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From:   Dave Wysochanski <dwysocha@redhat.com>
To:     Trond Myklebust <trond.myklebust@hammerspace.com>,
        Anna Schumaker <anna.schumaker@netapp.com>
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH v3] NFS: Fix fscache read from NFS after cache error
Date:   Tue, 29 Jun 2021 13:13:57 -0400
Message-Id: <1624986837-17880-1-git-send-email-dwysocha@redhat.com>
Precedence: bulk

Earlier commits refactored some NFS read code and removed
nfs_readpage_async(), but neglected to properly fixup
nfs_readpage_from_fscache_complete().  The code path is
only hit when something unusual occurs with the cachefiles
backing filesystem, such as an IO error or while a cookie
is being invalidated.

Mark page with PG_checked if fscache IO completes in error,
unlock the page, and let the VM decide to re-issue based on
PG_uptodate.  When the VM reissues the readpage, PG_checked
allows us to skip over fscache and read from the server.

Link: https://marc.info/?l=linux-nfs&m=162498209518739
Fixes: 1e83b173b266 ("NFS: Add nfs_pageio_complete_read() and remove nfs_readpage_async()")
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
---
 fs/nfs/fscache.c | 18 +++++++++++++-----
 fs/nfs/read.c    |  5 +++--
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index c4c021c6ebbd..d743629e05e1 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -385,12 +385,15 @@ static void nfs_readpage_from_fscache_complete(struct page *page,
 		 "NFS: readpage_from_fscache_complete (0x%p/0x%p/%d)\n",
 		 page, context, error);
 
-	/* if the read completes with an error, we just unlock the page and let
-	 * the VM reissue the readpage */
-	if (!error) {
+	/*
+	 * If the read completes with an error, mark the page with PG_checked,
+	 * unlock the page, and let the VM reissue the readpage.
+	 */
+	if (!error)
 		SetPageUptodate(page);
-		unlock_page(page);
-	}
+	else
+		SetPageChecked(page);
+	unlock_page(page);
 }
 
 /*
@@ -405,6 +408,11 @@ int __nfs_readpage_from_fscache(struct nfs_open_context *ctx,
 		 "NFS: readpage_from_fscache(fsc:%p/p:%p(i:%lx f:%lx)/0x%p)\n",
 		 nfs_i_fscache(inode), page, page->index, page->flags, inode);
 
+	if (PageChecked(page)) {
+		ClearPageChecked(page);
+		return 1;
+	}
+
 	ret = fscache_read_or_alloc_page(nfs_i_fscache(inode),
 					 page,
 					 nfs_readpage_from_fscache_complete,
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index eb390eb618b3..9f39e0a1a38b 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -362,13 +362,13 @@ int nfs_readpage(struct file *file, struct page *page)
 	} else
 		desc.ctx = get_nfs_open_context(nfs_file_open_context(file));
 
+	xchg(&desc.ctx->error, 0);
 	if (!IS_SYNC(inode)) {
 		ret = nfs_readpage_from_fscache(desc.ctx, inode, page);
 		if (ret == 0)
-			goto out;
+			goto out_wait;
 	}
 
-	xchg(&desc.ctx->error, 0);
 	nfs_pageio_init_read(&desc.pgio, inode, false,
 			     &nfs_async_read_completion_ops);
 
@@ -378,6 +378,7 @@ int nfs_readpage(struct file *file, struct page *page)
 
 	nfs_pageio_complete_read(&desc.pgio);
 	ret = desc.pgio.pg_error < 0 ? desc.pgio.pg_error : 0;
+out_wait:
 	if (!ret) {
 		ret = wait_on_page_locked_killable(page);
 		if (!PageUptodate(page) && !ret)
-- 
1.8.3.1