sys/dev/raid/vinum/vinumvar.h

   1 /*-
   2  * Copyright (c) 1997, 1998, 1999
   3  *      Nan Yang Computer Services Limited.  All rights reserved.
   4  *
   5  *  Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
   6  *
   7  *  Written by Greg Lehey
   8  *
   9  *  This software is distributed under the so-called ``Berkeley
  10  *  License'':
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by Nan Yang Computer
  23  *      Services Limited.
  24  * 4. Neither the name of the Company nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * This software is provided ``as is'', and any express or implied
  29  * warranties, including, but not limited to, the implied warranties of
  30  * merchantability and fitness for a particular purpose are disclaimed.
  31  * In no event shall the company or contributors be liable for any
  32  * direct, indirect, incidental, special, exemplary, or consequential
  33  * damages (including, but not limited to, procurement of substitute
  34  * goods or services; loss of use, data, or profits; or business
  35  * interruption) however caused and on any theory of liability, whether
  36  * in contract, strict liability, or tort (including negligence or
  37  * otherwise) arising in any way out of the use of this software, even if
  38  * advised of the possibility of such damage.
  39  */
  40
  41 #include <sys/time.h>
  42 #include "vinumstate.h"
  43
  44 /*
  45  * A disk block number or offset
  46  */
  47 typedef int64_t         vinum_off_t;
  48
  49 /*
  50  * Some configuration maxima.  They're an enum because
  51  * we can't define global constants.  Sorry about that.
  52  *
  53  * These aren't as bad as they look: most of them are soft limits.
  54  */
  55
  56 #define VINUMROOT
  57 enum constants {
  58         VINUM_HEADER = 512,             /* size of header on disk */
  59         MAXCONFIGLINE = 1024,           /* maximum size of one config line */
  60         MINVINUMSLICE = 1048576,        /* minimum size of a slice */
  61
  62         VINUM_CDEV_MAJOR = 91,          /* major number for character device */
  63
  64         ROUND_ROBIN_READPOL = -1,       /* round robin read policy */
  65
  66         /*
  67          * type field in minor number
  68          */
  69         VINUM_VOLUME_TYPE = 0,
  70         VINUM_PLEX_TYPE = 1,
  71         VINUM_SD_TYPE = 2,
  72         VINUM_DRIVE_TYPE = 3,
  73         VINUM_SUPERDEV_TYPE = 4,        /* super device. */
  74         VINUM_RAWPLEX_TYPE = 5,         /* anonymous plex */
  75         VINUM_RAWSD_TYPE = 6,           /* anonymous subdisk */
  76
  77         /*
  78          * Shifts for the individual fields in the device
  79          */
  80         VINUM_TYPE_SHIFT = 28,
  81         VINUM_VOL_SHIFT = 0,
  82         VINUM_PLEX_SHIFT = 16,
  83         VINUM_SD_SHIFT = 20,
  84         VINUM_VOL_WIDTH = 8,
  85         VINUM_PLEX_WIDTH = 3,
  86         VINUM_SD_WIDTH = 8,
  87
  88         /*
  89          * Shifts for the second half of raw plex and
  90          * subdisk numbers
  91          */
  92         VINUM_RAWPLEX_SHIFT = 8,        /* shift the second half this much */
  93         VINUM_RAWPLEX_WIDTH = 12,       /* width of second half */
  94
  95         MAJORDEV_SHIFT = 8,
  96
  97         MAXPLEX = 8,                    /* max number of plexes in a volume */
  98         MAXSD = 256,                    /* max number of subdisks in a plex */
  99         MAXDRIVENAME = 32,              /* max length of a device name */
 100         MAXSDNAME = 64,                 /* max length of a subdisk name */
 101         MAXPLEXNAME = 64,               /* max length of a plex name */
 102         MAXVOLNAME = 64,                /* max length of a volume name */
 103         MAXNAME = 64,                   /* max length of any name */
 104
 105
 106         /*
 107          * Define a minor device number.
