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[PATCH] splice: add ->splice_write support for /dev/null
Useful for testing. Signed-off-by: Jens Axboe <axboe@suse.de>
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1 changed files with 14 additions and 0 deletions
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@ -27,6 +27,7 @@
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#include <linux/crash_dump.h>
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#include <linux/backing-dev.h>
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#include <linux/bootmem.h>
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#include <linux/pipe_fs_i.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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@ -578,6 +579,18 @@ static ssize_t write_null(struct file * file, const char __user * buf,
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return count;
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}
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static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
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struct splice_desc *sd)
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{
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return sd->len;
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}
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static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out,
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loff_t *ppos, size_t len, unsigned int flags)
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{
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return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
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}
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#ifdef CONFIG_MMU
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/*
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* For fun, we are using the MMU for this.
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@ -785,6 +798,7 @@ static struct file_operations null_fops = {
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.llseek = null_lseek,
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.read = read_null,
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.write = write_null,
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.splice_write = splice_write_null,
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};
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#if defined(CONFIG_ISA) || !defined(__mc68000__)
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