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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
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4
include/linux/device-mapper.h
View file

@ -20,6 +20,7 @@ struct dm_table;
struct dm_report_zones_args;
struct mapped_device;
struct bio_vec;
enum dax_access_mode;
/*
* Type of table, mapped_device's mempool and request_queue
@ -146,7 +147,8 @@ typedef int (*dm_busy_fn) (struct dm_target *ti);
* >= 0 : the number of bytes accessible at the address
*/
typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn);
long nr_pages, enum dax_access_mode node, void **kaddr,
pfn_t *pfn);
typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, pgoff_t pgoff,
size_t nr_pages);