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Commit c8eac49e authored by Brian Foster's avatar Brian Foster Committed by Darrick J. Wong
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xfs: remove all boilerplate defer init/finish code 



At this point, the transaction subsystem completely manages deferred
items internally such that the common and boilerplate
xfs_trans_alloc() -> xfs_defer_init() -> xfs_defer_finish() ->
xfs_trans_commit() sequence can be replaced with a simple
transaction allocation and commit.

Remove all such boilerplate deferred ops code. In doing so, we
change each case over to use the dfops in the transaction and
specifically eliminate:

- The on-stack dfops and associated xfs_defer_init() call, as the
  internal dfops is initialized on transaction allocation.
- xfs_bmap_finish() calls that precede a final xfs_trans_commit() of
  a transaction.
- xfs_defer_cancel() calls in error handlers that precede a
  transaction cancel.

The only deferred ops calls that remain are those that are
non-deterministic with respect to the final commit of the associated
transaction or are open-coded due to special handling.

Signed-off-by: default avatarBrian Foster <bfoster@redhat.com>
Reviewed-by: default avatarBill O'Donnell <billodo@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
parent 91ef75b6

fs/xfs/libxfs/xfs_bmap.c

+1 −15
Original line number Diff line number Diff line
@@ -1018,7 +1018,6 @@ xfs_bmap_add_attrfork( 
	int			size,		/* space new attribute needs */

	int			rsvd)		/* xact may use reserved blks */

{

	struct xfs_defer_ops	dfops;		/* freed extent records */

	xfs_mount_t		*mp;		/* mount structure */

	xfs_trans_t		*tp;		/* transaction pointer */

	int			blks;		/* space reservation */
@@ -1037,7 +1036,6 @@ xfs_bmap_add_attrfork( 
			rsvd ? XFS_TRANS_RESERVE : 0, &tp);

	if (error)

		return error;

	xfs_defer_init(tp, &dfops);



	xfs_ilock(ip, XFS_ILOCK_EXCL);

	error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
@@ -1102,7 +1100,7 @@ xfs_bmap_add_attrfork( 
	if (logflags)

		xfs_trans_log_inode(tp, ip, logflags);

	if (error)

		goto bmap_cancel;

		goto trans_cancel;

	if (!xfs_sb_version_hasattr(&mp->m_sb) ||

	   (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {

		bool log_sb = false;
@@ -1121,15 +1119,10 @@ xfs_bmap_add_attrfork( 
			xfs_log_sb(tp);

	}



	error = xfs_defer_finish(&tp, &dfops);

	if (error)

		goto bmap_cancel;

	error = xfs_trans_commit(tp);

	xfs_iunlock(ip, XFS_ILOCK_EXCL);

	return error;



bmap_cancel:

	xfs_defer_cancel(&dfops);

trans_cancel:

	xfs_trans_cancel(tp);

	xfs_iunlock(ip, XFS_ILOCK_EXCL);
@@ -5953,14 +5946,12 @@ xfs_bmap_split_extent( 
{

	struct xfs_mount        *mp = ip->i_mount;

	struct xfs_trans        *tp;

	struct xfs_defer_ops    dfops;

	int                     error;



	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,

			XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);

	if (error)

		return error;

	xfs_defer_init(tp, &dfops);



	xfs_ilock(ip, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
@@ -5969,14 +5960,9 @@ xfs_bmap_split_extent( 
	if (error)

		goto out;



	error = xfs_defer_finish(&tp, &dfops);

	if (error)

		goto out;



	return xfs_trans_commit(tp);



out:

	xfs_defer_cancel(&dfops);

	xfs_trans_cancel(tp);

	return error;

}

fs/xfs/libxfs/xfs_refcount.c

+1 −9
Original line number Diff line number Diff line
@@ -1635,7 +1635,6 @@ xfs_refcount_recover_cow_leftovers( 
	struct list_head		debris;

	union xfs_btree_irec		low;

	union xfs_btree_irec		high;

	struct xfs_defer_ops		dfops;

	xfs_fsblock_t			fsb;

	xfs_agblock_t			agbno;

	int				error;
@@ -1691,22 +1690,17 @@ xfs_refcount_recover_cow_leftovers( 
		trace_xfs_refcount_recover_extent(mp, agno, &rr->rr_rrec);



