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freebsd-dev/sys/geom/raid/g_raid.h
Conrad Meyer 6b6e2954dd List-ify kernel dump device configuration 
Allow users to specify multiple dump configurations in a prioritized list.
This enables fallback to secondary device(s) if primary dump fails.  E.g.,
one might configure a preference for netdump, but fallback to disk dump as a
second choice if netdump is unavailable.

This change does not list-ify netdump configuration, which is tracked
separately from ordinary disk dumps internally; only one netdump
configuration can be made at a time, for now.  It also does not implement
IPv6 netdump.

savecore(8) is already capable of scanning and iterating multiple devices
from /etc/fstab or passed on the command line.

This change doesn't update the rc or loader variables 'dumpdev' in any way;
it can still be set to configure a single dump device, and rc.d/savecore
still uses it as a single device.  Only dumpon(8) is updated to be able to
configure the more complicated configurations for now.

As part of revving the ABI, unify netdump and disk dump configuration ioctl
/ structure, and leave room for ipv6 netdump as a future possibility.
Backwards-compatibility ioctls are added to smooth ABI transition,
especially for developers who may not keep kernel and userspace perfectly
synced.

Reviewed by:	markj, scottl (earlier version)
Relnotes:	maybe
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D19996
2019-05-06 18:24:07 +00:00

472 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS 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 _G_RAID_H_
#define _G_RAID_H_
#include <sys/param.h>
#include <sys/kobj.h>
#include <sys/bio.h>
#include <sys/time.h>
#ifdef _KERNEL
#include <sys/sysctl.h>
#endif
#define G_RAID_CLASS_NAME "RAID"
#define G_RAID_MAGIC "GEOM::RAID"
#define G_RAID_VERSION 0
struct g_raid_md_object;
struct g_raid_tr_object;
#define G_RAID_DEVICE_FLAG_NOAUTOSYNC 0x0000000000000001ULL
#define G_RAID_DEVICE_FLAG_NOFAILSYNC 0x0000000000000002ULL
#define G_RAID_DEVICE_FLAG_MASK (G_RAID_DEVICE_FLAG_NOAUTOSYNC | \
G_RAID_DEVICE_FLAG_NOFAILSYNC)
#ifdef _KERNEL
extern u_int g_raid_aggressive_spare;
extern u_int g_raid_debug;
extern int g_raid_enable;
extern int g_raid_read_err_thresh;
extern u_int g_raid_start_timeout;
extern struct g_class g_raid_class;
#define G_RAID_DEBUG(lvl, fmt, ...) do { \
if (g_raid_debug >= (lvl)) { \
if (g_raid_debug > 0) { \
printf("GEOM_RAID[%u]: " fmt "\n", \
lvl, ## __VA_ARGS__); \
} else { \
printf("GEOM_RAID: " fmt "\n", \
## __VA_ARGS__); \
} \
} \
} while (0)
#define G_RAID_DEBUG1(lvl, sc, fmt, ...) do { \
if (g_raid_debug >= (lvl)) { \
if (g_raid_debug > 0) { \
printf("GEOM_RAID[%u]: %s: " fmt "\n", \
lvl, (sc)->sc_name, ## __VA_ARGS__); \
} else { \
printf("GEOM_RAID: %s: " fmt "\n", \
(sc)->sc_name, ## __VA_ARGS__); \
} \
} \
} while (0)
#define G_RAID_LOGREQ(lvl, bp, fmt, ...) do { \
if (g_raid_debug >= (lvl)) { \
if (g_raid_debug > 0) { \
printf("GEOM_RAID[%u]: " fmt " ", \
lvl, ## __VA_ARGS__); \
} else \
printf("GEOM_RAID: " fmt " ", ## __VA_ARGS__); \
g_print_bio(bp); \
printf("\n"); \
} \
} while (0)
/*
* Flags we use to distinguish I/O initiated by the TR layer to maintain
* the volume's characteristics, fix subdisks, extra copies of data, etc.
