From 60263d5889e6dc5987dc51b801be4955ff2e4aa7 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 23 Jul 2020 22:45:59 -0700
Subject: iomap: fall back to buffered writes for invalidation failures

Failing to invalid the page cache means data in incoherent, which is
a very bad state for the system.  Always fall back to buffered I/O
through the page cache if we can't invalidate mappings.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Theodore Ts'o <tytso@mit.edu> # for ext4
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com> # for gfs2
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
 fs/gfs2/file.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'fs/gfs2')

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index fe305e4bfd37..b8929e470b9f 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -814,7 +814,8 @@ static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
 
 	ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
 			   is_sync_kiocb(iocb));
-
+	if (ret == -ENOTBLK)
+		ret = 0;
 out:
 	gfs2_glock_dq(&gh);
 out_uninit:
-- 
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