583 lines
23 KiB
C
583 lines
23 KiB
C
/*-
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* Copyright (c) 1997, 1998
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* Nan Yang Computer Services Limited. All rights reserved.
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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 1.19 1999/03/23 02:48:20 grog Exp grog $
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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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/*
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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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enum constants {
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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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/* XXX Do we still need this? */
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MINVINUMSLICE = 1048576, /* minimum size of a slice */
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CDEV_MAJOR = 91, /* major number for character device */
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BDEV_MAJOR = 25, /* and block device */
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ROUND_ROBIN_READPOL = -1, /* round robin read policy */
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/* type field in minor number */
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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_DRIVE_TYPE = 3,
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VINUM_SUPERDEV_TYPE = 4, /* super device. */
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VINUM_RAWPLEX_TYPE = 5, /* anonymous plex */
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VINUM_RAWSD_TYPE = 6, /* anonymous subdisk */
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/* Shifts for the individual fields in the device */
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VINUM_TYPE_SHIFT = 28,
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VINUM_VOL_SHIFT = 0,
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VINUM_PLEX_SHIFT = 16,
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VINUM_SD_SHIFT = 20,
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VINUM_VOL_WIDTH = 8,
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VINUM_PLEX_WIDTH = 3,
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VINUM_SD_WIDTH = 8,
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/*
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* Shifts for the second half of raw plex and
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* subdisk numbers
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*/
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VINUM_RAWPLEX_SHIFT = 8, /* shift the second half this much */
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VINUM_RAWPLEX_WIDTH = 12, /* width of second half */
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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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/*
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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(v,p,s,t) ( (v << VINUM_VOL_SHIFT) \
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| (p << VINUM_PLEX_SHIFT) \
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| (s << VINUM_SD_SHIFT) \
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| (t << VINUM_TYPE_SHIFT) )
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/* Create block and character device minor numbers */
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#define VINUMBDEV(v,p,s,t) makedev (BDEV_MAJOR, VINUMMINOR (v, p, s, t))
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#define VINUMCDEV(v,p,s,t) makedev (CDEV_MAJOR, VINUMMINOR (v, p, s, t))
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/* Create a bit mask for x bits */
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#define MASK(x) ((1 << (x)) - 1)
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/* Create a raw block device minor number */
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#define VINUMRMINOR(d,t) ( ((d & MASK (VINUM_VOL_WIDTH)) << VINUM_VOL_SHIFT) \
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| ((d & ~MASK (VINUM_VOL_WIDTH)) \
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<< (VINUM_PLEX_SHIFT + VINUM_VOL_WIDTH)) \
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| (t << VINUM_TYPE_SHIFT) )
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#define VINUMRBDEV(d,t) makedev (BDEV_MAJOR, VINUMRMINOR (d, t))
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/* extract device type */
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#define DEVTYPE(x) ((minor (x) >> VINUM_TYPE_SHIFT) & 7)
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/*
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* This mess is used to catch people who compile
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* a debug vinum(8) and non-debug kernel module,
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* or the other way round.
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*/
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#ifdef VINUMDEBUG
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#define VINUM_SUPERDEV VINUMBDEV (1, 0, 0, VINUM_SUPERDEV_TYPE) /* superdevice number */
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#define VINUM_WRONGSUPERDEV VINUMBDEV (2, 0, 0, VINUM_SUPERDEV_TYPE) /* non-debug superdevice number */
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#else
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#define VINUM_SUPERDEV VINUMBDEV (2, 0, 0, VINUM_SUPERDEV_TYPE) /* superdevice number */
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#define VINUM_WRONGSUPERDEV VINUMBDEV (1, 0, 0, VINUM_SUPERDEV_TYPE) /* debug superdevice number */
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#endif
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#define VINUM_DAEMON_DEV VINUMBDEV (0, 0, 0, VINUM_SUPERDEV_TYPE) /* daemon superdevice number */
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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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INITIAL_LOCKS = 8, /* number of locks to allocate to a volume */
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DEFAULT_REVIVE_BLOCKSIZE = 65536, /* size of block to transfer in one op */
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VINUMHOSTNAMELEN = 32, /* host name field in label */
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};
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/* device numbers */
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/*
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* 31 30 28 27 20 19 18 16 15 8 7 0
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* |-----------------------------------------------------------------------------------------------|
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* |X | Type | Subdisk number | X| Plex | Major number | volume number |
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* |-----------------------------------------------------------------------------------------------|
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*
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* 0x2 03 1 19 06
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*
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* The fields in the minor number are interpreted as follows:
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*
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* Volume: Only type and volume number are relevant
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* Plex in volume: type, plex number in volume and volume number are relevant
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* raw plex: type, plex number is made of bits 27-16 and 7-0
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* raw subdisk: type, subdisk number is made of bits 27-16 and 7-0
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*/
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/* This doesn't get used. Consider removing it. */
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struct devcode {
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/*
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* CARE. These fields assume a big-endian word. On a
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* little-endian system, they're the wrong way around
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*/
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unsigned volume:8; /* up to 256 volumes */
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unsigned major:8; /* this is where the major number fits */
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unsigned plex:3; /* up to 8 plexes per volume */
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unsigned unused:1; /* up for grabs */
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unsigned sd:8; /* up to 256 subdisks per plex */
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unsigned type:3; /* type of object */
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/*
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* type field
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VINUM_VOLUME = 0,
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VINUM_PLEX = 1,
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VINUM_SUBDISK = 2,
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VINUM_DRIVE = 3,
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VINUM_SUPERDEV = 4,
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VINUM_RAWPLEX = 5,
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VINUM_RAWSD = 6 */
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unsigned signbit:1; /* to make 32 bits */
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};
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#define VINUM_DIR "/dev/vinum"
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#define VINUM_RDIR "/dev/rvinum"
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/*
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* These definitions help catch
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* userland/kernel mismatches.
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*/
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#if VINUMDEBUG
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#define VINUM_WRONGSUPERDEV_NAME VINUM_DIR"/control" /* normal super device */
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#define VINUM_SUPERDEV_NAME VINUM_DIR"/Control" /* debug super device */
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#else
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#define VINUM_WRONGSUPERDEV_NAME VINUM_DIR"/Control" /* debug super device */
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#define VINUM_SUPERDEV_NAME VINUM_DIR"/control" /* normal super device */
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#endif
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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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* Flags for all objects. Most of them only apply to
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* specific objects, but we have space for all in any
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* 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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};
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/* Global configuration information for the vinum subsystem */
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struct _vinum_conf {
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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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/* 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;
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#if VINUMDEBUG
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int lastrq;
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struct buf *lastbuf;
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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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* 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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off_t drive_size; /* total size in bytes of the drive.
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* This value includes the headers */
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};
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struct vinum_hdr {
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long long magic; /* we're long on magic numbers */
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/* XXX Get these right for big-endian */
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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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int config_length; /* size in bytes of each copy of the
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* configuration info.
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* This must be a multiple of the sector size. */
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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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/*** Drive definitions ***/
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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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* theroretically be a complete, unpartitioned disk
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*/
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struct drive {
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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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char devicename[MAXDRIVENAME]; /* name of the slice it's on */
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struct vnode *vp; /* vnode pointer */
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struct proc *p;
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struct vinum_label label; /* and the label information */
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struct partinfo partinfo; /* partition information */
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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 { /* 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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} *freelist;
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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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};
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/*** Subdisk definitions ***/
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struct sd {
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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 of the
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* plex to the very first part of the subdisk, in
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* sectors. For striped and RAID-5 plexes, only
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* the first stripe is 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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struct request *waitlist; /* list of requests waiting on revive op */
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char name[MAXSDNAME]; /* name of subdisk */
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};
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/*** Plex definitions ***/
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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_raid5 /* RAID5 plex */
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};
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struct plex {
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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 (max offset, in blocks) */
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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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/* Lock information */
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int locks; /* number of locks used */
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int alloclocks; /* number of locks allocated */
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struct rangelock *lock; /* ranges of locked addresses */
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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 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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char name[MAXPLEXNAME]; /* name of plex */
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};
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/*** Volume definitions ***/
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struct 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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int last_plex_read; /* index of plex used for last read,
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* for round-robin */
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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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/* Unlike subdisks in the plex, space for the plex pointers is static */
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int plex[MAXPLEX]; /* index of plexes */
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char name[MAXVOLNAME]; /* name of volume */
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struct disklabel label; /* for DIOCGPART */
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};
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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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#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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/* 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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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[16];
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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, /* found an SD which is down */
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sd_crashedstate = 4, /* found an SD which is crashed */
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sd_obsoletestate = 8, /* found an SD which is obsolete */
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sd_stalestate = 16, /* found an SD which is stale */
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sd_rebornstate = 32, /* found an SD which is reborn */
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sd_upstate = 64, /* found an SD which is up */
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sd_initstate = 128, /* found an SD which is init */
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sd_otherstate = 256 /* found an SD 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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#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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};
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#ifdef KERNEL
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#define longjmp LongJmp /* test our longjmps */
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#endif
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#endif
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