2 * Copyright (C) 1997-2012 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) {
158 .max_size_handler = afs_max_size_handler
162 struct pattern_match_data pmd = {
163 .table = attribute_table,
164 .loop_col_num = ATTCOL_BITNUM,
165 .match_col_num = ATTCOL_NAME,
166 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
167 .size = query->size - sizeof(laad.flags)},
168 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
170 .action = print_attribute
172 if (laad.flags & LSATT_FLAG_SORT_BY_ID)
173 pmd.loop_col_num = ATTCOL_NAME;
174 if (laad.flags & LSATT_FLAG_REVERSE)
175 pmd.pm_flags |= PM_REVERSE_LOOP;
176 for_each_matching_row(&pmd);
178 pass_buffer_as_shm(fd, laad.pb.buf, laad.pb.offset);
182 int com_lsatt(struct command_context *cc)
185 struct osl_object options = {.data = &flags, .size = sizeof(flags)};
188 for (i = 1; i < cc->argc; i++) {
189 const char *arg = cc->argv[i];
192 if (!strcmp(arg, "--")) {
196 if (!strcmp(arg, "-i")) {
197 flags |= LSATT_FLAG_SORT_BY_ID;
200 if (!strcmp(arg, "-l")) {
201 flags |= LSATT_FLAG_LONG;
204 if (!strcmp(arg, "-r")) {
205 flags |= LSATT_FLAG_REVERSE;
209 ret = send_option_arg_callback_request(&options, cc->argc - i, cc->argv + i,
210 com_lsatt_callback, afs_cb_result_handler, cc);
214 ret = sc_send_va_buffer(&cc->scc, "no matches\n");
216 send_strerror(cc, -ret);
220 static void com_setatt_callback(__a_unused int fd, const struct osl_object *query)
223 uint64_t add_mask = 0, del_mask = 0;
226 struct osl_object obj;
229 for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
233 ret = -E_ATTR_SYNTAX;
237 if (c != '+' && c != '-')
242 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
245 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM,
250 add_mask |= (1UL << *(unsigned char *)obj.data);
252 del_mask |= (1UL << *(unsigned char *)obj.data);
254 ret = -E_ATTR_SYNTAX;
255 if (!add_mask && !del_mask)
257 PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
258 (long long unsigned)del_mask);
259 for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
260 struct afs_info old_afsi, new_afsi;
261 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
264 ret = aft_get_row_of_path(p, &aced.aft_row);
267 ret = get_afsi_object_of_row(aced.aft_row, &obj);
270 ret = load_afsi(&old_afsi, &obj);
274 new_afsi.attributes |= add_mask;
275 new_afsi.attributes &= ~del_mask;
276 save_afsi(&new_afsi, &obj); /* in-place update */
277 afs_event(AFSI_CHANGE, NULL, &aced);
281 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
284 int com_setatt(struct command_context *cc)
287 return -E_ATTR_SYNTAX;
288 return send_standard_callback_request(cc->argc - 1, cc->argv + 1,
289 com_setatt_callback, NULL, NULL);
292 struct addatt_event_data {
294 unsigned char bitnum;
298 static void com_addatt_callback(int fd, const struct osl_object *query)
301 int ret = 1, ret2 = 0;
302 struct para_buffer pb = {
303 .max_size = shm_get_shmmax(),
304 .private_data = &(struct afs_max_size_handler_data) {
307 .max_size_handler = afs_max_size_handler
311 for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
312 struct osl_object objs[NUM_ATT_COLUMNS];
314 unsigned char bitnum;
315 struct addatt_event_data aed;
318 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
319 ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
324 ret = get_attribute_bitnum_by_name(p, &bitnum);
326 ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
331 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
333 objs[ATTCOL_BITNUM].size = 1;
334 /* find smallest unused attribute */
335 for (bitnum = 0; bitnum < 64; bitnum++) {
336 objs[ATTCOL_BITNUM].data = &bitnum;
337 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
338 &objs[ATTCOL_BITNUM], &row));
339 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
340 break; /* this bitnum is unused, use it */
341 if (ret < 0) /* error */
343 /* this bit is already in use, try next bit */
346 ret = -E_ATT_TABLE_FULL;
349 objs[ATTCOL_NAME].data = p;
350 objs[ATTCOL_NAME].size = len + 1;
351 ret = osl(osl_add_row(attribute_table, objs));
356 afs_event(ATTRIBUTE_ADD, &pb, &aed);
357 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
360 if (ret < 0 && ret2 >= 0)
361 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
363 pass_buffer_as_shm(fd, pb.buf, pb.offset);
367 int com_addatt(struct command_context *cc)
372 return -E_ATTR_SYNTAX;
373 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
374 com_addatt_callback, afs_cb_result_handler, cc);
376 send_strerror(cc, -ret);
380 static void com_mvatt_callback(int fd, const struct osl_object *query)
382 char *old = query->data;
383 size_t size = strlen(old) + 1;
384 char *new = old + size;
385 struct osl_object obj = {.data = old, .size = size};
387 struct para_buffer pb = {
388 .max_size = shm_get_shmmax(),
389 .private_data = &(struct afs_max_size_handler_data) {
392 .max_size_handler = afs_max_size_handler,
396 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
400 obj.size = strlen(new) + 1;
