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/fs.h>
  10 #include "swab.h"
  11
  12
  13 /*
  14  * some useful macros
  15  */
  16 #define in_range(b,first,len)   ((b)>=(first)&&(b)<(first)+(len))
  17 #define howmany(x,y)            (((x)+(y)-1)/(y))
  18 #define min(x,y)                ((x)<(y)?(x):(y))
  19 #define max(x,y)                ((x)>(y)?(x):(y))
  20
  21
  22
  23 /*
  24  * macros used for retyping
  25  */
  26 #define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
  27 #define USPI_UBH ((struct ufs_buffer_head *)uspi)
  28
  29
  30
  31 /*
  32  * macros used for accesing structures
  33  */
  34 #define ufs_get_fs_state(usb3) _ufs_get_fs_state_(usb3,flags,swab)
  35 static inline __s32 _ufs_get_fs_state_(struct ufs_super_block_third * usb3,
  36         unsigned flags, unsigned swab)
  37 {
  38         if ((flags & UFS_ST_MASK) == UFS_ST_SUN)
  39                 return SWAB32((usb3)->fs_u.fs_sun.fs_state);
  40         else
  41                 return SWAB32((usb3)->fs_u.fs_44.fs_state);
  42 }
  43
  44 #define ufs_set_fs_state(usb3,value) _ufs_set_fs_state_(usb3,value,flags,swab)
  45 static inline void _ufs_set_fs_state_(struct ufs_super_block_third * usb3,
  46         __s32 value, unsigned flags, unsigned swab)
  47 {
  48         if ((flags & UFS_ST_MASK) == UFS_ST_SUN)
  49                 (usb3)->fs_u.fs_sun.fs_state = SWAB32(value);
  50         else
  51                 (usb3)->fs_u.fs_44.fs_state = SWAB32(value);
  52 }
  53
  54 #define ufs_get_fs_qbmask(usb3) _ufs_get_fs_qbmask_(usb3,flags,swab)
  55 static inline __u64 _ufs_get_fs_qbmask_(struct ufs_super_block_third * usb3,
  56         unsigned flags, unsigned swab)
  57 {
  58         __u64 tmp;
  59         if ((flags & UFS_ST_MASK) == UFS_ST_SUN) {
  60                 ((u32 *)&tmp)[0] = usb3->fs_u.fs_sun.fs_qbmask[0];
  61                 ((u32 *)&tmp)[1] = usb3->fs_u.fs_sun.fs_qbmask[1];
  62         }
  63         else {
  64                 ((u32 *)&tmp)[0] = usb3->fs_u.fs_44.fs_qbmask[0];
  65                 ((u32 *)&tmp)[1] = usb3->fs_u.fs_44.fs_qbmask[1];
  66         }
  67         return SWAB64(tmp);
  68 }
  69
  70 #define ufs_get_fs_qfmask(usb3) _ufs_get_fs_qfmask_(usb3,flags,swab)
  71 static inline __u64 _ufs_get_fs_qfmask_(struct ufs_super_block_third * usb3,
  72         unsigned flags, unsigned swab)
  73 {
  74         __u64 tmp;
  75         if ((flags & UFS_ST_MASK) == UFS_ST_SUN) {
  76                 ((u32 *)&tmp)[0] = usb3->fs_u.fs_sun.fs_qfmask[0];
  77                 ((u32 *)&tmp)[1] = usb3->fs_u.fs_sun.fs_qfmask[1];
  78         }
  79         else {
  80                 ((u32 *)&tmp)[0] = usb3->fs_u.fs_44.fs_qfmask[0];
  81                 ((u32 *)&tmp)[1] = usb3->fs_u.fs_44.fs_qfmask[1];
  82         }
  83         return SWAB64(tmp);
  84 }
  85
  86 #define ufs_get_de_namlen(de) \
  87         (((flags & UFS_DE_MASK) == UFS_DE_OLD) \
  88         ? SWAB16(de->d_u.d_namlen) \
  89         : de->d_u.d_44.d_namlen)
  90
  91 #define ufs_set_de_namlen(de,value) \
  92         (((flags & UFS_DE_MASK) == UFS_DE_OLD) \
  93         ? (de->d_u.d_namlen = SWAB16(value)) \
  94         : (de->d_u.d_44.d_namlen = value))
  95
  96 #define ufs_set_de_type(de,mode) _ufs_set_de_type_(de,mode,flags,swab)
  97 static inline void _ufs_set_de_type_(struct ufs_dir_entry * de, int mode,
  98         unsigned flags, unsigned swab)
  99 {
 100         if ((flags & UFS_DE_MASK) == UFS_DE_44BSD) {
 101                 switch (mode & S_IFMT) {
 102                         case S_IFSOCK: de->d_u.d_44.d_type = DT_SOCK; break;
 103                         case S_IFLNK: de->d_u.d_44.d_type = DT_LNK; break;
