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Wed, 09 Sep 2026 03:22:13 -0400 X-MC-Unique: 9xl01ZGCMAK74ylbvMxq_g-1 X-Mimecast-MFC-AGG-ID: 9xl01ZGCMAK74ylbvMxq_g_1788938530 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id ADEA11954AE7; Wed, 9 Sep 2026 07:22:09 +0000 (UTC) Received: from warthog.com (unknown [10.44.32.158]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 77EAB195608C; Wed, 9 Sep 2026 07:22:03 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Paulo Alcantara , Matthew Wilcox , Namjae Jeon , Marc Dionne , Stefan Metzmacher , Eric Van Hensbergen , Dominique Martinet , Ilya Dryomov , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Trond Myklebust , Anna Schumaker , Alex Markuze , Viacheslav Dubeyko Subject: [PATCH v13 6/8] netfs: Make deprecated PG_private_2 support opt-in Date: Wed, 9 Sep 2026 08:21:00 +0100 Message-ID: <20260909072105.1663687-7-dhowells@redhat.com> In-Reply-To: <20260909072105.1663687-1-dhowells@redhat.com> References: <20260909072105.1663687-1-dhowells@redhat.com> X-Mailing-List: linux-erofs@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-MFC-PROC-ID: 6XxMVl9a5YvDj9RKUuQZmcRiTRDoQwgOz3Ufgh6FPmQ_1788938530 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Make the deprecated PG_private_2 support opt-in, requiring it to be selected by the filesystems that might want to use it. Signed-off-by: David Howells Reviewed-by: Paulo Alcantara cc: Trond Myklebust cc: Anna Schumaker cc: Ilya Dryomov cc: Alex Markuze cc: Viacheslav Dubeyko cc: netfs@lists.linux.dev cc: linux-nfs@vger.kernel.org cc: ceph-devel@vger.kernel.org cc: linux-fsdevel@vger.kernel.org --- fs/ceph/Kconfig | 1 + fs/netfs/Kconfig | 3 +++ fs/netfs/Makefile | 2 +- fs/netfs/buffered_read.c | 2 +- fs/netfs/internal.h | 28 ++++++++++++++++++++++++++++ fs/netfs/read_collect.c | 4 ++-- fs/nfs/Kconfig | 1 + include/linux/netfs.h | 2 ++ 8 files changed, 39 insertions(+), 4 deletions(-) diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig index 3d64a316ca31..aa6ccd7794d2 100644 --- a/fs/ceph/Kconfig +++ b/fs/ceph/Kconfig @@ -4,6 +4,7 @@ config CEPH_FS depends on INET select CEPH_LIB select NETFS_SUPPORT + select NETFS_PGPRIV2 select FS_ENCRYPTION_ALGS if FS_ENCRYPTION default n help diff --git a/fs/netfs/Kconfig b/fs/netfs/Kconfig index 7701c037c328..d0e7b0971fa3 100644 --- a/fs/netfs/Kconfig +++ b/fs/netfs/Kconfig @@ -22,6 +22,9 @@ config NETFS_STATS between CPUs. On the other hand, the stats are very useful for debugging purposes. Saying 'Y' here is recommended. +config NETFS_PGPRIV2 + bool + config NETFS_DEBUG bool "Enable dynamic debugging netfslib and FS-Cache" depends on NETFS_SUPPORT diff --git a/fs/netfs/Makefile b/fs/netfs/Makefile index b43188d64bd8..54834cde7e56 100644 --- a/fs/netfs/Makefile +++ b/fs/netfs/Makefile @@ -11,7 +11,6 @@ netfs-y := \ misc.o \ objects.o \ read_collect.o \ - read_pgpriv2.o \ read_retry.o \ read_single.o \ rolling_buffer.o \ @@ -19,6 +18,7 @@ netfs-y := \ write_issue.o \ write_retry.o +netfs-$(CONFIG_NETFS_PGPRIV2) += read_pgpriv2.o netfs-$(CONFIG_NETFS_STATS) += stats.o netfs-$(CONFIG_FSCACHE) += \ diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index 61cf82b4b60d..54287a8ef0f8 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -242,7 +242,7 @@ static void netfs_mark_copy_to_cache(struct netfs_io_request *rreq, if (overlap > 0 && copy) { folio = folioq_folio(*fq, *slot); - if (unlikely(test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags))) { + if (netfs_using_pgpriv2(rreq)) { if (!folio_test_private_2(folio)) folio_start_private_2(folio); } else { diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index a4c834e32214..3aebe4a4f7b0 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -120,9 +120,37 @@ void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error); /* * read_pgpriv2.c */ +#ifdef CONFIG_NETFS_PGPRIV2 +int netfs_prepare_pgpriv2_write_buffer(struct netfs_io_subrequest *subreq, + unsigned int max_segs); void netfs_pgpriv2_copy_to_cache(struct netfs_io_request *rreq, struct folio *folio); void netfs_pgpriv2_end_copy_to_cache(struct netfs_io_request *rreq); bool netfs_pgpriv2_unlock_copied_folios(struct netfs_io_request *wreq); +static inline bool netfs_using_pgpriv2(const struct netfs_io_request *rreq) +{ + return unlikely(test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags)); +} +#else +static inline int netfs_prepare_pgpriv2_write_buffer(struct netfs_io_subrequest *subreq, + unsigned int max_segs) +{ + return -EIO; +} +static inline void netfs_pgpriv2_copy_to_cache(struct netfs_io_request *rreq, struct folio *folio) +{ +} +static inline void netfs_pgpriv2_end_copy_to_cache(struct netfs_io_request *rreq) +{ +} +static inline bool netfs_pgpriv2_unlock_copied_folios(struct netfs_io_request *wreq) +{ + return true; +} +static inline bool netfs_using_pgpriv2(const struct netfs_io_request *rreq) +{ + return false; +} +#endif /* * read_retry.c diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c index 61f2664de6d3..01ea1ddae04b 100644 --- a/fs/netfs/read_collect.c +++ b/fs/netfs/read_collect.c @@ -38,7 +38,7 @@ static void netfs_clear_unread(struct netfs_io_subrequest *subreq) */ void netfs_cancel_copy_to_cache(struct netfs_io_request *rreq, struct folio *folio) { - if (!test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags)) { + if (!netfs_using_pgpriv2(rreq)) { if (folio_get_private(folio) == NETFS_FOLIO_COPY_TO_CACHE) { folio_detach_private(folio); trace_netfs_folio(folio, netfs_folio_trace_cancel_copy); @@ -81,7 +81,7 @@ static void netfs_unlock_read_folio(struct netfs_io_request *rreq, if (unlikely(test_bit(NETFS_RREQ_CANCEL_CACHING, &rreq->flags))) netfs_cancel_copy_to_cache(rreq, folio); - if (!test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags)) { + if (!netfs_using_pgpriv2(rreq)) { if (netfs_folio_group(folio) == NETFS_FOLIO_COPY_TO_CACHE) { trace_netfs_folio(folio, netfs_folio_trace_sched_copy); folio_mark_dirty(folio); diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig index 6bb30543eff0..e7862f35b72c 100644 --- a/fs/nfs/Kconfig +++ b/fs/nfs/Kconfig @@ -174,6 +174,7 @@ config NFS_FSCACHE bool "Provide NFS client caching support" depends on NFS_FS select NETFS_SUPPORT + select NETFS_PGPRIV2 select FSCACHE help Say Y here if you want NFS data to be cached locally on disc through diff --git a/include/linux/netfs.h b/include/linux/netfs.h index f2b3e61c1891..71fdd6ef43a7 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -279,8 +279,10 @@ struct netfs_io_request { #define NETFS_RREQ_UPLOAD_TO_SERVER 11 /* Need to write to the server */ #define NETFS_RREQ_USE_IO_ITER 12 /* Use ->io_iter rather than ->i_pages */ #define NETFS_RREQ_NEED_PUT_RA_REFS 17 /* Need to put the folio refs RA gave us */ +#ifdef CONFIG_NETFS_PGPRIV2 #define NETFS_RREQ_USE_PGPRIV2 31 /* [DEPRECATED] Use PG_private_2 to mark * write to cache on read */ +#endif const struct netfs_request_ops *netfs_ops; };