1 files changed, 31 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index ecb18a8db373..d90330f26827 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -667,6 +667,37 @@ static void end_bbio_data_read(struct btrfs_bio *bbio)
 }
 
 /*
+ * Populate every free slot in a provided array with folios.
+ *
+ * @nr_folios:   number of folios to allocate
+ * @folio_array: the array to fill with folios; any existing non-NULL entries in
+ *		 the array will be skipped
+ * @extra_gfp:	 the extra GFP flags for the allocation
+ *
+ * Return: 0        if all folios were able to be allocated;
+ *         -ENOMEM  otherwise, the partially allocated folios would be freed and
+ *                  the array slots zeroed
+ */
+int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array,
+			    gfp_t extra_gfp)
+{
+	for (int i = 0; i < nr_folios; i++) {
+		if (folio_array[i])
+			continue;
+		folio_array[i] = folio_alloc(GFP_NOFS | extra_gfp, 0);
+		if (!folio_array[i])
+			goto error;
+	}
+	return 0;
+error:
+	for (int i = 0; i < nr_folios; i++) {
+		if (folio_array[i])
+			folio_put(folio_array[i]);
+	}
+	return -ENOMEM;
+}
+
+/*
  * Populate every free slot in a provided array with pages.
  *
  * @nr_pages:   number of pages to allocate