/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  ncplib_kernel.h
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified for big endian by J.F. Chadima and David S. Miller
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *  Modified 1998, 1999 Wolfram Pienkoss for NLS
 *  Modified 1999 Wolfram Pienkoss for directory caching
 *
 */

#ifndef _NCPLIB_H
#define _NCPLIB_H


#include <linux/fs.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/pagemap.h>

#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <asm/string.h>

#ifdef CONFIG_NCPFS_NLS
#include <linux/nls.h>
#else
#include <linux/ctype.h>
#endif /* CONFIG_NCPFS_NLS */

#define NCP_MIN_SYMLINK_SIZE	8
#define NCP_MAX_SYMLINK_SIZE	512

#define NCP_BLOCK_SHIFT		9
#define NCP_BLOCK_SIZE		(1 << (NCP_BLOCK_SHIFT))

int ncp_negotiate_buffersize(struct ncp_server *, int, int *);
int ncp_negotiate_size_and_options(struct ncp_server *server, int size,
  			  int options, int *ret_size, int *ret_options);

int ncp_get_volume_info_with_number(struct ncp_server* server, int n,
				    struct ncp_volume_info *target);

int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle,
			   struct ncp_volume_info* target);

int ncp_close_file(struct ncp_server *, const char *);
static inline int ncp_read_bounce_size(__u32 size) {
	return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
};
int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16, 
		struct iov_iter *, int *, void *bounce, __u32 bouncelen);
int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16, 
		char *, int *);
int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,
		const char *, int *);

static inline void ncp_inode_close(struct inode *inode) {
	atomic_dec(&NCP_FINFO(inode)->opened);
}

void ncp_extract_file_info(const void* src, struct nw_info_struct* target);
int ncp_obtain_info(struct ncp_server *server, struct inode *, const char *,
		struct nw_info_struct *target);
int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target);
int ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns);
int ncp_get_volume_root(struct ncp_server *server, const char *volname,
			__u32 *volume, __le32 *dirent, __le32 *dosdirent);
int ncp_lookup_volume(struct ncp_server *, const char *, struct nw_info_struct *);
int ncp_modify_file_or_subdir_dos_info(struct ncp_server *, struct inode *,
	 __le32, const struct nw_modify_dos_info *info);
int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *, struct inode *,
	 const char* path, __le32, const struct nw_modify_dos_info *info);
int ncp_modify_nfs_info(struct ncp_server *, __u8 volnum, __le32 dirent,
			__u32 mode, __u32 rdev);

int ncp_del_file_or_subdir2(struct ncp_server *, struct dentry*);
int ncp_del_file_or_subdir(struct ncp_server *, struct inode *, const char *);
int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const char *,
				int, __le32, __le16, struct ncp_entry_info *);

int ncp_initialize_search(struct ncp_server *, struct inode *,
		      struct nw_search_sequence *target);
int ncp_search_for_fileset(struct ncp_server *server,
			   struct nw_search_sequence *seq,
			   int* more, int* cnt,
			   char* buffer, size_t bufsize,
			   char** rbuf, size_t* rsize);

int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
			      struct inode *, const char *, struct inode *, const char *);


int
ncp_LogPhysicalRecord(struct ncp_server *server,
		      const char *file_id, __u8 locktype,
		      __u32 offset, __u32 length, __u16 timeout);

#ifdef CONFIG_NCPFS_IOCTL_LOCKING
int
ncp_ClearPhysicalRecord(struct ncp_server *server,
			const char *file_id,
			__u32 offset, __u32 length);
#endif	/* CONFIG_NCPFS_IOCTL_LOCKING */

int
ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32,
		 __u32* volume, __le32* dirent, __le32* dosdirent);
int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle);
int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle);

int ncp_create_new(struct inode *dir, struct dentry *dentry,
                          umode_t mode, dev_t rdev, __le32 attributes);

static inline int ncp_is_nfs_extras(struct ncp_server* server, unsigned int volnum) {
#ifdef CONFIG_NCPFS_NFS_NS
	return (server->m.flags & NCP_MOUNT_NFS_EXTRAS) &&
	       (server->name_space[volnum] == NW_NS_NFS);
#else
	return 0;
#endif
}

#ifdef CONFIG_NCPFS_NLS

int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *,
				const unsigned char *, unsigned int, int);
int ncp__vol2io(struct ncp_server *, unsigned char *, unsigned int *,
				const unsigned char *, unsigned int, int);

#define NCP_ESC			':'
#define NCP_IO_TABLE(sb)	(NCP_SBP(sb)->nls_io)
#define ncp_tolower(t, c)	nls_tolower(t, c)
#define ncp_toupper(t, c)	nls_toupper(t, c)
#define ncp_strnicmp(t, s1, s2, len) \
	nls_strnicmp(t, s1, s2, len)
#define ncp_io2vol(S,m,i,n,k,U)	ncp__io2vol(S,m,i,n,k,U)
#define ncp_vol2io(S,m,i,n,k,U)	ncp__vol2io(S,m,i,n,k,U)

#else

int ncp__io2vol(unsigned char *, unsigned int *,
				const unsigned char *, unsigned int, int);
int ncp__vol2io(unsigned char *, unsigned int *,
				const unsigned char *, unsigned int, int);

#define NCP_IO_TABLE(sb)	NULL
#define ncp_tolower(t, c)	tolower(c)
#define ncp_toupper(t, c)	toupper(c)
#define ncp_io2vol(S,m,i,n,k,U)	ncp__io2vol(m,i,n,k,U)
#define ncp_vol2io(S,m,i,n,k,U)	ncp__vol2io(m,i,n,k,U)


static inline int ncp_strnicmp(const struct nls_table *t,
		const unsigned char *s1, const unsigned char *s2, int len)
{
	while (len--) {
		if (tolower(*s1++) != tolower(*s2++))
			return 1;
	}

	return 0;
}

#endif /* CONFIG_NCPFS_NLS */

#define NCP_GET_AGE(dentry)	(jiffies - (dentry)->d_time)
#define NCP_MAX_AGE(server)	atomic_read(&(server)->dentry_ttl)
#define NCP_TEST_AGE(server,dentry)	(NCP_GET_AGE(dentry) < NCP_MAX_AGE(server))

static inline void
ncp_age_dentry(struct ncp_server* server, struct dentry* dentry)
{
	dentry->d_time = jiffies - NCP_MAX_AGE(server);
}

static inline void
ncp_new_dentry(struct dentry* dentry)
{
	dentry->d_time = jiffies;
}

struct ncp_cache_head {
	time_t		mtime;
	unsigned long	time;	/* cache age */
	unsigned long	end;	/* last valid fpos in cache */
	int		eof;
};

#define NCP_DIRCACHE_SIZE	((int)(PAGE_SIZE/sizeof(struct dentry *)))
union ncp_dir_cache {
	struct ncp_cache_head	head;
	struct dentry		*dentry[NCP_DIRCACHE_SIZE];
};

#define NCP_FIRSTCACHE_SIZE	((int)((NCP_DIRCACHE_SIZE * \
	sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \
	sizeof(struct dentry *)))

#define NCP_DIRCACHE_START	(NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE)

struct ncp_cache_control {
	struct	ncp_cache_head		head;
	struct	page			*page;
	union	ncp_dir_cache		*cache;
	unsigned long			fpos, ofs;
	int				filled, valid, idx;
};

#endif /* _NCPLIB_H */