Shaggy,
Would you mind removing the comment first and please send me a list of
cleanup if you want. I am busy helping out other kernel areas but I
will try to help out here as well :).
Nick
On 2014-12-29 05:13 PM, Dave Kleikamp wrote:
> On 12/27/2014 06:58 PM, nick wrote:
>> Greetings Dave,
>> I am wondering why there is a TO DO above this code:
>> * ToDo: tlocks should be on doubly-linked list, so we can
>> * quickly remove it and add it to the end.
>
> I'm sure the idea was to avoid the for loop needed to find the previous
> entry in the linked list. A doubly-linked list makes it much simpler to
> remove an item from an arbitrary position in the list.
>
>> */
>>
>> /*
>> * Move parent page's tlock to the end of the tid's tlock list
>> */
>> if (log && mp->lid && (tblk->last != mp->lid) &&
>> lid_to_tlock(mp->lid)->tid) {
>> lid_t lid = mp->lid;
>> struct tlock *prev;
>>
>> tlck = lid_to_tlock(lid);
>>
>> if (tblk->next == lid)
>> tblk->next = tlck->next;
>> else {
>> for (prev = lid_to_tlock(tblk->next);
>> prev->next != lid;
>> prev = lid_to_tlock(prev->next)) {
>> assert(prev->next);
>> }
>> prev->next = tlck->next;
>> }
>> lid_to_tlock(tblk->last)->next = lid;
>> tlck->next = 0;
>> tblk->last = lid;
>> }
>> As this code clearly moves the locks onto a linked list. Therefore I am
>> recommend we remove this
>> TO DO as this is clearly misleading and no longer needed.
>
> That comment has been in the code forever and I don't have any intention
> of changing things, but I don't think it's wrong. I don't mind removing
> it, though. jfs has been barely maintained and there is a ton of cleanup
> that can be done if someone were willing to take the time to do it.
>
> Thanks,
> Shaggy
>
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