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authorMatthew Wilcox (Oracle) <willy@infradead.org>2021-05-07 15:05:06 -0400
committerMatthew Wilcox (Oracle) <willy@infradead.org>2021-10-18 07:49:39 -0400
commit715cbfd6c5c595bc8b7a6f9ad1fe9fec0122bb20 (patch)
tree029dfa5ed425a0a06fc6c00885c68f3eeaaf2b5e /mm/util.c
parent19138349ed59b90ce58aca319b873eca2e04ad43 (diff)
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mm/migrate: Add folio_migrate_copy()
This is the folio equivalent of migrate_page_copy(), which is retained as a wrapper for filesystems which are not yet converted to folios. Also convert copy_huge_page() to folio_copy(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Zi Yan <ziy@nvidia.com> Acked-by: Vlastimil Babka <vbabka@suse.cz>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c21
1 files changed, 17 insertions, 4 deletions
diff --git a/mm/util.c b/mm/util.c
index bf860838282c..e58151a61255 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -747,13 +747,26 @@ int __page_mapcount(struct page *page)
}
EXPORT_SYMBOL_GPL(__page_mapcount);
-void copy_huge_page(struct page *dst, struct page *src)
+/**
+ * folio_copy - Copy the contents of one folio to another.
+ * @dst: Folio to copy to.
+ * @src: Folio to copy from.
+ *
+ * The bytes in the folio represented by @src are copied to @dst.
+ * Assumes the caller has validated that @dst is at least as large as @src.
+ * Can be called in atomic context for order-0 folios, but if the folio is
+ * larger, it may sleep.
+ */
+void folio_copy(struct folio *dst, struct folio *src)
{
- unsigned i, nr = compound_nr(src);
+ long i = 0;
+ long nr = folio_nr_pages(src);
- for (i = 0; i < nr; i++) {
+ for (;;) {
+ copy_highpage(folio_page(dst, i), folio_page(src, i));
+ if (++i == nr)
+ break;
cond_resched();
- copy_highpage(nth_page(dst, i), nth_page(src, i));
}
}