sys/geom/raid/g_raid.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef _G_RAID_H_
  30 #define _G_RAID_H_
  31
  32 #include <sys/param.h>
  33 #include <sys/kobj.h>
  34 #include <sys/bio.h>
  35 #include <sys/time.h>
  36 #ifdef _KERNEL
  37 #include <sys/sysctl.h>
  38 #endif
  39
  40 #define G_RAID_CLASS_NAME       "RAID"
  41
  42 #define G_RAID_MAGIC            "GEOM::RAID"
  43
  44 #define G_RAID_VERSION          0
  45
  46 struct g_raid_md_object;
  47 struct g_raid_tr_object;
  48
  49 #define G_RAID_DEVICE_FLAG_NOAUTOSYNC   0x0000000000000001ULL
  50 #define G_RAID_DEVICE_FLAG_NOFAILSYNC   0x0000000000000002ULL
  51 #define G_RAID_DEVICE_FLAG_MASK (G_RAID_DEVICE_FLAG_NOAUTOSYNC | \
  52                                          G_RAID_DEVICE_FLAG_NOFAILSYNC)
  53
  54 #ifdef _KERNEL
  55 extern u_int g_raid_aggressive_spare;
  56 extern u_int g_raid_debug;
  57 extern int g_raid_enable;
  58 extern int g_raid_read_err_thresh;
  59 extern u_int g_raid_start_timeout;
  60 extern struct g_class g_raid_class;
  61
  62 #define G_RAID_DEBUG(lvl, ...) \
  63     _GEOM_DEBUG("GEOM_RAID", g_raid_debug, (lvl), NULL, __VA_ARGS__)
  64 #define G_RAID_DEBUG1(lvl, sc, fmt, ...)                                \
  65     _GEOM_DEBUG("GEOM_RAID", g_raid_debug, (lvl), NULL, "%s: " fmt,     \
  66         (sc)->sc_name, ## __VA_ARGS__)
  67 #define G_RAID_LOGREQ(lvl, bp, ...) \
  68     _GEOM_DEBUG("GEOM_RAID", g_raid_debug, (lvl), (bp), __VA_ARGS__)
  69
  70 /*
  71  * Flags we use to distinguish I/O initiated by the TR layer to maintain
  72  * the volume's characteristics, fix subdisks, extra copies of data, etc.
  73  *
  74  * G_RAID_BIO_FLAG_SYNC         I/O to update an extra copy of the data
  75  *                              for RAID volumes that maintain extra data
  76  *                              and need to rebuild that data.
  77  * G_RAID_BIO_FLAG_REMAP        I/O done to try to provoke a subdisk into
  78  *                              doing some desirable action such as bad
  79  *                              block remapping after we detect a bad part
  80  *                              of the disk.
  81  * G_RAID_BIO_FLAG_LOCKED       I/O holds range lock that should re released.
  82  *
  83  * and the following meta item:
  84  * G_RAID_BIO_FLAG_SPECIAL      And of the I/O flags that need to make it
  85  *                              through the range locking which would
  86  *                              otherwise defer the I/O until after that
  87  *                              range is unlocked.
