mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Konstantin Komarov](/assets/img/avatar_default.png)
Added minor refactoring. Added and fixed some comments. In some places, the code has been reformatted to fit into 80 columns. clang-format-12 was used to format code according kernel's .clang-format. Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
632 lines
13 KiB
C
632 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
*
|
|
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
|
|
*
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/nls.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/posix_acl.h>
|
|
|
|
#include "debug.h"
|
|
#include "ntfs.h"
|
|
#include "ntfs_fs.h"
|
|
|
|
/*
|
|
* fill_name_de - Format NTFS_DE in @buf.
|
|
*/
|
|
int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
|
|
const struct cpu_str *uni)
|
|
{
|
|
int err;
|
|
struct NTFS_DE *e = buf;
|
|
u16 data_size;
|
|
struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1);
|
|
|
|
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
|
|
e->ref.high = fname->home.high = 0;
|
|
#endif
|
|
if (uni) {
|
|
#ifdef __BIG_ENDIAN
|
|
int ulen = uni->len;
|
|
__le16 *uname = fname->name;
|
|
const u16 *name_cpu = uni->name;
|
|
|
|
while (ulen--)
|
|
*uname++ = cpu_to_le16(*name_cpu++);
|
|
#else
|
|
memcpy(fname->name, uni->name, uni->len * sizeof(u16));
|
|
#endif
|
|
fname->name_len = uni->len;
|
|
|
|
} else {
|
|
/* Convert input string to unicode. */
|
|
err = ntfs_nls_to_utf16(sbi, name->name, name->len,
|
|
(struct cpu_str *)&fname->name_len,
|
|
NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
fname->type = FILE_NAME_POSIX;
|
|
data_size = fname_full_size(fname);
|
|
|
|
e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE));
|
|
e->key_size = cpu_to_le16(data_size);
|
|
e->flags = 0;
|
|
e->res = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ntfs_lookup - inode_operations::lookup
|
|
*/
|
|
static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
u32 flags)
|
|
{
|
|
struct ntfs_inode *ni = ntfs_i(dir);
|
|
struct cpu_str *uni = __getname();
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
if (!uni)
|
|
inode = ERR_PTR(-ENOMEM);
|
|
else {
|
|
err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
|
|
dentry->d_name.len, uni, NTFS_NAME_LEN,
|
|
UTF16_HOST_ENDIAN);
|
|
if (err < 0)
|
|
inode = ERR_PTR(err);
|
|
else {
|
|
ni_lock(ni);
|
|
inode = dir_search_u(dir, uni, NULL);
|
|
ni_unlock(ni);
|
|
}
|
|
__putname(uni);
|
|
}
|
|
|
|
/*
|
|
* Check for a null pointer
|
|
* If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL.
|
|
* This causes null pointer dereference in d_splice_alias().
|
|
*/
|
|
if (!IS_ERR_OR_NULL(inode) && !inode->i_op) {
|
|
iput(inode);
|
|
inode = ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
/*
|
|
* ntfs_create - inode_operations::create
|
|
*/
|
|
static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, bool excl)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode,
|
|
0, NULL, 0, NULL);
|
|
|
|
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
|
}
|
|
|
|
/*
|
|
* ntfs_mknod
|
|
*
|
|
* inode_operations::mknod
|
|
*/
|
|
static int ntfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev,
|
|
NULL, 0, NULL);
|
|
|
|
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
|
}
|
|
|
|
/*
|
|
* ntfs_link - inode_operations::link
|
|
*/
|
|
static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