*
* G_RAID_BIO_FLAG_SYNC I/O to update an extra copy of the data
* for RAID volumes that maintain extra data
* and need to rebuild that data.
* G_RAID_BIO_FLAG_REMAP I/O done to try to provoke a subdisk into
* doing some desirable action such as bad
* block remapping after we detect a bad part
* of the disk.
* G_RAID_BIO_FLAG_LOCKED I/O holds range lock that should re released.
*
* and the following meta item:
* G_RAID_BIO_FLAG_SPECIAL And of the I/O flags that need to make it
* through the range locking which would
* otherwise defer the I/O until after that
* range is unlocked.
*/
#define G_RAID_BIO_FLAG_SYNC 0x01
#define G_RAID_BIO_FLAG_REMAP 0x02
#define G_RAID_BIO_FLAG_SPECIAL \
(G_RAID_BIO_FLAG_SYNC|G_RAID_BIO_FLAG_REMAP)
#define G_RAID_BIO_FLAG_LOCKED 0x80
struct g_raid_lock {
off_t l_offset;
off_t l_length;
void *l_callback_arg;
int l_pending;
LIST_ENTRY(g_raid_lock) l_next;
};
#define G_RAID_EVENT_WAIT 0x01
#define G_RAID_EVENT_VOLUME 0x02
#define G_RAID_EVENT_SUBDISK 0x04
#define G_RAID_EVENT_DISK 0x08
#define G_RAID_EVENT_DONE 0x10
struct g_raid_event {
void *e_tgt;
int e_event;
int e_flags;
int e_error;
TAILQ_ENTRY(g_raid_event) e_next;
};
#define G_RAID_DISK_S_NONE 0x00 /* State is unknown. */
#define G_RAID_DISK_S_OFFLINE 0x01 /* Missing disk placeholder. */
#define G_RAID_DISK_S_DISABLED 0x02 /* Disabled. */
#define G_RAID_DISK_S_FAILED 0x03 /* Failed. */
#define G_RAID_DISK_S_STALE_FAILED 0x04 /* Old failed. */
#define G_RAID_DISK_S_SPARE 0x05 /* Hot-spare. */
#define G_RAID_DISK_S_STALE 0x06 /* Old disk, unused now. */
#define G_RAID_DISK_S_ACTIVE 0x07 /* Operational. */
#define G_RAID_DISK_E_DISCONNECTED 0x01
struct g_raid_disk {
struct g_raid_softc *d_softc; /* Back-pointer to softc. */
struct g_consumer *d_consumer; /* GEOM disk consumer. */
void *d_md_data; /* Disk's metadata storage. */
int d_candelete; /* BIO_DELETE supported. */
uint64_t d_flags; /* Additional flags. */
u_int d_state; /* Disk state. */
u_int d_load; /* Disk average load. */
off_t d_last_offset; /* Last head offset. */
int d_read_errs; /* Count of the read errors */
TAILQ_HEAD(, g_raid_subdisk) d_subdisks; /* List of subdisks. */
TAILQ_ENTRY(g_raid_disk) d_next; /* Next disk in the node. */
struct g_kerneldump d_kd; /* Kernel dumping method/args. */
};
#define G_RAID_SUBDISK_S_NONE 0x00 /* Absent. */
#define G_RAID_SUBDISK_S_FAILED 0x01 /* Failed. */
#define G_RAID_SUBDISK_S_NEW 0x02 /* Blank. */
#define G_RAID_SUBDISK_S_REBUILD 0x03 /* Blank + rebuild. */
