Dear CentOS,
I have recently upgraded several servers from CentOS4 to CentOS5 and I am noticing a strange change to the stat() call. I have written a very small program to test and show the behavior. I am calling stat() against a file which is exported from my NAS and mounted with 32k read/write sizes.
[dougalb@centos4 tmp]$ cat my_stat.c #include <unistd.h> #include <stdio.h> #include <sys/stat.h> #include <sys/types.h>
int main(int argc, char **argv) { if(argc != 2) return 1;
struct stat fileStat; if(stat(argv[1],&fileStat) < 0) return 1;
printf("Block size: \t\t%d\n",fileStat.st_blksize);
return 0; }
[dougalb@centos4 tmp]$ [dougalb@centos4 tmp]$ gcc -o my_stat.exe my_stat.c [dougalb@centos4 tmp]$ [dougalb@centos4 tmp]$ ./my_stat.exe /mnt/nas/testfile Block size: 32768 [dougalb@centos4 tmp]$ [dougalb@centos4 tmp]$ cat /etc/redhat-release CentOS release 4.7 (Final) [dougalb@centos4 tmp]$
[dougalb@centos5 tmp]$ ./my_stat.exe /mnt/nas/testfile Block size: 4096 [dougalb@centos5 tmp]$ [dougalb@centos5 tmp]$ cat /etc/redhat-release CentOS release 5.5 (Final) [dougalb@centos5 tmp]$
On CentOS5 it is reporting 4k block sizes when it should report 32k. Has anyone seen this or aware of what is causing this change in behavior?
Kind regards,
Dougal