2 * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file attribute.c Attribute handling functions. */
22 static struct osl_table *attribute_table;
23 static int greatest_att_bitnum;
25 /** The columns of the attribute table. */
26 enum attribute_table_columns {
27 /** The bit number (0-63). */
29 /** The name of the attribute. */
31 /** Number of columns in this table. */
35 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
37 const unsigned char *c1 = (const unsigned char*)obj1->data;
38 const unsigned char *c2 = (const unsigned char*)obj2->data;
46 static struct osl_column_description att_cols[] = {
48 .storage_type = OSL_MAPPED_STORAGE,
49 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
51 .compare_function = char_compare,
55 .storage_type = OSL_MAPPED_STORAGE,
56 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
58 .compare_function = string_compare,
62 static struct osl_table_description attribute_table_desc = {
64 .num_columns = NUM_ATT_COLUMNS,
66 .column_descriptions = att_cols
69 static void find_greatest_att_bitnum(void)
74 struct osl_object obj = {.data = &c, .size = 1};
75 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
77 greatest_att_bitnum = c;
81 PARA_INFO_LOG("no attributes\n");
82 greatest_att_bitnum = -E_NO_ATTRIBUTES;
86 * Retrieve the identifier (number) of an attribute.
88 * \param att_name The name of the attribute.
89 * \param bitnum Result pointer.
91 * \return Positive on success, negative on errors.
93 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
95 struct osl_object obj = {.data = (char *)att_name,
96 .size = strlen(att_name) + 1};
98 int ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
102 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj));
105 *bitnum = *(unsigned char *)obj.data;
110 * Flags used by the lsatt command.
112 * \param \sa com_lsatt().
115 /** Whether "-a" was given for the lsatt command. */
116 LSATT_FLAG_SORT_BY_ID = 1,
117 /** Whether "-l" was given for the lsatt command. */
119 /** Reverse sort order. */
120 LSATT_FLAG_REVERSE = 4
123 /** Data passed to the action function of lsatt */
124 struct lsatt_action_data {
125 /** The result buffer. */
126 struct para_buffer pb;
127 /** The given flags for the lsatt command. */
131 static int print_attribute(struct osl_table *table, struct osl_row *row,
132 const char *name, void *data)
134 struct lsatt_action_data *laad = data;
135 struct osl_object bitnum_obj;
138 if (!(laad->flags & LSATT_FLAG_LONG))
139 return para_printf(&laad->pb, "%s\n", name);
140 ret = osl(osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj));
142 para_printf(&laad->pb, "%s: %s\n", name, para_strerror(-ret));
145 return para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
149 static void com_lsatt_callback(int fd, const struct osl_object *query)
151 struct lsatt_action_data laad = {
152 .flags = *(unsigned *) query->data,
154 .max_size = shm_get_shmmax(),
155 .private_data = &(struct afs_max_size_handler_data) {
159 .max_size_handler = afs_max_size_handler
163 struct pattern_match_data pmd = {
164 .table = attribute_table,
165 .loop_col_num = ATTCOL_NAME,
166 .match_col_num = ATTCOL_NAME,
167 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
168 .size = query->size - sizeof(laad.flags)},
169 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
171 .action = print_attribute
173 if (laad.flags & LSATT_FLAG_SORT_BY_ID)
174 pmd.loop_col_num = ATTCOL_BITNUM;
175 if (laad.flags & LSATT_FLAG_REVERSE)
176 pmd.pm_flags |= PM_REVERSE_LOOP;
177 for_each_matching_row(&pmd);
179 pass_buffer_as_shm(fd, SBD_OUTPUT, laad.pb.buf, laad.pb.offset);
183 int com_lsatt(struct command_context *cc)
186 struct osl_object options = {.data = &flags, .size = sizeof(flags)};
189 for (i = 1; i < cc->argc; i++) {
190 const char *arg = cc->argv[i];
193 if (!strcmp(arg, "--")) {
197 if (!strcmp(arg, "-i")) {
198 flags |= LSATT_FLAG_SORT_BY_ID;
201 if (!strcmp(arg, "-l")) {
202 flags |= LSATT_FLAG_LONG;
205 if (!strcmp(arg, "-r")) {
206 flags |= LSATT_FLAG_REVERSE;
210 ret = send_option_arg_callback_request(&options, cc->argc - i, cc->argv + i,
211 com_lsatt_callback, afs_cb_result_handler, cc);
213 send_strerror(cc, -ret);
214 else if (ret == 0 && cc->argc > 1)
215 ret = send_sb_va(&cc->scc, SBD_ERROR_LOG, "no matches\n");
219 struct addatt_event_data {
221 unsigned char bitnum;
225 static void com_addatt_callback(int fd, const struct osl_object *query)
228 int ret = 1, ret2 = 0;
229 struct para_buffer pb = {
230 .max_size = shm_get_shmmax(),
231 .private_data = &(struct afs_max_size_handler_data) {
235 .max_size_handler = afs_max_size_handler
239 for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
240 struct osl_object objs[NUM_ATT_COLUMNS];
242 unsigned char bitnum;
243 struct addatt_event_data aed;
246 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
247 ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
252 ret = get_attribute_bitnum_by_name(p, &bitnum);
254 ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
259 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
261 objs[ATTCOL_BITNUM].size = 1;
262 /* find smallest unused attribute */
263 for (bitnum = 0; bitnum < 64; bitnum++) {
264 objs[ATTCOL_BITNUM].data = &bitnum;
265 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
266 &objs[ATTCOL_BITNUM], &row));
267 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
268 break; /* this bitnum is unused, use it */
269 if (ret < 0) /* error */
271 /* this bit is already in use, try next bit */
274 ret = -E_ATT_TABLE_FULL;
277 objs[ATTCOL_NAME].data = p;
278 objs[ATTCOL_NAME].size = len + 1;
279 ret = osl(osl_add_row(attribute_table, objs));
284 afs_event(ATTRIBUTE_ADD, &pb, &aed);
285 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
288 if (ret < 0 && ret2 >= 0)
