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dax: introduce DAX_RECOVERY_WRITE dax access mode

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Up till now, dax_direct_access() is used implicitly for normal
access, but for the purpose of recovery write, dax range with
poison is requested.  To make the interface clear, introduce
	enum dax_access_mode {
		DAX_ACCESS,
		DAX_RECOVERY_WRITE,
	}
where DAX_ACCESS is used for normal dax access, and
DAX_RECOVERY_WRITE is used for dax recovery write.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Vivek Goyal <vgoyal@redhat.com>
Link: https://lore.kernel.org/r/165247982851.52965.11024212198889762949.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jane Chu
2022-05-13 15:10:58 -07:00
committed by Dan Williams
parent 5898b43af9
commit e511c4a3d2
16 changed files with 61 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
fs/dax.c
View File

@@ -721,7 +721,8 @@ static int copy_cow_page_dax(struct vm_fault *vmf, const struct iomap_iter *iter
int id;
id = dax_read_lock();
rc = dax_direct_access(iter->iomap.dax_dev, pgoff, 1, &kaddr, NULL);
rc = dax_direct_access(iter->iomap.dax_dev, pgoff, 1, DAX_ACCESS,
&kaddr, NULL);
if (rc < 0) {
dax_read_unlock(id);
return rc;
@@ -1013,7 +1014,7 @@ static int dax_iomap_pfn(const struct iomap *iomap, loff_t pos, size_t size,
id = dax_read_lock();
length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size),
NULL, pfnp);
DAX_ACCESS, NULL, pfnp);
if (length < 0) {
rc = length;
goto out;
@@ -1122,7 +1123,7 @@ static int dax_memzero(struct dax_device *dax_dev, pgoff_t pgoff,
void *kaddr;
long ret;
ret = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL);
ret = dax_direct_access(dax_dev, pgoff, 1, DAX_ACCESS, &kaddr, NULL);
if (ret > 0) {
memset(kaddr + offset, 0, size);
dax_flush(dax_dev, kaddr + offset, size);
@@ -1247,7 +1248,7 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi,
}
map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
&kaddr, NULL);
DAX_ACCESS, &kaddr, NULL);
if (map_len < 0) {
ret = map_len;
break;