fs/hpfs/hpfs_fn.h

   1 /*
   2  *  linux/fs/hpfs/hpfs_fn.h
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  function headers
   7  */
   8
   9 //#define DBG
  10 //#define DEBUG_LOCKS
  11
  12 #include <linux/fs.h>
  13 #include <linux/hpfs_fs.h>
  14 #include <linux/errno.h>
  15 #include <linux/malloc.h>
  16 #include <linux/kernel.h>
  17 #include <linux/sched.h>
  18 #include <linux/locks.h>
  19 #include <linux/stat.h>
  20 #include <linux/string.h>
  21 #include <asm/bitops.h>
  22 #include <asm/segment.h>
  23 #include <asm/uaccess.h>
  24
  25 #include <stdarg.h>
  26
  27 #include "hpfs.h"
  28
  29 #define memcpy_tofs memcpy
  30 #define memcpy_fromfs memcpy
  31
  32 #define EIOERROR  EIO
  33 #define EFSERROR  EPERM
  34 #define EMEMERROR ENOMEM
  35
  36 #define ANODE_ALLOC_FWD 512
  37 #define FNODE_ALLOC_FWD 0
  38 #define ALLOC_FWD_MIN   16
  39 #define ALLOC_FWD_MAX   512
  40 #define ALLOC_M         1
  41 #define FNODE_RD_AHEAD  16
  42 #define ANODE_RD_AHEAD  16
  43 #define DNODE_RD_AHEAD  4
  44
  45 #define CHKCOND(x,y) if (!(x)) printk y
  46
  47 #ifdef DBG
  48 #define PRINTK(x) printk x
  49 #else
  50 #undef PRINTK
  51 #define PRINTK(x)
  52 #endif
  53
  54 typedef void nonconst; /* What this is for ? */
  55
  56 /*
  57  * local time (HPFS) to GMT (Unix)
  58  */
  59
  60 extern inline time_t local_to_gmt(struct super_block *s, time_t t)
  61 {
  62         extern struct timezone sys_tz;
  63         return t + sys_tz.tz_minuteswest * 60 - (sys_tz.tz_dsttime ? 3600 : 0) +s->s_hpfs_timeshift;
  64 }
  65
  66 extern inline time_t gmt_to_local(struct super_block *s, time_t t)
  67 {
  68         extern struct timezone sys_tz;
  69         return t - sys_tz.tz_minuteswest * 60 + (sys_tz.tz_dsttime ? 3600 : 0) -s->s_hpfs_timeshift;
  70 }
  71
  72 /*
  73  * conv= options
  74  */
  75
  76 #define CONV_BINARY 0                   /* no conversion */
  77 #define CONV_TEXT 1                     /* crlf->newline */
  78 #define CONV_AUTO 2                     /* decide based on file contents */
  79
  80 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
  81
  82 struct quad_buffer_head {
  83         struct buffer_head *bh[4];
  84         void *data;
  85 };
  86
  87 /* The b-tree down pointer from a dir entry */
  88
  89 extern inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
  90 {
  91   CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
  92   return *(dnode_secno *) ((void *) de + de->length - 4);
  93 }
  94
  95 /* The first dir entry in a dnode */
  96
  97 extern inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
  98 {
  99   return (void *) dnode->dirent;
 100 }
 101
 102 /* The end+1 of the dir entries */
 103
 104 extern inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
 105 {
 106   CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
 107   return (void *) dnode + dnode->first_free;
 108 }
 109
 110 /* The dir entry after dir entry de */
 111
 112 extern inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
 113 {
 114   CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
 115   return (void *) de + de->length;
 116 }
 117
 118 extern inline struct extended_attribute *fnode_ea(struct fnode *fnode)
 119 {
 120         return (struct extended_attribute *)((char *)fnode + fnode->ea_offs);
 121 }
 122
 123 extern inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
 124 {
 125         return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->ea_size_s);
 126 }
 127
 128 extern inline struct extended_attribute *next_ea(struct extended_attribute *ea)
 129 {
 130         return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
 131 }
 132
 133 extern inline secno ea_sec(struct extended_attribute *ea)
 134 {
 135         return *(secno *)((char *)ea + 9 + ea->namelen);
 136 }
 137
 138 extern inline secno ea_len(struct extended_attribute *ea)
 139 {
 140         return *(secno *)((char *)ea + 5 + ea->namelen);
 141 }
 142
 143 extern inline char *ea_data(struct extended_attribute *ea)
 144 {
 145         return (char *)((char *)ea + 5 + ea->namelen);
 146 }
 147
 148 extern inline unsigned de_size(int namelen, secno down_ptr)
 149 {
 150         return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
 151 }
 152
 153 extern inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
 154 {
 155         int a = dst->down;
 156         int n = dst->not_8x3;
 157         if (!dst || !src) return;
 158         memcpy((char *)dst + 2, (char *)src + 2, 28);
 159         dst->down = a;
 160         dst->not_8x3 = n;
 161 }
 162
 163 extern inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
 164 {
 165         int i;
 166         if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
 167         if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
 168         for (i = 1; i < n; i++)
 169                 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
 170                         return i + 1;
 171         return 0;
 172 }
 173
 174 /* alloc.c */
 175
 176 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
 177 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
 178 int hpfs_alloc_if_possible_nolock(struct super_block *, secno);
 179 int hpfs_alloc_if_possible(struct super_block *, secno);
 180 void hpfs_free_sectors(struct super_block *, secno, unsigned);
 181 int hpfs_check_free_dnodes(struct super_block *, int);
 182 void hpfs_free_dnode(struct super_block *, secno);
 183 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
 184 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
 185 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
 186
 187 /* anode.c */
 188
 189 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
 190 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
 191 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
 192 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
 193 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
 194 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
 195 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
 196 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
 197
 198 /* buffer.c */
 199
 200 void hpfs_lock_creation(struct super_block *);
 201 void hpfs_unlock_creation(struct super_block *);
 202 void hpfs_lock_iget(struct super_block *, int);
 203 void hpfs_unlock_iget(struct super_block *);
 204 void hpfs_lock_inode(struct inode *);
 205 void hpfs_unlock_inode(struct inode *);
 206 void hpfs_lock_2inodes(struct inode *, struct inode *);
 207 void hpfs_unlock_2inodes(struct inode *, struct inode *);
 208 void hpfs_lock_3inodes(struct inode *, struct inode *, struct inode *);
 209 void hpfs_unlock_3inodes(struct inode *, struct inode *, struct inode *);
 210 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
 211 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
 212 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
 213 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
 214 void hpfs_brelse4(struct quad_buffer_head *);
 215 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
 216
 217 /* dentry.c */
 218
 219 void hpfs_set_dentry_operations(struct dentry *);
 220
 221 /* dir.c */
 222
 223 int hpfs_dir_read(struct file *, char *, size_t, loff_t *);
 224 int hpfs_dir_release(struct inode *, struct file *);
 225 int hpfs_readdir(struct file *, void *, filldir_t);
 226 struct dentry *hpfs_lookup(struct inode *, struct dentry *);
 227
 228 /* dnode.c */
 229
 230 void hpfs_add_pos(struct inode *, loff_t *);
 231 void hpfs_del_pos(struct inode *, loff_t *);
 232 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
 233 void hpfs_delete_de(struct super_block *, struct dnode *, struct hpfs_dirent *);
 234 int hpfs_add_to_dnode(struct inode *, dnode_secno, unsigned char *, unsigned, struct hpfs_dirent *, dnode_secno);
 235 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
 236 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
 237 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
 238 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
 239 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
 240 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *, int *depth);
 241 void hpfs_remove_dtree(struct super_block *, dnode_secno);
 242 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
 243
 244 /* ea.c */
 245
 246 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
 247 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
 248 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
 249
 250 /* file.c */
 251
 252 int hpfs_file_release(struct inode *, struct file *);
 253 int hpfs_open(struct inode *, struct file *);
 254 int hpfs_file_fsync(struct file *, struct dentry *);
 255 secno hpfs_bmap(struct inode *, unsigned);
 256 void hpfs_truncate(struct inode *);
 257 ssize_t hpfs_file_read(struct file *, char *, size_t, loff_t *);
 258 ssize_t hpfs_file_write(struct file *, const char *, size_t, loff_t *);
 259
 260 /* inode.c */
 261
 262 void hpfs_read_inode(struct inode *);
 263 void hpfs_write_inode_ea(struct inode *, struct fnode *);
 264 void hpfs_write_inode(struct inode *);
 265 void hpfs_write_inode_nolock(struct inode *);
 266 int hpfs_notify_change(struct dentry *, struct iattr *);
 267 void hpfs_write_if_changed(struct inode *);
 268 void hpfs_delete_inode(struct inode *);
 269
 270 /* map.c */
 271
 272 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
 273 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
 274 char *hpfs_load_code_page(struct super_block *, secno);
 275 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
 276 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
 277 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
 278 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
 279 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
 280
 281 /* mmap.c */
 282
 283 int hpfs_mmap(struct file *, struct vm_area_struct *);
 284
 285 /* name.c */
 286
 287 unsigned char hpfs_upcase(unsigned char *, unsigned char);
 288 int hpfs_chk_name(unsigned char *, unsigned);
 289 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
 290 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
 291 int hpfs_is_name_long(unsigned char *, unsigned);
 292 void hpfs_adjust_length(unsigned char *, unsigned *);
 293 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
 294
 295 /* namei.c */
 296
 297 int hpfs_mkdir(struct inode *, struct dentry *, int);
 298 int hpfs_create(struct inode *, struct dentry *, int);
 299 int hpfs_mknod(struct inode *, struct dentry *, int, int);
 300 int hpfs_symlink(struct inode *, struct dentry *, const char *);
 301 int hpfs_unlink(struct inode *, struct dentry *);
 302 int hpfs_rmdir(struct inode *, struct dentry *);
 303 int hpfs_readlink(struct dentry *, char *, int);
 304 struct dentry *hpfs_follow_link(struct dentry *, struct dentry *, unsigned int);
 305 int hpfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 306
 307 /* super.c */
 308
 309 void hpfs_error(struct super_block *, char *, ...);
 310 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
 311 int hpfs_remount_fs(struct super_block *, int *, char *);
 312 void hpfs_put_super(struct super_block *);
 313 int hpfs_statfs(struct super_block *, struct statfs *, int);
 314 struct super_block *hpfs_read_super(struct super_block *, void *, int);