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Preparation: for the two-checkpoint rule we will flush all pages which have block->rec_lsn <= last_checkpoint_lsn. Pages with rec_lsn not yet set (i.e. ==0) were dirtied very recently and so should not be flushed (otherwise it's not efficient: we should try to let a page be modified several times in memory before we flush it to disk). To make this easy, "block->rec_lsn not yet set" is now expressed with block->rec_lsn==LSN_MAX, not block->rec_lsn==0 anymore. It is easier this way because LSN_MAX>last_checkpoint_lsn whereas 0<=last_checkpoint_lsn. storage/maria/ma_blockrec.c: typo storage/maria/ma_loghandler.c: typo storage/maria/ma_loghandler_lsn.h: LSN_MAX storage/maria/ma_pagecache.c: "block->rec_lsn not yet set" is now expressed by block->rec_lsn==LSN_MAX, not block_rec_lsn==0. |
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