From: Andreas Hindborg <a.hindborg@kernel.org>
To: "Boqun Feng" <boqun.feng@gmail.com>,
"Jens Axboe" <axboe@kernel.dk>, "Miguel Ojeda" <ojeda@kernel.org>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"FUJITA Tomonori" <fujita.tomonori@gmail.com>,
"Frederic Weisbecker" <frederic@kernel.org>,
"Lyude Paul" <lyude@redhat.com>,
"Thomas Gleixner" <tglx@kernel.org>,
"Anna-Maria Behnsen" <anna-maria@linutronix.de>,
"John Stultz" <jstultz@google.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: linux-block@vger.kernel.org, rust-for-linux@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andreas Hindborg <a.hindborg@kernel.org>
Subject: [PATCH 66/79] block: rnull: support queue_rqs
Date: Mon, 16 Feb 2026 00:35:53 +0100 [thread overview]
Message-ID: <20260216-rnull-v6-19-rc5-send-v1-66-de9a7af4b469@kernel.org> (raw)
In-Reply-To: <20260216-rnull-v6-19-rc5-send-v1-0-de9a7af4b469@kernel.org>
Implement the `queue_rqs` callback for rnull, allowing the block layer
to submit multiple requests in a single call. This improves performance
by reducing per-request overhead and enabling batch processing.
The implementation processes requests from the list one at a time,
removing successfully processed requests from the list.
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
drivers/block/rnull/disk_storage.rs | 34 +++----
drivers/block/rnull/rnull.rs | 180 +++++++++++++++++++++++-------------
2 files changed, 132 insertions(+), 82 deletions(-)
diff --git a/drivers/block/rnull/disk_storage.rs b/drivers/block/rnull/disk_storage.rs
index b2b5eaa783cdc..d9f2703957fc0 100644
--- a/drivers/block/rnull/disk_storage.rs
+++ b/drivers/block/rnull/disk_storage.rs
@@ -86,7 +86,7 @@ pub(crate) fn discard(
}
}
- pub(crate) fn flush(&self, hw_data: &Pin<&SpinLock<HwQueueContext>>) -> Result {
+ pub(crate) fn flush(&self, hw_data: &Pin<&SpinLock<HwQueueContext>>) {
let mut tree_guard = self.lock();
let mut hw_data_guard = hw_data.lock();
let mut access = self.access(&mut tree_guard, &mut hw_data_guard, None);
@@ -129,16 +129,10 @@ fn to_sector(index: usize) -> u64 {
(index << block::PAGE_SECTORS_SHIFT) as u64
}
- fn extract_cache_page(&mut self) -> Result<Option<KBox<NullBlockPage>>> {
+ fn extract_cache_page(&mut self) -> Option<KBox<NullBlockPage>> {
let cache_entry = self.cache_guard.find_next_entry_circular(
self.disk_storage.next_flush_sector.load(ordering::Relaxed) as usize,
- );
-
- let cache_entry = if let Some(entry) = cache_entry {
- entry
- } else {
- return Ok(None);
- };
+ )?;
let index = cache_entry.index();
@@ -168,11 +162,14 @@ fn extract_cache_page(&mut self) -> Result<Option<KBox<NullBlockPage>>> {
let mut src = cache_entry;
let mut offset = 0;
for _ in 0..PAGE_SECTORS {
- src.page_mut().get_pin_mut().copy_to_page(
- disk_entry.page_mut().get_pin_mut(),
- offset,
- block::SECTOR_SIZE as usize,
- )?;
+ src.page_mut()
+ .get_pin_mut()
+ .copy_to_page(
+ disk_entry.page_mut().get_pin_mut(),
+ offset,
+ block::SECTOR_SIZE as usize,
+ )
+ .expect("Write to succeed");
offset += block::SECTOR_SIZE as usize;
}
src.remove()
@@ -182,16 +179,15 @@ fn extract_cache_page(&mut self) -> Result<Option<KBox<NullBlockPage>>> {
}
};
- Ok(Some(page))
+ Some(page)
}
- fn flush(&mut self) -> Result {
+ fn flush(&mut self) {
if self.disk_storage.cache_size > 0 {
- while let Some(page) = self.extract_cache_page()? {
+ while let Some(page) = self.extract_cache_page() {
drop(page);
}
}
- Ok(())
}
fn get_or_alloc_cache_page(&mut self, sector: u64) -> Result<&mut NullBlockPage> {
@@ -208,7 +204,7 @@ fn get_or_alloc_cache_page(&mut self, sector: u64) -> Result<&mut NullBlockPage>
.take()
.expect("Expected to have a page available")
} else {
- self.extract_cache_page()?