 108          * This is not used directly; instead, it's
 109          * called by the other macros.
 110          */
 111 #define VINUMMINOR(v,p,s,t)  (  (v << VINUM_VOL_SHIFT)          \
 112                               | (p << VINUM_PLEX_SHIFT)         \
 113                               | (s << VINUM_SD_SHIFT)           \
 114                               | (t << VINUM_TYPE_SHIFT) )
 115
 116 /* Create device minor numbers */
 117
 118 #ifdef _KERNEL
 119
 120 #define VINUMDEV(v,p,s,t)       \
 121                 VINUMMINOR (v, p, s, t)
 122
 123 #define VINUM_PLEX(p)           \
 124                  ((VINUM_RAWPLEX_TYPE << VINUM_TYPE_SHIFT)      \
 125                  | (p & 0xff)                                   \
 126                  | ((p & ~0xff) << 8))
 127
 128 #define VINUM_SD(s)             \
 129                  ((VINUM_RAWSD_TYPE << VINUM_TYPE_SHIFT)        \
 130                  | (s & 0xff)                                   \
 131                  | ((s & ~0xff) << 8))
 132
 133 #endif
 134
 135     /* Create a bit mask for x bits */
 136 #define MASK(x)  ((1 << (x)) - 1)
 137
 138     /* Create a raw block device minor number */
 139 #define VINUMRMINOR(d,t)        \
 140                 ( ((d & MASK(VINUM_VOL_WIDTH)) << VINUM_VOL_SHIFT)      \
 141                  | ((d & ~MASK(VINUM_VOL_WIDTH)) <<                     \
 142                         (VINUM_PLEX_SHIFT + VINUM_VOL_WIDTH))           \
 143                  | (t << VINUM_TYPE_SHIFT) )
 144
 145     /* extract device type */
 146 #define DEVTYPE(x) ((minor (x) >> VINUM_TYPE_SHIFT) & 7)
 147
 148     /*
 149      * This mess is used to catch people who compile
 150      * a debug vinum(8) and non-debug kernel module,
 151      * or the other way round.
 152      */
 153
 154 #ifdef VINUMDEBUG
 155
 156 /* superdevice number */
 157 #define VINUM_SUPERDEV          VINUMMINOR(1, 0, 0, VINUM_SUPERDEV_TYPE)
 158
 159 /* non-debug superdevice number */
 160 #define VINUM_WRONGSUPERDEV     VINUMMINOR(2, 0, 0, VINUM_SUPERDEV_TYPE)
 161
 162 #else
 163
 164 /* superdevice number */
 165 #define VINUM_SUPERDEV          VINUMMINOR(2, 0, 0, VINUM_SUPERDEV_TYPE)
 166
 167 /* debug superdevice number */
 168 #define VINUM_WRONGSUPERDEV     VINUMMINOR(1, 0, 0, VINUM_SUPERDEV_TYPE)
 169
 170 #endif
 171
 172 /* daemon superdevice number */
 173 #define VINUM_DAEMON_DEV        VINUMMINOR(0, 0, 0, VINUM_SUPERDEV_TYPE)
 174
 175         /*
 176          * the number of object entries to cater for initially, and also the
 177          * value by which they are incremented.  It doesn't take long
 178          * to extend them, so theoretically we could start with 1 of each, but
 179          * it's untidy to allocate such small areas.  These values are
 180          * probably too small.
