fs/ncpfs/ncplib_kernel.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  ncplib_kernel.h
   4  *
   5  *  Copyright (C) 1995, 1996 by Volker Lendecke
   6  *  Modified for big endian by J.F. Chadima and David S. Miller
   7  *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
   8  *  Modified 1998, 1999 Wolfram Pienkoss for NLS
   9  *  Modified 1999 Wolfram Pienkoss for directory caching
  10  *
  11  */
  12
  13 #ifndef _NCPLIB_H
  14 #define _NCPLIB_H
  15
  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 <linux/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 #define NCP_MIN_SYMLINK_SIZE    8
  37 #define NCP_MAX_SYMLINK_SIZE    512
  38
  39 #define NCP_BLOCK_SHIFT         9
  40 #define NCP_BLOCK_SIZE          (1 << (NCP_BLOCK_SHIFT))
  41
  42 int ncp_negotiate_buffersize(struct ncp_server *, int, int *);
  43 int ncp_negotiate_size_and_options(struct ncp_server *server, int size,
  44                           int options, int *ret_size, int *ret_options);
  45
  46 int ncp_get_volume_info_with_number(struct ncp_server* server, int n,
  47                                     struct ncp_volume_info *target);
  48
  49 int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle,
  50                            struct ncp_volume_info* target);
  51
  52 int ncp_close_file(struct ncp_server *, const char *);
  53 static inline int ncp_read_bounce_size(__u32 size) {
  54         return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
  55 };
  56 int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16,
  57                 struct iov_iter *, int *, void *bounce, __u32 bouncelen);
  58 int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16,
  59                 char *, int *);
  60 int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,
  61                 const char *, int *);
  62
  63 static inline void ncp_inode_close(struct inode *inode) {
  64         atomic_dec(&NCP_FINFO(inode)->opened);
  65 }
  66
  67 void ncp_extract_file_info(const void* src, struct nw_info_struct* target);
  68 int ncp_obtain_info(struct ncp_server *server, struct inode *, const char *,
  69                 struct nw_info_struct *target);
  70 int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target);
  71 int ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns);
  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 *, const char *);
  84 int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const 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 *, const char *, struct inode *, const 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                           umode_t 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(sb)        (NCP_SBP(sb)->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(sb)        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(const struct nls_table *t,
 160                 const unsigned char *s1, 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)     atomic_read(&(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 - NCP_MAX_AGE(server);
 180 }
 181
 182 static inline void
 183 ncp_new_dentry(struct dentry* dentry)
 184 {
 185         dentry->d_time = jiffies;
 186 }
 187
 188 struct ncp_cache_head {
 189         time_t          mtime;
 190         unsigned long   time;   /* cache age */
 191         unsigned long   end;    /* last valid fpos in cache */
 192         int             eof;
 193 };
 194
 195 #define NCP_DIRCACHE_SIZE       ((int)(PAGE_SIZE/sizeof(struct dentry *)))
 196 union ncp_dir_cache {
 197         struct ncp_cache_head   head;
 198         struct dentry           *dentry[NCP_DIRCACHE_SIZE];
 199 };
 200
 201 #define NCP_FIRSTCACHE_SIZE     ((int)((NCP_DIRCACHE_SIZE * \
 202         sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \
 203         sizeof(struct dentry *)))
 204
 205 #define NCP_DIRCACHE_START      (NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE)
 206
 207 struct ncp_cache_control {
 208         struct  ncp_cache_head          head;
 209         struct  page                    *page;
 210         union   ncp_dir_cache           *cache;
 211         unsigned long                   fpos, ofs;
 212         int                             filled, valid, idx;
 213 };
 214
 215 #endif /* _NCPLIB_H */