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33953e5e97
Change from lkm to kld Add field plexsdno to sd struct Add flag VF_NEWBORN to drive, sd, plex and volume structs, indicating that the object has just been created. Add object types for raw (unattached) plexes and subdisks Remove definitions of VOLNO, PLEXNO and SDNO (now functions Volno, Plexno and Sdno) Move revive parameters from struct plex to struct sd. struct plex: maintain a count of the number of inaccessible subdisks. remove defective and unmapped regions. Debug flags: make an enum (previously #define) Set default revive block size to 64kB (was 32 kB)
529 lines
22 KiB
C
529 lines
22 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 1.18 1999/01/15 06:00:24 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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/* 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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/* Shifts for the second half of raw plex and
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* subdisk numbers */
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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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/* Create a block device number */
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#define VINUMBDEV(v,p,s,t) ((BDEV_MAJOR << MAJORDEV_SHIFT) \
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| (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 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 number */
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#define VINUMRBDEV(d,t) ((BDEV_MAJOR << MAJORDEV_SHIFT) \
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| ((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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/* And a character device number */
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#define VINUMCDEV(v,p,s,t) ((CDEV_MAJOR << MAJORDEV_SHIFT) \
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| (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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/* extract device type */
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#define DEVTYPE(x) ((x >> VINUM_TYPE_SHIFT) & 7)
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VINUM_SUPERDEV = VINUMBDEV(0, 0, 0, VINUM_SUPERDEV_TYPE), /* superdevice number */
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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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struct devcode {
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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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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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/* 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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#define VINUM_SUPERDEV_NAME VINUM_DIR"/control"
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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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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_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_KERNELOP = 0x8000, /* we're performing ops from kernel space */
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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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};
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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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int opencount; /* number of times we've been opened */
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#if VINUMDEBUG
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int lastrq;
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struct buf *lastbuf;
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struct rqinfo **rqipp;
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struct rqinfo *rqinfop;
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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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/* Slice header
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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) | 2
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* |--------------------------------------|
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* | |
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* | Configuration info, first copy | 3
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* | |
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* |--------------------------------------|
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* | |
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* | Configuration info, second copy | 3 + 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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/* 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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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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/* 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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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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dev_t dev; /* and device number */
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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;
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long sectors;
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} *freelist;
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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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/* 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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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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int pid; /* pid of process which opened us */
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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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int pid; /* pid of process which opened us */
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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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dev_t devno; /* device number */
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int flags; /* status and configuration flags */
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int opencount; /* number of opens (all the same process) */
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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 disk; /* disk index */
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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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pid_t pid; /* pid of locker */
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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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/* 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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#define EXPAND(table, element, oldcount, increment) \
|
|
{ \
|
|
expand_table ((void **) &table, \
|
|
oldcount * sizeof (element), \
|
|
(oldcount + increment) * sizeof (element) ); \
|
|
oldcount += increment; \
|
|
}
|
|
|
|
/* Information on vinum's memory usage */
|
|
struct meminfo {
|
|
int mallocs; /* number of malloced blocks */
|
|
int total_malloced; /* total amount malloced */
|
|
int highwater; /* maximum number of mallocs */
|
|
struct mc *malloced; /* pointer to kernel table */
|
|
};
|
|
|
|
struct mc {
|
|
int seq;
|
|
int size;
|
|
short line;
|
|
short flags;
|
|
#define ALLOC_KVA 1 /* allocated via kva calls */
|
|
int *databuf; /* really vm_object_t */
|
|
caddr_t address;
|
|
char file[16];
|
|
};
|
|
|
|
/* These enums are used by the state transition
|
|
* routines. They're in bit map format:
|
|
*
|
|
* Bit 0: Other plexes in the volume are down
|
|
* Bit 1: Other plexes in the volume are up
|
|
* Bit 2: The current plex is up
|
|
* Maybe they should be local to
|
|
* state.c */
|
|
enum volplexstate {
|
|
volplex_onlyusdown = 0, /* we're the only plex, and we're down */
|
|
volplex_alldown, /* 1: another plex is down, and so are we */
|
|
volplex_otherup, /* 2: another plex is up */
|
|
volplex_otherupdown, /* other plexes are up and down */
|
|
volplex_onlyus, /* 4: we're up and alone */
|
|
volplex_onlyusup, /* only we are up, others are down */
|
|
volplex_allup, /* all plexes are up */
|
|
volplex_someup /* some plexes are up, including us */
|
|
};
|
|
|
|
/* state map for plex */
|
|
enum sdstates {
|
|
sd_emptystate = 1,
|
|
sd_downstate = 2, /* found an SD which is down */
|
|
sd_crashedstate = 4, /* found an SD which is crashed */
|
|
sd_obsoletestate = 8, /* found an SD which is obsolete */
|
|
sd_stalestate = 16, /* found an SD which is stale */
|
|
sd_rebornstate = 32, /* found an SD which is reborn */
|
|
sd_upstate = 64, /* found an SD which is up */
|
|
sd_initstate = 128, /* found an SD which is init */
|
|
sd_otherstate = 256 /* found an SD in some other state */
|
|
};
|
|
|
|
/* This is really just a parameter to pass to
|
|
* set_<foo>_state, but since it needs to be known
|
|
* in the external definitions, we need to define
|
|
* it here */
|
|
enum setstateflags {
|
|
setstate_none = 0, /* no flags */
|
|
setstate_force = 1, /* force the state change */
|
|
setstate_configuring = 2, /* we're currently configuring, don't save */
|
|
};
|
|
|
|
#ifdef VINUMDEBUG
|
|
/* Debugging stuff */
|
|
enum debugflags {
|
|
DEBUG_ADDRESSES = 1, /* show buffer information during requests */
|
|
DEBUG_NUMOUTPUT = 2, /* show the value of vp->v_numoutput */
|
|
DEBUG_RESID = 4, /* go into debugger in complete_rqe */
|
|
DEBUG_LASTREQS = 8, /* keep a circular buffer of last requests */
|
|
DEBUG_REVIVECONFLICT = 16, /* print info about revive conflicts */
|
|
DEBUG_REMOTEGDB = 256, /* go into remote gdb */
|
|
};
|
|
|
|
#endif
|