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385 lines
8.3 KiB
385 lines
8.3 KiB
// 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 "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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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 user_namespace *mnt_userns, 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(mnt_userns, 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 user_namespace *mnt_userns, 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(mnt_userns, 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 user_namespace *mnt_userns, 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(mnt_userns, 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 user_namespace *mnt_userns, 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(mnt_userns, 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 user_namespace *mnt_userns, 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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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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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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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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// clang-format off |
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const struct inode_operations ntfs_dir_inode_operations = { |
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.lookup = ntfs_lookup, |
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.create = ntfs_create, |
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.link = ntfs_link, |
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.unlink = ntfs_unlink, |
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.symlink = ntfs_symlink, |
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.mkdir = ntfs_mkdir, |
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.rmdir = ntfs_rmdir, |
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.mknod = ntfs_mknod, |
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.rename = ntfs_rename, |
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.permission = ntfs_permission, |
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.get_acl = ntfs_get_acl, |
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.set_acl = ntfs_set_acl, |
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.setattr = ntfs3_setattr, |
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.getattr = ntfs_getattr, |
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.listxattr = ntfs_listxattr, |
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.fiemap = ntfs_fiemap, |
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}; |
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const struct inode_operations ntfs_special_inode_operations = { |
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.setattr = ntfs3_setattr, |
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.getattr = ntfs_getattr, |
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.listxattr = ntfs_listxattr, |
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.get_acl = ntfs_get_acl, |
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.set_acl = ntfs_set_acl, |
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}; |
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// clang-format on
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