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Subject[PATCH 4/8] pmem: Add support for direct_access()
From: Ross Zwisler <ross.zwisler@linux.intel.com>

Also fixed a top the initial version
[boaz]
SQUASHME pmem: Micro optimization the hotpath 002

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Boaz Harrosh <boaz@plexistor.com>
---
drivers/block/pmem.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c
index 750ffdf..f0f0ba0 100644
--- a/drivers/block/pmem.c
+++ b/drivers/block/pmem.c
@@ -111,9 +111,25 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
return 0;
}

+static long pmem_direct_access(struct block_device *bdev, sector_t sector,
+ void **kaddr, unsigned long *pfn, long size)
+{
+ struct pmem_device *pmem = bdev->bd_disk->private_data;
+ size_t offset = sector << 9;
+
+ if (unlikely(!pmem))
+ return -ENODEV;
+
+ *kaddr = pmem->virt_addr + offset;
+ *pfn = (pmem->phys_addr + offset) >> PAGE_SHIFT;
+
+ return pmem->size - offset;
+}
+
static const struct block_device_operations pmem_fops = {
.owner = THIS_MODULE,
.rw_page = pmem_rw_page,
+ .direct_access = pmem_direct_access,
};

/* Kernel module stuff */
--
1.9.3


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