fs/ntfs3: Add attrib operations

This adds attrib operations

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

1 files changed, 1128 insertions, 0 deletions

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
new file mode 100644
index 000000000000..98871c895e77
--- /dev/null
+++ b/fs/ntfs3/xattr.c
@@ -0,0 +1,1128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/nls.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/xattr.h>
+
+#include "debug.h"
+#include "ntfs.h"
+#include "ntfs_fs.h"
+
+// clang-format off
+#define SYSTEM_DOS_ATTRIB    "system.dos_attrib"
+#define SYSTEM_NTFS_ATTRIB   "system.ntfs_attrib"
+#define SYSTEM_NTFS_SECURITY "system.ntfs_security"
+// clang-format on
+
+static inline size_t unpacked_ea_size(const struct EA_FULL *ea)
+{
+	return ea->size ? le32_to_cpu(ea->size)
+			: DwordAlign(struct_size(
+				  ea, name,
+				  1 + ea->name_len + le16_to_cpu(ea->elength)));
+}
+
+static inline size_t packed_ea_size(const struct EA_FULL *ea)
+{
+	return struct_size(ea, name,
+			   1 + ea->name_len + le16_to_cpu(ea->elength)) -
+	       offsetof(struct EA_FULL, flags);
+}
+
+/*
+ * find_ea
+ *
+ * assume there is at least one xattr in the list
+ */
+static inline bool find_ea(const struct EA_FULL *ea_all, u32 bytes,
+			   const char *name, u8 name_len, u32 *off)
+{
+	*off = 0;
+
+	if (!ea_all || !bytes)
+		return false;
+
+	for (;;) {
+		const struct EA_FULL *ea = Add2Ptr(ea_all, *off);
+		u32 next_off = *off + unpacked_ea_size(ea);
+
+		if (next_off > bytes)
+			return false;
+
+		if (ea->name_len == name_len &&
+		    !memcmp(ea->name, name, name_len))
+			return true;
+
+		*off = next_off;
+		if (next_off >= bytes)
+			return false;
+	}
+}
+
+/*
+ * ntfs_read_ea
+ *
+ * reads all extended attributes
+ * ea - new allocated memory
+ * info - pointer into resident data
+ */
+static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
+			size_t add_bytes, const struct EA_INFO **info)
+{
+	int err;
+	struct ATTR_LIST_ENTRY *le = NULL;
+	struct ATTRIB *attr_info, *attr_ea;
+	void *ea_p;
+	u32 size;
+
+	static_assert(le32_to_cpu(ATTR_EA_INFO) < le32_to_cpu(ATTR_EA));
+
+	*ea = NULL;
+	*info = NULL;
+
+	attr_info =
+		ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, NULL);
+	attr_ea =
+		ni_find_attr(ni, attr_info, &le, ATTR_EA, NULL, 0, NULL, NULL);
+
+	if (!attr_ea || !attr_info)
+		return 0;
+
+	*info = resident_data_ex(attr_info, sizeof(struct EA_INFO));
+	if (!*info)
+		return -EINVAL;
+
+	/* Check Ea limit */
+	size = le32_to_cpu((*info)->size);
+	if (size > ni->mi.sbi->ea_max_size)
+		return -EFBIG;
+
+	if (attr_size(attr_ea) > ni->mi.sbi->ea_max_size)
+		return -EFBIG;
+
+	/* Allocate memory for packed Ea */
+	ea_p = ntfs_malloc(size + add_bytes);
+	if (!ea_p)
+		return -ENOMEM;
+
+	if (attr_ea->non_res) {
+		struct runs_tree run;
+
+		run_init(&run);
+
+		err = attr_load_runs(attr_ea, ni, &run, NULL);
+		if (!err)
+			err = ntfs_read_run_nb(ni->mi.sbi, &run, 0, ea_p, size,
+					       NULL);
+		run_close(&run);
+
+		if (err)
+			goto out;
+	} else {
+		void *p = resident_data_ex(attr_ea, size);
+
+		if (!p) {
+			err = -EINVAL;
+			goto out;
+		}
+		memcpy(ea_p, p, size);
+	}
+
+	memset(Add2Ptr(ea_p, size), 0, add_bytes);
+	*ea = ea_p;
+	return 0;
+
+out:
+	ntfs_free(ea_p);
+	*ea = NULL;
+	return err;
+}
+
+/*
+ * ntfs_list_ea
+ *
+ * copy a list of xattrs names into the buffer
+ * provided, or compute the buffer size required
+ *
+ * Returns a negative error number on failure, or the number of bytes
+ * used / required on success.
