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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Coly Li <colyli@suse.de>, Mike Snitzer <snitzer@redhat.com>,
	Song Liu <song@kernel.org>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Josef Bacik <josef@toxicpanda.com>,
	David Sterba <dsterba@suse.com>,
	Phillip Lougher <phillip@squashfs.org.uk>,
	linux-block@vger.kernel.org, dm-devel@redhat.com,
	linux-kernel@vger.kernel.org, linux-bcache@vger.kernel.org,
	linux-raid@vger.kernel.org, target-devel@vger.kernel.org,
	linux-btrfs@vger.kernel.org
Subject: [PATCH 1/5] btrfs: simplify ->flush_bio handling
Date: Tue,  8 Mar 2022 07:15:47 +0100	[thread overview]
Message-ID: <20220308061551.737853-2-hch@lst.de> (raw)
In-Reply-To: <20220308061551.737853-1-hch@lst.de>

Use and embedded bios that is initialized when used instead of
bio_kmalloc plus bio_reset.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/disk-io.c |  8 +++++---
 fs/btrfs/volumes.c | 11 -----------
 fs/btrfs/volumes.h |  4 ++--
 3 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 505ba21230b1f..7d4229c769ac6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4127,6 +4127,7 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
  */
 static void btrfs_end_empty_barrier(struct bio *bio)
 {
+	bio_uninit(bio);
 	complete(bio->bi_private);
 }
 
@@ -4136,7 +4137,7 @@ static void btrfs_end_empty_barrier(struct bio *bio)
  */
 static void write_dev_flush(struct btrfs_device *device)
 {
-	struct bio *bio = device->flush_bio;
+	struct bio *bio = &device->flush_bio;
 
 #ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 	/*
@@ -4154,7 +4155,8 @@ static void write_dev_flush(struct btrfs_device *device)
 		return;
 #endif
 
-	bio_reset(bio, device->bdev, REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
+	bio_init(bio, device->bdev, NULL, 0,
+		 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
 	bio->bi_end_io = btrfs_end_empty_barrier;
 	init_completion(&device->flush_wait);
 	bio->bi_private = &device->flush_wait;
@@ -4168,7 +4170,7 @@ static void write_dev_flush(struct btrfs_device *device)
  */
 static blk_status_t wait_dev_flush(struct btrfs_device *device)
 {
-	struct bio *bio = device->flush_bio;
+	struct bio *bio = &device->flush_bio;
 
 	if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
 		return BLK_STS_OK;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b07d382d53a86..7015b3096f724 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -405,7 +405,6 @@ void btrfs_free_device(struct btrfs_device *device)
 	WARN_ON(!list_empty(&device->post_commit_list));
 	rcu_string_free(device->name);
 	extent_io_tree_release(&device->alloc_state);
-	bio_put(device->flush_bio);
 	btrfs_destroy_dev_zone_info(device);
 	kfree(device);
 }
@@ -6962,16 +6961,6 @@ struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
 	if (!dev)
 		return ERR_PTR(-ENOMEM);
 
-	/*
-	 * Preallocate a bio that's always going to be used for flushing device
-	 * barriers and matches the device lifespan
-	 */
-	dev->flush_bio = bio_kmalloc(GFP_KERNEL, 0);
-	if (!dev->flush_bio) {
-		kfree(dev);
-		return ERR_PTR(-ENOMEM);
-	}
-
 	INIT_LIST_HEAD(&dev->dev_list);
 	INIT_LIST_HEAD(&dev->dev_alloc_list);
 	INIT_LIST_HEAD(&dev->post_commit_list);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 005c9e2a491a1..dbd6cc5e5cd3b 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -116,8 +116,8 @@ struct btrfs_device {
 	/* bytes used on the current transaction */
 	u64 commit_bytes_used;
 
-	/* for sending down flush barriers */
-	struct bio *flush_bio;
+	/* Bio used for flushing device barriers */
+	struct bio flush_bio;
 	struct completion flush_wait;
 
