adu.c

   1 #include "adu.h"
   2 #include <dirent.h> /* readdir() */
   3
   4 #include "gcc-compat.h"
   5 #include "cmdline.h"
   6 #include "fd.h"
   7 #include "string.h"
   8 #include "error.h"
   9 #include "portable_io.h"
  10
  11 DEFINE_ERRLIST;
  12 int osl_errno;
  13
  14 /** Command line and config file options. */
  15 static struct gengetopt_args_info conf;
  16
  17 enum uid_info_flags {
  18         /** whether this slot of the hash table is used. */
  19         UI_FL_SLOT_USED = 1,
  20         /** whether this uid should be taken into account. */
  21         UI_FL_ADMISSIBLE = 2,
  22 };
  23
  24 struct user_info {
  25         uint32_t uid;
  26         uint32_t flags;
  27         struct osl_table *table;
  28         uint64_t files;
  29         uint64_t bytes;
  30         uint64_t dirs;
  31         struct osl_table_description *desc;
  32 };
  33
  34 /** The decimal representation of an uint64_t never exceeds that size. */
  35 #define FORMATED_VALUE_SIZE 25
  36
  37 #define FOR_EACH_USER(ui) for (ui = uid_hash_table; ui && ui < uid_hash_table \
  38                 + uid_hash_table_size; ui++)
  39
  40
  41 /**
  42  * Contains info for each user that owns at least one regular file.
  43  *
  44  * Even users that are not taken into account because of the --uid
  45  * option occupy a slot in this hash table. This allows to find out
  46  * quicky whether a uid is admissible. And yes, this has to be fast.
  47  */
  48 static struct user_info *uid_hash_table;
  49
  50 /* these get filled in by the select command. */
  51 static char count_unit_buf[4] = "( )", size_unit_buf[4] = "( )";
  52
  53 static inline int ui_used(struct user_info *ui)
  54 {
  55         return ui->flags & UI_FL_SLOT_USED;
  56 }
  57
  58 static inline int ui_admissible(struct user_info *ui)
  59 {
  60         return ui->flags & UI_FL_ADMISSIBLE;
  61 }
  62
  63 struct uid_range {
  64         uint32_t low;
  65         uint32_t high;
  66 };
  67
  68 static struct uid_range *admissible_uids;
  69
  70 static inline int check_uid_arg(const char *arg, uint32_t *uid)
  71 {
  72         const uint32_t max = ~0U;
  73         /*
  74          * we need an 64-bit int for string -> uid conversion because strtoll()
  75          * returns a signed value.
  76          */
  77         int64_t val;
  78         int ret = atoi64(arg, &val);
  79
  80         if (ret < 0)
  81                 return ret;
  82         if (val < 0 || val > max)
  83                 return -ERRNO_TO_ERROR(EINVAL);
  84         *uid = val;
  85         return 1;
  86 }
  87
  88 static int parse_uid_range(const char *orig_arg, struct uid_range *ur)
  89 {
  90         int ret;
  91         char *arg = adu_strdup(orig_arg), *p = strchr(arg, '-');
  92
  93         if (!p || p == arg) { /* -42 or 42 */
  94                 ret = check_uid_arg(p? p + 1 : arg, &ur->high);
  95                 if (ret < 0)
  96                         goto out;
  97                 ur->low = p? 0 : ur->high;
  98                 ret = 1;
  99                 goto out;
 100         }
 101         /* 42- or 42-4711 */
 102         *p = '\0';
 103         p++;
 104         ret = check_uid_arg(arg, &ur->low);
 105         if (ret < 0)
 106                 goto out;
 107         ur->high = ~0U;
 108         if (*p) { /* 42-4711 */
 109                 ret = check_uid_arg(p, &ur->high);
 110                 if (ret < 0)
 111                         goto out;
 112         }
 113         if (ur->low > ur->high)
 114                 ret = -ERRNO_TO_ERROR(EINVAL);
 115 out:
 116         if (ret < 0)
 117                 ERROR_LOG("bad uid option: %s\n", orig_arg);
 118         else
 119                 INFO_LOG("admissible uid range: %u - %u\n", ur->low,
 120                         ur->high);
 121         free(arg);
 122         return ret;
 123 }
 124
 125 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
 126 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 127
 128 /**
 129  * The log function.
 130  *
 131  * \param ll Loglevel.
 132  * \param fml Usual format string.
 133  *
 134  * All XXX_LOG() macros use this function.
 135  */
 136 __printf_2_3 void __log(int ll, const char* fmt,...)
 137 {
 138         va_list argp;
 139         FILE *outfd;
 140         struct tm *tm;
 141         time_t t1;
 142         char str[255] = "";
 143
 144         if (ll < conf.loglevel_arg)
 145                 return;
 146         outfd = stderr;
 147         time(&t1);
 148         tm = localtime(&t1);
 149         strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
 150         fprintf(outfd, "%s ", str);
 151         va_start(argp, fmt);
 152         vfprintf(outfd, fmt, argp);
 153         va_end(argp);
 154 }
 155
 156 /**
 157  * Compare the size of two directories
 158  *
 159  * \param obj1 Pointer to the first object.
 160  * \param obj2 Pointer to the second object.
 161  *
 162  * This function first compares the size values as usual integers. If they compare as
 163  * equal, the address of \a obj1 and \a obj2 are compared. So this compare function
 164  * returns zero if and only if \a obj1 and \a obj2 point to the same memory area.
 165  */
 166 static int size_compare(const struct osl_object *obj1, const struct osl_object *obj2)
 167 {
 168         uint64_t d1 = *(uint64_t *)obj1->data;
 169         uint64_t d2 = *(uint64_t *)obj2->data;
 170         int ret = NUM_COMPARE(d2, d1);
 171
 172         if (ret)
 173                 return ret;
 174         //INFO_LOG("addresses: %p, %p\n", obj1->data, obj2->data);
 175         return NUM_COMPARE(obj2->data, obj1->data);
 176 }
 177
 178 /**
 179  * Compare two osl objects pointing to unsigned integers of 64 bit size.
