc1c284c63 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 29 Aug 2019 15:04:49 +0200
Subject: [PATCH] daemon: Don't reply on 'st_blocks'.
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Ported by Ludovic Courtès <ludo@gnu.org>
from <https://github.com/NixOS/nix/commit/a2c4fcd5e9782dc8d2998773380c7171ee53b813>.

* nix/libstore/gc.cc (LocalStore::removeUnusedLinks): Use 'st.st_size'
instead of 'st.st_blocks * 512'.
* nix/libutil/util.cc (_deletePath): Likewise.
---
 nix/libstore/gc.cc  | 9 ++++-----
 nix/libutil/util.cc | 2 +-
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/nix/libstore/gc.cc b/nix/libstore/gc.cc
index 310b8792fe..46171e116c 100644
--- a/nix/libstore/gc.cc
+++ b/nix/libstore/gc.cc
@@ -569,9 +569,8 @@ void LocalStore::removeUnusedLinks(const GCState & state)
             throw SysError(format("statting `%1%'") % path);
 
         if (st.st_nlink != 1) {
-            unsigned long long size = st.st_blocks * 512ULL;
-            actualSize += size;
-            unsharedSize += (st.st_nlink - 1) * size;
+            actualSize += st.st_size;
+            unsharedSize += (st.st_nlink - 1) * st.st_size;
             continue;
         }
 
@@ -580,13 +579,13 @@ void LocalStore::removeUnusedLinks(const GCState & state)
         if (unlink(path.c_str()) == -1)
             throw SysError(format("deleting `%1%'") % path);
 
-        state.results.bytesFreed += st.st_blocks * 512;
+        state.results.bytesFreed += st.st_size;
     }
 
     struct stat st;
     if (stat(linksDir.c_str(), &st) == -1)
         throw SysError(format("statting `%1%'") % linksDir);
-    long long overhead = st.st_blocks * 512ULL;
+    long long overhead = st.st_size;
 
     printMsg(lvlInfo, format("note: currently hard linking saves %.2f MiB")
         % ((unsharedSize - actualSize - overhead) / (1024.0 * 1024.0)));
diff --git a/nix/libutil/util.cc b/nix/libutil/util.cc
index 768e12b5e4..9a83876013 100644
--- a/nix/libutil/util.cc
+++ b/nix/libutil/util.cc
@@ -309,7 +309,7 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
     struct stat st = lstat(path);
 
     if (!S_ISDIR(st.st_mode) && st.st_nlink == 1)
-        bytesFreed += st.st_blocks * 512;
+	bytesFreed += st.st_size;
 
     if (S_ISDIR(st.st_mode)) {
         /* Make the directory writable. */