Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / posix_acl_xattr.h

diff --git a/kernel/include/linux/posix_acl_xattr.h b/kernel/include/linux/posix_acl_xattr.h
new file mode 100644 (file)
index 0000000..6f14ee2
--- /dev/null
+++ b/kernel/include/linux/posix_acl_xattr.h
@@ -0,0 +1,75 @@
+/*
+  File: linux/posix_acl_xattr.h
+
+  Extended attribute system call representation of Access Control Lists.
+
+  Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
+  Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
+ */
+#ifndef _POSIX_ACL_XATTR_H
+#define _POSIX_ACL_XATTR_H
+
+#include <linux/posix_acl.h>
+
+/* Extended attribute names */
+#define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access"
+#define POSIX_ACL_XATTR_DEFAULT        "system.posix_acl_default"
+
+/* Supported ACL a_version fields */
+#define POSIX_ACL_XATTR_VERSION        0x0002
+
+
+/* An undefined entry e_id value */
+#define ACL_UNDEFINED_ID       (-1)
+
+typedef struct {
+       __le16                  e_tag;
+       __le16                  e_perm;
+       __le32                  e_id;
+} posix_acl_xattr_entry;
+
+typedef struct {
+       __le32                  a_version;
+       posix_acl_xattr_entry   a_entries[0];
+} posix_acl_xattr_header;
+
+
+static inline size_t
+posix_acl_xattr_size(int count)
+{
+       return (sizeof(posix_acl_xattr_header) +
+               (count * sizeof(posix_acl_xattr_entry)));
+}
+
+static inline int
+posix_acl_xattr_count(size_t size)
+{
+       if (size < sizeof(posix_acl_xattr_header))
+               return -1;
+       size -= sizeof(posix_acl_xattr_header);
+       if (size % sizeof(posix_acl_xattr_entry))
+               return -1;
+       return size / sizeof(posix_acl_xattr_entry);
+}
+
+#ifdef CONFIG_FS_POSIX_ACL
+void posix_acl_fix_xattr_from_user(void *value, size_t size);
+void posix_acl_fix_xattr_to_user(void *value, size_t size);
+#else
+static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
+{
+}
+static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
+{
+}
+#endif
+
+struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
+                                      const void *value, size_t size);
+int posix_acl_to_xattr(struct user_namespace *user_ns,
+                      const struct posix_acl *acl, void *buffer, size_t size);
+
+extern const struct xattr_handler posix_acl_access_xattr_handler;
+extern const struct xattr_handler posix_acl_default_xattr_handler;
+
+#endif /* _POSIX_ACL_XATTR_H */