linux-kernel - Re: [PATCH 01/26] cifs: Fix duplicate fscache cookie warnings

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Date: Mon, 15 Apr 2024 14:03:54 +0100
From: David Howells <dhowells@...hat.com>
To: Jeff Layton <jlayton@...nel.org>
Cc: dhowells@...hat.com, Christian Brauner <christian@...uner.io>,
    Gao Xiang <hsiangkao@...ux.alibaba.com>,
    Dominique Martinet <asmadeus@...ewreck.org>,
    Matthew Wilcox <willy@...radead.org>,
    Steve French <smfrench@...il.com>,
    Marc Dionne <marc.dionne@...istor.com>,
    Paulo Alcantara <pc@...guebit.com>,
    Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>,
    Eric Van Hensbergen <ericvh@...nel.org>,
    Ilya Dryomov <idryomov@...il.com>, netfs@...ts.linux.dev,
    linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
    linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
    ceph-devel@...r.kernel.org, v9fs@...ts.linux.dev,
    linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
    linux-mm@...ck.org, netdev@...r.kernel.org,
    linux-kernel@...r.kernel.org, Steve French <sfrench@...ba.org>,
    Shyam Prasad N <nspmangalore@...il.com>,
    Rohith Surabattula <rohiths.msft@...il.com>
Subject: Re: [PATCH 01/26] cifs: Fix duplicate fscache cookie warnings

Jeff Layton <jlayton@...nel.org> wrote:

> > +struct cifs_fscache_inode_key {
> > +
> > +	__le64  uniqueid;	/* server inode number */
> > +	__le64  createtime;	/* creation time on server */
> > +	u8	type;		/* S_IFMT file type */
> > +} __packed;
> > +
> 
> Interesting. So the uniqueid of the inode is not unique within the fs?
> Or are the clients are mounting shares that span multiple filesystems?
> Or, are we looking at a situation where the uniqueid is being quickly
> reused for new inodes after the original inode is unlinked?

The problem is that it's not unique over time.  creat(); unlink(); creat();
may yield a repeat of the uniqueid.  It's like i_ino in that respect.

David