[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);
	}

	return d_splice_alias(inode, dentry);
}

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

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

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

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

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

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

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

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

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

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

	inc_nlink(inode);
	ihold(inode);

	err = ntfs_link_inode(inode, de);

	if (!err) {
		dir->i_ctime = dir->i_mtime = inode->i_ctime =
			current_time(dir);
		mark_inode_dirty(inode);
		mark_inode_dirty(dir);
		d_instantiate(de, inode);
	} else {
		drop_nlink(inode);
		iput(inode);
	}

	if (inode != dir)
		ni_unlock(ni);
	ni_unlock(ntfs_i(dir));

	return err;
}

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

	ni_lock_dir(ni);

	err = ntfs_unlink_inode(dir, dentry);

	ni_unlock(ni);

	return err;
}

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

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

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

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

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

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

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

	ni_lock_dir(ni);

	err = ntfs_unlink_inode(dir, dentry);

	ni_unlock(ni);

	return err;
}

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

	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

	is_same = dentry->d_name.len == new_dentry->d_name.len &&
		  !memcmp(dentry->d_name.name, new_dentry->d_name.name,
			  dentry->d_name.len);

	if (is_same && dir == new_dir) {
		/* Nothing to do. */
		return 0;
	}

	if (ntfs_is_meta_file(sbi, inode->i_ino)) {
		/* Should we print an error? */
		return -EINVAL;
	}

	if (new_inode) {
		/* Target name exists. Unlink it. */
		dget(new_dentry);
		ni_lock_dir(new_dir_ni);
		err = ntfs_unlink_inode(new_dir, new_dentry);
		ni_unlock(new_dir_ni);
		dput(new_dentry);
		if (err)
			return err;
	}

	/* Allocate PATH_MAX bytes. */
	de = __getname();
	if (!de)
		return -ENOMEM;

	/* Translate dentry->d_name into unicode form. */
	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
	if (err < 0)
		goto out;

	if (is_same) {
		/* Reuse 'de'. */
		new_de = de;
	} else {
		/* Translate new_dentry->d_name into unicode form. */
		new_de = Add2Ptr(de, 2048);
		err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
		if (err < 0)
			goto out;
	}

	ni_lock_dir(dir_ni);
	ni_lock(ni);
	if (dir_ni != new_dir_ni)
		ni_lock_dir2(new_dir_ni);

	is_bad = false;
	err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
	if (is_bad) {
		/* Restore after failed rename failed too. */
		_ntfs_bad_inode(inode);
	} else if (!err) {
		inode->i_ctime = dir->i_ctime = dir->i_mtime =
			current_time(dir);
		mark_inode_dirty(inode);
		mark_inode_dirty(dir);
		if (dir != new_dir) {
			new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime;
			mark_inode_dirty(new_dir);
		}

		if (IS_DIRSYNC(dir))
			ntfs_sync_inode(dir);

		if (IS_DIRSYNC(new_dir))
			ntfs_sync_inode(inode);
	}

	if (dir_ni != new_dir_ni)
		ni_unlock(new_dir_ni);
	ni_unlock(ni);
	ni_unlock(dir_ni);
out:
	__putname(de);
	return err;
}

/*
 * ntfs_atomic_open
 *
 * inode_operations::atomic_open
 */
static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry,
			    struct file *file, u32 flags, umode_t mode)
{
	int err;
	struct inode *inode;
	struct ntfs_fnd *fnd = NULL;
	struct ntfs_inode *ni = ntfs_i(dir);
	struct dentry *d = NULL;
	struct cpu_str *uni = __getname();
	bool locked = false;

	if (!uni)
		return -ENOMEM;

