[linux-block.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);
	}

	/*
	 * Check for a null pointer
	 * If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL.
	 * This causes null pointer dereference in d_splice_alias().
	 */
	if (!IS_ERR_OR_NULL(inode) && !inode->i_op) {
		iput(inode);
		inode = ERR_PTR(-EINVAL);
	}

	return d_splice_alias(inode, dentry);
}

/*
 * ntfs_create - inode_operations::create
 */
static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir,
		       struct dentry *dentry, umode_t mode, bool excl)
{
	struct inode *inode;

	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode, 0,
				  NULL, 0, NULL);

	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
}

/*
 * ntfs_mknod
 *
 * inode_operations::mknod
 */
static int ntfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
		      struct dentry *dentry, umode_t mode, dev_t rdev)
{
	struct inode *inode;

	inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0,
				  NULL);

	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
}

/*
 * ntfs_link - inode_operations::link
 */
static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
{
	int err;
	struct inode *inode = d_inode(ode);
	struct ntfs_inode *ni = ntfs_i(inode);

	if (S_ISDIR(inode->i_mode))
		return -EPERM;

	if (inode->i_nlink >= NTFS_LINK_MAX)
		return -EMLINK;

	ni_lock_dir(ntfs_i(dir));
	if (inode != dir)
		ni_lock(ni);

	inc_nlink(inode);
	ihold(inode);

	err = ntfs_link_inode(inode, de);

	if (!err) {
		inode_set_ctime_current(inode);
		inode_set_mtime_to_ts(dir, inode_set_ctime_current(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;

	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
		return -EIO;

	ni_lock_dir(ni);

	err = ntfs_unlink_inode(dir, dentry);

	ni_unlock(ni);

	return err;
}

/*
 * ntfs_symlink - inode_operations::symlink
 */
static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
			struct dentry *dentry, const char *symname)
{
	u32 size = strlen(symname);
	struct inode *inode;

	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
		return -EIO;

	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777, 0,
				  symname, size, NULL);

	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
}

/*
 * ntfs_mkdir- inode_operations::mkdir
 */
static int ntfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
		      struct dentry *dentry, umode_t mode)
{
	struct inode *inode;

	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode, 0,
				  NULL, 0, NULL);

	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
}

/*
 * ntfs_rmdir - inode_operations::rmdir
 */
static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct ntfs_inode *ni = ntfs_i(dir);
	int err;

	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
		return -EIO;

	ni_lock_dir(ni);

	err = ntfs_unlink_inode(dir, dentry);

	ni_unlock(ni);

	return err;
}

/*
 * ntfs_rename - inode_operations::rename
 */
static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir,
		       struct dentry *dentry, struct inode *new_dir,
		       struct dentry *new_dentry, u32 flags)
{
	int err;
	struct super_block *sb = dir->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct ntfs_inode *dir_ni = ntfs_i(dir);
	struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
	struct inode *inode = d_inode(dentry);
	struct ntfs_inode *ni = ntfs_i(inode);
	struct inode *new_inode = d_inode(new_dentry);
	struct NTFS_DE *de, *new_de;
	bool is_same, is_bad;
	/*
	 * de		- memory of PATH_MAX bytes:
	 * [0-1024)	- original name (dentry->d_name)
	 * [1024-2048)	- paired to original name, usually DOS variant of dentry->d_name
	 * [2048-3072)	- new name (new_dentry->d_name)
	 */
	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
		      1024);
	static_assert(PATH_MAX >= 4 * 1024);

	if (unlikely(ntfs3_forced_shutdown(sb)))
		return -EIO;

