Manas K Nayak wrote:
> Hi Suresh,
>
>> This patch attempts to add splice writes support. In essence, it just
>> calls generic_file_splice_write() after doing a little sanity check.
>> This would allow LTTng users that are using NFS to store trace data.
>> There could be more applications that could be benefitted too.
>>
>> I have tested this using the Jens' test program and have found no
>> real issues. The test program is inlined below:
>>
>> /*
>> * splice-out.c: Splice stdout to file
>> */
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <unistd.h>
>> #include <fcntl.h>
>>
>> #define SPLICE_SIZE (64*1024)
>>
>> int main(int argc, char *argv[])
>> {
>> int fd;
>>
>> if (argc < 2) {
>> printf("%s: outfile\n", argv[0]);
>> return 1;
>> }
>>
>> fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
>> if (fd < 0) {
>> perror("open");
>> return 1;
>> }
>>
>> do {
>> int ret = splice(STDIN_FILENO, NULL, fd, NULL, SPLICE_SIZE, 0);
>>
>> if (ret < 0) {
>> perror("splice");
>> break;
>> } else if (ret < SPLICE_SIZE)
>> break;
>> } while (1);
>>
>> close(fd);
>> return 0;
>> }
>>
>> Compile with -D _GNU_SOURCE and do something like:
>> echo "some stuff" | ./splice-out <outfile>
>>
>>
>
> I picked up this test program written by you and ported this to LTP
> under GPL. If you do not have any objection(s), can we contribute this
> to LTP ? The following patch will do exactly that.
Well, it's orginally from Jens Axboe <[email protected]>. You actually
have to ask him :)
> Original-Author: Suresh Jayaraman <[email protected]>
> Ported-To-LTP:By: Manas K Nayak <[email protected]>
> ---
>
> --- ltp-full-20090331.orig/testcases/kernel/syscalls/splice/splice02.c
> 1970-01-01 05:30:00.000000000 +0530
> +++ ltp-full-20090331/testcases/kernel/syscalls/splice/splice02.c
> 2009-04-13 16:04:21.000000000 +0530
> @@ -0,0 +1,145 @@
> +/******************************************************************************/
> +/* Copyright (c) Suresh Jayaraman <[email protected]>, 2009
> */
> +/*
> */
> +/* LKML Reference: http://lkml.org/lkml/2009/4/2/55
> */
> +/*
> */
> +/* This program is free software; you can redistribute it and/or modify
> */
> +/* it under the terms of the GNU General Public License as published by
> */
> +/* the Free Software Foundation; either version 2 of the License, or
> */
> +/* (at your option) any later version.
> */
> +/*
> */
> +/* This program is distributed in the hope that it will be useful,
> */
> +/* but WITHOUT ANY WARRANTY; without even the implied warranty of
> */
> +/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
> */
> +/* the GNU General Public License for more details.
> */
> +/*
> */
> +/* You should have received a copy of the GNU General Public License
> */
> +/* along with this program; if not, write to the Free Software
> */
> +/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> */
> +/*
> */
> +/******************************************************************************/
> +/******************************************************************************/
> +/*
> */
> +/* File: splice02.c
> */
> +/*
> */
> +/* Description: This tests the splice() syscall
> */
> +/*
> */
> +/* Usage: <for command-line>
> */
> +/* echo "Test splice()" > <outfile>; splice02 <outfile>
> */
> +/*
> */
> +/* Total Tests: 1
> */
> +/*
> */
> +/* Test Name: splice02 */
> +/* History: Porting from Crackerjack to LTP is done by
> */
> +/* Manas Kumar Nayak [email protected]>
> */
> +/******************************************************************************/
> +#define _GNU_SOURCE
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +#include <fcntl.h>
> +
> +
> +/* Harness Specific Include Files. */
> +#include "test.h"
> +#include "usctest.h"
> +#include "linux_syscall_numbers.h"
> +
> +/* Extern Global Variables */
> +extern int Tst_count; /* counter for tst_xxx routines. */
> +extern char *TESTDIR; /* temporary dir created by tst_tmpdir() */
> +
> +/* Global Variables */
> +char *TCID = "splice02"; /* Test program identifier.*/
> +int testno;
> +int TST_TOTAL = 1; /* total number of tests in this file.
