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From: Christoph Hellwig <hch@lst.de>
To: David Sterba <dsterba@suse.com>,
	Josef Bacik <josef@toxicpanda.com>, Qu Wenruo <wqu@suse.com>
Cc: linux-btrfs@vger.kernel.org
Subject: [PATCH 09/10] btrfs: refactor btrfs_map_bio
Date: Thu, 26 May 2022 09:36:41 +0200	[thread overview]
Message-ID: <20220526073642.1773373-10-hch@lst.de> (raw)
In-Reply-To: <20220526073642.1773373-1-hch@lst.de>

Move all per-stripe handling into submit_stripe_bio and use a label to
cleanup instead of duplicating the logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/volumes.c | 77 +++++++++++++++++++++-------------------------
 1 file changed, 35 insertions(+), 42 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 55a6501a02cc0..bd82735fbfbbe 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6700,10 +6700,30 @@ static void btrfs_end_bio(struct bio *bio)
 		btrfs_end_bioc(bioc, true);
 }
 
-static void submit_stripe_bio(struct btrfs_io_context *bioc, struct bio *bio,
-			      u64 physical, struct btrfs_device *dev)
+static void submit_stripe_bio(struct btrfs_io_context *bioc,
+		struct bio *orig_bio, int dev_nr, bool clone)
 {
 	struct btrfs_fs_info *fs_info = bioc->fs_info;
+	struct btrfs_device *dev = bioc->stripes[dev_nr].dev;
+	u64 physical = bioc->stripes[dev_nr].physical;
+	struct bio *bio;
+
+	if (!dev || !dev->bdev ||
+	    test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) ||
+	    (btrfs_op(orig_bio) == BTRFS_MAP_WRITE &&
+	     !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))) {
+		atomic_inc(&bioc->error);
+		if (atomic_dec_and_test(&bioc->stripes_pending))
+			btrfs_end_bioc(bioc, false);
+		return;
+	}
+
+	if (clone) {
+		bio = btrfs_bio_clone(dev->bdev, orig_bio);
+	} else {
+		bio = orig_bio;
+		bio_set_dev(bio, dev->bdev);
+	}
 
 	bio->bi_private = bioc;
 	btrfs_bio(bio)->device = dev;
@@ -6738,32 +6758,25 @@ static void submit_stripe_bio(struct btrfs_io_context *bioc, struct bio *bio,
 blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
 			   int mirror_num)
 {
-	struct btrfs_device *dev;
-	struct bio *first_bio = bio;
 	u64 logical = bio->bi_iter.bi_sector << 9;
-	u64 length = 0;
-	u64 map_length;
+	u64 length = bio->bi_iter.bi_size;
+	u64 map_length = length;
 	int ret;
 	int dev_nr;
 	int total_devs;
 	struct btrfs_io_context *bioc = NULL;
 
-	length = bio->bi_iter.bi_size;
-	map_length = length;
-
 	btrfs_bio_counter_inc_blocked(fs_info);
 	ret = __btrfs_map_block(fs_info, btrfs_op(bio), logical,
 				&map_length, &bioc, mirror_num, 1);
-	if (ret) {
-		btrfs_bio_counter_dec(fs_info);
-		return errno_to_blk_status(ret);
-	}
+	if (ret)
+		goto out_dec;
 
 	total_devs = bioc->num_stripes;
-	bioc->orig_bio = first_bio;
-	bioc->private = first_bio->bi_private;
-	bioc->end_io = first_bio->bi_end_io;
-	atomic_set(&bioc->stripes_pending, bioc->num_stripes);
+	bioc->orig_bio = bio;
+	bioc->private = bio->bi_private;
+	bioc->end_io = bio->bi_end_io;
+	atomic_set(&bioc->stripes_pending, total_devs);
 
 	if ((bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) &&
 	    ((btrfs_op(bio) == BTRFS_MAP_WRITE) || (mirror_num > 1))) {
@@ -6775,9 +6788,7 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
 			ret = raid56_parity_recover(bio, bioc, map_length,
 						    mirror_num, 1);
 		}
-
-		btrfs_bio_counter_dec(fs_info);
-		return errno_to_blk_status(ret);
+		goto out_dec;
 	}
 
 	if (map_length < length) {
@@ -6787,29 +6798,11 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
 		BUG();
 	}
 
