[linux.git] / fs / ntfs3 / namei.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);
	}

	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 user_namespace *mnt_userns = mnt_idmap_owner(idmap);
	struct inode *inode;

	inode = ntfs_create_inode(mnt_userns, 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 user_namespace *mnt_userns = mnt_idmap_owner(idmap);
	struct inode *inode;

	inode = ntfs_create_inode(mnt_userns, 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)
{
	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
	u32 size = strlen(symname);
	struct inode *inode;

	inode = ntfs_create_inode(mnt_userns, 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 user_namespace *mnt_userns = mnt_idmap_owner(idmap);
	struct inode *inode;

	inode = ntfs_create_inode(mnt_userns, 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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns'.
	 * See atomic_open in fs/namei.c.
	 * This is why xfstest/633 failed.
	 * Looks like ntfs_atomic_open must accept 'struct user_namespace *mnt_userns' as argument.
	 */

	inode = ntfs_create_inode(&init_user_ns, 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,
	.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
Commit	Line	Data
4342306f KK	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	*
	4	* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
	5	*
	6	*/
	7
4342306f	8	#include <linux/fs.h>
4342306f	9	#include <linux/nls.h>
a3a956c7	10	#include <linux/ctype.h>
2b108260	11	#include <linux/posix_acl.h>
4342306f KK	12
	13	#include "debug.h"
	14	#include "ntfs.h"
	15	#include "ntfs_fs.h"
	16
	17	/*
e8b8e97f	18	* fill_name_de - Format NTFS_DE in @buf.
4342306f KK	19	*/
	20	int fill_name_de(struct ntfs_sb_info sbi, void buf, const struct qstr *name,
	21	const struct cpu_str *uni)
	22	{
	23	int err;
	24	struct NTFS_DE *e = buf;
	25	u16 data_size;
	26	struct ATTR_FILE_NAME fname = (struct ATTR_FILE_NAME )(e + 1);
	27
	28	#ifndef CONFIG_NTFS3_64BIT_CLUSTER
	29	e->ref.high = fname->home.high = 0;
	30	#endif
	31	if (uni) {
	32	#ifdef __BIG_ENDIAN
	33	int ulen = uni->len;
	34	__le16 *uname = fname->name;
	35	const u16 *name_cpu = uni->name;
	36
	37	while (ulen--)
	38	uname++ = cpu_to_le16(name_cpu++);
	39	#else
	40	memcpy(fname->name, uni->name, uni->len * sizeof(u16));
	41	#endif
	42	fname->name_len = uni->len;
	43
	44	} else {
e8b8e97f	45	/* Convert input string to unicode. */
4342306f KK	46	err = ntfs_nls_to_utf16(sbi, name->name, name->len,
	47	(struct cpu_str *)&fname->name_len,
	48	NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
	49	if (err < 0)
	50	return err;
	51	}
	52
	53	fname->type = FILE_NAME_POSIX;
	54	data_size = fname_full_size(fname);
	55
fa3cacf5	56	e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE));
4342306f KK	57	e->key_size = cpu_to_le16(data_size);
	58	e->flags = 0;
	59	e->res = 0;
	60
	61	return 0;
	62	}
	63
	64	/*
e8b8e97f	65	* ntfs_lookup - inode_operations::lookup
4342306f KK	66	*/
	67	static struct dentry ntfs_lookup(struct inode dir, struct dentry *dentry,
	68	u32 flags)
	69	{
	70	struct ntfs_inode *ni = ntfs_i(dir);
	71	struct cpu_str *uni = __getname();
	72	struct inode *inode;
	73	int err;
	74
	75	if (!uni)
	76	inode = ERR_PTR(-ENOMEM);
	77	else {
	78	err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
	79	dentry->d_name.len, uni, NTFS_NAME_LEN,
	80	UTF16_HOST_ENDIAN);
	81	if (err < 0)
	82	inode = ERR_PTR(err);
	83	else {
	84	ni_lock(ni);
	85	inode = dir_search_u(dir, uni, NULL);
	86	ni_unlock(ni);
	87	}
	88	__putname(uni);
	89	}
	90
	91	return d_splice_alias(inode, dentry);
	92	}
	93
	94	/*
