[PATCH] erofs: enable dax for chunk based regular file

[Xin Yin]

DAX can be used to share page cache between VMs, reducing guest memory
overhead. And chunk based data format is widely used for VM and
container image. So enable dax support for it, make erofs better used
for VM scenarios.

Signed-off-by: Xin Yin <yinxin.x at bytedance.com>
---
 fs/erofs/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index d70b12b81507..e12592727a54 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -183,7 +183,8 @@ static void *erofs_read_inode(struct erofs_buf *buf,
 
 	inode->i_flags &= ~S_DAX;
 	if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
-	    vi->datalayout == EROFS_INODE_FLAT_PLAIN)
+	    (vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
+	     vi->datalayout == EROFS_INODE_CHUNK_BASED))
 		inode->i_flags |= S_DAX;
 
 	if (!nblks)
-- 
2.25.1