1 files changed, 13 insertions, 7 deletions

diff --git a/fs/super.c b/fs/super.c
index bab11bad13ba..0413f51a9f0f 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -337,7 +337,7 @@ bool grab_super_passive(struct super_block *sb)
         spin_unlock(&sb_lock);
 
         if (down_read_trylock(&sb->s_umount)) {
-                if (sb->s_root)
+                if (sb->s_root && (sb->s_flags & MS_BORN))
                         return true;
                 up_read(&sb->s_umount);
         }
@@ -505,7 +505,7 @@ void sync_supers(void)
                         spin_unlock(&sb_lock);
 
                         down_read(&sb->s_umount);
-                        if (sb->s_root && sb->s_dirt)
+                        if (sb->s_root && sb->s_dirt && (sb->s_flags & MS_BORN))
                                 sb->s_op->write_super(sb);
                         up_read(&sb->s_umount);
 
@@ -540,7 +540,7 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
                 spin_unlock(&sb_lock);
 
                 down_read(&sb->s_umount);
-                if (sb->s_root)
+                if (sb->s_root && (sb->s_flags & MS_BORN))
                         f(sb, arg);
                 up_read(&sb->s_umount);
 
@@ -575,7 +575,7 @@ void iterate_supers_type(struct file_system_type *type,
                 spin_unlock(&sb_lock);
 
                 down_read(&sb->s_umount);
-                if (sb->s_root)
+                if (sb->s_root && (sb->s_flags & MS_BORN))
                         f(sb, arg);
                 up_read(&sb->s_umount);
 
@@ -616,7 +616,7 @@ rescan:
                         spin_unlock(&sb_lock);
                         down_read(&sb->s_umount);
                         /* still alive? */
-                        if (sb->s_root)
+                        if (sb->s_root && (sb->s_flags & MS_BORN))
                                 return sb;
                         up_read(&sb->s_umount);
                         /* nope, got unmounted */
@@ -676,7 +676,7 @@ rescan:
                         spin_unlock(&sb_lock);
                         down_read(&sb->s_umount);
                         /* still alive? */
-                        if (sb->s_root)
+                        if (sb->s_root && (sb->s_flags & MS_BORN))
                                 return sb;
                         up_read(&sb->s_umount);
                         /* nope, got unmounted */
@@ -763,7 +763,8 @@ static void do_emergency_remount(struct work_struct *work)
                 sb->s_count++;
                 spin_unlock(&sb_lock);
                 down_write(&sb->s_umount);
-                if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) {
+                if (sb->s_root && sb->s_bdev && (sb->s_flags & MS_BORN) &&
+                    !(sb->s_flags & MS_RDONLY)) {
                         /*
                          * What lock protects sb->s_flags??
                          */
@@ -1146,6 +1147,11 @@ int freeze_super(struct super_block *sb)
                 return -EBUSY;
         }
 
+        if (!(sb->s_flags & MS_BORN)) {
+                up_write(&sb->s_umount);
+                return 0;       /* sic - it's "nothing to do" */
+        }
+
         if (sb->s_flags & MS_RDONLY) {
                 sb->s_frozen = SB_FREEZE_TRANS;
                 smp_wmb();