eCryptfs: Remove unused ecryptfs_read()

ecryptfs_read() has been ifdef'ed out for years now and it was
apparently unused before then. It is time to get rid of it for good.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index 608c1c3..5c0106f 100644 (file)
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -282,76 +282,3 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
        flush_dcache_page(page_for_ecryptfs);
        return rc;
 }
-
-#if 0
-/**
- * ecryptfs_read
- * @data: The virtual address into which to write the data read (and
- *        possibly decrypted) from the lower file
- * @offset: The offset in the decrypted view of the file from which to
- *          read into @data
- * @size: The number of bytes to read into @data
- * @ecryptfs_file: The eCryptfs file from which to read
- *
- * Read an arbitrary amount of data from an arbitrary location in the
- * eCryptfs page cache. This is done on an extent-by-extent basis;
- * individual extents are decrypted and read from the lower page
- * cache (via VFS reads). This function takes care of all the
- * address translation to locations in the lower filesystem.
- *
- * Returns zero on success; non-zero otherwise
- */
-int ecryptfs_read(char *data, loff_t offset, size_t size,
-                 struct file *ecryptfs_file)
-{
-       struct inode *ecryptfs_inode = ecryptfs_file->f_dentry->d_inode;
-       struct page *ecryptfs_page;
-       char *ecryptfs_page_virt;
-       loff_t ecryptfs_file_size = i_size_read(ecryptfs_inode);
-       loff_t data_offset = 0;
-       loff_t pos;
-       int rc = 0;
-
-       if ((offset + size) > ecryptfs_file_size) {
-               rc = -EINVAL;
-               printk(KERN_ERR "%s: Attempt to read data past the end of the "
-                       "file; offset = [%lld]; size = [%td]; "
-                      "ecryptfs_file_size = [%lld]\n",
-                      __func__, offset, size, ecryptfs_file_size);
-               goto out;
-       }
-       pos = offset;
-       while (pos < (offset + size)) {
-               pgoff_t ecryptfs_page_idx = (pos >> PAGE_CACHE_SHIFT);
-               size_t start_offset_in_page = (pos & ~PAGE_CACHE_MASK);
-               size_t num_bytes = (PAGE_CACHE_SIZE - start_offset_in_page);
-               size_t total_remaining_bytes = ((offset + size) - pos);
-
-               if (num_bytes > total_remaining_bytes)
-                       num_bytes = total_remaining_bytes;
-               ecryptfs_page = ecryptfs_get_locked_page(ecryptfs_inode,
-                                                        ecryptfs_page_idx);
-               if (IS_ERR(ecryptfs_page)) {
-                       rc = PTR_ERR(ecryptfs_page);
-                       printk(KERN_ERR "%s: Error getting page at "
-                              "index [%ld] from eCryptfs inode "
-                              "mapping; rc = [%d]\n", __func__,
-                              ecryptfs_page_idx, rc);
-                       goto out;
-               }
-               ecryptfs_page_virt = kmap_atomic(ecryptfs_page, KM_USER0);
-               memcpy((data + data_offset),
-                      ((char *)ecryptfs_page_virt + start_offset_in_page),
-                      num_bytes);
-               kunmap_atomic(ecryptfs_page_virt, KM_USER0);
-               flush_dcache_page(ecryptfs_page);
-               SetPageUptodate(ecryptfs_page);
-               unlock_page(ecryptfs_page);
-               page_cache_release(ecryptfs_page);
-               pos += num_bytes;
-               data_offset += num_bytes;
-       }
-out:
-       return rc;
-}
-#endif  /*  0  */