[dm-devel] [PATCH 0/3] dm: replace atomic_t reference counters with refcount_t

John Pittman jpittman at redhat.com
Thu Aug 23 17:35:54 UTC 2018

This series of patches further integrates the refcount_t API into
the device-mapper layer.  The refcount_t API works to prevent counter
overflows and use-after-free bugs, so should make the
mechanism more robust, and make troubleshooting easier. Adding here
to dm-thin and dm-zoned.

Refcounters changed listed below:
 struct thin_c -> refcount
 struct dmz_bioctx -> ref
 struct dm_chunk_work -> refcount
 struct dmz_mblock -> ref
 struct dm_zone -> refcount

John Pittman (3):
 dm thin: use refcount_t for thin_c reference counting
 dm zoned: metadata: use refcount_t for dm zoned reference
 dm zoned: target: use refcount_t for dm zoned reference

 drivers/md/dm-thin.c | 8 ++++----
 drivers/md/dm-zoned-metadata.c | 25 +++++++++++++------------
 drivers/md/dm-zoned.h          |  2 +-
 drivers/md/dm-zoned-target.c | 20 ++++++++++----------

Best Regards,

John Pittman
Customer Engagement and Experience
Red Hat Inc.

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