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