blob.c

   1 /*
   2  * Copyright (C) 2007-2012 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file blob.c Macros and functions for blob handling. */
   8
   9 #include <regex.h>
  10 #include <fnmatch.h>
  11 #include <osl.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "crypt.h"
  16 #include "string.h"
  17 #include "afh.h"
  18 #include "afs.h"
  19 #include "ipc.h"
  20 #include "portable_io.h"
  21 #include "command.h"
  22
  23 /**
  24  * Compare two osl objects pointing to unsigned integers of 32 bit size.
  25  *
  26  * \param obj1 Pointer to the first integer.
  27  * \param obj2 Pointer to the second integer.
  28  *
  29  * \return The values required for an osl compare function.
  30  *
  31  * \sa osl_compare_func, osl_hash_compare().
  32  */
  33 static int uint32_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  34 {
  35         uint32_t d1 = read_u32((const char *)obj1->data);
  36         uint32_t d2 = read_u32((const char *)obj2->data);
  37
  38         if (d1 < d2)
  39                 return 1;
  40         if (d1 > d2)
  41                 return -1;
  42         return 0;
  43 }
  44
  45 static struct osl_column_description blob_cols[] = {
  46         [BLOBCOL_ID] = {
  47                 .storage_type = OSL_MAPPED_STORAGE,
  48                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  49                 .name = "id",
  50                 .data_size = 4,
  51                 .compare_function = uint32_compare
  52         },
  53         [BLOBCOL_NAME] = {
  54                 .storage_type = OSL_MAPPED_STORAGE,
  55                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  56                 .name = "name",
  57                 .compare_function = string_compare
  58         },
  59         [BLOBCOL_DEF] = {
  60                 .storage_type = OSL_DISK_STORAGE,
  61                 .storage_flags = 0,
  62                 .name = "definition"
  63         }
  64 };
  65
  66 /** Define an osl table description for a blob table. */
  67 #define DEFINE_BLOB_TABLE_DESC(table_name) \
  68         struct osl_table_description table_name ## _table_desc = { \
  69                 .name = #table_name, \
  70                 .num_columns = NUM_BLOB_COLUMNS, \
  71                 .flags = OSL_LARGE_TABLE, \
  72                 .column_descriptions = blob_cols \
  73         };
  74
  75 /** Define a pointer to an osl blob table with a canonical name. */
  76 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
  77
  78
  79 /** Define a blob table. */
  80 #define INIT_BLOB_TABLE(table_name) \
  81         DEFINE_BLOB_TABLE_DESC(table_name); \
  82         DEFINE_BLOB_TABLE_PTR(table_name);
  83
  84 /* doxygen isn't smart enough to recognize these */
  85 /** \cond blob_table */
  86 INIT_BLOB_TABLE(lyrics);
  87 INIT_BLOB_TABLE(images);
  88 INIT_BLOB_TABLE(moods);
  89 INIT_BLOB_TABLE(playlists);
  90 /** \endcond blob_table */
  91
  92 /** Flags that may be passed to the \p ls functions of each blob  type. */
  93 enum blob_ls_flags {
  94         /** List both id and name. */
  95         BLOB_LS_FLAG_LONG = 1,
  96         /** Reverse sort order. */
  97         BLOB_LS_FLAG_REVERSE = 2,
  98         /** Sort by id instead of name. */
  99         BLOB_LS_FLAG_SORT_BY_ID = 4,
 100 };
 101
 102 /** Structure passed to the \p print_blob function. */
 103 struct lsblob_action_data {
 104         /** The flags given at the command line. */
 105         uint32_t flags;
 106         /** Message buffer. */
 107         struct para_buffer pb;
 108 };
 109
 110 static int print_blob(struct osl_table *table, struct osl_row *row,
 111                 const char *name, void *data)
 112 {
 113         struct lsblob_action_data *lbad = data;
 114         struct osl_object obj;
 115         uint32_t id;
 116         int ret;
 117
 118         if (!(lbad->flags & BLOB_LS_FLAG_LONG))
 119                 return para_printf(&lbad->pb, "%s\n", name);
 120         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 121         if (ret < 0) {
 122                 para_printf(&lbad->pb, "%s: %s\n", name, para_strerror(-ret));
 123                 return ret;
