311 lines
13 KiB
C
311 lines
13 KiB
C
/*-
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* Copyright (c) 1997, 1998, 1999
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
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*
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* Written by Greg Lehey
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*
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* This software is distributed under the so-called ``Berkeley
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* License'':
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Nan Yang Computer
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* Services Limited.
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* 4. Neither the name of the Company nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* This software is provided ``as is'', and any express or implied
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall the company or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: vinumobj.h,v 1.2 2001/05/23 23:04:18 grog Exp grog $
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* $FreeBSD$
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*/
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/*
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* Definitions of Vinum objects: drive, subdisk, plex and volume.
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* This file is included both by userland programs and by kernel code.
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* The userland structures are a subset of the kernel structures, and
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* all userland fields are at the beginning, so that a simple copy in
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* the length of the userland structure will be sufficient. In order
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* to perform this copy, vinumioctl must know both structures, so it
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* includes this file again with _KERNEL reset.
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*/
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#ifndef _KERNEL
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/*
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* Flags for all objects. Most of them only apply
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* to specific objects, but we currently have
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* space for all in any 32 bit flags word.
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*/
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enum objflags {
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VF_LOCKED = 1, /* somebody has locked access to this object */
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VF_LOCKING = 2, /* we want access to this object */
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VF_OPEN = 4, /* object has openers */
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VF_WRITETHROUGH = 8, /* volume: write through */
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VF_INITED = 0x10, /* unit has been initialized */
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VF_WLABEL = 0x20, /* label area is writable */
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VF_LABELLING = 0x40, /* unit is currently being labelled */
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VF_WANTED = 0x80, /* someone is waiting to obtain a lock */
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VF_RAW = 0x100, /* raw volume (no file system) */
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VF_LOADED = 0x200, /* module is loaded */
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VF_CONFIGURING = 0x400, /* somebody is changing the config */
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VF_WILL_CONFIGURE = 0x800, /* somebody wants to change the config */
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VF_CONFIG_INCOMPLETE = 0x1000, /* haven't finished changing the config */
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VF_CONFIG_SETUPSTATE = 0x2000, /* set a volume up if all plexes are empty */
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VF_READING_CONFIG = 0x4000, /* we're reading config database from disk */
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VF_FORCECONFIG = 0x8000, /* configure drives even with different names */
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VF_NEWBORN = 0x10000, /* for objects: we've just created it */
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VF_CONFIGURED = 0x20000, /* for drives: we read the config */
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VF_STOPPING = 0x40000, /* for vinum_conf: stop on last close */
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VF_DAEMONOPEN = 0x80000, /* the daemon has us open (only superdev) */
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VF_CREATED = 0x100000, /* for volumes: freshly created, more then new */
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VF_HOTSPARE = 0x200000, /* for drives: use as hot spare */
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VF_RETRYERRORS = 0x400000, /* don't down subdisks on I/O errors */
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VF_HASDEBUG = 0x800000, /* set if we support debug */
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};
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#endif
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/* Global configuration information for the vinum subsystem */
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#ifdef _KERNEL
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struct _vinum_conf
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#else
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struct __vinum_conf
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#endif
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{
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int version; /* version of structures */
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#ifdef _KERNEL
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/* Pointers to vinum structures */
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struct drive *drive;
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struct sd *sd;
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struct plex *plex;
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struct volume *volume;
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#else
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/* Pointers to vinum structures */
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struct _drive *drive;
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struct _sd *sd;
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struct _plex *plex;
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struct _volume *volume;
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#endif
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/* the number allocated */
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int drives_allocated;
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int subdisks_allocated;
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int plexes_allocated;
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int volumes_allocated;
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/* and the number currently in use */
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int drives_used;
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int subdisks_used;
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int plexes_used;
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int volumes_used;
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int flags; /* see above */
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#define VINUM_MAXACTIVE 30000 /* maximum number of active requests */
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int active; /* current number of requests outstanding */
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int maxactive; /* maximum number of requests ever outstanding */
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#ifdef _KERNEL
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#ifdef VINUMDEBUG
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struct request *lastrq;
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struct buf *lastbuf;
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#endif
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#endif
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};
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/* Use these defines to simplify code */
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#define DRIVE vinum_conf.drive
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#define SD vinum_conf.sd
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#define PLEX vinum_conf.plex
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#define VOL vinum_conf.volume
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#define VFLAGS vinum_conf.flags
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/*
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* A drive corresponds to a disk slice. We use a different term to show
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* the difference in usage: it doesn't have to be a slice, and could
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* theoretically be a complete, unpartitioned disk
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*/
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#ifdef _KERNEL
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struct drive
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#else
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struct _drive
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#endif
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{
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char devicename[MAXDRIVENAME]; /* name of the slice it's on */
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struct vinum_label label; /* and the label information */
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enum drivestate state; /* current state */
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int flags; /* flags */
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int subdisks_allocated; /* number of entries in sd */
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int subdisks_used; /* and the number used */
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int blocksize; /* size of fs blocks */
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int pid; /* of locker */
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u_int64_t sectors_available; /* number of sectors still available */
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int secsperblock;
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int lasterror; /* last error on drive */
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int driveno; /* index of drive in vinum_conf */
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int opencount; /* number of up subdisks */
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u_int64_t reads; /* number of reads on this drive */
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u_int64_t writes; /* number of writes on this drive */
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u_int64_t bytes_read; /* number of bytes read */
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u_int64_t bytes_written; /* number of bytes written */
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#define DRIVE_MAXACTIVE 30000 /* maximum number of active requests */
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int active; /* current number of requests outstanding */
