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From: Naohiro Aota <naohiro.aota@wdc.com>
To: linux-btrfs@vger.kernel.org, David Sterba <dsterba@suse.com>
Cc: "Chris Mason" <clm@fb.com>, "Josef Bacik" <josef@toxicpanda.com>,
	"Qu Wenruo" <wqu@suse.com>, "Nikolay Borisov" <nborisov@suse.com>,
	linux-kernel@vger.kernel.org, "Hannes Reinecke" <hare@suse.com>,
	linux-fsdevel@vger.kernel.org,
	"Damien Le Moal" <damien.lemoal@wdc.com>,
	"Matias Bjørling" <mb@lightnvm.io>,
	"Johannes Thumshirn" <jthumshirn@suse.de>,
	"Bart Van Assche" <bvanassche@acm.org>,
	"Naohiro Aota" <naohiro.aota@wdc.com>
Subject: [PATCH 11/19] btrfs: introduce submit buffer
Date: Fri,  7 Jun 2019 22:10:17 +0900
Message-ID: <20190607131025.31996-12-naohiro.aota@wdc.com> (raw)
In-Reply-To: <20190607131025.31996-1-naohiro.aota@wdc.com>

Sequential allocation is not enough to maintain sequential delivery of
write IOs to the device. Various features (async compress, async checksum,
...) of btrfs affect ordering of the IOs. This patch introduces submit
buffer to sort WRITE bios belonging to a block group and sort them out
sequentially in increasing block address to achieve sequential write
sequences with __btrfs_map_bio().

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/ctree.h             |   3 +
 fs/btrfs/extent-tree.c       |   5 ++
 fs/btrfs/volumes.c           | 165 +++++++++++++++++++++++++++++++++--
 fs/btrfs/volumes.h           |   3 +
 include/trace/events/btrfs.h |  41 +++++++++
 5 files changed, 212 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f4bcd2a6ec12..ade6d8243962 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -718,6 +718,9 @@ struct btrfs_block_group_cache {
 	 */
 	enum btrfs_alloc_type alloc_type;
 	u64 alloc_offset;
+	struct mutex submit_lock;
+	u64 submit_offset;
+	struct bio_list submit_buffer;
 };
 
 /* delayed seq elem */
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ae2c895d08c4..ebdc7a6dbe01 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -124,6 +124,7 @@ void btrfs_put_block_group(struct btrfs_block_group_cache *cache)
 	if (atomic_dec_and_test(&cache->count)) {
 		WARN_ON(cache->pinned > 0);
 		WARN_ON(cache->reserved > 0);
+		WARN_ON(!bio_list_empty(&cache->submit_buffer));
 
 		/*
 		 * If not empty, someone is still holding mutex of
@@ -10511,6 +10512,8 @@ btrfs_get_block_group_alloc_offset(struct btrfs_block_group_cache *cache)
 		goto out;
 	}
 
+	cache->submit_offset = logical + cache->alloc_offset;
+
 out:
 	cache->alloc_type = alloc_type;
 	kfree(alloc_offsets);
@@ -10547,6 +10550,7 @@ btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info,
 
 	atomic_set(&cache->count, 1);
 	spin_lock_init(&cache->lock);
+	mutex_init(&cache->submit_lock);
 	init_rwsem(&cache->data_rwsem);
 	INIT_LIST_HEAD(&cache->list);
 	INIT_LIST_HEAD(&cache->cluster_list);
@@ -10554,6 +10558,7 @@ btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info,
 	INIT_LIST_HEAD(&cache->ro_list);
 	INIT_LIST_HEAD(&cache->dirty_list);
 	INIT_LIST_HEAD(&cache->io_list);
+	bio_list_init(&cache->submit_buffer);
 	btrfs_init_free_space_ctl(cache);
 	atomic_set(&cache->trimming, 0);
 	mutex_init(&cache->free_space_lock);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 52d0d458c0fd..26a64a53032f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -29,6 +29,11 @@
 #include "sysfs.h"
 #include "tree-checker.h"
 
+struct map_bio_data {
+	void *orig_bi_private;
+	int mirror_num;
+};
+
 const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 	[BTRFS_RAID_RAID10] = {
 		.sub_stripes	= 2,
@@ -523,6 +528,7 @@ static void requeue_list(struct btrfs_pending_bios *pending_bios,
 		pending_bios->tail = tail;
 }
 
