ecryptfs: Remove unnecessary variable initialization

Removes unneeded variable initialization in ecryptfs_read_metadata(). Also adds
a small comment to help explain metadata reading logic.

[tyhicks@canonical.com: Pulled out of for-stable patch and wrote commit msg]
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 2bf5203..ff98150 100644 (file)
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1590,8 +1590,8 @@ int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
  */
 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
 {
-       int rc = 0;
-       char *page_virt = NULL;
+       int rc;
+       char *page_virt;
        struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
        struct ecryptfs_crypt_stat *crypt_stat =
            &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
@@ -1616,6 +1616,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
                                                ecryptfs_dentry,
                                                ECRYPTFS_VALIDATE_HEADER_SIZE);
        if (rc) {
+               /* metadata is not in the file header, so try xattrs */
                memset(page_virt, 0, PAGE_CACHE_SIZE);
                rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_inode);
                if (rc) {