From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Wed, 1 Sep 2021 23:39:53 +0000 (+1000)
Subject: Merge remote-tracking branch 'overlayfs/overlayfs-next'
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=b57f42b205bb4c6b66a9ea0fba5c01a418abb18a;p=users%2Fjedix%2Flinux-maple.git

Merge remote-tracking branch 'overlayfs/overlayfs-next'
---

b57f42b205bb4c6b66a9ea0fba5c01a418abb18a
diff --cc fs/ntfs3/ntfs_fs.h
index 97e682ebcfb9,000000000000..dc71c59fd445
mode 100644,000000..100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@@ -1,1111 -1,0 +1,1111 @@@
 +/* SPDX-License-Identifier: GPL-2.0 */
 +/*
 + *
 + * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
 + *
 + */
 +
 +// clang-format off
 +#ifndef _LINUX_NTFS3_NTFS_FS_H
 +#define _LINUX_NTFS3_NTFS_FS_H
 +
 +#define MINUS_ONE_T			((size_t)(-1))
 +/* Biggest MFT / smallest cluster */
 +#define MAXIMUM_BYTES_PER_MFT		4096
 +#define NTFS_BLOCKS_PER_MFT_RECORD	(MAXIMUM_BYTES_PER_MFT / 512)
 +
 +#define MAXIMUM_BYTES_PER_INDEX		4096
 +#define NTFS_BLOCKS_PER_INODE		(MAXIMUM_BYTES_PER_INDEX / 512)
 +
 +/* NTFS specific error code when fixup failed. */
 +#define E_NTFS_FIXUP			555
 +/* NTFS specific error code about resident->nonresident. */
 +#define E_NTFS_NONRESIDENT		556
 +/* NTFS specific error code about punch hole. */
 +#define E_NTFS_NOTALIGNED		557
 +
 +
 +/* sbi->flags */
 +#define NTFS_FLAGS_NODISCARD		0x00000001
 +/* Set when LogFile is replaying. */
 +#define NTFS_FLAGS_LOG_REPLAYING	0x00000008
 +/* Set when we changed first MFT's which copy must be updated in $MftMirr. */
 +#define NTFS_FLAGS_MFTMIRR		0x00001000
 +#define NTFS_FLAGS_NEED_REPLAY		0x04000000
 +
 +
 +/* ni->ni_flags */
 +/*
 + * Data attribute is external compressed (LZX/Xpress)
 + * 1 - WOF_COMPRESSION_XPRESS4K
 + * 2 - WOF_COMPRESSION_XPRESS8K
 + * 3 - WOF_COMPRESSION_XPRESS16K
 + * 4 - WOF_COMPRESSION_LZX32K
 + */
 +#define NI_FLAG_COMPRESSED_MASK		0x0000000f
 +/* Data attribute is deduplicated. */
 +#define NI_FLAG_DEDUPLICATED		0x00000010
 +#define NI_FLAG_EA			0x00000020
 +#define NI_FLAG_DIR			0x00000040
 +#define NI_FLAG_RESIDENT		0x00000080
 +#define NI_FLAG_UPDATE_PARENT		0x00000100
 +// clang-format on
 +
 +struct ntfs_mount_options {
 +	struct nls_table *nls;
 +
 +	kuid_t fs_uid;
 +	kgid_t fs_gid;
 +	u16 fs_fmask_inv;
 +	u16 fs_dmask_inv;
 +
 +	unsigned uid : 1, /* uid was set. */
 +		gid : 1, /* gid was set. */
 +		fmask : 1, /* fmask was set. */
 +		dmask : 1, /* dmask was set. */
 +		sys_immutable : 1, /* Immutable system files. */
 +		discard : 1, /* Issue discard requests on deletions. */
 +		sparse : 1, /* Create sparse files. */
 +		showmeta : 1, /* Show meta files. */
 +		nohidden : 1, /* Do not show hidden files. */
 +		force : 1, /* Rw mount dirty volume. */
 +		no_acs_rules : 1, /*Exclude acs rules. */
 +		prealloc : 1 /* Preallocate space when file is growing. */
 +		;
 +};
 +
 +/* Special value to unpack and deallocate. */
 +#define RUN_DEALLOCATE ((struct runs_tree *)(size_t)1)
 +
 +/* TODO: Use rb tree instead of array. */
 +struct runs_tree {
 +	struct ntfs_run *runs;
 +	size_t count; /* Currently used size a ntfs_run storage. */
 +	size_t allocated; /* Currently allocated ntfs_run storage size. */
 +};
 +
 +struct ntfs_buffers {
 +	/* Biggest MFT / smallest cluster = 4096 / 512 = 8 */
 +	/* Biggest index / smallest cluster = 4096 / 512 = 8 */
 +	struct buffer_head *bh[PAGE_SIZE >> SECTOR_SHIFT];
 +	u32 bytes;
 +	u32 nbufs;
 +	u32 off;
 +};
 +
 +enum ALLOCATE_OPT {
 +	ALLOCATE_DEF = 0, // Allocate all clusters.
 +	ALLOCATE_MFT = 1, // Allocate for MFT.
 +};
 +
 +enum bitmap_mutex_classes {
 +	BITMAP_MUTEX_CLUSTERS = 0,
 +	BITMAP_MUTEX_MFT = 1,
 +};
 +
 +struct wnd_bitmap {
 +	struct super_block *sb;
 +	struct rw_semaphore rw_lock;
 +
 +	struct runs_tree run;
 +	size_t nbits;
 +
 +	size_t total_zeroes; // Total number of free bits.
 +	u16 *free_bits; // Free bits in each window.
 +	size_t nwnd;
 +	u32 bits_last; // Bits in last window.
 +
 +	struct rb_root start_tree; // Extents, sorted by 'start'.
 +	struct rb_root count_tree; // Extents, sorted by 'count + start'.
 +	size_t count; // Extents count.
 +
 +	/*
 +	 * -1 Tree is activated but not updated (too many fragments).
 +	 * 0 - Tree is not activated.
 +	 * 1 - Tree is activated and updated.
 +	 */
 +	int uptodated;
 +	size_t extent_min; // Minimal extent used while building.
 +	size_t extent_max; // Upper estimate of biggest free block.
 +
 +	/* Zone [bit, end) */
 +	size_t zone_bit;
 +	size_t zone_end;
 +
 +	bool set_tail; // Not necessary in driver.
