libhammer - Add an overlooked function that releases snaps
[dragonfly.git] / lib / libhammer / info.c
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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 */
c8fec8af 34
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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
3729b417 46#include "libhammer.h"
cb7575e6 47
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48libhammer_fsinfo_t
49libhammer_get_fsinfo(const char *path)
cb7575e6 50{
cb7575e6 51 struct hammer_pseudofs_data *pfs_od;
431893ca 52 struct hammer_ioc_pfs_iterate pi;
cb7575e6 53 struct hammer_ioc_info info;
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54 libhammer_pfsinfo_t pip;
55 libhammer_fsinfo_t fip;
431893ca 56 int error = 0;
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57 int fd;
58
cb7575e6 59 if ((fd = open(path, O_RDONLY)) < 0)
c8fec8af 60 return NULL;
cb7575e6 61
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62 fip = _libhammer_malloc(sizeof(*fip));
63 TAILQ_INIT(&fip->list_pseudo);
c8fec8af 64 if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0) {
a77d0377 65 libhammer_free_fsinfo(fip);
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66 close(fd);
67 return NULL;
68 }
cb7575e6 69
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70 /* Fill filesystem information */
71 snprintf(fip->vol_name, TXTLEN, "%s", info.vol_name);
72 fip->vol_fsid = info.vol_fsid;
73 fip->version = info.version;
74 fip->nvolumes = info.nvolumes;
75 fip->inodes = info.inodes;
76 fip->bigblocks = info.bigblocks;
77 fip->freebigblocks = info.freebigblocks;
78 fip->rsvbigblocks = info.rsvbigblocks;
cb7575e6 79
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80 bzero(&pi, sizeof(pi));
81 pi.ondisk = _libhammer_malloc(sizeof(*pfs_od));
82 while(error == 0) {
83 error = ioctl(fd, HAMMERIOC_PFS_ITERATE, &pi);
84 if (error == 0 &&
85 ((pi.head.flags & HAMMER_PFSD_DELETED) == 0)) {
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86
87 pip = _libhammer_malloc(sizeof(*pip));
431893ca 88 pfs_od = pi.ondisk;
a77d0377 89 pip->ismaster =
c8fec8af 90 (pfs_od->mirror_flags & HAMMER_PFSD_SLAVE) ? 0 : 1;
cb7575e6 91
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92 /*
93 * Fill in structs used in the library. We don't rely on
a77d0377 94 * HAMMER structs but we do fill our own.
cb7575e6 95 */
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96 pip->version = fip->version;
97 pip->pfs_id = pi.pos;
98 pip->mirror_flags = pfs_od->mirror_flags;
99 pip->beg_tid = pfs_od->sync_beg_tid;
100 pip->end_tid = pfs_od->sync_end_tid;
101 pip->mountedon =
d428efb7 102 libhammer_find_pfs_mount(&pfs_od->unique_uuid);
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103 if (fip->version < 3) {
104 libhammer_compat_old_snapcount(pip);
105 } else {
106 TAILQ_INIT(&pip->list_snap);
107 if (libhammer_pfs_get_snapshots(fip, pip) < 0)
108 pip->snapcount = 0;
109 }
110
111 /*
112 * PFS retrieval goes 0..n so inserting in the tail
113 * leaves the TAILQ sorted by pfs_id.
114 * This is important since quickly getting PFS #0 is
115 * required for some functions so *DO NOT CHANGE IT*.
116 */
117 TAILQ_INSERT_TAIL(&fip->list_pseudo, pip, entries);
cb7575e6 118
cb7575e6 119 }
431893ca 120 pi.pos++;
cb7575e6 121 }
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122 free(pi.ondisk);
123
c8fec8af 124 close (fd);
cb7575e6 125
a77d0377 126 return (fip);
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127}
128
129void
a77d0377 130libhammer_free_fsinfo(libhammer_fsinfo_t fip)
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131{
132 struct libhammer_pfsinfo *pfstmp;
133
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134 while(!TAILQ_EMPTY(&fip->list_pseudo)) {
135 pfstmp = TAILQ_FIRST(&fip->list_pseudo);
cc96d2fe 136 libhammer_pfs_free_snapshots(pfstmp);
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137 if (pfstmp->mountedon)
138 free(pfstmp->mountedon);
139 TAILQ_REMOVE(&fip->list_pseudo, pfstmp, entries);
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140 free(pfstmp);
141 }
a77d0377 142 free(fip);
cb7575e6 143}