From patchwork Wed Sep 11 20:12:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 13801042 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9EA821BB68A for ; Wed, 11 Sep 2024 20:12:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726085579; cv=none; b=QnydxS7KmYLc15zLMGqh714tClGdgxCxTsE6+VfLYtvszon6odZ/8MNa4st9rY/u/t1JeVZh7iJZ2TFkmLZaeSqvQ0b0ZZ9RAQJKXZCovvu48v6SU0tQS37Ns1zrbQXC33GzUHE1xKX9tEuaXxE7XvPUjswlTLTeKrvm8PoeLMQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726085579; c=relaxed/simple; bh=+PxqwvKQOdT226UPkI94Z24P05vd+OAdFhcR7k3fUg4=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=WtQi7CzZ40T6OiNDZjYgFjJMsKgFODSwAfD7kfTVI8eP73b/oIemjtO3C+pJglOV7oy2QeKlHnCFVjqeAhV6wbQC5a9JRO+JO577YMJtxAINf9Y7GILaP87lhssDVU9lQv8JIYEwZ5TqjCXzjinxbM5Rw9nTZwKjzlEdr8QqxFs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=MLJOpA0E; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="MLJOpA0E" Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.18.1.2/8.18.1.2) with ESMTP id 48BHjWcG004157 for ; Wed, 11 Sep 2024 13:12:56 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= s2048-2021-q4; bh=vK7qovxoMZszHB6W/2udkY9+/U6Fab7VLQCU0PsTo08=; b= MLJOpA0EQF3BNWDwY6W/0omrS8KKiE7SoujZvNEnq+YxGy+pVaLzVMKSgjOj3J4X 6bKeN9j95lQ6YjYx7P8OrvHzWNo35yBn0q4dv00/c/OeAlG+hlUW7UXLy7mwt5pF xjbdbqL6NgYZkN76vUChu0ZU4imCWzyDBJoJyOZgTdun1lhXCINEC18aQxDJHk39 ZUZjFcCd0fzwi2dFy7NxJIHQsEOyy1r6jd1ipzyajdHxGLyVhPPfwe38VwB7i2oY KAODWJjmMsfCn8ZwxeQMoZKuWzxSBtl7dd7rjX1J2d4H8s/OGQcrC2HxA0e2fqpY GkI63qj9GW5CE39NqWYA+g== Received: from maileast.thefacebook.com ([163.114.130.16]) by m0001303.ppops.net (PPS) with ESMTPS id 41k44nnb2x-12 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 11 Sep 2024 13:12:56 -0700 (PDT) Received: from twshared4354.35.frc1.facebook.com (2620:10d:c0a8:fe::f072) by mail.thefacebook.com (2620:10d:c0a9:6f::8fd4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.1544.11; Wed, 11 Sep 2024 20:12:55 +0000 Received: by devbig638.nha1.facebook.com (Postfix, from userid 544533) id EAB7812E5EDAC; Wed, 11 Sep 2024 13:12:41 -0700 (PDT) From: Keith Busch To: , , , , , , CC: Keith Busch Subject: [PATCHv4 04/10] blk-integrity: consider entire bio list for merging Date: Wed, 11 Sep 2024 13:12:34 -0700 Message-ID: <20240911201240.3982856-5-kbusch@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20240911201240.3982856-1-kbusch@meta.com> References: <20240911201240.3982856-1-kbusch@meta.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: PyVUmUxlcJQNur5cIxFii6MDrqFCCehR X-Proofpoint-GUID: PyVUmUxlcJQNur5cIxFii6MDrqFCCehR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-11_01,2024-09-09_02,2024-09-02_01 From: Keith Busch If a bio is merged to a request, the entire bio list is merged, so don't temporarily detach it from its list when counting segments. In most cases, bi_next will already be NULL, so detaching is usually a no-op. But if the bio does have a list, the current code is miscounting the segments for the resulting merge. Signed-off-by: Keith Busch --- block/blk-integrity.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/block/blk-integrity.c b/block/blk-integrity.c index afd101555d3cb..84065691aaed0 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -134,7 +134,6 @@ bool blk_integrity_merge_bio(struct request_queue *q, struct request *req, struct bio *bio) { int nr_integrity_segs; - struct bio *next = bio->bi_next; if (blk_integrity_rq(req) == 0 && bio_integrity(bio) == NULL) return true; @@ -145,10 +144,7 @@ bool blk_integrity_merge_bio(struct request_queue *q, struct request *req, if (bio_integrity(req->bio)->bip_flags != bio_integrity(bio)->bip_flags) return false; - bio->bi_next = NULL; nr_integrity_segs = blk_rq_count_integrity_sg(q, bio); - bio->bi_next = next; - if (req->nr_integrity_segments + nr_integrity_segs > q->limits.max_integrity_segments) return false;