	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) {
		simple_rename_timestamp(dir, dentry, new_dir, new_dentry);
		mark_inode_dirty(inode);
		mark_inode_dirty(dir);
		if (dir != new_dir)
			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.
	 */
	inode = ntfs_create_inode(file_mnt_idmap(file), dir, dentry, uni,
				  mode, 0, NULL, 0, fnd);
	err = IS_ERR(inode) ? PTR_ERR(inode) :
			      finish_open(file, dentry, ntfs_file_open);
	dput(d);

out2:
	fnd_put(fnd);
out1:
	if (locked)
		ni_unlock(ni);
out:
	__putname(uni);
	return err;
}

struct dentry *ntfs3_get_parent(struct dentry *child)
{
	struct inode *inode = d_inode(child);
	struct ntfs_inode *ni = ntfs_i(inode);

	struct ATTR_LIST_ENTRY *le = NULL;
	struct ATTRIB *attr = NULL;
	struct ATTR_FILE_NAME *fname;

	while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
				    NULL))) {
		fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
		if (!fname)
			continue;

		return d_obtain_alias(
			ntfs_iget5(inode->i_sb, &fname->home, NULL));
	}

	return ERR_PTR(-ENOENT);
}

/*
 * dentry_operations::d_hash
 */
static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name)
{
	struct ntfs_sb_info *sbi;
	const char *n = name->name;
	unsigned int len = name->len;
	unsigned long hash;
	struct cpu_str *uni;
	unsigned int c;
	int err;

	/* First try fast implementation. */
	hash = init_name_hash(dentry);

	for (;;) {
		if (!len--) {
			name->hash = end_name_hash(hash);
			return 0;
		}

		c = *n++;
		if (c >= 0x80)
			break;

		hash = partial_name_hash(toupper(c), hash);
	}

	/*
	 * Try slow way with current upcase table
	 */
	uni = __getname();
	if (!uni)
		return -ENOMEM;

	sbi = dentry->d_sb->s_fs_info;

	err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
				UTF16_HOST_ENDIAN);
	if (err < 0)
		goto out;

	if (!err) {
		err = -EINVAL;
		goto out;
	}

	hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
			       init_name_hash(dentry));
	name->hash = end_name_hash(hash);
	err = 0;

out:
	__putname(uni);
	return err;
}

/*
 * dentry_operations::d_compare
 */
static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
			  const char *str, const struct qstr *name)
{
	struct ntfs_sb_info *sbi;
	int ret;
	const char *n1 = str;
	const char *n2 = name->name;
	unsigned int len2 = name->len;
	unsigned int lm = min(len1, len2);
	unsigned char c1, c2;
	struct cpu_str *uni1;
	struct le_str *uni2;

	/* First try fast implementation. */
	for (;;) {
		if (!lm--)
			return len1 != len2;

		if ((c1 = *n1++) == (c2 = *n2++))
			continue;

		if (c1 >= 0x80 || c2 >= 0x80)
			break;

		if (toupper(c1) != toupper(c2))
			return 1;
	}

	/*
	 * Try slow way with current upcase table
	 */
	sbi = dentry->d_sb->s_fs_info;
	uni1 = __getname();
	if (!uni1)
		return -ENOMEM;

	ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
				UTF16_HOST_ENDIAN);
	if (ret < 0)
		goto out;

	if (!ret) {
		ret = -EINVAL;
		goto out;
	}

	uni2 = Add2Ptr(uni1, 2048);

	ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
				(struct cpu_str *)uni2, NTFS_NAME_LEN,
				UTF16_LITTLE_ENDIAN);
	if (ret < 0)
		goto out;

	if (!ret) {
		ret = -EINVAL;
		goto out;
	}

	ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;

out:
	__putname(uni1);
	return ret;
}

// clang-format off
const struct inode_operations ntfs_dir_inode_operations = {
	.lookup		= ntfs_lookup,
	.create		= ntfs_create,
	.link		= ntfs_link,
	.unlink		= ntfs_unlink,
	.symlink	= ntfs_symlink,
	.mkdir		= ntfs_mkdir,
	.rmdir		= ntfs_rmdir,
	.mknod		= ntfs_mknod,
	.rename		= ntfs_rename,
	.get_acl	= ntfs_get_acl,
	.set_acl	= ntfs_set_acl,
	.setattr	= ntfs3_setattr,
	.getattr	= ntfs_getattr,
	.listxattr	= ntfs_listxattr,
	.atomic_open	= ntfs_atomic_open,
	.fiemap		= ntfs_fiemap,
};