 104                         case S_IFREG: de->d_u.d_44.d_type = DT_REG; break;
 105                         case S_IFBLK: de->d_u.d_44.d_type = DT_BLK; break;
 106                         case S_IFDIR: de->d_u.d_44.d_type = DT_DIR; break;
 107                         case S_IFCHR: de->d_u.d_44.d_type = DT_CHR; break;
 108                         case S_IFIFO: de->d_u.d_44.d_type = DT_FIFO; break;
 109                         default: de->d_u.d_44.d_type = DT_UNKNOWN;
 110                 }
 111         }
 112 }
 113
 114 #define ufs_get_inode_uid(inode) _ufs_get_inode_uid_(inode,flags,swab)
 115 static inline __u32 _ufs_get_inode_uid_(struct ufs_inode * inode,
 116         unsigned flags, unsigned swab)
 117 {
 118         switch (flags & UFS_UID_MASK) {
 119                 case UFS_UID_EFT:
 120                         return SWAB32(inode->ui_u3.ui_sun.ui_uid);
 121                 case UFS_UID_44BSD:
 122                         return SWAB32(inode->ui_u3.ui_44.ui_uid);
 123                 default:
 124                         return SWAB16(inode->ui_u1.oldids.ui_suid);
 125         }
 126 }
 127
 128 #define ufs_set_inode_uid(inode,value) _ufs_set_inode_uid_(inode,value,flags,swab)
 129 static inline void _ufs_set_inode_uid_(struct ufs_inode * inode, __u32 value,
 130         unsigned flags, unsigned swab)
 131 {
 132         inode->ui_u1.oldids.ui_suid = SWAB16(value);
 133         switch (flags & UFS_UID_MASK) {
 134                 case UFS_UID_EFT:
 135                         inode->ui_u3.ui_sun.ui_uid = SWAB32(value);
 136                         break;
 137                 case UFS_UID_44BSD:
 138                         inode->ui_u3.ui_44.ui_uid = SWAB32(value);
 139                         break;
 140         }
 141 }
 142
 143 #define ufs_get_inode_gid(inode) _ufs_get_inode_gid_(inode,flags,swab)
 144 static inline __u32 _ufs_get_inode_gid_(struct ufs_inode * inode,
 145         unsigned flags, unsigned swab)
 146 {
 147         switch (flags & UFS_UID_MASK) {
 148                 case UFS_UID_EFT:
 149                         return SWAB32(inode->ui_u3.ui_sun.ui_gid);
 150                 case UFS_UID_44BSD:
 151                         return SWAB32(inode->ui_u3.ui_44.ui_gid);
 152                 default:
 153                         return SWAB16(inode->ui_u1.oldids.ui_sgid);
 154         }
 155 }
 156
 157 #define ufs_set_inode_gid(inode,value) _ufs_set_inode_gid_(inode,value,flags,swab)
 158 static inline void _ufs_set_inode_gid_(struct ufs_inode * inode, __u32 value,
 159         unsigned flags, unsigned swab)
 160 {
 161         inode->ui_u1.oldids.ui_sgid =  SWAB16(value);
 162         switch (flags & UFS_UID_MASK) {
 163                 case UFS_UID_EFT:
 164                         inode->ui_u3.ui_sun.ui_gid = SWAB32(value);
 165                         break;
 166                 case UFS_UID_44BSD:
 167                         inode->ui_u3.ui_44.ui_gid = SWAB32(value);
 168                         break;
 169         }
 170 }
 171
 172
 173
 174 /*
 175  * These functions manipulate ufs buffers
 176  */
 177 #define ubh_bread(dev,fragment,size) _ubh_bread_(uspi,dev,fragment,size)
 178 extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, kdev_t, unsigned, unsigned);
 179 extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, kdev_t, unsigned, unsigned);
 180 extern void ubh_brelse (struct ufs_buffer_head *);
 181 extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
 182 extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *, int);
 183 extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
 184 extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
 185 extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
