2 * Copyright (c) 2011 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Antonio Huete <tuxillo@quantumachine.net>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
42 #include <sys/param.h>
46 #include "libhammer.h"
48 static u_int32_t count_snapshots(u_int32_t, char *, char *, int *);
51 libhammer_get_volinfo(const char *path)
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;
61 if ((fd = open(path, O_RDONLY)) < 0)
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);
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;
82 pfs_od = _libhammer_malloc(sizeof(*pfs_od));
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
91 for(pfs_id = 0; pfs_id < HAMMER_MAX_PFS; pfs_id++) {
92 bzero(&pseudofs, sizeof(pseudofs));
93 bzero(pfs_od, sizeof(*pfs_od));
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) {
101 * XXX - In the case the path passed is on PFS#0 but it
102 * is not the mountpoint itself, it could produce a
105 pfstmp = _libhammer_malloc(sizeof(*pfstmp));
107 (pfs_od->mirror_flags & HAMMER_PFSD_SLAVE) ? 0 : 1;
110 pfstmp->mountedon = strdup(path);
113 libhammer_find_pfs_mount(pfs_id,
114 hvi->vol_fsid, pfstmp->ismaster);
116 * Fill in structs used in the library. We don't rely on
117 * HAMMER own struct but we do fill our own.
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);
126 TAILQ_INSERT_TAIL(&hvi->list_pseudo, pfstmp, entries);
136 libhammer_free_volinfo(libhammer_volinfo_t volinfo)
138 struct libhammer_pfsinfo *pfstmp;
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);
150 count_snapshots(u_int32_t version, char *pfs_snapshots, char *mountedon,
153 struct hammer_ioc_snapshot snapinfo;
154 char *snapshots_path, *fpath;
158 u_int32_t snapshot_count;
163 bzero(&snapinfo, sizeof(struct hammer_ioc_snapshot));
165 fd = open(mountedon, O_RDONLY);
173 * old style: count the number of softlinks in the snapshots dir
175 if (pfs_snapshots[0])
176 snapshots_path = pfs_snapshots;
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] == '.')
183 asprintf(&fpath, "%s/%s", snapshots_path,
185 if (lstat(fpath, &st) == 0 &&
194 * new style: file system meta-data
197 if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapinfo) < 0) {
202 snapshot_count += snapinfo.count;
203 } while (snapinfo.head.error == 0 && snapinfo.count);
207 if (!pfs_snapshots[0])
208 free(snapshots_path);
211 return snapshot_count;