[PATCH] erofs: add "noinline_data" extended option

[Gao Xiang]

In order to add preliminary DAX feature support.

Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
---
 include/erofs/config.h | 1 +
 lib/inode.c            | 5 +++++
 mkfs/main.c            | 6 ++++++
 3 files changed, 12 insertions(+)

diff --git a/include/erofs/config.h b/include/erofs/config.h
index 67e7a0fed24c..8124f3b36baf 100644
--- a/include/erofs/config.h
+++ b/include/erofs/config.h
@@ -44,6 +44,7 @@ struct erofs_configure {
 	bool c_random_pclusterblks;
 #endif
 	char c_timeinherit;
+	bool c_noinline_data;
 
 #ifdef HAVE_LIBSELINUX
 	struct selabel_handle *sehnd;
diff --git a/lib/inode.c b/lib/inode.c
index 97f0cf763baf..38906370f533 100644
--- a/lib/inode.c
+++ b/lib/inode.c
@@ -562,6 +562,11 @@ static int erofs_prepare_inode_buffer(struct erofs_inode *inode)
 	if (is_inode_layout_compression(inode))
 		goto noinline;
 
+	if (cfg.c_noinline_data && S_ISREG(inode->i_mode)) {
+		inode->datalayout = EROFS_INODE_FLAT_PLAIN;
+		goto noinline;
+	}
+
 	/*
 	 * if the file size is block-aligned for uncompressed files,
 	 * should use EROFS_INODE_FLAT_PLAIN data mapping mode.
diff --git a/mkfs/main.c b/mkfs/main.c
index 28539da5ea5f..10fe14d7a722 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -161,6 +161,12 @@ static int parse_extended_opts(const char *opts)
 				return -EINVAL;
 			erofs_sb_clear_sb_chksum();
 		}
+
+		if (MATCH_EXTENTED_OPT("noinline_data", token, keylen)) {
+			if (vallen)
+				return -EINVAL;
+			cfg.c_noinline_data = true;
+		}
 	}
 	return 0;
 }
-- 
2.24.4