e8b8e97f	95	* ntfs_create - inode_operations::create
4342306f	96	*/
6c960e68	97	static int ntfs_create(struct mnt_idmap idmap, struct inode dir,
4342306f KK	98	struct dentry *dentry, umode_t mode, bool excl)
4342306f KK	99	{
6c960e68	100	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
4342306f KK	101	struct inode *inode;
4342306f KK	102
4342306f KK	103	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG \| mode,
	104	0, NULL, 0, NULL);
	105
4342306f KK	106	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	107	}
	108
	109	/*
	110	* ntfs_mknod
	111	*
	112	* inode_operations::mknod
	113	*/
5ebb29be	114	static int ntfs_mknod(struct mnt_idmap idmap, struct inode dir,
4342306f KK	115	struct dentry *dentry, umode_t mode, dev_t rdev)
4342306f KK	116	{
5ebb29be	117	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
4342306f KK	118	struct inode *inode;
4342306f KK	119
4342306f KK	120	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev,
	121	NULL, 0, NULL);
	122
4342306f KK	123	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	124	}
	125
	126	/*
e8b8e97f	127	* ntfs_link - inode_operations::link
4342306f KK	128	*/
	129	static int ntfs_link(struct dentry ode, struct inode dir, struct dentry *de)
	130	{
	131	int err;
	132	struct inode *inode = d_inode(ode);
	133	struct ntfs_inode *ni = ntfs_i(inode);
	134
	135	if (S_ISDIR(inode->i_mode))
	136	return -EPERM;
	137
	138	if (inode->i_nlink >= NTFS_LINK_MAX)
	139	return -EMLINK;
	140
	141	ni_lock_dir(ntfs_i(dir));
	142	if (inode != dir)
	143	ni_lock(ni);
	144
4342306f KK	145	inc_nlink(inode);
	146	ihold(inode);
	147
	148	err = ntfs_link_inode(inode, de);
78ab59fe	149
4342306f	150	if (!err) {
78ab59fe KK	151	dir->i_ctime = dir->i_mtime = inode->i_ctime =
78ab59fe KK	152	current_time(dir);
4342306f KK	153	mark_inode_dirty(inode);
	154	mark_inode_dirty(dir);
	155	d_instantiate(de, inode);
	156	} else {
	157	drop_nlink(inode);
	158	iput(inode);
	159	}
	160
	161	if (inode != dir)
	162	ni_unlock(ni);
	163	ni_unlock(ntfs_i(dir));
	164
	165	return err;
	166	}
	167
	168	/*
e8b8e97f	169	* ntfs_unlink - inode_operations::unlink
4342306f KK	170	*/
	171	static int ntfs_unlink(struct inode dir, struct dentry dentry)
	172	{
	173	struct ntfs_inode *ni = ntfs_i(dir);
	174	int err;
	175
	176	ni_lock_dir(ni);
	177
	178	err = ntfs_unlink_inode(dir, dentry);
	179
	180	ni_unlock(ni);
	181
	182	return err;
	183	}
	184
	185	/*
e8b8e97f	186	* ntfs_symlink - inode_operations::symlink
4342306f	187	*/
7a77db95	188	static int ntfs_symlink(struct mnt_idmap idmap, struct inode dir,
4342306f KK	189	struct dentry dentry, const char symname)
4342306f KK	190	{
7a77db95	191	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
4342306f KK	192	u32 size = strlen(symname);
4342306f KK	193	struct inode *inode;
4342306f KK	194
	195	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK \| 0777,
	196	0, symname, size, NULL);
	197
4342306f KK	198	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	199	}
	200
	201	/*
e8b8e97f	202	* ntfs_mkdir- inode_operations::mkdir
4342306f	203	*/
c54bd91e	204	static int ntfs_mkdir(struct mnt_idmap idmap, struct inode dir,
4342306f KK	205	struct dentry *dentry, umode_t mode)
4342306f KK	206	{
c54bd91e	207	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
4342306f	208	struct inode *inode;
4342306f KK	209
	210	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR \| mode,
	211	0, NULL, 0, NULL);
	212
4342306f KK	213	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	214	}
	215
	216	/*
6700eabb	217	* ntfs_rmdir - inode_operations::rmdir
4342306f KK	218	*/
	219	static int ntfs_rmdir(struct inode dir, struct dentry dentry)
	220	{
