1 /* $NetBSD: umount_aix.c,v 1.1.1.3 2015/01/17 16:34:16 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/conf/umount/umount_aix.c
39 *
40 */
41
42 /*
43 * AIX method of unmounting filesystems.
44 */
45
46 #ifdef HAVE_CONFIG_H
47 # include <config.h>
48 #endif /* HAVE_CONFIG_H */
49 #include <am_defs.h>
50 #include <amu.h>
51
52
53 int
umount_fs(char * mntdir,const char * mnttabname,u_int unmount_flags)54 umount_fs(char *mntdir, const char *mnttabname, u_int unmount_flags)
55 {
56 mntlist *mlist, *mp, *mp_save = NULL;
57 int error = 0;
58
59 mp = mlist = read_mtab(mntdir, mnttabname);
60
61 /*
62 * Search the mount table looking for
63 * the correct (ie last) matching entry
64 */
65 while (mp) {
66 if (STREQ(mp->mnt->mnt_dir, mntdir))
67 mp_save = mp;
68 mp = mp->mnext;
69 }
70
71 if (mp_save) {
72 dlog("Trying unmount(%s)", mp_save->mnt->mnt_dir);
73
74 #ifdef MOUNT_TABLE_ON_FILE
75 /*
76 * This unmount may hang leaving this process with an exclusive lock on
77 * /etc/mtab. Therefore it is necessary to unlock mtab, do the unmount,
78 * then lock mtab (again) and reread it and finally update it.
79 */
80 unlock_mntlist();
81 #endif /* MOUNT_TABLE_ON_FILE */
82
83 #ifdef NEED_AUTOFS_SPACE_HACK
84 if (unmount_flags & AMU_UMOUNT_AUTOFS) {
85 char *mnt_dir_save = mp_save->mnt->mnt_dir;
86 mp_save->mnt->mnt_dir = autofs_strdup_space_hack(mnt_dir_save);
87 error = UNMOUNT_TRAP(mp_save->mnt);
88 XFREE(mp_save->mnt->mnt_dir);
89 mp_save->mnt->mnt_dir = mnt_dir_save;
90 } else
91 #endif /* NEED_AUTOFS_SPACE_HACK */
92 error = UNMOUNT_TRAP(mp_save->mnt);
93 if (error < 0) {
94 switch ((error = errno)) {
95 case EINVAL:
96 case ENOTBLK:
97 plog(XLOG_WARNING, "unmount: %s is not mounted", mp_save->mnt->mnt_dir);
98 error = 0; /* Not really an error */
99 break;
100
101 case ENOENT:
102 /*
103 * This could happen if the kernel insists on following symlinks
104 * when we try to unmount a direct mountpoint. We need to propagate
105 * the error up so that the top layers know it failed and don't
106 * try to rmdir() the mountpoint or other silly things.
107 */
108 plog(XLOG_ERROR, "mount point %s: %m", mp_save->mnt->mnt_dir);
109 break;
110
111 #if defined(MNT2_GEN_OPT_FORCE) && defined(HAVE_UVMOUNT)
112 case EBUSY:
113 case EIO:
114 case ESTALE:
115 /* caller determines if forced unmounts should be used */
116 if (unmount_flags & AMU_UMOUNT_FORCE) {
117 error = umount2_fs(mntdir, unmount_flags);
118 if (error < 0)
119 error = errno;
120 else
121 break; /* all is OK */
122 }
123 /* fallthrough */
124 #endif /* MNT2_GEN_OPT_FORCE && HAVE_UVMOUNT */
125 default:
126 dlog("%s: unmount: %m", mp_save->mnt->mnt_dir);
127 break;
128 }
129 }
130 dlog("Finished unmount(%s)", mp_save->mnt->mnt_dir);
131
132 if (!error) {
133 #ifdef MOUNT_TABLE_ON_FILE
134 free_mntlist(mlist);
135 mp = mlist = read_mtab(mntdir, mnttabname);
136
137 /*
138 * Search the mount table looking for
139 * the correct (ie last) matching entry
140 */
141 mp_save = NULL;
142 while (mp) {
143 if (STREQ(mp->mnt->mnt_dir, mntdir))
144 mp_save = mp;
145 mp = mp->mnext;
146 }
147
148 if (mp_save) {
149 mnt_free(mp_save->mnt);
150 mp_save->mnt = NULL;
151 rewrite_mtab(mlist, mnttabname);
152 }
153 #endif /* MOUNT_TABLE_ON_FILE */
154 }
155
156 } else {
157
158 plog(XLOG_ERROR, "Couldn't find how to unmount %s", mntdir);
159 /*
160 * Assume it is already unmounted
161 */
162 error = 0;
163 } /* end of "if (mp_save)" statement */
164
165 free_mntlist(mlist);
166
167 return error;
168 }
169
170
171 #if defined(MNT2_GEN_OPT_FORCE) && defined(HAVE_UVMOUNT)
172 /* force unmount, no questions asked, without touching mnttab file */
173 int
umount2_fs(const char * mntdir,u_int unmount_flags)174 umount2_fs(const char *mntdir, u_int unmount_flags)
175 {
176 int error = 0;
177 #if 0
178 u_int vfs_id = 0;
179 #endif /* 0 */
180
181 if (unmount_flags & AMU_UMOUNT_FORCE) {
182 plog(XLOG_INFO, "**UNIMPLEMENTED**: umount2_fs: trying unmount/forced on %s", mntdir);
183 #if 0
184 /*
185 * XXX: need to implement. Call read_mtab and search mntlist for VFS ID
186 * of mntdir, then pass that ID to uvmount(), then call free_mntlist().
187 */
188 error = uvmount(vfs_id, MNT2_GEN_OPT_FORCE); /* AIX */
189 if (error < 0 && (errno == EINVAL || errno == ENOENT))
190 error = 0; /* ignore EINVAL/ENOENT */
191 if (error < 0)
192 plog(XLOG_WARNING, "%u: unmount/force: %m", vfs_id);
193 else
194 dlog("%s: unmount/force: OK", mntdir);
195 #endif /* 0 */
196 }
197 return error;
198 }
199 #endif /* MNT2_GEN_OPT_FORCE && HAVE_UVMOUNT */
200