From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vyacheslav Dubeyko Subject: [PATCH v3 2/2] nilfs2: fix issue with counting number of bio requests for BIO_EOPNOTSUPP error detection Date: Tue, 13 Aug 2013 17:50:51 +0400 Message-ID: <1376401851.2274.10.camel@slavad-ubuntu> Reply-To: slava@dubeyko.com Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: DanCarpenter , linux-nilfs@vger.kernel.org, Linux FS Devel , kernel-janitors@vger.kernel.org, akpm@linux-foundation.org To: Ryusuke Konishi Return-path: Received: from oproxy5-pub.mail.unifiedlayer.com ([67.222.38.55]:34592 "HELO oproxy5-pub.mail.unifiedlayer.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1757136Ab3HMNu5 (ORCPT ); Tue, 13 Aug 2013 09:50:57 -0400 Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Vyacheslav Dubeyko Subject: [PATCH v3 2/2] nilfs2: fix issue with counting number of bio requests for BIO_EOPNOTSUPP error detection This patch fixes the issue with improper counting number of flying bio requests for BIO_EOPNOTSUPP error detection case. The sb_nbio must be incremented exactly the same number of times as complete() function was called (or will be called) because nilfs_segbuf_wait() will call wail_for_completion() for the number of times set to sb_nbio: do { wait_for_completion(&segbuf->sb_bio_event); } while (--segbuf->sb_nbio > 0); Two functions complete() and wait_for_completion() must be called the same number of times for the same sb_bio_event. Otherwise, wait_for_completion() will hang or leak. Signed-off-by: Vyacheslav Dubeyko CC: Ryusuke Konishi CC: Dan Carpenter --- fs/nilfs2/segbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c index 5bacf46..2d8be51 100644 --- a/fs/nilfs2/segbuf.c +++ b/fs/nilfs2/segbuf.c @@ -376,12 +376,12 @@ static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf, bio->bi_private = segbuf; bio_get(bio); submit_bio(mode, bio); + segbuf->sb_nbio++; if (bio_flagged(bio, BIO_EOPNOTSUPP)) { bio_put(bio); err = -EOPNOTSUPP; goto failed; } - segbuf->sb_nbio++; bio_put(bio); wi->bio = NULL; -- 1.7.9.5