On 2010-08-12, at 14:15, Joel Becker wrote:
> On Thu, Aug 12, 2010 at 12:45:41PM -0600, Andreas Dilger wrote:
>> On 2010-08-12, at 11:42, Joel Becker wrote:
>>>> +int generic_check_addressable(unsigned blocksize_bits, u64 num_blocks)
>>>> +{
>>>> + u64 last_fs_block = num_blocks - 1;
>>>> +
>>>> + BUG_ON(blocksize_bits < 9);
>>>> + BUG_ON(blocksize_bits > PAGE_CACHE_SHIFT);
>>
>> I'd rather not have a BUG_ON() for a "check" function that may be called
>> with on-disk values by some filesystem. Some filesystems (AFAIR) also
>> handle blocksize > PAGE_SIZE internally, so this helper would not be useful
>> for them.
>
> Filesystems that handle their own page cache certainly wouldn't
> be interested in a generic helper anyway. All of our pagecache assumes
> blocks between 512<->PAGE_CACHE_SIZE.
> If I change the BUG_ON()s to -EINVAL, does that work? Or do you
> have some way you'd like to allow non-pagecache filesystems to use this
> as well?
That's probably fine for now. If anyone complains, we can always change it
later, since they can't possibly depend on this function yet...
Cheers, Andreas
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