+ self.extract_cache_page()
.expect("Expected to find a page in the cache")
};
Ok(self
diff --git a/drivers/block/rnull/rnull.rs b/drivers/block/rnull/rnull.rs
index 429819bf042ba..592fbf5790fd2 100644
--- a/drivers/block/rnull/rnull.rs
+++ b/drivers/block/rnull/rnull.rs
@@ -28,7 +28,7 @@
BadBlocks, //
},
bio::Segment,
- error::BlkResult,
+ error::{BlkError, BlkResult},
mq::{
self,
gen_disk::{
@@ -36,8 +36,10 @@
GenDisk,
GenDiskRef, //
},
+ IdleRequest,
IoCompletionBatch,
Operations,
+ RequestList,
TagSet, //
},
SECTOR_SHIFT,
@@ -720,6 +722,104 @@ fn complete_request(&self, rq: Owned<mq::Request<Self>>) {
}
}
}
+
+ #[inline(always)]
+ fn queue_rq_internal(
+ hw_data: Pin<&SpinLock<HwQueueContext>>,
+ this: ArcBorrow<'_, Self>,
+ rq: Owned<mq::IdleRequest<Self>>,
+ _is_last: bool,
+ ) -> Result<(), QueueRequestError> {
+ if this.bandwidth_limit != 0 {
+ if !this.bandwidth_timer.active() {
+ drop(this.bandwidth_timer_handle.lock().take());
+ let arc: Arc<_> = this.into();
+ *this.bandwidth_timer_handle.lock() =
+ Some(arc.start(Self::BANDWIDTH_TIMER_INTERVAL));
+ }
+
+ if this
+ .bandwidth_bytes
+ .fetch_add(u64::from(rq.bytes()), ordering::Relaxed)
+ + u64::from(rq.bytes())
+ > this.bandwidth_limit
+ {
+ rq.queue().stop_hw_queues();
+ if this.bandwidth_bytes.load(ordering::Relaxed) <= this.bandwidth_limit {
+ rq.queue().start_stopped_hw_queues_async();
+ }
+
+ return Err(QueueRequestError { request: rq });
+ }
+ }
+
+ let mut rq = rq.start();
+
+ if rq.command() == mq::Command::Flush {
+ if this.memory_backed {
+ this.storage.flush(&hw_data);
+ }
+ this.complete_request(rq);
+
+ return Ok(());
+ }
+
+ let status = (|| -> Result {
+ #[cfg(CONFIG_BLK_DEV_ZONED)]
+ if this.zoned.enabled {
+ this.handle_zoned_command(&hw_data, &mut rq)?;
+ } else {
+ this.handle_regular_command(&hw_data, &mut rq)?;
+ }
+
+ #[cfg(not(CONFIG_BLK_DEV_ZONED))]
+ this.handle_regular_command(&hw_data, &mut rq)?;
+
+ Ok(())
+ })();
+
+ if let Err(e) = status {
+ // Do not overwrite existing error. We do not care whether this write fails.
+ let _ = rq
+ .data_ref()
+ .error
+ .cmpxchg(0, e.to_errno(), ordering::Relaxed);
+ }
+
+ if rq.is_poll() {
+ // NOTE: We lack the ability to insert `Owned<Request>` into a
+ // `kernel::list::List`, so we use a `RingBuffer` instead. The
+ // drawback of this is that we have to allocate the space for the
+ // ring buffer during drive initialization, and we have to hold the
+ // lock protecting the list until we have processed all the requests
+ // in the list. Change to a linked list when the kernel gets this
+ // ability.
