sys/geom/journal/g_journal.h

   1 /*-
   2  * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #ifndef _G_JOURNAL_H_
  30 #define _G_JOURNAL_H_
  31
  32 #include <sys/endian.h>
  33 #include <sys/md5.h>
  34 #ifdef _KERNEL
  35 #include <sys/bio.h>
  36 #endif
  37
  38 #define G_JOURNAL_CLASS_NAME    "JOURNAL"
  39
  40 #define G_JOURNAL_MAGIC         "GEOM::JOURNAL"
  41 /*
  42  * Version history:
  43  * 0 - Initial version number.
  44  */
  45 #define G_JOURNAL_VERSION       0
  46
  47 #ifdef _KERNEL
  48 extern int g_journal_debug;
  49
  50 #define GJ_DEBUG(lvl, ...)      do {                                    \
  51         if (g_journal_debug >= (lvl)) {                                 \
  52                 printf("GEOM_JOURNAL");                                 \
  53                 if (g_journal_debug > 0)                                \
  54                         printf("[%u]", lvl);                            \
  55                 printf(": ");                                           \
  56                 printf(__VA_ARGS__);                                    \
  57                 printf("\n");                                           \
  58         }                                                               \
  59 } while (0)
  60 #define GJ_LOGREQ(lvl, bp, ...) do {                                    \
  61         if (g_journal_debug >= (lvl)) {                                 \
  62                 printf("GEOM_JOURNAL");                                 \
  63                 if (g_journal_debug > 0)                                \
  64                         printf("[%u]", lvl);                            \
  65                 printf(": ");                                           \
  66                 printf(__VA_ARGS__);                                    \
  67                 printf(" ");                                            \
  68                 g_print_bio(bp);                                        \
  69                 printf("\n");                                           \
  70         }                                                               \
  71 } while (0)
  72
  73 #define JEMPTY(sc)      ((sc)->sc_journal_offset -                      \
  74                          (sc)->sc_jprovider->sectorsize ==              \
  75                          (sc)->sc_active.jj_offset &&                   \
  76                          (sc)->sc_current_count == 0)
  77
  78 #define GJ_BIO_REGULAR          0x00
  79 #define GJ_BIO_READ             0x01
  80 #define GJ_BIO_JOURNAL          0x02
  81 #define GJ_BIO_COPY             0x03
  82 #define GJ_BIO_MASK             0x0f
  83
  84 #if 0
  85 #define GJF_BIO_DONT_FREE       0x10
  86 #define GJF_BIO_MASK            0xf0
  87 #endif
  88
  89 #define GJF_DEVICE_HARDCODED            0x0001
  90 #define GJF_DEVICE_DESTROY              0x0010
  91 #define GJF_DEVICE_SWITCH               0x0020
  92 #define GJF_DEVICE_BEFORE_SWITCH        0x0040
  93 #define GJF_DEVICE_CLEAN                0x0080
  94 #define GJF_DEVICE_CHECKSUM             0x0100
  95
  96 #define GJ_HARD_LIMIT           64
  97
  98 /*
  99  * We keep pointers to journaled data in bio structure and because we
 100  * need to store two off_t values (offset in data provider and offset in
 101  * journal), we have to borrow bio_completed field for this.
 102  */
 103 #define bio_joffset     bio_completed
 104 /*
 105  * Use bio_caller1 field as a pointer in queue.
 106  */
 107 #define bio_next        bio_caller1
 108
 109 /*
 110  * There are two such structures maintained inside each journaled device.
 111  * One describes active part of the journal, were recent requests are stored.
 112  * The second describes the last consistent part of the journal with requests
 113  * that are copied to the destination provider.
