r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000001ac0)='/proc/diskstats\x00', 0x0, 0x0)
preadv2(r0, &(0x7f00000006c0)=[{&(0x7f0000000580)=""/35, 0x23}], 0x1, 0x0, 0x0, 0x8)