linux-kernel - [PATCH v2 1/3] ext4, dax: add ext4_bmap to ext4_dax

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Message-Id: <20180914145114.11122-2-toshi.kani@hpe.com>
Date:   Fri, 14 Sep 2018 08:51:12 -0600
From:   Toshi Kani <toshi.kani@....com>
To:     jack@...e.cz, dan.j.williams@...el.com
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@....com>,
        stable@...r.kernel.org
Subject: [PATCH v2 1/3] ext4, dax: add ext4_bmap to ext4_dax_aops

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'. .bmap works for
DAX inodes. [1]

[1]: https://lkml.org/lkml/2018/9/12/803
Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops")
Signed-off-by: Toshi Kani <toshi.kani@....com>
Suggested-by: Jan Kara <jack@...e.cz>
Cc: Jan Kara <jack@...e.cz>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Cc: <stable@...r.kernel.org>
---
 fs/ext4/inode.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d0dd585add6a..e4acaa980467 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3948,6 +3948,7 @@ static const struct address_space_operations ext4_dax_aops = {
 	.writepages		= ext4_dax_writepages,
 	.direct_IO		= noop_direct_IO,
 	.set_page_dirty		= noop_set_page_dirty,
+	.bmap			= ext4_bmap,
 	.invalidatepage		= noop_invalidatepage,
 };