fs/ncpfs/ncplib_kernel.h

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