 124         }
 125         id = *(uint32_t *)obj.data;
 126         return para_printf(&lbad->pb, "%u\t%s\n", id, name);
 127 }
 128
 129 static void com_lsblob_callback(struct osl_table *table,
 130                 int fd, const struct osl_object *query)
 131 {
 132         struct lsblob_action_data lbad = {
 133                 .flags = *(uint32_t *)query->data,
 134                 .pb = {
 135                         .max_size = shm_get_shmmax(),
 136                         .private_data = &fd,
 137                         .max_size_handler = pass_buffer_as_shm
 138                 }
 139         };
 140         struct pattern_match_data pmd = {
 141                 .table = table,
 142                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
 143                         .size = query->size - sizeof(uint32_t)},
 144                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 145                 .match_col_num = BLOBCOL_NAME,
 146                 .data = &lbad,
 147                 .action = print_blob,
 148         };
 149         int ret;
 150
 151         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
 152                 pmd.pm_flags |= PM_REVERSE_LOOP;
 153         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 154                 pmd.loop_col_num = BLOBCOL_NAME;
 155         else
 156                 pmd.loop_col_num = BLOBCOL_ID;
 157         ret = for_each_matching_row(&pmd);
 158         if (ret < 0)
 159                 para_printf(&lbad.pb, "%s\n", para_strerror(-ret));
 160         else if (pmd.num_matches == 0 && pmd.patterns.size > 0)
 161                 para_printf(&lbad.pb, "no matches\n");
 162         if (lbad.pb.offset)
 163                 pass_buffer_as_shm(lbad.pb.buf, lbad.pb.offset, &fd);
 164         free(lbad.pb.buf);
 165 }
 166
 167 static int com_lsblob(callback_function *f, struct command_context *cc)
 168 {
 169         uint32_t flags = 0;
 170         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 171         int i;
 172
 173         for (i = 1; i < cc->argc; i++) {
 174                 const char *arg = cc->argv[i];
 175                 if (arg[0] != '-')
 176                         break;
 177                 if (!strcmp(arg, "--")) {
 178                         i++;
 179                         break;
 180                 }
 181                 if (!strcmp(arg, "-l")) {
 182                         flags |= BLOB_LS_FLAG_LONG;
 183                         continue;
 184                 }
 185                 if (!strcmp(arg, "-i")) {
 186                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 187                         continue;
 188                 }
 189                 if (!strcmp(arg, "-r")) {
 190                         flags |= BLOB_LS_FLAG_REVERSE;
 191                         continue;
 192                 }
 193                 break;
 194         }
 195 //      if (argc > i)
 196 //              return -E_BLOB_SYNTAX;
 197         return send_option_arg_callback_request(&options, cc->argc - i,
 198                 cc->argv + i, f, sc_send_result, cc);
 199 }
 200
 201 static int cat_blob(struct osl_table *table, struct osl_row *row,
 202                 __a_unused const char *name, void *data)
 203 {
 204         int ret = 0, ret2;
 205         struct osl_object obj;
 206
 207         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 208         if (ret < 0)
 209                 return (ret == osl(-E_OSL_EMPTY))? 0 : ret;
 210         assert(obj.size > 0);
 211         ret = pass_buffer_as_shm(obj.data, obj.size, data);
 212         ret2 = osl(osl_close_disk_object(&obj));
 213         return (ret < 0)? ret : ret2;
 214 }
 215
 216 static void com_catblob_callback(struct osl_table *table, int fd,
 217                 const struct osl_object *query)
 218 {
 219         struct pattern_match_data pmd = {
 220                 .table = table,
 221                 .patterns = *query,
 222                 .loop_col_num = BLOBCOL_NAME,
 223                 .match_col_num = BLOBCOL_NAME,
 224                 .pm_flags = PM_SKIP_EMPTY_NAME,
 225                 .data = &fd,
 226                 .action = cat_blob
