From: David Howells <dhowells@redhat.com>
To: "J. Bruce Fields" <bfields@redhat.com>
Cc: dhowells@redhat.com, linux-nfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 10/10] nfsd: clients don't need to break their own delegations
Date: Tue, 20 Mar 2018 13:35:51 +0000 [thread overview]
Message-ID: <29167.1521552951@warthog.procyon.org.uk> (raw)
In-Reply-To: <1521470194-24840-11-git-send-email-bfields@redhat.com>
J. Bruce Fields <bfields@redhat.com> wrote:
> @@ -139,6 +139,9 @@ struct cred {
> struct key *thread_keyring; /* keyring private to this thread */
> struct key *request_key_auth; /* assumed request_key authority */
> #endif
> +#ifdef CONFIG_FILE_LOCKING
> + void *lease_breaker; /* identify NFS client breaking a delegation */
> +#endif
> #ifdef CONFIG_SECURITY
> void *security; /* subjective LSM security */
> #endif
Sorry, but ewww.
Two reasons for that comment:
(1) The cred struct may get retained long past where you expect if it gets
attached to another process or a file descriptor.
(2) The ->lease_breaker pointer needs lifetime management in cred.c. It will
potentially get copied around and may need cleaning up.
Can you stick your breaker identity in a key struct as Jeff suggested?
David
next prev parent reply other threads:[~2018-03-20 13:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-19 14:36 [PATCH 00/10] Eliminate delegation self-conflicts v2 J. Bruce Fields
2018-03-19 14:36 ` [PATCH 01/10] vfs: remove unnecessary fl_owner_t typedef J. Bruce Fields
2018-03-19 14:36 ` [PATCH 02/10] nfsd: simplify put of fi_deleg_file J. Bruce Fields
2018-03-19 14:36 ` [PATCH 03/10] nfsd: simplify nfs4_put_deleg_lease calls J. Bruce Fields
2018-03-19 14:36 ` [PATCH 04/10] nfsd4: set fl_owner to delegation, not file pointer J. Bruce Fields
2018-03-19 14:36 ` [PATCH 05/10] nfsd4: dp->dl_stid.sc_file doesn't need locking J. Bruce Fields
2018-03-19 14:36 ` [PATCH 06/10] nfsd: make nfs4_get_existing_delegation less confusing J. Bruce Fields
2018-03-19 14:36 ` [PATCH 07/10] nfsd: factor out common delegation-destruction code J. Bruce Fields
2018-03-19 14:36 ` [PATCH 08/10] nfsd: move sc_file assignment into alloc_init_deleg J. Bruce Fields
2018-03-19 14:36 ` [PATCH 09/10] nfsd: create a separate lease for each delegation J. Bruce Fields
2018-03-19 14:36 ` [PATCH 10/10] nfsd: clients don't need to break their own delegations J. Bruce Fields
2018-03-20 13:10 ` [PATCH 00/10] Eliminate delegation self-conflicts v2 Jeff Layton
2018-03-20 13:35 ` David Howells [this message]
2018-03-20 13:46 ` [PATCH 10/10] nfsd: clients don't need to break their own delegations Trond Myklebust
2018-03-20 14:49 ` J. Bruce Fields
2018-03-20 15:13 ` Trond Myklebust
2018-03-20 16:02 ` bfields
2018-09-06 19:40 ` bfields
2018-03-20 14:52 ` J. Bruce Fields
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