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(const void* src, struct nw_info_struct* target);
  69 int ncp_obtain_info(struct ncp_server *server, struct inode *, const 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_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns);
  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 *, const char *);
  85 int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const 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_fileset(struct ncp_server *server,
  91                            struct nw_search_sequence *seq,
  92                            int* more, int* cnt,
  93                            char* buffer, size_t bufsize,
  94                            char** rbuf, size_t* rsize);
  95
  96 int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
  97                               struct inode *, const char *, struct inode *, const char *);
  98
  99
 100 int
 101 ncp_LogPhysicalRecord(struct ncp_server *server,
 102                       const char *file_id, __u8 locktype,
 103                       __u32 offset, __u32 length, __u16 timeout);
 104
 105 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 106 int
 107 ncp_ClearPhysicalRecord(struct ncp_server *server,
 108                         const char *file_id,
 109                         __u32 offset, __u32 length);
 110 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 111
 112 int
 113 ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32,
 114                  __u32* volume, __le32* dirent, __le32* dosdirent);
 115 int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle);
 116 int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle);
 117
 118 int ncp_create_new(struct inode *dir, struct dentry *dentry,
 119                           int mode, dev_t rdev, __le32 attributes);
 120
 121 static inline int ncp_is_nfs_extras(struct ncp_server* server, unsigned int volnum) {
 122 #ifdef CONFIG_NCPFS_NFS_NS
 123         return (server->m.flags & NCP_MOUNT_NFS_EXTRAS) &&
 124                (server->name_space[volnum] == NW_NS_NFS);
 125 #else
 126         return 0;
 127 #endif
 128 }
 129
 130 #ifdef CONFIG_NCPFS_NLS
 131
 132 int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *,
 133                                 const unsigned char *, unsigned int, int);
 134 int ncp__vol2io(struct ncp_server *, unsigned char *, unsigned int *,
 135                                 const unsigned char *, unsigned int, int);
 136
 137 #define NCP_ESC                 ':'
 138 #define NCP_IO_TABLE(sb)        (NCP_SBP(sb)->nls_io)
 139 #define ncp_tolower(t, c)       nls_tolower(t, c)
 140 #define ncp_toupper(t, c)       nls_toupper(t, c)
 141 #define ncp_strnicmp(t, s1, s2, len) \
 142         nls_strnicmp(t, s1, s2, len)
 143 #define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(S,m,i,n,k,U)
 144 #define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(S,m,i,n,k,U)
 145
 146 #else
 147
 148 int ncp__io2vol(unsigned char *, unsigned int *,
 149                                 const unsigned char *, unsigned int, int);
 150 int ncp__vol2io(unsigned char *, unsigned int *,
 151                                 const unsigned char *, unsigned int, int);
 152
 153 #define NCP_IO_TABLE(sb)        NULL
 154 #define ncp_tolower(t, c)       tolower(c)
 155 #define ncp_toupper(t, c)       toupper(c)
 156 #define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(m,i,n,k,U)
 157 #define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(m,i,n,k,U)
 158
 159
 160 static inline int ncp_strnicmp(const struct nls_table *t,
 161                 const unsigned char *s1, const unsigned char *s2, int len)
 162 {
 163         while (len--) {
 164                 if (tolower(*s1++) != tolower(*s2++))
 165                         return 1;
 166         }
 167
 168         return 0;
 169 }
 170
 171 #endif /* CONFIG_NCPFS_NLS */
 172
 173 #define NCP_GET_AGE(dentry)     (jiffies - (dentry)->d_time)
 174 #define NCP_MAX_AGE(server)     atomic_read(&(server)->dentry_ttl)
 175 #define NCP_TEST_AGE(server,dentry)     (NCP_GET_AGE(dentry) < NCP_MAX_AGE(server))
 176
 177 static inline void
 178 ncp_age_dentry(struct ncp_server* server, struct dentry* dentry)
 179 {
 180         dentry->d_time = jiffies - NCP_MAX_AGE(server);
 181 }
 182
 183 static inline void
 184 ncp_new_dentry(struct dentry* dentry)
 185 {
 186         dentry->d_time = jiffies;
 187 }
 188
 189 static inline void
 190 ncp_renew_dentries(struct dentry *parent)
 191 {
 192         struct ncp_server *server = NCP_SERVER(parent->d_inode);
 193         struct list_head *next;
 194         struct dentry *dentry;
 195
 196         spin_lock(&parent->d_lock);
 197         next = parent->d_subdirs.next;
 198         while (next != &parent->d_subdirs) {
 199                 dentry = list_entry(next, struct dentry, d_u.d_child);
 200
 201                 if (dentry->d_fsdata == NULL)
 202                         ncp_age_dentry(server, dentry);
 203                 else
 204                         ncp_new_dentry(dentry);
 205
 206                 next = next->next;
 207         }
 208         spin_unlock(&parent->d_lock);
 209 }
 210
 211 static inline void
 212 ncp_invalidate_dircache_entries(struct dentry *parent)
 213 {
 214         struct ncp_server *server = NCP_SERVER(parent->d_inode);
 215         struct list_head *next;
 216         struct dentry *dentry;
 217
 218         spin_lock(&parent->d_lock);
 219         next = parent->d_subdirs.next;
 220         while (next != &parent->d_subdirs) {
 221                 dentry = list_entry(next, struct dentry, d_u.d_child);
 222                 dentry->d_fsdata = NULL;
 223                 ncp_age_dentry(server, dentry);
 224                 next = next->next;
 225         }
 226         spin_unlock(&parent->d_lock);
 227 }
 228
 229 struct ncp_cache_head {
 230         time_t          mtime;
 231         unsigned long   time;   /* cache age */
 232         unsigned long   end;    /* last valid fpos in cache */
 233         int             eof;
 234 };
 235
 236 #define NCP_DIRCACHE_SIZE       ((int)(PAGE_CACHE_SIZE/sizeof(struct dentry *)))
 237 union ncp_dir_cache {
 238         struct ncp_cache_head   head;
 239         struct dentry           *dentry[NCP_DIRCACHE_SIZE];
 240 };
 241
 242 #define NCP_FIRSTCACHE_SIZE     ((int)((NCP_DIRCACHE_SIZE * \
 243         sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \
 244         sizeof(struct dentry *)))
 245
 246 #define NCP_DIRCACHE_START      (NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE)
 247
 248 struct ncp_cache_control {
 249         struct  ncp_cache_head          head;
 250         struct  page                    *page;
 251         union   ncp_dir_cache           *cache;
 252         unsigned long                   fpos, ofs;
 253         int                             filled, valid, idx;
 254 };
 255
 256 #endif /* _NCPLIB_H */