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 75%) 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 62 if (ac == 0) 63 rebalance_usage(1); 64 filesystem = av[0]; 65 if (ac == 1) { 66 perc = 75; 67 } else { 68 perc = strtol(av[1], NULL, 0); 69 if (perc < 50 || perc > 100) 70 rebalance_usage(1); 71 } 72 printf("rebalance start %016jx:%04x\n", 73 (uintmax_t)rebal.key_beg.obj_id, 74 rebal.key_beg.localization); 75 76 fd = open(filesystem, O_RDONLY); 77 if (fd < 0) 78 err(1, "Unable to open %s", filesystem); 79 RunningIoctl = 1; 80 if (ioctl(fd, HAMMERIOC_REBALANCE, &rebal) < 0) { 81 printf("Rebalance %s failed: %s\n", 82 filesystem, strerror(errno)); 83 } else if (rebal.head.flags & HAMMER_IOC_HEAD_INTR) { 84 printf("Rebalance %s interrupted by timer at %016jx:%04x\n", 85 filesystem, 86 (uintmax_t)rebal.key_cur.obj_id, 87 rebal.key_cur.localization); 88 if (CyclePath) { 89 hammer_set_cycle(&rebal.key_cur, 0); 90 } 91 } else { 92 if (CyclePath) 93 hammer_reset_cycle(); 94 printf("Rebalance %s succeeded\n", filesystem); 95 } 96 RunningIoctl = 0; 97 close(fd); 98 printf("Rebalance:\n" 99 " %jd btree nodes scanned\n" 100 " %jd btree nodes deleted\n" 101 " %jd collision retries\n" 102 " %jd btree nodes rebalanced\n", 103 (intmax_t)rebal.stat_ncount, 104 (intmax_t)rebal.stat_deletions, 105 (intmax_t)rebal.stat_collisions, 106 (intmax_t)rebal.stat_nrebal 107 ); 108 } 109 110 static 111 void 112 rebalance_usage(int exit_code) 113 { 114 fprintf(stderr, 115 "hammer rebalance <filesystem> [saturation_percentage]\n" 116 "saturation_percentage is 50%%-100%%, default is 75%%.\n"); 117 exit(exit_code); 118 } 119