/**
* mnt_context_do_umount:
* @cxt: mount context
*
* Umount filesystem by umount(2) or fork()+exec(/sbin/umount.type).
* Unnecessary for mnt_context_umount().
*
* See also mnt_context_disable_helpers().
*
* WARNING: non-zero return code does not mean that umount(2) syscall or
* umount.type helper wasn't successfully called.
*
* Check mnt_context_get_status() after error!
*
* Returns: 0 on success;
* >0 in case of umount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
int mnt_context_do_umount(struct libmnt_context *cxt)
{
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper_exec_status == 1);
assert(cxt->syscall_status == 1);
assert((cxt->flags & MNT_FL_PREPARED));
assert((cxt->action == MNT_ACT_UMOUNT));
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
rc = do_umount(cxt);
if (rc)
return rc;
if (mnt_context_get_status(cxt) && !mnt_context_is_fake(cxt)) {
/*
* Umounted, do some post-umount operations
* - remove loopdev
* - refresh in-memory mtab stuff if remount rather than
* umount has been performed
*/
if (mnt_context_is_loopdel(cxt)
&& !(cxt->mountflags & MS_REMOUNT))
rc = mnt_context_delete_loopdev(cxt);
if (!mnt_context_is_nomtab(cxt)
&& mnt_context_get_status(cxt)
&& !cxt->helper
&& mnt_context_is_rdonly_umount(cxt)
&& (cxt->mountflags & MS_REMOUNT)) {
/* use "remount" instead of "umount" in /etc/mtab */
if (!rc && cxt->update && cxt->mtab_writable)
rc = mnt_update_set_fs(cxt->update,
cxt->mountflags, NULL, cxt->fs);
}
}
return rc;
}
/*
* Clears loopdev stuff in context, should be called after
* failed or successful mount(2).
*/
int mnt_context_clear_loopdev(struct libmnt_context *cxt)
{
assert(cxt);
if (mnt_context_get_status(cxt) == 0 &&
(cxt->flags & MNT_FL_LOOPDEV_READY)) {
/*
* mount(2) failed, delete loopdev
*/
mnt_context_delete_loopdev(cxt);
} else if (cxt->loopdev_fd > -1) {
/*
* mount(2) success, close the device
*/
DBG(LOOP, ul_debugobj(cxt, "closing FD"));
close(cxt->loopdev_fd);
}
cxt->loopdev_fd = -1;
return 0;
}
