[net-next-2.6.git] / include / linux / posix_acl_xattr.h

/*
  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);
}

struct posix_acl *posix_acl_from_xattr(const void *value, size_t size);
int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size);

#endif	/* _POSIX_ACL_XATTR_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	File: linux/posix_acl_xattr.h
	3
	4	Extended attribute system call representation of Access Control Lists.
	5
	6	Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
	7	Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
	8	*/
	9	#ifndef _POSIX_ACL_XATTR_H
	10	#define _POSIX_ACL_XATTR_H
	11
	12	#include <linux/posix_acl.h>
	13
	14	/* Extended attribute names */
	15	#define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access"
	16	#define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"
	17
	18	/* Supported ACL a_version fields */
	19	#define POSIX_ACL_XATTR_VERSION 0x0002
	20
	21
	22	/* An undefined entry e_id value */
	23	#define ACL_UNDEFINED_ID (-1)
	24
	25	typedef struct {
f9fd27a2 CH	26	__le16 e_tag;
	27	__le16 e_perm;
	28	__le32 e_id;
1da177e4 LT	29	} posix_acl_xattr_entry;
	30
	31	typedef struct {
f9fd27a2	32	__le32 a_version;
1da177e4 LT	33	posix_acl_xattr_entry a_entries[0];
	34	} posix_acl_xattr_header;
	35
	36
	37	static inline size_t
	38	posix_acl_xattr_size(int count)
	39	{
	40	return (sizeof(posix_acl_xattr_header) +
	41	(count * sizeof(posix_acl_xattr_entry)));
	42	}
	43
	44	static inline int
	45	posix_acl_xattr_count(size_t size)
	46	{
	47	if (size < sizeof(posix_acl_xattr_header))
	48	return -1;
	49	size -= sizeof(posix_acl_xattr_header);
	50	if (size % sizeof(posix_acl_xattr_entry))
	51	return -1;
	52	return size / sizeof(posix_acl_xattr_entry);
	53	}
	54
9a59f452 CH	55	struct posix_acl posix_acl_from_xattr(const void value, size_t size);
	56	int posix_acl_to_xattr(const struct posix_acl acl, void buffer, size_t size);
	57
1da177e4	58	#endif /* _POSIX_ACL_XATTR_H */