From mboxrd@z Thu Jan 1 00:00:00 1970
Return-Path: <io-uring-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
by smtp.lore.kernel.org (Postfix) with ESMTP id 62CA4C32774
for <io-uring@archiver.kernel.org>; Fri, 19 Aug 2022 10:40:57 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
id S1348443AbiHSKk4 (ORCPT <rfc822;io-uring@archiver.kernel.org>);
Fri, 19 Aug 2022 06:40:56 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34982 "EHLO
lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
with ESMTP id S1348446AbiHSKkv (ORCPT
<rfc822;io-uring@vger.kernel.org>); Fri, 19 Aug 2022 06:40:51 -0400
Received: from mailout3.samsung.com (mailout3.samsung.com [203.254.224.33])
by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E34ACF43B1
for <io-uring@vger.kernel.org>; Fri, 19 Aug 2022 03:40:50 -0700 (PDT)
Received: from epcas5p4.samsung.com (unknown [182.195.41.42])
by mailout3.samsung.com (KnoxPortal) with ESMTP id 20220819104049epoutp0390536bc7fa39bd29a7d02e7814ec897a~MuONk-kPC1596215962epoutp03v
for <io-uring@vger.kernel.org>; Fri, 19 Aug 2022 10:40:49 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 mailout3.samsung.com 20220819104049epoutp0390536bc7fa39bd29a7d02e7814ec897a~MuONk-kPC1596215962epoutp03v
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com;
s=mail20170921; t=1660905649;
bh=tzGYFtcZm58+i7gZlKId0iWHEtzko0JqMTEVRvMBpzw=;
h=From:To:Cc:Subject:Date:In-Reply-To:References:From;
b=Rtycfx26PR5oZLJLtSuSjplNsUqu1psetw6EScllqWVn7Ia2aN7Vo8igZEydNqZpw
aKoxDP/U3lm0cjQowsv3bOyocgCTIPIm4NsYk6v2Q+e+ygxqS4A1gjuTyG967wjqro
2F90q/XmsTMsaSPoOzIwFk/u2nv/uDuSylWUw0EU=
Received: from epsnrtp4.localdomain (unknown [182.195.42.165]) by
epcas5p1.samsung.com (KnoxPortal) with ESMTP id
20220819104049epcas5p19ed8c5a3cdb95ec6cd0fc9f22e6abcb5~MuONOiVE30663706637epcas5p1t;
Fri, 19 Aug 2022 10:40:49 +0000 (GMT)
Received: from epsmges5p1new.samsung.com (unknown [182.195.38.175]) by
epsnrtp4.localdomain (Postfix) with ESMTP id 4M8JF95dJxz4x9Px; Fri, 19 Aug
2022 10:40:45 +0000 (GMT)
Received: from epcas5p4.samsung.com ( [182.195.41.42]) by
epsmges5p1new.samsung.com (Symantec Messaging Gateway) with SMTP id
0B.E3.49477.AA86FF26; Fri, 19 Aug 2022 19:40:42 +0900 (KST)
Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by
epcas5p1.samsung.com (KnoxPortal) with ESMTPA id
20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c~MuOHCpSKa0652106521epcas5p1v;
Fri, 19 Aug 2022 10:40:42 +0000 (GMT)
Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by
epsmtrp1.samsung.com (KnoxPortal) with ESMTP id
20220819104042epsmtrp1ad49f1f504746d22c6b0f7358e4b0c0a~MuOHB57cr1513515135epsmtrp1I;
Fri, 19 Aug 2022 10:40:42 +0000 (GMT)
X-AuditID: b6c32a49-82dff7000000c145-83-62ff68aa7b76
Received: from epsmtip1.samsung.com ( [182.195.34.30]) by
epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id
D9.85.08802.AA86FF26; Fri, 19 Aug 2022 19:40:42 +0900 (KST)
