[OpenWrt-Devel] Squashfs breakage lottery with UBI WAS: [PATCH RFC 2/2] amp821xx: use newly added pad-squashfs for Meraki MR24

[Russell Senior]

>> Fwiw, I took a little closer look at the squashfs code. I still don't
>> quite understand it, but I sprinkled some printk()'s and got a better
>> idea of what is happening.
>> 
>> With a root.squashfs of 6428672 bytes, we get the error in a call:
>
> Actually, the 6428672 bytes was from a later trial. Sorry for the
> confusion. I'm not sure what the real root.squashfs size was
> anymore. Gah. I'll need to redo it.

Here are the corresponding numbers from the retry:

root.squasfs size (from the sysupgrade.bin tarball): 6427978 bytes

squashfs_read_data(sb=(ptrval),index=0,length=6427970,next_index=16777224,output=(null))
b=0; bytes=-322; length=8; cur_index=0

>> 
>>   squashfs_read_data(sb=(ptrval),index=0,length=6427986,next_index=16777224,output=  (null))
>> 
>> it enters the loop at fs/squashfs/block.c:122 with b=0; bytes=-338; length=8; cur_index=0
>> 
>>     for (b = 0; bytes < length; b++, cur_index++) {
>>         bh[b] = sb_getblk(sb, cur_index);
>>         if (bh[b] == NULL)
>>             goto block_release;
>> 
>> sb_getblk() must return NULL, because it goes to block_release and falls
>> through to print the error message and exits with an error.


-- 
Russell Senior, President
russell at personaltelco.net

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-- 
Russell Senior, President
russell at personaltelco.net

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