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/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* File: am-utils/conf/umount/umount_default.c
*
*/
/*
* Default method of unmounting filesystems.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amu.h>
int
umount_fs(char *mntdir, const char *mnttabname, u_int unmount_flags)
{
mntlist *mlist, *mp, *mp_save = NULL;
int error = 0;
mp = mlist = read_mtab(mntdir, mnttabname);
/*
* Search the mount table looking for
* the correct (ie last) matching entry
*/
while (mp) {
if (STREQ(mp->mnt->mnt_dir, mntdir))
mp_save = mp;
mp = mp->mnext;
}
if (mp_save) {
dlog("Trying unmount(%s)", mp_save->mnt->mnt_dir);
#ifdef MOUNT_TABLE_ON_FILE
/*
* This unmount may hang leaving this process with an exclusive lock on
* /etc/mtab. Therefore it is necessary to unlock mtab, do the unmount,
* then lock mtab (again) and reread it and finally update it.
*/
unlock_mntlist();
#endif /* MOUNT_TABLE_ON_FILE */
#ifdef NEED_AUTOFS_SPACE_HACK
if (unmount_flags & AMU_UMOUNT_AUTOFS) {
char *mnt_dir_save = mp_save->mnt->mnt_dir;
mp_save->mnt->mnt_dir = autofs_strdup_space_hack(mnt_dir_save);
error = UNMOUNT_TRAP(mp_save->mnt);
XFREE(mp_save->mnt->mnt_dir);
mp_save->mnt->mnt_dir = mnt_dir_save;
} else
#endif /* NEED_AUTOFS_SPACE_HACK */
error = UNMOUNT_TRAP(mp_save->mnt);
if (error < 0) {
switch ((error = errno)) {
case EINVAL:
case ENOTBLK:
plog(XLOG_WARNING, "unmount: %s is not mounted", mp_save->mnt->mnt_dir);
error = 0; /* Not really an error */
break;
case ENOENT:
/*
* This could happen if the kernel insists on following symlinks
* when we try to unmount a direct mountpoint. We need to propagate
* the error up so that the top layers know it failed and don't
* try to rmdir() the mountpoint or other silly things.
*/
plog(XLOG_ERROR, "mount point %s: %m", mp_save->mnt->mnt_dir);
break;
#if defined(MNT2_GEN_OPT_FORCE) && defined(HAVE_UMOUNT2)
case EBUSY:
case EIO:
case ESTALE:
/* caller determines if forced unmounts should be used */
if (unmount_flags & AMU_UMOUNT_FORCE) {
error = umount2_fs(mntdir, unmount_flags);
if (error < 0)
error = errno;
else
break; /* all is OK */
}
/* fallthrough */
#endif /* MNT2_GEN_OPT_FORCE && HAVE_UMOUNT2 */
default:
dlog("%s: unmount: %m", mp_save->mnt->mnt_dir);
break;
}
}
dlog("Finished unmount(%s)", mp_save->mnt->mnt_dir);
if (!error) {
#ifdef MOUNT_TABLE_ON_FILE
free_mntlist(mlist);
mp = mlist = read_mtab(mntdir, mnttabname);
/*
* Search the mount table looking for
* the correct (ie last) matching entry
*/
mp_save = NULL;
while (mp) {
if (STREQ(mp->mnt->mnt_dir, mntdir))
mp_save = mp;
mp = mp->mnext;
}
if (mp_save) {
mnt_free(mp_save->mnt);
mp_save->mnt = NULL;
rewrite_mtab(mlist, mnttabname);
}
#endif /* MOUNT_TABLE_ON_FILE */
}
} else {
plog(XLOG_ERROR, "Couldn't find how to unmount %s", mntdir);
/*
* Assume it is already unmounted
*/
error = 0;
} /* end of "if (mp_save)" statement */
free_mntlist(mlist);
return error;
}
#if defined(MNT2_GEN_OPT_FORCE) && defined(HAVE_UMOUNT2)
/* force unmount, no questions asked, without touching mnttab file */
int
umount2_fs(const char *mntdir, u_int unmount_flags)
{
int error = 0;
if (unmount_flags & AMU_UMOUNT_FORCE) {
plog(XLOG_INFO, "umount2_fs: trying unmount/forced on %s", mntdir);
error = umount2(mntdir, MNT2_GEN_OPT_FORCE); /* Solaris */
if (error < 0 && (errno == EINVAL || errno == ENOENT))
error = 0; /* ignore EINVAL/ENOENT */
if (error < 0)
plog(XLOG_WARNING, "%s: unmount/force: %m", mntdir);
else
dlog("%s: unmount/force: OK", mntdir);
}
return error;
}
#endif /* MNT2_GEN_OPT_FORCE && HAVE_UMOUNT2 */
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