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pmem: add dax_operations support

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Setup a dax_device to have the same lifetime as the pmem block device
and add a ->direct_access() method that is equivalent to
pmem_direct_access(). Once fs/dax.c has been converted to use
dax_operations the old pmem_direct_access() will be removed.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2017-01-24 23:02:09 -08:00
parent 6568b08b77
commit c1d6e828a3
6 changed files with 70 additions and 33 deletions
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21
tools/testing/nvdimm/pmem-dax.c
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@@ -15,13 +15,13 @@
#include <pmem.h>
#include <nd.h>
long pmem_direct_access(struct block_device *bdev, sector_t sector,
void **kaddr, pfn_t *pfn, long size)
long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn)
{
struct pmem_device *pmem = bdev->bd_queue->queuedata;
resource_size_t offset = sector * 512 + pmem->data_offset;
resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
PFN_PHYS(nr_pages))))
return -EIO;
/*
@@ -34,11 +34,10 @@ long pmem_direct_access(struct block_device *bdev, sector_t sector,
*kaddr = pmem->virt_addr + offset;
page = vmalloc_to_page(pmem->virt_addr + offset);
*pfn = page_to_pfn_t(page);
dev_dbg_ratelimited(disk_to_dev(bdev->bd_disk)->parent,
"%s: sector: %#llx pfn: %#lx\n", __func__,
(unsigned long long) sector, page_to_pfn(page));
pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
__func__, pmem, pgoff, page_to_pfn(page));
return PAGE_SIZE;
return 1;
}
*kaddr = pmem->virt_addr + offset;
@@ -49,6 +48,6 @@ long pmem_direct_access(struct block_device *bdev, sector_t sector,
* requested range.
*/
if (unlikely(pmem->bb.count))
return size;
return pmem->size - pmem->pfn_pad - offset;
return nr_pages;
return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
}