 	/* per-device scrub information */
-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org,
	Mike Snitzer <snitzer@redhat.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	linux-kernel@vger.kernel.org, Josef Bacik <josef@toxicpanda.com>,
	Coly Li <colyli@suse.de>,
	linux-block@vger.kernel.org, Song Liu <song@kernel.org>,
	dm-devel@redhat.com, target-devel@vger.kernel.org,
	David Sterba <dsterba@suse.com>,
	Phillip Lougher <phillip@squashfs.org.uk>,
	linux-btrfs@vger.kernel.org
Subject: [dm-devel] [PATCH 1/5] btrfs: simplify ->flush_bio handling
Date: Tue,  8 Mar 2022 07:15:47 +0100	[thread overview]
Message-ID: <20220308061551.737853-2-hch@lst.de> (raw)
In-Reply-To: <20220308061551.737853-1-hch@lst.de>

Use and embedded bios that is initialized when used instead of
bio_kmalloc plus bio_reset.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/disk-io.c |  8 +++++---
 fs/btrfs/volumes.c | 11 -----------
 fs/btrfs/volumes.h |  4 ++--
 3 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 505ba21230b1f..7d4229c769ac6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4127,6 +4127,7 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
  */
 static void btrfs_end_empty_barrier(struct bio *bio)
 {
+	bio_uninit(bio);
 	complete(bio->bi_private);
 }
 
@@ -4136,7 +4137,7 @@ static void btrfs_end_empty_barrier(struct bio *bio)
  */
 static void write_dev_flush(struct btrfs_device *device)
 {
-	struct bio *bio = device->flush_bio;
+	struct bio *bio = &device->flush_bio;
 
 #ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 	/*
@@ -4154,7 +4155,8 @@ static void write_dev_flush(struct btrfs_device *device)
 		return;
 #endif
 
-	bio_reset(bio, device->bdev, REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
+	bio_init(bio, device->bdev, NULL, 0,
+		 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
 	bio->bi_end_io = btrfs_end_empty_barrier;
 	init_completion(&device->flush_wait);
 	bio->bi_private = &device->flush_wait;
@@ -4168,7 +4170,7 @@ static void write_dev_flush(struct btrfs_device *device)
  */
 static blk_status_t wait_dev_flush(struct btrfs_device *device)
 {
-	struct bio *bio = device->flush_bio;
+	struct bio *bio = &device->flush_bio;
 
 	if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
 		return BLK_STS_OK;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b07d382d53a86..7015b3096f724 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -405,7 +405,6 @@ void btrfs_free_device(struct btrfs_device *device)
 	WARN_ON(!list_empty(&device->post_commit_list));
 	rcu_string_free(device->name);
 	extent_io_tree_release(&device->alloc_state);
-	bio_put(device->flush_bio);
 	btrfs_destroy_dev_zone_info(device);
 	kfree(device);
 }
@@ -6962,16 +6961,6 @@ struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
 	if (!dev)
 		return ERR_PTR(-ENOMEM);
 
-	/*
-	 * Preallocate a bio that's always going to be used for flushing device
-	 * barriers and matches the device lifespan
-	 */
-	dev->flush_bio = bio_kmalloc(GFP_KERNEL, 0);
-	if (!dev->flush_bio) {
-		kfree(dev);
-		return ERR_PTR(-ENOMEM);
-	}
-
 	INIT_LIST_HEAD(&dev->dev_list);
 	INIT_LIST_HEAD(&dev->dev_alloc_list);
 	INIT_LIST_HEAD(&dev->post_commit_list);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 005c9e2a491a1..dbd6cc5e5cd3b 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -116,8 +116,8 @@ struct btrfs_device {
 	/* bytes used on the current transaction */
 	u64 commit_bytes_used;
 
-	/* for sending down flush barriers */
-	struct bio *flush_bio;
+	/* Bio used for flushing device barriers */
+	struct bio flush_bio;
 	struct completion flush_wait;
 
