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- /*
- File: linux/posix_acl.h
- (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
- */
- #ifndef __LINUX_POSIX_ACL_H
- #define __LINUX_POSIX_ACL_H
- #include <linux/bug.h>
- #include <linux/slab.h>
- #include <linux/rcupdate.h>
- #define ACL_UNDEFINED_ID (-1)
- /* a_type field in acl_user_posix_entry_t */
- #define ACL_TYPE_ACCESS (0x8000)
- #define ACL_TYPE_DEFAULT (0x4000)
- /* e_tag entry in struct posix_acl_entry */
- #define ACL_USER_OBJ (0x01)
- #define ACL_USER (0x02)
- #define ACL_GROUP_OBJ (0x04)
- #define ACL_GROUP (0x08)
- #define ACL_MASK (0x10)
- #define ACL_OTHER (0x20)
- /* permissions in the e_perm field */
- #define ACL_READ (0x04)
- #define ACL_WRITE (0x02)
- #define ACL_EXECUTE (0x01)
- //#define ACL_ADD (0x08)
- //#define ACL_DELETE (0x10)
- struct posix_acl_entry {
- short e_tag;
- unsigned short e_perm;
- union {
- kuid_t e_uid;
- kgid_t e_gid;
- };
- };
- struct posix_acl {
- union {
- atomic_t a_refcount;
- struct rcu_head a_rcu;
- };
- unsigned int a_count;
- struct posix_acl_entry a_entries[0];
- };
- #define FOREACH_ACL_ENTRY(pa, acl, pe) \
- for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
- /*
- * Duplicate an ACL handle.
- */
- static inline struct posix_acl *
- posix_acl_dup(struct posix_acl *acl)
- {
- if (acl)
- atomic_inc(&acl->a_refcount);
- return acl;
- }
- /*
- * Free an ACL handle.
- */
- static inline void
- posix_acl_release(struct posix_acl *acl)
- {
- if (acl && atomic_dec_and_test(&acl->a_refcount))
- kfree_rcu(acl, a_rcu);
- }
- /* posix_acl.c */
- extern void posix_acl_init(struct posix_acl *, int);
- extern struct posix_acl *posix_acl_alloc(int, gfp_t);
- extern int posix_acl_valid(const struct posix_acl *);
- extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
- extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
- extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
- extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
- extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
- extern struct posix_acl *get_posix_acl(struct inode *, int);
- extern int set_posix_acl(struct inode *, int, struct posix_acl *);
- #ifdef CONFIG_FS_POSIX_ACL
- extern int posix_acl_chmod(struct inode *, umode_t);
- extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
- struct posix_acl **);
- extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
- extern int simple_set_acl(struct inode *, struct posix_acl *, int);
- extern int simple_acl_create(struct inode *, struct inode *);
- struct posix_acl **acl_by_type(struct inode *inode, int type);
- struct posix_acl *get_cached_acl(struct inode *inode, int type);
- struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
- void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
- void forget_cached_acl(struct inode *inode, int type);
- void forget_all_cached_acls(struct inode *inode);
- static inline void cache_no_acl(struct inode *inode)
- {
- inode->i_acl = NULL;
- inode->i_default_acl = NULL;
- }
- #else
- static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
- {
- return 0;
- }
- #define simple_set_acl NULL
- static inline int simple_acl_create(struct inode *dir, struct inode *inode)
- {
- return 0;
- }
- static inline void cache_no_acl(struct inode *inode)
- {
- }
- static inline int posix_acl_create(struct inode *inode, umode_t *mode,
- struct posix_acl **default_acl, struct posix_acl **acl)
- {
- *default_acl = *acl = NULL;
- return 0;
- }
- static inline void forget_all_cached_acls(struct inode *inode)
- {
- }
- #endif /* CONFIG_FS_POSIX_ACL */
- struct posix_acl *get_acl(struct inode *inode, int type);
- #endif /* __LINUX_POSIX_ACL_H */
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