blob.c

   1 /* Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file blob.c Macros and functions for blob handling. */
   4
   5 #include <regex.h>
   6 #include <fnmatch.h>
   7 #include <osl.h>
   8 #include <lopsub.h>
   9
  10 #include "server_cmd.lsg.h"
  11 #include "para.h"
  12 #include "error.h"
  13 #include "crypt.h"
  14 #include "string.h"
  15 #include "afh.h"
  16 #include "afs.h"
  17 #include "ipc.h"
  18 #include "portable_io.h"
  19 #include "sideband.h"
  20 #include "command.h"
  21
  22 /**
  23  * Compare two osl objects pointing to unsigned integers of 32 bit size.
  24  *
  25  * \param obj1 Pointer to the first integer.
  26  * \param obj2 Pointer to the second integer.
  27  *
  28  * \return The values required for an osl compare function.
  29  */
  30 static int uint32_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  31 {
  32         uint32_t d1 = read_u32(obj1->data);
  33         uint32_t d2 = read_u32(obj2->data);
  34
  35         if (d1 < d2)
  36                 return 1;
  37         if (d1 > d2)
  38                 return -1;
  39         return 0;
  40 }
  41
  42 static struct osl_column_description blob_cols[] = {
  43         [BLOBCOL_ID] = {
  44                 .storage_type = OSL_MAPPED_STORAGE,
  45                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  46                 .name = "id",
  47                 .data_size = 4,
  48                 .compare_function = uint32_compare
  49         },
  50         [BLOBCOL_NAME] = {
  51                 .storage_type = OSL_MAPPED_STORAGE,
  52                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  53                 .name = "name",
  54                 .compare_function = string_compare
  55         },
  56         [BLOBCOL_DEF] = {
  57                 .storage_type = OSL_DISK_STORAGE,
  58                 .storage_flags = 0,
  59                 .name = "definition"
  60         }
  61 };
  62
  63 /** Define an osl table description for a blob table. */
  64 #define DEFINE_BLOB_TABLE_DESC(table_name) \
  65         static struct osl_table_description table_name ## _table_desc = { \
  66                 .name = #table_name, \
  67                 .num_columns = NUM_BLOB_COLUMNS, \
  68                 .flags = OSL_LARGE_TABLE, \
  69                 .column_descriptions = blob_cols \
  70         };
  71
  72 /** Define a pointer to an osl blob table with a canonical name. */
  73 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
  74
  75 /** Define a blob table. */
  76 #define INIT_BLOB_TABLE(table_name) \
  77         DEFINE_BLOB_TABLE_DESC(table_name); \
  78         DEFINE_BLOB_TABLE_PTR(table_name);
  79
  80 /* doxygen isn't smart enough to recognize these */
  81 /** \cond blob_table */
  82 INIT_BLOB_TABLE(lyrics);
  83 INIT_BLOB_TABLE(images);
  84 INIT_BLOB_TABLE(moods);
  85 INIT_BLOB_TABLE(playlists);
  86 /** \endcond blob_table */
  87
  88 static int print_blob(struct osl_table *table, struct osl_row *row,
  89                 const char *name, void *data)
  90 {
  91         struct afs_callback_arg *aca = data;
  92         bool l_given = SERVER_CMD_OPT_GIVEN(LSMOOD, LONG, aca->lpr);
  93         struct osl_object obj;
  94         uint32_t id;
  95         int ret;
  96
  97         if (!l_given) {
  98                 para_printf(&aca->pbout, "%s\n", name);
  99                 return 0;
 100         }
 101         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 102         if (ret < 0) {
 103                 afs_error(aca, "cannot list %s\n", name);
 104                 return ret;
 105         }
 106         id = read_u32(obj.data);
 107         para_printf(&aca->pbout, "%u\t%s\n", id, name);
 108         return 1;
 109 }
 110
 111 static int com_lsblob_callback(const struct lls_command * const cmd,
 112                 struct osl_table *table, struct afs_callback_arg *aca)
 113 {
 114         bool i_given, r_given;
 115         struct pattern_match_data pmd = {
 116                 .table = table,
 117                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 118                 .match_col_num = BLOBCOL_NAME,
 119                 .data = aca,
 120                 .action = print_blob,
 121         };
 122         int ret;
 123
 124         ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
