Commit f4013ca6 authored by Vishal Verma's avatar Vishal Verma
Browse files

Merge branch 'for-5.9/dax' into libnvdimm-for-next 

This contains a handful of dax changes for v5.9. Of the three commits,
one is a print verbosity change, and two are independent fixes that fell
out of the PKS work [1].

[1]: https://lore.kernel.org/linux-nvdimm/20200717072056.73134-1-ira.weiny@intel.com
parents 48778464 eedfd73d

drivers/dax/super.c

+7 −6
Original line number Diff line number Diff line
@@ -80,14 +80,14 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, 
	int err, id;



	if (blocksize != PAGE_SIZE) {

		pr_debug("%s: error: unsupported blocksize for dax\n",

		pr_info("%s: error: unsupported blocksize for dax\n",

				bdevname(bdev, buf));

		return false;

	}



	err = bdev_dax_pgoff(bdev, start, PAGE_SIZE, &pgoff);

	if (err) {

		pr_debug("%s: error: unaligned partition for dax\n",

		pr_info("%s: error: unaligned partition for dax\n",

				bdevname(bdev, buf));

		return false;

	}
@@ -95,7 +95,7 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, 
	last_page = PFN_DOWN((start + sectors - 1) * 512) * PAGE_SIZE / 512;

	err = bdev_dax_pgoff(bdev, last_page, PAGE_SIZE, &pgoff_end);

	if (err) {

		pr_debug("%s: error: unaligned partition for dax\n",

		pr_info("%s: error: unaligned partition for dax\n",

				bdevname(bdev, buf));

		return false;

	}
@@ -103,11 +103,11 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, 
	id = dax_read_lock();

	len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);

	len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn);

	dax_read_unlock(id);



	if (len < 1 || len2 < 1) {

		pr_debug("%s: error: dax access failed (%ld)\n",

		pr_info("%s: error: dax access failed (%ld)\n",

				bdevname(bdev, buf), len < 1 ? len : len2);

		dax_read_unlock(id);

		return false;

	}
@@ -137,9 +137,10 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, 
		put_dev_pagemap(end_pgmap);



	}

	dax_read_unlock(id);



	if (!dax_enabled) {

		pr_debug("%s: error: dax support not enabled\n",

		pr_info("%s: error: dax support not enabled\n",

				bdevname(bdev, buf));

		return false;

	}

fs/dax.c

+6 −7
Original line number Diff line number Diff line
@@ -680,21 +680,20 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping, 
	return __dax_invalidate_entry(mapping, index, false);

}



static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,

		sector_t sector, size_t size, struct page *to,

		unsigned long vaddr)

static int copy_cow_page_dax(struct block_device *bdev, struct dax_device *dax_dev,

			     sector_t sector, struct page *to, unsigned long vaddr)

{

	void *vto, *kaddr;

	pgoff_t pgoff;

	long rc;

	int id;



	rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);

	rc = bdev_dax_pgoff(bdev, sector, PAGE_SIZE, &pgoff);

	if (rc)

		return rc;



	id = dax_read_lock();

	rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, NULL);

	rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(PAGE_SIZE), &kaddr, NULL);

	if (rc < 0) {

		dax_read_unlock(id);

		return rc;
@@ -1305,8 +1304,8 @@ static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp, 
			clear_user_highpage(vmf->cow_page, vaddr);

			break;

		case IOMAP_MAPPED:

			error = copy_user_dax(iomap.bdev, iomap.dax_dev,

					sector, PAGE_SIZE, vmf->cow_page, vaddr);

			error = copy_cow_page_dax(iomap.bdev, iomap.dax_dev,

						  sector, vmf->cow_page, vaddr);

			break;

		default:

			WARN_ON_ONCE(1);

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