| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | File: linux/posix_acl.h |
| 4 | |
| 5 | (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 6 | */ |
| 7 | |
| 8 | |
| 9 | #ifndef __LINUX_POSIX_ACL_H |
| 10 | #define __LINUX_POSIX_ACL_H |
| 11 | |
| 12 | #include <linux/bug.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/rcupdate.h> |
| 15 | #include <linux/refcount.h> |
| 16 | #include <uapi/linux/posix_acl.h> |
| 17 | |
| 18 | struct posix_acl_entry { |
| 19 | short e_tag; |
| 20 | unsigned short e_perm; |
| 21 | union { |
| 22 | kuid_t e_uid; |
| 23 | kgid_t e_gid; |
| 24 | }; |
| 25 | }; |
| 26 | |
| 27 | struct posix_acl { |
| 28 | refcount_t a_refcount; |
| 29 | struct rcu_head a_rcu; |
| 30 | unsigned int a_count; |
| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 31 | struct posix_acl_entry a_entries[]; |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 32 | }; |
| 33 | |
| 34 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ |
| 35 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) |
| 36 | |
| 37 | |
| 38 | /* |
| 39 | * Duplicate an ACL handle. |
| 40 | */ |
| 41 | static inline struct posix_acl * |
| 42 | posix_acl_dup(struct posix_acl *acl) |
| 43 | { |
| 44 | if (acl) |
| 45 | refcount_inc(&acl->a_refcount); |
| 46 | return acl; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * Free an ACL handle. |
| 51 | */ |
| 52 | static inline void |
| 53 | posix_acl_release(struct posix_acl *acl) |
| 54 | { |
| 55 | if (acl && refcount_dec_and_test(&acl->a_refcount)) |
| 56 | kfree_rcu(acl, a_rcu); |
| 57 | } |
| 58 | |
| 59 | |
| 60 | /* posix_acl.c */ |
| 61 | |
| 62 | extern void posix_acl_init(struct posix_acl *, int); |
| 63 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
| 64 | extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *); |
| 65 | extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); |
| 66 | extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t); |
| 67 | extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *); |
| 68 | extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *); |
| 69 | extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t); |
| 70 | |
| 71 | extern struct posix_acl *get_posix_acl(struct inode *, int); |
| 72 | extern int set_posix_acl(struct inode *, int, struct posix_acl *); |
| 73 | |
| 74 | #ifdef CONFIG_FS_POSIX_ACL |
| 75 | extern int posix_acl_chmod(struct inode *, umode_t); |
| 76 | extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, |
| 77 | struct posix_acl **); |
| 78 | extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **); |
| 79 | |
| 80 | extern int simple_set_acl(struct inode *, struct posix_acl *, int); |
| 81 | extern int simple_acl_create(struct inode *, struct inode *); |
| 82 | |
| 83 | struct posix_acl *get_cached_acl(struct inode *inode, int type); |
| 84 | struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); |
| 85 | void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl); |
| 86 | void forget_cached_acl(struct inode *inode, int type); |
| 87 | void forget_all_cached_acls(struct inode *inode); |
| 88 | |
| 89 | static inline void cache_no_acl(struct inode *inode) |
| 90 | { |
| 91 | inode->i_acl = NULL; |
| 92 | inode->i_default_acl = NULL; |
| 93 | } |
| 94 | #else |
| 95 | static inline int posix_acl_chmod(struct inode *inode, umode_t mode) |
| 96 | { |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | #define simple_set_acl NULL |
| 101 | |
| 102 | static inline int simple_acl_create(struct inode *dir, struct inode *inode) |
| 103 | { |
| 104 | return 0; |
| 105 | } |
| 106 | static inline void cache_no_acl(struct inode *inode) |
| 107 | { |
| 108 | } |
| 109 | |
| 110 | static inline int posix_acl_create(struct inode *inode, umode_t *mode, |
| 111 | struct posix_acl **default_acl, struct posix_acl **acl) |
| 112 | { |
| 113 | *default_acl = *acl = NULL; |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static inline void forget_all_cached_acls(struct inode *inode) |
| 118 | { |
| 119 | } |
| 120 | #endif /* CONFIG_FS_POSIX_ACL */ |
| 121 | |
| 122 | struct posix_acl *get_acl(struct inode *inode, int type); |
| 123 | |
| 124 | #endif /* __LINUX_POSIX_ACL_H */ |