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Date: Tue, 8 Aug 2017 16:45:04 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
Huang Ying <ying.huang@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
Ming Lei <ming.lei@...hat.com>
Subject: [PATCH v3 05/49] fs/buffer: comment on direct access to bvec table
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
fs/buffer.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 5715dac7821f..c821ed6a6f0e 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3054,8 +3054,13 @@ static void end_bio_bh_io_sync(struct bio *bio)
void guard_bio_eod(int op, struct bio *bio)
{
sector_t maxsector;
- struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
unsigned truncated_bytes;
+ /*
+ * It is safe to truncate the last bvec in the following way
+ * even though multipage bvec is supported, but we need to
+ * fix the parameters passed to zero_user().
+ */
+ struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9;
if (!maxsector)
--
2.9.4
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