GIT: unionfs2-2.6.27.y: Unionfs: lock parent dentry branch config in write

[Erez Zadok]

commit aaf49dc38bec4d0c967f4aeacd236cac475debbf
Author: Erez Zadok <ezk at cs.sunysb.edu>
Date:   Wed Apr 23 19:05:59 2008 -0400

    Unionfs: lock parent dentry branch config in write
    
    Ensure that branch configuration is available to file_revalidate should a
    copyup be required.
    
    Signed-off-by: Erez Zadok <ezk at cs.sunysb.edu>

diff --git a/fs/unionfs/file.c b/fs/unionfs/file.c
index 09f594d..9b5fc58 100644
--- a/fs/unionfs/file.c
+++ b/fs/unionfs/file.c
@@ -55,7 +55,9 @@ static ssize_t unionfs_write(struct file *file, const char __user *buf,
 
 	unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_PARENT);
 	unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
-	err = unionfs_file_revalidate(file, true);
+	if (dentry != dentry->d_parent)
+		unionfs_lock_dentry(dentry->d_parent, UNIONFS_DMUTEX_PARENT);
+	err = unionfs_file_revalidate_locked(file, true);
 	if (unlikely(err))
 		goto out;
 
@@ -72,6 +74,8 @@ static ssize_t unionfs_write(struct file *file, const char __user *buf,
 	}
 
 out:
+	if (dentry != dentry->d_parent)
+		unionfs_unlock_dentry(dentry->d_parent);
 	unionfs_unlock_dentry(dentry);
 	unionfs_read_unlock(dentry->d_sb);
 	return err;