FreeBSD/Linux Kernel Cross Reference
sys/geom/vinum/geom_vinum_var.h

     /*-
      * Copyright (c) 2004, 2007 Lukas Ertl
      * Copyright (c) 1997, 1998, 1999
      *      Nan Yang Computer Services Limited.  All rights reserved.
      *
      * Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
      * Parts written by Greg Lehey.
      *
      *  This software is distributed under the so-called ``Berkeley
     *  License'':                                                                   *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Nan Yang Computer
     *      Services Limited.
     * 4. Neither the name of the Company nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *  
     * This software is provided ``as is'', and any express or implied
     * warranties, including, but not limited to, the implied warranties of
     * merchantability and fitness for a particular purpose are disclaimed.
     * In no event shall the company or contributors be liable for any               * direct, indirect, incidental, special, exemplary, or consequential
     * damages (including, but not limited to, procurement of substitute
     * goods or services; loss of use, data, or profits; or business
     * interruption) however caused and on any theory of liability, whether
     * in contract, strict liability, or tort (including negligence or
     * otherwise) arising in any way out of the use of this software, even if
     * advised of the possibility of such damage.
     *  
     * $FreeBSD: releng/8.3/sys/geom/vinum/geom_vinum_var.h 211065 2010-08-08 09:12:30Z jh $
     */
    
    #ifndef _GEOM_VINUM_VAR_H_
    #define _GEOM_VINUM_VAR_H_
    
    /*
     * Slice header
     *
     * Vinum drives start with this structure:
     *
     *\                                            Sector
     * |--------------------------------------|
     * |   PDP-11 memorial boot block         |      0
     * |--------------------------------------|
     * |   Disk label, maybe                  |      1
     * |--------------------------------------|
     * |   Slice definition  (vinum_hdr)      |      8
     * |--------------------------------------|
     * |                                      |
     * |   Configuration info, first copy     |      9
     * |                                      |
     * |--------------------------------------|
     * |                                      |
     * |   Configuration info, second copy    |      9 + size of config
     * |                                      |
     * |--------------------------------------|
     */
    
    /* Sizes and offsets of our information. */
    #define GV_HDR_OFFSET   4096    /* Offset of vinum header. */
    #define GV_HDR_LEN      512     /* Size of vinum header. */
    #define GV_CFG_OFFSET   4608    /* Offset of first config copy. */
    #define GV_CFG_LEN      65536   /* Size of config copy. */
    
    /* This is where the actual data starts. */
    #define GV_DATA_START   (GV_CFG_LEN * 2 + GV_CFG_OFFSET)
    /* #define GV_DATA_START        (GV_CFG_LEN * 2 + GV_HDR_LEN) */
    
    #define GV_MAXDRIVENAME 32      /* Maximum length of a device name. */
    #define GV_MAXSDNAME    64      /* Maximum length of a subdisk name. */
    #define GV_MAXPLEXNAME  64      /* Maximum length of a plex name. */
    #define GV_MAXVOLNAME   64      /* Maximum length of a volume name. */
    
    /* Command line flags. */
    #define GV_FLAG_R       0x01
    #define GV_FLAG_S       0x02
    #define GV_FLAG_V       0x04
    #define GV_FLAG_VV      0x08
    #define GV_FLAG_F       0x10
    
    /* Object types. */
    #define GV_TYPE_VOL     1
    #define GV_TYPE_PLEX    2
    #define GV_TYPE_SD      3
    #define GV_TYPE_DRIVE   4
    
    /* State changing flags. */
    #define GV_SETSTATE_FORCE       0x1
    #define GV_SETSTATE_CONFIG      0x2
    
    /* Subdisk state bitmaps for plexes. */
   #define GV_SD_DOWNSTATE         0x01    /* Subdisk is down. */
   #define GV_SD_STALESTATE        0x02    /* Subdisk is stale. */
   #define GV_SD_INITSTATE         0x04    /* Subdisk is initializing. */
   #define GV_SD_UPSTATE           0x08    /* Subdisk is up. */
   
   /* Synchronization/initialization request sizes. */
   #define GV_MIN_SYNCSIZE         512
   #define GV_MAX_SYNCSIZE         MAXPHYS
   #define GV_DFLT_SYNCSIZE        65536
   
