Merge branch 'refs/heads/t/lopsub'
[osl.git] / osl.c
1 /*
2 * Copyright (C) 2007-2009 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file osl.c Object storage layer functions. */
8 #include <dirent.h> /* readdir() */
9 #include <assert.h>
10
11 #include "log.h"
12 #include "osl.h"
13 #include "util.h"
14 #include "osl_core.h"
15
16 /*
17 * Taken from Drepper: How to write shared libraries, Appendix B.
18 *
19 * The main reason for this rather fancy implementation of strerror() is to
20 * avoid having an array of pointers. This is desirable because initialized
21 * pointer variables increase the startup time of the library due to the
22 * processing of relocations.
23 */
24 #include <stddef.h>
25 #define MSGSTRFIELD(line) MSGSTRFIELD1(line)
26 #define MSGSTRFIELD1(line) str##line
27 static const union msgstr_t {
28 struct {
29 #define OSL_ERROR(n, s) char MSGSTRFIELD(__LINE__)[sizeof(s)];
30 #include "errtab.h"
31 #undef OSL_ERROR
32 };
33 char str[0];
34 } msgstr = { {
35 #define OSL_ERROR(n, s) s,
36 #include "errtab.h"
37 #undef OSL_ERROR
38 } };
39 static const unsigned int errmsgidx[] = {
40 #define OSL_ERROR(n, s) [n] = offsetof(union msgstr_t, MSGSTRFIELD(__LINE__)),
41 #include "errtab.h"
42 #undef OSL_ERROR
43 };
44
45 __export const char *osl_strerror(int num)
46 {
47 return msgstr.str + errmsgidx[num];
48 }
49
50 int loglevel = 0;
51
52 static void __attribute ((constructor)) init_loglevel(void)
53 {
54 char *p = getenv("OSL_LOGLEVEL");
55
56 /* don't log anything if unset */
57 loglevel = p? atoi(p) : EMERG + 1;
58 }
59
60 /**
61 * The log function.
62 *
63 * \param ll Loglevel.
64 * \param fmt Usual format string.
65 *
66 * All XXX_LOG() macros use this function.
67 */
68 __printf_2_3 void __log(int ll, const char* fmt,...)
69 {
70 va_list argp;
71 struct tm *tm;
72 time_t t1;
73 char str[255] = "";
74
75 if (ll < loglevel)
76 return;
77 time(&t1);
78 tm = localtime(&t1);
79 strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
80 fprintf(stderr, "%s ", str);
81 va_start(argp, fmt);
82 vfprintf(stderr, fmt, argp);
83 va_end(argp);
84 }
85
86 /**
87 * A wrapper for lseek(2).
88 *
89 * \param fd The file descriptor whose offset is to be to repositioned.
90 * \param offset A value-result parameter.
91 * \param whence Usual repositioning directive.
92 *
93 * Reposition the offset of the file descriptor \a fd to the argument \a offset
94 * according to the directive \a whence. Upon successful return, \a offset
95 * contains the resulting offset location as measured in bytes from the
96 * beginning of the file.
97 *
98 * \return Positive on success. Otherwise, the function returns \p -E_OSL_LSEEK.
99 *
100 * \sa lseek(2).
101 */
102 static int __lseek(int fd, off_t *offset, int whence)
103 {
104 *offset = lseek(fd, *offset, whence);
105 int ret = -E_OSL_LSEEK;
106 if (*offset == -1)
107 return ret;
108 return 1;
109 }
110
111 static int append_file(const char *filename, char *data, size_t data_size,
112 uint32_t *new_pos)
113 {
114 int ret, fd;
115
116 // DEBUG_LOG("appending %zu + %zu bytes\n", header_size, data_size);
117 ret = osl_open(filename, O_WRONLY | O_CREAT | O_APPEND, 0644);
118 if (ret < 0)
119 return ret;
120 fd = ret;
121 ret = write_all(fd, data, &data_size);
122 if (ret < 0)
123 goto out;
124 if (new_pos) {
125 off_t offset = 0;
126 ret = __lseek(fd, &offset, SEEK_END);
127 if (ret < 0)
128 goto out;
129 // DEBUG_LOG("new file size: " FMT_OFF_T "\n", offset);
130 *new_pos = offset;
131 }
132 ret = 1;
133 out:
134 close(fd);
135 return ret;
136 }
137
138 static int verify_name(const char *name)
139 {
140 if (!name)
141 return -E_OSL_BAD_NAME;
142 if (!*name)
143 return -E_OSL_BAD_NAME;
144 if (strchr(name, '/'))
145 return -E_OSL_BAD_NAME;
146 if (!strcmp(name, ".."))
147 return -E_OSL_BAD_NAME;
148 if (!strcmp(name, "."))
149 return -E_OSL_BAD_NAME;
150 return 1;
151 }
152
153 static char *disk_storage_dirname(const struct osl_table *t, unsigned col_num,
154 const char *ds_name)
155 {
156 char *dirname, *column_name = column_filename(t, col_num);
157
158 if (!column_name)
159 return NULL;
160 if (!(t->desc->flags & OSL_LARGE_TABLE))
161 return column_name;
162 dirname = make_message("%s/%.2s", column_name, ds_name);
163 free(column_name);
164 return dirname;
165 }
166
167 static char *disk_storage_name_of_object(const struct osl_table *t,
168 const struct osl_object *obj)
169 {
170 HASH_TYPE hash[HASH_SIZE];
171 hash_object(obj, hash);
172 return disk_storage_name_of_hash(t, hash);
173 }
174
175 static int disk_storage_name_of_row(const struct osl_table *t,
176 const struct osl_row *row, char **name)
177 {
178 struct osl_object obj;
179 int ret = osl_get_object(t, row, t->disk_storage_name_column, &obj);
180
181 if (ret < 0)
182 return ret;
183 *name = disk_storage_name_of_object(t, &obj);
184 if (*name)
185 return 1;
186 return -E_OSL_NOMEM;
187 }
188
189 static void column_name_hash(const char *col_name, HASH_TYPE *hash)
190 {
191 hash_function(col_name, strlen(col_name), hash);
192 }
193
194 static int init_column_descriptions(struct osl_table *t)
195 {
196 int i, j, ret;
197 const struct osl_column_description *cd;
198
199 ret = verify_name(t->desc->name);
200 if (ret < 0)
201 goto err;
202 ret = -E_OSL_BAD_DB_DIR;
203 if (!t->desc->dir && (t->num_disk_storage_columns || t->num_mapped_columns))
204 goto err;
205 /* the size of the index header without column descriptions */
206 t->index_header_size = IDX_COLUMN_DESCRIPTIONS;
207 FOR_EACH_COLUMN(i, t->desc, cd) {
208 struct osl_column *col = t->columns + i;
209 if (cd->storage_flags & OSL_RBTREE) {
210 if (!cd->compare_function)
211 return -E_OSL_NO_COMPARE_FUNC;
212 }
213 if (cd->storage_type == OSL_NO_STORAGE)
214 continue;
215 ret = -E_OSL_NO_COLUMN_NAME;
216 if (!cd->name || !cd->name[0])
217 goto err;
218 ret = verify_name(cd->name);
219 if (ret < 0)
220 goto err;
221 t->index_header_size += index_column_description_size(cd->name);
222 column_name_hash(cd->name, col->name_hash);
223 ret = -E_OSL_DUPLICATE_COL_NAME;
224 for (j = i + 1; j < t->desc->num_columns; j++) {
225 const char *name2 = get_column_description(t->desc,
226 j)->name;
227 if (cd->name && name2 && !strcmp(cd->name, name2))
228 goto err;
229 }
230 }
231 return 1;
232 err:
233 return ret;
234 }
235
236 /**
237 * Initialize a struct table from given table description.
238 *
239 * \param desc The description of the osl table.
240 * \param table_ptr Result is returned here.
241 *
242 * This function performs several sanity checks on \p desc and returns if any
243 * of these tests fail. On success, a struct \p osl_table is allocated and
244 * initialized with data derived from \p desc.
245 *
246 * \return Standard.
247 *
248 * \sa struct osl_table.
249 */
250 int init_table_structure(const struct osl_table_description *desc,
251 struct osl_table **table_ptr)
252 {
253 const struct osl_column_description *cd;
254 struct osl_table *t = calloc(1, sizeof(*t));
255 int i, ret = -E_OSL_NOMEM, have_disk_storage_name_column = 0;
256
257 if (!t)
258 return ret;
259 ret = -E_OSL_BAD_TABLE_DESC;
260 if (!desc)
261 goto err;
262 DEBUG_LOG("creating table structure for '%s' from table "
263 "description\n", desc->name);
264 ret = -E_OSL_NO_COLUMN_DESC;
265 if (!desc->column_descriptions)
266 goto err;
267 ret = -E_OSL_NO_COLUMNS;
268 if (!desc->num_columns)
269 goto err;
270 ret = -E_OSL_NOMEM;
271 t->columns = calloc(desc->num_columns, sizeof(struct osl_column));
272 if (!t->columns)
273 goto err;
274 t->desc = desc;
275 FOR_EACH_COLUMN(i, t->desc, cd) {
276 enum osl_storage_type st = cd->storage_type;
277 enum osl_storage_flags sf = cd->storage_flags;
278 struct osl_column *col = &t->columns[i];
279
280 ret = -E_OSL_BAD_STORAGE_TYPE;
281 if (st != OSL_MAPPED_STORAGE && st != OSL_DISK_STORAGE
282 && st != OSL_NO_STORAGE)
283 goto err;
284 ret = -E_OSL_BAD_STORAGE_FLAGS;
285 if (st == OSL_DISK_STORAGE && sf & OSL_RBTREE)
286 goto err;
287 if ((sf & OSL_RBTREE) && !(sf & OSL_UNIQUE))
288 WARNING_LOG("invalid storage flags for column %s: "
289 "OSL_RBTREE && !OSL_UNIQUE\n", cd->name);
290 ret = -E_OSL_BAD_STORAGE_SIZE;
291 if (sf & OSL_FIXED_SIZE && !cd->data_size)
292 goto err;
293 switch (st) {
294 case OSL_DISK_STORAGE:
295 t->num_disk_storage_columns++;
296 break;
297 case OSL_MAPPED_STORAGE:
298 t->num_mapped_columns++;
299 col->index_offset = t->row_index_size;
300 t->row_index_size += 8;
301 break;
302 case OSL_NO_STORAGE:
303 col->volatile_num = t->num_volatile_columns;
304 t->num_volatile_columns++;
305 break;
306 }
307 if (sf & OSL_RBTREE) {
308 col->rbtree_num = t->num_rbtrees;
309 t->num_rbtrees++;
310 if ((sf & OSL_UNIQUE) && (st == OSL_MAPPED_STORAGE)) {
311 if (!have_disk_storage_name_column)
312 t->disk_storage_name_column = i;
313 have_disk_storage_name_column = 1;
314 }
315 }
316 }
317 ret = -E_OSL_NO_UNIQUE_RBTREE_COLUMN;
318 if (t->num_disk_storage_columns && !have_disk_storage_name_column)
319 goto err;
320 ret = -E_OSL_NO_RBTREE_COL;
321 if (!t->num_rbtrees)
322 goto err;
323 /* success */
324 DEBUG_LOG("OK. Index entry size: %u\n", t->row_index_size);
325 ret = init_column_descriptions(t);
326 if (ret < 0)
327 goto err;
328 *table_ptr = t;
329 return 1;
330 err:
331 free(t->columns);
332 free(t);
333 return ret;
334 }
335
336 /**
337 * Read the table description from index header.
338 *
339 * \param map The memory mapping of the index file.
340 * \param desc The values found in the index header are returned here.
341 *
342 * Read the index header, check for the osl magic string and the table version
343 * number. Read all information stored in the index header into \a desc.
344 *
345 * \return Standard.
346 *
347 * \sa struct osl_table_description, osl_create_table.
348 */
349 int read_table_desc(struct osl_object *map, struct osl_table_description *desc)
350 {
351 char *buf = map->data;
352 uint8_t version, compat_version, create_version;
353 uint16_t header_size;
354 int ret, i;
355 unsigned offset;
356 struct osl_column_description *cd;
357
358 if (map->size < MIN_INDEX_HEADER_SIZE(1))
359 return -E_OSL_SHORT_TABLE;
360 if (strncmp(buf + IDX_OSL_MAGIC, OSL_MAGIC, strlen(OSL_MAGIC)))
361 return -E_OSL_NO_MAGIC;
362 version = read_u8(buf + IDX_VERSION);
363 /*
364 * The on-disk version consists of two version numbers: the
365 * create_version (low 4 bits) is the CURRENT_TABLE_VERSION version
366 * number of the library that created the table, and compat_version
367 * (high 4 bits) tells us the lowest version of the library that can
368 * still read this table.
369 */
370 create_version = version & 0xf;
371 compat_version = version >> 4;
372 INFO_LOG("create_version: %u, compat_version: %u\n", create_version,
373 compat_version);
374 if (create_version < MIN_TABLE_VERSION /* table too old */
375 || compat_version > CURRENT_TABLE_VERSION) /* libosl too old */
376 return -E_OSL_VERSION_MISMATCH;
377 desc->flags = read_u8(buf + IDX_TABLE_FLAGS);
378 desc->num_columns = read_u16(buf + IDX_NUM_COLUMNS);
379 INFO_LOG("%u columns\n", desc->num_columns);
380 if (!desc->num_columns)
381 return -E_OSL_NO_COLUMNS;
382 header_size = read_u16(buf + IDX_HEADER_SIZE);
383 if (map->size < header_size)
384 return -E_OSL_BAD_SIZE;
385 desc->column_descriptions = calloc(desc->num_columns,
386 sizeof(struct osl_column_description));
387 if (!desc->column_descriptions)
388 return -E_OSL_NOMEM;
389 offset = IDX_COLUMN_DESCRIPTIONS;
390 FOR_EACH_COLUMN(i, desc, cd) {
391 char *null_byte;
392
393 ret = -E_OSL_SHORT_TABLE;
394 if (map->size < offset + MIN_IDX_COLUMN_DESCRIPTION_SIZE) {
395 ERROR_LOG("map size = %zu < %u = offset + min desc size\n",
396 map->size, offset + MIN_IDX_COLUMN_DESCRIPTION_SIZE);
397 goto err;
398 }
399 cd->storage_type = read_u16(buf + offset + IDX_CD_STORAGE_TYPE);
400 cd->storage_flags = read_u16(buf + offset +
401 IDX_CD_STORAGE_FLAGS);
402 cd->data_size = read_u32(buf + offset + IDX_CD_DATA_SIZE);
403 null_byte = memchr(buf + offset + IDX_CD_NAME, '\0',
404 map->size - offset - IDX_CD_NAME);
405 ret = -E_OSL_INDEX_CORRUPTION;
406 if (!null_byte)
407 goto err;
408 ret = -E_OSL_NOMEM;
409 cd->name = strdup(buf + offset + IDX_CD_NAME);
410 if (!cd->name)
411 goto err;
412 offset += index_column_description_size(cd->name);
413 }
414 if (offset != header_size) {
415 ret = -E_OSL_INDEX_CORRUPTION;
416 ERROR_LOG("real header size = %u != %u = stored header size\n",
417 offset, header_size);
418 goto err;
419 }
420 return 1;
421 err:
422 FOR_EACH_COLUMN(i, desc, cd)
423 free(cd->name);
424 return ret;
425 }
426
427 /*
428 * check whether the table description given by \p t->desc matches the on-disk
429 * table structure stored in the index of \a t.