> */
> +
> +/* Extern Global Functions */
> +/******************************************************************************/
> +/*
> */
> +/* Function: cleanup
> */
> +/*
> */
> +/* Description: Performs all one time clean up for this test on successful
> */
> +/* completion, premature exit or failure. Closes all
> temporary */
> +/* files, removes all temporary directories exits the test with
> */
> +/* appropriate return code by calling tst_exit() function.
> */
> +/*
> */
> +/* Input: None.
> */
> +/*
> */
> +/* Output: None.
> */
> +/*
> */
> +/* Return: On failure - Exits calling tst_exit(). Non '0' return code.
> */
> +/* On success - Exits calling tst_exit(). With '0' return code.
> */
> +/*
> */
> +/******************************************************************************/
> +extern void cleanup() {
> + /* Remove tmp dir and all files in it */
> + TEST_CLEANUP;
> + tst_rmdir();
> +
> + /* Exit with appropriate return code. */
> + tst_exit();
> +}
> +
> +/* Local Functions */
> +/******************************************************************************/
> +/*
> */
> +/* Function: setup
> */
> +/*
> */
> +/* Description: Performs all one time setup for this test. This function is
> */
> +/* typically used to capture signals, create temporary dirs
> */
> +/* and temporary files that may be used in the course of this
> */
> +/* test.
> */
> +/*
> */
> +/* Input: None.
> */
> +/*
> */
> +/* Output: None.
> */
> +/*
> */
> +/* Return: On failure - Exits by calling cleanup().
> */
> +/* On success - returns 0.
> */
> +/*
> */
> +/******************************************************************************/
> +void setup() {
> + /* Capture signals if any */
> + /* Create temporary directories */
> + TEST_PAUSE;
> + tst_tmpdir();
> +}
> +
> +#define SPLICE_SIZE (64*1024)
> +
> +int main(int ac, char **av) {
> + int fd = 0;
> + int ret = 0;
> +
> + setup();
> +
> + if (ac < 2 ) {
> + tst_resm(TFAIL, "%s failed - Usage: %s outfile", TCID, av[0]);
> + tst_exit();
> + }
> + fd=open(av[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
> + if(fd < 0 ) {
> + tst_resm(TFAIL, "%s failed - errno = %d : %s", TCID, TEST_ERRNO,
> strerror(TEST_ERRNO));
> + cleanup();
> + tst_exit();
> + }
> +
> + do {
> + ret = splice(STDIN_FILENO, NULL, fd, NULL, SPLICE_SIZE, 0);
> + if (ret < 0) {
> + tst_resm(TFAIL, "%s failed - errno = %d : %s",TCID, TEST_ERRNO,
> strerror(TEST_ERRNO));
> + cleanup();
> + tst_exit();
> + } else
> + if (ret < SPLICE_SIZE){
> + cleanup();
> + tst_exit();
> + }
> + } while(1);
> +
> + close(fd);
> + tst_resm(TPASS, "splice() system call Passed");
> + tst_exit();
> +}
> +
> --- ltp-full-20090331.orig/runtest/syscalls 2009-04-13 15:12:15.000000000
> +0530
> +++ ltp-full-20090331/runtest/syscalls 2009-04-13 16:10:26.000000000
> +0530
> @@ -1030,6 +1030,8 @@ sockioctl01 sockioctl01
>
> #splice test
> splice01 splice01
> +splice02 echo "Test splice02()" > splice02-temp; splice02 splice02-temp
> +
> tee01 tee01
>
> stat01 stat01
>
> ---
> Regards--
> Manas
>
--
Suresh Jayaraman
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