xfs: simplify inode to transaction joining

Currently we need to either call IHOLD or xfs_trans_ihold on an inode when
joining it to a transaction via xfs_trans_ijoin.

This patches instead makes xfs_trans_ijoin usable on it's own by doing
an implicity xfs_trans_ihold, which also allows us to drop the third
argument.  For the case where we want to hold a reference on the inode
a xfs_trans_ijoin_ref wrapper is added which does the IHOLD and marks
the inode for needing an xfs_iput.  In addition to the cleaner interface
to the caller this also simplifies the implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

1 files changed, 24 insertions, 36 deletions

diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c
index 865eeb63ce1..cdc53a1050c 100644
--- a/fs/xfs/xfs_trans_inode.c
+++ b/fs/xfs/xfs_trans_inode.c
@@ -33,6 +33,7 @@
 #include "xfs_btree.h"
 #include "xfs_trans_priv.h"
 #include "xfs_inode_item.h"
+#include "xfs_trace.h"
 
 #ifdef XFS_TRANS_DEBUG
 STATIC void
@@ -42,7 +43,6 @@ xfs_trans_inode_broot_debug(
 #define	xfs_trans_inode_broot_debug(ip)
 #endif
 
-
 /*
  * Get an inode and join it to the transaction.
  */
@@ -58,32 +58,31 @@ xfs_trans_iget(
 	int			error;
 
 	error = xfs_iget(mp, tp, ino, flags, lock_flags, ipp);
-	if (!error && tp)
-		xfs_trans_ijoin(tp, *ipp, lock_flags);
+	if (!error && tp) {
+		xfs_trans_ijoin(tp, *ipp);
+		(*ipp)->i_itemp->ili_lock_flags = lock_flags;
+	}
 	return error;
 }
 
 /*
- * Add the locked inode to the transaction.
- * The inode must be locked, and it cannot be associated with any
- * transaction.  The caller must specify the locks already held
- * on the inode.
+ * Add a locked inode to the transaction.
+ *
+ * The inode must be locked, and it cannot be associated with any transaction.
  */
 void
 xfs_trans_ijoin(
-	xfs_trans_t	*tp,
-	xfs_inode_t	*ip,
-	uint		lock_flags)
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip)
 {
 	xfs_inode_log_item_t	*iip;
 
 	ASSERT(ip->i_transp == NULL);
 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
-	ASSERT(lock_flags & XFS_ILOCK_EXCL);
 	if (ip->i_itemp == NULL)
 		xfs_inode_item_init(ip, ip->i_mount);
 	iip = ip->i_itemp;
-	ASSERT(iip->ili_flags == 0);
+	ASSERT(iip->ili_lock_flags == 0);
 
 	/*
 	 * Get a log_item_desc to point at the new item.
@@ -93,42 +92,31 @@ xfs_trans_ijoin(
 	xfs_trans_inode_broot_debug(ip);
 
 	/*
-	 * If the IO lock is already held, mark that in the inode log item.
-	 */
-	if (lock_flags & XFS_IOLOCK_EXCL) {
-		iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
-	} else if (lock_flags & XFS_IOLOCK_SHARED) {
-		iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
-	}
-
-	/*
 	 * Initialize i_transp so we can find it with xfs_inode_incore()
 	 * in xfs_trans_iget() above.
 	 */
 	ip->i_transp = tp;
 }
 
-
-
 /*
- * Mark the inode as not needing to be unlocked when the inode item's
- * IOP_UNLOCK() routine is called.  The inode must already be locked
- * and associated with the given transaction.
+ * Add a locked inode to the transaction.
+ *
+ *
+ * Grabs a reference to the inode which will be dropped when the transaction
+ * is commited.  The inode will also be unlocked at that point.  The inode
+ * must be locked, and it cannot be associated with any transaction.
  */
-/*ARGSUSED*/
 void
-xfs_trans_ihold(
-	xfs_trans_t	*tp,
-	xfs_inode_t	*ip)
+xfs_trans_ijoin_ref(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip,
+	uint			lock_flags)
 {
-	ASSERT(ip->i_transp == tp);
-	ASSERT(ip->i_itemp != NULL);
-	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
-
-	ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
+	xfs_trans_ijoin(tp, ip);
+	IHOLD(ip);
+	ip->i_itemp->ili_lock_flags = lock_flags;
 }
 
-
 /*
  * This is called to mark the fields indicated in fieldmask as needing
  * to be logged when the transaction is committed.  The inode must