1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include "hammer.h" 36 37 static void rebalance_usage(int exit_code); 38 39 /* 40 * rebalance <filesystem> [saturation_percentage] (default 85%) 41 */ 42 void 43 hammer_cmd_rebalance(char **av, int ac) 44 { 45 struct hammer_ioc_rebalance rebal; 46 const char *filesystem; 47 int fd; 48 int perc; 49 50 if (TimeoutOpt > 0) 51 alarm(TimeoutOpt); 52 53 bzero(&rebal, sizeof(rebal)); 54 55 rebal.key_beg.localization = HAMMER_MIN_LOCALIZATION; 56 rebal.key_beg.obj_id = HAMMER_MIN_OBJID; 57 hammer_get_cycle(&rebal.key_beg, NULL); 58 59 rebal.key_end.localization = HAMMER_MAX_LOCALIZATION; 60 rebal.key_end.obj_id = HAMMER_MAX_OBJID; 61 rebal.allpfs = AllPFS; 62 63 if (ac == 0) { 64 rebalance_usage(1); 65 /* not reached */ 66 } 67 filesystem = av[0]; 68 if (ac == 1) { 69 perc = 85; 70 } else { 71 perc = strtol(av[1], NULL, 0); 72 if (perc < 50 || perc > 100) { 73 rebalance_usage(1); 74 /* not reached */ 75 } 76 } 77 rebal.saturation = HAMMER_BTREE_INT_ELMS * perc / 100; 78 79 printf("rebalance start %016jx:%04x\n", 80 (uintmax_t)rebal.key_beg.obj_id, 81 rebal.key_beg.localization); 82 83 fd = open(filesystem, O_RDONLY); 84 if (fd < 0) { 85 err(1, "Unable to open %s", filesystem); 86 /* not reached */ 87 } 88 RunningIoctl = 1; 89 if (ioctl(fd, HAMMERIOC_REBALANCE, &rebal) < 0) { 90 printf("Rebalance %s failed: %s\n", 91 filesystem, strerror(errno)); 92 } else if (rebal.head.flags & HAMMER_IOC_HEAD_INTR) { 93 printf("Rebalance %s interrupted by timer at %016jx:%04x\n", 94 filesystem, 95 (uintmax_t)rebal.key_cur.obj_id, 96 rebal.key_cur.localization); 97 if (CyclePath) 98 hammer_set_cycle(&rebal.key_cur, 0); 99 } else { 100 if (CyclePath) 101 hammer_reset_cycle(); 102 printf("Rebalance %s succeeded\n", filesystem); 103 } 104 RunningIoctl = 0; 105 close(fd); 106 printf("Rebalance:\n" 107 " %jd B-Tree nodes scanned\n" 108 " %jd B-Tree nodes deleted\n" 109 " %jd collision retries\n" 110 " %jd B-Tree nodes rebalanced\n", 111 (intmax_t)rebal.stat_ncount, 112 (intmax_t)rebal.stat_deletions, 113 (intmax_t)rebal.stat_collisions, 114 (intmax_t)rebal.stat_nrebal 115 ); 116 } 117 118 static 119 void 120 rebalance_usage(int exit_code) 121 { 122 fprintf(stderr, 123 "hammer rebalance <filesystem> [saturation_percentage]\n" 124 "saturation_percentage is 50%%-100%%, default is 85%%.\n"); 125 exit(exit_code); 126 } 127