1 /*****************************************************************************
2 * RRDtool 1.3.9 Copyright by Tobi Oetiker, 1997-2009
3 *****************************************************************************
4 * rrd_resize.c Alters size of an RRA
5 *****************************************************************************
6 * Initial version by Alex van den Bogaerdt
7 *****************************************************************************/
9 #include "rrd_tool.h"
11 #ifdef WIN32
12 #include <stdlib.h>
13 #endif
15 int rrd_resize(
16 int argc,
17 char **argv)
18 {
19 char *infilename, outfilename[11] = "resize.rrd";
20 rrd_t rrdold, rrdnew;
21 rrd_value_t buffer;
22 int version;
23 unsigned long l, rra;
24 long modify;
25 unsigned long target_rra;
26 int grow = 0, shrink = 0;
27 char *endptr;
28 rrd_file_t *rrd_file, *rrd_out_file;
30 infilename = argv[1];
31 if (!strcmp(infilename, "resize.rrd")) {
32 rrd_set_error("resize.rrd is a reserved name");
33 return (-1);
34 }
35 if (argc != 5) {
36 rrd_set_error("wrong number of parameters");
37 return (-1);
38 }
40 target_rra = strtol(argv[2], &endptr, 0);
42 if (!strcmp(argv[3], "GROW"))
43 grow = 1;
44 else if (!strcmp(argv[3], "SHRINK"))
45 shrink = 1;
46 else {
47 rrd_set_error("I can only GROW or SHRINK");
48 return (-1);
49 }
51 modify = strtol(argv[4], &endptr, 0);
53 if ((modify < 1)) {
54 rrd_set_error("Please grow or shrink with at least 1 row");
55 return (-1);
56 }
58 if (shrink)
59 modify = -modify;
62 rrd_file = rrd_open(infilename, &rrdold, RRD_READWRITE | RRD_COPY);
63 if (rrd_file == NULL) {
64 rrd_free(&rrdold);
65 return (-1);
66 }
68 if (rrd_lock(rrd_file) != 0) {
69 rrd_set_error("could not lock original RRD");
70 rrd_free(&rrdold);
71 rrd_close(rrd_file);
72 return (-1);
73 }
76 if (target_rra >= rrdold.stat_head->rra_cnt) {
77 rrd_set_error("no such RRA in this RRD");
78 rrd_free(&rrdold);
79 rrd_close(rrd_file);
80 return (-1);
81 }
83 if (modify < 0)
84 if ((long) rrdold.rra_def[target_rra].row_cnt <= -modify) {
85 rrd_set_error("This RRA is not that big");
86 rrd_free(&rrdold);
87 rrd_close(rrd_file);
88 return (-1);
89 }
90 /* the size of the new file */
91 /* yes we are abusing the float cookie for this, aargh */
92 if ((rrdnew.stat_head = (stat_head_t*)calloc(1, sizeof(stat_head_t))) == NULL) {
93 rrd_set_error("allocating stat_head for new RRD");
94 rrd_free(&rrdold);
95 rrd_close(rrd_file);
96 return (-1);
97 }
98 rrdnew.stat_head->float_cookie = rrd_file->file_len +
99 (rrdold.stat_head->ds_cnt * sizeof(rrd_value_t) * modify);
100 rrd_out_file = rrd_open(outfilename, &rrdnew, RRD_READWRITE | RRD_CREAT);
101 if (rrd_out_file == NULL) {
102 rrd_set_error("Can't create '%s': %s", outfilename,
103 rrd_strerror(errno));
104 rrd_free(&rrdnew);
105 rrd_free(&rrdold);
106 rrd_close(rrd_file);
107 return (-1);
108 }
109 if (rrd_lock(rrd_out_file) != 0) {
110 rrd_set_error("could not lock new RRD");
111 rrd_free(&rrdnew);
112 rrd_free(&rrdold);
113 rrd_close(rrd_file);
114 rrd_close(rrd_out_file);
115 return (-1);
116 }
117 /*XXX: do one write for those parts of header that are unchanged */
118 if ((rrdnew.stat_head = (stat_head_t*)malloc(sizeof(stat_head_t))) == NULL) {
119 rrd_set_error("allocating stat_head for new RRD");
120 rrd_free(&rrdnew);
121 rrd_free(&rrdold);
122 rrd_close(rrd_file);
123 rrd_close(rrd_out_file);
124 return (-1);
125 }
127 if ((rrdnew.rra_ptr = (rra_ptr_t*)malloc(sizeof(rra_ptr_t) * rrdold.stat_head->rra_cnt)) == NULL) {
128 rrd_set_error("allocating rra_ptr for new RRD");
129 rrd_free(&rrdnew);
130 rrd_free(&rrdold);
131 rrd_close(rrd_file);
132 rrd_close(rrd_out_file);
133 return (-1);
134 }
136 if ((rrdnew.rra_def = (rra_def_t*)malloc(sizeof(rra_def_t) * rrdold.stat_head->rra_cnt)) == NULL) {
137 rrd_set_error("allocating rra_def for new RRD");
138 rrd_free(&rrdnew);
139 rrd_free(&rrdold);
140 rrd_close(rrd_file);
141 rrd_close(rrd_out_file);
142 return (-1);
143 }
145 memcpy(rrdnew.stat_head,rrdold.stat_head,sizeof(stat_head_t));
146 rrdnew.ds_def = rrdold.ds_def;
148 /* we are going to free rrdold later on, so make sure its not still pointing to the new stuff */
149 rrdold.live_head = NULL;
150 memcpy(rrdnew.rra_def,rrdold.rra_def,sizeof(rra_def_t) * rrdold.stat_head->rra_cnt);
151 rrdnew.live_head = rrdold.live_head;
152 rrdold.live_head = NULL;
153 rrdnew.pdp_prep = rrdold.pdp_prep;
154 rrdold.pdp_prep = NULL;
155 rrdnew.cdp_prep = rrdold.cdp_prep;
156 rrdold.cdp_prep = NULL;
