[PATCH v4 3/9] dax: drop size parameter to ->direct_access()

From: Dan Williams <dan.j.williams@intel.com>
To: linux-kernel@vger.kernel.org
Cc: axboe@kernel.dk, boaz@plexistor.com, david@fromorbit.com,
	linux-arch@vger.kernel.org, arnd@arndb.de,
	ross.zwisler@linux.intel.com, linux-nvdimm@ml01.01.org,
	benh@kernel.crashing.org, linux-fsdevel@vger.kernel.org,
	heiko.carstens@de.ibm.com, hch@lst.de, tj@kernel.org,
	paulus@samba.org, hpa@zytor.com, schwidefsky@de.ibm.com,
	willy@linux.intel.com, akpm@linux-foundation.org,
	torvalds@linux-foundation.org, mingo@kernel.org
Subject: [PATCH v4 3/9] dax: drop size parameter to ->direct_access()
Date: Fri, 05 Jun 2015 17:19:18 -0400	[thread overview]
Message-ID: <20150605211918.20751.21557.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <20150605205052.20751.77149.stgit@dwillia2-desk3.amr.corp.intel.com>

None of the implementations currently use it.  The common
bdev_direct_access() entry point handles all the size checks before
calling ->direct_access().

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 arch/powerpc/sysdev/axonram.c |    2 +-
 drivers/block/brd.c           |    6 +-----
 drivers/block/pmem.c          |    2 +-
 drivers/s390/block/dcssblk.c  |    4 ++--
 fs/block_dev.c                |    2 +-
 include/linux/blkdev.h        |    2 +-
 6 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index ee90db17b097..e8657d3bc588 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -141,7 +141,7 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio)
  */
 static long
 axon_ram_direct_access(struct block_device *device, sector_t sector,
-		       void **kaddr, unsigned long *pfn, long size)
+		       void **kaddr, unsigned long *pfn)
 {
 	struct axon_ram_bank *bank = device->bd_disk->private_data;
 	loff_t offset = (loff_t)sector << AXON_RAM_SECTOR_SHIFT;
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 64ab4951e9d6..41528857c70d 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -371,7 +371,7 @@ static int brd_rw_page(struct block_device *bdev, sector_t sector,
 
 #ifdef CONFIG_BLK_DEV_RAM_DAX
 static long brd_direct_access(struct block_device *bdev, sector_t sector,
-			void **kaddr, unsigned long *pfn, long size)
+			void **kaddr, unsigned long *pfn)
 {
 	struct brd_device *brd = bdev->bd_disk->private_data;
 	struct page *page;
@@ -384,10 +384,6 @@ static long brd_direct_access(struct block_device *bdev, sector_t sector,
 	*kaddr = page_address(page);
 	*pfn = page_to_pfn(page);
 
-	/*
-	 * TODO: If size > PAGE_SIZE, we could look to see if the next page in
-	 * the file happens to be mapped to the next page of physical RAM.
-	 */
 	return PAGE_SIZE;
 }
 #else
diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c
index eabf4a8d0085..1f5b5a6288c0 100644
--- a/drivers/block/pmem.c
+++ b/drivers/block/pmem.c
@@ -98,7 +98,7 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
 }
 
 static long pmem_direct_access(struct block_device *bdev, sector_t sector,
-			      void **kaddr, unsigned long *pfn, long size)
+			      void **kaddr, unsigned long *pfn)
 {
 	struct pmem_device *pmem = bdev->bd_disk->private_data;
 	size_t offset = sector << 9;
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index da212813f2d5..2f1734ba0e22 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -29,7 +29,7 @@ static int dcssblk_open(struct block_device *bdev, fmode_t mode);
 static void dcssblk_release(struct gendisk *disk, fmode_t mode);
 static void dcssblk_make_request(struct request_queue *q, struct bio *bio);
 static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
-				 void **kaddr, unsigned long *pfn, long size);
+				 void **kaddr, unsigned long *pfn);
 
 static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
 
@@ -879,7 +879,7 @@ fail:
 
 static long
 dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
-			void **kaddr, unsigned long *pfn, long size)
+			void **kaddr, unsigned long *pfn)
 {
 	struct dcssblk_dev_info *dev_info;
 	unsigned long offset, dev_sz;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index f04c873a7365..19750f058495 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -453,7 +453,7 @@ long bdev_direct_access(struct block_device *bdev, sector_t sector,
 	sector += get_start_sect(bdev);
 	if (sector % (PAGE_SIZE / 512))
 		return -EINVAL;
-	avail = ops->direct_access(bdev, sector, addr, pfn, size);
+	avail = ops->direct_access(bdev, sector, addr, pfn);
 	if (!avail)
 		return -ERANGE;
 	return min(avail, size);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 31cd832cebb7..535b82f790a6 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1553,7 +1553,7 @@ struct block_device_operations {
 	int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
 	int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
 	long (*direct_access)(struct block_device *, sector_t,
-					void **, unsigned long *pfn, long size);
+					void **, unsigned long *pfn);
 	unsigned int (*check_events) (struct gendisk *disk,
 				      unsigned int clearing);
 	/* ->media_changed() is DEPRECATED, use ->check_events() instead */