 227         };
 228         for_each_matching_row(&pmd);
 229         if (pmd.num_matches == 0) {
 230                 char err_msg[] = "no matches\n";
 231                 pass_buffer_as_shm(err_msg, sizeof(err_msg), &fd);
 232         }
 233 }
 234
 235 static int com_catblob(callback_function *f, struct command_context *cc)
 236 {
 237         if (cc->argc < 2)
 238                 return -E_BLOB_SYNTAX;
 239         return send_standard_callback_request(cc->argc - 1, cc->argv + 1, f,
 240                 sc_send_result, cc);
 241 }
 242
 243 /** Used for removing rows from a blob table. */
 244 struct rmblob_data {
 245         /** Message buffer. */
 246         struct para_buffer pb;
 247 };
 248
 249 static int remove_blob(struct osl_table *table, struct osl_row *row,
 250                 const char *name, void *data)
 251 {
 252         struct rmblob_data *rmbd = data;
 253         int ret = osl(osl_del_row(table, row));
 254         if (ret < 0) {
 255                 para_printf(&rmbd->pb, "%s: %s\n", name, para_strerror(-ret));
 256                 return ret;
 257         }
 258         return 1;
 259 }
 260
 261 static void com_rmblob_callback(struct osl_table *table, int fd,
 262                 const struct osl_object *query)
 263 {
 264         int ret, ret2 = 0;
 265         struct rmblob_data rmbd = {
 266                 .pb = {
 267                         .max_size = shm_get_shmmax(),
 268                         .private_data = &fd,
 269                         .max_size_handler = pass_buffer_as_shm
 270                 }
 271         };
 272         struct pattern_match_data pmd = {
 273                 .table = table,
 274                 .patterns = *query,
 275                 .loop_col_num = BLOBCOL_NAME,
 276                 .match_col_num = BLOBCOL_NAME,
 277                 .pm_flags = PM_SKIP_EMPTY_NAME,
 278                 .data = &rmbd,
 279                 .action = remove_blob
 280         };
 281         ret = for_each_matching_row(&pmd);
 282         if (ret < 0) {
 283                 ret2 = para_printf(&rmbd.pb, "%s\n", para_strerror(-ret));
 284                 if (ret2 < 0)
 285                         goto out;
 286         }
 287         if (pmd.num_matches == 0)
 288                 ret2 = para_printf(&rmbd.pb, "no matches, nothing removed\n");
 289         else {
 290                 ret2 = para_printf(&rmbd.pb, "removed %d blobs\n", pmd.num_matches);
 291                 afs_event(BLOB_RENAME, NULL, table);
 292         }
 293 out:
 294         if (ret2 >= 0 && rmbd.pb.offset)
 295                 pass_buffer_as_shm(rmbd.pb.buf, rmbd.pb.offset, &fd);
 296         free(rmbd.pb.buf);
 297 }
 298
 299 static int com_rmblob(callback_function *f, struct command_context *cc)
 300 {
 301         if (cc->argc < 2)
 302                 return -E_MOOD_SYNTAX;
 303         return send_option_arg_callback_request(NULL, cc->argc - 1, cc->argv + 1, f,
 304                 sc_send_result, cc);
 305 }
 306
 307 static void com_addblob_callback(struct osl_table *table, __a_unused int fd,
 308                 const struct osl_object *query)
 309 {
 310         struct osl_object objs[NUM_BLOB_COLUMNS];
 311         char *name = query->data;
 312         size_t name_len = strlen(name) + 1;
 313         uint32_t id;
 314         unsigned num_rows;
 315         int ret;
 316
 317         ret = osl(osl_get_num_rows(table, &num_rows));
 318         if (ret < 0)
 319                 goto out;
 320         if (!num_rows) { /* this is the first entry ever added */
 321                 /* insert dummy row containing the id */
 322                 id = 2; /* this entry will be entry #1, so 2 is the next */
 323                 objs[BLOBCOL_ID].data = &id;
 324                 objs[BLOBCOL_ID].size = sizeof(id);
 325                 objs[BLOBCOL_NAME].data = "";
 326                 objs[BLOBCOL_NAME].size = 1;
 327                 objs[BLOBCOL_DEF].data = "";
 328                 objs[BLOBCOL_DEF].size = 1;
 329                 ret = osl(osl_add_row(table, objs));
 330                 if (ret < 0)
 331                         goto out;
 332         } else {
