From: Ira Weiny <ira.weiny@xxxxxxxxx> Change the logic of ext4_should_use_dax() to support using the inode dax flag OR the overriding tri-state mount option. While we are at it change the function to ext4_enable_dax() as this better reflects the ask. Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> --- fs/ext4/inode.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index fa0ff78dc033..e9d582e516bc 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4383,9 +4383,11 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); } -static bool ext4_should_use_dax(struct inode *inode) +static bool ext4_enable_dax(struct inode *inode) { - if (!test_opt(inode->i_sb, DAX)) + unsigned int flags = EXT4_I(inode)->i_flags; + + if (test_opt2(inode->i_sb, NODAX)) return false; if (!S_ISREG(inode->i_mode)) return false; @@ -4397,7 +4399,13 @@ static bool ext4_should_use_dax(struct inode *inode) return false; if (ext4_test_inode_flag(inode, EXT4_INODE_VERITY)) return false; - return true; + if (!bdev_dax_supported(inode->i_sb->s_bdev, + inode->i_sb->s_blocksize)) + return false; + if (test_opt(inode->i_sb, DAX)) + return true; + + return (flags & EXT4_DAX_FL) == EXT4_DAX_FL; } void ext4_set_inode_flags(struct inode *inode) @@ -4415,7 +4423,7 @@ void ext4_set_inode_flags(struct inode *inode) new_fl |= S_NOATIME; if (flags & EXT4_DIRSYNC_FL) new_fl |= S_DIRSYNC; - if (ext4_should_use_dax(inode)) + if (ext4_enable_dax(inode)) new_fl |= S_DAX; if (flags & EXT4_ENCRYPT_FL) new_fl |= S_ENCRYPTED; -- 2.25.1