xfs: refactor dfops init to attach to transaction

Most callers of xfs_defer_init() immediately attach the dfops
structure to a transaction. Add a transaction parameter to eliminate
much of this boilerplate code. This also helps self-document the
fact that many codepaths now expect a dfops pointer implicitly via
xfs_trans->t_dfops.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

6 files changed, 30 insertions, 23 deletions

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index a14ab9b2669e..8a7e2c0308c4 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -253,8 +253,7 @@ xfs_attr_set(
 			rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
 	if (error)
 		return error;
-	xfs_defer_init(&dfops, &firstblock);
-	args.trans->t_dfops = &dfops;
+	xfs_defer_init(args.trans, &dfops, &firstblock);
 
 	xfs_ilock(dp, XFS_ILOCK_EXCL);
 	error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
@@ -428,8 +427,7 @@ xfs_attr_remove(
 			&args.trans);
 	if (error)
 		return error;
-	xfs_defer_init(&dfops, &firstblock);
-	args.trans->t_dfops = &dfops;
+	xfs_defer_init(args.trans, &dfops, &firstblock);
 
 	xfs_ilock(dp, XFS_ILOCK_EXCL);
 	/*
@@ -600,7 +598,7 @@ xfs_attr_leaf_addname(
 		 * Commit that transaction so that the node_addname() call
 		 * can manage its own transactions.
 		 */
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		error = xfs_attr3_leaf_to_node(args);
 		if (error)
 			goto out_defer_cancel;
@@ -689,7 +687,8 @@ xfs_attr_leaf_addname(
 		 * If the result is small enough, shrink it all into the inode.
 		 */
 		if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
-			xfs_defer_init(args->trans->t_dfops, args->firstblock);
+			xfs_defer_init(NULL, args->trans->t_dfops,
+				       args->firstblock);
 			error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
 			/* bp is gone due to xfs_da_shrink_inode */
 			if (error)
@@ -754,7 +753,7 @@ xfs_attr_leaf_removename(
 	 * If the result is small enough, shrink it all into the inode.
 	 */
 	if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
 		/* bp is gone due to xfs_da_shrink_inode */
 		if (error)
@@ -883,7 +882,8 @@ restart:
 			 */
 			xfs_da_state_free(state);
 			state = NULL;
-			xfs_defer_init(args->trans->t_dfops, args->firstblock);
+			xfs_defer_init(NULL, args->trans->t_dfops,
+				       args->firstblock);
 			error = xfs_attr3_leaf_to_node(args);
 			if (error)
 				goto out_defer_cancel;
@@ -910,7 +910,7 @@ restart:
 		 * in the index/blkno/rmtblkno/rmtblkcnt fields and
 		 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
 		 */
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		error = xfs_da3_split(state);
 		if (error)
 			goto out_defer_cancel;
@@ -1008,7 +1008,8 @@ restart:
 		 * Check to see if the tree needs to be collapsed.
 		 */
 		if (retval && (state->path.active > 1)) {
-			xfs_defer_init(args->trans->t_dfops, args->firstblock);
+			xfs_defer_init(NULL, args->trans->t_dfops,
+				       args->firstblock);
 			error = xfs_da3_join(state);
 			if (error)
 				goto out_defer_cancel;
@@ -1133,7 +1134,7 @@ xfs_attr_node_removename(
 	 * Check to see if the tree needs to be collapsed.
 	 */
 	if (retval && (state->path.active > 1)) {
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		error = xfs_da3_join(state);
 		if (error)
 			goto out_defer_cancel;
@@ -1165,7 +1166,8 @@ xfs_attr_node_removename(
 			goto out;
 
 		if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
-			xfs_defer_init(args->trans->t_dfops, args->firstblock);
+			xfs_defer_init(NULL, args->trans->t_dfops,
+				       args->firstblock);
 			error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
 			/* bp is gone due to xfs_da_shrink_inode */
 			if (error)
diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index 179259fd1b5e..ab7c2755ad8c 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -480,7 +480,7 @@ xfs_attr_rmtval_set(
 		 * extent and then crash then the block may not contain the
 		 * correct metadata after log recovery occurs.
 		 */
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		nmap = 1;
 		error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
 				  blkcnt, XFS_BMAPI_ATTRFORK, args->firstblock,
@@ -522,7 +522,7 @@ xfs_attr_rmtval_set(
 
