From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- include/linux/posix_acl_xattr.h | 75 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 include/linux/posix_acl_xattr.h (limited to 'include/linux/posix_acl_xattr.h') 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 + Copyright (C) 2002 SGI - Silicon Graphics, Inc + */ +#ifndef _POSIX_ACL_XATTR_H +#define _POSIX_ACL_XATTR_H + +#include + +/* 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 */ -- cgit v1.2.3-54-g00ecf