+
+ // NOTE: We are processing requests during submit rather than during
+ // poll. This is different from C driver. C driver does processing
+ // during poll.
+
+ hw_data
+ .lock()
+ .poll_queue
+ .push_head(rq)
+ .expect("Buffer is sized to hold all in flight requests");
+ } else {
+ this.complete_request(rq);
+ }
+
+ Ok(())
+ }
+}
+
+struct QueueRequestError {
+ request: Owned<IdleRequest<NullBlkDevice>>,
+}
+
+impl From<QueueRequestError> for BlkError {
+ fn from(_value: QueueRequestError) -> Self {
+ kernel::block::error::code::BLK_STS_IOERR
+ }
}
impl_has_hr_timer! {
@@ -761,7 +861,7 @@ struct HwQueueContext {
struct Pdu {
#[pin]
timer: HrTimer<Self>,
- error: Atomic<u32>,
+ error: Atomic<i32>,
}
impl HrTimerCallback for Pdu {
@@ -802,76 +902,31 @@ fn new_request_data() -> impl PinInit<Self::RequestData> {
})
}
- #[inline(always)]
fn queue_rq(
hw_data: Pin<&SpinLock<HwQueueContext>>,
this: ArcBorrow<'_, Self>,
rq: Owned<mq::IdleRequest<Self>>,
- _is_last: bool,
- is_poll: bool,
+ is_last: bool,
+ _is_poll: bool,
) -> BlkResult {
- if this.bandwidth_limit != 0 {
- if !this.bandwidth_timer.active() {
- drop(this.bandwidth_timer_handle.lock().take());
- let arc: Arc<_> = this.into();
- *this.bandwidth_timer_handle.lock() =
- Some(arc.start(Self::BANDWIDTH_TIMER_INTERVAL));
- }
+ Ok(Self::queue_rq_internal(hw_data, this, rq, is_last)?)
+ }
- if this
- .bandwidth_bytes
- .fetch_add(u64::from(rq.bytes()), ordering::Relaxed)
- + u64::from(rq.bytes())
- > this.bandwidth_limit
+ fn queue_rqs(
+ hw_data: Pin<&SpinLock<HwQueueContext>>,
+ this: ArcBorrow<'_, Self>,
+ requests: &mut RequestList<Self>,
+ ) {
+ let mut requeue = RequestList::new();
+ while let Some(request) = requests.pop() {
+ if let Err(QueueRequestError { request }) =
+ Self::queue_rq_internal(hw_data, this, request, false)
{
- rq.queue().stop_hw_queues();
- if this.bandwidth_bytes.load(ordering::Relaxed) <= this.bandwidth_limit {
- rq.queue().start_stopped_hw_queues_async();
- }
-
- return Err(kernel::block::error::code::BLK_STS_DEV_RESOURCE);
+ requeue.push_tail(request);
}
}
- let mut rq = rq.start();
-
- if rq.command() == mq::Command::Flush {
- if this.memory_backed {
- this.storage.flush(&hw_data)?;
- }
- this.complete_request(rq);
-
- return Ok(());
- }
-
- #[cfg(CONFIG_BLK_DEV_ZONED)]
- if this.zoned.enabled {
- this.handle_zoned_command(&hw_data, &mut rq)?;
- } else {
- this.handle_regular_command(&hw_data, &mut rq)?;
- }
-
- #[cfg(not(CONFIG_BLK_DEV_ZONED))]
- this.handle_regular_command(&hw_data, &mut rq)?;
-
- if is_poll {
- // NOTE: We lack the ability to insert `Owned<Request>` into a
- // `kernel::list::List`, so we use a `RingBuffer` instead. The
- // drawback of this is that we have to allocate the space for the
- // ring buffer during drive initialization, and we have to hold the
- // lock protecting the list until we have processed all the requests
- // in the list. Change to a linked list when the kernel gets this
- // ability.
-
- // NOTE: We are processing requests during submit rather than during
- // poll. This is different from C driver. C driver does processing
- // during poll.
