• Josef Bacik's avatar
    Btrfs: use rcu to protect device->name · 606686ee
    Josef Bacik authored
    Al pointed out that we can just toss out the old name on a device and add a
    new one arbitrarily, so anybody who uses device->name in printk could
    possibly use free'd memory.  Instead of adding locking around all of this he
    suggested doing it with RCU, so I've introduced a struct rcu_string that
    does just that and have gone through and protected all accesses to
    device->name that aren't under the uuid_mutex with rcu_read_lock().  This
    protects us and I will use it for dealing with removing the device that we
    used to mount the file system in a later patch.  Thanks,
    Reviewed-by: default avatarDavid Sterba <dsterba@suse.cz>
    Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
rcu-string.h 1.51 KB