12653dec9d
sends them down, and takes care of the finished bios. This makes it easier to handle I/O errors at drive level.
303 lines
11 KiB
C
303 lines
11 KiB
C
/*
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* Copyright (c) 2004 Lukas Ertl
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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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* Parts 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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* 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 * 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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* $FreeBSD$
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*/
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#ifndef _GEOM_VINUM_VAR_H_
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#define _GEOM_VINUM_VAR_H_
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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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#define GV_HDR_OFFSET 4096 /* Offset of vinum header. */
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#define GV_HDR_LEN 512 /* Size of vinum header. */
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#define GV_CFG_OFFSET 4608 /* Offset of first config copy. */
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#define GV_CFG_LEN 65536 /* Size of config copy. */
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/* This is where the actual data starts. */
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#define GV_DATA_START (GV_CFG_LEN * 2 + GV_CFG_OFFSET)
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/* #define GV_DATA_START (GV_CFG_LEN * 2 + GV_HDR_LEN) */
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#define GV_MAXDRIVENAME 32 /* Maximum length of a device name. */
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#define GV_MAXSDNAME 64 /* Maximum length of a subdisk name. */
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#define GV_MAXPLEXNAME 64 /* Maximum length of a plex name. */
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#define GV_MAXVOLNAME 64 /* Maximum length of a volume name. */
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/* Command line flags. */
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#define GV_FLAG_R 0x01
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#define GV_FLAG_S 0x02
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#define GV_FLAG_V 0x04
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#define GV_FLAG_VV 0x08
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#define GV_FLAG_F 0x10
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/* Object types. */
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#define GV_TYPE_VOL 1
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#define GV_TYPE_PLEX 2
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#define GV_TYPE_SD 3
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#define GV_TYPE_DRIVE 4
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/* State changing flags. */
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#define GV_SETSTATE_FORCE 0x1
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#define GV_SETSTATE_CONFIG 0x2
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/* Subdisk state bitmaps for plexes. */
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#define GV_SD_DOWNSTATE 0x01 /* Subdisk is down. */
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#define GV_SD_STALESTATE 0x02 /* Subdisk is stale. */
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#define GV_SD_INITSTATE 0x04 /* Subdisk is initializing. */
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#define GV_SD_UPSTATE 0x08 /* Subdisk is up. */
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/* Synchronization/initialization request sizes. */
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#define GV_MIN_SYNCSIZE 512
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#define GV_MAX_SYNCSIZE MAXPHYS
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#define GV_DFLT_SYNCSIZE 65536
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/* Flags for BIOs, as they are processed within vinum. */
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#define GV_BIO_DONE 0x01
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#define GV_BIO_MALLOC 0x02
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#define GV_BIO_ONHOLD 0x04
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/*
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* hostname is 256 bytes long, but we don't need to shlep multiple copies in
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* vinum. We use the host name just to identify this system, and 32 bytes
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* should be ample for that purpose.
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*/
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#define GV_HOSTNAME_LEN 32
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struct gv_label {
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char sysname[GV_HOSTNAME_LEN]; /* System name at creation time. */
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char name[GV_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 incl. headers. */
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};
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/* The 'header' of each valid vinum drive. */
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struct gv_hdr {
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uint64_t magic;
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#define GV_MAGIC 22322600044678729LL
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#define GV_NOMAGIC 22322600044678990LL
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int config_length;
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struct gv_label label;
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};
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/* A single freelist entry of a drive. */
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struct gv_freelist {
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off_t size; /* Size of this free slot. */
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off_t offset; /* Offset on the drive. */
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LIST_ENTRY(gv_freelist) freelist;
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};
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/*
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* Since we share structures between userland and kernel, we need this helper
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* struct instead of struct bio_queue_head and friends. Maybe I find a proper
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* solution some day.