-
- hw_data.lock().poll_queue.push_head(rq)?;
- } else {
- this.complete_request(rq);
- }
- Ok(())
+ drop(core::mem::replace(requests, requeue));
}
fn commit_rqs(_hw_data: Pin<&SpinLock<HwQueueContext>>, _queue_data: ArcBorrow<'_, Self>) {}
@@ -888,7 +943,6 @@ fn poll(
let status = rq.data_ref().error.load(ordering::Relaxed);
rq.data_ref().error.store(0, ordering::Relaxed);
- // TODO: check error handling via status
if let Err(rq) = batch.add_request(rq, status != 0) {
Self::end_request(rq);
}
--
2.51.2
next prev parent reply other threads:[~2026-02-16 4:13 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-15 23:34 [PATCH 00/79] block: rnull: complete the rust null block driver Andreas Hindborg
2026-02-15 23:34 ` [PATCH 01/79] block: rnull: adopt new formatting guidelines Andreas Hindborg
2026-02-15 23:34 ` [PATCH 02/79] block: rnull: add module parameters Andreas Hindborg
2026-02-15 23:34 ` [PATCH 03/79] block: rnull: add macros to define configfs attributes Andreas Hindborg
2026-02-15 23:34 ` [PATCH 04/79] block: rust: fix generation of bindings to `BLK_STS_.*` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 05/79] block: rust: change `queue_rq` request type to `Owned` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 06/79] block: rust: add `Request` private data support Andreas Hindborg
2026-02-15 23:34 ` [PATCH 07/79] block: rust: allow `hrtimer::Timer` in `RequestData` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 08/79] block: rnull: add timer completion mode Andreas Hindborg
2026-02-15 23:34 ` [PATCH 09/79] block: rust: introduce `kernel::block::bio` module Andreas Hindborg
2026-02-15 23:34 ` [PATCH 10/79] block: rust: add `command` getter to `Request` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 11/79] block: rust: mq: use GFP_KERNEL from prelude Andreas Hindborg
2026-02-15 23:34 ` [PATCH 12/79] block: rust: add `TagSet` flags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 13/79] block: rnull: add memory backing Andreas Hindborg
2026-02-15 23:35 ` [PATCH 14/79] block: rnull: add submit queue count config option Andreas Hindborg
2026-02-15 23:35 ` [PATCH 15/79] block: rnull: add `use_per_node_hctx` " Andreas Hindborg
2026-02-15 23:35 ` [PATCH 16/79] block: rust: allow specifying home node when constructing `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 17/79] block: rnull: allow specifying the home numa node Andreas Hindborg
2026-02-15 23:35 ` [PATCH 18/79] block: rust: add Request::sectors() method Andreas Hindborg
2026-02-15 23:35 ` [PATCH 19/79] block: rust: mq: add max_hw_discard_sectors support to GenDiskBuilder Andreas Hindborg
2026-02-15 23:35 ` [PATCH 20/79] block: rnull: add discard support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 21/79] block: rust: add `NoDefaultScheduler` flag for `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 22/79] block: rnull: add no_sched module parameter and configfs attribute Andreas Hindborg
2026-02-15 23:35 ` [PATCH 23/79] block: rust: change sector type from usize to u64 Andreas Hindborg
2026-02-15 23:35 ` [PATCH 24/79] block: rust: add `BadBlocks` for bad block tracking Andreas Hindborg
2026-02-15 23:35 ` [PATCH 25/79] block: rust: mq: add Request::end() method for custom status codes Andreas Hindborg
2026-02-15 23:35 ` [PATCH 26/79] block: rnull: add badblocks support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 27/79] block: rnull: add badblocks_once support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 28/79] block: rnull: add partial I/O support for bad blocks Andreas Hindborg
2026-02-15 23:35 ` [PATCH 29/79] block: rust: add `TagSet` private data support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 30/79] block: rust: add `hctx` " Andreas Hindborg
2026-02-15 23:35 ` [PATCH 31/79] block: rnull: add volatile cache emulation Andreas Hindborg
2026-02-15 23:35 ` [PATCH 32/79] block: rust: implement `Sync` for `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 33/79] block: rust: add a back reference feature to `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 34/79] block: rust: introduce an idle type state for `Request` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 35/79] block: rust: add a request queue abstraction Andreas Hindborg
2026-02-15 23:35 ` [PATCH 36/79] block: rust: add a method to get the request queue for a request Andreas Hindborg
