Line data    Source code

       1             : // SPDX-License-Identifier: GPL-2.0
       2             : /*
       3             :  *  linux/fs/ext4/symlink.c
       4             :  *
       5             :  * Only fast symlinks left here - the rest is done by generic code. AV, 1999
       6             :  *
       7             :  * Copyright (C) 1992, 1993, 1994, 1995
       8             :  * Remy Card (card@masi.ibp.fr)
       9             :  * Laboratoire MASI - Institut Blaise Pascal
      10             :  * Universite Pierre et Marie Curie (Paris VI)
      11             :  *
      12             :  *  from
      13             :  *
      14             :  *  linux/fs/minix/symlink.c
      15             :  *
      16             :  *  Copyright (C) 1991, 1992  Linus Torvalds
      17             :  *
      18             :  *  ext4 symlink handling code
      19             :  */
      20             : 
      21             : #include <linux/fs.h>
      22             : #include <linux/namei.h>
      23             : #include "ext4.h"
      24             : #include "xattr.h"
      25             : 
      26           0 : static const char *ext4_encrypted_get_link(struct dentry *dentry,
      27             :                                            struct inode *inode,
      28             :                                            struct delayed_call *done)
      29             : {
      30           0 :         struct page *cpage = NULL;
      31           0 :         const void *caddr;
      32           0 :         unsigned int max_size;
      33           0 :         const char *paddr;
      34             : 
      35           0 :         if (!dentry)
      36           0 :                 return ERR_PTR(-ECHILD);
      37             : 
      38           0 :         if (ext4_inode_is_fast_symlink(inode)) {
      39           0 :                 caddr = EXT4_I(inode)->i_data;
      40           0 :                 max_size = sizeof(EXT4_I(inode)->i_data);
      41             :         } else {
      42           0 :                 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
      43           0 :                 if (IS_ERR(cpage))
      44           0 :                         return ERR_CAST(cpage);
      45           0 :                 caddr = page_address(cpage);
      46           0 :                 max_size = inode->i_sb->s_blocksize;
      47             :         }
      48             : 
      49           0 :         paddr = fscrypt_get_symlink(inode, caddr, max_size, done);
      50           0 :         if (cpage)
      51           0 :                 put_page(cpage);
      52             :         return paddr;
      53             : }
      54             : 
      55             : const struct inode_operations ext4_encrypted_symlink_inode_operations = {
      56             :         .get_link       = ext4_encrypted_get_link,
      57             :         .setattr        = ext4_setattr,
      58             :         .getattr        = ext4_getattr,
      59             :         .listxattr      = ext4_listxattr,
      60             : };
      61             : 
      62             : const struct inode_operations ext4_symlink_inode_operations = {
      63             :         .get_link       = page_get_link,
      64             :         .setattr        = ext4_setattr,
      65             :         .getattr        = ext4_getattr,
      66             :         .listxattr      = ext4_listxattr,
      67             : };
      68             : 
      69             : const struct inode_operations ext4_fast_symlink_inode_operations = {
      70             :         .get_link       = simple_get_link,
      71             :         .setattr        = ext4_setattr,
      72             :         .getattr        = ext4_getattr,
      73             :         .listxattr      = ext4_listxattr,
      74             : };