 333                 /* check if name already exists */
 334                 struct osl_row *row;
 335                 struct osl_object obj = {.data = name, .size = name_len};
 336                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 337                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 338                         goto out;
 339                 if (ret >= 0) { /* we already have a blob with this name */
 340                         obj.data = name + name_len;
 341                         obj.size = query->size - name_len;
 342                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 343                         goto out;
 344                 }
 345                 /* new blob, get id of the dummy row and increment it */
 346                 obj.data = "";
 347                 obj.size = 1;
 348                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 349                 if (ret < 0)
 350                         goto out;
 351                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 352                 if (ret < 0)
 353                         goto out;
 354                 id = *(uint32_t *)obj.data + 1;
 355                 obj.data = &id;
 356                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 357                 if (ret < 0)
 358                         goto out;
 359         }
 360         id--;
 361         objs[BLOBCOL_ID].data = &id;
 362         objs[BLOBCOL_ID].size = sizeof(id);
 363         objs[BLOBCOL_NAME].data = name;
 364         objs[BLOBCOL_NAME].size = name_len;
 365         objs[BLOBCOL_DEF].data = name + name_len;
 366         objs[BLOBCOL_DEF].size = query->size - name_len;
 367         ret = osl(osl_add_row(table, objs));
 368         if (ret < 0)
 369                 goto out;
 370         afs_event(BLOB_ADD, NULL, table);
 371 out:
 372         if (ret < 0)
 373                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 374 }
 375
 376 /*
 377  * write input from fd to dynamically allocated buffer,
 378  * but maximal max_size byte.
 379  */
 380 static int fd2buf(struct stream_cipher_context *scc, unsigned max_size, struct osl_object *obj)
 381 {
 382         const size_t chunk_size = 1024;
 383         size_t size = 2048, received = 0;
 384         int ret;
 385         char *buf = para_malloc(size);
 386
 387         for (;;) {
 388                 ret = sc_recv_bin_buffer(scc, buf + received, chunk_size);
 389                 if (ret <= 0)
 390                         break;
 391                 received += ret;
 392                 if (received + chunk_size >= size) {
 393                         size *= 2;
 394                         ret = -E_INPUT_TOO_LARGE;
 395                         if (size > max_size)
 396                                 break;
 397                         buf = para_realloc(buf, size);
 398                 }
 399         }
 400         obj->data = buf;
 401         obj->size = received;
 402         if (ret < 0)
 403                 free(buf);
 404         return ret;
 405 }
 406
 407 /*
 408  * Read data from a file descriptor, and send it to the afs process.
 409  *
 410  * \param scc crypt context containing the file descriptor to read data from.
 411  * \param arg_obj Pointer to the arguments to \a f.
 412  * \param f The callback function.
 413  * \param max_len Don't read more than that many bytes from stdin.
 414  * \param result_handler See \ref send_callback_request.
 415  * \param private_result_data See \ref send_callback_request.
 416  *
 417  * This function is used by commands that wish to let para_server store
 418  * arbitrary data specified by the user (for instance the add_blob family of
 419  * commands). First, at most \a max_len bytes are read and decrypted from the
 420  * file descriptor given by \a scc. The result is concatenated with the buffer
 421  * given by \a arg_obj, and the combined buffer is made available to the afs
 422  * process via the callback method. See \ref send_callback_request for details.
 423  *
 424  * \return Negative on errors, the return value of the underlying call to
 425  * send_callback_request() otherwise.
