[linux.git] / fs / ext2 / acl.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
  File: fs/ext2/acl.h

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

#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

/* acl.c */
extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
extern int ext2_init_acl (struct inode *, struct inode *);

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

static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
{
	return 0;
}
#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	File: fs/ext2/acl.h
	4
	5	(C) 2001 Andreas Gruenbacher, <[email protected]>
	6	*/
	7
9a59f452	8	#include <linux/posix_acl_xattr.h>
1da177e4 LT	9
	10	#define EXT2_ACL_VERSION 0x0001
	11
	12	typedef struct {
	13	__le16 e_tag;
	14	__le16 e_perm;
	15	__le32 e_id;
	16	} ext2_acl_entry;
	17
	18	typedef struct {
	19	__le16 e_tag;
	20	__le16 e_perm;
	21	} ext2_acl_entry_short;
	22
	23	typedef struct {
	24	__le32 a_version;
	25	} ext2_acl_header;
	26
	27	static inline size_t ext2_acl_size(int count)
	28	{
	29	if (count <= 4) {
	30	return sizeof(ext2_acl_header) +
	31	count * sizeof(ext2_acl_entry_short);
	32	} else {
	33	return sizeof(ext2_acl_header) +
	34	4 * sizeof(ext2_acl_entry_short) +
	35	(count - 4) * sizeof(ext2_acl_entry);
	36	}
	37	}
	38
	39	static inline int ext2_acl_count(size_t size)
	40	{
	41	ssize_t s;
	42	size -= sizeof(ext2_acl_header);
	43	s = size - 4 * sizeof(ext2_acl_entry_short);
	44	if (s < 0) {
	45	if (size % sizeof(ext2_acl_entry_short))
	46	return -1;
	47	return size / sizeof(ext2_acl_entry_short);
	48	} else {
	49	if (s % sizeof(ext2_acl_entry))
	50	return -1;
	51	return s / sizeof(ext2_acl_entry) + 4;
	52	}
	53	}
	54
	55	#ifdef CONFIG_EXT2_FS_POSIX_ACL
	56
1da177e4	57	/* acl.c */
4e34e719	58	extern struct posix_acl ext2_get_acl(struct inode inode, int type);
64e178a7	59	extern int ext2_set_acl(struct inode inode, struct posix_acl acl, int type);
1da177e4 LT	60	extern int ext2_init_acl (struct inode , struct inode );
	61
	62	#else
	63	#include <linux/sched.h>
4e34e719	64	#define ext2_get_acl NULL
1da177e4 LT	65	#define ext2_set_acl NULL
1da177e4 LT	66
1da177e4 LT	67	static inline int ext2_init_acl (struct inode inode, struct inode dir)
	68	{
	69	return 0;
	70	}
	71	#endif
	72