From 2eadc2177a673c5ca5130d677c0eebca8a8eb981 Mon Sep 17 00:00:00 2001
From: Samuel Hunter <samuel@shunter.xyz>
Date: Sat, 22 Aug 2026 10:55:23 -0700
Subject: [PATCH] IoUring: fix register_file_alloc_range EINVAL err

Fixes ziglang/zig#36597. The syscall io_uring_register with opcode
REGISTER_FILE_ALLOC_RANGE will always return -EINVAL unless `nr_args` is
zero.
---
 lib/std/os/linux/IoUring.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/std/os/linux/IoUring.zig b/lib/std/os/linux/IoUring.zig
index a3723244cd9b23a04bd2dacf800fd83b95d39a4c..cfd31561de8fad4c70b78682e6aa3647068a79af 100644
--- a/lib/std/os/linux/IoUring.zig
+++ b/lib/std/os/linux/IoUring.zig
@@ -1230,7 +1230,7 @@ pub fn register_file_alloc_range(self: *IoUring, offset: u32, len: u32) !void {
         self.fd,
         .REGISTER_FILE_ALLOC_RANGE,
         @ptrCast(range),
-        @as(u32, @sizeOf(linux.io_uring_file_index_range)),
+        0,
     );
 
     return handle_registration_result(res);
-- 
2.54.0