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| Current File : //sys/geom/mirror/g_mirror.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/mirror/g_mirror.h 238500 2012-07-15 19:52:23Z glebius $
*/
#ifndef _G_MIRROR_H_
#define _G_MIRROR_H_
#include <sys/endian.h>
#include <sys/md5.h>
#define G_MIRROR_CLASS_NAME "MIRROR"
#define G_MIRROR_MAGIC "GEOM::MIRROR"
/*
* Version history:
* 0 - Initial version number.
* 1 - Added 'prefer' balance algorithm.
* 2 - Added md_genid field to metadata.
* 3 - Added md_provsize field to metadata.
* 4 - Added 'no failure synchronization' flag.
*/
#define G_MIRROR_VERSION 4
#define G_MIRROR_BALANCE_NONE 0
#define G_MIRROR_BALANCE_ROUND_ROBIN 1
#define G_MIRROR_BALANCE_LOAD 2
#define G_MIRROR_BALANCE_SPLIT 3
#define G_MIRROR_BALANCE_PREFER 4
#define G_MIRROR_BALANCE_MIN G_MIRROR_BALANCE_NONE
#define G_MIRROR_BALANCE_MAX G_MIRROR_BALANCE_PREFER
#define G_MIRROR_DISK_FLAG_DIRTY 0x0000000000000001ULL
#define G_MIRROR_DISK_FLAG_SYNCHRONIZING 0x0000000000000002ULL
#define G_MIRROR_DISK_FLAG_FORCE_SYNC 0x0000000000000004ULL
#define G_MIRROR_DISK_FLAG_INACTIVE 0x0000000000000008ULL
#define G_MIRROR_DISK_FLAG_HARDCODED 0x0000000000000010ULL
#define G_MIRROR_DISK_FLAG_BROKEN 0x0000000000000020ULL
#define G_MIRROR_DISK_FLAG_CANDELETE 0x0000000000000040ULL
#define G_MIRROR_DISK_FLAG_MASK (G_MIRROR_DISK_FLAG_DIRTY | \
G_MIRROR_DISK_FLAG_SYNCHRONIZING | \
G_MIRROR_DISK_FLAG_FORCE_SYNC | \
G_MIRROR_DISK_FLAG_INACTIVE | \
G_MIRROR_DISK_FLAG_CANDELETE)
#define G_MIRROR_DEVICE_FLAG_NOAUTOSYNC 0x0000000000000001ULL
#define G_MIRROR_DEVICE_FLAG_NOFAILSYNC 0x0000000000000002ULL
#define G_MIRROR_DEVICE_FLAG_MASK (G_MIRROR_DEVICE_FLAG_NOAUTOSYNC | \
G_MIRROR_DEVICE_FLAG_NOFAILSYNC)
#ifdef _KERNEL
extern u_int g_mirror_debug;
#define G_MIRROR_DEBUG(lvl, ...) do { \
if (g_mirror_debug >= (lvl)) { \
printf("GEOM_MIRROR"); \
if (g_mirror_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf("\n"); \
} \
} while (0)
#define G_MIRROR_LOGREQ(lvl, bp, ...) do { \
if (g_mirror_debug >= (lvl)) { \
printf("GEOM_MIRROR"); \
if (g_mirror_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf(" "); \
g_print_bio(bp); \
printf("\n"); \
} \
} while (0)
#define G_MIRROR_BIO_FLAG_REGULAR 0x01
#define G_MIRROR_BIO_FLAG_SYNC 0x02
/*
* Informations needed for synchronization.