  88  */
  89 #define G_RAID_BIO_FLAG_SYNC            0x01
  90 #define G_RAID_BIO_FLAG_REMAP           0x02
  91 #define G_RAID_BIO_FLAG_SPECIAL \
  92                 (G_RAID_BIO_FLAG_SYNC|G_RAID_BIO_FLAG_REMAP)
  93 #define G_RAID_BIO_FLAG_LOCKED          0x80
  94
  95 struct g_raid_lock {
  96         off_t                    l_offset;
  97         off_t                    l_length;
  98         void                    *l_callback_arg;
  99         int                      l_pending;
 100         LIST_ENTRY(g_raid_lock)  l_next;
 101 };
 102
 103 #define G_RAID_EVENT_WAIT       0x01
 104 #define G_RAID_EVENT_VOLUME     0x02
 105 #define G_RAID_EVENT_SUBDISK    0x04
 106 #define G_RAID_EVENT_DISK       0x08
 107 #define G_RAID_EVENT_DONE       0x10
 108 struct g_raid_event {
 109         void                    *e_tgt;
 110         int                      e_event;
 111         int                      e_flags;
 112         int                      e_error;
 113         TAILQ_ENTRY(g_raid_event) e_next;
 114 };
 115 #define G_RAID_DISK_S_NONE              0x00    /* State is unknown. */
 116 #define G_RAID_DISK_S_OFFLINE           0x01    /* Missing disk placeholder. */
 117 #define G_RAID_DISK_S_DISABLED          0x02    /* Disabled. */
 118 #define G_RAID_DISK_S_FAILED            0x03    /* Failed. */
 119 #define G_RAID_DISK_S_STALE_FAILED      0x04    /* Old failed. */
 120 #define G_RAID_DISK_S_SPARE             0x05    /* Hot-spare. */
 121 #define G_RAID_DISK_S_STALE             0x06    /* Old disk, unused now. */
 122 #define G_RAID_DISK_S_ACTIVE            0x07    /* Operational. */
 123
 124 #define G_RAID_DISK_E_DISCONNECTED      0x01
 125
 126 struct g_raid_disk {
 127         struct g_raid_softc     *d_softc;       /* Back-pointer to softc. */
 128         struct g_consumer       *d_consumer;    /* GEOM disk consumer. */
 129         void                    *d_md_data;     /* Disk's metadata storage. */
 130         int                      d_candelete;   /* BIO_DELETE supported. */
 131         uint64_t                 d_flags;       /* Additional flags. */
 132         u_int                    d_state;       /* Disk state. */
 133         u_int                    d_load;        /* Disk average load. */
 134         off_t                    d_last_offset; /* Last head offset. */
 135         int                      d_read_errs;   /* Count of the read errors */
 136         TAILQ_HEAD(, g_raid_subdisk)     d_subdisks; /* List of subdisks. */
 137         TAILQ_ENTRY(g_raid_disk)         d_next;        /* Next disk in the node. */
 138         struct g_kerneldump      d_kd;          /* Kernel dumping method/args. */
 139 };
 140
 141 #define G_RAID_SUBDISK_S_NONE           0x00    /* Absent. */
 142 #define G_RAID_SUBDISK_S_FAILED         0x01    /* Failed. */
 143 #define G_RAID_SUBDISK_S_NEW            0x02    /* Blank. */
 144 #define G_RAID_SUBDISK_S_REBUILD        0x03    /* Blank + rebuild. */
 145 #define G_RAID_SUBDISK_S_UNINITIALIZED  0x04    /* Disk of the new volume. */
 146 #define G_RAID_SUBDISK_S_STALE          0x05    /* Dirty. */
 147 #define G_RAID_SUBDISK_S_RESYNC         0x06    /* Dirty + check/repair. */
 148 #define G_RAID_SUBDISK_S_ACTIVE         0x07    /* Usable. */
 149
 150 #define G_RAID_SUBDISK_E_NEW            0x01    /* A new subdisk has arrived */
 151 #define G_RAID_SUBDISK_E_FAILED         0x02    /* A subdisk failed, but remains in volume */
 152 #define G_RAID_SUBDISK_E_DISCONNECTED   0x03    /* A subdisk removed from volume. */
 153 #define G_RAID_SUBDISK_E_FIRST_TR_PRIVATE 0x80  /* translation private events */
 154
 155 #define G_RAID_SUBDISK_POS(sd)                                          \
 156     ((sd)->sd_disk ? ((sd)->sd_disk->d_last_offset - (sd)->sd_offset) : 0)
 157 #define G_RAID_SUBDISK_TRACK_SIZE       (1 * 1024 * 1024)
 158 #define G_RAID_SUBDISK_LOAD(sd)                                         \
 159     ((sd)->sd_disk ? ((sd)->sd_disk->d_load) : 0)
 160 #define G_RAID_SUBDISK_LOAD_SCALE       256
 161
 162 struct g_raid_subdisk {
 163         struct g_raid_softc     *sd_softc;      /* Back-pointer to softc. */
