From: Filipe Manana fdmanana@suse.com
commit 40b0a749388517de244643c09bdbb98f7dcb6ef1 upstream.
At __btrfs_cow_block(), instead of doing a BUG_ON() in case we fail to record a tree mod log root insertion operation, do a transaction abort instead. There's really no need for the BUG_ON(), we can properly release all resources in this context and turn the filesystem to RO mode and in an error state instead.
CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/ctree.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
--- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -475,9 +475,14 @@ static noinline int __btrfs_cow_block(st btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV) parent_start = buf->start;
- atomic_inc(&cow->refs); ret = btrfs_tree_mod_log_insert_root(root->node, cow, true); - BUG_ON(ret < 0); + if (ret < 0) { + btrfs_tree_unlock(cow); + free_extent_buffer(cow); + btrfs_abort_transaction(trans, ret); + return ret; + } + atomic_inc(&cow->refs); rcu_assign_pointer(root->node, cow);
btrfs_free_tree_block(trans, btrfs_root_id(root), buf,