 +	bool inited;
 +};
 +
 +typedef int (*NTFS_CMP_FUNC)(const void *key1, size_t len1, const void *key2,
 +			     size_t len2, const void *param);
 +
 +enum index_mutex_classed {
 +	INDEX_MUTEX_I30 = 0,
 +	INDEX_MUTEX_SII = 1,
 +	INDEX_MUTEX_SDH = 2,
 +	INDEX_MUTEX_SO = 3,
 +	INDEX_MUTEX_SQ = 4,
 +	INDEX_MUTEX_SR = 5,
 +	INDEX_MUTEX_TOTAL
 +};
 +
 +/* ntfs_index - Allocation unit inside directory. */
 +struct ntfs_index {
 +	struct runs_tree bitmap_run;
 +	struct runs_tree alloc_run;
 +	/* read/write access to 'bitmap_run'/'alloc_run' while ntfs_readdir */
 +	struct rw_semaphore run_lock;
 +
 +	/*TODO: Remove 'cmp'. */
 +	NTFS_CMP_FUNC cmp;
 +
 +	u8 index_bits; // log2(root->index_block_size)
 +	u8 idx2vbn_bits; // log2(root->index_block_clst)
 +	u8 vbn2vbo_bits; // index_block_size < cluster? 9 : cluster_bits
 +	u8 type; // index_mutex_classed
 +};
 +
 +/* Minimum MFT zone. */
 +#define NTFS_MIN_MFT_ZONE 100
 +
 +/* Ntfs file system in-core superblock data. */
 +struct ntfs_sb_info {
 +	struct super_block *sb;
 +
 +	u32 discard_granularity;
 +	u64 discard_granularity_mask_inv; // ~(discard_granularity_mask_inv-1)
 +
 +	u32 cluster_size; // bytes per cluster
 +	u32 cluster_mask; // == cluster_size - 1
 +	u64 cluster_mask_inv; // ~(cluster_size - 1)
 +	u32 block_mask; // sb->s_blocksize - 1
 +	u32 blocks_per_cluster; // cluster_size / sb->s_blocksize
 +
 +	u32 record_size;
 +	u32 sector_size;
 +	u32 index_size;
 +
 +	u8 sector_bits;
 +	u8 cluster_bits;
 +	u8 record_bits;
 +
 +	u64 maxbytes; // Maximum size for normal files.
 +	u64 maxbytes_sparse; // Maximum size for sparse file.
 +
 +	u32 flags; // See NTFS_FLAGS_XXX.
 +
 +	CLST bad_clusters; // The count of marked bad clusters.
 +
 +	u16 max_bytes_per_attr; // Maximum attribute size in record.
 +	u16 attr_size_tr; // Attribute size threshold (320 bytes).
 +
 +	/* Records in $Extend. */
 +	CLST objid_no;
 +	CLST quota_no;
 +	CLST reparse_no;
 +	CLST usn_jrnl_no;
 +
 +	struct ATTR_DEF_ENTRY *def_table; // Attribute definition table.
 +	u32 def_entries;
 +	u32 ea_max_size;
 +
 +	struct MFT_REC *new_rec;
 +
 +	u16 *upcase;
 +
 +	struct {
 +		u64 lbo, lbo2;
 +		struct ntfs_inode *ni;
 +		struct wnd_bitmap bitmap; // $MFT::Bitmap
 +		/*
 +		 * MFT records [11-24) used to expand MFT itself.
 +		 * They always marked as used in $MFT::Bitmap
 +		 * 'reserved_bitmap' contains real bitmap of these records.
 +		 */
 +		ulong reserved_bitmap; // Bitmap of used records [11 - 24)
 +		size_t next_free; // The next record to allocate from
 +		size_t used; // MFT valid size in records.
 +		u32 recs_mirr; // Number of records in MFTMirr
 +		u8 next_reserved;
 +		u8 reserved_bitmap_inited;
 +	} mft;
 +
 +	struct {
 +		struct wnd_bitmap bitmap; // $Bitmap::Data
 +		CLST next_free_lcn;
 +	} used;
 +
 +	struct {
 +		u64 size; // In bytes.
 +		u64 blocks; // In blocks.
 +		u64 ser_num;
 +		struct ntfs_inode *ni;
 +		__le16 flags; // Cached current VOLUME_INFO::flags, VOLUME_FLAG_DIRTY.
 +		u8 major_ver;
 +		u8 minor_ver;
 +		char label[65];
 +		bool real_dirty; // Real fs state.
 +	} volume;
 +
 +	struct {
 +		struct ntfs_index index_sii;
 +		struct ntfs_index index_sdh;
 +		struct ntfs_inode *ni;
 +		u32 next_id;
 +		u64 next_off;
 +
 +		__le32 def_security_id;
 +	} security;
 +
 +	struct {
 +		struct ntfs_index index_r;
 +		struct ntfs_inode *ni;
 +		u64 max_size; // 16K
 +	} reparse;
 +
 +	struct {
 +		struct ntfs_index index_o;
 +		struct ntfs_inode *ni;
 +	} objid;
 +
 +	struct {
 +		struct mutex mtx_lznt;
 +		struct lznt *lznt;
 +#ifdef CONFIG_NTFS3_LZX_XPRESS
 +		struct mutex mtx_xpress;
 +		struct xpress_decompressor *xpress;
 +		struct mutex mtx_lzx;
 +		struct lzx_decompressor *lzx;
 +#endif
 +	} compress;
 +
 +	struct ntfs_mount_options options;
 +	struct ratelimit_state msg_ratelimit;
 +};
 +
 +/* One MFT record(usually 1024 bytes), consists of attributes. */
 +struct mft_inode {
 +	struct rb_node node;
 +	struct ntfs_sb_info *sbi;
 +
 +	struct MFT_REC *mrec;
 +	struct ntfs_buffers nb;
 +
 +	CLST rno;
 +	bool dirty;
 +};
 +
 +/* Nested class for ntfs_inode::ni_lock. */
 +enum ntfs_inode_mutex_lock_class {
 +	NTFS_INODE_MUTEX_DIRTY,
 +	NTFS_INODE_MUTEX_SECURITY,
 +	NTFS_INODE_MUTEX_OBJID,
 +	NTFS_INODE_MUTEX_REPARSE,
 +	NTFS_INODE_MUTEX_NORMAL,
 +	NTFS_INODE_MUTEX_PARENT,
 +};
 +
 +/*
 + * sturct ntfs_inode
 + *
 + * Ntfs inode - extends linux inode. consists of one or more MFT inodes.
 + */
 +struct ntfs_inode {
 +	struct mft_inode mi; // base record
 +
 +	/*
 +	 * Valid size: [0 - i_valid) - these range in file contains valid data.
 +	 * Range [i_valid - inode->i_size) - contains 0.
 +	 * Usually i_valid <= inode->i_size.
