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| Current File : //sys/geom/raid3/g_raid3.h |
/*-
* Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@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: release/9.1.0/sys/geom/raid3/g_raid3.h 200821 2009-12-21 23:31:03Z mav $
*/
#ifndef _G_RAID3_H_
#define _G_RAID3_H_
#include <sys/endian.h>
#include <sys/md5.h>
#define G_RAID3_CLASS_NAME "RAID3"
#define G_RAID3_MAGIC "GEOM::RAID3"
/*
* Version history:
* 0 - Initial version number.
* 1 - Added 'round-robin reading' algorithm.
* 2 - Added 'verify reading' algorithm.
* 3 - Added md_genid field to metadata.
* 4 - Added md_provsize field to metadata.
* 5 - Added 'no failure synchronization' flag.
*/
#define G_RAID3_VERSION 5
#define G_RAID3_DISK_FLAG_DIRTY 0x0000000000000001ULL
#define G_RAID3_DISK_FLAG_SYNCHRONIZING 0x0000000000000002ULL
#define G_RAID3_DISK_FLAG_FORCE_SYNC 0x0000000000000004ULL
#define G_RAID3_DISK_FLAG_HARDCODED 0x0000000000000008ULL
#define G_RAID3_DISK_FLAG_BROKEN 0x0000000000000010ULL
#define G_RAID3_DISK_FLAG_MASK (G_RAID3_DISK_FLAG_DIRTY | \
G_RAID3_DISK_FLAG_SYNCHRONIZING | \
G_RAID3_DISK_FLAG_FORCE_SYNC)
#define G_RAID3_DEVICE_FLAG_NOAUTOSYNC 0x0000000000000001ULL
#define G_RAID3_DEVICE_FLAG_ROUND_ROBIN 0x0000000000000002ULL
#define G_RAID3_DEVICE_FLAG_VERIFY 0x0000000000000004ULL
#define G_RAID3_DEVICE_FLAG_NOFAILSYNC 0x0000000000000008ULL
#define G_RAID3_DEVICE_FLAG_MASK (G_RAID3_DEVICE_FLAG_NOAUTOSYNC | \
G_RAID3_DEVICE_FLAG_ROUND_ROBIN | \
G_RAID3_DEVICE_FLAG_VERIFY | \
G_RAID3_DEVICE_FLAG_NOFAILSYNC)
#ifdef _KERNEL
extern u_int g_raid3_debug;
#define G_RAID3_DEBUG(lvl, ...) do { \
if (g_raid3_debug >= (lvl)) { \
printf("GEOM_RAID3"); \
if (g_raid3_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf("\n"); \
} \
} while (0)
#define G_RAID3_LOGREQ(lvl, bp, ...) do { \
if (g_raid3_debug >= (lvl)) { \
printf("GEOM_RAID3"); \
if (g_raid3_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf(" "); \
g_print_bio(bp); \
printf("\n"); \
} \
} while (0)
#define G_RAID3_BIO_CFLAG_REGULAR 0x01
#define G_RAID3_BIO_CFLAG_SYNC 0x02
#define G_RAID3_BIO_CFLAG_PARITY 0x04
#define G_RAID3_BIO_CFLAG_NODISK 0x08
#define G_RAID3_BIO_CFLAG_REGSYNC 0x10
#define G_RAID3_BIO_CFLAG_MASK (G_RAID3_BIO_CFLAG_REGULAR | \
G_RAID3_BIO_CFLAG_SYNC | \
G_RAID3_BIO_CFLAG_PARITY | \
G_RAID3_BIO_CFLAG_NODISK | \
G_RAID3_BIO_CFLAG_REGSYNC)
#define G_RAID3_BIO_PFLAG_DEGRADED 0x01
#define G_RAID3_BIO_PFLAG_NOPARITY 0x02
#define G_RAID3_BIO_PFLAG_VERIFY 0x04
#define G_RAID3_BIO_PFLAG_MASK (G_RAID3_BIO_PFLAG_DEGRADED | \
G_RAID3_BIO_PFLAG_NOPARITY | \
G_RAID3_BIO_PFLAG_VERIFY)
/*
* Informations needed for synchronization.
*/
struct g_raid3_disk_sync {
struct g_consumer *ds_consumer; /* Consumer connected to our device. */
off_t ds_offset; /* Offset of next request to send. */
off_t ds_offset_done; /* Offset of already synchronized
region. */
off_t ds_resync; /* Resynchronize from this offset. */
u_int ds_syncid; /* Disk's synchronization ID. */
u_int ds_inflight; /* Number of in-flight sync requests. */
struct bio **ds_bios; /* BIOs for synchronization I/O. */
};
/*
* Informations needed for synchronization.
