Changes in v4: - Improved commit messages and signoff info. - Rebase on top of linux-next as of yesterday. - WARN_ONs are restored since x86 refcount_t does not WARN on zero Changes in v3: No changes in patches apart from trivial rebases, but now by default refcount_t = atomic_t and uses all atomic standard operations unless CONFIG_REFCOUNT_FULL is enabled. This is a compromize for the systems that are critical on performance and cannot accept even slight delay on the refcounter operations. Changes in v2: Not needed WARNs are removed since refcount_t warns by itself. BUG_ONs are left as it is, since refcount_t doesn't bug by default. This series, for block subsystem, replaces atomic_t reference counters with the new refcount_t type and API (see include/linux/refcount.h). By doing this we prevent intentional or accidental underflows or overflows that can lead to use-after-free vulnerabilities. The patches are fully independent and can be cherry-picked separately. If there are no objections to the patches, please merge them via respective trees. Elena Reshetova (6): block: convert bio.__bi_cnt from atomic_t to refcount_t block: convert blk_queue_tag.refcnt from atomic_t to refcount_t block: convert blkcg_gq.refcnt from atomic_t to refcount_t block: convert io_context.active_ref from atomic_t to refcount_t block: convert bsg_device.ref_count from atomic_t to refcount_t drivers, block: convert xen_blkif.refcnt from atomic_t to refcount_t block/bfq-iosched.c | 2 +- block/bio.c | 6 +++--- block/blk-cgroup.c | 2 +- block/blk-ioc.c | 4 ++-- block/blk-tag.c | 8 ++++---- block/bsg.c | 9 +++++---- block/cfq-iosched.c | 4 ++-- drivers/block/xen-blkback/common.h | 7 ++++--- drivers/block/xen-blkback/xenbus.c | 2 +- fs/btrfs/volumes.c | 2 +- include/linux/bio.h | 4 ++-- include/linux/blk-cgroup.h | 11 ++++++----- include/linux/blk_types.h | 3 ++- include/linux/blkdev.h | 3 ++- include/linux/iocontext.h | 7 ++++--- 15 files changed, 40 insertions(+), 34 deletions(-) -- 2.7.4
