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* vm_area and vm_page now have a new field "mappings" where they will store lists of vm_page_mapping structures. vm_page::ref_count is gone, as it's no longer needed (it was never updated correctly, anyway). * vm_caches now have a type field, ie. CACHE_TYPE_RAM for anonymous areas - this makes the stores a bit less independent, but is quite handy in several places. * Added new vm_map_page() and vm_unmap_pages() functions to be used whenever you map in or unmap pages into/from an area. They don't do much more than handling vm_page::wired_count correctly right now, though (ie. B_LAZY_LOCK is now working as expected as well). * Moved the device fault handler to vm_map_physical_memory(); it was not really used as a fault handler, anyway. * Didn't notice Ingo's changes to the I/O space region broke lock_memory(). It now checks the type of the area that contains the memory, and doesn't lock anymore if not needed which solves the problem in a platform independent way. * Implemented lock_memory() and unlock_memory() for real: they now change the vm_page::wired_count member to identify pages that shouldn't be paged out. * vm_area_for() now uses vm_area_lookup() internally. * Fixed various potential overflow conditions with areas that reach 0xffffffff. * Creating anonymous areas with B_FULL_LOCK no longer causes vm_soft_fault() to be called, instead, the pages are allocated and mapped (via vm_map_page()) directly. * Removed the _vm_ prefix for create_area_struct() and create_reserved_area_struct(). * Fixed a bug in vm_page_write_modified() that would not have enqueued pages that failed to be written to the modified queue again when needed. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20251 a95241bf-73f2-0310-859d-f6bbb57e9c96