Subject: linux-next: build failure after merge of the block tree

From: Stephen Rothwell <[email-masked]>
Date: Wed, 16 Jan 2019 13:55:54 +1100

Hi all,

After merging the block tree, today's linux-next build (x86_64
allmodconfig) failed like this:

fs/verity/verify.c: In function 'fsverity_verify_bio':
fs/verity/verify.c:272:38: error: macro "bio_for_each_segment_all" requires 4 arguments, but only 3 given
   bio_for_each_segment_all(bv, bio, i)
                                      ^
fs/verity/verify.c:272:3: error: unknown type name 'bio_for_each_segment_all'
   bio_for_each_segment_all(bv, bio, i)
   ^~~~~~~~~~~~~~~~~~~~~~~~
fs/verity/verify.c:273:19: error: expected ')' before '->' token
    SetPageError(bv->bv_page);
                   ^~
                   )
fs/verity/verify.c:277:37: error: macro "bio_for_each_segment_all" requires 4 arguments, but only 3 given
  bio_for_each_segment_all(bv, bio, i) {
                                     ^
fs/verity/verify.c:277:2: error: 'bio_for_each_segment_all' undeclared (first use in this function); did you mean 'bio_first_page_all'?
  bio_for_each_segment_all(bv, bio, i) {
  ^~~~~~~~~~~~~~~~~~~~~~~~
  bio_first_page_all
fs/verity/verify.c:277:2: note: each undeclared identifier is reported only once for each function it appears in
fs/verity/verify.c:277:26: error: expected ';' before '{' token
  bio_for_each_segment_all(bv, bio, i) {
                          ^            ~
                          ;

Caused by commit

  eb754eb2a953 ("block: allow bio_for_each_segment_all() to iterate over multi-page bvec")

interacting with commit

  281bf3cdf27a ("fs-verity: add data verification hooks for ->readpages()")

I have applied the following merge fix patch:

From: Stephen Rothwell <[email-masked]>
Date: Wed, 16 Jan 2019 13:53:07 +1100
Subject: [PATCH] fs-verity: fix up for bio_for_each_segment_all() API change

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 fs/verity/verify.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/verity/verify.c b/fs/verity/verify.c
index e308f22475e8..dbd388ef32e1 100644
--- a/fs/verity/verify.c
+++ b/fs/verity/verify.c
@@ -266,15 +266,16 @@ void fsverity_verify_bio(struct bio *bio)
 	struct ahash_request *req;
 	struct bio_vec *bv;
 	int i;
+	struct bvec_iter_all iter_all;
 
 	req = ahash_request_alloc(vi->hash_alg->tfm, GFP_KERNEL);
 	if (unlikely(!req)) {
-		bio_for_each_segment_all(bv, bio, i)
+		bio_for_each_segment_all(bv, bio, i, iter_all)
 			SetPageError(bv->bv_page);
 		return;
 	}
 
-	bio_for_each_segment_all(bv, bio, i) {
+	bio_for_each_segment_all(bv, bio, i, iter_all) {
 		struct page *page = bv->bv_page;
 
 		if (!PageError(page) && !verify_page(inode, vi, req, page))
-- 
2.20.1

-- 
Cheers,
Stephen Rothwell