acl.h 1.5 KB
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/*
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  File: fs/ext4/acl.h
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  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/

#include <linux/posix_acl_xattr.h>

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#define EXT4_ACL_VERSION	0x0001
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typedef struct {
	__le16		e_tag;
	__le16		e_perm;
	__le32		e_id;
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} ext4_acl_entry;
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typedef struct {
	__le16		e_tag;
	__le16		e_perm;
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} ext4_acl_entry_short;
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typedef struct {
	__le32		a_version;
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} ext4_acl_header;
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static inline size_t ext4_acl_size(int count)
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{
	if (count <= 4) {
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		return sizeof(ext4_acl_header) +
		       count * sizeof(ext4_acl_entry_short);
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	} else {
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		return sizeof(ext4_acl_header) +
		       4 * sizeof(ext4_acl_entry_short) +
		       (count - 4) * sizeof(ext4_acl_entry);
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	}
}

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

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#ifdef CONFIG_EXT4_FS_POSIX_ACL
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/* acl.c */
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extern int ext4_check_acl(struct inode *, int);
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extern int ext4_acl_chmod(struct inode *);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
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#else  /* CONFIG_EXT4_FS_POSIX_ACL */
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#include <linux/sched.h>
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#define ext4_check_acl NULL
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static inline int
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ext4_acl_chmod(struct inode *inode)
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{
	return 0;
}

static inline int
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ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
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{
	return 0;
}
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#endif  /* CONFIG_EXT4_FS_POSIX_ACL */
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