jfs: clean up jfs_rename and fix out of order unlock

The end of jfs_rename(), which is also used by the error paths,
included a call to IWRITE_UNLOCK(new_ip) after labels out1, out2
and out3. If we come in through these labels, IWRITE_LOCK() has not
been called yet.

In moving that call to the correct spot, I also moved some
exceptional truncate code earlier as well, since the early error
paths don't need to deal with it, and I renamed out4: to out_tx: so
a future patch by Jan Kara doesn't need to deal with renumbering or
confusing out-of-order labels.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

1 files changed, 13 insertions, 14 deletions

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 66db7bc0ed10..f7b40370a856 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1161,7 +1161,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 rc = dtModify(tid, new_dir, &new_dname, &ino,
                               old_ip->i_ino, JFS_RENAME);
                 if (rc)
-                        goto out4;
+                        goto out_tx;
                 drop_nlink(new_ip);
                 if (S_ISDIR(new_ip->i_mode)) {
                         drop_nlink(new_ip);
@@ -1186,7 +1186,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                         if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
                                 txAbort(tid, 1);        /* Marks FS Dirty */
                                 rc = new_size;
-                                goto out4;
+                                goto out_tx;
                         }
                         tblk = tid_to_tblock(tid);
                         tblk->xflag |= COMMIT_DELETE;
@@ -1204,7 +1204,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 if (rc) {
                         jfs_err("jfs_rename didn't expect dtSearch to fail "
                                 "w/rc = %d", rc);
-                        goto out4;
+                        goto out_tx;
                 }
 
                 ino = old_ip->i_ino;
@@ -1212,7 +1212,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 if (rc) {
                         if (rc == -EIO)
                                 jfs_err("jfs_rename: dtInsert returned -EIO");
-                        goto out4;
+                        goto out_tx;
                 }
                 if (S_ISDIR(old_ip->i_mode))
                         inc_nlink(new_dir);
@@ -1227,7 +1227,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
                         rc);
                 txAbort(tid, 1);        /* Marks Filesystem dirty */
-                goto out4;
+                goto out_tx;
         }
         if (S_ISDIR(old_ip->i_mode)) {
                 drop_nlink(old_dir);
@@ -1286,7 +1286,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
         rc = txCommit(tid, ipcount, iplist, commit_flag);
 
-      out4:
+      out_tx:
         txEnd(tid);
         if (new_ip)
                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
@@ -1309,13 +1309,6 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         }
         if (new_ip && (new_ip->i_nlink == 0))
                 set_cflag(COMMIT_Nolink, new_ip);
-      out3:
-        free_UCSname(&new_dname);
-      out2:
-        free_UCSname(&old_dname);
-      out1:
-        if (new_ip && !S_ISDIR(new_ip->i_mode))
-                IWRITE_UNLOCK(new_ip);
         /*
          * Truncating the directory index table is not guaranteed.  It
          * may need to be done iteratively
@@ -1326,7 +1319,13 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
                 clear_cflag(COMMIT_Stale, old_dir);
         }
-
+        if (new_ip && !S_ISDIR(new_ip->i_mode))
+                IWRITE_UNLOCK(new_ip);
+      out3:
+        free_UCSname(&new_dname);
+      out2:
+        free_UCSname(&old_dname);
+      out1:
         jfs_info("jfs_rename: returning %d", rc);
         return rc;
 }