 180  *
 181  * \param obj1 Pointer to the first integer.
 182  * \param obj2 Pointer to the second integer.
 183  *
 184  * \return The values required for an osl compare function.
 185  *
 186  * \sa osl_compare_func, osl_hash_compare().
 187  */
 188 static int uint64_compare(const struct osl_object *obj1,
 189                 const struct osl_object *obj2)
 190 {
 191         uint64_t d1 = read_u64((const char *)obj1->data);
 192         uint64_t d2 = read_u64((const char *)obj2->data);
 193
 194         if (d1 < d2)
 195                 return 1;
 196         if (d1 > d2)
 197                 return -1;
 198         return 0;
 199 }
 200
 201 /** The columns of the directory table. */
 202 enum dir_table_columns {
 203         /** The name of the directory. */
 204         DT_NAME,
 205         /** The dir count number. */
 206         DT_NUM,
 207         /** The number of the parent directory. */
 208         DT_PARENT_NUM,
 209         /** The number of bytes of all regular files. */
 210         DT_BYTES,
 211         /** The number of all regular files. */
 212         DT_FILES,
 213         /** Number of columns in this table. */
 214         NUM_DT_COLUMNS
 215 };
 216
 217 static struct osl_column_description dir_table_cols[] = {
 218         [DT_NAME] = {
 219                 .storage_type = OSL_MAPPED_STORAGE,
 220                 .storage_flags = 0,
 221                 .name = "dir",
 222         },
 223         [DT_NUM] = {
 224                 .storage_type = OSL_MAPPED_STORAGE,
 225                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
 226                 .name = "num",
 227                 .compare_function = uint64_compare,
 228                 .data_size = sizeof(uint64_t)
 229         },
 230         [DT_PARENT_NUM] = {
 231                 .storage_type = OSL_MAPPED_STORAGE,
 232                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
 233                 .name = "parent_num",
 234                 .compare_function = size_compare,
 235                 .data_size = sizeof(uint64_t)
 236         },
 237         [DT_BYTES] = {
 238                 .storage_type = OSL_MAPPED_STORAGE,
 239                 .storage_flags =  OSL_RBTREE | OSL_FIXED_SIZE,
 240                 .compare_function = size_compare,
 241                 .name = "num_bytes",
 242                 .data_size = sizeof(uint64_t)
 243         },
 244         [DT_FILES] = {
 245                 .storage_type = OSL_MAPPED_STORAGE,
 246                 .storage_flags =  OSL_RBTREE | OSL_FIXED_SIZE,
 247                 .compare_function = size_compare,
 248                 .name = "num_files",
 249                 .data_size = sizeof(uint64_t)
 250         }
 251 };
 252
 253 static struct osl_table_description dir_table_desc = {
 254         .name = "dir_table",
 255         .num_columns = NUM_DT_COLUMNS,
 256         .flags = 0,
 257         .column_descriptions = dir_table_cols,
 258 };
 259
 260 /** The columns of the id table. */
 261 enum user_table_columns {
 262         /** The numer of the directory. */
 263         UT_DIR_NUM,
 264         /** The number of bytes of all regular files in this dir owned by this id. */
 265         UT_BYTES,
 266         /** The number of files in this dir owned by this id. */
 267         UT_FILES,
 268         /** Number of columns in this table. */
 269         NUM_UT_COLUMNS
 270 };
 271
 272 static struct osl_column_description user_table_cols[] = {
 273         [UT_DIR_NUM] = {
 274                 .storage_type = OSL_MAPPED_STORAGE,
 275                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
 276                 .name = "dir_num",
 277                 .compare_function = uint64_compare,
 278                 .data_size = sizeof(uint64_t)
 279         },
 280         [UT_BYTES] = {
 281                 .storage_type = OSL_MAPPED_STORAGE,
 282                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE,
 283                 .compare_function = size_compare,
 284                 .name = "num_bytes",
 285                 .data_size = sizeof(uint64_t)
 286         },
 287         [UT_FILES] = {
 288                 .storage_type = OSL_MAPPED_STORAGE,
 289                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE,
 290                 .compare_function = size_compare,
 291                 .name = "num_files",
 292                 .data_size = sizeof(uint64_t)
 293         },
 294 };
 295
 296 static struct osl_table *dir_table;
 297
 298 static int add_directory(char *dirname, uint64_t *dir_num, uint64_t *parent_dir_num,
 299                 uint64_t *dir_size, uint64_t *dir_files)
 300 {
 301         struct osl_object dir_objects[NUM_DT_COLUMNS];
 302
 303         INFO_LOG("adding #%llu: %s\n", (long long unsigned)*dir_num, dirname);
 304         dir_objects[DT_NAME].data = dirname;
 305         dir_objects[DT_NAME].size = strlen(dirname) + 1;
 306         dir_objects[DT_NUM].data = dir_num;
 307         dir_objects[DT_NUM].size = sizeof(*dir_num);
 308         dir_objects[DT_PARENT_NUM].data = parent_dir_num;
 309         dir_objects[DT_PARENT_NUM].size = sizeof(*parent_dir_num);
 310         dir_objects[DT_BYTES].data = dir_size;
