From 6e2ec26b9eb246b0a2b28f91c3f1595f51611f4a Mon Sep 17 00:00:00 2001 From: oetiker Date: Sat, 6 Sep 2008 10:39:29 +0000 Subject: [PATCH] fix for multi update - data corruption bug as reported (and patched) in #178 by kevin brintnall git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1480 a5681a0c-68f1-0310-ab6d-d61299d08faa --- src/rrd_update.c | 119 ++++++++++++++++++----------------------------- 1 file changed, 46 insertions(+), 73 deletions(-) diff --git a/src/rrd_update.c b/src/rrd_update.c index dc2a675..8fe1395 100644 --- a/src/rrd_update.c +++ b/src/rrd_update.c @@ -780,12 +780,10 @@ static int process_arg( } /* seek to the beginning of the rra's */ if (*rra_current != rra_begin) { -#ifndef HAVE_MMAP if (rrd_seek(rrd_file, rra_begin, SEEK_SET) != 0) { rrd_set_error("seek error in rrd"); return -1; } -#endif *rra_current = rra_begin; } rra_start = rra_begin; @@ -1868,95 +1866,70 @@ static int write_to_rras( { unsigned long rra_idx; unsigned long rra_start; - unsigned long rra_pos_tmp; /* temporary byte pointer. */ time_t rra_time = 0; /* time of update for a RRA */ + unsigned long ds_cnt = rrd->stat_head->ds_cnt; + /* Ready to write to disk */ rra_start = rra_begin; + for (rra_idx = 0; rra_idx < rrd->stat_head->rra_cnt; rra_idx++) { - /* skip unless there's something to write */ - if (rra_step_cnt[rra_idx]) { - /* write the first row */ + rra_def_t *rra_def = &rrd->rra_def[rra_idx]; + rra_ptr_t *rra_ptr = &rrd->rra_ptr[rra_idx]; + + /* for cdp_prep */ + unsigned short scratch_idx; + unsigned long step_subtract; + + for (scratch_idx = CDP_primary_val, + step_subtract = 1; + rra_step_cnt[rra_idx] > 0; + rra_step_cnt[rra_idx]--, + scratch_idx = CDP_secondary_val, + step_subtract = 2) { + + unsigned long rra_pos_new; #ifdef DEBUG fprintf(stderr, " -- RRA Preseek %ld\n", rrd_file->pos); #endif - rrd->rra_ptr[rra_idx].cur_row++; - if (rrd->rra_ptr[rra_idx].cur_row >= - rrd->rra_def[rra_idx].row_cnt) - rrd->rra_ptr[rra_idx].cur_row = 0; /* wrap around */ - /* position on the first row */ - rra_pos_tmp = rra_start + - (rrd->stat_head->ds_cnt) * (rrd->rra_ptr[rra_idx].cur_row) * - sizeof(rrd_value_t); - if (rra_pos_tmp != *rra_current) { - if (rrd_seek(rrd_file, rra_pos_tmp, SEEK_SET) != 0) { + /* increment, with wrap-around */ + if (++rra_ptr->cur_row >= rra_def->row_cnt) + rra_ptr->cur_row = 0; + + /* we know what our position should be */ + rra_pos_new = rra_start + + ds_cnt * rra_ptr->cur_row * sizeof(rrd_value_t); + + /* re-seek if the position is wrong or we wrapped around */ + if (rra_pos_new != *rra_current || rra_ptr->cur_row == 0) { + if (rrd_seek(rrd_file, rra_pos_new, SEEK_SET) != 0) { rrd_set_error("seek error in rrd"); return -1; } - *rra_current = rra_pos_tmp; + *rra_current = rra_pos_new; } #ifdef DEBUG fprintf(stderr, " -- RRA Postseek %ld\n", rrd_file->pos); #endif - if (!skip_update[rra_idx]) { - if (*pcdp_summary != NULL) { - rra_time = (current_time - current_time - % (rrd->rra_def[rra_idx].pdp_cnt * - rrd->stat_head->pdp_step)) - - - ((rra_step_cnt[rra_idx] - - 1) * rrd->rra_def[rra_idx].pdp_cnt * - rrd->stat_head->pdp_step); - } - if (write_RRA_row - (rrd_file, rrd, rra_idx, rra_current, CDP_primary_val, - pcdp_summary, rra_time) == -1) - return -1; - } - /* write other rows of the bulk update, if any */ - for (; rra_step_cnt[rra_idx] > 1; rra_step_cnt[rra_idx]--) { - if (++rrd->rra_ptr[rra_idx].cur_row == - rrd->rra_def[rra_idx].row_cnt) { -#ifdef DEBUG - fprintf(stderr, - "Wraparound for RRA %s, %lu updates left\n", - rrd->rra_def[rra_idx].cf_nam, - rra_step_cnt[rra_idx] - 1); -#endif - /* wrap */ - rrd->rra_ptr[rra_idx].cur_row = 0; - /* seek back to beginning of current rra */ - if (rrd_seek(rrd_file, rra_start, SEEK_SET) != 0) { - rrd_set_error("seek error in rrd"); - return -1; - } -#ifdef DEBUG - fprintf(stderr, " -- Wraparound Postseek %ld\n", - rrd_file->pos); -#endif - *rra_current = rra_start; - } - if (!skip_update[rra_idx]) { - if (*pcdp_summary != NULL) { - rra_time = (current_time - current_time - % (rrd->rra_def[rra_idx].pdp_cnt * - rrd->stat_head->pdp_step)) - - - ((rra_step_cnt[rra_idx] - - 2) * rrd->rra_def[rra_idx].pdp_cnt * - rrd->stat_head->pdp_step); - } - if (write_RRA_row(rrd_file, rrd, rra_idx, rra_current, - CDP_secondary_val, pcdp_summary, - rra_time) == -1) - return -1; - } + if (skip_update[rra_idx]) + continue; + + if (*pcdp_summary != NULL) { + unsigned long step_time = rra_def->pdp_cnt * rrd->stat_head->pdp_step; + + rra_time = (current_time - current_time % step_time) + - ((rra_step_cnt[rra_idx] - step_subtract) * step_time); } + + if (write_RRA_row + (rrd_file, rrd, rra_idx, rra_current, scratch_idx, + pcdp_summary, rra_time) == -1) + return -1; } - rra_start += rrd->rra_def[rra_idx].row_cnt * rrd->stat_head->ds_cnt * - sizeof(rrd_value_t); - } /* RRA LOOP */ + + rra_start += rra_def->row_cnt * ds_cnt * sizeof(rrd_value_t); + } /* RRA LOOP */ return 0; } -- 2.30.2