linux-kernel - [PATCH 5.16 0145/1017] btrfs: zoned: put block group after final usage

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Message-Id: <20220405070358.507991164@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:17:38 +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>,
        Nikolay Borisov <nborisov@...e.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.16 0145/1017] btrfs: zoned: put block group after final usage

From: Nikolay Borisov <nborisov@...e.com>

commit d3e29967079c522ce1c5cab0e9fab2c280b977eb upstream.

It's counter-intuitive (and wrong) to put the block group _before_ the
final usage in submit_eb_page. Fix it by re-ordering the call to
btrfs_put_block_group after its final reference. Also fix a minor typo
in 'implies'

Fixes: be1a1d7a5d24 ("btrfs: zoned: finish fully written block group")
CC: stable@...r.kernel.org # 5.16+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Signed-off-by: Nikolay Borisov <nborisov@...e.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/extent_io.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4800,11 +4800,12 @@ static int submit_eb_page(struct page *p
 		return ret;
 	}
 	if (cache) {
-		/* Impiles write in zoned mode */
-		btrfs_put_block_group(cache);
-		/* Mark the last eb in a block group */
+		/*
+		 * Implies write in zoned mode. Mark the last eb in a block group.
+		 */
 		if (cache->seq_zone && eb->start + eb->len == cache->zone_capacity)
 			set_bit(EXTENT_BUFFER_ZONE_FINISH, &eb->bflags);
+		btrfs_put_block_group(cache);
 	}
 	ret = write_one_eb(eb, wbc, epd);
 	free_extent_buffer(eb);