|
|
{
|
|
int err;
|
|
struct inode *inode = d_inode(ode);
|
|
struct ntfs_inode *ni = ntfs_i(inode);
|
|
|
|
if (S_ISDIR(inode->i_mode))
|
|
return -EPERM;
|
|
|
|
if (inode->i_nlink >= NTFS_LINK_MAX)
|
|
return -EMLINK;
|
|
|
|
ni_lock_dir(ntfs_i(dir));
|
|
if (inode != dir)
|
|
ni_lock(ni);
|
|
|
|
inc_nlink(inode);
|
|
ihold(inode);
|
|
|
|
err = ntfs_link_inode(inode, de);
|
|
|
|
if (!err) {
|
|
dir->i_ctime = dir->i_mtime = inode->i_ctime =
|
|
current_time(dir);
|
|
mark_inode_dirty(inode);
|
|
mark_inode_dirty(dir);
|
|
d_instantiate(de, inode);
|
|
} else {
|
|
drop_nlink(inode);
|
|
iput(inode);
|
|
}
|
|
|
|
if (inode != dir)
|
|
ni_unlock(ni);
|
|
ni_unlock(ntfs_i(dir));
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_unlink - inode_operations::unlink
|
|
*/
|
|
static int ntfs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ntfs_inode *ni = ntfs_i(dir);
|
|
int err;
|
|
|
|
ni_lock_dir(ni);
|
|
|
|
err = ntfs_unlink_inode(dir, dentry);
|
|
|
|
ni_unlock(ni);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_symlink - inode_operations::symlink
|
|
*/
|
|
static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, const char *symname)
|
|
{
|
|
u32 size = strlen(symname);
|
|
struct inode *inode;
|
|
|
|
inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777,
|
|
0, symname, size, NULL);
|
|
|
|
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
|
}
|
|
|
|
/*
|
|
* ntfs_mkdir- inode_operations::mkdir
|
|
*/
|
|
static int ntfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode,
|
|
0, NULL, 0, NULL);
|
|
|
|
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
|
}
|
|
|
|
/*
|
|
* ntfs_rmdir - inode_operations::rmdir
|
|
*/
|
|
static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ntfs_inode *ni = ntfs_i(dir);
|
|
int err;
|
|
|
|
ni_lock_dir(ni);
|
|
|
|
err = ntfs_unlink_inode(dir, dentry);
|
|
|
|
ni_unlock(ni);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_rename - inode_operations::rename
|
|
*/
|
|
static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, struct inode *new_dir,
|
|
struct dentry *new_dentry, u32 flags)
|
|
{
|
|
int err;
|
|
struct super_block *sb = dir->i_sb;
|
|
struct ntfs_sb_info *sbi = sb->s_fs_info;
|
|
struct ntfs_inode *dir_ni = ntfs_i(dir);
|
|
struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
|
|
struct inode *inode = d_inode(dentry);
|
|
struct ntfs_inode *ni = ntfs_i(inode);
|
|
struct inode *new_inode = d_inode(new_dentry);
|
|
struct NTFS_DE *de, *new_de;
|
|
bool is_same, is_bad;
|
|
/*
|
|
* de - memory of PATH_MAX bytes:
|
|
* [0-1024) - original name (dentry->d_name)
|
|
* [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
|
|
* [2048-3072) - new name (new_dentry->d_name)
|
|
*/
|
|
static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
|
|
static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
|
|
1024);
|
|
static_assert(PATH_MAX >= 4 * 1024);
|
|
|
|
if (flags & ~RENAME_NOREPLACE)
|
|
return -EINVAL;
|
|
|
|
is_same = dentry->d_name.len == new_dentry->d_name.len &&
|
|
!memcmp(dentry->d_name.name, new_dentry->d_name.name,
|
|
dentry->d_name.len);
|
|
|
|
if (is_same && dir == new_dir) {
|
|
/* Nothing to do. */
|
|
return 0;
|
|
}
|
|
|
|
if (ntfs_is_meta_file(sbi, inode->i_ino)) {
|
|
/* Should we print an error? */
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (new_inode) {
|
|
/* Target name exists. Unlink it. */
