2 * Copyright (C) 1997-2013 Andre Noll <maan@systemlinux.org>
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_BITNUM,
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_NAME;
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 = cc->use_sideband?
216 send_sb_va(&cc->scc, SBD_ERROR_LOG, "no matches\n")
218 sc_send_va_buffer(&cc->scc, "no matches\n");
222 struct addatt_event_data {
224 unsigned char bitnum;
228 static void com_addatt_callback(int fd, const struct osl_object *query)
231 int ret = 1, ret2 = 0;
232 struct para_buffer pb = {
233 .max_size = shm_get_shmmax(),
234 .private_data = &(struct afs_max_size_handler_data) {
238 .max_size_handler = afs_max_size_handler
242 for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
243 struct osl_object objs[NUM_ATT_COLUMNS];
245 unsigned char bitnum;
246 struct addatt_event_data aed;
249 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
250 ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
255 ret = get_attribute_bitnum_by_name(p, &bitnum);
257 ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
262 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
264 objs[ATTCOL_BITNUM].size = 1;
265 /* find smallest unused attribute */
266 for (bitnum = 0; bitnum < 64; bitnum++) {
267 objs[ATTCOL_BITNUM].data = &bitnum;
268 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
269 &objs[ATTCOL_BITNUM], &row));
270 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
271 break; /* this bitnum is unused, use it */
272 if (ret < 0) /* error */
274 /* this bit is already in use, try next bit */
277 ret = -E_ATT_TABLE_FULL;
280 objs[ATTCOL_NAME].data = p;
281 objs[ATTCOL_NAME].size = len + 1;
282 ret = osl(osl_add_row(attribute_table, objs));
287 afs_event(ATTRIBUTE_ADD, &pb, &aed);
288 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
291 if (ret < 0 && ret2 >= 0)
292 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
294 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
298 int com_addatt(struct command_context *cc)
303 return -E_ATTR_SYNTAX;
304 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
305 com_addatt_callback, afs_cb_result_handler, cc);
307 send_strerror(cc, -ret);
311 static void com_mvatt_callback(int fd, const struct osl_object *query)
313 char *old = query->data;
314 size_t size = strlen(old) + 1;
315 char *new = old + size;
316 struct osl_object obj = {.data = old, .size = size};
318 struct para_buffer pb = {
319 .max_size = shm_get_shmmax(),
320 .private_data = &(struct afs_max_size_handler_data) {
324 .max_size_handler = afs_max_size_handler,
328 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
332 obj.size = strlen(new) + 1;
333 ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
336 para_printf(&pb, "%s\n", para_strerror(-ret));
338 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
340 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
344 int com_mvatt(struct command_context *cc)
349 return -E_ATTR_SYNTAX;
350 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
351 com_mvatt_callback, afs_cb_result_handler, cc);
353 send_strerror(cc, -ret);
357 /** Data passed to the action handler of com_rmatt(). */
358 struct remove_attribute_action_data {
359 /** Message buffer. */
360 struct para_buffer pb;
361 /** Numver of attributes removed. */
363 /** Bitwise "or" of the removed attributes. */
364 uint64_t mask_of_removed_atts;
367 static int remove_attribute(struct osl_table *table, struct osl_row *row,
368 const char *name, void *data)
370 struct remove_attribute_action_data *raad = data;
372 struct rmatt_event_data red = {.name = name};
374 ret = get_attribute_bitnum_by_name(name, &red.bitnum);
376 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
377 ret = osl(osl_del_row(table, row));
379 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
380 ret = para_printf(&raad->pb, "removed attribute %s\n", name);
382 raad->mask_of_removed_atts |= (1 << red.bitnum);
383 afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
387 static void com_rmatt_callback(int fd, const struct osl_object *query)
389 struct remove_attribute_action_data raad = {
392 .max_size = shm_get_shmmax(),
393 .private_data = &(struct afs_max_size_handler_data) {
397 .max_size_handler = afs_max_size_handler,
401 struct pattern_match_data pmd = {
402 .table = attribute_table,
404 .loop_col_num = ATTCOL_BITNUM,
405 .match_col_num = ATTCOL_NAME,
407 .action = remove_attribute
409 ret = for_each_matching_row(&pmd);
411 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
412 else if (!raad.num_removed)
413 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
414 if (ret2 >= 0 && raad.pb.offset)
415 pass_buffer_as_shm(fd, SBD_OUTPUT, raad.pb.buf, raad.pb.offset);
419 int com_rmatt(struct command_context *cc)
424 return -E_ATTR_SYNTAX;
425 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
426 com_rmatt_callback, afs_cb_result_handler, cc);
428 send_strerror(cc, -ret);
433 * Return a binary representation of the given attribute value.
435 * \param atts Pointer to the attribute value.
438 * This function prints a string of at most 64 characters plus the terminating
439 * \p NULL character into \a buf which must be provided by the caller and at
440 * least 65 bytes long. The "x" character is used for set attributes and "-" is
441 * used for unset attributes.
443 * In practice, not all 64 attributes are defined. In this case, the function
444 * only prints \a N + 1 charaters where \a N is the greatest id of a defined
447 void get_attribute_bitmap(const uint64_t *atts, char *buf)
450 const uint64_t one = 1;
452 for (i = 0; i <= greatest_att_bitnum; i++)
453 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
458 * Get a string containing the set attributes in text form.
460 * \param atts The attribute bitmap.
461 * \param delim The delimiter to separate matching attribute names.
462 * \param text Result pointer.
464 * \return Positive on success, negative on errors. If no attributes have
465 * been defined, \a *text is NULL.
467 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
470 const uint64_t one = 1;
473 if (greatest_att_bitnum < 0) { /* no attributes available */
474 *text = para_strdup("(no attributes available)");
477 for (i = 0; i <= greatest_att_bitnum; i++) {
478 unsigned char bn = i;
479 struct osl_object obj = {.data = &bn, .size = 1};
482 if (!(*atts & (one << i)))
484 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
487 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
491 char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
495 *text = para_strdup(obj.data);
497 if (!*text) /* no attributes set */
498 *text = para_strdup("");
506 * Close the attribute table.
508 * \sa osl_close_table().
510 static void attribute_close(void)
512 osl_close_table(attribute_table, OSL_MARK_CLEAN);
513 attribute_table = NULL;
517 * Open the attribute table.
519 * \param dir The database directory.
521 * \return Positive on success, negative on errors.
523 * \sa osl_open_table().
525 static int attribute_open(const char *dir)
529 attribute_table_desc.dir = dir;
530 ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
531 greatest_att_bitnum = -1; /* no atts available */
533 find_greatest_att_bitnum();
536 attribute_table = NULL;
537 if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
542 static int attribute_create(const char *dir)
544 attribute_table_desc.dir = dir;
545 return osl(osl_create_table(&attribute_table_desc));
549 * Initialize the attribute table structure.
551 * \param t The table structure to initialize.
553 void attribute_init(struct afs_table *t)
555 t->open = attribute_open;
556 t->close = attribute_close;
557 t->create = attribute_create;