block: never take page references for ITER_BVEC

If we pass pages through an iov_iter we always already have a reference
in the caller.  Thus remove the ITER_BVEC_FLAG_NO_REF and don't take
reference to pages by default for bvec backed iov_iters.

Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 9 deletions

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 2c90a0842ee8..cea1761c5672 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -19,9 +19,6 @@ struct kvec {
 };
 
 enum iter_type {
-        /* set if ITER_BVEC doesn't hold a bv_page ref */
-        ITER_BVEC_FLAG_NO_REF = 2,
-
         /* iter types */
         ITER_IOVEC = 4,
         ITER_KVEC = 8,
@@ -56,7 +53,7 @@ struct iov_iter {
 
 static inline enum iter_type iov_iter_type(const struct iov_iter *i)
 {
-        return i->type & ~(READ | WRITE | ITER_BVEC_FLAG_NO_REF);
+        return i->type & ~(READ | WRITE);
 }
 
 static inline bool iter_is_iovec(const struct iov_iter *i)
@@ -89,11 +86,6 @@ static inline unsigned char iov_iter_rw(const struct iov_iter *i)
         return i->type & (READ | WRITE);
 }
 
-static inline bool iov_iter_bvec_no_ref(const struct iov_iter *i)
-{
-        return (i->type & ITER_BVEC_FLAG_NO_REF) != 0;
-}
-
 /*
  * Total number of bytes covered by an iovec.
  *