 +	 */
 +	u64 i_valid;
 +	struct timespec64 i_crtime;
 +
 +	struct mutex ni_lock;
 +
 +	/* File attributes from std. */
 +	enum FILE_ATTRIBUTE std_fa;
 +	__le32 std_security_id;
 +
 +	/*
 +	 * Tree of mft_inode.
 +	 * Not empty when primary MFT record (usually 1024 bytes) can't save all attributes
 +	 * e.g. file becomes too fragmented or contains a lot of names.
 +	 */
 +	struct rb_root mi_tree;
 +
 +	/*
 +	 * This member is used in ntfs_readdir to ensure that all subrecords are loaded
 +	 */
 +	u8 mi_loaded;
 +
 +	union {
 +		struct ntfs_index dir;
 +		struct {
 +			struct rw_semaphore run_lock;
 +			struct runs_tree run;
 +#ifdef CONFIG_NTFS3_LZX_XPRESS
 +			struct page *offs_page;
 +#endif
 +		} file;
 +	};
 +
 +	struct {
 +		struct runs_tree run;
 +		struct ATTR_LIST_ENTRY *le; // 1K aligned memory.
 +		size_t size;
 +		bool dirty;
 +	} attr_list;
 +
 +	size_t ni_flags; // NI_FLAG_XXX
 +
 +	struct inode vfs_inode;
 +};
 +
 +struct indx_node {
 +	struct ntfs_buffers nb;
 +	struct INDEX_BUFFER *index;
 +};
 +
 +struct ntfs_fnd {
 +	int level;
 +	struct indx_node *nodes[20];
 +	struct NTFS_DE *de[20];
 +	struct NTFS_DE *root_de;
 +};
 +
 +enum REPARSE_SIGN {
 +	REPARSE_NONE = 0,
 +	REPARSE_COMPRESSED = 1,
 +	REPARSE_DEDUPLICATED = 2,
 +	REPARSE_LINK = 3
 +};
 +
 +/* Functions from attrib.c */
 +int attr_load_runs(struct ATTRIB *attr, struct ntfs_inode *ni,
 +		   struct runs_tree *run, const CLST *vcn);
 +int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run,
 +			   CLST vcn, CLST lcn, CLST len, CLST *pre_alloc,
 +			   enum ALLOCATE_OPT opt, CLST *alen, const size_t fr,
 +			   CLST *new_lcn);
 +int attr_make_nonresident(struct ntfs_inode *ni, struct ATTRIB *attr,
 +			  struct ATTR_LIST_ENTRY *le, struct mft_inode *mi,
 +			  u64 new_size, struct runs_tree *run,
 +			  struct ATTRIB **ins_attr, struct page *page);
 +int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
 +		  const __le16 *name, u8 name_len, struct runs_tree *run,
 +		  u64 new_size, const u64 *new_valid, bool keep_prealloc,
 +		  struct ATTRIB **ret);
 +int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
 +			CLST *len, bool *new);
 +int attr_data_read_resident(struct ntfs_inode *ni, struct page *page);
 +int attr_data_write_resident(struct ntfs_inode *ni, struct page *page);
 +int attr_load_runs_vcn(struct ntfs_inode *ni, enum ATTR_TYPE type,
 +		       const __le16 *name, u8 name_len, struct runs_tree *run,
 +		       CLST vcn);
 +int attr_load_runs_range(struct ntfs_inode *ni, enum ATTR_TYPE type,
 +			 const __le16 *name, u8 name_len, struct runs_tree *run,
 +			 u64 from, u64 to);
 +int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr,
 +			struct runs_tree *run, u64 frame, u64 frames,
 +			u8 frame_bits, u32 *ondisk_size, u64 *vbo_data);
 +int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
 +			     CLST frame, CLST *clst_data);
 +int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 +			u64 new_valid);
 +int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes);
 +int attr_punch_hole(struct ntfs_inode *ni, u64 vbo, u64 bytes, u32 *frame_size);
 +
 +/* Functions from attrlist.c */
 +void al_destroy(struct ntfs_inode *ni);
 +bool al_verify(struct ntfs_inode *ni);
 +int ntfs_load_attr_list(struct ntfs_inode *ni, struct ATTRIB *attr);
 +struct ATTR_LIST_ENTRY *al_enumerate(struct ntfs_inode *ni,
 +				     struct ATTR_LIST_ENTRY *le);
 +struct ATTR_LIST_ENTRY *al_find_le(struct ntfs_inode *ni,
 +				   struct ATTR_LIST_ENTRY *le,
 +				   const struct ATTRIB *attr);
 +struct ATTR_LIST_ENTRY *al_find_ex(struct ntfs_inode *ni,
 +				   struct ATTR_LIST_ENTRY *le,
 +				   enum ATTR_TYPE type, const __le16 *name,
 +				   u8 name_len, const CLST *vcn);
 +int al_add_le(struct ntfs_inode *ni, enum ATTR_TYPE type, const __le16 *name,
 +	      u8 name_len, CLST svcn, __le16 id, const struct MFT_REF *ref,
 +	      struct ATTR_LIST_ENTRY **new_le);
 +bool al_remove_le(struct ntfs_inode *ni, struct ATTR_LIST_ENTRY *le);
 +bool al_delete_le(struct ntfs_inode *ni, enum ATTR_TYPE type, CLST vcn,
 +		  const __le16 *name, size_t name_len,
 +		  const struct MFT_REF *ref);
 +int al_update(struct ntfs_inode *ni);
 +static inline size_t al_aligned(size_t size)
 +{
 +	return (size + 1023) & ~(size_t)1023;
 +}
 +
 +/* Globals from bitfunc.c */
 +bool are_bits_clear(const ulong *map, size_t bit, size_t nbits);
 +bool are_bits_set(const ulong *map, size_t bit, size_t nbits);
 +size_t get_set_bits_ex(const ulong *map, size_t bit, size_t nbits);
 +
 +/* Globals from dir.c */
 +int ntfs_utf16_to_nls(struct ntfs_sb_info *sbi, const struct le_str *uni,
 +		      u8 *buf, int buf_len);
 +int ntfs_nls_to_utf16(struct ntfs_sb_info *sbi, const u8 *name, u32 name_len,
 +		      struct cpu_str *uni, u32 max_ulen,
 +		      enum utf16_endian endian);
 +struct inode *dir_search_u(struct inode *dir, const struct cpu_str *uni,
 +			   struct ntfs_fnd *fnd);
 +bool dir_is_empty(struct inode *dir);
 +extern const struct file_operations ntfs_dir_operations;
 +
 +/* Globals from file.c */
 +int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 +		 struct kstat *stat, u32 request_mask, u32 flags);
 +void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
 +			 CLST len);
 +int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 +		  struct iattr *attr);
 +int ntfs_file_open(struct inode *inode, struct file *file);
 +int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 +		__u64 start, __u64 len);
 +extern const struct inode_operations ntfs_special_inode_operations;
 +extern const struct inode_operations ntfs_file_inode_operations;