+
 /*
  * we try to collect pending bios for a device so we don't get a large
  * number of procs sending bios down to the same device.  This greatly
@@ -606,6 +612,8 @@ static noinline void run_scheduled_bios(struct btrfs_device *device)
 	spin_unlock(&device->io_lock);
 
 	while (pending) {
+		struct btrfs_bio *bbio;
+		struct completion *sent = NULL;
 
 		rmb();
 		/* we want to work on both lists, but do more bios on the
@@ -643,7 +651,12 @@ static noinline void run_scheduled_bios(struct btrfs_device *device)
 			sync_pending = 0;
 		}
 
+		bbio = cur->bi_private;
+		if (bbio)
+			sent = bbio->sent;
 		btrfsic_submit_bio(cur);
+		if (sent)
+			complete(sent);
 		num_run++;
 		batch_run++;
 
@@ -5916,6 +5929,7 @@ static struct btrfs_bio *alloc_btrfs_bio(int total_stripes, int real_stripes)
 
 	atomic_set(&bbio->error, 0);
 	refcount_set(&bbio->refs, 1);
+	INIT_LIST_HEAD(&bbio->list);
 
 	return bbio;
 }
@@ -6730,7 +6744,7 @@ static void btrfs_end_bio(struct bio *bio)
  * the work struct is scheduled.
  */
 static noinline void btrfs_schedule_bio(struct btrfs_device *device,
-					struct bio *bio)
+					struct bio *bio, int need_seqwrite)
 {
 	struct btrfs_fs_info *fs_info = device->fs_info;
 	int should_queue = 1;
@@ -6738,7 +6752,12 @@ static noinline void btrfs_schedule_bio(struct btrfs_device *device,
 
 	/* don't bother with additional async steps for reads, right now */
 	if (bio_op(bio) == REQ_OP_READ) {
+		struct btrfs_bio *bbio = bio->bi_private;
+		struct completion *sent = bbio->sent;
+
 		btrfsic_submit_bio(bio);
+		if (sent)
+			complete(sent);
 		return;
 	}
 
@@ -6746,7 +6765,7 @@ static noinline void btrfs_schedule_bio(struct btrfs_device *device,
 	bio->bi_next = NULL;
 
 	spin_lock(&device->io_lock);
-	if (op_is_sync(bio->bi_opf))
+	if (op_is_sync(bio->bi_opf) && need_seqwrite == 0)
 		pending_bios = &device->pending_sync_bios;
 	else
 		pending_bios = &device->pending_bios;
@@ -6785,8 +6804,21 @@ static void submit_stripe_bio(struct btrfs_bio *bbio, struct bio *bio,
 
 	btrfs_bio_counter_inc_noblocked(fs_info);
 
+	/* queue all bios into scheduler if sequential write is required */
+	if (bbio->need_seqwrite) {
+		if (!async) {
+			DECLARE_COMPLETION_ONSTACK(sent);
+
+			bbio->sent = &sent;
+			btrfs_schedule_bio(dev, bio, bbio->need_seqwrite);
+			wait_for_completion_io(&sent);
+		} else {
+			btrfs_schedule_bio(dev, bio, bbio->need_seqwrite);
+		}
+		return;
+	}
 	if (async)
-		btrfs_schedule_bio(dev, bio);
+		btrfs_schedule_bio(dev, bio, bbio->need_seqwrite);
 	else
 		btrfsic_submit_bio(bio);
 }
@@ -6808,9 +6840,10 @@ static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
 	}
 }
 
+
 static blk_status_t __btrfs_map_bio(struct btrfs_fs_info *fs_info,
 				    struct bio *bio, int mirror_num,
-				    int async_submit)
+				    int async_submit, int need_seqwrite)
 {
 	struct btrfs_device *dev;
 	struct bio *first_bio = bio;
@@ -6838,6 +6871,7 @@ static blk_status_t __btrfs_map_bio(struct btrfs_fs_info *fs_info,
 	bbio->private = first_bio->bi_private;
 	bbio->end_io = first_bio->bi_end_io;
 	bbio->fs_info = fs_info;
+	bbio->need_seqwrite = need_seqwrite;
 	atomic_set(&bbio->stripes_pending, bbio->num_stripes);
 
 	if ((bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) &&
@@ -6885,10 +6919,131 @@ static blk_status_t __btrfs_map_bio(struct btrfs_fs_info *fs_info,
 	return BLK_STS_OK;
 }
 
