linux-kernel - [PATCH 5.17 192/225] btrfs: fix direct I/O writes for split bios on zoned devices

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Date:   Wed,  4 May 2022 18:47:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Naohiro Aota <naohiro.aota@....com>, Qu Wenruo <wqu@...e.com>,
        Sweet Tea Dorminy <sweettea-kernel@...miny.me>,
        Christoph Hellwig <hch@....de>, David Sterba <dsterba@...e.com>
Subject: [PATCH 5.17 192/225] btrfs: fix direct I/O writes for split bios on zoned devices

From: Christoph Hellwig <hch@....de>

commit 0fdf977d4576ee0decd612e22f6a837a239573cc upstream.

When a bio is split in btrfs_submit_direct, dip->file_offset contains
the file offset for the first bio.  But this means the start value used
in btrfs_end_dio_bio to record the write location for zone devices is
incorrect for subsequent bios.

CC: stable@...r.kernel.org # 5.16+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Reviewed-by: Naohiro Aota <naohiro.aota@....com>
Reviewed-by: Qu Wenruo <wqu@...e.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@...miny.me>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/inode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7845,6 +7845,7 @@ static blk_status_t btrfs_submit_bio_sta
 static void btrfs_end_dio_bio(struct bio *bio)
 {
 	struct btrfs_dio_private *dip = bio->bi_private;
+	struct btrfs_bio *bbio = btrfs_bio(bio);
 	blk_status_t err = bio->bi_status;
 
 	if (err)
@@ -7855,12 +7856,12 @@ static void btrfs_end_dio_bio(struct bio
 			   bio->bi_iter.bi_size, err);
 
 	if (bio_op(bio) == REQ_OP_READ)
-		err = btrfs_check_read_dio_bio(dip, btrfs_bio(bio), !err);
+		err = btrfs_check_read_dio_bio(dip, bbio, !err);
 
 	if (err)
 		dip->dio_bio->bi_status = err;
 
-	btrfs_record_physical_zoned(dip->inode, dip->file_offset, bio);
+	btrfs_record_physical_zoned(dip->inode, bbio->file_offset, bio);
 
 	bio_put(bio);
 	btrfs_dio_private_put(dip);