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*/
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struct gv_bioq {
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struct bio *bp;
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TAILQ_ENTRY(gv_bioq) queue;
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};
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/* This struct contains the main vinum config. */
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struct gv_softc {
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/*struct mtx config_mtx; XXX not yet */
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/* Linked lists of all objects in our setup. */
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LIST_HEAD(,gv_drive) drives; /* All drives. */
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LIST_HEAD(,gv_plex) plexes; /* All plexes. */
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LIST_HEAD(,gv_sd) subdisks; /* All subdisks. */
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LIST_HEAD(,gv_volume) volumes; /* All volumes. */
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struct g_geom *geom; /* Pointer to our VINUM geom. */
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};
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/* softc for a drive. */
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struct gv_drive {
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char name[GV_MAXDRIVENAME]; /* The name of this drive. */
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char device[GV_MAXDRIVENAME]; /* Associated device. */
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int state; /* The state of this drive. */
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#define GV_DRIVE_DOWN 0
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#define GV_DRIVE_UP 1
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off_t size; /* Size of this drive. */
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off_t avail; /* Available space. */
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int sdcount; /* Number of subdisks. */
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int flags;
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#define GV_DRIVE_THREAD_ACTIVE 0x01 /* Drive has an active worker thread. */
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#define GV_DRIVE_THREAD_DIE 0x02 /* Signal the worker thread to die. */
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#define GV_DRIVE_THREAD_DEAD 0x04 /* The worker thread has died. */
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struct gv_hdr *hdr; /* The drive header. */
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int freelist_entries; /* Count of freelist entries. */
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LIST_HEAD(,gv_freelist) freelist; /* List of freelist entries. */
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LIST_HEAD(,gv_sd) subdisks; /* Subdisks on this drive. */
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LIST_ENTRY(gv_drive) drive; /* Entry in the vinum config. */
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TAILQ_HEAD(,gv_bioq) bqueue; /* BIO queue of this drive. */
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struct mtx bqueue_mtx; /* Mtx. to protect the queue. */
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struct g_geom *geom; /* The geom of this drive. */
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struct gv_softc *vinumconf; /* Pointer to the vinum conf. */
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};
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/* softc for a subdisk. */
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struct gv_sd {
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char name[GV_MAXSDNAME]; /* The name of this subdisk. */
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off_t size; /* The size of this subdisk. */
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off_t drive_offset; /* Offset in the underlying drive. */
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off_t plex_offset; /* Offset in the associated plex. */
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int state; /* The state of this subdisk. */
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#define GV_SD_DOWN 0
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#define GV_SD_STALE 1
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#define GV_SD_INITIALIZING 2
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#define GV_SD_REVIVING 3
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#define GV_SD_UP 4
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off_t initialized; /* Count of initialized bytes. */
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int init_size; /* Initialization read/write size. */
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int init_error; /* Flag error on initialization. */
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int flags;
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#define GV_SD_NEWBORN 0x01 /* Subdisk was just created. */
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#define GV_SD_INITCANCEL 0x02 /* Cancel initialization process. */
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char drive[GV_MAXDRIVENAME]; /* Name of underlying drive. */
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char plex[GV_MAXPLEXNAME]; /* Name of associated plex. */
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struct gv_drive *drive_sc; /* Pointer to underlying drive. */
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struct gv_plex *plex_sc; /* Pointer to associated plex. */
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struct g_provider *provider; /* The provider this sd represents. */
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struct g_consumer *consumer; /* Consumer attached to our provider. */
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LIST_ENTRY(gv_sd) from_drive; /* Subdisk list of underlying drive. */
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LIST_ENTRY(gv_sd) in_plex; /* Subdisk list of associated plex. */
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LIST_ENTRY(gv_sd) sd; /* Entry in the vinum config. */
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struct gv_softc *vinumconf; /* Pointer to the vinum config. */
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};
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/* softc for a plex. */
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struct gv_plex {
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char name[GV_MAXPLEXNAME]; /* The name of the plex. */
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off_t size; /* The size of the plex. */
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int state; /* The plex state. */
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#define GV_PLEX_DOWN 0
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#define GV_PLEX_INITIALIZING 1
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#define GV_PLEX_DEGRADED 2
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#define GV_PLEX_UP 3
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int org; /* The plex organisation. */
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#define GV_PLEX_DISORG 0
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#define GV_PLEX_CONCAT 1
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#define GV_PLEX_STRIPED 2
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#define GV_PLEX_RAID5 4
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int stripesize; /* The stripe size of the plex. */
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char volume[GV_MAXVOLNAME]; /* Name of associated volume. */
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struct gv_volume *vol_sc; /* Pointer to associated volume. */
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int sdcount; /* Number of subdisks in this plex. */
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int sddown; /* Number of subdisks that are down. */
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int flags;
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#define GV_PLEX_ADDED 0x01 /* Added to an existing volume. */
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#define GV_PLEX_SYNCING 0x02 /* Plex is syncing from another plex. */
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#define GV_PLEX_THREAD_ACTIVE 0x04 /* Plex has an active RAID5 thread. */
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#define GV_PLEX_THREAD_DIE 0x08 /* Signal the RAID5 thread to die. */
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#define GV_PLEX_THREAD_DEAD 0x10 /* The RAID5 thread has died. */
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#define GV_PLEX_NEWBORN 0x20 /* The plex was just created. */
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off_t synced; /* Count of synced bytes. */
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struct mtx worklist_mtx; /* Mutex for RAID5 worklist. */
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TAILQ_HEAD(,gv_raid5_packet) worklist; /* List of RAID5 work packets. */
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LIST_HEAD(,gv_sd) subdisks; /* List of attached subdisks. */
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LIST_ENTRY(gv_plex) in_volume; /* Plex list of associated volume. */
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LIST_ENTRY(gv_plex) plex; /* Entry in the vinum config. */
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struct g_provider *provider; /* The provider this plex represents. */
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struct g_consumer *consumer; /* Consumer attached to our provider. */
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struct g_geom *geom; /* The geom of this plex. */
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struct gv_softc *vinumconf; /* Pointer to the vinum config. */
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};
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/* softc for a volume. */
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struct gv_volume {
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char name[GV_MAXVOLNAME]; /* The name of the volume. */
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off_t size; /* The size of the volume. */
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int plexcount; /* Number of plexes. */
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int state; /* The state of the volume. */
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#define GV_VOL_DOWN 0
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#define GV_VOL_UP 1
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LIST_HEAD(,gv_plex) plexes; /* List of attached plexes. */
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LIST_ENTRY(gv_volume) volume; /* Entry in vinum config. */
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struct g_geom *geom; /* The geom of this volume. */
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struct gv_softc *vinumconf; /* Pointer to the vinum config. */
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};
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#endif /* !_GEOM_VINUM_VAR_H */
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