 164         struct g_raid_disk      *sd_disk;       /* Where this subdisk lives. */
 165         struct g_raid_volume    *sd_volume;     /* Volume, sd is a part of. */
 166         off_t                    sd_offset;     /* Offset on the disk. */
 167         off_t                    sd_size;       /* Size on the disk. */
 168         u_int                    sd_pos;        /* Position in volume. */
 169         u_int                    sd_state;      /* Subdisk state. */
 170         off_t                    sd_rebuild_pos; /* Rebuild position. */
 171         int                      sd_recovery;   /* Count of recovery reqs. */
 172         TAILQ_ENTRY(g_raid_subdisk)      sd_next; /* Next subdisk on disk. */
 173 };
 174
 175 #define G_RAID_MAX_SUBDISKS     16
 176 #define G_RAID_MAX_VOLUMENAME   32
 177
 178 #define G_RAID_VOLUME_S_STARTING        0x00
 179 #define G_RAID_VOLUME_S_BROKEN          0x01
 180 #define G_RAID_VOLUME_S_DEGRADED        0x02
 181 #define G_RAID_VOLUME_S_SUBOPTIMAL      0x03
 182 #define G_RAID_VOLUME_S_OPTIMAL         0x04
 183 #define G_RAID_VOLUME_S_UNSUPPORTED     0x05
 184 #define G_RAID_VOLUME_S_STOPPED         0x06
 185
 186 #define G_RAID_VOLUME_S_ALIVE(s)                        \
 187     ((s) == G_RAID_VOLUME_S_DEGRADED ||                 \
 188      (s) == G_RAID_VOLUME_S_SUBOPTIMAL ||               \
 189      (s) == G_RAID_VOLUME_S_OPTIMAL)
 190
 191 #define G_RAID_VOLUME_E_DOWN            0x00
 192 #define G_RAID_VOLUME_E_UP              0x01
 193 #define G_RAID_VOLUME_E_START           0x10
 194 #define G_RAID_VOLUME_E_STARTMD         0x11
 195
 196 #define G_RAID_VOLUME_RL_RAID0          0x00
 197 #define G_RAID_VOLUME_RL_RAID1          0x01
 198 #define G_RAID_VOLUME_RL_RAID3          0x03
 199 #define G_RAID_VOLUME_RL_RAID4          0x04
 200 #define G_RAID_VOLUME_RL_RAID5          0x05
 201 #define G_RAID_VOLUME_RL_RAID6          0x06
 202 #define G_RAID_VOLUME_RL_RAIDMDF        0x07
 203 #define G_RAID_VOLUME_RL_RAID1E         0x11
 204 #define G_RAID_VOLUME_RL_SINGLE         0x0f
 205 #define G_RAID_VOLUME_RL_CONCAT         0x1f
 206 #define G_RAID_VOLUME_RL_RAID5E         0x15
 207 #define G_RAID_VOLUME_RL_RAID5EE        0x25
 208 #define G_RAID_VOLUME_RL_RAID5R         0x35
 209 #define G_RAID_VOLUME_RL_UNKNOWN        0xff
 210
 211 #define G_RAID_VOLUME_RLQ_NONE          0x00
 212 #define G_RAID_VOLUME_RLQ_R1SM          0x00
 213 #define G_RAID_VOLUME_RLQ_R1MM          0x01
 214 #define G_RAID_VOLUME_RLQ_R3P0          0x00
 215 #define G_RAID_VOLUME_RLQ_R3PN          0x01
 216 #define G_RAID_VOLUME_RLQ_R4P0          0x00
 217 #define G_RAID_VOLUME_RLQ_R4PN          0x01
 218 #define G_RAID_VOLUME_RLQ_R5RA          0x00
 219 #define G_RAID_VOLUME_RLQ_R5RS          0x01
 220 #define G_RAID_VOLUME_RLQ_R5LA          0x02
 221 #define G_RAID_VOLUME_RLQ_R5LS          0x03
 222 #define G_RAID_VOLUME_RLQ_R6RA          0x00
 223 #define G_RAID_VOLUME_RLQ_R6RS          0x01
 224 #define G_RAID_VOLUME_RLQ_R6LA          0x02
 225 #define G_RAID_VOLUME_RLQ_R6LS          0x03
 226 #define G_RAID_VOLUME_RLQ_RMDFRA        0x00
 227 #define G_RAID_VOLUME_RLQ_RMDFRS        0x01
 228 #define G_RAID_VOLUME_RLQ_RMDFLA        0x02
 229 #define G_RAID_VOLUME_RLQ_RMDFLS        0x03
 230 #define G_RAID_VOLUME_RLQ_R1EA          0x00
 231 #define G_RAID_VOLUME_RLQ_R1EO          0x01
 232 #define G_RAID_VOLUME_RLQ_R5ERA         0x00
 233 #define G_RAID_VOLUME_RLQ_R5ERS         0x01
 234 #define G_RAID_VOLUME_RLQ_R5ELA         0x02
 235 #define G_RAID_VOLUME_RLQ_R5ELS         0x03
 236 #define G_RAID_VOLUME_RLQ_R5EERA        0x00
 237 #define G_RAID_VOLUME_RLQ_R5EERS        0x01
 238 #define G_RAID_VOLUME_RLQ_R5EELA        0x02
 239 #define G_RAID_VOLUME_RLQ_R5EELS        0x03
 240 #define G_RAID_VOLUME_RLQ_R5RRA         0x00
 241 #define G_RAID_VOLUME_RLQ_R5RRS         0x01
 242 #define G_RAID_VOLUME_RLQ_R5RLA         0x02
 243 #define G_RAID_VOLUME_RLQ_R5RLS         0x03
 244 #define G_RAID_VOLUME_RLQ_UNKNOWN       0xff
 245
 246 struct g_raid_volume;
 247
 248 struct g_raid_volume {