	221	struct ntfs_inode *ni = ntfs_i(dir);
	222	int err;
	223
	224	ni_lock_dir(ni);
	225
	226	err = ntfs_unlink_inode(dir, dentry);
	227
	228	ni_unlock(ni);
	229
	230	return err;
	231	}
	232
	233	/*
e8b8e97f	234	* ntfs_rename - inode_operations::rename
4342306f	235	*/
78ab59fe KK	236	static int ntfs_rename(struct user_namespace mnt_userns, struct inode dir,
78ab59fe KK	237	struct dentry dentry, struct inode new_dir,
4342306f KK	238	struct dentry *new_dentry, u32 flags)
	239	{
	240	int err;
78ab59fe	241	struct super_block *sb = dir->i_sb;
4342306f	242	struct ntfs_sb_info *sbi = sb->s_fs_info;
78ab59fe	243	struct ntfs_inode *dir_ni = ntfs_i(dir);
4342306f	244	struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
78ab59fe KK	245	struct inode *inode = d_inode(dentry);
	246	struct ntfs_inode *ni = ntfs_i(inode);
	247	struct inode *new_inode = d_inode(new_dentry);
	248	struct NTFS_DE de, new_de;
	249	bool is_same, is_bad;
	250	/*
	251	* de - memory of PATH_MAX bytes:
	252	* [0-1024) - original name (dentry->d_name)
	253	* [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
	254	* [2048-3072) - new name (new_dentry->d_name)
	255	*/
4342306f KK	256	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
	257	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
	258	1024);
	259	static_assert(PATH_MAX >= 4 * 1024);
	260
	261	if (flags & ~RENAME_NOREPLACE)
	262	return -EINVAL;
	263
78ab59fe KK	264	is_same = dentry->d_name.len == new_dentry->d_name.len &&
	265	!memcmp(dentry->d_name.name, new_dentry->d_name.name,
	266	dentry->d_name.len);
4342306f	267
78ab59fe	268	if (is_same && dir == new_dir) {
e8b8e97f	269	/* Nothing to do. */
78ab59fe	270	return 0;
4342306f KK	271	}
4342306f KK	272
78ab59fe KK	273	if (ntfs_is_meta_file(sbi, inode->i_ino)) {
	274	/* Should we print an error? */
	275	return -EINVAL;
4342306f KK	276	}
	277
	278	if (new_inode) {
e8b8e97f	279	/* Target name exists. Unlink it. */
4342306f KK	280	dget(new_dentry);
	281	ni_lock_dir(new_dir_ni);
	282	err = ntfs_unlink_inode(new_dir, new_dentry);
	283	ni_unlock(new_dir_ni);
	284	dput(new_dentry);
	285	if (err)
78ab59fe	286	return err;
4342306f KK	287	}
4342306f KK	288
e8b8e97f	289	/* Allocate PATH_MAX bytes. */
78ab59fe KK	290	de = __getname();
	291	if (!de)
	292	return -ENOMEM;
4342306f	293
78ab59fe KK	294	/* Translate dentry->d_name into unicode form. */
78ab59fe KK	295	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
4342306f	296	if (err < 0)
78ab59fe	297	goto out;
4342306f KK	298
4342306f KK	299	if (is_same) {
78ab59fe KK	300	/* Reuse 'de'. */
78ab59fe KK	301	new_de = de;
4342306f	302	} else {
78ab59fe KK	303	/* Translate new_dentry->d_name into unicode form. */
78ab59fe KK	304	new_de = Add2Ptr(de, 2048);
4342306f KK	305	err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
4342306f KK	306	if (err < 0)
78ab59fe	307	goto out;
4342306f KK	308	}
4342306f KK	309
78ab59fe KK	310	ni_lock_dir(dir_ni);
78ab59fe KK	311	ni_lock(ni);
0ad9dfcb KK	312	if (dir_ni != new_dir_ni)
0ad9dfcb KK	313	ni_lock_dir2(new_dir_ni);
78ab59fe KK	314
	315	is_bad = false;
	316	err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
	317	if (is_bad) {
	318	/* Restore after failed rename failed too. */
c12df45e	319	_ntfs_bad_inode(inode);
78ab59fe KK	320	} else if (!err) {
	321	inode->i_ctime = dir->i_ctime = dir->i_mtime =
	322	current_time(dir);
	323	mark_inode_dirty(inode);
	324	mark_inode_dirty(dir);
	325	if (dir != new_dir) {
	326	new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime;
	327	mark_inode_dirty(new_dir);
4342306f	328	}
4342306f	329
78ab59fe KK	330	if (IS_DIRSYNC(dir))
78ab59fe KK	331	ntfs_sync_inode(dir);
