linux-kernel - [34-longterm 114/247] eCryptfs: Copy up lower inode attrs in getattr

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Message-Id: <1308850515-15242-55-git-send-email-paul.gortmaker@windriver.com>
Date:	Thu, 23 Jun 2011 13:33:02 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Tyler Hicks <tyhicks@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 114/247] eCryptfs: Copy up lower inode attrs in getattr

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

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

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: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 fs/ecryptfs/inode.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 31c8b2f..b39e46f 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -1034,6 +1034,8 @@ int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	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;
 	}
-- 
1.7.4.4

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