1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/fs/ext4/symlink.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Only fast symlinks left here - the rest is done by generic code. AV, 1999
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (C) 1992, 1993, 1994, 1995
8*4882a593Smuzhiyun * Remy Card (card@masi.ibp.fr)
9*4882a593Smuzhiyun * Laboratoire MASI - Institut Blaise Pascal
10*4882a593Smuzhiyun * Universite Pierre et Marie Curie (Paris VI)
11*4882a593Smuzhiyun *
12*4882a593Smuzhiyun * from
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * linux/fs/minix/symlink.c
15*4882a593Smuzhiyun *
16*4882a593Smuzhiyun * Copyright (C) 1991, 1992 Linus Torvalds
17*4882a593Smuzhiyun *
18*4882a593Smuzhiyun * ext4 symlink handling code
19*4882a593Smuzhiyun */
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include <linux/fs.h>
22*4882a593Smuzhiyun #include <linux/namei.h>
23*4882a593Smuzhiyun #include "ext4.h"
24*4882a593Smuzhiyun #include "xattr.h"
25*4882a593Smuzhiyun
ext4_encrypted_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)26*4882a593Smuzhiyun static const char *ext4_encrypted_get_link(struct dentry *dentry,
27*4882a593Smuzhiyun struct inode *inode,
28*4882a593Smuzhiyun struct delayed_call *done)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct page *cpage = NULL;
31*4882a593Smuzhiyun const void *caddr;
32*4882a593Smuzhiyun unsigned int max_size;
33*4882a593Smuzhiyun const char *paddr;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (!dentry)
36*4882a593Smuzhiyun return ERR_PTR(-ECHILD);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun if (ext4_inode_is_fast_symlink(inode)) {
39*4882a593Smuzhiyun caddr = EXT4_I(inode)->i_data;
40*4882a593Smuzhiyun max_size = sizeof(EXT4_I(inode)->i_data);
41*4882a593Smuzhiyun } else {
42*4882a593Smuzhiyun cpage = read_mapping_page(inode->i_mapping, 0, NULL);
43*4882a593Smuzhiyun if (IS_ERR(cpage))
44*4882a593Smuzhiyun return ERR_CAST(cpage);
45*4882a593Smuzhiyun caddr = page_address(cpage);
46*4882a593Smuzhiyun max_size = inode->i_sb->s_blocksize;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun paddr = fscrypt_get_symlink(inode, caddr, max_size, done);
50*4882a593Smuzhiyun if (cpage)
51*4882a593Smuzhiyun put_page(cpage);
52*4882a593Smuzhiyun return paddr;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
ext4_encrypted_symlink_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)55*4882a593Smuzhiyun static int ext4_encrypted_symlink_getattr(const struct path *path,
56*4882a593Smuzhiyun struct kstat *stat, u32 request_mask,
57*4882a593Smuzhiyun unsigned int query_flags)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun ext4_getattr(path, stat, request_mask, query_flags);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return fscrypt_symlink_getattr(path, stat);
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun const struct inode_operations ext4_encrypted_symlink_inode_operations = {
65*4882a593Smuzhiyun .get_link = ext4_encrypted_get_link,
66*4882a593Smuzhiyun .setattr = ext4_setattr,
67*4882a593Smuzhiyun .getattr = ext4_encrypted_symlink_getattr,
68*4882a593Smuzhiyun .listxattr = ext4_listxattr,
69*4882a593Smuzhiyun };
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun const struct inode_operations ext4_symlink_inode_operations = {
72*4882a593Smuzhiyun .get_link = page_get_link,
73*4882a593Smuzhiyun .setattr = ext4_setattr,
74*4882a593Smuzhiyun .getattr = ext4_getattr,
75*4882a593Smuzhiyun .listxattr = ext4_listxattr,
76*4882a593Smuzhiyun };
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun const struct inode_operations ext4_fast_symlink_inode_operations = {
79*4882a593Smuzhiyun .get_link = simple_get_link,
80*4882a593Smuzhiyun .setattr = ext4_setattr,
81*4882a593Smuzhiyun .getattr = ext4_getattr,
82*4882a593Smuzhiyun .listxattr = ext4_listxattr,
83*4882a593Smuzhiyun };
84