 186 extern unsigned ubh_max_bcount (struct ufs_buffer_head *);
 187 extern void ubh_bforget (struct ufs_buffer_head *);
 188 extern int  ubh_buffer_dirty (struct ufs_buffer_head *);
 189 #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
 190 extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
 191 #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
 192 extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
 193
 194
 195
 196 /*
 197  * macros to get important structures from ufs_buffer_head
 198  */
 199 #define ubh_get_usb_first(ubh) \
 200         ((struct ufs_super_block_first *)((ubh)->bh[0]->b_data))
 201
 202 #define ubh_get_usb_second(ubh) \
 203         ((struct ufs_super_block_second *)(ubh)-> \
 204         bh[UFS_SECTOR_SIZE >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE & ~uspi->s_fmask))
 205
 206 #define ubh_get_usb_third(ubh) \
 207         ((struct ufs_super_block_third *)((ubh)-> \
 208         bh[UFS_SECTOR_SIZE*2 >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE*2 & ~uspi->s_fmask)))
 209
 210 #define ubh_get_ucg(ubh) \
 211         ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
 212
 213
 214 /*
 215  * Extract byte from ufs_buffer_head
 216  * Extract the bits for a block from a map inside ufs_buffer_head
 217  */
 218 #define ubh_get_addr8(ubh,begin) \
 219         ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
 220         ((begin) & ~uspi->s_fmask))
 221
 222 #define ubh_get_addr16(ubh,begin) \
 223         (((u16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
 224         ((begin) & (uspi->fsize>>1) - 1)))
 225
 226 #define ubh_get_addr32(ubh,begin) \
 227         (((u32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
 228         ((begin) & ((uspi->s_fsize>>2) - 1)))
 229
 230 #define ubh_get_addr ubh_get_addr8
 231
 232 #define ubh_blkmap(ubh,begin,bit) \
 233         ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
 234
 235
 236 /*
 237  * Macros for access to superblock array structures
 238  */
 239 #define ubh_postbl(ubh,cylno,i) \
 240         ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
 241         ? (*(__s16*)(ubh_get_addr(ubh, \
 242         (unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
 243         + (((cylno) * 16 + (i)) << 1) ) )) \
 244         : (*(__s16*)(ubh_get_addr(ubh, \
 245         uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))
 246
 247 #define ubh_rotbl(ubh,i) \
 248         ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
 249         ? (*(__u8*)(ubh_get_addr(ubh, \
 250         (unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
 251         : (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))
 252
 253 /*
 254  * Determine the number of available frags given a
 255  * percentage to hold in reserve.
 256  */
 257 #define ufs_freespace(usb, percentreserved) \
 258         (ufs_blkstofrags(SWAB32((usb)->fs_cstotal.cs_nbfree)) + \
 259         SWAB32((usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
 260
 261 /*
 262  * Macros to access cylinder group array structures
 263  */
 264 #define ubh_cg_blktot(ucpi,cylno) \
 265         (*((__u32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
 266
 267 #define ubh_cg_blks(ucpi,cylno,rpos) \
 268         (*((__u16*)ubh_get_addr(UCPI_UBH, \
 269         (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
 270
 271 /*
 272  * Bitmap operations
 273  * These functions work like classical bitmap operations.
 274  * The difference is that we don't have the whole bitmap
 275  * in one contiguous chunk of memory, but in several buffers.
 276  * The parameters of each function are super_block, ufs_buffer_head and
 277  * position of the beginning of the bitmap.
