linux-kernel - [PATCH] erofs: release ztailpacking pclusters properly

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Date:   Tue, 22 Aug 2023 19:05:30 +0800
From:   Jingbo Xu <jefflexu@...ux.alibaba.com>
To:     hsiangkao@...ux.alibaba.com, chao@...nel.org,
        linux-erofs@...ts.ozlabs.org
Cc:     huyue2@...lpad.com, linux-kernel@...r.kernel.org
Subject: [PATCH] erofs: release ztailpacking pclusters properly

Currently ztailpacking pclusters are chained with FOLLOWED_NOINPLACE and
not recorded into the managed_pslots XArray.

After commit 7674a42f35ea ("erofs: use struct lockref to replace
handcrafted approach"), ztailpacking pclusters won't be freed with
erofs_workgroup_put() anymore, which will cause the following issue:

BUG erofs_pcluster-1 (Tainted: G           OE     ): Objects remaining in erofs_pcluster-1 on __kmem_cache_shutdown()

Use z_erofs_free_pcluster() directly to free ztailpacking pclusters.

Fixes: 7674a42f35ea ("erofs: use struct lockref to replace handcrafted approach")
Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
---
 fs/erofs/zdata.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index de4f12152b62..5419405cafb3 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1410,7 +1410,10 @@ static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io,
 		owned = READ_ONCE(be.pcl->next);
 
 		z_erofs_decompress_pcluster(&be, io->eio ? -EIO : 0);
-		erofs_workgroup_put(&be.pcl->obj);
+		if (z_erofs_is_inline_pcluster(be.pcl))
+			z_erofs_free_pcluster(be.pcl);
+		else
+			erofs_workgroup_put(&be.pcl->obj);
 	}
 }
 
-- 
2.19.1.6.gb485710b