GIT: unionfs2-2.6.27.y: Unionfs: bugfix: don't call branchget() until dentry_open succeeded

[Erez Zadok]

commit a7c80e99a8532ca03029414e3d7021a03ac76c37
Author: Erez_Zadok <ezk at cs.sunysb.edu>
Date:   Mon Jul 16 23:56:26 2007 -0400

    Unionfs: bugfix: don't call branchget() until dentry_open succeeded
    
    If dentry_open fails, we incorrectly have incremented our branch counts
    which would prevent unionfs from being unmounted (EBUSY).
    
    Signed-off-by: Erez Zadok <ezk at cs.sunysb.edu>

diff --git a/fs/unionfs/commonfops.c b/fs/unionfs/commonfops.c
index 46e5008..42678a6 100644
--- a/fs/unionfs/commonfops.c
+++ b/fs/unionfs/commonfops.c
@@ -216,7 +216,6 @@ static int open_highest_file(struct file *file, int willwrite)
 
 	dget(lower_dentry);
 	unionfs_mntget(dentry, bstart);
-	branchget(sb, bstart);
 	lower_file = dentry_open(lower_dentry,
 				 unionfs_lower_mnt_idx(dentry, bstart),
 				 file->f_flags);
@@ -224,6 +223,7 @@ static int open_highest_file(struct file *file, int willwrite)
 		err = PTR_ERR(lower_file);
 		goto out;
 	}
+	branchget(sb, bstart);
 	unionfs_set_lower_file(file, lower_file);
 	/* Fix up the position. */
 	lower_file->f_pos = file->f_pos;