| Current Path : /usr/src/sys/geom/journal/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sys/geom/journal/g_journal.h |
/*-
* Copyright (c) 2005-2006 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/journal/g_journal.h 185693 2008-12-06 11:33:10Z trasz $
*/
#ifndef _G_JOURNAL_H_
#define _G_JOURNAL_H_
#include <sys/endian.h>
#include <sys/md5.h>
#ifdef _KERNEL
#include <sys/bio.h>
#endif
#define G_JOURNAL_CLASS_NAME "JOURNAL"
#define G_JOURNAL_MAGIC "GEOM::JOURNAL"
/*
* Version history:
* 0 - Initial version number.
*/
#define G_JOURNAL_VERSION 0
#ifdef _KERNEL
extern int g_journal_debug;
#define GJ_DEBUG(lvl, ...) do { \
if (g_journal_debug >= (lvl)) { \
printf("GEOM_JOURNAL"); \
if (g_journal_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf("\n"); \
} \
} while (0)
#define GJ_LOGREQ(lvl, bp, ...) do { \
if (g_journal_debug >= (lvl)) { \
printf("GEOM_JOURNAL"); \
if (g_journal_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf(" "); \
g_print_bio(bp); \
printf("\n"); \
} \
} while (0)
#define JEMPTY(sc) ((sc)->sc_journal_offset - \
(sc)->sc_jprovider->sectorsize == \
(sc)->sc_active.jj_offset && \
(sc)->sc_current_count == 0)
#define GJ_BIO_REGULAR 0x00
#define GJ_BIO_READ 0x01
#define GJ_BIO_JOURNAL 0x02
#define GJ_BIO_COPY 0x03
#define GJ_BIO_MASK 0x0f
#if 0
#define GJF_BIO_DONT_FREE 0x10
#define GJF_BIO_MASK 0xf0
#endif
#define GJF_DEVICE_HARDCODED 0x0001
#define GJF_DEVICE_DESTROY 0x0010
#define GJF_DEVICE_SWITCH 0x0020
#define GJF_DEVICE_BEFORE_SWITCH 0x0040
#define GJF_DEVICE_CLEAN 0x0080
#define GJF_DEVICE_CHECKSUM 0x0100
#define GJ_HARD_LIMIT 64
/*
* We keep pointers to journaled data in bio structure and because we
* need to store two off_t values (offset in data provider and offset in
* journal), we have to borrow bio_completed field for this.
*/
#define bio_joffset bio_completed
/*
* Use bio_caller1 field as a pointer in queue.
*/
#define bio_next bio_caller1
/*
* There are two such structures maintained inside each journaled device.
* One describes active part of the journal, were recent requests are stored.
* The second describes the last consistent part of the journal with requests
* that are copied to the destination provider.
*/
struct g_journal_journal {
struct bio *jj_queue; /* Cached journal entries. */
off_t jj_offset; /* Journal's start offset. */
};
struct g_journal_softc {
uint32_t sc_id;
uint8_t sc_type;
uint8_t sc_orig_type;
struct g_geom *sc_geom;
u_int sc_flags;
struct mtx sc_mtx;
off_t sc_mediasize;
u_int sc_sectorsize;
#define GJ_FLUSH_DATA 0x01
#define GJ_FLUSH_JOURNAL 0x02
u_int sc_bio_flush;
uint32_t sc_journal_id;
uint32_t sc_journal_next_id;
int sc_journal_copying;
off_t sc_journal_offset;
off_t sc_journal_previous_id;
struct bio_queue_head sc_back_queue;
struct bio_queue_head sc_regular_queue;
struct bio_queue_head sc_delayed_queue;
int sc_delayed_count;
struct bio *sc_current_queue;
int sc_current_count;
