From: Christoph Hellwig <hch@lst.de>
Date: Mon, 4 Apr 2022 04:45:26 +0000 (+0200)
Subject: btrfs: don't allocate a btrfs_bio for raid56 per-stripe bios
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e1b4b44e005e2eeef63081fe0a79a6271f81fce4;p=linux.git

btrfs: don't allocate a btrfs_bio for raid56 per-stripe bios

Except for the spurious initialization of ->device just after allocation
nothing uses the btrfs_bio, so just allocate a normal bio without extra
data.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index e0f881e7d77e2..ca53f07e27f06 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -1082,11 +1082,8 @@ static int rbio_add_io_page(struct btrfs_raid_bio *rbio,
 	}
 
 	/* put a new bio on the list */
-	bio = btrfs_bio_alloc(bio_max_len >> PAGE_SHIFT ?: 1);
-	btrfs_bio(bio)->device = stripe->dev;
-	bio->bi_iter.bi_size = 0;
-	bio_set_dev(bio, stripe->dev->bdev);
-	bio->bi_opf = opf;
+	bio = bio_alloc(stripe->dev->bdev, max(bio_max_len >> PAGE_SHIFT, 1UL),
+			opf, GFP_NOFS);
 	bio->bi_iter.bi_sector = disk_start >> 9;
 	bio->bi_private = rbio;