Re: [Virtio-fs] [PATCH] virtiofsd: update FUSE_FORGET comment on "lo_inode.nlookup"

[Dr. David Alan Gilbert]

* Vivek Goyal (vgoyal@redhat.com) wrote:
> On Tue, Dec 08, 2020 at 08:39:36AM +0100, Laszlo Ersek wrote:
> > Miklos confirms it's *only* the FUSE_FORGET request that the client can
> > use for decrementing "lo_inode.nlookup".
> > 
> > Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> > Cc: Miklos Szeredi <mszeredi@redhat.com>
> > Cc: Stefan Hajnoczi <stefanha@redhat.com>
> > Fixes: 1222f015558fc34cea02aa3a5a92de608c82cec8
> > Signed-off-by: Laszlo Ersek <lersek@redhat.com>
> 
> Looks correct. unref_inode() calls in lo_rmdir() lo_rename() are dropping
> ->nlookup they have taken internally during the function execution.
> 
> Reviewed-by: Vivek Goyal <vgoyal@redhat.com>

Queued.

> 
> Thanks
> Vivek
> 
> > ---
> >  tools/virtiofsd/passthrough_ll.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/virtiofsd/passthrough_ll.c 
> > b/tools/virtiofsd/passthrough_ll.c
> > index 06543b20dcbb..d3be680e92c3 100644
> > --- a/tools/virtiofsd/passthrough_ll.c
> > +++ b/tools/virtiofsd/passthrough_ll.c
> > @@ -113,7 +113,7 @@ struct lo_inode {
> >       * This counter keeps the inode alive during the FUSE session.
> >       * Incremented when the FUSE inode number is sent in a reply
> >       * (FUSE_LOOKUP, FUSE_READDIRPLUS, etc).  Decremented when an inode is
> > -     * released by requests like FUSE_FORGET, FUSE_RMDIR, FUSE_RENAME, etc.
> > +     * released by a FUSE_FORGET request.
> >       *
> >       * Note that this value is untrusted because the client can manipulate
> >       * it arbitrarily using FUSE_FORGET requests.
> > -- 
> > 2.19.1.3.g30247aa5d201
> > 
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-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK