ecryptfs: test lower_file pointer when lower_file_mutex is locked

This patch prevents the lower_file pointer in the 'ecryptfs_inode_info'
structure to be checked when the mutex 'lower_file_mutex' is not locked.
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>

fs/ecryptfs/file.c

@@ -191,7 +191,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 				      | ECRYPTFS_ENCRYPTED);
 	}
 	mutex_unlock(&crypt_stat->cs_mutex);
-	if (!ecryptfs_inode_to_private(inode)->lower_file) {
 	rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 	if (rc) {
 		printk(KERN_ERR "%s: Error attempting to initialize "
@@ -200,7 +199,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 			ecryptfs_dentry->d_name.name, rc);
 		goto out_free;
 	}
-	}
 	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
 	    && !(file->f_flags & O_RDONLY)) {
 		rc = -EPERM;

fs/ecryptfs/inode.c

@@ -185,7 +185,6 @@ static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 				"context; rc = [%d]\n", rc);
 		goto out;
 	}
-	if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 	rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 	if (rc) {
 		printk(KERN_ERR "%s: Error attempting to initialize "
@@ -194,7 +193,6 @@ static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 			ecryptfs_dentry->d_name.name, rc);
 		goto out;
 	}
-	}
 	rc = ecryptfs_write_metadata(ecryptfs_dentry);
 	if (rc) {
 		printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
@@ -302,7 +300,6 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 		rc = -ENOMEM;
 		goto out;
 	}
-	if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 	rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 	if (rc) {
 		printk(KERN_ERR "%s: Error attempting to initialize "
@@ -311,7 +308,6 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 			ecryptfs_dentry->d_name.name, rc);
 		goto out_free_kmem;
 	}
-	}
 	crypt_stat = &ecryptfs_inode_to_private(
 					ecryptfs_dentry->d_inode)->crypt_stat;
 	/* TODO: lock for crypt_stat comparison */