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| author | Jared Hulbert <jaredeh@gmail.com> | 2008-04-28 02:13:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:23 -0700 |
| commit | 30afcb4bd2762fa4b87b17ada9500aa46dc10b1b (patch) | |
| tree | 0920f491a37683a8784c146270b98f82a7e0aa2c /drivers/s390/block | |
| parent | 423bad600443c590f34ed7ce357591f76f48f137 (diff) | |
| download | op-kernel-dev-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.zip op-kernel-dev-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.tar.gz | |
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')
| -rw-r--r-- | drivers/s390/block/dcssblk.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 04787ea..bb52d2f 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; } |
