freebsd-dev/sys/geom/vinum/geom_vinum_var.h
Lukas Ertl d8688e1117 Correctly calculate what to do and how to retry a request to a plex when
the previous one failed and there are more than one plex in the volume.

This could have led to a flood of error messages on the console and
probably a deadlock in certain situations.
2005-02-23 14:59:14 +00:00

319 lines
11 KiB
C

/*-
* Copyright (c) 2004 Lukas Ertl
* Copyright (c) 1997, 1998, 1999
* Nan Yang Computer Services Limited. All rights reserved.
*
* Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
* Parts written by Greg Lehey.
*
* This software is distributed under the so-called ``Berkeley
* License'': *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Nan Yang Computer
* Services Limited.
* 4. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided ``as is'', and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed.
* In no event shall the company or contributors be liable for any * direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even if
* advised of the possibility of such damage.
*
* $FreeBSD$
*/
#ifndef _GEOM_VINUM_VAR_H_
#define _GEOM_VINUM_VAR_H_
/*
* Slice header
*
* Vinum drives start with this structure:
*
*\ Sector
* |--------------------------------------|
* | PDP-11 memorial boot block | 0
* |--------------------------------------|
* | Disk label, maybe | 1
* |--------------------------------------|
* | Slice definition (vinum_hdr) | 8
* |--------------------------------------|
* | |
* | Configuration info, first copy | 9
* | |
* |--------------------------------------|
* | |
* | Configuration info, second copy | 9 + size of config
* | |
* |--------------------------------------|
*/
/* Sizes and offsets of our information. */
#define GV_HDR_OFFSET 4096 /* Offset of vinum header. */
#define GV_HDR_LEN 512 /* Size of vinum header. */
#define GV_CFG_OFFSET 4608 /* Offset of first config copy. */
#define GV_CFG_LEN 65536 /* Size of config copy. */
/* This is where the actual data starts. */
#define GV_DATA_START (GV_CFG_LEN * 2 + GV_CFG_OFFSET)
/* #define GV_DATA_START (GV_CFG_LEN * 2 + GV_HDR_LEN) */
#define GV_MAXDRIVENAME 32 /* Maximum length of a device name. */
#define GV_MAXSDNAME 64 /* Maximum length of a subdisk name. */
#define GV_MAXPLEXNAME 64 /* Maximum length of a plex name. */
#define GV_MAXVOLNAME 64 /* Maximum length of a volume name. */
/* Command line flags. */
#define GV_FLAG_R 0x01
#define GV_FLAG_S 0x02
#define GV_FLAG_V 0x04
#define GV_FLAG_VV 0x08
#define GV_FLAG_F 0x10
/* Object types. */
#define GV_TYPE_VOL 1
#define GV_TYPE_PLEX 2
#define GV_TYPE_SD 3
#define GV_TYPE_DRIVE 4
/* State changing flags. */
#define GV_SETSTATE_FORCE 0x1
#define GV_SETSTATE_CONFIG 0x2
/* Subdisk state bitmaps for plexes. */
#define GV_SD_DOWNSTATE 0x01 /* Subdisk is down. */
#define GV_SD_STALESTATE 0x02 /* Subdisk is stale. */
#define GV_SD_INITSTATE 0x04 /* Subdisk is initializing. */
#define GV_SD_UPSTATE 0x08 /* Subdisk is up. */
/* Synchronization/initialization request sizes. */
#define GV_MIN_SYNCSIZE 512
#define GV_MAX_SYNCSIZE MAXPHYS
#define GV_DFLT_SYNCSIZE 65536
/* Flags for BIOs, as they are processed within vinum. */
#define GV_BIO_DONE 0x01
#define GV_BIO_MALLOC 0x02
#define GV_BIO_ONHOLD 0x04
#define GV_BIO_SYNCREQ 0x08
#define GV_BIO_SUCCEED 0x10
#define GV_BIO_REBUILD 0x20
#define GV_BIO_CHECK 0x40
#define GV_BIO_PARITY 0x80
#define GV_BIO_RETRY 0x100
/*
* hostname is 256 bytes long, but we don't need to shlep multiple copies in
* vinum. We use the host name just to identify this system, and 32 bytes
* should be ample for that purpose.
