Release 4.9 fs/ext4/symlink.c
/*
* linux/fs/ext4/symlink.c
*
* Only fast symlinks left here - the rest is done by generic code. AV, 1999
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/fs/minix/symlink.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* ext4 symlink handling code
*/
#include <linux/fs.h>
#include <linux/namei.h>
#include "ext4.h"
#include "xattr.h"
static const char *ext4_encrypted_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
struct fscrypt_str cstr, pstr;
struct fscrypt_symlink_data *sd;
int res;
u32 max_size = inode->i_sb->s_blocksize;
if (!dentry)
return ERR_PTR(-ECHILD);
res = fscrypt_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
if (ext4_inode_is_fast_symlink(inode)) {
caddr = (char *) EXT4_I(inode)->i_data;
max_size = sizeof(EXT4_I(inode)->i_data);
} else {
cpage = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(cpage))
return ERR_CAST(cpage);
caddr = page_address(cpage);
}
/* Symlink is encrypted */
sd = (struct fscrypt_symlink_data *)caddr;
cstr.name = sd->encrypted_path;
cstr.len = le16_to_cpu(sd->len);
if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
/* Symlink data on the disk is corrupted */
res = -EFSCORRUPTED;
goto errout;
}
res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
if (res)
goto errout;
paddr = pstr.name;
res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
if (res)
goto errout;
/* Null-terminate the name */
paddr[pstr.len] = '\0';
if (cpage)
put_page(cpage);
set_delayed_call(done, kfree_link, paddr);
return paddr;
errout:
if (cpage)
put_page(cpage);
kfree(paddr);
return ERR_PTR(res);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| theodore tso | theodore tso | 241 | 74.61% | 3 | 20.00% |
| al viro | al viro | 38 | 11.76% | 5 | 33.33% |
| jaegeuk kim | jaegeuk kim | 20 | 6.19% | 1 | 6.67% |
| dave kleikamp | dave kleikamp | 11 | 3.41% | 1 | 6.67% |
| eric biggers | eric biggers | 8 | 2.48% | 2 | 13.33% |
| kirill a. shutemov | kirill a. shutemov | 2 | 0.62% | 1 | 6.67% |
| linus torvalds | linus torvalds | 2 | 0.62% | 1 | 6.67% |
| darrick j. wong | darrick j. wong | 1 | 0.31% | 1 | 6.67% |
| Total | 323 | 100.00% | 15 | 100.00% |
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
.listxattr = ext4_listxattr,
};
const struct inode_operations ext4_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = page_get_link,
.setattr = ext4_setattr,
.listxattr = ext4_listxattr,
};
const struct inode_operations ext4_fast_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = ext4_setattr,
.listxattr = ext4_listxattr,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| theodore tso | theodore tso | 244 | 58.51% | 3 | 14.29% |
| al viro | al viro | 66 | 15.83% | 6 | 28.57% |
| dave kleikamp | dave kleikamp | 53 | 12.71% | 1 | 4.76% |
| jaegeuk kim | jaegeuk kim | 20 | 4.80% | 1 | 4.76% |
| dmitriy monakhov | dmitriy monakhov | 10 | 2.40% | 1 | 4.76% |
| eric biggers | eric biggers | 8 | 1.92% | 2 | 9.52% |
| mingming cao | mingming cao | 5 | 1.20% | 1 | 4.76% |
| tao ma | tao ma | 2 | 0.48% | 1 | 4.76% |
| linus torvalds | linus torvalds | 2 | 0.48% | 1 | 4.76% |
| kirill a. shutemov | kirill a. shutemov | 2 | 0.48% | 1 | 4.76% |
| arjan van de ven | arjan van de ven | 2 | 0.48% | 1 | 4.76% |
| christoph hellwig | christoph hellwig | 2 | 0.48% | 1 | 4.76% |
| darrick j. wong | darrick j. wong | 1 | 0.24% | 1 | 4.76% |
| Total | 417 | 100.00% | 21 | 100.00% |