1 /* $NetBSD: umount_default.c,v 1.1.1.2 2009/03/20 20:26:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 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. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/conf/umount/umount_default.c 43 * 44 */ 45 46 /* 47 * Default method of unmounting filesystems. 48 */ 49 50 #ifdef HAVE_CONFIG_H 51 # include <config.h> 52 #endif /* HAVE_CONFIG_H */ 53 #include <am_defs.h> 54 #include <amu.h> 55 56 57 int 58 umount_fs(char *mntdir, const char *mnttabname, u_int unmount_flags) 59 { 60 mntlist *mlist, *mp, *mp_save = NULL; 61 int error = 0; 62 63 mp = mlist = read_mtab(mntdir, mnttabname); 64 65 /* 66 * Search the mount table looking for 67 * the correct (ie last) matching entry 68 */ 69 while (mp) { 70 if (STREQ(mp->mnt->mnt_dir, mntdir)) 71 mp_save = mp; 72 mp = mp->mnext; 73 } 74 75 if (mp_save) { 76 dlog("Trying unmount(%s)", mp_save->mnt->mnt_dir); 77 78 #ifdef MOUNT_TABLE_ON_FILE 79 /* 80 * This unmount may hang leaving this process with an exclusive lock on 81 * /etc/mtab. Therefore it is necessary to unlock mtab, do the unmount, 82 * then lock mtab (again) and reread it and finally update it. 83 */ 84 unlock_mntlist(); 85 #endif /* MOUNT_TABLE_ON_FILE */ 86 87 #ifdef NEED_AUTOFS_SPACE_HACK 88 if (unmount_flags & AMU_UMOUNT_AUTOFS) { 89 char *mnt_dir_save = mp_save->mnt->mnt_dir; 90 mp_save->mnt->mnt_dir = autofs_strdup_space_hack(mnt_dir_save); 91 error = UNMOUNT_TRAP(mp_save->mnt); 92 XFREE(mp_save->mnt->mnt_dir); 93 mp_save->mnt->mnt_dir = mnt_dir_save; 94 } else 95 #endif /* NEED_AUTOFS_SPACE_HACK */ 96 error = UNMOUNT_TRAP(mp_save->mnt); 97 if (error < 0) { 98 switch ((error = errno)) { 99 case EINVAL: 100 case ENOTBLK: 101 plog(XLOG_WARNING, "unmount: %s is not mounted", mp_save->mnt->mnt_dir); 102 error = 0; /* Not really an error */ 103 break; 104 105 case ENOENT: 106 /* 107 * This could happen if the kernel insists on following symlinks 108 * when we try to unmount a direct mountpoint. We need to propagate 109 * the error up so that the top layers know it failed and don't 110 * try to rmdir() the mountpoint or other silly things. 111 */ 112 plog(XLOG_ERROR, "mount point %s: %m", mp_save->mnt->mnt_dir); 113 break; 114 115 #if defined(MNT2_GEN_OPT_FORCE) && defined(HAVE_UMOUNT2) 116 case EBUSY: 117 case EIO: 118 case ESTALE: 119 /* caller determines if forced unmounts should be used */ 120 if (unmount_flags & AMU_UMOUNT_FORCE) { 121 error = umount2_fs(mntdir, unmount_flags); 122 if (error < 0) 123 error = errno; 124 else 125 break; /* all is OK */ 126 } 127 /* fallthrough */ 128 #endif /* MNT2_GEN_OPT_FORCE && HAVE_UMOUNT2 */ 129 default: 130 dlog("%s: unmount: %m", mp_save->mnt->mnt_dir); 131 break; 132 } 133 } 134 dlog("Finished unmount(%s)", mp_save->mnt->mnt_dir); 135 136 if (!error) { 137 #ifdef MOUNT_TABLE_ON_FILE 138 free_mntlist(mlist); 139 mp = mlist = read_mtab(mntdir, mnttabname); 140 141 /* 142 * Search the mount table looking for 143 * the correct (ie last) matching entry 144 */ 145 mp_save = NULL; 146 while (mp) { 147 if (STREQ(mp->mnt->mnt_dir, mntdir)) 148 mp_save = mp; 149 mp = mp->mnext; 150 } 151 152 if (mp_save) { 153 mnt_free(mp_save->mnt); 154 mp_save->mnt = NULL; 155 rewrite_mtab(mlist, mnttabname); 156 } 157 #endif /* MOUNT_TABLE_ON_FILE */ 158 } 159 160 } else { 161 162 plog(XLOG_ERROR, "Couldn't find how to unmount %s", mntdir); 163 /* 164 * Assume it is already unmounted 165 */ 166 error = 0; 167 } /* end of "if (mp_save)" statement */ 168 169 free_mntlist(mlist); 170 171 return error; 172 } 173 174 175 #if defined(MNT2_GEN_OPT_FORCE) && defined(HAVE_UMOUNT2) 176 /* force unmount, no questions asked, without touching mnttab file */ 177 int 178 umount2_fs(const char *mntdir, u_int unmount_flags) 179 { 180 int error = 0; 181 182 if (unmount_flags & AMU_UMOUNT_FORCE) { 183 plog(XLOG_INFO, "umount2_fs: trying unmount/forced on %s", mntdir); 184 error = umount2(mntdir, MNT2_GEN_OPT_FORCE); /* Solaris */ 185 if (error < 0 && (errno == EINVAL || errno == ENOENT)) 186 error = 0; /* ignore EINVAL/ENOENT */ 187 if (error < 0) 188 plog(XLOG_WARNING, "%s: unmount/force: %m", mntdir); 189 else 190 dlog("%s: unmount/force: OK", mntdir); 191 } 192 return error; 193 } 194 #endif /* MNT2_GEN_OPT_FORCE && HAVE_UMOUNT2 */ 195