From: Carsten Otte <cotte@de.ibm.com>

dcss segment interface changes:
 - Add check when loading segments to avoid out of range mappings.
 - Add code to check for segment_load returning -ERANGE.
 - Rename segment_info to segment_type.
 - Restore previous segment state if reload fails.
 - Add segment_modify_shared() to change shared attributes of a dcss
   segment and use it in the dcss block device driver.
 - Add support for contiguous EW/EN multipart segments.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>