eCryptfs: do not try to open device files on mknod

When creating device nodes, eCryptfs needs to delay actually opening the lower
persistent file until an application tries to open.  Device handles may not be
backed by anything when they first come into existence.

[Valdis.Kletnieks@vt.edu: build fix]
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: <Valdis.Kletnieks@vt.edu}
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 7315547193ea..26090878c930 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -308,7 +308,8 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
                 d_add(dentry, NULL);
                 goto out;
         }
-        rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1);
+        rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb,
+                                ECRYPTFS_INTERPOSE_FLAG_D_ADD);
         if (rc) {
                 ecryptfs_printk(KERN_ERR, "Error interposing\n");
                 goto out_dput;
@@ -537,7 +538,8 @@ ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
         if (rc || !lower_dentry->d_inode)
                 goto out;
-        rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
+        rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb,
+                                ECRYPTFS_INTERPOSE_FLAG_DELAY_PERSISTENT_FILE);
         if (rc)
                 goto out;
         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);