 125         pmd.lpr = aca->lpr;
 126         assert(ret >= 0);
 127         i_given = SERVER_CMD_OPT_GIVEN(LSMOOD, ID_SORT, aca->lpr);
 128         r_given = SERVER_CMD_OPT_GIVEN(LSMOOD, REVERSE, aca->lpr);
 129
 130         if (r_given)
 131                 pmd.pm_flags |= PM_REVERSE_LOOP;
 132         if (i_given)
 133                 pmd.loop_col_num = BLOBCOL_ID;
 134         else
 135                 pmd.loop_col_num = BLOBCOL_NAME;
 136         ret = for_each_matching_row(&pmd);
 137         if (ret < 0)
 138                 goto out;
 139         if (pmd.num_matches == 0 && lls_num_inputs(aca->lpr) > 0)
 140                 ret = -E_NO_MATCH;
 141 out:
 142         lls_free_parse_result(aca->lpr, cmd);
 143         return ret;
 144 }
 145
 146 static int com_lsblob(afs_callback *f, const struct lls_command * const cmd,
 147                 struct command_context *cc, struct lls_parse_result *lpr)
 148 {
 149         return send_lls_callback_request(f, cmd, lpr, cc);
 150 }
 151
 152 static int cat_blob(struct osl_table *table, struct osl_row *row,
 153                 __a_unused const char *name, void *data)
 154 {
 155         int ret = 0, ret2, fd = *(int *)data;
 156         struct osl_object obj;
 157
 158         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 159         if (ret < 0)
 160                 return (ret == osl(-E_OSL_EMPTY))? 0 : ret;
 161         assert(obj.size > 0);
 162         ret = pass_buffer_as_shm(fd, SBD_OUTPUT, obj.data, obj.size);
 163         ret2 = osl(osl_close_disk_object(&obj));
 164         return (ret < 0)? ret : ret2;
 165 }
 166
 167 static int com_catblob_callback(const struct lls_command * const cmd,
 168                 struct osl_table *table, struct afs_callback_arg *aca)
 169 {
 170         int ret;
 171         struct pattern_match_data pmd = {
 172                 .table = table,
 173                 .loop_col_num = BLOBCOL_NAME,
 174                 .match_col_num = BLOBCOL_NAME,
 175                 .pm_flags = PM_SKIP_EMPTY_NAME,
 176                 .data = &aca->fd,
 177                 .action = cat_blob
 178         };
 179
 180         ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
 181         assert(ret >= 0);
 182         pmd.lpr = aca->lpr;
 183         ret = for_each_matching_row(&pmd);
 184         if (ret < 0)
 185                 goto out;
 186         if (pmd.num_matches == 0)
 187                 ret = -E_NO_MATCH;
 188 out:
 189         lls_free_parse_result(aca->lpr, cmd);
 190         return ret;
 191 }
 192
 193 static int com_catblob(afs_callback *f, const struct lls_command * const cmd,
 194                 struct command_context *cc, struct lls_parse_result *lpr)
 195 {
 196         char *errctx;
 197         int ret = lls(lls_check_arg_count(lpr, 1, INT_MAX, &errctx));
 198
 199         if (ret < 0) {
 200                 send_errctx(cc, errctx);
 201                 return ret;
 202         }
 203         return send_lls_callback_request(f, cmd, lpr, cc);
 204 }
 205
 206 static int remove_blob(struct osl_table *table, struct osl_row *row,
 207                 const char *name, void *data)
 208 {
 209         struct afs_callback_arg *aca = data;
 210         int ret = osl(osl_del_row(table, row));
 211
 212         if (ret < 0) {
 213                 afs_error(aca, "cannot remove %s\n", name);
 214                 return ret;
 215         }
 216         return 1;
 217 }
 218
 219 static int com_rmblob_callback(const struct lls_command * const cmd,
 220                 struct osl_table *table, struct afs_callback_arg *aca)
 221 {
 222         int ret;
 223         struct pattern_match_data pmd = {
 224                 .table = table,
 225                 .loop_col_num = BLOBCOL_NAME,
 226                 .match_col_num = BLOBCOL_NAME,
 227                 .pm_flags = PM_SKIP_EMPTY_NAME,
 228                 .data = aca,
 229                 .action = remove_blob
 230         };
 231
 232         ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
 233         assert(ret >= 0);
 234         pmd.lpr = aca->lpr;
 235         ret = for_each_matching_row(&pmd);
 236         if (ret < 0)
 237                 goto out;
 238         if (pmd.num_matches == 0)
 239                 ret = -E_NO_MATCH;
 240         else {
 241                 para_printf(&aca->pbout, "removed %u blob(s)\n",
