linux-kernel - [PATCH RFC 1/8] fs/ext4: Narrow scope of DAX check in setflags

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Message-Id: <20200414040030.1802884-2-ira.weiny@intel.com>
Date:   Mon, 13 Apr 2020 21:00:23 -0700
From:   ira.weiny@...el.com
To:     linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jeff Moyer <jmoyer@...hat.com>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH RFC 1/8] fs/ext4: Narrow scope of DAX check in setflags

From: Ira Weiny <ira.weiny@...el.com>

When preventing DAX and journaling on an inode.  Use the effective DAX
check rather than the mount option.

This will be required to support per inode DAX flags.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/ext4/ioctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index a0ec750018dd..ee3401a32e79 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -405,9 +405,9 @@ static int ext4_ioctl_setflags(struct inode *inode,
 	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 		/*
 		 * Changes to the journaling mode can cause unsafe changes to
-		 * S_DAX if we are using the DAX mount option.
+		 * S_DAX if the inode is DAX
 		 */
-		if (test_opt(inode->i_sb, DAX)) {
+		if (IS_DAX(inode)) {
 			err = -EBUSY;
 			goto flags_out;
 		}
-- 
2.25.1