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    SubjectRe: [PATCH] rd: Use a private inode for backing storage
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    Am Sonntag, 21. Oktober 2007 schrieb Eric W. Biederman:
    > Nick. Reread the patch. The only thing your arguments have
    > established for me is that this patch is not obviously correct. Which
    > makes it ineligible for a back port. Frankly I suspect the whole
    > issue is to subtle and rare to make any backport make any sense. My
    > apologies Christian.

    About being rare, when I force the VM to be more aggressive reclaiming buffer
    by using the following patch:
    --- linux-2.6.orig/fs/buffer.c
    +++ linux-2.6/fs/buffer.c
    @@ -3225,7 +3225,7 @@ void __init buffer_init(void)
    * Limit the bh occupancy to 10% of ZONE_NORMAL
    */
    nrpages = (nr_free_buffer_pages() * 10) / 100;
    - max_buffer_heads = nrpages * (PAGE_SIZE / sizeof(struct buffer_head));
    + max_buffer_heads = 0;
    hotcpu_notifier(buffer_cpu_notify, 0);
    }

    I can actually cause data corruption within some seconds. So I think the
    problem is real enough to be worth fixing.
    I still dont fully understand what issues you have with my patch.
    - it obviously fixes the problem
    - I am not aware of any regression it introduces
    - its small

    One concern you had, was the fact that buffer heads are out of sync with
    struct pages. Testing your first patch revealed that this is actually needed
    by reiserfs - and maybe others.
    I can also see, that my patch looks a bit like a bandaid that cobbles the rd
    pieces together.
    Is there anything else, that makes my patch unmergeable in your opinion?


    Christian






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