 181          */
 182
 183         INITIAL_DRIVES = 4,
 184         INITIAL_VOLUMES = 4,
 185         INITIAL_PLEXES = 8,
 186         INITIAL_SUBDISKS = 16,
 187         INITIAL_SUBDISKS_IN_PLEX = 4,   /* num subdisks to alloc to a plex */
 188         INITIAL_SUBDISKS_IN_DRIVE = 4,  /* num subdisks to alloc to a drive */
 189         INITIAL_DRIVE_FREELIST = 16,    /* num entries in drive freelist */
 190         PLEX_REGION_TABLE_SIZE = 8,     /* num entries in plex region tables */
 191         PLEX_LOCKS = 256,               /* num locks to alloc to a plex */
 192         MAX_REVIVE_BLOCKSIZE = MAXPHYS, /* maximum revive block size */
 193         DEFAULT_REVIVE_BLOCKSIZE = 65536,/* default revive block size */
 194         VINUMHOSTNAMELEN = 32,          /* host name field in label */
 195 };
 196
 197 /* device numbers */
 198
 199 /*
 200  *  31 30    28 27                   20 19 18    16 15         8 7      0
 201  * |---------------------------------------------------------------------|
 202  * |X |  Type  |    Subdisk number     | X| Plex   |      Major |  volno |
 203  * |---------------------------------------------------------------------|
 204  *
 205  *    0x2                 03                 1           19         06
 206  *
 207  * The fields in the minor number are interpreted as follows:
 208  *
 209  * Volume:              Only type and volume number are relevant
 210  * Plex in volume:      type, plex number in volume and volume number
 211  *                      are relevant
 212  * raw plex:            type, plex number is made of bits 27-16 and 7-0
 213  * raw subdisk:         type, subdisk number is made of bits 27-16 and 7-0
 214  */
 215
 216 #if 0
 217
 218 /* This doesn't get used.  Consider removing it. */
 219 struct devcode {
 220         /*
 221          * CARE.  These fields assume a big-endian word.  On a
 222          * little-endian system, they're the wrong way around
 223          */
 224         unsigned volume:8;              /* up to 256 volumes */
 225         unsigned major:8;               /* major number fits */
 226         unsigned plex:3;                /* up to 8 plexes per volume */
 227         unsigned unused:1;              /* up for grabs */
 228         unsigned sd:8;                  /* up to 256 subdisks per plex */
 229         unsigned type:3;                /* type of object */
 230         /*
 231          * type field
 232          VINUM_VOLUME = 0,
 233          VINUM_PLEX = 1,
 234          VINUM_SUBDISK = 2,
 235          VINUM_DRIVE = 3,
 236          VINUM_SUPERDEV = 4,
 237          VINUM_RAWPLEX = 5,
 238          VINUM_RAWSD = 6 */
 239         unsigned signbit:1;             /* to make 32 bits */
 240 };
 241
 242 #endif
 243
 244 #define VINUM_BASE  "vinum/"
 245 #define VINUM_DIR   "/dev/vinum"
 246
 247 /*
 248  * These definitions help catch
 249  * userland/kernel mismatches.
 250  */
 251 #if VINUMDEBUG
 252
 253 /* normal super device */
 254 #define VINUM_WRONGSUPERDEV_NAME        VINUM_DIR "/control"
 255 #define VINUM_WRONGSUPERDEV_BASE        VINUM_BASE "control"
 256
 257 /* debug super device */
 258 #define VINUM_SUPERDEV_NAME             VINUM_DIR "/Control"
 259 #define VINUM_SUPERDEV_BASE             VINUM_BASE "Control"
 260
 261 #else
 262
 263 /* debug super device */
 264 #define VINUM_WRONGSUPERDEV_NAME        VINUM_DIR "/Control"
 265 #define VINUM_WRONGSUPERDEV_BASE        VINUM_BASE "Control"
 266
 267 /* normal super device */
 268 #define VINUM_SUPERDEV_NAME             VINUM_DIR "/control"
 269 #define VINUM_SUPERDEV_BASE             VINUM_BASE "control"
 270
 271 #endif
 272
 273 /* super device for daemon only */
 274 #define VINUM_DAEMON_DEV_NAME           VINUM_DIR "/controld"
 275 #define VINUM_DAEMON_DEV_BASE           VINUM_BASE "controld"
 276
 277 /*
 278  * Flags for all objects.  Most of them only apply to
 279  * specific objects, but we have space for all in any
 280  * 32 bit flags word.