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

#ifdef CONFIG_NTFS3_FS_POSIX_ACL
	if (IS_POSIXACL(dir)) {
		/* 
		 * Load in cache current acl to avoid ni_lock(dir):
		 * ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
		 * ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
		 */
		struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);

		if (IS_ERR(p)) {
			err = PTR_ERR(p);
			goto out;
		}
		posix_acl_release(p);
	}
#endif

	if (d_in_lookup(dentry)) {
		ni_lock_dir(ni);
		locked = true;
		fnd = fnd_get();
		if (!fnd) {
			err = -ENOMEM;
			goto out1;
		}

		d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
		if (IS_ERR(d)) {
			err = PTR_ERR(d);
			d = NULL;
			goto out2;
		}

		if (d)
			dentry = d;
	}

	if (!(flags & O_CREAT) || d_really_is_positive(dentry)) {
		err = finish_no_open(file, d);
		goto out2;
	}

	file->f_mode |= FMODE_CREATED;

	/*
	 * fnd contains tree's path to insert to.
	 * If fnd is not NULL then dir is locked.
	 */

	/*
	 * Unfortunately I don't know how to get here correct 'struct nameidata *nd'
	 * or 'struct mnt_idmap *idmap'.
	 * See atomic_open in fs/namei.c.
	 * This is why xfstest/633 failed.
	 * Looks like ntfs_atomic_open must accept 'struct mnt_idmap *idmap' as argument.
	 */

	inode = ntfs_create_inode(&nop_mnt_idmap, dir, dentry, uni, mode, 0,
				  NULL, 0, fnd);
	err = IS_ERR(inode) ? PTR_ERR(inode)
			    : finish_open(file, dentry, ntfs_file_open);
	dput(d);

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

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

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

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

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

	return ERR_PTR(-ENOENT);
}

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

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

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

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

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

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

	sbi = dentry->d_sb->s_fs_info;

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

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

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

out:
	__putname(uni);
	return err;
}

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

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

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

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

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

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

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

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

	uni2 = Add2Ptr(uni1, 2048);