*/
struct g_mirror_disk_sync {
struct g_consumer *ds_consumer; /* Consumer connected to our mirror. */
off_t ds_offset; /* Offset of next request to send. */
off_t ds_offset_done; /* Offset of already synchronized
region. */
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_mirror_device_sync {
struct g_geom *ds_geom; /* Synchronization geom. */
u_int ds_ndisks; /* Number of disks in SYNCHRONIZING
state. */
};
#define G_MIRROR_DISK_STATE_NONE 0
#define G_MIRROR_DISK_STATE_NEW 1
#define G_MIRROR_DISK_STATE_ACTIVE 2
#define G_MIRROR_DISK_STATE_STALE 3
#define G_MIRROR_DISK_STATE_SYNCHRONIZING 4
#define G_MIRROR_DISK_STATE_DISCONNECTED 5
#define G_MIRROR_DISK_STATE_DESTROY 6
struct g_mirror_disk {
uint32_t d_id; /* Disk ID. */
struct g_consumer *d_consumer; /* Consumer. */
struct g_mirror_softc *d_softc; /* Back-pointer to softc. */
int d_state; /* Disk state. */
u_int d_priority; /* Disk priority. */
u_int load; /* Averaged queue length */
off_t d_last_offset; /* Last read offset */
uint64_t d_flags; /* Additional flags. */
u_int d_genid; /* Disk's generation ID. */
struct g_mirror_disk_sync d_sync;/* Sync information. */
LIST_ENTRY(g_mirror_disk) d_next;
};
#define d_name d_consumer->provider->name
#define G_MIRROR_EVENT_DONTWAIT 0x1
#define G_MIRROR_EVENT_WAIT 0x2
#define G_MIRROR_EVENT_DEVICE 0x4
#define G_MIRROR_EVENT_DONE 0x8
struct g_mirror_event {
struct g_mirror_disk *e_disk;
int e_state;
int e_flags;
int e_error;
TAILQ_ENTRY(g_mirror_event) e_next;
};
#define G_MIRROR_DEVICE_FLAG_DESTROY 0x0100000000000000ULL
#define G_MIRROR_DEVICE_FLAG_WAIT 0x0200000000000000ULL
#define G_MIRROR_DEVICE_FLAG_DESTROYING 0x0400000000000000ULL
#define G_MIRROR_DEVICE_FLAG_TASTING 0x0800000000000000ULL
#define G_MIRROR_DEVICE_STATE_STARTING 0
#define G_MIRROR_DEVICE_STATE_RUNNING 1
/* Bump syncid on first write. */
#define G_MIRROR_BUMP_SYNCID 0x1
/* Bump genid immediately. */
#define G_MIRROR_BUMP_GENID 0x2
struct g_mirror_softc {
u_int sc_state; /* Device state. */
uint32_t sc_slice; /* Slice size. */
uint8_t sc_balance; /* Balance algorithm. */
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; /* Mirror 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. */
LIST_HEAD(, g_mirror_disk) sc_disks;
u_int sc_ndisks; /* Number of disks. */
struct g_mirror_disk *sc_hint;
u_int sc_genid; /* Generation ID. */
u_int sc_syncid; /* Synchronization ID. */
int sc_bump_id;
struct g_mirror_device_sync sc_sync;
int sc_idle; /* DIRTY flags removed. */
time_t sc_last_write;
u_int sc_writes;
TAILQ_HEAD(, g_mirror_event) sc_events;
struct mtx sc_events_mtx;
struct callout sc_callout;
struct root_hold_token *sc_rootmount;
};
#define sc_name sc_geom->name
u_int g_mirror_ndisks(struct g_mirror_softc *sc, int state);
#define G_MIRROR_DESTROY_SOFT 0
#define G_MIRROR_DESTROY_DELAYED 1
#define G_MIRROR_DESTROY_HARD 2
int g_mirror_destroy(struct g_mirror_softc *sc, int how);
int g_mirror_event_send(void *arg, int state, int flags);
struct g_mirror_metadata;
int g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
struct g_mirror_metadata *md);
int g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md);
void g_mirror_fill_metadata(struct g_mirror_softc *sc,
struct g_mirror_disk *disk, struct g_mirror_metadata *md);
