diff options
Diffstat (limited to 'include/linux/posix_acl.h')
| -rw-r--r-- | include/linux/posix_acl.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h new file mode 100644 index 000000000..3e96a6a76 --- /dev/null +++ b/include/linux/posix_acl.h @@ -0,0 +1,144 @@ +/* + 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 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 */ |