[linux-2.6-block.git] / fs / ext2 / acl.h

/*
  File: fs/ext2/acl.h

  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/

#include <linux/posix_acl_xattr.h>

#define EXT2_ACL_VERSION	0x0001

typedef struct {
	__le16		e_tag;
	__le16		e_perm;
	__le32		e_id;
} ext2_acl_entry;

typedef struct {
	__le16		e_tag;
	__le16		e_perm;
} ext2_acl_entry_short;

typedef struct {
	__le32		a_version;
} ext2_acl_header;

static inline size_t ext2_acl_size(int count)
{
	if (count <= 4) {
		return sizeof(ext2_acl_header) +
		       count * sizeof(ext2_acl_entry_short);
	} else {
		return sizeof(ext2_acl_header) +
		       4 * sizeof(ext2_acl_entry_short) +
		       (count - 4) * sizeof(ext2_acl_entry);
	}
}

static inline int ext2_acl_count(size_t size)
{
	ssize_t s;
	size -= sizeof(ext2_acl_header);
	s = size - 4 * sizeof(ext2_acl_entry_short);
	if (s < 0) {
		if (size % sizeof(ext2_acl_entry_short))
			return -1;
		return size / sizeof(ext2_acl_entry_short);
	} else {
		if (s % sizeof(ext2_acl_entry))
			return -1;
		return s / sizeof(ext2_acl_entry) + 4;
	}
}

#ifdef CONFIG_EXT2_FS_POSIX_ACL

/* Value for inode->u.ext2_i.i_acl and inode->u.ext2_i.i_default_acl
   if the ACL has not been cached */
#define EXT2_ACL_NOT_CACHED ((void *)-1)

/* acl.c */
extern int ext2_permission (struct inode *, int);
extern int ext2_acl_chmod (struct inode *);
extern int ext2_init_acl (struct inode *, struct inode *);

#else
#include <linux/sched.h>
#define ext2_permission NULL
#define ext2_get_acl	NULL
#define ext2_set_acl	NULL

static inline int
ext2_acl_chmod (struct inode *inode)
{
	return 0;
}

static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
{
	return 0;
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	File: fs/ext2/acl.h
	3
	4	(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
	5	*/
	6
9a59f452	7	#include <linux/posix_acl_xattr.h>
1da177e4 LT	8
	9	#define EXT2_ACL_VERSION 0x0001
	10
	11	typedef struct {
	12	__le16 e_tag;
	13	__le16 e_perm;
	14	__le32 e_id;
	15	} ext2_acl_entry;
	16
	17	typedef struct {
	18	__le16 e_tag;
	19	__le16 e_perm;
	20	} ext2_acl_entry_short;
	21
	22	typedef struct {
	23	__le32 a_version;
	24	} ext2_acl_header;
	25
	26	static inline size_t ext2_acl_size(int count)
	27	{
	28	if (count <= 4) {
	29	return sizeof(ext2_acl_header) +
	30	count * sizeof(ext2_acl_entry_short);
	31	} else {
	32	return sizeof(ext2_acl_header) +
	33	4 * sizeof(ext2_acl_entry_short) +
	34	(count - 4) * sizeof(ext2_acl_entry);
	35	}
	36	}
	37
	38	static inline int ext2_acl_count(size_t size)
	39	{
	40	ssize_t s;
	41	size -= sizeof(ext2_acl_header);
	42	s = size - 4 * sizeof(ext2_acl_entry_short);
	43	if (s < 0) {
	44	if (size % sizeof(ext2_acl_entry_short))
	45	return -1;
	46	return size / sizeof(ext2_acl_entry_short);
	47	} else {
	48	if (s % sizeof(ext2_acl_entry))
	49	return -1;
	50	return s / sizeof(ext2_acl_entry) + 4;
	51	}
	52	}
	53
	54	#ifdef CONFIG_EXT2_FS_POSIX_ACL
	55
	56	/* Value for inode->u.ext2_i.i_acl and inode->u.ext2_i.i_default_acl
	57	if the ACL has not been cached */
	58	#define EXT2_ACL_NOT_CACHED ((void *)-1)
	59
	60	/* acl.c */
e6305c43	61	extern int ext2_permission (struct inode *, int);
1da177e4 LT	62	extern int ext2_acl_chmod (struct inode *);
	63	extern int ext2_init_acl (struct inode , struct inode );
	64
	65	#else
	66	#include <linux/sched.h>
	67	#define ext2_permission NULL
	68	#define ext2_get_acl NULL
	69	#define ext2_set_acl NULL
	70
	71	static inline int
	72	ext2_acl_chmod (struct inode *inode)
	73	{
	74	return 0;
	75	}
	76
	77	static inline int ext2_init_acl (struct inode inode, struct inode dir)
	78	{
	79	return 0;
	80	}
	81	#endif
	82