blob.c

   1 /*
   2  * Copyright (C) 2007-2011 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
  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  * \sa osl_compare_func, osl_hash_compare().
  31  */
  32 static int uint32_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  33 {
  34         uint32_t d1 = read_u32((const char *)obj1->data);
  35         uint32_t d2 = read_u32((const char *)obj2->data);
  36
  37         if (d1 < d2)
  38                 return 1;
  39         if (d1 > d2)
  40                 return -1;
  41         return 0;
  42 }
  43
  44 static struct osl_column_description blob_cols[] = {
  45         [BLOBCOL_ID] = {
  46                 .storage_type = OSL_MAPPED_STORAGE,
  47                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  48                 .name = "id",
  49                 .data_size = 4,
  50                 .compare_function = uint32_compare
  51         },
  52         [BLOBCOL_NAME] = {
  53                 .storage_type = OSL_MAPPED_STORAGE,
  54                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  55                 .name = "name",
  56                 .compare_function = string_compare
  57         },
  58         [BLOBCOL_DEF] = {
  59                 .storage_type = OSL_DISK_STORAGE,
  60                 .storage_flags = 0,
  61                 .name = "definition"
  62         }
  63 };
  64
  65 /** Define an osl table description for a blob table. */
  66 #define DEFINE_BLOB_TABLE_DESC(table_name) \
  67         struct osl_table_description table_name ## _table_desc = { \
  68                 .name = #table_name, \
  69                 .num_columns = NUM_BLOB_COLUMNS, \
  70                 .flags = OSL_LARGE_TABLE, \
  71                 .column_descriptions = blob_cols \
  72         };
  73
  74 /** Define a pointer to an osl blob table with a canonical name. */
  75 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
  76
  77
  78 /** Define a blob table. */
  79 #define INIT_BLOB_TABLE(table_name) \
  80         DEFINE_BLOB_TABLE_DESC(table_name); \
  81         DEFINE_BLOB_TABLE_PTR(table_name);
  82
  83 /** \cond doxygen isn't smart enough to recognize these */
  84 INIT_BLOB_TABLE(lyrics);
  85 INIT_BLOB_TABLE(images);
  86 INIT_BLOB_TABLE(moods);
  87 INIT_BLOB_TABLE(playlists);
  88 /** \endcond */
  89
  90 /** Flags that may be passed to the \p ls functions of each blob  type. */
  91 enum blob_ls_flags {
  92         /** List both id and name. */
  93         BLOB_LS_FLAG_LONG = 1,
  94         /** Reverse sort order. */
  95         BLOB_LS_FLAG_REVERSE = 2,
  96         /** Sort by id instead of name. */
  97         BLOB_LS_FLAG_SORT_BY_ID = 4,
  98 };
  99
 100 /** Structure passed to the \p print_blob function. */
 101 struct lsblob_action_data {
 102         /** The flags given at the command line. */
 103         uint32_t flags;
 104         /** Message buffer. */
 105         struct para_buffer pb;
 106 };
 107
 108 static int print_blob(struct osl_table *table, struct osl_row *row,
 109                 const char *name, void *data)
 110 {
 111         struct lsblob_action_data *lbad = data;
 112         struct osl_object obj;
 113         uint32_t id;
 114         int ret;
 115
 116         if (!(lbad->flags & BLOB_LS_FLAG_LONG))
 117                 return para_printf(&lbad->pb, "%s\n", name);
 118         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 119         if (ret < 0) {
 120                 para_printf(&lbad->pb, "%s: %s\n", name, para_strerror(-ret));
 121                 return ret;
 122         }
 123         id = *(uint32_t *)obj.data;
 124         return para_printf(&lbad->pb, "%u\t%s\n", id, name);
 125 }
 126
 127 static void com_lsblob_callback(struct osl_table *table,
 128                 int fd, const struct osl_object *query)
 129 {
 130         struct lsblob_action_data lbad = {
 131                 .flags = *(uint32_t *)query->data,
 132                 .pb = {
 133                         .max_size = SHMMAX,
 134                         .private_data = &fd,
 135                         .max_size_handler = pass_buffer_as_shm
 136                 }
 137         };
 138         struct pattern_match_data pmd = {
 139                 .table = table,
 140                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
 141                         .size = query->size - sizeof(uint32_t)},
 142                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 143                 .match_col_num = BLOBCOL_NAME,
 144                 .data = &lbad,
 145                 .action = print_blob,
 146         };
