fs/ufs/util.h

   1 /*
   2  *  linux/fs/ufs/util.h
   3  *
   4  * Copyright (C) 1998
   5  * Daniel Pirkl <daniel.pirkl@email.cz>
   6  * Charles University, Faculty of Mathematics and Physics
   7  */
   8
   9 #include <linux/buffer_head.h>
  10 #include <linux/fs.h>
  11 #include "swab.h"
  12
  13
  14 /*
  15  * some useful macros
  16  */
  17 #define in_range(b,first,len)   ((b)>=(first)&&(b)<(first)+(len))
  18
  19 /*
  20  * macros used for retyping
  21  */
  22 #define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
  23 #define USPI_UBH ((struct ufs_buffer_head *)uspi)
  24
  25
  26
  27 /*
  28  * macros used for accessing structures
  29  */
  30 static inline s32
  31 ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
  32                  struct ufs_super_block_third *usb3)
  33 {
  34         switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  35         case UFS_ST_SUN:
  36                 return fs32_to_cpu(sb, usb3->fs_u2.fs_sun.fs_state);
  37         case UFS_ST_SUNx86:
  38                 return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
  39         case UFS_ST_44BSD:
  40         default:
  41                 return fs32_to_cpu(sb, usb3->fs_u2.fs_44.fs_state);
  42         }
  43 }
  44
  45 static inline void
  46 ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
  47                  struct ufs_super_block_third *usb3, s32 value)
  48 {
  49         switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  50         case UFS_ST_SUN:
  51                 usb3->fs_u2.fs_sun.fs_state = cpu_to_fs32(sb, value);
  52                 break;
  53         case UFS_ST_SUNx86:
  54                 usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
  55                 break;
  56         case UFS_ST_44BSD:
  57                 usb3->fs_u2.fs_44.fs_state = cpu_to_fs32(sb, value);
  58                 break;
  59         }
  60 }
  61
  62 static inline u32
  63 ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
  64                   struct ufs_super_block_third *usb3)
  65 {
  66         if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
  67                 return fs32_to_cpu(sb, usb3->fs_u2.fs_sunx86.fs_npsect);
  68         else
  69                 return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
  70 }
  71
  72 static inline u64
  73 ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
  74 {
  75         __fs64 tmp;
  76
  77         switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  78         case UFS_ST_SUN:
  79                 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
  80                 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
  81                 break;
  82         case UFS_ST_SUNx86:
  83                 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
  84                 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
  85                 break;
  86         case UFS_ST_44BSD:
  87                 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
  88                 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qbmask[1];
  89                 break;
  90         }
  91
  92         return fs64_to_cpu(sb, tmp);
  93 }
  94
  95 static inline u64
  96 ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
  97 {
  98         __fs64 tmp;
  99
 100         switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
 101         case UFS_ST_SUN:
 102                 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
 103                 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
 104                 break;
 105         case UFS_ST_SUNx86:
 106                 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
 107                 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
 108                 break;
 109         case UFS_ST_44BSD:
 110                 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
 111                 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qfmask[1];
 112                 break;
 113         }
 114
 115         return fs64_to_cpu(sb, tmp);
 116 }
 117
 118 static inline u16
 119 ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
 120 {
 121         if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
 122                 return fs16_to_cpu(sb, de->d_u.d_namlen);
 123         else
 124                 return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
 125 }
 126
 127 static inline void
 128 ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
 129 {
 130         if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
 131                 de->d_u.d_namlen = cpu_to_fs16(sb, value);
 132         else
 133                 de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
 134 }
 135
 136 static inline void
 137 ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
 138 {
 139         if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
 140                 return;
 141
 142         /*
 143          * TODO turn this into a table lookup
 144          */
 145         switch (mode & S_IFMT) {
 146         case S_IFSOCK:
 147                 de->d_u.d_44.d_type = DT_SOCK;
 148                 break;
 149         case S_IFLNK:
 150                 de->d_u.d_44.d_type = DT_LNK;
 151                 break;
 152         case S_IFREG:
 153                 de->d_u.d_44.d_type = DT_REG;
 154                 break;
 155         case S_IFBLK:
 156                 de->d_u.d_44.d_type = DT_BLK;
 157                 break;
 158         case S_IFDIR:
 159                 de->d_u.d_44.d_type = DT_DIR;
 160                 break;
 161         case S_IFCHR:
 162                 de->d_u.d_44.d_type = DT_CHR;
 163                 break;
 164         case S_IFIFO:
 165                 de->d_u.d_44.d_type = DT_FIFO;
 166                 break;
 167         default:
 168                 de->d_u.d_44.d_type = DT_UNKNOWN;
 169         }
 170 }
 171
 172 static inline u32
 173 ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
 174 {
 175         switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
 176         case UFS_UID_EFT:
 177                 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
 178         case UFS_UID_44BSD:
 179                 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
 180         default:
