FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zfs_fuid.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #ifndef _SYS_FS_ZFS_FUID_H
    #define _SYS_FS_ZFS_FUID_H
    
    #ifdef _KERNEL
    #include <sys/sid.h>
    #include <sys/dmu.h>
    #include <sys/zfs_vfsops.h>
    #endif
    #include <sys/avl.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    typedef enum {
            ZFS_OWNER,
            ZFS_GROUP,
            ZFS_ACE_USER,
            ZFS_ACE_GROUP
    } zfs_fuid_type_t;
    
    /*
     * Estimate space needed for one more fuid table entry.
     * for now assume its current size + 1K
     */
    #define FUID_SIZE_ESTIMATE(z) ((z)->z_fuid_size + (SPA_MINBLOCKSIZE << 1))
    
    #define FUID_INDEX(x)   ((x) >> 32)
    #define FUID_RID(x)     ((x) & 0xffffffff)
    #define FUID_ENCODE(idx, rid) (((uint64_t)(idx) << 32) | (rid))
    /*
     * FUIDs cause problems for the intent log
     * we need to replay the creation of the FUID,
     * but we can't count on the idmapper to be around
     * and during replay the FUID index may be different than
     * before.  Also, if an ACL has 100 ACEs and 12 different
     * domains we don't want to log 100 domain strings, but rather
     * just the unique 12.
     */
    
    /*
     * The FUIDs in the log will index into
     * domain string table and the bottom half will be the rid.
     * Used for mapping ephemeral uid/gid during ACL setting to FUIDs
     */
    typedef struct zfs_fuid {
            list_node_t     z_next;
            uint64_t        z_id;           /* uid/gid being converted to fuid */
            uint64_t        z_domidx;       /* index in AVL domain table */
            uint64_t        z_logfuid;      /* index for domain in log */
    } zfs_fuid_t;
    
    /* list of unique domains */
    typedef struct zfs_fuid_domain {
            list_node_t     z_next;
            uint64_t        z_domidx;       /* AVL tree idx */
            const char      *z_domain;      /* domain string */
    } zfs_fuid_domain_t;
    
    /*
     * FUID information necessary for logging create, setattr, and setacl.
     */
    typedef struct zfs_fuid_info {
            list_t  z_fuids;
            list_t  z_domains;
            uint64_t z_fuid_owner;
            uint64_t z_fuid_group;
            char **z_domain_table;  /* Used during replay */
            uint32_t z_fuid_cnt;    /* How many fuids in z_fuids */
            uint32_t z_domain_cnt;  /* How many domains */
            size_t  z_domain_str_sz; /* len of domain strings z_domain list */
    } zfs_fuid_info_t;
    
    #ifdef _KERNEL
   struct znode;
   extern uid_t zfs_fuid_map_id(zfsvfs_t *, uint64_t, cred_t *, zfs_fuid_type_t);
   extern void zfs_fuid_node_add(zfs_fuid_info_t **, const char *, uint32_t,
       uint64_t, uint64_t, zfs_fuid_type_t);
   extern void zfs_fuid_destroy(zfsvfs_t *);
   extern uint64_t zfs_fuid_create_cred(zfsvfs_t *, zfs_fuid_type_t,
       cred_t *, zfs_fuid_info_t **);
   extern uint64_t zfs_fuid_create(zfsvfs_t *, uint64_t, cred_t *, zfs_fuid_type_t,
       zfs_fuid_info_t **);
   extern void zfs_fuid_map_ids(struct znode *zp, cred_t *cr,
       uid_t *uid, uid_t *gid);
   extern zfs_fuid_info_t *zfs_fuid_info_alloc(void);
   extern void zfs_fuid_info_free(zfs_fuid_info_t *);
   extern boolean_t zfs_groupmember(zfsvfs_t *, uint64_t, cred_t *);
   void zfs_fuid_sync(zfsvfs_t *, dmu_tx_t *);
   extern const char *zfs_fuid_find_by_idx(zfsvfs_t *zfsvfs, uint32_t idx);
   extern void zfs_fuid_txhold(zfsvfs_t *zfsvfs, dmu_tx_t *tx);
   extern int zfs_id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid,
       char *buf, size_t len, boolean_t addok);
   #endif
   
   const char *zfs_fuid_idx_domain(avl_tree_t *, uint32_t);
   void zfs_fuid_avl_tree_create(avl_tree_t *, avl_tree_t *);
   uint64_t zfs_fuid_table_load(objset_t *, uint64_t, avl_tree_t *, avl_tree_t *);
   void zfs_fuid_table_destroy(avl_tree_t *, avl_tree_t *);
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_FS_ZFS_FUID_H */

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