+ */
+static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
+			    size_t bytes_per_buffer)
+{
+	const struct EA_INFO *info;
+	struct EA_FULL *ea_all = NULL;
+	const struct EA_FULL *ea;
+	u32 off, size;
+	int err;
+	size_t ret;
+
+	err = ntfs_read_ea(ni, &ea_all, 0, &info);
+	if (err)
+		return err;
+
+	if (!info || !ea_all)
+		return 0;
+
+	size = le32_to_cpu(info->size);
+
+	/* Enumerate all xattrs */
+	for (ret = 0, off = 0; off < size; off += unpacked_ea_size(ea)) {
+		ea = Add2Ptr(ea_all, off);
+
+		if (buffer) {
+			if (ret + ea->name_len + 1 > bytes_per_buffer) {
+				err = -ERANGE;
+				goto out;
+			}
+
+			memcpy(buffer + ret, ea->name, ea->name_len);
+			buffer[ret + ea->name_len] = 0;
+		}
+
+		ret += ea->name_len + 1;
+	}
+
+out:
+	ntfs_free(ea_all);
+	return err ? err : ret;
+}
+
+static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
+		       void *buffer, size_t size, size_t *required)
+{
+	struct ntfs_inode *ni = ntfs_i(inode);
+	const struct EA_INFO *info;
+	struct EA_FULL *ea_all = NULL;
+	const struct EA_FULL *ea;
+	u32 off, len;
+	int err;
+
+	if (!(ni->ni_flags & NI_FLAG_EA))
+		return -ENODATA;
+
+	if (!required)
+		ni_lock(ni);
+
+	len = 0;
+
+	if (name_len > 255) {
+		err = -ENAMETOOLONG;
+		goto out;
+	}
+
+	err = ntfs_read_ea(ni, &ea_all, 0, &info);
+	if (err)
+		goto out;
+
+	if (!info)
+		goto out;
+
+	/* Enumerate all xattrs */
+	if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off)) {
+		err = -ENODATA;
+		goto out;
+	}
+	ea = Add2Ptr(ea_all, off);
+
+	len = le16_to_cpu(ea->elength);
+	if (!buffer) {
+		err = 0;
+		goto out;
+	}
+
+	if (len > size) {
+		err = -ERANGE;
+		if (required)
+			*required = len;
+		goto out;
+	}
+
+	memcpy(buffer, ea->name + ea->name_len + 1, len);
+	err = 0;
+
+out:
+	ntfs_free(ea_all);
+	if (!required)
+		ni_unlock(ni);
+
+	return err ? err : len;
+}
+
+static noinline int ntfs_set_ea(struct inode *inode, const char *name,
+				size_t name_len, const void *value,
+				size_t val_size, int flags, int locked)
+{
+	struct ntfs_inode *ni = ntfs_i(inode);
+	struct ntfs_sb_info *sbi = ni->mi.sbi;
+	int err;
+	struct EA_INFO ea_info;
+	const struct EA_INFO *info;
+	struct EA_FULL *new_ea;
+	struct EA_FULL *ea_all = NULL;
+	size_t add, new_pack;
+	u32 off, size;
+	__le16 size_pack;
+	struct ATTRIB *attr;
+	struct ATTR_LIST_ENTRY *le;
+	struct mft_inode *mi;
+	struct runs_tree ea_run;
+	u64 new_sz;
+	void *p;
+
+	if (!locked)
+		ni_lock(ni);
+
+	run_init(&ea_run);
+
+	if (name_len > 255) {
+		err = -ENAMETOOLONG;
+		goto out;
+	}
+
+	add = DwordAlign(struct_size(ea_all, name, 1 + name_len + val_size));
+
+	err = ntfs_read_ea(ni, &ea_all, add, &info);
+	if (err)
+		goto out;
+
+	if (!info) {
+		memset(&ea_info, 0, sizeof(ea_info));
+		size = 0;
+		size_pack = 0;
+	} else {
+		memcpy(&ea_info, info, sizeof(ea_info));
+		size = le32_to_cpu(ea_info.size);
+		size_pack = ea_info.size_pack;
+	}
+
+	if (info && find_ea(ea_all, size, name, name_len, &off)) {
+		struct EA_FULL *ea;
+		size_t ea_sz;
+
+		if (flags & XATTR_CREATE) {
+			err = -EEXIST;
+			goto out;
+		}
+
+		ea = Add2Ptr(ea_all, off);
+
+		/*
+		 * Check simple case when we try to insert xattr with the same value
+		 * e.g. ntfs_save_wsl_perm
+		 */
+		if (val_size && le16_to_cpu(ea->elength) == val_size &&
+		    !memcmp(ea->name + ea->name_len + 1, value, val_size)) {
+			/* xattr already contains the required value */
+			goto out;
+		}
+
+		/* Remove current xattr */
+		if (ea->flags & FILE_NEED_EA)
+			le16_add_cpu(&ea_info.count, -1);
+
+		ea_sz = unpacked_ea_size(ea);