 311         dir_objects[DT_BYTES].size = sizeof(*dir_size);
 312         dir_objects[DT_FILES].data = dir_files;
 313         dir_objects[DT_FILES].size = sizeof(*dir_files);
 314         return osl(osl_add_row(dir_table, dir_objects));
 315 }
 316
 317 static uint32_t num_uids;
 318
 319 static int open_user_table(struct user_info *ui, int create)
 320 {
 321         int ret;
 322
 323         ui->desc = adu_malloc(sizeof(*ui->desc));
 324         ui->desc->num_columns = NUM_UT_COLUMNS;
 325         ui->desc->flags = 0;
 326         ui->desc->column_descriptions = user_table_cols;
 327         ui->desc->dir = adu_strdup(conf.database_dir_arg);
 328         ui->desc->name = make_message("%u", (unsigned)ui->uid);
 329         INFO_LOG(".............................uid #%u: %u\n",
 330                 (unsigned)num_uids, (unsigned)ui->uid);
 331         if (create) {
 332                 ret = osl(osl_create_table(ui->desc));
 333                 if (ret < 0)
 334                         goto err;
 335                 num_uids++;
 336         }
 337         ret = osl(osl_open_table(ui->desc, &ui->table));
 338         if (ret < 0)
 339                 goto err;
 340         return 1;
 341 err:
 342         free((char *)ui->desc->name);
 343         free((char *)ui->desc->dir);
 344         free(ui->desc);
 345         ui->desc->name = NULL;
 346         ui->desc->dir = NULL;
 347         ui->desc = NULL;
 348         ui->table = NULL;
 349         ui->flags = 0;
 350         return ret;
 351 }
 352
 353 #define uid_hash_bits 8
 354 static uint32_t uid_hash_table_size = 1 << uid_hash_bits;
 355 #define PRIME1 0x811c9dc5
 356 #define PRIME2 0x01000193
 357
 358 static void create_hash_table(void)
 359 {
 360         uid_hash_table = adu_calloc(uid_hash_table_size
 361                 * sizeof(struct user_info));
 362 }
 363
 364 static void free_hash_table(void)
 365 {
 366         free(uid_hash_table);
 367         uid_hash_table = NULL;
 368 }
 369
 370 static int create_tables(void)
 371 {
 372         int ret;
 373
 374         dir_table_desc.dir = adu_strdup(conf.database_dir_arg);
 375         ret = osl(osl_create_table(&dir_table_desc));
 376         if (ret < 0)
 377                 return ret;
 378         create_hash_table();
 379         return 1;
 380 }
 381
 382 static void close_dir_table(void)
 383 {
 384         int ret;
 385
 386         if (!dir_table)
 387                 return;
 388         ret = osl(osl_close_table(dir_table, OSL_MARK_CLEAN));
 389         if (ret < 0)
 390                 ERROR_LOG("failed to close dir table: %s\n", adu_strerror(-ret));
 391         free((char *)dir_table_desc.dir);
 392         dir_table = NULL;
 393 }
 394
 395 static void close_user_table(struct user_info *ui)
 396 {
 397         int ret;
 398
 399         if (!ui || !ui_used(ui) || !ui_admissible(ui))
 400                 return;
 401         ret = osl(osl_close_table(ui->table, OSL_MARK_CLEAN));
 402         if (ret < 0)
 403                 ERROR_LOG("failed to close user table %u: %s\n",
 404                         (unsigned) ui->uid, adu_strerror(-ret));
 405         free((char *)ui->desc->name);
 406         ui->desc->name = NULL;
 407         free((char *)ui->desc->dir);
 408         ui->desc->dir = NULL;
 409         free(ui->desc);
 410         ui->desc = NULL;
 411         ui->table = NULL;
 412         ui->flags = 0;
 413 }
 414
 415 static void close_user_tables(void)
 416 {
 417         struct user_info *ui;
 418
 419         FOR_EACH_USER(ui)
 420                 close_user_table(ui);
 421 }
 422
 423 static void close_all_tables(void)
 424 {
 425         close_dir_table();
 426         close_user_tables();
 427         free_hash_table();
 428 }
 429
 430 static int signum;
 431
 432 static void signal_handler(int s)
 433 {
 434         signum = s;
 435 }
 436
 437 static void check_signals(void)
 438 {
 439         if (likely(!signum))
 440                 return;
 441         EMERG_LOG("caught signal %d\n", signum);
 442         close_all_tables();
 443         exit(EXIT_FAILURE);
 444 }
 445
 446 static int init_signals(void)
 447 {
 448         if (signal(SIGINT, &signal_handler) == SIG_ERR)
 449                 return -E_SIGNAL_SIG_ERR;
 450         if (signal(SIGTERM, &signal_handler) == SIG_ERR)
 451                 return -E_SIGNAL_SIG_ERR;
 452         return 1;
 453 }
 454
 455 /*
 456  * We use a hash table of size s=2^uid_hash_bits to map the uids into the
 457  * interval [0..s]. Hash collisions are treated by open addressing, i.e.
 458  * unused slots in the table are used to store different uids that hash to the
 459  * same slot.
 460  *
 461  * If a hash collision occurs, different slots are successively probed in order
 462  * to find an unused slot for the new uid. Probing is implemented via a second
 463  * hash function that maps the uid to h=(uid * PRIME2) | 1, which is always an
 464  * odd number.
 465  *
 466  * An odd number is sufficient to make sure each entry of the hash table gets
 467  * probed for probe_num between 0 and s-1 because s is a power of two, hence
 468  * the second hash value has never a common divisor with the hash table size.
 469  * IOW: h is invertible in the ring [0..s].