const struct inode_operations ntfs_special_inode_operations = {
	.setattr	= ntfs3_setattr,
	.getattr	= ntfs_getattr,
	.listxattr	= ntfs_listxattr,
	.get_acl	= ntfs_get_acl,
	.set_acl	= ntfs_set_acl,
};

const struct dentry_operations ntfs_dentry_ops = {
	.d_hash		= ntfs_d_hash,
	.d_compare	= ntfs_d_compare,
};

// clang-format on
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
254e69f2 Z	91	/*
	92	* Check for a null pointer
	93	* If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL.
	94	* This causes null pointer dereference in d_splice_alias().
	95	*/
6827d50b	96	if (!IS_ERR_OR_NULL(inode) && !inode->i_op) {
254e69f2 Z	97	iput(inode);
	98	inode = ERR_PTR(-EINVAL);
	99	}
	100
4342306f KK	101	return d_splice_alias(inode, dentry);
	102	}
	103
	104	/*
e8b8e97f	105	* ntfs_create - inode_operations::create
4342306f	106	*/
6c960e68	107	static int ntfs_create(struct mnt_idmap idmap, struct inode dir,
4342306f KK	108	struct dentry *dentry, umode_t mode, bool excl)
4342306f KK	109	{
4342306f KK	110	struct inode *inode;
4342306f KK	111
f0377761 KK	112	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG \| mode, 0,
f0377761 KK	113	NULL, 0, NULL);
4342306f	114
4342306f KK	115	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	116	}
	117
	118	/*
	119	* ntfs_mknod
	120	*
	121	* inode_operations::mknod
	122	*/
5ebb29be	123	static int ntfs_mknod(struct mnt_idmap idmap, struct inode dir,
4342306f KK	124	struct dentry *dentry, umode_t mode, dev_t rdev)
4342306f KK	125	{
4342306f KK	126	struct inode *inode;
4342306f KK	127
f0377761 KK	128	inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0,
f0377761 KK	129	NULL);
4342306f	130
4342306f KK	131	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	132	}
	133
	134	/*
e8b8e97f	135	* ntfs_link - inode_operations::link
4342306f KK	136	*/
	137	static int ntfs_link(struct dentry ode, struct inode dir, struct dentry *de)
	138	{
	139	int err;
	140	struct inode *inode = d_inode(ode);
	141	struct ntfs_inode *ni = ntfs_i(inode);
	142
	143	if (S_ISDIR(inode->i_mode))
	144	return -EPERM;
	145
	146	if (inode->i_nlink >= NTFS_LINK_MAX)
	147	return -EMLINK;
	148
	149	ni_lock_dir(ntfs_i(dir));
	150	if (inode != dir)
	151	ni_lock(ni);
	152
4342306f KK	153	inc_nlink(inode);
	154	ihold(inode);
	155
	156	err = ntfs_link_inode(inode, de);
78ab59fe	157
4342306f	158	if (!err) {
2be861fa JL	159	inode_set_ctime_current(inode);
2be861fa JL	160	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
4342306f KK	161	mark_inode_dirty(inode);
	162	mark_inode_dirty(dir);
	163	d_instantiate(de, inode);
	164	} else {
	165	drop_nlink(inode);
	166	iput(inode);
	167	}
	168
	169	if (inode != dir)
	170	ni_unlock(ni);
	171	ni_unlock(ntfs_i(dir));
	172
	173	return err;
	174	}
	175
	176	/*
e8b8e97f	177	* ntfs_unlink - inode_operations::unlink
4342306f KK	178	*/
	179	static int ntfs_unlink(struct inode dir, struct dentry dentry)
	180	{
	181	struct ntfs_inode *ni = ntfs_i(dir);
	182	int err;
	183
6c3684e7 KK	184	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
