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SubjectRe: [PATCH RFC 0/3] block,ext4: Introduce REQ_OP_ASSIGN_RANGE to reflect extents allocation in block device internals
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Date
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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