linux-kernel - [PATCH 3.4 15/92] eCryptfs: Invalidate dcache entries when lower i

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Date:	Mon, 18 Apr 2016 18:45:20 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Tyler Hicks <tyhicks@...onical.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 15/92] eCryptfs: Invalidate dcache entries when lower i_nlink is zero

From: Tyler Hicks <tyhicks@...onical.com>

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 5556e7e6d30e8e9b5ee51b0e5edd526ee80e5e36 upstream.

Consider eCryptfs dcache entries to be stale when the corresponding
lower inode's i_nlink count is zero. This solves a problem caused by the
lower inode being directly modified, without going through the eCryptfs
mount, leaving stale eCryptfs dentries cached and the eCryptfs inode's
i_nlink count not being cleared.

Signed-off-by: Tyler Hicks <tyhicks@...onical.com>
Reported-by: Richard Weinberger <richard@....at>
[bwh: Backported to 3.2:
 - Test d_revalidate pointer directly rather than a DCACHE_OP flag
 - Open-code d_inode()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 fs/ecryptfs/dentry.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/fs/ecryptfs/dentry.c b/fs/ecryptfs/dentry.c
index 534c1d4..eba8f1d 100644
--- a/fs/ecryptfs/dentry.c
+++ b/fs/ecryptfs/dentry.c
@@ -55,26 +55,26 @@ static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
 
 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
 	lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
-	if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
-		goto out;
-	if (nd) {
-		dentry_save = nd->path.dentry;
-		vfsmount_save = nd->path.mnt;
-		nd->path.dentry = lower_dentry;
-		nd->path.mnt = lower_mnt;
-	}
-	rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
-	if (nd) {
-		nd->path.dentry = dentry_save;
-		nd->path.mnt = vfsmount_save;
+	if (lower_dentry->d_op && lower_dentry->d_op->d_revalidate) {
+		if (nd) {
+			dentry_save = nd->path.dentry;
+			vfsmount_save = nd->path.mnt;
+			nd->path.dentry = lower_dentry;
+			nd->path.mnt = lower_mnt;
+		}
+		rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
+		if (nd) {
+			nd->path.dentry = dentry_save;
+			nd->path.mnt = vfsmount_save;
+		}
 	}
 	if (dentry->d_inode) {
-		struct inode *lower_inode =
-			ecryptfs_inode_to_lower(dentry->d_inode);
+		struct inode *inode = dentry->d_inode;
 
-		fsstack_copy_attr_all(dentry->d_inode, lower_inode);
+		fsstack_copy_attr_all(inode, ecryptfs_inode_to_lower(inode));
+		if (!inode->i_nlink)
+			return 0;
 	}
-out:
 	return rc;
 }
 
-- 
1.9.1