alistair23-linux/fs/ntfs/ntfs.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * ntfs.h - Defines for NTFS Linux kernel driver.
 *
 * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
 * Copyright (C) 2002 Richard Russon
 */

#ifndef _LINUX_NTFS_H
#define _LINUX_NTFS_H

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/nls.h>
#include <linux/smp.h>
#include <linux/pagemap.h>

#include "types.h"
#include "volume.h"
#include "layout.h"

typedef enum {
	NTFS_BLOCK_SIZE		= 512,
	NTFS_BLOCK_SIZE_BITS	= 9,
	NTFS_SB_MAGIC		= 0x5346544e,	/* 'NTFS' */
	NTFS_MAX_NAME_LEN	= 255,
	NTFS_MAX_ATTR_NAME_LEN	= 255,
	NTFS_MAX_CLUSTER_SIZE	= 64 * 1024,	/* 64kiB */
	NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_SIZE,
} NTFS_CONSTANTS;

/* Global variables. */

/* Slab caches (from super.c). */
extern struct kmem_cache *ntfs_name_cache;
extern struct kmem_cache *ntfs_inode_cache;
extern struct kmem_cache *ntfs_big_inode_cache;
extern struct kmem_cache *ntfs_attr_ctx_cache;
extern struct kmem_cache *ntfs_index_ctx_cache;

/* The various operations structs defined throughout the driver files. */
extern const struct address_space_operations ntfs_normal_aops;
extern const struct address_space_operations ntfs_compressed_aops;
extern const struct address_space_operations ntfs_mst_aops;

extern const struct  file_operations ntfs_file_ops;
extern const struct inode_operations ntfs_file_inode_ops;

extern const struct  file_operations ntfs_dir_ops;
extern const struct inode_operations ntfs_dir_inode_ops;

extern const struct  file_operations ntfs_empty_file_ops;
extern const struct inode_operations ntfs_empty_inode_ops;

extern const struct export_operations ntfs_export_ops;

/**
 * NTFS_SB - return the ntfs volume given a vfs super block
 * @sb:		VFS super block
 *
 * NTFS_SB() returns the ntfs volume associated with the VFS super block @sb.
 */
static inline ntfs_volume *NTFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

/* Declarations of functions and global variables. */

/* From fs/ntfs/compress.c */
extern int ntfs_read_compressed_block(struct page *page);
extern int allocate_compression_buffers(void);
extern void free_compression_buffers(void);

/* From fs/ntfs/super.c */
#define default_upcase_len 0x10000
extern struct mutex ntfs_lock;

typedef struct {
	int val;
	char *str;
} option_t;
extern const option_t on_errors_arr[];

/* From fs/ntfs/mst.c */
extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
extern void post_write_mst_fixup(NTFS_RECORD *b);

/* From fs/ntfs/unistr.c */
extern bool ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
		const ntfschar *s2, size_t s2_len,
		const IGNORE_CASE_BOOL ic,
		const ntfschar *upcase, const u32 upcase_size);
extern int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
		const ntfschar *name2, const u32 name2_len,
		const int err_val, const IGNORE_CASE_BOOL ic,
		const ntfschar *upcase, const u32 upcase_len);
extern int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n);
extern int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
		const ntfschar *upcase, const u32 upcase_size);
extern void ntfs_upcase_name(ntfschar *name, u32 name_len,
		const ntfschar *upcase, const u32 upcase_len);
extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
		const ntfschar *upcase, const u32 upcase_len);
extern int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
		FILE_NAME_ATTR *file_name_attr2,
		const int err_val, const IGNORE_CASE_BOOL ic,
		const ntfschar *upcase, const u32 upcase_len);
extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
		const int ins_len, ntfschar **outs);
extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
		const int ins_len, unsigned char **outs, int outs_len);

/* From fs/ntfs/upcase.c */
extern ntfschar *generate_default_upcase(void);

static inline int ntfs_ffs(int x)
{
	int r = 1;

	if (!x)
		return 0;
	if (!(x & 0xffff)) {
		x >>= 16;
		r += 16;
	}
	if (!(x & 0xff)) {
		x >>= 8;
		r += 8;
	}
	if (!(x & 0xf)) {
		x >>= 4;
		r += 4;
	}
	if (!(x & 3)) {
		x >>= 2;
		r += 2;
	}
	if (!(x & 1)) {
		x >>= 1;
		r += 1;
	}
	return r;
}

#endif /* _LINUX_NTFS_H */