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Howlett" , linux-block@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Content-Type: text/plain; charset="utf-8" On Mon, Feb 16, 2026 at 12:34:57AM +0100, Andreas Hindborg wrote: > Add a method to extract the command operation code from a request. The > command is obtained by masking the lower bits of `cmd_flags` as defined by > `REQ_OP_BITS`. This allows Rust block drivers to determine the type of > operation being requested. > > Signed-off-by: Andreas Hindborg With the nit below fixed: Reviewed-by: Alice Ryhl > rust/kernel/block/mq/request.rs | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/rust/kernel/block/mq/request.rs b/rust/kernel/block/mq/request.rs > index b49197a0c66d7..0dd329ae93dfc 100644 > --- a/rust/kernel/block/mq/request.rs > +++ b/rust/kernel/block/mq/request.rs > @@ -78,6 +78,12 @@ pub(crate) unsafe fn aref_from_raw(ptr: *mut bindings::request) -> ARef { > unsafe { ARef::from_raw(NonNull::new_unchecked(ptr.cast())) } > } > > + /// Get the command identifier for the request > + pub fn command(&self) -> u32 { > + // SAFETY: By C API contract and type invariant, `cmd_flags` is valid for read > + unsafe { (*self.0.get()).cmd_flags & ((1 << bindings::REQ_OP_BITS) - 1) } Nit: scope of unsafe unsafe { (*self.0.get()).cmd_flags } & ((1 << bindings::REQ_OP_BITS) - 1)