430 */
431 static int compare_table_descriptions(struct osl_table *t)
432 {
433 int i, ret;
434 struct osl_table_description desc;
435 const struct osl_column_description *cd1, *cd2;
436
437 /* read the on-disk structure into desc */
438 ret = read_table_desc(&t->index_map, &desc);
439 if (ret < 0)
440 return ret;
441 ret = -E_OSL_BAD_TABLE_FLAGS;
442 if (desc.flags != t->desc->flags)
443 goto out;
444 ret = -E_OSL_BAD_COLUMN_NUM;
445 if (desc.num_columns > t->desc->num_columns)
446 goto out;
447 if (desc.num_columns < t->desc->num_columns) {
448 struct osl_column_description *cd;
449 unsigned diff = t->desc->num_columns - desc.num_columns;
450 INFO_LOG("extending table by %u volatile columns\n", diff);
451 ret = -E_OSL_NOMEM;
452 desc.column_descriptions = realloc(desc.column_descriptions,
453 t->desc->num_columns * sizeof(struct osl_column_description));
454 if (!desc.column_descriptions)
455 goto out;
456 for (i = desc.num_columns; i < t->desc->num_columns; i++) {
457 cd = get_column_description(&desc, i);
458 cd->storage_type = OSL_NO_STORAGE;
459 cd->name = NULL;
460 }
461 desc.num_columns += diff;
462 }
463 FOR_EACH_COLUMN(i, t->desc, cd1) {
464 cd2 = get_column_description(&desc, i);
465 ret = -E_OSL_BAD_STORAGE_TYPE;
466 if (cd1->storage_type != cd2->storage_type)
467 goto out;
468 if (cd1->storage_type == OSL_NO_STORAGE)
469 continue;
470 ret = -E_OSL_BAD_STORAGE_FLAGS;
471 if (cd1->storage_flags != cd2->storage_flags) {
472 ERROR_LOG("sf1 = %u != %u = sf2\n",
473 cd1->storage_flags, cd2->storage_flags);
474 goto out;
475 }
476 ret = -E_OSL_BAD_DATA_SIZE;
477 if (cd1->storage_flags & OSL_FIXED_SIZE)
478 if (cd1->data_size != cd2->data_size)
479 goto out;
480 ret = -E_OSL_BAD_COLUMN_NAME;
481 if (strcmp(cd1->name, cd2->name))
482 goto out;
483 }
484 INFO_LOG("table description of '%s' matches on-disk data, good\n",
485 t->desc->name);
486 ret = 1;
487 out:
488 FOR_EACH_COLUMN(i, &desc, cd1)
489 free(cd1->name);
490 free(desc.column_descriptions);
491 return ret;
492 }
493
494 static int create_table_index(struct osl_table *t)
495 {
496 char *buf, *filename;
497 int i, ret;
498 size_t size = t->index_header_size;
499 const struct osl_column_description *cd;
500 unsigned offset;
501
502 INFO_LOG("creating %zu byte index for table %s\n", size,
503 t->desc->name);
504 buf = calloc(1, size);
505 if (!buf)
506 return -E_OSL_NOMEM;
507 sprintf(buf + IDX_OSL_MAGIC, "%s", OSL_MAGIC);
508 write_u8(buf + IDX_TABLE_FLAGS, t->desc->flags);
509 write_u8(buf + IDX_DIRTY_FLAG, 0);
510 write_u8(buf + IDX_VERSION, CURRENT_TABLE_VERSION
511 + (COMPAT_TABLE_VERSION << 4));
512 write_u16(buf + IDX_NUM_COLUMNS, t->num_mapped_columns + t->num_disk_storage_columns);
513 write_u16(buf + IDX_HEADER_SIZE, t->index_header_size);
514 offset = IDX_COLUMN_DESCRIPTIONS;
515 FOR_EACH_COLUMN(i, t->desc, cd) {
516 /* no need to store info about volatile storage */
517 if (cd->storage_type == OSL_NO_STORAGE)
518 continue;
519 write_u16(buf + offset + IDX_CD_STORAGE_TYPE,
520 cd->storage_type);
521 write_u16(buf + offset + IDX_CD_STORAGE_FLAGS,
522 cd->storage_flags);
523 if (cd->storage_flags & OSL_FIXED_SIZE)
524 write_u32(buf + offset + IDX_CD_DATA_SIZE,
525 cd->data_size);
526 strcpy(buf + offset + IDX_CD_NAME, cd->name);
527 offset += index_column_description_size(cd->name);
528 }
529 assert(offset == size);
530 filename = index_filename(t->desc);
531 if (filename)
532 ret = write_file(filename, buf, size);
533 else
534 ret = -E_OSL_NOMEM;
535 free(buf);
536 free(filename);
537 return ret;
538 }
539
540 __export int osl_create_table(const struct osl_table_description *desc)
541 {
542 const struct osl_column_description *cd;
543 char *table_dir = NULL, *filename;
544 struct osl_table *t;
545 int i, ret = init_table_structure(desc, &t);
546
547 if (ret < 0)
548 return ret;
549 INFO_LOG("creating %s\n", desc->name);
550 FOR_EACH_COLUMN(i, t->desc, cd) {
551 if (cd->storage_type == OSL_NO_STORAGE)
552 continue;
553 if (!table_dir) {
554 ret = osl_mkdir(desc->dir, 0777);
555 if (ret < 0 && ret != -E_OSL_DIR_EXISTS)
556 goto out;
557 table_dir = make_message("%s/%s", desc->dir,
558 desc->name);
559 ret = -E_OSL_NOMEM;
560 if (!table_dir)
561 goto out;
562 ret = osl_mkdir(table_dir, 0777);
563 if (ret < 0)
564 goto out;
565 }
566 ret = -E_OSL_NOMEM;
567 filename = column_filename(t, i);
568 if (!filename)
569 goto out;
570 INFO_LOG("filename: %s\n", filename);
571 if (cd->storage_type == OSL_MAPPED_STORAGE) {
572 ret = osl_open(filename, O_RDWR | O_CREAT | O_EXCL,
573 0644);
574 free(filename);
575 if (ret < 0)
576 goto out;
577 close(ret);
578 continue;
579 }
580 /* DISK STORAGE */
581 ret = osl_mkdir(filename, 0777);
582 free(filename);
583 if (ret < 0)
584 goto out;
585 }
586 if (t->num_mapped_columns) {
587 ret = create_table_index(t);
588 if (ret < 0)
589 goto out;
590 }
591 ret = 1;
592 out:
593 free(table_dir);
594 free(t->columns);
595 free(t);
596 return ret;
597 }
598
599 static int table_is_dirty(struct osl_table *t)
600 {
601 char *buf = (char *)t->index_map.data + IDX_DIRTY_FLAG;
602 uint8_t dirty = read_u8(buf) & 0x1;
603 return !!dirty;
604 }
605
606 static void mark_table_dirty(struct osl_table *t)
607 {
608 char *buf = (char *)t->index_map.data + IDX_DIRTY_FLAG;
609 write_u8(buf, read_u8(buf) | 1);
610 }
611
612 static void mark_table_clean(struct osl_table *t)
613 {
614 char *buf = (char *)t->index_map.data + IDX_DIRTY_FLAG;
615 write_u8(buf, read_u8(buf) & 0xfe);
616 }
617
618 static void unmap_column(struct osl_table *t, unsigned col_num)
619 {
620 struct osl_object map = t->columns[col_num].data_map;
621 int ret;
622 if (!map.data)
623 return;
624 ret = osl_munmap(map.data, map.size);
625 assert(ret > 0);
626 map.data = NULL;
627 }
628
629 /**
630 * Unmap all mapped files of an osl table.
631 *
632 * \param t Pointer to a mapped table.
633 * \param flags Options for unmapping.
634 *
635 * \return Positive on success, negative on errors.
636 *
637 * \sa map_table(), enum osl_close_flags, osl_munmap().
