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umount_bsd44.c revision 1.1.1.3 
      1 /*	$NetBSD: umount_bsd44.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_bsd44.c
     39  *
     40  */
     41 
     42 /*
     43  * Unmounting filesystems under BSD 4.4.
     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
     54 umount_fs(char *mntdir, const char *mnttabname, u_int unmount_flags)
     55 {
     56   int error;
     57 
     58 eintr:
     59   error = unmount(mntdir, 0);
     60   if (error < 0)
     61     error = errno;
     62 
     63   switch (error) {
     64   case EINVAL:
     65   case ENOTBLK:
     66   case ENOENT:
     67     plog(XLOG_WARNING, "unmount: %s is not mounted", mntdir);
     68     error = 0;			/* Not really an error */
     69     break;
     70 
     71   case EINTR:
     72     /* not sure why this happens, but it does.  ask kirk one day... */
     73     dlog("%s: unmount: %m", mntdir);
     74     goto eintr;
     75 
     76 #ifdef MNT2_GEN_OPT_FORCE
     77   case EBUSY:
     78   case EIO:
     79   case ESTALE:
     80     /* caller determines if forced unmounts should be used */
     81     if (unmount_flags & AMU_UMOUNT_FORCE) {
     82       error = umount2_fs(mntdir, unmount_flags);
     83       if (error < 0)
     84 	error = errno;
     85       else
     86 	return error;
     87     }
     88     /* fallthrough */
     89 #endif /* MNT2_GEN_OPT_FORCE */
     90 
     91   default:
     92     dlog("%s: unmount: %m", mntdir);
     93     break;
     94   }
     95 
     96   return error;
     97 }
     98 
     99 
    100 #ifdef MNT2_GEN_OPT_FORCE
    101 /* force unmount, no questions asked, without touching mnttab file */
    102 int
    103 umount2_fs(const char *mntdir, u_int unmount_flags)
    104 {
    105   int error = 0;
    106 
    107   if (unmount_flags & AMU_UMOUNT_FORCE) {
    108     plog(XLOG_INFO, "umount2_fs: trying unmount/forced on %s", mntdir);
    109     error = unmount(mntdir, MNT2_GEN_OPT_FORCE);
    110     if (error < 0 && (errno == EINVAL || errno == ENOENT))
    111       error = 0;		/* ignore EINVAL/ENOENT */
    112     if (error < 0)
    113       plog(XLOG_WARNING, "%s: unmount/force: %m", mntdir);
    114     else
    115       dlog("%s: unmount/force: OK", mntdir);
    116   }
    117   return error;
    118 }
    119 #endif /* MNT2_GEN_OPT_FORCE */
    120