linux-kernel - [PATCH 11/14] iomap: warn on inline maps in iomap_writepage

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Message-Id: <20191017175624.30305-12-hch@lst.de>
Date:   Thu, 17 Oct 2019 19:56:21 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Darrick J . Wong" <darrick.wong@...cle.com>
Cc:     Damien Le Moal <Damien.LeMoal@....com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dave Chinner <dchinner@...hat.com>
Subject: [PATCH 11/14] iomap: warn on inline maps in iomap_writepage_map

And inline mapping should never mark the page dirty and thus never end up
in writepages.  Add a check for that condition and warn if it happens.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/iomap/buffered-io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index a8db706d59cb..7b83a7ba2edb 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1415,6 +1415,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
 		error = wpc->ops->map_blocks(wpc, inode, file_offset);
 		if (error)
 			break;
+		if (WARN_ON_ONCE(wpc->iomap.type == IOMAP_INLINE))
+			continue;
 		if (wpc->iomap.type == IOMAP_HOLE)
 			continue;
 		iomap_add_to_ioend(inode, file_offset, page, iop, wpc, wbc,
-- 
2.20.1