ncplib_kernel.h

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/*
 *  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 <asm/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, 
        char __user *, 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;
}

static inline void
ncp_renew_dentries(struct dentry *parent)
{
    struct ncp_server *server = NCP_SERVER(parent->d_inode);
    struct list_head *next;
    struct dentry *dentry;

    spin_lock(&parent->d_lock);
    next = parent->d_subdirs.next;
    while (next != &parent->d_subdirs) {
        dentry = list_entry(next, struct dentry, d_u.d_child);

        if (dentry->d_fsdata == NULL)
            ncp_age_dentry(server, dentry);
        else
            ncp_new_dentry(dentry);

        next = next->next;
    }
    spin_unlock(&parent->d_lock);
}

static inline void
ncp_invalidate_dircache_entries(struct dentry *parent)
{
    struct ncp_server *server = NCP_SERVER(parent->d_inode);
    struct list_head *next;
    struct dentry *dentry;

    spin_lock(&parent->d_lock);
    next = parent->d_subdirs.next;
    while (next != &parent->d_subdirs) {
        dentry = list_entry(next, struct dentry, d_u.d_child);
        dentry->d_fsdata = NULL;
        ncp_age_dentry(server, dentry);
        next = next->next;
    }
    spin_unlock(&parent->d_lock);
}

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_CACHE_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 */