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,
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #include <sys/param.h>
45 #include <libhammer.h>
47 static u_int32_t count_snapshots(u_int32_t, char *, char *, int *);
50 libhammer_get_volinfo(const char *path)
52 struct hammer_ioc_pseudofs_rw pseudofs;
53 struct hammer_pseudofs_data *pfs_od;
54 struct hammer_ioc_info info;
55 libhammer_pfsinfo_t pfstmp;
56 libhammer_volinfo_t hvi;
60 hvi = _libhammer_malloc(sizeof(*hvi));
62 TAILQ_INIT(&hvi->list_pseudo);
64 if ((fd = open(path, O_RDONLY)) < 0)
67 if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0)
70 /* Fill volume information */
71 snprintf(hvi->vol_name, TXTLEN, "%s", info.vol_name);
72 hvi->vol_fsid = info.vol_fsid;
73 hvi->version = info.version;
74 hvi->nvolumes = info.nvolumes;
75 hvi->inodes = info.inodes;
76 hvi->bigblocks = info.bigblocks;
77 hvi->freebigblocks = info.freebigblocks;
78 hvi->rsvbigblocks = info.rsvbigblocks;
81 * XXX - By now we iterate the whole range of +65000 possible
82 * pseudofs to discover the ones that are in use. Of course
83 * this is suboptimal. Best way would be to extract the
84 * pseudofs information from the control records in the
85 * B-Tree, that's in kernel land.
87 pfs_od = _libhammer_malloc(sizeof(*pfs_od));
89 for(pfs_id = 0; pfs_id < HAMMER_MAX_PFS; pfs_id++) {
90 /* Clear the struct to be passed to the ioctl. */
91 bzero(&pseudofs, sizeof(pseudofs));
93 pfstmp = _libhammer_malloc(sizeof(*pfstmp));
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 * It may be completely wrong in the case that we pass a path
102 * that is in PFS 0 but isn't the mount path of it. There's no
103 * easy way to do this.
105 pfstmp->ismaster = (pfs_od->mirror_flags & HAMMER_PFSD_SLAVE)
109 pfstmp->mountedon = strdup(path);
111 pfstmp->mountedon = libhammer_find_pfs_mount(pfs_id,
112 hvi->vol_fsid, pfstmp->ismaster);
114 * Fill in structs used in the library. We don't rely on
115 * HAMMER own struct but we do fill our own.
117 pfstmp->version = pseudofs.version;
118 pfstmp->pfs_id = pseudofs.pfs_id;
119 pfstmp->mirror_flags = pfs_od->mirror_flags;
120 pfstmp->snapcount = count_snapshots(hvi->version,
121 pfstmp->snapshots, pfstmp->mountedon, &pfstmp->head.error);
123 TAILQ_INSERT_TAIL(&hvi->list_pseudo, pfstmp, entries);
130 libhammer_free_volinfo(hvi);
139 libhammer_free_volinfo(libhammer_volinfo_t volinfo)
141 struct libhammer_pfsinfo *pfstmp;
143 while(!TAILQ_EMPTY(&volinfo->list_pseudo)) {
144 pfstmp = TAILQ_FIRST(&volinfo->list_pseudo);
145 free(pfstmp->mountedon);
146 TAILQ_REMOVE(&volinfo->list_pseudo, pfstmp, entries);
153 count_snapshots(u_int32_t version, char *pfs_snapshots, char *mountedon, int *errorp)
155 struct hammer_ioc_snapshot snapinfo;
156 char *snapshots_path, *fpath;
160 u_int32_t snapshot_count;
165 bzero(&snapinfo, sizeof(struct hammer_ioc_snapshot));
167 fd = open(mountedon, O_RDONLY);
175 * old style: count the number of softlinks in the snapshots dir
177 if (pfs_snapshots[0])
178 snapshots_path = pfs_snapshots;
180 asprintf(&snapshots_path, "%s/snapshots", mountedon);
181 if ((dir = opendir(snapshots_path)) != NULL) {
182 while ((den = readdir(dir)) != NULL) {
183 if (den->d_name[0] == '.')
185 asprintf(&fpath, "%s/%s", snapshots_path,
187 if (lstat(fpath, &st) == 0 &&
196 * new style: file system meta-data
199 if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapinfo) < 0) {
204 snapshot_count += snapinfo.count;
205 } while (snapinfo.head.error == 0 && snapinfo.count);
211 return snapshot_count;