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OpenZFS 6314 - buffer overflow in dsl_dataset_name
[FreeBSD/FreeBSD.git] / include / sys / spa_impl.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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
25  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26  * Copyright (c) 2016 Actifio, Inc. All rights reserved.
27  */
28
29 #ifndef _SYS_SPA_IMPL_H
30 #define _SYS_SPA_IMPL_H
31
32 #include <sys/spa.h>
33 #include <sys/vdev.h>
34 #include <sys/metaslab.h>
35 #include <sys/dmu.h>
36 #include <sys/dsl_pool.h>
37 #include <sys/uberblock_impl.h>
38 #include <sys/zfs_context.h>
39 #include <sys/avl.h>
40 #include <sys/refcount.h>
41 #include <sys/bplist.h>
42 #include <sys/bpobj.h>
43 #include <sys/zfeature.h>
44 #include <zfeature_common.h>
45
46 #ifdef  __cplusplus
47 extern "C" {
48 #endif
49
50 typedef struct spa_error_entry {
51         zbookmark_phys_t        se_bookmark;
52         char                    *se_name;
53         avl_node_t              se_avl;
54 } spa_error_entry_t;
55
56 typedef struct spa_history_phys {
57         uint64_t sh_pool_create_len;    /* ending offset of zpool create */
58         uint64_t sh_phys_max_off;       /* physical EOF */
59         uint64_t sh_bof;                /* logical BOF */
60         uint64_t sh_eof;                /* logical EOF */
61         uint64_t sh_records_lost;       /* num of records overwritten */
62 } spa_history_phys_t;
63
64 struct spa_aux_vdev {
65         uint64_t        sav_object;             /* MOS object for device list */
66         nvlist_t        *sav_config;            /* cached device config */
67         vdev_t          **sav_vdevs;            /* devices */
68         int             sav_count;              /* number devices */
69         boolean_t       sav_sync;               /* sync the device list */
70         nvlist_t        **sav_pending;          /* pending device additions */
71         uint_t          sav_npending;           /* # pending devices */
72 };
73
74 typedef struct spa_config_lock {
75         kmutex_t        scl_lock;
76         kthread_t       *scl_writer;
77         int             scl_write_wanted;
78         kcondvar_t      scl_cv;
79         refcount_t      scl_count;
80 } spa_config_lock_t;
81
82 typedef struct spa_config_dirent {
83         list_node_t     scd_link;
84         char            *scd_path;
85 } spa_config_dirent_t;
86
87 typedef enum zio_taskq_type {
88         ZIO_TASKQ_ISSUE = 0,
89         ZIO_TASKQ_ISSUE_HIGH,
90         ZIO_TASKQ_INTERRUPT,
91         ZIO_TASKQ_INTERRUPT_HIGH,
92         ZIO_TASKQ_TYPES
93 } zio_taskq_type_t;
94
95 /*
96  * State machine for the zpool-poolname process.  The states transitions
97  * are done as follows:
98  *
99  *      From               To                   Routine
100  *      PROC_NONE       -> PROC_CREATED         spa_activate()
101  *      PROC_CREATED    -> PROC_ACTIVE          spa_thread()
102  *      PROC_ACTIVE     -> PROC_DEACTIVATE      spa_deactivate()
103  *      PROC_DEACTIVATE -> PROC_GONE            spa_thread()
104  *      PROC_GONE       -> PROC_NONE            spa_deactivate()
105  */
106 typedef enum spa_proc_state {
107         SPA_PROC_NONE,          /* spa_proc = &p0, no process created */
108         SPA_PROC_CREATED,       /* spa_activate() has proc, is waiting */
109         SPA_PROC_ACTIVE,        /* taskqs created, spa_proc set */
110         SPA_PROC_DEACTIVATE,    /* spa_deactivate() requests process exit */
111         SPA_PROC_GONE           /* spa_thread() is exiting, spa_proc = &p0 */
112 } spa_proc_state_t;
113
114 typedef struct spa_taskqs {
115         uint_t stqs_count;
116         taskq_t **stqs_taskq;
117 } spa_taskqs_t;
118
119 typedef enum spa_all_vdev_zap_action {
120         AVZ_ACTION_NONE = 0,
121         AVZ_ACTION_DESTROY,     /* Destroy all per-vdev ZAPs and the AVZ. */
122         AVZ_ACTION_REBUILD      /* Populate the new AVZ, see spa_avz_rebuild */
123 } spa_avz_action_t;
124
125 struct spa {
126         /*
127          * Fields protected by spa_namespace_lock.
