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    SubjectRe: ramdisk corruption problems - was: RE: pivot_root and initrd kern el panic woes

    On Fri, 21 Dec 2001, Alexander Viro wrote:
    > On Thu, 20 Dec 2001, Linus Torvalds wrote:
    > >
    > > On Thu, 20 Dec 2001, Alexander Viro wrote:
    > > >
    > > > AFAICS, it's nastier than that. What's to stop buffer_heads to be
    > > > freed under memory pressure?
    > >
    > > They'll be dirty if they are modified, and if they aren't modified they
    > > are zero.
    > >
    > > In the first case they won't be free'd, in the second care we don't care.
    > > So we're ok.
    > Umm... _Page_ will be dirty, all right. buffer_heads are cleaned when
    > you submit IO and I don't see anything that would mark them dirty again...

    But the "submit IO" will _mark_ the page dirty and uptodate, so once it is
    so marked, it should never be overwritten.

    Now, as I already sent out to Andrea, I think out actual IO routines look
    suspiciously complex and bogus.


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