From: Erez Zadok <ezk@cs.sunysb.edu>
Date: Sat, 30 Apr 2011 05:33:55 +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=f6c258b153a86b418991d6b757c766135a29c68c;p=unionfs-2.6.39.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 00662387d45..0a27fab5e9f 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -936,7 +936,12 @@ 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);