ANDROID: fs: Fix for in kernel emergency remount when loop mounts are used

adb reboot calls /proc/sysrq-trigger to force an emergency remount (ro) of all
mounted disks. This is executed in the order of the time the mount was originally
done. Because we have a test system which loop mount images from an extra
partition, we see errors cause the loop mounted partitions gets remounted after
this physical partition was set to read only already.

Fix this by reversing the order of the emergency remount. This will remount the
disk first which have been mounted last.

So instead of remounting in this order:
 /dev/sda1
 /dev/loop1
 /dev/loop2
we now remount in this order:
 /dev/loop2
 /dev/loop1
 /dev/sda1

Change-Id: I68fe7e16cc9400ab5278877af70c9ea1d9b57936
Signed-off-by: Christian Poetzsch <christian.potzsch@imgtec.com>

diff --git a/fs/super.c b/fs/super.c
index 994db21f59bf58d3f83d750f8524d1c35849706b..417d548f534b41392a42836fa176c573991ec7ad 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -887,7 +887,7 @@ static void do_emergency_remount(struct work_struct *work)
        struct super_block *sb, *p = NULL;
 
        spin_lock(&sb_lock);
-       list_for_each_entry(sb, &super_blocks, s_list) {
+       list_for_each_entry_reverse(sb, &super_blocks, s_list) {
                if (hlist_unhashed(&sb->s_instances))
                        continue;
                sb->s_count++;