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From 5150bf19635c335109542c19f6b84c7813810873 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@suse.com>
Date: Fri, 17 Apr 2020 16:36:15 +0100
Subject: [PATCH] btrfs: fix memory leak of transaction when deleting unused
block group
When cleaning pinned extents right before deleting an unused block group,
we check if there's still a previous transaction running and if so we
increment its reference count before using it for cleaning pinned ranges
in its pinned extents iotree. However we ended up never decrementing the
reference count after using the transaction, resulting in a memory leak.
Fix it by decrementing the reference count.
Fixes: fe119a6eeb6705 ("btrfs: switch to per-transaction pinned extents")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/block-group.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 47f66c6a7d7f..af9e9a008724 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1288,11 +1288,15 @@ static bool clean_pinned_extents(struct btrfs_trans_handle *trans,
if (ret)
goto err;
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
+ if (prev_trans)
+ btrfs_put_transaction(prev_trans);
return true;
err:
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
+ if (prev_trans)
+ btrfs_put_transaction(prev_trans);
btrfs_dec_block_group_ro(bg);
return false;
}
--
2.26.2
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