osl.c

   1 /*
   2  * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file osl.c Object storage layer functions. */
   8 #include <dirent.h> /* readdir() */
   9 #include <assert.h>
  10
  11 #include "log.h"
  12 #include "osl.h"
  13 #include "error.h"
  14 #include "fd.h"
  15 #include "list.h"
  16 #include "osl_core.h"
  17
  18 /* Taken from Drepper: How to write shared libraries, Appendix B. */
  19 #include <stddef.h>
  20 #define MSGSTRFIELD(line) MSGSTRFIELD1(line)
  21 #define MSGSTRFIELD1(line) str##line
  22 static const union msgstr_t {
  23         struct {
  24 #define _S(n, s) char MSGSTRFIELD(__LINE__)[sizeof(s)];
  25 #include "errtab.h"
  26 #undef _S
  27         };
  28         char str[0];
  29 } msgstr = { {
  30 #define _S(n, s) s,
  31 #include "errtab.h"
  32 #undef _S
  33 } };
  34 static const unsigned int errmsgidx[] = {
  35 #define _S(n, s) [n] = offsetof(union msgstr_t, MSGSTRFIELD(__LINE__)),
  36 #include "errtab.h"
  37 #undef _S
  38 };
  39
  40 __export const char *osl_strerror(int num)
  41 {
  42         if (IS_SYSTEM_ERROR(num))
  43                 return strerror((num) & ((1 << SYSTEM_ERROR_BIT) - 1));
  44         return msgstr.str + errmsgidx[num];
  45 }
  46
  47 int loglevel = 0;
  48
  49 static void __attribute ((constructor)) init_loglevel(void)
  50 {
  51         char *p = getenv("OSL_LOGLEVEL");
  52
  53         /* don't log anything if unset */
  54         loglevel = p? atoi(p) : EMERG + 1;
  55 }
  56
  57 /**
  58  * The log function.
  59  *
  60  * \param ll Loglevel.
  61  * \param fmt Usual format string.
  62  *
  63  * All XXX_LOG() macros use this function.
  64  */
  65 __printf_2_3 void __log(int ll, const char* fmt,...)
  66 {
  67         va_list argp;
  68         FILE *outfd;
  69         struct tm *tm;
  70         time_t t1;
  71         char str[255] = "";
  72
  73         if (ll < loglevel)
  74                 return;
  75         outfd = stderr;
  76         time(&t1);
  77         tm = localtime(&t1);
  78         strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
  79         fprintf(outfd, "%s ", str);
  80         va_start(argp, fmt);
  81         vfprintf(outfd, fmt, argp);
  82         va_end(argp);
  83 }
  84
  85 /**
  86  * A wrapper for lseek(2).
  87  *
  88  * \param fd The file descriptor whose offset is to be to repositioned.
  89  * \param offset A value-result parameter.
  90  * \param whence Usual repositioning directive.
  91  *
  92  * Reposition the offset of the file descriptor \a fd to the argument \a offset
  93  * according to the directive \a whence. Upon successful return, \a offset
  94  * contains the resulting offset location as measured in bytes from the
  95  * beginning of the file.
  96  *
  97  * \return Positive on success. Otherwise, the function returns \p -E_OSL_LSEEK.
  98  *
  99  * \sa lseek(2).
 100  */
 101 static int __lseek(int fd, off_t *offset, int whence)
 102 {
 103         *offset = lseek(fd, *offset, whence);
 104         int ret = -E_OSL_LSEEK;
 105         if (*offset == -1)
 106                 return ret;
 107         return 1;
 108 }
 109
 110 static int append_file(const char *filename, char *header, size_t header_size,
 111         char *data, size_t data_size, uint32_t *new_pos)
 112 {
 113         int ret, fd;
 114
 115 //      DEBUG_LOG("appending %zu  + %zu bytes\n", header_size, data_size);
 116         ret = osl_open(filename, O_WRONLY | O_CREAT | O_APPEND, 0644);
 117         if (ret < 0)
 118                 return ret;
 119         fd = ret;
 120         if (header && header_size) {
 121                 ret = write_all(fd, header, &header_size);
 122                 if (ret < 0)
 123                         goto out;
 124         }
 125         ret = write_all(fd, data, &data_size);
 126         if (ret < 0)
 127                 goto out;
 128         if (new_pos) {
 129                 off_t offset = 0;
 130                 ret = __lseek(fd, &offset, SEEK_END);
 131                 if (ret < 0)
 132                         goto out;
 133 //              DEBUG_LOG("new file size: " FMT_OFF_T "\n", offset);
 134                 *new_pos = offset;
 135         }
 136         ret = 1;
 137 out:
 138         close(fd);
 139         return ret;
 140 }
 141
 142 static int verify_name(const char *name)
 143 {
 144         if (!name)
 145                 return -E_OSL_BAD_NAME;
 146         if (!*name)
 147                 return -E_OSL_BAD_NAME;
 148         if (strchr(name, '/'))
 149                 return -E_OSL_BAD_NAME;
 150         if (!strcmp(name, ".."))
 151                 return -E_OSL_BAD_NAME;
 152         if (!strcmp(name, "."))
 153                 return -E_OSL_BAD_NAME;
 154         return 1;
 155 }
 156
 157 int osl_hash_compare(const struct osl_object *obj1, const struct osl_object *obj2)
 158 {
 159         return hash_compare((HASH_TYPE *)obj1->data, (HASH_TYPE *)obj2->data);
 160 }
 161
 162 static char *disk_storage_dirname(const struct osl_table *t, unsigned col_num,
 163                 const char *ds_name)
 164 {
 165         char *dirname, *column_name = column_filename(t, col_num);
 166
 167         if (!column_name)
 168                 return NULL;
 169         if (!(t->desc->flags & OSL_LARGE_TABLE))
 170                 return column_name;
 171         dirname = make_message("%s/%.2s", column_name, ds_name);
 172         free(column_name);
 173         return dirname;
 174 }
 175
 176 static char *disk_storage_name_of_object(const struct osl_table *t,
 177         const struct osl_object *obj)
 178 {
 179         HASH_TYPE hash[HASH_SIZE];
 180         hash_object(obj, hash);
 181         return disk_storage_name_of_hash(t, hash);
 182 }
 183
 184 static int disk_storage_name_of_row(const struct osl_table *t,
 185                 const struct osl_row *row, char **name)
 186 {
 187         struct osl_object obj;
 188         int ret = osl_get_object(t, row, t->disk_storage_name_column, &obj);
 189
 190         if (ret < 0)
 191                 return ret;
 192         *name = disk_storage_name_of_object(t, &obj);
 193         if (*name)
 194                 return 1;
 195         return -ERRNO_TO_ERROR(ENOMEM);
 196 }
 197
 198 static void column_name_hash(const char *col_name, HASH_TYPE *hash)
 199 {
 200         hash_function(col_name, strlen(col_name), hash);
 201 }
 202
 203 static int init_column_descriptions(struct osl_table *t)
 204 {
 205         int i, j, ret;
 206         const struct osl_column_description *cd;
 207
 208         ret = -E_OSL_BAD_TABLE_DESC;
 209         ret = verify_name(t->desc->name);
 210         if (ret < 0)
 211                 goto err;
 212         ret = -E_OSL_BAD_DB_DIR;
 213         if (!t->desc->dir && (t->num_disk_storage_columns || t->num_mapped_columns))
 214                 goto err;
 215         /* the size of the index header without column descriptions */
 216         t->index_header_size = IDX_COLUMN_DESCRIPTIONS;
 217         FOR_EACH_COLUMN(i, t->desc, cd) {
 218                 struct osl_column *col = t->columns + i;
 219                 if (cd->storage_flags & OSL_RBTREE) {
 220                         if (!cd->compare_function)
 221                                 return -E_OSL_NO_COMPARE_FUNC;
 222                 }
 223                 if (cd->storage_type == OSL_NO_STORAGE)
 224                         continue;
 225                 ret = -E_OSL_NO_COLUMN_NAME;
 226                 if (!cd->name || !cd->name[0])
 227                         goto err;
 228                 ret = verify_name(cd->name);
 229                 if (ret < 0)
 230                         goto err;
 231                 t->index_header_size += index_column_description_size(cd->name);
 232                 column_name_hash(cd->name, col->name_hash);
 233                 ret = -E_OSL_DUPLICATE_COL_NAME;
 234                 for (j = i + 1; j < t->desc->num_columns; j++) {
 235                         const char *name2 = get_column_description(t->desc,
 236                                 j)->name;
 237                         if (cd->name && name2 && !strcmp(cd->name, name2))
 238                                 goto err;
 239                 }
 240         }
 241         return 1;
 242 err:
 243         return ret;
 244 }
 245
 246 /**
 247  * Initialize a struct table from given table description.
