Re: test13-pre5

[Marcelo Tosatti]

On Thu, 28 Dec 2000, Linus Torvalds wrote:

>  - make "SetPageDirty()" do something like
> 
>       if (!test_and_set(PG_dirty, &page->flags)) {
>               spin_lock(&page_cache_lock);
>               list_del(page->list);
>               list_add(page->list, page->mapping->dirty_pages);
>               spin_unlock(&page_cache_lock);
>       }
> 
>    This will require making sure that every place that does a
>    SetPageDirty() will be ok with this (ie double-check that they all have
>    a mapping: right now the free_pte() code in mm/memory.c doesn't care,
>    because it knew that it coul dmark even anonymous pages dirty and
>    they'd just get ignored.
>  - make a filemap_fdatasync() that walks the dirty pages and does a
>    writepage() on them all and moves them to the clean list.

We also want to move the page to the per-address-space clean list in
ClearPageDirty I suppose.

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