| From | Ming Lei <> | Subject | [PATCH V10 06/19] fs/buffer.c: use bvec iterator to truncate the bio | Date | Thu, 15 Nov 2018 16:52:53 +0800 |
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Once multi-page bvec is enabled, the last bvec may include more than one page, this patch use bvec_last_segment() to truncate the bio.
Cc: Dave Chinner <dchinner@redhat.com> Cc: Kent Overstreet <kent.overstreet@gmail.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: dm-devel@redhat.com Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Cc: Shaohua Li <shli@kernel.org> Cc: linux-raid@vger.kernel.org Cc: linux-erofs@lists.ozlabs.org Cc: David Sterba <dsterba@suse.com> Cc: linux-btrfs@vger.kernel.org Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: linux-xfs@vger.kernel.org Cc: Gao Xiang <gaoxiang25@huawei.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Theodore Ts'o <tytso@mit.edu> Cc: linux-ext4@vger.kernel.org Cc: Coly Li <colyli@suse.de> Cc: linux-bcache@vger.kernel.org Cc: Boaz Harrosh <ooo@electrozaur.com> Cc: Bob Peterson <rpeterso@redhat.com> Cc: cluster-devel@redhat.com Signed-off-by: Ming Lei <ming.lei@redhat.com> --- fs/buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c index 1286c2b95498..fa37ad52e962 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3032,7 +3032,10 @@ void guard_bio_eod(int op, struct bio *bio) /* ..and clear the end of the buffer for reads */ if (op == REQ_OP_READ) { - zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len, + struct bio_vec bv; + + bvec_last_segment(bvec, &bv); + zero_user(bv.bv_page, bv.bv_offset + bv.bv_len, truncated_bytes); } } -- 2.9.5
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