 147         int ret;
 148
 149         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
 150                 pmd.pm_flags |= PM_REVERSE_LOOP;
 151         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 152                 pmd.loop_col_num = BLOBCOL_NAME;
 153         else
 154                 pmd.loop_col_num = BLOBCOL_ID;
 155         ret = for_each_matching_row(&pmd);
 156         if (ret < 0)
 157                 para_printf(&lbad.pb, "%s\n", para_strerror(-ret));
 158         if (lbad.pb.offset)
 159                 pass_buffer_as_shm(lbad.pb.buf, lbad.pb.offset, &fd);
 160         free(lbad.pb.buf);
 161 }
 162
 163 static int com_lsblob(callback_function *f, struct stream_cipher_context *scc, int argc, char * const * const argv)
 164 {
 165         uint32_t flags = 0;
 166         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 167         int i;
 168
 169         for (i = 1; i < argc; i++) {
 170                 const char *arg = argv[i];
 171                 if (arg[0] != '-')
 172                         break;
 173                 if (!strcmp(arg, "--")) {
 174                         i++;
 175                         break;
 176                 }
 177                 if (!strcmp(arg, "-l")) {
 178                         flags |= BLOB_LS_FLAG_LONG;
 179                         continue;
 180                 }
 181                 if (!strcmp(arg, "-i")) {
 182                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 183                         continue;
 184                 }
 185                 if (!strcmp(arg, "-r")) {
 186                         flags |= BLOB_LS_FLAG_REVERSE;
 187                         continue;
 188                 }
 189                 break;
 190         }
 191 //      if (argc > i)
 192 //              return -E_BLOB_SYNTAX;
 193         return send_option_arg_callback_request(&options, argc - i,
 194                 argv + i, f, sc_send_result, scc);
 195 }
 196
 197 static int cat_blob(struct osl_table *table, struct osl_row *row,
 198                 __a_unused const char *name, void *data)
 199 {
 200         int ret = 0, ret2;
 201         struct osl_object obj;
 202
 203         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 204         if (ret < 0)
 205                 return ret;
 206         if (obj.size)
 207                 ret = pass_buffer_as_shm(obj.data, obj.size, data);
 208         ret2 = osl(osl_close_disk_object(&obj));
 209         return (ret < 0)? ret : ret2;
 210 }
 211
 212 static void com_catblob_callback(struct osl_table *table, int fd,
 213                 const struct osl_object *query)
 214 {
 215         struct pattern_match_data pmd = {
 216                 .table = table,
 217                 .patterns = *query,
 218                 .loop_col_num = BLOBCOL_NAME,
 219                 .match_col_num = BLOBCOL_NAME,
 220                 .pm_flags = PM_SKIP_EMPTY_NAME,
 221                 .data = &fd,
 222                 .action = cat_blob
 223         };
 224         for_each_matching_row(&pmd);
 225 }
 226
 227 static int com_catblob(callback_function *f, struct stream_cipher_context *scc, int argc,
 228                 char * const * const argv)
 229 {
 230         if (argc < 2)
 231                 return -E_BLOB_SYNTAX;
 232         return send_standard_callback_request(argc - 1, argv + 1, f,
 233                 sc_send_result, scc);
 234 }
 235
 236 /** Used for removing rows from a blob table. */
 237 struct rmblob_data {
 238         /** Message buffer. */
 239         struct para_buffer pb;
 240         /** Number of removed blobs. */
 241         unsigned num_removed;
 242 };
 243
 244 static int remove_blob(struct osl_table *table, struct osl_row *row,
 245                 const char *name, void *data)
 246 {
 247         struct rmblob_data *rmbd = data;
 248         int ret = osl(osl_del_row(table, row));
 249         if (ret < 0) {
 250                 para_printf(&rmbd->pb, "%s: %s\n", name, para_strerror(-ret));
 251                 return ret;
 252         }
 253         rmbd->num_removed++;
 254         return 1;
 255 }
 256
 257 static void com_rmblob_callback(struct osl_table *table, int fd,
 258                 const struct osl_object *query)
 259 {
 260         int ret, ret2 = 0;
 261         struct rmblob_data rmbd = {
 262                 .num_removed = 0,
 263                 .pb = {
 264                         .max_size = SHMMAX,
 265                         .private_data = &fd,
 266                         .max_size_handler = pass_buffer_as_shm
 267                 }
 268         };
 269         struct pattern_match_data pmd = {