-	for (dev_nr = 0; dev_nr < total_devs; dev_nr++) {
-		dev = bioc->stripes[dev_nr].dev;
-		if (!dev || !dev->bdev || test_bit(BTRFS_DEV_STATE_MISSING,
-						   &dev->dev_state) ||
-		    (btrfs_op(first_bio) == BTRFS_MAP_WRITE &&
-		    !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))) {
-			atomic_inc(&bioc->error);
-			if (atomic_dec_and_test(&bioc->stripes_pending))
-				btrfs_end_bioc(bioc, false);
-			continue;
-		}
-
-		if (dev_nr < total_devs - 1) {
-			bio = btrfs_bio_clone(dev->bdev, first_bio);
-		} else {
-			bio = first_bio;
-			bio_set_dev(bio, dev->bdev);
-		}
-
-		submit_stripe_bio(bioc, bio, bioc->stripes[dev_nr].physical, dev);
-	}
+	for (dev_nr = 0; dev_nr < total_devs; dev_nr++)
+		submit_stripe_bio(bioc, bio, dev_nr, dev_nr < total_devs - 1);
+out_dec:
 	btrfs_bio_counter_dec(fs_info);
-	return BLK_STS_OK;
+	return errno_to_blk_status(ret);
 }
 
 static bool dev_args_match_fs_devices(const struct btrfs_dev_lookup_args *args,
-- 
2.30.2


  parent reply	other threads:[~2022-05-26  7:37 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-26  7:36 cleanup btrfs bio handling, part 2 v4 Christoph Hellwig
2022-05-26  7:36 ` [PATCH 01/10] btrfs: move more work into btrfs_end_bioc Christoph Hellwig
2022-05-26  7:36 ` [PATCH 02/10] btrfs: cleanup btrfs_submit_dio_bio Christoph Hellwig
2022-06-01 19:32   ` David Sterba
2022-05-26  7:36 ` [PATCH 03/10] btrfs: split btrfs_submit_data_bio Christoph Hellwig
2022-05-26  7:36 ` [PATCH 04/10] btrfs: defer I/O completion based on the btrfs_raid_bio Christoph Hellwig
2022-05-26  7:36 ` [PATCH 05/10] btrfs: don't double-defer bio completions for compressed reads Christoph Hellwig
2022-05-26  7:36 ` [PATCH 06/10] btrfs: don't use btrfs_bio_wq_end_io for compressed writes Christoph Hellwig
2022-06-01 19:33   ` David Sterba
2022-05-26  7:36 ` [PATCH 07/10] btrfs: centralize setting REQ_META Christoph Hellwig
2022-05-26  7:36 ` [PATCH 08/10] btrfs: remove btrfs_end_io_wq Christoph Hellwig
2022-05-26  7:36 ` Christoph Hellwig [this message]
2022-06-01 19:36   ` [PATCH 09/10] btrfs: refactor btrfs_map_bio David Sterba
2022-05-26  7:36 ` [PATCH 10/10] btrfs: do not allocate a btrfs_bio for low-level bios Christoph Hellwig
2022-06-01 19:39   ` David Sterba
2022-06-01 19:29 ` cleanup btrfs bio handling, part 2 v4 David Sterba
2022-06-03 16:47   ` David Sterba
  -- strict thread matches above, loose matches on Subject: below --
2022-05-04 12:25 cleanup btrfs bio handling, part 2 v3 Christoph Hellwig
2022-05-04 12:25 ` [PATCH 09/10] btrfs: refactor btrfs_map_bio Christoph Hellwig
2022-05-04 12:46   ` Qu Wenruo
2022-04-29 14:30 cleanup btrfs bio handling, part 2 v2 Christoph Hellwig
2022-04-29 14:30 ` [PATCH 09/10] btrfs: refactor btrfs_map_bio Christoph Hellwig
2022-04-25  7:54 cleanup btrfs bio handling, part 2 Christoph Hellwig
2022-04-25  7:54 ` [PATCH 09/10] btrfs: refactor btrfs_map_bio Christoph Hellwig
2022-04-25  8:56   ` Qu Wenruo
2022-04-25  9:17     ` Christoph Hellwig
2022-04-26 13:24     ` Christoph Hellwig

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