 281  */
 282 enum objflags {
 283         VF_LOCKED = 1,                  /* locked access to this object */
 284         VF_LOCKING = 2,                 /* we want access to this object */
 285         VF_OPEN = 4,                    /* object has openers */
 286         VF_WRITETHROUGH = 8,            /* volume: write through */
 287         VF_INITED = 0x10,               /* unit has been initialized */
 288
 289         /* 0x20 unused, was: VF_WLABEL: label area is writable */
 290         VF_LABELLING = 0x40,            /* unit is currently being labelled */
 291         VF_WANTED = 0x80,               /* waiting to obtain a lock */
 292         VF_RAW = 0x100,                 /* raw volume (no file system) */
 293         VF_LOADED = 0x200,              /* module is loaded */
 294         VF_CONFIGURING = 0x400,         /* someone is changing the config */
 295         VF_WILL_CONFIGURE = 0x800,      /* someone wants to change the config */
 296         VF_CONFIG_INCOMPLETE = 0x1000,  /* not finished changing the config */
 297         VF_CONFIG_SETUPSTATE = 0x2000,  /* set a vol up if all plexes empty */
 298         VF_READING_CONFIG = 0x4000,     /* reading config database from disk */
 299         VF_FORCECONFIG = 0x8000,        /* config drives even with diff names */
 300         VF_NEWBORN = 0x10000,           /* for objects: we've just created it */
 301         VF_CONFIGURED = 0x20000,        /* for drives: we read the config */
 302         VF_STOPPING = 0x40000,          /* for vinum_conf: stop on last close */
 303
 304         VF_DAEMONOPEN = 0x80000,        /* the daemon has us open (only
 305                                          * superdev) */
 306
 307         VF_CREATED = 0x100000,          /* for vols: freshly created,
 308                                          * more then new */
 309         VF_HOTSPARE = 0x200000,         /* for drives: use as hot spare */
 310         VF_RETRYERRORS = 0x400000,      /* don't down subdisks on I/O errors */
 311 };
 312
 313 /* Global configuration information for the vinum subsystem */
 314 struct _vinum_conf {
 315         /* Pointers to vinum structures */
 316         struct drive *drive;
 317         struct sd *sd;
 318         struct plex *plex;
 319         struct volume *volume;
 320
 321         /* the number allocated */
 322         int drives_allocated;
 323         int subdisks_allocated;
 324         int plexes_allocated;
 325         int volumes_allocated;
 326
 327         /* and the number currently in use */
 328         int drives_used;
 329         int subdisks_used;
 330         int plexes_used;
 331         int volumes_used;
 332
 333         int flags;
 334
 335 #define VINUM_MAXACTIVE  30000  /* max number of active requests */
 336         int active;             /* current number of requests outstanding */
 337         int maxactive;          /* max number of requests ever outstanding */
 338 #if VINUMDEBUG
 339         struct request *lastrq;
 340         struct bio *lastbio;
 341 #endif
 342         int physbufs;
 343 };
 344
 345 /* Use these defines to simplify code */
 346 #define DRIVE vinum_conf.drive
 347 #define SD vinum_conf.sd
 348 #define PLEX vinum_conf.plex
 349 #define VOL vinum_conf.volume
 350 #define VFLAGS vinum_conf.flags
 351
 352 /*
 353  * Slice header
 354  *
 355  * Vinum drives start with this structure:
 356  *
 357  *\                                            Sector
 358  * |--------------------------------------|
 359  * |   PDP-11 memorial boot block         |      0
 360  * |--------------------------------------|
 361  * |   Disk label, maybe                  |      1
 362  * |--------------------------------------|
 363  * |   Slice definition  (vinum_hdr)      |      8
 364  * |--------------------------------------|
 365  * |                                      |
 366  * |   Configuration info, first copy     |      9
 367  * |                                      |
 368  * |--------------------------------------|
 369  * |                                      |
 370  * |   Configuration info, second copy    |      9 + size of config
 371  * |                                      |
