ext4: add the basic function for inline data support
Implement inline data with xattr.
Now we use "system.data" to store xattr, and the xattr will
be extended if the i_size is increased while we don't release
the space during truncate.
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 40ca7a6..7ae0d05 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -21,6 +21,7 @@
#define EXT4_XATTR_INDEX_TRUSTED 4
#define EXT4_XATTR_INDEX_LUSTRE 5
#define EXT4_XATTR_INDEX_SECURITY 6
+#define EXT4_XATTR_INDEX_SYSTEM 7
struct ext4_xattr_header {
__le32 h_magic; /* magic number for identification */
@@ -125,6 +126,19 @@
struct ext4_xattr_info *i,
struct ext4_xattr_ibody_find *is);
+extern int ext4_has_inline_data(struct inode *inode);
+extern int ext4_get_inline_size(struct inode *inode);
+extern int ext4_get_max_inline_size(struct inode *inode);
+extern int ext4_find_inline_data_nolock(struct inode *inode);
+extern void ext4_write_inline_data(struct inode *inode,
+ struct ext4_iloc *iloc,
+ void *buffer, loff_t pos,
+ unsigned int len);
+extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
+ unsigned int len);
+extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
+ unsigned int len);
+extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
# else /* CONFIG_EXT4_FS_XATTR */
static inline int
@@ -201,6 +215,46 @@
return -EOPNOTSUPP;
}
+static inline int ext4_find_inline_data_nolock(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int ext4_has_inline_data(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int ext4_get_inline_size(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int ext4_get_max_inline_size(struct inode *inode)
+{
+ return 0;
+}
+
+static inline void ext4_write_inline_data(struct inode *inode,
+ struct ext4_iloc *iloc,
+ void *buffer, loff_t pos,
+ unsigned int len)
+{
+ return;
+}
+
+static inline int ext4_init_inline_data(handle_t *handle,
+ struct inode *inode,
+ unsigned int len)
+{
+ return 0;
+}
+
+static inline int ext4_destroy_inline_data(handle_t *handle,
+ struct inode *inode)
+{
+ return 0;
+}
# endif /* CONFIG_EXT4_FS_XATTR */
#ifdef CONFIG_EXT4_FS_SECURITY