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Message-ID: <20240601134005.621714-3-nmi@metaspace.dk>
Date: Sat, 1 Jun 2024 15:40:04 +0200
From: Andreas Hindborg <nmi@...aspace.dk>
To: Jens Axboe <axboe@...nel.dk>,
Christoph Hellwig <hch@....de>,
Keith Busch <kbusch@...nel.org>,
Damien Le Moal <dlemoal@...nel.org>,
Bart Van Assche <bvanassche@....org>,
Hannes Reinecke <hare@...e.de>,
Ming Lei <ming.lei@...hat.com>,
"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Cc: Andreas Hindborg <a.hindborg@...sung.com>,
Greg KH <gregkh@...uxfoundation.org>,
Matthew Wilcox <willy@...radead.org>,
Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Boqun Feng <boqun.feng@...il.com>,
Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Alice Ryhl <aliceryhl@...gle.com>,
Chaitanya Kulkarni <chaitanyak@...dia.com>,
Luis Chamberlain <mcgrof@...nel.org>,
Yexuan Yang <1182282462@...t.edu.cn>,
Sergio González Collado <sergio.collado@...il.com>,
Joel Granados <j.granados@...sung.com>,
"Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
Daniel Gomez <da.gomez@...sung.com>,
Niklas Cassel <Niklas.Cassel@....com>,
Philipp Stanner <pstanner@...hat.com>,
Conor Dooley <conor@...nel.org>,
Johannes Thumshirn <Johannes.Thumshirn@....com>,
Matias Bjørling <m@...rling.me>,
open list <linux-kernel@...r.kernel.org>,
"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
"lsf-pc@...ts.linux-foundation.org" <lsf-pc@...ts.linux-foundation.org>,
"gost.dev@...sung.com" <gost.dev@...sung.com>
Subject: [PATCH v4 2/3] rust: block: add rnull, Rust null_blk implementation
From: Andreas Hindborg <a.hindborg@...sung.com>
This patch adds an initial version of the Rust null block driver.
Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
---
drivers/block/Kconfig | 9 +++++
drivers/block/Makefile | 3 ++
drivers/block/rnull.rs | 81 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 93 insertions(+)
create mode 100644 drivers/block/rnull.rs
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 5b9d4aaebb81..ed209f4f2798 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -354,6 +354,15 @@ config VIRTIO_BLK
This is the virtual block driver for virtio. It can be used with
QEMU based VMMs (like KVM or Xen). Say Y or M.
+config BLK_DEV_RUST_NULL
+ tristate "Rust null block driver (Experimental)"
+ depends on RUST
+ help
+ This is the Rust implementation of the null block driver. For now it
+ is only a minimal stub.
+
+ If unsure, say N.
+
config BLK_DEV_RBD
tristate "Rados block device (RBD)"
depends on INET && BLOCK
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 101612cba303..1105a2d4fdcb 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -9,6 +9,9 @@
# needed for trace events
ccflags-y += -I$(src)
+obj-$(CONFIG_BLK_DEV_RUST_NULL) += rnull_mod.o
+rnull_mod-y := rnull.o
+
obj-$(CONFIG_MAC_FLOPPY) += swim3.o
obj-$(CONFIG_BLK_DEV_SWIM) += swim_mod.o
obj-$(CONFIG_BLK_DEV_FD) += floppy.o
diff --git a/drivers/block/rnull.rs b/drivers/block/rnull.rs
new file mode 100644
index 000000000000..f90808208936
--- /dev/null
+++ b/drivers/block/rnull.rs
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! This is a Rust implementation of the C null block driver.
+//!
+//! Supported features:
+//!
+//! - blk-mq interface
+//! - direct completion
+//! - block size 4k
+//!
+//! The driver is not configurable.
+
+use kernel::{
+ alloc::flags,
+ block::mq::{
+ self,
+ gen_disk::{self, GenDisk},
+ Operations, TagSet,
+ },
+ error::Result,
+ new_mutex, pr_info,
+ prelude::*,
+ sync::{Arc, Mutex},
+ types::ARef,
+};
+
+module! {
+ type: NullBlkModule,
+ name: "rnull_mod",
+ author: "Andreas Hindborg",
+ license: "GPL v2",
+}
+
+struct NullBlkModule {
+ _disk: Pin<Box<Mutex<GenDisk<NullBlkDevice, gen_disk::Added>>>>,
+}
+
+impl kernel::Module for NullBlkModule {
+ fn init(_module: &'static ThisModule) -> Result<Self> {
+ pr_info!("Rust null_blk loaded\n");
+ let tagset = Arc::pin_init(TagSet::try_new(1, 256, 1), flags::GFP_KERNEL)?;
+
+ let disk = {
+ let block_size: u16 = 4096;
+ if block_size % 512 != 0 || !(512..=4096).contains(&block_size) {
+ return Err(kernel::error::code::EINVAL);
+ }
+
+ let mut disk = gen_disk::GenDisk::try_new(tagset)?;
+ disk.set_name(format_args!("rnullb{}", 0))?;
+ disk.set_capacity_sectors(4096 << 11);
+ disk.set_queue_logical_block_size(block_size.into());
+ disk.set_queue_physical_block_size(block_size.into());
+ disk.set_rotational(false);
+ disk.add()?
+ };
+
+ let disk = Box::pin_init(new_mutex!(disk, "nullb:disk"), flags::GFP_KERNEL)?;
+
+ Ok(Self { _disk: disk })
+ }
+}
+
+struct NullBlkDevice;
+
+#[vtable]
+impl Operations for NullBlkDevice {
+ #[inline(always)]
+ fn queue_rq(rq: ARef<mq::Request<Self>>, _is_last: bool) -> Result {
+ mq::Request::end_ok(rq)
+ .map_err(|_e| kernel::error::code::EIO)
+ // We take no refcounts on the request, so we expect to be able to
+ // end the request. The request reference must be uniqueue at this
+ // point, and so `end_ok` cannot fail.
+ .expect("Fatal error - expected to be able to end request");
+
+ Ok(())
+ }
+
+ fn commit_rqs() {}
+}
--
2.45.1
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