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umount_bsd44.c revision 1.1 
      1 /*	$NetBSD: umount_bsd44.c,v 1.1 2008/09/19 20:07:19 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997-2007 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_bsd44.c
     43  *
     44  */
     45 
     46 /*
     47  * Unmounting filesystems under BSD 4.4.
     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   int error;
     61 
     62 eintr:
     63   error = unmount(mntdir, 0);
     64   if (error < 0)
     65     error = errno;
     66 
     67   switch (error) {
     68   case EINVAL:
     69   case ENOTBLK:
     70   case ENOENT:
     71     plog(XLOG_WARNING, "unmount: %s is not mounted", mntdir);
     72     error = 0;			/* Not really an error */
     73     break;
     74 
     75   case EINTR:
     76     /* not sure why this happens, but it does.  ask kirk one day... */
     77     dlog("%s: unmount: %m", mntdir);
     78     goto eintr;
     79 
     80 #ifdef MNT2_GEN_OPT_FORCE
     81   case EBUSY:
     82   case EIO:
     83   case ESTALE:
     84     /* caller determines if forced unmounts should be used */
     85     if (unmount_flags & AMU_UMOUNT_FORCE) {
     86       error = umount2_fs(mntdir, unmount_flags);
     87       if (error < 0)
     88 	error = errno;
     89       else
     90 	return error;
     91     }
     92     /* fallthrough */
     93 #endif /* MNT2_GEN_OPT_FORCE */
     94 
     95   default:
     96     dlog("%s: unmount: %m", mntdir);
     97     break;
     98   }
     99 
    100   return error;
    101 }
    102 
    103 
    104 #ifdef MNT2_GEN_OPT_FORCE
    105 /* force unmount, no questions asked, without touching mnttab file */
    106 int
    107 umount2_fs(const char *mntdir, u_int unmount_flags)
    108 {
    109   int error = 0;
    110 
    111   if (unmount_flags & AMU_UMOUNT_FORCE) {
    112     plog(XLOG_INFO, "umount2_fs: trying unmount/forced on %s", mntdir);
    113     error = unmount(mntdir, MNT2_GEN_OPT_FORCE);
    114     if (error < 0 && (errno == EINVAL || errno == ENOENT))
    115       error = 0;		/* ignore EINVAL/ENOENT */
    116     if (error < 0)
    117       plog(XLOG_WARNING, "%s: unmount/force: %m", mntdir);
    118     else
    119       dlog("%s: unmount/force: OK", mntdir);
    120   }
    121   return error;
    122 }
    123 #endif /* MNT2_GEN_OPT_FORCE */
    124