638 */
639 int unmap_table(struct osl_table *t, enum osl_close_flags flags)
640 {
641 unsigned i;
642 const struct osl_column_description *cd;
643 int ret;
644
645 if (!t->num_mapped_columns) /* can this ever happen? */
646 return 1;
647 INFO_LOG("unmapping table '%s'\n", t->desc->name);
648 if (!t->index_map.data)
649 return -E_OSL_NOT_MAPPED;
650 if (flags & OSL_MARK_CLEAN)
651 mark_table_clean(t);
652 ret = osl_munmap(t->index_map.data, t->index_map.size);
653 if (ret < 0)
654 return ret;
655 t->index_map.data = NULL;
656 if (!t->num_rows)
657 return 1;
658 FOR_EACH_MAPPED_COLUMN(i, t, cd)
659 unmap_column(t, i);
660 return 1;
661 }
662
663 static int map_column(struct osl_table *t, unsigned col_num)
664 {
665 struct stat statbuf;
666 char *filename = column_filename(t, col_num);
667 int ret;
668
669 if (!filename)
670 return -E_OSL_NOMEM;
671 ret = osl_stat(filename, &statbuf);
672 if (ret < 0) {
673 free(filename);
674 return ret;
675 }
676 if (!(S_IFREG & statbuf.st_mode)) {
677 free(filename);
678 return ret;
679 }
680 ret = mmap_full_file(filename, O_RDWR,
681 &t->columns[col_num].data_map.data,
682 &t->columns[col_num].data_map.size,
683 NULL);
684 free(filename);
685 return ret;
686 }
687
688 /**
689 * Map the index file and all columns of type \p OSL_MAPPED_STORAGE into memory.
690 *
691 * \param t Pointer to an initialized table structure.
692 * \param flags Mapping options.
693 *
694 * \return Negative return value on errors; on success the number of rows
695 * (including invalid rows) is returned.
696 *
697 * \sa unmap_table(), enum map_table_flags, osl_open_table(), mmap(2).
698 */
699 int map_table(struct osl_table *t, enum map_table_flags flags)
700 {
701 char *filename;
702 const struct osl_column_description *cd;
703 int i = 0, ret, num_rows = 0;
704
705 if (!t->num_mapped_columns)
706 return 0;
707 if (t->index_map.data)
708 return -E_OSL_ALREADY_MAPPED;
709 filename = index_filename(t->desc);
710 if (!filename)
711 return -E_OSL_NOMEM;
712 INFO_LOG("mapping table '%s' (index: %s)\n", t->desc->name, filename);
713 ret = mmap_full_file(filename, flags & MAP_TBL_FL_MAP_RDONLY?
714 O_RDONLY : O_RDWR, &t->index_map.data, &t->index_map.size, NULL);
715 free(filename);
716 if (ret < 0)
717 return ret;
718 if (flags & MAP_TBL_FL_VERIFY_INDEX) {
719 ret = compare_table_descriptions(t);
720 if (ret < 0)
721 goto err;
722 }
723 ret = -E_OSL_BUSY;
724 if (!(flags & MAP_TBL_FL_IGNORE_DIRTY)) {
725 if (table_is_dirty(t)) {
726 ERROR_LOG("%s is dirty\n", t->desc->name);
727 goto err;
728 }
729 }
730 mark_table_dirty(t);
731 num_rows = table_num_rows(t);
732 if (!num_rows)
733 return num_rows;
734 /* map data files */
735 FOR_EACH_MAPPED_COLUMN(i, t, cd) {
736 ret = map_column(t, i);
737 if (ret < 0)
738 goto err;
739 }
740 return num_rows;
741 err: /* unmap what is already mapped */
742 for (i--; i >= 0; i--) {
743 struct osl_object map = t->columns[i].data_map;
744 osl_munmap(map.data, map.size);
745 map.data = NULL;
746 }
747 osl_munmap(t->index_map.data, t->index_map.size);
748 t->index_map.data = NULL;
749 return ret;
750 }
751
752 /**
753 * Retrieve a mapped object by row and column number.
754 *
755 * \param t Pointer to an open osl table.
756 * \param col_num Number of the mapped column containing the object to retrieve.
757 * \param row_num Number of the row containing the object to retrieve.
758 * \param obj The result is returned here.
759 *
760 * It is considered an error if \a col_num does not refer to a column
761 * of storage type \p OSL_MAPPED_STORAGE.
762 *
763 * \return Standard.
764 *
765 * \sa osl_storage_type.
766 */
767 int get_mapped_object(const struct osl_table *t, unsigned col_num,
768 uint32_t row_num, struct osl_object *obj)
769 {
770 struct osl_column *col = &t->columns[col_num];
771 uint32_t offset;
772 char *cell_index;
773 int ret;
774
775 if (t->num_rows <= row_num)
776 return -E_OSL_BAD_ROW_NUM;
777 ret = get_cell_index(t, row_num, col_num, &cell_index);
778 if (ret < 0)
779 return ret;
780 offset = read_u32(cell_index);
781 obj->size = read_u32(cell_index + 4);
782 obj->data = col->data_map.data + offset;
783 return 1;
784 }
785
786 /*
787 * It's OK to call this with result = rb_node = NULL. If result is not NULL,
788 * and rb key was not found, result points to the parent node.
789 */
790 static int search_rbtree(const struct osl_object *obj,
791 const struct osl_table *t, unsigned col_num,
792 struct rb_node **result, struct rb_node ***rb_link)
793 {
794 struct osl_column *col = &t->columns[col_num];
795 struct rb_node **new = &col->rbtree.rb_node, *parent = NULL;
796 const struct osl_column_description *cd =
797 get_column_description(t->desc, col_num);
798 enum osl_storage_type st = cd->storage_type;
799 while (*new) {
800 struct osl_row *this_row = get_row_pointer(*new,
801 col->rbtree_num);
802 int ret;
803 struct osl_object this_obj;
804 parent = *new;
805 if (st == OSL_MAPPED_STORAGE) {
806 ret = get_mapped_object(t, col_num, this_row->num,
807 &this_obj);
808 if (ret < 0)
809 return ret;
810 } else
811 this_obj = this_row->volatile_objects[col->volatile_num];
812 ret = cd->compare_function(obj, &this_obj);
813 if (!ret) {
814 if (result)
815 *result = get_rb_node_pointer(this_row,
816 col->rbtree_num);
817 return 1;
818 }
819 if (ret < 0)
820 new = &((*new)->rb_left);
821 else
822 new = &((*new)->rb_right);
823 }
824 if (result)
825 *result = parent;
826 if (rb_link)
827 *rb_link = new;
828 return -E_OSL_RB_KEY_NOT_FOUND;
829 }
830
831 static int insert_rbtree(struct osl_table *t, unsigned col_num,
832 const struct osl_row *row, const struct osl_object *obj)
833 {
834 struct rb_node *parent, **rb_link;
835 unsigned rbtree_num;
836 struct rb_node *n;
837 int ret = search_rbtree(obj, t, col_num, &parent, &rb_link);
838
839 if (ret > 0)
840 return -E_OSL_RB_KEY_EXISTS;
841 rbtree_num = t->columns[col_num].rbtree_num;
842 n = get_rb_node_pointer(row, rbtree_num);
843 rb_link_node(n, parent, rb_link);
844 rb_insert_color(n, &t->columns[col_num].rbtree);
845 return 1;
846 }
847
848 static void remove_rb_node(struct osl_table *t, unsigned col_num,
849 const struct osl_row *row)
850 {
851 struct osl_column *col = &t->columns[col_num];
852 const struct osl_column_description *cd =
853 get_column_description(t->desc, col_num);
854 enum osl_storage_flags sf = cd->storage_flags;
855 struct rb_node *victim, *splice_out_node, *tmp;
856 if (!(sf & OSL_RBTREE))
857 return;
858 /*
859 * Which node is removed/spliced out actually depends on how many
860 * children the victim node has: If it has no children, it gets
861 * deleted. If it has one child, it gets spliced out. If it has two
862 * children, its successor (which has at most a right child) gets
863 * spliced out.