*/
struct g_raid3_device_sync {
struct g_geom *ds_geom; /* Synchronization geom. */
};
#define G_RAID3_DISK_STATE_NODISK 0
#define G_RAID3_DISK_STATE_NONE 1
#define G_RAID3_DISK_STATE_NEW 2
#define G_RAID3_DISK_STATE_ACTIVE 3
#define G_RAID3_DISK_STATE_STALE 4
#define G_RAID3_DISK_STATE_SYNCHRONIZING 5
#define G_RAID3_DISK_STATE_DISCONNECTED 6
#define G_RAID3_DISK_STATE_DESTROY 7
struct g_raid3_disk {
u_int d_no; /* Disk number. */
struct g_consumer *d_consumer; /* Consumer. */
struct g_raid3_softc *d_softc; /* Back-pointer to softc. */
int d_state; /* Disk state. */
uint64_t d_flags; /* Additional flags. */
u_int d_genid; /* Disk's generation ID. */
struct g_raid3_disk_sync d_sync; /* Sync information. */
LIST_ENTRY(g_raid3_disk) d_next;
};
#define d_name d_consumer->provider->name
#define G_RAID3_EVENT_DONTWAIT 0x1
#define G_RAID3_EVENT_WAIT 0x2
#define G_RAID3_EVENT_DEVICE 0x4
#define G_RAID3_EVENT_DONE 0x8
struct g_raid3_event {
struct g_raid3_disk *e_disk;
int e_state;
int e_flags;
int e_error;
TAILQ_ENTRY(g_raid3_event) e_next;
};
#define G_RAID3_DEVICE_FLAG_DESTROY 0x0100000000000000ULL
#define G_RAID3_DEVICE_FLAG_WAIT 0x0200000000000000ULL
#define G_RAID3_DEVICE_FLAG_DESTROYING 0x0400000000000000ULL
#define G_RAID3_DEVICE_STATE_STARTING 0
#define G_RAID3_DEVICE_STATE_DEGRADED 1
#define G_RAID3_DEVICE_STATE_COMPLETE 2
/* Bump syncid on first write. */
#define G_RAID3_BUMP_SYNCID 0x1
/* Bump genid immediately. */
#define G_RAID3_BUMP_GENID 0x2
enum g_raid3_zones {
G_RAID3_ZONE_64K,
G_RAID3_ZONE_16K,
G_RAID3_ZONE_4K,
G_RAID3_NUM_ZONES
};
static __inline enum g_raid3_zones
g_raid3_zone(size_t nbytes) {
if (nbytes > 65536)
return (G_RAID3_NUM_ZONES);
else if (nbytes > 16384)
return (G_RAID3_ZONE_64K);
else if (nbytes > 4096)
return (G_RAID3_ZONE_16K);
else
return (G_RAID3_ZONE_4K);
};
struct g_raid3_softc {
u_int sc_state; /* Device state. */
uint64_t sc_mediasize; /* Device size. */
uint32_t sc_sectorsize; /* Sector size. */
uint64_t sc_flags; /* Additional flags. */
struct g_geom *sc_geom;
struct g_provider *sc_provider;
uint32_t sc_id; /* Device unique ID. */
struct sx sc_lock;
struct bio_queue_head sc_queue;
struct mtx sc_queue_mtx;
struct proc *sc_worker;
struct bio_queue_head sc_regular_delayed; /* Delayed I/O requests due
collision with sync
requests. */
struct bio_queue_head sc_inflight; /* In-flight regular write
requests. */
struct bio_queue_head sc_sync_delayed; /* Delayed sync requests due
collision with regular
requests. */
struct g_raid3_disk *sc_disks;
u_int sc_ndisks; /* Number of disks. */
u_int sc_round_robin;
struct g_raid3_disk *sc_syncdisk;
struct g_raid3_zone {
uma_zone_t sz_zone;
size_t sz_inuse;
size_t sz_max;
u_int sz_requested;
u_int sz_failed;
} sc_zones[G_RAID3_NUM_ZONES];
u_int sc_genid; /* Generation ID. */
u_int sc_syncid; /* Synchronization ID. */
int sc_bump_id;
struct g_raid3_device_sync sc_sync;
int sc_idle; /* DIRTY flags removed. */
time_t sc_last_write;
u_int sc_writes;
TAILQ_HEAD(, g_raid3_event) sc_events;
struct mtx sc_events_mtx;
struct callout sc_callout;
struct root_hold_token *sc_rootmount;
};
#define sc_name sc_geom->name
const char *g_raid3_get_diskname(struct g_raid3_disk *disk);
u_int g_raid3_ndisks(struct g_raid3_softc *sc, int state);
#define G_RAID3_DESTROY_SOFT 0
