raid0 and buffers larger than PAGE_SIZE

[Chip Salzenberg <chip@valinux.com>]

I'm using raid0 under 2.2.16pre4 and I've just started observing a new
failure mode that's completely preventing it from working: getblk(),
and therefore refill_freelist(), is being called with a size greater
than PAGE_SIZE.  This is triggered by e2fsck on the /dev/md0, and it's
probably been a while since the last e2fsck, so I don't know when the
was actually introduced.

I'm using an Intel CPU, so PAGE_SIZE is 4K, but getblk() is being
called with a size of 16K, which is (not coincidentally) my raid0
chunk size.  It ends up in an infinite loop, as getblk() calls
refill_freelist() forever until it succeeds, which it never does!

I'm not sure whether the bug is in raid0 (is setting a block device
block size greater than PAGE_SIZE legal?), refill_freelist (is
creating buffer heads that span multiple pages legal?), or something
else entirely....  Help?!

Clues, anyone?
-- 
Chip Salzenberg              - a.k.a. -              <chip@valinux.com>
"I wanted to play hopscotch with the impenetrable mystery of existence,
    but he stepped in a wormhole and had to go in early."  // MST3K
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