Re: [f2fs-dev] possible to allocate a full segment for a direct IO with blocksize 2MB?

[Jaegeuk Kim <jaegeuk@kernel.org>]

On 07/10, lampahome wrote:
> >
> > 1. fd = create()
> > 2. ioctl(fd, F2FS_IOC_SET_PIN_FILE)
> > 3. fallocate(1GB)
> >  -> will allocate 2MB segments to the 1GB space
> >
> >
> I tried but it shows ioctl failed: Bad address.

Hmm, can I ask which kernel you're using?

Thanks,

> 
> Code below:
> #define _GNU_SOURCE
> #include <stdlib.h>
> #include <stdio.h>
> #include <sys/ioctl.h>
> #include <fcntl.h>
> #include <unistd.h>
> #include <string.h>
> #include <sys/param.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <stdint.h>
> 
> typedef uint32_t __u32;
> 
> #define F2FS_IOCTL_MAGIC                0xf5
> #define F2FS_IOC_SET_PIN_FILE           _IOW(F2FS_IOCTL_MAGIC, 13, __u32)
> 
> int main() {
>  char prefix[] = "/mnt/f2fsdir/";
>  char path[5][10] = {"ggg1","ggg2","ggg3","ggg4","ggg5"};
>  int i, num=1, ret;
>  int fd;
>  FILE *fp;
>  off_t off = 0;
>  off_t size = 512;
>  char buf[256];
>  mode_t mode = S_IWUSR | S_IWGRP | S_IWOTH | S_IRUSR | S_IRGRP | S_IROTH;
> 
> 
>  for (int j=0;j<num;j++) {
>   memset(buf, 0, sizeof(buf));
>   snprintf(buf, sizeof(buf), "%s%s", prefix, path[j]);
>   fd = creat(buf, mode);
>   if (fd < 0)
>    perror("open fd failed");
> 
>   ret = ioctl(fd, F2FS_IOC_SET_PIN_FILE);
>   if (ret < 0)
>    perror("ioctl failed");
> 
>   if (fallocate(fd, 0, off, size)<0)
>    perror("could not allocate");
> 
>   close(fd);
>  }
> 
>  return 0;
> }


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