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 #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
  41 int ncp_negotiate_buffersize(struct ncp_server *, int, int *);
  42 int ncp_negotiate_size_and_options(struct ncp_server *server, int size,
  43                           int options, int *ret_size, int *ret_options);
  44
  45 int ncp_get_volume_info_with_number(struct ncp_server* server, int n,
  46                                     struct ncp_volume_info *target);
  47
  48 int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle,
  49                            struct ncp_volume_info* target);
  50
  51 int ncp_close_file(struct ncp_server *, const char *);
  52 static inline int ncp_read_bounce_size(__u32 size) {
  53         return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
  54 };
  55 int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16,
  56                 char __user *, int *, void* bounce, __u32 bouncelen);
  57 int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16,
  58                 char *, int *);
  59 int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,
  60                 const char *, int *);
  61
  62 static inline void ncp_inode_close(struct inode *inode) {
  63         atomic_dec(&NCP_FINFO(inode)->opened);
  64 }
  65
  66 void ncp_extract_file_info(const void* src, struct nw_info_struct* target);
  67 int ncp_obtain_info(struct ncp_server *server, struct inode *, const char *,
  68                 struct nw_info_struct *target);
  69 int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target);
  70 int ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns);
  71 int ncp_get_volume_root(struct ncp_server *server, const char *volname,
  72                         __u32 *volume, __le32 *dirent, __le32 *dosdirent);
  73 int ncp_lookup_volume(struct ncp_server *, const char *, struct nw_info_struct *);
  74 int ncp_modify_file_or_subdir_dos_info(struct ncp_server *, struct inode *,
  75          __le32, const struct nw_modify_dos_info *info);
  76 int 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);
  78 int ncp_modify_nfs_info(struct ncp_server *, __u8 volnum, __le32 dirent,
  79                         __u32 mode, __u32 rdev);
  80
  81 int ncp_del_file_or_subdir2(struct ncp_server *, struct dentry*);
  82 int ncp_del_file_or_subdir(struct ncp_server *, struct inode *, const char *);
  83 int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const char *,
  84                                 int, __le32, __le16, struct ncp_entry_info *);
  85
  86 int ncp_initialize_search(struct ncp_server *, struct inode *,
  87                       struct nw_search_sequence *target);
  88 int 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
  94 int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
  95                               struct inode *, const char *, struct inode *, const char *);
  96
  97
  98 int
  99 ncp_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
 104 int
 105 ncp_ClearPhysicalRecord(struct ncp_server *server,
 106                         const char *file_id,
 107                         __u32 offset, __u32 length);
 108 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 109
 110 int
 111 ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32,
 112                  __u32* volume, __le32* dirent, __le32* dosdirent);
 113 int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle);
 114 int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle);
 115
 116 int ncp_create_new(struct inode *dir, struct dentry *dentry,
 117                           umode_t mode, dev_t rdev, __le32 attributes);
 118
 119 static 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
 130 int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *,
 131                                 const unsigned char *, unsigned int, int);
 132 int 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
 146 int ncp__io2vol(unsigned char *, unsigned int *,
 147                                 const unsigned char *, unsigned int, int);
 148 int 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
 158 static 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
 175 static inline void
 176 ncp_age_dentry(struct ncp_server* server, struct dentry* dentry)
 177 {
 178         dentry->d_time = jiffies - NCP_MAX_AGE(server);
 179 }
 180
 181 static inline void
 182 ncp_new_dentry(struct dentry* dentry)
 183 {
 184         dentry->d_time = jiffies;
 185 }
 186
 187 static inline void
 188 ncp_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
 209 static inline void
 210 ncp_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
 227 struct 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 *)))
 235 union 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
 246 struct 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 */