Re: [PATCH v6 1/8] fs: introduce kernel_pread_file* support

[Scott Branden]

Hi Matthew,

On 2020-06-05 8:20 p.m., Matthew Wilcox wrote:
> On Fri, Jun 05, 2020 at 03:59:52PM -0700, Scott Branden wrote:
> > -int kernel_read_file(struct file *file, void **buf, loff_t *size,
> > -		     loff_t max_size, enum kernel_read_file_id id)
> > -{
> > -	loff_t i_size, pos;
> > +int kernel_pread_file(struct file *file, void **buf, loff_t *size,
> > +		      loff_t pos, loff_t max_size,
> > +		      enum kernel_pread_opt opt,
> > +		      enum kernel_read_file_id id)
> What is this 'kernel_pread_opt' foolishness?  Why not just pass in
> ~0UL as max_size if you want the entire file?
That is not how existing kernel_read_file api works - max_size is specified.
I guess not everyone has unlimited memory to read a file on any size.
> > -int kernel_read_file_from_path_initns(const char *path, void **buf,
> > -				      loff_t *size, loff_t max_size,
> > -				      enum kernel_read_file_id id)
> > +extern int kernel_pread_file_from_path_initns(const char *path, void **buf,
> extern?  really?  i'm shocked gcc doesn't vomit on that.
A typo. thanks. You'll have to ask the compiler gods about your shock.