 242                         pmd.num_matches);
 243                 ret = afs_event(BLOB_REMOVE, NULL, table);
 244         }
 245 out:
 246         lls_free_parse_result(aca->lpr, cmd);
 247         return ret;
 248 }
 249
 250 static int com_rmblob(afs_callback *f, const struct lls_command * const cmd,
 251                 struct command_context *cc, struct lls_parse_result *lpr)
 252 {
 253         char *errctx;
 254         int ret = lls(lls_check_arg_count(lpr, 1, INT_MAX, &errctx));
 255
 256         if (ret < 0) {
 257                 send_errctx(cc, errctx);
 258                 return ret;
 259         }
 260         return send_lls_callback_request(f, cmd, lpr, cc);
 261 }
 262
 263 static int com_addblob_callback(__a_unused const struct lls_command * const cmd,
 264                 struct osl_table *table, struct afs_callback_arg *aca)
 265 {
 266         struct osl_object objs[NUM_BLOB_COLUMNS];
 267         char *name = aca->query.data;
 268         size_t name_len = strlen(name) + 1;
 269         uint32_t id = (uint32_t)-1; /* STFU, gcc */
 270         char id_buf[sizeof(id)];
 271         unsigned num_rows;
 272         int ret;
 273
 274         ret = osl(osl_get_num_rows(table, &num_rows));
 275         if (ret < 0)
 276                 goto out;
 277         if (!num_rows) { /* this is the first entry ever added */
 278                 /*
 279                  * Insert dummy row containing the next free ID. Since we are
 280                  * about to insert the first blob with ID 1, the next free ID
 281                  * will be 2.
 282                  */
 283                 id = 2U;
 284                 write_u32(id_buf, id);
 285                 objs[BLOBCOL_ID].data = id_buf;
 286                 objs[BLOBCOL_ID].size = sizeof(id_buf);
 287                 objs[BLOBCOL_NAME].data = "";
 288                 objs[BLOBCOL_NAME].size = 1;
 289                 objs[BLOBCOL_DEF].data = "";
 290                 objs[BLOBCOL_DEF].size = 1;
 291                 ret = osl(osl_add_row(table, objs));
 292                 if (ret < 0)
 293                         goto out;
 294         } else {
 295                 /* check if name already exists */
 296                 struct osl_row *row;
 297                 struct osl_object obj = {.data = name, .size = name_len};
 298                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 299                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 300                         goto out;
 301                 if (ret >= 0) { /* we already have a blob with this name */
 302                         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 303                         if (ret < 0)
 304                                 goto out;
 305                         id = read_u32(obj.data);
 306                         obj.data = name + name_len;
 307                         obj.size = aca->query.size - name_len;
 308                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 309                         goto out;
 310                 }
 311                 /* new blob, get id of the dummy row and increment it */
 312                 obj.data = "";
 313                 obj.size = 1;
 314                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 315                 if (ret < 0)
 316                         goto out;
 317                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 318                 if (ret < 0)
 319                         goto out;
 320                 id = read_u32(obj.data) + 1;
 321                 write_u32(id_buf, id);
 322                 obj.data = &id_buf;
 323                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 324                 if (ret < 0)
 325                         goto out;
 326         }
 327         id--;
 328         write_u32(id_buf, id);
 329         objs[BLOBCOL_ID].data = &id_buf;
 330         objs[BLOBCOL_ID].size = sizeof(id_buf);
 331         objs[BLOBCOL_NAME].data = name;
 332         objs[BLOBCOL_NAME].size = name_len;
 333         objs[BLOBCOL_DEF].data = name + name_len;
 334         objs[BLOBCOL_DEF].size = aca->query.size - name_len;
 335         ret = osl(osl_add_row(table, objs));
 336         if (ret < 0)
 337                 goto out;
 338         ret = afs_event(BLOB_ADD, NULL, table);
 339 out:
