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| author | Jens Axboe <axboe@suse.de> | 2006-04-26 14:40:08 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@suse.de> | 2006-04-26 14:40:08 +0200 |
| commit | 1ebd32fc54bd04de6b3944587f25513c0681f98e (patch) | |
| tree | cc68fe468c7b726fee37fa5e9058004382bae4d0 | |
| parent | 00522fb41a2a9bf0f98a007c0e2b516a3873148c (diff) | |
| download | lwn-1ebd32fc54bd04de6b3944587f25513c0681f98e.tar.gz lwn-1ebd32fc54bd04de6b3944587f25513c0681f98e.zip | |
[PATCH] splice: add ->splice_write support for /dev/null
Useful for testing.
Signed-off-by: Jens Axboe <axboe@suse.de>
| -rw-r--r-- | drivers/char/mem.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 66719f9d294c..1fa9fa157c12 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__) |