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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Richard Weinberger <richard@nod.at>,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	Geoff Levand <geoff@infradead.org>,
	Ilya Dryomov <idryomov@gmail.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Stefan Hajnoczi <stefanha@redhat.com>, Song Liu <song@kernel.org>,
	Mike Snitzer <snitzer@redhat.com>, Coly Li <colyli@suse.de>,
	Stefan Haberland <sth@linux.ibm.com>,
	Jan Hoeppner <hoeppner@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Phillip Lougher <phillip@squashfs.org.uk>,
	linux-block@vger.kernel.org, dm-devel@redhat.com,
	linux-um@lists.infradead.org, ceph-devel@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org,
	linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org,
	linux-scsi@vger.kernel.org
Subject: [PATCH 01/15] bvec: add a bvec_virt helper
Date: Wed,  4 Aug 2021 11:56:20 +0200	[thread overview]
Message-ID: <20210804095634.460779-2-hch@lst.de> (raw)
In-Reply-To: <20210804095634.460779-1-hch@lst.de>

Add a helper to get the virtual address for a bvec.  This avoids that
all callers need to know about the page + offset representation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/bvec.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index f9fa43b940ff..0e9bdd42dafb 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -229,4 +229,16 @@ static inline void memzero_bvec(struct bio_vec *bvec)
 	memzero_page(bvec->bv_page, bvec->bv_offset, bvec->bv_len);
 }
 
+/**
+ * bvec_virt - return the virtual address for a bvec
+ * @bvec: bvec to return the virtual address for
+ *
+ * Note: the caller must ensure that @bvec->bv_page is not a highmem page.
+ */
+static inline void *bvec_virt(struct bio_vec *bvec)
+{
+	WARN_ON_ONCE(PageHighMem(bvec->bv_page));
+	return page_address(bvec->bv_page) + bvec->bv_offset;
+}
+
 #endif /* __LINUX_BVEC_H */
-- 
2.30.2


  reply	other threads:[~2021-08-04  9:59 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04  9:56 Christoph Hellwig
2021-08-04  9:56 ` Christoph Hellwig [this message]
2021-08-05  6:19   ` [PATCH 01/15] bvec: " Chaitanya Kulkarni
2021-08-06  2:38   ` Martin K. Petersen
2021-08-04  9:56 ` [PATCH 02/15] block: use bvec_virt in bio_integrity_{process,free} Christoph Hellwig
2021-08-05  6:19   ` Chaitanya Kulkarni
2021-08-06  2:38   ` Martin K. Petersen
2021-08-04  9:56 ` [PATCH 03/15] dm: make EBS depend on !HIGHMEM Christoph Hellwig
2021-08-04  9:56 ` [PATCH 04/15] dm-ebs: use bvec_virt Christoph Hellwig
2021-08-04  9:56 ` [PATCH 05/15] dm-integrity: " Christoph Hellwig
2021-08-04  9:56 ` [PATCH 06/15] squashfs: " Christoph Hellwig
2021-08-04  9:56 ` [PATCH 07/15] rbd: " Christoph Hellwig
2021-08-05 12:01   ` Jeff Layton
2021-08-04  9:56 ` [PATCH 08/15] virtio_blk: " Christoph Hellwig
2021-08-05 14:17   ` Stefan Hajnoczi
2021-08-04  9:56 ` [PATCH 09/15] bcache: " Christoph Hellwig
2021-08-04 17:05   ` Coly Li
2021-08-04  9:56 ` [PATCH 10/15] sd: " Christoph Hellwig
2021-08-05 16:31   ` [dm-devel] " Bart Van Assche
2021-08-06  2:43   ` Martin K. Petersen
2021-08-04  9:56 ` [PATCH 11/15] ubd: " Christoph Hellwig
2021-08-04 10:10   ` Anton Ivanov
2021-08-04  9:56 ` [PATCH 12/15] ps3vram: " Christoph Hellwig
2021-08-04  9:56 ` [PATCH 13/15] dasd: " Christoph Hellwig
2021-08-04 20:20   ` Stefan Haberland
2021-08-04  9:56 ` [PATCH 14/15] dcssblk: " Christoph Hellwig
2021-08-04  9:56 ` [PATCH 15/15] nvme: " Christoph Hellwig
2021-08-04 14:33   ` Keith Busch
2021-08-16 12:38 ` add a bvec_virt helper Christoph Hellwig
2021-08-16 16:51 ` Jens Axboe

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