864 */
865 victim = get_rb_node_pointer(row, col->rbtree_num);
866 if (victim->rb_left && victim->rb_right)
867 splice_out_node = rb_next(victim);
868 else
869 splice_out_node = victim;
870 /* Go up to the root and decrement the size of each node in the path. */
871 for (tmp = splice_out_node; tmp; tmp = rb_parent(tmp))
872 tmp->size--;
873 rb_erase(victim, &col->rbtree);
874 }
875
876 static int add_row_to_rbtrees(struct osl_table *t, uint32_t row_num,
877 struct osl_object *volatile_objs, struct osl_row **row_ptr)
878 {
879 unsigned i;
880 int ret;
881 struct osl_row *row = allocate_row(t->num_rbtrees);
882 const struct osl_column_description *cd;
883
884 if (!row)
885 return -E_OSL_NOMEM;
886 row->num = row_num;
887 row->volatile_objects = volatile_objs;
888 FOR_EACH_RBTREE_COLUMN(i, t, cd) {
889 if (cd->storage_type == OSL_MAPPED_STORAGE) {
890 struct osl_object obj;
891 ret = get_mapped_object(t, i, row_num, &obj);
892 if (ret < 0)
893 goto err;
894 ret = insert_rbtree(t, i, row, &obj);
895 } else { /* volatile */
896 const struct osl_object *obj
897 = volatile_objs + t->columns[i].volatile_num;
898 ret = insert_rbtree(t, i, row, obj);
899 }
900 if (ret < 0)
901 goto err;
902 }
903 if (row_ptr)
904 *row_ptr = row;
905 return 1;
906 err: /* rollback changes, i.e. remove added entries from rbtrees */
907 while (i)
908 remove_rb_node(t, i--, row);
909 free(row);
910 return ret;
911 }
912
913 static void free_volatile_objects(const struct osl_table *t,
914 enum osl_close_flags flags)
915 {
916 int i, j;
917 struct rb_node *n;
918 struct osl_column *rb_col;
919 const struct osl_column_description *cd;
920
921 if (!t->num_volatile_columns)
922 return;
923 /* find the first rbtree column (any will do) */
924 FOR_EACH_RBTREE_COLUMN(i, t, cd)
925 break;
926 rb_col = t->columns + i;
927 /* walk that rbtree and free all volatile objects */
928 for (n = rb_first(&rb_col->rbtree); n; n = rb_next(n)) {
929 struct osl_row *r = get_row_pointer(n, rb_col->rbtree_num);
930 if (flags & OSL_FREE_VOLATILE)
931 FOR_EACH_VOLATILE_COLUMN(j, t, cd) {
932 if (cd->storage_flags & OSL_DONT_FREE)
933 continue;
934 free(r->volatile_objects[
935 t->columns[j].volatile_num].data);
936 }
937 // for (j = 0; j < t->num_volatile_columns; j++)
938 // free(r->volatile_objects[j].data);
939 free(r->volatile_objects);
940 }
941 }
942
943 /**
944 * Erase all rbtree nodes and free resources.
945 *
946 * \param t Pointer to an open osl table.
947 *
948 * This function is called by osl_close_table().
949 */
950 void clear_rbtrees(struct osl_table *t)
951 {
952 const struct osl_column_description *cd;
953 unsigned i, rbtrees_cleared = 0;
954
955 FOR_EACH_RBTREE_COLUMN(i, t, cd) {
956 struct osl_column *col = &t->columns[i];
957 struct rb_node *n;
958 rbtrees_cleared++;
959 for (n = rb_first(&col->rbtree); n;) {
960 struct osl_row *r;
961 rb_erase(n, &col->rbtree);
962 if (rbtrees_cleared == t->num_rbtrees) {
963 r = get_row_pointer(n, col->rbtree_num);
964 n = rb_next(n);
965 free(r);
966 } else
967 n = rb_next(n);
968 }
969 }
970
971 }
972
973 __export int osl_close_table(struct osl_table *t, enum osl_close_flags flags)
974 {
975 int ret;
976
977 if (!t)
978 return -E_OSL_BAD_TABLE;
979 NOTICE_LOG("closing table %s\n", t->desc->name);
980 free_volatile_objects(t, flags);
981 clear_rbtrees(t);
982 ret = unmap_table(t, flags);
983 if (ret < 0)
984 ERROR_LOG("unmap_table failed: %d\n", ret);
985 free(t->columns);
986 free(t);
987 return ret;
988 }
989
990 /**
991 * Find out whether the given row number corresponds to an invalid row.
992 *
993 * \param t Pointer to the osl table.
994 * \param row_num The number of the row in question.
995 *
996 * By definition, a row is considered invalid if all its index entries
997 * are invalid.
998 *
999 * \return Positive if \a row_num corresponds to an invalid row,
1000 * zero if it corresponds to a valid row, negative on errors.
1001 */
1002 int row_is_invalid(struct osl_table *t, uint32_t row_num)
1003 {
1004 char *row_index;
1005 int i, ret = get_row_index(t, row_num, &row_index);
1006
1007 if (ret < 0)
1008 return ret;
1009 for (i = 0; i < t->row_index_size; i++) {
1010 if ((unsigned char)row_index[i] != 0xff)
1011 return 0;
1012 }
1013 INFO_LOG("row %d is invalid\n", row_num);
1014 return 1;
1015 }
1016
1017 /**
1018 * Invalidate a row of an osl table.
1019 *
1020 * \param t Pointer to an open osl table.
1021 * \param row_num Number of the row to mark as invalid.
1022 *
1023 * This function marks each mapped object in the index entry of \a row as
1024 * invalid.
1025 *
1026 * \return Standard.
1027 */
1028 int mark_row_invalid(struct osl_table *t, uint32_t row_num)
1029 {
1030 char *row_index;
1031 int ret = get_row_index(t, row_num, &row_index);
1032
1033 if (ret < 0)
1034 return ret;
1035 INFO_LOG("marking row %d as invalid\n", row_num);
1036 memset(row_index, 0xff, t->row_index_size);
1037 return 1;
1038 }
1039
1040 /**
1041 * Initialize all rbtrees and compute number of invalid rows.
1042 *
1043 * \param t The table containing the rbtrees to be initialized.
1044 *
1045 * \return Standard.
1046 */
1047 int init_rbtrees(struct osl_table *t)
1048 {
1049 int i, ret;
1050 const struct osl_column_description *cd;
1051
1052 /* create rbtrees */
1053 FOR_EACH_RBTREE_COLUMN(i, t, cd)
1054 t->columns[i].rbtree = RB_ROOT;
1055 /* add valid rows to rbtrees */
1056 t->num_invalid_rows = 0;
1057 for (i = 0; i < t->num_rows; i++) {
1058 struct osl_object *volatile_objs;
1059 ret = row_is_invalid(t, i);
1060 if (ret < 0)
1061 return ret;
1062 if (ret) {
1063 t->num_invalid_rows++;
1064 continue;
1065 }
1066 if (t->num_volatile_columns > 0) {
1067 volatile_objs = calloc(t->num_volatile_columns,
1068 sizeof(struct osl_object));
1069 if (!volatile_objs)
1070 return -E_OSL_NOMEM;
1071 } else
1072 volatile_objs = NULL;
1073 ret = add_row_to_rbtrees(t, i, volatile_objs, NULL);
1074 if (ret < 0)
1075 return ret;
1076 }
1077 return 1;
1078 }
1079
1080 __export int osl_open_table(const struct osl_table_description *table_desc,
1081 struct osl_table **result)
1082 {
1083 int i, ret;
1084 struct osl_table *t;
1085 const struct osl_column_description *cd;
1086
1087 NOTICE_LOG("opening table %s\n", table_desc->name);
1088 ret = init_table_structure(table_desc, &t);
1089 if (ret < 0)
1090 return ret;
1091 FOR_EACH_DISK_STORAGE_COLUMN(i, t, cd) {
1092 struct stat statbuf;
1093 char *dirname = column_filename(t, i);
