btrfs: convert extent_map.refs from atomic_t to refcount_t
authorElena Reshetova <elena.reshetova@intel.com>
Fri, 3 Mar 2017 08:55:12 +0000 (10:55 +0200)
committerDavid Sterba <dsterba@suse.com>
Tue, 18 Apr 2017 12:07:23 +0000 (14:07 +0200)
commit490b54d6fb75f6ffd0471ec58bb38a992e2b40cd
treea7f431ea6a0f4369ba43be8736090efd54d6998b
parent9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7
btrfs: convert extent_map.refs from atomic_t to refcount_t

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
fs/btrfs/extent_io.c
fs/btrfs/extent_map.c
fs/btrfs/extent_map.h
fs/btrfs/tree-log.c
fs/btrfs/volumes.c
include/trace/events/btrfs.h