linux-kernel - [PATCH 4.9 136/141] btrfs: reset max_extent

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Date:   Sun, 11 Nov 2018 14:26:35 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Liu Bo <bo.liu@...ux.alibaba.com>,
        Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>
Subject: [PATCH 4.9 136/141] btrfs: reset max_extent_size on clear in a bitmap

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Josef Bacik <jbacik@...com>

commit 553cceb49681d60975d00892877d4c871bf220f9 upstream.

We need to clear the max_extent_size when we clear bits from a bitmap
since it could have been from the range that contains the
max_extent_size.

CC: stable@...r.kernel.org # 4.4+
Reviewed-by: Liu Bo <bo.liu@...ux.alibaba.com>
Signed-off-by: Josef Bacik <jbacik@...com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/free-space-cache.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1693,6 +1693,8 @@ static inline void __bitmap_clear_bits(s
 	bitmap_clear(info->bitmap, start, count);
 
 	info->bytes -= bytes;
+	if (info->max_extent_size > ctl->unit)
+		info->max_extent_size = 0;
 }
 
 static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,