From 9b2e0016d04c6542ace0128eb82ecb3b10c97e43 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Sat, 9 Jan 2021 16:02:58 +0000
Subject: bvec/iter: disallow zero-length segment bvecs

zero-length bvec segments are allowed in general, but not handled by bio
and down the block layer so filtered out. This inconsistency may be
confusing and prevent from optimisations. As zero-length segments are
useless and places that were generating them are patched, declare them
not allowed.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 lib/iov_iter.c | 2 --
 1 file changed, 2 deletions(-)

(limited to 'lib/iov_iter.c')

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index a21e6a5792c5..6c597cdfcf5b 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -72,8 +72,6 @@
 	__start.bi_bvec_done = skip;			\
 	__start.bi_idx = 0;				\
 	for_each_bvec(__v, i->bvec, __bi, __start) {	\
-		if (!__v.bv_len)			\
-			continue;			\
 		(void)(STEP);				\
 	}						\
 }
-- 
cgit