zfs/include/sys/zfs_fuid.h

   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 #include <sys/list.h>
  37
  38 #ifdef  __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 typedef enum {
  43         ZFS_OWNER,
  44         ZFS_GROUP,
  45         ZFS_ACE_USER,
  46         ZFS_ACE_GROUP
  47 } zfs_fuid_type_t;
  48
  49 /*
  50  * Estimate space needed for one more fuid table entry.
  51  * for now assume its current size + 1K
  52  */
  53 #define FUID_SIZE_ESTIMATE(z) ((z)->z_fuid_size + (SPA_MINBLOCKSIZE << 1))
  54
  55 #define FUID_INDEX(x)   ((x) >> 32)
  56 #define FUID_RID(x)     ((x) & 0xffffffff)
  57 #define FUID_ENCODE(idx, rid) (((uint64_t)(idx) << 32) | (rid))
  58 /*
  59  * FUIDs cause problems for the intent log
  60  * we need to replay the creation of the FUID,
  61  * but we can't count on the idmapper to be around
  62  * and during replay the FUID index may be different than
  63  * before.  Also, if an ACL has 100 ACEs and 12 different
  64  * domains we don't want to log 100 domain strings, but rather
  65  * just the unique 12.
  66  */
  67
  68 /*
  69  * The FUIDs in the log will index into
  70  * domain string table and the bottom half will be the rid.
  71  * Used for mapping ephemeral uid/gid during ACL setting to FUIDs
  72  */
  73 typedef struct zfs_fuid {
  74         list_node_t     z_next;
  75         uint64_t        z_id;           /* uid/gid being converted to fuid */
  76         uint64_t        z_domidx;       /* index in AVL domain table */
  77         uint64_t        z_logfuid;      /* index for domain in log */
  78 } zfs_fuid_t;
  79
  80 /* list of unique domains */
  81 typedef struct zfs_fuid_domain {
  82         list_node_t     z_next;
  83         uint64_t        z_domidx;       /* AVL tree idx */
  84         const char      *z_domain;      /* domain string */
  85 } zfs_fuid_domain_t;
  86
  87 /*
  88  * FUID information necessary for logging create, setattr, and setacl.
  89  */
  90 typedef struct zfs_fuid_info {
  91         list_t  z_fuids;
  92         list_t  z_domains;
  93         uint64_t z_fuid_owner;
  94         uint64_t z_fuid_group;
  95         char **z_domain_table;  /* Used during replay */
  96         uint32_t z_fuid_cnt;    /* How many fuids in z_fuids */
  97         uint32_t z_domain_cnt;  /* How many domains */
  98         size_t  z_domain_str_sz; /* len of domain strings z_domain list */
  99 } zfs_fuid_info_t;
 100
 101 #ifdef _KERNEL
 102 struct znode;
 103 extern uid_t zfs_fuid_map_id(zfs_sb_t *, uint64_t, cred_t *, zfs_fuid_type_t);
 104 extern void zfs_fuid_node_add(zfs_fuid_info_t **, const char *, uint32_t,
 105     uint64_t, uint64_t, zfs_fuid_type_t);
 106 extern void zfs_fuid_destroy(zfs_sb_t *);
 107 extern uint64_t zfs_fuid_create_cred(zfs_sb_t *, zfs_fuid_type_t,
 108     cred_t *, zfs_fuid_info_t **);
 109 extern uint64_t zfs_fuid_create(zfs_sb_t *, uint64_t, cred_t *, zfs_fuid_type_t,
 110     zfs_fuid_info_t **);
 111 extern void zfs_fuid_map_ids(struct znode *zp, cred_t *cr,
 112     uid_t *uid, uid_t *gid);
 113 extern zfs_fuid_info_t *zfs_fuid_info_alloc(void);
 114 extern void zfs_fuid_info_free(zfs_fuid_info_t *);
 115 extern boolean_t zfs_groupmember(zfs_sb_t *, uint64_t, cred_t *);
 116 void zfs_fuid_sync(zfs_sb_t *, dmu_tx_t *);
 117 extern int zfs_fuid_find_by_domain(zfs_sb_t *, const char *domain,
 118     char **retdomain, boolean_t addok);
 119 extern const char *zfs_fuid_find_by_idx(zfs_sb_t *zsb, uint32_t idx);
 120 extern void zfs_fuid_txhold(zfs_sb_t *zsb, dmu_tx_t *tx);
 121 #endif
 122
 123 char *zfs_fuid_idx_domain(avl_tree_t *, uint32_t);
 124 void zfs_fuid_avl_tree_create(avl_tree_t *, avl_tree_t *);
 125 uint64_t zfs_fuid_table_load(objset_t *, uint64_t, avl_tree_t *, avl_tree_t *);
 126 void zfs_fuid_table_destroy(avl_tree_t *, avl_tree_t *);
 127
 128 #ifdef  __cplusplus
 129 }
 130 #endif
 131
 132 #endif  /* _SYS_FS_ZFS_FUID_H */