From: Filipe Manana fdmanana@suse.com
[ Upstream commit fdef89ce6fada462aef9cb90a140c93c8c209f0f ]
At btrfs_qgroup_cleanup_dropped_subvolume() all we want to commit the current transaction in order to have all the qgroup rfer/excl numbers up to date. However we are using btrfs_start_transaction(), which joins the current transaction if there is one that is not yet committing, but also starts a new one if there is none or if the current one is already committing (its state is >= TRANS_STATE_COMMIT_START). This later case results in unnecessary IO, wasting time and a pointless rotation of the backup roots in the super block.
So instead of using btrfs_start_transaction() followed by a btrfs_commit_transaction(), use btrfs_commit_current_transaction() which achieves our purpose and avoids starting and committing new transactions.
Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/qgroup.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 993b5e803699e..f6a024744ba0e 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1898,11 +1898,7 @@ int btrfs_qgroup_cleanup_dropped_subvolume(struct btrfs_fs_info *fs_info, u64 su * Commit current transaction to make sure all the rfer/excl numbers * get updated. */ - trans = btrfs_start_transaction(fs_info->quota_root, 0); - if (IS_ERR(trans)) - return PTR_ERR(trans); - - ret = btrfs_commit_transaction(trans); + ret = btrfs_commit_current_transaction(fs_info->quota_root); if (ret < 0) return ret;