linux-kernel - [PATCH 4.12 151/196] NFS: Fix initialization of nfs_page

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Date:   Tue, 25 Jul 2017 12:22:30 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Benjamin Coddington <bcodding@...hat.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>
Subject: [PATCH 4.12 151/196] NFS: Fix initialization of nfs_page_array->npages

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin Coddington <bcodding@...hat.com>

commit 2eb3aea7d9c43325a12df312adfc7fb25bbd636b upstream.

Commit 8ef9b0b9e1c0 open-coded nfs_pgarray_set(), and left out the
initialization of the nfs_page_array's npages.  This mistake didn't show up
until testing with block layouts, and there shows that all pNFS reads
return -EIO.

Fixes: 8ef9b0b9e1c0 ("NFS: move nfs_pgarray_set() to open code")
Signed-off-by: Benjamin Coddington <bcodding@...hat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/pagelist.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -779,6 +779,7 @@ int nfs_generic_pgio(struct nfs_pageio_d
 	gfp_t gfp_flags = GFP_KERNEL;
 
 	pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
+	pg_array->npages = pagecount;
 
 	if (pagecount <= ARRAY_SIZE(pg_array->page_array))
 		pg_array->pagevec = pg_array->page_array;