rust: block: do not use removed queue limit API

The Rust block layer API was using the old queue limit API, which was just
removed. Use the new API instead.

Reported-by: Boqun Feng <boqun.feng@gmail.com>
Fixes: 3253aba3

 ("rust: block: introduce `kernel::block::mq` module")
Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
Link: https://lore.kernel.org/r/20240614235350.621121-1-nmi@metaspace.dk


Signed-off-by: Jens Axboe <axboe@kernel.dk>

rust/kernel/block/mq/gen_disk.rs

@@ -95,11 +95,17 @@ pub fn build<T: Operations>(
     ) -> Result<GenDisk<T>> {
         let lock_class_key = crate::sync::LockClassKey::new();
 
+        // SAFETY: `bindings::queue_limits` contain only fields that are valid when zeroed.
+        let mut lim: bindings::queue_limits = unsafe { core::mem::zeroed() };
+
+        lim.logical_block_size = self.logical_block_size;
+        lim.physical_block_size = self.physical_block_size;
+
         // SAFETY: `tagset.raw_tag_set()` points to a valid and initialized tag set
         let gendisk = from_err_ptr(unsafe {
             bindings::__blk_mq_alloc_disk(
                 tagset.raw_tag_set(),
-                core::ptr::null_mut(), // TODO: We can pass queue limits right here
+                &mut lim,
                 core::ptr::null_mut(),
                 lock_class_key.as_ptr(),
             )
@@ -141,18 +147,6 @@ pub fn build<T: Operations>(
         raw_writer.write_fmt(name)?;
         raw_writer.write_char('\0')?;
 
-        // SAFETY: `gendisk` points to a valid and initialized instance of
-        // `struct gendisk`. We have exclusive access, so we cannot race.
-        unsafe {
-            bindings::blk_queue_logical_block_size((*gendisk).queue, self.logical_block_size)
-        };
-
-        // SAFETY: `gendisk` points to a valid and initialized instance of
-        // `struct gendisk`. We have exclusive access, so we cannot race.
-        unsafe {
-            bindings::blk_queue_physical_block_size((*gendisk).queue, self.physical_block_size)
-        };
-
         // SAFETY: `gendisk` points to a valid and initialized instance of
         // `struct gendisk`. `set_capacity` takes a lock to synchronize this
         // operation, so we will not race.