Merge branch 'vendor/LIBARCHIVE'
[dragonfly.git] / lib / libhammer / info.c
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 libhammer_fsinfo_t
49 libhammer_get_fsinfo(const char *path)
50 {
51         struct hammer_pseudofs_data *pfs_od;
52         struct hammer_ioc_pfs_iterate pi;
53         struct hammer_ioc_info info;
54         libhammer_pfsinfo_t pip;
55         libhammer_fsinfo_t fip;
56         int error = 0;
57         int fd;
58
59         if ((fd = open(path, O_RDONLY)) < 0)
60                 return NULL;
61
62         fip = _libhammer_malloc(sizeof(*fip));
63         TAILQ_INIT(&fip->list_pseudo);
64         if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0) {
65                 libhammer_free_fsinfo(fip);
66                 close(fd);
67                 return NULL;
68         }
69
70         /* Fill filesystem information */
71         snprintf(fip->vol_name, TXTLEN, "%s", info.vol_label);
72         fip->vol_fsid = info.vol_fsid;
73         fip->version = info.version;
74         fip->nvolumes = info.nvolumes;
75         fip->rootvol = info.rootvol;
76         fip->inodes = info.inodes;
77         fip->bigblocks = info.bigblocks;
78         fip->freebigblocks = info.freebigblocks;
79         fip->rsvbigblocks = info.rsvbigblocks;
80
81         bzero(&pi, sizeof(pi));
82         pi.ondisk = _libhammer_malloc(sizeof(*pfs_od));
83         while(error == 0) {
84                 error = ioctl(fd, HAMMERIOC_PFS_ITERATE, &pi);
85                 if (error == 0 && !hammer_is_pfs_deleted(pi.ondisk)) {
86                         pip = _libhammer_malloc(sizeof(*pip));
87                         pfs_od = pi.ondisk;
88                         pip->ismaster = hammer_is_pfs_master(pfs_od);
89
90                         /*
91                          * Fill in structs used in the library. We don't rely on
92                          * HAMMER structs but we do fill our own.
93                          */
94                         pip->version = fip->version;
95                         pip->pfs_id = pi.pos;
96                         pip->mirror_flags = pfs_od->mirror_flags;
97                         pip->beg_tid = pfs_od->sync_beg_tid;
98                         pip->end_tid = pfs_od->sync_end_tid;
99                         pip->mountedon =
100                             libhammer_find_pfs_mount(&pfs_od->unique_uuid);
101                         if (fip->version < 3) {
102                                 libhammer_compat_old_snapcount(pip);
103                         } else {
104                                 TAILQ_INIT(&pip->list_snap);
105                                 if (libhammer_pfs_get_snapshots(fip, pip) < 0)
106                                         pip->snapcount = 0;
107                         }
108
109                         /*
110                          * PFS retrieval goes 0..n so inserting in the tail
111                          * leaves the TAILQ sorted by pfs_id.
112                          * This is important since quickly getting PFS #0 is
113                          * required for some functions so *DO NOT CHANGE IT*.
114                          */
115                         TAILQ_INSERT_TAIL(&fip->list_pseudo, pip, entries);
116
117                 }
118                 pi.pos++;
119         }
120         free(pi.ondisk);
121
122         close (fd);
123
124         return (fip);
125 }
126
127 void
128 libhammer_free_fsinfo(libhammer_fsinfo_t fip)
129 {
130         struct libhammer_pfsinfo *pfstmp;
131
132         while(!TAILQ_EMPTY(&fip->list_pseudo)) {
133                 pfstmp = TAILQ_FIRST(&fip->list_pseudo);
134                 libhammer_pfs_free_snapshots(pfstmp);
135                 if (pfstmp->mountedon)
136                         free(pfstmp->mountedon);
137                 TAILQ_REMOVE(&fip->list_pseudo, pfstmp, entries);
138                 free(pfstmp);
139         }
140         free(fip);
141 }