Re: Block device cache issue

[Avi Kivity <avi@redhat.com>]

Andrew Morton wrote:
>
>> should it perhaps be the case that the partition's buffers somehow be 
>> linked with those of the containing device, or even be part of them? I 
>> don't even know if this is possible without significant overhead in the 
>> page cache (of which my understanding is very shallow), but keep in mind 
>> that this behaviour almost led to filesystem corruption (luckily we only 
>> changed a single file and hit a single inode).
>>     
>
> It would incur overhead.  We could perhaps fix it by having a single
> cache for /dev/sda and then just making /dev/sda1 access that cache
> with an offset.

The offset can be non PAGE_SIZE aligned (and usually isn't, 63 sectors 
difference with normal partitioning).

-- 
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