linux-kernel - [PATCH 11/16] Unionfs: update times in setattr

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Message-Id: <11960954582192-git-send-email-ezk@cs.sunysb.edu>
Date:	Mon, 26 Nov 2007 11:44:08 -0500
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 11/16] Unionfs: update times in setattr

Needed to maintain Unix semantics via utimes(2).

Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/inode.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index ef61d9c..63ff3d3 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -1090,6 +1090,18 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
 	/* get the size from the first lower inode */
 	lower_inode = unionfs_lower_inode(inode);
 	unionfs_copy_attr_all(inode, lower_inode);
+	/*
+	 * unionfs_copy_attr_all will copy the lower times to our inode if
+	 * the lower ones are newer (useful for cache coherency).  However,
+	 * ->setattr is the only place in which we may have to copy the
+	 * lower inode times absolutely, to support utimes(2).
+	 */
+	if (ia->ia_valid & ATTR_MTIME_SET)
+		inode->i_mtime = lower_inode->i_mtime;
+	if (ia->ia_valid & ATTR_CTIME)
+		inode->i_ctime = lower_inode->i_ctime;
+	if (ia->ia_valid & ATTR_ATIME_SET)
+		inode->i_atime = lower_inode->i_atime;
 	fsstack_copy_inode_size(inode, lower_inode);
 	/* if setattr succeeded, then parent dir may have changed */
 	unionfs_copy_attr_times(dentry->d_parent->d_inode);
-- 
1.5.2.2

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