*/
#define GV_HOSTNAME_LEN 32
struct gv_label {
char sysname[GV_HOSTNAME_LEN]; /* System name at creation time. */
char name[GV_MAXDRIVENAME]; /* Our name of the drive. */
struct timeval date_of_birth; /* The time it was created ... */
struct timeval last_update; /* ... and the time of last update. */
off_t drive_size; /* Total size incl. headers. */
};
/* The 'header' of each valid vinum drive. */
struct gv_hdr {
uint64_t magic;
#define GV_MAGIC 22322600044678729LL
#define GV_NOMAGIC 22322600044678990LL
int config_length;
struct gv_label label;
};
/* A single freelist entry of a drive. */
struct gv_freelist {
off_t size; /* Size of this free slot. */
off_t offset; /* Offset on the drive. */
LIST_ENTRY(gv_freelist) freelist;
};
/*
* Since we share structures between userland and kernel, we need this helper
* struct instead of struct bio_queue_head and friends. Maybe I find a proper
* solution some day.
*/
struct gv_bioq {
struct bio *bp;
TAILQ_ENTRY(gv_bioq) queue;
};
/* This struct contains the main vinum config. */
struct gv_softc {
/*struct mtx config_mtx; XXX not yet */
/* Linked lists of all objects in our setup. */
LIST_HEAD(,gv_drive) drives; /* All drives. */
LIST_HEAD(,gv_plex) plexes; /* All plexes. */
LIST_HEAD(,gv_sd) subdisks; /* All subdisks. */
LIST_HEAD(,gv_volume) volumes; /* All volumes. */
struct g_geom *geom; /* Pointer to our VINUM geom. */
};
/* softc for a drive. */
struct gv_drive {
char name[GV_MAXDRIVENAME]; /* The name of this drive. */
char device[GV_MAXDRIVENAME]; /* Associated device. */
int state; /* The state of this drive. */
#define GV_DRIVE_DOWN 0
#define GV_DRIVE_UP 1
off_t size; /* Size of this drive. */
off_t avail; /* Available space. */
int sdcount; /* Number of subdisks. */
int flags;
#define GV_DRIVE_THREAD_ACTIVE 0x01 /* Drive has an active worker thread. */
#define GV_DRIVE_THREAD_DIE 0x02 /* Signal the worker thread to die. */
#define GV_DRIVE_THREAD_DEAD 0x04 /* The worker thread has died. */
struct gv_hdr *hdr; /* The drive header. */
int freelist_entries; /* Count of freelist entries. */
LIST_HEAD(,gv_freelist) freelist; /* List of freelist entries. */
LIST_HEAD(,gv_sd) subdisks; /* Subdisks on this drive. */
LIST_ENTRY(gv_drive) drive; /* Entry in the vinum config. */
TAILQ_HEAD(,gv_bioq) bqueue; /* BIO queue of this drive. */
struct mtx bqueue_mtx; /* Mtx. to protect the queue. */
struct g_geom *geom; /* The geom of this drive. */
struct gv_softc *vinumconf; /* Pointer to the vinum conf. */
};
/* softc for a subdisk. */
struct gv_sd {
char name[GV_MAXSDNAME]; /* The name of this subdisk. */
off_t size; /* The size of this subdisk. */
off_t drive_offset; /* Offset in the underlying drive. */
off_t plex_offset; /* Offset in the associated plex. */
int state; /* The state of this subdisk. */
#define GV_SD_DOWN 0
#define GV_SD_STALE 1
#define GV_SD_INITIALIZING 2
#define GV_SD_REVIVING 3
#define GV_SD_UP 4
off_t initialized; /* Count of initialized bytes. */
int init_size; /* Initialization read/write size. */
int init_error; /* Flag error on initialization. */
int flags;
#define GV_SD_NEWBORN 0x01 /* Subdisk was just created. */
#define GV_SD_INITCANCEL 0x02 /* Cancel initialization process. */
char drive[GV_MAXDRIVENAME]; /* Name of underlying drive. */