	185	return -EIO;
	186
4342306f KK	187	ni_lock_dir(ni);
	188
	189	err = ntfs_unlink_inode(dir, dentry);
	190
	191	ni_unlock(ni);
	192
	193	return err;
	194	}
	195
	196	/*
e8b8e97f	197	* ntfs_symlink - inode_operations::symlink
4342306f	198	*/
7a77db95	199	static int ntfs_symlink(struct mnt_idmap idmap, struct inode dir,
4342306f KK	200	struct dentry dentry, const char symname)
	201	{
	202	u32 size = strlen(symname);
	203	struct inode *inode;
4342306f	204
6c3684e7 KK	205	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
	206	return -EIO;
	207
f0377761 KK	208	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK \| 0777, 0,
f0377761 KK	209	symname, size, NULL);
4342306f	210
4342306f KK	211	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	212	}
	213
	214	/*
e8b8e97f	215	* ntfs_mkdir- inode_operations::mkdir
4342306f	216	*/
c54bd91e	217	static int ntfs_mkdir(struct mnt_idmap idmap, struct inode dir,
4342306f KK	218	struct dentry *dentry, umode_t mode)
	219	{
	220	struct inode *inode;
4342306f	221
f0377761 KK	222	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR \| mode, 0,
f0377761 KK	223	NULL, 0, NULL);
4342306f	224
4342306f KK	225	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	226	}
	227
	228	/*
6700eabb	229	* ntfs_rmdir - inode_operations::rmdir
4342306f KK	230	*/
	231	static int ntfs_rmdir(struct inode dir, struct dentry dentry)
	232	{
	233	struct ntfs_inode *ni = ntfs_i(dir);
	234	int err;
	235
6c3684e7 KK	236	if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
	237	return -EIO;
	238
4342306f KK	239	ni_lock_dir(ni);
	240
	241	err = ntfs_unlink_inode(dir, dentry);
	242
	243	ni_unlock(ni);
	244
	245	return err;
	246	}
	247
	248	/*
e8b8e97f	249	* ntfs_rename - inode_operations::rename
4342306f	250	*/
e18275ae	251	static int ntfs_rename(struct mnt_idmap idmap, struct inode dir,
78ab59fe	252	struct dentry dentry, struct inode new_dir,
4342306f KK	253	struct dentry *new_dentry, u32 flags)
	254	{
	255	int err;
78ab59fe	256	struct super_block *sb = dir->i_sb;
4342306f	257	struct ntfs_sb_info *sbi = sb->s_fs_info;
78ab59fe	258	struct ntfs_inode *dir_ni = ntfs_i(dir);
4342306f	259	struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
78ab59fe KK	260	struct inode *inode = d_inode(dentry);
	261	struct ntfs_inode *ni = ntfs_i(inode);
	262	struct inode *new_inode = d_inode(new_dentry);
	263	struct NTFS_DE de, new_de;
	264	bool is_same, is_bad;
	265	/*
	266	* de - memory of PATH_MAX bytes:
	267	* [0-1024) - original name (dentry->d_name)
	268	* [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
	269	* [2048-3072) - new name (new_dentry->d_name)
	270	*/
4342306f KK	271	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
	272	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
	273	1024);
	274	static_assert(PATH_MAX >= 4 * 1024);
	275
6c3684e7 KK	276	if (unlikely(ntfs3_forced_shutdown(sb)))
	277	return -EIO;
	278
4342306f KK	279	if (flags & ~RENAME_NOREPLACE)
	280	return -EINVAL;
	281
78ab59fe KK	282	is_same = dentry->d_name.len == new_dentry->d_name.len &&
