zfs_fuid.h revision 1.1.1.2 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#ifndef	_SYS_FS_ZFS_FUID_H
27#define	_SYS_FS_ZFS_FUID_H
28
29#ifdef _KERNEL
30#include <sys/kidmap.h>
31#include <sys/sid.h>
32#include <sys/dmu.h>
33#include <sys/zfs_vfsops.h>
34#endif
35#include <sys/avl.h>
36
37#ifdef	__cplusplus
38extern "C" {
39#endif
40
41typedef enum {
42	ZFS_OWNER,
43	ZFS_GROUP,
44	ZFS_ACE_USER,
45	ZFS_ACE_GROUP
46} zfs_fuid_type_t;
47
48/*
49 * Estimate space needed for one more fuid table entry.
50 * for now assume its current size + 1K
51 */
52#define	FUID_SIZE_ESTIMATE(z) ((z)->z_fuid_size + (SPA_MINBLOCKSIZE << 1))
53
54#define	FUID_INDEX(x)	((x) >> 32)
55#define	FUID_RID(x)	((x) & 0xffffffff)
56#define	FUID_ENCODE(idx, rid) (((uint64_t)(idx) << 32) | (rid))
57/*
58 * FUIDs cause problems for the intent log
59 * we need to replay the creation of the FUID,
60 * but we can't count on the idmapper to be around
61 * and during replay the FUID index may be different than
62 * before.  Also, if an ACL has 100 ACEs and 12 different
63 * domains we don't want to log 100 domain strings, but rather
64 * just the unique 12.
65 */
66
67/*
68 * The FUIDs in the log will index into
69 * domain string table and the bottom half will be the rid.
70 * Used for mapping ephemeral uid/gid during ACL setting to FUIDs
71 */
72typedef struct zfs_fuid {
73	list_node_t 	z_next;
74	uint64_t 	z_id;		/* uid/gid being converted to fuid */
75	uint64_t	z_domidx;	/* index in AVL domain table */
76	uint64_t	z_logfuid;	/* index for domain in log */
77} zfs_fuid_t;
78
79/* list of unique domains */
80typedef struct zfs_fuid_domain {
81	list_node_t	z_next;
82	uint64_t	z_domidx;	/* AVL tree idx */
83	const char	*z_domain;	/* domain string */
84} zfs_fuid_domain_t;
85
86/*
87 * FUID information necessary for logging create, setattr, and setacl.
88 */
89typedef struct zfs_fuid_info {
90	list_t	z_fuids;
91	list_t	z_domains;
92	uint64_t z_fuid_owner;
93	uint64_t z_fuid_group;
94	char **z_domain_table;  /* Used during replay */
95	uint32_t z_fuid_cnt;	/* How many fuids in z_fuids */
96	uint32_t z_domain_cnt;	/* How many domains */
97	size_t	z_domain_str_sz; /* len of domain strings z_domain list */
98} zfs_fuid_info_t;
99
100#ifdef _KERNEL
101struct znode;
102extern uid_t zfs_fuid_map_id(zfsvfs_t *, uint64_t, cred_t *, zfs_fuid_type_t);
103extern void zfs_fuid_node_add(zfs_fuid_info_t **, const char *, uint32_t,
104    uint64_t, uint64_t, zfs_fuid_type_t);
105extern void zfs_fuid_destroy(zfsvfs_t *);
106extern uint64_t zfs_fuid_create_cred(zfsvfs_t *, zfs_fuid_type_t,
107    cred_t *, zfs_fuid_info_t **);
108extern uint64_t zfs_fuid_create(zfsvfs_t *, uint64_t, cred_t *, zfs_fuid_type_t,
109    zfs_fuid_info_t **);
110extern void zfs_fuid_map_ids(struct znode *zp, cred_t *cr,
111    uid_t *uid, uid_t *gid);
112extern zfs_fuid_info_t *zfs_fuid_info_alloc(void);
113extern void zfs_fuid_info_free(zfs_fuid_info_t *);
114extern boolean_t zfs_groupmember(zfsvfs_t *, uint64_t, cred_t *);
115void zfs_fuid_sync(zfsvfs_t *, dmu_tx_t *);
116extern int zfs_fuid_find_by_domain(zfsvfs_t *, const char *domain,
117    char **retdomain, boolean_t addok);
118extern const char *zfs_fuid_find_by_idx(zfsvfs_t *zfsvfs, uint32_t idx);
119extern void zfs_fuid_txhold(zfsvfs_t *zfsvfs, dmu_tx_t *tx);
120#endif
121
122char *zfs_fuid_idx_domain(avl_tree_t *, uint32_t);
123void zfs_fuid_avl_tree_create(avl_tree_t *, avl_tree_t *);
124uint64_t zfs_fuid_table_load(objset_t *, uint64_t, avl_tree_t *, avl_tree_t *);
125void zfs_fuid_table_destroy(avl_tree_t *, avl_tree_t *);
126
127#ifdef	__cplusplus
128}
129#endif
130
131#endif	/* _SYS_FS_ZFS_FUID_H */
132