Re: [PATCH v2] fs: introduce is_dot_dotdot helper for cleanup

[Matthew Wilcox]

On Tue, Dec 03, 2019 at 08:56:50PM +0800, Tiezhu Yang wrote:
> There exists many similar and duplicate codes to check "." and "..",
> so introduce is_dot_dotdot helper to make the code more clean.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
> ---
> 
> v2:
>   - use the better performance implementation of is_dot_dotdot
>   - make it static inline and move it to include/linux/fs.h

Ugh, not more crap in fs.h.

$ ls -l --sort=size include/linux |head
-rw-r--r--  1 willy willy 154148 Nov 29 22:35 netdevice.h
-rw-r--r--  1 willy willy 130488 Nov 29 22:35 skbuff.h
-rw-r--r--  1 willy willy 123540 Nov 29 22:35 pci_ids.h
-rw-r--r--  1 willy willy 118991 Nov 29 22:35 fs.h

I think this probably fits well in namei.h.  And I think it works
better with bare 'name' and 'len' arguments, rather than taking a qstr.

And, as I asked twice in the last round of review, did you benchmark
this change?