157 memcpy(rrdnew.rra_ptr,rrdold.rra_ptr,sizeof(rra_ptr_t) * rrdold.stat_head->rra_cnt);
159 version = atoi(rrdold.stat_head->version);
160 switch (version) {
161 case 4:
162 break;
163 case 3:
164 break;
165 case 1:
166 rrdnew.stat_head->version[3] = '3';
167 break;
168 default:
169 rrd_set_error("Do not know how to handle RRD version %s",
170 rrdold.stat_head->version);
171 rrd_free(&rrdnew);
172 rrd_free(&rrdold);
173 rrd_close(rrd_file);
174 rrd_close(rrd_out_file);
175 return (-1);
176 break;
177 }
179 /* XXX: Error checking? */
180 rrd_write(rrd_out_file, rrdnew.stat_head, sizeof(stat_head_t) * 1);
181 rrd_write(rrd_out_file, rrdnew.ds_def,
182 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt);
183 rrd_write(rrd_out_file, rrdnew.rra_def,
184 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
185 rrd_write(rrd_out_file, rrdnew.live_head, sizeof(live_head_t) * 1);
186 rrd_write(rrd_out_file, rrdnew.pdp_prep,
187 sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt);
188 rrd_write(rrd_out_file, rrdnew.cdp_prep,
189 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
190 rrdnew.stat_head->rra_cnt);
191 rrd_write(rrd_out_file, rrdnew.rra_ptr,
192 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
194 /* Move the CDPs from the old to the new database.
195 ** This can be made (much) faster but isn't worth the effort. Clarity
196 ** is much more important.
197 */
199 /* Move data in unmodified RRAs
200 */
201 l = 0;
202 for (rra = 0; rra < target_rra; rra++) {
203 l += rrdnew.stat_head->ds_cnt * rrdnew.rra_def[rra].row_cnt;
204 }
205 while (l > 0) {
206 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
207 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
208 l--;
209 }
210 /* Move data in this RRA, either removing or adding some rows
211 */
212 if (modify > 0) {
213 /* Adding extra rows; insert unknown values just after the
214 ** current row number.
215 */
216 l = rrdnew.stat_head->ds_cnt *
217 (rrdnew.rra_ptr[target_rra].cur_row + 1);
218 while (l > 0) {
219 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
220 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
221 l--;
222 }
223 buffer = DNAN;
224 l = rrdnew.stat_head->ds_cnt * modify;
225 while (l > 0) {
226 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
227 l--;
228 }
229 } else {
230 /* Removing rows. Normally this would be just after the cursor
231 ** however this may also mean that we wrap to the beginning of
232 ** the array.
233 */
234 signed long int remove_end = 0;
236 remove_end =
237 (rrdnew.rra_ptr[target_rra].cur_row -
238 modify) % rrdnew.rra_def[target_rra].row_cnt;
239 if (remove_end <=
240 (signed long int) rrdnew.rra_ptr[target_rra].cur_row) {
241 while (remove_end >= 0) {
242 rrd_seek(rrd_file,
243 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
244 SEEK_CUR);
245 rrdnew.rra_ptr[target_rra].cur_row--;
246 rrdnew.rra_def[target_rra].row_cnt--;
247 remove_end--;
248 modify++;
249 }
250 remove_end = rrdnew.rra_def[target_rra].row_cnt - 1;
251 }
252 for (l = 0; l <= rrdnew.rra_ptr[target_rra].cur_row; l++) {
253 unsigned int tmp;
255 for (tmp = 0; tmp < rrdnew.stat_head->ds_cnt; tmp++) {
256 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
257 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
258 }
259 }
260 while (modify < 0) {
261 rrd_seek(rrd_file,
262 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
263 SEEK_CUR);
264 rrdnew.rra_def[target_rra].row_cnt--;
265 modify++;
266 }
267 }
268 /* Move the rest of the CDPs
269 */
270 while (1) {
271 if (rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1) <= 0)
272 break;
273 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
274 }
275 rrdnew.rra_def[target_rra].row_cnt += modify;
276 rrd_seek(rrd_out_file,
277 sizeof(stat_head_t) +
278 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt, SEEK_SET);
279 rrd_write(rrd_out_file, rrdnew.rra_def,
280 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
281 rrd_seek(rrd_out_file, sizeof(live_head_t), SEEK_CUR);
282 rrd_seek(rrd_out_file, sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt,
283 SEEK_CUR);
284 rrd_seek(rrd_out_file,
285 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
286 rrdnew.stat_head->rra_cnt, SEEK_CUR);
287 rrd_write(rrd_out_file, rrdnew.rra_ptr,
288 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
289 rrd_close(rrd_file);
290 rrd_close(rrd_out_file);
291 rrd_free(&rrdold);
292 rrd_free(&rrdnew);
293 return (0);
294 }