 181                 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
 182         }
 183 }
 184
 185 static inline void
 186 ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
 187 {
 188         switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
 189         case UFS_UID_EFT:
 190                 inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
 191                 break;
 192         case UFS_UID_44BSD:
 193                 inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
 194                 break;
 195         }
 196         inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
 197 }
 198
 199 static inline u32
 200 ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
 201 {
 202         switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
 203         case UFS_UID_EFT:
 204                 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
 205         case UFS_UID_44BSD:
 206                 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
 207         default:
 208                 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
 209         }
 210 }
 211
 212 static inline void
 213 ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
 214 {
 215         switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
 216         case UFS_UID_EFT:
 217                 inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
 218                 break;
 219         case UFS_UID_44BSD:
 220                 inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
 221                 break;
 222         }
 223         inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
 224 }
 225
 226 extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
 227 extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
 228
 229 /*
 230  * These functions manipulate ufs buffers
 231  */
 232 #define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)
 233 extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
 234 extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
 235 extern void ubh_brelse (struct ufs_buffer_head *);
 236 extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
 237 extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
 238 extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
 239 extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
 240 extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
 241 extern unsigned ubh_max_bcount (struct ufs_buffer_head *);
 242 extern void ubh_bforget (struct ufs_buffer_head *);
 243 extern int  ubh_buffer_dirty (struct ufs_buffer_head *);
 244 #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
 245 extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
 246 #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
 247 extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
 248
 249
 250
 251 /*
 252  * macros and inline function to get important structures from ufs_sb_private_info
 253  */
 254
 255 static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
 256                                    unsigned int offset)
 257 {
 258         unsigned int index;
 259
 260         index = offset >> uspi->s_fshift;
 261         offset &= ~uspi->s_fmask;
 262         return uspi->s_ubh.bh[index]->b_data + offset;
 263 }
 264
 265 #define ubh_get_usb_first(uspi) \
 266         ((struct ufs_super_block_first *)get_usb_offset((uspi), 0))
 267
 268 #define ubh_get_usb_second(uspi) \
 269         ((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))
 270
 271 #define ubh_get_usb_third(uspi) \
 272         ((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))
 273
 274
 275 #define ubh_get_ucg(ubh) \
 276         ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
 277
 278
 279 /*
 280  * Extract byte from ufs_buffer_head
 281  * Extract the bits for a block from a map inside ufs_buffer_head
 282  */
 283 #define ubh_get_addr8(ubh,begin) \
 284         ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
 285         ((begin) & ~uspi->s_fmask))
 286
 287 #define ubh_get_addr16(ubh,begin) \
 288         (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
 289         ((begin) & (uspi->fsize>>1) - 1)))
 290
 291 #define ubh_get_addr32(ubh,begin) \
 292         (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
 293         ((begin) & ((uspi->s_fsize>>2) - 1)))
 294
 295 #define ubh_get_addr ubh_get_addr8
 296
 297 #define ubh_blkmap(ubh,begin,bit) \
 298         ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
 299
 300
 301 /*
 302  * Macros for access to superblock array structures
 303  */
 304 #define ubh_postbl(ubh,cylno,i) \
 305         ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
 306         ? (*(__s16*)(ubh_get_addr(ubh, \
 307         (unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
 308         + (((cylno) * 16 + (i)) << 1) ) )) \
 309         : (*(__s16*)(ubh_get_addr(ubh, \
 310         uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))
 311
 312 #define ubh_rotbl(ubh,i) \
 313         ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
 314         ? (*(__u8*)(ubh_get_addr(ubh, \
 315         (unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
 316         : (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))
 317
 318 /*
 319  * Determine the number of available frags given a
 320  * percentage to hold in reserve.
 321  */
 322 #define ufs_freespace(usb, percentreserved) \
 323         (ufs_blkstofrags(fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nbfree)) + \
 324         fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
 325
 326 /*
 327  * Macros to access cylinder group array structures
 328  */
 329 #define ubh_cg_blktot(ucpi,cylno) \
 330         (*((__fs32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
 331
 332 #define ubh_cg_blks(ucpi,cylno,rpos) \
 333         (*((__fs16*)ubh_get_addr(UCPI_UBH, \
 334         (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
 335
 336 /*
 337  * Bitmap operations
 338  * These functions work like classical bitmap operations.
 339  * The difference is that we don't have the whole bitmap
 340  * in one contiguous chunk of memory, but in several buffers.
 341  * The parameters of each function are super_block, ufs_buffer_head and
 342  * position of the beginning of the bitmap.
