On Wednesday 29 September 2010 21:21:14 Roland Dreier wrote:
>
> > The main difference between default_llseek and generic_file_llseek
> > is that default_llseek doesn't care about the maximum file size
> > of the underlying file system, which is ULONG_MAX on debugfs,
> > so they are equivalent.
>
> I thought default_llseek also takes the BKL still?
Not any more in linux-next.
> > In general, the preferred one is no_llseek for those files where
> > you know you do not need to seek. If you do, I'd use default_llseek
> > for character devices and generic_file_llseek for file systems
> > that set the s_maxbytes.
>
> The case in question is for debugfs files, so we should use
> generic_file_llseek, right?
Yes, but it's a very weak "should". My automatic conversion script
uses default_llseek.
Arnd
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