xfs: defer agfl block frees from deferred ops processing context (2bc5eba8) · Commits · 戴 / test

Now that AGFL block frees are deferred when dfops is set in the transaction, start deferring AGFL block frees from contexts that are known to push the limits of existing log reservations. The first such context is deferred operation processing itself. This primarily targets deferred extent frees (such as file extents and inode chunks), but in doing so covers all allocation operations that occur in deferred operation processing context. Update xfs_defer_finish() to set and reset ->t_agfl_dfops across the processing sequence. This means that any AGFL block frees due to allocation events result in the addition of new EFIs to the dfops rather than being processed immediately. xfs_defer_finish() rolls the transaction at least once more to process the frees of the AGFL blocks back to the allocation btrees and returns once the AGFL is rectified. Signed-off-by:

Brian Foster <bfoster@redhat.com> Reviewed-by:

Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:

Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_defer.c

+12 −0

Original line number	Original line	Diff line number	Diff line
	@@ -352,11 +352,22 @@ xfs_defer_finish(
	void *state;		void *state;
	int error = 0;		int error = 0;
	void (cleanup_fn)(struct xfs_trans , void *, int);		void (cleanup_fn)(struct xfs_trans , void *, int);
			struct xfs_defer_ops *orig_dop;

	ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);		ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);

	trace_xfs_defer_finish((*tp)->t_mountp, dop);		trace_xfs_defer_finish((*tp)->t_mountp, dop);

			/*
			* Attach dfops to the transaction during deferred ops processing. This
			* explicitly causes calls into the allocator to defer AGFL block frees.
			* Note that this code can go away once all dfops users attach to the
			* associated tp.
			*/
			ASSERT(!(tp)->t_agfl_dfops \|\| ((tp)->t_agfl_dfops == dop));
			orig_dop = (*tp)->t_agfl_dfops;
			(*tp)->t_agfl_dfops = dop;

	/* Until we run out of pending work to finish... */		/* Until we run out of pending work to finish... */
	while (xfs_defer_has_unfinished_work(dop)) {		while (xfs_defer_has_unfinished_work(dop)) {
	/* Log intents for work items sitting in the intake. */		/* Log intents for work items sitting in the intake. */
	@@ -428,6 +439,7 @@ xfs_defer_finish(
	}		}

	out:		out:
			(*tp)->t_agfl_dfops = orig_dop;
	if (error)		if (error)
	trace_xfs_defer_finish_error((*tp)->t_mountp, dop, error);		trace_xfs_defer_finish_error((*tp)->t_mountp, dop, error);
	else		else

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