 470  */
 471 static uint32_t double_hash(uint32_t uid, uint32_t probe_num)
 472 {
 473         return (uid * PRIME1 + ((uid * PRIME2) | 1) * probe_num)
 474                 % uid_hash_table_size;
 475 }
 476
 477 enum search_uid_flags {
 478         OPEN_USER_TABLE = 1,
 479         CREATE_USER_TABLE = 2,
 480 };
 481
 482 static int uid_is_admissible(uint32_t uid)
 483 {
 484         int i;
 485
 486         for (i = 0; i < conf.uid_given; i++) {
 487                 struct uid_range *ur = admissible_uids + i;
 488
 489                 if (ur->low <= uid && ur->high >= uid)
 490                         break;
 491         }
 492         i = !conf.uid_given || i < conf.uid_given;
 493         DEBUG_LOG("uid %u is %sadmissible\n", (unsigned)uid,
 494                 i? "" : "not ");
 495         return i;
 496 }
 497
 498 static int search_uid(uint32_t uid, enum search_uid_flags flags,
 499                 struct user_info **ui_ptr)
 500 {
 501         uint32_t p;
 502
 503         for (p = 0; p < uid_hash_table_size; p++) {
 504                 struct user_info *ui = uid_hash_table + double_hash(uid, p);
 505
 506                 if (!ui_used(ui)) {
 507                         int ret;
 508                         if (!flags)
 509                                 return -E_BAD_UID;
 510                         ui->uid = uid;
 511                         ui->flags |= UI_FL_SLOT_USED;
 512                         if (!uid_is_admissible(uid))
 513                                 return 0;
 514                         ui->flags |= UI_FL_ADMISSIBLE;
 515                         ret = open_user_table(ui, flags & CREATE_USER_TABLE);
 516                         if (ret < 0)
 517                                 return ret;
 518
 519                         if (ui_ptr)
 520                                 *ui_ptr = ui;
 521                         return 1;
 522                 }
 523                 if (ui->uid != uid)
 524                         continue;
 525                 if (ui_ptr)
 526                         *ui_ptr = ui;
 527                 return 0;
 528         }
 529         return flags? -E_HASH_TABLE_OVERFLOW : -E_BAD_UID;
 530 }
 531
 532 static int update_user_row(struct osl_table *t, uint64_t dir_num,
 533                 uint64_t *add)
 534 {
 535         struct osl_row *row;
 536         struct osl_object obj = {.data = &dir_num, .size = sizeof(dir_num)};
 537
 538         int ret = osl(osl_get_row(t, UT_DIR_NUM, &obj, &row));
 539
 540         if (ret == -E_OSL && osl_errno != E_OSL_RB_KEY_NOT_FOUND)
 541                 return ret;
 542         if (ret < 0) { /* this is the first file we add */
 543                 struct osl_object objects[NUM_UT_COLUMNS];
 544                 uint64_t num_files = 1;
 545
 546                 objects[UT_DIR_NUM].data = &dir_num;
 547                 objects[UT_DIR_NUM].size = sizeof(dir_num);
 548                 objects[UT_BYTES].data = add;
 549                 objects[UT_BYTES].size = sizeof(*add);
 550                 objects[UT_FILES].data = &num_files;
 551                 objects[UT_FILES].size = sizeof(num_files);
 552                 INFO_LOG("######################### ret: %d\n", ret);
 553                 ret = osl(osl_add_row(t, objects));
 554                 INFO_LOG("######################### ret: %d\n", ret);
 555                 return ret;
 556         } else { /* add size and increment file count */
 557                 uint64_t num;
 558                 struct osl_object obj1, obj2 = {.data = &num, .size = sizeof(num)};
 559
 560                 ret = osl(osl_get_object(t, row, UT_BYTES, &obj1));
 561                 if (ret < 0)
 562                         return ret;
 563                 num = *(uint64_t *)obj1.data + *add;
 564                 ret = osl(osl_update_object(t, row, UT_BYTES, &obj2));
 565                 if (ret < 0)
 566                         return ret;
 567                 ret = osl(osl_get_object(t, row, UT_FILES, &obj1));
 568                 if (ret < 0)
 569                         return ret;
 570                 num = *(uint64_t *)obj1.data + 1;
 571                 return osl(osl_update_object(t, row, UT_FILES, &obj2));
 572         }
 573 }
 574
 575 static uint64_t num_dirs;
 576 static uint64_t num_files;
 577 static uint64_t num_bytes;
 578
 579 /* id of the device containing the base dir. */
 580 static dev_t device_id;
 581
 582 static int scan_dir(char *dirname, uint64_t *parent_dir_num)
 583 {
 584         DIR *dir;
 585         struct dirent *entry;
 586         int ret, cwd_fd, ret2;
 587         uint64_t dir_size = 0, dir_files = 0;
 588         uint64_t this_dir_num = ++num_dirs;
 589
 590         check_signals();
 591         DEBUG_LOG("----------------- %llu: %s\n", (long long unsigned)num_dirs, dirname);
 592         ret = adu_opendir(dirname, &dir, &cwd_fd);
 593         if (ret < 0) {
 594                 if (ret != -ERRNO_TO_ERROR(EACCES))
 595                         return ret;
 596                 WARNING_LOG("permission denied for %s\n", dirname);
 597                 return 1;
 598         }
 599         while ((entry = readdir(dir))) {
 600                 mode_t m;
 601                 struct stat s;
 602                 uint32_t uid;
 603                 uint64_t size;
 604                 struct user_info *ui;
 605
 606                 if (!strcmp(entry->d_name, "."))
 607                         continue;
 608                 if (!strcmp(entry->d_name, ".."))
