linux/fs/ncpfs/ncplib_kernel.h
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   1/*
   2 *  ncplib_kernel.h
   3 *
   4 *  Copyright (C) 1995, 1996 by Volker Lendecke
   5 *  Modified for big endian by J.F. Chadima and David S. Miller
   6 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
   7 *  Modified 1998, 1999 Wolfram Pienkoss for NLS
   8 *  Modified 1999 Wolfram Pienkoss for directory caching
   9 *
  10 */
  11
  12#ifndef _NCPLIB_H
  13#define _NCPLIB_H
  14
  15
  16#include <linux/fs.h>
  17#include <linux/types.h>
  18#include <linux/errno.h>
  19#include <linux/slab.h>
  20#include <linux/stat.h>
  21#include <linux/fcntl.h>
  22#include <linux/pagemap.h>
  23
  24#include <asm/uaccess.h>
  25#include <asm/byteorder.h>
  26#include <asm/unaligned.h>
  27#include <asm/string.h>
  28
  29#ifdef CONFIG_NCPFS_NLS
  30#include <linux/nls.h>
  31#else
  32#include <linux/ctype.h>
  33#endif /* CONFIG_NCPFS_NLS */
  34
  35#define NCP_MIN_SYMLINK_SIZE    8
  36#define NCP_MAX_SYMLINK_SIZE    512
  37
  38#define NCP_BLOCK_SHIFT         9
  39#define NCP_BLOCK_SIZE          (1 << (NCP_BLOCK_SHIFT))
  40
  41int ncp_negotiate_buffersize(struct ncp_server *, int, int *);
  42int ncp_negotiate_size_and_options(struct ncp_server *server, int size,
  43                          int options, int *ret_size, int *ret_options);
  44
  45int ncp_get_volume_info_with_number(struct ncp_server* server, int n,
  46                                    struct ncp_volume_info *target);
  47
  48int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle,
  49                           struct ncp_volume_info* target);
  50
  51int ncp_close_file(struct ncp_server *, const char *);
  52static inline int ncp_read_bounce_size(__u32 size) {
  53        return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
  54};
  55int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16, 
  56                char __user *, int *, void* bounce, __u32 bouncelen);
  57int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16, 
  58                char *, int *);
  59int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,
  60                const char *, int *);
  61
  62static inline void ncp_inode_close(struct inode *inode) {
  63        atomic_dec(&NCP_FINFO(inode)->opened);
  64}
  65
  66void ncp_extract_file_info(const void* src, struct nw_info_struct* target);
  67int ncp_obtain_info(struct ncp_server *server, struct inode *, const char *,
  68                struct nw_info_struct *target);
  69int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target);
  70int ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns);
  71int ncp_get_volume_root(struct ncp_server *server, const char *volname,
  72                        __u32 *volume, __le32 *dirent, __le32 *dosdirent);
  73int ncp_lookup_volume(struct ncp_server *, const char *, struct nw_info_struct *);
  74int ncp_modify_file_or_subdir_dos_info(struct ncp_server *, struct inode *,
  75         __le32, const struct nw_modify_dos_info *info);
  76int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *, struct inode *,
  77         const char* path, __le32, const struct nw_modify_dos_info *info);
  78int ncp_modify_nfs_info(struct ncp_server *, __u8 volnum, __le32 dirent,
  79                        __u32 mode, __u32 rdev);
  80
  81int ncp_del_file_or_subdir2(struct ncp_server *, struct dentry*);
  82int ncp_del_file_or_subdir(struct ncp_server *, struct inode *, const char *);
  83int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const char *,
  84                                int, __le32, __le16, struct ncp_entry_info *);
  85
  86int ncp_initialize_search(struct ncp_server *, struct inode *,
  87                      struct nw_search_sequence *target);
  88int ncp_search_for_fileset(struct ncp_server *server,
  89                           struct nw_search_sequence *seq,
  90                           int* more, int* cnt,
  91                           char* buffer, size_t bufsize,
  92                           char** rbuf, size_t* rsize);
  93
  94int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
  95                              struct inode *, const char *, struct inode *, const char *);
  96
  97
  98int
  99ncp_LogPhysicalRecord(struct ncp_server *server,
 100                      const char *file_id, __u8 locktype,
 101                      __u32 offset, __u32 length, __u16 timeout);
 102
 103#ifdef CONFIG_NCPFS_IOCTL_LOCKING
 104int
 105ncp_ClearPhysicalRecord(struct ncp_server *server,
 106                        const char *file_id,
 107                        __u32 offset, __u32 length);
 108#endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 109
 110int
 111ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32,
 112                 __u32* volume, __le32* dirent, __le32* dosdirent);
 113int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle);
 114int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle);
 115
 116int ncp_create_new(struct inode *dir, struct dentry *dentry,