	283	!memcmp(dentry->d_name.name, new_dentry->d_name.name,
	284	dentry->d_name.len);
4342306f	285
78ab59fe	286	if (is_same && dir == new_dir) {
e8b8e97f	287	/* Nothing to do. */
78ab59fe	288	return 0;
4342306f KK	289	}
4342306f KK	290
78ab59fe KK	291	if (ntfs_is_meta_file(sbi, inode->i_ino)) {
	292	/* Should we print an error? */
	293	return -EINVAL;
4342306f KK	294	}
	295
	296	if (new_inode) {
e8b8e97f	297	/* Target name exists. Unlink it. */
4342306f KK	298	dget(new_dentry);
	299	ni_lock_dir(new_dir_ni);
	300	err = ntfs_unlink_inode(new_dir, new_dentry);
	301	ni_unlock(new_dir_ni);
	302	dput(new_dentry);
	303	if (err)
78ab59fe	304	return err;
4342306f KK	305	}
4342306f KK	306
e8b8e97f	307	/* Allocate PATH_MAX bytes. */
78ab59fe KK	308	de = __getname();
	309	if (!de)
	310	return -ENOMEM;
4342306f	311
78ab59fe KK	312	/* Translate dentry->d_name into unicode form. */
78ab59fe KK	313	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
4342306f	314	if (err < 0)
78ab59fe	315	goto out;
4342306f KK	316
4342306f KK	317	if (is_same) {
78ab59fe KK	318	/* Reuse 'de'. */
78ab59fe KK	319	new_de = de;
4342306f	320	} else {
78ab59fe KK	321	/* Translate new_dentry->d_name into unicode form. */
78ab59fe KK	322	new_de = Add2Ptr(de, 2048);
4342306f KK	323	err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
4342306f KK	324	if (err < 0)
78ab59fe	325	goto out;
4342306f KK	326	}
4342306f KK	327
78ab59fe KK	328	ni_lock_dir(dir_ni);
78ab59fe KK	329	ni_lock(ni);
0ad9dfcb KK	330	if (dir_ni != new_dir_ni)
0ad9dfcb KK	331	ni_lock_dir2(new_dir_ni);
78ab59fe KK	332
	333	is_bad = false;
	334	err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
	335	if (is_bad) {
	336	/* Restore after failed rename failed too. */
c12df45e	337	_ntfs_bad_inode(inode);
78ab59fe	338	} else if (!err) {
487e34fc	339	simple_rename_timestamp(dir, dentry, new_dir, new_dentry);
78ab59fe KK	340	mark_inode_dirty(inode);
78ab59fe KK	341	mark_inode_dirty(dir);
487e34fc	342	if (dir != new_dir)
78ab59fe	343	mark_inode_dirty(new_dir);
4342306f	344
78ab59fe KK	345	if (IS_DIRSYNC(dir))
78ab59fe KK	346	ntfs_sync_inode(dir);
4342306f	347
78ab59fe KK	348	if (IS_DIRSYNC(new_dir))
78ab59fe KK	349	ntfs_sync_inode(inode);
4342306f KK	350	}
4342306f KK	351
0ad9dfcb KK	352	if (dir_ni != new_dir_ni)
0ad9dfcb KK	353	ni_unlock(new_dir_ni);
78ab59fe KK	354	ni_unlock(ni);
78ab59fe KK	355	ni_unlock(dir_ni);
4342306f	356	out:
78ab59fe	357	__putname(de);
4342306f KK	358	return err;
	359	}
	360
2b108260 KK	361	/*
	362	* ntfs_atomic_open
	363	*
	364	* inode_operations::atomic_open
	365	*/
	366	static int ntfs_atomic_open(struct inode dir, struct dentry dentry,
	367	struct file *file, u32 flags, umode_t mode)
	368	{
	369	int err;
	370	struct inode *inode;
	371	struct ntfs_fnd *fnd = NULL;
	372	struct ntfs_inode *ni = ntfs_i(dir);
	373	struct dentry *d = NULL;
	374	struct cpu_str *uni = __getname();
	375	bool locked = false;
	376
	377	if (!uni)
	378	return -ENOMEM;
	379
	380	err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
