jfs: Convert drop_metapage and remove_metapage to take a folio

All callers now have a folio, so pass it in instead of the page.
Removes a couple of calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

Author: Matthew Wilcox (Oracle)

fs/jfs/jfs_metapage.c

@@ -112,10 +112,10 @@ static inline int insert_metapage(struct folio *folio, struct metapage *mp)
 	return 0;
 }
 
-static inline void remove_metapage(struct page *page, struct metapage *mp)
+static inline void remove_metapage(struct folio *folio, struct metapage *mp)
 {
-	struct meta_anchor *a = mp_anchor(page);
-	int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits;
+	struct meta_anchor *a = folio->private;
+	int l2mp_blocks = L2PSIZE - folio->mapping->host->i_blkbits;
 	int index;
 
 	index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1);
@@ -125,8 +125,8 @@ static inline void remove_metapage(struct page *page, struct metapage *mp)
 	a->mp[index] = NULL;
 	if (--a->mp_count == 0) {
 		kfree(a);
-		detach_page_private(page);
-		kunmap(page);
+		folio_detach_private(folio);
+		kunmap(&folio->page);
 	}
 }
 
@@ -156,10 +156,10 @@ static inline int insert_metapage(struct folio *folio, struct metapage *mp)
 	return 0;
 }
 
-static inline void remove_metapage(struct page *page, struct metapage *mp)
+static inline void remove_metapage(struct folio *folio, struct metapage *mp)
 {
-	detach_page_private(page);
-	kunmap(page);
+	folio_detach_private(folio);
+	kunmap(&folio->page);
 }
 
 #define inc_io(page) do {} while(0)
@@ -214,12 +214,12 @@ void metapage_exit(void)
 	kmem_cache_destroy(metapage_cache);
 }
 
-static inline void drop_metapage(struct page *page, struct metapage *mp)
+static inline void drop_metapage(struct folio *folio, struct metapage *mp)
 {
 	if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) ||
 	    test_bit(META_io, &mp->flag))
 		return;
-	remove_metapage(page, mp);
+	remove_metapage(folio, mp);
 	INCREMENT(mpStat.pagefree);
 	free_metapage(mp);
 }
@@ -539,7 +539,7 @@ static bool metapage_release_folio(struct folio *folio, gfp_t gfp_mask)
 		}
 		if (mp->lsn)
 			remove_from_logsync(mp);
-		remove_metapage(&folio->page, mp);
+		remove_metapage(folio, mp);
 		INCREMENT(mpStat.pagefree);
 		free_metapage(mp);
 	}
@@ -774,7 +774,7 @@ void release_metapage(struct metapage * mp)
 		remove_from_logsync(mp);
 
 	/* Try to keep metapages from using up too much memory */
-	drop_metapage(&folio->page, mp);
+	drop_metapage(folio, mp);
 
 	folio_unlock(folio);
 	folio_put(folio);