   /* Flags for BIOs, as they are processed within vinum. */
   #define GV_BIO_GROW     0x01
   #define GV_BIO_MALLOC   0x02
   #define GV_BIO_ONHOLD   0x04
   #define GV_BIO_SYNCREQ  0x08
   #define GV_BIO_INIT     0x10
   #define GV_BIO_REBUILD  0x20
   #define GV_BIO_CHECK    0x40
   #define GV_BIO_PARITY   0x80
   #define GV_BIO_INTERNAL \
       (GV_BIO_SYNCREQ | GV_BIO_INIT | GV_BIO_REBUILD | GV_BIO_CHECK | GV_BIO_GROW)
   
   /* Error codes to be used within gvinum. */
   #define GV_ERR_SETSTATE         (-1)    /* Error setting state. */
   #define GV_ERR_BADSIZE          (-2)    /* Object has wrong size. */
   #define GV_ERR_INVTYPE          (-3)    /* Invalid object type. */
   #define GV_ERR_CREATE           (-4)    /* Error creating gvinum object. */
   #define GV_ERR_ISBUSY           (-5)    /* Object is busy. */
   #define GV_ERR_ISATTACHED       (-6)    /* Object is attached to another. */
   #define GV_ERR_INVFLAG          (-7)    /* Invalid flag passed. */
   #define GV_ERR_INVSTATE         (-8)    /* Invalid state. */
   #define GV_ERR_NOTFOUND         (-9)    /* Object not found. */
   #define GV_ERR_NAMETAKEN        (-10)   /* Object name is taken. */
   #define GV_ERR_NOSPACE          (-11)   /* No space left on drive/subdisk. */
   #define GV_ERR_BADOFFSET        (-12)   /* Invalid offset specified. */
   #define GV_ERR_INVNAME          (-13)   /* Invalid object name. */
   #define GV_ERR_PLEXORG          (-14)   /* Invalid plex organization. */
   
   /*
    * hostname is 256 bytes long, but we don't need to shlep multiple copies in
    * vinum.  We use the host name just to identify this system, and 32 bytes
    * should be ample for that purpose.
    */
   
   #define GV_HOSTNAME_LEN 32
   struct gv_label {
           char    sysname[GV_HOSTNAME_LEN]; /* System name at creation time. */
           char    name[GV_MAXDRIVENAME];  /* Our name of the drive. */
           struct timeval  date_of_birth;  /* The time it was created ... */
           struct timeval  last_update;    /* ... and the time of last update. */
           off_t           drive_size;     /* Total size incl. headers. */
   };
   
   /* The 'header' of each valid vinum drive. */
   struct gv_hdr {
           uint64_t        magic;
   #define GV_OLD_MAGIC    0x494E2056494E4F00LL
   #define GV_OLD_NOMAGIC  0x4E4F2056494E4F00LL
   #define GV_MAGIC        0x56494E554D2D3100LL
   #define GV_NOMAGIC      0x56494E554D2D2D00LL
   
           uint64_t        config_length;
           struct gv_label label;
   };
   
   /* A single freelist entry of a drive. */
   struct gv_freelist {
           off_t size;                             /* Size of this free slot. */
           off_t offset;                           /* Offset on the drive. */
           LIST_ENTRY(gv_freelist) freelist;
   };
   
   /*
    * Since we share structures between userland and kernel, we need this helper
    * struct instead of struct bio_queue_head and friends.  Maybe I find a proper
    * solution some day.
    */
   struct gv_bioq {
           struct bio *bp;
           TAILQ_ENTRY(gv_bioq)    queue;
   };
   
   #define GV_EVENT_DRIVE_TASTED           1
   #define GV_EVENT_DRIVE_LOST             2
   #define GV_EVENT_THREAD_EXIT            3
   #define GV_EVENT_CREATE_DRIVE           4
   #define GV_EVENT_CREATE_VOLUME          5
   #define GV_EVENT_CREATE_PLEX            6
   #define GV_EVENT_CREATE_SD              7
   #define GV_EVENT_SAVE_CONFIG            8
   #define GV_EVENT_RM_VOLUME              9
   #define GV_EVENT_RM_PLEX                10
   #define GV_EVENT_RM_SD                  11
   #define GV_EVENT_RM_DRIVE               12
   #define GV_EVENT_SET_SD_STATE           13
   #define GV_EVENT_SET_DRIVE_STATE        14
   #define GV_EVENT_SET_VOL_STATE          15
   #define GV_EVENT_SET_PLEX_STATE         16
   #define GV_EVENT_RESET_CONFIG           17
   #define GV_EVENT_PARITY_REBUILD         18
   #define GV_EVENT_PARITY_CHECK           19
   #define GV_EVENT_START_PLEX             20
   #define GV_EVENT_START_VOLUME           21
   #define GV_EVENT_ATTACH_PLEX            22
   #define GV_EVENT_ATTACH_SD              23
   #define GV_EVENT_DETACH_PLEX            24
   #define GV_EVENT_DETACH_SD              25
   #define GV_EVENT_RENAME_VOL             26
   #define GV_EVENT_RENAME_PLEX            27
   #define GV_EVENT_RENAME_SD              28
   #define GV_EVENT_RENAME_DRIVE           29
   #define GV_EVENT_MOVE_SD                30
   #define GV_EVENT_SETUP_OBJECTS          31
   