4342306f	332
78ab59fe KK	333	if (IS_DIRSYNC(new_dir))
78ab59fe KK	334	ntfs_sync_inode(inode);
4342306f KK	335	}
4342306f KK	336
0ad9dfcb KK	337	if (dir_ni != new_dir_ni)
0ad9dfcb KK	338	ni_unlock(new_dir_ni);
78ab59fe KK	339	ni_unlock(ni);
78ab59fe KK	340	ni_unlock(dir_ni);
4342306f	341	out:
78ab59fe	342	__putname(de);
4342306f KK	343	return err;
	344	}
	345
2b108260 KK	346	/*
	347	* ntfs_atomic_open
	348	*
	349	* inode_operations::atomic_open
	350	*/
	351	static int ntfs_atomic_open(struct inode dir, struct dentry dentry,
	352	struct file *file, u32 flags, umode_t mode)
	353	{
	354	int err;
	355	struct inode *inode;
	356	struct ntfs_fnd *fnd = NULL;
	357	struct ntfs_inode *ni = ntfs_i(dir);
	358	struct dentry *d = NULL;
	359	struct cpu_str *uni = __getname();
	360	bool locked = false;
	361
	362	if (!uni)
	363	return -ENOMEM;
	364
	365	err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
	366	dentry->d_name.len, uni, NTFS_NAME_LEN,
	367	UTF16_HOST_ENDIAN);
	368	if (err < 0)
	369	goto out;
	370
	371	#ifdef CONFIG_NTFS3_FS_POSIX_ACL
	372	if (IS_POSIXACL(dir)) {
	373	/*
	374	* Load in cache current acl to avoid ni_lock(dir):
	375	* ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
	376	* ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
	377	*/
6022ec6e	378	struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
2b108260 KK	379
	380	if (IS_ERR(p)) {
	381	err = PTR_ERR(p);
	382	goto out;
	383	}
	384	posix_acl_release(p);
	385	}
	386	#endif
	387
	388	if (d_in_lookup(dentry)) {
	389	ni_lock_dir(ni);
	390	locked = true;
	391	fnd = fnd_get();
	392	if (!fnd) {
	393	err = -ENOMEM;
	394	goto out1;
	395	}
	396
	397	d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
	398	if (IS_ERR(d)) {
	399	err = PTR_ERR(d);
	400	d = NULL;
	401	goto out2;
	402	}
	403
	404	if (d)
	405	dentry = d;
	406	}
	407
	408	if (!(flags & O_CREAT) \|\| d_really_is_positive(dentry)) {
	409	err = finish_no_open(file, d);
	410	goto out2;
	411	}
	412
	413	file->f_mode \|= FMODE_CREATED;
	414
	415	/*
	416	* fnd contains tree's path to insert to.
	417	* If fnd is not NULL then dir is locked.
	418	*/
	419
	420	/*
	421	* Unfortunately I don't know how to get here correct 'struct nameidata *nd'
	422	* or 'struct user_namespace *mnt_userns'.
	423	* See atomic_open in fs/namei.c.
	424	* This is why xfstest/633 failed.
	425	* Looks like ntfs_atomic_open must accept 'struct user_namespace *mnt_userns' as argument.
	426	*/
	427
	428	inode = ntfs_create_inode(&init_user_ns, dir, dentry, uni, mode, 0,
	429	NULL, 0, fnd);
	430	err = IS_ERR(inode) ? PTR_ERR(inode)
	431	: finish_open(file, dentry, ntfs_file_open);
	432	dput(d);
	433
	434	out2:
	435	fnd_put(fnd);
	436	out1:
	437	if (locked)
	438	ni_unlock(ni);
	439	out:
	440	__putname(uni);
	441	return err;
	442	}
443
4342306f KK	444	struct dentry ntfs3_get_parent(struct dentry child)
	445	{
	446	struct inode *inode = d_inode(child);
	447	struct ntfs_inode *ni = ntfs_i(inode);
	448
	449	struct ATTR_LIST_ENTRY *le = NULL;
	450	struct ATTRIB *attr = NULL;
	451	struct ATTR_FILE_NAME *fname;
	452
	453	while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
	454	NULL))) {
	455	fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
	456	if (!fname)
	457	continue;
	458
	459	return d_obtain_alias(
	460	ntfs_iget5(inode->i_sb, &fname->home, NULL));
	461	}
	462
	463	return ERR_PTR(-ENOENT);
	464	}
	465
a3a956c7 KK	466	/*
	467	* dentry_operations::d_hash
	468	*/
	469	static int ntfs_d_hash(const struct dentry dentry, struct qstr name)
	470	{
	471	struct ntfs_sb_info *sbi;
	472	const char *n = name->name;
	473	unsigned int len = name->len;
	474	unsigned long hash;
