}
/*
- * checksum a dirty tree block before IO. This has extra checks to make sure
- * we only fill in the checksum field in the first page of a multi-page block
+ * Checksum a dirty tree block before IO. This has extra checks to make sure
+ * we only fill in the checksum field in the first page of a multi-page block.
+ * For subpage extent buffers we need bvec to also read the offset in the page.
*/
-
-static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
+static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct bio_vec *bvec)
{
+ struct page *page = bvec->bv_page;
u64 start = page_offset(page);
u64 found_start;
u8 result[BTRFS_CSUM_SIZE];
ASSERT(!bio_flagged(bio, BIO_CLONED));
bio_for_each_segment_all(bvec, bio, iter_all) {
root = BTRFS_I(bvec->bv_page->mapping->host)->root;
- ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
+ ret = csum_dirty_buffer(root->fs_info, bvec);
if (ret)
break;
}