char plex[GV_MAXPLEXNAME]; /* Name of associated plex. */
struct gv_drive *drive_sc; /* Pointer to underlying drive. */
struct gv_plex *plex_sc; /* Pointer to associated plex. */
struct g_provider *provider; /* The provider this sd represents. */
struct g_consumer *consumer; /* Consumer attached to our provider. */
LIST_ENTRY(gv_sd) from_drive; /* Subdisk list of underlying drive. */
LIST_ENTRY(gv_sd) in_plex; /* Subdisk list of associated plex. */
LIST_ENTRY(gv_sd) sd; /* Entry in the vinum config. */
struct gv_softc *vinumconf; /* Pointer to the vinum config. */
};
/* softc for a plex. */
struct gv_plex {
char name[GV_MAXPLEXNAME]; /* The name of the plex. */
off_t size; /* The size of the plex. */
int state; /* The plex state. */
#define GV_PLEX_DOWN 0
#define GV_PLEX_INITIALIZING 1
#define GV_PLEX_DEGRADED 2
#define GV_PLEX_UP 3
int org; /* The plex organisation. */
#define GV_PLEX_DISORG 0
#define GV_PLEX_CONCAT 1
#define GV_PLEX_STRIPED 2
#define GV_PLEX_RAID5 4
int stripesize; /* The stripe size of the plex. */
char volume[GV_MAXVOLNAME]; /* Name of associated volume. */
struct gv_volume *vol_sc; /* Pointer to associated volume. */
int sdcount; /* Number of subdisks in this plex. */
int sddown; /* Number of subdisks that are down. */
int flags;
#define GV_PLEX_ADDED 0x01 /* Added to an existing volume. */
#define GV_PLEX_SYNCING 0x02 /* Plex is syncing from another plex. */
#define GV_PLEX_THREAD_ACTIVE 0x04 /* Plex has an active RAID5 thread. */
#define GV_PLEX_THREAD_DIE 0x08 /* Signal the RAID5 thread to die. */
#define GV_PLEX_THREAD_DEAD 0x10 /* The RAID5 thread has died. */
#define GV_PLEX_NEWBORN 0x20 /* The plex was just created. */
off_t synced; /* Count of synced bytes. */
struct mtx bqueue_mtx; /* Lock for the BIO queue. */
TAILQ_HEAD(,gv_bioq) bqueue; /* BIO queue. */
TAILQ_HEAD(,gv_bioq) wqueue; /* Waiting BIO queue. */
TAILQ_HEAD(,gv_raid5_packet) packets; /* RAID5 sub-requests. */
LIST_HEAD(,gv_sd) subdisks; /* List of attached subdisks. */
LIST_ENTRY(gv_plex) in_volume; /* Plex list of associated volume. */
LIST_ENTRY(gv_plex) plex; /* Entry in the vinum config. */
struct g_provider *provider; /* The provider this plex represents. */
struct g_consumer *consumer; /* Consumer attached to our provider. */
struct g_geom *geom; /* The geom of this plex. */
struct gv_softc *vinumconf; /* Pointer to the vinum config. */
};
/* softc for a volume. */
struct gv_volume {
char name[GV_MAXVOLNAME]; /* The name of the volume. */
off_t size; /* The size of the volume. */
int plexcount; /* Number of plexes. */
int state; /* The state of the volume. */
#define GV_VOL_DOWN 0
#define GV_VOL_UP 1
int flags;
#define GV_VOL_THREAD_ACTIVE 0x01 /* Volume has an active thread. */
#define GV_VOL_THREAD_DIE 0x02 /* Signal the thread to die. */
#define GV_VOL_THREAD_DEAD 0x04 /* The thread has died. */
struct mtx bqueue_mtx; /* Lock for the BIO queue. */
TAILQ_HEAD(,gv_bioq) bqueue; /* BIO queue. */
LIST_HEAD(,gv_plex) plexes; /* List of attached plexes. */
LIST_ENTRY(gv_volume) volume; /* Entry in vinum config. */
struct g_geom *geom; /* The geom of this volume. */
struct gv_softc *vinumconf; /* Pointer to the vinum config. */
};
#endif /* !_GEOM_VINUM_VAR_H */