 270                 .table = table,
 271                 .patterns = *query,
 272                 .loop_col_num = BLOBCOL_NAME,
 273                 .match_col_num = BLOBCOL_NAME,
 274                 .pm_flags = PM_SKIP_EMPTY_NAME,
 275                 .data = &rmbd,
 276                 .action = remove_blob
 277         };
 278         ret = for_each_matching_row(&pmd);
 279         if (ret < 0) {
 280                 ret2 = para_printf(&rmbd.pb, "%s\n", para_strerror(-ret));
 281                 if (ret2 < 0)
 282                         goto out;
 283         }
 284         if (!rmbd.num_removed)
 285                 ret2 = para_printf(&rmbd.pb, "no matches, nothing removed\n");
 286         else {
 287                 ret2 = para_printf(&rmbd.pb, "removed %d blobs\n", rmbd.num_removed);
 288                 afs_event(BLOB_RENAME, NULL, table);
 289         }
 290 out:
 291         if (ret2 >= 0 && rmbd.pb.offset)
 292                 pass_buffer_as_shm(rmbd.pb.buf, rmbd.pb.offset, &fd);
 293         free(rmbd.pb.buf);
 294 }
 295
 296 static int com_rmblob(callback_function *f, struct stream_cipher_context *scc, int argc,
 297                 char * const * const argv)
 298 {
 299         if (argc < 2)
 300                 return -E_MOOD_SYNTAX;
 301         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 302                 sc_send_result, scc);
 303 }
 304
 305 static void com_addblob_callback(struct osl_table *table, __a_unused int fd,
 306                 const struct osl_object *query)
 307 {
 308         struct osl_object objs[NUM_BLOB_COLUMNS];
 309         char *name = query->data;
 310         size_t name_len = strlen(name) + 1;
 311         uint32_t id;
 312         unsigned num_rows;
 313         int ret;
 314
 315         ret = osl(osl_get_num_rows(table, &num_rows));
 316         if (ret < 0)
 317                 goto out;
 318         if (!num_rows) { /* this is the first entry ever added */
 319                 /* insert dummy row containing the id */
 320                 id = 2; /* this entry will be entry #1, so 2 is the next */
 321                 objs[BLOBCOL_ID].data = &id;
 322                 objs[BLOBCOL_ID].size = sizeof(id);
 323                 objs[BLOBCOL_NAME].data = "";
 324                 objs[BLOBCOL_NAME].size = 1;
 325                 objs[BLOBCOL_DEF].data = "";
 326                 objs[BLOBCOL_DEF].size = 1;
 327                 ret = osl(osl_add_row(table, objs));
 328                 if (ret < 0)
 329                         goto out;
 330         } else {
 331                 /* check if name already exists */
 332                 struct osl_row *row;
 333                 struct osl_object obj = {.data = name, .size = name_len};
 334                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 335                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 336                         goto out;
 337                 if (ret >= 0) { /* we already have a blob with this name */
 338                         obj.data = name + name_len;
 339                         obj.size = query->size - name_len;
 340                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 341                         goto out;
 342                 }
 343                 /* new blob, get id of the dummy row and increment it */
 344                 obj.data = "";
 345                 obj.size = 1;
 346                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 347                 if (ret < 0)
 348                         goto out;
 349                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 350                 if (ret < 0)
 351                         goto out;
 352                 id = *(uint32_t *)obj.data + 1;
 353                 obj.data = &id;
 354                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 355                 if (ret < 0)
 356                         goto out;
 357         }
 358         id--;
 359         objs[BLOBCOL_ID].data = &id;
 360         objs[BLOBCOL_ID].size = sizeof(id);
 361         objs[BLOBCOL_NAME].data = name;
 362         objs[BLOBCOL_NAME].size = name_len;
 363         objs[BLOBCOL_DEF].data = name + name_len;
 364         objs[BLOBCOL_DEF].size = query->size - name_len;
 365         ret = osl(osl_add_row(table, objs));
 366         if (ret < 0)
 367                 goto out;
 368         afs_event(BLOB_ADD, NULL, table);
 369 out:
 370         if (ret < 0)
 371                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 372 }
 373
 374 /*
 375  * write input from fd to dynamically allocated buffer,
 376  * but maximal max_size byte.
