ext4: add delalloc support for inline data

For delayed allocation mode, we write to inline data if the file
is small enough. And in case of we write to some offset larger
than the inline size, the 1st page is dirtied, so that
ext4_da_writepages can handle the conversion. When the 1st page
is initialized with blocks, the inline part is removed.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 27 insertions, 0 deletions

diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 7095ac13fbc..37e66f86764 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -154,6 +154,15 @@ extern struct buffer_head *
 ext4_journalled_write_inline_data(struct inode *inode,
 				  unsigned len,
 				  struct page *page);
+extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
+					   struct inode *inode,
+					   loff_t pos, unsigned len,
+					   unsigned flags,
+					   struct page **pagep,
+					   void **fsdata);
+extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
+					 unsigned len, unsigned copied,
+					 struct page *page);
 # else  /* CONFIG_EXT4_FS_XATTR */
 
 static inline int
@@ -300,6 +309,24 @@ ext4_journalled_write_inline_data(struct inode *inode,
 {
 	return NULL;
 }
+
+static inline int
+ext4_da_write_inline_data_begin(struct address_space *mapping,
+				struct inode *inode,
+				loff_t pos, unsigned len,
+				unsigned flags,
+				struct page **pagep,
+				void **fsdata)
+{
+	return 0;
+}
+
+static inline int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
+						unsigned len, unsigned copied,
+						struct page *page)
+{
+	return 0;
+}
 # endif  /* CONFIG_EXT4_FS_XATTR */
 
 #ifdef CONFIG_EXT4_FS_SECURITY