 248  *
 249  * \param desc The description of the osl table.
 250  * \param table_ptr Result is returned here.
 251  *
 252  * This function performs several sanity checks on \p desc and returns if any
 253  * of these tests fail. On success, a struct \p osl_table is allocated and
 254  * initialized with data derived from \p desc.
 255  *
 256  * \return Standard.
 257  *
 258  * \sa struct osl_table.
 259  */
 260 int init_table_structure(const struct osl_table_description *desc,
 261                 struct osl_table **table_ptr)
 262 {
 263         const struct osl_column_description *cd;
 264         struct osl_table *t = calloc(1, sizeof(*t));
 265         int i, ret = -ERRNO_TO_ERROR(ENOMEM), have_disk_storage_name_column = 0;
 266
 267         if (!t)
 268                 return ret;
 269         ret = -E_OSL_BAD_TABLE_DESC;
 270         if (!desc)
 271                 goto err;
 272         DEBUG_LOG("creating table structure for '%s' from table "
 273                 "description\n", desc->name);
 274         ret = -E_OSL_NO_COLUMN_DESC;
 275         if (!desc->column_descriptions)
 276                 goto err;
 277         ret = -E_OSL_NO_COLUMNS;
 278         if (!desc->num_columns)
 279                 goto err;
 280         ret = -ERRNO_TO_ERROR(ENOMEM);
 281         t->columns = calloc(desc->num_columns, sizeof(struct osl_column));
 282         if (!t->columns)
 283                 goto err;
 284         t->desc = desc;
 285         FOR_EACH_COLUMN(i, t->desc, cd) {
 286                 enum osl_storage_type st = cd->storage_type;
 287                 enum osl_storage_flags sf = cd->storage_flags;
 288                 struct osl_column *col = &t->columns[i];
 289
 290                 ret = -E_OSL_BAD_STORAGE_TYPE;
 291                 if (st != OSL_MAPPED_STORAGE && st != OSL_DISK_STORAGE
 292                                 && st != OSL_NO_STORAGE)
 293                         goto err;
 294                 ret = -E_OSL_BAD_STORAGE_FLAGS;
 295                 if (st == OSL_DISK_STORAGE && sf & OSL_RBTREE)
 296                         goto err;
 297                 ret = -E_OSL_BAD_STORAGE_SIZE;
 298                 if (sf & OSL_FIXED_SIZE && !cd->data_size)
 299                         goto err;
 300                 switch (st) {
 301                 case OSL_DISK_STORAGE:
 302                         t->num_disk_storage_columns++;
 303                         break;
 304                 case OSL_MAPPED_STORAGE:
 305                         t->num_mapped_columns++;
 306                         col->index_offset = t->row_index_size;
 307                         t->row_index_size += 8;
 308                         break;
 309                 case OSL_NO_STORAGE:
 310                         col->volatile_num = t->num_volatile_columns;
 311                         t->num_volatile_columns++;
 312                         break;
 313                 }
 314                 if (sf & OSL_RBTREE) {
 315                         col->rbtree_num = t->num_rbtrees;
 316                         t->num_rbtrees++;
 317                         if ((sf & OSL_UNIQUE) && (st == OSL_MAPPED_STORAGE)) {
 318                                 if (!have_disk_storage_name_column)
 319                                         t->disk_storage_name_column = i;
 320                                 have_disk_storage_name_column = 1;
 321                         }
 322                 }
 323         }
 324         ret = -E_OSL_NO_UNIQUE_RBTREE_COLUMN;
 325         if (t->num_disk_storage_columns && !have_disk_storage_name_column)
 326                 goto err;
 327         ret = -E_OSL_NO_RBTREE_COL;
 328         if (!t->num_rbtrees)
 329                 goto err;
 330         /* success */
 331         DEBUG_LOG("OK. Index entry size: %u\n", t->row_index_size);
 332         ret = init_column_descriptions(t);
 333         if (ret < 0)
 334                 goto err;
 335         *table_ptr = t;
 336         return 1;
 337 err:
 338         free(t->columns);
 339         free(t);
 340         return ret;
 341 }
 342
 343 /**
 344  * Read the table description from index header.
 345  *
 346  * \param map The memory mapping of the index file.
 347  * \param desc The values found in the index header are returned here.
 348  *
 349  * Read the index header, check for the paraslash magic string and the table version number.
 350  * Read all information stored in the index header into \a desc.
 351  *
 352  * \return Standard.
 353  *
 354  * \sa struct osl_table_description, osl_create_table.
 355  */
 356 int read_table_desc(struct osl_object *map, struct osl_table_description *desc)
 357 {
 358         char *buf = map->data;
 359         uint8_t version;
 360         uint16_t header_size;
 361         int ret, i;
 362         unsigned offset;
 363         struct osl_column_description *cd;
 364
 365         if (map->size < MIN_INDEX_HEADER_SIZE(1))
 366                 return -E_OSL_SHORT_TABLE;
 367         if (strncmp(buf + IDX_PARA_MAGIC, PARA_MAGIC, strlen(PARA_MAGIC)))
 368                 return -E_OSL_NO_MAGIC;
 369         version = read_u8(buf + IDX_VERSION);
 370         if (version < MIN_TABLE_VERSION || version > MAX_TABLE_VERSION)
 371                 return -E_OSL_VERSION_MISMATCH;
 372         desc->flags = read_u8(buf + IDX_TABLE_FLAGS);
 373         desc->num_columns = read_u16(buf + IDX_NUM_COLUMNS);
 374         INFO_LOG("%u columns\n", desc->num_columns);
 375         if (!desc->num_columns)
 376                 return -E_OSL_NO_COLUMNS;
 377         header_size = read_u16(buf + IDX_HEADER_SIZE);
 378         if (map->size < header_size)
 379                 return -E_OSL_BAD_SIZE;
 380         desc->column_descriptions = calloc(desc->num_columns,
 381                 sizeof(struct osl_column_description));
 382         if (!desc->column_descriptions)
 383                 return -ERRNO_TO_ERROR(ENOMEM);
 384         offset = IDX_COLUMN_DESCRIPTIONS;
 385         FOR_EACH_COLUMN(i, desc, cd) {
 386                 char *null_byte;
 387
 388                 ret = -E_OSL_SHORT_TABLE;
 389                 if (map->size < offset + MIN_IDX_COLUMN_DESCRIPTION_SIZE) {
 390                         ERROR_LOG("map size = %zu < %u = offset + min desc size\n",
 391                                 map->size, offset + MIN_IDX_COLUMN_DESCRIPTION_SIZE);
 392                         goto err;
 393                 }
 394                 cd->storage_type = read_u16(buf + offset + IDX_CD_STORAGE_TYPE);
 395                 cd->storage_flags = read_u16(buf + offset +
 396                         IDX_CD_STORAGE_FLAGS);
 397                 cd->data_size = read_u32(buf + offset + IDX_CD_DATA_SIZE);
 398                 null_byte = memchr(buf + offset + IDX_CD_NAME, '\0',
 399                         map->size - offset - IDX_CD_NAME);
 400                 ret = -E_OSL_INDEX_CORRUPTION;
 401                 if (!null_byte)
 402                         goto err;
 403                 ret = -ERRNO_TO_ERROR(ENOMEM);
 404                 cd->name = strdup(buf + offset + IDX_CD_NAME);
 405                 if (!cd->name)
 406                         goto err;
 407                 offset += index_column_description_size(cd->name);
 408         }
 409         if (offset != header_size) {
 410                 ret = -E_OSL_INDEX_CORRUPTION;
 411                 ERROR_LOG("real header size = %u != %u = stored header size\n",
 412                         offset, header_size);
 413                 goto err;
 414         }
 415         return 1;
 416 err:
 417         FOR_EACH_COLUMN(i, desc, cd)
 418                 free(cd->name);
 419         return ret;
 420 }
 421
 422 /*
 423  * check whether the table description given by \p t->desc matches the on-disk
 424  * table structure stored in the index of \a t.