+
+		le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
+
+		memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
+
+		size -= ea_sz;
+		memset(Add2Ptr(ea_all, size), 0, ea_sz);
+
+		ea_info.size = cpu_to_le32(size);
+
+		if ((flags & XATTR_REPLACE) && !val_size) {
+			/* remove xattr */
+			goto update_ea;
+		}
+	} else {
+		if (flags & XATTR_REPLACE) {
+			err = -ENODATA;
+			goto out;
+		}
+
+		if (!ea_all) {
+			ea_all = ntfs_zalloc(add);
+			if (!ea_all) {
+				err = -ENOMEM;
+				goto out;
+			}
+		}
+	}
+
+	/* append new xattr */
+	new_ea = Add2Ptr(ea_all, size);
+	new_ea->size = cpu_to_le32(add);
+	new_ea->flags = 0;
+	new_ea->name_len = name_len;
+	new_ea->elength = cpu_to_le16(val_size);
+	memcpy(new_ea->name, name, name_len);
+	new_ea->name[name_len] = 0;
+	memcpy(new_ea->name + name_len + 1, value, val_size);
+	new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
+
+	/* should fit into 16 bits */
+	if (new_pack > 0xffff) {
+		err = -EFBIG; // -EINVAL?
+		goto out;
+	}
+	ea_info.size_pack = cpu_to_le16(new_pack);
+
+	/* new size of ATTR_EA */
+	size += add;
+	if (size > sbi->ea_max_size) {
+		err = -EFBIG; // -EINVAL?
+		goto out;
+	}
+	ea_info.size = cpu_to_le32(size);
+
+update_ea:
+
+	if (!info) {
+		/* Create xattr */
+		if (!size) {
+			err = 0;
+			goto out;
+		}
+
+		err = ni_insert_resident(ni, sizeof(struct EA_INFO),
+					 ATTR_EA_INFO, NULL, 0, NULL, NULL);
+		if (err)
+			goto out;
+
+		err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL);
+		if (err)
+			goto out;
+	}
+
+	new_sz = size;
+	err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
+			    false, NULL);
+	if (err)
+		goto out;
+
+	le = NULL;
+	attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
+	if (!attr) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (!size) {
+		/* delete xattr, ATTR_EA_INFO */
+		err = ni_remove_attr_le(ni, attr, le);
+		if (err)
+			goto out;
+	} else {
+		p = resident_data_ex(attr, sizeof(struct EA_INFO));
+		if (!p) {
+			err = -EINVAL;
+			goto out;
+		}
+		memcpy(p, &ea_info, sizeof(struct EA_INFO));
+		mi->dirty = true;
+	}
+
+	le = NULL;
+	attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
+	if (!attr) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (!size) {
+		/* delete xattr, ATTR_EA */
+		err = ni_remove_attr_le(ni, attr, le);
+		if (err)
+			goto out;
+	} else if (attr->non_res) {
+		err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size);
+		if (err)
+			goto out;
+	} else {
+		p = resident_data_ex(attr, size);
+		if (!p) {
+			err = -EINVAL;
+			goto out;
+		}
+		memcpy(p, ea_all, size);
+		mi->dirty = true;
+	}
+
+	/* Check if we delete the last xattr */
+	if (size)
+		ni->ni_flags |= NI_FLAG_EA;
+	else
+		ni->ni_flags &= ~NI_FLAG_EA;
+
+	if (ea_info.size_pack != size_pack)
+		ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
+	mark_inode_dirty(&ni->vfs_inode);
+
+out:
+	if (!locked)
+		ni_unlock(ni);
+
+	run_close(&ea_run);
+	ntfs_free(ea_all);
+
+	return err;
+}
+
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+static inline void ntfs_posix_acl_release(struct posix_acl *acl)
+{
+	if (acl && refcount_dec_and_test(&acl->a_refcount))
+		kfree(acl);
+}
+
+static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns,
+					 struct inode *inode, int type,
+					 int locked)
+{
+	struct ntfs_inode *ni = ntfs_i(inode);
+	const char *name;
+	size_t name_len;
+	struct posix_acl *acl;
+	size_t req;
+	int err;
+	void *buf;
+
+	/* allocate PATH_MAX bytes */
+	buf = __getname();
+	if (!buf)
+		return ERR_PTR(-ENOMEM);
+
