xfs: automatic dfops inode relogging

Inodes that are held across deferred operations are explicitly
joined to the dfops structure to ensure appropriate relogging.
While inodes are currently joined explicitly, we can detect the
conditions that require relogging at dfops finish time by inspecting
the transaction item list for inodes with ili_lock_flags == 0.

Replace the xfs_defer_ijoin() infrastructure with such detection and
automatic relogging of held inodes. This eliminates the need for the
per-dfops inode list, replaced by an on-stack variant in
xfs_defer_trans_roll().
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>

fs/xfs/libxfs/xfs_attr.c

@@ -320,7 +320,6 @@ xfs_attr_set(
 		 * buffer and run into problems with the write verifier.
 		 */
 		xfs_trans_bhold(args.trans, leaf_bp);
-		xfs_defer_ijoin(args.trans->t_dfops, dp);
 		error = xfs_defer_finish(&args.trans);
 		if (error)
 			goto out;
@@ -589,7 +588,6 @@ xfs_attr_leaf_addname(
 		error = xfs_attr3_leaf_to_node(args);
 		if (error)
 			goto out_defer_cancel;
-		xfs_defer_ijoin(args->trans->t_dfops, dp);
 		error = xfs_defer_finish(&args->trans);
 		if (error)
 			goto out_defer_cancel;
@@ -678,7 +676,6 @@ xfs_attr_leaf_addname(
 			/* bp is gone due to xfs_da_shrink_inode */
 			if (error)
 				goto out_defer_cancel;
-			xfs_defer_ijoin(args->trans->t_dfops, dp);
 			error = xfs_defer_finish(&args->trans);
 			if (error)
 				goto out_defer_cancel;
@@ -742,7 +739,6 @@ xfs_attr_leaf_removename(
 		/* bp is gone due to xfs_da_shrink_inode */
 		if (error)
 			goto out_defer_cancel;
-		xfs_defer_ijoin(args->trans->t_dfops, dp);
 		error = xfs_defer_finish(&args->trans);
 		if (error)
 			goto out_defer_cancel;
@@ -869,7 +865,6 @@ xfs_attr_node_addname(
 			error = xfs_attr3_leaf_to_node(args);
 			if (error)
 				goto out_defer_cancel;
-			xfs_defer_ijoin(args->trans->t_dfops, dp);
 			error = xfs_defer_finish(&args->trans);
 			if (error)
 				goto out_defer_cancel;
@@ -894,7 +889,6 @@ xfs_attr_node_addname(
 		error = xfs_da3_split(state);
 		if (error)
 			goto out_defer_cancel;
-		xfs_defer_ijoin(args->trans->t_dfops, dp);
 		error = xfs_defer_finish(&args->trans);
 		if (error)
 			goto out_defer_cancel;
@@ -991,7 +985,6 @@ xfs_attr_node_addname(
 			error = xfs_da3_join(state);
 			if (error)
 				goto out_defer_cancel;
-			xfs_defer_ijoin(args->trans->t_dfops, dp);
 			error = xfs_defer_finish(&args->trans);
 			if (error)
 				goto out_defer_cancel;
@@ -1115,7 +1108,6 @@ xfs_attr_node_removename(
 		error = xfs_da3_join(state);
 		if (error)
 			goto out_defer_cancel;
-		xfs_defer_ijoin(args->trans->t_dfops, dp);
 		error = xfs_defer_finish(&args->trans);
 		if (error)
 			goto out_defer_cancel;
@@ -1147,7 +1139,6 @@ xfs_attr_node_removename(
 			/* bp is gone due to xfs_da_shrink_inode */
 			if (error)
 				goto out_defer_cancel;
-			xfs_defer_ijoin(args->trans->t_dfops, dp);
 			error = xfs_defer_finish(&args->trans);
 			if (error)
 				goto out_defer_cancel;