 249         struct g_raid_softc     *v_softc;       /* Back-pointer to softc. */
 250         struct g_provider       *v_provider;    /* GEOM provider. */
 251         struct g_raid_subdisk    v_subdisks[G_RAID_MAX_SUBDISKS];
 252                                                 /* Subdisks of this volume. */
 253         void                    *v_md_data;     /* Volume's metadata storage. */
 254         struct g_raid_tr_object *v_tr;          /* Transformation object. */
 255         char                     v_name[G_RAID_MAX_VOLUMENAME];
 256                                                 /* Volume name. */
 257         u_int                    v_state;       /* Volume state. */
 258         u_int                    v_raid_level;  /* Array RAID level. */
 259         u_int                    v_raid_level_qualifier; /* RAID level det. */
 260         u_int                    v_disks_count; /* Number of disks in array. */
 261         u_int                    v_mdf_pdisks;  /* Number of parity disks
 262                                                    in RAIDMDF array. */
 263         uint16_t                 v_mdf_polynomial; /* Polynomial for RAIDMDF. */
 264         uint8_t                  v_mdf_method;  /* Generation method for RAIDMDF. */
 265         u_int                    v_strip_size;  /* Array strip size. */
 266         u_int                    v_rotate_parity; /* Rotate RAID5R parity
 267                                                    after numer of stripes. */
 268         u_int                    v_sectorsize;  /* Volume sector size. */
 269         off_t                    v_mediasize;   /* Volume media size.  */
 270         struct bio_queue_head    v_inflight;    /* In-flight write requests. */
 271         struct bio_queue_head    v_locked;      /* Blocked I/O requests. */
 272         LIST_HEAD(, g_raid_lock) v_locks;        /* List of locked regions. */
 273         int                      v_pending_lock; /* writes to locked region */
 274         int                      v_dirty;       /* Volume is DIRTY. */
 275         struct timeval           v_last_done;   /* Time of the last I/O. */
 276         time_t                   v_last_write;  /* Time of the last write. */
 277         u_int                    v_writes;      /* Number of active writes. */
 278         struct root_hold_token  *v_rootmount;   /* Root mount delay token. */
 279         int                      v_starting;    /* Volume is starting */
 280         int                      v_stopping;    /* Volume is stopping */
 281         int                      v_provider_open; /* Number of opens. */
 282         int                      v_global_id;   /* Global volume ID (rX). */
 283         int                      v_read_only;   /* Volume is read-only. */
 284         TAILQ_ENTRY(g_raid_volume)       v_next; /* List of volumes entry. */
 285         LIST_ENTRY(g_raid_volume)        v_global_next; /* Global list entry. */
 286 };
 287
 288 #define G_RAID_NODE_E_WAKE      0x00
 289 #define G_RAID_NODE_E_START     0x01
 290
 291 struct g_raid_softc {
 292         struct g_raid_md_object *sc_md;         /* Metadata object. */
 293         struct g_geom           *sc_geom;       /* GEOM class instance. */
 294         uint64_t                 sc_flags;      /* Additional flags. */
 295         TAILQ_HEAD(, g_raid_volume)      sc_volumes;    /* List of volumes. */
 296         TAILQ_HEAD(, g_raid_disk)        sc_disks;      /* List of disks. */
 297         struct sx                sc_lock;       /* Main node lock. */
 298         struct proc             *sc_worker;     /* Worker process. */
 299         struct mtx               sc_queue_mtx;  /* Worker queues lock. */
 300         TAILQ_HEAD(, g_raid_event) sc_events;   /* Worker events queue. */
 301         struct bio_queue_head    sc_queue;      /* Worker I/O queue. */
 302         int                      sc_stopping;   /* Node is stopping */
 303 };
 304 #define sc_name sc_geom->name
 305
 306 SYSCTL_DECL(_kern_geom_raid);
 307
 308 /*
 309  * KOBJ parent class of metadata processing modules.