 372  * |--------------------------------------|
 373  */
 374
 375 /*
 376  * Sizes and offsets of our information
 377  */
 378 enum {
 379         VINUM_LABEL_OFFSET = 4096,      /* offset of vinum label */
 380         VINUMHEADERLEN = 512,           /* size of vinum label */
 381         VINUM_CONFIG_OFFSET = 4608,     /* offset of first config copy */
 382         MAXCONFIG = 65536,              /* and size of config copy */
 383
 384         /* this is where the data starts */
 385         DATASTART = (MAXCONFIG * 2 + VINUM_CONFIG_OFFSET) / DEV_BSIZE
 386 };
 387
 388 /*
 389  * hostname is 256 bytes long, but we don't need to shlep
 390  * multiple copies in vinum.  We use the host name just
 391  * to identify this system, and 32 bytes should be ample
 392  * for that purpose
 393  */
 394
 395 struct vinum_label {
 396         char sysname[VINUMHOSTNAMELEN]; /* system name at time of creation */
 397         char name[MAXDRIVENAME];        /* our name of the drive */
 398         struct timeval date_of_birth;   /* the time it was created */
 399         struct timeval last_update;     /* and the time of last update */
 400         /*
 401          * total size in bytes of the drive.  This value
 402          * includes the headers.
 403          */
 404         off_t drive_size;
 405 };
 406
 407 struct vinum_hdr {
 408         uint64_t magic;                 /* we're long on magic numbers */
 409
 410         /*
 411          * Size in bytes of each copy of the
 412          * configuration info.  This must be a multiple
 413          * of the sector size.
 414          */
 415         int config_length;
 416         struct vinum_label label;       /* unique label */
 417 };
 418
 419 /* should be this */
 420 #define VINUM_MAGIC    22322600044678729LL
 421
 422 /* becomes this after obliteration */
 423 #define VINUM_NOMAGIC  22322600044678990LL
 424
 425 /* Information returned from read_drive_label */
 426 enum drive_label_info {
 427         DL_CANT_OPEN,                   /* invalid partition */
 428         DL_NOT_OURS,                    /* valid part, but no vinum label */
 429         DL_DELETED_LABEL,               /* valid part, deleted label found */
 430         DL_WRONG_DRIVE,                 /* drive name doesn't match */
 431         DL_OURS                         /* valid partition and label found */
 432 };
 433
 434 /*** Drive definitions ***/
 435 /*
 436  * A drive corresponds to a disk slice.  We use a different term to show
 437  * the difference in usage: it doesn't have to be a slice, and could
 438  * theoretically be a complete, unpartitioned disk
 439  */
 440
 441 struct drive {
 442         char devicename[MAXDRIVENAME];  /* name of the slice it's on */
 443         enum drivestate state;          /* current state */
 444         int flags;                      /* flags */
 445         int subdisks_allocated;         /* number of entries in sd */
 446         int subdisks_used;              /* and the number used */
 447         int blocksize;                  /* size of fs blocks */
 448         int pid;                        /* of locker */
 449         u_int64_t sectors_available;    /* number of sectors still available */
 450         int secsperblock;
 451         int lasterror;                  /* last error on drive */
 452         int driveno;                    /* index of drive in vinum_conf */
 453         int opencount;                  /* number of up subdisks */
 454         u_int64_t reads;                /* number of reads on this drive */
 455         u_int64_t writes;               /* number of writes on this drive */
 456         u_int64_t bytes_read;           /* number of bytes read */
 457         u_int64_t bytes_written;        /* number of bytes written */
 458         struct vinum_label label;       /* and the label information */
 459 #define DRIVE_MAXACTIVE  30000          /* maximum number of active requests */
 460         int active;                     /* current number of reqs outstanding */
 461         int maxactive;                  /* max num of reqs ever outstanding */
