74f2cc2c9c
of the struct plex, which tore apart the mutex linked lists when the plex table was expanded. Now we maintain a pool of mutexes (currently 32) to be shared by all plexes. This is still a lot better than the splhigh() method used in other architectures. expand_table: Add parameters file and line if we're debugging. Approved by: re (jhb)
401 lines
14 KiB
C
401 lines
14 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: vinumvar.h,v 1.33 2003/05/23 01:09:23 grog Exp $
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* $FreeBSD$
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*/
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#include <sys/time.h>
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#include <dev/vinum/vinumstate.h>
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#include <sys/mutex.h>
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/* Directory for device nodes. */
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#define VINUM_DIR "/dev/vinum"
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/*
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* Some configuration maxima. They're an enum because
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* we can't define global constants. Sorry about that.
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*
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* These aren't as bad as they look: most of them are soft limits.
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*/
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#define VINUMROOT
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enum constants {
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/*
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* Current version of the data structures. This
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* is used to ensure synchronization between
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* kernel module and userland vinum(8).
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*/
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VINUMVERSION = 1,
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VINUM_HEADER = 512, /* size of header on disk */
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MAXCONFIGLINE = 1024, /* maximum size of a single config line */
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MINVINUMSLICE = 1048576, /* minimum size of a slice */
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VINUM_CDEV_MAJOR = 91, /* major number for character device */
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ROUND_ROBIN_READPOL = -1, /* round robin read policy */
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/*
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* Type field in high-order two bits of minor
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* number. Subdisks are in fact both type 2 and
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* type 3, giving twice the number of subdisks.
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* This causes some ugliness in the code.
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*/
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VINUM_VOLUME_TYPE = 0,
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VINUM_PLEX_TYPE = 1,
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VINUM_SD_TYPE = 2,
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VINUM_SD2_TYPE = 3,
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/*
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* Define a minor device number.
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* This is not used directly; instead, it's
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* called by the other macros.
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*/
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#define VINUMMINOR(o,t) ((o & 0xff) | ((o & 0x3fff00) << 8) | (t << VINUM_TYPE_SHIFT))
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VINUM_TYPE_SHIFT = 30,
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VINUM_MAXVOL = 0x3ffffd, /* highest numbered volume */
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/*
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* The super device and the daemon device are
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* magic: they're the two highest-numbered
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* volumes.
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*/
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VINUM_SUPERDEV_VOL = 0x3ffffe,
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VINUM_DAEMON_VOL = 0x3fffff,
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VINUM_MAXPLEX = 0x3fffff,
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VINUM_MAXSD = 0x7fffff,
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#define VINUM_SUPERDEV_MINOR VINUMMINOR (VINUM_SUPERDEV_VOL, VINUM_VOLUME_TYPE)
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#define VINUM_DAEMON_MINOR VINUMMINOR (VINUM_DAEMON_VOL, VINUM_VOLUME_TYPE)
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/*
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* Mask for the number part of each object.
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* Plexes and volumes are the same, subdisks use
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* the low-order bit of the type field and thus
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* have twice the number.
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*/
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MAJORDEV_SHIFT = 8,
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MAXPLEX = 8, /* maximum number of plexes in a volume */
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MAXSD = 256, /* maximum number of subdisks in a plex */
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MAXDRIVENAME = 32, /* maximum length of a device name */
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MAXSDNAME = 64, /* maximum length of a subdisk name */
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MAXPLEXNAME = 64, /* maximum length of a plex name */
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MAXVOLNAME = 64, /* maximum length of a volume name */
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MAXNAME = 64, /* maximum length of any name */
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#define OBJTYPE(x) ((minor(x) >> VINUM_TYPE_SHIFT) & 3)
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/* Create device minor numbers */
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#define VINUMDEV(o, t) makedev (VINUM_CDEV_MAJOR, VINUMMINOR (o, t))
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#define VINUM_VOL(v) makedev (VINUM_CDEV_MAJOR, \
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VINUMMINOR (v, VINUM_VOLUME_TYPE))
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#define VINUM_PLEX(p) makedev (VINUM_CDEV_MAJOR, \
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VINUMMINOR (p, VINUM_PLEX_TYPE))
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#define VINUM_SD(s) makedev (VINUM_CDEV_MAJOR, \
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VINUMMINOR (s, VINUM_SD_TYPE))
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/* extract device type */
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#define DEVTYPE(x) ((minor (x) >> VINUM_TYPE_SHIFT) & 3)
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#define VINUM_SUPERDEV_NAME VINUM_DIR"/control" /* normal super device */
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#define VINUM_DAEMON_DEV_NAME VINUM_DIR"/controld" /* super device for daemon only */
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/*
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* the number of object entries to cater for initially, and also the
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* value by which they are incremented. It doesn't take long
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* to extend them, so theoretically we could start with 1 of each, but
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* it's untidy to allocate such small areas. These values are
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* probably too small.
