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(). A highmem page can have buffers??? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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