 310  */
 311 struct g_raid_md_class {
 312         KOBJ_CLASS_FIELDS;
 313         int              mdc_enable;
 314         int              mdc_priority;
 315         LIST_ENTRY(g_raid_md_class) mdc_list;
 316 };
 317
 318 /*
 319  * KOBJ instance of metadata processing module.
 320  */
 321 struct g_raid_md_object {
 322         KOBJ_FIELDS;
 323         struct g_raid_md_class  *mdo_class;
 324         struct g_raid_softc     *mdo_softc;     /* Back-pointer to softc. */
 325 };
 326
 327 int g_raid_md_modevent(module_t, int, void *);
 328
 329 #define G_RAID_MD_DECLARE(name, label)                          \
 330     static moduledata_t g_raid_md_##name##_mod = {              \
 331         "g_raid_md_" __XSTRING(name),                           \
 332         g_raid_md_modevent,                                     \
 333         &g_raid_md_##name##_class                               \
 334     };                                                          \
 335     DECLARE_MODULE(g_raid_md_##name, g_raid_md_##name##_mod,    \
 336         SI_SUB_DRIVERS, SI_ORDER_SECOND);                       \
 337     MODULE_DEPEND(g_raid_md_##name, geom_raid, 0, 0, 0);        \
 338     SYSCTL_NODE(_kern_geom_raid, OID_AUTO, name,                \
 339         CTLFLAG_RD | CTLFLAG_MPSAFE,                            \
 340         NULL, label " metadata module");                        \
 341     SYSCTL_INT(_kern_geom_raid_##name, OID_AUTO, enable,        \
 342         CTLFLAG_RWTUN, &g_raid_md_##name##_class.mdc_enable, 0, \
 343         "Enable " label " metadata format taste")
 344
 345 /*
 346  * KOBJ parent class of data transformation modules.
 347  */
 348 struct g_raid_tr_class {
 349         KOBJ_CLASS_FIELDS;
 350         int              trc_enable;
 351         int              trc_priority;
 352         int              trc_accept_unmapped;
 353         LIST_ENTRY(g_raid_tr_class) trc_list;
 354 };
 355
 356 /*
 357  * KOBJ instance of data transformation module.