fs/xfs/libxfs/xfs_attr_remote.c

@@ -486,7 +486,6 @@ xfs_attr_rmtval_set(
 				  &nmap);
 		if (error)
 			goto out_defer_cancel;
-		xfs_defer_ijoin(args->trans->t_dfops, dp);
 		error = xfs_defer_finish(&args->trans);
 		if (error)
 			goto out_defer_cancel;
@@ -627,7 +626,6 @@ xfs_attr_rmtval_remove(
 				    XFS_BMAPI_ATTRFORK, 1, &done);
 		if (error)
 			goto out_defer_cancel;
-		xfs_defer_ijoin(args->trans->t_dfops, args->dp);
 		error = xfs_defer_finish(&args->trans);
 		if (error)
 			goto out_defer_cancel;

fs/xfs/libxfs/xfs_bmap.c

@@ -1119,7 +1119,6 @@ xfs_bmap_add_attrfork(
 			xfs_log_sb(tp);
 	}
 
-	xfs_defer_ijoin(tp->t_dfops, ip);
 	error = xfs_trans_commit(tp);
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 	return error;
@@ -5987,7 +5986,6 @@ __xfs_bmap_add(
 	int				whichfork,
 	struct xfs_bmbt_irec		*bmap)
 {
-	int				error;
 	struct xfs_bmap_intent		*bi;
 
 	trace_xfs_bmap_defer(mp,
@@ -6006,12 +6004,6 @@ __xfs_bmap_add(
 	bi->bi_whichfork = whichfork;
 	bi->bi_bmap = *bmap;
 
-	error = xfs_defer_ijoin(dfops, bi->bi_owner);
-	if (error) {
-		kmem_free(bi);
-		return error;
-	}
-
 	xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
 	return 0;
 }

fs/xfs/libxfs/xfs_defer.c

@@ -15,6 +15,8 @@
 #include "xfs_defer.h"
 #include "xfs_trans.h"
 #include "xfs_buf_item.h"
+#include "xfs_inode.h"
+#include "xfs_inode_item.h"
 #include "xfs_trace.h"
 
 /*
@@ -230,16 +232,14 @@ xfs_defer_trans_roll(
 {
 	struct xfs_defer_ops		*dop = (*tp)->t_dfops;
 	struct xfs_buf_log_item		*bli;
+	struct xfs_inode_log_item	*ili;
 	struct xfs_log_item		*lip;
 	struct xfs_buf			*bplist[XFS_DEFER_OPS_NR_BUFS];
-	int				bpcount = 0;
+	struct xfs_inode		*iplist[XFS_DEFER_OPS_NR_INODES];
+	int				bpcount = 0, ipcount = 0;
 	int				i;
 	int				error;
 
-	/* Log all the joined inodes. */
-	for (i = 0; i < XFS_DEFER_OPS_NR_INODES && dop->dop_inodes[i]; i++)
-		xfs_trans_log_inode(*tp, dop->dop_inodes[i], XFS_ILOG_CORE);
-
 	list_for_each_entry(lip, &(*tp)->t_items, li_trans) {
 		switch (lip->li_type) {
 		case XFS_LI_BUF:
@@ -254,6 +254,19 @@ xfs_defer_trans_roll(
 				bplist[bpcount++] = bli->bli_buf;
 			}
 			break;
+		case XFS_LI_INODE:
+			ili = container_of(lip, struct xfs_inode_log_item,
+					   ili_item);
+			if (ili->ili_lock_flags == 0) {
+				if (ipcount >= XFS_DEFER_OPS_NR_INODES) {
+					ASSERT(0);
+					return -EFSCORRUPTED;
+				}
+				xfs_trans_log_inode(*tp, ili->ili_inode,
+						    XFS_ILOG_CORE);
+				iplist[ipcount++] = ili->ili_inode;
+			}
+			break;
 		default:
 			break;
 		}
@@ -271,8 +284,8 @@ xfs_defer_trans_roll(
 	}
 