 462         int freelist_size;              /* entries alloced in free list */
 463         int freelist_entries;           /* entries used in free list */
 464         struct drive_freelist {         /* sorted list of free space on drive */
 465                 u_int64_t offset;       /* offset of entry */
 466                 u_int64_t sectors;      /* and length in sectors */
 467         } *freelist;
 468         struct partinfo partinfo;       /* partition information */
 469         /* XXX kludge until we get this struct cleaned up */
 470 #if _KERNEL
 471         struct vnode *vp;
 472         struct cdev *dev;
 473 #else
 474         void    *vp_dummy;
 475         void    *dev_dummy;
 476 #endif
 477 #ifdef VINUMDEBUG
 478         char lockfilename[16];          /* locked with file */
 479         int lockline;                   /* and the line number */
 480 #endif
 481 };
 482
 483 /*** Subdisk definitions ***/
 484
 485 struct sd {
 486         char name[MAXSDNAME];           /* name of subdisk */
 487         enum sdstate state;             /* state */
 488         int flags;
 489         int lasterror;                  /* last error occurred */
 490         /* offsets in blocks */
 491         int64_t driveoffset;            /* offset on drive */
 492 #ifdef _KERNEL
 493         cdev_t  sd_dev;
 494 #else
 495         void    *sd_dev_dummy;
 496 #endif
 497
 498         /*
 499          * plexoffset is the offset from the beginning
 500          * of the plex to the very first part of the
 501          * subdisk, in sectors.  For striped, RAID-4 and
 502          * RAID-5 plexes, only the first stripe is
 503          * located at this offset
 504          */
 505         int64_t plexoffset;             /* offset in plex */
 506         u_int64_t sectors;              /* and length in sectors */
 507         int plexno;                     /* index of plex, if it belongs */
 508         int driveno;                    /* index of the drive */
 509         int sdno;                       /* our index in vinum_conf */
 510         int plexsdno;                   /* and our number in our plex */
 511         /* (undefined if no plex) */
 512         u_int64_t reads;                /* number of reads on this subdisk */
 513         u_int64_t writes;               /* number of writes on this subdisk */
 514         u_int64_t bytes_read;           /* number of bytes read */
 515         u_int64_t bytes_written;        /* number of bytes written */
 516         /* revive parameters */
 517         u_int64_t revived;              /* blkno of current revive request */
 518         int revive_blocksize;           /* revive block size (bytes) */
 519         int revive_interval;            /* and time to wait between transfers */
 520         pid_t reviver;                  /* PID of reviving process */
 521         /* init parameters */
 522         u_int64_t initialized;          /* blkno of current init request */
 523         int init_blocksize;             /* init block size (bytes) */
 524         int init_interval;              /* time to wait between transfers */
 525         struct request *waitlist;       /* list of reqs waiting on revive op */
 526 };
 527
 528 /*** Plex definitions ***/
 529
 530 /* kinds of plex organization */
 531 enum plexorg {
 532         plex_disorg,                    /* disorganized */
 533         plex_concat,                    /* concatenated plex */
 534         plex_striped,                   /* striped plex */
 535         plex_raid4,                     /* RAID4 plex */
 536         plex_raid5                      /* RAID5 plex */
 537 };
 538
 539 /* Recognize plex organizations */
 540 /* RAID 1, 4 or 5 */
 541 #define isstriped(p)    (p->organization >= plex_striped)
 542
 543 /* RAID 4 or 5 */
 544 #define isparity(p)     (p->organization >= plex_raid4)
 545
 546 struct plex {
 547         char name[MAXPLEXNAME];         /* name of plex */
 548         enum plexorg organization;      /* Plex organization */
 549         enum plexstate state;           /* and current state */
 550 #ifdef _KERNEL
 551         cdev_t  plex_dev;
 552 #else
 553         void    *plex_dev_dummy;