 117                          umode_t mode, dev_t rdev, __le32 attributes);
 118
 119static inline int ncp_is_nfs_extras(struct ncp_server* server, unsigned int volnum) {
 120#ifdef CONFIG_NCPFS_NFS_NS
 121        return (server->m.flags & NCP_MOUNT_NFS_EXTRAS) &&
 122               (server->name_space[volnum] == NW_NS_NFS);
 123#else
 124        return 0;
 125#endif
 126}
 127
 128#ifdef CONFIG_NCPFS_NLS
 129
 130int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *,
 131                                const unsigned char *, unsigned int, int);
 132int ncp__vol2io(struct ncp_server *, unsigned char *, unsigned int *,
 133                                const unsigned char *, unsigned int, int);
 134
 135#define NCP_ESC                 ':'
 136#define NCP_IO_TABLE(sb)        (NCP_SBP(sb)->nls_io)
 137#define ncp_tolower(t, c)       nls_tolower(t, c)
 138#define ncp_toupper(t, c)       nls_toupper(t, c)
 139#define ncp_strnicmp(t, s1, s2, len) \
 140        nls_strnicmp(t, s1, s2, len)
 141#define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(S,m,i,n,k,U)
 142#define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(S,m,i,n,k,U)
 143
 144#else
 145
 146int ncp__io2vol(unsigned char *, unsigned int *,
 147                                const unsigned char *, unsigned int, int);
 148int ncp__vol2io(unsigned char *, unsigned int *,
 149                                const unsigned char *, unsigned int, int);
 150
 151#define NCP_IO_TABLE(sb)        NULL
 152#define ncp_tolower(t, c)       tolower(c)
 153#define ncp_toupper(t, c)       toupper(c)
 154#define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(m,i,n,k,U)
 155#define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(m,i,n,k,U)
 156
 157
 158static inline int ncp_strnicmp(const struct nls_table *t,
 159                const unsigned char *s1, const unsigned char *s2, int len)
 160{
 161        while (len--) {
 162                if (tolower(*s1++) != tolower(*s2++))
 163                        return 1;
 164        }
 165
 166        return 0;
 167}
 168
 169#endif /* CONFIG_NCPFS_NLS */
 170
 171#define NCP_GET_AGE(dentry)     (jiffies - (dentry)->d_time)
 172#define NCP_MAX_AGE(server)     atomic_read(&(server)->dentry_ttl)
 173#define NCP_TEST_AGE(server,dentry)     (NCP_GET_AGE(dentry) < NCP_MAX_AGE(server))
 174
 175static inline void
 176ncp_age_dentry(struct ncp_server* server, struct dentry* dentry)
 177{
 178        dentry->d_time = jiffies - NCP_MAX_AGE(server);
 179}
 180
 181static inline void
 182ncp_new_dentry(struct dentry* dentry)
 183{
 184        dentry->d_time = jiffies;
 185}
 186
 187static inline void
 188ncp_renew_dentries(struct dentry *parent)
 189{
 190        struct ncp_server *server = NCP_SERVER(parent->d_inode);
 191        struct list_head *next;
 192        struct dentry *dentry;
 193
 194        spin_lock(&parent->d_lock);
 195        next = parent->d_subdirs.next;
 196        while (next != &parent->d_subdirs) {
 197                dentry = list_entry(next, struct dentry, d_u.d_child);
 198
 199                if (dentry->d_fsdata == NULL)
 200                        ncp_age_dentry(server, dentry);
 201                else
 202                        ncp_new_dentry(dentry);
 203
 204                next = next->next;
 205        }
 206        spin_unlock(&parent->d_lock);
 207}
 208
 209static inline void
 210ncp_invalidate_dircache_entries(struct dentry *parent)
 211{
 212        struct ncp_server *server = NCP_SERVER(parent->d_inode);
 213        struct list_head *next;
 214        struct dentry *dentry;
 215
 216        spin_lock(&parent->d_lock);
 217        next = parent->d_subdirs.next;
 218        while (next != &parent->d_subdirs) {
 219                dentry = list_entry(next, struct dentry, d_u.d_child);
 220                dentry->d_fsdata = NULL;
 221                ncp_age_dentry(server, dentry);
 222                next = next->next;
 223        }
 224        spin_unlock(&parent->d_lock);
 225}
 226
 227struct ncp_cache_head {
 228        time_t          mtime;
 229        unsigned long   time;   /* cache age */
 230        unsigned long   end;    /* last valid fpos in cache */
 231        int             eof;
 232};
 233
 234#define NCP_DIRCACHE_SIZE       ((int)(PAGE_CACHE_SIZE/sizeof(struct dentry *)))
 235union ncp_dir_cache {
 236        struct ncp_cache_head   head;
 237        struct dentry           *dentry[NCP_DIRCACHE_SIZE];
 238};
 239
 240#define NCP_FIRSTCACHE_SIZE     ((int)((NCP_DIRCACHE_SIZE * \
 241        sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \
 242        sizeof(struct dentry *)))
 243
 244#define NCP_DIRCACHE_START      (NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE)
 245
 246struct ncp_cache_control {
 247        struct  ncp_cache_head          head;
 248        struct  page                    *page;
 249        union   ncp_dir_cache           *cache;
 250        unsigned long                   fpos, ofs;
 251        int                             filled, valid, idx;
 252};
 253
 254#endif /* _NCPLIB_H */
 255
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