		/* Free the orphan record */

		xfs_defer_init(tp, &dfops);

		agbno = rr->rr_rrec.rc_startblock - XFS_REFC_COW_START;

		fsb = XFS_AGB_TO_FSB(mp, agno, agbno);

		error = xfs_refcount_free_cow_extent(mp, tp->t_dfops, fsb,

				rr->rr_rrec.rc_blockcount);

		if (error)

			goto out_defer;

			goto out_trans;



		/* Free the block. */

		xfs_bmap_add_free(mp, tp->t_dfops, fsb,

				rr->rr_rrec.rc_blockcount, NULL);



		error = xfs_defer_finish(&tp, tp->t_dfops);

		if (error)

			goto out_defer;



		error = xfs_trans_commit(tp);

		if (error)

			goto out_free;
@@ -1716,8 +1710,6 @@ xfs_refcount_recover_cow_leftovers( 
	}



	return error;

out_defer:

	xfs_defer_cancel(tp->t_dfops);

out_trans:

	xfs_trans_cancel(tp);

out_free:

fs/xfs/xfs_attr_inactive.c

+0 −2
Original line number Diff line number Diff line
@@ -382,7 +382,6 @@ xfs_attr_inactive( 
{

	struct xfs_trans	*trans;

	struct xfs_mount	*mp;

	struct xfs_defer_ops	dfops;

	int			lock_mode = XFS_ILOCK_SHARED;

	int			error = 0;
@@ -399,7 +398,6 @@ xfs_attr_inactive( 
	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans);

	if (error)

		goto out_destroy_fork;

	xfs_defer_init(trans, &dfops);



	lock_mode = XFS_ILOCK_EXCL;

	xfs_ilock(dp, lock_mode);

fs/xfs/xfs_bmap_util.c

+6 −37
Original line number Diff line number Diff line
@@ -792,7 +792,6 @@ xfs_free_eofblocks( 
	int			nimaps;

	struct xfs_bmbt_irec	imap;

	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_defer_ops	dfops;



	/*

	 * Figure out if there are any blocks beyond the end
@@ -832,7 +831,6 @@ xfs_free_eofblocks( 
			ASSERT(XFS_FORCED_SHUTDOWN(mp));

			return error;

		}

		xfs_defer_init(tp, &dfops);



		xfs_ilock(ip, XFS_ILOCK_EXCL);

		xfs_trans_ijoin(tp, ip, 0);
@@ -880,7 +878,6 @@ xfs_alloc_file_space( 
	int			rt;

	xfs_trans_t		*tp;

	xfs_bmbt_irec_t		imaps[1], *imapp;

	struct xfs_defer_ops	dfops;

	uint			qblocks, resblks, resrtextents;

	int			error;
@@ -973,7 +970,6 @@ xfs_alloc_file_space( 


		xfs_trans_ijoin(tp, ip, 0);



		xfs_defer_init(tp, &dfops);

		error = xfs_bmapi_write(tp, ip, startoffset_fsb,

					allocatesize_fsb, alloc_type, resblks,

					imapp, &nimaps);
@@ -983,10 +979,6 @@ xfs_alloc_file_space( 
		/*

		 * Complete the transaction

		 */

		error = xfs_defer_finish(&tp, tp->t_dfops);

		if (error)

			goto error0;



		error = xfs_trans_commit(tp);

		xfs_iunlock(ip, XFS_ILOCK_EXCL);

		if (error)
@@ -1005,8 +997,7 @@ xfs_alloc_file_space( 


	return error;



error0:	/* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */

	xfs_defer_cancel(&dfops);

error0:	/* unlock inode, unreserve quota blocks, cancel trans */

	xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);



error1:	/* Just cancel transaction */
@@ -1024,7 +1015,6 @@ xfs_unmap_extent( 
{

	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_trans	*tp;

	struct xfs_defer_ops	dfops;

	uint			resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);

	int			error;
@@ -1042,23 +1032,17 @@ xfs_unmap_extent( 


	xfs_trans_ijoin(tp, ip, 0);



	xfs_defer_init(tp, &dfops);

	error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, done);

	if (error)

		goto out_bmap_cancel;

		goto out_trans_cancel;



	xfs_defer_ijoin(tp->t_dfops, ip);

	error = xfs_defer_finish(&tp, tp->t_dfops);

	if (error)

		goto out_bmap_cancel;



	error = xfs_trans_commit(tp);

out_unlock:

	xfs_iunlock(ip, XFS_ILOCK_EXCL);

