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 #include <linux/config.h>
  16
  17 #include <linux/fs.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/slab.h>
  21 #include <linux/stat.h>
  22 #include <linux/fcntl.h>
  23 #include <linux/pagemap.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/byteorder.h>
  27 #include <asm/unaligned.h>
  28 #include <asm/string.h>
  29
  30 #ifdef CONFIG_NCPFS_NLS
  31 #include <linux/nls.h>
  32 #else
  33 #include <linux/ctype.h>
  34 #endif /* CONFIG_NCPFS_NLS */
  35
  36 #include <linux/ncp_fs.h>
  37
  38 #define NCP_MIN_SYMLINK_SIZE    8
  39 #define NCP_MAX_SYMLINK_SIZE    512
  40
  41 #define NCP_BLOCK_SHIFT         9
  42 #define NCP_BLOCK_SIZE          (1 << (NCP_BLOCK_SHIFT))
  43
  44 int ncp_negotiate_buffersize(struct ncp_server *, int, int *);
  45 int ncp_negotiate_size_and_options(struct ncp_server *server, int size,
  46                           int options, int *ret_size, int *ret_options);
  47
  48 int ncp_get_volume_info_with_number(struct ncp_server* server, int n,
  49                                     struct ncp_volume_info *target);
  50
  51 int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle,
  52                            struct ncp_volume_info* target);
  53
  54 int ncp_close_file(struct ncp_server *, const char *);
  55 static inline int ncp_read_bounce_size(__u32 size) {
  56         return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
  57 };
  58 int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16,
  59                 char __user *, int *, void* bounce, __u32 bouncelen);
  60 int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16,
  61                 char *, int *);
  62 int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,
  63                 const char *, int *);
  64
  65 static inline void ncp_inode_close(struct inode *inode) {
  66         atomic_dec(&NCP_FINFO(inode)->opened);
  67 }
  68
  69 void ncp_extract_file_info(void* src, struct nw_info_struct* target);
  70 int ncp_obtain_info(struct ncp_server *server, struct inode *, char *,
  71                 struct nw_info_struct *target);
  72 int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target);
  73 int ncp_get_volume_root(struct ncp_server *server, const char *volname,
  74                         __u32 *volume, __le32 *dirent, __le32 *dosdirent);
  75 int ncp_lookup_volume(struct ncp_server *, const char *, struct nw_info_struct *);
  76 int ncp_modify_file_or_subdir_dos_info(struct ncp_server *, struct inode *,
  77          __le32, const struct nw_modify_dos_info *info);
  78 int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *, struct inode *,
  79          const char* path, __le32, const struct nw_modify_dos_info *info);
  80 int ncp_modify_nfs_info(struct ncp_server *, __u8 volnum, __le32 dirent,
  81                         __u32 mode, __u32 rdev);
  82
  83 int ncp_del_file_or_subdir2(struct ncp_server *, struct dentry*);
  84 int ncp_del_file_or_subdir(struct ncp_server *, struct inode *, char *);
  85 int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, char *,
  86                                 int, __le32, __le16, struct ncp_entry_info *);
  87
  88 int ncp_initialize_search(struct ncp_server *, struct inode *,
  89                       struct nw_search_sequence *target);
  90 int ncp_search_for_file_or_subdir(struct ncp_server *server,
  91                               struct nw_search_sequence *seq,
  92                               struct nw_info_struct *target);
  93 int ncp_search_for_fileset(struct ncp_server *server,
  94                            struct nw_search_sequence *seq,
  95                            int* more, int* cnt,
  96                            char* buffer, size_t bufsize,
  97                            char** rbuf, size_t* rsize);
  98
  99 int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
 100                               struct inode *, char *, struct inode *, char *);
 101
 102
 103 int
 104 ncp_LogPhysicalRecord(struct ncp_server *server,
 105                       const char *file_id, __u8 locktype,
 106                       __u32 offset, __u32 length, __u16 timeout);
 107
 108 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 109 int
 110 ncp_ClearPhysicalRecord(struct ncp_server *server,
 111                         const char *file_id,
 112                         __u32 offset, __u32 length);
 113 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 114
 115 int
 116 ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32,
 117                  __u32* volume, __le32* dirent, __le32* dosdirent);
 118 int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle);
 119 int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle);
 120
 121 int ncp_create_new(struct inode *dir, struct dentry *dentry,
 122                           int mode, dev_t rdev, __le32 attributes);
 123
 124 static inline int ncp_is_nfs_extras(struct ncp_server* server, unsigned int volnum) {