2026-02-15 23:35 ` [PATCH 37/79] block: rust: introduce `kernel::block::error` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 38/79] block: rust: require `queue_rq` to return a `BlkResult` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 39/79] block: rust: add `GenDisk::queue_data` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 40/79] block: rnull: add bandwidth limiting Andreas Hindborg
2026-02-15 23:35 ` [PATCH 41/79] block: rnull: add blocking queue mode Andreas Hindborg
2026-02-15 23:35 ` [PATCH 42/79] block: rnull: add shared tags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 43/79] block: rnull: add queue depth config option Andreas Hindborg
2026-02-15 23:35 ` [PATCH 44/79] block: rust: add an abstraction for `bindings::req_op` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 45/79] block: rust: add a method to set the target sector of a request Andreas Hindborg
2026-02-15 23:35 ` [PATCH 46/79] block: rust: move gendisk vtable construction to separate function Andreas Hindborg
2026-02-15 23:35 ` [PATCH 47/79] block: rust: add zoned block device support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 48/79] block: rnull: add zoned storage support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 49/79] block: rust: add `map_queues` support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 50/79] block: rust: add an abstraction for `struct blk_mq_queue_map` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 51/79] block: rust: add polled completion support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 52/79] block: rust: add accessors to `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 53/79] block: rnull: add polled completion support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 54/79] block: rnull: add REQ_OP_FLUSH support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 55/79] block: rust: add request flags abstraction Andreas Hindborg
2026-02-15 23:35 ` [PATCH 56/79] block: rust: add abstraction for block queue feature flags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 57/79] block: rust: allow setting write cache and FUA flags for `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 58/79] block: rust: add `Segment::copy_to_page_limit` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 59/79] block: rnull: add fua support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 60/79] block: fix arg type in `blk_mq_update_nr_hw_queues` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 61/79] block: rust: add `GenDisk::tag_set` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 62/79] block: rust: add `TagSet::update_hw_queue_count` Andreas Hindborg
2026-02-16 23:59 ` Ken Kurematsu
2026-02-17 9:54 ` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 63/79] block: rnull: add an option to change the number of hardware queues Andreas Hindborg
2026-02-15 23:35 ` [PATCH 64/79] block: rust: add an abstraction for `struct rq_list` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 65/79] block: rust: add `queue_rqs` vtable hook Andreas Hindborg
2026-02-15 23:35 ` Andreas Hindborg [this message]
2026-02-15 23:35 ` [PATCH 67/79] block: rust: remove the `is_poll` parameter from `queue_rq` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 68/79] block: rust: add a debug assert for refcounts Andreas Hindborg
2026-02-15 23:35 ` [PATCH 69/79] block: rust: add `TagSet::tag_to_rq` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 70/79] block: rust: add `Request::queue_index` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 71/79] block: rust: add `Request::requeue` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 72/79] block: rust: add `request_timeout` hook Andreas Hindborg
2026-02-15 23:36 ` [PATCH 73/79] block: rnull: add fault injection support Andreas Hindborg
2026-02-15 23:36 ` [PATCH 74/79] block: rust: add max_sectors option to `GenDiskBuilder` Andreas Hindborg
2026-02-15 23:36 ` [PATCH 75/79] block: rnull: allow configuration of the maximum IO size Andreas Hindborg
2026-02-15 23:36 ` [PATCH 76/79] block: rust: add `virt_boundary_mask` option to `GenDiskBuilder` Andreas Hindborg
2026-02-15 23:36 ` [PATCH 77/79] block: rnull: add `virt_boundary` option Andreas Hindborg
2026-02-15 23:36 ` [PATCH 78/79] block: rnull: add `shared_tag_bitmap` config option Andreas Hindborg
2026-02-15 23:36 ` [PATCH 79/79] block: rnull: add zone offline and readonly configfs files Andreas Hindborg
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