linux-kernel - [PATCH AUTOSEL 5.4 2/8] btrfs: return -EUCLEAN for delayed tree ref with a ref count not equals to 1

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Message-Id: <20231008005024.3768418-2-sashal@kernel.org>
Date:   Sat,  7 Oct 2023 20:50:18 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Filipe Manana <fdmanana@...e.com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Sasha Levin <sashal@...nel.org>, clm@...com,
        linux-btrfs@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 2/8] btrfs: return -EUCLEAN for delayed tree ref with a ref count not equals to 1

From: Filipe Manana <fdmanana@...e.com>

[ Upstream commit 1bf76df3fee56d6637718e267f7c34ed70d0c7dc ]

When running a delayed tree reference, if we find a ref count different
from 1, we return -EIO. This isn't an IO error, as it indicates either a
bug in the delayed refs code or a memory corruption, so change the error
code from -EIO to -EUCLEAN. Also tag the branch as 'unlikely' as this is
not expected to ever happen, and change the error message to print the
tree block's bytenr without the parenthesis (and there was a missing space
between the 'block' word and the opening parenthesis), for consistency as
that's the style we used everywhere else.

Reviewed-by: Josef Bacik <josef@...icpanda.com>
Signed-off-by: Filipe Manana <fdmanana@...e.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/btrfs/extent-tree.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a9191a0d2f4c9..f47316edcf423 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1681,12 +1681,12 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
 		parent = ref->parent;
 	ref_root = ref->root;
 
-	if (node->ref_mod != 1) {
+	if (unlikely(node->ref_mod != 1)) {
 		btrfs_err(trans->fs_info,
-	"btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu",
+	"btree block %llu has %d references rather than 1: action %d ref_root %llu parent %llu",
 			  node->bytenr, node->ref_mod, node->action, ref_root,
 			  parent);
-		return -EIO;
+		return -EUCLEAN;
 	}
 	if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
 		BUG_ON(!extent_op || !extent_op->update_flags);
-- 
2.40.1