linux-ext4 - [PATCH v4 13/18] ext4: use DEFINE_FSDAX

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Date:   Sat, 23 Dec 2017 16:57:10 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     jack@...e.cz, linux-nvdimm@...ts.01.org, linux-xfs@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-fsdevel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        ross.zwisler@...ux.intel.com, linux-ext4@...r.kernel.org,
        hch@....de
Subject: [PATCH v4 13/18] ext4: use DEFINE_FSDAX_AOPS

In preparation for the dax implementation to start associating dax pages
to inodes via page->mapping, we need to provide a 'struct
address_space_operations' instance for dax. Otherwise, direct-I/O
triggers incorrect page cache assumptions and warnings.

Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Cc: linux-ext4@...r.kernel.org
Cc: Jan Kara <jack@...e.cz>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 fs/ext4/inode.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7df2c5644e59..065d11f43cb3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3928,6 +3928,8 @@ static const struct address_space_operations ext4_da_aops = {
 	.error_remove_page	= generic_error_remove_page,
 };
 
+static DEFINE_FSDAX_AOPS(ext4_dax_aops, ext4_writepages);
+
 void ext4_set_aops(struct inode *inode)
 {
 	switch (ext4_inode_journal_mode(inode)) {
@@ -3940,7 +3942,9 @@ void ext4_set_aops(struct inode *inode)
 	default:
 		BUG();
 	}
-	if (test_opt(inode->i_sb, DELALLOC))
+	if (IS_DAX(inode))
+		inode->i_mapping->a_ops = &ext4_dax_aops;
+	else if (test_opt(inode->i_sb, DELALLOC))
 		inode->i_mapping->a_ops = &ext4_da_aops;
 	else
 		inode->i_mapping->a_ops = &ext4_aops;