#define G_RAID3_DESTROY_DELAYED 1
#define G_RAID3_DESTROY_HARD 2
int g_raid3_destroy(struct g_raid3_softc *sc, int how);
int g_raid3_event_send(void *arg, int state, int flags);
struct g_raid3_metadata;
int g_raid3_add_disk(struct g_raid3_softc *sc, struct g_provider *pp,
struct g_raid3_metadata *md);
int g_raid3_read_metadata(struct g_consumer *cp, struct g_raid3_metadata *md);
void g_raid3_fill_metadata(struct g_raid3_disk *disk,
struct g_raid3_metadata *md);
int g_raid3_clear_metadata(struct g_raid3_disk *disk);
void g_raid3_update_metadata(struct g_raid3_disk *disk);
g_ctl_req_t g_raid3_config;
#endif /* _KERNEL */
struct g_raid3_metadata {
char md_magic[16]; /* Magic value. */
uint32_t md_version; /* Version number. */
char md_name[16]; /* Device name. */
uint32_t md_id; /* Device unique ID. */
uint16_t md_no; /* Component number. */
uint16_t md_all; /* Number of disks in device. */
uint32_t md_genid; /* Generation ID. */
uint32_t md_syncid; /* Synchronization ID. */
uint64_t md_mediasize; /* Size of whole device. */
uint32_t md_sectorsize; /* Sector size. */
uint64_t md_sync_offset; /* Synchronized offset. */
uint64_t md_mflags; /* Additional device flags. */
uint64_t md_dflags; /* Additional disk flags. */
char md_provider[16]; /* Hardcoded provider. */
uint64_t md_provsize; /* Provider's size. */
u_char md_hash[16]; /* MD5 hash. */
};
static __inline void
raid3_metadata_encode(struct g_raid3_metadata *md, u_char *data)
{
MD5_CTX ctx;
bcopy(md->md_magic, data, 16);
le32enc(data + 16, md->md_version);
bcopy(md->md_name, data + 20, 16);
le32enc(data + 36, md->md_id);
le16enc(data + 40, md->md_no);
le16enc(data + 42, md->md_all);
le32enc(data + 44, md->md_genid);
le32enc(data + 48, md->md_syncid);
le64enc(data + 52, md->md_mediasize);
le32enc(data + 60, md->md_sectorsize);
le64enc(data + 64, md->md_sync_offset);
le64enc(data + 72, md->md_mflags);
le64enc(data + 80, md->md_dflags);
bcopy(md->md_provider, data + 88, 16);
le64enc(data + 104, md->md_provsize);
MD5Init(&ctx);
MD5Update(&ctx, data, 112);
MD5Final(md->md_hash, &ctx);
bcopy(md->md_hash, data + 112, 16);
}
static __inline int
raid3_metadata_decode_v0v1v2(const u_char *data, struct g_raid3_metadata *md)
{
MD5_CTX ctx;
bcopy(data + 20, md->md_name, 16);
md->md_id = le32dec(data + 36);
md->md_no = le16dec(data + 40);
md->md_all = le16dec(data + 42);
md->md_syncid = le32dec(data + 44);
md->md_mediasize = le64dec(data + 48);
md->md_sectorsize = le32dec(data + 56);
md->md_sync_offset = le64dec(data + 60);
md->md_mflags = le64dec(data + 68);
md->md_dflags = le64dec(data + 76);
bcopy(data + 84, md->md_provider, 16);
bcopy(data + 100, md->md_hash, 16);
MD5Init(&ctx);
MD5Update(&ctx, data, 100);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 100, 16) != 0)
return (EINVAL);
/* New fields. */
md->md_genid = 0;
md->md_provsize = 0;
return (0);
}
static __inline int
raid3_metadata_decode_v3(const u_char *data, struct g_raid3_metadata *md)
{
MD5_CTX ctx;
bcopy(data + 20, md->md_name, 16);
md->md_id = le32dec(data + 36);
md->md_no = le16dec(data + 40);
md->md_all = le16dec(data + 42);
md->md_genid = le32dec(data + 44);
md->md_syncid = le32dec(data + 48);
md->md_mediasize = le64dec(data + 52);
md->md_sectorsize = le32dec(data + 60);
md->md_sync_offset = le64dec(data + 64);
