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authorJared Hulbert <jaredeh@gmail.com>2008-04-28 05:13:02 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 11:58:23 -0400
commit30afcb4bd2762fa4b87b17ada9500aa46dc10b1b (patch)
tree0920f491a37683a8784c146270b98f82a7e0aa2c /drivers/s390/block/dcssblk.c
parent423bad600443c590f34ed7ce357591f76f48f137 (diff)
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>
Diffstat (limited to 'drivers/s390/block/dcssblk.c')
-rw-r--r--drivers/s390/block/dcssblk.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 04787eab1016..bb52d2fbac18 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -36,7 +36,7 @@ static int dcssblk_open(struct inode *inode, struct file *filp);
36static int dcssblk_release(struct inode *inode, struct file *filp); 36static int dcssblk_release(struct inode *inode, struct file *filp);
37static int dcssblk_make_request(struct request_queue *q, struct bio *bio); 37static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
38static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum, 38static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
39 unsigned long *data); 39 void **kaddr, unsigned long *pfn);
40 40
41static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; 41static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
42 42
@@ -636,7 +636,7 @@ fail:
636 636
637static int 637static int
638dcssblk_direct_access (struct block_device *bdev, sector_t secnum, 638dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
639 unsigned long *data) 639 void **kaddr, unsigned long *pfn)
640{ 640{
641 struct dcssblk_dev_info *dev_info; 641 struct dcssblk_dev_info *dev_info;
642 unsigned long pgoff; 642 unsigned long pgoff;
@@ -649,7 +649,9 @@ dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
649 pgoff = secnum / (PAGE_SIZE / 512); 649 pgoff = secnum / (PAGE_SIZE / 512);
650 if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start) 650 if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start)
651 return -ERANGE; 651 return -ERANGE;
652 *data = (unsigned long) (dev_info->start+pgoff*PAGE_SIZE); 652 *kaddr = (void *) (dev_info->start+pgoff*PAGE_SIZE);
653 *pfn = virt_to_phys(*kaddr) >> PAGE_SHIFT;
654
653 return 0; 655 return 0;
654} 656}
655 657