From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from legacy.ddn.com ([64.47.133.206]:32442 "EHLO legacy.ddn.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751113AbdJXBQL (ORCPT ); Mon, 23 Oct 2017 21:16:11 -0400 From: Greg Edwards To: CC: Christoph Hellwig , Alexander Viro , , Greg Edwards Subject: [PATCH] fs: guard_bio_eod() needs to consider partitions Date: Mon, 23 Oct 2017 19:10:07 -0600 Message-ID: <20171024011007.24855-1-gedwards@ddn.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-fsdevel-owner@vger.kernel.org List-ID: guard_bio_eod() needs to look at the partition capacity, not just the capacity of the whole device, when determining if truncation is necessary. [ 60.268688] attempt to access beyond end of device [ 60.268690] unknown-block(9,1): rw=0, want=67103509, limit=67103506 [ 60.268693] buffer_io_error: 2 callbacks suppressed [ 60.268696] Buffer I/O error on dev md1p7, logical block 4524305, async page read Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index") Signed-off-by: Greg Edwards --- fs/buffer.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 170df856bdb9..989d3b085efe 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3055,8 +3055,15 @@ 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; + struct hd_struct *part; + + part = disk_get_part(bio->bi_disk, bio->bi_partno); + if (part) + maxsector = part_nr_sects_read(part); + else + maxsector = get_capacity(bio->bi_disk); + disk_put_part(part); - maxsector = get_capacity(bio->bi_disk); if (!maxsector) return; -- 2.13.6