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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Nikolay Borisov <nborisov@suse.com>,
        David Sterba <dsterba@suse.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.15 139/189] btrfs: Ignore errors from
 btrfs_qgroup_trace_extent_post
Thread-Topic: [PATCH AUTOSEL for 4.15 139/189] btrfs: Ignore errors from
 btrfs_qgroup_trace_extent_post
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Date:   Mon, 9 Apr 2018 00:18:39 +0000
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From: Nikolay Borisov <nborisov@suse.com>

[ Upstream commit 952bd3db0dada9994fa7edd891178075abcc045d ]

Running generic/019 with qgroups on the scratch device enabled is almost
guaranteed to trigger the BUG_ON in btrfs_free_tree_block. It's supposed
to trigger only on -ENOMEM, in reality, however, it's possible to get
-EIO from btrfs_qgroup_trace_extent_post. This function just finds the
roots of the extent being tracked and sets the qrecord->old_roots list.
If this operation fails nothing critical happens except the quota
accounting can be considered wrong. In such case just set the
INCONSISTENT flag for the quota and print a warning, rather than killing
off the system. Additionally, it's possible to trigger a BUG_ON in
btrfs_truncate_inode_items as well.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
[ error message adjustments ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 fs/btrfs/delayed-ref.c | 3 ++-
 fs/btrfs/qgroup.c      | 9 +++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 83be8f9fd906..fa552a5ac103 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -821,7 +821,8 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs=
_info,
 	spin_unlock(&delayed_refs->lock);
=20
 	if (qrecord_inserted)
-		return btrfs_qgroup_trace_extent_post(fs_info, record);
+		btrfs_qgroup_trace_extent_post(fs_info, record);
+
 	return 0;
=20
 free_head_ref:
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 168fd03ca3ac..388731481e9d 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1442,8 +1442,13 @@ int btrfs_qgroup_trace_extent_post(struct btrfs_fs_i=
nfo *fs_info,
 	int ret;
=20
 	ret =3D btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
-	if (ret < 0)
-		return ret;
+	if (ret < 0) {
+		fs_info->qgroup_flags |=3D BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
+		btrfs_warn(fs_info,
+"error accounting new delayed refs extent (err code: %d), quota inconsiste=
nt",
+			ret);
+		return 0;
+	}
=20
 	/*
 	 * Here we don't need to get the lock of
--=20
2.15.1