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From: David Howells <dhowells@redhat.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <sfrench@samba.org>,
	Dominique Martinet <asmadeus@codewreck.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Matthew Wilcox <willy@infradead.org>,
	linux-mm@kvack.org, linux-cachefs@redhat.com,
	linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org,
	linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org,
	v9fs-developer@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, dhowells@redhat.com,
	Jeff Layton <jlayton@redhat.com>,
	David Wysochanski <dwysocha@redhat.com>,
	"Matthew Wilcox (Oracle)" <willy@infradead.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-cachefs@redhat.com, linux-afs@lists.infradead.org,
	linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
	ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v5 08/28] netfs, mm: Add set/end/wait_on_page_fscache() aliases
Date: Tue, 23 Mar 2021 22:18:58 +0000	[thread overview]
Message-ID: <161653793873.2770958.12157243390965814502.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <161653784755.2770958.11820491619308713741.stgit@warthog.procyon.org.uk>

Add set/end/wait_on_page_fscache() as aliases of
set/end/wait_page_private_2().  These allow a page to marked with
PG_fscache, the flag to be removed and waiters woken and waiting for the
flag to be cleared.  A ref on the page is also taken and dropped.

[Linus suggested putting the fscache-themed functions into the
 caching-specific headers rather than pagemap.h[1]]

Changes:
v5:
- Mirror the changes to the core routines[2].

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Linus Torvalds <torvalds@linux-foundation.org>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-mm@kvack.org
cc: linux-cachefs@redhat.com
cc: linux-afs@lists.infradead.org
cc: linux-nfs@vger.kernel.org
cc: linux-cifs@vger.kernel.org
cc: ceph-devel@vger.kernel.org
cc: v9fs-developer@lists.sourceforge.net
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/1330473.1612974547@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/CAHk-=wjgA-74ddehziVk=XAEMTKswPu1Yw4uaro1R3ibs27ztw@mail.gmail.com/ [1]
Link: https://lore.kernel.org/r/161340393568.1303470.4997526899111310530.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539536093.286939.5076448803512118764.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/2499407.1616505440@warthog.procyon.org.uk/ [2]
---

 include/linux/netfs.h |   57 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index cc1102040488..8479d63406f7 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -26,4 +26,61 @@
 #define TestSetPageFsCache(page)	TestSetPagePrivate2((page))
 #define TestClearPageFsCache(page)	TestClearPagePrivate2((page))
 
+/**
+ * set_page_fscache - Set PG_fscache on a page and take a ref
+ * @page: The page.
+ *
+ * Set the PG_fscache (PG_private_2) flag on a page and take the reference
+ * needed for the VM to handle its lifetime correctly.  This sets the flag and
+ * takes the reference unconditionally, so care must be taken not to set the
+ * flag again if it's already set.
+ */
+static inline void set_page_fscache(struct page *page)
+{
+	set_page_private_2(page);
+}
+
+/**
+ * end_page_fscache - Clear PG_fscache and release any waiters
+ * @page: The page
+ *
+ * Clear the PG_fscache (PG_private_2) bit on a page and wake up any sleepers
+ * waiting for this.  The page ref held for PG_private_2 being set is released.
+ *
+ * This is, for example, used when a netfs page is being written to a local
+ * disk cache, thereby allowing writes to the cache for the same page to be
+ * serialised.
+ */
+static inline void end_page_fscache(struct page *page)
+{
+	end_page_private_2(page);
+}
+
+/**
+ * wait_on_page_fscache - Wait for PG_fscache to be cleared on a page
+ * @page: The page to wait on
+ *
+ * Wait for PG_fscache (aka PG_private_2) to be cleared on a page.
+ */
+static inline void wait_on_page_fscache(struct page *page)
+{
+	wait_on_page_private_2(page);
+}
+
+/**
+ * wait_on_page_fscache_killable - Wait for PG_fscache to be cleared on a page
+ * @page: The page to wait on
+ *
+ * Wait for PG_fscache (aka PG_private_2) to be cleared on a page or until a
+ * fatal signal is received by the calling task.
+ *
+ * Return:
+ * - 0 if successful.
+ * - -EINTR if a fatal signal was encountered.
+ */
+static inline int wait_on_page_fscache_killable(struct page *page)
+{
+	return wait_on_page_private_2_killable(page);
+}
+
 #endif /* _LINUX_NETFS_H */