401 ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
404 para_printf(&pb, "%s\n", para_strerror(-ret));
406 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
408 pass_buffer_as_shm(fd, pb.buf, pb.offset);
412 int com_mvatt(struct command_context *cc)
417 return -E_ATTR_SYNTAX;
418 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
419 com_mvatt_callback, afs_cb_result_handler, cc);
421 send_strerror(cc, -ret);
425 /** Data passed to the action handler of com_rmatt(). */
426 struct remove_attribute_action_data {
427 /** Message buffer. */
428 struct para_buffer pb;
429 /** Numver of attributes removed. */
431 /** Bitwise "or" of the removed attributes. */
432 uint64_t mask_of_removed_atts;
435 static int remove_attribute(struct osl_table *table, struct osl_row *row,
436 const char *name, void *data)
438 struct remove_attribute_action_data *raad = data;
440 struct rmatt_event_data red = {.name = name};
442 ret = get_attribute_bitnum_by_name(name, &red.bitnum);
444 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
445 ret = osl(osl_del_row(table, row));
447 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
448 ret = para_printf(&raad->pb, "removed attribute %s\n", name);
450 raad->mask_of_removed_atts |= (1 << red.bitnum);
451 afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
455 static void com_rmatt_callback(int fd, const struct osl_object *query)
457 struct remove_attribute_action_data raad = {
460 .max_size = shm_get_shmmax(),
461 .private_data = &(struct afs_max_size_handler_data) {
464 .max_size_handler = afs_max_size_handler,
468 struct pattern_match_data pmd = {
469 .table = attribute_table,
471 .loop_col_num = ATTCOL_BITNUM,
472 .match_col_num = ATTCOL_NAME,
474 .action = remove_attribute
476 ret = for_each_matching_row(&pmd);
478 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
479 else if (!raad.num_removed)
480 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
481 if (ret2 >= 0 && raad.pb.offset)
482 pass_buffer_as_shm(fd, raad.pb.buf, raad.pb.offset);
486 int com_rmatt(struct command_context *cc)
491 return -E_ATTR_SYNTAX;
492 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
493 com_rmatt_callback, afs_cb_result_handler, cc);
495 send_strerror(cc, -ret);
500 * Return a binary representation of the given attribute value.
502 * \param atts Pointer to the attribute value.
505 * This function prints a string of at most 64 characters plus the terminating
506 * \p NULL character into \a buf which must be provided by the caller and at
507 * least 65 bytes long. The "x" character is used for set attributes and "-" is
508 * used for unset attributes.
510 * In practice, not all 64 attributes are defined. In this case, the function
511 * only prints \a N + 1 charaters where \a N is the greatest id of a defined
514 void get_attribute_bitmap(const uint64_t *atts, char *buf)
517 const uint64_t one = 1;
519 for (i = 0; i <= greatest_att_bitnum; i++)
520 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
525 * Get a string containing the set attributes in text form.
527 * \param atts The attribute bitmap.
528 * \param delim The delimiter to separate matching attribute names.
529 * \param text Result pointer.
531 * \return Positive on success, negative on errors. If no attributes have
532 * been defined, \a *text is NULL.
534 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
537 const uint64_t one = 1;
540 if (greatest_att_bitnum < 0) { /* no attributes available */
541 *text = para_strdup("(no attributes available)");
544 for (i = 0; i <= greatest_att_bitnum; i++) {
545 unsigned char bn = i;
546 struct osl_object obj = {.data = &bn, .size = 1};
549 if (!(*atts & (one << i)))
551 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
554 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
558 char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
562 *text = para_strdup(obj.data);
564 if (!*text) /* no attributes set */
565 *text = para_strdup("");
573 * Close the attribute table.
575 * \sa osl_close_table().
577 static void attribute_close(void)
579 osl_close_table(attribute_table, OSL_MARK_CLEAN);
580 attribute_table = NULL;
584 * Open the attribute table.
586 * \param dir The database directory.
588 * \return Positive on success, negative on errors.
590 * \sa osl_open_table().
592 static int attribute_open(const char *dir)
596 attribute_table_desc.dir = dir;
597 ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
598 greatest_att_bitnum = -1; /* no atts available */
600 find_greatest_att_bitnum();
603 attribute_table = NULL;
604 if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
609 static int attribute_create(const char *dir)
611 attribute_table_desc.dir = dir;
612 return osl(osl_create_table(&attribute_table_desc));
616 * Initialize the attribute table structure.
618 * \param t The table structure to initialize.
620 void attribute_init(struct afs_table *t)
622 t->open = attribute_open;
623 t->close = attribute_close;
624 t->create = attribute_create;