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Subject[PATCH 0/6] v4 block refcount conversion patches
Date
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

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