 425  */
 426 static int compare_table_descriptions(struct osl_table *t)
 427 {
 428         int i, ret;
 429         struct osl_table_description desc;
 430         const struct osl_column_description *cd1, *cd2;
 431
 432         /* read the on-disk structure into desc */
 433         ret = read_table_desc(&t->index_map, &desc);
 434         if (ret < 0)
 435                 return ret;
 436         ret = -E_OSL_BAD_TABLE_FLAGS;
 437         if (desc.flags != t->desc->flags)
 438                 goto out;
 439         ret = -E_OSL_BAD_COLUMN_NUM;
 440         if (desc.num_columns > t->desc->num_columns)
 441                 goto out;
 442         if (desc.num_columns < t->desc->num_columns) {
 443                 struct osl_column_description *cd;
 444                 unsigned diff = t->desc->num_columns - desc.num_columns;
 445                 INFO_LOG("extending table by %u volatile columns\n", diff);
 446                 ret = -ERRNO_TO_ERROR(ENOMEM);
 447                 desc.column_descriptions = realloc(desc.column_descriptions,
 448                         t->desc->num_columns * sizeof(struct osl_column_description));
 449                 if (!desc.column_descriptions)
 450                         goto out;
 451                 for (i = desc.num_columns; i < t->desc->num_columns; i++) {
 452                         cd = get_column_description(&desc, i);
 453                         cd->storage_type = OSL_NO_STORAGE;
 454                         cd->name = NULL;
 455                 }
 456                 desc.num_columns += diff;
 457         }
 458         FOR_EACH_COLUMN(i, t->desc, cd1) {
 459                 cd2 = get_column_description(&desc, i);
 460                 ret = -E_OSL_BAD_STORAGE_TYPE;
 461                 if (cd1->storage_type != cd2->storage_type)
 462                         goto out;
 463                 if (cd1->storage_type == OSL_NO_STORAGE)
 464                         continue;
 465                 ret = -E_OSL_BAD_STORAGE_FLAGS;
 466                 if (cd1->storage_flags != cd2->storage_flags) {
 467                         ERROR_LOG("sf1 = %u != %u = sf2\n",
 468                                 cd1->storage_flags, cd2->storage_flags);
 469                         goto out;
 470                 }
 471                 ret = -E_OSL_BAD_DATA_SIZE;
 472                 if (cd1->storage_flags & OSL_FIXED_SIZE)
 473                         if (cd1->data_size != cd2->data_size)
 474                                 goto out;
 475                 ret = -E_OSL_BAD_COLUMN_NAME;
 476                 if (strcmp(cd1->name, cd2->name))
 477                         goto out;
 478         }
 479         INFO_LOG("table description of '%s' matches on-disk data, good\n",
 480                 t->desc->name);
 481         ret = 1;
 482 out:
 483         FOR_EACH_COLUMN(i, &desc, cd1)
 484                 free(cd1->name);
 485         free(desc.column_descriptions);
 486         return ret;
 487 }
 488
 489 static int create_table_index(struct osl_table *t)
 490 {
 491         char *buf, *filename;
 492         int i, ret;
 493         size_t size = t->index_header_size;
 494         const struct osl_column_description *cd;
 495         unsigned offset;
 496
 497         INFO_LOG("creating %zu byte index for table %s\n", size,
 498                 t->desc->name);
 499         buf = calloc(1, size);
 500         if (!buf)
 501                 return -ERRNO_TO_ERROR(ENOMEM);
 502         sprintf(buf + IDX_PARA_MAGIC, "%s", PARA_MAGIC);
 503         write_u8(buf + IDX_TABLE_FLAGS, t->desc->flags);
 504         write_u8(buf + IDX_DIRTY_FLAG, 0);
 505         write_u8(buf + IDX_VERSION, CURRENT_TABLE_VERSION);
 506         write_u16(buf + IDX_NUM_COLUMNS, t->num_mapped_columns + t->num_disk_storage_columns);
 507         write_u16(buf + IDX_HEADER_SIZE, t->index_header_size);
 508         offset = IDX_COLUMN_DESCRIPTIONS;
 509         FOR_EACH_COLUMN(i, t->desc, cd) {
 510                 /* no need to store info about volatile storage */
 511                 if (cd->storage_type == OSL_NO_STORAGE)
 512                         continue;
 513                 write_u16(buf + offset + IDX_CD_STORAGE_TYPE,
 514                         cd->storage_type);
 515                 write_u16(buf + offset + IDX_CD_STORAGE_FLAGS,
 516                         cd->storage_flags);
 517                 if (cd->storage_flags & OSL_FIXED_SIZE)
 518                         write_u32(buf + offset + IDX_CD_DATA_SIZE,
 519                                 cd->data_size);
 520                 strcpy(buf + offset + IDX_CD_NAME, cd->name);
 521                 offset += index_column_description_size(cd->name);
 522         }
 523         assert(offset = size);
 524         filename = index_filename(t->desc);
 525         if (filename)
 526                 ret = write_file(filename, buf, size);
 527         else
 528                 ret = -ERRNO_TO_ERROR(ENOMEM);
 529         free(buf);
 530         free(filename);
 531         return ret;
 532 }
 533
 534 __export int osl_create_table(const struct osl_table_description *desc)
 535 {
 536         const struct osl_column_description *cd;
 537         char *table_dir = NULL, *filename;
 538         struct osl_table *t;
 539         int i, ret = init_table_structure(desc, &t);
 540
 541         if (ret < 0)
 542                 return ret;
 543         INFO_LOG("creating %s\n", desc->name);
 544         FOR_EACH_COLUMN(i, t->desc, cd) {
 545                 if (cd->storage_type == OSL_NO_STORAGE)
 546                         continue;
 547                 if (!table_dir) {
 548                         ret = osl_mkdir(desc->dir, 0777);
 549                         if (ret < 0 && !is_errno(-ret, EEXIST))
 550                                 goto out;
 551                         table_dir = make_message("%s/%s", desc->dir,
 552                                 desc->name);
 553                         ret = -ERRNO_TO_ERROR(ENOMEM);
 554                         if (!table_dir)
 555                                 goto out;
 556                         ret = osl_mkdir(table_dir, 0777);
 557                         if (ret < 0)
 558                                 goto out;
 559                 }
 560                 ret = -ERRNO_TO_ERROR(ENOMEM);
 561                 filename = column_filename(t, i);
 562                 if (!filename)
 563                         goto out;
 564                 INFO_LOG("filename: %s\n", filename);
 565                 if (cd->storage_type == OSL_MAPPED_STORAGE) {
 566                         ret = osl_open(filename, O_RDWR | O_CREAT | O_EXCL,
 567                                 0644);
 568                         free(filename);
 569                         if (ret < 0)
 570                                 goto out;
 571                         close(ret);
 572                         continue;
 573                 }
 574                 /* DISK STORAGE */
 575                 ret = osl_mkdir(filename, 0777);
 576                 free(filename);
 577                 if (ret < 0)
 578                         goto out;
 579         }
 580         if (t->num_mapped_columns) {
 581                 ret = create_table_index(t);
 582                 if (ret < 0)
 583                         goto out;
 584         }
 585         ret = 1;
 586 out:
 587         free(table_dir);
 588         free(t->columns);
 589         free(t);
 590         return ret;
 591 }
 592
 593 static int table_is_dirty(struct osl_table *t)
 594 {
 595         char *buf = (char *)t->index_map.data + IDX_DIRTY_FLAG;
 596         uint8_t dirty = read_u8(buf) & 0x1;
 597         return !!dirty;
 598 }
 599
 600 static void mark_table_dirty(struct osl_table *t)
 601 {
 602         char *buf = (char *)t->index_map.data + IDX_DIRTY_FLAG;
 603         write_u8(buf, read_u8(buf) | 1);
 604 }
 605
 606 static void mark_table_clean(struct osl_table *t)
 607 {
 608         char *buf = (char *)t->index_map.data + IDX_DIRTY_FLAG;
 609         write_u8(buf, read_u8(buf) & 0xfe);
 610 }
 611
 612 static void unmap_column(struct osl_table *t, unsigned col_num)
 613 {
 614         struct osl_object map = t->columns[col_num].data_map;
 615         int ret;
 616         if (!map.data)
 617                 return;
 618         ret = osl_munmap(map.data, map.size);
 619         assert(ret > 0);
 620         map.data = NULL;
 621 }
 622
 623 /**
 624  * Unmap all mapped files of an osl table.
 625  *
 626  * \param t Pointer to a mapped table.
 627  * \param flags Options for unmapping.
 628  *
 629  * \return Positive on success, negative on errors.
 630  *
 631  * \sa map_table(), enum osl_close_flags, osl_munmap().