md->md_mflags = le64dec(data + 72);
md->md_dflags = le64dec(data + 80);
bcopy(data + 88, md->md_provider, 16);
bcopy(data + 104, md->md_hash, 16);
MD5Init(&ctx);
MD5Update(&ctx, data, 104);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 104, 16) != 0)
return (EINVAL);
/* New fields. */
md->md_provsize = 0;
return (0);
}
static __inline int
raid3_metadata_decode_v4v5(const u_char *data, struct g_raid3_metadata *md)
{
MD5_CTX ctx;
bcopy(data + 20, md->md_name, 16);
md->md_id = le32dec(data + 36);
md->md_no = le16dec(data + 40);
md->md_all = le16dec(data + 42);
md->md_genid = le32dec(data + 44);
md->md_syncid = le32dec(data + 48);
md->md_mediasize = le64dec(data + 52);
md->md_sectorsize = le32dec(data + 60);
md->md_sync_offset = le64dec(data + 64);
md->md_mflags = le64dec(data + 72);
md->md_dflags = le64dec(data + 80);
bcopy(data + 88, md->md_provider, 16);
md->md_provsize = le64dec(data + 104);
bcopy(data + 112, md->md_hash, 16);
MD5Init(&ctx);
MD5Update(&ctx, data, 112);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 112, 16) != 0)
return (EINVAL);
return (0);
}
static __inline int
raid3_metadata_decode(const u_char *data, struct g_raid3_metadata *md)
{
int error;
bcopy(data, md->md_magic, 16);
md->md_version = le32dec(data + 16);
switch (md->md_version) {
case 0:
case 1:
case 2:
error = raid3_metadata_decode_v0v1v2(data, md);
break;
case 3:
error = raid3_metadata_decode_v3(data, md);
break;
case 4:
case 5:
error = raid3_metadata_decode_v4v5(data, md);
break;
default:
error = EINVAL;
break;
}
return (error);
}
static __inline void
raid3_metadata_dump(const struct g_raid3_metadata *md)
{
static const char hex[] = "0123456789abcdef";
char hash[16 * 2 + 1];
u_int i;
printf(" magic: %s\n", md->md_magic);
printf(" version: %u\n", (u_int)md->md_version);
printf(" name: %s\n", md->md_name);
printf(" id: %u\n", (u_int)md->md_id);
printf(" no: %u\n", (u_int)md->md_no);
printf(" all: %u\n", (u_int)md->md_all);
printf(" genid: %u\n", (u_int)md->md_genid);
printf(" syncid: %u\n", (u_int)md->md_syncid);
printf(" mediasize: %jd\n", (intmax_t)md->md_mediasize);
printf("sectorsize: %u\n", (u_int)md->md_sectorsize);
printf("syncoffset: %jd\n", (intmax_t)md->md_sync_offset);
printf(" mflags:");
if (md->md_mflags == 0)
printf(" NONE");
else {
if ((md->md_mflags & G_RAID3_DEVICE_FLAG_NOAUTOSYNC) != 0)
printf(" NOAUTOSYNC");
if ((md->md_mflags & G_RAID3_DEVICE_FLAG_ROUND_ROBIN) != 0)
printf(" ROUND-ROBIN");
if ((md->md_mflags & G_RAID3_DEVICE_FLAG_VERIFY) != 0)
printf(" VERIFY");
if ((md->md_mflags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
printf(" NOFAILSYNC");
}
printf("\n");
printf(" dflags:");
if (md->md_dflags == 0)
printf(" NONE");
else {
if ((md->md_dflags & G_RAID3_DISK_FLAG_DIRTY) != 0)
printf(" DIRTY");
if ((md->md_dflags & G_RAID3_DISK_FLAG_SYNCHRONIZING) != 0)
printf(" SYNCHRONIZING");
if ((md->md_dflags & G_RAID3_DISK_FLAG_FORCE_SYNC) != 0)
printf(" FORCE_SYNC");
}
printf("\n");
printf("hcprovider: %s\n", md->md_provider);
printf(" provsize: %ju\n", (uintmax_t)md->md_provsize);
bzero(hash, sizeof(hash));
for (i = 0; i < 16; i++) {
hash[i * 2] = hex[md->md_hash[i] >> 4];
hash[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
}
printf(" MD5 hash: %s\n", hash);
}
#endif /* !_G_RAID3_H_ */