1094
1095 ret = -E_OSL_NOMEM;
1096 if (!dirname)
1097 goto err;
1098 /* check if directory exists */
1099 ret = osl_stat(dirname, &statbuf);
1100 free(dirname);
1101 if (ret < 0)
1102 goto err;
1103 ret = -E_OSL_NOTDIR;
1104 if (!S_ISDIR(statbuf.st_mode))
1105 goto err;
1106 }
1107 ret = map_table(t, MAP_TBL_FL_VERIFY_INDEX);
1108 if (ret < 0)
1109 goto err;
1110 t->num_rows = ret;
1111 DEBUG_LOG("num rows: %d\n", t->num_rows);
1112 ret = init_rbtrees(t);
1113 if (ret < 0) {
1114 osl_close_table(t, OSL_MARK_CLEAN); /* ignore further errors */
1115 return ret;
1116 }
1117 *result = t;
1118 return 1;
1119 err:
1120 free(t->columns);
1121 free(t);
1122 return ret;
1123 }
1124
1125 static int create_disk_storage_object_dir(const struct osl_table *t,
1126 unsigned col_num, const char *ds_name)
1127 {
1128 char *dirname;
1129 int ret;
1130
1131 if (!(t->desc->flags & OSL_LARGE_TABLE))
1132 return 1;
1133 dirname = disk_storage_dirname(t, col_num, ds_name);
1134 if (!dirname)
1135 return -E_OSL_NOMEM;
1136 ret = osl_mkdir(dirname, 0777);
1137 free(dirname);
1138 if (ret < 0 && ret != -E_OSL_DIR_EXISTS)
1139 return ret;
1140 return 1;
1141 }
1142
1143 static int write_disk_storage_file(const struct osl_table *t, unsigned col_num,
1144 const struct osl_object *obj, const char *ds_name)
1145 {
1146 int ret;
1147 char *filename;
1148
1149 ret = create_disk_storage_object_dir(t, col_num, ds_name);
1150 if (ret < 0)
1151 return ret;
1152 filename = disk_storage_path(t, col_num, ds_name);
1153 if (!filename)
1154 return -E_OSL_NOMEM;
1155 ret = write_file(filename, obj->data, obj->size);
1156 free(filename);
1157 return ret;
1158 }
1159
1160 static int append_map_file(const struct osl_table *t, unsigned col_num,
1161 const struct osl_object *obj, uint32_t *new_size)
1162 {
1163 char *filename = column_filename(t, col_num);
1164 int ret;
1165
1166 if (!filename)
1167 return -E_OSL_NOMEM;
1168 ret = append_file(filename, obj->data, obj->size, new_size);
1169 free(filename);
1170 return ret;
1171 }
1172
1173 static int append_row_index(const struct osl_table *t, char *row_index)
1174 {
1175 char *filename;
1176 int ret;
1177
1178 if (!t->num_mapped_columns)
1179 return 1;
1180 filename = index_filename(t->desc);
1181 if (!filename)
1182 return -E_OSL_NOMEM;
1183 ret = append_file(filename, row_index, t->row_index_size, NULL);
1184 free(filename);
1185 return ret;
1186 }
1187
1188 static int truncate_mapped_file(const struct osl_table *t, unsigned col_num,
1189 off_t size)
1190 {
1191 int ret;
1192 char *filename = column_filename(t, col_num);
1193
1194 if (!filename)
1195 return -E_OSL_NOMEM;
1196 ret = truncate_file(filename, size);
1197 free(filename);
1198 return ret;
1199 }
1200
1201 static int delete_disk_storage_file(const struct osl_table *t, unsigned col_num,
1202 const char *ds_name)
1203 {
1204 char *dirname, *filename = disk_storage_path(t, col_num, ds_name);
1205 int ret = 1;
1206
1207 if (!filename)
1208 return -E_OSL_NOMEM;
1209 if (unlink(filename) < 0)
1210 ret = errno == ENOENT? -E_OSL_NOENT : -E_OSL_UNLINK;
1211 free(filename);
1212 if (ret < 0)
1213 return ret;
1214 if (!(t->desc->flags & OSL_LARGE_TABLE))
1215 return 1;
1216 dirname = disk_storage_dirname(t, col_num, ds_name);
1217 if (!dirname)
1218 return -E_OSL_NOMEM;
1219 rmdir(dirname);
1220 free(dirname);
1221 return 1;
1222 }
1223
1224 __export int osl_add_and_get_row(struct osl_table *t, struct osl_object *objects,
1225 struct osl_row **row)
1226 {
1227 int i, ret;
1228 char *ds_name = NULL;
1229 struct rb_node **rb_parents = NULL, ***rb_links = NULL;
1230 char *new_row_index = NULL;
1231 struct osl_object *volatile_objs = NULL;
1232 const struct osl_column_description *cd;
1233
1234 if (!t)
1235 return -E_OSL_BAD_TABLE;
1236 rb_parents = malloc(t->num_rbtrees * sizeof(struct rn_node*));
1237 if (!rb_parents)
1238 return -E_OSL_NOMEM;
1239 rb_links = malloc(t->num_rbtrees * sizeof(struct rn_node**));
1240 if (!rb_links) {
1241 free(rb_parents);
1242 return -E_OSL_NOMEM;
1243 }
1244 if (t->num_mapped_columns) {
1245 new_row_index = malloc(t->row_index_size);
1246 if (!new_row_index) {
1247 free(rb_links);
1248 free(rb_parents);
1249 return -E_OSL_NOMEM;
1250 }
1251 }
1252 /* pass 1: sanity checks */
1253 // DEBUG_LOG("sanity tests: %p:%p\n", objects[0].data,
1254 // objects[1].data);
1255 FOR_EACH_COLUMN(i, t->desc, cd) {
1256 enum osl_storage_type st = cd->storage_type;
1257 enum osl_storage_flags sf = cd->storage_flags;
1258
1259 // ret = -E_OSL_NULL_OBJECT;
1260 // if (!objects[i])
1261 // goto out;
1262 if (st == OSL_DISK_STORAGE)
1263 continue;
1264 if (sf & OSL_RBTREE) {
1265 unsigned rbtree_num = t->columns[i].rbtree_num;
1266 ret = -E_OSL_RB_KEY_EXISTS;
1267 // DEBUG_LOG("checking whether %p exists\n",
1268 // objects[i].data);
1269 if (search_rbtree(objects + i, t, i,
1270 &rb_parents[rbtree_num],
1271 &rb_links[rbtree_num]) > 0)
1272 goto out;
1273 }
1274 if (sf & OSL_FIXED_SIZE) {
1275 // DEBUG_LOG("fixed size. need: %zu, have: %d\n",
1276 // objects[i].size, cd->data_size);
1277 ret = -E_OSL_BAD_DATA_SIZE;
1278 if (objects[i].size != cd->data_size)
1279 goto out;
1280 }
1281 }
1282 if (t->num_disk_storage_columns) {
1283 ds_name = disk_storage_name_of_object(t,
1284 &objects[t->disk_storage_name_column]);
1285 ret = -E_OSL_NOMEM;
1286 if (!ds_name)
1287 goto out;
1288 }
1289 ret = unmap_table(t, OSL_MARK_CLEAN);
1290 if (ret < 0)
1291 goto out;
1292 // DEBUG_LOG("sanity tests passed%s\n", "");
1293 /* pass 2: create data files, append map data */
1294 FOR_EACH_COLUMN(i, t->desc, cd) {
1295 enum osl_storage_type st = cd->storage_type;
1296 if (st == OSL_NO_STORAGE)
1297 continue;
1298 if (st == OSL_MAPPED_STORAGE) {
1299 uint32_t new_size;
1300 struct osl_column *col = &t->columns[i];
1301 // DEBUG_LOG("appending object of size %zu\n",
1302 // objects[i].size);
1303 ret = append_map_file(t, i, objects + i, &new_size);
1304 if (ret < 0)
1305 goto rollback;
1306 update_cell_index(new_row_index, col, new_size,
1307 objects[i].size);
1308 continue;
1309 }
1310 /* DISK_STORAGE */
1311 ret = write_disk_storage_file(t, i, objects + i, ds_name);
1312 if (ret < 0)
1313 goto rollback;
1314 }
1315 ret = append_row_index(t, new_row_index);
1316 if (ret < 0)
1317 goto rollback;
1318 ret = map_table(t, MAP_TBL_FL_VERIFY_INDEX);
1319 if (ret < 0) { /* truncate index and rollback changes */
1320 char *filename = index_filename(t->desc);
