2011/5/5 Teodor Sigaev <teo...@sigaev.ru>
>
> See several lines above:
>            if (parent->blkno == InvalidBlockNumber)
>
>                /*
>                 * end of chain and still didn't found parent, It's
> very-very
>                 * rare situation when root splited
>                 */
>                break;


As I understood it's because we can't move root to another page.

----
With best regards,
Alexander Korotkov.

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