| 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 user_namespace; |
| 19 | |
| 20 | struct posix_acl_entry { |
| 21 | short e_tag; |
| 22 | unsigned short e_perm; |
| 23 | union { |
| 24 | kuid_t e_uid; |
| 25 | kgid_t e_gid; |
| 26 | }; |
| 27 | }; |
| 28 | |
| 29 | struct posix_acl { |
| 30 | refcount_t a_refcount; |
| 31 | struct rcu_head a_rcu; |
| 32 | unsigned int a_count; |
| 33 | struct posix_acl_entry a_entries[]; |
| 34 | }; |
| 35 | |
| 36 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ |
| 37 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) |
| 38 | |
| 39 | |
| 40 | /* |
| 41 | * Duplicate an ACL handle. |
| 42 | */ |
| 43 | static inline struct posix_acl * |
| 44 | posix_acl_dup(struct posix_acl *acl) |
| 45 | { |
| 46 | if (acl) |
| 47 | refcount_inc(&acl->a_refcount); |
| 48 | return acl; |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * Free an ACL handle. |
| 53 | */ |
| 54 | static inline void |
| 55 | posix_acl_release(struct posix_acl *acl) |
| 56 | { |
| 57 | if (acl && refcount_dec_and_test(&acl->a_refcount)) |
| 58 | kfree_rcu(acl, a_rcu); |
| 59 | } |
| 60 | |
| 61 | |
| 62 | /* posix_acl.c */ |
| 63 | |
| 64 | extern void posix_acl_init(struct posix_acl *, int); |
| 65 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
| 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 | int set_posix_acl(struct mnt_idmap *, struct dentry *, int, |
| 73 | struct posix_acl *); |
| 74 | |
| 75 | struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); |
| 76 | struct posix_acl *posix_acl_clone(const struct posix_acl *acl, gfp_t flags); |
| 77 | |
| 78 | #ifdef CONFIG_FS_POSIX_ACL |
| 79 | int posix_acl_chmod(struct mnt_idmap *, struct dentry *, umode_t); |
| 80 | extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, |
| 81 | struct posix_acl **); |
| 82 | int posix_acl_update_mode(struct mnt_idmap *, struct inode *, umode_t *, |
| 83 | struct posix_acl **); |
| 84 | |
| 85 | int simple_set_acl(struct mnt_idmap *, struct dentry *, |
| 86 | struct posix_acl *, int); |
| 87 | extern int simple_acl_create(struct inode *, struct inode *); |
| 88 | |
| 89 | struct posix_acl *get_cached_acl(struct inode *inode, int type); |
| 90 | void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl); |
| 91 | void forget_cached_acl(struct inode *inode, int type); |
| 92 | void forget_all_cached_acls(struct inode *inode); |
| 93 | int posix_acl_valid(struct user_namespace *, const struct posix_acl *); |
| 94 | int posix_acl_permission(struct mnt_idmap *, struct inode *, |
| 95 | const struct posix_acl *, int); |
| 96 | |
| 97 | static inline void cache_no_acl(struct inode *inode) |
| 98 | { |
| 99 | inode->i_acl = NULL; |
| 100 | inode->i_default_acl = NULL; |
| 101 | } |
| 102 | |
| 103 | int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
| 104 | const char *acl_name, struct posix_acl *kacl); |
| 105 | struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap, |
| 106 | struct dentry *dentry, const char *acl_name); |
| 107 | int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
| 108 | const char *acl_name); |
| 109 | int posix_acl_listxattr(struct inode *inode, char **buffer, |
| 110 | ssize_t *remaining_size); |
| 111 | #else |
| 112 | static inline int posix_acl_chmod(struct mnt_idmap *idmap, |
| 113 | struct dentry *dentry, umode_t mode) |
| 114 | { |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | #define simple_set_acl NULL |
| 119 | |
| 120 | static inline int simple_acl_create(struct inode *dir, struct inode *inode) |
| 121 | { |
| 122 | return 0; |
| 123 | } |
| 124 | static inline void cache_no_acl(struct inode *inode) |
| 125 | { |
| 126 | } |
| 127 | |
| 128 | static inline int posix_acl_create(struct inode *inode, umode_t *mode, |
| 129 | struct posix_acl **default_acl, struct posix_acl **acl) |
| 130 | { |
| 131 | *default_acl = *acl = NULL; |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | static inline void forget_all_cached_acls(struct inode *inode) |
| 136 | { |
| 137 | } |
| 138 | |
| 139 | static inline int vfs_set_acl(struct mnt_idmap *idmap, |
| 140 | struct dentry *dentry, const char *name, |
| 141 | struct posix_acl *acl) |
| 142 | { |
| 143 | return -EOPNOTSUPP; |
| 144 | } |
| 145 | |
| 146 | static inline struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap, |
| 147 | struct dentry *dentry, |
| 148 | const char *acl_name) |
| 149 | { |
| 150 | return ERR_PTR(-EOPNOTSUPP); |
| 151 | } |
| 152 | |
| 153 | static inline int vfs_remove_acl(struct mnt_idmap *idmap, |
| 154 | struct dentry *dentry, const char *acl_name) |
| 155 | { |
| 156 | return -EOPNOTSUPP; |
| 157 | } |
| 158 | static inline int posix_acl_listxattr(struct inode *inode, char **buffer, |
| 159 | ssize_t *remaining_size) |
| 160 | { |
| 161 | return 0; |
| 162 | } |
| 163 | #endif /* CONFIG_FS_POSIX_ACL */ |
| 164 | |
| 165 | struct posix_acl *get_inode_acl(struct inode *inode, int type); |
| 166 | |
| 167 | #endif /* __LINUX_POSIX_ACL_H */ |