 	/* Rejoin the joined inodes. */
-	for (i = 0; i < XFS_DEFER_OPS_NR_INODES && dop->dop_inodes[i]; i++)
-		xfs_trans_ijoin(*tp, dop->dop_inodes[i], 0);
+	for (i = 0; i < ipcount; i++)
+		xfs_trans_ijoin(*tp, iplist[i], 0);
 
 	/* Rejoin the buffers and dirty them so the log moves forward. */
 	for (i = 0; i < bpcount; i++) {
@@ -291,30 +304,6 @@ xfs_defer_has_unfinished_work(
 	return !list_empty(&dop->dop_pending) || !list_empty(&dop->dop_intake);
 }
 
-/*
- * Add this inode to the deferred op.  Each joined inode is relogged
- * each time we roll the transaction.
- */
-int
-xfs_defer_ijoin(
-	struct xfs_defer_ops		*dop,
-	struct xfs_inode		*ip)
-{
-	int				i;
-
-	for (i = 0; i < XFS_DEFER_OPS_NR_INODES; i++) {
-		if (dop->dop_inodes[i] == ip)
-			return 0;
-		else if (dop->dop_inodes[i] == NULL) {
-			dop->dop_inodes[i] = ip;
-			return 0;
-		}
-	}
-
-	ASSERT(0);
-	return -EFSCORRUPTED;
-}
-
 /*
  * Reset an already used dfops after finish.
  */
@@ -322,11 +311,7 @@ static void
 xfs_defer_reset(
 	struct xfs_trans	*tp)
 {
-	struct xfs_defer_ops	*dop = tp->t_dfops;
-
-	ASSERT(!xfs_defer_has_unfinished_work(dop));
-
-	memset(dop->dop_inodes, 0, sizeof(dop->dop_inodes));
+	ASSERT(!xfs_defer_has_unfinished_work(tp->t_dfops));
 
 	/*
 	 * Low mode state transfers across transaction rolls to mirror dfops
@@ -588,8 +573,6 @@ xfs_defer_move(
 	list_splice_init(&src->dop_intake, &dst->dop_intake);
 	list_splice_init(&src->dop_pending, &dst->dop_pending);
 
-	memcpy(dst->dop_inodes, src->dop_inodes, sizeof(dst->dop_inodes));
-
 	/*
 	 * Low free space mode was historically controlled by a dfops field.
 	 * This meant that low mode state potentially carried across multiple

fs/xfs/libxfs/xfs_defer.h

@@ -42,7 +42,6 @@ int xfs_defer_finish(struct xfs_trans **tp);
 void xfs_defer_cancel(struct xfs_trans *);
 void xfs_defer_init(struct xfs_trans *tp, struct xfs_defer_ops *dop);
 bool xfs_defer_has_unfinished_work(struct xfs_defer_ops *dop);
-int xfs_defer_ijoin(struct xfs_defer_ops *dop, struct xfs_inode *ip);
 void xfs_defer_move(struct xfs_trans *dtp, struct xfs_trans *stp);
 
 /* Description of a deferred type. */

fs/xfs/xfs_bmap_util.c

@@ -979,7 +979,6 @@ xfs_alloc_file_space(
 		/*
 		 * Complete the transaction
 		 */
-		xfs_defer_ijoin(tp->t_dfops, ip);
 		error = xfs_trans_commit(tp);
 		xfs_iunlock(ip, XFS_ILOCK_EXCL);
 		if (error)
@@ -1037,8 +1036,6 @@ xfs_unmap_extent(
 	if (error)
 		goto out_trans_cancel;
 
-	xfs_defer_ijoin(tp->t_dfops, ip);
-
 	error = xfs_trans_commit(tp);
 out_unlock:
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
@@ -1624,7 +1621,6 @@ xfs_swap_extent_rmap(
 			if (error)
 				goto out_defer;
 
