From bc7b0cbe156da639f0cbe17bf89725d87e86512a Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Sun, 16 Nov 2008 13:25:10 +0000
Subject: [PATCH] Open file and loop device with O_RDONLY when -o loop,ro.
 Otherwise: ioctl LOOP_SET_FD failed: Bad file number.

---
 toolbox/mount.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/toolbox/mount.c b/toolbox/mount.c
index ef13e1fd5..395c9433a 100644
--- a/toolbox/mount.c
+++ b/toolbox/mount.c
@@ -138,14 +138,17 @@ do_mount(char *dev, char *dir, char *type, unsigned long rwflag, void *data, int
 
     if (loop) {
         int file_fd, device_fd;
+        int flags;
+
+        flags = (rwflag & MS_RDONLY) ? O_RDONLY : O_RDWR;
         
         // FIXME - only one loop mount supported at a time
-        file_fd = open(dev, O_RDWR);
+        file_fd = open(dev, flags);
         if (file_fd < -1) {
             perror("open backing file failed");
             return 1;
         }
-        device_fd = open(LOOP_DEVICE, O_RDWR);
+        device_fd = open(LOOP_DEVICE, flags);
         if (device_fd < -1) {
             perror("open loop device failed");
             close(file_fd);