128          */
129         char            spa_name[ZFS_MAX_DATASET_NAME_LEN];     /* pool name */
130         char            *spa_comment;           /* comment */
131         avl_node_t      spa_avl;                /* node in spa_namespace_avl */
132         nvlist_t        *spa_config;            /* last synced config */
133         nvlist_t        *spa_config_syncing;    /* currently syncing config */
134         nvlist_t        *spa_config_splitting;  /* config for splitting */
135         nvlist_t        *spa_load_info;         /* info and errors from load */
136         uint64_t        spa_config_txg;         /* txg of last config change */
137         int             spa_sync_pass;          /* iterate-to-convergence */
138         pool_state_t    spa_state;              /* pool state */
139         int             spa_inject_ref;         /* injection references */
140         uint8_t         spa_sync_on;            /* sync threads are running */
141         spa_load_state_t spa_load_state;        /* current load operation */
142         uint64_t        spa_import_flags;       /* import specific flags */
143         spa_taskqs_t    spa_zio_taskq[ZIO_TYPES][ZIO_TASKQ_TYPES];
144         dsl_pool_t      *spa_dsl_pool;
145         boolean_t       spa_is_initializing;    /* true while opening pool */
146         metaslab_class_t *spa_normal_class;     /* normal data class */
147         metaslab_class_t *spa_log_class;        /* intent log data class */
148         uint64_t        spa_first_txg;          /* first txg after spa_open() */
149         uint64_t        spa_final_txg;          /* txg of export/destroy */
150         uint64_t        spa_freeze_txg;         /* freeze pool at this txg */
151         uint64_t        spa_load_max_txg;       /* best initial ub_txg */
152         uint64_t        spa_claim_max_txg;      /* highest claimed birth txg */
153         timespec_t      spa_loaded_ts;          /* 1st successful open time */
154         objset_t        *spa_meta_objset;       /* copy of dp->dp_meta_objset */
155         kmutex_t        spa_evicting_os_lock;   /* Evicting objset list lock */
156         list_t          spa_evicting_os_list;   /* Objsets being evicted. */
157         kcondvar_t      spa_evicting_os_cv;     /* Objset Eviction Completion */
158         txg_list_t      spa_vdev_txg_list;      /* per-txg dirty vdev list */
159         vdev_t          *spa_root_vdev;         /* top-level vdev container */
160         int             spa_min_ashift;         /* of vdevs in normal class */
161         int             spa_max_ashift;         /* of vdevs in normal class */
162         uint64_t        spa_config_guid;        /* config pool guid */
163         uint64_t        spa_load_guid;          /* spa_load initialized guid */
164         uint64_t        spa_last_synced_guid;   /* last synced guid */
165         list_t          spa_config_dirty_list;  /* vdevs with dirty config */
166         list_t          spa_state_dirty_list;   /* vdevs with dirty state */
167         spa_aux_vdev_t  spa_spares;             /* hot spares */
168         spa_aux_vdev_t  spa_l2cache;            /* L2ARC cache devices */
169         nvlist_t        *spa_label_features;    /* Features for reading MOS */
170         uint64_t        spa_config_object;      /* MOS object for pool config */
171         uint64_t        spa_config_generation;  /* config generation number */
172         uint64_t        spa_syncing_txg;        /* txg currently syncing */
173         bpobj_t         spa_deferred_bpobj;     /* deferred-free bplist */
174         bplist_t        spa_free_bplist[TXG_SIZE]; /* bplist of stuff to free */
175         uberblock_t     spa_ubsync;             /* last synced uberblock */
176         uberblock_t     spa_uberblock;          /* current uberblock */
177         boolean_t       spa_extreme_rewind;     /* rewind past deferred frees */