void g_mirror_update_metadata(struct g_mirror_disk *disk);
g_ctl_req_t g_mirror_config;
#endif /* _KERNEL */
struct g_mirror_metadata {
char md_magic[16]; /* Magic value. */
uint32_t md_version; /* Version number. */
char md_name[16]; /* Mirror name. */
uint32_t md_mid; /* Mirror unique ID. */
uint32_t md_did; /* Disk unique ID. */
uint8_t md_all; /* Number of disks in mirror. */
uint32_t md_genid; /* Generation ID. */
uint32_t md_syncid; /* Synchronization ID. */
uint8_t md_priority; /* Disk priority. */
uint32_t md_slice; /* Slice size. */
uint8_t md_balance; /* Balance type. */
uint64_t md_mediasize; /* Size of the smallest
disk in mirror. */
uint32_t md_sectorsize; /* Sector size. */
uint64_t md_sync_offset; /* Synchronized offset. */
uint64_t md_mflags; /* Additional mirror 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
mirror_metadata_encode(struct g_mirror_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_mid);
le32enc(data + 40, md->md_did);
*(data + 44) = md->md_all;
le32enc(data + 45, md->md_genid);
le32enc(data + 49, md->md_syncid);
*(data + 53) = md->md_priority;
le32enc(data + 54, md->md_slice);
*(data + 58) = md->md_balance;
le64enc(data + 59, md->md_mediasize);
le32enc(data + 67, md->md_sectorsize);
le64enc(data + 71, md->md_sync_offset);
le64enc(data + 79, md->md_mflags);
le64enc(data + 87, md->md_dflags);
bcopy(md->md_provider, data + 95, 16);
le64enc(data + 111, md->md_provsize);
MD5Init(&ctx);
MD5Update(&ctx, data, 119);
MD5Final(md->md_hash, &ctx);
bcopy(md->md_hash, data + 119, 16);
}
static __inline int
mirror_metadata_decode_v0v1(const u_char *data, struct g_mirror_metadata *md)
{
MD5_CTX ctx;
bcopy(data + 20, md->md_name, 16);
md->md_mid = le32dec(data + 36);
md->md_did = le32dec(data + 40);
md->md_all = *(data + 44);
md->md_syncid = le32dec(data + 45);
md->md_priority = *(data + 49);
md->md_slice = le32dec(data + 50);
md->md_balance = *(data + 54);
md->md_mediasize = le64dec(data + 55);
md->md_sectorsize = le32dec(data + 63);
md->md_sync_offset = le64dec(data + 67);
md->md_mflags = le64dec(data + 75);
md->md_dflags = le64dec(data + 83);
bcopy(data + 91, md->md_provider, 16);
bcopy(data + 107, md->md_hash, 16);
MD5Init(&ctx);
MD5Update(&ctx, data, 107);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 107, 16) != 0)
return (EINVAL);
/* New fields. */
md->md_genid = 0;
md->md_provsize = 0;
return (0);
}
static __inline int
mirror_metadata_decode_v2(const u_char *data, struct g_mirror_metadata *md)
{
MD5_CTX ctx;
bcopy(data + 20, md->md_name, 16);
md->md_mid = le32dec(data + 36);
md->md_did = le32dec(data + 40);
md->md_all = *(data + 44);
md->md_genid = le32dec(data + 45);
md->md_syncid = le32dec(data + 49);
md->md_priority = *(data + 53);
md->md_slice = le32dec(data + 54);
md->md_balance = *(data + 58);
md->md_mediasize = le64dec(data + 59);
md->md_sectorsize = le32dec(data + 67);
md->md_sync_offset = le64dec(data + 71);
md->md_mflags = le64dec(data + 79);
md->md_dflags = le64dec(data + 87);
bcopy(data + 95, md->md_provider, 16);
bcopy(data + 111, md->md_hash, 16);
MD5Init(&ctx);
MD5Update(&ctx, data, 111);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 111, 16) != 0)
return (EINVAL);
/* New fields. */
md->md_provsize = 0;
return (0);
}
static __inline int