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

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

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

out:
	__putname(uni1);
	return ret;
}

// clang-format off
const struct inode_operations ntfs_dir_inode_operations = {
	.lookup		= ntfs_lookup,
	.create		= ntfs_create,
	.link		= ntfs_link,
	.unlink		= ntfs_unlink,
	.symlink	= ntfs_symlink,
	.mkdir		= ntfs_mkdir,
	.rmdir		= ntfs_rmdir,
	.mknod		= ntfs_mknod,
	.rename		= ntfs_rename,
	.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	{
4342306f KK	100	struct inode *inode;
4342306f KK	101
700b7940	102	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG \| mode,
4342306f KK	103	0, NULL, 0, NULL);
4342306f KK	104
4342306f KK	105	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	106	}
	107
	108	/*
	109	* ntfs_mknod
	110	*
	111	* inode_operations::mknod
	112	*/
5ebb29be	113	static int ntfs_mknod(struct mnt_idmap idmap, struct inode dir,
4342306f KK	114	struct dentry *dentry, umode_t mode, dev_t rdev)
4342306f KK	115	{
4342306f KK	116	struct inode *inode;
4342306f KK	117
700b7940	118	inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev,
4342306f KK	119	NULL, 0, NULL);
4342306f KK	120
4342306f KK	121	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	122	}
	123
	124	/*
e8b8e97f	125	* ntfs_link - inode_operations::link
4342306f KK	126	*/
	127	static int ntfs_link(struct dentry ode, struct inode dir, struct dentry *de)
	128	{
	129	int err;
	130	struct inode *inode = d_inode(ode);
	131	struct ntfs_inode *ni = ntfs_i(inode);
	132
	133	if (S_ISDIR(inode->i_mode))
	134	return -EPERM;
	135
	136	if (inode->i_nlink >= NTFS_LINK_MAX)
	137	return -EMLINK;
	138
	139	ni_lock_dir(ntfs_i(dir));
	140	if (inode != dir)
	141	ni_lock(ni);
	142
4342306f KK	143	inc_nlink(inode);
	144	ihold(inode);
	145
	146	err = ntfs_link_inode(inode, de);
78ab59fe	147
4342306f	148	if (!err) {
78ab59fe KK	149	dir->i_ctime = dir->i_mtime = inode->i_ctime =
78ab59fe KK	150	current_time(dir);
4342306f KK	151	mark_inode_dirty(inode);
	152	mark_inode_dirty(dir);
	153	d_instantiate(de, inode);
	154	} else {
	155	drop_nlink(inode);
	156	iput(inode);
	157	}
	158
	159	if (inode != dir)
	160	ni_unlock(ni);
	161	ni_unlock(ntfs_i(dir));
	162
	163	return err;
	164	}
	165
	166	/*
e8b8e97f	167	* ntfs_unlink - inode_operations::unlink
4342306f KK	168	*/
	169	static int ntfs_unlink(struct inode dir, struct dentry dentry)
	170	{
	171	struct ntfs_inode *ni = ntfs_i(dir);
	172	int err;
	173
	174	ni_lock_dir(ni);
	175
	176	err = ntfs_unlink_inode(dir, dentry);
	177
	178	ni_unlock(ni);
	179
	180	return err;
	181	}
	182
	183	/*
e8b8e97f	184	* ntfs_symlink - inode_operations::symlink
4342306f	185	*/
7a77db95	186	static int ntfs_symlink(struct mnt_idmap idmap, struct inode dir,
4342306f KK	187	struct dentry dentry, const char symname)
	188	{
	189	u32 size = strlen(symname);
	190	struct inode *inode;
4342306f	191
700b7940	192	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK \| 0777,
4342306f KK	193	0, symname, size, NULL);
4342306f KK	194
4342306f KK	195	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	196	}
	197
	198	/*
e8b8e97f	199	* ntfs_mkdir- inode_operations::mkdir
4342306f	200	*/
c54bd91e	201	static int ntfs_mkdir(struct mnt_idmap idmap, struct inode dir,
4342306f KK	202	struct dentry *dentry, umode_t mode)
	203	{
	204	struct inode *inode;
4342306f	205
700b7940	206	inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR \| mode,
4342306f KK	207	0, NULL, 0, NULL);
4342306f KK	208
4342306f KK	209	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
	210	}
	211
	212	/*
6700eabb	213	* ntfs_rmdir - inode_operations::rmdir
