From: Erez Zadok <ezk@cs.sunysb.edu>
Date: Tue, 6 Sep 2011 01:16:06 +0000 (-0400)
Subject: Unionfs: find lower inode of unlinked opened files in setattr
X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=1b901bb44846fb88d1d6a0faee6972b6d1a9a3ce;p=unionfs-2.6.36.y.git

Unionfs: find lower inode of unlinked opened files in setattr

To find the inode of a lower file that's open but unlinked, we cannot find
it via unionfs_lower_inode as that's NULL; but we can get it properly from
lower_dentry->d_inode.

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---

diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index eb03b9b1c33..74b0eadb421 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -933,7 +933,12 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
 		err = -EINVAL;
 		goto out;
 	}
-	lower_inode = unionfs_lower_inode(inode);
+
+	/*
+	 * Get the lower inode directly from lower dentry, in case ibstart
+	 * is -1 (which happens when the file is open but unlinked.
+	 */
+	lower_inode = lower_dentry->d_inode;
 
 	/* check if user has permission to change lower inode */
 	err = inode_change_ok(lower_inode, ia);