 +extern const struct file_operations ntfs_file_operations;
 +
 +/* Globals from frecord.c */
 +void ni_remove_mi(struct ntfs_inode *ni, struct mft_inode *mi);
 +struct ATTR_STD_INFO *ni_std(struct ntfs_inode *ni);
 +struct ATTR_STD_INFO5 *ni_std5(struct ntfs_inode *ni);
 +void ni_clear(struct ntfs_inode *ni);
 +int ni_load_mi_ex(struct ntfs_inode *ni, CLST rno, struct mft_inode **mi);
 +int ni_load_mi(struct ntfs_inode *ni, const struct ATTR_LIST_ENTRY *le,
 +	       struct mft_inode **mi);
 +struct ATTRIB *ni_find_attr(struct ntfs_inode *ni, struct ATTRIB *attr,
 +			    struct ATTR_LIST_ENTRY **entry_o,
 +			    enum ATTR_TYPE type, const __le16 *name,
 +			    u8 name_len, const CLST *vcn,
 +			    struct mft_inode **mi);
 +struct ATTRIB *ni_enum_attr_ex(struct ntfs_inode *ni, struct ATTRIB *attr,
 +			       struct ATTR_LIST_ENTRY **le,
 +			       struct mft_inode **mi);
 +struct ATTRIB *ni_load_attr(struct ntfs_inode *ni, enum ATTR_TYPE type,
 +			    const __le16 *name, u8 name_len, CLST vcn,
 +			    struct mft_inode **pmi);
 +int ni_load_all_mi(struct ntfs_inode *ni);
 +bool ni_add_subrecord(struct ntfs_inode *ni, CLST rno, struct mft_inode **mi);
 +int ni_remove_attr(struct ntfs_inode *ni, enum ATTR_TYPE type,
 +		   const __le16 *name, size_t name_len, bool base_only,
 +		   const __le16 *id);
 +int ni_create_attr_list(struct ntfs_inode *ni);
 +int ni_expand_list(struct ntfs_inode *ni);
 +int ni_insert_nonresident(struct ntfs_inode *ni, enum ATTR_TYPE type,
 +			  const __le16 *name, u8 name_len,
 +			  const struct runs_tree *run, CLST svcn, CLST len,
 +			  __le16 flags, struct ATTRIB **new_attr,
 +			  struct mft_inode **mi);
 +int ni_insert_resident(struct ntfs_inode *ni, u32 data_size,
 +		       enum ATTR_TYPE type, const __le16 *name, u8 name_len,
 +		       struct ATTRIB **new_attr, struct mft_inode **mi,
 +		       struct ATTR_LIST_ENTRY **le);
 +void ni_remove_attr_le(struct ntfs_inode *ni, struct ATTRIB *attr,
 +		       struct mft_inode *mi, struct ATTR_LIST_ENTRY *le);
 +int ni_delete_all(struct ntfs_inode *ni);
 +struct ATTR_FILE_NAME *ni_fname_name(struct ntfs_inode *ni,
 +				     const struct cpu_str *uni,
 +				     const struct MFT_REF *home,
 +				     struct mft_inode **mi,
 +				     struct ATTR_LIST_ENTRY **entry);
 +struct ATTR_FILE_NAME *ni_fname_type(struct ntfs_inode *ni, u8 name_type,
 +				     struct mft_inode **mi,
 +				     struct ATTR_LIST_ENTRY **entry);
 +int ni_new_attr_flags(struct ntfs_inode *ni, enum FILE_ATTRIBUTE new_fa);
 +enum REPARSE_SIGN ni_parse_reparse(struct ntfs_inode *ni, struct ATTRIB *attr,
 +				   void *buffer);
 +int ni_write_inode(struct inode *inode, int sync, const char *hint);
 +#define _ni_write_inode(i, w) ni_write_inode(i, w, __func__)
 +int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
 +	      __u64 vbo, __u64 len);
 +int ni_readpage_cmpr(struct ntfs_inode *ni, struct page *page);
 +int ni_decompress_file(struct ntfs_inode *ni);
 +int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages,
 +		  u32 pages_per_frame);
 +int ni_write_frame(struct ntfs_inode *ni, struct page **pages,
 +		   u32 pages_per_frame);
 +int ni_remove_name(struct ntfs_inode *dir_ni, struct ntfs_inode *ni,
 +		   struct NTFS_DE *de, struct NTFS_DE **de2, int *undo_step);
 +
 +bool ni_remove_name_undo(struct ntfs_inode *dir_ni, struct ntfs_inode *ni,
 +			 struct NTFS_DE *de, struct NTFS_DE *de2,
 +			 int undo_step);
 +
 +int ni_add_name(struct ntfs_inode *dir_ni, struct ntfs_inode *ni,
 +		struct NTFS_DE *de);
 +
 +int ni_rename(struct ntfs_inode *dir_ni, struct ntfs_inode *new_dir_ni,
 +	      struct ntfs_inode *ni, struct NTFS_DE *de, struct NTFS_DE *new_de,
 +	      bool *is_bad);
 +
 +bool ni_is_dirty(struct inode *inode);
 +
 +/* Globals from fslog.c */
 +int log_replay(struct ntfs_inode *ni, bool *initialized);
 +
 +/* Globals from fsntfs.c */
 +bool ntfs_fix_pre_write(struct NTFS_RECORD_HEADER *rhdr, size_t bytes);
 +int ntfs_fix_post_read(struct NTFS_RECORD_HEADER *rhdr, size_t bytes,
 +		       bool simple);
 +int ntfs_extend_init(struct ntfs_sb_info *sbi);
 +int ntfs_loadlog_and_replay(struct ntfs_inode *ni, struct ntfs_sb_info *sbi);
 +const struct ATTR_DEF_ENTRY *ntfs_query_def(struct ntfs_sb_info *sbi,
 +					    enum ATTR_TYPE Type);
 +int ntfs_look_for_free_space(struct ntfs_sb_info *sbi, CLST lcn, CLST len,
 +			     CLST *new_lcn, CLST *new_len,
 +			     enum ALLOCATE_OPT opt);
 +int ntfs_look_free_mft(struct ntfs_sb_info *sbi, CLST *rno, bool mft,
 +		       struct ntfs_inode *ni, struct mft_inode **mi);
 +void ntfs_mark_rec_free(struct ntfs_sb_info *sbi, CLST rno);
 +int ntfs_clear_mft_tail(struct ntfs_sb_info *sbi, size_t from, size_t to);
 +int ntfs_refresh_zone(struct ntfs_sb_info *sbi);
 +int ntfs_update_mftmirr(struct ntfs_sb_info *sbi, int wait);
 +enum NTFS_DIRTY_FLAGS {
 +	NTFS_DIRTY_CLEAR = 0,
 +	NTFS_DIRTY_DIRTY = 1,
 +	NTFS_DIRTY_ERROR = 2,
 +};
 +int ntfs_set_state(struct ntfs_sb_info *sbi, enum NTFS_DIRTY_FLAGS dirty);
 +int ntfs_sb_read(struct super_block *sb, u64 lbo, size_t bytes, void *buffer);
 +int ntfs_sb_write(struct super_block *sb, u64 lbo, size_t bytes,
 +		  const void *buffer, int wait);
 +int ntfs_sb_write_run(struct ntfs_sb_info *sbi, const struct runs_tree *run,
 +		      u64 vbo, const void *buf, size_t bytes);
 +struct buffer_head *ntfs_bread_run(struct ntfs_sb_info *sbi,
 +				   const struct runs_tree *run, u64 vbo);
 +int ntfs_read_run_nb(struct ntfs_sb_info *sbi, const struct runs_tree *run,
 +		     u64 vbo, void *buf, u32 bytes, struct ntfs_buffers *nb);