4342306f KK	214	*/
	215	static int ntfs_rmdir(struct inode dir, struct dentry dentry)
	216	{
	217	struct ntfs_inode *ni = ntfs_i(dir);
	218	int err;
	219
	220	ni_lock_dir(ni);
	221
	222	err = ntfs_unlink_inode(dir, dentry);
	223
	224	ni_unlock(ni);
	225
	226	return err;
	227	}
	228
	229	/*
e8b8e97f	230	* ntfs_rename - inode_operations::rename
4342306f	231	*/
e18275ae	232	static int ntfs_rename(struct mnt_idmap idmap, struct inode dir,
78ab59fe	233	struct dentry dentry, struct inode new_dir,
4342306f KK	234	struct dentry *new_dentry, u32 flags)
	235	{
	236	int err;
78ab59fe	237	struct super_block *sb = dir->i_sb;
4342306f	238	struct ntfs_sb_info *sbi = sb->s_fs_info;
78ab59fe	239	struct ntfs_inode *dir_ni = ntfs_i(dir);
4342306f	240	struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
78ab59fe KK	241	struct inode *inode = d_inode(dentry);
	242	struct ntfs_inode *ni = ntfs_i(inode);
	243	struct inode *new_inode = d_inode(new_dentry);
	244	struct NTFS_DE de, new_de;
	245	bool is_same, is_bad;
	246	/*
	247	* de - memory of PATH_MAX bytes:
	248	* [0-1024) - original name (dentry->d_name)
	249	* [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
	250	* [2048-3072) - new name (new_dentry->d_name)
	251	*/
4342306f KK	252	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
	253	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
	254	1024);
	255	static_assert(PATH_MAX >= 4 * 1024);
	256
	257	if (flags & ~RENAME_NOREPLACE)
	258	return -EINVAL;
	259
78ab59fe KK	260	is_same = dentry->d_name.len == new_dentry->d_name.len &&
	261	!memcmp(dentry->d_name.name, new_dentry->d_name.name,
	262	dentry->d_name.len);
4342306f	263
78ab59fe	264	if (is_same && dir == new_dir) {
e8b8e97f	265	/* Nothing to do. */
78ab59fe	266	return 0;
4342306f KK	267	}
4342306f KK	268
78ab59fe KK	269	if (ntfs_is_meta_file(sbi, inode->i_ino)) {
	270	/* Should we print an error? */
	271	return -EINVAL;
4342306f KK	272	}
	273
	274	if (new_inode) {
e8b8e97f	275	/* Target name exists. Unlink it. */
4342306f KK	276	dget(new_dentry);
	277	ni_lock_dir(new_dir_ni);
	278	err = ntfs_unlink_inode(new_dir, new_dentry);
	279	ni_unlock(new_dir_ni);
	280	dput(new_dentry);
	281	if (err)
78ab59fe	282	return err;
4342306f KK	283	}
4342306f KK	284
e8b8e97f	285	/* Allocate PATH_MAX bytes. */
78ab59fe KK	286	de = __getname();
	287	if (!de)
	288	return -ENOMEM;
4342306f	289
78ab59fe KK	290	/* Translate dentry->d_name into unicode form. */
78ab59fe KK	291	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
4342306f	292	if (err < 0)
78ab59fe	293	goto out;
4342306f KK	294
4342306f KK	295	if (is_same) {
78ab59fe KK	296	/* Reuse 'de'. */
78ab59fe KK	297	new_de = de;
4342306f	298	} else {
78ab59fe KK	299	/* Translate new_dentry->d_name into unicode form. */
78ab59fe KK	300	new_de = Add2Ptr(de, 2048);
4342306f KK	301	err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
4342306f KK	302	if (err < 0)
78ab59fe	303	goto out;
4342306f KK	304	}
4342306f KK	305
78ab59fe KK	306	ni_lock_dir(dir_ni);
78ab59fe KK	307	ni_lock(ni);
0ad9dfcb KK	308	if (dir_ni != new_dir_ni)
0ad9dfcb KK	309	ni_lock_dir2(new_dir_ni);
78ab59fe KK	310
	311	is_bad = false;
	312	err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
	313	if (is_bad) {
	314	/* Restore after failed rename failed too. */
c12df45e	315	_ntfs_bad_inode(inode);
78ab59fe KK	316	} else if (!err) {
	317	inode->i_ctime = dir->i_ctime = dir->i_mtime =
	318	current_time(dir);
	319	mark_inode_dirty(inode);
	320	mark_inode_dirty(dir);
	321	if (dir != new_dir) {
	322	new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime;
	323	mark_inode_dirty(new_dir);
4342306f	324	}
4342306f	325
78ab59fe KK	326	if (IS_DIRSYNC(dir))
