linux-ext4 - [PATCH v2 3/3] ext2, dax: set ext2_dax

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Date:   Fri, 14 Sep 2018 08:51:14 -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 3/3] ext2, dax: set ext2_dax_aops for dax files

Sync syscall to DAX file needs to flush processor cache, but it
currently does not flush to existing DAX files.  This is because
'ext2_da_aops' is set to address_space_operations of existing DAX
files, instead of 'ext2_dax_aops', since S_DAX flag is set after
ext2_set_aops() in the open path.

Similar to ext4, change ext2_iget() to initialize i_flags before
ext2_set_aops().

Fixes: fb094c90748f ("ext2, dax: introduce ext2_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/ext2/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 7f7ee18fe179..e4bb9386c045 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1448,6 +1448,7 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
 	}
 	inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
 	ei->i_flags = le32_to_cpu(raw_inode->i_flags);
+	ext2_set_inode_flags(inode);
 	ei->i_faddr = le32_to_cpu(raw_inode->i_faddr);
 	ei->i_frag_no = raw_inode->i_frag;
 	ei->i_frag_size = raw_inode->i_fsize;
@@ -1517,7 +1518,6 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
 			   new_decode_dev(le32_to_cpu(raw_inode->i_block[1])));
 	}
 	brelse (bh);
-	ext2_set_inode_flags(inode);
 	unlock_new_inode(inode);
 	return inode;