rust: block: require Sync for Operations::QueueData#941
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The queue data installed in a `GenDisk` is stored in the request queue and handed back to the driver as a shared borrow through the `queue_rq` and `commit_rqs` callbacks. Both callbacks obtain that borrow via `ForeignOwnable::borrow` and may execute concurrently on several CPUs, since the block layer runs one hardware queue per CPU. That means a shared reference to the same queue data can be live on multiple threads at once, which is only sound when the referent is `Sync`. The initial `GenDisk` private data support omitted this bound, so a driver could install a non-`Sync` type as queue data and then access it concurrently from multiple CPUs without synchronization. Add a `Sync` bound to the `QueueData` associated type to rule that out. Fixes: 90d952f ("rust: block: add `GenDisk` private data support") Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Gary Guo <gary@garyguo.net>
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Pull request for series with
subject: rust: block: require
SyncforOperations::QueueDataversion: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1107573