linux-kernel - [PATCH] [135/275] eCryptfs: Copy up lower inode attrs in getattr

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Date:	Wed, 30 Mar 2011 14:06:15 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	tyhicks@...ux.vnet.ibm.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [135/275] eCryptfs: Copy up lower inode attrs in getattr

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>

commit 55f9cf6bbaa682958a7dd2755f883b768270c3ce upstream.

The lower filesystem may do some type of inode revalidation during a
getattr call. eCryptfs should take advantage of that by copying the
lower inode attributes to the eCryptfs inode after a call to
vfs_getattr() on the lower inode.

I originally wrote this fix while working on eCryptfs on nfsv3 support,
but discovered it also fixed an eCryptfs on ext4 nanosecond timestamp
bug that was reported.

https://bugs.launchpad.net/bugs/613873

Signed-off-by: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/ecryptfs/inode.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6.35.y/fs/ecryptfs/inode.c
===================================================================
--- linux-2.6.35.y.orig/fs/ecryptfs/inode.c	2011-03-29 22:51:13.546376551 -0700
+++ linux-2.6.35.y/fs/ecryptfs/inode.c	2011-03-29 23:03:01.080272529 -0700
@@ -1003,6 +1003,8 @@
 	rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
 			 ecryptfs_dentry_to_lower(dentry), &lower_stat);
 	if (!rc) {
+		fsstack_copy_attr_all(dentry->d_inode,
+				      ecryptfs_inode_to_lower(dentry->d_inode));
 		generic_fillattr(dentry->d_inode, stat);
 		stat->blocks = lower_stat.blocks;
 	}
--
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