block: add gup flag to bio_add_page()/bio_add_pc_page()/__bio_add_page()

We want to keep track of how we got a reference on page added to bio_vec
ie wether the page was reference through GUP (get_user_page*) or not. So
add a flag to bio_add_page()/bio_add_pc_page()/__bio_add_page() to that
effect.

This is done using a coccinelle patch and running it with:

spatch --sp-file spfile --in-place --include-headers --dir .

with spfile:
%<---------------------------------------------------------------------
@@
identifier I1, I2, I3, I4;
@@
void __bio_add_page(struct bio *I1, struct page *I2, unsigned I3,
unsigned I4
+, bool is_gup
 ) {...}

@@
identifier I1, I2, I3, I4;
@@
void __bio_add_page(struct bio *I1, struct page *I2, unsigned I3,
unsigned I4
+, bool is_gup
 );

@@
identifier I1, I2, I3, I4;
@@
int bio_add_page(struct bio *I1, struct page *I2, unsigned I3,
unsigned I4
+, bool is_gup
 ) {...}

@@
@@
int bio_add_page(struct bio *, struct page *, unsigned, unsigned
+, bool is_gup
 );

@@
identifier I1, I2, I3, I4, I5;
@@
int bio_add_pc_page(struct request_queue *I1, struct bio *I2,
struct page *I3, unsigned I4, unsigned I5
+, bool is_gup
 ) {...}

@@
@@
int bio_add_pc_page(struct request_queue *, struct bio *,
struct page *, unsigned, unsigned
+, bool is_gup
 );

@@
expression E1, E2, E3, E4;
@@
__bio_add_page(E1, E2, E3, E4
+, false
 )

@@
expression E1, E2, E3, E4;
@@
bio_add_page(E1, E2, E3, E4
+, false
 )

@@
expression E1, E2, E3, E4, E5;
@@
bio_add_pc_page(E1, E2, E3, E4, E5
+, false
 )
--------------------------------------------------------------------->%

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-block@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Matthew Wilcox <willy@infradead.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6ac4f6b192e6..05fcc5227d0e 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -429,13 +429,14 @@ extern void bio_uninit(struct bio *);
 extern void bio_reset(struct bio *);
 void bio_chain(struct bio *, struct bio *);
 
-extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
+extern int bio_add_page(struct bio *, struct page *, unsigned int,
+			unsigned int, bool is_gup);
 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
-			   unsigned int, unsigned int);
+			   unsigned int, unsigned int, bool is_gup);
 bool __bio_try_merge_page(struct bio *bio, struct page *page,
 		unsigned int len, unsigned int off, bool same_page);
 void __bio_add_page(struct bio *bio, struct page *page,
-		unsigned int len, unsigned int off);
+		unsigned int len, unsigned int off, bool is_gup);
 int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter);
 struct rq_map_data;
 extern struct bio *bio_map_user_iov(struct request_queue *,