To avoid races that lead to use-after-free errors during esnap device
hot add/remove, we need a way to ensure that the destroy callback does
not free a bs_dev until all consumers are done.
This adds reference counting to the create_channel() and
destroy_channel() callbacks. The reference couunt is initialized to 1
and is decremented by destroy(). The destroy() and destroy_channel()
callbacks are updated to free the bs_dev only when the reference count
drops to 0.
Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: Ie0b873717e431b33ce6548f878643dbc66d4f956
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16422
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
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