Merge tag 'io_uring-20190323' of git://git.kernel.dk/linux-block

Pull io_uring fixes and improvements from Jens Axboe:
 "The first five in this series are heavily inspired by the work Al did
  on the aio side to fix the races there.

  The last two re-introduce a feature that was in io_uring before it got
  merged, but which I pulled since we didn't have a good way to have
  BVEC iters that already have a stable reference. These aren't
  necessarily related to block, it's just how io_uring pins fixed
  buffers"

* tag 'io_uring-20190323' of git://git.kernel.dk/linux-block:
  block: add BIO_NO_PAGE_REF flag
  iov_iter: add ITER_BVEC_FLAG_NO_REF flag
  io_uring: mark me as the maintainer
  io_uring: retry bulk slab allocs as single allocs
  io_uring: fix poll races
  io_uring: fix fget/fput handling
  io_uring: add prepped flag
  io_uring: make io_read/write return an integer
  io_uring: use regular request ref counts

1 files changed, 7 insertions, 5 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index e9faa52bb489..78d3257435c0 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -336,12 +336,14 @@ static void blkdev_bio_end_io(struct bio *bio)
 	if (should_dirty) {
 		bio_check_pages_dirty(bio);
 	} else {
-		struct bio_vec *bvec;
-		int i;
-		struct bvec_iter_all iter_all;
+		if (!bio_flagged(bio, BIO_NO_PAGE_REF)) {
+			struct bvec_iter_all iter_all;
+			struct bio_vec *bvec;
+			int i;
 
-		bio_for_each_segment_all(bvec, bio, i, iter_all)
-			put_page(bvec->bv_page);
+			bio_for_each_segment_all(bvec, bio, i, iter_all)
+				put_page(bvec->bv_page);
+		}
 		bio_put(bio);
 	}
 }