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 #include <linux/smp_lock.h>
  25
  26 #include <stdarg.h>
  27
  28 #include "hpfs.h"
  29
  30 #define memcpy_tofs memcpy
  31 #define memcpy_fromfs memcpy
  32
  33 #define EIOERROR  EIO
  34 #define EFSERROR  EPERM
  35 #define EMEMERROR ENOMEM
  36
  37 #define ANODE_ALLOC_FWD 512
  38 #define FNODE_ALLOC_FWD 0
  39 #define ALLOC_FWD_MIN   16
  40 #define ALLOC_FWD_MAX   128
  41 #define ALLOC_M         1
  42 #define FNODE_RD_AHEAD  16
  43 #define ANODE_RD_AHEAD  16
  44 #define DNODE_RD_AHEAD  4
  45
  46 #define FREE_DNODES_ADD 58
  47 #define FREE_DNODES_DEL 29
  48
  49 #define CHKCOND(x,y) if (!(x)) printk y
  50
  51 #ifdef DBG
  52 #define PRINTK(x) printk x
  53 #else
  54 #undef PRINTK
  55 #define PRINTK(x)
  56 #endif
  57
  58 typedef void nonconst; /* What this is for ? */
  59
  60 /*
  61  * local time (HPFS) to GMT (Unix)
  62  */
  63
  64 extern inline time_t local_to_gmt(struct super_block *s, time_t t)
  65 {
  66         extern struct timezone sys_tz;
  67         return t + sys_tz.tz_minuteswest * 60 + s->s_hpfs_timeshift;
  68 }
  69
  70 extern inline time_t gmt_to_local(struct super_block *s, time_t t)
  71 {
  72         extern struct timezone sys_tz;
  73         return t - sys_tz.tz_minuteswest * 60 - s->s_hpfs_timeshift;
  74 }
  75
  76 /*
  77  * conv= options
  78  */
  79
  80 #define CONV_BINARY 0                   /* no conversion */
  81 #define CONV_TEXT 1                     /* crlf->newline */
  82 #define CONV_AUTO 2                     /* decide based on file contents */
  83
  84 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
  85
  86 struct quad_buffer_head {
  87         struct buffer_head *bh[4];
  88         void *data;
  89 };
  90
  91 /* The b-tree down pointer from a dir entry */
  92
  93 extern inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
  94 {
  95   CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
  96   return *(dnode_secno *) ((void *) de + de->length - 4);
  97 }
  98
  99 /* The first dir entry in a dnode */
 100
 101 extern inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
 102 {
 103   return (void *) dnode->dirent;
 104 }
 105
 106 /* The end+1 of the dir entries */
 107
 108 extern inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
 109 {
 110   CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
 111   return (void *) dnode + dnode->first_free;
 112 }
 113
 114 /* The dir entry after dir entry de */
 115
 116 extern inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
 117 {
 118   CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
 119   return (void *) de + de->length;
 120 }
 121
 122 extern inline struct extended_attribute *fnode_ea(struct fnode *fnode)
 123 {
 124         return (struct extended_attribute *)((char *)fnode + fnode->ea_offs);
 125 }
 126
 127 extern inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
 128 {
 129         return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->ea_size_s);
 130 }
 131
 132 extern inline struct extended_attribute *next_ea(struct extended_attribute *ea)
 133 {
 134         return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
 135 }
 136
 137 extern inline secno ea_sec(struct extended_attribute *ea)
 138 {
 139         return *(secno *)((char *)ea + 9 + ea->namelen);
 140 }
 141
 142 extern inline secno ea_len(struct extended_attribute *ea)
 143 {
 144         return *(secno *)((char *)ea + 5 + ea->namelen);
 145 }
 146
 147 extern inline char *ea_data(struct extended_attribute *ea)
 148 {
 149         return (char *)((char *)ea + 5 + ea->namelen);
 150 }
 151
 152 extern inline unsigned de_size(int namelen, secno down_ptr)
 153 {
 154         return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
 155 }
 156
 157 extern inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
 158 {
 159         int a = dst->down;
 160         int n = dst->not_8x3;
 161         if (!dst || !src) return;
 162         memcpy((char *)dst + 2, (char *)src + 2, 28);
 163         dst->down = a;
 164         dst->not_8x3 = n;
 165 }
 166
 167 extern inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
 168 {
 169         int i;
 170         if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
 171         if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
 172         for (i = 1; i < n; i++)
 173                 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
 174                         return i + 1;
 175         return 0;
 176 }
 177
 178 /* alloc.c */
 179
 180 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
 181 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
 182 int hpfs_alloc_if_possible_nolock(struct super_block *, secno);
 183 int hpfs_alloc_if_possible(struct super_block *, secno);
 184 void hpfs_free_sectors(struct super_block *, secno, unsigned);
 185 int hpfs_check_free_dnodes(struct super_block *, int);
 186 void hpfs_free_dnode(struct super_block *, secno);
 187 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
 188 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
 189 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
 190
 191 /* anode.c */
 192
 193 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
