From 35f1a0a133dc131cd889a3f8a3dd812d762d32f9 Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Tue, 16 Jul 1996 01:37:07 +0000
Subject: (diskfs_rename_dir): When unlocking FDP, only do it if we FDP != TDP.
 Also, only do step two (changing .. in the directory being moved) if FDP !=
 TDP.

---
 libdiskfs/dir-renamed.c | 62 ++++++++++++++++++++++++++-----------------------
 1 file changed, 33 insertions(+), 29 deletions(-)

(limited to 'libdiskfs/dir-renamed.c')

diff --git a/libdiskfs/dir-renamed.c b/libdiskfs/dir-renamed.c
index 1aa12ef3..6ef96ee3 100644
--- a/libdiskfs/dir-renamed.c
+++ b/libdiskfs/dir-renamed.c
@@ -100,7 +100,8 @@ diskfs_rename_dir (struct node *fdp, struct node *fnp, char *fromname,
       diskfs_drop_dirstat (tdp, ds);
       diskfs_nrele (tnp);
       mutex_unlock (&tdp->lock);
-      mutex_unlock (&fdp->lock);
+      if (fdp != tdp)
+	mutex_unlock (&fdp->lock);
       return 0;
     }
   
@@ -119,37 +120,40 @@ diskfs_rename_dir (struct node *fdp, struct node *fnp, char *fromname,
     goto out;
 
   /* 2: Set our .. to point to the new parent */
-  if (tdp->dn_stat.st_nlink == diskfs_link_max - 1)
+  if (fdp != tdp)
     {
-      err = EMLINK;
-      return EMLINK;
-    }
-  tdp->dn_stat.st_nlink++;
-  tdp->dn_set_ctime = 1;
-  if (diskfs_synchronous)
-    diskfs_node_update (tdp, 1);
+      if (tdp->dn_stat.st_nlink == diskfs_link_max - 1)
+	{
+	  err = EMLINK;
+	  return EMLINK;
+	}
+      tdp->dn_stat.st_nlink++;
+      tdp->dn_set_ctime = 1;
+      if (diskfs_synchronous)
+	diskfs_node_update (tdp, 1);
   
-  tmpds = alloca (diskfs_dirstat_size);
-  err = diskfs_lookup (fnp, "..", RENAME | SPEC_DOTDOT, 
-		       &tmpnp, tmpds, fromcred);
-  assert (err != ENOENT);
-  assert (tmpnp == fdp);
-  if (err)
-    {
-      diskfs_drop_dirstat (fnp, tmpds);
-      goto out;
-    }
+      tmpds = alloca (diskfs_dirstat_size);
+      err = diskfs_lookup (fnp, "..", RENAME | SPEC_DOTDOT, 
+			   &tmpnp, tmpds, fromcred);
+      assert (err != ENOENT);
+      assert (tmpnp == fdp);
+      if (err)
+	{
+	  diskfs_drop_dirstat (fnp, tmpds);
+	  goto out;
+	}
 
-  err = diskfs_dirrewrite (fnp, fdp, tdp, "..", tmpds);
-  if (diskfs_synchronous)
-    diskfs_file_update (fnp, 1);
-  if (err)
-    goto out;
+      err = diskfs_dirrewrite (fnp, fdp, tdp, "..", tmpds);
+      if (diskfs_synchronous)
+	diskfs_file_update (fnp, 1);
+      if (err)
+	goto out;
   
-  fdp->dn_stat.st_nlink--;
-  fdp->dn_set_ctime = 1;
-  if (diskfs_synchronous)
-    diskfs_node_update (fdp, 1);
+      fdp->dn_stat.st_nlink--;
+      fdp->dn_set_ctime = 1;
+      if (diskfs_synchronous)
+	diskfs_node_update (fdp, 1);
+    }
 
 
   /* 3: Increment the link count on the node being moved and rewrite
@@ -214,7 +218,7 @@ diskfs_rename_dir (struct node *fdp, struct node *fnp, char *fromname,
     mutex_unlock (&tdp->lock);
   if (tnp)
     diskfs_nput (tnp);
-  if (fdp)
+  if (fdp && fdp != tdp)
     mutex_unlock (&fdp->lock);
   if (fnp)
     mutex_unlock (&fnp->lock);
-- 
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