	381	dentry->d_name.len, uni, NTFS_NAME_LEN,
	382	UTF16_HOST_ENDIAN);
	383	if (err < 0)
	384	goto out;
	385
	386	#ifdef CONFIG_NTFS3_FS_POSIX_ACL
	387	if (IS_POSIXACL(dir)) {
f684073c	388	/*
2b108260 KK	389	* Load in cache current acl to avoid ni_lock(dir):
	390	* ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
	391	* ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
	392	*/
6022ec6e	393	struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
2b108260 KK	394
	395	if (IS_ERR(p)) {
	396	err = PTR_ERR(p);
	397	goto out;
	398	}
	399	posix_acl_release(p);
	400	}
	401	#endif
	402
	403	if (d_in_lookup(dentry)) {
	404	ni_lock_dir(ni);
	405	locked = true;
	406	fnd = fnd_get();
	407	if (!fnd) {
	408	err = -ENOMEM;
	409	goto out1;
	410	}
	411
	412	d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
	413	if (IS_ERR(d)) {
	414	err = PTR_ERR(d);
	415	d = NULL;
	416	goto out2;
	417	}
	418
	419	if (d)
	420	dentry = d;
	421	}
	422
	423	if (!(flags & O_CREAT) \|\| d_really_is_positive(dentry)) {
	424	err = finish_no_open(file, d);
	425	goto out2;
	426	}
	427
	428	file->f_mode \|= FMODE_CREATED;
	429
	430	/*
	431	* fnd contains tree's path to insert to.
	432	* If fnd is not NULL then dir is locked.
	433	*/
cc47a057	434	inode = ntfs_create_inode(file_mnt_idmap(file), dir, dentry, uni,
d6cd7cec	435	mode, 0, NULL, 0, fnd);
96de65a9	436	err = IS_ERR(inode) ? PTR_ERR(inode) :
d6cd7cec	437	finish_open(file, dentry, ntfs_file_open);
2b108260 KK	438	dput(d);
	439
	440	out2:
	441	fnd_put(fnd);
	442	out1:
	443	if (locked)
	444	ni_unlock(ni);
	445	out:
	446	__putname(uni);
	447	return err;
	448	}
	449
4342306f KK	450	struct dentry ntfs3_get_parent(struct dentry child)
	451	{
	452	struct inode *inode = d_inode(child);
	453	struct ntfs_inode *ni = ntfs_i(inode);
	454
	455	struct ATTR_LIST_ENTRY *le = NULL;
	456	struct ATTRIB *attr = NULL;
	457	struct ATTR_FILE_NAME *fname;
	458
	459	while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
	460	NULL))) {
	461	fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
	462	if (!fname)
	463	continue;
	464
	465	return d_obtain_alias(
	466	ntfs_iget5(inode->i_sb, &fname->home, NULL));
	467	}
	468
	469	return ERR_PTR(-ENOENT);
	470	}
	471
a3a956c7 KK	472	/*
	473	* dentry_operations::d_hash
	474	*/
	475	static int ntfs_d_hash(const struct dentry dentry, struct qstr name)
	476	{
	477	struct ntfs_sb_info *sbi;
	478	const char *n = name->name;
	479	unsigned int len = name->len;
	480	unsigned long hash;
	481	struct cpu_str *uni;
	482	unsigned int c;
	483	int err;
	484
	485	/* First try fast implementation. */
	486	hash = init_name_hash(dentry);
	487
	488	for (;;) {
	489	if (!len--) {
	490	name->hash = end_name_hash(hash);
	491	return 0;
	492	}
	493
	494	c = *n++;
	495	if (c >= 0x80)
	496	break;
	497
	498	hash = partial_name_hash(toupper(c), hash);
	499	}
	500
	501	/*
	502	* Try slow way with current upcase table
	503	*/
	504	uni = __getname();
	505	if (!uni)
	506	return -ENOMEM;
	507
	508	sbi = dentry->d_sb->s_fs_info;
	509