 609                         continue;
 610                 if (lstat(entry->d_name, &s) == -1) {
 611                         WARNING_LOG("lstat error for %s/%s\n", dirname,
 612                                 entry->d_name);
 613                         continue;
 614                 }
 615                 m = s.st_mode;
 616                 if (!S_ISREG(m) && !S_ISDIR(m))
 617                         continue;
 618                 if (S_ISDIR(m)) {
 619                         if (conf.one_file_system_given && s.st_dev != device_id)
 620                                 continue;
 621                         ret = scan_dir(entry->d_name, &this_dir_num);
 622                         if (ret < 0)
 623                                 goto out;
 624                         continue;
 625                 }
 626                 /* regular file */
 627                 size = s.st_size;
 628                 dir_size += size;
 629                 num_bytes += size;
 630                 dir_files++;
 631                 num_files++;
 632                 uid = s.st_uid;
 633                 ret = search_uid(uid, CREATE_USER_TABLE | OPEN_USER_TABLE, &ui);
 634                 if (ret < 0)
 635                         goto out;
 636                 ui->bytes += size;
 637                 ui->files++;
 638                 ret = update_user_row(ui->table, this_dir_num, &size);
 639                 if (ret < 0)
 640                         goto out;
 641         }
 642         ret = add_directory(dirname, &this_dir_num, parent_dir_num,
 643                         &dir_size, &dir_files);
 644 out:
 645         closedir(dir);
 646         ret2 = adu_fchdir(cwd_fd);
 647         if (ret2 < 0 && ret >= 0)
 648                 ret = ret2;
 649         close(cwd_fd);
 650         return ret;
 651 }
 652
 653 static int get_dir_name_by_number(uint64_t *dirnum, char **name)
 654 {
 655         char *result = NULL, *tmp;
 656         struct osl_row *row;
 657         uint64_t val = *dirnum;
 658         struct osl_object obj = {.data = &val, .size = sizeof(val)};
 659         int ret;
 660
 661 again:
 662         ret = osl(osl_get_row(dir_table, DT_NUM, &obj, &row));
 663         if (ret < 0)
 664                 goto out;
 665         ret = osl(osl_get_object(dir_table, row, DT_NAME, &obj));
 666         if (ret < 0)
 667                 goto out;
 668         if (result) {
 669                 tmp = make_message("%s/%s", (char *)obj.data, result);
 670                 free(result);
 671                 result = tmp;
 672         } else
 673                 result = adu_strdup((char *)obj.data);
 674         ret = osl(osl_get_object(dir_table, row, DT_PARENT_NUM, &obj));
 675         if (ret < 0)
 676                 goto out;
 677         val = *(uint64_t *)obj.data;
 678         if (val)
 679                 goto again;
 680 out:
 681         if (ret < 0) {
 682                 free(result);
 683                 *name = NULL;
 684         } else
 685                 *name = result;
 686         return ret;
 687 }
 688
 689 static int get_dir_name_of_row(struct osl_row *dir_table_row, char **name)
 690 {
 691         struct osl_object obj;
 692         int ret;
 693         char *this_dir, *prefix = NULL;
 694
 695         *name = NULL;
 696         ret = osl(osl_get_object(dir_table, dir_table_row, DT_NAME, &obj));
 697         if (ret < 0)
 698                 return ret;
 699         this_dir = adu_strdup((char *)obj.data);
 700         ret = osl(osl_get_object(dir_table, dir_table_row, DT_PARENT_NUM, &obj));
 701         if (ret < 0)
 702                 goto out;
 703         if (!*(uint64_t *)obj.data) {
 704                 *name = this_dir;
 705                 return 1;
 706         }
 707         ret = get_dir_name_by_number((uint64_t *)obj.data, &prefix);
 708         if (ret < 0)
 709                 goto out;
 710         *name = make_message("%s/%s", prefix, this_dir);
 711         free(prefix);
 712         ret = 1;
 713 out:
 714         free(this_dir);
 715         return ret;
 716 }
 717
 718 const uint64_t size_unit_divisors[] = {
 719         [size_unit_arg_b] = 1ULL,
 720         [size_unit_arg_k] = 1024ULL,
 721         [size_unit_arg_m] = 1024ULL * 1024ULL,
 722         [size_unit_arg_g] = 1024ULL * 1024ULL * 1024ULL,
 723         [size_unit_arg_t] = 1024ULL * 1024ULL * 1024ULL * 1024ULL,
 724 };
 725
 726 const uint64_t count_unit_divisors[] = {
 727
 728         [count_unit_arg_n] = 1ULL,
 729         [count_unit_arg_k] = 1000ULL,
 730         [count_unit_arg_m] = 1000ULL * 1000ULL,
 731         [count_unit_arg_g] = 1000ULL * 1000ULL * 1000ULL,
 732         [count_unit_arg_t] = 1000ULL * 1000ULL * 1000ULL * 1000ULL,
 733 };
 734
 735 const char size_unit_abbrevs[] = " BKMGT";
 736 const char count_unit_abbrevs[] = "  kmgt";
 737
 738 static enum enum_size_unit format_size_value(enum enum_size_unit unit,
 739                 uint64_t value, int print_unit, char *result)
 740 {
 741         enum enum_size_unit u = unit;
 742         char unit_buf[2] = "\0\0";
 743
 744         if (unit == size_unit_arg_h) /* human readable */
 745                 for (u = size_unit_arg_b; u < size_unit_arg_t &&
 746                                 value > size_unit_divisors[u + 1]; u++)
 747                         ; /* nothing */
 748         if (print_unit)
 749                 unit_buf[0] = size_unit_abbrevs[u];
 750         sprintf(result, "%llu%s",
 751                 (long long unsigned)value / size_unit_divisors[u], unit_buf);
 752         return u;
 753 }
 754
 755 static enum enum_count_unit format_count_value(enum enum_count_unit unit,
 756                 uint64_t value, int print_unit, char *result)
 757 {
 758         enum enum_count_unit u = unit;
 759         char unit_buf[2] = "\0\0";
 760
 761         if (unit == count_unit_arg_h) /* human readable */
 762                 for (u = count_unit_arg_n; u < count_unit_arg_t &&
 763                                 value > count_unit_divisors[u + 1]; u++)
 764                         ; /* nothing */
 765         if (print_unit)
 766                 unit_buf[0] = count_unit_abbrevs[u];
 767         sprintf(result, "%llu%s",
 768                 (long long unsigned)value / count_unit_divisors[u], unit_buf);
 769         return u;
 770 }
 771
 772 enum global_stats_flags {
 773         GSF_PRINT_DIRNAME = 1,
 774         GSF_PRINT_BYTES = 2,
 775         GSF_PRINT_FILES = 4,
 776         GSF_COMPUTE_SUMMARY = 8,
 777 };
 778
 779 struct global_stats_info {
 780         uint32_t count;
 781         int ret;
 782         int osl_errno;
 783         enum global_stats_flags flags;
 784 };
 785
 786 static int global_stats_loop_function(struct osl_row *row, void *data)
 787 {
 788         struct global_stats_info *gsi = data;
 789         struct osl_object obj;
 790         char *dirname, formated_value[FORMATED_VALUE_SIZE];
 791         int ret, summary = gsi->flags & GSF_COMPUTE_SUMMARY;
 792
 793         check_signals();
 794         if (!gsi->count && !summary) {
 795                 ret = -E_LOOP_COMPLETE;
 796                 goto err;
 797         }
 798         if (summary || (gsi->count && (gsi->flags & GSF_PRINT_FILES))) {
 799                 uint64_t files;
 800                 ret = osl(osl_get_object(dir_table, row, DT_FILES, &obj));
 801                 if (ret < 0)
 802                         goto err;
 803                 files = *(uint64_t *)obj.data;
 804                 if (gsi->count && (gsi->flags & GSF_PRINT_FILES)) {
 805                         format_count_value(conf.count_unit_arg, files,
 806                                 conf.count_unit_arg == count_unit_arg_h,
 807                                 formated_value);
 808                         printf("\t%s%s", formated_value,
 809                                 (gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_DIRNAME))?
