eCryptfs: Fix data corruption when using ecryptfs_passthrough

[safe/jmp/linux-2.6] / fs / ecryptfs / mmap.c

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 46cec2b..5c6bab9 100644 (file)
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -449,6 +449,7 @@ int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
        struct ecryptfs_crypt_stat *crypt_stat;
 
        crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
+       BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
        if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
                return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode);
        else
@@ -490,6 +491,16 @@ static int ecryptfs_write_end(struct file *file,
                ecryptfs_printk(KERN_DEBUG, "Not a new file\n");
        ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
                        "(page w/ index = [0x%.16x], to = [%d])\n", index, to);
+       if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
+               rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page, 0,
+                                                      to);
+               if (!rc) {
+                       rc = copied;
+                       fsstack_copy_inode_size(ecryptfs_inode,
+                               ecryptfs_inode_to_lower(ecryptfs_inode));
+               }
+               goto out;
+       }
        /* Fills in zeros if 'to' goes beyond inode size */
        rc = fill_zeros_to_end_of_page(page, to);
        if (rc) {