On Mon, Nov 25, 2024 at 05:28:53PM -0800, Darrick J. Wong wrote:
From: Darrick J. Wong djwong@kernel.org
Superblock counter updates are tracked via per-transaction counters in the xfs_trans object. These changes are then turned into dirty log items in xfs_trans_apply_sb_deltas just prior to commiting the log items to the CIL.
However, updating the per-transaction counter deltas do not cause XFS_TRANS_DIRTY to be set on the transaction. In other words, a pure sb counter update will be silently discarded if there are no other dirty log items attached to the transaction.
This is currently not the case anywhere in the filesystem because sb counter updates always dirty at least one other metadata item, but let's not leave a logic bomb.
xfs_trans_mod_sb is the only place that sets XFS_TRANS_SB_DIRTY, and always forces XFS_TRANS_DIRTY. So this seems kinda intentional, even if this new version is much cleaner. So the change looks fine:
Reviewed-by: Christoph Hellwig hch@lst.de
But I don't think the Fixes tag is really warranted.