 125 #ifdef CONFIG_NCPFS_NFS_NS
 126         return (server->m.flags & NCP_MOUNT_NFS_EXTRAS) &&
 127                (server->name_space[volnum] == NW_NS_NFS);
 128 #else
 129         return 0;
 130 #endif
 131 }
 132
 133 #ifdef CONFIG_NCPFS_NLS
 134
 135 int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *,
 136                                 const unsigned char *, unsigned int, int);
 137 int ncp__vol2io(struct ncp_server *, unsigned char *, unsigned int *,
 138                                 const unsigned char *, unsigned int, int);
 139
 140 #define NCP_ESC                 ':'
 141 #define NCP_IO_TABLE(dentry)    (NCP_SERVER((dentry)->d_inode)->nls_io)
 142 #define ncp_tolower(t, c)       nls_tolower(t, c)
 143 #define ncp_toupper(t, c)       nls_toupper(t, c)
 144 #define ncp_strnicmp(t, s1, s2, len) \
 145         nls_strnicmp(t, s1, s2, len)
 146 #define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(S,m,i,n,k,U)
 147 #define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(S,m,i,n,k,U)
 148
 149 #else
 150
 151 int ncp__io2vol(unsigned char *, unsigned int *,
 152                                 const unsigned char *, unsigned int, int);
 153 int ncp__vol2io(unsigned char *, unsigned int *,
 154                                 const unsigned char *, unsigned int, int);
 155
 156 #define NCP_IO_TABLE(dentry)    NULL
 157 #define ncp_tolower(t, c)       tolower(c)
 158 #define ncp_toupper(t, c)       toupper(c)
 159 #define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(m,i,n,k,U)
 160 #define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(m,i,n,k,U)
 161
 162
 163 static inline int ncp_strnicmp(struct nls_table *t, const unsigned char *s1,
 164                 const unsigned char *s2, int len)
 165 {
 166         while (len--) {
 167                 if (tolower(*s1++) != tolower(*s2++))
 168                         return 1;
 169         }
 170
 171         return 0;
 172 }
 173
 174 #endif /* CONFIG_NCPFS_NLS */
 175
 176 #define NCP_GET_AGE(dentry)     (jiffies - (dentry)->d_time)
 177 #define NCP_MAX_AGE(server)     ((server)->dentry_ttl)
 178 #define NCP_TEST_AGE(server,dentry)     (NCP_GET_AGE(dentry) < NCP_MAX_AGE(server))
 179
 180 static inline void
 181 ncp_age_dentry(struct ncp_server* server, struct dentry* dentry)
 182 {
 183         dentry->d_time = jiffies - server->dentry_ttl;
 184 }
 185
 186 static inline void
 187 ncp_new_dentry(struct dentry* dentry)
 188 {
 189         dentry->d_time = jiffies;
 190 }
 191
 192 static inline void
 193 ncp_renew_dentries(struct dentry *parent)
 194 {
 195         struct ncp_server *server = NCP_SERVER(parent->d_inode);
 196         struct list_head *next;
 197         struct dentry *dentry;
 198
 199         spin_lock(&dcache_lock);
 200         next = parent->d_subdirs.next;
 201         while (next != &parent->d_subdirs) {
 202                 dentry = list_entry(next, struct dentry, d_child);
 203
 204                 if (dentry->d_fsdata == NULL)
 205                         ncp_age_dentry(server, dentry);
 206                 else
 207                         ncp_new_dentry(dentry);
 208
 209                 next = next->next;
 210         }
 211         spin_unlock(&dcache_lock);
 212 }
 213
 214 static inline void
 215 ncp_invalidate_dircache_entries(struct dentry *parent)
 216 {
 217         struct ncp_server *server = NCP_SERVER(parent->d_inode);
 218         struct list_head *next;
 219         struct dentry *dentry;
 220
 221         spin_lock(&dcache_lock);
 222         next = parent->d_subdirs.next;
 223         while (next != &parent->d_subdirs) {
 224                 dentry = list_entry(next, struct dentry, d_child);
 225                 dentry->d_fsdata = NULL;
 226                 ncp_age_dentry(server, dentry);
 227                 next = next->next;
 228         }
 229         spin_unlock(&dcache_lock);
 230 }
 231
 232 struct ncp_cache_head {
 233         time_t          mtime;
 234         unsigned long   time;   /* cache age */
 235         unsigned long   end;    /* last valid fpos in cache */
 236         int             eof;
 237 };
 238
 239 #define NCP_DIRCACHE_SIZE       ((int)(PAGE_CACHE_SIZE/sizeof(struct dentry *)))
 240 union ncp_dir_cache {
 241         struct ncp_cache_head   head;
 242         struct dentry           *dentry[NCP_DIRCACHE_SIZE];
 243 };
 244
 245 #define NCP_FIRSTCACHE_SIZE     ((int)((NCP_DIRCACHE_SIZE * \
 246         sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \
 247         sizeof(struct dentry *)))
 248
 249 #define NCP_DIRCACHE_START      (NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE)
 250
 251 struct ncp_cache_control {
 252         struct  ncp_cache_head          head;
 253         struct  page                    *page;
 254         union   ncp_dir_cache           *cache;
 255         unsigned long                   fpos, ofs;
 256         int                             filled, valid, idx;
 257 };
 258
 259 #endif /* _NCPLIB_H */