impossible mission

1. The mission is defined like this:
----------filesize----------------
[global]
directory=./temp
nrfiles=2
rw=randread
filesize=32k
size=96k
thread
[filesize]
description="Filesize less than size."
----------------------------------

This job file caused another non-stop thread, which was asked to read
96K but only provided two files of 32K each. The running information
kept looking like this:
---------------------------------
nonggia_at_nonggia-desktop:~/fio$ fio --version
fio 1.16.9
nonggia_at_nonggia-desktop:~/fio$ fio filesize
filesize: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
Starting 1 thread
Jobs: 1 (f=2): [r] [66.7% done] [ 0/ 0 kb/s] [eta 00m:51s]
---------------------------------

2. The reason:
After having covered both the two files, the thread still had 32K to
issued, while there were already no available files on hand.
I agree that it is far from a bug.Maybe it was the job file that we
should blame. It was wrong written from the beginning.But why not make
it more gentle if we can?

3. Fix suggestion:
So what about change it like this?
Just limit the max td->o.size with the total_size that all the files can
provide.
---------------------------------
diff -Nraup fio-7.25/filesetup.c fio-7.25-filesize/filesetup.c
--- fio-7.25/filesetup.c 2007-07-25 14:25:05.000000000 +0800
+++ fio-7.25-filesize/filesetup.c 2007-07-27 14:17:39.000000000 +0800
@@ -414,7 +414,7 @@ int setup_files(struct thread_data *td)
}
}

- if (!td->o.size)
+ if (!td->o.size || td->o.size > total_size)
td->o.size = total_size;

/*
---------------------------------

Now it behaves like this, just finishes as much job as it can and comes
to the end:
---------------------------------
nonggia_at_nonggia-desktop:~/fio$ ./filesize_fio filesize
filesize: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
Starting 1 thread

filesize: (groupid=0, jobs=1): err= 0: pid=8045
  Description : ["Filesize less than size."]
  read : io=64KiB, bw=32768KiB/s, iops=8000, runt= 2msec
    clat (usec): min= 72, max= 907, avg=167.56, stdev=210.90
  cpu : usr=0.00%, sys=0.00%, ctx=1
  IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
     issued r/w: total=16/0, short=0/0
     lat (usec): 100=62.50%, 250=25.00%, 500=6.25%, 1000=6.25%

Run status group 0 (all jobs):
   READ: io=64KiB, aggrb=32768KiB/s, minb=32768KiB/s, maxb=32768KiB/s,
mint=2msec, maxt=2msec

Disk stats (read/write):
  sda: ios=16/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%
nonggia_at_nonggia-desktop:~/fio$
---------------------------------