fs/ext4: Narrow scope of DAX check in setflags

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.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20200528150003.828793-2-ira.weiny@intel.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index bfc1281fc4cbcbecca95cc2582690a02eb22e70f..5813e5e73eab6dc5e408b22c8ef319812a14476e 100644 (file)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -393,9 +393,9 @@ flags_err:
        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;
                }