fsverity: don't use bio_first_page_all() in fsverity_verify_bio()

bio_first_page_all(bio)->mapping->host is not compatible with large
folios, since the first page of the bio is not necessarily the head page
of the folio, and therefore it might not have the mapping pointer set.

Therefore, move the dereference of ->mapping->host into
verify_data_blocks(), which works with a folio.

(Like the commit that this Fixes, this hasn't actually been tested with
large folios yet, since the filesystems that use fs/verity/ don't
support that yet.  But based on code review, I think this is needed.)

Fixes: 5d0f0e5 ("fsverity: support verifying data from large folios")
Link: https://lore.kernel.org/r/20230604022101.48342-1-ebiggers@kernel.org
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>

Author: ebiggers

fs/verity/verify.c

@@ -256,9 +256,10 @@ verify_data_block(struct inode *inode, struct fsverity_info *vi,
 }
 
 static bool
-verify_data_blocks(struct inode *inode, struct folio *data_folio,
-		   size_t len, size_t offset, unsigned long max_ra_pages)
+verify_data_blocks(struct folio *data_folio, size_t len, size_t offset,
+		   unsigned long max_ra_pages)
 {
+	struct inode *inode = data_folio->mapping->host;
 	struct fsverity_info *vi = inode->i_verity_info;
 	const unsigned int block_size = vi->tree_params.block_size;
 	u64 pos = (u64)data_folio->index << PAGE_SHIFT;
@@ -298,7 +299,7 @@ verify_data_blocks(struct inode *inode, struct folio *data_folio,
  */
 bool fsverity_verify_blocks(struct folio *folio, size_t len, size_t offset)
 {
-	return verify_data_blocks(folio->mapping->host, folio, len, offset, 0);
+	return verify_data_blocks(folio, len, offset, 0);
 }
 EXPORT_SYMBOL_GPL(fsverity_verify_blocks);
 
@@ -319,7 +320,6 @@ EXPORT_SYMBOL_GPL(fsverity_verify_blocks);
  */
 void fsverity_verify_bio(struct bio *bio)
 {
-	struct inode *inode = bio_first_page_all(bio)->mapping->host;
 	struct folio_iter fi;
 	unsigned long max_ra_pages = 0;
 
@@ -337,7 +337,7 @@ void fsverity_verify_bio(struct bio *bio)
 	}
 
 	bio_for_each_folio_all(fi, bio) {
-		if (!verify_data_blocks(inode, fi.folio, fi.length, fi.offset,
+		if (!verify_data_blocks(fi.folio, fi.length, fi.offset,
 					max_ra_pages)) {
 			bio->bi_status = BLK_STS_IOERR;
 			break;