[Fwd: [PATCH] rename bug patch]

[Fwd: [PATCH] rename bug patch]

[Hans Reiser]

[-- Attachment #1: Type: text/plain, Size: 128 bytes --]

Others besides Marcelo are likely to be interested in this.  I think 
this might be the fix to a longtime eluding us bug.

Hans

[-- Attachment #2: [PATCH] rename bug patch --]
[-- Type: message/rfc822, Size: 4077 bytes --]

From: Hans Reiser <reiser@namesys.com>
To: Marcelo Tosatti <marcelo@conectiva.com.br>
Subject: [PATCH] rename bug patch
Date: Fri, 18 Jan 2002 14:41:10 +0300
Message-ID: <3C4809D6.8040908@namesys.com>

Please apply and credit Oleg.  It is tested by three persons and read/reviewed by Saveliev, so it should be good.

Hans



Hello!

     A-rename_stale_item_bug-1.diff
     This patch fixes 2 bugs in reiserfs_rename(). First one being attempt to access item before verifying it was
     not moved since last access. Second is a window, where old filename may be written to disk with 'visible'
     flag unset without these changes be journaled.

Bye,
     Oleg

--- linux/fs/reiserfs/namei.c.orig	Thu Jan 17 14:05:11 2002
+++ linux/fs/reiserfs/namei.c	Thu Jan 17 17:09:23 2002
@@ -1057,7 +1057,7 @@
      INITIALIZE_PATH (old_entry_path);
      INITIALIZE_PATH (new_entry_path);
      INITIALIZE_PATH (dot_dot_entry_path);
-    struct item_head new_entry_ih, old_entry_ih ;
+    struct item_head new_entry_ih, old_entry_ih, dot_dot_ih ;
      struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
      struct inode * old_inode, * new_inode;
      int windex ;
@@ -1151,6 +1151,8 @@

  	copy_item_head(&old_entry_ih, get_ih(&old_entry_path)) ;

+ 
reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1) ;
+
  	// look for new name by reiserfs_find_entry
  	new_de.de_gen_number_bit_string = 0;
  	retval = reiserfs_find_entry (new_dir, new_dentry->d_name.name, new_dentry->d_name.len,
@@ -1167,6 +1169,7 @@
  	if (S_ISDIR(old_inode->i_mode)) {
  	    if (search_by_entry_key (new_dir->i_sb, &dot_dot_de.de_entry_key, &dot_dot_entry_path, &dot_dot_de) != NAME_FOUND)
  		BUG ();
+ 
     copy_item_head(&dot_dot_ih, get_ih(&dot_dot_entry_path)) ;
  	    // node containing ".." gets into transaction
  	    reiserfs_prepare_for_journal(old_inode->i_sb, dot_dot_de.de_bh, 1) ;
  	}
@@ -1183,23 +1186,33 @@
  	** of the above checks could have scheduled.  We have to be
  	** sure our items haven't been shifted by another process.
  	*/
- 
if (!entry_points_to_object(new_dentry->d_name.name,
+ 
if (item_moved(&new_entry_ih, &new_entry_path) ||
+ 
     !entry_points_to_object(new_dentry->d_name.name,
  	                            new_dentry->d_name.len,
  	 
		    &new_de, new_inode) ||
- 
     item_moved(&new_entry_ih, &new_entry_path) ||
  	    item_moved(&old_entry_ih, &old_entry_path) ||
  	    !entry_points_to_object (old_dentry->d_name.name,
  	                             old_dentry->d_name.len,
  	 
		     &old_de, old_inode)) {
  	    reiserfs_restore_prepared_buffer (old_inode->i_sb, new_de.de_bh);
+ 
     reiserfs_restore_prepared_buffer (old_inode->i_sb, old_de.de_bh);
  	    if (S_ISDIR(old_inode->i_mode))
  		reiserfs_restore_prepared_buffer (old_inode->i_sb, dot_dot_de.de_bh);
  	    continue;
  	}
+ 
if (S_ISDIR(old_inode->i_mode)) {
+ 
     if ( item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
+ 
	 !entry_points_to_object ( "..", 2, &dot_dot_de, old_dir) ) {
+ 
	reiserfs_restore_prepared_buffer (old_inode->i_sb, old_de.de_bh);
+ 
	reiserfs_restore_prepared_buffer (old_inode->i_sb, new_de.de_bh);
+ 
	reiserfs_restore_prepared_buffer (old_inode->i_sb, dot_dot_de.de_bh);
+ 
	continue;
+ 
     }
+ 
}
+

  	RFALSE( S_ISDIR(old_inode->i_mode) &&
- 
	(!entry_points_to_object ("..", 2, &dot_dot_de, old_dir) ||
- 
	 !reiserfs_buffer_prepared(dot_dot_de.de_bh)), "" );
+ 
	!reiserfs_buffer_prepared(dot_dot_de.de_bh), "" );

  	break;
      }
@@ -1212,6 +1225,7 @@
      journal_mark_dirty (&th, old_dir->i_sb, new_de.de_bh);

      mark_de_hidden (old_de.de_deh + old_de.de_entry_num);
+    journal_mark_dirty (&th, old_dir->i_sb, old_de.de_bh);
      old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
      new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME;