/* resize CQ ring */
IORING_REGISTER_RESIZE_RINGS = 33,
+ IORING_REGISTER_MEM_REGION = 34,
+
/* this goes last */
IORING_REGISTER_LAST,
__u64 __resv[4];
};
+struct io_uring_mem_region_reg {
+ __u64 region_uptr; /* struct io_uring_region_desc * */
+ __u64 flags;
+ __u64 __resv[2];
+};
+
/*
* Register a fully sparse file space, rather than pass in an array of all
* -1 file descriptors.
io_alloc_cache_free(&ctx->msg_cache, io_msg_cache_free);
io_futex_cache_free(ctx);
io_destroy_buffers(ctx);
+ io_free_region(ctx, &ctx->param_region);
mutex_unlock(&ctx->uring_lock);
if (ctx->sq_creds)
put_cred(ctx->sq_creds);
return ret;
}
+static int io_register_mem_region(struct io_ring_ctx *ctx, void __user *uarg)
+{
+ struct io_uring_mem_region_reg __user *reg_uptr = uarg;
+ struct io_uring_mem_region_reg reg;
+ struct io_uring_region_desc __user *rd_uptr;
+ struct io_uring_region_desc rd;
+ int ret;
+
+ if (io_region_is_set(&ctx->param_region))
+ return -EBUSY;
+ if (copy_from_user(®, reg_uptr, sizeof(reg)))
+ return -EFAULT;
+ rd_uptr = u64_to_user_ptr(reg.region_uptr);
+ if (copy_from_user(&rd, rd_uptr, sizeof(rd)))
+ return -EFAULT;
+
+ if (memchr_inv(®.__resv, 0, sizeof(reg.__resv)))
+ return -EINVAL;
+ if (reg.flags)
+ return -EINVAL;
+
+ ret = io_create_region(ctx, &ctx->param_region, &rd);
+ if (ret)
+ return ret;
+ if (copy_to_user(rd_uptr, &rd, sizeof(rd))) {
+ io_free_region(ctx, &ctx->param_region);
+ return -EFAULT;
+ }
+ return 0;
+}
+
static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
void __user *arg, unsigned nr_args)
__releases(ctx->uring_lock)
break;
ret = io_register_resize_rings(ctx, arg);
break;
+ case IORING_REGISTER_MEM_REGION:
+ ret = -EINVAL;
+ if (!arg || nr_args != 1)
+ break;
+ ret = io_register_mem_region(ctx, arg);
+ break;
default:
ret = -EINVAL;
break;