1 /* 2 * Copyright (c) 2011 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Antonio Huete <tuxillo@quantumachine.net> 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 <dirent.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #include <unistd.h> 45 46 #include "libhammer.h" 47 48 static u_int32_t count_snapshots(u_int32_t, char *, char *, int *); 49 50 libhammer_volinfo_t 51 libhammer_get_volinfo(const char *path) 52 { 53 struct hammer_ioc_pseudofs_rw pseudofs; 54 struct hammer_pseudofs_data *pfs_od; 55 struct hammer_ioc_info info; 56 libhammer_pfsinfo_t pfstmp; 57 libhammer_volinfo_t hvi; 58 int pfs_id; 59 int fd; 60 61 if ((fd = open(path, O_RDONLY)) < 0) 62 return NULL; 63 64 hvi = _libhammer_malloc(sizeof(*hvi)); 65 TAILQ_INIT(&hvi->list_pseudo); 66 if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0) { 67 libhammer_free_volinfo(hvi); 68 close(fd); 69 return NULL; 70 } 71 72 /* Fill volume information */ 73 snprintf(hvi->vol_name, TXTLEN, "%s", info.vol_name); 74 hvi->vol_fsid = info.vol_fsid; 75 hvi->version = info.version; 76 hvi->nvolumes = info.nvolumes; 77 hvi->inodes = info.inodes; 78 hvi->bigblocks = info.bigblocks; 79 hvi->freebigblocks = info.freebigblocks; 80 hvi->rsvbigblocks = info.rsvbigblocks; 81 82 pfs_od = _libhammer_malloc(sizeof(*pfs_od)); 83 84 /* 85 * XXX - Iterate HAMMER_MAX_PFS (65536) PFS ids and rely on the ioctl(2) 86 * return code to determine whether the PFS actually exists or not. 87 * This is suboptimal. The correct way would be to extract the pseudofs 88 * information from the control records in the B-Tree, that's in kernel 89 * land. 90 */ 91 for(pfs_id = 0; pfs_id < HAMMER_MAX_PFS; pfs_id++) { 92 bzero(&pseudofs, sizeof(pseudofs)); 93 bzero(pfs_od, sizeof(*pfs_od)); 94 95 pseudofs.pfs_id = pfs_id; 96 pseudofs.ondisk = pfs_od; 97 pseudofs.bytes = sizeof(struct hammer_pseudofs_data); 98 pseudofs.version = HAMMER_IOC_PSEUDOFS_VERSION; 99 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pseudofs) != -1) { 100 /* 101 * XXX - In the case the path passed is on PFS#0 but it 102 * is not the mountpoint itself, it could produce a 103 * wrong type of PFS. 104 */ 105 pfstmp = _libhammer_malloc(sizeof(*pfstmp)); 106 pfstmp->ismaster = 107 (pfs_od->mirror_flags & HAMMER_PFSD_SLAVE) ? 0 : 1; 108 109 if (pfs_id == 0) 110 pfstmp->mountedon = strdup(path); 111 else 112 pfstmp->mountedon = 113 libhammer_find_pfs_mount(pfs_id, 114 hvi->vol_fsid, pfstmp->ismaster); 115 /* 116 * Fill in structs used in the library. We don't rely on 117 * HAMMER own struct but we do fill our own. 118 */ 119 pfstmp->version = pseudofs.version; 120 pfstmp->pfs_id = pseudofs.pfs_id; 121 pfstmp->mirror_flags = pfs_od->mirror_flags; 122 pfstmp->snapcount = count_snapshots(hvi->version, 123 pfstmp->snapshots, pfstmp->mountedon, 124 &pfstmp->head.error); 125 126 TAILQ_INSERT_TAIL(&hvi->list_pseudo, pfstmp, entries); 127 } 128 } 129 free(pfs_od); 130 close (fd); 131 132 return (hvi); 133 } 134 135 void 136 libhammer_free_volinfo(libhammer_volinfo_t volinfo) 137 { 138 struct libhammer_pfsinfo *pfstmp; 139 140 while(!TAILQ_EMPTY(&volinfo->list_pseudo)) { 141 pfstmp = TAILQ_FIRST(&volinfo->list_pseudo); 142 free(pfstmp->mountedon); 143 TAILQ_REMOVE(&volinfo->list_pseudo, pfstmp, entries); 144 free(pfstmp); 145 } 146 free(volinfo); 147 } 148 149 static u_int32_t 150 count_snapshots(u_int32_t version, char *pfs_snapshots, char *mountedon, 151 int *errorp) 152 { 153 struct hammer_ioc_snapshot snapinfo; 154 char *snapshots_path, *fpath; 155 struct dirent *den; 156 struct stat st; 157 DIR *dir; 158 u_int32_t snapshot_count; 159 int fd; 160 161 snapshot_count = 0; 162 163 bzero(&snapinfo, sizeof(struct hammer_ioc_snapshot)); 164 165 fd = open(mountedon, O_RDONLY); 166 if (fd < 0) { 167 *errorp = errno; 168 return 0; 169 } 170 171 if (version < 3) { 172 /* 173 * old style: count the number of softlinks in the snapshots dir 174 */ 175 if (pfs_snapshots[0]) 176 snapshots_path = pfs_snapshots; 177 else 178 asprintf(&snapshots_path, "%s/snapshots", mountedon); 179 if ((dir = opendir(snapshots_path)) != NULL) { 180 while ((den = readdir(dir)) != NULL) { 181 if (den->d_name[0] == '.') 182 continue; 183 asprintf(&fpath, "%s/%s", snapshots_path, 184 den->d_name); 185 if (lstat(fpath, &st) == 0 && 186 S_ISLNK(st.st_mode)) 187 snapshot_count++; 188 free(fpath); 189 } 190 closedir(dir); 191 } 192 } else { 193 /* 194 * new style: file system meta-data 195 */ 196 do { 197 if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapinfo) < 0) { 198 *errorp = errno; 199 goto out; 200 } 201 202 snapshot_count += snapinfo.count; 203 } while (snapinfo.head.error == 0 && snapinfo.count); 204 } 205 206 out: 207 if (!pfs_snapshots[0]) 208 free(snapshots_path); 209 if (fd != -1) 210 close(fd); 211 return snapshot_count; 212 } 213