 554 #endif
 555         u_int64_t length;               /* total length of plex (sectors) */
 556         int flags;
 557         int stripesize;                 /* size of stripe or raid band,
 558                                          * in sectors */
 559         int subdisks;                   /* number of associated subdisks */
 560         int subdisks_allocated;         /* number of subdisks allocated
 561                                          * space for */
 562         int *sdnos;                     /* list of component subdisks */
 563         int plexno;                     /* index of plex in vinum_conf */
 564         int volno;                      /* index of volume */
 565         int volplexno;                  /* number of plex in volume */
 566         /* Statistics */
 567         u_int64_t reads;                /* number of reads on this plex */
 568         u_int64_t writes;               /* number of writes on this plex */
 569         u_int64_t bytes_read;           /* number of bytes read */
 570         u_int64_t bytes_written;        /* number of bytes written */
 571         u_int64_t recovered_reads;      /* number of recovered read
 572                                          * operations */
 573         u_int64_t degraded_writes;      /* number of degraded writes */
 574         u_int64_t parityless_writes;    /* number of parityless writes */
 575         u_int64_t multiblock;           /* requests that needed more than
 576                                          * one block */
 577         u_int64_t multistripe;          /* requests that needed more than
 578                                          * one stripe */
 579         int sddowncount;                /* number of subdisks down */
 580
 581         /* Lock information */
 582         int usedlocks;                  /* number currently in use */
 583         int lockwaits;                  /* and number of waits for locks */
 584         off_t checkblock;               /* block number for parity op */
 585         struct rangelock *lock;         /* ranges of locked addresses */
 586 };
 587
 588 /*** Volume definitions ***/
 589
 590 /* Address range definitions, for locking volumes */
 591 struct rangelock {
 592         vinum_off_t stripe;             /* address + 1 of the range being locked  */
 593         struct buf *bp;         /* user's buffer pointer */
 594 };
 595
 596 struct volume {
 597         char name[MAXVOLNAME];          /* name of volume */
 598         enum volumestate state;         /* current state */
 599         int plexes;                     /* number of plexes */
 600         int preferred_plex;             /* plex to read from, -1 for
 601                                          * round-robin */
 602 #ifdef _KERNEL
 603         cdev_t  vol_dev;
 604 #else
 605         void    *vol_dev_dummy;
 606 #endif
 607
 608         /*
 609          * index of plex used for last read, for
 610          * round-robin.
 611          */
 612         int last_plex_read;
 613         int volno;                      /* volume number */
 614         int flags;                      /* status and configuration flags */
 615         int openflags;                  /* flags supplied to last open(2) */
 616         u_int64_t size;                 /* size of volume */
 617         int blocksize;                  /* logical block size */
 618         int active;                     /* number of outstanding
 619                                          * requests active */
 620         int subops;                     /* and the number of suboperations */
 621         /* Statistics */
 622         u_int64_t bytes_read;           /* number of bytes read */
 623         u_int64_t bytes_written;        /* number of bytes written */
 624         u_int64_t reads;                /* number of reads on this volume */
 625         u_int64_t writes;               /* number of writes on this volume */
 626         u_int64_t recovered_reads;      /* reads recovered from another plex */
 627
 628         /*
 629          * Unlike subdisks in the plex, space for the
 630          * plex pointers is static.