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int maxactive; /* maximum number of requests ever outstanding */
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int freelist_size; /* number of entries alloced in free list */
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int freelist_entries; /* number of entries used in free list */
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struct drive_freelist *freelist; /* sorted list of free space on drive */
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#ifdef _KERNEL
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struct partinfo partinfo; /* partition information */
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dev_t dev; /* device information */
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#ifdef VINUMDEBUG
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char lockfilename[16]; /* name of file from which we were locked */
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int lockline; /* and the line number */
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#endif
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#endif
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};
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#ifdef _KERNEL
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struct sd
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#else
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struct _sd
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#endif
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{
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char name[MAXSDNAME]; /* name of subdisk */
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enum sdstate state; /* state */
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int flags;
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int lasterror; /* last error occurred */
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/* offsets in blocks */
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int64_t driveoffset; /* offset on drive */
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/*
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* plexoffset is the offset from the beginning
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* of the plex to the very first part of the
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* subdisk, in sectors. For striped, RAID-4 and
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* RAID-5 plexes, only the first stripe is
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* located at this offset
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*/
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int64_t plexoffset; /* offset in plex */
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u_int64_t sectors; /* and length in sectors */
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int plexno; /* index of plex, if it belongs */
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int driveno; /* index of the drive on which it is located */
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int sdno; /* our index in vinum_conf */
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int plexsdno; /* and our number in our plex */
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/* (undefined if no plex) */
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u_int64_t reads; /* number of reads on this subdisk */
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u_int64_t writes; /* number of writes on this subdisk */
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u_int64_t bytes_read; /* number of bytes read */
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u_int64_t bytes_written; /* number of bytes written */
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/* revive parameters */
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u_int64_t revived; /* block number of current revive request */
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int revive_blocksize; /* revive block size (bytes) */
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int revive_interval; /* and time to wait between transfers */
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pid_t reviver; /* PID of reviving process */
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/* init parameters */
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u_int64_t initialized; /* block number of current init request */
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int init_blocksize; /* init block size (bytes) */
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int init_interval; /* and time to wait between transfers */
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#ifdef _KERNEL
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struct request *waitlist; /* list of requests waiting on revive op */
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dev_t dev; /* associated device */
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#endif
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};
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#ifdef _KERNEL
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struct plex
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#else
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struct _plex
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#endif
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{
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enum plexorg organization; /* Plex organization */
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enum plexstate state; /* and current state */
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u_int64_t length; /* total length of plex (sectors) */
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int flags;
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int stripesize; /* size of stripe or raid band, in sectors */
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int subdisks; /* number of associated subdisks */
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int subdisks_allocated; /* number of subdisks allocated space for */
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int *sdnos; /* list of component subdisks */
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int plexno; /* index of plex in vinum_conf */
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int volno; /* index of volume */
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int volplexno; /* number of plex in volume */
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/* Statistics */
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u_int64_t reads; /* number of reads on this plex */
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u_int64_t writes; /* number of writes on this plex */
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u_int64_t bytes_read; /* number of bytes read */
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u_int64_t bytes_written; /* number of bytes written */
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u_int64_t recovered_reads; /* number of recovered read operations */
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u_int64_t degraded_writes; /* number of degraded writes */
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u_int64_t parityless_writes; /* number of parityless writes */
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u_int64_t multiblock; /* requests that needed more than one block */
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u_int64_t multistripe; /* requests that needed more than one stripe */
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int sddowncount; /* number of subdisks down */
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/* Lock information */
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int usedlocks; /* number currently in use */
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int lockwaits; /* and number of waits for locks */
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off_t checkblock; /* block number for parity op */
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char name[MAXPLEXNAME]; /* name of plex */
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#ifdef _KERNEL
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struct rangelock *lock; /* ranges of locked addresses */
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struct mtx lockmtx;
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dev_t dev; /* associated device */
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#endif
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};
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#ifdef _KERNEL
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struct volume
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#else
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struct _volume
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#endif
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{
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char name[MAXVOLNAME]; /* name of volume */
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enum volumestate state; /* current state */
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int plexes; /* number of plexes */
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int preferred_plex; /* plex to read from, -1 for round-robin */
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/*
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* index of plex used for last read, for
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* round-robin.
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*/
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int last_plex_read;
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int volno; /* volume number */
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int flags; /* status and configuration flags */
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int openflags; /* flags supplied to last open(2) */
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u_int64_t size; /* size of volume */
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int blocksize; /* logical block size */
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int active; /* number of outstanding requests active */
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int subops; /* and the number of suboperations */
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/* Statistics */
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u_int64_t bytes_read; /* number of bytes read */
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u_int64_t bytes_written; /* number of bytes written */
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u_int64_t reads; /* number of reads on this volume */
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u_int64_t writes; /* number of writes on this volume */
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u_int64_t recovered_reads; /* reads recovered from another plex */
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/*
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* Unlike subdisks in the plex, space for the
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* plex pointers is static.
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*/
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int plex[MAXPLEX]; /* index of plexes */
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#ifdef _KERNEL
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struct disklabel label; /* for DIOCGPART */
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dev_t dev; /* associated device */
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#endif
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};
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