Received: from localhost.localdomain (unknown [107.110.206.5]) by
epsmtip1.samsung.com (KnoxPortal) with ESMTPA id
20220819104040epsmtip1bd7bae4cb87fe4a4ae49f8560660bba2~MuOE-h6LQ0577205772epsmtip1i;
Fri, 19 Aug 2022 10:40:39 +0000 (GMT)
From: Kanchan Joshi <joshi.k@samsung.com>
To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org
Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, ming.lei@redhat.com,
gost.dev@samsung.com, Kanchan Joshi <joshi.k@samsung.com>,
Anuj Gupta <anuj20.g@samsung.com>
Subject: [PATCH for-next 3/4] block: add helper to map bvec iterator for
passthrough
Date: Fri, 19 Aug 2022 16:00:20 +0530
Message-Id: <20220819103021.240340-4-joshi.k@samsung.com>
X-Mailer: git-send-email 2.25.1
In-Reply-To: <20220819103021.240340-1-joshi.k@samsung.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprFJsWRmVeSWpSXmKPExsWy7bCmlu6qjP9JBs33LSyaJvxltlh9t5/N
4uaBnUwWK1cfZbJ413qOxeLo/7dsFpMOXWO02HtL22L+sqfsFocmNzM5cHlcPlvqsWlVJ5vH
5iX1HrtvNrB5vN93lc2jb8sqRo/Pm+QC2KOybTJSE1NSixRS85LzUzLz0m2VvIPjneNNzQwM
dQ0tLcyVFPISc1NtlVx8AnTdMnOAjlNSKEvMKQUKBSQWFyvp29kU5ZeWpCpk5BeX2CqlFqTk
FJgU6BUn5haX5qXr5aWWWBkaGBiZAhUmZGdceH2ZvWC1ZMWTW71sDYyTRLoYOTkkBEwkPh3c
zNTFyMUhJLCbUaJly1k2COcTo8TjG7vYIZzPjBKbj65ig2mZdm0zI0RiF6PEprXzWOGqfl98
z9zFyMHBJqApcWFyKUiDiICRxP5PJ8FqmAUuMErc23mTBSQhLBAm8Wf3FkYQm0VAVeLF3tVg
Nq+ApcSqbe+gtslLzLz0nR3E5hSwkpi19CobRI2gxMmZT8DmMAPVNG+dzQyyQEKgk0Ni9/YX
LBDNLhJzNrewQtjCEq+Ob2GHsKUkXva3QdnJEpdmnmOCsEskHu85CGXbS7Se6gd7hhnomfW7
9CF28Un0/n7CBBKWEOCV6GgTgqhWlLg36SnUJnGJhzOWQNkeEle7VkCDtJdR4sbUHewTGOVn
IXlhFpIXZiFsW8DIvIpRMrWgODc9tdi0wDAvtRwes8n5uZsYwYlUy3MH490HH/QOMTJxMB5i
lOBgVhLhvXHnT5IQb0piZVVqUX58UWlOavEhRlNgGE9klhJNzgem8rySeEMTSwMTMzMzE0tj
M0MlcV6vq5uShATSE0tSs1NTC1KLYPqYODilGpg4e1+tOWU15+nqpb/Yao+6/k02lI9sYl3y
pLRKTH2iFeOUlnhr520c652srJxZhJrmuXj4fD9evH/1+p01h66qnOVrTReMf5/ffro04oXJ
WYFOtg09BkGpBusOOK8Tczi6vvfpsf/rn/pcnuzi1Pudc1+TfdizEGa1uieF02+luHDcPfb3
8stC/UbGOrl9sz9ZMBzYeS9vka7y5UcPlzT8c5z08t9/S0lR0V/LZz4Ik8lxlDt64031st25
c6P0b6obtZ846B70M7IqKXKWp0dsfbliCJtc79LdGlJa3tZLNDYdON3QdnDJkcQVSyd6KR64
tSuPbfKFKNXZEjXFCw8u+db2KNwyJJ/xlN4x5ntKLMUZiYZazEXFiQBqWBkSLQQAAA==
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrLLMWRmVeSWpSXmKPExsWy7bCSnO6qjP9JBv8f8Fs0TfjLbLH6bj+b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X-CMS-MailID: 20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c
X-Msg-Generator: CA
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 105P
DLP-Filter: Pass
X-CFilter-Loop: Reflected
X-CMS-RootMailID: 20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c
References: <20220819103021.240340-1-joshi.k@samsung.com>
<CGME20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c@epcas5p1.samsung.com>
Precedence: bulk
List-ID: <io-uring.vger.kernel.org>
X-Mailing-List: io-uring@vger.kernel.org
Add blk_rq_map_user_fixedb which maps the bvec iterator into a bio and
places that into the request.
