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From: Keith Busch <kbusch@fb.com>
To: <linux-fsdevel@vger.kernel.org>, <linux-block@vger.kernel.org>,
	<linux-nvme@lists.infradead.org>
Cc: <axboe@kernel.dk>, Kernel Team <Kernel-team@fb.com>, <hch@lst.de>,
	<willy@infradead.org>, <sagi@grimberg.me>,
	Keith Busch <kbusch@kernel.org>
Subject: [PATCH 08/12] block: add bio number of vecs helper for partials
Date: Thu, 30 Jun 2022 13:42:08 -0700	[thread overview]
Message-ID: <20220630204212.1265638-9-kbusch@fb.com> (raw)
In-Reply-To: <20220630204212.1265638-1-kbusch@fb.com>

From: Keith Busch <kbusch@kernel.org>

Bit buckets get their own vector, so need to allocate enough to hold
both the preregistered bvecs and the bit buckets.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 include/linux/bio.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 992ee987f273..ded38accf009 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -452,6 +452,17 @@ static inline int bio_iov_vecs_to_alloc(struct iov_iter *iter, int max_segs)
 	return iov_iter_npages(iter, max_segs);
 }
 
+static inline int bio_iov_vecs_to_alloc_partial(struct iov_iter *iter,
+						int max_segs, bool trunc,
+						bool skip)
+{
+	if (skip || trunc)
+		return min(iov_iter_npages(iter, max_segs) + skip + trunc,
+			   max_segs);
+	else
+		return bio_iov_vecs_to_alloc(iter, max_segs);
+}
+
 struct request_queue;
 
 extern int submit_bio_wait(struct bio *bio);
-- 
2.30.2


  parent reply	other threads:[~2022-06-30 20:43 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-30 20:42 [PATCH 00/12] block: support for partial sector reads Keith Busch
2022-06-30 20:42 ` [PATCH 01/12] block: move direct io alignment check to common Keith Busch
2022-06-30 20:42 ` [PATCH 02/12] iomap: save copy of bdev for direct io Keith Busch
2022-06-30 20:42 ` [PATCH 03/12] iomap: get logical block size directly Keith Busch
2022-06-30 20:42 ` [PATCH 04/12] iomap: use common blkdev alignment check Keith Busch
2022-06-30 20:42 ` [PATCH 05/12] block: add bit bucket capabilities Keith Busch
2022-06-30 20:42 ` [PATCH 06/12] nvme: add support for bit buckets Keith Busch
2022-06-30 20:42 ` [PATCH 07/12] block: allow copying pre-registered bvecs Keith Busch
2022-07-01  2:40   ` Keith Busch
2022-06-30 20:42 ` Keith Busch [this message]
2022-06-30 20:42 ` [PATCH 09/12] block: add partial sector parameter helper Keith Busch
2022-06-30 20:42 ` [PATCH 10/12] block: add direct-io partial sector read support Keith Busch
2022-06-30 20:42 ` [PATCH 11/12] iomap: " Keith Busch
2022-06-30 20:42 ` [PATCH 12/12] block: export and document bit_bucket attribute Keith Busch

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