diff --git a/mercurial/store.py b/mercurial/store.py
--- a/mercurial/store.py
+++ b/mercurial/store.py
@@ -520,9 +520,17 @@ class StoreFile:
     """a file matching an entry"""
 
     unencoded_path = attr.ib()
-    file_size = attr.ib()
+    _file_size = attr.ib(default=False)
     is_volatile = attr.ib(default=False)
 
+    def file_size(self, vfs):
+        if self._file_size is not None:
+            return self._file_size
+        try:
+            return vfs.stat(self.unencoded_path).st_size
+        except FileNotFoundError:
+            return 0
+
 
 class basicstore:
     '''base class for local repository stores'''
@@ -900,16 +908,12 @@ class fncachestore(basicstore):
                 # However the fncache might contains such file added by
                 # previous version of Mercurial.
                 continue
-            try:
-                yield RevlogStoreEntry(
-                    unencoded_path=f,
-                    revlog_type=FILEFLAGS_FILELOG,
-                    is_revlog_main=bool(t & FILEFLAGS_REVLOG_MAIN),
-                    is_volatile=bool(t & FILEFLAGS_VOLATILE),
-                    file_size=self.getsize(ef),
-                )
-            except FileNotFoundError:
-                pass
+            yield RevlogStoreEntry(
+                unencoded_path=f,
+                revlog_type=FILEFLAGS_FILELOG,
+                is_revlog_main=bool(t & FILEFLAGS_REVLOG_MAIN),
+                is_volatile=bool(t & FILEFLAGS_VOLATILE),
+            )
 
     def copylist(self):
         d = (
diff --git a/mercurial/streamclone.py b/mercurial/streamclone.py
--- a/mercurial/streamclone.py
+++ b/mercurial/streamclone.py
@@ -271,9 +271,10 @@ def generatev1(repo):
         repo.ui.debug(b'scanning\n')
         for entry in _walkstreamfiles(repo):
             for f in entry.files():
-                if f.file_size:
-                    entries.append((f.unencoded_path, f.file_size))
-                    total_bytes += f.file_size
+                file_size = f.file_size(repo.store.vfs)
+                if file_size:
+                    entries.append((f.unencoded_path, file_size))
+                    total_bytes += file_size
         _test_sync_point_walk_1(repo)
     _test_sync_point_walk_2(repo)
 
@@ -680,12 +681,13 @@ def _v2_walk(repo, includes, excludes, i
 
     for entry in _walkstreamfiles(repo, matcher):
         for f in entry.files():
-            if f.file_size:
+            file_size = f.file_size(repo.store.vfs)
+            if file_size:
                 ft = _fileappend
                 if f.is_volatile:
                     ft = _filefull
-                entries.append((_srcstore, f.unencoded_path, ft, f.file_size))
-                totalfilesize += f.file_size
+                entries.append((_srcstore, f.unencoded_path, ft, file_size))
+                totalfilesize += file_size
     for name in _walkstreamfullstorefiles(repo):
         if repo.svfs.exists(name):
             totalfilesize += repo.svfs.lstat(name).st_size
diff --git a/mercurial/verify.py b/mercurial/verify.py
--- a/mercurial/verify.py
+++ b/mercurial/verify.py
@@ -410,7 +410,7 @@ class verifier:
             for entry in repo.store.datafiles(undecodable=undecodable):
                 for file_ in entry.files():
                     f = file_.unencoded_path
-                    size = file_.file_size
+                    size = file_.file_size(repo.store.vfs)
                     if (size > 0 or not revlogv1) and f.startswith(b'meta/'):
                         storefiles.add(_normpath(f))
                         subdirs.add(os.path.dirname(f))
@@ -477,7 +477,7 @@ class verifier:
         undecodable = []
         for entry in repo.store.datafiles(undecodable=undecodable):
             for file_ in entry.files():
-                size = file_.file_size
+                size = file_.file_size(repo.store.vfs)
                 f = file_.unencoded_path
                 if (size > 0 or not revlogv1) and f.startswith(b'data/'):
                     storefiles.add(_normpath(f))