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    SubjectRe: [PATCH] VM: Fix the gfp_mask in invalidate_complete_page2
    Trond Myklebust wrote:
    > If try_to_release_page() is called with a zero gfp mask, then the
    > filesystem is effectively denied the possibility of sleeping while
    > attempting to release the page. There doesn't appear to be any valid
    > reason why this should be banned, given that we're not calling this from
    > a memory allocation context.
    >
    > For this reason, change the gfp_mask argument of the call to GFP_KERNEL.
    >
    > Note: I am less sure of what the callers of invalidate_complete_page()
    > require, and so this patch does not touch that mask.
    >
    > Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    > ---
    > diff --git a/mm/truncate.c b/mm/truncate.c
    > index f4edbc1..49c1ffd 100644
    > --- a/mm/truncate.c
    > +++ b/mm/truncate.c
    > @@ -302,7 +302,7 @@ invalidate_complete_page2(struct address
    > if (page->mapping != mapping)
    > return 0;
    >
    > - if (PagePrivate(page) && !try_to_release_page(page, 0))
    > + if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))
    > return 0;
    >
    > write_lock_irq(&mapping->tree_lock);
    Well I was using mapping_gfp_mask(mapping) as the argument to
    try_to_release_page() which also worked... but isn't this
    just plugging one of many holes? Meaning try_to_release_page is called
    from a number of places with a zero gfp_mask so shouldn't those
    also be fixed as well OR removed the gfp_mask as an argument as the
    comment at the top of try_to_release_page() alludes to?

    steved.

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