#define G_RAID_SUBDISK_S_UNINITIALIZED 0x04 /* Disk of the new volume. */
#define G_RAID_SUBDISK_S_STALE 0x05 /* Dirty. */
#define G_RAID_SUBDISK_S_RESYNC 0x06 /* Dirty + check/repair. */
#define G_RAID_SUBDISK_S_ACTIVE 0x07 /* Usable. */
#define G_RAID_SUBDISK_E_NEW 0x01 /* A new subdisk has arrived */
#define G_RAID_SUBDISK_E_FAILED 0x02 /* A subdisk failed, but remains in volume */
#define G_RAID_SUBDISK_E_DISCONNECTED 0x03 /* A subdisk removed from volume. */
#define G_RAID_SUBDISK_E_FIRST_TR_PRIVATE 0x80 /* translation private events */
#define G_RAID_SUBDISK_POS(sd) \
((sd)->sd_disk ? ((sd)->sd_disk->d_last_offset - (sd)->sd_offset) : 0)
#define G_RAID_SUBDISK_TRACK_SIZE (1 * 1024 * 1024)
#define G_RAID_SUBDISK_LOAD(sd) \
((sd)->sd_disk ? ((sd)->sd_disk->d_load) : 0)
#define G_RAID_SUBDISK_LOAD_SCALE 256
struct g_raid_subdisk {
struct g_raid_softc *sd_softc; /* Back-pointer to softc. */
struct g_raid_disk *sd_disk; /* Where this subdisk lives. */
struct g_raid_volume *sd_volume; /* Volume, sd is a part of. */
off_t sd_offset; /* Offset on the disk. */
off_t sd_size; /* Size on the disk. */
u_int sd_pos; /* Position in volume. */
u_int sd_state; /* Subdisk state. */
off_t sd_rebuild_pos; /* Rebuild position. */
int sd_recovery; /* Count of recovery reqs. */
TAILQ_ENTRY(g_raid_subdisk) sd_next; /* Next subdisk on disk. */
};
#define G_RAID_MAX_SUBDISKS 16
#define G_RAID_MAX_VOLUMENAME 32
#define G_RAID_VOLUME_S_STARTING 0x00
#define G_RAID_VOLUME_S_BROKEN 0x01
#define G_RAID_VOLUME_S_DEGRADED 0x02
#define G_RAID_VOLUME_S_SUBOPTIMAL 0x03
#define G_RAID_VOLUME_S_OPTIMAL 0x04
#define G_RAID_VOLUME_S_UNSUPPORTED 0x05
#define G_RAID_VOLUME_S_STOPPED 0x06
#define G_RAID_VOLUME_S_ALIVE(s) \
((s) == G_RAID_VOLUME_S_DEGRADED || \
(s) == G_RAID_VOLUME_S_SUBOPTIMAL || \
(s) == G_RAID_VOLUME_S_OPTIMAL)
#define G_RAID_VOLUME_E_DOWN 0x00
#define G_RAID_VOLUME_E_UP 0x01
#define G_RAID_VOLUME_E_START 0x10
#define G_RAID_VOLUME_E_STARTMD 0x11
#define G_RAID_VOLUME_RL_RAID0 0x00
#define G_RAID_VOLUME_RL_RAID1 0x01
#define G_RAID_VOLUME_RL_RAID3 0x03
#define G_RAID_VOLUME_RL_RAID4 0x04
#define G_RAID_VOLUME_RL_RAID5 0x05
#define G_RAID_VOLUME_RL_RAID6 0x06
#define G_RAID_VOLUME_RL_RAIDMDF 0x07
#define G_RAID_VOLUME_RL_RAID1E 0x11
#define G_RAID_VOLUME_RL_SINGLE 0x0f
#define G_RAID_VOLUME_RL_CONCAT 0x1f
#define G_RAID_VOLUME_RL_RAID5E 0x15
#define G_RAID_VOLUME_RL_RAID5EE 0x25
#define G_RAID_VOLUME_RL_RAID5R 0x35
#define G_RAID_VOLUME_RL_UNKNOWN 0xff
#define G_RAID_VOLUME_RLQ_NONE 0x00