 426  */
 427 static int stdin_command(struct command_context *cc, struct osl_object *arg_obj,
 428                 callback_function *f, unsigned max_len,
 429                 callback_result_handler *result_handler,
 430                 void *private_result_data)
 431 {
 432         struct osl_object query, stdin_obj;
 433         int ret;
 434
 435         ret = sc_send_buffer(&cc->scc, AWAITING_DATA_MSG);
 436         if (ret < 0)
 437                 return ret;
 438         ret = fd2buf(&cc->scc, max_len, &stdin_obj);
 439         if (ret < 0)
 440                 return ret;
 441         query.size = arg_obj->size + stdin_obj.size;
 442         query.data = para_malloc(query.size);
 443         memcpy(query.data, arg_obj->data, arg_obj->size);
 444         memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
 445         free(stdin_obj.data);
 446         ret = send_callback_request(f, &query, result_handler, private_result_data);
 447         free(query.data);
 448         return ret;
 449 }
 450
 451 static int com_addblob(callback_function *f, struct command_context *cc)
 452 {
 453         struct osl_object arg_obj;
 454
 455         if (cc->argc != 2)
 456                 return -E_BLOB_SYNTAX;
 457         if (!*cc->argv[1]) /* empty name is reserved for the dummy row */
 458                 return -E_BLOB_SYNTAX;
 459         arg_obj.size = strlen(cc->argv[1]) + 1;
 460         arg_obj.data = (char *)cc->argv[1];
 461         return stdin_command(cc, &arg_obj, f, 10 * 1024 * 1024, NULL, NULL);
 462 }
 463
 464 /* FIXME: Print output to client, not to log file */
 465 static void com_mvblob_callback(struct osl_table *table, __a_unused int fd,
 466                 const struct osl_object *query)
 467 {
 468         char *src = (char *) query->data;
 469         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 470         char *dest = src + obj.size;
 471         struct osl_row *row;
 472         int ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 473
 474         if (ret < 0)
 475                 goto out;
 476         obj.data = dest;
 477         obj.size = strlen(dest) + 1;
 478         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 479         if (ret < 0)
 480                 goto out;
 481         afs_event(BLOB_RENAME, NULL, table);
 482 out:
 483         if (ret < 0)
 484                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 485 }
 486
 487 static int com_mvblob(callback_function *f, struct command_context *cc)
 488 {
 489         if (cc->argc != 3)
 490                 return -E_MOOD_SYNTAX;
 491         return send_option_arg_callback_request(NULL, cc->argc - 1,
 492                 cc->argv + 1, f, NULL, NULL);
 493 }
 494
 495 #define DEFINE_BLOB_COMMAND(cmd_name, table_name, cmd_prefix) \
 496         static void com_ ## cmd_name ## cmd_prefix ## _callback(int fd, const struct osl_object *query) \
 497         { \
 498                 return com_ ## cmd_name ## blob_callback(table_name ## _table, fd, query); \
 499         } \
 500         int com_ ## cmd_name ## cmd_prefix(struct command_context *cc) \
 501         { \
 502                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, cc); \
 503         }
 504
 505 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 506                 char **name)
 507 {
 508         struct osl_row *row;
 509         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 510         int ret;
 511
 512         *name = NULL;
 513         if (!id)
 514                 return 1;
 515         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 516         if (ret < 0)
 517                 return ret;
 518         ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 519         if (ret < 0)
 520                 return ret;
 521         *name = (char *)obj.data;
 522         return 1;
 523 }
 524
 525 /** Define the \p get_name_by_id function for this blob type. */
 526 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 527         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 528         { \
 529                 return blob_get_name_by_id(table_name ## _table, id, name); \
 530         }
 531
 532
 533 static int blob_get_def_by_name(struct osl_table *table, char *name,
 534                 struct osl_object *def)
 535 {
 536         struct osl_row *row;
 537         struct osl_object obj = {.data = name, .size = strlen(name) + 1};
 538         int ret;
 539
 540         def->data = NULL;
 541         if (!*name)
 542                 return 1;
 543         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 544         if (ret < 0)
 545                 return ret;
 546         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 547 }
 548
 549 /** Define the \p get_def_by_id function for this blob type. */
 550 #define DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix) \
 551         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def) \
 552         { \
