linux-ext4 - [PATCH 1/6] ext2: Return BH_New buffers for zeroed blocks

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Message-Id: <1479980796-26161-2-git-send-email-jack@suse.cz>
Date:   Thu, 24 Nov 2016 10:46:31 +0100
From:   Jan Kara <jack@...e.cz>
To:     <linux-fsdevel@...r.kernel.org>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        <linux-ext4@...r.kernel.org>, <linux-mm@...ck.org>,
        linux-nvdimm@...ts.01.org, Johannes Weiner <hannes@...xchg.org>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH 1/6] ext2: Return BH_New buffers for zeroed blocks

So far we did not return BH_New buffers from ext2_get_blocks() when we
allocated and zeroed-out a block for DAX inode to avoid racy zeroing in
DAX code. This zeroing is gone these days so we can remove the
workaround.

Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext2/inode.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 046b642f3585..e626fe892c01 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -754,9 +754,8 @@ static int ext2_get_blocks(struct inode *inode,
 			mutex_unlock(&ei->truncate_mutex);
 			goto cleanup;
 		}
-	} else {
-		*new = true;
 	}
+	*new = true;
 
 	ext2_splice_branch(inode, iblock, partial, indirect_blks, count);
 	mutex_unlock(&ei->truncate_mutex);
-- 
2.6.6

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