[PATCH 06/15] xfs: add missing defer ijoins for held inodes

[Brian Foster <bfoster@redhat.com>]

Log items that require relogging during deferred operations
processing are explicitly joined to the associated dfops via the
xfs_defer_*join() helpers. These calls imply that the associated
object is "held" by the transaction such that when rolled, the item
can be immediately joined to a follow up transaction. For buffers,
this means the buffer remains locked and held after each roll. For
inodes, this means that the inode remains locked.

Failure to join a held item to the dfops structure means the
associated object pins the tail of the log while dfops processing
completes, because the item never relogs and is not unlocked or
released until deferred processing completes.

Currently, all buffers that are held in transactions (XFS_BLI_HOLD)
with deferred operations are explicitly joined to the dfops. This is
not the case for inodes, however, as various contexts defer
operations to transactions with held inodes without explicit joins
to the associated dfops (and thus not relogging).

While this is not a catastrophic problem, it is not ideal. Given
that we want to eventually relog such items automatically during
dfops processing, start by explicitly adding these missing
xfs_defer_ijoin() calls. A call is added everywhere an inode is
joined to a transaction without transferring lock ownership and
said transaction runs deferred operations.

All xfs_defer_ijoin() calls will eventually be replaced by automatic
dfops inode relogging. This patch essentially implements the
behavior change that would otherwise occur due to automatic inode
dfops relogging.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/libxfs/xfs_bmap.c | 1 +
 fs/xfs/xfs_bmap_util.c   | 1 +
 fs/xfs/xfs_inode.c       | 1 +
 fs/xfs/xfs_iomap.c       | 3 +++
 fs/xfs/xfs_reflink.c     | 1 +
 5 files changed, 7 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 8edf7522aaff..71687d805f79 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -1119,6 +1119,7 @@ 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;
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 412dc58ae54d..0c58a66b39e5 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -979,6 +979,7 @@ 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)
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 5fc1815c2b62..441c8593cfd7 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1810,6 +1810,7 @@ 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",
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 8e8ca9f03f0e..464b4b3225bb 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -261,6 +261,7 @@ xfs_iomap_write_direct(
 	/*
 	 * Complete the transaction
 	 */
+	xfs_defer_ijoin(tp->t_dfops, ip);
 	error = xfs_trans_commit(tp);
 	if (error)
 		goto out_unlock;
@@ -762,6 +763,7 @@ 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;
@@ -879,6 +881,7 @@ 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)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 9a0a56526266..e986fcf928e5 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -435,6 +435,7 @@ 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;
-- 
2.17.1