   #ifdef _KERNEL
   struct gv_event {
           int     type;
           void    *arg1;
           void    *arg2;
           intmax_t arg3;
           intmax_t arg4;
           TAILQ_ENTRY(gv_event)   events;
   };
   
   /* This struct contains the main vinum config. */
   struct gv_softc {
           /* Linked lists of all objects in our setup. */
           LIST_HEAD(,gv_drive)    drives;         /* All drives. */
           LIST_HEAD(,gv_plex)     plexes;         /* All plexes. */
           LIST_HEAD(,gv_sd)       subdisks;       /* All subdisks. */
           LIST_HEAD(,gv_volume)   volumes;        /* All volumes. */
   
           TAILQ_HEAD(,gv_event)   equeue;         /* Event queue. */
           struct mtx              equeue_mtx;     /* Event queue lock. */
           struct mtx              bqueue_mtx;     /* BIO queue lock. */
           struct mtx              config_mtx;     /* Configuration lock. */
           struct bio_queue_head   *bqueue_down;   /* BIO queue incoming
                                                      requests. */
           struct bio_queue_head   *bqueue_up;     /* BIO queue for completed
                                                      requests. */
           struct g_geom           *geom;          /* Pointer to our VINUM geom. */
           struct proc             *worker;        /* Worker process. */
   };
   #endif
   
   /* softc for a drive. */
   struct gv_drive {
           char    name[GV_MAXDRIVENAME];          /* The name of this drive. */
           char    device[GV_MAXDRIVENAME];        /* Associated device. */
           int     state;                          /* The state of this drive. */
   #define GV_DRIVE_DOWN   0
   #define GV_DRIVE_UP     1
   
           off_t   size;                           /* Size of this drive. */
           off_t   avail;                          /* Available space. */
           int     sdcount;                        /* Number of subdisks. */
   
           int     flags;
   #define GV_DRIVE_REFERENCED     0x01    /* The drive isn't really existing,
                                              but was referenced by a subdisk
                                              during taste. */
   
           struct gv_hdr   *hdr;           /* The drive header. */
   
           struct g_consumer *consumer;    /* Consumer attached to this drive. */
   
           int freelist_entries;                   /* Count of freelist entries. */
           LIST_HEAD(,gv_freelist) freelist;       /* List of freelist entries. */
           LIST_HEAD(,gv_sd)       subdisks;       /* Subdisks on this drive. */
           LIST_ENTRY(gv_drive)    drive;          /* Entry in the vinum config. */
   
           struct gv_softc *vinumconf;             /* Pointer to the vinum conf. */
   };
   
   /* softc for a subdisk. */
   struct gv_sd {
           char    name[GV_MAXSDNAME];     /* The name of this subdisk. */
           off_t   size;                   /* The size of this subdisk. */
           off_t   drive_offset;           /* Offset in the underlying drive. */
           off_t   plex_offset;            /* Offset in the associated plex. */
           int     state;                  /* The state of this subdisk. */
   #define GV_SD_DOWN              0
   #define GV_SD_STALE             1
   #define GV_SD_INITIALIZING      2
   #define GV_SD_REVIVING          3
   #define GV_SD_UP                4
   
           off_t   initialized;            /* Count of initialized bytes. */
   
           int     init_size;              /* Initialization read/write size. */
           int     init_error;             /* Flag error on initialization. */
   
           int     flags;
   #define GV_SD_NEWBORN           0x01    /* Subdisk is created by user. */
   #define GV_SD_TASTED            0x02    /* Subdisk is created during taste. */
   #define GV_SD_CANGOUP           0x04    /* Subdisk can go up immediately. */
   #define GV_SD_GROW              0x08    /* Subdisk is added to striped plex. */
   
           char drive[GV_MAXDRIVENAME];    /* Name of underlying drive. */
           char plex[GV_MAXPLEXNAME];      /* Name of associated plex. */
   
           struct gv_drive *drive_sc;      /* Pointer to underlying drive. */
           struct gv_plex  *plex_sc;       /* Pointer to associated plex. */
   