+	/* Possible values of 'type' was already checked above */
+	if (type == ACL_TYPE_ACCESS) {
+		name = XATTR_NAME_POSIX_ACL_ACCESS;
+		name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
+	} else {
+		name = XATTR_NAME_POSIX_ACL_DEFAULT;
+		name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
+	}
+
+	if (!locked)
+		ni_lock(ni);
+
+	err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
+
+	if (!locked)
+		ni_unlock(ni);
+
+	/* Translate extended attribute to acl */
+	if (err > 0) {
+		acl = posix_acl_from_xattr(mnt_userns, buf, err);
+		if (!IS_ERR(acl))
+			set_cached_acl(inode, type, acl);
+	} else {
+		acl = err == -ENODATA ? NULL : ERR_PTR(err);
+	}
+
+	__putname(buf);
+
+	return acl;
+}
+
+/*
+ * ntfs_get_acl
+ *
+ * inode_operations::get_acl
+ */
+struct posix_acl *ntfs_get_acl(struct inode *inode, int type)
+{
+	/* TODO: init_user_ns? */
+	return ntfs_get_acl_ex(&init_user_ns, inode, type, 0);
+}
+
+static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
+				    struct inode *inode, struct posix_acl *acl,
+				    int type, int locked)
+{
+	const char *name;
+	size_t size, name_len;
+	void *value = NULL;
+	int err = 0;
+
+	if (S_ISLNK(inode->i_mode))
+		return -EOPNOTSUPP;
+
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		if (acl) {
+			umode_t mode = inode->i_mode;
+
+			err = posix_acl_equiv_mode(acl, &mode);
+			if (err < 0)
+				return err;
+
+			if (inode->i_mode != mode) {
+				inode->i_mode = mode;
+				mark_inode_dirty(inode);
+			}
+
+			if (!err) {
+				/*
+				 * acl can be exactly represented in the
+				 * traditional file mode permission bits
+				 */
+				acl = NULL;
+			}
+		}
+		name = XATTR_NAME_POSIX_ACL_ACCESS;
+		name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
+		break;
+
+	case ACL_TYPE_DEFAULT:
+		if (!S_ISDIR(inode->i_mode))
+			return acl ? -EACCES : 0;
+		name = XATTR_NAME_POSIX_ACL_DEFAULT;
+		name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (!acl) {
+		size = 0;
+		value = NULL;
+	} else {
+		size = posix_acl_xattr_size(acl->a_count);
+		value = ntfs_malloc(size);
+		if (!value)
+			return -ENOMEM;
+
+		err = posix_acl_to_xattr(mnt_userns, acl, value, size);
+		if (err < 0)
+			goto out;
+	}
+
+	err = ntfs_set_ea(inode, name, name_len, value, size,
+			  acl ? 0 : XATTR_REPLACE, locked);
+	if (!err)
+		set_cached_acl(inode, type, acl);
+
+out:
+	ntfs_free(value);
+
+	return err;
+}
+
+/*
+ * ntfs_set_acl
+ *
+ * inode_operations::set_acl
+ */
+int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
+{
+	return ntfs_set_acl_ex(mnt_userns, inode, acl, type, 0);
+}
+
+static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
+			      struct inode *inode, int type, void *buffer,
+			      size_t size)
+{
+	struct posix_acl *acl;
+	int err;
+
+	if (!(inode->i_sb->s_flags & SB_POSIXACL))
+		return -EOPNOTSUPP;
+
+	acl = ntfs_get_acl(inode, type);
+	if (IS_ERR(acl))
+		return PTR_ERR(acl);
+
+	if (!acl)
+		return -ENODATA;
+
+	err = posix_acl_to_xattr(mnt_userns, acl, buffer, size);
+	ntfs_posix_acl_release(acl);
+
+	return err;
+}
+
+static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
+			      struct inode *inode, int type, const void *value,
+			      size_t size)
+{
+	struct posix_acl *acl;
+	int err;
+
+	if (!(inode->i_sb->s_flags & SB_POSIXACL))
+		return -EOPNOTSUPP;
+
+	if (!inode_owner_or_capable(mnt_userns, inode))
+		return -EPERM;
+
+	if (!value) {
+		acl = NULL;
+	} else {
+		acl = posix_acl_from_xattr(mnt_userns, value, size);
+		if (IS_ERR(acl))
+			return PTR_ERR(acl);
+
+		if (acl) {