|
|
dget(new_dentry);
|
|
ni_lock_dir(new_dir_ni);
|
|
err = ntfs_unlink_inode(new_dir, new_dentry);
|
|
ni_unlock(new_dir_ni);
|
|
dput(new_dentry);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Allocate PATH_MAX bytes. */
|
|
de = __getname();
|
|
if (!de)
|
|
return -ENOMEM;
|
|
|
|
/* Translate dentry->d_name into unicode form. */
|
|
err = fill_name_de(sbi, de, &dentry->d_name, NULL);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
if (is_same) {
|
|
/* Reuse 'de'. */
|
|
new_de = de;
|
|
} else {
|
|
/* Translate new_dentry->d_name into unicode form. */
|
|
new_de = Add2Ptr(de, 2048);
|
|
err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
ni_lock_dir(dir_ni);
|
|
ni_lock(ni);
|
|
if (dir_ni != new_dir_ni)
|
|
ni_lock_dir2(new_dir_ni);
|
|
|
|
is_bad = false;
|
|
err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
|
|
if (is_bad) {
|
|
/* Restore after failed rename failed too. */
|
|
_ntfs_bad_inode(inode);
|
|
} else if (!err) {
|
|
inode->i_ctime = dir->i_ctime = dir->i_mtime =
|
|
current_time(dir);
|
|
mark_inode_dirty(inode);
|
|
mark_inode_dirty(dir);
|
|
if (dir != new_dir) {
|
|
new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime;
|
|
mark_inode_dirty(new_dir);
|
|
}
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
ntfs_sync_inode(dir);
|
|
|
|
if (IS_DIRSYNC(new_dir))
|
|
ntfs_sync_inode(inode);
|
|
}
|
|
|
|
if (dir_ni != new_dir_ni)
|
|
ni_unlock(new_dir_ni);
|
|
ni_unlock(ni);
|
|
ni_unlock(dir_ni);
|
|
out:
|
|
__putname(de);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_atomic_open
|
|
*
|
|
* inode_operations::atomic_open
|
|
*/
|
|
static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry,
|
|
struct file *file, u32 flags, umode_t mode)
|
|
{
|
|
int err;
|
|
struct inode *inode;
|
|
struct ntfs_fnd *fnd = NULL;
|
|
struct ntfs_inode *ni = ntfs_i(dir);
|
|
struct dentry *d = NULL;
|
|
struct cpu_str *uni = __getname();
|
|
bool locked = false;
|
|
|
|
if (!uni)
|
|
return -ENOMEM;
|
|
|
|
err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
|
|
dentry->d_name.len, uni, NTFS_NAME_LEN,
|
|
UTF16_HOST_ENDIAN);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
|
|
if (IS_POSIXACL(dir)) {
|
|
/*
|
|
* Load in cache current acl to avoid ni_lock(dir):
|
|
* ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
|
|
* ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
|
|
*/
|
|
struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
|
|
|
|
if (IS_ERR(p)) {
|
|
err = PTR_ERR(p);
|
|
goto out;
|
|
}
|
|
posix_acl_release(p);
|
|
}
|
|
#endif
|
|
|
|
if (d_in_lookup(dentry)) {
|
|
ni_lock_dir(ni);
|
|
locked = true;
|
|
fnd = fnd_get();
|
|
if (!fnd) {
|
|
err = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
|
|
if (IS_ERR(d)) {
|
|
err = PTR_ERR(d);
|
|
d = NULL;
|
|
goto out2;
|
|
}
|
|
|
|
if (d)
|
|
dentry = d;
|
|
}
|
|
|
|
if (!(flags & O_CREAT) || d_really_is_positive(dentry)) {
|
|
err = finish_no_open(file, d);
|
|
goto out2;
|
|
}
|
|
|
|
file->f_mode |= FMODE_CREATED;
|
|
|
|
/*
|
|
* fnd contains tree's path to insert to.
|
|
* If fnd is not NULL then dir is locked.
|
|
*/
|
|
|
|
/*
|
|
* Unfortunately I don't know how to get here correct 'struct nameidata *nd'
|
|
* or 'struct mnt_idmap *idmap'.
|
|
* See atomic_open in fs/namei.c.
|
|
* This is why xfstest/633 failed.
|
|
* Looks like ntfs_atomic_open must accept 'struct mnt_idmap *idmap' as argument.