 114  */
 115 struct g_journal_journal {
 116         struct bio      *jj_queue;      /* Cached journal entries. */
 117         off_t            jj_offset;     /* Journal's start offset. */
 118 };
 119
 120 struct g_journal_softc {
 121         uint32_t         sc_id;
 122         uint8_t          sc_type;
 123         uint8_t          sc_orig_type;
 124         struct g_geom   *sc_geom;
 125         u_int            sc_flags;
 126         struct mtx       sc_mtx;
 127         off_t            sc_mediasize;
 128         u_int            sc_sectorsize;
 129 #define GJ_FLUSH_DATA           0x01
 130 #define GJ_FLUSH_JOURNAL        0x02
 131         u_int            sc_bio_flush;
 132
 133         uint32_t         sc_journal_id;
 134         uint32_t         sc_journal_next_id;
 135         int              sc_journal_copying;
 136         off_t            sc_journal_offset;
 137         off_t            sc_journal_previous_id;
 138
 139         struct bio_queue_head sc_back_queue;
 140         struct bio_queue_head sc_regular_queue;
 141
 142         struct bio_queue_head sc_delayed_queue;
 143         int              sc_delayed_count;
 144
 145         struct bio      *sc_current_queue;
 146         int              sc_current_count;
 147
 148         struct bio      *sc_flush_queue;
 149         int              sc_flush_count;
 150         int              sc_flush_in_progress;
 151
 152         struct bio      *sc_copy_queue;
 153         int              sc_copy_in_progress;
 154
 155         struct g_consumer *sc_dconsumer;
 156         struct g_consumer *sc_jconsumer;
 157
 158         struct g_journal_journal sc_inactive;
 159         struct g_journal_journal sc_active;
 160
 161         off_t            sc_jstart;     /* Journal space start offset. */
 162         off_t            sc_jend;       /* Journal space end offset. */
 163
 164         struct callout   sc_callout;
 165         struct proc     *sc_worker;
 166
 167         struct root_hold_token *sc_rootmount;
 168 };
 169 #define sc_dprovider    sc_dconsumer->provider
 170 #define sc_jprovider    sc_jconsumer->provider
 171 #define sc_name         sc_dprovider->name
 172
 173 #define GJQ_INSERT_HEAD(head, bp)       do {                            \
 174         (bp)->bio_next = (head);                                        \
 175         (head) = (bp);                                                  \
 176 } while (0)
 177 #define GJQ_INSERT_AFTER(head, bp, pbp) do {                            \
 178         if ((pbp) == NULL)                                              \
 179                 GJQ_INSERT_HEAD(head, bp);                              \
 180         else {                                                          \
 181                 (bp)->bio_next = (pbp)->bio_next;                       \
 182                 (pbp)->bio_next = (bp);                                 \
 183         }                                                               \
 184 } while (0)
 185 #define GJQ_LAST(head, bp) do {                                         \
 186         struct bio *_bp;                                                \
 187                                                                         \
 188         if ((head) == NULL) {                                           \
 189                 (bp) = (head);                                          \
 190                 break;                                                  \
 191         }                                                               \
 192         for (_bp = (head); _bp->bio_next != NULL; _bp = _bp->bio_next)  \
 193                 continue;                                               \
 194         (bp) = (_bp);                                                   \
 195 } while (0)
 196 #define GJQ_FIRST(head) (head)
 197 #define GJQ_REMOVE(head, bp)    do {                                    \
 198         struct bio *_bp;                                                \
 199                                                                         \
 200         if ((head) == (bp)) {                                           \
 201                 (head) = (bp)->bio_next;                                \
 202                 (bp)->bio_next = NULL;                                  \
 203                 break;                                                  \