 631          */
 632         int plex[MAXPLEX];              /* index of plexes */
 633 };
 634
 635 /*
 636  * Table expansion.  Expand table, which contains oldcount
 637  * entries of type element, by increment entries, and change
 638  * oldcount accordingly
 639  */
 640 #define EXPAND(table, element, oldcount, increment)         \
 641 {                                                           \
 642       expand_table((void **) &table,                        \
 643                    oldcount * sizeof (element),             \
 644                    (oldcount + increment) * sizeof (element)); \
 645       oldcount += increment;                                \
 646 }
 647
 648 /*
 649  * Information on vinum's memory usage
 650  */
 651 struct meminfo {
 652         int mallocs;                    /* number of malloced blocks */
 653         int total_malloced;             /* total amount malloced */
 654         int highwater;                  /* maximum number of mallocs */
 655         struct mc *malloced;            /* pointer to kernel table */
 656 };
 657
 658 #define MCFILENAMELEN   16
 659 struct mc {
 660         struct timeval time;
 661         int seq;
 662         int size;
 663         short line;
 664         caddr_t address;
 665         char file[MCFILENAMELEN];
 666 };
 667
 668 /*
 669  * These enums are used by the state transition
 670  * routines.  They're in bit map format:
 671  *
 672  * Bit 0: Other plexes in the volume are down
 673  * Bit 1: Other plexes in the volume are up
 674  * Bit 2: The current plex is up
 675  * Maybe they should be local to
 676  * state.c
 677  */
 678 enum volplexstate {
 679         volplex_onlyusdown = 0,         /* 0: we're the only plex,
 680                                          * and we're down */
 681         volplex_alldown,                /* 1: another plex is down,
 682                                          * and so are we */
 683         volplex_otherup,                /* 2: another plex is up */
 684         volplex_otherupdown,            /* 3: other plexes are up and down */
 685         volplex_onlyus,                 /* 4: we're up and alone */
 686         volplex_onlyusup,               /* 5: only we are up, others are down */
 687         volplex_allup,                  /* 6: all plexes are up */
 688         volplex_someup                  /* 7: some plexes are up,
 689                                          * including us */
 690 };
 691
 692 /* state map for plex */
 693 enum sdstates {
 694         sd_emptystate = 1,
 695         sd_downstate = 2,               /* SD is down */
 696         sd_crashedstate = 4,            /* SD is crashed */
 697         sd_obsoletestate = 8,           /* SD is obsolete */
 698         sd_stalestate = 16,             /* SD is stale */
 699         sd_rebornstate = 32,            /* SD is reborn */
 700         sd_upstate = 64,                /* SD is up */
 701         sd_initstate = 128,             /* SD is initializing */
 702         sd_initializedstate = 256,      /* SD is initialized */
 703         sd_otherstate = 512,            /* SD is in some other state */
 704 };
 705
 706 /*
 707  * This is really just a parameter to pass to
 708  * set_<foo>_state, but since it needs to be known
 709  * in the external definitions, we need to define
 710  * it here
 711  */
 712 enum setstateflags {
 713         setstate_none = 0,              /* no flags */
 714         setstate_force = 1,             /* force the state change */
 715         setstate_configuring = 2,       /* we're currently configuring,
 716                                            don't save */
 717 };
 718
 719 /* Operations for parityops to perform. */
 720 enum parityop {
 721         checkparity,
 722         rebuildparity,
 723         rebuildandcheckparity,          /* rebuildparity with the -v option */
 724 };
 725
 726 #ifdef VINUMDEBUG
 727
 728 /*
 729  * Debugging stuff
 730  */
 731 enum debugflags {
 732         DEBUG_ADDRESSES = 1,            /* show buffer information during
 733                                          * requests */
 734         DEBUG_NUMOUTPUT = 2,            /* show the value of vp->v_numoutput */
 735         DEBUG_RESID = 4,                /* go into debugger in complete_rqe */
 736         DEBUG_LASTREQS = 8,             /* keep a circular buffer of
 737                                          * last requests */
 738         DEBUG_REVIVECONFLICT = 16,      /* print info about revive conflicts */
 739         DEBUG_EOFINFO = 32,             /* print info about EOF detection */
 740         DEBUG_MEMFREE = 64,             /* keep info about Frees */
 741         DEBUG_BIGDRIVE = 128,           /* pretend our drives are 100 times
 742                                          * the size */
 743         DEBUG_REMOTEGDB = 256,          /* go into remote gdb */
 744         DEBUG_WARNINGS = 512,           /* log various relatively
 745                                          * harmless warnings  */
 746 };
 747
 748 #ifdef _KERNEL
 749 #ifdef __i386__
 750 #define longjmp LongJmp                 /* test our longjmps */
 751 #endif
 752 #endif
 753 #endif