2049982aa46bd1b0d1fb2d4aa3db3b46bd59c55e
1 /*****************************************************************************
2 * RRDtool 1.3.8 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 rrd_close(rrd_out_file);
108 return (-1);
109 }
110 if (rrd_lock(rrd_out_file) != 0) {
111 rrd_set_error("could not lock new RRD");
112 rrd_free(&rrdnew);
113 rrd_free(&rrdold);
114 rrd_close(rrd_file);
115 rrd_close(rrd_out_file);
116 return (-1);
117 }
118 /*XXX: do one write for those parts of header that are unchanged */
119 if ((rrdnew.stat_head = (stat_head_t*)malloc(sizeof(stat_head_t))) == NULL) {
120 rrd_set_error("allocating stat_head for new RRD");
121 rrd_free(&rrdnew);
122 rrd_free(&rrdold);
123 rrd_close(rrd_file);
124 rrd_close(rrd_out_file);
125 return (-1);
126 }
128 if ((rrdnew.rra_ptr = (rra_ptr_t*)malloc(sizeof(rra_ptr_t) * rrdold.stat_head->rra_cnt)) == NULL) {
129 rrd_set_error("allocating rra_ptr for new RRD");
130 rrd_free(&rrdnew);
131 rrd_free(&rrdold);
132 rrd_close(rrd_file);
133 rrd_close(rrd_out_file);
134 return (-1);
135 }
137 if ((rrdnew.rra_def = (rra_def_t*)malloc(sizeof(rra_def_t) * rrdold.stat_head->rra_cnt)) == NULL) {
138 rrd_set_error("allocating rra_def for new RRD");
139 rrd_free(&rrdnew);
140 rrd_free(&rrdold);
141 rrd_close(rrd_file);
142 rrd_close(rrd_out_file);
143 return (-1);
144 }
146 memcpy(rrdnew.stat_head,rrdold.stat_head,sizeof(stat_head_t));
147 rrdnew.ds_def = rrdold.ds_def;
149 /* we are going to free rrdold later on, so make sure its not still pointing to the new stuff */
150 rrdold.live_head = NULL;
151 memcpy(rrdnew.rra_def,rrdold.rra_def,sizeof(rra_def_t) * rrdold.stat_head->rra_cnt);
152 rrdnew.live_head = rrdold.live_head;
153 rrdold.live_head = NULL;
154 rrdnew.pdp_prep = rrdold.pdp_prep;
155 rrdold.pdp_prep = NULL;
156 rrdnew.cdp_prep = rrdold.cdp_prep;
157 rrdold.cdp_prep = NULL;
158 memcpy(rrdnew.rra_ptr,rrdold.rra_ptr,sizeof(rra_ptr_t) * rrdold.stat_head->rra_cnt);
160 version = atoi(rrdold.stat_head->version);
161 switch (version) {
162 case 4:
163 break;
164 case 3:
165 break;
166 case 1:
167 rrdnew.stat_head->version[3] = '3';
168 break;
169 default:
170 rrd_set_error("Do not know how to handle RRD version %s",
171 rrdold.stat_head->version);
172 rrd_free(&rrdnew);
173 rrd_free(&rrdold);
174 rrd_close(rrd_file);
175 rrd_close(rrd_out_file);
176 return (-1);
177 break;
178 }
180 /* XXX: Error checking? */
181 rrd_write(rrd_out_file, rrdnew.stat_head, sizeof(stat_head_t) * 1);
182 rrd_write(rrd_out_file, rrdnew.ds_def,
183 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt);
184 rrd_write(rrd_out_file, rrdnew.rra_def,
185 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
186 rrd_write(rrd_out_file, rrdnew.live_head, sizeof(live_head_t) * 1);
187 rrd_write(rrd_out_file, rrdnew.pdp_prep,
188 sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt);
189 rrd_write(rrd_out_file, rrdnew.cdp_prep,
190 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
191 rrdnew.stat_head->rra_cnt);
192 rrd_write(rrd_out_file, rrdnew.rra_ptr,
193 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
195 /* Move the CDPs from the old to the new database.
196 ** This can be made (much) faster but isn't worth the effort. Clarity
197 ** is much more important.
198 */
200 /* Move data in unmodified RRAs
201 */
202 l = 0;
203 for (rra = 0; rra < target_rra; rra++) {
204 l += rrdnew.stat_head->ds_cnt * rrdnew.rra_def[rra].row_cnt;
205 }
206 while (l > 0) {
207 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
208 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
209 l--;
210 }
211 /* Move data in this RRA, either removing or adding some rows
212 */
213 if (modify > 0) {
214 /* Adding extra rows; insert unknown values just after the
215 ** current row number.
216 */
217 l = rrdnew.stat_head->ds_cnt *
218 (rrdnew.rra_ptr[target_rra].cur_row + 1);
219 while (l > 0) {
220 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
221 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
222 l--;
223 }
224 buffer = DNAN;
225 l = rrdnew.stat_head->ds_cnt * modify;
226 while (l > 0) {
227 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
228 l--;
229 }
230 } else {
231 /* Removing rows. Normally this would be just after the cursor
232 ** however this may also mean that we wrap to the beginning of
233 ** the array.
234 */
235 signed long int remove_end = 0;
237 remove_end =
238 (rrdnew.rra_ptr[target_rra].cur_row -
239 modify) % rrdnew.rra_def[target_rra].row_cnt;
240 if (remove_end <=
241 (signed long int) rrdnew.rra_ptr[target_rra].cur_row) {
242 while (remove_end >= 0) {
243 rrd_seek(rrd_file,
244 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
245 SEEK_CUR);
246 rrdnew.rra_ptr[target_rra].cur_row--;
247 rrdnew.rra_def[target_rra].row_cnt--;
248 remove_end--;
249 modify++;
250 }
251 remove_end = rrdnew.rra_def[target_rra].row_cnt - 1;
252 }
253 for (l = 0; l <= rrdnew.rra_ptr[target_rra].cur_row; l++) {
254 unsigned int tmp;
256 for (tmp = 0; tmp < rrdnew.stat_head->ds_cnt; tmp++) {
257 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
258 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
259 }
260 }
261 while (modify < 0) {
262 rrd_seek(rrd_file,
263 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
264 SEEK_CUR);
265 rrdnew.rra_def[target_rra].row_cnt--;
266 modify++;
267 }
268 }
269 /* Move the rest of the CDPs
270 */
271 while (1) {
272 if (rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1) <= 0)
273 break;
274 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
275 }
276 rrdnew.rra_def[target_rra].row_cnt += modify;
277 rrd_seek(rrd_out_file,
278 sizeof(stat_head_t) +
279 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt, SEEK_SET);
280 rrd_write(rrd_out_file, rrdnew.rra_def,
281 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
282 rrd_seek(rrd_out_file, sizeof(live_head_t), SEEK_CUR);
283 rrd_seek(rrd_out_file, sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt,
284 SEEK_CUR);
285 rrd_seek(rrd_out_file,
286 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
287 rrdnew.stat_head->rra_cnt, SEEK_CUR);
288 rrd_write(rrd_out_file, rrdnew.rra_ptr,
289 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
290 rrd_close(rrd_file);
291 rrd_close(rrd_out_file);
292 rrd_free(&rrdold);
293 rrd_free(&rrdnew);
294 return (0);
295 }