struct bio *sc_flush_queue;
int sc_flush_count;
int sc_flush_in_progress;
struct bio *sc_copy_queue;
int sc_copy_in_progress;
struct g_consumer *sc_dconsumer;
struct g_consumer *sc_jconsumer;
struct g_journal_journal sc_inactive;
struct g_journal_journal sc_active;
off_t sc_jstart; /* Journal space start offset. */
off_t sc_jend; /* Journal space end offset. */
struct callout sc_callout;
struct proc *sc_worker;
struct root_hold_token *sc_rootmount;
};
#define sc_dprovider sc_dconsumer->provider
#define sc_jprovider sc_jconsumer->provider
#define sc_name sc_dprovider->name
#define GJQ_INSERT_HEAD(head, bp) do { \
(bp)->bio_next = (head); \
(head) = (bp); \
} while (0)
#define GJQ_INSERT_AFTER(head, bp, pbp) do { \
if ((pbp) == NULL) \
GJQ_INSERT_HEAD(head, bp); \
else { \
(bp)->bio_next = (pbp)->bio_next; \
(pbp)->bio_next = (bp); \
} \
} while (0)
#define GJQ_FIRST(head) (head)
#define GJQ_REMOVE(head, bp) do { \
struct bio *_bp; \
\
if ((head) == (bp)) { \
(head) = (bp)->bio_next; \
(bp)->bio_next = NULL; \
break; \
} \
for (_bp = (head); _bp->bio_next != NULL; _bp = _bp->bio_next) {\
if (_bp->bio_next == (bp)) \
break; \
} \
KASSERT(_bp->bio_next != NULL, ("NULL bio_next")); \
KASSERT(_bp->bio_next == (bp), ("bio_next != bp")); \
_bp->bio_next = (bp)->bio_next; \
(bp)->bio_next = NULL; \
} while (0)
#define GJQ_FOREACH(head, bp) \
for ((bp) = (head); (bp) != NULL; (bp) = (bp)->bio_next)
#define GJ_HEADER_MAGIC "GJHDR"
struct g_journal_header {
char jh_magic[sizeof(GJ_HEADER_MAGIC)];
uint32_t jh_journal_id;
uint32_t jh_journal_next_id;
} __packed;
struct g_journal_entry {
uint64_t je_joffset;
uint64_t je_offset;
uint64_t je_length;
} __packed;
#define GJ_RECORD_HEADER_MAGIC "GJRHDR"
#define GJ_RECORD_HEADER_NENTRIES (20)
#define GJ_RECORD_MAX_SIZE(sc) \
((sc)->sc_jprovider->sectorsize + GJ_RECORD_HEADER_NENTRIES * MAXPHYS)
#define GJ_VALIDATE_OFFSET(offset, sc) do { \
if ((offset) + GJ_RECORD_MAX_SIZE(sc) >= (sc)->sc_jend) { \
(offset) = (sc)->sc_jstart; \
GJ_DEBUG(2, "Starting from the begining (%s).", \
(sc)->sc_name); \
} \
} while (0)
struct g_journal_record_header {
char jrh_magic[sizeof(GJ_RECORD_HEADER_MAGIC)];
uint32_t jrh_journal_id;
uint16_t jrh_nentries;
u_char jrh_sum[8];
struct g_journal_entry jrh_entries[GJ_RECORD_HEADER_NENTRIES];
} __packed;
typedef int (g_journal_clean_t)(struct mount *mp);
typedef void (g_journal_dirty_t)(struct g_consumer *cp);
struct g_journal_desc {
const char *jd_fstype;
g_journal_clean_t *jd_clean;
g_journal_dirty_t *jd_dirty;
};
/* Supported file systems. */
extern const struct g_journal_desc g_journal_ufs;
#define GJ_TIMER_START(lvl, bt) do { \
if (g_journal_debug >= (lvl)) \
binuptime(bt); \
} while (0)
#define GJ_TIMER_STOP(lvl, bt, ...) do { \
if (g_journal_debug >= (lvl)) { \
struct bintime _bt2; \
struct timeval _tv; \
\
binuptime(&_bt2); \
bintime_sub(&_bt2, bt); \
bintime2timeval(&_bt2, &_tv); \
printf("GEOM_JOURNAL"); \
