quota_open.c revision 1.5 1 /* $NetBSD: quota_open.c,v 1.5 2012/01/25 17:43:37 dholland Exp $ */
2 /*-
3 * Copyright (c) 2011 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by David A. Holland.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: quota_open.c,v 1.5 2012/01/25 17:43:37 dholland Exp $");
33
34 #include <sys/types.h>
35 #include <sys/statvfs.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include <errno.h>
40
41 #include <quota.h>
42 #include "quotapvt.h"
43
44 struct quotahandle *
45 quota_open(const char *path)
46 {
47
48 struct statvfs stv;
49 struct quotahandle *qh;
50 int mode;
51 int serrno;
52
53 /*
54 * Probe order:
55 *
56 * 1. Check for NFS. NFS quota ops don't go to the kernel
57 * at all but instead do RPCs to the NFS server's
58 * rpc.rquotad, so it doesn't matter what the kernel
59 * thinks.
60 *
61 * 2. Check if quotas are enabled in the mount flags. If
62 * so, we can do quotactl calls.
63 *
64 * 3. Check if the volume is listed in fstab as one of
65 * the filesystem types supported by quota_oldfiles.c,
66 * and with the proper mount options to enable quotas.
67 */
68
69 if (statvfs(path, &stv) < 0) {
70 return NULL;
71 }
72
73 __quota_oldfiles_load_fstab();
74
75 if (!strcmp(stv.f_fstypename, "nfs")) {
76 mode = QUOTA_MODE_NFS;
77 } else if ((stv.f_flag & ST_QUOTA) != 0) {
78 mode = QUOTA_MODE_PROPLIB;
79 } else if (__quota_oldfiles_infstab(stv.f_mntonname)) {
80 mode = QUOTA_MODE_OLDFILES;
81 } else {
82 errno = EOPNOTSUPP;
83 return NULL;
84 }
85
86 qh = malloc(sizeof(*qh));
87 if (qh == NULL) {
88 return NULL;
89 }
90
91 /*
92 * Get the mount point from statvfs; this way the passed-in
93 * path can be any path on the volume.
94 */
95
96 qh->qh_mountpoint = strdup(stv.f_mntonname);
97 if (qh->qh_mountpoint == NULL) {
98 serrno = errno;
99 free(qh);
100 errno = serrno;
101 return NULL;
102 }
103
104 qh->qh_mountdevice = strdup(stv.f_mntfromname);
105 if (qh->qh_mountdevice == NULL) {
106 serrno = errno;
107 free(qh->qh_mountpoint);
108 free(qh);
109 errno = serrno;
110 return NULL;
111 }
112
113 qh->qh_mode = mode;
114
115 qh->qh_oldfilesopen = 0;
116 qh->qh_userfile = -1;
117 qh->qh_groupfile = -1;
118
119 return qh;
120 }
121
122 const char *
123 quota_getmountpoint(struct quotahandle *qh)
124 {
125 return qh->qh_mountpoint;
126 }
127
128 const char *
129 quota_getmountdevice(struct quotahandle *qh)
130 {
131 return qh->qh_mountdevice;
132 }
133
134 void
135 quota_close(struct quotahandle *qh)
136 {
137 if (qh->qh_userfile >= 0) {
138 close(qh->qh_userfile);
139 }
140 if (qh->qh_groupfile >= 0) {
141 close(qh->qh_groupfile);
142 }
143 free(qh->qh_mountdevice);
144 free(qh->qh_mountpoint);
145 free(qh);
146 }
147