+static blk_status_t __btrfs_map_bio_zoned(struct btrfs_fs_info *fs_info,
+					  struct bio *cur_bio, int mirror_num,
+					  int async_submit)
+{
+	u64 logical = (u64)cur_bio->bi_iter.bi_sector << SECTOR_SHIFT;
+	u64 length = cur_bio->bi_iter.bi_size;
+	struct bio *bio;
+	struct bio *next;
+	struct bio_list submit_list;
+	struct btrfs_block_group_cache *cache = NULL;
+	struct map_bio_data *map_private;
+	int sent;
+	blk_status_t ret;
+
+	WARN_ON(bio_op(cur_bio) != REQ_OP_WRITE);
+
+	cache = btrfs_lookup_block_group(fs_info, logical);
+	if (!cache || cache->alloc_type != BTRFS_ALLOC_SEQ) {
+		if (cache)
+			btrfs_put_block_group(cache);
+		return __btrfs_map_bio(fs_info, cur_bio, mirror_num,
+				       async_submit, 0);
+	}
+
+	mutex_lock(&cache->submit_lock);
+	if (cache->submit_offset == logical)
+		goto send_bios;
+
+	if (cache->submit_offset > logical) {
+		trace_btrfs_bio_before_write_pointer(cache, cur_bio);
+		mutex_unlock(&cache->submit_lock);
+		btrfs_put_block_group(cache);
+		WARN_ON_ONCE(1);
+		return BLK_STS_IOERR;
+	}
+
+	/* buffer the unaligned bio */
+	map_private = kmalloc(sizeof(*map_private), GFP_NOFS);
+	if (!map_private) {
+		mutex_unlock(&cache->submit_lock);
+		return errno_to_blk_status(-ENOMEM);
+	}
+
+	map_private->orig_bi_private = cur_bio->bi_private;
+	map_private->mirror_num = mirror_num;
+	cur_bio->bi_private = map_private;
+
+	bio_list_add(&cache->submit_buffer, cur_bio);
+	mutex_unlock(&cache->submit_lock);
+	btrfs_put_block_group(cache);
+
+	/* mimic a good result ... */
+	return BLK_STS_OK;
+
+send_bios:
+	mutex_unlock(&cache->submit_lock);
+	/* send this bio */
+	ret = __btrfs_map_bio(fs_info, cur_bio, mirror_num, 1, 1);
+	if (ret != BLK_STS_OK) {
+		/* TODO kill buffered bios */
+		return ret;
+	}
+
+loop:
+	/* and send previously buffered following bios */
+	mutex_lock(&cache->submit_lock);
+	cache->submit_offset += length;
+	length = 0;
+	bio_list_init(&submit_list);
+
+	/* collect sequential bios into submit_list */
+	do {
+		sent = 0;
+		bio = bio_list_get(&cache->submit_buffer);
+		while (bio) {
+			u64 logical =
+				(u64)bio->bi_iter.bi_sector << SECTOR_SHIFT;
+			struct bio_list *target;
+
+			next = bio->bi_next;
+			bio->bi_next = NULL;
+
+			if (logical == cache->submit_offset + length) {
+				sent = 1;
+				length += bio->bi_iter.bi_size;
+				target = &submit_list;
+			} else {
+				target = &cache->submit_buffer;
+			}
+			bio_list_add(target, bio);
+
+			bio = next;
+		}
+	} while (sent);
+	mutex_unlock(&cache->submit_lock);
+
+	/* send the collected bios */
+	while ((bio = bio_list_pop(&submit_list)) != NULL) {
+		map_private = (struct map_bio_data *)bio->bi_private;
+		mirror_num = map_private->mirror_num;
+		bio->bi_private = map_private->orig_bi_private;
+		kfree(map_private);
+
+		ret = __btrfs_map_bio(fs_info, bio, mirror_num, 1, 1);
+		if (ret) {
+			bio->bi_status = ret;
+			bio_endio(bio);
+		}
+	}
+
+	if (length)
+		goto loop;
+	btrfs_put_block_group(cache);
+
+	return BLK_STS_OK;
+}
+
 blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
 			   int mirror_num, int async_submit)
 {
-	return __btrfs_map_bio(fs_info, bio, mirror_num, async_submit);
+	if (btrfs_fs_incompat(fs_info, HMZONED) && bio_op(bio) == REQ_OP_WRITE)
+		return __btrfs_map_bio_zoned(fs_info, bio, mirror_num,
+					     async_submit);
+
+	return __btrfs_map_bio(fs_info, bio, mirror_num, async_submit, 0);
 }
 
