linux-kernel - [PATCH 4.18 84/88] ext4, dax: add ext4_bmap to ext4_dax

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Date:   Thu, 27 Sep 2018 11:04:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Toshi Kani <toshi.kani@....com>,
        Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>
Subject: [PATCH 4.18 84/88] ext4, dax: add ext4_bmap to ext4_dax_aops

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

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

From: Toshi Kani <toshi.kani@....com>

commit 94dbb63117e82253c9592816aa4465f0a9c94850 upstream.

Ext4 mount path calls .bmap to the journal inode. This currently
works for the DAX mount case because ext4_iget() always set
'ext4_da_aops' to any regular files.

In preparation to fix ext4_iget() to set 'ext4_dax_aops' for ext4
DAX files, add ext4_bmap() to 'ext4_dax_aops', since bmap works for
DAX inodes.

Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops")
Signed-off-by: Toshi Kani <toshi.kani@....com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Suggested-by: Jan Kara <jack@...e.cz>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/inode.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3951,6 +3951,7 @@ static const struct address_space_operat
 	.writepages		= ext4_dax_writepages,
 	.direct_IO		= noop_direct_IO,
 	.set_page_dirty		= noop_set_page_dirty,
+	.bmap			= ext4_bmap,
 	.invalidatepage		= noop_invalidatepage,
 };