#define G_RAID_VOLUME_RLQ_R1SM 0x00
#define G_RAID_VOLUME_RLQ_R1MM 0x01
#define G_RAID_VOLUME_RLQ_R3P0 0x00
#define G_RAID_VOLUME_RLQ_R3PN 0x01
#define G_RAID_VOLUME_RLQ_R4P0 0x00
#define G_RAID_VOLUME_RLQ_R4PN 0x01
#define G_RAID_VOLUME_RLQ_R5RA 0x00
#define G_RAID_VOLUME_RLQ_R5RS 0x01
#define G_RAID_VOLUME_RLQ_R5LA 0x02
#define G_RAID_VOLUME_RLQ_R5LS 0x03
#define G_RAID_VOLUME_RLQ_R6RA 0x00
#define G_RAID_VOLUME_RLQ_R6RS 0x01
#define G_RAID_VOLUME_RLQ_R6LA 0x02
#define G_RAID_VOLUME_RLQ_R6LS 0x03
#define G_RAID_VOLUME_RLQ_RMDFRA 0x00
#define G_RAID_VOLUME_RLQ_RMDFRS 0x01
#define G_RAID_VOLUME_RLQ_RMDFLA 0x02
#define G_RAID_VOLUME_RLQ_RMDFLS 0x03
#define G_RAID_VOLUME_RLQ_R1EA 0x00
#define G_RAID_VOLUME_RLQ_R1EO 0x01
#define G_RAID_VOLUME_RLQ_R5ERA 0x00
#define G_RAID_VOLUME_RLQ_R5ERS 0x01
#define G_RAID_VOLUME_RLQ_R5ELA 0x02
#define G_RAID_VOLUME_RLQ_R5ELS 0x03
#define G_RAID_VOLUME_RLQ_R5EERA 0x00
#define G_RAID_VOLUME_RLQ_R5EERS 0x01
#define G_RAID_VOLUME_RLQ_R5EELA 0x02
#define G_RAID_VOLUME_RLQ_R5EELS 0x03
#define G_RAID_VOLUME_RLQ_R5RRA 0x00
#define G_RAID_VOLUME_RLQ_R5RRS 0x01
#define G_RAID_VOLUME_RLQ_R5RLA 0x02
#define G_RAID_VOLUME_RLQ_R5RLS 0x03
#define G_RAID_VOLUME_RLQ_UNKNOWN 0xff
struct g_raid_volume;
struct g_raid_volume {
struct g_raid_softc *v_softc; /* Back-pointer to softc. */
struct g_provider *v_provider; /* GEOM provider. */
struct g_raid_subdisk v_subdisks[G_RAID_MAX_SUBDISKS];
/* Subdisks of this volume. */
void *v_md_data; /* Volume's metadata storage. */
struct g_raid_tr_object *v_tr; /* Transformation object. */
char v_name[G_RAID_MAX_VOLUMENAME];
/* Volume name. */
u_int v_state; /* Volume state. */
u_int v_raid_level; /* Array RAID level. */
u_int v_raid_level_qualifier; /* RAID level det. */
u_int v_disks_count; /* Number of disks in array. */
u_int v_mdf_pdisks; /* Number of parity disks
in RAIDMDF array. */
uint16_t v_mdf_polynomial; /* Polynomial for RAIDMDF. */
uint8_t v_mdf_method; /* Generation method for RAIDMDF. */
u_int v_strip_size; /* Array strip size. */
u_int v_rotate_parity; /* Rotate RAID5R parity
after numer of stripes. */
u_int v_sectorsize; /* Volume sector size. */
off_t v_mediasize; /* Volume media size. */
struct bio_queue_head v_inflight; /* In-flight write requests. */
struct bio_queue_head v_locked; /* Blocked I/O requests. */
LIST_HEAD(, g_raid_lock) v_locks; /* List of locked regions. */
int v_pending_lock; /* writes to locked region */
int v_dirty; /* Volume is DIRTY. */
struct timeval v_last_done; /* Time of the last I/O. */