 340         if (ret < 0)
 341                 afs_error(aca, "cannot add %s\n", name);
 342         else
 343                 para_printf(&aca->pbout, "added %s as id %u\n", name, id);
 344         return ret;
 345 }
 346
 347 /* Write input from fd to dynamically allocated buffer, but maximal 10M. */
 348 static int fd2buf(struct stream_cipher_context *scc, struct osl_object *obj)
 349 {
 350         size_t max_size = 10 * 1024 * 1024;
 351         int ret;
 352         struct iovec iov;
 353
 354         obj->data = NULL;
 355         obj->size = 0;
 356 again:
 357         do {
 358                 ret = recv_sb(scc, SBD_BLOB_DATA, max_size, &iov);
 359         } while (ret == 0);
 360
 361         if (ret < 0) {
 362                 free(obj->data);
 363                 obj->data = NULL;
 364                 obj->size = 0;
 365                 return ret;
 366         }
 367         if (iov.iov_len == 0) /* end of blob */
 368                 return 1;
 369         if (!obj->data) {
 370                 obj->data = iov.iov_base;
 371                 obj->size = iov.iov_len;
 372         } else {
 373                 obj->data = para_realloc(obj->data, obj->size + iov.iov_len);
 374                 memcpy(obj->data + obj->size, iov.iov_base, iov.iov_len);
 375                 obj->size += iov.iov_len;
 376                 free(iov.iov_base);
 377                 max_size -= iov.iov_len;
 378         }
 379         goto again;
 380         return 1;
 381 }
 382
 383 /*
 384  * Read blob from a file descriptor and send it to afs.
 385  *
 386  * This function is called from the addblob command handlers to instruct the
 387  * afs process to store the input in a blob table. Input is read and decrypted
 388  * from the file descriptor given by cc and appended to a buffer which also contains
 389  * the name of the blob to create. The combined buffer is made available to the
 390  * afs process via the callback method.
 391  */
 392 static int stdin_command(struct command_context *cc,
 393                 struct lls_parse_result *lpr, afs_callback *f)
 394 {
 395         struct osl_object query, stdin_obj;
 396         int ret;
 397         size_t len = strlen(lls_input(0, lpr));
 398
 399         ret = send_sb(&cc->scc, NULL, 0, SBD_AWAITING_DATA, false);
 400         if (ret < 0)
 401                 return ret;
 402         ret = fd2buf(&cc->scc, &stdin_obj);
 403         if (ret < 0)
 404                 return ret;
 405         query.size = len + 1 + stdin_obj.size;
 406         query.data = alloc(query.size);
 407         memcpy(query.data, lls_input(0, lpr), len + 1);
 408         if (stdin_obj.size > 0)
 409                 memcpy((char *)query.data + len + 1, stdin_obj.data,
 410                         stdin_obj.size);
 411         free(stdin_obj.data);
 412         ret = send_callback_request(f, &query, afs_cb_result_handler, cc);
 413         free(query.data);
 414         return ret;
 415 }
 416
 417 static int com_addblob(afs_callback *f, __a_unused const struct lls_command * const cmd,
 418                 struct command_context *cc, struct lls_parse_result *lpr)
 419 {
 420         char *errctx;
 421         int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
 422
 423         if (ret < 0) {
 424                 send_errctx(cc, errctx);
 425                 return ret;
 426         }
 427         if (!lls_input(0, lpr)[0]) /* empty name is reserved for the dummy row */
 428                 return -E_BLOB_SYNTAX;
 429         return stdin_command(cc, lpr, f);
 430 }
 431
 432 static int com_mvblob_callback(const struct lls_command * const cmd,
 433                 struct osl_table *table, struct afs_callback_arg *aca)
 434 {
 435         const char *src, *dest;
 436         struct osl_object obj;
 437         struct osl_row *row;
 438         int ret;
 439
 440         ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
 441         assert(ret >= 0);
 442         src = lls_input(0, aca->lpr);
 443         dest = lls_input(1, aca->lpr);
 444         obj.data = (char *)src;
 445         obj.size = strlen(src) + 1;
 446         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 447
 448         if (ret < 0) {
 449                 afs_error(aca, "cannot find source blob %s\n", src);
 450                 goto out;
 451         }
 452         obj.data = (char *)dest;