+			err = posix_acl_valid(mnt_userns, acl);
+			if (err)
+				goto release_and_out;
+		}
+	}
+
+	err = ntfs_set_acl(mnt_userns, inode, acl, type);
+
+release_and_out:
+	ntfs_posix_acl_release(acl);
+	return err;
+}
+
+/*
+ * Initialize the ACLs of a new inode. Called from ntfs_create_inode.
+ */
+int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		  struct inode *dir)
+{
+	struct posix_acl *default_acl, *acl;
+	int err;
+
+	/*
+	 * TODO refactoring lock
+	 * ni_lock(dir) ... -> posix_acl_create(dir,...) -> ntfs_get_acl -> ni_lock(dir)
+	 */
+	inode->i_default_acl = NULL;
+
+	default_acl = ntfs_get_acl_ex(mnt_userns, dir, ACL_TYPE_DEFAULT, 1);
+
+	if (!default_acl || default_acl == ERR_PTR(-EOPNOTSUPP)) {
+		inode->i_mode &= ~current_umask();
+		err = 0;
+		goto out;
+	}
+
+	if (IS_ERR(default_acl)) {
+		err = PTR_ERR(default_acl);
+		goto out;
+	}
+
+	acl = default_acl;
+	err = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+	if (err < 0)
+		goto out1;
+	if (!err) {
+		posix_acl_release(acl);
+		acl = NULL;
+	}
+
+	if (!S_ISDIR(inode->i_mode)) {
+		posix_acl_release(default_acl);
+		default_acl = NULL;
+	}
+
+	if (default_acl)
+		err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
+				      ACL_TYPE_DEFAULT, 1);
+
+	if (!acl)
+		inode->i_acl = NULL;
+	else if (!err)
+		err = ntfs_set_acl_ex(mnt_userns, inode, acl, ACL_TYPE_ACCESS,
+				      1);
+
+	posix_acl_release(acl);
+out1:
+	posix_acl_release(default_acl);
+
+out:
+	return err;
+}
+#endif
+
+/*
+ * ntfs_acl_chmod
+ *
+ * helper for 'ntfs3_setattr'
+ */
+int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+
+	if (!(sb->s_flags & SB_POSIXACL))
+		return 0;
+
+	if (S_ISLNK(inode->i_mode))
+		return -EOPNOTSUPP;
+
+	return posix_acl_chmod(mnt_userns, inode, inode->i_mode);
+}
+
+/*
+ * ntfs_permission
+ *
+ * inode_operations::permission
+ */
+int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		    int mask)
+{
+	if (ntfs_sb(inode->i_sb)->options.no_acs_rules) {
+		/* "no access rules" mode - allow all changes */
+		return 0;
+	}
+
+	return generic_permission(mnt_userns, inode, mask);
+}
+
+/*
+ * ntfs_listxattr
+ *
+ * inode_operations::listxattr
+ */
+ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+	struct inode *inode = d_inode(dentry);
+	struct ntfs_inode *ni = ntfs_i(inode);
+	ssize_t ret;
+
+	if (!(ni->ni_flags & NI_FLAG_EA)) {
+		/* no xattr in file */
+		return 0;
+	}
+
+	ni_lock(ni);
+
+	ret = ntfs_list_ea(ni, buffer, size);
+
+	ni_unlock(ni);
+
+	return ret;
+}
+
+static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
+			 struct inode *inode, const char *name, void *buffer,
+			 size_t size)
+{
+	int err;
+	struct ntfs_inode *ni = ntfs_i(inode);
+	size_t name_len = strlen(name);
+
+	/* Dispatch request */
+	if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
+	    !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
+		/* system.dos_attrib */
+		if (!buffer) {
+			err = sizeof(u8);
+		} else if (size < sizeof(u8)) {
+			err = -ENODATA;
+		} else {
+			err = sizeof(u8);
+			*(u8 *)buffer = le32_to_cpu(ni->std_fa);
+		}
+		goto out;
+	}
+
+	if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
+	    !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
+		/* system.ntfs_attrib */
+		if (!buffer) {
+			err = sizeof(u32);
+		} else if (size < sizeof(u32)) {
+			err = -ENODATA;
+		} else {
+			err = sizeof(u32);
+			*(u32 *)buffer = le32_to_cpu(ni->std_fa);
+		}
+		goto out;
+	}
+
+	if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
+	    !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
