1 files changed, 56 insertions, 0 deletions
diff --git a/libbcache/acl.h b/libbcache/acl.h
new file mode 100644
index 00000000..079e5689
--- /dev/null
+++ b/libbcache/acl.h
@@ -0,0 +1,56 @@
+/*
+  File: fs/bch/acl.h
+
+  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+
+#include <linux/posix_acl_xattr.h>
+
+#define BCH_ACL_VERSION	0x0001
+
+typedef struct {
+	__le16		e_tag;
+	__le16		e_perm;
+	__le32		e_id;
+} bch_acl_entry;
+
+typedef struct {
+	__le16		e_tag;
+	__le16		e_perm;
+} bch_acl_entry_short;
+
+typedef struct {
+	__le32		a_version;
+} bch_acl_header;
+
+static inline size_t bch_acl_size(int count)
+{
+	if (count <= 4) {
+		return sizeof(bch_acl_header) +
+		       count * sizeof(bch_acl_entry_short);
+	} else {
+		return sizeof(bch_acl_header) +
+		       4 * sizeof(bch_acl_entry_short) +
+		       (count - 4) * sizeof(bch_acl_entry);
+	}
+}
+
+static inline int bch_acl_count(size_t size)
+{
+	ssize_t s;
+
+	size -= sizeof(bch_acl_header);
+	s = size - 4 * sizeof(bch_acl_entry_short);
+	if (s < 0) {
+		if (size % sizeof(bch_acl_entry_short))
+			return -1;
+		return size / sizeof(bch_acl_entry_short);
+	} else {
+		if (s % sizeof(bch_acl_entry))
+			return -1;
+		return s / sizeof(bch_acl_entry) + 4;
+	}
+}
+
+extern struct posix_acl *bch_get_acl(struct inode *, int);
+extern int bch_set_acl(struct inode *, struct posix_acl *, int);