diff options
| author | Theodore Y. Ts'o <tytso@snap.thunk.org> | 2002-10-30 16:27:48 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@penguin.transmeta.com> | 2002-10-30 16:27:48 -0500 |
| commit | 762b1b86548135488e5e7615f7de6c8a16f03bea (patch) | |
| tree | fb7574f90f2165f92b92ef60247b558cb3b0b643 /include | |
| parent | 8603affb62c17bb4107b3e1bd3be0ec6c81162c4 (diff) | |
Port of 0.8.50 acl patch to 2.5
This patch (as well as the following two) implements core ACL support.
This set of convenience functions is used by the ext2/3 filesystem,
and may be useful to other filesystems that wish to use "struct posix_acl"
as their internal representation of acl's. User mode tools which
support this interface may be found at http://acl.bestbits.at
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/posix_acl.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h new file mode 100644 index 000000000000..aff9a6adb39e --- /dev/null +++ b/include/linux/posix_acl.h @@ -0,0 +1,87 @@ +/* + 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/slab.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; + unsigned int e_id; +}; + +struct posix_acl { + atomic_t a_refcount; + 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(acl); +} + + +/* posix_acl.c */ + +extern struct posix_acl *posix_acl_alloc(int, int); +extern struct posix_acl *posix_acl_clone(const struct posix_acl *, int); +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(mode_t, int); +extern int posix_acl_equiv_mode(const struct posix_acl *, mode_t *); +extern int posix_acl_create_masq(struct posix_acl *, mode_t *); +extern int posix_acl_chmod_masq(struct posix_acl *, mode_t); +extern int posix_acl_masq_nfs_mode(struct posix_acl *, mode_t *); + +extern struct posix_acl *get_posix_acl(struct inode *, int); +extern int set_posix_acl(struct inode *, int, struct posix_acl *); + +#endif /* __LINUX_POSIX_ACL_H */ |