mirror_metadata_decode_v3v4(const u_char *data, struct g_mirror_metadata *md)
{
MD5_CTX ctx;
bcopy(data + 20, md->md_name, 16);
md->md_mid = le32dec(data + 36);
md->md_did = le32dec(data + 40);
md->md_all = *(data + 44);
md->md_genid = le32dec(data + 45);
md->md_syncid = le32dec(data + 49);
md->md_priority = *(data + 53);
md->md_slice = le32dec(data + 54);
md->md_balance = *(data + 58);
md->md_mediasize = le64dec(data + 59);
md->md_sectorsize = le32dec(data + 67);
md->md_sync_offset = le64dec(data + 71);
md->md_mflags = le64dec(data + 79);
md->md_dflags = le64dec(data + 87);
bcopy(data + 95, md->md_provider, 16);
md->md_provsize = le64dec(data + 111);
bcopy(data + 119, md->md_hash, 16);
MD5Init(&ctx);
MD5Update(&ctx, data, 119);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 119, 16) != 0)
return (EINVAL);
return (0);
}
static __inline int
mirror_metadata_decode(const u_char *data, struct g_mirror_metadata *md)
{
int error;
bcopy(data, md->md_magic, 16);
md->md_version = le32dec(data + 16);
switch (md->md_version) {
case 0:
case 1:
error = mirror_metadata_decode_v0v1(data, md);
break;
case 2:
error = mirror_metadata_decode_v2(data, md);
break;
case 3:
case 4:
error = mirror_metadata_decode_v3v4(data, md);
break;
default:
error = EINVAL;
break;
}
return (error);
}
static __inline const char *
balance_name(u_int balance)
{
static const char *algorithms[] = {
[G_MIRROR_BALANCE_NONE] = "none",
[G_MIRROR_BALANCE_ROUND_ROBIN] = "round-robin",
[G_MIRROR_BALANCE_LOAD] = "load",
[G_MIRROR_BALANCE_SPLIT] = "split",
[G_MIRROR_BALANCE_PREFER] = "prefer",
[G_MIRROR_BALANCE_MAX + 1] = "unknown"
};
if (balance > G_MIRROR_BALANCE_MAX)
balance = G_MIRROR_BALANCE_MAX + 1;
return (algorithms[balance]);
}
static __inline int
balance_id(const char *name)
{
static const char *algorithms[] = {
[G_MIRROR_BALANCE_NONE] = "none",
[G_MIRROR_BALANCE_ROUND_ROBIN] = "round-robin",
[G_MIRROR_BALANCE_LOAD] = "load",
[G_MIRROR_BALANCE_SPLIT] = "split",
[G_MIRROR_BALANCE_PREFER] = "prefer"
};
int n;
for (n = G_MIRROR_BALANCE_MIN; n <= G_MIRROR_BALANCE_MAX; n++) {
if (strcmp(name, algorithms[n]) == 0)
return (n);
}
return (-1);
}
static __inline void
mirror_metadata_dump(const struct g_mirror_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(" mid: %u\n", (u_int)md->md_mid);
printf(" did: %u\n", (u_int)md->md_did);
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(" priority: %u\n", (u_int)md->md_priority);
printf(" slice: %u\n", (u_int)md->md_slice);
printf(" balance: %s\n", balance_name((u_int)md->md_balance));
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_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
printf(" NOFAILSYNC");
if ((md->md_mflags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0)
printf(" NOAUTOSYNC");
}
printf("\n");
printf(" dflags:");
if (md->md_dflags == 0)
printf(" NONE");
else {
if ((md->md_dflags & G_MIRROR_DISK_FLAG_DIRTY) != 0)
printf(" DIRTY");
if ((md->md_dflags & G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0)
printf(" SYNCHRONIZING");
if ((md->md_dflags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0)
printf(" FORCE_SYNC");
if ((md->md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0)
printf(" INACTIVE");
}
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_MIRROR_H_ */