SG: Change sg_set_page() to take length and offset argument

Most drivers need to set length and offset as well, so may as well fold
those three lines into one.

Add sg_assign_page() for those two locations that only needed to set
the page, where the offset/length is set outside of the function context.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 7 insertions, 16 deletions

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 0a9882e..7a472b1 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -282,10 +282,8 @@ int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 	while (size > 0 && i < sg_size) {
 		pg = virt_to_page(addr);
 		offset = offset_in_page(addr);
-		if (sg) {
-			sg_set_page(&sg[i], pg);
-			sg[i].offset = offset;
-		}
+		if (sg)
+			sg_set_page(&sg[i], pg, 0, offset);
 		remainder_of_page = PAGE_CACHE_SIZE - offset;
 		if (size >= remainder_of_page) {
 			if (sg)
@@ -716,12 +714,8 @@ ecryptfs_encrypt_page_offset(struct ecryptfs_crypt_stat *crypt_stat,
 	sg_init_table(&src_sg, 1);
 	sg_init_table(&dst_sg, 1);
 
-	sg_set_page(&src_sg, src_page);
-	src_sg.offset = src_offset;
-	src_sg.length = size;
-	sg_set_page(&dst_sg, dst_page);
-	dst_sg.offset = dst_offset;
-	dst_sg.length = size;
+	sg_set_page(&src_sg, src_page, size, src_offset);
+	sg_set_page(&dst_sg, dst_page, size, dst_offset);
 	return encrypt_scatterlist(crypt_stat, &dst_sg, &src_sg, size, iv);
 }
 
@@ -746,14 +740,11 @@ ecryptfs_decrypt_page_offset(struct ecryptfs_crypt_stat *crypt_stat,
 	struct scatterlist src_sg, dst_sg;
 
 	sg_init_table(&src_sg, 1);
+	sg_set_page(&src_sg, src_page, size, src_offset);
+
 	sg_init_table(&dst_sg, 1);
+	sg_set_page(&dst_sg, dst_page, size, dst_offset);
 
-	sg_set_page(&src_sg, src_page);
-	src_sg.offset = src_offset;
-	src_sg.length = size;
-	sg_set_page(&dst_sg, dst_page);
-	dst_sg.offset = dst_offset;
-	dst_sg.length = size;
 	return decrypt_scatterlist(crypt_stat, &dst_sg, &src_sg, size, iv);
 }