 810                                 "\t" : "\n");
 811                 }
 812                 if (summary)
 813                         num_files += files;
 814         }
 815         if (summary || (gsi->count && (gsi->flags & GSF_PRINT_BYTES))) {
 816                 uint64_t bytes;
 817                 ret = osl(osl_get_object(dir_table, row, DT_BYTES, &obj));
 818                 if (ret < 0)
 819                         goto err;
 820                 bytes = *(uint64_t *)obj.data;
 821                 if (gsi->count && (gsi->flags & GSF_PRINT_BYTES)) {
 822                         format_size_value(conf.size_unit_arg, bytes,
 823                                 conf.size_unit_arg == size_unit_arg_h,
 824                                 formated_value);
 825                         printf("%s%s%s",
 826                                 (gsi->flags & GSF_PRINT_FILES)? "" : "\t",
 827                                 formated_value,
 828                                 (gsi->flags & GSF_PRINT_DIRNAME)? "\t" : "\n"
 829                         );
 830                 }
 831                 if (summary) {
 832                         num_bytes += bytes;
 833                         num_dirs++;
 834                 }
 835         }
 836         if (gsi->count && (gsi->flags & GSF_PRINT_DIRNAME)) {
 837                 ret = get_dir_name_of_row(row, &dirname);
 838                 if (ret < 0)
 839                         goto err;
 840                 printf("%s%s\n",
 841                         (gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_FILES))? "" : "\t",
 842                         dirname);
 843                 free(dirname);
 844         }
 845         if (gsi->count > 0)
 846                 gsi->count--;
 847         return 1;
 848 err:
 849         gsi->ret = ret;
 850         gsi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
 851         return -1;
 852 }
 853
 854 static void print_id_stats(void)
 855 {
 856         struct user_info *ui;
 857
 858         printf("User summary "
 859                 "(uid/dirs%s/files%s/size%s):\n",
 860                 count_unit_buf, count_unit_buf, size_unit_buf);
 861         FOR_EACH_USER(ui) {
 862                 char formated_dir_count[FORMATED_VALUE_SIZE],
 863                         formated_file_count[FORMATED_VALUE_SIZE],
 864                         formated_bytes[FORMATED_VALUE_SIZE ];
 865                 if (!ui_used(ui) || !ui_admissible(ui))
 866                         continue;
 867                 format_count_value(conf.count_unit_arg, ui->dirs,
 868                         conf.count_unit_arg == count_unit_arg_h,
 869                         formated_dir_count);
 870                 format_count_value(conf.count_unit_arg, ui->files,
 871                         conf.count_unit_arg == count_unit_arg_h,
 872                         formated_file_count);
 873                 format_size_value(conf.size_unit_arg, ui->bytes,
 874                         conf.size_unit_arg == size_unit_arg_h,
 875                         formated_bytes);
 876                 printf("\t%u\t%s\t%s\t%s\n", (unsigned)ui->uid,
 877                         formated_dir_count,
 878                         formated_file_count,
 879                         formated_bytes
 880                 );
 881         }
 882 }
 883
 884 enum user_stats_flags {
 885         USF_PRINT_DIRNAME = 1,
 886         USF_PRINT_BYTES = 2,
 887         USF_PRINT_FILES = 4,
 888         USF_COMPUTE_SUMMARY = 8,
 889 };
 890
 891 struct user_stats_info {
 892         uint32_t count;
 893         enum user_stats_flags flags;
 894         int ret;
 895         int osl_errno;
 896         struct user_info *ui;
 897 };
 898
 899 static int user_stats_loop_function(struct osl_row *row, void *data)
 900 {
 901         struct user_stats_info *usi = data;
 902         struct osl_object obj;
 903         int ret, summary = usi->flags & GSF_COMPUTE_SUMMARY;
 904         char formated_value[FORMATED_VALUE_SIZE];
 905
 906         check_signals();
 907         if (!usi->count && !summary) {
 908                 ret = -E_LOOP_COMPLETE;
 909                 goto err;
 910         }
 911         if (summary || (usi->count && (usi->flags & USF_PRINT_FILES))) {
 912                 uint64_t files;
 913                 ret = osl(osl_get_object(usi->ui->table, row, UT_FILES, &obj));
 914                 if (ret < 0)
 915                         goto err;
 916                 files = *(uint64_t *)obj.data;
 917                 if (usi->count && (usi->flags & USF_PRINT_FILES)) {
 918                         format_count_value(conf.count_unit_arg, files,
 919                                 conf.count_unit_arg == count_unit_arg_h,
 920                                 formated_value);
 921                         printf("\t%s%s", formated_value,
 922                                 (usi->flags & (USF_PRINT_BYTES | USF_PRINT_DIRNAME))?
