On Thu, 20 Dec 2001, Linus Torvalds wrote:
> The problem is that having buffers doesn't necessarily always mean that
> they are valid, nor that _all_ of them are valid.
>
> Also, if the ramdisk "readpage" code is wrong, then so is the
> "prepare_write" code. They share the same logic, which basically says
> that "if the page isn't up-to-date, then it is zero". Which is always
> true for normal read/write accesses, but as you found out it's not true
> when parts of the page have been accessed by filesystems through the
> buffers.
AFAICS, it's nastier than that. What's to stop buffer_heads to be
freed under memory pressure?
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This archive was generated by hypermail 2b29 : Sun Dec 23 2001 - 21:00:23 EST