 632  */
 633 int unmap_table(struct osl_table *t, enum osl_close_flags flags)
 634 {
 635         unsigned i;
 636         const struct osl_column_description *cd;
 637         int ret;
 638
 639         if (!t->num_mapped_columns) /* can this ever happen? */
 640                 return 1;
 641         INFO_LOG("unmapping table '%s'\n", t->desc->name);
 642         if (!t->index_map.data)
 643                 return -E_OSL_NOT_MAPPED;
 644         if (flags & OSL_MARK_CLEAN)
 645                 mark_table_clean(t);
 646         ret = osl_munmap(t->index_map.data, t->index_map.size);
 647         if (ret < 0)
 648                 return ret;
 649         t->index_map.data = NULL;
 650         if (!t->num_rows)
 651                 return 1;
 652         FOR_EACH_MAPPED_COLUMN(i, t, cd)
 653                 unmap_column(t, i);
 654         return 1;
 655 }
 656
 657 static int map_column(struct osl_table *t, unsigned col_num)
 658 {
 659         struct stat statbuf;
 660         char *filename = column_filename(t, col_num);
 661         int ret;
 662
 663         if (!filename)
 664                 return -ERRNO_TO_ERROR(ENOMEM);
 665         ret = osl_stat(filename, &statbuf);
 666         if (ret < 0) {
 667                 free(filename);
 668                 return ret;
 669         }
 670         if (!(S_IFREG & statbuf.st_mode)) {
 671                 free(filename);
 672                 return ret;
 673         }
 674         ret = mmap_full_file(filename, O_RDWR,
 675                 &t->columns[col_num].data_map.data,
 676                 &t->columns[col_num].data_map.size,
 677                 NULL);
 678         free(filename);
 679         return ret;
 680 }
 681
 682 /**
 683  * Map the index file and all columns of type \p OSL_MAPPED_STORAGE into memory.
 684  *
 685  * \param t Pointer to an initialized table structure.
 686  * \param flags Mapping options.
 687  *
 688  * \return Negative return value on errors; on success the number of rows
 689  * (including invalid rows) is returned.
 690  *
 691  * \sa unmap_table(), enum map_table_flags, osl_open_table(), mmap(2).
 692  */
 693 int map_table(struct osl_table *t, enum map_table_flags flags)
 694 {
 695         char *filename;
 696         const struct osl_column_description *cd;
 697         int i = 0, ret, num_rows = 0;
 698
 699         if (!t->num_mapped_columns)
 700                 return 0;
 701         if (t->index_map.data)
 702                 return -E_OSL_ALREADY_MAPPED;
 703         filename = index_filename(t->desc);
 704         if (!filename)
 705                 return -ERRNO_TO_ERROR(ENOMEM);
 706         INFO_LOG("mapping table '%s' (index: %s)\n", t->desc->name, filename);
 707         ret = mmap_full_file(filename, flags & MAP_TBL_FL_MAP_RDONLY?
 708                 O_RDONLY : O_RDWR, &t->index_map.data, &t->index_map.size, NULL);
 709         free(filename);
 710         if (ret < 0)
 711                 return ret;
 712         if (flags & MAP_TBL_FL_VERIFY_INDEX) {
 713                 ret = compare_table_descriptions(t);
 714                 if (ret < 0)
 715                         goto err;
 716         }
 717         ret = -E_OSL_BUSY;
 718         if (!(flags & MAP_TBL_FL_IGNORE_DIRTY)) {
 719                 if (table_is_dirty(t)) {
 720                         ERROR_LOG("%s is dirty\n", t->desc->name);
 721                         goto err;
 722                 }
 723         }
 724         mark_table_dirty(t);
 725         num_rows = table_num_rows(t);
 726         if (!num_rows)
 727                 return num_rows;
 728         /* map data files */
 729         FOR_EACH_MAPPED_COLUMN(i, t, cd) {
 730                 ret = map_column(t, i);
 731                 if (ret < 0)
 732                         goto err;
 733         }
 734         return num_rows;
 735 err:    /* unmap what is already mapped */
 736         for (i--; i >= 0; i--) {
 737                 struct osl_object map = t->columns[i].data_map;
 738                 osl_munmap(map.data, map.size);
 739                 map.data = NULL;
 740         }
 741         osl_munmap(t->index_map.data, t->index_map.size);
 742         t->index_map.data = NULL;
 743         return ret;
 744 }
 745
 746 /**
 747  * Retrieve a mapped object by row and column number.
 748  *
 749  * \param t Pointer to an open osl table.
 750  * \param col_num Number of the mapped column containing the object to retrieve.
 751  * \param row_num Number of the row containing the object to retrieve.
 752  * \param obj The result is returned here.
 753  *
 754  * It is considered an error if \a col_num does not refer to a column
 755  * of storage type \p OSL_MAPPED_STORAGE.
 756  *
 757  * \return Standard.
 758  *
 759  * \sa osl_storage_type.
 760  */
 761 int get_mapped_object(const struct osl_table *t, unsigned col_num,
 762         uint32_t row_num, struct osl_object *obj)
 763 {
 764         struct osl_column *col = &t->columns[col_num];
 765         uint32_t offset;
 766         char *header;
 767         char *cell_index;
 768         int ret;
 769
 770         if (t->num_rows <= row_num)
 771                 return -E_OSL_BAD_ROW_NUM;
 772         ret = get_cell_index(t, row_num, col_num, &cell_index);
 773         if (ret < 0)
 774                 return ret;
 775         offset = read_u32(cell_index);
 776         obj->size = read_u32(cell_index + 4) - 1;
 777         header = col->data_map.data + offset;
 778         obj->data = header + 1;
 779         if (read_u8(header) == 0xff) {
 780                 ERROR_LOG("col %u, size %zu, offset %u\n", col_num,
 781                         obj->size, offset);
 782                 return -E_OSL_INVALID_OBJECT;
 783         }
 784         return 1;
 785 }
 786
 787 static int search_rbtree(const struct osl_object *obj,
 788                 const struct osl_table *t, unsigned col_num,
 789                 struct rb_node **result, struct rb_node ***rb_link)
 790 {
 791         struct osl_column *col = &t->columns[col_num];
 792         struct rb_node **new = &col->rbtree.rb_node, *parent = NULL;
 793         const struct osl_column_description *cd =
 794                 get_column_description(t->desc, col_num);
 795         enum osl_storage_type st = cd->storage_type;
 796         while (*new) {
 797                 struct osl_row *this_row = get_row_pointer(*new,
 798                         col->rbtree_num);
 799                 int ret;
 800                 struct osl_object this_obj;
 801                 parent = *new;
 802                 if (st == OSL_MAPPED_STORAGE) {
 803                         ret = get_mapped_object(t, col_num, this_row->num,
 804                                 &this_obj);
 805                         if (ret < 0)
 806                                 return ret;
 807                 } else
 808                         this_obj = this_row->volatile_objects[col->volatile_num];
 809                 ret = cd->compare_function(obj, &this_obj);
 810                 if (!ret) {
 811                         if (result)
 812                                 *result = get_rb_node_pointer(this_row,
 813                                         col->rbtree_num);
 814                         return 1;
 815                 }
 816                 if (ret < 0)
 817                         new = &((*new)->rb_left);
 818                 else
 819                         new = &((*new)->rb_right);
 820         }
 821         if (result)
 822                 *result = parent;
 823         if (rb_link)
 824                 *rb_link = new;
 825         return -E_OSL_RB_KEY_NOT_FOUND;
 826 }
 827
 828 static int insert_rbtree(struct osl_table *t, unsigned col_num,
 829         const struct osl_row *row, const struct osl_object *obj)
 830 {
 831         struct rb_node *parent, **rb_link;
 832         unsigned rbtree_num;
 833         struct rb_node *n;
 834         int ret = search_rbtree(obj, t, col_num, &parent, &rb_link);
 835
 836         if (ret > 0)
 837                 return -E_OSL_RB_KEY_EXISTS;
 838         rbtree_num = t->columns[col_num].rbtree_num;
 839         n = get_rb_node_pointer(row, rbtree_num);
 840         rb_link_node(n, parent, rb_link);
 841         rb_insert_color(n, &t->columns[col_num].rbtree);
 842         return 1;
 843 }
 844
 845 static void remove_rb_node(struct osl_table *t, unsigned col_num,
 846                 const struct osl_row *row)
 847 {
 848         struct osl_column *col = &t->columns[col_num];
 849         const struct osl_column_description *cd =
 850                 get_column_description(t->desc, col_num);
 851         enum osl_storage_flags sf = cd->storage_flags;
 852         struct rb_node *victim, *splice_out_node, *tmp;
 853         if (!(sf & OSL_RBTREE))
 854                 return;
 855         /*
 856          * Which node is removed/spliced out actually depends on how many
 857          * children the victim node has: If it has no children, it gets
 858          * deleted. If it has one child, it gets spliced out. If it has two
 859          * children, its successor (which has at most a right child) gets
 860          * spliced out.