 		ASSERT(blkcnt > 0);
 
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		nmap = 1;
 		error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
 				       blkcnt, &map, &nmap,
@@ -626,7 +626,7 @@ xfs_attr_rmtval_remove(
 	blkcnt = args->rmtblkcnt;
 	done = 0;
 	while (!done) {
-		xfs_defer_init(args->trans->t_dfops, args->firstblock);
+		xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
 		error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
 				    XFS_BMAPI_ATTRFORK, 1, args->firstblock,
 				    &done);
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 32d8d87b7582..dfff840c79f9 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -1050,8 +1050,7 @@ xfs_bmap_add_attrfork(
 			rsvd ? XFS_TRANS_RESERVE : 0, &tp);
 	if (error)
 		return error;
-	xfs_defer_init(&dfops, &firstblock);
-	tp->t_dfops = &dfops;
+	xfs_defer_init(tp, &dfops, &firstblock);
 
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
@@ -6025,8 +6024,7 @@ xfs_bmap_split_extent(
 			XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
 	if (error)
 		return error;
-	xfs_defer_init(&dfops, &firstfsb);
-	tp->t_dfops = &dfops;
+	xfs_defer_init(tp, &dfops, &firstfsb);
 
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index 560a7d178c1e..6b25a9436829 100644
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -523,12 +523,19 @@ xfs_defer_init_op_type(
 /* Initialize a deferred operation. */
 void
 xfs_defer_init(
+	struct xfs_trans		*tp,
 	struct xfs_defer_ops		*dop,
 	xfs_fsblock_t			*fbp)
 {
+	struct xfs_mount		*mp = NULL;
+
 	memset(dop, 0, sizeof(struct xfs_defer_ops));
 	*fbp = NULLFSBLOCK;
 	INIT_LIST_HEAD(&dop->dop_intake);
 	INIT_LIST_HEAD(&dop->dop_pending);
-	trace_xfs_defer_init(NULL, dop, _RET_IP_);
+	if (tp) {
+		tp->t_dfops = dop;
+		mp = tp->t_mountp;
+	}
+	trace_xfs_defer_init(mp, dop, _RET_IP_);
 }
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index a02b2b748b6d..56eaaac31df5 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -63,7 +63,8 @@ void xfs_defer_add(struct xfs_defer_ops *dop, enum xfs_defer_ops_type type,
 		struct list_head *h);
 int xfs_defer_finish(struct xfs_trans **tp, struct xfs_defer_ops *dop);
 void xfs_defer_cancel(struct xfs_defer_ops *dop);
-void xfs_defer_init(struct xfs_defer_ops *dop, xfs_fsblock_t *fbp);
+void xfs_defer_init(struct xfs_trans *tp, struct xfs_defer_ops *dop,
+		    xfs_fsblock_t *fbp);
 bool xfs_defer_has_unfinished_work(struct xfs_defer_ops *dop);
 int xfs_defer_ijoin(struct xfs_defer_ops *dop, struct xfs_inode *ip);
 int xfs_defer_bjoin(struct xfs_defer_ops *dop, struct xfs_buf *bp);
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index df67821fb5f4..8dc380574cd8 100644
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -1691,8 +1691,7 @@ xfs_refcount_recover_cow_leftovers(
 		trace_xfs_refcount_recover_extent(mp, agno, &rr->rr_rrec);
 
 		/* Free the orphan record */
-		xfs_defer_init(&dfops, &fsb);
-		tp->t_dfops = &dfops;
+		xfs_defer_init(tp, &dfops, &fsb);
 		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,