 +int ntfs_read_bh(struct ntfs_sb_info *sbi, const struct runs_tree *run, u64 vbo,
 +		 struct NTFS_RECORD_HEADER *rhdr, u32 bytes,
 +		 struct ntfs_buffers *nb);
 +int ntfs_get_bh(struct ntfs_sb_info *sbi, const struct runs_tree *run, u64 vbo,
 +		u32 bytes, struct ntfs_buffers *nb);
 +int ntfs_write_bh(struct ntfs_sb_info *sbi, struct NTFS_RECORD_HEADER *rhdr,
 +		  struct ntfs_buffers *nb, int sync);
 +int ntfs_bio_pages(struct ntfs_sb_info *sbi, const struct runs_tree *run,
 +		   struct page **pages, u32 nr_pages, u64 vbo, u32 bytes,
 +		   u32 op);
 +int ntfs_bio_fill_1(struct ntfs_sb_info *sbi, const struct runs_tree *run);
 +int ntfs_vbo_to_lbo(struct ntfs_sb_info *sbi, const struct runs_tree *run,
 +		    u64 vbo, u64 *lbo, u64 *bytes);
 +struct ntfs_inode *ntfs_new_inode(struct ntfs_sb_info *sbi, CLST nRec,
 +				  bool dir);
 +extern const u8 s_default_security[0x50];
 +bool is_sd_valid(const struct SECURITY_DESCRIPTOR_RELATIVE *sd, u32 len);
 +int ntfs_security_init(struct ntfs_sb_info *sbi);
 +int ntfs_get_security_by_id(struct ntfs_sb_info *sbi, __le32 security_id,
 +			    struct SECURITY_DESCRIPTOR_RELATIVE **sd,
 +			    size_t *size);
 +int ntfs_insert_security(struct ntfs_sb_info *sbi,
 +			 const struct SECURITY_DESCRIPTOR_RELATIVE *sd,
 +			 u32 size, __le32 *security_id, bool *inserted);
 +int ntfs_reparse_init(struct ntfs_sb_info *sbi);
 +int ntfs_objid_init(struct ntfs_sb_info *sbi);
 +int ntfs_objid_remove(struct ntfs_sb_info *sbi, struct GUID *guid);
 +int ntfs_insert_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
 +			const struct MFT_REF *ref);
 +int ntfs_remove_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
 +			const struct MFT_REF *ref);
 +void mark_as_free_ex(struct ntfs_sb_info *sbi, CLST lcn, CLST len, bool trim);
 +int run_deallocate(struct ntfs_sb_info *sbi, struct runs_tree *run, bool trim);
 +
 +/* Globals from index.c */
 +int indx_used_bit(struct ntfs_index *indx, struct ntfs_inode *ni, size_t *bit);
 +void fnd_clear(struct ntfs_fnd *fnd);
 +static inline struct ntfs_fnd *fnd_get(void)
 +{
 +	return kzalloc(sizeof(struct ntfs_fnd), GFP_NOFS);
 +}
 +static inline void fnd_put(struct ntfs_fnd *fnd)
 +{
 +	if (fnd) {
 +		fnd_clear(fnd);
 +		kfree(fnd);
 +	}
 +}
 +void indx_clear(struct ntfs_index *idx);
 +int indx_init(struct ntfs_index *indx, struct ntfs_sb_info *sbi,
 +	      const struct ATTRIB *attr, enum index_mutex_classed type);
 +struct INDEX_ROOT *indx_get_root(struct ntfs_index *indx, struct ntfs_inode *ni,
 +				 struct ATTRIB **attr, struct mft_inode **mi);
 +int indx_read(struct ntfs_index *idx, struct ntfs_inode *ni, CLST vbn,
 +	      struct indx_node **node);
 +int indx_find(struct ntfs_index *indx, struct ntfs_inode *dir,
 +	      const struct INDEX_ROOT *root, const void *Key, size_t KeyLen,
 +	      const void *param, int *diff, struct NTFS_DE **entry,
 +	      struct ntfs_fnd *fnd);
 +int indx_find_sort(struct ntfs_index *indx, struct ntfs_inode *ni,
 +		   const struct INDEX_ROOT *root, struct NTFS_DE **entry,
 +		   struct ntfs_fnd *fnd);
 +int indx_find_raw(struct ntfs_index *indx, struct ntfs_inode *ni,
 +		  const struct INDEX_ROOT *root, struct NTFS_DE **entry,
 +		  size_t *off, struct ntfs_fnd *fnd);
 +int indx_insert_entry(struct ntfs_index *indx, struct ntfs_inode *ni,
 +		      const struct NTFS_DE *new_de, const void *param,
 +		      struct ntfs_fnd *fnd, bool undo);
 +int indx_delete_entry(struct ntfs_index *indx, struct ntfs_inode *ni,
 +		      const void *key, u32 key_len, const void *param);
 +int indx_update_dup(struct ntfs_inode *ni, struct ntfs_sb_info *sbi,
 +		    const struct ATTR_FILE_NAME *fname,
 +		    const struct NTFS_DUP_INFO *dup, int sync);
 +
 +/* Globals from inode.c */
 +struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 +			 const struct cpu_str *name);
 +int ntfs_set_size(struct inode *inode, u64 new_size);
 +int reset_log_file(struct inode *inode);
 +int ntfs_get_block(struct inode *inode, sector_t vbn,
 +		   struct buffer_head *bh_result, int create);
 +int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc);
 +int ntfs_sync_inode(struct inode *inode);
 +int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
 +		      struct inode *i2);
 +int inode_write_data(struct inode *inode, const void *data, size_t bytes);
 +struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
 +				struct inode *dir, struct dentry *dentry,
 +				const struct cpu_str *uni, umode_t mode,
 +				dev_t dev, const char *symname, u32 size,
 +				struct ntfs_fnd *fnd);
 +int ntfs_link_inode(struct inode *inode, struct dentry *dentry);
 +int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry);
 +void ntfs_evict_inode(struct inode *inode);
 +extern const struct inode_operations ntfs_link_inode_operations;
 +extern const struct address_space_operations ntfs_aops;
 +extern const struct address_space_operations ntfs_aops_cmpr;
 +
 +/* Globals from name_i.c */
 +int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
 +		 const struct cpu_str *uni);
 +struct dentry *ntfs3_get_parent(struct dentry *child);
 +
 +extern const struct inode_operations ntfs_dir_inode_operations;
 +extern const struct inode_operations ntfs_special_inode_operations;
 +
 +/* Globals from record.c */
 +int mi_get(struct ntfs_sb_info *sbi, CLST rno, struct mft_inode **mi);
 +void mi_put(struct mft_inode *mi);
 +int mi_init(struct mft_inode *mi, struct ntfs_sb_info *sbi, CLST rno);
 +int mi_read(struct mft_inode *mi, bool is_mft);
 +struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr);
 +// TODO: id?
