87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*
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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, gfp_t);
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extern struct posix_acl *posix_acl_clone(const struct posix_acl *, gfp_t);
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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, gfp_t);
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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 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 */
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