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authorJared Hulbert <jaredeh@gmail.com>2008-04-28 02:13:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:23 -0700
commit30afcb4bd2762fa4b87b17ada9500aa46dc10b1b (patch)
tree0920f491a37683a8784c146270b98f82a7e0aa2c /drivers/s390
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')
-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);
static int dcssblk_release(struct inode *inode, struct file *filp);
static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
- unsigned long *data);
+ void **kaddr, unsigned long *pfn);
static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
@@ -636,7 +636,7 @@ fail:
static int
dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
- unsigned long *data)
+ void **kaddr, unsigned long *pfn)
{
struct dcssblk_dev_info *dev_info;
unsigned long pgoff;
@@ -649,7 +649,9 @@ dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
pgoff = secnum / (PAGE_SIZE / 512);
if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start)
return -ERANGE;
- *data = (unsigned long) (dev_info->start+pgoff*PAGE_SIZE);
+ *kaddr = (void *) (dev_info->start+pgoff*PAGE_SIZE);
+ *pfn = virt_to_phys(*kaddr) >> PAGE_SHIFT;
+
return 0;
}