 +struct ATTRIB *mi_find_attr(struct mft_inode *mi, struct ATTRIB *attr,
 +			    enum ATTR_TYPE type, const __le16 *name,
 +			    size_t name_len, const __le16 *id);
 +static inline struct ATTRIB *rec_find_attr_le(struct mft_inode *rec,
 +					      struct ATTR_LIST_ENTRY *le)
 +{
 +	return mi_find_attr(rec, NULL, le->type, le_name(le), le->name_len,
 +			    &le->id);
 +}
 +int mi_write(struct mft_inode *mi, int wait);
 +int mi_format_new(struct mft_inode *mi, struct ntfs_sb_info *sbi, CLST rno,
 +		  __le16 flags, bool is_mft);
 +void mi_mark_free(struct mft_inode *mi);
 +struct ATTRIB *mi_insert_attr(struct mft_inode *mi, enum ATTR_TYPE type,
 +			      const __le16 *name, u8 name_len, u32 asize,
 +			      u16 name_off);
 +
 +bool mi_remove_attr(struct ntfs_inode *ni, struct mft_inode *mi,
 +		    struct ATTRIB *attr);
 +bool mi_resize_attr(struct mft_inode *mi, struct ATTRIB *attr, int bytes);
 +int mi_pack_runs(struct mft_inode *mi, struct ATTRIB *attr,
 +		 struct runs_tree *run, CLST len);
 +static inline bool mi_is_ref(const struct mft_inode *mi,
 +			     const struct MFT_REF *ref)
 +{
 +	if (le32_to_cpu(ref->low) != mi->rno)
 +		return false;
 +	if (ref->seq != mi->mrec->seq)
 +		return false;
 +
 +#ifdef CONFIG_NTFS3_64BIT_CLUSTER
 +	return le16_to_cpu(ref->high) == (mi->rno >> 32);
 +#else
 +	return !ref->high;
 +#endif
 +}
 +
 +static inline void mi_get_ref(const struct mft_inode *mi, struct MFT_REF *ref)
 +{
 +	ref->low = cpu_to_le32(mi->rno);
 +#ifdef CONFIG_NTFS3_64BIT_CLUSTER
 +	ref->high = cpu_to_le16(mi->rno >> 32);
 +#else
 +	ref->high = 0;
 +#endif
 +	ref->seq = mi->mrec->seq;
 +}
 +
 +/* Globals from run.c */
 +bool run_lookup_entry(const struct runs_tree *run, CLST vcn, CLST *lcn,
 +		      CLST *len, size_t *index);
 +void run_truncate(struct runs_tree *run, CLST vcn);
 +void run_truncate_head(struct runs_tree *run, CLST vcn);
 +void run_truncate_around(struct runs_tree *run, CLST vcn);
 +bool run_lookup(const struct runs_tree *run, CLST vcn, size_t *Index);
 +bool run_add_entry(struct runs_tree *run, CLST vcn, CLST lcn, CLST len,
 +		   bool is_mft);
 +bool run_collapse_range(struct runs_tree *run, CLST vcn, CLST len);
 +bool run_get_entry(const struct runs_tree *run, size_t index, CLST *vcn,
 +		   CLST *lcn, CLST *len);
 +bool run_is_mapped_full(const struct runs_tree *run, CLST svcn, CLST evcn);
 +
 +int run_pack(const struct runs_tree *run, CLST svcn, CLST len, u8 *run_buf,
 +	     u32 run_buf_size, CLST *packed_vcns);
 +int run_unpack(struct runs_tree *run, struct ntfs_sb_info *sbi, CLST ino,
 +	       CLST svcn, CLST evcn, CLST vcn, const u8 *run_buf,
 +	       u32 run_buf_size);
 +
 +#ifdef NTFS3_CHECK_FREE_CLST
 +int run_unpack_ex(struct runs_tree *run, struct ntfs_sb_info *sbi, CLST ino,
 +		  CLST svcn, CLST evcn, CLST vcn, const u8 *run_buf,
 +		  u32 run_buf_size);
 +#else
 +#define run_unpack_ex run_unpack
 +#endif
 +int run_get_highest_vcn(CLST vcn, const u8 *run_buf, u64 *highest_vcn);
 +
 +/* Globals from super.c */
 +void *ntfs_set_shared(void *ptr, u32 bytes);
 +void *ntfs_put_shared(void *ptr);
 +void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len);
 +int ntfs_discard(struct ntfs_sb_info *sbi, CLST Lcn, CLST Len);
 +
 +/* Globals from bitmap.c*/
 +int __init ntfs3_init_bitmap(void);
 +void ntfs3_exit_bitmap(void);
 +void wnd_close(struct wnd_bitmap *wnd);
 +static inline size_t wnd_zeroes(const struct wnd_bitmap *wnd)
 +{
 +	return wnd->total_zeroes;
 +}
 +int wnd_init(struct wnd_bitmap *wnd, struct super_block *sb, size_t nbits);
 +int wnd_set_free(struct wnd_bitmap *wnd, size_t bit, size_t bits);
 +int wnd_set_used(struct wnd_bitmap *wnd, size_t bit, size_t bits);
 +bool wnd_is_free(struct wnd_bitmap *wnd, size_t bit, size_t bits);
 +bool wnd_is_used(struct wnd_bitmap *wnd, size_t bit, size_t bits);
 +
 +/* Possible values for 'flags' 'wnd_find'. */
 +#define BITMAP_FIND_MARK_AS_USED 0x01
 +#define BITMAP_FIND_FULL 0x02
 +size_t wnd_find(struct wnd_bitmap *wnd, size_t to_alloc, size_t hint,
 +		size_t flags, size_t *allocated);
 +int wnd_extend(struct wnd_bitmap *wnd, size_t new_bits);
 +void wnd_zone_set(struct wnd_bitmap *wnd, size_t Lcn, size_t Len);
 +int ntfs_trim_fs(struct ntfs_sb_info *sbi, struct fstrim_range *range);
 +
 +/* Globals from upcase.c */
 +int ntfs_cmp_names(const __le16 *s1, size_t l1, const __le16 *s2, size_t l2,