+		/* system.ntfs_security*/
+		struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
+		size_t sd_size = 0;
+
+		if (!is_ntfs3(ni->mi.sbi)) {
+			/* we should get nt4 security */
+			err = -EINVAL;
+			goto out;
+		} else if (le32_to_cpu(ni->std_security_id) <
+			   SECURITY_ID_FIRST) {
+			err = -ENOENT;
+			goto out;
+		}
+
+		err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
+					      &sd, &sd_size);
+		if (err)
+			goto out;
+
+		if (!is_sd_valid(sd, sd_size)) {
+			ntfs_inode_warn(
+				inode,
+				"looks like you get incorrect security descriptor id=%u",
+				ni->std_security_id);
+		}
+
+		if (!buffer) {
+			err = sd_size;
+		} else if (size < sd_size) {
+			err = -ENODATA;
+		} else {
+			err = sd_size;
+			memcpy(buffer, sd, sd_size);
+		}
+		ntfs_free(sd);
+		goto out;
+	}
+
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+	if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
+	     !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
+		     sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
+	    (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
+	     !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
+		     sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
+		/* TODO: init_user_ns? */
+		err = ntfs_xattr_get_acl(
+			&init_user_ns, inode,
+			name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
+				? ACL_TYPE_ACCESS
+				: ACL_TYPE_DEFAULT,
+			buffer, size);
+		goto out;
+	}
+#endif
+	/* deal with ntfs extended attribute */
+	err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL);
+
+out:
+	return err;
+}
+
+/*
+ * ntfs_setxattr
+ *
+ * inode_operations::setxattr
+ */
+static noinline int ntfs_setxattr(const struct xattr_handler *handler,
+				  struct user_namespace *mnt_userns,
+				  struct dentry *de, struct inode *inode,
+				  const char *name, const void *value,
+				  size_t size, int flags)
+{
+	int err = -EINVAL;
+	struct ntfs_inode *ni = ntfs_i(inode);
+	size_t name_len = strlen(name);
+	enum FILE_ATTRIBUTE new_fa;
+
+	/* Dispatch request */
+	if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
+	    !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
+		if (sizeof(u8) != size)
+			goto out;
+		new_fa = cpu_to_le32(*(u8 *)value);
+		goto set_new_fa;
+	}
+
+	if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
+	    !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
+		if (size != sizeof(u32))
+			goto out;
+		new_fa = cpu_to_le32(*(u32 *)value);
+
+		if (S_ISREG(inode->i_mode)) {
+			/* Process compressed/sparsed in special way*/
+			ni_lock(ni);
+			err = ni_new_attr_flags(ni, new_fa);
+			ni_unlock(ni);
+			if (err)
+				goto out;
+		}
+set_new_fa:
+		/*
+		 * Thanks Mark Harmstone:
+		 * keep directory bit consistency
+		 */
+		if (S_ISDIR(inode->i_mode))
+			new_fa |= FILE_ATTRIBUTE_DIRECTORY;
+		else
+			new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
+
+		if (ni->std_fa != new_fa) {
+			ni->std_fa = new_fa;
+			if (new_fa & FILE_ATTRIBUTE_READONLY)
+				inode->i_mode &= ~0222;
+			else
+				inode->i_mode |= 0222;
+			/* std attribute always in primary record */
+			ni->mi.dirty = true;
+			mark_inode_dirty(inode);
+		}
+		err = 0;
+
+		goto out;
+	}
+
+	if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
+	    !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
+		/* system.ntfs_security*/
+		__le32 security_id;
+		bool inserted;
+		struct ATTR_STD_INFO5 *std;
+
+		if (!is_ntfs3(ni->mi.sbi)) {
+			/*
+			 * we should replace ATTR_SECURE
+			 * Skip this way cause it is nt4 feature