           LIST_ENTRY(gv_sd) from_drive;   /* Subdisk list of underlying drive. */
           LIST_ENTRY(gv_sd) in_plex;      /* Subdisk list of associated plex. */
           LIST_ENTRY(gv_sd) sd;           /* Entry in the vinum config. */
   
           struct gv_softc *vinumconf;     /* Pointer to the vinum config. */
   };
   
   /* softc for a plex. */
   struct gv_plex {
           char    name[GV_MAXPLEXNAME];   /* The name of the plex. */
           off_t   size;                   /* The size of the plex. */
           int     state;                  /* The plex state. */
   #define GV_PLEX_DOWN            0
   #define GV_PLEX_INITIALIZING    1
   #define GV_PLEX_DEGRADED        2
   #define GV_PLEX_GROWABLE        3
   #define GV_PLEX_UP              4
   
           int     org;                    /* The plex organisation. */
   #define GV_PLEX_DISORG  0
   #define GV_PLEX_CONCAT  1
   #define GV_PLEX_STRIPED 2
   #define GV_PLEX_RAID5   4
   
           int     stripesize;             /* The stripe size of the plex. */
   
           char    volume[GV_MAXVOLNAME];  /* Name of associated volume. */
           struct gv_volume *vol_sc;       /* Pointer to associated volume. */
   
           int     sddetached;             /* Number of detached subdisks. */
           int     sdcount;                /* Number of subdisks in this plex. */
           int     sddown;                 /* Number of subdisks that are down. */
           int     flags;
   #define GV_PLEX_ADDED           0x01    /* Added to an existing volume. */
   #define GV_PLEX_SYNCING         0x02    /* Plex is syncing from another plex. */
   #define GV_PLEX_THREAD_ACTIVE   0x04    /* Plex has an active RAID5 thread. */
   #define GV_PLEX_THREAD_DIE      0x08    /* Signal the RAID5 thread to die. */
   #define GV_PLEX_THREAD_DEAD     0x10    /* The RAID5 thread has died. */
   #define GV_PLEX_NEWBORN         0x20    /* The plex was just created. */
   #define GV_PLEX_REBUILDING      0x40    /* The plex is rebuilding. */
   #define GV_PLEX_GROWING         0x80    /* The plex is growing. */
   
           off_t   synced;                 /* Count of synced bytes. */
   
           TAILQ_HEAD(,gv_raid5_packet)    packets; /* RAID5 sub-requests. */
   
           LIST_HEAD(,gv_sd)   subdisks;   /* List of attached subdisks. */
           LIST_ENTRY(gv_plex) in_volume;  /* Plex list of associated volume. */
           LIST_ENTRY(gv_plex) plex;       /* Entry in the vinum config. */
   
   #ifdef  _KERNEL
           struct bio_queue_head   *bqueue;        /* BIO queue. */
           struct bio_queue_head   *wqueue;        /* Waiting BIO queue. */
           struct bio_queue_head   *rqueue;        /* Rebuild waiting BIO queue. */
   #else
           char                    *bpad, *wpad, *rpad; /* Padding for userland. */
   #endif
   
           struct gv_softc *vinumconf;     /* Pointer to the vinum config. */
   };
   
   /* softc for a volume. */
   struct gv_volume {
           char    name[GV_MAXVOLNAME];    /* The name of the volume. */
           off_t   size;                   /* The size of the volume. */
           int     plexcount;              /* Number of plexes. */
           int     state;                  /* The state of the volume. */
   #define GV_VOL_DOWN     0
   #define GV_VOL_UP       1
   
           int     flags;
   #define GV_VOL_THREAD_ACTIVE    0x01    /* Volume has an active thread. */
   #define GV_VOL_THREAD_DIE       0x02    /* Signal the thread to die. */
   #define GV_VOL_THREAD_DEAD      0x04    /* The thread has died. */
   #define GV_VOL_NEWBORN          0x08    /* The volume was just created. */
   
           LIST_HEAD(,gv_plex)     plexes;         /* List of attached plexes. */
           LIST_ENTRY(gv_volume)   volume;         /* Entry in vinum config. */
   
           struct g_provider       *provider;      /* Provider of this volume. */
   
   #ifdef  _KERNEL
           struct bio_queue_head   *wqueue;        /* BIO delayed request queue. */
   #else
           char                    *wpad; /* Padding for userland. */
   #endif
   
           struct gv_plex  *last_read_plex;
           struct gv_softc *vinumconf;     /* Pointer to the vinum config. */
   };
   
   #endif /* !_GEOM_VINUM_VAR_H */

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