 +		   const u16 *upcase, bool bothcase);
 +int ntfs_cmp_names_cpu(const struct cpu_str *uni1, const struct le_str *uni2,
 +		       const u16 *upcase, bool bothcase);
 +
 +/* globals from xattr.c */
 +#ifdef CONFIG_NTFS3_FS_POSIX_ACL
- struct posix_acl *ntfs_get_acl(struct inode *inode, int type);
++struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu);
 +int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
 +		 struct posix_acl *acl, int type);
 +int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
 +		  struct inode *dir);
 +#else
 +#define ntfs_get_acl NULL
 +#define ntfs_set_acl NULL
 +#endif
 +
 +int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode);
 +int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
 +		    int mask);
 +ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 +extern const struct xattr_handler *ntfs_xattr_handlers[];
 +
 +int ntfs_save_wsl_perm(struct inode *inode);
 +void ntfs_get_wsl_perm(struct inode *inode);
 +
 +/* globals from lznt.c */
 +struct lznt *get_lznt_ctx(int level);
 +size_t compress_lznt(const void *uncompressed, size_t uncompressed_size,
 +		     void *compressed, size_t compressed_size,
 +		     struct lznt *ctx);
 +ssize_t decompress_lznt(const void *compressed, size_t compressed_size,
 +			void *uncompressed, size_t uncompressed_size);
 +
 +static inline bool is_ntfs3(struct ntfs_sb_info *sbi)
 +{
 +	return sbi->volume.major_ver >= 3;
 +}
 +
 +/* (sb->s_flags & SB_ACTIVE) */
 +static inline bool is_mounted(struct ntfs_sb_info *sbi)
 +{
 +	return !!sbi->sb->s_root;
 +}
 +
 +static inline bool ntfs_is_meta_file(struct ntfs_sb_info *sbi, CLST rno)
 +{
 +	return rno < MFT_REC_FREE || rno == sbi->objid_no ||
 +	       rno == sbi->quota_no || rno == sbi->reparse_no ||
 +	       rno == sbi->usn_jrnl_no;
 +}
 +
 +static inline void ntfs_unmap_page(struct page *page)
 +{
 +	kunmap(page);
 +	put_page(page);
 +}
 +
 +static inline struct page *ntfs_map_page(struct address_space *mapping,
 +					 unsigned long index)
 +{
 +	struct page *page = read_mapping_page(mapping, index, NULL);
 +
 +	if (!IS_ERR(page)) {
 +		kmap(page);
 +		if (!PageError(page))
 +			return page;
 +		ntfs_unmap_page(page);
 +		return ERR_PTR(-EIO);
 +	}
 +	return page;
 +}
 +
 +static inline size_t wnd_zone_bit(const struct wnd_bitmap *wnd)
 +{
 +	return wnd->zone_bit;
 +}
 +
 +static inline size_t wnd_zone_len(const struct wnd_bitmap *wnd)
 +{
 +	return wnd->zone_end - wnd->zone_bit;
 +}
 +
 +static inline void run_init(struct runs_tree *run)
 +{
 +	run->runs = NULL;
 +	run->count = 0;
 +	run->allocated = 0;
 +}
 +
 +static inline struct runs_tree *run_alloc(void)
 +{
 +	return kzalloc(sizeof(struct runs_tree), GFP_NOFS);
 +}
 +
 +static inline void run_close(struct runs_tree *run)
 +{
 +	kvfree(run->runs);
 +	memset(run, 0, sizeof(*run));
 +}
 +
 +static inline void run_free(struct runs_tree *run)
 +{
 +	if (run) {
 +		kvfree(run->runs);
 +		kfree(run);
 +	}
 +}
 +
 +static inline bool run_is_empty(struct runs_tree *run)
 +{
 +	return !run->count;
 +}
 +
 +/* NTFS uses quad aligned bitmaps. */
 +static inline size_t bitmap_size(size_t bits)
 +{
 +	return ALIGN((bits + 7) >> 3, 8);
 +}
 +
 +#define _100ns2seconds 10000000
 +#define SecondsToStartOf1970 0x00000002B6109100
 +
 +#define NTFS_TIME_GRAN 100
 +
 +/*
 + * kernel2nt - Converts in-memory kernel timestamp into nt time.
 + */
 +static inline __le64 kernel2nt(const struct timespec64 *ts)
 +{
 +	// 10^7 units of 100 nanoseconds one second
 +	return cpu_to_le64(_100ns2seconds *
 +				   (ts->tv_sec + SecondsToStartOf1970) +
 +			   ts->tv_nsec / NTFS_TIME_GRAN);
 +}
 +
 +/*
 + * nt2kernel - Converts on-disk nt time into kernel timestamp.
 + */
 +static inline void nt2kernel(const __le64 tm, struct timespec64 *ts)
 +{
 +	u64 t = le64_to_cpu(tm) - _100ns2seconds * SecondsToStartOf1970;
 +
 +	// WARNING: do_div changes its first argument(!)
 +	ts->tv_nsec = do_div(t, _100ns2seconds) * 100;
 +	ts->tv_sec = t;
 +}
 +
 +static inline struct ntfs_sb_info *ntfs_sb(struct super_block *sb)
 +{
 +	return sb->s_fs_info;
 +}
 +
 +/*
 + * ntfs_up_cluster - Align up on cluster boundary.
 + */
 +static inline u64 ntfs_up_cluster(const struct ntfs_sb_info *sbi, u64 size)
 +{
 +	return (size + sbi->cluster_mask) & sbi->cluster_mask_inv;
 +}
 +
 +/*
 + * ntfs_up_block - Align up on cluster boundary.