 	/* per-device scrub information */
-- 
2.30.2

--
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dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel


  reply	other threads:[~2022-03-08  6:16 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-08  6:15 cleanup bio_kmalloc v2 Christoph Hellwig
2022-03-08  6:15 ` [dm-devel] " Christoph Hellwig
2022-03-08  6:15 ` Christoph Hellwig [this message]
2022-03-08  6:15   ` [dm-devel] [PATCH 1/5] btrfs: simplify ->flush_bio handling Christoph Hellwig
2022-03-08 22:07   ` Chaitanya Kulkarni
2022-03-08 22:07     ` [dm-devel] " Chaitanya Kulkarni
2022-03-08  6:15 ` [PATCH 2/5] squashfs: always use bio_kmalloc in squashfs_bio_read Christoph Hellwig
2022-03-08  6:15   ` [dm-devel] " Christoph Hellwig
2022-03-08  6:15 ` [PATCH 3/5] target/pscsi: remove pscsi_get_bio Christoph Hellwig
2022-03-08  6:15   ` [dm-devel] " Christoph Hellwig
2022-03-08 22:08   ` Chaitanya Kulkarni
2022-03-08 22:08     ` [dm-devel] " Chaitanya Kulkarni
2022-03-08  6:15 ` [PATCH 4/5] block: turn bio_kmalloc into a simple kmalloc wrapper Christoph Hellwig
2022-03-08  6:15   ` [dm-devel] " Christoph Hellwig
2022-03-09  3:06   ` Martin K. Petersen
2022-03-09  3:06     ` [dm-devel] " Martin K. Petersen
     [not found]   ` <CGME20220331211804eucas1p28da21f2dfd57aa490abffb8f87417f42@eucas1p2.samsung.com>
2022-03-31 21:18     ` Marek Szyprowski
2022-03-31 21:18       ` [dm-devel] " Marek Szyprowski
2022-03-31 21:22       ` Jens Axboe
2022-03-31 21:22         ` [dm-devel] " Jens Axboe
2022-04-01  4:57       ` Christoph Hellwig
2022-04-01  4:57         ` Christoph Hellwig
2022-03-08  6:15 ` [PATCH 5/5] pktcdvd: stop using bio_reset Christoph Hellwig
2022-03-08  6:15   ` [dm-devel] " Christoph Hellwig
2022-03-08 22:10   ` Chaitanya Kulkarni
2022-03-08 22:10     ` [dm-devel] " Chaitanya Kulkarni
2022-03-30 14:29 ` cleanup bio_kmalloc v2 Christoph Hellwig
2022-03-30 14:29   ` [dm-devel] " Christoph Hellwig
2022-03-30 14:37   ` Jens Axboe
2022-03-30 14:37     ` [dm-devel] " Jens Axboe
2022-03-30 14:49 ` Jens Axboe
2022-03-30 14:49   ` [dm-devel] " Jens Axboe
2022-03-31 16:34 ` Qian Cai
2022-03-31 16:34   ` [dm-devel] " Qian Cai
2022-03-31 16:40   ` Christoph Hellwig
2022-03-31 16:40     ` [dm-devel] " Christoph Hellwig
2022-03-31 16:48     ` Jens Axboe
2022-03-31 16:48       ` [dm-devel] " Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2022-04-06  6:12 [dm-devel] cleanup bio_kmalloc v3 Christoph Hellwig
2022-04-06  6:12 ` [PATCH 1/5] btrfs: simplify ->flush_bio handling Christoph Hellwig
2022-04-06 16:23   ` Chaitanya Kulkarni
2022-03-01  8:45 cleanup bio_kmalloc Christoph Hellwig
2022-03-01  8:45 ` [PATCH 1/5] btrfs: simplify ->flush_bio handling Christoph Hellwig
2022-03-01 14:22   ` David Sterba

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