[PATCH AUTOSEL for 4.15 139/189] btrfs: Ignore errors from btrfs_qgroup_trace_extent_post

[Sasha Levin]

From: Nikolay Borisov <nbori...@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 <nbori...@suse.com>
Reviewed-by: Qu Wenruo <w...@suse.com>
[ error message adjustments ]
Signed-off-by: David Sterba <dste...@suse.com>
Signed-off-by: Sasha Levin <alexander.le...@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);
 
        if (qrecord_inserted)
-               return btrfs_qgroup_trace_extent_post(fs_info, record);
+               btrfs_qgroup_trace_extent_post(fs_info, record);
+
        return 0;
 
 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_info 
*fs_info,
        int ret;
 
        ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
-       if (ret < 0)
-               return ret;
+       if (ret < 0) {
+               fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
+               btrfs_warn(fs_info,
+"error accounting new delayed refs extent (err code: %d), quota inconsistent",
+                       ret);
+               return 0;
+       }
 
        /*
         * Here we don't need to get the lock of
-- 
2.15.1