	475	struct cpu_str *uni;
	476	unsigned int c;
	477	int err;
	478
	479	/* First try fast implementation. */
	480	hash = init_name_hash(dentry);
	481
	482	for (;;) {
	483	if (!len--) {
	484	name->hash = end_name_hash(hash);
	485	return 0;
	486	}
	487
	488	c = *n++;
	489	if (c >= 0x80)
	490	break;
	491
	492	hash = partial_name_hash(toupper(c), hash);
	493	}
	494
	495	/*
	496	* Try slow way with current upcase table
	497	*/
	498	uni = __getname();
	499	if (!uni)
	500	return -ENOMEM;
	501
	502	sbi = dentry->d_sb->s_fs_info;
	503
	504	err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
	505	UTF16_HOST_ENDIAN);
	506	if (err < 0)
	507	goto out;
	508
	509	if (!err) {
	510	err = -EINVAL;
	511	goto out;
	512	}
	513
	514	hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
	515	init_name_hash(dentry));
	516	name->hash = end_name_hash(hash);
	517	err = 0;
	518
	519	out:
	520	__putname(uni);
	521	return err;
	522	}
	523
	524	/*
	525	* dentry_operations::d_compare
	526	*/
	527	static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
	528	const char str, const struct qstr name)
	529	{
530	struct ntfs_sb_info *sbi;
531	int ret;
532	const char *n1 = str;
533	const char *n2 = name->name;
534	unsigned int len2 = name->len;
535	unsigned int lm = min(len1, len2);
536	unsigned char c1, c2;
9144b438 KK	537	struct cpu_str *uni1;
9144b438 KK	538	struct le_str *uni2;
a3a956c7 KK	539
	540	/* First try fast implementation. */
	541	for (;;) {
0d6d7c61	542	if (!lm--)
75b5e472	543	return len1 != len2;
a3a956c7 KK	544
	545	if ((c1 = n1++) == (c2 = n2++))
	546	continue;
	547
	548	if (c1 >= 0x80 \|\| c2 >= 0x80)
	549	break;
	550
0d6d7c61 NC	551	if (toupper(c1) != toupper(c2))
0d6d7c61 NC	552	return 1;
a3a956c7 KK	553	}
	554
	555	/*
	556	* Try slow way with current upcase table
	557	*/
	558	sbi = dentry->d_sb->s_fs_info;
	559	uni1 = __getname();
	560	if (!uni1)
	561	return -ENOMEM;
	562
	563	ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
	564	UTF16_HOST_ENDIAN);
	565	if (ret < 0)
	566	goto out;
	567
	568	if (!ret) {
	569	ret = -EINVAL;
	570	goto out;
	571	}
	572
	573	uni2 = Add2Ptr(uni1, 2048);
	574
9144b438 KK	575	ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
	576	(struct cpu_str *)uni2, NTFS_NAME_LEN,
	577	UTF16_LITTLE_ENDIAN);
a3a956c7 KK	578	if (ret < 0)
	579	goto out;
	580
	581	if (!ret) {
	582	ret = -EINVAL;
	583	goto out;
	584	}
	585
9144b438	586	ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;
a3a956c7 KK	587
	588	out:
	589	__putname(uni1);
	590	return ret;
	591	}
	592
4342306f KK	593	// clang-format off
	594	const struct inode_operations ntfs_dir_inode_operations = {
	595	.lookup = ntfs_lookup,
	596	.create = ntfs_create,
	597	.link = ntfs_link,
	598	.unlink = ntfs_unlink,
	599	.symlink = ntfs_symlink,
	600	.mkdir = ntfs_mkdir,
	601	.rmdir = ntfs_rmdir,
	602	.mknod = ntfs_mknod,
	603	.rename = ntfs_rename,
	604	.permission = ntfs_permission,
cac2f8b8	605	.get_inode_acl = ntfs_get_acl,
4342306f KK	606	.set_acl = ntfs_set_acl,
	607	.setattr = ntfs3_setattr,
	608	.getattr = ntfs_getattr,
	609	.listxattr = ntfs_listxattr,
2b108260	610	.atomic_open = ntfs_atomic_open,
4342306f KK	611	.fiemap = ntfs_fiemap,
	612	};
	613
	614	const struct inode_operations ntfs_special_inode_operations = {
	615	.setattr = ntfs3_setattr,
	616	.getattr = ntfs_getattr,
	617	.listxattr = ntfs_listxattr,
cac2f8b8	618	.get_inode_acl = ntfs_get_acl,
4342306f KK	619	.set_acl = ntfs_set_acl,
4342306f KK	620	};
a3a956c7 KK	621
	622	const struct dentry_operations ntfs_dentry_ops = {
	623	.d_hash = ntfs_d_hash,
	624	.d_compare = ntfs_d_compare,
	625	};
	626
4342306f	627	// clang-format on