[linux.git] / fs / ext4 / acl.h

/*
  File: fs/ext4/acl.h

  (C) 2001 Andreas Gruenbacher, <[email protected]>
*/

#include <linux/posix_acl_xattr.h>

#define EXT4_ACL_VERSION	0x0001

typedef struct {
	__le16		e_tag;
	__le16		e_perm;
	__le32		e_id;
} ext4_acl_entry;

typedef struct {
	__le16		e_tag;
	__le16		e_perm;
} ext4_acl_entry_short;

typedef struct {
	__le32		a_version;
} ext4_acl_header;

static inline size_t ext4_acl_size(int count)
{
	if (count <= 4) {
		return sizeof(ext4_acl_header) +
		       count * sizeof(ext4_acl_entry_short);
	} else {
		return sizeof(ext4_acl_header) +
		       4 * sizeof(ext4_acl_entry_short) +
		       (count - 4) * sizeof(ext4_acl_entry);
	}
}

static inline int ext4_acl_count(size_t size)
{
	ssize_t s;
	size -= sizeof(ext4_acl_header);
	s = size - 4 * sizeof(ext4_acl_entry_short);
	if (s < 0) {
		if (size % sizeof(ext4_acl_entry_short))
			return -1;
		return size / sizeof(ext4_acl_entry_short);
	} else {
		if (s % sizeof(ext4_acl_entry))
			return -1;
		return s / sizeof(ext4_acl_entry) + 4;
	}
}

#ifdef CONFIG_EXT4_FS_POSIX_ACL

/* acl.c */
extern int ext4_check_acl(struct inode *, int);
extern int ext4_acl_chmod(struct inode *);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);

#else  /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_check_acl NULL

static inline int
ext4_acl_chmod(struct inode *inode)
{
	return 0;
}

static inline int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
	return 0;
}
#endif  /* CONFIG_EXT4_FS_POSIX_ACL */
Commit	Line	Data
ac27a0ec	1	/*
617ba13b	2	File: fs/ext4/acl.h
ac27a0ec DK	3
	4	(C) 2001 Andreas Gruenbacher, <[email protected]>
	5	*/
	6
	7	#include <linux/posix_acl_xattr.h>
	8
617ba13b	9	#define EXT4_ACL_VERSION 0x0001
ac27a0ec DK	10
	11	typedef struct {
	12	__le16 e_tag;
	13	__le16 e_perm;
	14	__le32 e_id;
617ba13b	15	} ext4_acl_entry;
ac27a0ec DK	16
	17	typedef struct {
	18	__le16 e_tag;
	19	__le16 e_perm;
617ba13b	20	} ext4_acl_entry_short;
ac27a0ec DK	21
	22	typedef struct {
	23	__le32 a_version;
617ba13b	24	} ext4_acl_header;
ac27a0ec	25
617ba13b	26	static inline size_t ext4_acl_size(int count)
ac27a0ec DK	27	{
ac27a0ec DK	28	if (count <= 4) {
617ba13b MC	29	return sizeof(ext4_acl_header) +
617ba13b MC	30	count * sizeof(ext4_acl_entry_short);
ac27a0ec	31	} else {
617ba13b MC	32	return sizeof(ext4_acl_header) +
	33	4 * sizeof(ext4_acl_entry_short) +
	34	(count - 4) * sizeof(ext4_acl_entry);
ac27a0ec DK	35	}
	36	}
	37
617ba13b	38	static inline int ext4_acl_count(size_t size)
ac27a0ec DK	39	{
ac27a0ec DK	40	ssize_t s;
617ba13b MC	41	size -= sizeof(ext4_acl_header);
617ba13b MC	42	s = size - 4 * sizeof(ext4_acl_entry_short);
ac27a0ec	43	if (s < 0) {
617ba13b	44	if (size % sizeof(ext4_acl_entry_short))
ac27a0ec	45	return -1;
617ba13b	46	return size / sizeof(ext4_acl_entry_short);
ac27a0ec	47	} else {
617ba13b	48	if (s % sizeof(ext4_acl_entry))
ac27a0ec	49	return -1;
617ba13b	50	return s / sizeof(ext4_acl_entry) + 4;
ac27a0ec DK	51	}
	52	}
	53
03010a33	54	#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec	55
ac27a0ec	56	/* acl.c */
1d5ccd1c	57	extern int ext4_check_acl(struct inode *, int);
af5bc92d TT	58	extern int ext4_acl_chmod(struct inode *);
af5bc92d TT	59	extern int ext4_init_acl(handle_t , struct inode , struct inode *);
ac27a0ec	60
03010a33	61	#else /* CONFIG_EXT4_FS_POSIX_ACL */
ac27a0ec	62	#include <linux/sched.h>
1d5ccd1c	63	#define ext4_check_acl NULL
ac27a0ec DK	64
ac27a0ec DK	65	static inline int
617ba13b	66	ext4_acl_chmod(struct inode *inode)
ac27a0ec DK	67	{
	68	return 0;
	69	}
	70
	71	static inline int
617ba13b	72	ext4_init_acl(handle_t handle, struct inode inode, struct inode *dir)
ac27a0ec DK	73	{
	74	return 0;
	75	}
03010a33	76	#endif /* CONFIG_EXT4_FS_POSIX_ACL */
ac27a0ec	77