78ab59fe KK	327	ntfs_sync_inode(dir);
4342306f	328
78ab59fe KK	329	if (IS_DIRSYNC(new_dir))
78ab59fe KK	330	ntfs_sync_inode(inode);
4342306f KK	331	}
4342306f KK	332
0ad9dfcb KK	333	if (dir_ni != new_dir_ni)
0ad9dfcb KK	334	ni_unlock(new_dir_ni);
78ab59fe KK	335	ni_unlock(ni);
78ab59fe KK	336	ni_unlock(dir_ni);
4342306f	337	out:
78ab59fe	338	__putname(de);
4342306f KK	339	return err;
	340	}
	341
2b108260 KK	342	/*
	343	* ntfs_atomic_open
	344	*
	345	* inode_operations::atomic_open
	346	*/
	347	static int ntfs_atomic_open(struct inode dir, struct dentry dentry,
	348	struct file *file, u32 flags, umode_t mode)
	349	{
	350	int err;
	351	struct inode *inode;
	352	struct ntfs_fnd *fnd = NULL;
	353	struct ntfs_inode *ni = ntfs_i(dir);
	354	struct dentry *d = NULL;
	355	struct cpu_str *uni = __getname();
	356	bool locked = false;
	357
	358	if (!uni)
	359	return -ENOMEM;
	360
	361	err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
	362	dentry->d_name.len, uni, NTFS_NAME_LEN,
	363	UTF16_HOST_ENDIAN);
	364	if (err < 0)
	365	goto out;
	366
	367	#ifdef CONFIG_NTFS3_FS_POSIX_ACL
	368	if (IS_POSIXACL(dir)) {
	369	/*
	370	* Load in cache current acl to avoid ni_lock(dir):
	371	* ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
	372	* ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
	373	*/
6022ec6e	374	struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
2b108260 KK	375
	376	if (IS_ERR(p)) {
	377	err = PTR_ERR(p);
	378	goto out;
	379	}
	380	posix_acl_release(p);
	381	}
	382	#endif
	383
	384	if (d_in_lookup(dentry)) {
	385	ni_lock_dir(ni);
	386	locked = true;
	387	fnd = fnd_get();
	388	if (!fnd) {
	389	err = -ENOMEM;
	390	goto out1;
	391	}
	392
	393	d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
	394	if (IS_ERR(d)) {
	395	err = PTR_ERR(d);
	396	d = NULL;
	397	goto out2;
	398	}
	399
	400	if (d)
	401	dentry = d;
	402	}
	403
	404	if (!(flags & O_CREAT) \|\| d_really_is_positive(dentry)) {
	405	err = finish_no_open(file, d);
	406	goto out2;
	407	}
	408
	409	file->f_mode \|= FMODE_CREATED;
	410
	411	/*
	412	* fnd contains tree's path to insert to.
	413	* If fnd is not NULL then dir is locked.
	414	*/
	415
	416	/*
	417	* Unfortunately I don't know how to get here correct 'struct nameidata *nd'
700b7940	418	* or 'struct mnt_idmap *idmap'.
2b108260 KK	419	* See atomic_open in fs/namei.c.
2b108260 KK	420	* This is why xfstest/633 failed.
700b7940	421	* Looks like ntfs_atomic_open must accept 'struct mnt_idmap *idmap' as argument.
2b108260 KK	422	*/
2b108260 KK	423
700b7940	424	inode = ntfs_create_inode(&nop_mnt_idmap, dir, dentry, uni, mode, 0,
2b108260 KK	425	NULL, 0, fnd);
	426	err = IS_ERR(inode) ? PTR_ERR(inode)
	427	: finish_open(file, dentry, ntfs_file_open);
	428	dput(d);
	429
	430	out2:
	431	fnd_put(fnd);
	432	out1:
	433	if (locked)
	434	ni_unlock(ni);
	435	out:
	436	__putname(uni);
	437	return err;
	438	}
	439
4342306f KK	440	struct dentry ntfs3_get_parent(struct dentry child)
	441	{
	442	struct inode *inode = d_inode(child);
	443	struct ntfs_inode *ni = ntfs_i(inode);
	444
	445	struct ATTR_LIST_ENTRY *le = NULL;
	446	struct ATTRIB *attr = NULL;
	447	struct ATTR_FILE_NAME *fname;
	448
	449	while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
	450	NULL))) {
	451	fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
	452	if (!fname)
	453	continue;
	454
	455	return d_obtain_alias(
	456	ntfs_iget5(inode->i_sb, &fname->home, NULL));
	457	}
	458
	459	return ERR_PTR(-ENOENT);
	460	}
	461
a3a956c7 KK	462	/*
	463	* dentry_operations::d_hash
	464	*/
	465	static int ntfs_d_hash(const struct dentry dentry, struct qstr name)
	466	{
	467	struct ntfs_sb_info *sbi;
	468	const char *n = name->name;
