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authorLinus Torvalds <torvalds@g5.osdl.org>2006-04-26 07:47:55 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-26 07:47:55 -0700
commit7b97ebfb931887be63bfa29b6c143e9e9da3f5e8 (patch)
treefaaf77f68ef4192ac1a3c23f43fed122a080d341 /drivers
parent07db8696f5d484485dde77138ff87d19c8628a75 (diff)
parent1ebd32fc54bd04de6b3944587f25513c0681f98e (diff)
Merge branch 'splice' of git://brick.kernel.dk/data/git/linux-2.6-block
* 'splice' of git://brick.kernel.dk/data/git/linux-2.6-block: [PATCH] splice: add ->splice_write support for /dev/null [PATCH] splice: rearrange moving to/from pipe helpers [PATCH] Add support for the sys_vmsplice syscall [PATCH] splice: fix offset problems [PATCH] splice: fix min() warning
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/mem.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 66719f9d294..1fa9fa157c1 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -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__)