 453         obj.size = strlen(dest) + 1;
 454         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 455         if (ret < 0) {
 456                 afs_error(aca, "cannot rename blob %s to %s\n", src, dest);
 457                 goto out;
 458         }
 459         ret = afs_event(BLOB_RENAME, NULL, table);
 460 out:
 461         lls_free_parse_result(aca->lpr, cmd);
 462         return ret;
 463 }
 464
 465 static int com_mvblob(afs_callback *f, const struct lls_command * const cmd,
 466                 struct command_context *cc, struct lls_parse_result *lpr)
 467 {
 468         char *errctx;
 469         int ret = lls(lls_check_arg_count(lpr, 2, 2, &errctx));
 470
 471         if (ret < 0) {
 472                 send_errctx(cc, errctx);
 473                 return ret;
 474         }
 475         return send_lls_callback_request(f, cmd, lpr, cc);
 476 }
 477
 478 #define DEFINE_BLOB_COMMAND(cmd_name, c_cmd_name, table_name, short_name, c_short_name) \
 479         static int com_ ## cmd_name ## short_name ## _callback(struct afs_callback_arg *aca) \
 480         { \
 481                 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(c_cmd_name ## c_short_name); \
 482                 return com_ ## cmd_name ## blob_callback(cmd, table_name ## _table, aca); \
 483         } \
 484         static int com_ ## cmd_name ## short_name(struct command_context *cc, struct lls_parse_result *lpr) \
 485         { \
 486                 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(c_cmd_name ## c_short_name); \
 487                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## short_name ## _callback, cmd, cc, lpr); \
 488         } \
 489         EXPORT_SERVER_CMD_HANDLER(cmd_name ## short_name);
 490
 491 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 492                 char **name)
 493 {
 494         struct osl_row *row;
 495         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 496         int ret;
 497
 498         if (name)
 499                 *name = NULL;
 500         if (!id)
 501                 return 1;
 502         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 503         if (ret < 0)
 504                 return ret;
 505         ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 506         if (ret < 0)
 507                 return ret;
 508         if (*(char *)obj.data == '\0')
 509                 return -E_DUMMY_ROW;
 510         if (name)
 511                 *name = (char *)obj.data;
 512         return 1;
 513 }
 514
 515 /** Define the \p get_name_by_id function for this blob type. */
 516 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 517         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 518         { \
 519                 return blob_get_name_by_id(table_name ## _table, id, name); \
 520         }
 521
 522 static int blob_get_def_by_name(struct osl_table *table, const char *name,
 523                 struct osl_object *def)
 524 {
 525         struct osl_row *row;
 526         struct osl_object obj = {.data = (void *)name, .size = strlen(name) + 1};
 527         int ret;
 528
 529         def->data = NULL;
 530         if (!*name)
 531                 return 1;
 532         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 533         if (ret < 0)
 534                 return ret;
 535         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 536 }
 537
 538 /** Define the \p get_def_by_id function for this blob type. */
 539 #define DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix) \
 540         int cmd_prefix ## _get_def_by_name(const char *name, struct osl_object *def) \
 541         { \
 542                 return blob_get_def_by_name(table_name ## _table, name, def); \
 543         }
 544
 545 static int blob_get_def_by_id(struct osl_table *table, uint32_t id,
 546                 struct osl_object *def)
 547 {
 548         struct osl_row *row;
 549         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 550         int ret;
 551
 552         def->data = NULL;
 553         if (!id)
 554                 return 1;
 555         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 556         if (ret < 0)
 557                 return ret;
 558         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 559 }
 560
