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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>, Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Geoff Levand <geoff@infradead.org>,
	Ilya Dryomov <idryomov@gmail.com>,
	Dongsheng Yang <dongsheng.yang@easystack.cn>,
	Mike Snitzer <snitzer@redhat.com>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Ira Weiny <ira.weiny@intel.com>,
	dm-devel@redhat.com, linux-mips@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, ceph-devel@vger.kernel.org,
	linux-arch@vger.kernel.org,
	"Martin K . Petersen" <martin.petersen@oracle.com>
Subject: [PATCH 07/15] dm-writecache: use bvec_kmap_local instead of bvec_kmap_irq
Date: Tue, 27 Jul 2021 07:56:38 +0200	[thread overview]
Message-ID: <20210727055646.118787-8-hch@lst.de> (raw)
In-Reply-To: <20210727055646.118787-1-hch@lst.de>

There is no need to disable interrupts in bio_copy_block, and the local
only mappings helps to avoid any sort of problems with stray writes
into the bio data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
---
 drivers/md/dm-writecache.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index e21e29e81bbf..3d2cf811ec3e 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -1214,14 +1214,13 @@ static void memcpy_flushcache_optimized(void *dest, void *source, size_t size)
 static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data)
 {
 	void *buf;
-	unsigned long flags;
 	unsigned size;
 	int rw = bio_data_dir(bio);
 	unsigned remaining_size = wc->block_size;
 
 	do {
 		struct bio_vec bv = bio_iter_iovec(bio, bio->bi_iter);
-		buf = bvec_kmap_irq(&bv, &flags);
+		buf = bvec_kmap_local(&bv);
 		size = bv.bv_len;
 		if (unlikely(size > remaining_size))
 			size = remaining_size;
@@ -1239,7 +1238,7 @@ static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data
 			memcpy_flushcache_optimized(data, buf, size);
 		}
 
-		bvec_kunmap_irq(buf, &flags);
+		kunmap_local(buf);
 
 		data = (char *)data + size;
 		remaining_size -= size;
-- 
2.30.2


  parent reply	other threads:[~2021-07-27  6:10 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27  5:56 switch the block layer to use kmap_local_page v3 Christoph Hellwig
2021-07-27  5:56 ` [PATCH 01/15] MIPS: don't include <linux/genhd.h> in <asm/mach-rc32434/rb.h> Christoph Hellwig
2021-07-27  5:56 ` [PATCH 02/15] bvec: fix the include guards for bvec.h Christoph Hellwig
2021-07-27  5:56 ` [PATCH 03/15] bvec: add a bvec_kmap_local helper Christoph Hellwig
2021-07-27  5:56 ` [PATCH 04/15] bvec: add memcpy_{from,to}_bvec and memzero_bvec helper Christoph Hellwig
2021-07-27  5:56 ` [PATCH 05/15] block: use memzero_page in zero_fill_bio Christoph Hellwig
2021-07-27  5:56 ` [PATCH 06/15] rbd: use memzero_bvec Christoph Hellwig
2021-07-27  5:56 ` Christoph Hellwig [this message]
2021-07-27  5:56 ` [PATCH 08/15] ps3disk: use memcpy_{from,to}_bvec Christoph Hellwig
2021-07-27  5:56 ` [PATCH 09/15] block: remove bvec_kmap_irq and bvec_kunmap_irq Christoph Hellwig
2021-07-27  5:56 ` [PATCH 10/15] block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec Christoph Hellwig
2021-07-27  5:56 ` [PATCH 11/15] block: use memcpy_to_bvec in copy_to_high_bio_irq Christoph Hellwig
2021-07-27  5:56 ` [PATCH 12/15] block: use memcpy_from_bvec in bio_copy_kern_endio_read Christoph Hellwig
2021-07-27  5:56 ` [PATCH 13/15] block: use memcpy_from_bvec in __blk_queue_bounce Christoph Hellwig
2021-07-27  5:56 ` [PATCH 14/15] block: use bvec_kmap_local in t10_pi_type1_{prepare,complete} Christoph Hellwig
2021-07-27  5:56 ` [PATCH 15/15] block: use bvec_kmap_local in bio_integrity_process Christoph Hellwig
2021-07-28  1:31 ` switch the block layer to use kmap_local_page v3 Jens Axboe

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