  parent reply	other threads:[~2021-03-23 22:21 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 22:17 [PATCH v5 00/28] Network fs helper library & fscache kiocb API David Howells
2021-03-23 22:17 ` [PATCH v5 01/28] iov_iter: Add ITER_XARRAY David Howells
2021-03-23 22:17 ` [PATCH v5 02/28] mm: Add wait_on_page_writeback_killable() David Howells
2021-03-23 22:18 ` [PATCH v5 03/28] mm: Add set/end/wait functions for PG_private_2 David Howells
2021-03-23 22:18 ` [PATCH v5 04/28] mm: Implement readahead_control pageset expansion David Howells
2021-03-23 22:18 ` [PATCH v5 05/28] netfs: Make a netfs helper module David Howells
2021-03-23 22:18 ` [PATCH v5 06/28] netfs: Documentation for helper library David Howells
2021-03-23 22:18 ` [PATCH v5 07/28] netfs, mm: Move PG_fscache helper funcs to linux/netfs.h David Howells
2021-03-23 22:18 ` David Howells [this message]
2021-03-23 22:19 ` [PATCH v5 09/28] netfs: Provide readahead and readpage netfs helpers David Howells
2021-03-23 22:19 ` [PATCH v5 10/28] netfs: Add tracepoints David Howells
2021-03-23 22:19 ` [PATCH v5 11/28] netfs: Gather stats David Howells
2021-03-23 22:19 ` [PATCH v5 12/28] netfs: Add write_begin helper David Howells
2021-03-23 22:19 ` [PATCH v5 13/28] netfs: Define an interface to talk to a cache David Howells
2021-03-23 22:20 ` [PATCH v5 14/28] fscache, cachefiles: Add alternate API to use kiocb for read/write to cache David Howells
2021-03-23 22:20 ` [PATCH v5 15/28] afs: Disable use of the fscache I/O routines David Howells
2021-03-23 22:20 ` [PATCH v5 16/28] afs: Pass page into dirty region helpers to provide THP size David Howells
2021-03-23 22:20 ` [PATCH v5 17/28] afs: Print the operation debug_id when logging an unexpected data version David Howells
2021-03-23 22:21 ` [PATCH v5 18/28] afs: Move key to afs_read struct David Howells
2021-03-23 22:21 ` [PATCH v5 19/28] afs: Don't truncate iter during data fetch David Howells
2021-03-23 22:21 ` [PATCH v5 20/28] afs: Log remote unmarshalling errors David Howells
2021-03-23 22:21 ` [PATCH v5 21/28] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2021-03-23 22:21 ` [PATCH v5 22/28] afs: Use ITER_XARRAY for writing David Howells
2021-03-23 22:22 ` [PATCH v5 23/28] afs: Wait on PG_fscache before modifying/releasing a page David Howells
2021-03-23 22:22 ` [PATCH v5 24/28] afs: Extract writeback extension into its own function David Howells
2021-03-23 22:22 ` [PATCH v5 25/28] afs: Prepare for use of THPs David Howells
2021-03-23 22:22 ` [PATCH v5 26/28] afs: Use the fs operation ops to handle FetchData completion David Howells
2021-03-23 22:22 ` [PATCH v5 27/28] afs: Use new fscache read helper API David Howells
2021-03-23 22:23 ` [PATCH v5 28/28] afs: Use the fscache_write_begin() helper David Howells

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