From 3ae251039c2781d13993f4aac24290d881821f12 Mon Sep 17 00:00:00 2001
From: Tom Clegg <tom@tomclegg.ca>
Date: Wed, 12 Feb 2020 11:39:18 -0500
Subject: [PATCH] 12308: Use RWMutex for filehandle map.

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@tomclegg.ca>
---
 lib/mount/fs.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/mount/fs.go b/lib/mount/fs.go
index 774948f574..c18c83d86b 100644
--- a/lib/mount/fs.go
+++ b/lib/mount/fs.go
@@ -36,7 +36,7 @@ type keepFS struct {
 	root   arvados.CustomFileSystem
 	open   map[uint64]*sharedFile
 	lastFH uint64
-	sync.Mutex
+	sync.RWMutex
 
 	// If non-nil, this channel will be closed by Init() to notify
 	// other goroutines that the mount is ready.
@@ -62,8 +62,8 @@ func (fs *keepFS) newFH(f arvados.File) uint64 {
 }
 
 func (fs *keepFS) lookupFH(fh uint64) *sharedFile {
-	fs.Lock()
-	defer fs.Unlock()
+	fs.RLock()
+	defer fs.RUnlock()
 	return fs.open[fh]
 }
 
-- 
2.30.2