[PATCH v2 80/83] block: rust: add `virt_boundary_mask` option to `GenDiskBuilder`

[Andreas Hindborg]

Allow Rust device drivers to set the `virt_boundary_mask` property for
block devices.

Signed-off-by: Andreas Hindborg <a.hindborg@xxxxxxxxxx>
---
 rust/kernel/block/mq/gen_disk.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rust/kernel/block/mq/gen_disk.rs b/rust/kernel/block/mq/gen_disk.rs
index 6d760dafade5..38057ebc0878 100644
--- a/rust/kernel/block/mq/gen_disk.rs
+++ b/rust/kernel/block/mq/gen_disk.rs
@@ -59,6 +59,7 @@ pub struct GenDiskBuilder<T> {
     write_cache: bool,
     forced_unit_access: bool,
     max_sectors: u32,
+    virt_boundary_mask: usize,
     _p: PhantomData<T>,
 }
 
@@ -79,6 +80,7 @@ fn default() -> Self {
             write_cache: false,
             forced_unit_access: false,
             max_sectors: 0,
+            virt_boundary_mask: 0,
             _p: PhantomData,
         }
     }
@@ -189,6 +191,15 @@ pub fn max_sectors(mut self, sectors: u32) -> Self {
         self
     }
 
+    /// Set the I/O segment memory alignment mask for the block device. I/O requests to this device
+    /// will be split between segments wherever either the memory address of the end of the previous
+    /// segment or the memory address of the beginning of the current segment is not aligned to
+    /// virt_boundary_mask + 1 bytes.
+    pub fn virt_boundary_mask(mut self, mask: usize) -> Self {
+        self.virt_boundary_mask = mask;
+        self
+    }
+
     /// Build a new `GenDisk` and add it to the VFS.
     pub fn build(
         self,
@@ -208,6 +219,7 @@ pub fn build(
         lim.physical_block_size = self.physical_block_size;
         lim.max_hw_discard_sectors = self.max_hw_discard_sectors;
         lim.max_sectors = self.max_sectors;
+        lim.virt_boundary_mask = self.virt_boundary_mask;
         if self.rotational {
             lim.features = Feature::Rotational.into();
         }

-- 
2.51.2