1321 if (filename)
1322 truncate_file(filename, t->row_index_size);
1323 free(filename);
1324 goto rollback;
1325 }
1326 /* pass 3: add entry to rbtrees */
1327 if (t->num_volatile_columns) {
1328 ret = -E_OSL_NOMEM;
1329 volatile_objs = calloc(t->num_volatile_columns,
1330 sizeof(struct osl_object));
1331 if (!volatile_objs)
1332 goto out;
1333 FOR_EACH_VOLATILE_COLUMN(i, t, cd)
1334 volatile_objs[t->columns[i].volatile_num] = objects[i];
1335 }
1336 t->num_rows++;
1337 // DEBUG_LOG("adding new entry as row #%d\n", t->num_rows - 1);
1338 ret = add_row_to_rbtrees(t, t->num_rows - 1, volatile_objs, row);
1339 if (ret < 0)
1340 goto out;
1341 // DEBUG_LOG("added new entry as row #%d\n", t->num_rows - 1);
1342 ret = 1;
1343 goto out;
1344 rollback: /* rollback all changes made, ignore further errors */
1345 for (i--; i >= 0; i--) {
1346 cd = get_column_description(t->desc, i);
1347 enum osl_storage_type st = cd->storage_type;
1348 if (st == OSL_NO_STORAGE)
1349 continue;
1350
1351 if (st == OSL_MAPPED_STORAGE)
1352 truncate_mapped_file(t, i, objects[i].size);
1353 else /* disk storage */
1354 delete_disk_storage_file(t, i, ds_name);
1355 }
1356 /* ignore error and return previous error value */
1357 map_table(t, MAP_TBL_FL_VERIFY_INDEX);
1358 out:
1359 free(new_row_index);
1360 free(ds_name);
1361 free(rb_parents);
1362 free(rb_links);
1363 return ret;
1364 }
1365
1366 __export int osl_add_row(struct osl_table *t, struct osl_object *objects)
1367 {
1368 return osl_add_and_get_row(t, objects, NULL);
1369 }
1370
1371 __export int osl_get_object(const struct osl_table *t, const struct osl_row *r,
1372 unsigned col_num, struct osl_object *object)
1373 {
1374 const struct osl_column_description *cd;
1375
1376 if (!t)
1377 return -E_OSL_BAD_TABLE;
1378 cd = get_column_description(t->desc, col_num);
1379 /* col must not be disk storage */
1380 if (cd->storage_type == OSL_DISK_STORAGE)
1381 return -E_OSL_BAD_STORAGE_TYPE;
1382 if (cd->storage_type == OSL_MAPPED_STORAGE)
1383 return get_mapped_object(t, col_num, r->num, object);
1384 /* volatile */
1385 *object = r->volatile_objects[t->columns[col_num].volatile_num];
1386 return 1;
1387 }
1388
1389 __export int osl_del_row(struct osl_table *t, struct osl_row *row)
1390 {
1391 struct osl_row *r = row;
1392 int i, ret;
1393 const struct osl_column_description *cd;
1394
1395 if (!t)
1396 return -E_OSL_BAD_TABLE;
1397 INFO_LOG("deleting row %p\n", row);
1398
1399 if (t->num_disk_storage_columns) {
1400 char *ds_name;
1401 ret = disk_storage_name_of_row(t, r, &ds_name);
1402 if (ret < 0)
1403 goto out;
1404 FOR_EACH_DISK_STORAGE_COLUMN(i, t, cd)
1405 delete_disk_storage_file(t, i, ds_name);
1406 free(ds_name);
1407 }
1408 FOR_EACH_COLUMN(i, t->desc, cd) {
1409 struct osl_column *col = t->columns + i;
1410 enum osl_storage_type st = cd->storage_type;
1411 remove_rb_node(t, i, r);
1412 if (st == OSL_MAPPED_STORAGE)
1413 continue;
1414 if (st == OSL_NO_STORAGE && !(cd->storage_flags & OSL_DONT_FREE))
1415 free(r->volatile_objects[col->volatile_num].data);
1416 }
1417 if (t->num_mapped_columns) {
1418 ret = mark_row_invalid(t, r->num);
1419 if (ret < 0)
1420 goto out;
1421 t->num_invalid_rows++;
1422 } else
1423 t->num_rows--;
1424 ret = 1;
1425 out:
1426 free(r->volatile_objects);
1427 free(r);
1428 return ret;
1429 }
1430
1431 /* test if column has an rbtree */
1432 static int check_rbtree_col(const struct osl_table *t, unsigned col_num,
1433 struct osl_column **col)
1434 {
1435 if (!t)
1436 return -E_OSL_BAD_TABLE;
1437 if (!(get_column_description(t->desc, col_num)->storage_flags & OSL_RBTREE))
1438 return -E_OSL_BAD_STORAGE_FLAGS;
1439 *col = t->columns + col_num;
1440 return 1;
1441 }
1442
1443 __export int osl_get_row(const struct osl_table *t, unsigned col_num,
1444 const struct osl_object *obj, struct osl_row **result)
1445 {
1446 int ret;
1447 struct rb_node *node;
1448 struct osl_row *row;
1449 struct osl_column *col;
1450
1451 *result = NULL;
1452 ret = check_rbtree_col(t, col_num, &col);
1453 if (ret < 0)
1454 return ret;
1455 ret = search_rbtree(obj, t, col_num, &node, NULL);
1456 if (ret < 0)
1457 return ret;
1458 row = get_row_pointer(node, t->columns[col_num].rbtree_num);
1459 *result = row;
1460 return 1;
1461 }
1462
1463 static int rbtree_loop(struct osl_column *col, void *private_data,
1464 osl_rbtree_loop_func *func)
1465 {
1466 struct rb_node *n, *tmp;
1467
1468 /* this for-loop is safe against removal of an entry */
1469 for (n = rb_first(&col->rbtree), tmp = n? rb_next(n) : NULL;
1470 n;
1471 n = tmp, tmp = tmp? rb_next(tmp) : NULL) {
1472 struct osl_row *r = get_row_pointer(n, col->rbtree_num);
1473 if (func(r, private_data) < 0)
1474 return -E_OSL_LOOP;
1475 }
1476 return 1;
1477 }
1478
1479 static int rbtree_loop_reverse(struct osl_column *col, void *private_data,
1480 osl_rbtree_loop_func *func)
1481 {
1482 struct rb_node *n, *tmp;
1483
1484 /* safe against removal of an entry */
1485 for (n = rb_last(&col->rbtree), tmp = n? rb_prev(n) : NULL;
1486 n;
1487 n = tmp, tmp = tmp? rb_prev(tmp) : NULL) {
1488 struct osl_row *r = get_row_pointer(n, col->rbtree_num);
1489 if (func(r, private_data) < 0)
1490 return -E_OSL_LOOP;
1491 }
1492 return 1;
1493 }
1494
1495 __export int osl_rbtree_loop(const struct osl_table *t, unsigned col_num,
1496 void *private_data, osl_rbtree_loop_func *func)
1497 {
1498 struct osl_column *col;
1499
1500 int ret = check_rbtree_col(t, col_num, &col);
1501 if (ret < 0)
1502 return ret;
1503 return rbtree_loop(col, private_data, func);
1504 }
1505
1506 __export int osl_rbtree_loop_reverse(const struct osl_table *t, unsigned col_num,
1507 void *private_data, osl_rbtree_loop_func *func)
1508 {
1509 struct osl_column *col;
1510
1511 int ret = check_rbtree_col(t, col_num, &col);
1512 if (ret < 0)
1513 return ret;
1514 return rbtree_loop_reverse(col, private_data, func);
1515 }
1516
1517 /* TODO: Rollback changes on errors */
1518 static int rename_disk_storage_objects(struct osl_table *t,
1519 struct osl_object *old_obj, struct osl_object *new_obj)
1520 {
1521 int i, ret;
1522 const struct osl_column_description *cd;
1523 char *old_ds_name, *new_ds_name;
1524
1525 if (!t->num_disk_storage_columns)
1526 return 1; /* nothing to do */
1527 if (old_obj->size == new_obj->size && !memcmp(new_obj->data,
1528 old_obj->data, new_obj->size))
1529 return 1; /* object did not change */
