r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/partitions\x00', 0x0, 0x0)
preadv(r0, &(0x7f0000000580)=[{&(0x7f00000000c0)=""/229, 0xe5}], 0x1, 0x1, 0x0)