 861          */
 862         victim = get_rb_node_pointer(row, col->rbtree_num);
 863         if (victim->rb_left && victim->rb_right)
 864                 splice_out_node = rb_next(victim);
 865         else
 866                 splice_out_node = victim;
 867         /* Go up to the root and decrement the size of each node in the path. */
 868         for (tmp = splice_out_node; tmp; tmp = rb_parent(tmp))
 869                 tmp->size--;
 870         rb_erase(victim, &col->rbtree);
 871 }
 872
 873 static int add_row_to_rbtrees(struct osl_table *t, uint32_t row_num,
 874                 struct osl_object *volatile_objs, struct osl_row **row_ptr)
 875 {
 876         unsigned i;
 877         int ret;
 878         struct osl_row *row = allocate_row(t->num_rbtrees);
 879         const struct osl_column_description *cd;
 880
 881         if (!row)
 882                 return -ERRNO_TO_ERROR(ENOMEM);
 883         row->num = row_num;
 884         row->volatile_objects = volatile_objs;
 885         FOR_EACH_RBTREE_COLUMN(i, t, cd) {
 886                 if (cd->storage_type == OSL_MAPPED_STORAGE) {
 887                         struct osl_object obj;
 888                         ret = get_mapped_object(t, i, row_num, &obj);
 889                         if (ret < 0)
 890                                 goto err;
 891                         ret = insert_rbtree(t, i, row, &obj);
 892                 } else { /* volatile */
 893                         const struct osl_object *obj
 894                                 = volatile_objs + t->columns[i].volatile_num;
 895                         ret = insert_rbtree(t, i, row, obj);
 896                 }
 897                 if (ret < 0)
 898                         goto err;
 899         }
 900         if (row_ptr)
 901                 *row_ptr = row;
 902         return 1;
 903 err: /* rollback changes, i.e. remove added entries from rbtrees */
 904         while (i)
 905                 remove_rb_node(t, i--, row);
 906         free(row);
 907         return ret;
 908 }
 909
 910 static void free_volatile_objects(const struct osl_table *t,
 911                 enum osl_close_flags flags)
 912 {
 913         int i, j;
 914         struct rb_node *n;
 915         struct osl_column *rb_col;
 916         const struct osl_column_description *cd;
 917
 918         if (!t->num_volatile_columns)
 919                 return;
 920         /* find the first rbtree column (any will do) */
 921         FOR_EACH_RBTREE_COLUMN(i, t, cd)
 922                 break;
 923         rb_col = t->columns + i;
 924         /* walk that rbtree and free all volatile objects */
 925         for (n = rb_first(&rb_col->rbtree); n; n = rb_next(n)) {
 926                 struct osl_row *r = get_row_pointer(n, rb_col->rbtree_num);
 927                 if (flags & OSL_FREE_VOLATILE)
 928                         FOR_EACH_VOLATILE_COLUMN(j, t, cd) {
 929                                 if (cd->storage_flags & OSL_DONT_FREE)
 930                                         continue;
 931                                 free(r->volatile_objects[
 932                                         t->columns[j].volatile_num].data);
 933                         }
 934 //                      for (j = 0; j < t->num_volatile_columns; j++)
 935 //                              free(r->volatile_objects[j].data);
 936                 free(r->volatile_objects);
 937         }
 938 }
 939
 940 /**
 941  * Erase all rbtree nodes and free resources.
 942  *
 943  * \param t Pointer to an open osl table.
 944  *
 945  * This function is called by osl_close_table().
 946  */
 947 void clear_rbtrees(struct osl_table *t)
 948 {
 949         const struct osl_column_description *cd;
 950         unsigned i, rbtrees_cleared = 0;
 951
 952         FOR_EACH_RBTREE_COLUMN(i, t, cd) {
 953                 struct osl_column *col = &t->columns[i];
 954                 struct rb_node *n;
 955                 rbtrees_cleared++;
 956                 for (n = rb_first(&col->rbtree); n;) {
 957                         struct osl_row *r;
 958                         rb_erase(n, &col->rbtree);
 959                         if (rbtrees_cleared == t->num_rbtrees) {
 960                                 r = get_row_pointer(n, col->rbtree_num);
 961                                 n = rb_next(n);
 962                                 free(r);
 963                         } else
 964                                 n = rb_next(n);
 965                 }
 966         }
 967
 968 }
 969
 970 __export int osl_close_table(struct osl_table *t, enum osl_close_flags flags)
 971 {
 972         int ret;
 973
 974         if (!t)
 975                 return -E_OSL_BAD_TABLE;
 976         NOTICE_LOG("closing table %s\n", t->desc->name);
 977         free_volatile_objects(t, flags);
 978         clear_rbtrees(t);
 979         ret = unmap_table(t, flags);
 980         if (ret < 0)
 981                 ERROR_LOG("unmap_table failed: %d\n", ret);
 982         free(t->columns);
 983         free(t);
 984         return ret;
 985 }
 986
 987 /**
 988  * Find out whether the given row number corresponds to an invalid row.
 989  *
 990  * \param t Pointer to the osl table.
 991  * \param row_num The number of the row in question.
 992  *
 993  * By definition, a row is considered invalid if all its index entries
 994  * are invalid.
 995  *
 996  * \return Positive if \a row_num corresponds to an invalid row,
 997  * zero if it corresponds to a valid row, negative on errors.
 998  */
 999 int row_is_invalid(struct osl_table *t, uint32_t row_num)
1000 {
1001         char *row_index;
1002         int i, ret = get_row_index(t, row_num, &row_index);
1003
1004         if (ret < 0)
1005                 return ret;
1006         for (i = 0; i < t->row_index_size; i++) {
1007                 if ((unsigned char)row_index[i] != 0xff)
1008                         return 0;
1009         }
1010         INFO_LOG("row %d is invalid\n", row_num);
1011         return 1;
1012 }
1013
1014 /**
1015  * Invalidate a row of an osl table.
1016  *
1017  * \param t Pointer to an open osl table.
1018  * \param row_num Number of the row to mark as invalid.
1019  *
1020  * This function marks each mapped object in the index entry of \a row as
1021  * invalid.
1022  *
1023  * \return Standard.
1024  */
1025 int mark_row_invalid(struct osl_table *t, uint32_t row_num)
1026 {
1027         char *row_index;
1028         int ret = get_row_index(t, row_num, &row_index);
1029
1030         if (ret < 0)
1031                 return ret;
1032         INFO_LOG("marking row %d as invalid\n", row_num);
1033         memset(row_index, 0xff, t->row_index_size);
1034         return 1;
1035 }
1036
1037 /**
1038  * Initialize all rbtrees and compute number of invalid rows.
1039  *
1040  * \param t The table containing the rbtrees to be initialized.
1041  *
1042  * \return Standard.