time_t v_last_write; /* Time of the last write. */
u_int v_writes; /* Number of active writes. */
struct root_hold_token *v_rootmount; /* Root mount delay token. */
int v_starting; /* Volume is starting */
int v_stopping; /* Volume is stopping */
int v_provider_open; /* Number of opens. */
int v_global_id; /* Global volume ID (rX). */
int v_read_only; /* Volume is read-only. */
TAILQ_ENTRY(g_raid_volume) v_next; /* List of volumes entry. */
LIST_ENTRY(g_raid_volume) v_global_next; /* Global list entry. */
};
#define G_RAID_NODE_E_WAKE 0x00
#define G_RAID_NODE_E_START 0x01
struct g_raid_softc {
struct g_raid_md_object *sc_md; /* Metadata object. */
struct g_geom *sc_geom; /* GEOM class instance. */
uint64_t sc_flags; /* Additional flags. */
TAILQ_HEAD(, g_raid_volume) sc_volumes; /* List of volumes. */
TAILQ_HEAD(, g_raid_disk) sc_disks; /* List of disks. */
struct sx sc_lock; /* Main node lock. */
struct proc *sc_worker; /* Worker process. */
struct mtx sc_queue_mtx; /* Worker queues lock. */
TAILQ_HEAD(, g_raid_event) sc_events; /* Worker events queue. */
struct bio_queue_head sc_queue; /* Worker I/O queue. */
int sc_stopping; /* Node is stopping */
};
#define sc_name sc_geom->name
SYSCTL_DECL(_kern_geom_raid);
/*
* KOBJ parent class of metadata processing modules.
*/
struct g_raid_md_class {
KOBJ_CLASS_FIELDS;
int mdc_enable;
int mdc_priority;
LIST_ENTRY(g_raid_md_class) mdc_list;
};
/*
* KOBJ instance of metadata processing module.
*/
struct g_raid_md_object {
KOBJ_FIELDS;
struct g_raid_md_class *mdo_class;
struct g_raid_softc *mdo_softc; /* Back-pointer to softc. */
};
int g_raid_md_modevent(module_t, int, void *);
#define G_RAID_MD_DECLARE(name, label) \
static moduledata_t g_raid_md_##name##_mod = { \
"g_raid_md_" __XSTRING(name), \
g_raid_md_modevent, \
&g_raid_md_##name##_class \
}; \
DECLARE_MODULE(g_raid_md_##name, g_raid_md_##name##_mod, \
SI_SUB_DRIVERS, SI_ORDER_SECOND); \
MODULE_DEPEND(g_raid_md_##name, geom_raid, 0, 0, 0); \
SYSCTL_NODE(_kern_geom_raid, OID_AUTO, name, CTLFLAG_RD, \
NULL, label " metadata module"); \
SYSCTL_INT(_kern_geom_raid_##name, OID_AUTO, enable, \
CTLFLAG_RWTUN, &g_raid_md_##name##_class.mdc_enable, 0, \
"Enable " label " metadata format taste")
/*
* KOBJ parent class of data transformation modules.
*/
struct g_raid_tr_class {
KOBJ_CLASS_FIELDS;
int trc_enable;
int trc_priority;
int trc_accept_unmapped;
LIST_ENTRY(g_raid_tr_class) trc_list;
};
/*
* KOBJ instance of data transformation module.
