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 filesystem = av[0]; 66 if (ac == 1) { 67 perc = 85; 68 } else { 69 perc = strtol(av[1], NULL, 0); 70 if (perc < 50 || perc > 100) 71 rebalance_usage(1); 72 } 73 rebal.saturation = HAMMER_BTREE_INT_ELMS * perc / 100; 74 75 printf("rebalance start %016jx:%04x\n", 76 (uintmax_t)rebal.key_beg.obj_id, 77 rebal.key_beg.localization); 78 79 fd = open(filesystem, O_RDONLY); 80 if (fd < 0) 81 err(1, "Unable to open %s", filesystem); 82 RunningIoctl = 1; 83 if (ioctl(fd, HAMMERIOC_REBALANCE, &rebal) < 0) { 84 printf("Rebalance %s failed: %s\n", 85 filesystem, strerror(errno)); 86 } else if (rebal.head.flags & HAMMER_IOC_HEAD_INTR) { 87 printf("Rebalance %s interrupted by timer at %016jx:%04x\n", 88 filesystem, 89 (uintmax_t)rebal.key_cur.obj_id, 90 rebal.key_cur.localization); 91 if (CyclePath) { 92 hammer_set_cycle(&rebal.key_cur, 0); 93 } 94 } else { 95 if (CyclePath) 96 hammer_reset_cycle(); 97 printf("Rebalance %s succeeded\n", filesystem); 98 } 99 RunningIoctl = 0; 100 close(fd); 101 printf("Rebalance:\n" 102 " %jd B-Tree nodes scanned\n" 103 " %jd B-Tree nodes deleted\n" 104 " %jd collision retries\n" 105 " %jd B-Tree nodes rebalanced\n", 106 (intmax_t)rebal.stat_ncount, 107 (intmax_t)rebal.stat_deletions, 108 (intmax_t)rebal.stat_collisions, 109 (intmax_t)rebal.stat_nrebal 110 ); 111 } 112 113 static 114 void 115 rebalance_usage(int exit_code) 116 { 117 fprintf(stderr, 118 "hammer rebalance <filesystem> [saturation_percentage]\n" 119 "saturation_percentage is 50%%-100%%, default is 85%%.\n"); 120 exit(exit_code); 121 } 122