Kernel doesn't allow mapping through whle device if some
other partition an the device is used.
So first try to find partition device which match
system encryption (== TCRYPT partition system encryption)
and use that.
System encryption hav metadata in space located ouside of
partition itself.
Ideally the check should be automatic but for virtualized systems
(where a partition could be "whole device" for another sustem this
can be dangerous.
2 header inclusions were missing, one for PATH_MAX (limits.h) and one
for FD_ZERO, FD_SET, ... (sys/select.h)
on glibc, those headers are erroneusly (namespace pollution) pulled in
through other headers, so the author didnt notice.
Signed-Off-By: John Spencer <maillist-cryptsetup@barfooze.de>
Allocate loop device late (only when real block device needed).
Rework underlying device/file access functions.
Move all device (and ioctl) access to utils_device.c.
Allows using file where appropriate without allocation loop device.
* Add shared flag to libcryptsetup api.
* Fix plain crypt format parameters to include size option (API change).
git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@559 36d66b0a-2a48-0410-832c-cd162a569da5
