[PATCH] splice: add ->splice_write support for /dev/null (1ebd32fc) · Commits · e / devices / android_kernel_teracube_emerald

drivers/char/mem.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@
		#include <linux/crash_dump.h>
		#include <linux/backing-dev.h>
		#include <linux/bootmem.h>
		#include <linux/pipe_fs_i.h>

		#include <asm/uaccess.h>
		#include <asm/io.h>
		@@ -578,6 +579,18 @@ static ssize_t write_null(struct file * file, const char __user * buf,
		return count;
		}

		static int pipe_to_null(struct pipe_inode_info info, struct pipe_buffer buf,
		struct splice_desc *sd)
		{
		return sd->len;
		}

		static ssize_t splice_write_null(struct pipe_inode_info pipe,struct file out,
		loff_t *ppos, size_t len, unsigned int flags)
		{
		return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
		}

		#ifdef CONFIG_MMU
		/*
		* For fun, we are using the MMU for this.
		@@ -785,6 +798,7 @@ static struct file_operations null_fops = {
		.llseek = null_lseek,
		.read = read_null,
		.write = write_null,
		.splice_write = splice_write_null,
		};

		#if defined(CONFIG_ISA) \|\| !defined(__mc68000__)