On Mon, Mar 03, 2014 at 03:59:36PM -0800, Linus Torvalds wrote:
> I doubt it's worth caring about. Even when passing things in memory,
> the end result isn't that much worse than the fget_light() model that
> passes just one of the two fields in memory.
I'm not sure if that's the right approach, TBH. I wonder if something
like
static inline struct fd fdget(int fd)
{
unsigned long v = __fdget(fd);
return (struct fd){(struct file *)(v & ~1), v & 1};
}
would not be a better starting point, with __fdget(fd) being
{
struct files_struct *files = current->files;
struct file *file;
if (atomic_read(&files->count) == 1) {
file = __fcheck_files(files, fd);
if (file && (file->f_mode & FMODE_PATH))
return 0;
return (unsigned long)file;
} else {
file = __fget(fd, FMODE_PATH);
return file ? 1 | (unsigned long)file : 0;
}
}
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