This helper is to be used in nvme for uring-passthrough with
fixed-buffer.
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
---
block/blk-map.c | 71 ++++++++++++++++++++++++++++++++++++++++++
include/linux/blk-mq.h | 1 +
2 files changed, 72 insertions(+)
diff --git a/block/blk-map.c b/block/blk-map.c
index d0ff80a9902e..ee17cc78bf00 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -611,6 +611,77 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
}
EXPORT_SYMBOL(blk_rq_map_user);
+/* Prepare bio for passthrough IO given an existing bvec iter */
+int blk_rq_map_user_bvec(struct request *rq, struct iov_iter *iter)
+{
+ struct request_queue *q = rq->q;
+ size_t iter_count, nr_segs;
+ struct bio *bio;
+ struct bio_vec *bv, *bvec_arr, *bvprvp = NULL;
+ struct queue_limits *lim = &q->limits;
+ unsigned int nsegs = 0, bytes = 0;
+ int ret, i;
+
+ iter_count = iov_iter_count(iter);
+ nr_segs = iter->nr_segs;
+
+ if (!iter_count || (iter_count >> 9) > queue_max_hw_sectors(q))
+ return -EINVAL;
+ if (nr_segs > queue_max_segments(q))
+ return -EINVAL;
+ if (rq->cmd_flags & REQ_POLLED) {
+ blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE;
+
+ /* no iovecs to alloc, as we already have a BVEC iterator */
+ bio = bio_alloc_bioset(NULL, 0, opf, GFP_KERNEL,
+ &fs_bio_set);
+ if (!bio)
+ return -ENOMEM;
+ } else {
+ bio = bio_kmalloc(0, GFP_KERNEL);
+ if (!bio)
+ return -ENOMEM;
+ bio_init(bio, NULL, bio->bi_inline_vecs, 0, req_op(rq));
+ }
+ bio_iov_bvec_set(bio, iter);
+ blk_rq_bio_prep(rq, bio, nr_segs);
+
+ /* loop to perform a bunch of sanity checks */
+ bvec_arr = (struct bio_vec *)iter->bvec;
+ for (i = 0; i < nr_segs; i++) {
+ bv = &bvec_arr[i];
+ /*
+ * If the queue doesn't support SG gaps and adding this
+ * offset would create a gap, disallow it.
+ */
+ if (bvprvp && bvec_gap_to_prev(lim, bvprvp, bv->bv_offset)) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ /* check full condition */
+ if (nsegs >= nr_segs || bytes > UINT_MAX - bv->bv_len) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ if (bytes + bv->bv_len <= iter_count &&
+ bv->bv_offset + bv->bv_len <= PAGE_SIZE) {
+ nsegs++;
+ bytes += bv->bv_len;
+ } else {
+ ret = -EINVAL;
+ goto out_free;
+ }
+ bvprvp = bv;
+ }
+ return 0;
+out_free:
+ bio_map_put(bio);
+ return ret;
+}
+EXPORT_SYMBOL(blk_rq_map_user_bvec);
+
/**
* blk_rq_unmap_user - unmap a request with user data
* @bio: start of bio list
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 9d1af7a0a401..a7c9c836d2f3 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -971,6 +971,7 @@ struct rq_map_data {
bool from_user;
};
+int blk_rq_map_user_fixedb(struct request *rq, struct iov_iter *iter);
int blk_rq_map_user(struct request_queue *, struct request *,
struct rq_map_data *, void __user *, unsigned long, gfp_t);
int blk_rq_map_user_iov(struct request_queue *, struct request *,
--
2.25.1