1043  */
1044 int init_rbtrees(struct osl_table *t)
1045 {
1046         int i, ret;
1047         const struct osl_column_description *cd;
1048
1049         /* create rbtrees */
1050         FOR_EACH_RBTREE_COLUMN(i, t, cd)
1051                 t->columns[i].rbtree = RB_ROOT;
1052         /* add valid rows to rbtrees */
1053         t->num_invalid_rows = 0;
1054         for (i = 0; i < t->num_rows; i++) {
1055                 ret = row_is_invalid(t, i);
1056                 if (ret < 0)
1057                         return ret;
1058                 if (ret) {
1059                         t->num_invalid_rows++;
1060                         continue;
1061                 }
1062                 ret = add_row_to_rbtrees(t, i, NULL, NULL);
1063                 if (ret < 0)
1064                         return ret;
1065         }
1066         return 1;
1067 }
1068
1069 __export int osl_open_table(const struct osl_table_description *table_desc,
1070                 struct osl_table **result)
1071 {
1072         int i, ret;
1073         struct osl_table *t;
1074         const struct osl_column_description *cd;
1075
1076         NOTICE_LOG("opening table %s\n", table_desc->name);
1077         ret = init_table_structure(table_desc, &t);
1078         if (ret < 0)
1079                 return ret;
1080         FOR_EACH_DISK_STORAGE_COLUMN(i, t, cd) {
1081                 struct stat statbuf;
1082                 char *dirname = column_filename(t, i);
1083
1084                 ret = -ERRNO_TO_ERROR(ENOMEM);
1085                 if (!dirname)
1086                         goto err;
1087                 /* check if directory exists */
1088                 ret = stat(dirname, &statbuf);
1089                 free(dirname);
1090                 if (ret < 0) {
1091                         ret = -ERRNO_TO_ERROR(errno);
1092                         goto err;
1093                 }
1094                 ret = -ERRNO_TO_ERROR(ENOTDIR);
1095                 if (!S_ISDIR(statbuf.st_mode))
1096                         goto err;
1097         }
1098         ret = map_table(t, MAP_TBL_FL_VERIFY_INDEX);
1099         if (ret < 0)
1100                 goto err;
1101         t->num_rows = ret;
1102         DEBUG_LOG("num rows: %d\n", t->num_rows);
1103         ret = init_rbtrees(t);
1104         if (ret < 0) {
1105                 osl_close_table(t, OSL_MARK_CLEAN); /* ignore further errors */
1106                 return ret;
1107         }
1108         *result = t;
1109         return 1;
1110 err:
1111         free(t->columns);
1112         free(t);
1113         return ret;
1114 }
1115
1116 static int create_disk_storage_object_dir(const struct osl_table *t,
1117                 unsigned col_num, const char *ds_name)
1118 {
1119         char *dirname;
1120         int ret;
1121
1122         if (!(t->desc->flags & OSL_LARGE_TABLE))
1123                 return 1;
1124         dirname = disk_storage_dirname(t, col_num, ds_name);
1125         if (!dirname)
1126                 return -ERRNO_TO_ERROR(ENOMEM);
1127         ret = osl_mkdir(dirname, 0777);
1128         free(dirname);
1129         if (ret < 0 && !is_errno(-ret, EEXIST))
1130                 return ret;
1131         return 1;
1132 }
1133
1134 static int write_disk_storage_file(const struct osl_table *t, unsigned col_num,
1135         const struct osl_object *obj, const char *ds_name)
1136 {
1137         int ret;
1138         char *filename;
1139
1140         ret = create_disk_storage_object_dir(t, col_num, ds_name);
1141         if (ret < 0)
1142                 return ret;
1143         filename = disk_storage_path(t, col_num, ds_name);
1144         if (!filename)
1145                 return -ERRNO_TO_ERROR(ENOMEM);
1146         ret = write_file(filename, obj->data, obj->size);
1147         free(filename);
1148         return ret;
1149 }
1150
1151 static int append_map_file(const struct osl_table *t, unsigned col_num,
1152         const struct osl_object *obj, uint32_t *new_size)
1153 {
1154         char *filename = column_filename(t, col_num);
1155         int ret;
1156         char header = 0; /* zero means valid object */
1157
1158         if (!filename)
1159                 return -ERRNO_TO_ERROR(ENOMEM);
1160         ret = append_file(filename, &header, 1, obj->data, obj->size,
1161                 new_size);
1162         free(filename);
1163         return ret;
1164 }
1165
1166 static int append_row_index(const struct osl_table *t, char *row_index)
1167 {
1168         char *filename;
1169         int ret;
1170
1171         if (!t->num_mapped_columns)
1172                 return 1;
1173         filename = index_filename(t->desc);
1174         if (!filename)
1175                 return -ERRNO_TO_ERROR(ENOMEM);
1176         ret = append_file(filename, NULL, 0, row_index,
1177                 t->row_index_size, NULL);
1178         free(filename);
1179         return ret;
1180 }
1181
1182 static int truncate_mapped_file(const struct osl_table *t, unsigned col_num,
1183                 off_t size)
1184 {
1185         int ret;
1186         char *filename = column_filename(t, col_num);
1187
1188         if (!filename)
1189                 return -ERRNO_TO_ERROR(ENOMEM);
1190         ret = truncate_file(filename, size);
1191         free(filename);
1192         return ret;
1193 }
1194
1195 static int delete_disk_storage_file(const struct osl_table *t, unsigned col_num,
1196                 const char *ds_name)
1197 {
1198         char *dirname, *filename = disk_storage_path(t, col_num, ds_name);
1199         int ret, err;
1200
1201         if (!filename)
1202                 return -ERRNO_TO_ERROR(ENOMEM);
1203         ret = unlink(filename);
1204         err = errno;
1205         free(filename);
1206         if (ret < 0)
1207                 return -ERRNO_TO_ERROR(err);
1208         if (!(t->desc->flags & OSL_LARGE_TABLE))
1209                 return 1;
1210         dirname = disk_storage_dirname(t, col_num, ds_name);
1211         if (!dirname)
1212                 return -ERRNO_TO_ERROR(ENOMEM);
1213         rmdir(dirname);
1214         free(dirname);
1215         return 1;
1216 }
1217
1218 __export int osl_add_and_get_row(struct osl_table *t, struct osl_object *objects,
1219                 struct osl_row **row)
1220 {
1221         int i, ret;
1222         char *ds_name = NULL;
1223         struct rb_node **rb_parents = NULL, ***rb_links = NULL;
1224         char *new_row_index = NULL;
1225         struct osl_object *volatile_objs = NULL;
1226         const struct osl_column_description *cd;
1227
1228         if (!t)
1229                 return -E_OSL_BAD_TABLE;
1230         rb_parents = malloc(t->num_rbtrees * sizeof(struct rn_node*));
1231         if (!rb_parents)
1232                 return -ERRNO_TO_ERROR(ENOMEM);
1233         rb_links = malloc(t->num_rbtrees * sizeof(struct rn_node**));
1234         if (!rb_links) {
1235                 free(rb_parents);
1236                 return -ERRNO_TO_ERROR(ENOMEM);
1237         }
1238         if (t->num_mapped_columns) {
1239                 new_row_index = malloc(t->row_index_size);
1240                 if (!new_row_index) {
1241                         free(rb_links);
1242                         free(rb_parents);
1243                         return -ERRNO_TO_ERROR(ENOMEM);
1244                 }
1245         }
1246         /* pass 1: sanity checks */
1247 //      DEBUG_LOG("sanity tests: %p:%p\n", objects[0].data,
1248 //              objects[1].data);
1249         FOR_EACH_COLUMN(i, t->desc, cd) {
1250                 enum osl_storage_type st = cd->storage_type;
1251                 enum osl_storage_flags sf = cd->storage_flags;
1252
1253 //              ret = -E_OSL_NULL_OBJECT;
1254 //              if (!objects[i])
1255 //                      goto out;
1256                 if (st == OSL_DISK_STORAGE)
1257                         continue;
1258                 if (sf & OSL_RBTREE) {
1259                         unsigned rbtree_num = t->columns[i].rbtree_num;
1260                         ret = -E_OSL_RB_KEY_EXISTS;
1261 //                      DEBUG_LOG("checking whether %p exists\n",
1262 //                              objects[i].data);
1263                         if (search_rbtree(objects + i, t, i,
1264                                         &rb_parents[rbtree_num],
1265                                         &rb_links[rbtree_num]) > 0)
1266                                 goto out;
1267                 }
1268                 if (sf & OSL_FIXED_SIZE) {
1269 //                      DEBUG_LOG("fixed size. need: %zu, have: %d\n",
1270 //                              objects[i].size, cd->data_size);
1271                         ret = -E_OSL_BAD_DATA_SIZE;
1272                         if (objects[i].size != cd->data_size)
1273                                 goto out;
1274                 }
1275         }
1276         if (t->num_disk_storage_columns) {
1277                 ds_name = disk_storage_name_of_object(t,
1278                         &objects[t->disk_storage_name_column]);
1279                 ret = -ERRNO_TO_ERROR(ENOMEM);
1280                 if (!ds_name)
1281                         goto out;
1282         }
1283         ret = unmap_table(t, OSL_MARK_CLEAN);
1284         if (ret < 0)
1285                 goto out;
1286 //      DEBUG_LOG("sanity tests passed%s\n", "");
1287         /* pass 2: create data files, append map data */
1288         FOR_EACH_COLUMN(i, t->desc, cd) {
1289                 enum osl_storage_type st = cd->storage_type;