+			 */
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (!is_sd_valid(value, size)) {
+			err = -EINVAL;
+			ntfs_inode_warn(
+				inode,
+				"you try to set invalid security descriptor");
+			goto out;
+		}
+
+		err = ntfs_insert_security(ni->mi.sbi, value, size,
+					   &security_id, &inserted);
+		if (err)
+			goto out;
+
+		ni_lock(ni);
+		std = ni_std5(ni);
+		if (!std) {
+			err = -EINVAL;
+		} else if (std->security_id != security_id) {
+			std->security_id = ni->std_security_id = security_id;
+			/* std attribute always in primary record */
+			ni->mi.dirty = true;
+			mark_inode_dirty(&ni->vfs_inode);
+		}
+		ni_unlock(ni);
+		goto out;
+	}
+
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+	if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
+	     !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
+		     sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
+	    (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
+	     !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
+		     sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
+		err = ntfs_xattr_set_acl(
+			mnt_userns, inode,
+			name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
+				? ACL_TYPE_ACCESS
+				: ACL_TYPE_DEFAULT,
+			value, size);
+		goto out;
+	}
+#endif
+	/* deal with ntfs extended attribute */
+	err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
+
+out:
+	return err;
+}
+
+/*
+ * ntfs_save_wsl_perm
+ *
+ * save uid/gid/mode in xattr
+ */
+int ntfs_save_wsl_perm(struct inode *inode)
+{
+	int err;
+	__le32 value;
+
+	value = cpu_to_le32(i_uid_read(inode));
+	err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
+			  sizeof(value), 0, 0);
+	if (err)
+		goto out;
+
+	value = cpu_to_le32(i_gid_read(inode));
+	err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
+			  sizeof(value), 0, 0);
+	if (err)
+		goto out;
+
+	value = cpu_to_le32(inode->i_mode);
+	err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
+			  sizeof(value), 0, 0);
+	if (err)
+		goto out;
+
+	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+		value = cpu_to_le32(inode->i_rdev);
+		err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
+				  sizeof(value), 0, 0);
+		if (err)
+			goto out;
+	}
+
+out:
+	/* In case of error should we delete all WSL xattr? */
+	return err;
+}
+
+/*
+ * ntfs_get_wsl_perm
+ *
+ * get uid/gid/mode from xattr
+ * it is called from ntfs_iget5->ntfs_read_mft
+ */
+void ntfs_get_wsl_perm(struct inode *inode)
+{
+	size_t sz;
+	__le32 value[3];
+
+	if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
+			sizeof(value[0]), &sz) == sizeof(value[0]) &&
+	    ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
+			sizeof(value[1]), &sz) == sizeof(value[1]) &&
+	    ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
+			sizeof(value[2]), &sz) == sizeof(value[2])) {
+		i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
+		i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
+		inode->i_mode = le32_to_cpu(value[2]);
+
+		if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
+				&value[0], sizeof(value),
+				&sz) == sizeof(value[0])) {
+			inode->i_rdev = le32_to_cpu(value[0]);
+		}
+	}
+}
+
+static bool ntfs_xattr_user_list(struct dentry *dentry)
+{
+	return true;
+}
+
+// clang-format off
+static const struct xattr_handler ntfs_xattr_handler = {
+	.prefix	= "",
+	.get	= ntfs_getxattr,
+	.set	= ntfs_setxattr,
+	.list	= ntfs_xattr_user_list,
+};
+
+const struct xattr_handler *ntfs_xattr_handlers[] = {
+	&ntfs_xattr_handler,
+	NULL,
+};
+// clang-format on