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*/
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INITIAL_DRIVES = 4,
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INITIAL_VOLUMES = 4,
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INITIAL_PLEXES = 8,
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INITIAL_SUBDISKS = 16,
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INITIAL_SUBDISKS_IN_PLEX = 4, /* number of subdisks to allocate to a plex */
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INITIAL_SUBDISKS_IN_DRIVE = 4, /* number of subdisks to allocate to a drive */
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INITIAL_DRIVE_FREELIST = 16, /* number of entries in drive freelist */
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PLEX_REGION_TABLE_SIZE = 8, /* number of entries in plex region tables */
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PLEX_LOCKS = 256, /* number of locks to allocate to a plex */
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PLEXMUTEXES = 32,
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MAX_REVIVE_BLOCKSIZE = MAXPHYS, /* maximum revive block size */
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DEFAULT_REVIVE_BLOCKSIZE = 65536, /* default revive block size */
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VINUMHOSTNAMELEN = 32, /* host name field in label */
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};
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/*
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* Slice header
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*
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* Vinum drives start with this structure:
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*
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*\ Sector
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* |--------------------------------------|
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* | PDP-11 memorial boot block | 0
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* |--------------------------------------|
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* | Disk label, maybe | 1
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* |--------------------------------------|
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* | Slice definition (vinum_hdr) | 8
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* |--------------------------------------|
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* | |
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* | Configuration info, first copy | 9
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* | |
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* |--------------------------------------|
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* | |
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* | Configuration info, second copy | 9 + size of config
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* | |
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* |--------------------------------------|
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*/
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/* Sizes and offsets of our information */
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enum {
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VINUM_LABEL_OFFSET = 4096, /* offset of vinum label */
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VINUMHEADERLEN = 512, /* size of vinum label */
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VINUM_CONFIG_OFFSET = 4608, /* offset of first config copy */
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MAXCONFIG = 65536, /* and size of config copy */
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DATASTART = (MAXCONFIG * 2 + VINUM_CONFIG_OFFSET) / DEV_BSIZE /* this is where the data starts */
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};
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/*
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* hostname is 256 bytes long, but we don't need to shlep
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* multiple copies in vinum. We use the host name just
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* to identify this system, and 32 bytes should be ample
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* for that purpose
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*/
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struct vinum_label {
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char sysname[VINUMHOSTNAMELEN]; /* system name at time of creation */
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char name[MAXDRIVENAME]; /* our name of the drive */
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struct timeval date_of_birth; /* the time it was created */
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struct timeval last_update; /* and the time of last update */
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/*
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* total size in bytes of the drive. This value
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* includes the headers.
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*/
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off_t drive_size;
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};
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struct vinum_hdr {
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uint64_t magic; /* we're long on magic numbers */
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#define VINUM_MAGIC 22322600044678729LL /* should be this */
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#define VINUM_NOMAGIC 22322600044678990LL /* becomes this after obliteration */
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/*
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* Size in bytes of each copy of the
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* configuration info. This must be a multiple
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* of the sector size.
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*/
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int config_length;
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struct vinum_label label; /* unique label */
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};
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/* Information returned from read_drive_label */
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enum drive_label_info {
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DL_CANT_OPEN, /* invalid partition */
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DL_NOT_OURS, /* valid partition, but no vinum label */
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DL_DELETED_LABEL, /* valid partition, deleted label found */
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DL_WRONG_DRIVE, /* drive name doesn't match */
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DL_OURS /* valid partition and label found */
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};
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/* kinds of plex organization */
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enum plexorg {
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plex_disorg, /* disorganized */
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plex_concat, /* concatenated plex */
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plex_striped, /* striped plex */
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plex_raid4, /* RAID4 plex */
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plex_raid5 /* RAID5 plex */
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};
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/* Recognize plex organizations */
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#define isstriped(p) (p->organization >= plex_striped) /* RAID 1, 4 or 5 */
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#define isparity(p) (p->organization >= plex_raid4) /* RAID 4 or 5 */
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/* Address range definitions, for locking volumes */
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struct rangelock {
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daddr_t stripe; /* address + 1 of the range being locked */
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struct buf *bp; /* user's buffer pointer */
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};
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struct drive_freelist { /* sorted list of free space on drive */
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u_int64_t offset; /* offset of entry */
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u_int64_t sectors; /* and length in sectors */
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};
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/*
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* Include the structure definitions shared
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* between userland and kernel.
