[PATCH v2] mtd: cmdlinepart: fix the wrong partitions number when truncating occurs

[Shmulik Ladkani]

Hi,

On Sat, 25 Aug 2012 05:26:51 -0400 Huang Shijie <shijie8 at gmail.com> wrote:
> On Sat, Aug 25, 2012 at 5:02 AM, Shmulik Ladkani
> <shmulik.ladkani at gmail.com> wrote:
> > Your analysis seems right, but let me offer an alternative approach.
> >
> > I would simply:
> >
> > -                                       part->num_parts = i;
> your code does not wors in such kernel command line(also with the 1GB
> nand chip):
> #gpmi-nand:100m(root),100m(kernel),1g(rootfs),1g(user),-(rest)
> 

Can you please detail what do you mean by "not work"?

To my understanding, in this example, according to my suggestion, the
resulting partitions would be:

root	100m at 0
kernel	100m at 100m
rootfs	800m at 200m (truncated)
user	0 at 1g (truncated)
rest	0 at 1g

Reasonable IMO, given the fact that the mtd device size is smaller than
the specified parts.

I saw you submitted a patch which sorts the cmdline parts; I don't
understand why this is necessary.
Also, sorting might not be desirable, as the user specified the unsorted
partitions might have _wanted_ them to appear in that order.

Now lets focus on your original suggestion and its consequences:

- Orignal code STOPPED parsing at the 1st truncated partition,
  this partition WAS NOT returned to the caller
- Your patch STOPS AFTER parsing the 1st truncated partition,
  this partiton IS returned to the caller (but partitions specified
  later are no longer parsed)
- My suggestion CONTINUES parsing all partitions.
  So later partitions (specified with the 'size' but *without* 'offset')
  will be truncated AND presented to the caller.
  AND, if later partitions are specified using the 'size at offset'
  explicit format, they are parsed normally.
  
Regards,
Shmulik