178         uint64_t        spa_last_io;            /* lbolt of last non-scan I/O */
179         kmutex_t        spa_scrub_lock;         /* resilver/scrub lock */
180         uint64_t        spa_scrub_inflight;     /* in-flight scrub I/Os */
181         kcondvar_t      spa_scrub_io_cv;        /* scrub I/O completion */
182         uint8_t         spa_scrub_active;       /* active or suspended? */
183         uint8_t         spa_scrub_type;         /* type of scrub we're doing */
184         uint8_t         spa_scrub_finished;     /* indicator to rotate logs */
185         uint8_t         spa_scrub_started;      /* started since last boot */
186         uint8_t         spa_scrub_reopen;       /* scrub doing vdev_reopen */
187         uint64_t        spa_scan_pass_start;    /* start time per pass/reboot */
188         uint64_t        spa_scan_pass_exam;     /* examined bytes per pass */
189         kmutex_t        spa_async_lock;         /* protect async state */
190         kthread_t       *spa_async_thread;      /* thread doing async task */
191         int             spa_async_suspended;    /* async tasks suspended */
192         kcondvar_t      spa_async_cv;           /* wait for thread_exit() */
193         uint16_t        spa_async_tasks;        /* async task mask */
194         char            *spa_root;              /* alternate root directory */
195         uint64_t        spa_ena;                /* spa-wide ereport ENA */
196         int             spa_last_open_failed;   /* error if last open failed */
197         uint64_t        spa_last_ubsync_txg;    /* "best" uberblock txg */
198         uint64_t        spa_last_ubsync_txg_ts; /* timestamp from that ub */
199         uint64_t        spa_load_txg;           /* ub txg that loaded */
200         uint64_t        spa_load_txg_ts;        /* timestamp from that ub */
201         uint64_t        spa_load_meta_errors;   /* verify metadata err count */
202         uint64_t        spa_load_data_errors;   /* verify data err count */
203         uint64_t        spa_verify_min_txg;     /* start txg of verify scrub */
204         kmutex_t        spa_errlog_lock;        /* error log lock */
205         uint64_t        spa_errlog_last;        /* last error log object */
206         uint64_t        spa_errlog_scrub;       /* scrub error log object */
207         kmutex_t        spa_errlist_lock;       /* error list/ereport lock */
208         avl_tree_t      spa_errlist_last;       /* last error list */
209         avl_tree_t      spa_errlist_scrub;      /* scrub error list */
210         uint64_t        spa_deflate;            /* should we deflate? */
211         uint64_t        spa_history;            /* history object */
212         kmutex_t        spa_history_lock;       /* history lock */
213         vdev_t          *spa_pending_vdev;      /* pending vdev additions */
214         kmutex_t        spa_props_lock;         /* property lock */
215         uint64_t        spa_pool_props_object;  /* object for properties */
216         uint64_t        spa_bootfs;             /* default boot filesystem */
217         uint64_t        spa_failmode;           /* failure mode for the pool */
218         uint64_t        spa_delegation;         /* delegation on/off */
219         list_t          spa_config_list;        /* previous cache file(s) */
220         /* per-CPU array of root of async I/O: */
221         zio_t           **spa_async_zio_root;
222         zio_t           *spa_suspend_zio_root;  /* root of all suspended I/O */
223         kmutex_t        spa_suspend_lock;       /* protects suspend_zio_root */
224         kcondvar_t      spa_suspend_cv;         /* notification of resume */
225         uint8_t         spa_suspended;          /* pool is suspended */
226         uint8_t         spa_claiming;           /* pool is doing zil_claim() */
227         boolean_t       spa_debug;              /* debug enabled? */
