| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| 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> |
| #include <linux/refcount.h> |
| #include <uapi/linux/posix_acl.h> |
| |
| struct user_namespace; |
| |
| struct posix_acl_entry { |
| short e_tag; |
| unsigned short e_perm; |
| union { |
| kuid_t e_uid; |
| kgid_t e_gid; |
| }; |
| }; |
| |
| struct posix_acl { |
| refcount_t a_refcount; |
| struct rcu_head a_rcu; |
| unsigned int a_count; |
| struct posix_acl_entry a_entries[]; |
| }; |
| |
| #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) |
| refcount_inc(&acl->a_refcount); |
| return acl; |
| } |
| |
| /* |
| * Free an ACL handle. |
| */ |
| static inline void |
| posix_acl_release(struct posix_acl *acl) |
| { |
| if (acl && refcount_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 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 user_namespace *, struct inode *, int, |
| struct posix_acl *); |
| |
| struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); |
| |
| #ifdef CONFIG_FS_POSIX_ACL |
| int posix_acl_chmod(struct user_namespace *, struct inode *, umode_t); |
| extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, |
| struct posix_acl **); |
| int posix_acl_update_mode(struct user_namespace *, struct inode *, umode_t *, |
| struct posix_acl **); |
| |
| extern int simple_set_acl(struct user_namespace *, struct inode *, |
| struct posix_acl *, int); |
| extern int simple_acl_create(struct inode *, struct inode *); |
| |
| struct posix_acl *get_cached_acl(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); |
| int posix_acl_valid(struct user_namespace *, const struct posix_acl *); |
| int posix_acl_permission(struct user_namespace *, struct inode *, |
| const struct posix_acl *, int); |
| |
| 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 user_namespace *mnt_userns, |
| 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 */ |