 204         }                                                               \
 205         for (_bp = (head); _bp->bio_next != NULL; _bp = _bp->bio_next) {\
 206                 if (_bp->bio_next == (bp))                              \
 207                         break;                                          \
 208         }                                                               \
 209         KASSERT(_bp->bio_next != NULL, ("NULL bio_next"));              \
 210         KASSERT(_bp->bio_next == (bp), ("bio_next != bp"));             \
 211         _bp->bio_next = (bp)->bio_next;                                 \
 212         (bp)->bio_next = NULL;                                          \
 213 } while (0)
 214 #define GJQ_FOREACH(head, bp)                                           \
 215         for ((bp) = (head); (bp) != NULL; (bp) = (bp)->bio_next)
 216
 217 #define GJ_HEADER_MAGIC "GJHDR"
 218
 219 struct g_journal_header {
 220         char            jh_magic[sizeof(GJ_HEADER_MAGIC)];
 221         uint32_t        jh_journal_id;
 222         uint32_t        jh_journal_next_id;
 223 } __packed;
 224
 225 struct g_journal_entry {
 226         uint64_t        je_joffset;
 227         uint64_t        je_offset;
 228         uint64_t        je_length;
 229 } __packed;
 230
 231 #define GJ_RECORD_HEADER_MAGIC          "GJRHDR"
 232 #define GJ_RECORD_HEADER_NENTRIES       (20)
 233 #define GJ_RECORD_MAX_SIZE(sc)  \
 234         ((sc)->sc_jprovider->sectorsize + GJ_RECORD_HEADER_NENTRIES * MAXPHYS)
 235 #define GJ_VALIDATE_OFFSET(offset, sc)  do {                            \
 236         if ((offset) + GJ_RECORD_MAX_SIZE(sc) >= (sc)->sc_jend) {       \
 237                 (offset) = (sc)->sc_jstart;                             \
 238                 GJ_DEBUG(2, "Starting from the beginning (%s).",                \
 239                     (sc)->sc_name);                                     \
 240         }                                                               \
 241 } while (0)
 242
 243 struct g_journal_record_header {
 244         char            jrh_magic[sizeof(GJ_RECORD_HEADER_MAGIC)];
 245         uint32_t        jrh_journal_id;
 246         uint16_t        jrh_nentries;
 247         u_char          jrh_sum[8];
 248         struct g_journal_entry jrh_entries[GJ_RECORD_HEADER_NENTRIES];
 249 } __packed;
 250
 251 typedef int (g_journal_clean_t)(struct mount *mp);
 252 typedef void (g_journal_dirty_t)(struct g_consumer *cp);
 253
 254 struct g_journal_desc {
 255         const char              *jd_fstype;
 256         g_journal_clean_t       *jd_clean;
 257         g_journal_dirty_t       *jd_dirty;
 258 };
 259
 260 /* Supported file systems. */
 261 extern const struct g_journal_desc g_journal_ufs;
 262
 263 #define GJ_TIMER_START(lvl, bt) do {                                    \
 264         if (g_journal_debug >= (lvl))                                   \
 265                 binuptime(bt);                                          \
 266 } while (0)
 267 #define GJ_TIMER_STOP(lvl, bt, ...)     do {                            \
 268         if (g_journal_debug >= (lvl)) {                                 \
 269                 struct bintime _bt2;                                    \
 270                 struct timeval _tv;                                     \
 271                                                                         \
 272                 binuptime(&_bt2);                                       \
 273                 bintime_sub(&_bt2, bt);                                 \
 274                 bintime2timeval(&_bt2, &_tv);                           \
 275                 printf("GEOM_JOURNAL");                                 \
 276                 if (g_journal_debug > 0)                                \
 277                         printf("[%u]", lvl);                            \
 278                 printf(": ");                                           \
 279                 printf(__VA_ARGS__);                                    \
 280                 printf(": %jd.%06jds\n", (intmax_t)_tv.tv_sec,          \
 281                     (intmax_t)_tv.tv_usec);                             \
 282         }                                                               \
 283 } while (0)
 284 #endif  /* _KERNEL */
 285
 286 #define GJ_TYPE_DATA            0x01
 287 #define GJ_TYPE_JOURNAL         0x02
