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[PATCH] splice: add ->splice_write support for /dev/null

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Useful for testing.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-04-26 14:40:08 +02:00
parent 00522fb41a
commit 1ebd32fc54
1 changed files with 14 additions and 0 deletions
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14
drivers/char/mem.c
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@ -27,6 +27,7 @@
#include <linux/crash_dump.h> #include <linux/crash_dump.h>
#include <linux/backing-dev.h> #include <linux/backing-dev.h>
#include <linux/bootmem.h> #include <linux/bootmem.h>
#include <linux/pipe_fs_i.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/io.h> #include <asm/io.h>
@ -578,6 +579,18 @@ static ssize_t write_null(struct file * file, const char __user * buf,
return count; 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 #ifdef CONFIG_MMU
/* /*
* For fun, we are using the MMU for this. * For fun, we are using the MMU for this.
@ -785,6 +798,7 @@ static struct file_operations null_fops = {
.llseek = null_lseek, .llseek = null_lseek,
.read = read_null, .read = read_null,
.write = write_null, .write = write_null,
.splice_write = splice_write_null,
}; };
#if defined(CONFIG_ISA) || !defined(__mc68000__) #if defined(CONFIG_ISA) || !defined(__mc68000__)