|
|
*/
|
|
|
|
inode = ntfs_create_inode(&nop_mnt_idmap, dir, dentry, uni, mode, 0,
|
|
NULL, 0, fnd);
|
|
err = IS_ERR(inode) ? PTR_ERR(inode) :
|
|
finish_open(file, dentry, ntfs_file_open);
|
|
dput(d);
|
|
|
|
out2:
|
|
fnd_put(fnd);
|
|
out1:
|
|
if (locked)
|
|
ni_unlock(ni);
|
|
out:
|
|
__putname(uni);
|
|
return err;
|
|
}
|
|
|
|
struct dentry *ntfs3_get_parent(struct dentry *child)
|
|
{
|
|
struct inode *inode = d_inode(child);
|
|
struct ntfs_inode *ni = ntfs_i(inode);
|
|
|
|
struct ATTR_LIST_ENTRY *le = NULL;
|
|
struct ATTRIB *attr = NULL;
|
|
struct ATTR_FILE_NAME *fname;
|
|
|
|
while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
|
|
NULL))) {
|
|
fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
|
|
if (!fname)
|
|
continue;
|
|
|
|
return d_obtain_alias(
|
|
ntfs_iget5(inode->i_sb, &fname->home, NULL));
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
/*
|
|
* dentry_operations::d_hash
|
|
*/
|
|
static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name)
|
|
{
|
|
struct ntfs_sb_info *sbi;
|
|
const char *n = name->name;
|
|
unsigned int len = name->len;
|
|
unsigned long hash;
|
|
struct cpu_str *uni;
|
|
unsigned int c;
|
|
int err;
|
|
|
|
/* First try fast implementation. */
|
|
hash = init_name_hash(dentry);
|
|
|
|
for (;;) {
|
|
if (!len--) {
|
|
name->hash = end_name_hash(hash);
|
|
return 0;
|
|
}
|
|
|
|
c = *n++;
|
|
if (c >= 0x80)
|
|
break;
|
|
|
|
hash = partial_name_hash(toupper(c), hash);
|
|
}
|
|
|
|
/*
|
|
* Try slow way with current upcase table
|
|
*/
|
|
uni = __getname();
|
|
if (!uni)
|
|
return -ENOMEM;
|
|
|
|
sbi = dentry->d_sb->s_fs_info;
|
|
|
|
err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
|
|
UTF16_HOST_ENDIAN);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
if (!err) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
|
|
init_name_hash(dentry));
|
|
name->hash = end_name_hash(hash);
|
|
err = 0;
|
|
|
|
out:
|
|
__putname(uni);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* dentry_operations::d_compare
|
|
*/
|
|
static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
|
|
const char *str, const struct qstr *name)
|
|
{
|
|
struct ntfs_sb_info *sbi;
|
|
int ret;
|
|
const char *n1 = str;
|
|
const char *n2 = name->name;
|
|
unsigned int len2 = name->len;
|
|
unsigned int lm = min(len1, len2);
|
|
unsigned char c1, c2;
|
|
struct cpu_str *uni1;
|
|
struct le_str *uni2;
|
|
|
|
/* First try fast implementation. */
|
|
for (;;) {
|
|
if (!lm--)
|
|
return len1 != len2;
|
|
|
|
if ((c1 = *n1++) == (c2 = *n2++))
|
|
continue;
|
|
|
|
if (c1 >= 0x80 || c2 >= 0x80)
|
|
break;
|
|
|
|
if (toupper(c1) != toupper(c2))
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Try slow way with current upcase table
|
|
*/
|
|
sbi = dentry->d_sb->s_fs_info;
|
|
uni1 = __getname();
|
|
if (!uni1)
|
|
return -ENOMEM;
|
|
|
|
ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
|
|
UTF16_HOST_ENDIAN);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (!ret) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
uni2 = Add2Ptr(uni1, 2048);
|
|
|
|
ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
|
|
(struct cpu_str *)uni2, NTFS_NAME_LEN,
|
|
UTF16_LITTLE_ENDIAN);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (!ret) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;
|
|
|
|
out:
|
|
__putname(uni1);
|
|
return ret;
|
|
}
|
|
|
|
// clang-format off
|
|
const struct inode_operations ntfs_dir_inode_operations = {
|
|
.lookup = ntfs_lookup,
|
|
.create = ntfs_create,
|
|
.link = ntfs_link,
|
|
.unlink = ntfs_unlink,
|
|
.symlink = ntfs_symlink,
|
|
.mkdir = ntfs_mkdir,
|
|
.rmdir = ntfs_rmdir,
|
|
.mknod = ntfs_mknod,
|
|
.rename = ntfs_rename,
|
|
.get_acl = ntfs_get_acl,
|
|
.set_acl = ntfs_set_acl,
|
|
.setattr = ntfs3_setattr,
|
|
.getattr = ntfs_getattr,
|
|
.listxattr = ntfs_listxattr,
|
|
.atomic_open = ntfs_atomic_open,
|
|
.fiemap = ntfs_fiemap,
|
|
};
|
|
|
|
const struct inode_operations ntfs_special_inode_operations = {
|
|
.setattr = ntfs3_setattr,
|
|
.getattr = ntfs_getattr,
|
|
.listxattr = ntfs_listxattr,
|
|
.get_acl = ntfs_get_acl,
|
|
.set_acl = ntfs_set_acl,
|
|
};
|
|
|
|
const struct dentry_operations ntfs_dentry_ops = {
|
|
.d_hash = ntfs_d_hash,
|
|
.d_compare = ntfs_d_compare,
|
|
};
|
|
|
|
// clang-format on
|