linux-kernel - [PATCH AUTOSEL 4.19 175/252] NFS: Revalidate the file size on a fatal write error

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Date:   Fri, 14 Feb 2020 11:10:30 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Trond Myklebust <trondmy@...il.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Sasha Levin <sashal@...nel.org>, linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 175/252] NFS: Revalidate the file size on a fatal write error

From: Trond Myklebust <trondmy@...il.com>

[ Upstream commit 0df68ced55443243951d02cc497be31fadf28173 ]

If we suffer a fatal error upon writing a file, which causes us to
need to revalidate the entire mapping, then we should also revalidate
the file size.

Fixes: d2ceb7e57086 ("NFS: Don't use page_file_mapping after removing the page")
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/write.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index e27637fa0f790..e8152781814dd 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -240,7 +240,15 @@ static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int c
 /* A writeback failed: mark the page as bad, and invalidate the page cache */
 static void nfs_set_pageerror(struct address_space *mapping)
 {
+	struct inode *inode = mapping->host;
+
 	nfs_zap_mapping(mapping->host, mapping);
+	/* Force file size revalidation */
+	spin_lock(&inode->i_lock);
+	NFS_I(inode)->cache_validity |= NFS_INO_REVAL_FORCED |
+					NFS_INO_REVAL_PAGECACHE |
+					NFS_INO_INVALID_SIZE;
+	spin_unlock(&inode->i_lock);
 }
 
 /*
-- 
2.20.1