	469	unsigned int len = name->len;
	470	unsigned long hash;
	471	struct cpu_str *uni;
	472	unsigned int c;
	473	int err;
	474
	475	/* First try fast implementation. */
	476	hash = init_name_hash(dentry);
	477
	478	for (;;) {
	479	if (!len--) {
	480	name->hash = end_name_hash(hash);
	481	return 0;
	482	}
	483
	484	c = *n++;
	485	if (c >= 0x80)
	486	break;
	487
	488	hash = partial_name_hash(toupper(c), hash);
	489	}
	490
	491	/*
	492	* Try slow way with current upcase table
	493	*/
	494	uni = __getname();
	495	if (!uni)
	496	return -ENOMEM;
	497
	498	sbi = dentry->d_sb->s_fs_info;
	499
	500	err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
	501	UTF16_HOST_ENDIAN);
	502	if (err < 0)
	503	goto out;
	504
	505	if (!err) {
	506	err = -EINVAL;
	507	goto out;
	508	}
	509
	510	hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
	511	init_name_hash(dentry));
	512	name->hash = end_name_hash(hash);
	513	err = 0;
	514
	515	out:
	516	__putname(uni);
	517	return err;
	518	}
	519
	520	/*
	521	* dentry_operations::d_compare
	522	*/
	523	static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
	524	const char str, const struct qstr name)
	525	{
526	struct ntfs_sb_info *sbi;
527	int ret;
528	const char *n1 = str;
529	const char *n2 = name->name;
530	unsigned int len2 = name->len;
531	unsigned int lm = min(len1, len2);
532	unsigned char c1, c2;
9144b438 KK	533	struct cpu_str *uni1;
9144b438 KK	534	struct le_str *uni2;
a3a956c7 KK	535
	536	/* First try fast implementation. */
	537	for (;;) {
0d6d7c61	538	if (!lm--)
75b5e472	539	return len1 != len2;
a3a956c7 KK	540
	541	if ((c1 = n1++) == (c2 = n2++))
	542	continue;
	543
	544	if (c1 >= 0x80 \|\| c2 >= 0x80)
	545	break;
	546
0d6d7c61 NC	547	if (toupper(c1) != toupper(c2))
0d6d7c61 NC	548	return 1;
a3a956c7 KK	549	}
	550
	551	/*
	552	* Try slow way with current upcase table
	553	*/
	554	sbi = dentry->d_sb->s_fs_info;
	555	uni1 = __getname();
	556	if (!uni1)
	557	return -ENOMEM;
	558
	559	ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
	560	UTF16_HOST_ENDIAN);
	561	if (ret < 0)
	562	goto out;
	563
	564	if (!ret) {
	565	ret = -EINVAL;
	566	goto out;
	567	}
	568
	569	uni2 = Add2Ptr(uni1, 2048);
	570
9144b438 KK	571	ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
	572	(struct cpu_str *)uni2, NTFS_NAME_LEN,
	573	UTF16_LITTLE_ENDIAN);
a3a956c7 KK	574	if (ret < 0)
	575	goto out;
	576
	577	if (!ret) {
	578	ret = -EINVAL;
	579	goto out;
	580	}
	581
9144b438	582	ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;
a3a956c7 KK	583
	584	out:
	585	__putname(uni1);
	586	return ret;
	587	}
	588
4342306f KK	589	// clang-format off
	590	const struct inode_operations ntfs_dir_inode_operations = {
	591	.lookup = ntfs_lookup,
	592	.create = ntfs_create,
	593	.link = ntfs_link,
	594	.unlink = ntfs_unlink,
	595	.symlink = ntfs_symlink,
	596	.mkdir = ntfs_mkdir,
	597	.rmdir = ntfs_rmdir,
	598	.mknod = ntfs_mknod,
	599	.rename = ntfs_rename,
	600	.permission = ntfs_permission,
cac2f8b8	601	.get_inode_acl = ntfs_get_acl,
4342306f KK	602	.set_acl = ntfs_set_acl,
	603	.setattr = ntfs3_setattr,
	604	.getattr = ntfs_getattr,
	605	.listxattr = ntfs_listxattr,
2b108260	606	.atomic_open = ntfs_atomic_open,
4342306f KK	607	.fiemap = ntfs_fiemap,
	608	};
	609
	610	const struct inode_operations ntfs_special_inode_operations = {
	611	.setattr = ntfs3_setattr,
	612	.getattr = ntfs_getattr,
	613	.listxattr = ntfs_listxattr,
cac2f8b8	614	.get_inode_acl = ntfs_get_acl,
4342306f KK	615	.set_acl = ntfs_set_acl,
4342306f KK	616	};
a3a956c7 KK	617
	618	const struct dentry_operations ntfs_dentry_ops = {
	619	.d_hash = ntfs_d_hash,
	620	.d_compare = ntfs_d_compare,
	621	};
	622
4342306f	623	// clang-format on