[patch 003/143] dax: account DAX entries as nrpages

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From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: dax: account DAX entries as nrpages

Simplify mapping_needs_writeback() by accounting DAX entries as pages
instead of exceptional entries.

Link: https://lkml.kernel.org/r/20201026151849.24232-4-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Tested-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/dax.c     |    6 +++---
 mm/filemap.c |    3 ---
 2 files changed, 3 insertions(+), 6 deletions(-)

--- a/fs/dax.c~dax-account-dax-entries-as-nrpages
+++ a/fs/dax.c
@@ -525,7 +525,7 @@ retry:
 		dax_disassociate_entry(entry, mapping, false);
 		xas_store(xas, NULL);	/* undo the PMD join */
 		dax_wake_entry(xas, entry, true);
-		mapping->nrexceptional--;
+		mapping->nrpages -= PG_PMD_NR;
 		entry = NULL;
 		xas_set(xas, index);
 	}
@@ -541,7 +541,7 @@ retry:
 		dax_lock_entry(xas, entry);
 		if (xas_error(xas))
 			goto out_unlock;
-		mapping->nrexceptional++;
+		mapping->nrpages += 1UL << order;
 	}
 
 out_unlock:
@@ -661,7 +661,7 @@ static int __dax_invalidate_entry(struct
 		goto out;
 	dax_disassociate_entry(entry, mapping, trunc);
 	xas_store(&xas, NULL);
-	mapping->nrexceptional--;
+	mapping->nrpages -= 1UL << dax_entry_order(entry);
 	ret = 1;
 out:
 	put_unlocked_entry(&xas, entry);
--- a/mm/filemap.c~dax-account-dax-entries-as-nrpages
+++ a/mm/filemap.c
@@ -618,9 +618,6 @@ EXPORT_SYMBOL(filemap_fdatawait_keep_err
 /* Returns true if writeback might be needed or already in progress. */
 static bool mapping_needs_writeback(struct address_space *mapping)
 {
-	if (dax_mapping(mapping))
-		return mapping->nrexceptional;
-
 	return mapping->nrpages;
 }
 
_



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