 377  */
 378 static int fd2buf(struct stream_cipher_context *scc, unsigned max_size, struct osl_object *obj)
 379 {
 380         const size_t chunk_size = 1024;
 381         size_t size = 2048, received = 0;
 382         int ret;
 383         char *buf = para_malloc(size);
 384
 385         for (;;) {
 386                 ret = sc_recv_bin_buffer(scc, buf + received, chunk_size);
 387                 if (ret <= 0)
 388                         break;
 389                 received += ret;
 390                 if (received + chunk_size >= size) {
 391                         size *= 2;
 392                         ret = -E_INPUT_TOO_LARGE;
 393                         if (size > max_size)
 394                                 break;
 395                         buf = para_realloc(buf, size);
 396                 }
 397         }
 398         obj->data = buf;
 399         obj->size = received;
 400         if (ret < 0)
 401                 free(buf);
 402         return ret;
 403 }
 404
 405 /*
 406  * Read data from a file descriptor, and send it to the afs process.
 407  *
 408  * \param scc crypt context containing the file descriptor to read data from.
 409  * \param arg_obj Pointer to the arguments to \a f.
 410  * \param f The callback function.
 411  * \param max_len Don't read more than that many bytes from stdin.
 412  * \param result_handler See \ref send_callback_request.
 413  * \param private_result_data See \ref send_callback_request.
 414  *
 415  * This function is used by commands that wish to let para_server store
 416  * arbitrary data specified by the user (for instance the add_blob family of
 417  * commands). First, at most \a max_len bytes are read and decrypted from the
 418  * file descriptor given by \a scc. The result is concatenated with the buffer
 419  * given by \a arg_obj, and the combined buffer is made available to the afs
 420  * process via the callback method. See \ref send_callback_request for details.
 421  *
 422  * \return Negative on errors, the return value of the underlying call to
 423  * send_callback_request() otherwise.
 424  */
 425 static int stdin_command(struct stream_cipher_context *scc, struct osl_object *arg_obj,
 426                 callback_function *f, unsigned max_len,
 427                 callback_result_handler *result_handler,
 428                 void *private_result_data)
 429 {
 430         struct osl_object query, stdin_obj;
 431         int ret;
 432
 433         ret = sc_send_buffer(scc, AWAITING_DATA_MSG);
 434         if (ret < 0)
 435                 return ret;
 436         ret = fd2buf(scc, max_len, &stdin_obj);
 437         if (ret < 0)
 438                 return ret;
 439         query.size = arg_obj->size + stdin_obj.size;
 440         query.data = para_malloc(query.size);
 441         memcpy(query.data, arg_obj->data, arg_obj->size);
 442         memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
 443         free(stdin_obj.data);
 444         ret = send_callback_request(f, &query, result_handler, private_result_data);
 445         free(query.data);
 446         return ret;
 447 }
 448
 449 static int com_addblob(callback_function *f, struct stream_cipher_context *scc, int argc,
 450                 char * const * const argv)
 451 {
 452         struct osl_object arg_obj;
 453
 454         if (argc != 2)
 455                 return -E_BLOB_SYNTAX;
 456         if (!*argv[1]) /* empty name is reserved for the dummy row */
 457                 return -E_BLOB_SYNTAX;
 458         arg_obj.size = strlen(argv[1]) + 1;
 459         arg_obj.data = (char *)argv[1];
 460         return stdin_command(scc, &arg_obj, f, 10 * 1024 * 1024, NULL, NULL);
 461 }
 462
 463 /* FIXME: Print output to client, not to log file */
 464 static void com_mvblob_callback(struct osl_table *table, __a_unused int fd,
 465                 const struct osl_object *query)
 466 {
 467         char *src = (char *) query->data;
 468         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 469         char *dest = src + obj.size;
 470         struct osl_row *row;
 471         int ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 472
 473         if (ret < 0)
 474                 goto out;
 475         obj.data = dest;
 476         obj.size = strlen(dest) + 1;
 477         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 478         if (ret < 0)
 479                 goto out;
 480         afs_event(BLOB_RENAME, NULL, table);
 481 out:
 482         if (ret < 0)
 483                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 484 }
 485
 486 static int com_mvblob(callback_function *f, __a_unused struct stream_cipher_context *scc,
 487                 int argc, char * const * const argv)
 488 {
 489         if (argc != 3)
 490                 return -E_MOOD_SYNTAX;
 491         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 492                 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 stream_cipher_context *scc, int argc, char * const * const argv) \
 501         { \
 502                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, scc, argc, argv); \
 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 /** \cond doxygen isn't smart enough to recognize these */
 666 DEFINE_BLOB_FUNCTIONS(lyrics, lyr);
 667 DEFINE_BLOB_FUNCTIONS(images, img);
 668 DEFINE_BLOB_FUNCTIONS(moods, mood);
 669 DEFINE_BLOB_FUNCTIONS(playlists, pl);
 670 /** \endcond */