Extend make_ext4fs to support setting SELinux security contexts in ext4 images.
Extend make_ext4fs with support for looking up the right security context from
the file_contexts configuration and setting it in the generated image. This is
similar to the existing support for looking up the UID/GID/mode via
android_filesystem_config.h and setting it, but via configuration rather than
defined in a header.
Change-Id: Ief9c44eeaaca4a44100a384b063f40b185469be3
diff --git a/ext4_utils/xattr.h b/ext4_utils/xattr.h
new file mode 100644
index 0000000..2c6d9cc
--- /dev/null
+++ b/ext4_utils/xattr.h
@@ -0,0 +1,23 @@
+#include <sys/types.h>
+
+#define EXT4_XATTR_MAGIC 0xEA020000
+#define EXT4_XATTR_INDEX_SECURITY 6
+
+struct ext4_xattr_entry {
+ __u8 e_name_len;
+ __u8 e_name_index;
+ __le16 e_value_offs;
+ __le32 e_value_block;
+ __le32 e_value_size;
+ __le32 e_hash;
+ char e_name[0];
+};
+
+#define EXT4_XATTR_PAD_BITS 2
+#define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
+#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
+#define EXT4_XATTR_LEN(name_len) \
+ (((name_len) + EXT4_XATTR_ROUND + \
+ sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
+#define EXT4_XATTR_SIZE(size) \
+ (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)