 343  */
 344 #define ubh_setbit(ubh,begin,bit) \
 345         (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
 346
 347 #define ubh_clrbit(ubh,begin,bit) \
 348         (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
 349
 350 #define ubh_isset(ubh,begin,bit) \
 351         (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
 352
 353 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
 354
 355 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
 356
 357 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
 358 static inline unsigned _ubh_find_next_zero_bit_(
 359         struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 360         unsigned begin, unsigned size, unsigned offset)
 361 {
 362         unsigned base, count, pos;
 363
 364         size -= offset;
 365         begin <<= 3;
 366         offset += begin;
 367         base = offset >> uspi->s_bpfshift;
 368         offset &= uspi->s_bpfmask;
 369         for (;;) {
 370                 count = min_t(unsigned int, size + offset, uspi->s_bpf);
 371                 size -= count - offset;
 372                 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
 373                 if (pos < count || !size)
 374                         break;
 375                 base++;
 376                 offset = 0;
 377         }
 378         return (base << uspi->s_bpfshift) + pos - begin;
 379 }
 380
 381 static inline unsigned find_last_zero_bit (unsigned char * bitmap,
 382         unsigned size, unsigned offset)
 383 {
 384         unsigned bit, i;
 385         unsigned char * mapp;
 386         unsigned char map;
 387
 388         mapp = bitmap + (size >> 3);
 389         map = *mapp--;
 390         bit = 1 << (size & 7);
 391         for (i = size; i > offset; i--) {
 392                 if ((map & bit) == 0)
 393                         break;
 394                 if ((i & 7) != 0) {
 395                         bit >>= 1;
 396                 } else {
 397                         map = *mapp--;
 398                         bit = 1 << 7;
 399                 }
 400         }
 401         return i;
 402 }
 403
 404 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
 405 static inline unsigned _ubh_find_last_zero_bit_(
 406         struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 407         unsigned begin, unsigned start, unsigned end)
 408 {
 409         unsigned base, count, pos, size;
 410
 411         size = start - end;
 412         begin <<= 3;
 413         start += begin;
 414         base = start >> uspi->s_bpfshift;
 415         start &= uspi->s_bpfmask;
 416         for (;;) {
 417                 count = min_t(unsigned int,
 418                             size + (uspi->s_bpf - start), uspi->s_bpf)
 419                         - (uspi->s_bpf - start);
 420                 size -= count;
 421                 pos = find_last_zero_bit (ubh->bh[base]->b_data,
 422                         start, start - count);
 423                 if (pos > start - count || !size)
 424                         break;
 425                 base--;
 426                 start = uspi->s_bpf;
 427         }
 428         return (base << uspi->s_bpfshift) + pos - begin;
 429 }
 430
 431 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
 432
 433 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
 434 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
 435         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 436 {
 437         switch (uspi->s_fpb) {
 438         case 8:
 439                 return (*ubh_get_addr (ubh, begin + block) == 0xff);
 440         case 4:
 441                 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
 442         case 2:
 443                 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
 444         case 1:
 445                 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
 446         }
 447         return 0;
 448 }
 449
 450 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
 451 static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
 452         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 453 {
 454         switch (uspi->s_fpb) {
 455         case 8:
 456                 *ubh_get_addr (ubh, begin + block) = 0x00;
 457                 return;
 458         case 4:
 459                 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
 460                 return;
 461         case 2:
 462                 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
 463                 return;
 464         case 1:
 465                 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
 466                 return;
 467         }
 468 }
 469
 470 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
 471 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
 472         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 473 {
 474         switch (uspi->s_fpb) {
 475         case 8:
 476                 *ubh_get_addr(ubh, begin + block) = 0xff;
 477                 return;
 478         case 4:
 479                 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
 480                 return;
 481         case 2:
 482                 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
 483                 return;
 484         case 1:
 485                 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
 486                 return;
 487         }
 488 }
 489
 490 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
 491         __fs32 * fraglist, int cnt)
 492 {
 493         struct ufs_sb_private_info * uspi;
 494         unsigned fragsize, pos;
 495
 496         uspi = UFS_SB(sb)->s_uspi;
 497
 498         fragsize = 0;
 499         for (pos = 0; pos < uspi->s_fpb; pos++) {
 500                 if (blockmap & (1 << pos)) {
 501                         fragsize++;
 502                 }
 503                 else if (fragsize > 0) {
 504                         fs32_add(sb, &fraglist[fragsize], cnt);
 505                         fragsize = 0;
 506                 }
 507         }
 508         if (fragsize > 0 && fragsize < uspi->s_fpb)
 509                 fs32_add(sb, &fraglist[fragsize], cnt);
 510 }
 511
 512 #define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
 513 static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 514         unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
 515 {
 516         unsigned rest, offset;
 517         unsigned char * cp;
 518
 519
 520         offset = begin & ~uspi->s_fmask;
 521         begin >>= uspi->s_fshift;
 522         for (;;) {
 523                 if ((offset + size) < uspi->s_fsize)
 524                         rest = size;
 525                 else
 526                         rest = uspi->s_fsize - offset;
 527                 size -= rest;
 528                 cp = ubh->bh[begin]->b_data + offset;
 529                 while ((table[*cp++] & mask) == 0 && --rest);
 530                 if (rest || !size)
 531                         break;
 532                 begin++;
 533                 offset = 0;
 534         }
 535         return (size + rest);
 536 }