 /*
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index f66755e43669..e97d13cb1627 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -329,6 +329,9 @@ struct btrfs_bio {
 	int mirror_num;
 	int num_tgtdevs;
 	int *tgtdev_map;
+	int need_seqwrite;
+	struct list_head list;
+	struct completion *sent;
 	/*
 	 * logical block numbers for the start of each stripe
 	 * The last one or two are p/q.  These are sorted,
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index fe4d268028ee..2b4cd791bf24 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -2091,6 +2091,47 @@ DEFINE_BTRFS_LOCK_EVENT(btrfs_try_tree_read_lock);
 DEFINE_BTRFS_LOCK_EVENT(btrfs_try_tree_write_lock);
 DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_read_lock_atomic);
 
+DECLARE_EVENT_CLASS(btrfs_hmzoned_bio_buffer_events,
+	TP_PROTO(const struct btrfs_block_group_cache *cache,
+		 const struct bio *bio),
+
+	TP_ARGS(cache, bio),
+
+	TP_STRUCT__entry_btrfs(
+		__field(	u64,	block_group	)
+		__field(	u64,	flags		)
+		__field(	u64,	submit_pos	)
+		__field(	u64,	logical	)
+		__field(	u64,	length		)
+	),
+
+	TP_fast_assign_btrfs(cache->fs_info,
+		__entry->block_group = cache->key.objectid;
+		__entry->flags = cache->flags;
+		__entry->submit_pos = cache->submit_offset;
+		__entry->logical = (u64)bio->bi_iter.bi_sector << SECTOR_SHIFT;
+		__entry->length = bio->bi_iter.bi_size;
+	),
+
+	TP_printk_btrfs(
+		"block_group=%llu(%s) submit_pos=%llu logical=%llu length=%llu",
+		__entry->block_group,
+		__print_flags((unsigned long)__entry->flags, "|",
+			      BTRFS_GROUP_FLAGS),
+		__entry->submit_pos, __entry->logical,
+		__entry->length)
+);
+
+#define DEFINE_BTRFS_HMZONED_BIO_BUF_EVENT(name)			\
+DEFINE_EVENT(btrfs_hmzoned_bio_buffer_events, name,			\
+	     TP_PROTO(const struct btrfs_block_group_cache *cache,	\
+		      const struct bio *bio),				\
+									\
+	     TP_ARGS(cache, bio)					\
+)
+
+DEFINE_BTRFS_HMZONED_BIO_BUF_EVENT(btrfs_bio_before_write_pointer);
+
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */
-- 
2.21.0