*/
struct g_raid_tr_object {
KOBJ_FIELDS;
struct g_raid_tr_class *tro_class;
struct g_raid_volume *tro_volume; /* Back-pointer to volume. */
};
int g_raid_tr_modevent(module_t, int, void *);
#define G_RAID_TR_DECLARE(name, label) \
static moduledata_t g_raid_tr_##name##_mod = { \
"g_raid_tr_" __XSTRING(name), \
g_raid_tr_modevent, \
&g_raid_tr_##name##_class \
}; \
DECLARE_MODULE(g_raid_tr_##name, g_raid_tr_##name##_mod, \
SI_SUB_DRIVERS, SI_ORDER_FIRST); \
MODULE_DEPEND(g_raid_tr_##name, geom_raid, 0, 0, 0); \
SYSCTL_NODE(_kern_geom_raid, OID_AUTO, name, CTLFLAG_RD, \
NULL, label " transformation module"); \
SYSCTL_INT(_kern_geom_raid_##name, OID_AUTO, enable, \
CTLFLAG_RWTUN, &g_raid_tr_##name##_class.trc_enable, 0, \
"Enable " label " transformation module taste")
const char * g_raid_volume_level2str(int level, int qual);
int g_raid_volume_str2level(const char *str, int *level, int *qual);
const char * g_raid_volume_state2str(int state);
const char * g_raid_subdisk_state2str(int state);
const char * g_raid_disk_state2str(int state);
struct g_raid_softc * g_raid_create_node(struct g_class *mp,
const char *name, struct g_raid_md_object *md);
int g_raid_create_node_format(const char *format, struct gctl_req *req,
struct g_geom **gp);
struct g_raid_volume * g_raid_create_volume(struct g_raid_softc *sc,
const char *name, int id);
struct g_raid_disk * g_raid_create_disk(struct g_raid_softc *sc);
const char * g_raid_get_diskname(struct g_raid_disk *disk);
void g_raid_get_disk_info(struct g_raid_disk *disk);
int g_raid_start_volume(struct g_raid_volume *vol);
int g_raid_destroy_node(struct g_raid_softc *sc, int worker);
int g_raid_destroy_volume(struct g_raid_volume *vol);
int g_raid_destroy_disk(struct g_raid_disk *disk);
void g_raid_iodone(struct bio *bp, int error);
void g_raid_subdisk_iostart(struct g_raid_subdisk *sd, struct bio *bp);
int g_raid_subdisk_kerneldump(struct g_raid_subdisk *sd,
void *virtual, vm_offset_t physical, off_t offset, size_t length);
struct g_consumer *g_raid_open_consumer(struct g_raid_softc *sc,
const char *name);
void g_raid_kill_consumer(struct g_raid_softc *sc, struct g_consumer *cp);
void g_raid_report_disk_state(struct g_raid_disk *disk);
void g_raid_change_disk_state(struct g_raid_disk *disk, int state);
void g_raid_change_subdisk_state(struct g_raid_subdisk *sd, int state);
void g_raid_change_volume_state(struct g_raid_volume *vol, int state);
void g_raid_write_metadata(struct g_raid_softc *sc, struct g_raid_volume *vol,
struct g_raid_subdisk *sd, struct g_raid_disk *disk);
void g_raid_fail_disk(struct g_raid_softc *sc,
struct g_raid_subdisk *sd, struct g_raid_disk *disk);
void g_raid_tr_flush_common(struct g_raid_tr_object *tr, struct bio *bp);
int g_raid_tr_kerneldump_common(struct g_raid_tr_object *tr,
void *virtual, vm_offset_t physical, off_t offset, size_t length);
u_int g_raid_ndisks(struct g_raid_softc *sc, int state);
u_int g_raid_nsubdisks(struct g_raid_volume *vol, int state);
u_int g_raid_nopens(struct g_raid_softc *sc);
struct g_raid_subdisk * g_raid_get_subdisk(struct g_raid_volume *vol,
int state);
#define G_RAID_DESTROY_SOFT 0
#define G_RAID_DESTROY_DELAYED 1
#define G_RAID_DESTROY_HARD 2
int g_raid_destroy(struct g_raid_softc *sc, int how);
int g_raid_event_send(void *arg, int event, int flags);
int g_raid_lock_range(struct g_raid_volume *vol, off_t off, off_t len,
struct bio *ignore, void *argp);
int g_raid_unlock_range(struct g_raid_volume *vol, off_t off, off_t len);
g_ctl_req_t g_raid_ctl;
#endif /* _KERNEL */
#endif /* !_G_RAID_H_ */
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