1 /*****************************************************************************
2 * RRDtool 1.3.2 Copyright by Tobi Oetiker, 1997-2008
3 *****************************************************************************
4 * rrd_resize.c Alters size of an RRA
5 *****************************************************************************
6 * Initial version by Alex van den Bogaerdt
7 *****************************************************************************/
17 char *infilename, outfilename[11] = "resize.rrd";
23 unsigned long target_rra;
24 int grow = 0, shrink = 0;
26 rrd_file_t *rrd_file, *rrd_out_file;
29 if (!strcmp(infilename, "resize.rrd")) {
30 rrd_set_error("resize.rrd is a reserved name");
34 rrd_set_error("wrong number of parameters");
38 target_rra = strtol(argv[2], &endptr, 0);
40 if (!strcmp(argv[3], "GROW"))
42 else if (!strcmp(argv[3], "SHRINK"))
45 rrd_set_error("I can only GROW or SHRINK");
49 modify = strtol(argv[4], &endptr, 0);
52 rrd_set_error("Please grow or shrink with at least 1 row");
61 rrd_file = rrd_open(infilename, &rrdold, RRD_READWRITE | RRD_COPY);
62 if (rrd_file == NULL) {
67 if (rrd_lock(rrd_file) != 0) {
68 rrd_set_error("could not lock original RRD");
75 if (target_rra >= rrdold.stat_head->rra_cnt) {
76 rrd_set_error("no such RRA in this RRD");
83 if ((long) rrdold.rra_def[target_rra].row_cnt <= -modify) {
84 rrd_set_error("This RRA is not that big");
91 /* These need to be initialised before calling rrd_open() with
92 the RRD_CREATE flag */
93 if ((rrdnew.stat_head = (stat_head_t*)calloc(1, sizeof(stat_head_t))) == NULL) {
94 rrd_set_error("allocating stat_head for new RRD");
100 if ((rrdnew.rra_def = (rra_def_t *)malloc(sizeof(rra_def_t) * rrdold.stat_head->rra_cnt)) == NULL) {
101 rrd_set_error("allocating rra_def for new RRD");
105 rrd_close(rrd_out_file);
109 memcpy(rrdnew.stat_head,rrdold.stat_head,sizeof(stat_head_t));
110 memcpy(rrdnew.rra_def,rrdold.rra_def,sizeof(rra_def_t) * rrdold.stat_head->rra_cnt);
112 /* Set this so that the file will be created with the correct size */
113 rrdnew.rra_def[target_rra].row_cnt += modify;
115 rrd_out_file = rrd_open(outfilename, &rrdnew, RRD_READWRITE | RRD_CREAT);
116 if (rrd_out_file == NULL) {
117 rrd_set_error("Can't create '%s': %s", outfilename,
118 rrd_strerror(errno));
122 if (rrd_lock(rrd_out_file) != 0) {
123 rrd_set_error("could not lock new RRD");
126 rrd_close(rrd_out_file);
129 /*XXX: do one write for those parts of header that are unchanged */
130 if ((rrdnew.rra_ptr = (rra_ptr_t *)malloc(sizeof(rra_ptr_t) * rrdold.stat_head->rra_cnt)) == NULL) {
131 rrd_set_error("allocating rra_ptr for new RRD");
135 rrd_close(rrd_out_file);
139 /* Put this back the way it was so that the rest of the algorithm
140 below remains unchanged, it will be corrected later */
141 rrdnew.rra_def[target_rra].row_cnt -= modify;
143 rrdnew.ds_def = rrdold.ds_def;
144 rrdnew.live_head = rrdold.live_head;
145 rrdnew.pdp_prep = rrdold.pdp_prep;
146 rrdnew.cdp_prep = rrdold.cdp_prep;
147 memcpy(rrdnew.rra_ptr,rrdold.rra_ptr,sizeof(rra_ptr_t) * rrdold.stat_head->rra_cnt);
150 version = atoi(rrdold.stat_head->version);
157 rrdold.stat_head->version[3] = '3';
160 rrd_set_error("Do not know how to handle RRD version %s",
161 rrdold.stat_head->version);
165 rrd_close(rrd_out_file);
170 /* XXX: Error checking? */
171 rrd_write(rrd_out_file, rrdnew.stat_head, sizeof(stat_head_t) * 1);
172 rrd_write(rrd_out_file, rrdnew.ds_def,
173 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt);
174 rrd_write(rrd_out_file, rrdnew.rra_def,
175 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
176 rrd_write(rrd_out_file, rrdnew.live_head, sizeof(live_head_t) * 1);
177 rrd_write(rrd_out_file, rrdnew.pdp_prep,
178 sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt);
179 rrd_write(rrd_out_file, rrdnew.cdp_prep,
180 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
181 rrdnew.stat_head->rra_cnt);
182 rrd_write(rrd_out_file, rrdnew.rra_ptr,
183 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
185 /* Move the CDPs from the old to the new database.
186 ** This can be made (much) faster but isn't worth the effort. Clarity
187 ** is much more important.
190 /* Move data in unmodified RRAs
193 for (rra = 0; rra < target_rra; rra++) {
194 l += rrdnew.stat_head->ds_cnt * rrdnew.rra_def[rra].row_cnt;
197 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
198 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
201 /* Move data in this RRA, either removing or adding some rows
204 /* Adding extra rows; insert unknown values just after the
205 ** current row number.
207 l = rrdnew.stat_head->ds_cnt *
208 (rrdnew.rra_ptr[target_rra].cur_row + 1);
210 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
211 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
216 l = rrdnew.stat_head->ds_cnt * modify;
218 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
222 /* for the mmap case, we did already fill the whole new file with DNAN
223 * before we copied the old values, so nothing to do here. */
226 /* Removing rows. Normally this would be just after the cursor
227 ** however this may also mean that we wrap to the beginning of
230 signed long int remove_end = 0;
233 (rrdnew.rra_ptr[target_rra].cur_row -
234 modify) % rrdnew.rra_def[target_rra].row_cnt;
236 (signed long int) rrdnew.rra_ptr[target_rra].cur_row) {
237 while (remove_end >= 0) {
239 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
241 rrdnew.rra_ptr[target_rra].cur_row--;
242 rrdnew.rra_def[target_rra].row_cnt--;
246 remove_end = rrdnew.rra_def[target_rra].row_cnt - 1;
248 for (l = 0; l <= rrdnew.rra_ptr[target_rra].cur_row; l++) {
251 for (tmp = 0; tmp < rrdnew.stat_head->ds_cnt; tmp++) {
252 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
253 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
258 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
260 rrdnew.rra_def[target_rra].row_cnt--;
264 /* Move the rest of the CDPs
267 if (rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1) <= 0)
269 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
271 rrdnew.rra_def[target_rra].row_cnt += modify;
272 rrd_seek(rrd_out_file,
273 sizeof(stat_head_t) +
274 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt, SEEK_SET);
275 rrd_write(rrd_out_file, rrdnew.rra_def,
276 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
277 rrd_seek(rrd_out_file, sizeof(live_head_t), SEEK_CUR);
278 rrd_seek(rrd_out_file, sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt,
280 rrd_seek(rrd_out_file,
281 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
282 rrdnew.stat_head->rra_cnt, SEEK_CUR);
283 rrd_write(rrd_out_file, rrdnew.rra_ptr,
284 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
286 rrd_close(rrd_out_file);