FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/dsl_dir.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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
     * Copyright (c) 2014, Joyent, Inc. All rights reserved.
     * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
     */
    
    #ifndef _SYS_DSL_DIR_H
    #define _SYS_DSL_DIR_H
    
    #include <sys/dmu.h>
    #include <sys/dsl_deadlist.h>
    #include <sys/dsl_pool.h>
    #include <sys/dsl_synctask.h>
    #include <sys/zfs_refcount.h>
    #include <sys/zfs_context.h>
    #include <sys/dsl_crypt.h>
    #include <sys/bplist.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    struct dsl_dataset;
    struct zthr;
    /*
     * DD_FIELD_* are strings that are used in the "extensified" dsl_dir zap object.
     * They should be of the format <reverse-dns>:<field>.
     */
    
    #define DD_FIELD_FILESYSTEM_COUNT       "com.joyent:filesystem_count"
    #define DD_FIELD_SNAPSHOT_COUNT         "com.joyent:snapshot_count"
    #define DD_FIELD_CRYPTO_KEY_OBJ         "com.datto:crypto_key_obj"
    #define DD_FIELD_LIVELIST               "com.delphix:livelist"
    #define DD_FIELD_SNAPSHOTS_CHANGED      "com.ixsystems:snapshots_changed"
    
    typedef enum dd_used {
            DD_USED_HEAD,
            DD_USED_SNAP,
            DD_USED_CHILD,
            DD_USED_CHILD_RSRV,
            DD_USED_REFRSRV,
            DD_USED_NUM
    } dd_used_t;
    
    #define DD_FLAG_USED_BREAKDOWN (1<<0)
    
    typedef struct dsl_dir_phys {
            uint64_t dd_creation_time; /* not actually used */
            uint64_t dd_head_dataset_obj;
            uint64_t dd_parent_obj;
            uint64_t dd_origin_obj;
            uint64_t dd_child_dir_zapobj;
            /*
             * how much space our children are accounting for; for leaf
             * datasets, == physical space used by fs + snaps
             */
            uint64_t dd_used_bytes;
            uint64_t dd_compressed_bytes;
            uint64_t dd_uncompressed_bytes;
            /* Administrative quota setting */
            uint64_t dd_quota;
            /* Administrative reservation setting */
            uint64_t dd_reserved;
            uint64_t dd_props_zapobj;
            uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
            uint64_t dd_flags;
            uint64_t dd_used_breakdown[DD_USED_NUM];
            uint64_t dd_clones; /* dsl_dir objects */
            uint64_t dd_pad[13]; /* pad out to 256 bytes for good measure */
    } dsl_dir_phys_t;
    
    struct dsl_dir {
            dmu_buf_user_t dd_dbu;
    
            /* These are immutable; no lock needed: */
            uint64_t dd_object;
            uint64_t dd_crypto_obj;
            dsl_pool_t *dd_pool;
   
           /* Stable until user eviction; no lock needed: */
           dmu_buf_t *dd_dbuf;
   
           /* protected by lock on pool's dp_dirty_dirs list */
           txg_node_t dd_dirty_link;
   
           /* protected by dp_config_rwlock */
           dsl_dir_t *dd_parent;
   
           /* Protected by dd_lock */
           kmutex_t dd_lock;
           list_t dd_props; /* list of dsl_prop_record_t's */
           inode_timespec_t dd_snap_cmtime; /* last snapshot namespace change */
           uint64_t dd_origin_txg;
   
           /* gross estimate of space used by in-flight tx's */
           uint64_t dd_tempreserved[TXG_SIZE];
           /* amount of space we expect to write; == amount of dirty data */
           uint64_t dd_space_towrite[TXG_SIZE];
   
           dsl_deadlist_t dd_livelist;
           bplist_t dd_pending_frees;
           bplist_t dd_pending_allocs;
   
           kmutex_t dd_activity_lock;
           kcondvar_t dd_activity_cv;
           boolean_t dd_activity_cancelled;
           uint64_t dd_activity_waiters;
   