228         boolean_t       spa_is_root;            /* pool is root */
229         int             spa_minref;             /* num refs when first opened */
230         int             spa_mode;               /* FREAD | FWRITE */
231         spa_log_state_t spa_log_state;          /* log state */
232         uint64_t        spa_autoexpand;         /* lun expansion on/off */
233         ddt_t           *spa_ddt[ZIO_CHECKSUM_FUNCTIONS]; /* in-core DDTs */
234         uint64_t        spa_ddt_stat_object;    /* DDT statistics */
235         uint64_t        spa_dedup_ditto;        /* dedup ditto threshold */
236         uint64_t        spa_dedup_checksum;     /* default dedup checksum */
237         uint64_t        spa_dspace;             /* dspace in normal class */
238         kmutex_t        spa_vdev_top_lock;      /* dueling offline/remove */
239         kmutex_t        spa_proc_lock;          /* protects spa_proc* */
240         kcondvar_t      spa_proc_cv;            /* spa_proc_state transitions */
241         spa_proc_state_t spa_proc_state;        /* see definition */
242         proc_t          *spa_proc;              /* "zpool-poolname" process */
243         uint64_t        spa_did;                /* if procp != p0, did of t1 */
244         boolean_t       spa_autoreplace;        /* autoreplace set in open */
245         int             spa_vdev_locks;         /* locks grabbed */
246         uint64_t        spa_creation_version;   /* version at pool creation */
247         uint64_t        spa_prev_software_version; /* See ub_software_version */
248         uint64_t        spa_feat_for_write_obj; /* required to write to pool */
249         uint64_t        spa_feat_for_read_obj;  /* required to read from pool */
250         uint64_t        spa_feat_desc_obj;      /* Feature descriptions */
251         uint64_t        spa_feat_enabled_txg_obj; /* Feature enabled txg */
252         kmutex_t        spa_feat_stats_lock;    /* protects spa_feat_stats */
253         nvlist_t        *spa_feat_stats;        /* Cache of enabled features */
254         /* cache feature refcounts */
255         uint64_t        spa_feat_refcount_cache[SPA_FEATURES];
256         taskqid_t       spa_deadman_tqid;       /* Task id */
257         uint64_t        spa_deadman_calls;      /* number of deadman calls */
258         hrtime_t        spa_sync_starttime;     /* starting time of spa_sync */
259         uint64_t        spa_deadman_synctime;   /* deadman expiration timer */
260         uint64_t        spa_all_vdev_zaps;      /* ZAP of per-vd ZAP obj #s */
261         spa_avz_action_t        spa_avz_action; /* destroy/rebuild AVZ? */
262         uint64_t        spa_errata;             /* errata issues detected */
263         spa_stats_t     spa_stats;              /* assorted spa statistics */
264         hrtime_t        spa_ccw_fail_time;      /* Conf cache write fail time */
265         taskq_t         *spa_zvol_taskq;        /* Taskq for minor managment */
266
267         /*
268          * spa_refcount & spa_config_lock must be the last elements
269          * because refcount_t changes size based on compilation options.
270          * In order for the MDB module to function correctly, the other
271          * fields must remain in the same location.
272          */
273         spa_config_lock_t spa_config_lock[SCL_LOCKS]; /* config changes */
274         refcount_t      spa_refcount;           /* number of opens */
275 };
276
277 extern char *spa_config_path;
278
279 extern void spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
280     task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent);
281 extern void spa_taskq_dispatch_sync(spa_t *, zio_type_t t, zio_taskq_type_t q,
282     task_func_t *func, void *arg, uint_t flags);
283
284
285 #ifdef  __cplusplus
286 }
287 #endif
288
289 #endif  /* _SYS_SPA_IMPL_H */