1290                 if (st == OSL_NO_STORAGE)
1291                         continue;
1292                 if (st == OSL_MAPPED_STORAGE) {
1293                         uint32_t new_size;
1294                         struct osl_column *col = &t->columns[i];
1295 //                      DEBUG_LOG("appending object of size %zu\n",
1296 //                              objects[i].size);
1297                         ret = append_map_file(t, i, objects + i, &new_size);
1298                         if (ret < 0)
1299                                 goto rollback;
1300                         update_cell_index(new_row_index, col, new_size,
1301                                 objects[i].size);
1302                         continue;
1303                 }
1304                 /* DISK_STORAGE */
1305                 ret = write_disk_storage_file(t, i, objects + i, ds_name);
1306                 if (ret < 0)
1307                         goto rollback;
1308         }
1309         ret = append_row_index(t, new_row_index);
1310         if (ret < 0)
1311                 goto rollback;
1312         ret = map_table(t, MAP_TBL_FL_VERIFY_INDEX);
1313         if (ret < 0) { /* truncate index and rollback changes */
1314                 char *filename = index_filename(t->desc);
1315                 if (filename)
1316                         truncate_file(filename, t->row_index_size);
1317                 free(filename);
1318                 goto rollback;
1319         }
1320         /* pass 3: add entry to rbtrees */
1321         if (t->num_volatile_columns) {
1322                 ret = -ERRNO_TO_ERROR(ENOMEM);
1323                 volatile_objs = calloc(t->num_volatile_columns,
1324                         sizeof(struct osl_object));
1325                 if (!volatile_objs)
1326                         goto out;
1327                 FOR_EACH_VOLATILE_COLUMN(i, t, cd)
1328                         volatile_objs[t->columns[i].volatile_num] = objects[i];
1329         }
1330         t->num_rows++;
1331 //      DEBUG_LOG("adding new entry as row #%d\n", t->num_rows - 1);
1332         ret = add_row_to_rbtrees(t, t->num_rows - 1, volatile_objs, row);
1333         if (ret < 0)
1334                 goto out;
1335 //      DEBUG_LOG("added new entry as row #%d\n", t->num_rows - 1);
1336         ret = 1;
1337         goto out;
1338 rollback: /* rollback all changes made, ignore further errors */
1339         for (i--; i >= 0; i--) {
1340                 cd = get_column_description(t->desc, i);
1341                 enum osl_storage_type st = cd->storage_type;
1342                 if (st == OSL_NO_STORAGE)
1343                         continue;
1344
1345                 if (st == OSL_MAPPED_STORAGE)
1346                         truncate_mapped_file(t, i, objects[i].size);
1347                 else /* disk storage */
1348                         delete_disk_storage_file(t, i, ds_name);
1349         }
1350         /* ignore error and return previous error value */
1351         map_table(t, MAP_TBL_FL_VERIFY_INDEX);
1352 out:
1353         free(new_row_index);
1354         free(ds_name);
1355         free(rb_parents);
1356         free(rb_links);
1357         return ret;
1358 }
1359
1360 __export int osl_add_row(struct osl_table *t, struct osl_object *objects)
1361 {
1362         return osl_add_and_get_row(t, objects, NULL);
1363 }
1364
1365 __export int osl_get_object(const struct osl_table *t, const struct osl_row *r,
1366         unsigned col_num, struct osl_object *object)
1367 {
1368         const struct osl_column_description *cd;
1369
1370         if (!t)
1371                 return -E_OSL_BAD_TABLE;
1372         cd = get_column_description(t->desc, col_num);
1373         /* col must not be disk storage */
1374         if (cd->storage_type == OSL_DISK_STORAGE)
1375                 return -E_OSL_BAD_STORAGE_TYPE;
1376         if (cd->storage_type == OSL_MAPPED_STORAGE)
1377                 return get_mapped_object(t, col_num, r->num, object);
1378         /* volatile */
1379         *object = r->volatile_objects[t->columns[col_num].volatile_num];
1380         return 1;
1381 }
1382
1383 static int mark_mapped_object_invalid(const struct osl_table *t,
1384                 uint32_t row_num, unsigned col_num)
1385 {
1386         struct osl_object obj;
1387         char *p;
1388         int ret = get_mapped_object(t, col_num, row_num, &obj);
1389
1390         if (ret < 0)
1391                 return ret;
1392         p = obj.data;
1393         p--;
1394         *p = 0xff;
1395         return 1;
1396 }
1397
1398 __export int osl_del_row(struct osl_table *t, struct osl_row *row)
1399 {
1400         struct osl_row *r = row;
1401         int i, ret;
1402         const struct osl_column_description *cd;
1403
1404         if (!t)
1405                 return -E_OSL_BAD_TABLE;
1406         INFO_LOG("deleting row %p\n", row);
1407
1408         if (t->num_disk_storage_columns) {
1409                 char *ds_name;
1410                 ret = disk_storage_name_of_row(t, r, &ds_name);
1411                 if (ret < 0)
1412                         goto out;
1413                 FOR_EACH_DISK_STORAGE_COLUMN(i, t, cd)
1414                         delete_disk_storage_file(t, i, ds_name);
1415                 free(ds_name);
1416         }
1417         FOR_EACH_COLUMN(i, t->desc, cd) {
1418                 struct osl_column *col = t->columns + i;
1419                 enum osl_storage_type st = cd->storage_type;
1420                 remove_rb_node(t, i, r);
1421                 if (st == OSL_MAPPED_STORAGE) {
1422                         mark_mapped_object_invalid(t, r->num, i);
1423                         continue;
1424                 }
1425                 if (st == OSL_NO_STORAGE && !(cd->storage_flags & OSL_DONT_FREE))
1426                         free(r->volatile_objects[col->volatile_num].data);
1427         }
1428         if (t->num_mapped_columns) {
1429                 ret = mark_row_invalid(t, r->num);
1430                 if (ret < 0)
1431                         goto out;
1432                 t->num_invalid_rows++;
1433         } else
1434                 t->num_rows--;
1435         ret = 1;
1436 out:
1437         free(r->volatile_objects);
1438         free(r);
1439         return ret;
1440 }
1441
1442 /* test if column has an rbtree */
1443 static int check_rbtree_col(const struct osl_table *t, unsigned col_num,
1444                 struct osl_column **col)
1445 {
1446         if (!t)
1447                 return -E_OSL_BAD_TABLE;
1448         if (!(get_column_description(t->desc, col_num)->storage_flags & OSL_RBTREE))
1449                 return -E_OSL_BAD_STORAGE_FLAGS;
1450         *col = t->columns + col_num;
1451         return 1;
1452 }
1453
1454 __export int osl_get_row(const struct osl_table *t, unsigned col_num,
1455                 const struct osl_object *obj, struct osl_row **result)
1456 {
1457         int ret;
1458         struct rb_node *node;
1459         struct osl_row *row;
1460         struct osl_column *col;
1461
1462         *result = NULL;
1463         ret = check_rbtree_col(t, col_num, &col);
1464         if (ret < 0)
1465                 return ret;
1466         ret = search_rbtree(obj, t, col_num, &node, NULL);
1467         if (ret < 0)
1468                 return ret;
1469         row = get_row_pointer(node, t->columns[col_num].rbtree_num);
1470         *result = row;
1471         return 1;
1472 }
1473
1474 static int rbtree_loop(struct osl_column *col, void *private_data,
1475                 osl_rbtree_loop_func *func)
1476 {
1477         struct rb_node *n, *tmp;
1478
1479         /* this for-loop is safe against removal of an entry */
1480         for (n = rb_first(&col->rbtree), tmp = n? rb_next(n) : NULL;
1481                         n;
1482                         n = tmp, tmp = tmp? rb_next(tmp) : NULL) {
1483                 struct osl_row *r = get_row_pointer(n, col->rbtree_num);
1484                 if (func(r, private_data) < 0)
1485                         return -E_OSL_LOOP;
1486         }
1487         return 1;
1488 }
1489
1490 static int rbtree_loop_reverse(struct osl_column *col, void *private_data,
1491                 osl_rbtree_loop_func *func)
1492 {
1493         struct rb_node *n, *tmp;
1494
1495         /* safe against removal of an entry */
1496         for (n = rb_last(&col->rbtree), tmp = n? rb_prev(n) : NULL;
1497                         n;
1498                         n = tmp, tmp = tmp? rb_prev(tmp) : NULL) {
1499                 struct osl_row *r = get_row_pointer(n, col->rbtree_num);
1500                 if (func(r, private_data) < 0)
1501                         return -E_OSL_LOOP;
1502         }
1503         return 1;
1504 }
1505
1506 __export int osl_rbtree_loop(const struct osl_table *t, unsigned col_num,
1507         void *private_data, osl_rbtree_loop_func *func)
1508 {
1509         struct osl_column *col;
1510
1511         int ret = check_rbtree_col(t, col_num, &col);
1512         if (ret < 0)
1513                 return ret;
1514         return rbtree_loop(col, private_data, func);
1515 }
1516
1517 __export int osl_rbtree_loop_reverse(const struct osl_table *t, unsigned col_num,
1518         void *private_data, osl_rbtree_loop_func *func)
1519 {
1520         struct osl_column *col;
1521
1522         int ret = check_rbtree_col(t, col_num, &col);
1523         if (ret < 0)
1524                 return ret;
1525         return rbtree_loop_reverse(col, private_data, func);
1526 }
1527
1528 /* TODO: Rollback changes on errors */