 194 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
 195 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
 196 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
 197 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
 198 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
 199 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
 200 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
 201
 202 /* buffer.c */
 203
 204 void hpfs_lock_creation(struct super_block *);
 205 void hpfs_unlock_creation(struct super_block *);
 206 void hpfs_lock_iget(struct super_block *, int);
 207 void hpfs_unlock_iget(struct super_block *);
 208 void hpfs_lock_inode(struct inode *);
 209 void hpfs_unlock_inode(struct inode *);
 210 void hpfs_lock_2inodes(struct inode *, struct inode *);
 211 void hpfs_unlock_2inodes(struct inode *, struct inode *);
 212 void hpfs_lock_3inodes(struct inode *, struct inode *, struct inode *);
 213 void hpfs_unlock_3inodes(struct inode *, struct inode *, struct inode *);
 214 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
 215 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
 216 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
 217 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
 218 void hpfs_brelse4(struct quad_buffer_head *);
 219 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
 220
 221 /* dentry.c */
 222
 223 void hpfs_set_dentry_operations(struct dentry *);
 224
 225 /* dir.c */
 226
 227 int hpfs_dir_release(struct inode *, struct file *);
 228 loff_t hpfs_dir_lseek(struct file *, loff_t, int);
 229 int hpfs_readdir(struct file *, void *, filldir_t);
 230 struct dentry *hpfs_lookup(struct inode *, struct dentry *);
 231
 232 /* dnode.c */
 233
 234 void hpfs_add_pos(struct inode *, loff_t *);
 235 void hpfs_del_pos(struct inode *, loff_t *);
 236 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
 237 void hpfs_delete_de(struct super_block *, struct dnode *, struct hpfs_dirent *);
 238 int hpfs_add_to_dnode(struct inode *, dnode_secno, unsigned char *, unsigned, struct hpfs_dirent *, dnode_secno);
 239 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
 240 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
 241 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
 242 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
 243 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
 244 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
 245 void hpfs_remove_dtree(struct super_block *, dnode_secno);
 246 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
 247
 248 /* ea.c */
 249
 250 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
 251 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
 252 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
 253 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
 254
 255 /* file.c */
 256
 257 int hpfs_file_release(struct inode *, struct file *);
 258 int hpfs_open(struct inode *, struct file *);
 259 int hpfs_file_fsync(struct file *, struct dentry *);
 260 secno hpfs_bmap(struct inode *, unsigned);
 261 void hpfs_truncate(struct inode *);
 262 int hpfs_get_block(struct inode *inode, long iblock, struct buffer_head *bh_result, int create);
 263 ssize_t hpfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos);
 264
 265 /* inode.c */
 266
 267 void hpfs_read_inode(struct inode *);
 268 void hpfs_write_inode_ea(struct inode *, struct fnode *);
 269 void hpfs_write_inode(struct inode *);
 270 void hpfs_write_inode_nolock(struct inode *);
 271 int hpfs_notify_change(struct dentry *, struct iattr *);
 272 void hpfs_write_if_changed(struct inode *);
 273 void hpfs_delete_inode(struct inode *);
 274
 275 /* map.c */
 276
 277 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
 278 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
 279 char *hpfs_load_code_page(struct super_block *, secno);
 280 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
 281 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
 282 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
 283 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
 284 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
 285
 286 /* name.c */
 287
 288 unsigned char hpfs_upcase(unsigned char *, unsigned char);
 289 int hpfs_chk_name(unsigned char *, unsigned *);
 290 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
 291 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
 292 int hpfs_is_name_long(unsigned char *, unsigned);
 293 void hpfs_adjust_length(unsigned char *, unsigned *);
 294 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
 295
 296 /* namei.c */
 297
 298 int hpfs_mkdir(struct inode *, struct dentry *, int);
 299 int hpfs_create(struct inode *, struct dentry *, int);
 300 int hpfs_mknod(struct inode *, struct dentry *, int, int);
 301 int hpfs_symlink(struct inode *, struct dentry *, const char *);
 302 int hpfs_unlink(struct inode *, struct dentry *);
 303 int hpfs_rmdir(struct inode *, struct dentry *);
 304 int hpfs_symlink_readpage(struct dentry *, struct page *);
 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 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
 314 int hpfs_statfs(struct super_block *, struct statfs *);
 315
 316 extern struct address_space_operations hpfs_aops;