 561 /** Define the \p get_def_by_id function for this blob type. */
 562 #define DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix) \
 563         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def) \
 564         { \
 565                 return blob_get_def_by_id(table_name ## _table, id, def); \
 566         }
 567
 568 static int blob_get_name_and_def_by_row(struct osl_table *table,
 569                 const struct osl_row *row, char **name, struct osl_object *def)
 570 {
 571         struct osl_object obj;
 572         int ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 573
 574         if (ret < 0)
 575                 return ret;
 576         *name = obj.data;
 577         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 578 }
 579 /** Define the \p get_name_and_def_by_row function for this blob type. */
 580 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 581         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 582                 char **name, struct osl_object *def) \
 583         { \
 584                 return blob_get_name_and_def_by_row(table_name ## _table, \
 585                         row, name, def); \
 586         }
 587
 588 /** Define the \p close function for this blob type. */
 589 #define DEFINE_BLOB_CLOSE(table_name) \
 590         static void table_name ## _close(void) \
 591         { \
 592                 osl_close_table(table_name ## _table, OSL_MARK_CLEAN); \
 593                 table_name ## _table = NULL; \
 594         }
 595
 596 /** Define the \p create function for this blob type. */
 597 #define DEFINE_BLOB_CREATE(table_name) \
 598         static int table_name ## _create(const char *dir) \
 599         { \
 600                 table_name ## _table_desc.dir = dir; \
 601                 return osl(osl_create_table(&table_name ## _table_desc)); \
 602         }
 603
 604 static int blob_open(struct osl_table **table,
 605                 struct osl_table_description *desc,
 606                 const char *dir)
 607 {
 608         int ret;
 609
 610         desc->dir = dir;
 611         ret = osl(osl_open_table(desc, table));
 612         if (ret >= 0)
 613                 return ret;
 614         *table = NULL;
 615         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 616                 return 1;
 617         return ret;
 618 }
 619
 620 #define DEFINE_BLOB_OPEN(table_name) \
 621         static int table_name ## _open(const char *dir) \
 622         { \
 623                 return blob_open(&table_name ## _table, \
 624                         &table_name ## _table_desc, dir); \
 625         }
 626
 627 /** Blob tables map integers to blobs. */
 628 #define DEFINE_BLOB_AFS_TABLE_OPS(table_name) \
 629         const struct afs_table_operations table_name ## _ops = { \
 630                 .open = table_name ## _open, \
 631                 .close = table_name ## _close, \
 632                 .create = table_name ## _create, \
 633                 .event_handler = table_name ##_event_handler, \
 634         };
 635
 636 /** Define all functions for this blob type. */
 637 #define DEFINE_BLOB_FUNCTIONS(table_name, short_name, c_short_name) \
 638         DEFINE_BLOB_OPEN(table_name) \
 639         DEFINE_BLOB_CLOSE(table_name) \
 640         DEFINE_BLOB_CREATE(table_name) \
 641         DEFINE_BLOB_AFS_TABLE_OPS(table_name) \
 642         DEFINE_BLOB_COMMAND(ls, LS, table_name, short_name, c_short_name) \
 643         DEFINE_BLOB_COMMAND(cat, CAT, table_name, short_name, c_short_name) \
 644         DEFINE_BLOB_COMMAND(add, ADD, table_name, short_name, c_short_name) \
 645         DEFINE_BLOB_COMMAND(rm, RM, table_name, short_name, c_short_name) \
 646         DEFINE_BLOB_COMMAND(mv, MV, table_name, short_name, c_short_name) \
 647         DEFINE_GET_NAME_BY_ID(table_name, short_name); \
 648         DEFINE_GET_DEF_BY_ID(table_name, short_name); \
 649         DEFINE_GET_DEF_BY_NAME(table_name, short_name); \
 650         DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, short_name); \
 651
 652 /* doxygen isn't smart enough to recognize these */
 653 /** \cond blob_function */
 654 DEFINE_BLOB_FUNCTIONS(lyrics, lyr, LYR);
 655 DEFINE_BLOB_FUNCTIONS(images, img, IMG);
 656 DEFINE_BLOB_FUNCTIONS(moods, mood, MOOD);
 657 DEFINE_BLOB_FUNCTIONS(playlists, pl, PL);
 658 /** \endcond blob_function */