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*/
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#ifdef _KERNEL
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#include <dev/vinum/vinumobj.h>
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#undef _KERNEL
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#include <dev/vinum/vinumobj.h>
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#define _KERNEL
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#else
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#include <dev/vinum/vinumobj.h>
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#endif
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/*
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* Table expansion. Expand table, which contains oldcount
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* entries of type element, by increment entries, and change
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* oldcount accordingly
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*/
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#ifdef VINUMDEBUG
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#define EXPAND(table, element, oldcount, increment) \
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{ \
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expand_table ((void **) &table, \
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oldcount * sizeof (element), \
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(oldcount + increment) * sizeof (element), \
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__FILE__, \
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__LINE__ ); \
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oldcount += increment; \
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}
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#else
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#define EXPAND(table, element, oldcount, increment) \
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{ \
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expand_table ((void **) &table, \
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oldcount * sizeof (element), \
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(oldcount + increment) * sizeof (element)); \
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oldcount += increment; \
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}
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#endif
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/* Information on vinum's memory usage */
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struct meminfo {
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int mallocs; /* number of malloced blocks */
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int total_malloced; /* total amount malloced */
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int highwater; /* maximum number of mallocs */
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struct mc *malloced; /* pointer to kernel table */
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};
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#define MCFILENAMELEN 16
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struct mc {
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struct timeval time;
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int seq;
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int size;
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short line;
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caddr_t address;
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char file[MCFILENAMELEN];
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};
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/*
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* These enums are used by the state transition
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* routines. They're in bit map format:
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*
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* Bit 0: Other plexes in the volume are down
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* Bit 1: Other plexes in the volume are up
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* Bit 2: The current plex is up
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* Maybe they should be local to
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* state.c
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*/
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enum volplexstate {
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volplex_onlyusdown = 0, /* 0: we're the only plex, and we're down */
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volplex_alldown, /* 1: another plex is down, and so are we */
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volplex_otherup, /* 2: another plex is up */
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volplex_otherupdown, /* 3: other plexes are up and down */
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volplex_onlyus, /* 4: we're up and alone */
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volplex_onlyusup, /* 5: only we are up, others are down */
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volplex_allup, /* 6: all plexes are up */
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volplex_someup /* 7: some plexes are up, including us */
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};
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/* state map for plex */
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enum sdstates {
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sd_emptystate = 1,
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sd_downstate = 2, /* SD is down */
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sd_crashedstate = 4, /* SD is crashed */
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sd_obsoletestate = 8, /* SD is obsolete */
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sd_stalestate = 16, /* SD is stale */
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sd_rebornstate = 32, /* SD is reborn */
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sd_upstate = 64, /* SD is up */
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sd_initstate = 128, /* SD is initializing */
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sd_initializedstate = 256, /* SD is initialized */
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sd_otherstate = 512, /* SD is in some other state */
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};
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/*
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* This is really just a parameter to pass to
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* set_<foo>_state, but since it needs to be known
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* in the external definitions, we need to define
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* it here
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*/
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enum setstateflags {
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setstate_none = 0, /* no flags */
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setstate_force = 1, /* force the state change */
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setstate_configuring = 2, /* we're currently configuring, don't save */
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};
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/* Operations for parityops to perform. */
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enum parityop {
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checkparity,
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rebuildparity,
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rebuildandcheckparity, /* rebuildparity with the -v option */
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};
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#ifdef VINUMDEBUG
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/* Debugging stuff */
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enum debugflags {
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DEBUG_ADDRESSES = 1, /* show buffer information during requests */
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DEBUG_NUMOUTPUT = 2, /* show the value of vp->v_numoutput */
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DEBUG_RESID = 4, /* go into debugger in complete_rqe */
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DEBUG_LASTREQS = 8, /* keep a circular buffer of last requests */
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DEBUG_REVIVECONFLICT = 16, /* print info about revive conflicts */
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DEBUG_EOFINFO = 32, /* print info about EOF detection */
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DEBUG_MEMFREE = 64, /* keep info about Frees */
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DEBUG_BIGDRIVE = 128, /* pretend our drives are 100 times the size */
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DEBUG_REMOTEGDB = 256, /* go into remote gdb */
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DEBUG_WARNINGS = 512, /* log various relatively harmless warnings */
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DEBUG_LOCKREQS = 1024, /* log locking requests */
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};
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#ifdef _KERNEL
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#ifdef __i386__
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#define longjmp LongJmp /* test our longjmps */
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#endif
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#endif
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#endif
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/* Local Variables: */
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/* fill-column: 50 */
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/* End: */
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