Messages in this thread | | | Date | Tue, 24 Apr 2007 12:59:17 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: Pagecache: find_or_create_page does not call a proper page allocator function |
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On Tue, 24 Apr 2007, Andrew Morton wrote:
> No, think of the following scenario: > > - file I/O causes a read of an ext2 file's bitmap. The bitmap is > brought into /dev/hda1's pagecache using !__GFP_HIGHMEM > > - references are released against that page and it's now just clean > reclaimable pagecache > > - someone (say, an online filesystem checker or something) mmaps > /dev/hda1 and reads that page. > > - migration comes alnog and migrates that page into highmem > > - file I/O causes a read of that bitmap again. We find it in > /dev/hda's pagecache.
Read of the bitmap? How would that work? Page cache lookup right?
> Here's set_bh_page().
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