 + */
 +static inline u64 ntfs_up_block(const struct super_block *sb, u64 size)
 +{
 +	return (size + sb->s_blocksize - 1) & ~(u64)(sb->s_blocksize - 1);
 +}
 +
 +static inline CLST bytes_to_cluster(const struct ntfs_sb_info *sbi, u64 size)
 +{
 +	return (size + sbi->cluster_mask) >> sbi->cluster_bits;
 +}
 +
 +static inline u64 bytes_to_block(const struct super_block *sb, u64 size)
 +{
 +	return (size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 +}
 +
 +static inline struct buffer_head *ntfs_bread(struct super_block *sb,
 +					     sector_t block)
 +{
 +	struct buffer_head *bh = sb_bread(sb, block);
 +
 +	if (bh)
 +		return bh;
 +
 +	ntfs_err(sb, "failed to read volume at offset 0x%llx",
 +		 (u64)block << sb->s_blocksize_bits);
 +	return NULL;
 +}
 +
 +static inline struct ntfs_inode *ntfs_i(struct inode *inode)
 +{
 +	return container_of(inode, struct ntfs_inode, vfs_inode);
 +}
 +
 +static inline bool is_compressed(const struct ntfs_inode *ni)
 +{
 +	return (ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) ||
 +	       (ni->ni_flags & NI_FLAG_COMPRESSED_MASK);
 +}
 +
 +static inline int ni_ext_compress_bits(const struct ntfs_inode *ni)
 +{
 +	return 0xb + (ni->ni_flags & NI_FLAG_COMPRESSED_MASK);
 +}
 +
 +/* Bits - 0xc, 0xd, 0xe, 0xf, 0x10 */
 +static inline void ni_set_ext_compress_bits(struct ntfs_inode *ni, u8 bits)
 +{
 +	ni->ni_flags |= (bits - 0xb) & NI_FLAG_COMPRESSED_MASK;
 +}
 +
 +static inline bool is_dedup(const struct ntfs_inode *ni)
 +{
 +	return ni->ni_flags & NI_FLAG_DEDUPLICATED;
 +}
 +
 +static inline bool is_encrypted(const struct ntfs_inode *ni)
 +{
 +	return ni->std_fa & FILE_ATTRIBUTE_ENCRYPTED;
 +}
 +
 +static inline bool is_sparsed(const struct ntfs_inode *ni)
 +{
 +	return ni->std_fa & FILE_ATTRIBUTE_SPARSE_FILE;
 +}
 +
 +static inline int is_resident(struct ntfs_inode *ni)
 +{
 +	return ni->ni_flags & NI_FLAG_RESIDENT;
 +}
 +
 +static inline void le16_sub_cpu(__le16 *var, u16 val)
 +{
 +	*var = cpu_to_le16(le16_to_cpu(*var) - val);
 +}
 +
 +static inline void le32_sub_cpu(__le32 *var, u32 val)
 +{
 +	*var = cpu_to_le32(le32_to_cpu(*var) - val);
 +}
 +
 +static inline void nb_put(struct ntfs_buffers *nb)
 +{
 +	u32 i, nbufs = nb->nbufs;
 +
 +	if (!nbufs)
 +		return;
 +
 +	for (i = 0; i < nbufs; i++)
 +		put_bh(nb->bh[i]);
 +	nb->nbufs = 0;
 +}
 +
 +static inline void put_indx_node(struct indx_node *in)
 +{
 +	if (!in)
 +		return;
 +
 +	kfree(in->index);
 +	nb_put(&in->nb);
 +	kfree(in);
 +}
 +
 +static inline void mi_clear(struct mft_inode *mi)
 +{
 +	nb_put(&mi->nb);
 +	kfree(mi->mrec);
 +	mi->mrec = NULL;
 +}
 +
 +static inline void ni_lock(struct ntfs_inode *ni)
 +{
 +	mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_NORMAL);
 +}
 +
 +static inline void ni_lock_dir(struct ntfs_inode *ni)
 +{
 +	mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_PARENT);
 +}
 +
 +static inline void ni_unlock(struct ntfs_inode *ni)
 +{
 +	mutex_unlock(&ni->ni_lock);
 +}
 +
 +static inline int ni_trylock(struct ntfs_inode *ni)
 +{
 +	return mutex_trylock(&ni->ni_lock);
 +}
 +
 +static inline int attr_load_runs_attr(struct ntfs_inode *ni,
 +				      struct ATTRIB *attr,
 +				      struct runs_tree *run, CLST vcn)
 +{
 +	return attr_load_runs_vcn(ni, attr->type, attr_name(attr),
 +				  attr->name_len, run, vcn);
 +}
 +
 +static inline void le64_sub_cpu(__le64 *var, u64 val)
 +{
 +	*var = cpu_to_le64(le64_to_cpu(*var) - val);
 +}
 +
 +#endif /* _LINUX_NTFS3_NTFS_FS_H */
diff --cc fs/ntfs3/xattr.c
index b15d532e4a17,000000000000..7282d85c4ece
mode 100644,000000..100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@@ -1,1119 -1,0 +1,1122 @@@
 +// 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)
 +			: ALIGN(struct_size(ea, name,
 +					    1 + ea->name_len +
 +						    le16_to_cpu(ea->elength)),
 +				4);
 +}
 +
 +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 - Read 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 = kmalloc(size + add_bytes, GFP_NOFS);
 +	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:
 +	kfree(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.
 + *
 + * Return:
 + * * Number of bytes used / required on
 + * * -ERRNO - on failure
 + */
 +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:
 +	kfree(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:
 +	kfree(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 = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
 +
 +	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 = kzalloc(add, GFP_NOFS);
 +			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,
 +					 NULL);
 +		if (err)
 +			goto out;
 +
 +		err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, 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 */
 +		ni_remove_attr_le(ni, attr, mi, le);
 +	} 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 */
 +		ni_remove_attr_le(ni, attr, mi, le);
 +	} 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);
 +	kfree(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)
++struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu)
 +{
++	if (rcu)
++		return ERR_PTR(-ECHILD);
++
 +	/* 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 = kmalloc(size, GFP_NOFS);
 +		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, 0, locked);
 +	if (!err)
 +		set_cached_acl(inode, type, acl);
 +
 +out:
 +	kfree(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)) {
 +		ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
 +		return -EOPNOTSUPP;
 +	}
 +
- 	acl = ntfs_get_acl(inode, type);
++	acl = ntfs_get_acl(inode, type, false);
 +	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)) {
 +		ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
 +		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;
 +}
 +
 +/*
 + * ntfs_init_acl - 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);
 +		}
 +		kfree(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