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[PATCH] dax: dirty inode only if required

To: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: [PATCH] dax: dirty inode only if required
From: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Date: Thu, 04 Feb 2016 17:02:02 +0300
Cc: "linux-kernel\@vger.kernel.org" <linux-kernel@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Theodore Ts'o <tytso@xxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Jan Kara <jack@xxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, linux-ext4 <linux-ext4@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Linux MM <linux-mm@xxxxxxxxx>, "linux-nvdimm\@lists.01.org" <linux-nvdimm@xxxxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, XFS Developers <xfs@xxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
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Sender: Dmitry Monakhov <rjevskiy@xxxxxxxxx>
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Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
---
 fs/dax.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index e0e9358..fc2e314 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -358,7 +358,8 @@ static int dax_radix_entry(struct address_space *mapping, 
pgoff_t index,
        void *entry;
 
        WARN_ON_ONCE(pmd_entry && !dirty);
-       __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+       if (dirty)
+               __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
 
        spin_lock_irq(&mapping->tree_lock);
 
-- 
1.8.3.1

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