diff --git a/hgext/largefiles/lfutil.py b/hgext/largefiles/lfutil.py
--- a/hgext/largefiles/lfutil.py
+++ b/hgext/largefiles/lfutil.py
@@ -82,9 +82,10 @@ def inusercache(ui, hash):
     return path and os.path.exists(path)
 
 def findfile(repo, hash):
-    if instore(repo, hash):
+    path, exists = findstorepath(repo, hash)
+    if exists:
         repo.ui.note(_('found %s in store\n') % hash)
-        return storepath(repo, hash)
+        return path
     elif inusercache(repo.ui, hash):
         repo.ui.note(_('found %s in system cache\n') % hash)
         path = storepath(repo, hash)
@@ -164,10 +165,12 @@ def listlfiles(repo, rev=None, matcher=N
             for f in repo[rev].walk(matcher)
             if rev is not None or repo.dirstate[f] != '?']
 
-def instore(repo, hash):
-    return os.path.exists(storepath(repo, hash))
+def instore(repo, hash, forcelocal=False):
+    return os.path.exists(storepath(repo, hash, forcelocal))
 
-def storepath(repo, hash):
+def storepath(repo, hash, forcelocal=False):
+    if not forcelocal and repo.shared():
+        return repo.vfs.reljoin(repo.sharedpath, longname, hash)
     return repo.join(longname, hash)
 
 def findstorepath(repo, hash):
@@ -175,7 +178,17 @@ def findstorepath(repo, hash):
     hash.  If the file is not found, its path in the primary store is returned.
     The return value is a tuple of (path, exists(path)).
     '''
-    return (storepath(repo, hash), instore(repo, hash))
+    # For shared repos, the primary store is in the share source.  But for
+    # backward compatibility, force a lookup in the local store if it wasn't
+    # found in the share source.
+    path = storepath(repo, hash, False)
+
+    if instore(repo, hash):
+        return (path, True)
+    elif repo.shared() and instore(repo, hash, True):
+        return storepath(repo, hash, True)
+
+    return (path, False)
 
 def copyfromcache(repo, hash, filename):
     '''Copy the specified largefile from the repo or system cache to
diff --git a/tests/test-largefiles-cache.t b/tests/test-largefiles-cache.t
--- a/tests/test-largefiles-cache.t
+++ b/tests/test-largefiles-cache.t
@@ -153,3 +153,29 @@ for a forget.)
   ENOENT: * (glob)
   not removing z: file is already untracked
   [1]
+
+Largefiles are accessible from the share's store
+  $ cd ..
+  $ hg share -q src share_dst --config extensions.share=
+  $ hg -R share_dst update -r0
+  getting changed largefiles
+  1 largefiles updated, 0 removed
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ echo modified > share_dst/large
+  $ hg -R share_dst ci -m modified
+  created new head
+
+Only dirstate is in the local store for the share, and the largefile is in the
+share source's local store.  Avoid the extra largefiles added in the unix
+conditional above.
+  $ hash=`hg -R share_dst cat share_dst/.hglf/large`
+  $ echo $hash
+  e2fb5f2139d086ded2cb600d5a91a196e76bf020
+
+  $ find share_dst/.hg/largefiles/* | sort
+  share_dst/.hg/largefiles/dirstate
+
+  $ find src/.hg/largefiles/* | egrep "(dirstate|$hash)" | sort
+  src/.hg/largefiles/dirstate
+  src/.hg/largefiles/e2fb5f2139d086ded2cb600d5a91a196e76bf020