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Howlett" Cc: linux-block@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andreas Hindborg X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1846; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=PclSPlh70GQI0xa5AdeesgMZY73x5FcK7yieZwHyBNg=; b=owEBbQKS/ZANAwAKAeG4Gj55KGN3AcsmYgBpklhTMo0te1+0hDGk5iS523JU63TJIgZV6pKQb P0p32p+ORCJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaZJYUwAKCRDhuBo+eShj dz6IEACT5CHYFXwgGMGhVFOsIzIVze2XvGdf11AwPQLHKXovdeWBUGKebfuN/DcQ3OPK9AglXZ5 tm5GgORCPdgssHdGNlfcsNRLHfn6Ln5QKM6AK4Sc7tkaVKu5LYGGWSHcn9GhvVnOx/lpaLszWlN 6mCEKAauIk666pbJOzJ6mlmJSRl04x9sYQfvDzgb9w0tnIihphmkYYMZPWJA31UaUi7v8p4oyMX /pnpFmXu8UwgvIe33s3MB8zKNKeSgG6ZP5uMZV2Qi5iLXqy7Z6+fYFwzqkXLe7OF5ZeC/tTLO+f Xv0AepFCGgEPexiO1cb88/4C3m7gS41joiA8nVtFNYu6d1Su9ckl261r5kyHFZEEEk1jz7W5wa7 YH06lBIytM3mPDDcO010YYmA18RhFXWNv28PxkWHDyobexbUnRr3cVtXGFzODBugO8q2viypqkW cQfJdKYov6juRy+vygspWrsJVhnHaixjGBHrbwA5CVXa5/EMgKj4MDMFibd4KPk8a6Q4b1i12ND La3cQNmfMFAkkWCbMNM2MOd/AuFcgm9CjR3R5NSjKsJ3VMBzsPUiECbEizBCbI8MxBGW5PEcj/n 3bTLvOCGMKucYI/wM4mwXs2D18IMIJ+OhANs+L5A2aZ2HqmA9JcY9ST+ivVR1CR7odYpu55i7r/ xvoD8xIrqD7yQng== X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 X-Rspamd-Queue-Id: 549CDC0006 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: sefoudj8ggmi5jmrzq5wnpttoaq64tdt X-HE-Tag: 1771198969-868959 X-HE-Meta: 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 D1WimBfy 8BZk04isYae4cxdu2k8sc2O4uL3K8M8qdySC2q+wYLJvTtWPrMWgNzU+96jcc3CXOPMglQjhrXhvjSFbE8b6HXXSZB6mzkMx0rnTzz4fkqd/y/Ty6WaUe/z6IHwyPK82Pnm7X3kfMtfw5efdC1JcD+puepJS36c4h/iB1w7d1l0qeLKdFw906DQ4qnDuXfbAB5GMK5VWva3EcYP+aocYJDnq9I8CHyEJByOcpKYcAvCtA/7WGpAWxZs95AVCtiirrLO0NsbApgq3BSIn7BZWdfQd9+qxL2+wr540brkaMSI9G5JS2mftlE2lZ8IPuPfmLyE8ObO3kX6rHmcHJwr4+UbeQN8hdiTJOWUcMm2/iLt20dNIlWhiCV89gnjatLZ6QNu691MLPMmT9Evw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a method to `TagSet` that allows changing the number of hardware queues dynamically. Signed-off-by: Andreas Hindborg --- rust/kernel/block/mq/tag_set.rs | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/rust/kernel/block/mq/tag_set.rs b/rust/kernel/block/mq/tag_set.rs index 4d00979a83dbd..47a162360e628 100644 --- a/rust/kernel/block/mq/tag_set.rs +++ b/rust/kernel/block/mq/tag_set.rs @@ -8,6 +8,7 @@ bindings, block::mq::{operations::OperationsVTable, request::RequestDataWrapper, Operations}, error::{self, Result}, + prelude::*, try_pin_init, types::{ForeignOwnable, Opaque}, }; @@ -34,7 +35,7 @@ pub struct TagSet { } impl TagSet { - /// Try to create a new tag set + /// Try to create a new tag se }t pub fn new( nr_hw_queues: u32, tagset_data: T::TagSetData, @@ -142,6 +143,20 @@ pub fn hw_queue_count(&self) -> u32 { unsafe { (*self.inner.get()).nr_hw_queues } } + /// Update the number of hardware queues for this tag set. + /// + /// This operation may fail if memory for tags cannot be allocated. + pub fn update_hw_queue_count(&self, nr_hw_queues: u32) -> Result { + // SAFETY: blk_mq_update_nr_hw_queues applies internal synchronization. + unsafe { bindings::blk_mq_update_nr_hw_queues(self.inner.get(), nr_hw_queues) } + + if self.hw_queue_count() == nr_hw_queues { + Ok(()) + } else { + Err(ENOMEM) + } + } + /// Borrow the [`T::TagSetData`] associated with this tag set. pub fn data(&self) -> ::Borrowed<'_> { // SAFETY: By type invariant, `self.inner` is valid. -- 2.51.2