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authorJane Chu <jane.chu@oracle.com>2022-05-13 15:10:58 -0700
committerDan Williams <dan.j.williams@intel.com>2022-05-16 13:35:56 -0700
commite511c4a3d2a1f64aafc1f5df37a2ffcf7ef91b55 (patch)
treeeccb155ac340c8bd514ab14af30edfc48208b3bd /include/linux/dax.h
parent5898b43af954b83c4a4ee4ab85c4dbafa395822a (diff)
dax: introduce DAX_RECOVERY_WRITE dax access mode
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>
Diffstat (limited to 'include/linux/dax.h')
-rw-r--r--include/linux/dax.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 9fc5f99a0ae2..3f1339bce3c0 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -14,6 +14,11 @@ struct iomap_ops;
struct iomap_iter;
struct iomap;
+enum dax_access_mode {
+ DAX_ACCESS,
+ DAX_RECOVERY_WRITE,
+};
+
struct dax_operations {
/*
* direct_access: translate a device-relative
@@ -21,7 +26,7 @@ struct dax_operations {
* number of pages available for DAX at that pfn.
*/
long (*direct_access)(struct dax_device *, pgoff_t, long,
- void **, pfn_t *);
+ enum dax_access_mode, void **, pfn_t *);
/*
* Validate whether this device is usable as an fsdax backing
* device.
@@ -178,7 +183,7 @@ static inline void dax_read_unlock(int id)
bool dax_alive(struct dax_device *dax_dev);
void *dax_get_private(struct dax_device *dax_dev);
long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
- void **kaddr, pfn_t *pfn);
+ enum dax_access_mode mode, void **kaddr, pfn_t *pfn);
size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
size_t bytes, struct iov_iter *i);
size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,