1529 static int rename_disk_storage_objects(struct osl_table *t,
1530                 struct osl_object *old_obj, struct osl_object *new_obj)
1531 {
1532         int i, ret;
1533         const struct osl_column_description *cd;
1534         char *old_ds_name, *new_ds_name;
1535
1536         if (!t->num_disk_storage_columns)
1537                 return 1; /* nothing to do */
1538         if (old_obj->size == new_obj->size && !memcmp(new_obj->data,
1539                         old_obj->data, new_obj->size))
1540                 return 1; /* object did not change */
1541         old_ds_name = disk_storage_name_of_object(t, old_obj);
1542         new_ds_name = disk_storage_name_of_object(t, new_obj);
1543         ret = -ERRNO_TO_ERROR(ENOMEM);
1544         if (!old_ds_name || ! new_ds_name)
1545                 goto out;
1546
1547         FOR_EACH_DISK_STORAGE_COLUMN(i, t, cd) {
1548                 char *old_filename, *new_filename;
1549                 ret = create_disk_storage_object_dir(t, i, new_ds_name);
1550                 if (ret < 0)
1551                         goto out;
1552                 old_filename = disk_storage_path(t, i, old_ds_name);
1553                 new_filename = disk_storage_path(t, i, new_ds_name);
1554                 if (!old_filename || !new_filename)
1555                         ret = -ERRNO_TO_ERROR(ENOMEM);
1556                 else
1557                         ret = osl_rename(old_filename, new_filename);
1558                 free(old_filename);
1559                 free(new_filename);
1560                 if (ret < 0)
1561                         goto out;
1562         }
1563         ret = 1;
1564 out:
1565         free(old_ds_name);
1566         free(new_ds_name);
1567         return ret;
1568
1569 }
1570
1571 __export int osl_update_object(struct osl_table *t, const struct osl_row *r,
1572                 unsigned col_num, struct osl_object *obj)
1573 {
1574         struct osl_column *col;
1575         const struct osl_column_description *cd;
1576         int ret;
1577
1578         if (!t)
1579                 return -E_OSL_BAD_TABLE;
1580         col = &t->columns[col_num];
1581         cd = get_column_description(t->desc, col_num);
1582         DEBUG_LOG("updating column %u of %s\n", col_num, t->desc->name);
1583         if (cd->storage_flags & OSL_RBTREE) {
1584                 if (search_rbtree(obj, t, col_num, NULL, NULL) > 0)
1585                         return -E_OSL_RB_KEY_EXISTS;
1586         }
1587         if (cd->storage_flags & OSL_FIXED_SIZE) {
1588                 if (obj->size != cd->data_size)
1589                         return -E_OSL_BAD_DATA_SIZE;
1590         }
1591         remove_rb_node(t, col_num, r);
1592         if (cd->storage_type == OSL_NO_STORAGE) { /* TODO: If fixed size, reuse object? */
1593                 free(r->volatile_objects[col->volatile_num].data);
1594                 r->volatile_objects[col->volatile_num] = *obj;
1595         } else if (cd->storage_type == OSL_DISK_STORAGE) {
1596                 char *ds_name;
1597                 ret = disk_storage_name_of_row(t, r, &ds_name);
1598                 if (ret < 0)
1599                         return ret;
1600                 ret = delete_disk_storage_file(t, col_num, ds_name);
1601                 if (ret < 0 && !is_errno(-ret, ENOENT)) {
1602                         free(ds_name);
1603                         return ret;
1604                 }
1605                 ret = write_disk_storage_file(t, col_num, obj, ds_name);
1606                 free(ds_name);
1607                 if (ret < 0)
1608                         return ret;
1609         } else { /* mapped storage */
1610                 struct osl_object old_obj;
1611                 ret = get_mapped_object(t, col_num, r->num, &old_obj);
1612                 if (ret < 0)
1613                         return ret;
1614                 /*
1615                  * If the updated column is the disk storage name column, the
1616                  * disk storage name changes, so we have to rename all disk
1617                  * storage objects accordingly.
1618                  */
1619                 if (col_num == t->disk_storage_name_column) {
1620                         ret = rename_disk_storage_objects(t, &old_obj, obj);
1621                         if (ret < 0)
1622                                 return ret;
1623                 }
1624                 if (cd->storage_flags & OSL_FIXED_SIZE)
1625                         memcpy(old_obj.data, obj->data, cd->data_size);
1626                 else { /* TODO: if the size doesn't change, use old space */
1627                         uint32_t new_data_map_size;
1628                         char *row_index;
1629                         ret = get_row_index(t, r->num, &row_index);
1630                         if (ret < 0)
1631                                 return ret;
1632                         ret = mark_mapped_object_invalid(t, r->num, col_num);
1633                         if (ret < 0)
1634                                 return ret;
1635                         unmap_column(t, col_num);
1636                         ret = append_map_file(t, col_num, obj,
1637                                 &new_data_map_size);
1638                         if (ret < 0)
1639                                 return ret;
1640                         ret = map_column(t, col_num);
1641                         if (ret < 0)
1642                                 return ret;
1643                         update_cell_index(row_index, col, new_data_map_size,
1644                                 obj->size);
1645                 }
1646         }
1647         if (cd->storage_flags & OSL_RBTREE) {
1648                 ret = insert_rbtree(t, col_num, r, obj);
1649                 if (ret < 0)
1650                         return ret;
1651         }
1652         return 1;
1653 }
1654
1655 __export int osl_open_disk_object(const struct osl_table *t, const struct osl_row *r,
1656                 unsigned col_num, struct osl_object *obj)
1657 {
1658         const struct osl_column_description *cd;
1659         char *ds_name, *filename;
1660         int ret;
1661
1662         if (!t)
1663                 return -E_OSL_BAD_TABLE;
1664         cd = get_column_description(t->desc, col_num);
1665         if (cd->storage_type != OSL_DISK_STORAGE)
1666                 return -E_OSL_BAD_STORAGE_TYPE;
1667
1668         ret = disk_storage_name_of_row(t, r, &ds_name);
1669         if (ret < 0)
1670                 return ret;
1671         filename = disk_storage_path(t, col_num, ds_name);
1672         free(ds_name);
1673         if (!filename)
1674                 return -ERRNO_TO_ERROR(ENOMEM);
1675         DEBUG_LOG("filename: %s\n", filename);
1676         ret = mmap_full_file(filename, O_RDONLY, &obj->data, &obj->size, NULL);
1677         free(filename);
1678         return ret;
1679 }
1680
1681 __export int osl_close_disk_object(struct osl_object *obj)
1682 {
1683         return osl_munmap(obj->data, obj->size);
1684 }
1685
1686 __export int osl_get_num_rows(const struct osl_table *t, unsigned *num_rows)
1687 {
1688         if (!t)
1689                 return -E_OSL_BAD_TABLE;
1690         assert(t->num_rows >= t->num_invalid_rows);
1691         *num_rows = t->num_rows - t->num_invalid_rows;
1692         return 1;
1693 }
1694
1695 __export int osl_get_rank(const struct osl_table *t, struct osl_row *r,
1696                 unsigned col_num, unsigned *rank)
1697 {
1698         struct osl_object obj;
1699         struct osl_column *col;
1700         struct rb_node *node;
1701         int ret = check_rbtree_col(t, col_num, &col);
1702
1703         if (ret < 0)
1704                 return ret;
1705         ret = osl_get_object(t, r, col_num, &obj);
1706         if (ret < 0)
1707                 return ret;
1708         ret = search_rbtree(&obj, t, col_num, &node, NULL);
1709         if (ret < 0)
1710                 return ret;
1711         ret = rb_rank(node, rank);
1712         if (ret < 0)
1713                 return -E_OSL_BAD_ROW;
1714         return 1;
1715 }
1716
1717 __export int osl_get_nth_row(const struct osl_table *t, unsigned col_num,
1718                 unsigned n, struct osl_row **result)
1719 {
1720         struct osl_column *col;
1721         struct rb_node *node;
1722         unsigned num_rows;
1723         int ret;
1724
1725         if (n == 0)
1726                 return -E_OSL_RB_KEY_NOT_FOUND;
1727         ret = osl_get_num_rows(t, &num_rows);
1728         if (ret < 0)
1729                 return ret;
1730         if (n > num_rows)
1731                 return -E_OSL_RB_KEY_NOT_FOUND;
1732         ret = check_rbtree_col(t, col_num, &col);
1733         if (ret < 0)
1734                 return ret;
1735         node = rb_nth(col->rbtree.rb_node, n);
1736         if (!node)
1737                 return -E_OSL_RB_KEY_NOT_FOUND;
1738         *result = get_row_pointer(node, col->rbtree_num);
1739         return 1;
1740 }
1741
1742 __export int osl_rbtree_first_row(const struct osl_table *t, unsigned col_num,
1743                 struct osl_row **result)
1744 {
1745         return osl_get_nth_row(t, col_num, 1, result);
1746 }
1747
1748 __export int osl_rbtree_last_row(const struct osl_table *t, unsigned col_num,
1749                 struct osl_row **result)
1750 {
1751         unsigned num_rows;
1752         int ret = osl_get_num_rows(t, &num_rows);
1753
1754         if (ret < 0)
1755                 return ret;
1756         return osl_get_nth_row(t, col_num, num_rows, result);
1757 }