1 /*****************************************************************************
2 * RRDtool 1.2.23 Copyright by Tobi Oetiker, 1997-2007
3 *****************************************************************************
4 * rrd_resize.c Alters size of an RRA
5 *****************************************************************************
6 * Initial version by Alex van den Bogaerdt
7 *****************************************************************************/
15 char *infilename, outfilename[11] = "resize.rrd";
21 unsigned long target_rra;
22 int grow = 0, shrink = 0;
24 rrd_file_t *rrd_file, *rrd_out_file;
27 if (!strcmp(infilename, "resize.rrd")) {
28 rrd_set_error("resize.rrd is a reserved name");
32 rrd_set_error("wrong number of parameters");
36 target_rra = strtol(argv[2], &endptr, 0);
38 if (!strcmp(argv[3], "GROW"))
40 else if (!strcmp(argv[3], "SHRINK"))
43 rrd_set_error("I can only GROW or SHRINK");
47 modify = strtol(argv[4], &endptr, 0);
50 rrd_set_error("Please grow or shrink with at least 1 row");
58 rrd_file = rrd_open(infilename, &rrdold, RRD_READWRITE | RRD_COPY);
59 if (rrd_file == NULL) {
63 if (LockRRD(rrd_file->fd) != 0) {
64 rrd_set_error("could not lock original RRD");
70 if (target_rra >= rrdold.stat_head->rra_cnt) {
71 rrd_set_error("no such RRA in this RRD");
78 if ((long) rrdold.rra_def[target_rra].row_cnt <= -modify) {
79 rrd_set_error("This RRA is not that big");
85 rrd_out_file = rrd_open(outfilename, &rrdnew, RRD_READWRITE | RRD_CREAT);
86 if (rrd_out_file == NULL) {
87 rrd_set_error("Can't create '%s': %s", outfilename,
92 if (LockRRD(rrd_out_file->fd) != 0) {
93 rrd_set_error("could not lock new RRD");
96 rrd_close(rrd_out_file);
99 /*XXX: do one write for those parts of header that are unchanged */
100 rrdnew.stat_head = rrdold.stat_head;
101 rrdnew.ds_def = rrdold.ds_def;
102 rrdnew.rra_def = rrdold.rra_def;
103 rrdnew.live_head = rrdold.live_head;
104 rrdnew.pdp_prep = rrdold.pdp_prep;
105 rrdnew.cdp_prep = rrdold.cdp_prep;
106 rrdnew.rra_ptr = rrdold.rra_ptr;
108 version = atoi(rrdold.stat_head->version);
113 rrdold.stat_head->version[3] = '3';
116 rrd_set_error("Do not know how to handle RRD version %s",
117 rrdold.stat_head->version);
124 /* XXX: Error checking? */
125 rrd_write(rrd_out_file, rrdnew.stat_head, sizeof(stat_head_t) * 1);
126 rrd_write(rrd_out_file, rrdnew.ds_def,
127 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt);
128 rrd_write(rrd_out_file, rrdnew.rra_def,
129 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
130 rrd_write(rrd_out_file, rrdnew.live_head, sizeof(live_head_t) * 1);
131 rrd_write(rrd_out_file, rrdnew.pdp_prep,
132 sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt);
133 rrd_write(rrd_out_file, rrdnew.cdp_prep,
134 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
135 rrdnew.stat_head->rra_cnt);
136 rrd_write(rrd_out_file, rrdnew.rra_ptr,
137 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
139 /* Move the CDPs from the old to the new database.
140 ** This can be made (much) faster but isn't worth the effort. Clarity
141 ** is much more important.
144 /* Move data in unmodified RRAs
147 for (rra = 0; rra < target_rra; rra++) {
148 l += rrdnew.stat_head->ds_cnt * rrdnew.rra_def[rra].row_cnt;
151 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
152 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
155 /* Move data in this RRA, either removing or adding some rows
158 /* Adding extra rows; insert unknown values just after the
159 ** current row number.
161 l = rrdnew.stat_head->ds_cnt * (rrdnew.rra_ptr[target_rra].cur_row +
164 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
165 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
169 l = rrdnew.stat_head->ds_cnt * modify;
171 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
175 /* Removing rows. Normally this would be just after the cursor
176 ** however this may also mean that we wrap to the beginning of
179 signed long int remove_end = 0;
182 (rrdnew.rra_ptr[target_rra].cur_row -
183 modify) % rrdnew.rra_def[target_rra].row_cnt;
185 (signed long int) rrdnew.rra_ptr[target_rra].cur_row) {
186 while (remove_end >= 0) {
188 sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
190 rrdnew.rra_ptr[target_rra].cur_row--;
191 rrdnew.rra_def[target_rra].row_cnt--;
195 remove_end = rrdnew.rra_def[target_rra].row_cnt - 1;
197 for (l = 0; l <= rrdnew.rra_ptr[target_rra].cur_row; l++) {
200 for (tmp = 0; tmp < rrdnew.stat_head->ds_cnt; tmp++) {
201 rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
202 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
206 rrd_seek(rrd_file, sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
208 rrdnew.rra_def[target_rra].row_cnt--;
212 /* Move the rest of the CDPs
215 if (rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1) <= 0)
217 rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
219 rrdnew.rra_def[target_rra].row_cnt += modify;
220 rrd_seek(rrd_out_file,
221 sizeof(stat_head_t) +
222 sizeof(ds_def_t) * rrdnew.stat_head->ds_cnt, SEEK_SET);
223 rrd_write(rrd_out_file, rrdnew.rra_def,
224 sizeof(rra_def_t) * rrdnew.stat_head->rra_cnt);
225 rrd_seek(rrd_out_file, sizeof(live_head_t), SEEK_CUR);
226 rrd_seek(rrd_out_file, sizeof(pdp_prep_t) * rrdnew.stat_head->ds_cnt,
228 rrd_seek(rrd_out_file,
229 sizeof(cdp_prep_t) * rrdnew.stat_head->ds_cnt *
230 rrdnew.stat_head->rra_cnt, SEEK_CUR);
231 rrd_write(rrd_out_file, rrdnew.rra_ptr,
232 sizeof(rra_ptr_t) * rrdnew.stat_head->rra_cnt);
238 rrd_close(rrd_out_file);