 923                                         "\t" : "\n"
 924                         );
 925                 }
 926                 if (summary)
 927                         usi->ui->files += files;
 928         }
 929         if (summary || (usi->count && (usi->flags & USF_PRINT_BYTES))) {
 930                 uint64_t bytes;
 931                 ret = osl(osl_get_object(usi->ui->table, row, UT_BYTES, &obj));
 932                 if (ret < 0)
 933                         goto err;
 934                 bytes = *(uint64_t *)obj.data;
 935                 if (usi->count && (usi->flags & USF_PRINT_BYTES)) {
 936                         format_size_value(conf.size_unit_arg, bytes,
 937                                 conf.size_unit_arg == size_unit_arg_h,
 938                                 formated_value);
 939                         printf("%s%s%s",
 940                                 (usi->flags & USF_PRINT_FILES)? "" : "\t",
 941                                 formated_value,
 942                                 usi->flags & USF_PRINT_DIRNAME?  "\t" : "\n"
 943                         );
 944                 }
 945                 if (summary) {
 946                         usi->ui->bytes += bytes;
 947                         usi->ui->dirs++;
 948                 }
 949
 950         }
 951         if (usi->count && (usi->flags & USF_PRINT_DIRNAME)) {
 952                 char *dirname;
 953                 ret = osl(osl_get_object(usi->ui->table, row, UT_DIR_NUM, &obj));
 954                 if (ret < 0)
 955                         goto err;
 956                 ret = get_dir_name_by_number((uint64_t *)obj.data, &dirname);
 957                 if (ret < 0)
 958                         goto err;
 959                 printf("%s%s\n",
 960                         (usi->flags & (USF_PRINT_BYTES | USF_PRINT_FILES))? "" : "\t",
 961                         dirname);
 962                 free(dirname);
 963         }
 964         if (usi->count > 0)
 965                 usi->count--;
 966         return 1;
 967 err:
 968         usi->ret = ret;
 969         usi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
 970         return -1;
 971 }
 972
 973 static int check_loop_return(int ret, int loop_ret, int loop_osl_errno)
 974 {
 975         if (ret >= 0)
 976                 return ret;
 977         assert(ret == -E_OSL);
 978         if (osl_errno != E_OSL_LOOP)
 979                 /* error not caused by loop function returning negative. */
 980                 return ret;
 981         assert(loop_ret < 0);
 982         if (loop_ret == -E_LOOP_COMPLETE) /* no error */
 983                 return 1;
 984         if (loop_ret == -E_OSL) { /* osl error in loop function */
 985                 assert(loop_osl_errno);
 986                 osl_errno = loop_osl_errno;
 987         }
 988         return loop_ret;
 989 }
 990
 991 static int adu_loop_reverse(struct osl_table *t, unsigned col_num, void *private_data,
 992                 osl_rbtree_loop_func *func, int *loop_ret, int *loop_osl_errno)
 993 {
 994         int ret = osl(osl_rbtree_loop_reverse(t, col_num, private_data, func));
 995         return check_loop_return(ret, *loop_ret, *loop_osl_errno);
 996 }
 997
 998 static int print_user_stats(void)
 999 {
1000         struct user_info *ui;
1001         int ret;
1002
1003         FOR_EACH_USER(ui) {
1004                 struct user_stats_info usi = {
1005                         .count = conf.limit_arg,
1006                         .ui = ui
1007                 };
1008                 if (!ui_used(ui) || !ui_admissible(ui))
1009                         continue;
1010                 usi.flags = USF_PRINT_DIRNAME | USF_PRINT_BYTES | USF_COMPUTE_SUMMARY;
1011                 printf("uid %u, by size%s:\n",
1012                         (unsigned) ui->uid, size_unit_buf);
1013                 ret = adu_loop_reverse(ui->table, UT_BYTES, &usi, user_stats_loop_function,
1014                         &usi.ret, &usi.osl_errno);
1015                 if (ret < 0)
1016                         return ret;
1017                 printf("\nuid %u, by file count%s:\n",
1018                         (unsigned) ui->uid, count_unit_buf);
1019                 usi.count = conf.limit_arg,
1020                 usi.flags = USF_PRINT_DIRNAME | USF_PRINT_FILES;
1021                 ret = adu_loop_reverse(ui->table, UT_FILES, &usi, user_stats_loop_function,
1022                         &usi.ret, &usi.osl_errno);
1023                 if (ret < 0)
1024                         return ret;
1025                 printf("\n");
1026         }
1027         return 1;
1028 }
1029
1030 static void print_global_summary(void)
1031 {
1032         char d[FORMATED_VALUE_SIZE], f[FORMATED_VALUE_SIZE],
1033                 s[FORMATED_VALUE_SIZE];
1034         enum enum_count_unit ud, uf;
1035         enum enum_size_unit us;
1036
1037         ud = format_count_value(conf.count_unit_arg, num_dirs, 0, d);
1038         uf = format_count_value(conf.count_unit_arg, num_files, 0, f);
1039         us = format_size_value(conf.size_unit_arg, num_bytes, 0, s);
1040
1041         printf("Global summary "
1042                 "(dirs(%c)/files(%c)/size(%c))\n"
1043                 "\t%s\t%s\t%s\n\n",
1044                 count_unit_abbrevs[ud],
1045                 count_unit_abbrevs[uf],
1046                 size_unit_abbrevs[us],
1047                 d, f, s
1048         );
1049
1050 }
1051
1052 static int print_statistics(void)
1053 {
1054         int ret;
1055         struct global_stats_info gsi = {
1056                 .count = conf.limit_arg,
1057                 .flags = GSF_PRINT_DIRNAME | GSF_PRINT_BYTES | GSF_COMPUTE_SUMMARY
1058         };
1059
1060         printf("By size%s:\n",
1061                 size_unit_buf);
1062         ret = adu_loop_reverse(dir_table, DT_BYTES, &gsi,
1063                 global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
1064         if (ret < 0)
1065                 return ret;
1066         printf("\n");
1067
1068         gsi.count = conf.limit_arg;
1069         gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_FILES;
1070         printf("By file count%s:\n",
1071                 count_unit_buf);
1072         ret = adu_loop_reverse(dir_table, DT_FILES, &gsi,
1073                 global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
1074         if (ret < 0)
1075                 return ret;
1076         printf("\n");
1077         print_global_summary();