289 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
291 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
295 int com_addatt(struct command_context *cc)
300 return -E_ATTR_SYNTAX;
301 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
302 com_addatt_callback, afs_cb_result_handler, cc);
304 send_strerror(cc, -ret);
308 static void com_mvatt_callback(int fd, const struct osl_object *query)
310 char *old = query->data;
311 size_t size = strlen(old) + 1;
312 char *new = old + size;
313 struct osl_object obj = {.data = old, .size = size};
315 struct para_buffer pb = {
316 .max_size = shm_get_shmmax(),
317 .private_data = &(struct afs_max_size_handler_data) {
321 .max_size_handler = afs_max_size_handler,
325 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
329 obj.size = strlen(new) + 1;
330 ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
333 para_printf(&pb, "%s\n", para_strerror(-ret));
335 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
337 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
341 int com_mvatt(struct command_context *cc)
346 return -E_ATTR_SYNTAX;
347 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
348 com_mvatt_callback, afs_cb_result_handler, cc);
350 send_strerror(cc, -ret);
354 /** Data passed to the action handler of com_rmatt(). */
355 struct remove_attribute_action_data {
356 /** Message buffer. */
357 struct para_buffer pb;
358 /** Number of attributes removed. */
360 /** Bitwise "or" of the removed attributes. */
361 uint64_t mask_of_removed_atts;
364 static int remove_attribute(struct osl_table *table, struct osl_row *row,
365 const char *name, void *data)
367 struct remove_attribute_action_data *raad = data;
369 struct rmatt_event_data red = {.name = name};
371 ret = get_attribute_bitnum_by_name(name, &red.bitnum);
373 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
374 ret = osl(osl_del_row(table, row));
376 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
377 ret = para_printf(&raad->pb, "removed attribute %s\n", name);
379 raad->mask_of_removed_atts |= (1 << red.bitnum);
380 afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
384 static void com_rmatt_callback(int fd, const struct osl_object *query)
386 struct remove_attribute_action_data raad = {
389 .max_size = shm_get_shmmax(),
390 .private_data = &(struct afs_max_size_handler_data) {
394 .max_size_handler = afs_max_size_handler,
398 struct pattern_match_data pmd = {
399 .table = attribute_table,
401 .loop_col_num = ATTCOL_BITNUM,
402 .match_col_num = ATTCOL_NAME,
404 .action = remove_attribute
406 ret = for_each_matching_row(&pmd);
408 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
409 else if (!raad.num_removed)
410 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
411 if (ret2 >= 0 && raad.pb.offset)
412 pass_buffer_as_shm(fd, SBD_OUTPUT, raad.pb.buf, raad.pb.offset);
416 int com_rmatt(struct command_context *cc)
421 return -E_ATTR_SYNTAX;
422 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
423 com_rmatt_callback, afs_cb_result_handler, cc);
425 send_strerror(cc, -ret);
430 * Return a binary representation of the given attribute value.
432 * \param atts Pointer to the attribute value.
435 * This function prints a string of at most 64 characters plus the terminating
436 * \p NULL character into \a buf which must be provided by the caller and at
437 * least 65 bytes long. The "x" character is used for set attributes and "-" is
438 * used for unset attributes.
440 * In practice, not all 64 attributes are defined. In this case, the function
441 * only prints \a N + 1 characters where \a N is the greatest id of a defined
444 void get_attribute_bitmap(const uint64_t *atts, char *buf)
447 const uint64_t one = 1;
449 for (i = 0; i <= greatest_att_bitnum; i++)
450 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
455 * Get a string containing the set attributes in text form.
457 * \param atts The attribute bitmap.
458 * \param delim The delimiter to separate matching attribute names.
459 * \param text Result pointer.
461 * \return Positive on success, negative on errors. If no attributes have
462 * been defined, \a *text is NULL.
464 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
467 const uint64_t one = 1;
470 if (greatest_att_bitnum < 0) { /* no attributes available */
471 *text = para_strdup("(no attributes available)");
474 for (i = 0; i <= greatest_att_bitnum; i++) {
475 unsigned char bn = i;
476 struct osl_object obj = {.data = &bn, .size = 1};
479 if (!(*atts & (one << i)))
481 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
484 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
488 char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
492 *text = para_strdup(obj.data);
494 if (!*text) /* no attributes set */
495 *text = para_strdup("");
503 * Close the attribute table.
505 * \sa osl_close_table().
507 static void attribute_close(void)
509 osl_close_table(attribute_table, OSL_MARK_CLEAN);
510 attribute_table = NULL;
514 * Open the attribute table.
516 * \param dir The database directory.
518 * \return Positive on success, negative on errors.
520 * \sa osl_open_table().
522 static int attribute_open(const char *dir)
526 attribute_table_desc.dir = dir;
527 ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
528 greatest_att_bitnum = -1; /* no atts available */
530 find_greatest_att_bitnum();
533 attribute_table = NULL;
534 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
539 static int attribute_create(const char *dir)
541 attribute_table_desc.dir = dir;
542 return osl(osl_create_table(&attribute_table_desc));
546 * Initialize the attribute table structure.
548 * \param t The table structure to initialize.
550 void attribute_init(struct afs_table *t)
552 t->open = attribute_open;
553 t->close = attribute_close;
554 t->create = attribute_create;