Re: [PATCH] ceph: avoid 32-bit page index overflow

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On Tue, Oct 02, 2012 at 10:28:24AM -0500, Alex Elder wrote:
> A pgoff_t is defined (by default) to have type (unsigned long).  On
> architectures such as i686 that's a 32-bit type.  The ceph address
> space code was attempting to produce 64 bit offsets by shifting a
> page's index by PAGE_CACHE_SHIFT, but the result was not what was
> desired because the shift occurred before the result got promoted
> to 64 bits.
> 
> Fix this by casting all uses of page->index used in this way to
> the desired 64-bit type.

It would be cleaner if you'd use the page_offset helper, which was
added to fix this problem without having to remember the right casts
everywhere.
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