-			xfs_defer_ijoin(tp->t_dfops, ip);
 			error = xfs_defer_finish(tpp);
 			tp = *tpp;
 			if (error)

fs/xfs/xfs_inode.c

@@ -1569,7 +1569,6 @@ xfs_itruncate_extents_flags(
 		 * Duplicate the transaction that has the permanent
 		 * reservation and commit the old transaction.
 		 */
-		xfs_defer_ijoin(tp->t_dfops, ip);
 		error = xfs_defer_finish(&tp);
 		if (error)
 			goto out_bmap_cancel;
@@ -1810,7 +1809,6 @@ xfs_inactive_ifree(
 	 * Just ignore errors at this point.  There is nothing we can do except
 	 * to try to keep going. Make sure it's not a silent error.
 	 */
-	xfs_defer_ijoin(tp->t_dfops, ip);
 	error = xfs_trans_commit(tp);
 	if (error)
 		xfs_notice(mp, "%s: xfs_trans_commit returned error %d",

fs/xfs/xfs_iomap.c

@@ -261,7 +261,6 @@ xfs_iomap_write_direct(
 	/*
 	 * Complete the transaction
 	 */
-	xfs_defer_ijoin(tp->t_dfops, ip);
 	error = xfs_trans_commit(tp);
 	if (error)
 		goto out_unlock;
@@ -764,7 +763,6 @@ xfs_iomap_write_allocate(
 			if (error)
 				goto trans_cancel;
 
-			xfs_defer_ijoin(tp->t_dfops, ip);
 			error = xfs_trans_commit(tp);
 			if (error)
 				goto error0;
@@ -884,7 +882,6 @@ xfs_iomap_write_unwritten(
 			xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 		}
 
-		xfs_defer_ijoin(tp->t_dfops, ip);
 		error = xfs_trans_commit(tp);
 		xfs_iunlock(ip, XFS_ILOCK_EXCL);
 		if (error)

fs/xfs/xfs_reflink.c

@@ -435,7 +435,6 @@ xfs_reflink_allocate_cow(
 	xfs_inode_set_cowblocks_tag(ip);
 
 	/* Finish up. */
-	xfs_defer_ijoin(tp->t_dfops, ip);
 	error = xfs_trans_commit(tp);
 	if (error)
 		return error;
@@ -518,7 +517,6 @@ xfs_reflink_cancel_cow_blocks(
 					NULL);
 
 			/* Roll the transaction */
-			xfs_defer_ijoin((*tpp)->t_dfops, ip);
 			error = xfs_defer_finish(tpp);
 			if (error) {
 				xfs_defer_cancel(*tpp);
@@ -716,7 +714,6 @@ xfs_reflink_end_cow(
 		/* Remove the mapping from the CoW fork. */
 		xfs_bmap_del_extent_cow(ip, &icur, &got, &del);
 
-		xfs_defer_ijoin(tp->t_dfops, ip);
 		error = xfs_defer_finish(&tp);
 		if (error)
 			goto out_cancel;
@@ -1077,7 +1074,6 @@ xfs_reflink_remap_extent(
 
 next_extent:
 		/* Process all the deferred stuff. */
-		xfs_defer_ijoin(tp->t_dfops, ip);
 		error = xfs_defer_finish(&tp);
 		if (error)
 			goto out_cancel;

fs/xfs/xfs_symlink.c

@@ -454,7 +454,6 @@ xfs_inactive_symlink_rmt(
 	 * Commit the transaction. This first logs the EFI and the inode, then
 	 * rolls and commits the transaction that frees the extents.
 	 */
-	xfs_defer_ijoin(tp->t_dfops, ip);
 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 	error = xfs_trans_commit(tp);
 	if (error) {

fs/xfs/xfs_trans.h

@@ -97,9 +97,6 @@ void	xfs_log_item_init(struct xfs_mount *mp, struct xfs_log_item *item,
 struct xfs_defer_ops {
 	struct list_head	dop_intake;	/* unlogged pending work */
 	struct list_head	dop_pending;	/* logged pending work */
-
-	/* relog these with each roll */
-	struct xfs_inode	*dop_inodes[XFS_DEFER_OPS_NR_INODES];
 };
 
 /*