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Date:   Wed, 11 Dec 2019 11:50:52 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Cc:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "tytso@....edu" <tytso@....edu>,
        "adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "osandov@...com" <osandov@...com>,
        "jthumshirn@...e.de" <jthumshirn@...e.de>,
        "minwoo.im.dev@...il.com" <minwoo.im.dev@...il.com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "andrea.parri@...rulasolutions.com" 
        <andrea.parri@...rulasolutions.com>,
        "hare@...e.com" <hare@...e.com>, "tj@...nel.org" <tj@...nel.org>,
        Ajay Joshi <Ajay.Joshi@....com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "dsterba@...e.com" <dsterba@...e.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "asml.silence@...il.com" <asml.silence@...il.com>
Subject: Re: [PATCH RFC 0/3] block,ext4: Introduce REQ_OP_ASSIGN_RANGE to
 reflect extents allocation in block device internals

On 11.12.2019 10:42, Chaitanya Kulkarni wrote:
>> Here is a simple test I did:
>> https://gist.github.com/tkhai/5b788651cdb74c1dbff3500745878856
>>
> 
> Somehow I'm not able to open this link, can you please share results
> in plain text on the email ?

#define _GNU_SOURCE
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

#define BLOCK_SIZE 4096
#define STEP (BLOCK_SIZE * 16)
#define SIZE (4ULL * 1024 * 1024 * 1024)

int main(int argc)
{
	int fd, step, ret = 0;
	unsigned long i;
	void *buf;

	if (posix_memalign(&buf, BLOCK_SIZE, SIZE)) {
		perror("alloc");
		exit(1);
	}

	fd = open("file2.img", O_RDWR|O_CREAT|O_DIRECT);
	if (fd < 0) {
		perror("open");
		exit(1);
	}

	if (ftruncate(fd, SIZE)) {
		perror("ftruncate");
		exit(1);
	}

	ret = fallocate(fd, 0, 0, SIZE);
	if (ret) {
		perror("fallocate");
		exit(1);
	}
	
	for (step = STEP - BLOCK_SIZE; step >= 0; step -= BLOCK_SIZE) {
		printf("step=%u\n", step);
		for (i = step; i < SIZE; i += STEP) {
			errno = 0;
			if (pwrite(fd, buf, BLOCK_SIZE, i) != BLOCK_SIZE) {
				perror("pwrite");
				exit(1);
			}
		}

		if (fsync(fd)) {
			perror("fsync");
			exit(1);
		}
	}

	return 0;
}


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