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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/posix_acl_xattr.h
Initial import
Diffstat (limited to 'include/linux/posix_acl_xattr.h')
-rw-r--r--include/linux/posix_acl_xattr.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h
new file mode 100644
index 000000000..6f14ee295
--- /dev/null
+++ b/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 */