On Sun, Oct 14, 2018 at 10:21:31AM -0700, Christoph Hellwig wrote:
> > +/* Update inode timestamps and remove security privileges when remapping.
> > */
> > +int generic_remap_file_range_touch(struct file *file, bool is_dedupe)
> > +{
> > + int ret;
> > +
> > + /* If can't alter the file contents, we're done. */
> > + if (is_dedupe)
> > + return 0;
> > +
> > + /* Update the timestamps, since we can alter file contents. */
> > + if (!(file->f_mode & FMODE_NOCMTIME)) {
> > + ret = file_update_time(file);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + /*
> > + * Clear the security bits if the process is not being run by root.
> > + * This keeps people from modifying setuid and setgid binaries.
> > + */
> > + return file_remove_privs(file);
> > +}
> > +EXPORT_SYMBOL(generic_remap_file_range_touch);
>
> The name seems a little out of touch with what it actually does.
I originally thought "touch" because it updates [cm]time. :)
Though looking at the final code, I think this can just be called from
the end of generic_remap_file_range_prep, so we can skip the export and
all that other stuff.
> Also why a bool argument instead of the more descriptive flags which
> introduced a few patches ago?
Hmm, yes, the remap_flags transition can move up to before this patch.
--D
