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/*
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  File: linux/posix_acl.h
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  (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#ifndef __LINUX_POSIX_ACL_H
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#define __LINUX_POSIX_ACL_H
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#include <linux/slab.h>
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#define ACL_UNDEFINED_ID        (-1)
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/* a_type field in acl_user_posix_entry_t */
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#define ACL_TYPE_ACCESS         (0x8000)
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#define ACL_TYPE_DEFAULT        (0x4000)
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/* e_tag entry in struct posix_acl_entry */
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#define ACL_USER_OBJ            (0x01)
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#define ACL_USER                (0x02)
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#define ACL_GROUP_OBJ           (0x04)
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#define ACL_GROUP               (0x08)
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#define ACL_MASK                (0x10)
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#define ACL_OTHER               (0x20)
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/* permissions in the e_perm field */
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#define ACL_READ                (0x04)
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#define ACL_WRITE               (0x02)
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#define ACL_EXECUTE             (0x01)
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//#define ACL_ADD               (0x08)
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//#define ACL_DELETE            (0x10)
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struct posix_acl_entry {
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        short                   e_tag;
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        unsigned short          e_perm;
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        unsigned int            e_id;
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};
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struct posix_acl {
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        atomic_t                a_refcount;
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        unsigned int            a_count;
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        struct posix_acl_entry  a_entries[0];
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};
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#define FOREACH_ACL_ENTRY(pa, acl, pe) \
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        for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
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/*
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 * Duplicate an ACL handle.
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 */
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static inline struct posix_acl *
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posix_acl_dup(struct posix_acl *acl)
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{
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        if (acl)
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                atomic_inc(&acl->a_refcount);
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        return acl;
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}
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/*
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 * Free an ACL handle.
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 */
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static inline void
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posix_acl_release(struct posix_acl *acl)
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{
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        if (acl && atomic_dec_and_test(&acl->a_refcount))
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                kfree(acl);
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}
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/* posix_acl.c */
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extern struct posix_acl *posix_acl_alloc(int, int);
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extern struct posix_acl *posix_acl_clone(const struct posix_acl *, int);
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extern int posix_acl_valid(const struct posix_acl *);
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extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
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extern struct posix_acl *posix_acl_from_mode(mode_t, int);
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extern int posix_acl_equiv_mode(const struct posix_acl *, mode_t *);
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extern int posix_acl_create_masq(struct posix_acl *, mode_t *);
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extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
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extern int posix_acl_masq_nfs_mode(struct posix_acl *, mode_t *);
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extern struct posix_acl *get_posix_acl(struct inode *, int);
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extern int set_posix_acl(struct inode *, int, struct posix_acl *);
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#endif  /* __LINUX_POSIX_ACL_H */