 278  */
 279 #define ubh_setbit(ubh,begin,bit) \
 280         (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
 281
 282 #define ubh_clrbit(ubh,begin,bit) \
 283         (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
 284
 285 #define ubh_isset(ubh,begin,bit) \
 286         (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
 287
 288 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
 289
 290 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
 291
 292 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
 293 static inline unsigned _ubh_find_next_zero_bit_(
 294         struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 295         unsigned begin, unsigned size, unsigned offset)
 296 {
 297         unsigned base, count, pos;
 298
 299         size -= offset;
 300         begin <<= 3;
 301         offset += begin;
 302         base = offset >> uspi->s_bpfshift;
 303         offset &= uspi->s_bpfmask;
 304         for (;;) {
 305                 count = min (size + offset, uspi->s_bpf);
 306                 size -= count - offset;
 307                 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
 308                 if (pos < count || !size)
 309                         break;
 310                 base++;
 311                 offset = 0;
 312         }
 313         return (base << uspi->s_bpfshift) + pos - begin;
 314 }
 315
 316 static inline unsigned find_last_zero_bit (unsigned char * bitmap,
 317         unsigned size, unsigned offset)
 318 {
 319         unsigned bit, i;
 320         unsigned char * mapp;
 321         unsigned char map;
 322
 323         mapp = bitmap + (size >> 3);
 324         map = *mapp--;
 325         bit = 1 << (size & 7);
 326         for (i = size; i > offset; i--) {
 327                 if ((map & bit) == 0)
 328                         break;
 329                 if ((i & 7) != 0) {
 330                         bit >>= 1;
 331                 } else {
 332                         map = *mapp--;
 333                         bit = 1 << 7;
 334                 }
 335         }
 336         return i;
 337 }
 338
 339 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
 340 static inline unsigned _ubh_find_last_zero_bit_(
 341         struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 342         unsigned begin, unsigned start, unsigned end)
 343 {
 344         unsigned base, count, pos, size;
 345
 346         size = start - end;
 347         begin <<= 3;
 348         start += begin;
 349         base = start >> uspi->s_bpfshift;
 350         start &= uspi->s_bpfmask;
 351         for (;;) {
 352                 count = min (size + (uspi->s_bpf - start), uspi->s_bpf)
 353                         - (uspi->s_bpf - start);
 354                 size -= count;
 355                 pos = find_last_zero_bit (ubh->bh[base]->b_data,
 356                         start, start - count);
 357                 if (pos > start - count || !size)
 358                         break;
 359                 base--;
 360                 start = uspi->s_bpf;
 361         }
 362         return (base << uspi->s_bpfshift) + pos - begin;
 363 }
 364
 365 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
 366
 367 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
 368 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
 369         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 370 {
 371         switch (uspi->s_fpb) {
 372         case 8:
 373                 return (*ubh_get_addr (ubh, begin + block) == 0xff);
 374         case 4:
 375                 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
 376         case 2:
 377                 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
 378         case 1:
 379                 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
 380         }
 381         return 0;
 382 }
 383
 384 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
 385 static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
 386         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 387 {
 388         switch (uspi->s_fpb) {
 389         case 8:
 390                 *ubh_get_addr (ubh, begin + block) = 0x00;
 391                 return;
 392         case 4:
 393                 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
 394                 return;
 395         case 2:
 396                 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
 397                 return;
 398         case 1:
 399                 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
 400                 return;
 401         }
 402 }
 403
 404 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
 405 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
 406         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 407 {
 408         switch (uspi->s_fpb) {
 409         case 8:
 410                 *ubh_get_addr(ubh, begin + block) = 0xff;
 411                 return;
 412         case 4:
 413                 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
 414                 return;
 415         case 2:
 416                 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
 417                 return;
 418         case 1:
 419                 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
 420                 return;
 421         }
 422 }
 423
 424 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
 425         unsigned * fraglist, int cnt)
 426 {
 427         struct ufs_sb_private_info * uspi;
 428         unsigned fragsize, pos;
 429         unsigned swab;
 430
 431         swab = sb->u.ufs_sb.s_swab;
 432         uspi = sb->u.ufs_sb.s_uspi;
 433
 434         fragsize = 0;
 435         for (pos = 0; pos < uspi->s_fpb; pos++) {
 436                 if (blockmap & (1 << pos)) {
 437                         fragsize++;
 438                 }
 439                 else if (fragsize > 0) {
 440                         ADD_SWAB32(fraglist[fragsize], cnt);
 441                         fragsize = 0;
 442                 }
 443         }
 444         if (fragsize > 0 && fragsize < uspi->s_fpb)
 445                 ADD_SWAB32(fraglist[fragsize], cnt);
 446 }
 447
 448 #define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
 449 static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 450         unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
 451 {
 452         unsigned rest, offset;
 453         unsigned char * cp;
 454
 455
 456         offset = begin & ~uspi->s_fmask;
 457         begin >>= uspi->s_fshift;
 458         for (;;) {
 459                 if ((offset + size) < uspi->s_fsize)
 460                         rest = size;
 461                 else
 462                         rest = uspi->s_fsize - offset;
 463                 size -= rest;
 464                 cp = ubh->bh[begin]->b_data + offset;
 465                 while ((table[*cp++] & mask) == 0 && --rest);
 466                 if (rest || !size)
 467                         break;
 468                 begin++;
 469                 offset = 0;
 470         }
 471         return (size + rest);
 472 }