fs: Fix imbalance in freeze protection in mark_files_ro()

File descriptors (even those for writing) do not hold freeze protection.
Thus mark_files_ro() must call __mnt_drop_write() to only drop protection
against remount read-only. Calling mnt_drop_write_file() as we do now
results in:

[ BUG: bad unlock balance detected! ]
3.7.0-rc6-00028-g88e75b6 #101 Not tainted
-------------------------------------
kworker/1:2/79 is trying to release lock (sb_writers) at:
[<ffffffff811b33b4>] mnt_drop_write+0x24/0x30
but there are no more locks to release!

Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/file_table.c b/fs/file_table.c
index a72bf9d..de9e965 100644 (file)
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -458,8 +458,8 @@ void mark_files_ro(struct super_block *sb)
                spin_unlock(&f->f_lock);
                if (file_check_writeable(f) != 0)
                        continue;
+               __mnt_drop_write(f->f_path.mnt);
                file_release_write(f);
-               mnt_drop_write_file(f);
        } while_file_list_for_each_entry;
        lg_global_unlock(&files_lglock);
 }