1530 old_ds_name = disk_storage_name_of_object(t, old_obj);
1531 new_ds_name = disk_storage_name_of_object(t, new_obj);
1532 ret = -E_OSL_NOMEM;
1533 if (!old_ds_name || ! new_ds_name)
1534 goto out;
1535
1536 FOR_EACH_DISK_STORAGE_COLUMN(i, t, cd) {
1537 char *old_filename, *new_filename;
1538 ret = create_disk_storage_object_dir(t, i, new_ds_name);
1539 if (ret < 0)
1540 goto out;
1541 old_filename = disk_storage_path(t, i, old_ds_name);
1542 new_filename = disk_storage_path(t, i, new_ds_name);
1543 if (!old_filename || !new_filename)
1544 ret = -E_OSL_NOMEM;
1545 else
1546 ret = osl_rename(old_filename, new_filename);
1547 free(old_filename);
1548 free(new_filename);
1549 if (ret < 0)
1550 goto out;
1551 }
1552 ret = 1;
1553 out:
1554 free(old_ds_name);
1555 free(new_ds_name);
1556 return ret;
1557
1558 }
1559
1560 __export int osl_update_object(struct osl_table *t, const struct osl_row *r,
1561 unsigned col_num, struct osl_object *obj)
1562 {
1563 struct osl_column *col;
1564 const struct osl_column_description *cd;
1565 int ret;
1566
1567 if (!t)
1568 return -E_OSL_BAD_TABLE;
1569 col = &t->columns[col_num];
1570 cd = get_column_description(t->desc, col_num);
1571 DEBUG_LOG("updating column %u of %s\n", col_num, t->desc->name);
1572 if (cd->storage_flags & OSL_RBTREE) {
1573 if (search_rbtree(obj, t, col_num, NULL, NULL) > 0)
1574 return -E_OSL_RB_KEY_EXISTS;
1575 }
1576 if (cd->storage_flags & OSL_FIXED_SIZE) {
1577 if (obj->size != cd->data_size)
1578 return -E_OSL_BAD_DATA_SIZE;
1579 }
1580 remove_rb_node(t, col_num, r);
1581 if (cd->storage_type == OSL_NO_STORAGE) { /* TODO: If fixed size, reuse object? */
1582 if (!(cd->storage_flags & OSL_DONT_FREE))
1583 free(r->volatile_objects[col->volatile_num].data);
1584 r->volatile_objects[col->volatile_num] = *obj;
1585 } else if (cd->storage_type == OSL_DISK_STORAGE) {
1586 char *ds_name;
1587 ret = disk_storage_name_of_row(t, r, &ds_name);
1588 if (ret < 0)
1589 return ret;
1590 ret = delete_disk_storage_file(t, col_num, ds_name);
1591 if (ret < 0 && ret != -E_OSL_NOENT) {
1592 free(ds_name);
1593 return ret;
1594 }
1595 ret = write_disk_storage_file(t, col_num, obj, ds_name);
1596 free(ds_name);
1597 if (ret < 0)
1598 return ret;
1599 } else { /* mapped storage */
1600 struct osl_object old_obj;
1601 ret = get_mapped_object(t, col_num, r->num, &old_obj);
1602 if (ret < 0)
1603 return ret;
1604 /*
1605 * If the updated column is the disk storage name column, the
1606 * disk storage name changes, so we have to rename all disk
1607 * storage objects accordingly.
1608 */
1609 if (col_num == t->disk_storage_name_column) {
1610 ret = rename_disk_storage_objects(t, &old_obj, obj);
1611 if (ret < 0)
1612 return ret;
1613 }
1614 if (cd->storage_flags & OSL_FIXED_SIZE)
1615 memcpy(old_obj.data, obj->data, cd->data_size);
1616 else { /* TODO: if the size doesn't change, use old space */
1617 uint32_t new_data_map_size;
1618 char *row_index;
1619 ret = get_row_index(t, r->num, &row_index);
1620 if (ret < 0)
1621 return ret;
1622 unmap_column(t, col_num);
1623 ret = append_map_file(t, col_num, obj,
1624 &new_data_map_size);
1625 if (ret < 0)
1626 return ret;
1627 ret = map_column(t, col_num);
1628 if (ret < 0)
1629 return ret;
1630 update_cell_index(row_index, col, new_data_map_size,
1631 obj->size);
1632 }
1633 }
1634 if (cd->storage_flags & OSL_RBTREE) {
1635 ret = insert_rbtree(t, col_num, r, obj);
1636 if (ret < 0)
1637 return ret;
1638 }
1639 return 1;
1640 }
1641
1642 __export int osl_open_disk_object(const struct osl_table *t, const struct osl_row *r,
1643 unsigned col_num, struct osl_object *obj)
1644 {
1645 const struct osl_column_description *cd;
1646 char *ds_name, *filename;
1647 int ret;
1648
1649 if (!t)
1650 return -E_OSL_BAD_TABLE;
1651 cd = get_column_description(t->desc, col_num);
1652 if (cd->storage_type != OSL_DISK_STORAGE)
1653 return -E_OSL_BAD_STORAGE_TYPE;
1654
1655 ret = disk_storage_name_of_row(t, r, &ds_name);
1656 if (ret < 0)
1657 return ret;
1658 filename = disk_storage_path(t, col_num, ds_name);
1659 free(ds_name);
1660 if (!filename)
1661 return -E_OSL_NOMEM;
1662 DEBUG_LOG("filename: %s\n", filename);
1663 ret = mmap_full_file(filename, O_RDONLY, &obj->data, &obj->size, NULL);
1664 free(filename);
1665 return ret;
1666 }
1667
1668 __export int osl_close_disk_object(struct osl_object *obj)
1669 {
1670 return osl_munmap(obj->data, obj->size);
1671 }
1672
1673 __export int osl_get_num_rows(const struct osl_table *t, unsigned *num_rows)
1674 {
1675 if (!t)
1676 return -E_OSL_BAD_TABLE;
1677 assert(t->num_rows >= t->num_invalid_rows);
1678 *num_rows = t->num_rows - t->num_invalid_rows;
1679 return 1;
1680 }
1681
1682 __export int osl_get_rank(const struct osl_table *t, struct osl_row *r,
1683 unsigned col_num, unsigned *rank)
1684 {
1685 struct osl_object obj;
1686 struct osl_column *col;
1687 struct rb_node *node;
1688 int ret = check_rbtree_col(t, col_num, &col);
1689
1690 if (ret < 0)
1691 return ret;
1692 ret = osl_get_object(t, r, col_num, &obj);
1693 if (ret < 0)
1694 return ret;
1695 ret = search_rbtree(&obj, t, col_num, &node, NULL);
1696 if (ret < 0)
1697 return ret;
1698 ret = rb_rank(node, rank);
1699 if (ret < 0)
1700 return -E_OSL_BAD_ROW;
1701 return 1;
1702 }
1703
1704 __export int osl_get_nth_row(const struct osl_table *t, unsigned col_num,
1705 unsigned n, struct osl_row **result)
1706 {
1707 struct osl_column *col;
1708 struct rb_node *node;
1709 unsigned num_rows;
1710 int ret;
1711
1712 *result = NULL;
1713 if (n == 0)
1714 return -E_OSL_RB_KEY_NOT_FOUND;
1715 ret = osl_get_num_rows(t, &num_rows);
1716 if (ret < 0)
1717 return ret;
1718 if (n > num_rows)
1719 return -E_OSL_RB_KEY_NOT_FOUND;
1720 ret = check_rbtree_col(t, col_num, &col);
1721 if (ret < 0)
1722 return ret;
1723 node = rb_nth(col->rbtree.rb_node, n);
1724 if (!node)
1725 return -E_OSL_RB_KEY_NOT_FOUND;
1726 *result = get_row_pointer(node, col->rbtree_num);
1727 return 1;
1728 }
1729
1730 __export int osl_rbtree_first_row(const struct osl_table *t, unsigned col_num,
1731 struct osl_row **result)
1732 {
1733 return osl_get_nth_row(t, col_num, 1, result);
1734 }
1735
1736 __export int osl_rbtree_last_row(const struct osl_table *t, unsigned col_num,
1737 struct osl_row **result)
1738 {
1739 unsigned num_rows;
1740 int ret = osl_get_num_rows(t, &num_rows);
1741
1742 if (ret < 0)
1743 return ret;
1744 return osl_get_nth_row(t, col_num, num_rows, result);
1745 }