	510	err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
	511	UTF16_HOST_ENDIAN);
	512	if (err < 0)
	513	goto out;
	514
	515	if (!err) {
	516	err = -EINVAL;
	517	goto out;
	518	}
	519
	520	hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
	521	init_name_hash(dentry));
	522	name->hash = end_name_hash(hash);
	523	err = 0;
	524
	525	out:
	526	__putname(uni);
	527	return err;
	528	}
	529
	530	/*
	531	* dentry_operations::d_compare
	532	*/
	533	static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
	534	const char str, const struct qstr name)
	535	{
536	struct ntfs_sb_info *sbi;
537	int ret;
538	const char *n1 = str;
539	const char *n2 = name->name;
540	unsigned int len2 = name->len;
541	unsigned int lm = min(len1, len2);
542	unsigned char c1, c2;
9144b438 KK	543	struct cpu_str *uni1;
9144b438 KK	544	struct le_str *uni2;
a3a956c7 KK	545
	546	/* First try fast implementation. */
	547	for (;;) {
0d6d7c61	548	if (!lm--)
75b5e472	549	return len1 != len2;
a3a956c7 KK	550
	551	if ((c1 = n1++) == (c2 = n2++))
	552	continue;
	553
	554	if (c1 >= 0x80 \|\| c2 >= 0x80)
	555	break;
	556
0d6d7c61 NC	557	if (toupper(c1) != toupper(c2))
0d6d7c61 NC	558	return 1;
a3a956c7 KK	559	}
	560
	561	/*
	562	* Try slow way with current upcase table
	563	*/
	564	sbi = dentry->d_sb->s_fs_info;
	565	uni1 = __getname();
	566	if (!uni1)
	567	return -ENOMEM;
	568
	569	ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
	570	UTF16_HOST_ENDIAN);
	571	if (ret < 0)
	572	goto out;
	573
	574	if (!ret) {
	575	ret = -EINVAL;
	576	goto out;
	577	}
	578
	579	uni2 = Add2Ptr(uni1, 2048);
	580
9144b438 KK	581	ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
	582	(struct cpu_str *)uni2, NTFS_NAME_LEN,
	583	UTF16_LITTLE_ENDIAN);
a3a956c7 KK	584	if (ret < 0)
	585	goto out;
	586
	587	if (!ret) {
	588	ret = -EINVAL;
	589	goto out;
	590	}
	591
9144b438	592	ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;
a3a956c7 KK	593
	594	out:
	595	__putname(uni1);
	596	return ret;
	597	}
	598
4342306f KK	599	// clang-format off
	600	const struct inode_operations ntfs_dir_inode_operations = {
	601	.lookup = ntfs_lookup,
	602	.create = ntfs_create,
	603	.link = ntfs_link,
	604	.unlink = ntfs_unlink,
	605	.symlink = ntfs_symlink,
	606	.mkdir = ntfs_mkdir,
	607	.rmdir = ntfs_rmdir,
	608	.mknod = ntfs_mknod,
	609	.rename = ntfs_rename,
75c5e0c9	610	.get_acl = ntfs_get_acl,
4342306f KK	611	.set_acl = ntfs_set_acl,
	612	.setattr = ntfs3_setattr,
	613	.getattr = ntfs_getattr,
	614	.listxattr = ntfs_listxattr,
2b108260	615	.atomic_open = ntfs_atomic_open,
4342306f KK	616	.fiemap = ntfs_fiemap,
	617	};
	618
	619	const struct inode_operations ntfs_special_inode_operations = {
	620	.setattr = ntfs3_setattr,
	621	.getattr = ntfs_getattr,
	622	.listxattr = ntfs_listxattr,
75c5e0c9	623	.get_acl = ntfs_get_acl,
4342306f KK	624	.set_acl = ntfs_set_acl,
4342306f KK	625	};
a3a956c7 KK	626
	627	const struct dentry_operations ntfs_dentry_ops = {
	628	.d_hash = ntfs_d_hash,
	629	.d_compare = ntfs_d_compare,
	630	};
	631
4342306f	632	// clang-format on