	return error;



out_bmap_cancel:

	xfs_defer_cancel(tp->t_dfops);

out_trans_cancel:

	xfs_trans_cancel(tp);

	goto out_unlock;
@@ -1310,7 +1294,6 @@ xfs_collapse_file_space( 
	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_trans	*tp;

	int			error;

	struct xfs_defer_ops	dfops;

	xfs_fileoff_t		next_fsb = XFS_B_TO_FSB(mp, offset + len);

	xfs_fileoff_t		shift_fsb = XFS_B_TO_FSB(mp, len);

	uint			resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
@@ -1343,22 +1326,16 @@ xfs_collapse_file_space( 
			goto out_trans_cancel;

		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);



		xfs_defer_init(tp, &dfops);

		error = xfs_bmap_collapse_extents(tp, ip, &next_fsb, shift_fsb,

				&done);

		if (error)

			goto out_bmap_cancel;

			goto out_trans_cancel;



		error = xfs_defer_finish(&tp, tp->t_dfops);

		if (error)

			goto out_bmap_cancel;

		error = xfs_trans_commit(tp);

	}



	return error;



out_bmap_cancel:

	xfs_defer_cancel(tp->t_dfops);

out_trans_cancel:

	xfs_trans_cancel(tp);

	return error;
@@ -1385,7 +1362,6 @@ xfs_insert_file_space( 
	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_trans	*tp;

	int			error;

	struct xfs_defer_ops	dfops;

	xfs_fileoff_t		stop_fsb = XFS_B_TO_FSB(mp, offset);

	xfs_fileoff_t		next_fsb = NULLFSBLOCK;

	xfs_fileoff_t		shift_fsb = XFS_B_TO_FSB(mp, len);
@@ -1421,22 +1397,17 @@ xfs_insert_file_space( 


		xfs_ilock(ip, XFS_ILOCK_EXCL);

		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

		xfs_defer_init(tp, &dfops);

		error = xfs_bmap_insert_extents(tp, ip, &next_fsb, shift_fsb,

				&done, stop_fsb);

		if (error)

			goto out_bmap_cancel;

			goto out_trans_cancel;



		error = xfs_defer_finish(&tp, tp->t_dfops);

		if (error)

			goto out_bmap_cancel;

		error = xfs_trans_commit(tp);

	}



	return error;



out_bmap_cancel:

	xfs_defer_cancel(tp->t_dfops);

out_trans_cancel:

	xfs_trans_cancel(tp);

	return error;

}
@@ -1607,7 +1578,7 @@ xfs_swap_extent_rmap( 


		/* Unmap the old blocks in the source file. */

		while (tirec.br_blockcount) {

			xfs_defer_init(tp, tp->t_dfops);

			ASSERT(tp->t_firstblock == NULLFSBLOCK);

			trace_xfs_swap_extent_rmap_remap_piece(tip, &tirec);



			/* Read extent from the source file */
@@ -1831,7 +1802,6 @@ xfs_swap_extents( 
{

	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_trans	*tp;

	struct xfs_defer_ops	dfops;

	struct xfs_bstat	*sbp = &sxp->sx_stat;

	int			src_log_flags, target_log_flags;

	int			error = 0;
@@ -1900,7 +1870,6 @@ xfs_swap_extents( 
	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);

	if (error)

		goto out_unlock;

	xfs_defer_init(tp, &dfops);



	/*

	 * Lock and join the inodes to the tansaction so that transaction commit

fs/xfs/xfs_dquot.c

+0 −4
Original line number Diff line number Diff line
@@ -295,8 +295,6 @@ xfs_dquot_disk_alloc( 


	trace_xfs_dqalloc(dqp);



	xfs_defer_init(tp, tp->t_dfops);



	xfs_ilock(quotip, XFS_ILOCK_EXCL);

	if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {

		/*
@@ -538,7 +536,6 @@ xfs_qm_dqread_alloc( 
	struct xfs_buf		**bpp)

{

	struct xfs_trans	*tp;

	struct xfs_defer_ops	dfops;

	struct xfs_buf		*bp;

	int			error;
@@ -546,7 +543,6 @@ xfs_qm_dqread_alloc( 
			XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);

	if (error)

		goto err;

	xfs_defer_init(tp, &dfops);



	error = xfs_dquot_disk_alloc(&tp, dqp, &bp);

	if (error)