r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000080)='/proc/diskstats\x00', 0x0, 0x0)
preadv(r0, &(0x7f00000011c0)=[{&(0x7f00000000c0)=""/231, 0xe7}], 0x1, 0x80, 0x0)