From: David Howells <dhowells@redhat.com>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Jeff Layton <jlayton@kernel.org>,
Dominique Martinet <asmadeus@codewreck.org>,
kafs-testing@auristor.com, dhowells@redhat.com,
Jeff Layton <jlayton@kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
Dominique Martinet <asmadeus@codewreck.org>,
linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com,
v9fs-developer@lists.sourceforge.net,
linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org,
linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org,
devel@lists.orangefs.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v5 1/4] folio: Add a function to change the private data attached to a folio
Date: Wed, 10 Nov 2021 21:08:05 +0000 [thread overview]
Message-ID: <163657848531.834781.14269656212269187893.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <163657847613.834781.7923681076643317435.stgit@warthog.procyon.org.uk>
Add a function, folio_change_private(), that will change the private data
attached to a folio, without the need to twiddle the private bit or the
refcount. It assumes that folio_add_private() has already been called on
the page.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Dominique Martinet <asmadeus@codewreck.org>
Tested-by: kafs-testing@auristor.com
Link: https://lore.kernel.org/r/162981149911.1901565.17776700811659843340.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/163005743485.2472992.5100702469503007023.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163584180781.4023316.5037526301198034310.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/163649324326.309189.17817587229450840783.stgit@warthog.procyon.org.uk/ # v4
---
include/linux/pagemap.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 6a30916b76e5..1f560aecd9b5 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -279,6 +279,25 @@ static inline void folio_attach_private(struct folio *folio, void *data)
folio_set_private(folio);
}
+/**
+ * folio_change_private - Change private data on a folio.
+ * @folio: Folio to change the data on.
+ * @data: Data to set on the folio.
+ *
+ * Change the private data attached to a folio and return the old
+ * data. The page must previously have had data attached and the data
+ * must be detached before the folio will be freed.
+ *
+ * Return: Data that was previously attached to the folio.
+ */
+static inline void *folio_change_private(struct folio *folio, void *data)
+{
+ void *old = folio_get_private(folio);
+
+ folio->private = data;
+ return old;
+}
+
/**
* folio_detach_private - Detach private data from a folio.
* @folio: Folio to detach data from.
next prev parent reply other threads:[~2021-11-10 21:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-10 21:07 [PATCH v5 0/4] netfs, 9p, afs, ceph: Support folios, at least partially David Howells
2021-11-10 21:08 ` David Howells [this message]
2021-11-10 21:08 ` [PATCH v5 2/4] folio: Add a function to get the host inode for a folio David Howells
2021-11-10 21:08 ` [PATCH v5 3/4] netfs, 9p, afs, ceph: Use folios David Howells
2021-11-10 21:09 ` [PATCH v5 4/4] afs: Use folios in directory handling David Howells
2021-11-11 14:28 ` [PATCH v5 0/4] netfs, 9p, afs, ceph: Support folios, at least partially Dominique Martinet
[not found] ` <MDAEMON-F202111101609.AA0938215md5001000000902@sequoia-grove.ad.secure-endpoints.com>
2021-11-11 15:45 ` [kafs-testing] [PATCH v5 4/4] afs: Use folios in directory handling Jeffrey E Altman
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