1078         print_user_stats();
1079         print_id_stats();
1080         return 1;
1081 }
1082
1083 static char *get_uid_list_name(void)
1084 {
1085         return make_message("%s/uid_list", conf.database_dir_arg);
1086 }
1087
1088 static int write_uid_list(void)
1089 {
1090         char *buf, *filename;
1091         uint32_t count = 0;
1092         struct user_info *ui;
1093         size_t size = num_uids * sizeof(uint32_t);
1094         int ret;
1095
1096         if (!num_uids)
1097                 return 0;
1098         buf = adu_malloc(size);
1099         FOR_EACH_USER(ui) {
1100                 if (!ui_used(ui) || !ui_admissible(ui))
1101                         continue;
1102                 DEBUG_LOG("saving uid %u\n", (unsigned) ui->uid);
1103                 write_u32(buf + count++ * sizeof(uint32_t), ui->uid);
1104         }
1105         filename = get_uid_list_name();
1106         ret = adu_write_file(filename, buf, size);
1107         free(filename);
1108         free(buf);
1109         return ret;
1110 }
1111
1112 static int open_dir_table(void)
1113 {
1114         if (!dir_table_desc.dir) /* we did not create the table */
1115                 dir_table_desc.dir = adu_strdup(conf.database_dir_arg);
1116         return osl(osl_open_table(&dir_table_desc, &dir_table));
1117 }
1118 static int com_create()
1119 {
1120         uint64_t zero = 0ULL;
1121         int ret;
1122         struct stat statbuf;
1123
1124         if (lstat(conf.base_dir_arg, &statbuf) == -1)
1125                 return -ERRNO_TO_ERROR(errno);
1126         if (!S_ISDIR(statbuf.st_mode))
1127                 return -ERRNO_TO_ERROR(ENOTDIR);
1128         device_id = statbuf.st_dev;
1129         ret = create_tables();
1130         if (ret < 0)
1131                 return ret;
1132         check_signals();
1133         ret = open_dir_table();
1134         if (ret < 0)
1135                 return ret;
1136         check_signals();
1137         ret = scan_dir(conf.base_dir_arg, &zero);
1138         if (ret < 0)
1139                 goto out;
1140         ret = write_uid_list();
1141 out:
1142         close_all_tables();
1143         return ret;
1144 }
1145
1146 static int read_uid_file(void)
1147 {
1148         size_t size;
1149         uint32_t n;
1150         char *filename = get_uid_list_name(), *map;
1151         int ret = mmap_full_file(filename, O_RDONLY, (void **)&map, &size, NULL);
1152
1153         if (ret < 0) {
1154                 INFO_LOG("failed to map %s\n", filename);
1155                 free(filename);
1156                 return ret;
1157         }
1158         num_uids = size / 4;
1159         INFO_LOG("found %u uids in %s\n", (unsigned)num_uids, filename);
1160         free(filename);
1161         /* hash table size should be a power of two and larger than the number of uids */
1162         uid_hash_table_size = 4;
1163         while (uid_hash_table_size < num_uids)
1164                 uid_hash_table_size *= 2;
1165         create_hash_table();
1166         for (n = 0; n < num_uids; n++) {
1167                 uint32_t uid = read_u32(map + n * sizeof(uid));
1168                 ret = search_uid(uid, OPEN_USER_TABLE, NULL);
1169                 if (ret < 0)
1170                         goto out;
1171         }
1172 out:
1173         adu_munmap(map, size);
1174         return ret;
1175 }
1176
1177 static int com_select(void)
1178 {
1179         int ret;
1180
1181         if (conf.count_unit_arg != count_unit_arg_h)
1182                 count_unit_buf[1] = count_unit_abbrevs[conf.count_unit_arg];
1183         else
1184                 count_unit_buf[0] = '\0';
1185         if (conf.size_unit_arg != size_unit_arg_h)
1186                 size_unit_buf[1] = size_unit_abbrevs[conf.size_unit_arg];
1187         else
1188                 size_unit_buf[0] = '\0';
1189
1190         ret = open_dir_table();
1191         if (ret < 0)
1192                 return ret;
1193         check_signals();
1194         ret = read_uid_file();
1195         if (ret < 0)
1196                 return ret;
1197         check_signals();
1198         ret = print_statistics();
1199         close_all_tables();
1200         return ret;
1201 }
1202
1203 static int check_args(void)
1204 {
1205         int i, ret;
1206
1207         /* remove trailing slashes from base-dir arg */
1208         if (conf.base_dir_given) {
1209                 size_t len = strlen(conf.base_dir_arg);
1210                 for (;;) {
1211                         if (!len) /* empty string */
1212                                 return -ERRNO_TO_ERROR(EINVAL);
1213                         if (!--len) /* length 1 is always OK */
1214                                 break;
1215                         if (conf.base_dir_arg[len] != '/')
1216                                 break; /* no trailing slash, also OK */
1217                         conf.base_dir_arg[len] = '\0';
1218                 }
1219         }
1220         if (!conf.uid_given)
1221                 return 0;
1222         admissible_uids = adu_malloc(conf.uid_given * sizeof(*admissible_uids));
1223         for (i = 0; i < conf.uid_given; i++) {
1224                 ret = parse_uid_range(conf.uid_arg[i], admissible_uids + i);
1225                 if (ret < 0)
1226                         goto err;
1227         }
1228         return 1;
1229 err:
1230         free(admissible_uids);
1231         admissible_uids = NULL;
1232         return ret;
1233 }
1234
1235 int main(int argc, char **argv)
1236 {
1237         int ret;
1238         struct cmdline_parser_params params = {
1239                 .override = 0,
1240                 .initialize = 1,
1241                 .check_required = 0,
1242                 .check_ambiguity = 0,
1243                 .print_errors = 1
1244         };
1245
1246         cmdline_parser_ext(argc, argv, &conf, &params); /* aborts on errors */
1247         ret = init_signals();
1248         if (ret < 0)
1249                 goto out;
1250         ret = check_args();
1251         if (ret < 0)
1252                 goto out;
1253         ret = -E_SYNTAX;
1254         if (conf.select_given)
1255                 ret = com_select();
1256         else
1257                 ret = com_create();
1258         if (ret < 0)
1259                 goto out;
1260 out:
1261         free(admissible_uids);
1262         if (ret < 0) {
1263                 ERROR_LOG("%s\n", adu_strerror(-ret));
1264                 return -EXIT_FAILURE;
1265         }
1266         return EXIT_SUCCESS;
1267 }