 358  */
 359 struct g_raid_tr_object {
 360         KOBJ_FIELDS;
 361         struct g_raid_tr_class  *tro_class;
 362         struct g_raid_volume    *tro_volume;    /* Back-pointer to volume. */
 363 };
 364
 365 int g_raid_tr_modevent(module_t, int, void *);
 366
 367 #define G_RAID_TR_DECLARE(name, label)                          \
 368     static moduledata_t g_raid_tr_##name##_mod = {              \
 369         "g_raid_tr_" __XSTRING(name),                           \
 370         g_raid_tr_modevent,                                     \
 371         &g_raid_tr_##name##_class                               \
 372     };                                                          \
 373     DECLARE_MODULE(g_raid_tr_##name, g_raid_tr_##name##_mod,    \
 374         SI_SUB_DRIVERS, SI_ORDER_FIRST);                        \
 375     MODULE_DEPEND(g_raid_tr_##name, geom_raid, 0, 0, 0);        \
 376     SYSCTL_NODE(_kern_geom_raid, OID_AUTO, name,                \
 377         CTLFLAG_RD | CTLFLAG_MPSAFE,                            \
 378         NULL, label " transformation module");                  \
 379     SYSCTL_INT(_kern_geom_raid_##name, OID_AUTO, enable,        \
 380         CTLFLAG_RWTUN, &g_raid_tr_##name##_class.trc_enable, 0, \
 381         "Enable " label " transformation module taste")
 382
 383 const char * g_raid_volume_level2str(int level, int qual);
 384 int g_raid_volume_str2level(const char *str, int *level, int *qual);
 385 const char * g_raid_volume_state2str(int state);
 386 const char * g_raid_subdisk_state2str(int state);
 387 const char * g_raid_disk_state2str(int state);
 388
 389 struct g_raid_softc * g_raid_create_node(struct g_class *mp,
 390     const char *name, struct g_raid_md_object *md);
 391 int g_raid_create_node_format(const char *format, struct gctl_req *req,
 392     struct g_geom **gp);
 393 struct g_raid_volume * g_raid_create_volume(struct g_raid_softc *sc,
 394     const char *name, int id);
 395 struct g_raid_disk * g_raid_create_disk(struct g_raid_softc *sc);
 396 const char * g_raid_get_diskname(struct g_raid_disk *disk);
 397 void g_raid_get_disk_info(struct g_raid_disk *disk);
 398
 399 int g_raid_start_volume(struct g_raid_volume *vol);
 400
 401 int g_raid_destroy_node(struct g_raid_softc *sc, int worker);
 402 int g_raid_destroy_volume(struct g_raid_volume *vol);
 403 int g_raid_destroy_disk(struct g_raid_disk *disk);
 404
 405 void g_raid_iodone(struct bio *bp, int error);
 406 void g_raid_subdisk_iostart(struct g_raid_subdisk *sd, struct bio *bp);
 407 int g_raid_subdisk_kerneldump(struct g_raid_subdisk *sd, void *virtual,
 408     off_t offset, size_t length);
 409
 410 struct g_consumer *g_raid_open_consumer(struct g_raid_softc *sc,
 411     const char *name);
 412 void g_raid_kill_consumer(struct g_raid_softc *sc, struct g_consumer *cp);
 413
 414 void g_raid_report_disk_state(struct g_raid_disk *disk);
 415 void g_raid_change_disk_state(struct g_raid_disk *disk, int state);
 416 void g_raid_change_subdisk_state(struct g_raid_subdisk *sd, int state);
 417 void g_raid_change_volume_state(struct g_raid_volume *vol, int state);
 418
 419 void g_raid_write_metadata(struct g_raid_softc *sc, struct g_raid_volume *vol,
 420     struct g_raid_subdisk *sd, struct g_raid_disk *disk);
 421 void g_raid_fail_disk(struct g_raid_softc *sc,
 422     struct g_raid_subdisk *sd, struct g_raid_disk *disk);
 423
 424 void g_raid_tr_flush_common(struct g_raid_tr_object *tr, struct bio *bp);
 425 int g_raid_tr_kerneldump_common(struct g_raid_tr_object *tr,
 426     void *virtual, vm_offset_t physical, off_t offset, size_t length);
 427
 428 u_int g_raid_ndisks(struct g_raid_softc *sc, int state);
 429 u_int g_raid_nsubdisks(struct g_raid_volume *vol, int state);
 430 u_int g_raid_nopens(struct g_raid_softc *sc);
 431 struct g_raid_subdisk * g_raid_get_subdisk(struct g_raid_volume *vol,
 432     int state);
 433 #define G_RAID_DESTROY_SOFT             0
 434 #define G_RAID_DESTROY_DELAYED  1
 435 #define G_RAID_DESTROY_HARD             2
 436 int g_raid_destroy(struct g_raid_softc *sc, int how);
 437 int g_raid_event_send(void *arg, int event, int flags);
 438 int g_raid_lock_range(struct g_raid_volume *vol, off_t off, off_t len,
 439     struct bio *ignore, void *argp);
 440 int g_raid_unlock_range(struct g_raid_volume *vol, off_t off, off_t len);
 441
 442 g_ctl_req_t g_raid_ctl;
 443 #endif  /* _KERNEL */
 444
 445 #endif  /* !_G_RAID_H_ */