 288 #define GJ_TYPE_COMPLETE        (GJ_TYPE_DATA|GJ_TYPE_JOURNAL)
 289
 290 #define GJ_FLAG_CLEAN           0x01
 291 #define GJ_FLAG_CHECKSUM        0x02
 292
 293 struct g_journal_metadata {
 294         char            md_magic[16];   /* Magic value. */
 295         uint32_t        md_version;     /* Version number. */
 296         uint32_t        md_id;          /* Journal unique ID. */
 297         uint8_t         md_type;        /* Provider type. */
 298         uint64_t        md_jstart;      /* Journal space start offset. */
 299         uint64_t        md_jend;        /* Journal space end offset. */
 300         uint64_t        md_joffset;     /* Last known consistent journal offset. */
 301         uint32_t        md_jid;         /* Last known consistent journal ID. */
 302         uint64_t        md_flags;       /* Journal flags. */
 303         char            md_provider[16]; /* Hardcoded provider. */
 304         uint64_t        md_provsize;    /* Provider's size. */
 305         u_char          md_hash[16];    /* MD5 hash. */
 306 };
 307 static __inline void
 308 journal_metadata_encode(struct g_journal_metadata *md, u_char *data)
 309 {
 310         MD5_CTX ctx;
 311
 312         bcopy(md->md_magic, data, 16);
 313         le32enc(data + 16, md->md_version);
 314         le32enc(data + 20, md->md_id);
 315         *(data + 24) = md->md_type;
 316         le64enc(data + 25, md->md_jstart);
 317         le64enc(data + 33, md->md_jend);
 318         le64enc(data + 41, md->md_joffset);
 319         le32enc(data + 49, md->md_jid);
 320         le64enc(data + 53, md->md_flags);
 321         bcopy(md->md_provider, data + 61, 16);
 322         le64enc(data + 77, md->md_provsize);
 323         MD5Init(&ctx);
 324         MD5Update(&ctx, data, 85);
 325         MD5Final(md->md_hash, &ctx);
 326         bcopy(md->md_hash, data + 85, 16);
 327 }
 328 static __inline int
 329 journal_metadata_decode_v0(const u_char *data, struct g_journal_metadata *md)
 330 {
 331         MD5_CTX ctx;
 332
 333         md->md_id = le32dec(data + 20);
 334         md->md_type = *(data + 24);
 335         md->md_jstart = le64dec(data + 25);
 336         md->md_jend = le64dec(data + 33);
 337         md->md_joffset = le64dec(data + 41);
 338         md->md_jid = le32dec(data + 49);
 339         md->md_flags = le64dec(data + 53);
 340         bcopy(data + 61, md->md_provider, 16);
 341         md->md_provsize = le64dec(data + 77);
 342         MD5Init(&ctx);
 343         MD5Update(&ctx, data, 85);
 344         MD5Final(md->md_hash, &ctx);
 345         if (bcmp(md->md_hash, data + 85, 16) != 0)
 346                 return (EINVAL);
 347         return (0);
 348 }
 349 static __inline int
 350 journal_metadata_decode(const u_char *data, struct g_journal_metadata *md)
 351 {
 352         int error;
 353
 354         bcopy(data, md->md_magic, 16);
 355         md->md_version = le32dec(data + 16);
 356         switch (md->md_version) {
 357         case 0:
 358                 error = journal_metadata_decode_v0(data, md);
 359                 break;
 360         default:
 361                 error = EINVAL;
 362                 break;
 363         }
 364         return (error);
 365 }
 366
 367 static __inline void
 368 journal_metadata_dump(const struct g_journal_metadata *md)
 369 {
 370         static const char hex[] = "0123456789abcdef";
 371         char hash[16 * 2 + 1];
 372         u_int i;
 373
 374         printf("     magic: %s\n", md->md_magic);
 375         printf("   version: %u\n", (u_int)md->md_version);
 376         printf("        id: %u\n", (u_int)md->md_id);
 377         printf("      type: %u\n", (u_int)md->md_type);
 378         printf("     start: %ju\n", (uintmax_t)md->md_jstart);
 379         printf("       end: %ju\n", (uintmax_t)md->md_jend);
 380         printf("   joffset: %ju\n", (uintmax_t)md->md_joffset);
 381         printf("       jid: %u\n", (u_int)md->md_jid);
 382         printf("     flags: %u\n", (u_int)md->md_flags);
 383         printf("hcprovider: %s\n", md->md_provider);
 384         printf("  provsize: %ju\n", (uintmax_t)md->md_provsize);
 385         bzero(hash, sizeof(hash));
 386         for (i = 0; i < 16; i++) {
 387                 hash[i * 2] = hex[md->md_hash[i] >> 4];
 388                 hash[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
 389         }
 390         printf("  MD5 hash: %s\n", hash);
 391 }
 392 #endif  /* !_G_JOURNAL_H_ */