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From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org, idryomov@gmail.com, dhowells@redhat.com
Cc: willy@infradead.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-cachefs@redhat.com
Subject: [PATCH 2/6] ceph: rework PageFsCache handling
Date: Tue, 26 Jan 2021 08:40:59 -0500
Message-ID: <20210126134103.240031-3-jlayton@kernel.org> (raw)
In-Reply-To: <20210126134103.240031-1-jlayton@kernel.org>

With the new fscache API, the PageFsCache bit now indicates that the
page is being written to the cache and shouldn't be modified or released
until it's finished.

Change releasepage and invalidatepage to wait on that bit before
returning.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/addr.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 2b17bb36e548..fbfa49db06fd 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -146,6 +146,8 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
 	struct ceph_inode_info *ci;
 	struct ceph_snap_context *snapc = page_snap_context(page);
 
+	wait_on_page_fscache(page);
+
 	inode = page->mapping->host;
 	ci = ceph_inode(inode);
 
@@ -168,11 +170,16 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
 	ClearPagePrivate(page);
 }
 
-static int ceph_releasepage(struct page *page, gfp_t g)
+static int ceph_releasepage(struct page *page, gfp_t gfp_flags)
 {
 	dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
 	     page, page->index, PageDirty(page) ? "" : "not ");
 
+	if (PageFsCache(page)) {
+		if (!(gfp_flags & __GFP_DIRECT_RECLAIM) || !(gfp_flags & __GFP_FS))
+			return 0;
+		wait_on_page_fscache(page);
+	}
 	return !PagePrivate(page);
 }
 
-- 
2.29.2


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-26 13:40 [PATCH 0/6] ceph: convert to new netfs read helpers Jeff Layton
2021-01-26 13:40 ` [PATCH 1/6] ceph: disable old fscache readpage handling Jeff Layton
2021-01-26 13:40 ` Jeff Layton [this message]
2021-01-26 13:41 ` [PATCH 3/6] ceph: fix fscache invalidation Jeff Layton
2021-01-26 13:41 ` [PATCH 4/6] ceph: convert readpage to fscache read helper Jeff Layton
2021-01-26 13:41 ` [PATCH 5/6] ceph: plug write_begin into " Jeff Layton
2021-01-26 13:41 ` [PATCH 6/6] ceph: convert ceph_readpages to ceph_readahead Jeff Layton
2021-01-27 22:50 ` [PATCH 0/6] ceph: convert to new netfs read helpers Ilya Dryomov
2021-01-28 12:52   ` Jeff Layton
2021-01-28 20:48     ` Ilya Dryomov
2021-02-01 15:25     ` David Howells

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