  parent reply index

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-07 13:10 [PATCH v2 00/19] btrfs zoned block device support Naohiro Aota
2019-06-07 13:10 ` [PATCH 01/19] btrfs: introduce HMZONED feature flag Naohiro Aota
2019-06-07 13:10 ` [PATCH 02/19] btrfs: Get zone information of zoned block devices Naohiro Aota
2019-06-13 13:58   ` Josef Bacik
2019-06-18  6:04     ` Naohiro Aota
2019-06-13 13:58   ` Josef Bacik
2019-06-17 18:57   ` David Sterba
2019-06-18  6:42     ` Naohiro Aota
2019-06-27 15:11       ` David Sterba
2019-06-07 13:10 ` [PATCH 03/19] btrfs: Check and enable HMZONED mode Naohiro Aota
2019-06-13 13:57   ` Josef Bacik
2019-06-18  6:43     ` Naohiro Aota
2019-06-07 13:10 ` [PATCH 04/19] btrfs: disable fallocate in " Naohiro Aota
2019-06-07 13:10 ` [PATCH 05/19] btrfs: disable direct IO " Naohiro Aota
2019-06-13 14:00   ` Josef Bacik
2019-06-18  8:17     ` Naohiro Aota
2019-06-07 13:10 ` [PATCH 06/19] btrfs: align dev extent allocation to zone boundary Naohiro Aota
2019-06-07 13:10 ` [PATCH 07/19] btrfs: do sequential extent allocation in HMZONED mode Naohiro Aota
2019-06-13 14:07   ` Josef Bacik
2019-06-18  8:28     ` Naohiro Aota
2019-06-18 13:37       ` Josef Bacik
2019-06-17 22:30   ` David Sterba
2019-06-18  8:49     ` Naohiro Aota
2019-06-27 15:28       ` David Sterba
2019-06-07 13:10 ` [PATCH 08/19] btrfs: make unmirroed BGs readonly only if we have at least one writable BG Naohiro Aota
2019-06-13 14:09   ` Josef Bacik
2019-06-18  7:42     ` Naohiro Aota
2019-06-18 13:35       ` Josef Bacik
2019-06-07 13:10 ` [PATCH 09/19] btrfs: limit super block locations in HMZONED mode Naohiro Aota
2019-06-13 14:12   ` Josef Bacik
2019-06-18  8:51     ` Naohiro Aota
2019-06-17 22:53   ` David Sterba
2019-06-18  9:01     ` Naohiro Aota
2019-06-27 15:35       ` David Sterba
2019-06-28  3:55   ` Anand Jain
2019-06-28  6:39     ` Naohiro Aota
2019-06-28  6:52       ` Anand Jain
2019-06-07 13:10 ` [PATCH 10/19] btrfs: rename btrfs_map_bio() Naohiro Aota
2019-06-07 13:10 ` Naohiro Aota [this message]
2019-06-13 14:14   ` [PATCH 11/19] btrfs: introduce submit buffer Josef Bacik
2019-06-17  3:16     ` Damien Le Moal
2019-06-18  0:00       ` David Sterba
2019-06-18  4:04         ` Damien Le Moal
2019-06-18 13:33       ` Josef Bacik
2019-06-19 10:32         ` Damien Le Moal
2019-06-07 13:10 ` [PATCH 12/19] btrfs: expire submit buffer on timeout Naohiro Aota
2019-06-13 14:15   ` Josef Bacik
2019-06-17  3:19     ` Damien Le Moal
2019-06-07 13:10 ` [PATCH 13/19] btrfs: avoid sync IO prioritization on checksum in HMZONED mode Naohiro Aota
2019-06-13 14:17   ` Josef Bacik
2019-06-07 13:10 ` [PATCH 14/19] btrfs: redirty released extent buffers in sequential BGs Naohiro Aota
2019-06-13 14:24   ` Josef Bacik
2019-06-18  9:09     ` Naohiro Aota
2019-06-07 13:10 ` [PATCH 15/19] btrfs: reset zones of unused block groups Naohiro Aota
2019-06-07 13:10 ` [PATCH 16/19] btrfs: wait existing extents before truncating Naohiro Aota
2019-06-13 14:25   ` Josef Bacik
2019-06-07 13:10 ` [PATCH 17/19] btrfs: shrink delayed allocation size in HMZONED mode Naohiro Aota
2019-06-13 14:27   ` Josef Bacik
2019-06-07 13:10 ` [PATCH 18/19] btrfs: support dev-replace " Naohiro Aota
2019-06-13 14:33   ` Josef Bacik
2019-06-18  9:14     ` Naohiro Aota
2019-06-07 13:10 ` [PATCH 19/19] btrfs: enable to mount HMZONED incompat flag Naohiro Aota
2019-06-07 13:17 ` [PATCH 01/12] btrfs-progs: build: Check zoned block device support Naohiro Aota
2019-06-07 13:17   ` [PATCH 02/12] btrfs-progs: utils: Introduce queue_param Naohiro Aota
2019-06-07 13:17   ` [PATCH 03/12] btrfs-progs: add new HMZONED feature flag Naohiro Aota
2019-06-07 13:17   ` [PATCH 04/12] btrfs-progs: Introduce zone block device helper functions Naohiro Aota
2019-06-07 13:17   ` [PATCH 05/12] btrfs-progs: load and check zone information Naohiro Aota
2019-06-07 13:17   ` [PATCH 06/12] btrfs-progs: avoid writing super block to sequential zones Naohiro Aota
2019-06-07 13:17   ` [PATCH 07/12] btrfs-progs: support discarding zoned device Naohiro Aota
2019-06-07 13:17   ` [PATCH 08/12] btrfs-progs: volume: align chunk allocation to zones Naohiro Aota
2019-06-07 13:17   ` [PATCH 09/12] btrfs-progs: do sequential allocation Naohiro Aota
2019-06-07 13:17   ` [PATCH 10/12] btrfs-progs: mkfs: Zoned block device support Naohiro Aota
2019-06-07 13:17   ` [PATCH 11/12] btrfs-progs: device-add: support HMZONED device Naohiro Aota
2019-06-07 13:17   ` [PATCH 12/12] btrfs-progs: introduce support for dev-place " Naohiro Aota
2019-06-12 17:51 ` [PATCH v2 00/19] btrfs zoned block device support David Sterba
2019-06-13  4:59   ` Naohiro Aota
2019-06-13 13:46     ` David Sterba
2019-06-14  2:07       ` Naohiro Aota
2019-06-17  2:44       ` Damien Le Moal

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Linux-BTRFS Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-btrfs/0 linux-btrfs/git/0.git

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	public-inbox-index linux-btrfs


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AGPL code for this site: git clone https://public-inbox.org/ public-inbox