Allow drivers to set the maximum I/O size when building a `GenDisk`.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/block/mq/gen_disk.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/rust/kernel/block/mq/gen_disk.rs b/rust/kernel/block/mq/gen_disk.rs
index a50ba7b605d7..6d760dafade5 100644
--- a/rust/kernel/block/mq/gen_disk.rs
+++ b/rust/kernel/block/mq/gen_disk.rs
@@ -58,6 +58,7 @@ pub struct GenDiskBuilder<T> {
     zone_append_max_sectors: u32,
     write_cache: bool,
     forced_unit_access: bool,
+    max_sectors: u32,
     _p: PhantomData<T>,
 }
 
@@ -77,6 +78,7 @@ fn default() -> Self {
             zone_append_max_sectors: 0,
             write_cache: false,
             forced_unit_access: false,
+            max_sectors: 0,
             _p: PhantomData,
         }
     }
@@ -181,6 +183,12 @@ pub fn write_cache(mut self, enable: bool) -> Self {
         self
     }
 
+    /// Maximum size of a command in 512 byte sectors.
+    pub fn max_sectors(mut self, sectors: u32) -> Self {
+        self.max_sectors = sectors;
+        self
+    }
+
     /// Build a new `GenDisk` and add it to the VFS.
     pub fn build(
         self,
@@ -199,6 +207,7 @@ pub fn build(
         lim.logical_block_size = self.logical_block_size;
         lim.physical_block_size = self.physical_block_size;
         lim.max_hw_discard_sectors = self.max_hw_discard_sectors;
+        lim.max_sectors = self.max_sectors;
         if self.rotational {
             lim.features = Feature::Rotational.into();
         }

-- 
2.51.2