 553                 return blob_get_def_by_name(table_name ## _table, name, def); \
 554         }
 555
 556 static int blob_get_def_by_id(struct osl_table *table, uint32_t id,
 557                 struct osl_object *def)
 558 {
 559         struct osl_row *row;
 560         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 561         int ret;
 562
 563         def->data = NULL;
 564         if (!id)
 565                 return 1;
 566         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 567         if (ret < 0)
 568                 return ret;
 569         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 570 }
 571
 572 /** Define the \p get_def_by_id function for this blob type. */
 573 #define DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix) \
 574         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def) \
 575         { \
 576                 return blob_get_def_by_id(table_name ## _table, id, def); \
 577         }
 578
 579 static int blob_get_name_and_def_by_row(struct osl_table *table,
 580                 const struct osl_row *row, char **name, struct osl_object *def)
 581 {
 582         struct osl_object obj;
 583         int ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 584         if (ret < 0)
 585                 return ret;
 586         *name = obj.data;
 587         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 588 }
 589 /** Define the \p get_name_and_def_by_row function for this blob type. */
 590 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 591         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 592                 char **name, struct osl_object *def) \
 593         { \
 594                 return blob_get_name_and_def_by_row(table_name ## _table, \
 595                         row, name, def); \
 596         }
 597
 598 /** Define the \p close function for this blob type. */
 599 #define DEFINE_BLOB_CLOSE(table_name) \
 600         static void table_name ## _close(void) \
 601         { \
 602                 osl_close_table(table_name ## _table, OSL_MARK_CLEAN); \
 603                 table_name ## _table = NULL; \
 604         }
 605
 606 /** Define the \p create function for this blob type. */
 607 #define DEFINE_BLOB_CREATE(table_name) \
 608         static int table_name ## _create(const char *dir) \
 609         { \
 610                 table_name ## _table_desc.dir = dir; \
 611                 return osl_create_table(&table_name ## _table_desc); \
 612         }
 613
 614 static int blob_open(struct osl_table **table,
 615                 struct osl_table_description *desc,
 616                 const char *dir)
 617 {
 618         int ret;
 619         desc->dir = dir;
 620         ret = osl(osl_open_table(desc, table));
 621         if (ret >= 0)
 622                 return ret;
 623         *table = NULL;
 624         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 625                 return 1;
 626         return ret;
 627 }
 628
 629 #define DEFINE_BLOB_OPEN(table_name) \
 630         static int table_name ## _open(const char *dir) \
 631         { \
 632                 return blob_open(&table_name ## _table, \
 633                         &table_name ## _table_desc, dir); \
 634         }
 635
 636
 637 /** Define the \p init function for this blob type. */
 638 #define DEFINE_BLOB_INIT(table_name) \
 639         void table_name ## _init(struct afs_table *t) \
 640         { \
 641                 t->open = table_name ## _open; \
 642                 t->close = table_name ## _close; \
 643                 t->create = table_name ## _create;\
 644                 t->event_handler = table_name ##_event_handler; \
 645                 table_name ## _table = NULL; \
 646         }
 647
 648
 649 /** Define all functions for this blob type. */
 650 #define DEFINE_BLOB_FUNCTIONS(table_name, cmd_prefix) \
 651         DEFINE_BLOB_OPEN(table_name) \
 652         DEFINE_BLOB_CLOSE(table_name) \
 653         DEFINE_BLOB_CREATE(table_name) \
 654         DEFINE_BLOB_INIT(table_name) \
 655         DEFINE_BLOB_COMMAND(ls, table_name, cmd_prefix) \
 656         DEFINE_BLOB_COMMAND(cat, table_name, cmd_prefix) \
 657         DEFINE_BLOB_COMMAND(add, table_name, cmd_prefix) \
 658         DEFINE_BLOB_COMMAND(rm, table_name, cmd_prefix) \
 659         DEFINE_BLOB_COMMAND(mv, table_name, cmd_prefix) \
 660         DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix); \
 661         DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix); \
 662         DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix); \
 663         DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix); \
 664
 665 /* doxygen isn't smart enough to recognize these */
 666 /** \cond blob_function */
 667 DEFINE_BLOB_FUNCTIONS(lyrics, lyr);
 668 DEFINE_BLOB_FUNCTIONS(images, img);
 669 DEFINE_BLOB_FUNCTIONS(moods, mood);
 670 DEFINE_BLOB_FUNCTIONS(playlists, pl);
 671 /** \endcond blob_function */