if (g_journal_debug > 0) \
printf("[%u]", lvl); \
printf(": "); \
printf(__VA_ARGS__); \
printf(": %jd.%06jds\n", (intmax_t)_tv.tv_sec, \
(intmax_t)_tv.tv_usec); \
} \
} while (0)
#endif /* _KERNEL */
#define GJ_TYPE_DATA 0x01
#define GJ_TYPE_JOURNAL 0x02
#define GJ_TYPE_COMPLETE (GJ_TYPE_DATA|GJ_TYPE_JOURNAL)
#define GJ_FLAG_CLEAN 0x01
#define GJ_FLAG_CHECKSUM 0x02
struct g_journal_metadata {
char md_magic[16]; /* Magic value. */
uint32_t md_version; /* Version number. */
uint32_t md_id; /* Journal unique ID. */
uint8_t md_type; /* Provider type. */
uint64_t md_jstart; /* Journal space start offset. */
uint64_t md_jend; /* Journal space end offset. */
uint64_t md_joffset; /* Last known consistent journal offset. */
uint32_t md_jid; /* Last known consistent journal ID. */
uint64_t md_flags; /* Journal flags. */
char md_provider[16]; /* Hardcoded provider. */
uint64_t md_provsize; /* Provider's size. */
u_char md_hash[16]; /* MD5 hash. */
};
static __inline void
journal_metadata_encode(struct g_journal_metadata *md, u_char *data)
{
MD5_CTX ctx;
bcopy(md->md_magic, data, 16);
le32enc(data + 16, md->md_version);
le32enc(data + 20, md->md_id);
*(data + 24) = md->md_type;
le64enc(data + 25, md->md_jstart);
le64enc(data + 33, md->md_jend);
le64enc(data + 41, md->md_joffset);
le32enc(data + 49, md->md_jid);
le64enc(data + 53, md->md_flags);
bcopy(md->md_provider, data + 61, 16);
le64enc(data + 77, md->md_provsize);
MD5Init(&ctx);
MD5Update(&ctx, data, 85);
MD5Final(md->md_hash, &ctx);
bcopy(md->md_hash, data + 85, 16);
}
static __inline int
journal_metadata_decode_v0(const u_char *data, struct g_journal_metadata *md)
{
MD5_CTX ctx;
md->md_id = le32dec(data + 20);
md->md_type = *(data + 24);
md->md_jstart = le64dec(data + 25);
md->md_jend = le64dec(data + 33);
md->md_joffset = le64dec(data + 41);
md->md_jid = le32dec(data + 49);
md->md_flags = le64dec(data + 53);
bcopy(data + 61, md->md_provider, 16);
md->md_provsize = le64dec(data + 77);
MD5Init(&ctx);
MD5Update(&ctx, data, 85);
MD5Final(md->md_hash, &ctx);
if (bcmp(md->md_hash, data + 85, 16) != 0)
return (EINVAL);
return (0);
}
static __inline int
journal_metadata_decode(const u_char *data, struct g_journal_metadata *md)
{
int error;
bcopy(data, md->md_magic, 16);
md->md_version = le32dec(data + 16);
switch (md->md_version) {
case 0:
error = journal_metadata_decode_v0(data, md);
break;
default:
error = EINVAL;
break;
}
return (error);
}
static __inline void
journal_metadata_dump(const struct g_journal_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(" id: %u\n", (u_int)md->md_id);
printf(" type: %u\n", (u_int)md->md_type);
printf(" start: %ju\n", (uintmax_t)md->md_jstart);
printf(" end: %ju\n", (uintmax_t)md->md_jend);
printf(" joffset: %ju\n", (uintmax_t)md->md_joffset);
printf(" jid: %u\n", (u_int)md->md_jid);
printf(" flags: %u\n", (u_int)md->md_flags);
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_JOURNAL_H_ */