           /* protected by dd_lock; keep at end of struct for better locality */
           char dd_myname[ZFS_MAX_DATASET_NAME_LEN];
   };
   
   static inline dsl_dir_phys_t *
   dsl_dir_phys(dsl_dir_t *dd)
   {
           return (dd->dd_dbuf->db_data);
   }
   
   void dsl_dir_rele(dsl_dir_t *dd, const void *tag);
   void dsl_dir_async_rele(dsl_dir_t *dd, const void *tag);
   int dsl_dir_hold(dsl_pool_t *dp, const char *name, const void *tag,
       dsl_dir_t **, const char **tail);
   int dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
       const char *tail, const void *tag, dsl_dir_t **);
   void dsl_dir_name(dsl_dir_t *dd, char *buf);
   int dsl_dir_namelen(dsl_dir_t *dd);
   uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds,
       const char *name, dmu_tx_t *tx);
   
   uint64_t dsl_dir_get_used(dsl_dir_t *dd);
   uint64_t dsl_dir_get_compressed(dsl_dir_t *dd);
   uint64_t dsl_dir_get_quota(dsl_dir_t *dd);
   uint64_t dsl_dir_get_reservation(dsl_dir_t *dd);
   uint64_t dsl_dir_get_compressratio(dsl_dir_t *dd);
   uint64_t dsl_dir_get_logicalused(dsl_dir_t *dd);
   uint64_t dsl_dir_get_usedsnap(dsl_dir_t *dd);
   uint64_t dsl_dir_get_usedds(dsl_dir_t *dd);
   uint64_t dsl_dir_get_usedrefreserv(dsl_dir_t *dd);
   uint64_t dsl_dir_get_usedchild(dsl_dir_t *dd);
   void dsl_dir_get_origin(dsl_dir_t *dd, char *buf);
   int dsl_dir_get_filesystem_count(dsl_dir_t *dd, uint64_t *count);
   int dsl_dir_get_snapshot_count(dsl_dir_t *dd, uint64_t *count);
   
   void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv);
   uint64_t dsl_dir_space_available(dsl_dir_t *dd,
       dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
   void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx);
   void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx);
   int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
       uint64_t asize, boolean_t netfree, void **tr_cookiep, dmu_tx_t *tx);
   void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx);
   void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx);
   void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
       int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
   void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
       dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
   void dsl_dir_diduse_transfer_space(dsl_dir_t *dd, int64_t used,
       int64_t compressed, int64_t uncompressed, int64_t tonew,
       dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
   int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
       uint64_t quota);
   int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
       uint64_t reservation);
   int dsl_dir_activate_fs_ss_limit(const char *);
   int dsl_fs_ss_limit_check(dsl_dir_t *, uint64_t, zfs_prop_t, dsl_dir_t *,
       cred_t *, proc_t *);
   void dsl_fs_ss_count_adjust(dsl_dir_t *, int64_t, const char *, dmu_tx_t *);
   int dsl_dir_rename(const char *oldname, const char *newname);
   int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
       uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *, proc_t *);
   boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
   void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
       uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
   void dsl_dir_snap_cmtime_update(dsl_dir_t *dd, dmu_tx_t *tx);
   inode_timespec_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
   void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
       dmu_tx_t *tx);
   void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);
   boolean_t dsl_dir_is_zapified(dsl_dir_t *dd);
   void dsl_dir_livelist_open(dsl_dir_t *dd, uint64_t obj);
   void dsl_dir_livelist_close(dsl_dir_t *dd);
   void dsl_dir_remove_livelist(dsl_dir_t *dd, dmu_tx_t *tx, boolean_t total);
   int dsl_dir_wait(dsl_dir_t *dd, dsl_dataset_t *ds, zfs_wait_activity_t activity,
       boolean_t *waited);
   void dsl_dir_cancel_waiters(dsl_dir_t *dd);
   
   /* internal reserved dir name */
   #define MOS_DIR_NAME "$MOS"
   #define ORIGIN_DIR_NAME "$ORIGIN"
   #define FREE_DIR_NAME "$FREE"
   #define LEAK_DIR_NAME "$LEAK"
   
   #ifdef ZFS_DEBUG
   #define dprintf_dd(dd, fmt, ...) do { \
           if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
           char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
           dsl_dir_name(dd, __ds_name); \
           dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
           kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
           } \
   } while (0)
   #else
   #define dprintf_dd(dd, fmt, ...)
   #endif
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif /* _SYS_DSL_DIR_H */

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