Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

Greg Kroah-Hartman
2020-03-03T13:14:39Z

On Tue, Mar 03, 2020 at 02:03:47PM +0100, Greg Kroah-Hartman wrote:
> On Tue, Mar 03, 2020 at 12:38:14PM +0100, Karel Zak wrote:
> > On Tue, Mar 03, 2020 at 10:26:21AM +0100, Miklos Szeredi wrote:
> > > No, I don't think this is going to be a performance issue at all, but
> > > if anything we could introduce a syscall
> > >
> > > ssize_t readfile(int dfd, const char *path, char *buf, size_t
> > > bufsize, int flags);
> >
> > off-topic, but I'll buy you many many beers if you implement it ;-),
> > because open + read + close is pretty common for /sys and /proc in
> > many userspace tools; for example ps, top, lsblk, lsmem, lsns, udevd
> > etc. is all about it.
>
> Unlimited beers for a 21-line kernel patch? Sign me up!
>
> Totally untested, barely compiled patch below.

Ok, that didn't even build, let me try this for real now...