return pfn from direct_access, for XIP
authorJared Hulbert <jaredeh@gmail.com>
Mon, 28 Apr 2008 09:13:02 +0000 (02:13 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 28 Apr 2008 15:58:23 +0000 (08:58 -0700)
commit30afcb4bd2762fa4b87b17ada9500aa46dc10b1b
tree0920f491a37683a8784c146270b98f82a7e0aa2c
parent423bad600443c590f34ed7ce357591f76f48f137
return pfn from direct_access, for XIP

Alter the block device ->direct_access() API to work with the new
get_xip_mem() API (that requires both kaddr and pfn are returned).

Some architectures will not do the right thing in their virt_to_page() for use
by XIP (to translate from the kernel virtual address returned by
direct_access(), to a user mappable pfn in XIP's page fault handler.

However, we can't switch it to just return the pfn and not the kaddr, because
we have no good way to get a kva from a pfn, and XIP requires the kva for its
read(2) and write(2) handlers.  So we have to return both.

Signed-off-by: Jared Hulbert <jaredeh@gmail.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-mm@kvack.org
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/powerpc/sysdev/axonram.c
drivers/block/brd.c
drivers/s390/block/dcssblk.c
fs/ext2/xip.c
include/linux/fs.h